| // SPDX-License-Identifier: GPL-2.0 |
| |
| #include <linux/bitmap.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <linux/spinlock.h> |
| #include <linux/list.h> |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/gpio.h> |
| #include <linux/idr.h> |
| #include <linux/slab.h> |
| #include <linux/acpi.h> |
| #include <linux/gpio/driver.h> |
| #include <linux/gpio/machine.h> |
| #include <linux/pinctrl/consumer.h> |
| #include <linux/fs.h> |
| #include <linux/compat.h> |
| #include <linux/file.h> |
| #include <uapi/linux/gpio.h> |
| |
| #include "gpiolib.h" |
| #include "gpiolib-of.h" |
| #include "gpiolib-acpi.h" |
| #include "gpiolib-cdev.h" |
| #include "gpiolib-sysfs.h" |
| |
| #define CREATE_TRACE_POINTS |
| #include <trace/events/gpio.h> |
| |
| /* Implementation infrastructure for GPIO interfaces. |
| * |
| * The GPIO programming interface allows for inlining speed-critical |
| * get/set operations for common cases, so that access to SOC-integrated |
| * GPIOs can sometimes cost only an instruction or two per bit. |
| */ |
| |
| |
| /* When debugging, extend minimal trust to callers and platform code. |
| * Also emit diagnostic messages that may help initial bringup, when |
| * board setup or driver bugs are most common. |
| * |
| * Otherwise, minimize overhead in what may be bitbanging codepaths. |
| */ |
| #ifdef DEBUG |
| #define extra_checks 1 |
| #else |
| #define extra_checks 0 |
| #endif |
| |
| /* Device and char device-related information */ |
| static DEFINE_IDA(gpio_ida); |
| static dev_t gpio_devt; |
| #define GPIO_DEV_MAX 256 /* 256 GPIO chip devices supported */ |
| static int gpio_bus_match(struct device *dev, struct device_driver *drv); |
| static struct bus_type gpio_bus_type = { |
| .name = "gpio", |
| .match = gpio_bus_match, |
| }; |
| |
| /* |
| * Number of GPIOs to use for the fast path in set array |
| */ |
| #define FASTPATH_NGPIO CONFIG_GPIOLIB_FASTPATH_LIMIT |
| |
| /* gpio_lock prevents conflicts during gpio_desc[] table updates. |
| * While any GPIO is requested, its gpio_chip is not removable; |
| * each GPIO's "requested" flag serves as a lock and refcount. |
| */ |
| DEFINE_SPINLOCK(gpio_lock); |
| |
| static DEFINE_MUTEX(gpio_lookup_lock); |
| static LIST_HEAD(gpio_lookup_list); |
| LIST_HEAD(gpio_devices); |
| |
| static DEFINE_MUTEX(gpio_machine_hogs_mutex); |
| static LIST_HEAD(gpio_machine_hogs); |
| |
| static void gpiochip_free_hogs(struct gpio_chip *gc); |
| static int gpiochip_add_irqchip(struct gpio_chip *gc, |
| struct lock_class_key *lock_key, |
| struct lock_class_key *request_key); |
| static void gpiochip_irqchip_remove(struct gpio_chip *gc); |
| static int gpiochip_irqchip_init_hw(struct gpio_chip *gc); |
| static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gc); |
| static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc); |
| |
| static bool gpiolib_initialized; |
| |
| static inline void desc_set_label(struct gpio_desc *d, const char *label) |
| { |
| d->label = label; |
| } |
| |
| /** |
| * gpio_to_desc - Convert a GPIO number to its descriptor |
| * @gpio: global GPIO number |
| * |
| * Returns: |
| * The GPIO descriptor associated with the given GPIO, or %NULL if no GPIO |
| * with the given number exists in the system. |
| */ |
| struct gpio_desc *gpio_to_desc(unsigned gpio) |
| { |
| struct gpio_device *gdev; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| list_for_each_entry(gdev, &gpio_devices, list) { |
| if (gdev->base <= gpio && |
| gdev->base + gdev->ngpio > gpio) { |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| return &gdev->descs[gpio - gdev->base]; |
| } |
| } |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| |
| if (!gpio_is_valid(gpio)) |
| pr_warn("invalid GPIO %d\n", gpio); |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(gpio_to_desc); |
| |
| /** |
| * gpiochip_get_desc - get the GPIO descriptor corresponding to the given |
| * hardware number for this chip |
| * @gc: GPIO chip |
| * @hwnum: hardware number of the GPIO for this chip |
| * |
| * Returns: |
| * A pointer to the GPIO descriptor or ``ERR_PTR(-EINVAL)`` if no GPIO exists |
| * in the given chip for the specified hardware number. |
| */ |
| struct gpio_desc *gpiochip_get_desc(struct gpio_chip *gc, |
| unsigned int hwnum) |
| { |
| struct gpio_device *gdev = gc->gpiodev; |
| |
| if (hwnum >= gdev->ngpio) |
| return ERR_PTR(-EINVAL); |
| |
| return &gdev->descs[hwnum]; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_get_desc); |
| |
| /** |
| * desc_to_gpio - convert a GPIO descriptor to the integer namespace |
| * @desc: GPIO descriptor |
| * |
| * This should disappear in the future but is needed since we still |
| * use GPIO numbers for error messages and sysfs nodes. |
| * |
| * Returns: |
| * The global GPIO number for the GPIO specified by its descriptor. |
| */ |
| int desc_to_gpio(const struct gpio_desc *desc) |
| { |
| return desc->gdev->base + (desc - &desc->gdev->descs[0]); |
| } |
| EXPORT_SYMBOL_GPL(desc_to_gpio); |
| |
| |
| /** |
| * gpiod_to_chip - Return the GPIO chip to which a GPIO descriptor belongs |
| * @desc: descriptor to return the chip of |
| */ |
| struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc) |
| { |
| if (!desc || !desc->gdev) |
| return NULL; |
| return desc->gdev->chip; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_to_chip); |
| |
| /* dynamic allocation of GPIOs, e.g. on a hotplugged device */ |
| static int gpiochip_find_base(int ngpio) |
| { |
| struct gpio_device *gdev; |
| int base = ARCH_NR_GPIOS - ngpio; |
| |
| list_for_each_entry_reverse(gdev, &gpio_devices, list) { |
| /* found a free space? */ |
| if (gdev->base + gdev->ngpio <= base) |
| break; |
| else |
| /* nope, check the space right before the chip */ |
| base = gdev->base - ngpio; |
| } |
| |
| if (gpio_is_valid(base)) { |
| pr_debug("%s: found new base at %d\n", __func__, base); |
| return base; |
| } else { |
| pr_err("%s: cannot find free range\n", __func__); |
| return -ENOSPC; |
| } |
| } |
| |
| /** |
| * gpiod_get_direction - return the current direction of a GPIO |
| * @desc: GPIO to get the direction of |
| * |
| * Returns 0 for output, 1 for input, or an error code in case of error. |
| * |
| * This function may sleep if gpiod_cansleep() is true. |
| */ |
| int gpiod_get_direction(struct gpio_desc *desc) |
| { |
| struct gpio_chip *gc; |
| unsigned int offset; |
| int ret; |
| |
| gc = gpiod_to_chip(desc); |
| offset = gpio_chip_hwgpio(desc); |
| |
| /* |
| * Open drain emulation using input mode may incorrectly report |
| * input here, fix that up. |
| */ |
| if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && |
| test_bit(FLAG_IS_OUT, &desc->flags)) |
| return 0; |
| |
| if (!gc->get_direction) |
| return -ENOTSUPP; |
| |
| ret = gc->get_direction(gc, offset); |
| if (ret < 0) |
| return ret; |
| |
| /* GPIOF_DIR_IN or other positive, otherwise GPIOF_DIR_OUT */ |
| if (ret > 0) |
| ret = 1; |
| |
| assign_bit(FLAG_IS_OUT, &desc->flags, !ret); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_direction); |
| |
| /* |
| * Add a new chip to the global chips list, keeping the list of chips sorted |
| * by range(means [base, base + ngpio - 1]) order. |
| * |
| * Return -EBUSY if the new chip overlaps with some other chip's integer |
| * space. |
| */ |
| static int gpiodev_add_to_list(struct gpio_device *gdev) |
| { |
| struct gpio_device *prev, *next; |
| |
| if (list_empty(&gpio_devices)) { |
| /* initial entry in list */ |
| list_add_tail(&gdev->list, &gpio_devices); |
| return 0; |
| } |
| |
| next = list_entry(gpio_devices.next, struct gpio_device, list); |
| if (gdev->base + gdev->ngpio <= next->base) { |
| /* add before first entry */ |
| list_add(&gdev->list, &gpio_devices); |
| return 0; |
| } |
| |
| prev = list_entry(gpio_devices.prev, struct gpio_device, list); |
| if (prev->base + prev->ngpio <= gdev->base) { |
| /* add behind last entry */ |
| list_add_tail(&gdev->list, &gpio_devices); |
| return 0; |
| } |
| |
| list_for_each_entry_safe(prev, next, &gpio_devices, list) { |
| /* at the end of the list */ |
| if (&next->list == &gpio_devices) |
| break; |
| |
| /* add between prev and next */ |
| if (prev->base + prev->ngpio <= gdev->base |
| && gdev->base + gdev->ngpio <= next->base) { |
| list_add(&gdev->list, &prev->list); |
| return 0; |
| } |
| } |
| |
| dev_err(&gdev->dev, "GPIO integer space overlap, cannot add chip\n"); |
| return -EBUSY; |
| } |
| |
| /* |
| * Convert a GPIO name to its descriptor |
| * Note that there is no guarantee that GPIO names are globally unique! |
| * Hence this function will return, if it exists, a reference to the first GPIO |
| * line found that matches the given name. |
| */ |
| static struct gpio_desc *gpio_name_to_desc(const char * const name) |
| { |
| struct gpio_device *gdev; |
| unsigned long flags; |
| |
| if (!name) |
| return NULL; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| list_for_each_entry(gdev, &gpio_devices, list) { |
| int i; |
| |
| for (i = 0; i != gdev->ngpio; ++i) { |
| struct gpio_desc *desc = &gdev->descs[i]; |
| |
| if (!desc->name) |
| continue; |
| |
| if (!strcmp(desc->name, name)) { |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| return desc; |
| } |
| } |
| } |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| |
| return NULL; |
| } |
| |
| /* |
| * Take the names from gc->names and assign them to their GPIO descriptors. |
| * Warn if a name is already used for a GPIO line on a different GPIO chip. |
| * |
| * Note that: |
| * 1. Non-unique names are still accepted, |
| * 2. Name collisions within the same GPIO chip are not reported. |
| */ |
| static int gpiochip_set_desc_names(struct gpio_chip *gc) |
| { |
| struct gpio_device *gdev = gc->gpiodev; |
| int i; |
| |
| /* First check all names if they are unique */ |
| for (i = 0; i != gc->ngpio; ++i) { |
| struct gpio_desc *gpio; |
| |
| gpio = gpio_name_to_desc(gc->names[i]); |
| if (gpio) |
| dev_warn(&gdev->dev, |
| "Detected name collision for GPIO name '%s'\n", |
| gc->names[i]); |
| } |
| |
| /* Then add all names to the GPIO descriptors */ |
| for (i = 0; i != gc->ngpio; ++i) |
| gdev->descs[i].name = gc->names[i]; |
| |
| return 0; |
| } |
| |
| /* |
| * devprop_gpiochip_set_names - Set GPIO line names using device properties |
| * @chip: GPIO chip whose lines should be named, if possible |
| * |
| * Looks for device property "gpio-line-names" and if it exists assigns |
| * GPIO line names for the chip. The memory allocated for the assigned |
| * names belong to the underlying firmware node and should not be released |
| * by the caller. |
| */ |
| static int devprop_gpiochip_set_names(struct gpio_chip *chip) |
| { |
| struct gpio_device *gdev = chip->gpiodev; |
| struct fwnode_handle *fwnode = dev_fwnode(&gdev->dev); |
| const char **names; |
| int ret, i; |
| int count; |
| |
| count = fwnode_property_string_array_count(fwnode, "gpio-line-names"); |
| if (count < 0) |
| return 0; |
| |
| /* |
| * When offset is set in the driver side we assume the driver internally |
| * is using more than one gpiochip per the same device. We have to stop |
| * setting friendly names if the specified ones with 'gpio-line-names' |
| * are less than the offset in the device itself. This means all the |
| * lines are not present for every single pin within all the internal |
| * gpiochips. |
| */ |
| if (count <= chip->offset) { |
| dev_warn(&gdev->dev, "gpio-line-names too short (length %d), cannot map names for the gpiochip at offset %u\n", |
| count, chip->offset); |
| return 0; |
| } |
| |
| names = kcalloc(count, sizeof(*names), GFP_KERNEL); |
| if (!names) |
| return -ENOMEM; |
| |
| ret = fwnode_property_read_string_array(fwnode, "gpio-line-names", |
| names, count); |
| if (ret < 0) { |
| dev_warn(&gdev->dev, "failed to read GPIO line names\n"); |
| kfree(names); |
| return ret; |
| } |
| |
| /* |
| * When more that one gpiochip per device is used, 'count' can |
| * contain at most number gpiochips x chip->ngpio. We have to |
| * correctly distribute all defined lines taking into account |
| * chip->offset as starting point from where we will assign |
| * the names to pins from the 'names' array. Since property |
| * 'gpio-line-names' cannot contains gaps, we have to be sure |
| * we only assign those pins that really exists since chip->ngpio |
| * can be different of the chip->offset. |
| */ |
| count = (count > chip->offset) ? count - chip->offset : count; |
| if (count > chip->ngpio) |
| count = chip->ngpio; |
| |
| for (i = 0; i < count; i++) { |
| /* |
| * Allow overriding "fixed" names provided by the GPIO |
| * provider. The "fixed" names are more often than not |
| * generic and less informative than the names given in |
| * device properties. |
| */ |
| if (names[chip->offset + i] && names[chip->offset + i][0]) |
| gdev->descs[i].name = names[chip->offset + i]; |
| } |
| |
| kfree(names); |
| |
| return 0; |
| } |
| |
| static unsigned long *gpiochip_allocate_mask(struct gpio_chip *gc) |
| { |
| unsigned long *p; |
| |
| p = bitmap_alloc(gc->ngpio, GFP_KERNEL); |
| if (!p) |
| return NULL; |
| |
| /* Assume by default all GPIOs are valid */ |
| bitmap_fill(p, gc->ngpio); |
| |
| return p; |
| } |
| |
| static int gpiochip_alloc_valid_mask(struct gpio_chip *gc) |
| { |
| if (!(of_gpio_need_valid_mask(gc) || gc->init_valid_mask)) |
| return 0; |
| |
| gc->valid_mask = gpiochip_allocate_mask(gc); |
| if (!gc->valid_mask) |
| return -ENOMEM; |
| |
| return 0; |
| } |
| |
| static int gpiochip_init_valid_mask(struct gpio_chip *gc) |
| { |
| if (gc->init_valid_mask) |
| return gc->init_valid_mask(gc, |
| gc->valid_mask, |
| gc->ngpio); |
| |
| return 0; |
| } |
| |
| static void gpiochip_free_valid_mask(struct gpio_chip *gc) |
| { |
| bitmap_free(gc->valid_mask); |
| gc->valid_mask = NULL; |
| } |
| |
| static int gpiochip_add_pin_ranges(struct gpio_chip *gc) |
| { |
| if (gc->add_pin_ranges) |
| return gc->add_pin_ranges(gc); |
| |
| return 0; |
| } |
| |
| bool gpiochip_line_is_valid(const struct gpio_chip *gc, |
| unsigned int offset) |
| { |
| /* No mask means all valid */ |
| if (likely(!gc->valid_mask)) |
| return true; |
| return test_bit(offset, gc->valid_mask); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_line_is_valid); |
| |
| static void gpiodevice_release(struct device *dev) |
| { |
| struct gpio_device *gdev = container_of(dev, struct gpio_device, dev); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| list_del(&gdev->list); |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| |
| ida_free(&gpio_ida, gdev->id); |
| kfree_const(gdev->label); |
| kfree(gdev->descs); |
| kfree(gdev); |
| } |
| |
| #ifdef CONFIG_GPIO_CDEV |
| #define gcdev_register(gdev, devt) gpiolib_cdev_register((gdev), (devt)) |
| #define gcdev_unregister(gdev) gpiolib_cdev_unregister((gdev)) |
| #else |
| /* |
| * gpiolib_cdev_register() indirectly calls device_add(), which is still |
| * required even when cdev is not selected. |
| */ |
| #define gcdev_register(gdev, devt) device_add(&(gdev)->dev) |
| #define gcdev_unregister(gdev) device_del(&(gdev)->dev) |
| #endif |
| |
| static int gpiochip_setup_dev(struct gpio_device *gdev) |
| { |
| int ret; |
| |
| ret = gcdev_register(gdev, gpio_devt); |
| if (ret) |
| return ret; |
| |
| ret = gpiochip_sysfs_register(gdev); |
| if (ret) |
| goto err_remove_device; |
| |
| /* From this point, the .release() function cleans up gpio_device */ |
| gdev->dev.release = gpiodevice_release; |
| dev_dbg(&gdev->dev, "registered GPIOs %d to %d on %s\n", gdev->base, |
| gdev->base + gdev->ngpio - 1, gdev->chip->label ? : "generic"); |
| |
| return 0; |
| |
| err_remove_device: |
| gcdev_unregister(gdev); |
| return ret; |
| } |
| |
| static void gpiochip_machine_hog(struct gpio_chip *gc, struct gpiod_hog *hog) |
| { |
| struct gpio_desc *desc; |
| int rv; |
| |
| desc = gpiochip_get_desc(gc, hog->chip_hwnum); |
| if (IS_ERR(desc)) { |
| chip_err(gc, "%s: unable to get GPIO desc: %ld\n", __func__, |
| PTR_ERR(desc)); |
| return; |
| } |
| |
| if (test_bit(FLAG_IS_HOGGED, &desc->flags)) |
| return; |
| |
| rv = gpiod_hog(desc, hog->line_name, hog->lflags, hog->dflags); |
| if (rv) |
| gpiod_err(desc, "%s: unable to hog GPIO line (%s:%u): %d\n", |
| __func__, gc->label, hog->chip_hwnum, rv); |
| } |
| |
| static void machine_gpiochip_add(struct gpio_chip *gc) |
| { |
| struct gpiod_hog *hog; |
| |
| mutex_lock(&gpio_machine_hogs_mutex); |
| |
| list_for_each_entry(hog, &gpio_machine_hogs, list) { |
| if (!strcmp(gc->label, hog->chip_label)) |
| gpiochip_machine_hog(gc, hog); |
| } |
| |
| mutex_unlock(&gpio_machine_hogs_mutex); |
| } |
| |
| static void gpiochip_setup_devs(void) |
| { |
| struct gpio_device *gdev; |
| int ret; |
| |
| list_for_each_entry(gdev, &gpio_devices, list) { |
