| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Core driver for the pin control subsystem |
| * |
| * Copyright (C) 2011-2012 ST-Ericsson SA |
| * Written on behalf of Linaro for ST-Ericsson |
| * Based on bits of regulator core, gpio core and clk core |
| * |
| * Author: Linus Walleij <linus.walleij@linaro.org> |
| * |
| * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. |
| */ |
| #define pr_fmt(fmt) "pinctrl core: " fmt |
| |
| #include <linux/kernel.h> |
| #include <linux/kref.h> |
| #include <linux/export.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/slab.h> |
| #include <linux/err.h> |
| #include <linux/list.h> |
| #include <linux/debugfs.h> |
| #include <linux/seq_file.h> |
| #include <linux/pinctrl/consumer.h> |
| #include <linux/pinctrl/pinctrl.h> |
| #include <linux/pinctrl/machine.h> |
| |
| #ifdef CONFIG_GPIOLIB |
| #include "../gpio/gpiolib.h" |
| #include <asm-generic/gpio.h> |
| #endif |
| |
| #include "core.h" |
| #include "devicetree.h" |
| #include "pinmux.h" |
| #include "pinconf.h" |
| |
| |
| static bool pinctrl_dummy_state; |
| |
| /* Mutex taken to protect pinctrl_list */ |
| static DEFINE_MUTEX(pinctrl_list_mutex); |
| |
| /* Mutex taken to protect pinctrl_maps */ |
| DEFINE_MUTEX(pinctrl_maps_mutex); |
| |
| /* Mutex taken to protect pinctrldev_list */ |
| static DEFINE_MUTEX(pinctrldev_list_mutex); |
| |
| /* Global list of pin control devices (struct pinctrl_dev) */ |
| static LIST_HEAD(pinctrldev_list); |
| |
| /* List of pin controller handles (struct pinctrl) */ |
| static LIST_HEAD(pinctrl_list); |
| |
| /* List of pinctrl maps (struct pinctrl_maps) */ |
| LIST_HEAD(pinctrl_maps); |
| |
| |
| /** |
| * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support |
| * |
| * Usually this function is called by platforms without pinctrl driver support |
| * but run with some shared drivers using pinctrl APIs. |
| * After calling this function, the pinctrl core will return successfully |
| * with creating a dummy state for the driver to keep going smoothly. |
| */ |
| void pinctrl_provide_dummies(void) |
| { |
| pinctrl_dummy_state = true; |
| } |
| |
| const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev) |
| { |
| /* We're not allowed to register devices without name */ |
| return pctldev->desc->name; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_dev_get_name); |
| |
| const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev) |
| { |
| return dev_name(pctldev->dev); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname); |
| |
| void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev) |
| { |
| return pctldev->driver_data; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata); |
| |
| /** |
| * get_pinctrl_dev_from_devname() - look up pin controller device |
| * @devname: the name of a device instance, as returned by dev_name() |
| * |
| * Looks up a pin control device matching a certain device name or pure device |
| * pointer, the pure device pointer will take precedence. |
| */ |
| struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname) |
| { |
| struct pinctrl_dev *pctldev; |
| |
| if (!devname) |
| return NULL; |
| |
| mutex_lock(&pinctrldev_list_mutex); |
| |
| list_for_each_entry(pctldev, &pinctrldev_list, node) { |
| if (!strcmp(dev_name(pctldev->dev), devname)) { |
| /* Matched on device name */ |
| mutex_unlock(&pinctrldev_list_mutex); |
| return pctldev; |
| } |
| } |
| |
| mutex_unlock(&pinctrldev_list_mutex); |
| |
| return NULL; |
| } |
| |
| struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np) |
| { |
| struct pinctrl_dev *pctldev; |
| |
| mutex_lock(&pinctrldev_list_mutex); |
| |
| list_for_each_entry(pctldev, &pinctrldev_list, node) |