| ret = gpiochip_setup_dev(gdev); |
| if (ret) |
| dev_err(&gdev->dev, |
| "Failed to initialize gpio device (%d)\n", ret); |
| } |
| } |
| |
| int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data, |
| struct lock_class_key *lock_key, |
| struct lock_class_key *request_key) |
| { |
| struct fwnode_handle *fwnode = NULL; |
| struct gpio_device *gdev; |
| unsigned long flags; |
| int base = gc->base; |
| unsigned int i; |
| int ret = 0; |
| u32 ngpios; |
| |
| if (gc->fwnode) |
| fwnode = gc->fwnode; |
| else if (gc->parent) |
| fwnode = dev_fwnode(gc->parent); |
| |
| /* |
| * First: allocate and populate the internal stat container, and |
| * set up the struct device. |
| */ |
| gdev = kzalloc(sizeof(*gdev), GFP_KERNEL); |
| if (!gdev) |
| return -ENOMEM; |
| gdev->dev.bus = &gpio_bus_type; |
| gdev->dev.parent = gc->parent; |
| gdev->chip = gc; |
| gc->gpiodev = gdev; |
| |
| of_gpio_dev_init(gc, gdev); |
| acpi_gpio_dev_init(gc, gdev); |
| |
| /* |
| * Assign fwnode depending on the result of the previous calls, |
| * if none of them succeed, assign it to the parent's one. |
| */ |
| gdev->dev.fwnode = dev_fwnode(&gdev->dev) ?: fwnode; |
| |
| gdev->id = ida_alloc(&gpio_ida, GFP_KERNEL); |
| if (gdev->id < 0) { |
| ret = gdev->id; |
| goto err_free_gdev; |
| } |
| |
| ret = dev_set_name(&gdev->dev, GPIOCHIP_NAME "%d", gdev->id); |
| if (ret) |
| goto err_free_ida; |
| |
| device_initialize(&gdev->dev); |
| if (gc->parent && gc->parent->driver) |
| gdev->owner = gc->parent->driver->owner; |
| else if (gc->owner) |
| /* TODO: remove chip->owner */ |
| gdev->owner = gc->owner; |
| else |
| gdev->owner = THIS_MODULE; |
| |
| gdev->descs = kcalloc(gc->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL); |
| if (!gdev->descs) { |
| ret = -ENOMEM; |
| goto err_free_dev_name; |
| } |
| |
| /* |
| * Try the device properties if the driver didn't supply the number |
| * of GPIO lines. |
| */ |
| if (gc->ngpio == 0) { |
| ret = device_property_read_u32(&gdev->dev, "ngpios", &ngpios); |
| if (ret == -ENODATA) |
| /* |
| * -ENODATA means that there is no property found and |
| * we want to issue the error message to the user. |
| * Besides that, we want to return different error code |
| * to state that supplied value is not valid. |
| */ |
| ngpios = 0; |
| else if (ret) |
| goto err_free_descs; |
| |
| gc->ngpio = ngpios; |
| } |
| |
| if (gc->ngpio == 0) { |
| chip_err(gc, "tried to insert a GPIO chip with zero lines\n"); |
| ret = -EINVAL; |
| goto err_free_descs; |
| } |
| |
| if (gc->ngpio > FASTPATH_NGPIO) |
| chip_warn(gc, "line cnt %u is greater than fast path cnt %u\n", |
| gc->ngpio, FASTPATH_NGPIO); |
| |
| gdev->label = kstrdup_const(gc->label ?: "unknown", GFP_KERNEL); |
| if (!gdev->label) { |
| ret = -ENOMEM; |
| goto err_free_descs; |
| } |
| |
| gdev->ngpio = gc->ngpio; |
| gdev->data = data; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| /* |
| * TODO: this allocates a Linux GPIO number base in the global |
| * GPIO numberspace for this chip. In the long run we want to |
| * get *rid* of this numberspace and use only descriptors, but |
| * it may be a pipe dream. It will not happen before we get rid |
| * of the sysfs interface anyways. |
| */ |
| if (base < 0) { |
| base = gpiochip_find_base(gc->ngpio); |
| if (base < 0) { |
| ret = base; |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| goto err_free_label; |
| } |
| /* |
| * TODO: it should not be necessary to reflect the assigned |
| * base outside of the GPIO subsystem. Go over drivers and |
| * see if anyone makes use of this, else drop this and assign |
| * a poison instead. |
| */ |
| gc->base = base; |
| } |
| gdev->base = base; |
| |
| ret = gpiodev_add_to_list(gdev); |
| if (ret) { |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| goto err_free_label; |
| } |
| |
| for (i = 0; i < gc->ngpio; i++) |
| gdev->descs[i].gdev = gdev; |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| |
| BLOCKING_INIT_NOTIFIER_HEAD(&gdev->notifier); |
| |
| #ifdef CONFIG_PINCTRL |
| INIT_LIST_HEAD(&gdev->pin_ranges); |
| #endif |
| |
| if (gc->names) { |
| ret = gpiochip_set_desc_names(gc); |
| if (ret) |
| goto err_remove_from_list; |
| } |
| ret = devprop_gpiochip_set_names(gc); |
| if (ret) |
| goto err_remove_from_list; |
| |
| ret = gpiochip_alloc_valid_mask(gc); |
| if (ret) |
| goto err_remove_from_list; |
| |
| ret = of_gpiochip_add(gc); |
| if (ret) |
| goto err_free_gpiochip_mask; |
| |
| ret = gpiochip_init_valid_mask(gc); |
| if (ret) |
| goto err_remove_of_chip; |
| |
| for (i = 0; i < gc->ngpio; i++) { |
| struct gpio_desc *desc = &gdev->descs[i]; |
| |
| if (gc->get_direction && gpiochip_line_is_valid(gc, i)) { |
| assign_bit(FLAG_IS_OUT, |
| &desc->flags, !gc->get_direction(gc, i)); |
| } else { |
| assign_bit(FLAG_IS_OUT, |
| &desc->flags, !gc->direction_input); |
| } |
| } |
| |
| ret = gpiochip_add_pin_ranges(gc); |
| if (ret) |
| goto err_remove_of_chip; |
| |
| acpi_gpiochip_add(gc); |
| |
| machine_gpiochip_add(gc); |
| |
| ret = gpiochip_irqchip_init_valid_mask(gc); |
| if (ret) |
| goto err_remove_acpi_chip; |
| |
| ret = gpiochip_irqchip_init_hw(gc); |
| if (ret) |
| goto err_remove_acpi_chip; |
| |
| ret = gpiochip_add_irqchip(gc, lock_key, request_key); |
| if (ret) |
| goto err_remove_irqchip_mask; |
| |
| /* |
| * By first adding the chardev, and then adding the device, |
| * we get a device node entry in sysfs under |
| * /sys/bus/gpio/devices/gpiochipN/dev that can be used for |
| * coldplug of device nodes and other udev business. |
| * We can do this only if gpiolib has been initialized. |
| * Otherwise, defer until later. |
| */ |
| if (gpiolib_initialized) { |
| ret = gpiochip_setup_dev(gdev); |
| if (ret) |
| goto err_remove_irqchip; |
| } |
| return 0; |
| |
| err_remove_irqchip: |
| gpiochip_irqchip_remove(gc); |
| err_remove_irqchip_mask: |
| gpiochip_irqchip_free_valid_mask(gc); |
| err_remove_acpi_chip: |
| acpi_gpiochip_remove(gc); |
| err_remove_of_chip: |
| gpiochip_free_hogs(gc); |
| of_gpiochip_remove(gc); |
| err_free_gpiochip_mask: |
| gpiochip_remove_pin_ranges(gc); |
| gpiochip_free_valid_mask(gc); |
| err_remove_from_list: |
| spin_lock_irqsave(&gpio_lock, flags); |
| list_del(&gdev->list); |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| err_free_label: |
| kfree_const(gdev->label); |
| err_free_descs: |
| kfree(gdev->descs); |
| err_free_dev_name: |
| kfree(dev_name(&gdev->dev)); |
| err_free_ida: |
| ida_free(&gpio_ida, gdev->id); |
| err_free_gdev: |
| /* failures here can mean systems won't boot... */ |
| if (ret != -EPROBE_DEFER) { |
| pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__, |
| gdev->base, gdev->base + gdev->ngpio - 1, |
| gc->label ? : "generic", ret); |
| } |
| kfree(gdev); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_add_data_with_key); |
| |
| /** |
| * gpiochip_get_data() - get per-subdriver data for the chip |
| * @gc: GPIO chip |
| * |
| * Returns: |
| * The per-subdriver data for the chip. |
| */ |
| void *gpiochip_get_data(struct gpio_chip *gc) |
| { |
| return gc->gpiodev->data; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_get_data); |
| |
| /** |
| * gpiochip_remove() - unregister a gpio_chip |
| * @gc: the chip to unregister |
| * |
| * A gpio_chip with any GPIOs still requested may not be removed. |
| */ |
| void gpiochip_remove(struct gpio_chip *gc) |
| { |
| struct gpio_device *gdev = gc->gpiodev; |
| unsigned long flags; |
| unsigned int i; |
| |
| /* FIXME: should the legacy sysfs handling be moved to gpio_device? */ |
| gpiochip_sysfs_unregister(gdev); |
| gpiochip_free_hogs(gc); |
| /* Numb the device, cancelling all outstanding operations */ |
| gdev->chip = NULL; |
| gpiochip_irqchip_remove(gc); |
| acpi_gpiochip_remove(gc); |
| of_gpiochip_remove(gc); |
| gpiochip_remove_pin_ranges(gc); |
| gpiochip_free_valid_mask(gc); |
| /* |
| * We accept no more calls into the driver from this point, so |
| * NULL the driver data pointer |
| */ |
| gdev->data = NULL; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| for (i = 0; i < gdev->ngpio; i++) { |
| if (gpiochip_is_requested(gc, i)) |
| break; |
| } |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| |
| if (i != gdev->ngpio) |
| dev_crit(&gdev->dev, |
| "REMOVING GPIOCHIP WITH GPIOS STILL REQUESTED\n"); |
| |
| /* |
| * The gpiochip side puts its use of the device to rest here: |
| * if there are no userspace clients, the chardev and device will |
| * be removed, else it will be dangling until the last user is |
| * gone. |
| */ |
| gcdev_unregister(gdev); |
| put_device(&gdev->dev); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_remove); |
| |
| /** |
| * gpiochip_find() - iterator for locating a specific gpio_chip |
| * @data: data to pass to match function |
| * @match: Callback function to check gpio_chip |
| * |
| * Similar to bus_find_device. It returns a reference to a gpio_chip as |
| * determined by a user supplied @match callback. The callback should return |
| * 0 if the device doesn't match and non-zero if it does. If the callback is |
| * non-zero, this function will return to the caller and not iterate over any |
| * more gpio_chips. |
| */ |
| struct gpio_chip *gpiochip_find(void *data, |
| int (*match)(struct gpio_chip *gc, |
| void *data)) |
| { |
| struct gpio_device *gdev; |
| struct gpio_chip *gc = NULL; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| list_for_each_entry(gdev, &gpio_devices, list) |
| if (gdev->chip && match(gdev->chip, data)) { |
| gc = gdev->chip; |
| break; |
| } |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| |
| return gc; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_find); |
| |
| static int gpiochip_match_name(struct gpio_chip *gc, void *data) |
| { |
| const char *name = data; |
| |
| return !strcmp(gc->label, name); |
| } |
| |
| static struct gpio_chip *find_chip_by_name(const char *name) |
| { |
| return gpiochip_find((void *)name, gpiochip_match_name); |
| } |
| |
| #ifdef CONFIG_GPIOLIB_IRQCHIP |
| |
| /* |
| * The following is irqchip helper code for gpiochips. |
| */ |
| |
| static int gpiochip_irqchip_init_hw(struct gpio_chip *gc) |
| { |
| struct gpio_irq_chip *girq = &gc->irq; |
| |
| if (!girq->init_hw) |
| return 0; |
| |
| return girq->init_hw(gc); |
| } |
| |
| static int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gc) |
| { |
| struct gpio_irq_chip *girq = &gc->irq; |
| |
| if (!girq->init_valid_mask) |
| return 0; |
| |
| girq->valid_mask = gpiochip_allocate_mask(gc); |
| if (!girq->valid_mask) |
| return -ENOMEM; |
| |
| girq->init_valid_mask(gc, girq->valid_mask, gc->ngpio); |
| |
| return 0; |
| } |
| |
| static void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc) |
| { |
| bitmap_free(gc->irq.valid_mask); |
| gc->irq.valid_mask = NULL; |
| } |
| |
| bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gc, |
| unsigned int offset) |
| { |
| if (!gpiochip_line_is_valid(gc, offset)) |
| return false; |
| /* No mask means all valid */ |
| if (likely(!gc->irq.valid_mask)) |
| return true; |
| return test_bit(offset, gc->irq.valid_mask); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_irqchip_irq_valid); |
| |
| #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY |
| |
| /** |
| * gpiochip_set_hierarchical_irqchip() - connects a hierarchical irqchip |
| * to a gpiochip |
| * @gc: the gpiochip to set the irqchip hierarchical handler to |
| * @irqchip: the irqchip to handle this level of the hierarchy, the interrupt |
| * will then percolate up to the parent |
| */ |
| static void gpiochip_set_hierarchical_irqchip(struct gpio_chip *gc, |
| struct irq_chip *irqchip) |
| { |
| /* DT will deal with mapping each IRQ as we go along */ |
| if (is_of_node(gc->irq.fwnode)) |
| return; |
| |
| /* |
| * This is for legacy and boardfile "irqchip" fwnodes: allocate |
| * irqs upfront instead of dynamically since we don't have the |
| * dynamic type of allocation that hardware description languages |
| * provide. Once all GPIO drivers using board files are gone from |
| * the kernel we can delete this code, but for a transitional period |
| * it is necessary to keep this around. |
| */ |
| if (is_fwnode_irqchip(gc->irq.fwnode)) { |
| int i; |
| int ret; |
| |
| for (i = 0; i < gc->ngpio; i++) { |
| struct irq_fwspec fwspec; |
| unsigned int parent_hwirq; |
| unsigned int parent_type; |
| struct gpio_irq_chip *girq = &gc->irq; |
| |
| /* |
| * We call the child to parent translation function |
| * only to check if the child IRQ is valid or not. |
| * Just pick the rising edge type here as that is what |
| * we likely need to support. |
| */ |
| ret = girq->child_to_parent_hwirq(gc, i, |
| IRQ_TYPE_EDGE_RISING, |
| &parent_hwirq, |
| &parent_type); |
| if (ret) { |
| chip_err(gc, "skip set-up on hwirq %d\n", |
| i); |
| continue; |
| } |
| |
| fwspec.fwnode = gc->irq.fwnode; |
| /* This is the hwirq for the GPIO line side of things */ |
| fwspec.param[0] = girq->child_offset_to_irq(gc, i); |
| /* Just pick something */ |
| fwspec.param[1] = IRQ_TYPE_EDGE_RISING; |
| fwspec.param_count = 2; |
| ret = __irq_domain_alloc_irqs(gc->irq.domain, |
| /* just pick something */ |
| -1, |
| 1, |
| NUMA_NO_NODE, |
| &fwspec, |
| false, |
| NULL); |
| if (ret < 0) { |
| chip_err(gc, |
| "can not allocate irq for GPIO line %d parent hwirq %d in hierarchy domain: %d\n", |
| i, parent_hwirq, |
| ret); |
| } |
| } |
| } |
| |
| chip_err(gc, "%s unknown fwnode type proceed anyway\n", __func__); |
| |
| return; |
| } |
| |
| static int gpiochip_hierarchy_irq_domain_translate(struct irq_domain *d, |
| struct irq_fwspec *fwspec, |
| unsigned long *hwirq, |
| unsigned int *type) |
| { |
| /* We support standard DT translation */ |
| if (is_of_node(fwspec->fwnode) && fwspec->param_count == 2) { |
| return irq_domain_translate_twocell(d, fwspec, hwirq, type); |
| } |
| |
| /* This is for board files and others not using DT */ |
| if (is_fwnode_irqchip(fwspec->fwnode)) { |
| int ret; |
| |
| ret = irq_domain_translate_twocell(d, fwspec, hwirq, type); |
| if (ret) |
| return ret; |
| WARN_ON(*type == IRQ_TYPE_NONE); |
| return 0; |
| } |
| return -EINVAL; |
| } |
| |
| static int gpiochip_hierarchy_irq_domain_alloc(struct irq_domain *d, |
| unsigned int irq, |
| unsigned int nr_irqs, |
| void *data) |
| { |
| struct gpio_chip *gc = d->host_data; |
| irq_hw_number_t hwirq; |
| unsigned int type = IRQ_TYPE_NONE; |
| struct irq_fwspec *fwspec = data; |
| void *parent_arg; |
| unsigned int parent_hwirq; |
| unsigned int parent_type; |
| struct gpio_irq_chip *girq = &gc->irq; |
| int ret; |
| |
| /* |
| * The nr_irqs parameter is always one except for PCI multi-MSI |
| * so this should not happen. |
| */ |
| WARN_ON(nr_irqs != 1); |
| |
| ret = gc->irq.child_irq_domain_ops.translate(d, fwspec, &hwirq, &type); |
| if (ret) |
| return ret; |
| |
| chip_dbg(gc, "allocate IRQ %d, hwirq %lu\n", irq, hwirq); |
| |
| ret = girq->child_to_parent_hwirq(gc, hwirq, type, |
| &parent_hwirq, &parent_type); |
| if (ret) { |
| chip_err(gc, "can't look up hwirq %lu\n", hwirq); |
| return ret; |
| } |
| chip_dbg(gc, "found parent hwirq %u\n", parent_hwirq); |
| |
| /* |
| * We set handle_bad_irq because the .set_type() should |
| * always be invoked and set the right type of handler. |
| */ |
| irq_domain_set_info(d, |
| irq, |
| hwirq, |
| gc->irq.chip, |
| gc, |
| girq->handler, |
| NULL, NULL); |
| irq_set_probe(irq); |
| |
| /* This parent only handles asserted level IRQs */ |
| parent_arg = girq->populate_parent_alloc_arg(gc, parent_hwirq, parent_type); |
| if (!parent_arg) |
| return -ENOMEM; |
| |
| chip_dbg(gc, "alloc_irqs_parent for %d parent hwirq %d\n", |
| irq, parent_hwirq); |
| irq_set_lockdep_class(irq, gc->irq.lock_key, gc->irq.request_key); |
| ret = irq_domain_alloc_irqs_parent(d, irq, 1, parent_arg); |
| /* |
| * If the parent irqdomain is msi, the interrupts have already |
| * been allocated, so the EEXIST is good. |
| */ |
| if (irq_domain_is_msi(d->parent) && (ret == -EEXIST)) |
| ret = 0; |
| if (ret) |
| chip_err(gc, |
| "failed to allocate parent hwirq %d for hwirq %lu\n", |
| parent_hwirq, hwirq); |
| |
| kfree(parent_arg); |
| return ret; |
| } |
| |
| static unsigned int gpiochip_child_offset_to_irq_noop(struct gpio_chip *gc, |
| unsigned int offset) |
| { |
| return offset; |
| } |
| |
| static void gpiochip_hierarchy_setup_domain_ops(struct irq_domain_ops *ops) |
| { |
| ops->activate = gpiochip_irq_domain_activate; |
| ops->deactivate = gpiochip_irq_domain_deactivate; |
| ops->alloc = gpiochip_hierarchy_irq_domain_alloc; |
| ops->free = irq_domain_free_irqs_common; |
| |
| /* |
| * We only allow overriding the translate() function for |
| * hierarchical chips, and this should only be done if the user |
| * really need something other than 1:1 translation. |
| */ |
| if (!ops->translate) |
| ops->translate = gpiochip_hierarchy_irq_domain_translate; |
| } |
| |
| static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc) |
| { |
| if (!gc->irq.child_to_parent_hwirq || |
| !gc->irq.fwnode) { |
| chip_err(gc, "missing irqdomain vital data\n"); |
| return -EINVAL; |
| } |
| |
| if (!gc->irq.child_offset_to_irq) |
| gc->irq.child_offset_to_irq = gpiochip_child_offset_to_irq_noop; |
| |
| if (!gc->irq.populate_parent_alloc_arg) |
| gc->irq.populate_parent_alloc_arg = |
| gpiochip_populate_parent_fwspec_twocell; |
| |
| gpiochip_hierarchy_setup_domain_ops(&gc->irq.child_irq_domain_ops); |
| |
| gc->irq.domain = irq_domain_create_hierarchy( |
| gc->irq.parent_domain, |
| 0, |
| gc->ngpio, |
| gc->irq.fwnode, |
| &gc->irq.child_irq_domain_ops, |
| gc); |
| |
| if (!gc->irq.domain) |
| return -ENOMEM; |
| |
| gpiochip_set_hierarchical_irqchip(gc, gc->irq.chip); |
| |
| return 0; |
| } |
| |
| static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc) |
| { |
| return !!gc->irq.parent_domain; |
| } |
| |
| void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc, |
| unsigned int parent_hwirq, |
| unsigned int parent_type) |
| { |
| struct irq_fwspec *fwspec; |
| |
| fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL); |
| if (!fwspec) |
| return NULL; |
| |
| fwspec->fwnode = gc->irq.parent_domain->fwnode; |
| fwspec->param_count = 2; |
| fwspec->param[0] = parent_hwirq; |
| fwspec->param[1] = parent_type; |
| |
| return fwspec; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_populate_parent_fwspec_twocell); |
| |
| void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc, |
| unsigned int parent_hwirq, |
| unsigned int parent_type) |
| { |
| struct irq_fwspec *fwspec; |
| |
| fwspec = kmalloc(sizeof(*fwspec), GFP_KERNEL); |
| if (!fwspec) |
| return NULL; |
| |
| fwspec->fwnode = gc->irq.parent_domain->fwnode; |
| fwspec->param_count = 4; |
| fwspec->param[0] = 0; |
| fwspec->param[1] = parent_hwirq; |
| fwspec->param[2] = 0; |
| fwspec->param[3] = parent_type; |
| |
| return fwspec; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_populate_parent_fwspec_fourcell); |
| |
| #else |
| |
| static int gpiochip_hierarchy_add_domain(struct gpio_chip *gc) |
| { |
| return -EINVAL; |
| } |
| |
| static bool gpiochip_hierarchy_is_hierarchical(struct gpio_chip *gc) |
| { |
| return false; |
| } |
| |
| #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */ |
| |
| /** |
| * gpiochip_irq_map() - maps an IRQ into a GPIO irqchip |
| * @d: the irqdomain used by this irqchip |
| * @irq: the global irq number used by this GPIO irqchip irq |
| * @hwirq: the local IRQ/GPIO line offset on this gpiochip |
| * |
| * This function will set up the mapping for a certain IRQ line on a |
| * gpiochip by assigning the gpiochip as chip data, and using the irqchip |
| * stored inside the gpiochip. |
| */ |
| int gpiochip_irq_map(struct irq_domain *d, unsigned int irq, |
| irq_hw_number_t hwirq) |
| { |
| struct gpio_chip *gc = d->host_data; |
| int ret = 0; |
| |
| if (!gpiochip_irqchip_irq_valid(gc, hwirq)) |
| return -ENXIO; |
| |
| irq_set_chip_data(irq, gc); |
| /* |
| * This lock class tells lockdep that GPIO irqs are in a different |
| * category than their parents, so it won't report false recursion. |
| */ |
| irq_set_lockdep_class(irq, gc->irq.lock_key, gc->irq.request_key); |
| irq_set_chip_and_handler(irq, gc->irq.chip, gc->irq.handler); |
| /* Chips that use nested thread handlers have them marked */ |
| if (gc->irq.threaded) |
| irq_set_nested_thread(irq, 1); |
| irq_set_noprobe(irq); |
| |
| if (gc->irq.num_parents == 1) |
| ret = irq_set_parent(irq, gc->irq.parents[0]); |
| else if (gc->irq.map) |
| ret = irq_set_parent(irq, gc->irq.map[hwirq]); |
| |
| if (ret < 0) |
| return ret; |
| |
| /* |
| * No set-up of the hardware will happen if IRQ_TYPE_NONE |
| * is passed as default type. |
| */ |
| if (gc->irq.default_type != IRQ_TYPE_NONE) |
| irq_set_irq_type(irq, gc->irq.default_type); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_irq_map); |
| |
| void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq) |
| { |
| struct gpio_chip *gc = d->host_data; |
| |
| if (gc->irq.threaded) |
| irq_set_nested_thread(irq, 0); |
| irq_set_chip_and_handler(irq, NULL, NULL); |
| irq_set_chip_data(irq, NULL); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_irq_unmap); |
| |
| static const struct irq_domain_ops gpiochip_domain_ops = { |
| .map = gpiochip_irq_map, |
| .unmap = gpiochip_irq_unmap, |
| /* Virtually all GPIO irqchips are twocell:ed */ |
| .xlate = irq_domain_xlate_twocell, |
| }; |
| |
| /* |
| * TODO: move these activate/deactivate in under the hierarchicial |
| * irqchip implementation as static once SPMI and SSBI (all external |
| * users) are phased over. |
| */ |
| /** |
| * gpiochip_irq_domain_activate() - Lock a GPIO to be used as an IRQ |
| * @domain: The IRQ domain used by this IRQ chip |
| * @data: Outermost irq_data associated with the IRQ |
| * @reserve: If set, only reserve an interrupt vector instead of assigning one |
| * |
| * This function is a wrapper that calls gpiochip_lock_as_irq() and is to be |
| * used as the activate function for the &struct irq_domain_ops. The host_data |
| * for the IRQ domain must be the &struct gpio_chip. |
| */ |
| int gpiochip_irq_domain_activate(struct irq_domain *domain, |
| struct irq_data *data, bool reserve) |
| { |
| struct gpio_chip *gc = domain->host_data; |
| |
| return gpiochip_lock_as_irq(gc, data->hwirq); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_irq_domain_activate); |
| |
| /** |
| * gpiochip_irq_domain_deactivate() - Unlock a GPIO used as an IRQ |
| * @domain: The IRQ domain used by this IRQ chip |
| * @data: Outermost irq_data associated with the IRQ |
| * |
| * This function is a wrapper that will call gpiochip_unlock_as_irq() and is to |
| * be used as the deactivate function for the &struct irq_domain_ops. The |
| * host_data for the IRQ domain must be the &struct gpio_chip. |
| */ |
| void gpiochip_irq_domain_deactivate(struct irq_domain *domain, |
| struct irq_data *data) |
| { |
| struct gpio_chip *gc = domain->host_data; |
| |
| return gpiochip_unlock_as_irq(gc, data->hwirq); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_irq_domain_deactivate); |
| |
| static int gpiochip_to_irq(struct gpio_chip *gc, unsigned int offset) |
| { |
| struct irq_domain *domain = gc->irq.domain; |
| |
| if (!gpiochip_irqchip_irq_valid(gc, offset)) |
| return -ENXIO; |
| |
| #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY |
| if (irq_domain_is_hierarchy(domain)) { |
| struct irq_fwspec spec; |
| |
| spec.fwnode = domain->fwnode; |
| spec.param_count = 2; |
| spec.param[0] = gc->irq.child_offset_to_irq(gc, offset); |
| spec.param[1] = IRQ_TYPE_NONE; |
| |
| return irq_create_fwspec_mapping(&spec); |
| } |
| #endif |
| |
| return irq_create_mapping(domain, offset); |
| } |
| |
| static int gpiochip_irq_reqres(struct irq_data *d) |
| { |
| struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
| |
| return gpiochip_reqres_irq(gc, d->hwirq); |
| } |
| |
| static void gpiochip_irq_relres(struct irq_data *d) |
| { |
| struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
| |
| gpiochip_relres_irq(gc, d->hwirq); |
| } |
| |
| static void gpiochip_irq_mask(struct irq_data *d) |
| { |
| struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
| |
| if (gc->irq.irq_mask) |
| gc->irq.irq_mask(d); |
| gpiochip_disable_irq(gc, d->hwirq); |
| } |
| |
| static void gpiochip_irq_unmask(struct irq_data *d) |
| { |
| struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
| |
| gpiochip_enable_irq(gc, d->hwirq); |
| if (gc->irq.irq_unmask) |
| gc->irq.irq_unmask(d); |
| } |
| |
| static void gpiochip_irq_enable(struct irq_data *d) |
| { |
| struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
| |
| gpiochip_enable_irq(gc, d->hwirq); |
| gc->irq.irq_enable(d); |
| } |
| |
| static void gpiochip_irq_disable(struct irq_data *d) |
| { |
| struct gpio_chip *gc = irq_data_get_irq_chip_data(d); |
| |
| gc->irq.irq_disable(d); |
| gpiochip_disable_irq(gc, d->hwirq); |
| } |
| |
| static void gpiochip_set_irq_hooks(struct gpio_chip *gc) |
| { |
| struct irq_chip *irqchip = gc->irq.chip; |
| |
| if (!irqchip->irq_request_resources && |
| !irqchip->irq_release_resources) { |
| irqchip->irq_request_resources = gpiochip_irq_reqres; |
| irqchip->irq_release_resources = gpiochip_irq_relres; |
| } |
| if (WARN_ON(gc->irq.irq_enable)) |
| return; |
| /* Check if the irqchip already has this hook... */ |
| if (irqchip->irq_enable == gpiochip_irq_enable || |
| irqchip->irq_mask == gpiochip_irq_mask) { |
| /* |
| * ...and if so, give a gentle warning that this is bad |
| * practice. |
| */ |
| chip_info(gc, |
| "detected irqchip that is shared with multiple gpiochips: please fix the driver.\n"); |
| return; |
| } |
| |
| if (irqchip->irq_disable) { |
| gc->irq.irq_disable = irqchip->irq_disable; |
| irqchip->irq_disable = gpiochip_irq_disable; |
| } else { |
| gc->irq.irq_mask = irqchip->irq_mask; |
| irqchip->irq_mask = gpiochip_irq_mask; |
| } |
| |
| if (irqchip->irq_enable) { |
| gc->irq.irq_enable = irqchip->irq_enable; |
| irqchip->irq_enable = gpiochip_irq_enable; |
| } else { |
| gc->irq.irq_unmask = irqchip->irq_unmask; |
| irqchip->irq_unmask = gpiochip_irq_unmask; |
| } |
| } |
| |
| /** |
| * gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip |
| * @gc: the GPIO chip to add the IRQ chip to |
| * @lock_key: lockdep class for IRQ lock |
| * @request_key: lockdep class for IRQ request |
| */ |
| static int gpiochip_add_irqchip(struct gpio_chip *gc, |
| struct lock_class_key *lock_key, |
| struct lock_class_key *request_key) |
| { |
| struct fwnode_handle *fwnode = dev_fwnode(&gc->gpiodev->dev); |
| struct irq_chip *irqchip = gc->irq.chip; |
| unsigned int type; |
| unsigned int i; |
| |
| if (!irqchip) |
| return 0; |
| |
| if (gc->irq.parent_handler && gc->can_sleep) { |
| chip_err(gc, "you cannot have chained interrupts on a chip that may sleep\n"); |
| return -EINVAL; |
| } |
| |
| type = gc->irq.default_type; |
| |
| /* |
| * Specifying a default trigger is a terrible idea if DT or ACPI is |
| * used to configure the interrupts, as you may end up with |
| * conflicting triggers. Tell the user, and reset to NONE. |
| */ |
| if (WARN(fwnode && type != IRQ_TYPE_NONE, |
| "%pfw: Ignoring %u default trigger\n", fwnode, type)) |
| type = IRQ_TYPE_NONE; |
| |
| if (gc->to_irq) |
| chip_warn(gc, "to_irq is redefined in %s and you shouldn't rely on it\n", __func__); |
| |
| gc->to_irq = gpiochip_to_irq; |
| gc->irq.default_type = type; |
| gc->irq.lock_key = lock_key; |
| gc->irq.request_key = request_key; |
| |
| /* If a parent irqdomain is provided, let's build a hierarchy */ |
| if (gpiochip_hierarchy_is_hierarchical(gc)) { |
| int ret = gpiochip_hierarchy_add_domain(gc); |
| if (ret) |
| return ret; |
| } else { |
| /* Some drivers provide custom irqdomain ops */ |
| gc->irq.domain = irq_domain_create_simple(fwnode, |
| gc->ngpio, |
| gc->irq.first, |
| gc->irq.domain_ops ?: &gpiochip_domain_ops, |
| gc); |
| if (!gc->irq.domain) |
| return -EINVAL; |
| } |
| |
| if (gc->irq.parent_handler) { |
| for (i = 0; i < gc->irq.num_parents; i++) { |
| void *data; |
| |
| if (gc->irq.per_parent_data) |
| data = gc->irq.parent_handler_data_array[i]; |
| else |
| data = gc->irq.parent_handler_data ?: gc; |
| |
| /* |
| * The parent IRQ chip is already using the chip_data |
| * for this IRQ chip, so our callbacks simply use the |
| * handler_data. |
| */ |
| irq_set_chained_handler_and_data(gc->irq.parents[i], |
| gc->irq.parent_handler, |
| data); |
| } |
| } |
| |
| gpiochip_set_irq_hooks(gc); |
| |
| acpi_gpiochip_request_interrupts(gc); |
| |
| return 0; |
| } |
| |
| /** |
| * gpiochip_irqchip_remove() - removes an irqchip added to a gpiochip |
| * @gc: the gpiochip to remove the irqchip from |
| * |
| * This is called only from gpiochip_remove() |
| */ |
| static void gpiochip_irqchip_remove(struct gpio_chip *gc) |
| { |
| struct irq_chip *irqchip = gc->irq.chip; |
| unsigned int offset; |
| |
| acpi_gpiochip_free_interrupts(gc); |
| |
| if (irqchip && gc->irq.parent_handler) { |
| struct gpio_irq_chip *irq = &gc->irq; |
| unsigned int i; |
| |
| for (i = 0; i < irq->num_parents; i++) |
| irq_set_chained_handler_and_data(irq->parents[i], |
| NULL, NULL); |
| } |
| |
| /* Remove all IRQ mappings and delete the domain */ |
| if (gc->irq.domain) { |
| unsigned int irq; |
| |
| for (offset = 0; offset < gc->ngpio; offset++) { |
| if (!gpiochip_irqchip_irq_valid(gc, offset)) |
| continue; |
| |
| irq = irq_find_mapping(gc->irq.domain, offset); |
| irq_dispose_mapping(irq); |
| } |
| |
| irq_domain_remove(gc->irq.domain); |
| } |
| |
| if (irqchip) { |
| if (irqchip->irq_request_resources == gpiochip_irq_reqres) { |
| irqchip->irq_request_resources = NULL; |
| irqchip->irq_release_resources = NULL; |
| } |
| if (irqchip->irq_enable == gpiochip_irq_enable) { |
| irqchip->irq_enable = gc->irq.irq_enable; |
| irqchip->irq_disable = gc->irq.irq_disable; |
| } |
| } |
| gc->irq.irq_enable = NULL; |
| gc->irq.irq_disable = NULL; |
| gc->irq.chip = NULL; |
| |
| gpiochip_irqchip_free_valid_mask(gc); |
| } |
| |
| /** |
| * gpiochip_irqchip_add_domain() - adds an irqdomain to a gpiochip |
| * @gc: the gpiochip to add the irqchip to |
| * @domain: the irqdomain to add to the gpiochip |
| * |
| * This function adds an IRQ domain to the gpiochip. |
| */ |
| int gpiochip_irqchip_add_domain(struct gpio_chip *gc, |
| struct irq_domain *domain) |
| { |
| if (!domain) |
| return -EINVAL; |
| |
| gc->to_irq = gpiochip_to_irq; |
| gc->irq.domain = domain; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_domain); |
| |
| #else /* CONFIG_GPIOLIB_IRQCHIP */ |
| |
| static inline int gpiochip_add_irqchip(struct gpio_chip *gc, |
| struct lock_class_key *lock_key, |
| struct lock_class_key *request_key) |
| { |
| return 0; |
| } |
| static void gpiochip_irqchip_remove(struct gpio_chip *gc) {} |
| |
| static inline int gpiochip_irqchip_init_hw(struct gpio_chip *gc) |
| { |
| return 0; |
| } |
| |
| static inline int gpiochip_irqchip_init_valid_mask(struct gpio_chip *gc) |
| { |
| return 0; |
| } |
| static inline void gpiochip_irqchip_free_valid_mask(struct gpio_chip *gc) |
| { } |
| |
| #endif /* CONFIG_GPIOLIB_IRQCHIP */ |
| |
| /** |
| * gpiochip_generic_request() - request the gpio function for a pin |
| * @gc: the gpiochip owning the GPIO |
| * @offset: the offset of the GPIO to request for GPIO function |
| */ |
| int gpiochip_generic_request(struct gpio_chip *gc, unsigned int offset) |
| { |
| #ifdef CONFIG_PINCTRL |
| if (list_empty(&gc->gpiodev->pin_ranges)) |
| return 0; |
| #endif |
| |
| return pinctrl_gpio_request(gc->gpiodev->base + offset); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_generic_request); |
| |
| /** |
| * gpiochip_generic_free() - free the gpio function from a pin |
| * @gc: the gpiochip to request the gpio function for |
| * @offset: the offset of the GPIO to free from GPIO function |
| */ |
| void gpiochip_generic_free(struct gpio_chip *gc, unsigned int offset) |
| { |
| #ifdef CONFIG_PINCTRL |
| if (list_empty(&gc->gpiodev->pin_ranges)) |
| return; |
| #endif |
| |
| pinctrl_gpio_free(gc->gpiodev->base + offset); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_generic_free); |
| |
| /** |
| * gpiochip_generic_config() - apply configuration for a pin |
| * @gc: the gpiochip owning the GPIO |
| * @offset: the offset of the GPIO to apply the configuration |
| * @config: the configuration to be applied |
| */ |
| int gpiochip_generic_config(struct gpio_chip *gc, unsigned int offset, |
| unsigned long config) |
| { |
| return pinctrl_gpio_set_config(gc->gpiodev->base + offset, config); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_generic_config); |
| |
| #ifdef CONFIG_PINCTRL |
| |
| /** |
| * gpiochip_add_pingroup_range() - add a range for GPIO <-> pin mapping |
| * @gc: the gpiochip to add the range for |
| * @pctldev: the pin controller to map to |
| * @gpio_offset: the start offset in the current gpio_chip number space |
| * @pin_group: name of the pin group inside the pin controller |
| * |
| * Calling this function directly from a DeviceTree-supported |
| * pinctrl driver is DEPRECATED. Please see Section 2.1 of |
| * Documentation/devicetree/bindings/gpio/gpio.txt on how to |
| * bind pinctrl and gpio drivers via the "gpio-ranges" property. |
| */ |
| int gpiochip_add_pingroup_range(struct gpio_chip *gc, |
| struct pinctrl_dev *pctldev, |
| unsigned int gpio_offset, const char *pin_group) |
| { |
| struct gpio_pin_range *pin_range; |
| struct gpio_device *gdev = gc->gpiodev; |
| int ret; |
| |
| pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
| if (!pin_range) { |
| chip_err(gc, "failed to allocate pin ranges\n"); |
| return -ENOMEM; |
| } |
| |
| /* Use local offset as range ID */ |
| pin_range->range.id = gpio_offset; |
| pin_range->range.gc = gc; |
| pin_range->range.name = gc->label; |
| pin_range->range.base = gdev->base + gpio_offset; |
| pin_range->pctldev = pctldev; |
| |
| ret = pinctrl_get_group_pins(pctldev, pin_group, |
| &pin_range->range.pins, |
| &pin_range->range.npins); |
| if (ret < 0) { |
| kfree(pin_range); |
| return ret; |
| } |
| |
| pinctrl_add_gpio_range(pctldev, &pin_range->range); |
| |
| chip_dbg(gc, "created GPIO range %d->%d ==> %s PINGRP %s\n", |
| gpio_offset, gpio_offset + pin_range->range.npins - 1, |
| pinctrl_dev_get_devname(pctldev), pin_group); |
| |
| list_add_tail(&pin_range->node, &gdev->pin_ranges); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_add_pingroup_range); |
| |
| /** |
| * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping |
| * @gc: the gpiochip to add the range for |
| * @pinctl_name: the dev_name() of the pin controller to map to |
| * @gpio_offset: the start offset in the current gpio_chip number space |
| * @pin_offset: the start offset in the pin controller number space |
| * @npins: the number of pins from the offset of each pin space (GPIO and |
| * pin controller) to accumulate in this range |
| * |
| * Returns: |
| * 0 on success, or a negative error-code on failure. |
| * |
| * Calling this function directly from a DeviceTree-supported |
| * pinctrl driver is DEPRECATED. Please see Section 2.1 of |
| * Documentation/devicetree/bindings/gpio/gpio.txt on how to |
| * bind pinctrl and gpio drivers via the "gpio-ranges" property. |
| */ |
| int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name, |
| unsigned int gpio_offset, unsigned int pin_offset, |
| unsigned int npins) |
| { |
| struct gpio_pin_range *pin_range; |
| struct gpio_device *gdev = gc->gpiodev; |
| int ret; |
| |
| pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); |
| if (!pin_range) { |
| chip_err(gc, "failed to allocate pin ranges\n"); |
| return -ENOMEM; |
| } |
| |
| /* Use local offset as range ID */ |
| pin_range->range.id = gpio_offset; |
| pin_range->range.gc = gc; |
| pin_range->range.name = gc->label; |
| pin_range->range.base = gdev->base + gpio_offset; |
| pin_range->range.pin_base = pin_offset; |
| pin_range->range.npins = npins; |
| pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, |
| &pin_range->range); |
| if (IS_ERR(pin_range->pctldev)) { |
| ret = PTR_ERR(pin_range->pctldev); |
| chip_err(gc, "could not create pin range\n"); |
| kfree(pin_range); |
| return ret; |
| } |
| chip_dbg(gc, "created GPIO range %d->%d ==> %s PIN %d->%d\n", |
| gpio_offset, gpio_offset + npins - 1, |
| pinctl_name, |
| pin_offset, pin_offset + npins - 1); |
| |
| list_add_tail(&pin_range->node, &gdev->pin_ranges); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); |
| |
| /** |
| * gpiochip_remove_pin_ranges() - remove all the GPIO <-> pin mappings |
| * @gc: the chip to remove all the mappings for |
| */ |
| void gpiochip_remove_pin_ranges(struct gpio_chip *gc) |
| { |
| struct gpio_pin_range *pin_range, *tmp; |
| struct gpio_device *gdev = gc->gpiodev; |
| |
| list_for_each_entry_safe(pin_range, tmp, &gdev->pin_ranges, node) { |
| list_del(&pin_range->node); |
| pinctrl_remove_gpio_range(pin_range->pctldev, |
| &pin_range->range); |
| kfree(pin_range); |
| } |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_remove_pin_ranges); |
| |
| #endif /* CONFIG_PINCTRL */ |
| |
| /* These "optional" allocation calls help prevent drivers from stomping |
| * on each other, and help provide better diagnostics in debugfs. |
| * They're called even less than the "set direction" calls. |
| */ |
| static int gpiod_request_commit(struct gpio_desc *desc, const char *label) |
| { |
| struct gpio_chip *gc = desc->gdev->chip; |
| int ret; |
| unsigned long flags; |
| unsigned offset; |
| |
| if (label) { |
| label = kstrdup_const(label, GFP_KERNEL); |
| if (!label) |
| return -ENOMEM; |
| } |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| /* NOTE: gpio_request() can be called in early boot, |
| * before IRQs are enabled, for non-sleeping (SOC) GPIOs. |
| */ |
| |
| if (test_and_set_bit(FLAG_REQUESTED, &desc->flags) == 0) { |
| desc_set_label(desc, label ? : "?"); |
| } else { |
| ret = -EBUSY; |
| goto out_free_unlock; |
| } |
| |
| if (gc->request) { |
| /* gc->request may sleep */ |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| offset = gpio_chip_hwgpio(desc); |
| if (gpiochip_line_is_valid(gc, offset)) |
| ret = gc->request(gc, offset); |
| else |
| ret = -EINVAL; |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| if (ret) { |
| desc_set_label(desc, NULL); |
| clear_bit(FLAG_REQUESTED, &desc->flags); |
| goto out_free_unlock; |
| } |
| } |
| if (gc->get_direction) { |
| /* gc->get_direction may sleep */ |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| gpiod_get_direction(desc); |
| spin_lock_irqsave(&gpio_lock, flags); |
| } |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| return 0; |
| |
| out_free_unlock: |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| kfree_const(label); |
| return ret; |
| } |
| |
| /* |
| * This descriptor validation needs to be inserted verbatim into each |
| * function taking a descriptor, so we need to use a preprocessor |
| * macro to avoid endless duplication. If the desc is NULL it is an |
| * optional GPIO and calls should just bail out. |
| */ |
| static int validate_desc(const struct gpio_desc *desc, const char *func) |
| { |
| if (!desc) |
| return 0; |
| if (IS_ERR(desc)) { |
| pr_warn("%s: invalid GPIO (errorpointer)\n", func); |
| return PTR_ERR(desc); |
| } |
| if (!desc->gdev) { |
| pr_warn("%s: invalid GPIO (no device)\n", func); |
| return -EINVAL; |
| } |
| if (!desc->gdev->chip) { |
| dev_warn(&desc->gdev->dev, |
| "%s: backing chip is gone\n", func); |
| return 0; |
| } |
| return 1; |
| } |
| |
| #define VALIDATE_DESC(desc) do { \ |
| int __valid = validate_desc(desc, __func__); \ |
| if (__valid <= 0) \ |
| return __valid; \ |
| } while (0) |
| |
| #define VALIDATE_DESC_VOID(desc) do { \ |
| int __valid = validate_desc(desc, __func__); \ |
| if (__valid <= 0) \ |
| return; \ |
| } while (0) |
| |
| int gpiod_request(struct gpio_desc *desc, const char *label) |
| { |
| int ret = -EPROBE_DEFER; |
| struct gpio_device *gdev; |
| |
| VALIDATE_DESC(desc); |
| gdev = desc->gdev; |
| |
| if (try_module_get(gdev->owner)) { |
| ret = gpiod_request_commit(desc, label); |
| if (ret) |
| module_put(gdev->owner); |
| else |
| get_device(&gdev->dev); |
| } |
| |
| if (ret) |
| gpiod_dbg(desc, "%s: status %d\n", __func__, ret); |
| |
| return ret; |
| } |
| |
| static bool gpiod_free_commit(struct gpio_desc *desc) |
| { |
| bool ret = false; |
| unsigned long flags; |
| struct gpio_chip *gc; |
| |
| might_sleep(); |
| |
| gpiod_unexport(desc); |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| |
| gc = desc->gdev->chip; |
| if (gc && test_bit(FLAG_REQUESTED, &desc->flags)) { |
| if (gc->free) { |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| might_sleep_if(gc->can_sleep); |
| gc->free(gc, gpio_chip_hwgpio(desc)); |
| spin_lock_irqsave(&gpio_lock, flags); |
| } |
| kfree_const(desc->label); |
| desc_set_label(desc, NULL); |
| clear_bit(FLAG_ACTIVE_LOW, &desc->flags); |
| clear_bit(FLAG_REQUESTED, &desc->flags); |
| clear_bit(FLAG_OPEN_DRAIN, &desc->flags); |
| clear_bit(FLAG_OPEN_SOURCE, &desc->flags); |
| clear_bit(FLAG_PULL_UP, &desc->flags); |
| clear_bit(FLAG_PULL_DOWN, &desc->flags); |
| clear_bit(FLAG_BIAS_DISABLE, &desc->flags); |
| clear_bit(FLAG_EDGE_RISING, &desc->flags); |
| clear_bit(FLAG_EDGE_FALLING, &desc->flags); |
| clear_bit(FLAG_IS_HOGGED, &desc->flags); |
| #ifdef CONFIG_OF_DYNAMIC |
| desc->hog = NULL; |
| #endif |
| #ifdef CONFIG_GPIO_CDEV |
| WRITE_ONCE(desc->debounce_period_us, 0); |
| #endif |
| ret = true; |
| } |
| |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| blocking_notifier_call_chain(&desc->gdev->notifier, |
| GPIOLINE_CHANGED_RELEASED, desc); |
| |
| return ret; |
| } |
| |
| void gpiod_free(struct gpio_desc *desc) |
| { |
| if (desc && desc->gdev && gpiod_free_commit(desc)) { |
| module_put(desc->gdev->owner); |
| put_device(&desc->gdev->dev); |
| } else { |
| WARN_ON(extra_checks); |
| } |
| } |
| |
| /** |
| * gpiochip_is_requested - return string iff signal was requested |
| * @gc: controller managing the signal |
| * @offset: of signal within controller's 0..(ngpio - 1) range |
| * |
| * Returns NULL if the GPIO is not currently requested, else a string. |
| * The string returned is the label passed to gpio_request(); if none has been |
| * passed it is a meaningless, non-NULL constant. |
| * |
| * This function is for use by GPIO controller drivers. The label can |
| * help with diagnostics, and knowing that the signal is used as a GPIO |
| * can help avoid accidentally multiplexing it to another controller. |
| */ |
| const char *gpiochip_is_requested(struct gpio_chip *gc, unsigned int offset) |
| { |
| struct gpio_desc *desc; |
| |
| desc = gpiochip_get_desc(gc, offset); |
| if (IS_ERR(desc)) |
| return NULL; |
| |
| if (test_bit(FLAG_REQUESTED, &desc->flags) == 0) |
| return NULL; |
| return desc->label; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_is_requested); |
| |
| /** |
| * gpiochip_request_own_desc - Allow GPIO chip to request its own descriptor |
| * @gc: GPIO chip |
| * @hwnum: hardware number of the GPIO for which to request the descriptor |
| * @label: label for the GPIO |
| * @lflags: lookup flags for this GPIO or 0 if default, this can be used to |
| * specify things like line inversion semantics with the machine flags |
| * such as GPIO_OUT_LOW |
| * @dflags: descriptor request flags for this GPIO or 0 if default, this |
| * can be used to specify consumer semantics such as open drain |
| * |
| * Function allows GPIO chip drivers to request and use their own GPIO |
| * descriptors via gpiolib API. Difference to gpiod_request() is that this |
| * function will not increase reference count of the GPIO chip module. This |
| * allows the GPIO chip module to be unloaded as needed (we assume that the |
| * GPIO chip driver handles freeing the GPIOs it has requested). |
| * |
| * Returns: |
| * A pointer to the GPIO descriptor, or an ERR_PTR()-encoded negative error |
| * code on failure. |
| */ |
| struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc, |
| unsigned int hwnum, |
| const char *label, |
| enum gpio_lookup_flags lflags, |
| enum gpiod_flags dflags) |
| { |
| struct gpio_desc *desc = gpiochip_get_desc(gc, hwnum); |
| int ret; |
| |
| if (IS_ERR(desc)) { |
| chip_err(gc, "failed to get GPIO descriptor\n"); |
| return desc; |
| } |
| |
| ret = gpiod_request_commit(desc, label); |
| if (ret < 0) |
| return ERR_PTR(ret); |
| |
| ret = gpiod_configure_flags(desc, label, lflags, dflags); |
| if (ret) { |
| chip_err(gc, "setup of own GPIO %s failed\n", label); |
| gpiod_free_commit(desc); |
| return ERR_PTR(ret); |
| } |
| |
| return desc; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_request_own_desc); |
| |
| /** |
| * gpiochip_free_own_desc - Free GPIO requested by the chip driver |
| * @desc: GPIO descriptor to free |
| * |
| * Function frees the given GPIO requested previously with |
| * gpiochip_request_own_desc(). |
| */ |
| void gpiochip_free_own_desc(struct gpio_desc *desc) |
| { |
| if (desc) |
| gpiod_free_commit(desc); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_free_own_desc); |
| |
| /* |
| * Drivers MUST set GPIO direction before making get/set calls. In |
| * some cases this is done in early boot, before IRQs are enabled. |
| * |
| * As a rule these aren't called more than once (except for drivers |
| * using the open-drain emulation idiom) so these are natural places |
| * to accumulate extra debugging checks. Note that we can't (yet) |
| * rely on gpio_request() having been called beforehand. |
| */ |
| |
| static int gpio_do_set_config(struct gpio_chip *gc, unsigned int offset, |
| unsigned long config) |
| { |
| if (!gc->set_config) |
| return -ENOTSUPP; |
| |
| return gc->set_config(gc, offset, config); |
| } |
| |
| static int gpio_set_config_with_argument(struct gpio_desc *desc, |
| enum pin_config_param mode, |
| u32 argument) |
| { |
| struct gpio_chip *gc = desc->gdev->chip; |
| unsigned long config; |
| |
| config = pinconf_to_config_packed(mode, argument); |
| return gpio_do_set_config(gc, gpio_chip_hwgpio(desc), config); |
| } |
| |
| static int gpio_set_config_with_argument_optional(struct gpio_desc *desc, |
| enum pin_config_param mode, |
| u32 argument) |
| { |
| struct device *dev = &desc->gdev->dev; |
| int gpio = gpio_chip_hwgpio(desc); |
| int ret; |
| |
| ret = gpio_set_config_with_argument(desc, mode, argument); |
| if (ret != -ENOTSUPP) |
| return ret; |
| |
| switch (mode) { |
| case PIN_CONFIG_PERSIST_STATE: |
| dev_dbg(dev, "Persistence not supported for GPIO %d\n", gpio); |
| break; |
| default: |
| break; |
| } |
| |
| return 0; |
| } |
| |
| static int gpio_set_config(struct gpio_desc *desc, enum pin_config_param mode) |
| { |
| return gpio_set_config_with_argument(desc, mode, 0); |
| } |
| |
| static int gpio_set_bias(struct gpio_desc *desc) |
| { |
| enum pin_config_param bias; |
| unsigned int arg; |
| |
| if (test_bit(FLAG_BIAS_DISABLE, &desc->flags)) |
| bias = PIN_CONFIG_BIAS_DISABLE; |
| else if (test_bit(FLAG_PULL_UP, &desc->flags)) |
| bias = PIN_CONFIG_BIAS_PULL_UP; |
| else if (test_bit(FLAG_PULL_DOWN, &desc->flags)) |
| bias = PIN_CONFIG_BIAS_PULL_DOWN; |
| else |
| return 0; |
| |
| switch (bias) { |
| case PIN_CONFIG_BIAS_PULL_DOWN: |
| case PIN_CONFIG_BIAS_PULL_UP: |
| arg = 1; |
| break; |
| |
| default: |
| arg = 0; |
| break; |
| } |
| |
| return gpio_set_config_with_argument_optional(desc, bias, arg); |
| } |
| |
| int gpio_set_debounce_timeout(struct gpio_desc *desc, unsigned int debounce) |
| { |
| return gpio_set_config_with_argument_optional(desc, |
| PIN_CONFIG_INPUT_DEBOUNCE, |
| debounce); |
| } |
| |
| /** |
| * gpiod_direction_input - set the GPIO direction to input |
| * @desc: GPIO to set to input |
| * |
| * Set the direction of the passed GPIO to input, such as gpiod_get_value() can |
| * be called safely on it. |
| * |
| * Return 0 in case of success, else an error code. |
| */ |
| int gpiod_direction_input(struct gpio_desc *desc) |
| { |
| struct gpio_chip *gc; |
| int ret = 0; |
| |
| VALIDATE_DESC(desc); |
| gc = desc->gdev->chip; |
| |
| /* |
| * It is legal to have no .get() and .direction_input() specified if |
| * the chip is output-only, but you can't specify .direction_input() |
| * and not support the .get() operation, that doesn't make sense. |
| */ |
| if (!gc->get && gc->direction_input) { |
| gpiod_warn(desc, |
| "%s: missing get() but have direction_input()\n", |
| __func__); |
| return -EIO; |
| } |
| |
| /* |
| * If we have a .direction_input() callback, things are simple, |
| * just call it. Else we are some input-only chip so try to check the |
| * direction (if .get_direction() is supported) else we silently |
| * assume we are in input mode after this. |
| */ |
| if (gc->direction_input) { |
| ret = gc->direction_input(gc, gpio_chip_hwgpio(desc)); |
| } else if (gc->get_direction && |
| (gc->get_direction(gc, gpio_chip_hwgpio(desc)) != 1)) { |
| gpiod_warn(desc, |
| "%s: missing direction_input() operation and line is output\n", |
| __func__); |
| return -EIO; |
| } |
| if (ret == 0) { |
| clear_bit(FLAG_IS_OUT, &desc->flags); |
| ret = gpio_set_bias(desc); |
| } |
| |
| trace_gpio_direction(desc_to_gpio(desc), 1, ret); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_direction_input); |
| |
| static int gpiod_direction_output_raw_commit(struct gpio_desc *desc, int value) |
| { |
| struct gpio_chip *gc = desc->gdev->chip; |
| int val = !!value; |
| int ret = 0; |
| |
| /* |
| * It's OK not to specify .direction_output() if the gpiochip is |
| * output-only, but if there is then not even a .set() operation it |
| * is pretty tricky to drive the output line. |
| */ |
| if (!gc->set && !gc->direction_output) { |
| gpiod_warn(desc, |
| "%s: missing set() and direction_output() operations\n", |
| __func__); |
| return -EIO; |
| } |
| |
| if (gc->direction_output) { |
| ret = gc->direction_output(gc, gpio_chip_hwgpio(desc), val); |
| } else { |
| /* Check that we are in output mode if we can */ |
| if (gc->get_direction && |
| gc->get_direction(gc, gpio_chip_hwgpio(desc))) { |
| gpiod_warn(desc, |
| "%s: missing direction_output() operation\n", |
| __func__); |
| return -EIO; |
| } |
| /* |
| * If we can't actively set the direction, we are some |
| * output-only chip, so just drive the output as desired. |
| */ |
| gc->set(gc, gpio_chip_hwgpio(desc), val); |
| } |
| |
| if (!ret) |
| set_bit(FLAG_IS_OUT, &desc->flags); |
| trace_gpio_value(desc_to_gpio(desc), 0, val); |
| trace_gpio_direction(desc_to_gpio(desc), 0, ret); |
| return ret; |
| } |
| |
| /** |
| * gpiod_direction_output_raw - set the GPIO direction to output |
| * @desc: GPIO to set to output |
| * @value: initial output value of the GPIO |
| * |
| * Set the direction of the passed GPIO to output, such as gpiod_set_value() can |
| * be called safely on it. The initial value of the output must be specified |
| * as raw value on the physical line without regard for the ACTIVE_LOW status. |
| * |
| * Return 0 in case of success, else an error code. |
| */ |
| int gpiod_direction_output_raw(struct gpio_desc *desc, int value) |
| { |
| VALIDATE_DESC(desc); |
| return gpiod_direction_output_raw_commit(desc, value); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_direction_output_raw); |
| |
| /** |
| * gpiod_direction_output - set the GPIO direction to output |
| * @desc: GPIO to set to output |
| * @value: initial output value of the GPIO |
| * |
| * Set the direction of the passed GPIO to output, such as gpiod_set_value() can |
| * be called safely on it. The initial value of the output must be specified |
| * as the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into |
| * account. |
| * |
| * Return 0 in case of success, else an error code. |
| */ |
| int gpiod_direction_output(struct gpio_desc *desc, int value) |
| { |
| int ret; |
| |
| VALIDATE_DESC(desc); |
| if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| value = !value; |
| else |
| value = !!value; |
| |
| /* GPIOs used for enabled IRQs shall not be set as output */ |
| if (test_bit(FLAG_USED_AS_IRQ, &desc->flags) && |
| test_bit(FLAG_IRQ_IS_ENABLED, &desc->flags)) { |
| gpiod_err(desc, |
| "%s: tried to set a GPIO tied to an IRQ as output\n", |
| __func__); |
| return -EIO; |
| } |
| |
| if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
| /* First see if we can enable open drain in hardware */ |
| ret = gpio_set_config(desc, PIN_CONFIG_DRIVE_OPEN_DRAIN); |
| if (!ret) |
| goto set_output_value; |
| /* Emulate open drain by not actively driving the line high */ |
| if (value) { |
| ret = gpiod_direction_input(desc); |
| goto set_output_flag; |
| } |
| } |
| else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) { |
| ret = gpio_set_config(desc, PIN_CONFIG_DRIVE_OPEN_SOURCE); |
| if (!ret) |
| goto set_output_value; |
| /* Emulate open source by not actively driving the line low */ |
| if (!value) { |
| ret = gpiod_direction_input(desc); |
| goto set_output_flag; |
| } |
| } else { |
| gpio_set_config(desc, PIN_CONFIG_DRIVE_PUSH_PULL); |
| } |
| |
| set_output_value: |
| ret = gpio_set_bias(desc); |
| if (ret) |
| return ret; |
| return gpiod_direction_output_raw_commit(desc, value); |
| |
| set_output_flag: |
| /* |
| * When emulating open-source or open-drain functionalities by not |
| * actively driving the line (setting mode to input) we still need to |
| * set the IS_OUT flag or otherwise we won't be able to set the line |
| * value anymore. |
| */ |
| if (ret == 0) |
| set_bit(FLAG_IS_OUT, &desc->flags); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_direction_output); |
| |
| /** |
| * gpiod_set_config - sets @config for a GPIO |
| * @desc: descriptor of the GPIO for which to set the configuration |
| * @config: Same packed config format as generic pinconf |
| * |
| * Returns: |
| * 0 on success, %-ENOTSUPP if the controller doesn't support setting the |
| * configuration. |
| */ |
| int gpiod_set_config(struct gpio_desc *desc, unsigned long config) |
| { |
| struct gpio_chip *gc; |
| |
| VALIDATE_DESC(desc); |
| gc = desc->gdev->chip; |
| |
| return gpio_do_set_config(gc, gpio_chip_hwgpio(desc), config); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_config); |
| |
| /** |
| * gpiod_set_debounce - sets @debounce time for a GPIO |
| * @desc: descriptor of the GPIO for which to set debounce time |
| * @debounce: debounce time in microseconds |
| * |
| * Returns: |
| * 0 on success, %-ENOTSUPP if the controller doesn't support setting the |
| * debounce time. |
| */ |
| int gpiod_set_debounce(struct gpio_desc *desc, unsigned int debounce) |
| { |
| unsigned long config; |
| |
| config = pinconf_to_config_packed(PIN_CONFIG_INPUT_DEBOUNCE, debounce); |
| return gpiod_set_config(desc, config); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_debounce); |
| |
| /** |
| * gpiod_set_transitory - Lose or retain GPIO state on suspend or reset |
| * @desc: descriptor of the GPIO for which to configure persistence |
| * @transitory: True to lose state on suspend or reset, false for persistence |
| * |
| * Returns: |
| * 0 on success, otherwise a negative error code. |
| */ |
| int gpiod_set_transitory(struct gpio_desc *desc, bool transitory) |
| { |
| VALIDATE_DESC(desc); |
| /* |
| * Handle FLAG_TRANSITORY first, enabling queries to gpiolib for |
| * persistence state. |
| */ |
| assign_bit(FLAG_TRANSITORY, &desc->flags, transitory); |
| |
| /* If the driver supports it, set the persistence state now */ |
| return gpio_set_config_with_argument_optional(desc, |
| PIN_CONFIG_PERSIST_STATE, |
| !transitory); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_transitory); |
| |
| /** |
| * gpiod_is_active_low - test whether a GPIO is active-low or not |
| * @desc: the gpio descriptor to test |
| * |
| * Returns 1 if the GPIO is active-low, 0 otherwise. |
| */ |
| int gpiod_is_active_low(const struct gpio_desc *desc) |
| { |
| VALIDATE_DESC(desc); |
| return test_bit(FLAG_ACTIVE_LOW, &desc->flags); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_is_active_low); |
| |
| /** |
| * gpiod_toggle_active_low - toggle whether a GPIO is active-low or not |
| * @desc: the gpio descriptor to change |
| */ |
| void gpiod_toggle_active_low(struct gpio_desc *desc) |
| { |
| VALIDATE_DESC_VOID(desc); |
| change_bit(FLAG_ACTIVE_LOW, &desc->flags); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_toggle_active_low); |
| |
| /* I/O calls are only valid after configuration completed; the relevant |
| * "is this a valid GPIO" error checks should already have been done. |
| * |
| * "Get" operations are often inlinable as reading a pin value register, |
| * and masking the relevant bit in that register. |
| * |
| * When "set" operations are inlinable, they involve writing that mask to |
| * one register to set a low value, or a different register to set it high. |
| * Otherwise locking is needed, so there may be little value to inlining. |
| * |
| *------------------------------------------------------------------------ |
| * |
| * IMPORTANT!!! The hot paths -- get/set value -- assume that callers |
| * have requested the GPIO. That can include implicit requesting by |
| * a direction setting call. Marking a gpio as requested locks its chip |
| * in memory, guaranteeing that these table lookups need no more locking |
| * and that gpiochip_remove() will fail. |
| * |
| * REVISIT when debugging, consider adding some instrumentation to ensure |
| * that the GPIO was actually requested. |
| */ |
| |
| static int gpiod_get_raw_value_commit(const struct gpio_desc *desc) |
| { |
| struct gpio_chip *gc; |
| int offset; |
| int value; |
| |
| gc = desc->gdev->chip; |
| offset = gpio_chip_hwgpio(desc); |
| value = gc->get ? gc->get(gc, offset) : -EIO; |
| value = value < 0 ? value : !!value; |
| trace_gpio_value(desc_to_gpio(desc), 1, value); |
| return value; |
| } |
| |
| static int gpio_chip_get_multiple(struct gpio_chip *gc, |
| unsigned long *mask, unsigned long *bits) |
| { |
| if (gc->get_multiple) { |
| return gc->get_multiple(gc, mask, bits); |
| } else if (gc->get) { |
| int i, value; |
| |
| for_each_set_bit(i, mask, gc->ngpio) { |
| value = gc->get(gc, i); |
| if (value < 0) |
| return value; |
| __assign_bit(i, bits, value); |
| } |
| return 0; |
| } |
| return -EIO; |
| } |
| |
| int gpiod_get_array_value_complex(bool raw, bool can_sleep, |
| unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| int ret, i = 0; |
| |
| /* |
| * Validate array_info against desc_array and its size. |
| * It should immediately follow desc_array if both |
| * have been obtained from the same gpiod_get_array() call. |
| */ |
| if (array_info && array_info->desc == desc_array && |
| array_size <= array_info->size && |
| (void *)array_info == desc_array + array_info->size) { |
| if (!can_sleep) |
| WARN_ON(array_info->chip->can_sleep); |
| |
| ret = gpio_chip_get_multiple(array_info->chip, |
| array_info->get_mask, |
| value_bitmap); |
| if (ret) |
| return ret; |
| |
| if (!raw && !bitmap_empty(array_info->invert_mask, array_size)) |
| bitmap_xor(value_bitmap, value_bitmap, |
| array_info->invert_mask, array_size); |
| |
| i = find_first_zero_bit(array_info->get_mask, array_size); |
| if (i == array_size) |
| return 0; |
| } else { |
| array_info = NULL; |
| } |
| |
| while (i < array_size) { |
| struct gpio_chip *gc = desc_array[i]->gdev->chip; |
| DECLARE_BITMAP(fastpath_mask, FASTPATH_NGPIO); |
| DECLARE_BITMAP(fastpath_bits, FASTPATH_NGPIO); |
| unsigned long *mask, *bits; |
| int first, j; |
| |
| if (likely(gc->ngpio <= FASTPATH_NGPIO)) { |
| mask = fastpath_mask; |
| bits = fastpath_bits; |
| } else { |
| gfp_t flags = can_sleep ? GFP_KERNEL : GFP_ATOMIC; |
| |
| mask = bitmap_alloc(gc->ngpio, flags); |
| if (!mask) |
| return -ENOMEM; |
| |
| bits = bitmap_alloc(gc->ngpio, flags); |
| if (!bits) { |
| bitmap_free(mask); |
| return -ENOMEM; |
| } |
| } |
| |
| bitmap_zero(mask, gc->ngpio); |
| |
| if (!can_sleep) |
| WARN_ON(gc->can_sleep); |
| |
| /* collect all inputs belonging to the same chip */ |
| first = i; |
| do { |
| const struct gpio_desc *desc = desc_array[i]; |
| int hwgpio = gpio_chip_hwgpio(desc); |
| |
| __set_bit(hwgpio, mask); |
| i++; |
| |
| if (array_info) |
| i = find_next_zero_bit(array_info->get_mask, |
| array_size, i); |
| } while ((i < array_size) && |
| (desc_array[i]->gdev->chip == gc)); |
| |
| ret = gpio_chip_get_multiple(gc, mask, bits); |
| if (ret) { |
| if (mask != fastpath_mask) |
| bitmap_free(mask); |
| if (bits != fastpath_bits) |
| bitmap_free(bits); |
| return ret; |
| } |
| |
| for (j = first; j < i; ) { |
| const struct gpio_desc *desc = desc_array[j]; |
| int hwgpio = gpio_chip_hwgpio(desc); |
| int value = test_bit(hwgpio, bits); |
| |
| if (!raw && test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| value = !value; |
| __assign_bit(j, value_bitmap, value); |
| trace_gpio_value(desc_to_gpio(desc), 1, value); |
| j++; |
| |
| if (array_info) |
| j = find_next_zero_bit(array_info->get_mask, i, |
| j); |
| } |
| |
| if (mask != fastpath_mask) |
| bitmap_free(mask); |
| if (bits != fastpath_bits) |
| bitmap_free(bits); |
| } |
| return 0; |
| } |
| |
| /** |
| * gpiod_get_raw_value() - return a gpio's raw value |
| * @desc: gpio whose value will be returned |
| * |
| * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
| * its ACTIVE_LOW status, or negative errno on failure. |
| * |
| * This function can be called from contexts where we cannot sleep, and will |
| * complain if the GPIO chip functions potentially sleep. |
| */ |
| int gpiod_get_raw_value(const struct gpio_desc *desc) |
| { |
| VALIDATE_DESC(desc); |
| /* Should be using gpiod_get_raw_value_cansleep() */ |
| WARN_ON(desc->gdev->chip->can_sleep); |
| return gpiod_get_raw_value_commit(desc); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_raw_value); |
| |
| /** |
| * gpiod_get_value() - return a gpio's value |
| * @desc: gpio whose value will be returned |
| * |
| * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into |
| * account, or negative errno on failure. |
| * |
| * This function can be called from contexts where we cannot sleep, and will |
| * complain if the GPIO chip functions potentially sleep. |
| */ |
| int gpiod_get_value(const struct gpio_desc *desc) |
| { |
| int value; |
| |
| VALIDATE_DESC(desc); |
| /* Should be using gpiod_get_value_cansleep() */ |
| WARN_ON(desc->gdev->chip->can_sleep); |
| |
| value = gpiod_get_raw_value_commit(desc); |
| if (value < 0) |
| return value; |
| |
| if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| value = !value; |
| |
| return value; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_value); |
| |
| /** |
| * gpiod_get_raw_array_value() - read raw values from an array of GPIOs |
| * @array_size: number of elements in the descriptor array / value bitmap |
| * @desc_array: array of GPIO descriptors whose values will be read |
| * @array_info: information on applicability of fast bitmap processing path |
| * @value_bitmap: bitmap to store the read values |
| * |
| * Read the raw values of the GPIOs, i.e. the values of the physical lines |
| * without regard for their ACTIVE_LOW status. Return 0 in case of success, |
| * else an error code. |
| * |
| * This function can be called from contexts where we cannot sleep, |
| * and it will complain if the GPIO chip functions potentially sleep. |
| */ |
| int gpiod_get_raw_array_value(unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| if (!desc_array) |
| return -EINVAL; |
| return gpiod_get_array_value_complex(true, false, array_size, |
| desc_array, array_info, |
| value_bitmap); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value); |
| |
| /** |
| * gpiod_get_array_value() - read values from an array of GPIOs |
| * @array_size: number of elements in the descriptor array / value bitmap |
| * @desc_array: array of GPIO descriptors whose values will be read |
| * @array_info: information on applicability of fast bitmap processing path |
| * @value_bitmap: bitmap to store the read values |
| * |
| * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status |
| * into account. Return 0 in case of success, else an error code. |
| * |
| * This function can be called from contexts where we cannot sleep, |
| * and it will complain if the GPIO chip functions potentially sleep. |
| */ |
| int gpiod_get_array_value(unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| if (!desc_array) |
| return -EINVAL; |
| return gpiod_get_array_value_complex(false, false, array_size, |
| desc_array, array_info, |
| value_bitmap); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_array_value); |
| |
| /* |
| * gpio_set_open_drain_value_commit() - Set the open drain gpio's value. |
| * @desc: gpio descriptor whose state need to be set. |
| * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
| */ |
| static void gpio_set_open_drain_value_commit(struct gpio_desc *desc, bool value) |
| { |
| int ret = 0; |
| struct gpio_chip *gc = desc->gdev->chip; |
| int offset = gpio_chip_hwgpio(desc); |
| |
| if (value) { |
| ret = gc->direction_input(gc, offset); |
| } else { |
| ret = gc->direction_output(gc, offset, 0); |
| if (!ret) |
| set_bit(FLAG_IS_OUT, &desc->flags); |
| } |
| trace_gpio_direction(desc_to_gpio(desc), value, ret); |
| if (ret < 0) |
| gpiod_err(desc, |
| "%s: Error in set_value for open drain err %d\n", |
| __func__, ret); |
| } |
| |
| /* |
| * _gpio_set_open_source_value() - Set the open source gpio's value. |
| * @desc: gpio descriptor whose state need to be set. |
| * @value: Non-zero for setting it HIGH otherwise it will set to LOW. |
| */ |
| static void gpio_set_open_source_value_commit(struct gpio_desc *desc, bool value) |
| { |
| int ret = 0; |
| struct gpio_chip *gc = desc->gdev->chip; |
| int offset = gpio_chip_hwgpio(desc); |
| |
| if (value) { |
| ret = gc->direction_output(gc, offset, 1); |
| if (!ret) |
| set_bit(FLAG_IS_OUT, &desc->flags); |
| } else { |
| ret = gc->direction_input(gc, offset); |
| } |
| trace_gpio_direction(desc_to_gpio(desc), !value, ret); |
| if (ret < 0) |
| gpiod_err(desc, |
| "%s: Error in set_value for open source err %d\n", |
| __func__, ret); |
| } |
| |
| static void gpiod_set_raw_value_commit(struct gpio_desc *desc, bool value) |
| { |
| struct gpio_chip *gc; |
| |
| gc = desc->gdev->chip; |
| trace_gpio_value(desc_to_gpio(desc), 0, value); |
| gc->set(gc, gpio_chip_hwgpio(desc), value); |
| } |
| |
| /* |
| * set multiple outputs on the same chip; |
| * use the chip's set_multiple function if available; |
| * otherwise set the outputs sequentially; |
| * @chip: the GPIO chip we operate on |
| * @mask: bit mask array; one bit per output; BITS_PER_LONG bits per word |
| * defines which outputs are to be changed |
| * @bits: bit value array; one bit per output; BITS_PER_LONG bits per word |
| * defines the values the outputs specified by mask are to be set to |
| */ |
| static void gpio_chip_set_multiple(struct gpio_chip *gc, |
| unsigned long *mask, unsigned long *bits) |
| { |
| if (gc->set_multiple) { |
| gc->set_multiple(gc, mask, bits); |
| } else { |
| unsigned int i; |
| |
| /* set outputs if the corresponding mask bit is set */ |
| for_each_set_bit(i, mask, gc->ngpio) |
| gc->set(gc, i, test_bit(i, bits)); |
| } |
| } |
| |
| int gpiod_set_array_value_complex(bool raw, bool can_sleep, |
| unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| int i = 0; |
| |
| /* |
| * Validate array_info against desc_array and its size. |
| * It should immediately follow desc_array if both |
| * have been obtained from the same gpiod_get_array() call. |
| */ |
| if (array_info && array_info->desc == desc_array && |
| array_size <= array_info->size && |
| (void *)array_info == desc_array + array_info->size) { |
| if (!can_sleep) |
| WARN_ON(array_info->chip->can_sleep); |
| |
| if (!raw && !bitmap_empty(array_info->invert_mask, array_size)) |
| bitmap_xor(value_bitmap, value_bitmap, |
| array_info->invert_mask, array_size); |
| |
| gpio_chip_set_multiple(array_info->chip, array_info->set_mask, |
| value_bitmap); |
| |
| i = find_first_zero_bit(array_info->set_mask, array_size); |
| if (i == array_size) |
| return 0; |
| } else { |
| array_info = NULL; |
| } |
| |
| while (i < array_size) { |
| struct gpio_chip *gc = desc_array[i]->gdev->chip; |
| DECLARE_BITMAP(fastpath_mask, FASTPATH_NGPIO); |
| DECLARE_BITMAP(fastpath_bits, FASTPATH_NGPIO); |
| unsigned long *mask, *bits; |
| int count = 0; |
| |
| if (likely(gc->ngpio <= FASTPATH_NGPIO)) { |
| mask = fastpath_mask; |
| bits = fastpath_bits; |
| } else { |
| gfp_t flags = can_sleep ? GFP_KERNEL : GFP_ATOMIC; |
| |
| mask = bitmap_alloc(gc->ngpio, flags); |
| if (!mask) |
| return -ENOMEM; |
| |
| bits = bitmap_alloc(gc->ngpio, flags); |
| if (!bits) { |
| bitmap_free(mask); |
| return -ENOMEM; |
| } |
| } |
| |
| bitmap_zero(mask, gc->ngpio); |
| |
| if (!can_sleep) |
| WARN_ON(gc->can_sleep); |
| |
| do { |
| struct gpio_desc *desc = desc_array[i]; |
| int hwgpio = gpio_chip_hwgpio(desc); |
| int value = test_bit(i, value_bitmap); |
| |
| /* |
| * Pins applicable for fast input but not for |
| * fast output processing may have been already |
| * inverted inside the fast path, skip them. |
| */ |
| if (!raw && !(array_info && |
| test_bit(i, array_info->invert_mask)) && |
| test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| value = !value; |
| trace_gpio_value(desc_to_gpio(desc), 0, value); |
| /* |
| * collect all normal outputs belonging to the same chip |
| * open drain and open source outputs are set individually |
| */ |
| if (test_bit(FLAG_OPEN_DRAIN, &desc->flags) && !raw) { |
| gpio_set_open_drain_value_commit(desc, value); |
| } else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags) && !raw) { |
| gpio_set_open_source_value_commit(desc, value); |
| } else { |
| __set_bit(hwgpio, mask); |
| __assign_bit(hwgpio, bits, value); |
| count++; |
| } |
| i++; |
| |
| if (array_info) |
| i = find_next_zero_bit(array_info->set_mask, |
| array_size, i); |
| } while ((i < array_size) && |
| (desc_array[i]->gdev->chip == gc)); |
| /* push collected bits to outputs */ |
| if (count != 0) |
| gpio_chip_set_multiple(gc, mask, bits); |
| |
| if (mask != fastpath_mask) |
| bitmap_free(mask); |
| if (bits != fastpath_bits) |
| bitmap_free(bits); |
| } |
| return 0; |
| } |
| |
| /** |
| * gpiod_set_raw_value() - assign a gpio's raw value |
| * @desc: gpio whose value will be assigned |
| * @value: value to assign |
| * |
| * Set the raw value of the GPIO, i.e. the value of its physical line without |
| * regard for its ACTIVE_LOW status. |
| * |
| * This function can be called from contexts where we cannot sleep, and will |
| * complain if the GPIO chip functions potentially sleep. |
| */ |
| void gpiod_set_raw_value(struct gpio_desc *desc, int value) |
| { |
| VALIDATE_DESC_VOID(desc); |
| /* Should be using gpiod_set_raw_value_cansleep() */ |
| WARN_ON(desc->gdev->chip->can_sleep); |
| gpiod_set_raw_value_commit(desc, value); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_raw_value); |
| |
| /** |
| * gpiod_set_value_nocheck() - set a GPIO line value without checking |
| * @desc: the descriptor to set the value on |
| * @value: value to set |
| * |
| * This sets the value of a GPIO line backing a descriptor, applying |
| * different semantic quirks like active low and open drain/source |
| * handling. |
| */ |
| static void gpiod_set_value_nocheck(struct gpio_desc *desc, int value) |
| { |
| if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| value = !value; |
| if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) |
| gpio_set_open_drain_value_commit(desc, value); |
| else if (test_bit(FLAG_OPEN_SOURCE, &desc->flags)) |
| gpio_set_open_source_value_commit(desc, value); |
| else |
| gpiod_set_raw_value_commit(desc, value); |
| } |
| |
| /** |
| * gpiod_set_value() - assign a gpio's value |
| * @desc: gpio whose value will be assigned |
| * @value: value to assign |
| * |
| * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW, |
| * OPEN_DRAIN and OPEN_SOURCE flags into account. |
| * |
| * This function can be called from contexts where we cannot sleep, and will |
| * complain if the GPIO chip functions potentially sleep. |
| */ |
| void gpiod_set_value(struct gpio_desc *desc, int value) |
| { |
| VALIDATE_DESC_VOID(desc); |
| /* Should be using gpiod_set_value_cansleep() */ |
| WARN_ON(desc->gdev->chip->can_sleep); |
| gpiod_set_value_nocheck(desc, value); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_value); |
| |
| /** |
| * gpiod_set_raw_array_value() - assign values to an array of GPIOs |
| * @array_size: number of elements in the descriptor array / value bitmap |
| * @desc_array: array of GPIO descriptors whose values will be assigned |
| * @array_info: information on applicability of fast bitmap processing path |
| * @value_bitmap: bitmap of values to assign |
| * |
| * Set the raw values of the GPIOs, i.e. the values of the physical lines |
| * without regard for their ACTIVE_LOW status. |
| * |
| * This function can be called from contexts where we cannot sleep, and will |
| * complain if the GPIO chip functions potentially sleep. |
| */ |
| int gpiod_set_raw_array_value(unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| if (!desc_array) |
| return -EINVAL; |
| return gpiod_set_array_value_complex(true, false, array_size, |
| desc_array, array_info, value_bitmap); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value); |
| |
| /** |
| * gpiod_set_array_value() - assign values to an array of GPIOs |
| * @array_size: number of elements in the descriptor array / value bitmap |
| * @desc_array: array of GPIO descriptors whose values will be assigned |
| * @array_info: information on applicability of fast bitmap processing path |
| * @value_bitmap: bitmap of values to assign |
| * |
| * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status |
| * into account. |
| * |
| * This function can be called from contexts where we cannot sleep, and will |
| * complain if the GPIO chip functions potentially sleep. |
| */ |
| int gpiod_set_array_value(unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| if (!desc_array) |
| return -EINVAL; |
| return gpiod_set_array_value_complex(false, false, array_size, |
| desc_array, array_info, |
| value_bitmap); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_array_value); |
| |
| /** |
| * gpiod_cansleep() - report whether gpio value access may sleep |
| * @desc: gpio to check |
| * |
| */ |
| int gpiod_cansleep(const struct gpio_desc *desc) |
| { |
| VALIDATE_DESC(desc); |
| return desc->gdev->chip->can_sleep; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_cansleep); |
| |
| /** |
| * gpiod_set_consumer_name() - set the consumer name for the descriptor |
| * @desc: gpio to set the consumer name on |
| * @name: the new consumer name |
| */ |
| int gpiod_set_consumer_name(struct gpio_desc *desc, const char *name) |
| { |
| VALIDATE_DESC(desc); |
| if (name) { |
| name = kstrdup_const(name, GFP_KERNEL); |
| if (!name) |
| return -ENOMEM; |
| } |
| |
| kfree_const(desc->label); |
| desc_set_label(desc, name); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_consumer_name); |
| |
| /** |
| * gpiod_to_irq() - return the IRQ corresponding to a GPIO |
| * @desc: gpio whose IRQ will be returned (already requested) |
| * |
| * Return the IRQ corresponding to the passed GPIO, or an error code in case of |
| * error. |
| */ |
| int gpiod_to_irq(const struct gpio_desc *desc) |
| { |
| struct gpio_chip *gc; |
| int offset; |
| |
| /* |
| * Cannot VALIDATE_DESC() here as gpiod_to_irq() consumer semantics |
| * requires this function to not return zero on an invalid descriptor |
| * but rather a negative error number. |
| */ |
| if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip) |
| return -EINVAL; |
| |
| gc = desc->gdev->chip; |
| offset = gpio_chip_hwgpio(desc); |
| if (gc->to_irq) { |
| int retirq = gc->to_irq(gc, offset); |
| |
| /* Zero means NO_IRQ */ |
| if (!retirq) |
| return -ENXIO; |
| |
| return retirq; |
| } |
| #ifdef CONFIG_GPIOLIB_IRQCHIP |
| if (gc->irq.chip) { |
| /* |
| * Avoid race condition with other code, which tries to lookup |
| * an IRQ before the irqchip has been properly registered, |
| * i.e. while gpiochip is still being brought up. |
| */ |
| return -EPROBE_DEFER; |
| } |
| #endif |
| return -ENXIO; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_to_irq); |
| |
| /** |
| * gpiochip_lock_as_irq() - lock a GPIO to be used as IRQ |
| * @gc: the chip the GPIO to lock belongs to |
| * @offset: the offset of the GPIO to lock as IRQ |
| * |
| * This is used directly by GPIO drivers that want to lock down |
| * a certain GPIO line to be used for IRQs. |
| */ |
| int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset) |
| { |
| struct gpio_desc *desc; |
| |
| desc = gpiochip_get_desc(gc, offset); |
| if (IS_ERR(desc)) |
| return PTR_ERR(desc); |
| |
| /* |
| * If it's fast: flush the direction setting if something changed |
| * behind our back |
| */ |
| if (!gc->can_sleep && gc->get_direction) { |
| int dir = gpiod_get_direction(desc); |
| |
| if (dir < 0) { |
| chip_err(gc, "%s: cannot get GPIO direction\n", |
| __func__); |
| return dir; |
| } |
| } |
| |
| /* To be valid for IRQ the line needs to be input or open drain */ |
| if (test_bit(FLAG_IS_OUT, &desc->flags) && |
| !test_bit(FLAG_OPEN_DRAIN, &desc->flags)) { |
| chip_err(gc, |
| "%s: tried to flag a GPIO set as output for IRQ\n", |
| __func__); |
| return -EIO; |
| } |
| |
| set_bit(FLAG_USED_AS_IRQ, &desc->flags); |
| set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
| |
| /* |
| * If the consumer has not set up a label (such as when the |
| * IRQ is referenced from .to_irq()) we set up a label here |
| * so it is clear this is used as an interrupt. |
| */ |
| if (!desc->label) |
| desc_set_label(desc, "interrupt"); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_lock_as_irq); |
| |
| /** |
| * gpiochip_unlock_as_irq() - unlock a GPIO used as IRQ |
| * @gc: the chip the GPIO to lock belongs to |
| * @offset: the offset of the GPIO to lock as IRQ |
| * |
| * This is used directly by GPIO drivers that want to indicate |
| * that a certain GPIO is no longer used exclusively for IRQ. |
| */ |
| void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset) |
| { |
| struct gpio_desc *desc; |
| |
| desc = gpiochip_get_desc(gc, offset); |
| if (IS_ERR(desc)) |
| return; |
| |
| clear_bit(FLAG_USED_AS_IRQ, &desc->flags); |
| clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
| |
| /* If we only had this marking, erase it */ |
| if (desc->label && !strcmp(desc->label, "interrupt")) |
| desc_set_label(desc, NULL); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_unlock_as_irq); |
| |
| void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset) |
| { |
| struct gpio_desc *desc = gpiochip_get_desc(gc, offset); |
| |
| if (!IS_ERR(desc) && |
| !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) |
| clear_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_disable_irq); |
| |
| void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset) |
| { |
| struct gpio_desc *desc = gpiochip_get_desc(gc, offset); |
| |
| if (!IS_ERR(desc) && |
| !WARN_ON(!test_bit(FLAG_USED_AS_IRQ, &desc->flags))) { |
| /* |
| * We must not be output when using IRQ UNLESS we are |
| * open drain. |
| */ |
| WARN_ON(test_bit(FLAG_IS_OUT, &desc->flags) && |
| !test_bit(FLAG_OPEN_DRAIN, &desc->flags)); |
| set_bit(FLAG_IRQ_IS_ENABLED, &desc->flags); |
| } |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_enable_irq); |
| |
| bool gpiochip_line_is_irq(struct gpio_chip *gc, unsigned int offset) |
| { |
| if (offset >= gc->ngpio) |
| return false; |
| |
| return test_bit(FLAG_USED_AS_IRQ, &gc->gpiodev->descs[offset].flags); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_line_is_irq); |
| |
| int gpiochip_reqres_irq(struct gpio_chip *gc, unsigned int offset) |
| { |
| int ret; |
| |
| if (!try_module_get(gc->gpiodev->owner)) |
| return -ENODEV; |
| |
| ret = gpiochip_lock_as_irq(gc, offset); |
| if (ret) { |
| chip_err(gc, "unable to lock HW IRQ %u for IRQ\n", offset); |
| module_put(gc->gpiodev->owner); |
| return ret; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_reqres_irq); |
| |
| void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset) |
| { |
| gpiochip_unlock_as_irq(gc, offset); |
| module_put(gc->gpiodev->owner); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_relres_irq); |
| |
| bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset) |
| { |
| if (offset >= gc->ngpio) |
| return false; |
| |
| return test_bit(FLAG_OPEN_DRAIN, &gc->gpiodev->descs[offset].flags); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_line_is_open_drain); |
| |
| bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset) |
| { |
| if (offset >= gc->ngpio) |
| return false; |
| |
| return test_bit(FLAG_OPEN_SOURCE, &gc->gpiodev->descs[offset].flags); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_line_is_open_source); |
| |
| bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset) |
| { |
| if (offset >= gc->ngpio) |
| return false; |
| |
| return !test_bit(FLAG_TRANSITORY, &gc->gpiodev->descs[offset].flags); |
| } |
| EXPORT_SYMBOL_GPL(gpiochip_line_is_persistent); |
| |
| /** |
| * gpiod_get_raw_value_cansleep() - return a gpio's raw value |
| * @desc: gpio whose value will be returned |
| * |
| * Return the GPIO's raw value, i.e. the value of the physical line disregarding |
| * its ACTIVE_LOW status, or negative errno on failure. |
| * |
| * This function is to be called from contexts that can sleep. |
| */ |
| int gpiod_get_raw_value_cansleep(const struct gpio_desc *desc) |
| { |
| might_sleep_if(extra_checks); |
| VALIDATE_DESC(desc); |
| return gpiod_get_raw_value_commit(desc); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_raw_value_cansleep); |
| |
| /** |
| * gpiod_get_value_cansleep() - return a gpio's value |
| * @desc: gpio whose value will be returned |
| * |
| * Return the GPIO's logical value, i.e. taking the ACTIVE_LOW status into |
| * account, or negative errno on failure. |
| * |
| * This function is to be called from contexts that can sleep. |
| */ |
| int gpiod_get_value_cansleep(const struct gpio_desc *desc) |
| { |
| int value; |
| |
| might_sleep_if(extra_checks); |
| VALIDATE_DESC(desc); |
| value = gpiod_get_raw_value_commit(desc); |
| if (value < 0) |
| return value; |
| |
| if (test_bit(FLAG_ACTIVE_LOW, &desc->flags)) |
| value = !value; |
| |
| return value; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_value_cansleep); |
| |
| /** |
| * gpiod_get_raw_array_value_cansleep() - read raw values from an array of GPIOs |
| * @array_size: number of elements in the descriptor array / value bitmap |
| * @desc_array: array of GPIO descriptors whose values will be read |
| * @array_info: information on applicability of fast bitmap processing path |
| * @value_bitmap: bitmap to store the read values |
| * |
| * Read the raw values of the GPIOs, i.e. the values of the physical lines |
| * without regard for their ACTIVE_LOW status. Return 0 in case of success, |
| * else an error code. |
| * |
| * This function is to be called from contexts that can sleep. |
| */ |
| int gpiod_get_raw_array_value_cansleep(unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| might_sleep_if(extra_checks); |
| if (!desc_array) |
| return -EINVAL; |
| return gpiod_get_array_value_complex(true, true, array_size, |
| desc_array, array_info, |
| value_bitmap); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_raw_array_value_cansleep); |
| |
| /** |
| * gpiod_get_array_value_cansleep() - read values from an array of GPIOs |
| * @array_size: number of elements in the descriptor array / value bitmap |
| * @desc_array: array of GPIO descriptors whose values will be read |
| * @array_info: information on applicability of fast bitmap processing path |
| * @value_bitmap: bitmap to store the read values |
| * |
| * Read the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status |
| * into account. Return 0 in case of success, else an error code. |
| * |
| * This function is to be called from contexts that can sleep. |
| */ |
| int gpiod_get_array_value_cansleep(unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| might_sleep_if(extra_checks); |
| if (!desc_array) |
| return -EINVAL; |
| return gpiod_get_array_value_complex(false, true, array_size, |
| desc_array, array_info, |
| value_bitmap); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_array_value_cansleep); |
| |
| /** |
| * gpiod_set_raw_value_cansleep() - assign a gpio's raw value |
| * @desc: gpio whose value will be assigned |
| * @value: value to assign |
| * |
| * Set the raw value of the GPIO, i.e. the value of its physical line without |
| * regard for its ACTIVE_LOW status. |
| * |
| * This function is to be called from contexts that can sleep. |
| */ |
| void gpiod_set_raw_value_cansleep(struct gpio_desc *desc, int value) |
| { |
| might_sleep_if(extra_checks); |
| VALIDATE_DESC_VOID(desc); |
| gpiod_set_raw_value_commit(desc, value); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_raw_value_cansleep); |
| |
| /** |
| * gpiod_set_value_cansleep() - assign a gpio's value |
| * @desc: gpio whose value will be assigned |
| * @value: value to assign |
| * |
| * Set the logical value of the GPIO, i.e. taking its ACTIVE_LOW status into |
| * account |
| * |
| * This function is to be called from contexts that can sleep. |
| */ |
| void gpiod_set_value_cansleep(struct gpio_desc *desc, int value) |
| { |
| might_sleep_if(extra_checks); |
| VALIDATE_DESC_VOID(desc); |
| gpiod_set_value_nocheck(desc, value); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_value_cansleep); |
| |
| /** |
| * gpiod_set_raw_array_value_cansleep() - assign values to an array of GPIOs |
| * @array_size: number of elements in the descriptor array / value bitmap |
| * @desc_array: array of GPIO descriptors whose values will be assigned |
| * @array_info: information on applicability of fast bitmap processing path |
| * @value_bitmap: bitmap of values to assign |
| * |
| * Set the raw values of the GPIOs, i.e. the values of the physical lines |
| * without regard for their ACTIVE_LOW status. |
| * |
| * This function is to be called from contexts that can sleep. |
| */ |
| int gpiod_set_raw_array_value_cansleep(unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| might_sleep_if(extra_checks); |
| if (!desc_array) |
| return -EINVAL; |
| return gpiod_set_array_value_complex(true, true, array_size, desc_array, |
| array_info, value_bitmap); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_raw_array_value_cansleep); |
| |
| /** |
| * gpiod_add_lookup_tables() - register GPIO device consumers |
| * @tables: list of tables of consumers to register |
| * @n: number of tables in the list |
| */ |
| void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) |
| { |
| unsigned int i; |
| |
| mutex_lock(&gpio_lookup_lock); |
| |
| for (i = 0; i < n; i++) |
| list_add_tail(&tables[i]->list, &gpio_lookup_list); |
| |
| mutex_unlock(&gpio_lookup_lock); |
| } |
| |
| /** |
| * gpiod_set_array_value_cansleep() - assign values to an array of GPIOs |
| * @array_size: number of elements in the descriptor array / value bitmap |
| * @desc_array: array of GPIO descriptors whose values will be assigned |
| * @array_info: information on applicability of fast bitmap processing path |
| * @value_bitmap: bitmap of values to assign |
| * |
| * Set the logical values of the GPIOs, i.e. taking their ACTIVE_LOW status |
| * into account. |
| * |
| * This function is to be called from contexts that can sleep. |
| */ |
| int gpiod_set_array_value_cansleep(unsigned int array_size, |
| struct gpio_desc **desc_array, |
| struct gpio_array *array_info, |
| unsigned long *value_bitmap) |
| { |
| might_sleep_if(extra_checks); |
| if (!desc_array) |
| return -EINVAL; |
| return gpiod_set_array_value_complex(false, true, array_size, |
| desc_array, array_info, |
| value_bitmap); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_set_array_value_cansleep); |
| |
| /** |
| * gpiod_add_lookup_table() - register GPIO device consumers |
| * @table: table of consumers to register |
| */ |
| void gpiod_add_lookup_table(struct gpiod_lookup_table *table) |
| { |
| gpiod_add_lookup_tables(&table, 1); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_add_lookup_table); |
| |
| /** |
| * gpiod_remove_lookup_table() - unregister GPIO device consumers |
| * @table: table of consumers to unregister |
| */ |
| void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) |
| { |
| /* Nothing to remove */ |
| if (!table) |
| return; |
| |
| mutex_lock(&gpio_lookup_lock); |
| |
| list_del(&table->list); |
| |
| mutex_unlock(&gpio_lookup_lock); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_remove_lookup_table); |
| |
| /** |
| * gpiod_add_hogs() - register a set of GPIO hogs from machine code |
| * @hogs: table of gpio hog entries with a zeroed sentinel at the end |
| */ |
| void gpiod_add_hogs(struct gpiod_hog *hogs) |
| { |
| struct gpio_chip *gc; |
| struct gpiod_hog *hog; |
| |
| mutex_lock(&gpio_machine_hogs_mutex); |
| |
| for (hog = &hogs[0]; hog->chip_label; hog++) { |
| list_add_tail(&hog->list, &gpio_machine_hogs); |
| |
| /* |
| * The chip may have been registered earlier, so check if it |
| * exists and, if so, try to hog the line now. |
| */ |
| gc = find_chip_by_name(hog->chip_label); |
| if (gc) |
| gpiochip_machine_hog(gc, hog); |
| } |
| |
| mutex_unlock(&gpio_machine_hogs_mutex); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_add_hogs); |
| |
| void gpiod_remove_hogs(struct gpiod_hog *hogs) |
| { |
| struct gpiod_hog *hog; |
| |
| mutex_lock(&gpio_machine_hogs_mutex); |
| for (hog = &hogs[0]; hog->chip_label; hog++) |
| list_del(&hog->list); |
| mutex_unlock(&gpio_machine_hogs_mutex); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_remove_hogs); |
| |
| static struct gpiod_lookup_table *gpiod_find_lookup_table(struct device *dev) |
| { |
| const char *dev_id = dev ? dev_name(dev) : NULL; |
| struct gpiod_lookup_table *table; |
| |
| mutex_lock(&gpio_lookup_lock); |
| |
| list_for_each_entry(table, &gpio_lookup_list, list) { |
| if (table->dev_id && dev_id) { |
| /* |
| * Valid strings on both ends, must be identical to have |
| * a match |
| */ |
| if (!strcmp(table->dev_id, dev_id)) |
| goto found; |
| } else { |
| /* |
| * One of the pointers is NULL, so both must be to have |
| * a match |
| */ |
| if (dev_id == table->dev_id) |
| goto found; |
| } |
| } |
| table = NULL; |
| |
| found: |
| mutex_unlock(&gpio_lookup_lock); |
| return table; |
| } |
| |
| static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id, |
| unsigned int idx, unsigned long *flags) |
| { |
| struct gpio_desc *desc = ERR_PTR(-ENOENT); |
| struct gpiod_lookup_table *table; |
| struct gpiod_lookup *p; |
| |
| table = gpiod_find_lookup_table(dev); |
| if (!table) |
| return desc; |
| |
| for (p = &table->table[0]; p->key; p++) { |
| struct gpio_chip *gc; |
| |
| /* idx must always match exactly */ |
| if (p->idx != idx) |
| continue; |
| |
| /* If the lookup entry has a con_id, require exact match */ |
| if (p->con_id && (!con_id || strcmp(p->con_id, con_id))) |
| continue; |
| |
| if (p->chip_hwnum == U16_MAX) { |
| desc = gpio_name_to_desc(p->key); |
| if (desc) { |
| *flags = p->flags; |
| return desc; |
| } |
| |
| dev_warn(dev, "cannot find GPIO line %s, deferring\n", |
| p->key); |
| return ERR_PTR(-EPROBE_DEFER); |
| } |
| |
| gc = find_chip_by_name(p->key); |
| |
| if (!gc) { |
| /* |
| * As the lookup table indicates a chip with |
| * p->key should exist, assume it may |
| * still appear later and let the interested |
| * consumer be probed again or let the Deferred |
| * Probe infrastructure handle the error. |
| */ |
| dev_warn(dev, "cannot find GPIO chip %s, deferring\n", |
| p->key); |
| return ERR_PTR(-EPROBE_DEFER); |
| } |
| |
| if (gc->ngpio <= p->chip_hwnum) { |
| dev_err(dev, |
| "requested GPIO %u (%u) is out of range [0..%u] for chip %s\n", |
| idx, p->chip_hwnum, gc->ngpio - 1, |
| gc->label); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| desc = gpiochip_get_desc(gc, p->chip_hwnum); |
| *flags = p->flags; |
| |
| return desc; |
| } |
| |
| return desc; |
| } |
| |
| static int platform_gpio_count(struct device *dev, const char *con_id) |
| { |
| struct gpiod_lookup_table *table; |
| struct gpiod_lookup *p; |
| unsigned int count = 0; |
| |
| table = gpiod_find_lookup_table(dev); |
| if (!table) |
| return -ENOENT; |
| |
| for (p = &table->table[0]; p->key; p++) { |
| if ((con_id && p->con_id && !strcmp(con_id, p->con_id)) || |
| (!con_id && !p->con_id)) |
| count++; |
| } |
| if (!count) |
| return -ENOENT; |
| |
| return count; |
| } |
| |
| /** |
| * fwnode_gpiod_get_index - obtain a GPIO from firmware node |
| * @fwnode: handle of the firmware node |
| * @con_id: function within the GPIO consumer |
| * @index: index of the GPIO to obtain for the consumer |
| * @flags: GPIO initialization flags |
| * @label: label to attach to the requested GPIO |
| * |
| * This function can be used for drivers that get their configuration |
| * from opaque firmware. |
| * |
| * The function properly finds the corresponding GPIO using whatever is the |
| * underlying firmware interface and then makes sure that the GPIO |
| * descriptor is requested before it is returned to the caller. |
| * |
| * Returns: |
| * On successful request the GPIO pin is configured in accordance with |
| * provided @flags. |
| * |
| * In case of error an ERR_PTR() is returned. |
| */ |
| struct gpio_desc *fwnode_gpiod_get_index(struct fwnode_handle *fwnode, |
| const char *con_id, int index, |
| enum gpiod_flags flags, |
| const char *label) |
| { |
| struct gpio_desc *desc; |
| char prop_name[32]; /* 32 is max size of property name */ |
| unsigned int i; |
| |
| for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) { |
| if (con_id) |
| snprintf(prop_name, sizeof(prop_name), "%s-%s", |
| con_id, gpio_suffixes[i]); |
| else |
| snprintf(prop_name, sizeof(prop_name), "%s", |
| gpio_suffixes[i]); |
| |
| desc = fwnode_get_named_gpiod(fwnode, prop_name, index, flags, |
| label); |
| if (!gpiod_not_found(desc)) |
| break; |
| } |
| |
| return desc; |
| } |
| EXPORT_SYMBOL_GPL(fwnode_gpiod_get_index); |
| |
| /** |
| * gpiod_count - return the number of GPIOs associated with a device / function |
| * or -ENOENT if no GPIO has been assigned to the requested function |
| * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| * @con_id: function within the GPIO consumer |
| */ |
| int gpiod_count(struct device *dev, const char *con_id) |
| { |
| const struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; |
| int count = -ENOENT; |
| |
| if (is_of_node(fwnode)) |
| count = of_gpio_get_count(dev, con_id); |
| else if (is_acpi_node(fwnode)) |
| count = acpi_gpio_count(dev, con_id); |
| |
| if (count < 0) |
| count = platform_gpio_count(dev, con_id); |
| |
| return count; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_count); |
| |
| /** |
| * gpiod_get - obtain a GPIO for a given GPIO function |
| * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| * @con_id: function within the GPIO consumer |
| * @flags: optional GPIO initialization flags |
| * |
| * Return the GPIO descriptor corresponding to the function con_id of device |
| * dev, -ENOENT if no GPIO has been assigned to the requested function, or |
| * another IS_ERR() code if an error occurred while trying to acquire the GPIO. |
| */ |
| struct gpio_desc *__must_check gpiod_get(struct device *dev, const char *con_id, |
| enum gpiod_flags flags) |
| { |
| return gpiod_get_index(dev, con_id, 0, flags); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get); |
| |
| /** |
| * gpiod_get_optional - obtain an optional GPIO for a given GPIO function |
| * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| * @con_id: function within the GPIO consumer |
| * @flags: optional GPIO initialization flags |
| * |
| * This is equivalent to gpiod_get(), except that when no GPIO was assigned to |
| * the requested function it will return NULL. This is convenient for drivers |
| * that need to handle optional GPIOs. |
| */ |
| struct gpio_desc *__must_check gpiod_get_optional(struct device *dev, |
| const char *con_id, |
| enum gpiod_flags flags) |
| { |
| return gpiod_get_index_optional(dev, con_id, 0, flags); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_optional); |
| |
| |
| /** |
| * gpiod_configure_flags - helper function to configure a given GPIO |
| * @desc: gpio whose value will be assigned |
| * @con_id: function within the GPIO consumer |
| * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from |
| * of_find_gpio() or of_get_gpio_hog() |
| * @dflags: gpiod_flags - optional GPIO initialization flags |
| * |
| * Return 0 on success, -ENOENT if no GPIO has been assigned to the |
| * requested function and/or index, or another IS_ERR() code if an error |
| * occurred while trying to acquire the GPIO. |
| */ |
| int gpiod_configure_flags(struct gpio_desc *desc, const char *con_id, |
| unsigned long lflags, enum gpiod_flags dflags) |
| { |
| int ret; |
| |
| if (lflags & GPIO_ACTIVE_LOW) |
| set_bit(FLAG_ACTIVE_LOW, &desc->flags); |
| |
| if (lflags & GPIO_OPEN_DRAIN) |
| set_bit(FLAG_OPEN_DRAIN, &desc->flags); |
| else if (dflags & GPIOD_FLAGS_BIT_OPEN_DRAIN) { |
| /* |
| * This enforces open drain mode from the consumer side. |
| * This is necessary for some busses like I2C, but the lookup |
| * should *REALLY* have specified them as open drain in the |
| * first place, so print a little warning here. |
| */ |
| set_bit(FLAG_OPEN_DRAIN, &desc->flags); |
| gpiod_warn(desc, |
| "enforced open drain please flag it properly in DT/ACPI DSDT/board file\n"); |
| } |
| |
| if (lflags & GPIO_OPEN_SOURCE) |
| set_bit(FLAG_OPEN_SOURCE, &desc->flags); |
| |
| if ((lflags & GPIO_PULL_UP) && (lflags & GPIO_PULL_DOWN)) { |
| gpiod_err(desc, |
| "both pull-up and pull-down enabled, invalid configuration\n"); |
| return -EINVAL; |
| } |
| |
| if (lflags & GPIO_PULL_UP) |
| set_bit(FLAG_PULL_UP, &desc->flags); |
| else if (lflags & GPIO_PULL_DOWN) |
| set_bit(FLAG_PULL_DOWN, &desc->flags); |
| |
| ret = gpiod_set_transitory(desc, (lflags & GPIO_TRANSITORY)); |
| if (ret < 0) |
| return ret; |
| |
| /* No particular flag request, return here... */ |
| if (!(dflags & GPIOD_FLAGS_BIT_DIR_SET)) { |
| gpiod_dbg(desc, "no flags found for %s\n", con_id); |
| return 0; |
| } |
| |
| /* Process flags */ |
| if (dflags & GPIOD_FLAGS_BIT_DIR_OUT) |
| ret = gpiod_direction_output(desc, |
| !!(dflags & GPIOD_FLAGS_BIT_DIR_VAL)); |
| else |
| ret = gpiod_direction_input(desc); |
| |
| return ret; |
| } |
| |
| /** |
| * gpiod_get_index - obtain a GPIO from a multi-index GPIO function |
| * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| * @con_id: function within the GPIO consumer |
| * @idx: index of the GPIO to obtain in the consumer |
| * @flags: optional GPIO initialization flags |
| * |
| * This variant of gpiod_get() allows to access GPIOs other than the first |
| * defined one for functions that define several GPIOs. |
| * |
| * Return a valid GPIO descriptor, -ENOENT if no GPIO has been assigned to the |
| * requested function and/or index, or another IS_ERR() code if an error |
| * occurred while trying to acquire the GPIO. |
| */ |
| struct gpio_desc *__must_check gpiod_get_index(struct device *dev, |
| const char *con_id, |
| unsigned int idx, |
| enum gpiod_flags flags) |
| { |
| unsigned long lookupflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
| struct gpio_desc *desc = NULL; |
| int ret; |
| /* Maybe we have a device name, maybe not */ |
| const char *devname = dev ? dev_name(dev) : "?"; |
| const struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL; |
| |
| dev_dbg(dev, "GPIO lookup for consumer %s\n", con_id); |
| |
| /* Using device tree? */ |
| if (is_of_node(fwnode)) { |
| dev_dbg(dev, "using device tree for GPIO lookup\n"); |
| desc = of_find_gpio(dev, con_id, idx, &lookupflags); |
| } else if (is_acpi_node(fwnode)) { |
| dev_dbg(dev, "using ACPI for GPIO lookup\n"); |
| desc = acpi_find_gpio(dev, con_id, idx, &flags, &lookupflags); |
| } |
| |
| /* |
| * Either we are not using DT or ACPI, or their lookup did not return |
| * a result. In that case, use platform lookup as a fallback. |
| */ |
| if (!desc || gpiod_not_found(desc)) { |
| dev_dbg(dev, "using lookup tables for GPIO lookup\n"); |
| desc = gpiod_find(dev, con_id, idx, &lookupflags); |
| } |
| |
| if (IS_ERR(desc)) { |
| dev_dbg(dev, "No GPIO consumer %s found\n", con_id); |
| return desc; |
| } |
| |
| /* |
| * If a connection label was passed use that, else attempt to use |
| * the device name as label |
| */ |
| ret = gpiod_request(desc, con_id ? con_id : devname); |
| if (ret) { |
| if (ret == -EBUSY && flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE) { |
| /* |
| * This happens when there are several consumers for |
| * the same GPIO line: we just return here without |
| * further initialization. It is a bit if a hack. |
| * This is necessary to support fixed regulators. |
| * |
| * FIXME: Make this more sane and safe. |
| */ |
| dev_info(dev, "nonexclusive access to GPIO for %s\n", |
| con_id ? con_id : devname); |
| return desc; |
| } else { |
| return ERR_PTR(ret); |
| } |
| } |
| |
| ret = gpiod_configure_flags(desc, con_id, lookupflags, flags); |
| if (ret < 0) { |
| dev_dbg(dev, "setup of GPIO %s failed\n", con_id); |
| gpiod_put(desc); |
| return ERR_PTR(ret); |
| } |
| |
| blocking_notifier_call_chain(&desc->gdev->notifier, |
| GPIOLINE_CHANGED_REQUESTED, desc); |
| |
| return desc; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_index); |
| |
| /** |
| * fwnode_get_named_gpiod - obtain a GPIO from firmware node |
| * @fwnode: handle of the firmware node |
| * @propname: name of the firmware property representing the GPIO |
| * @index: index of the GPIO to obtain for the consumer |
| * @dflags: GPIO initialization flags |
| * @label: label to attach to the requested GPIO |
| * |
| * This function can be used for drivers that get their configuration |
| * from opaque firmware. |
| * |
| * The function properly finds the corresponding GPIO using whatever is the |
| * underlying firmware interface and then makes sure that the GPIO |
| * descriptor is requested before it is returned to the caller. |
| * |
| * Returns: |
| * On successful request the GPIO pin is configured in accordance with |
| * provided @dflags. |
| * |
| * In case of error an ERR_PTR() is returned. |
| */ |
| struct gpio_desc *fwnode_get_named_gpiod(struct fwnode_handle *fwnode, |
| const char *propname, int index, |
| enum gpiod_flags dflags, |
| const char *label) |
| { |
| unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT; |
| struct gpio_desc *desc = ERR_PTR(-ENODEV); |
| int ret; |
| |
| if (is_of_node(fwnode)) { |
| desc = gpiod_get_from_of_node(to_of_node(fwnode), |
| propname, index, |
| dflags, |
| label); |
| return desc; |
| } else if (is_acpi_node(fwnode)) { |
| struct acpi_gpio_info info; |
| |
| desc = acpi_node_get_gpiod(fwnode, propname, index, &info); |
| if (IS_ERR(desc)) |
| return desc; |
| |
| acpi_gpio_update_gpiod_flags(&dflags, &info); |
| acpi_gpio_update_gpiod_lookup_flags(&lflags, &info); |
| } else |
| return ERR_PTR(-EINVAL); |
| |
| /* Currently only ACPI takes this path */ |
| ret = gpiod_request(desc, label); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| ret = gpiod_configure_flags(desc, propname, lflags, dflags); |
| if (ret < 0) { |
| gpiod_put(desc); |
| return ERR_PTR(ret); |
| } |
| |
| blocking_notifier_call_chain(&desc->gdev->notifier, |
| GPIOLINE_CHANGED_REQUESTED, desc); |
| |
| return desc; |
| } |
| EXPORT_SYMBOL_GPL(fwnode_get_named_gpiod); |
| |
| /** |
| * gpiod_get_index_optional - obtain an optional GPIO from a multi-index GPIO |
| * function |
| * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| * @con_id: function within the GPIO consumer |
| * @index: index of the GPIO to obtain in the consumer |
| * @flags: optional GPIO initialization flags |
| * |
| * This is equivalent to gpiod_get_index(), except that when no GPIO with the |
| * specified index was assigned to the requested function it will return NULL. |
| * This is convenient for drivers that need to handle optional GPIOs. |
| */ |
| struct gpio_desc *__must_check gpiod_get_index_optional(struct device *dev, |
| const char *con_id, |
| unsigned int index, |
| enum gpiod_flags flags) |
| { |
| struct gpio_desc *desc; |
| |
| desc = gpiod_get_index(dev, con_id, index, flags); |
| if (gpiod_not_found(desc)) |
| return NULL; |
| |
| return desc; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_index_optional); |
| |
| /** |
| * gpiod_hog - Hog the specified GPIO desc given the provided flags |
| * @desc: gpio whose value will be assigned |
| * @name: gpio line name |
| * @lflags: bitmask of gpio_lookup_flags GPIO_* values - returned from |
| * of_find_gpio() or of_get_gpio_hog() |
| * @dflags: gpiod_flags - optional GPIO initialization flags |
| */ |
| int gpiod_hog(struct gpio_desc *desc, const char *name, |
| unsigned long lflags, enum gpiod_flags dflags) |
| { |
| struct gpio_chip *gc; |
| struct gpio_desc *local_desc; |
| int hwnum; |
| int ret; |
| |
| gc = gpiod_to_chip(desc); |
| hwnum = gpio_chip_hwgpio(desc); |
| |
| local_desc = gpiochip_request_own_desc(gc, hwnum, name, |
| lflags, dflags); |
| if (IS_ERR(local_desc)) { |
| ret = PTR_ERR(local_desc); |
| pr_err("requesting hog GPIO %s (chip %s, offset %d) failed, %d\n", |
| name, gc->label, hwnum, ret); |
| return ret; |
| } |
| |
| /* Mark GPIO as hogged so it can be identified and removed later */ |
| set_bit(FLAG_IS_HOGGED, &desc->flags); |
| |
| gpiod_info(desc, "hogged as %s%s\n", |
| (dflags & GPIOD_FLAGS_BIT_DIR_OUT) ? "output" : "input", |
| (dflags & GPIOD_FLAGS_BIT_DIR_OUT) ? |
| (dflags & GPIOD_FLAGS_BIT_DIR_VAL) ? "/high" : "/low" : ""); |
| |
| return 0; |
| } |
| |
| /** |
| * gpiochip_free_hogs - Scan gpio-controller chip and release GPIO hog |
| * @gc: gpio chip to act on |
| */ |
| static void gpiochip_free_hogs(struct gpio_chip *gc) |
| { |
| int id; |
| |
| for (id = 0; id < gc->ngpio; id++) { |
| if (test_bit(FLAG_IS_HOGGED, &gc->gpiodev->descs[id].flags)) |
| gpiochip_free_own_desc(&gc->gpiodev->descs[id]); |
| } |
| } |
| |
| /** |
| * gpiod_get_array - obtain multiple GPIOs from a multi-index GPIO function |
| * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| * @con_id: function within the GPIO consumer |
| * @flags: optional GPIO initialization flags |
| * |
| * This function acquires all the GPIOs defined under a given function. |
| * |
| * Return a struct gpio_descs containing an array of descriptors, -ENOENT if |
| * no GPIO has been assigned to the requested function, or another IS_ERR() |
| * code if an error occurred while trying to acquire the GPIOs. |
| */ |
| struct gpio_descs *__must_check gpiod_get_array(struct device *dev, |
| const char *con_id, |
| enum gpiod_flags flags) |
| { |
| struct gpio_desc *desc; |
| struct gpio_descs *descs; |
| struct gpio_array *array_info = NULL; |
| struct gpio_chip *gc; |
| int count, bitmap_size; |
| |
| count = gpiod_count(dev, con_id); |
| if (count < 0) |
| return ERR_PTR(count); |
| |
| descs = kzalloc(struct_size(descs, desc, count), GFP_KERNEL); |
| if (!descs) |
| return ERR_PTR(-ENOMEM); |
| |
| for (descs->ndescs = 0; descs->ndescs < count; ) { |
| desc = gpiod_get_index(dev, con_id, descs->ndescs, flags); |
| if (IS_ERR(desc)) { |
| gpiod_put_array(descs); |
| return ERR_CAST(desc); |
| } |
| |
| descs->desc[descs->ndescs] = desc; |
| |
| gc = gpiod_to_chip(desc); |
| /* |
| * If pin hardware number of array member 0 is also 0, select |
| * its chip as a candidate for fast bitmap processing path. |
| */ |
| if (descs->ndescs == 0 && gpio_chip_hwgpio(desc) == 0) { |
| struct gpio_descs *array; |
| |
| bitmap_size = BITS_TO_LONGS(gc->ngpio > count ? |
| gc->ngpio : count); |
| |
| array = kzalloc(struct_size(descs, desc, count) + |
| struct_size(array_info, invert_mask, |
| 3 * bitmap_size), GFP_KERNEL); |
| if (!array) { |
| gpiod_put_array(descs); |
| return ERR_PTR(-ENOMEM); |
| } |
| |
| memcpy(array, descs, |
| struct_size(descs, desc, descs->ndescs + 1)); |
| kfree(descs); |
| |
| descs = array; |
| array_info = (void *)(descs->desc + count); |
| array_info->get_mask = array_info->invert_mask + |
| bitmap_size; |
| array_info->set_mask = array_info->get_mask + |
| bitmap_size; |
| |
| array_info->desc = descs->desc; |
| array_info->size = count; |
| array_info->chip = gc; |
| bitmap_set(array_info->get_mask, descs->ndescs, |
| count - descs->ndescs); |
| bitmap_set(array_info->set_mask, descs->ndescs, |
| count - descs->ndescs); |
| descs->info = array_info; |
| } |
| /* Unmark array members which don't belong to the 'fast' chip */ |
| if (array_info && array_info->chip != gc) { |
| __clear_bit(descs->ndescs, array_info->get_mask); |
| __clear_bit(descs->ndescs, array_info->set_mask); |
| } |
| /* |
| * Detect array members which belong to the 'fast' chip |
| * but their pins are not in hardware order. |
| */ |
| else if (array_info && |
| gpio_chip_hwgpio(desc) != descs->ndescs) { |
| /* |
| * Don't use fast path if all array members processed so |
| * far belong to the same chip as this one but its pin |
| * hardware number is different from its array index. |
| */ |
| if (bitmap_full(array_info->get_mask, descs->ndescs)) { |
| array_info = NULL; |
| } else { |
| __clear_bit(descs->ndescs, |
| array_info->get_mask); |
| __clear_bit(descs->ndescs, |
| array_info->set_mask); |
| } |
| } else if (array_info) { |
| /* Exclude open drain or open source from fast output */ |
| if (gpiochip_line_is_open_drain(gc, descs->ndescs) || |
| gpiochip_line_is_open_source(gc, descs->ndescs)) |
| __clear_bit(descs->ndescs, |
| array_info->set_mask); |
| /* Identify 'fast' pins which require invertion */ |
| if (gpiod_is_active_low(desc)) |
| __set_bit(descs->ndescs, |
| array_info->invert_mask); |
| } |
| |
| descs->ndescs++; |
| } |
| if (array_info) |
| dev_dbg(dev, |
| "GPIO array info: chip=%s, size=%d, get_mask=%lx, set_mask=%lx, invert_mask=%lx\n", |
| array_info->chip->label, array_info->size, |
| *array_info->get_mask, *array_info->set_mask, |
| *array_info->invert_mask); |
| return descs; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_array); |
| |
| /** |
| * gpiod_get_array_optional - obtain multiple GPIOs from a multi-index GPIO |
| * function |
| * @dev: GPIO consumer, can be NULL for system-global GPIOs |
| * @con_id: function within the GPIO consumer |
| * @flags: optional GPIO initialization flags |
| * |
| * This is equivalent to gpiod_get_array(), except that when no GPIO was |
| * assigned to the requested function it will return NULL. |
| */ |
| struct gpio_descs *__must_check gpiod_get_array_optional(struct device *dev, |
| const char *con_id, |
| enum gpiod_flags flags) |
| { |
| struct gpio_descs *descs; |
| |
| descs = gpiod_get_array(dev, con_id, flags); |
| if (gpiod_not_found(descs)) |
| return NULL; |
| |
| return descs; |
| } |
| EXPORT_SYMBOL_GPL(gpiod_get_array_optional); |
| |
| /** |
| * gpiod_put - dispose of a GPIO descriptor |
| * @desc: GPIO descriptor to dispose of |
| * |
| * No descriptor can be used after gpiod_put() has been called on it. |
| */ |
| void gpiod_put(struct gpio_desc *desc) |
| { |
| if (desc) |
| gpiod_free(desc); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_put); |
| |
| /** |
| * gpiod_put_array - dispose of multiple GPIO descriptors |
| * @descs: struct gpio_descs containing an array of descriptors |
| */ |
| void gpiod_put_array(struct gpio_descs *descs) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < descs->ndescs; i++) |
| gpiod_put(descs->desc[i]); |
| |
| kfree(descs); |
| } |
| EXPORT_SYMBOL_GPL(gpiod_put_array); |
| |
| |
| static int gpio_bus_match(struct device *dev, struct device_driver *drv) |
| { |
| struct fwnode_handle *fwnode = dev_fwnode(dev); |
| |
| /* |
| * Only match if the fwnode doesn't already have a proper struct device |
| * created for it. |
| */ |
| if (fwnode && fwnode->dev != dev) |
| return 0; |
| return 1; |
| } |
| |
| static int gpio_stub_drv_probe(struct device *dev) |
| { |
| /* |
| * The DT node of some GPIO chips have a "compatible" property, but |
| * never have a struct device added and probed by a driver to register |
| * the GPIO chip with gpiolib. In such cases, fw_devlink=on will cause |
| * the consumers of the GPIO chip to get probe deferred forever because |
| * they will be waiting for a device associated with the GPIO chip |
| * firmware node to get added and bound to a driver. |
| * |
| * To allow these consumers to probe, we associate the struct |
| * gpio_device of the GPIO chip with the firmware node and then simply |
| * bind it to this stub driver. |
| */ |
| return 0; |
| } |
| |
| static struct device_driver gpio_stub_drv = { |
| .name = "gpio_stub_drv", |
| .bus = &gpio_bus_type, |
| .probe = gpio_stub_drv_probe, |
| }; |
| |
| static int __init gpiolib_dev_init(void) |
| { |
| int ret; |
| |
| /* Register GPIO sysfs bus */ |
| ret = bus_register(&gpio_bus_type); |
| if (ret < 0) { |
| pr_err("gpiolib: could not register GPIO bus type\n"); |
| return ret; |
| } |
| |
| ret = driver_register(&gpio_stub_drv); |
| if (ret < 0) { |
| pr_err("gpiolib: could not register GPIO stub driver\n"); |
| bus_unregister(&gpio_bus_type); |
| return ret; |
| } |
| |
| ret = alloc_chrdev_region(&gpio_devt, 0, GPIO_DEV_MAX, GPIOCHIP_NAME); |
| if (ret < 0) { |
| pr_err("gpiolib: failed to allocate char dev region\n"); |
| driver_unregister(&gpio_stub_drv); |
| bus_unregister(&gpio_bus_type); |
| return ret; |
| } |
| |
| gpiolib_initialized = true; |
| gpiochip_setup_devs(); |
| |
| #if IS_ENABLED(CONFIG_OF_DYNAMIC) && IS_ENABLED(CONFIG_OF_GPIO) |
| WARN_ON(of_reconfig_notifier_register(&gpio_of_notifier)); |
| #endif /* CONFIG_OF_DYNAMIC && CONFIG_OF_GPIO */ |
| |
| return ret; |
| } |
| core_initcall(gpiolib_dev_init); |
| |
| #ifdef CONFIG_DEBUG_FS |
| |
| static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev) |
| { |
| unsigned i; |
| struct gpio_chip *gc = gdev->chip; |
| unsigned gpio = gdev->base; |
| struct gpio_desc *gdesc = &gdev->descs[0]; |
| bool is_out; |
| bool is_irq; |
| bool active_low; |
| |
| for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) { |
| if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) { |
| if (gdesc->name) { |
| seq_printf(s, " gpio-%-3d (%-20.20s)\n", |
| gpio, gdesc->name); |
| } |
| continue; |
| } |
| |
| gpiod_get_direction(gdesc); |
| is_out = test_bit(FLAG_IS_OUT, &gdesc->flags); |
| is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags); |
| active_low = test_bit(FLAG_ACTIVE_LOW, &gdesc->flags); |
| seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s", |
| gpio, gdesc->name ? gdesc->name : "", gdesc->label, |
| is_out ? "out" : "in ", |
| gc->get ? (gc->get(gc, i) ? "hi" : "lo") : "? ", |
| is_irq ? "IRQ " : "", |
| active_low ? "ACTIVE LOW" : ""); |
| seq_printf(s, "\n"); |
| } |
| } |
| |
| static void *gpiolib_seq_start(struct seq_file *s, loff_t *pos) |
| { |
| unsigned long flags; |
| struct gpio_device *gdev = NULL; |
| loff_t index = *pos; |
| |
| s->private = ""; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| list_for_each_entry(gdev, &gpio_devices, list) |
| if (index-- == 0) { |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| return gdev; |
| } |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| |
| return NULL; |
| } |
| |
| static void *gpiolib_seq_next(struct seq_file *s, void *v, loff_t *pos) |
| { |
| unsigned long flags; |
| struct gpio_device *gdev = v; |
| void *ret = NULL; |
| |
| spin_lock_irqsave(&gpio_lock, flags); |
| if (list_is_last(&gdev->list, &gpio_devices)) |
| ret = NULL; |
| else |
| ret = list_entry(gdev->list.next, struct gpio_device, list); |
| spin_unlock_irqrestore(&gpio_lock, flags); |
| |
| s->private = "\n"; |
| ++*pos; |
| |
| return ret; |
| } |
| |
| static void gpiolib_seq_stop(struct seq_file *s, void *v) |
| { |
| } |
| |
| static int gpiolib_seq_show(struct seq_file *s, void *v) |
| { |
| struct gpio_device *gdev = v; |
| struct gpio_chip *gc = gdev->chip; |
| struct device *parent; |
| |
| if (!gc) { |
| seq_printf(s, "%s%s: (dangling chip)", (char *)s->private, |
| dev_name(&gdev->dev)); |
| return 0; |
| } |
| |
| seq_printf(s, "%s%s: GPIOs %d-%d", (char *)s->private, |
| dev_name(&gdev->dev), |
| gdev->base, gdev->base + gdev->ngpio - 1); |
| parent = gc->parent; |
| if (parent) |
| seq_printf(s, ", parent: %s/%s", |
| parent->bus ? parent->bus->name : "no-bus", |
| dev_name(parent)); |
| if (gc->label) |
| seq_printf(s, ", %s", gc->label); |
| if (gc->can_sleep) |
| seq_printf(s, ", can sleep"); |
| seq_printf(s, ":\n"); |
| |
| if (gc->dbg_show) |
| gc->dbg_show(s, gc); |
| else |
| gpiolib_dbg_show(s, gdev); |
| |
| return 0; |
| } |
| |
| static const struct seq_operations gpiolib_sops = { |
| .start = gpiolib_seq_start, |
| .next = gpiolib_seq_next, |
| .stop = gpiolib_seq_stop, |
| .show = gpiolib_seq_show, |
| }; |
| DEFINE_SEQ_ATTRIBUTE(gpiolib); |
| |
| static int __init gpiolib_debugfs_init(void) |
| { |
| /* /sys/kernel/debug/gpio */ |
| debugfs_create_file("gpio", 0444, NULL, NULL, &gpiolib_fops); |
| return 0; |
| } |
| subsys_initcall(gpiolib_debugfs_init); |
| |
| #endif /* DEBUG_FS */ |