| if (pctldev->dev->of_node == np) { |
| mutex_unlock(&pinctrldev_list_mutex); |
| return pctldev; |
| } |
| |
| mutex_unlock(&pinctrldev_list_mutex); |
| |
| return NULL; |
| } |
| |
| /** |
| * pin_get_from_name() - look up a pin number from a name |
| * @pctldev: the pin control device to lookup the pin on |
| * @name: the name of the pin to look up |
| */ |
| int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name) |
| { |
| unsigned i, pin; |
| |
| /* The pin number can be retrived from the pin controller descriptor */ |
| for (i = 0; i < pctldev->desc->npins; i++) { |
| struct pin_desc *desc; |
| |
| pin = pctldev->desc->pins[i].number; |
| desc = pin_desc_get(pctldev, pin); |
| /* Pin space may be sparse */ |
| if (desc && !strcmp(name, desc->name)) |
| return pin; |
| } |
| |
| return -EINVAL; |
| } |
| |
| /** |
| * pin_get_name_from_id() - look up a pin name from a pin id |
| * @pctldev: the pin control device to lookup the pin on |
| * @pin: pin number/id to look up |
| */ |
| const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin) |
| { |
| const struct pin_desc *desc; |
| |
| desc = pin_desc_get(pctldev, pin); |
| if (!desc) { |
| dev_err(pctldev->dev, "failed to get pin(%d) name\n", |
| pin); |
| return NULL; |
| } |
| |
| return desc->name; |
| } |
| EXPORT_SYMBOL_GPL(pin_get_name); |
| |
| /* Deletes a range of pin descriptors */ |
| static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev, |
| const struct pinctrl_pin_desc *pins, |
| unsigned num_pins) |
| { |
| int i; |
| |
| for (i = 0; i < num_pins; i++) { |
| struct pin_desc *pindesc; |
| |
| pindesc = radix_tree_lookup(&pctldev->pin_desc_tree, |
| pins[i].number); |
| if (pindesc) { |
| radix_tree_delete(&pctldev->pin_desc_tree, |
| pins[i].number); |
| if (pindesc->dynamic_name) |
| kfree(pindesc->name); |
| } |
| kfree(pindesc); |
| } |
| } |
| |
| static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev, |
| const struct pinctrl_pin_desc *pin) |
| { |
| struct pin_desc *pindesc; |
| |
| pindesc = pin_desc_get(pctldev, pin->number); |
| if (pindesc) { |
| dev_err(pctldev->dev, "pin %d already registered\n", |
| pin->number); |
| return -EINVAL; |
| } |
| |
| pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL); |
| if (!pindesc) |
| return -ENOMEM; |
| |
| /* Set owner */ |
| pindesc->pctldev = pctldev; |
| |
| /* Copy basic pin info */ |
| if (pin->name) { |
| pindesc->name = pin->name; |
| } else { |
| pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", pin->number); |
| if (!pindesc->name) { |
| kfree(pindesc); |
| return -ENOMEM; |
| } |
| pindesc->dynamic_name = true; |
| } |
| |
| pindesc->drv_data = pin->drv_data; |
| |
| radix_tree_insert(&pctldev->pin_desc_tree, pin->number, pindesc); |
| pr_debug("registered pin %d (%s) on %s\n", |
| pin->number, pindesc->name, pctldev->desc->name); |
| return 0; |
| } |
| |
| static int pinctrl_register_pins(struct pinctrl_dev *pctldev, |
| const struct pinctrl_pin_desc *pins, |
| unsigned num_descs) |
| { |
| unsigned i; |
| int ret = 0; |
| |
| for (i = 0; i < num_descs; i++) { |
| ret = pinctrl_register_one_pin(pctldev, &pins[i]); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * gpio_to_pin() - GPIO range GPIO number to pin number translation |
| * @range: GPIO range used for the translation |
| * @gpio: gpio pin to translate to a pin number |
| * |
| * Finds the pin number for a given GPIO using the specified GPIO range |
| * as a base for translation. The distinction between linear GPIO ranges |
| * and pin list based GPIO ranges is managed correctly by this function. |
| * |
| * This function assumes the gpio is part of the specified GPIO range, use |
| * only after making sure this is the case (e.g. by calling it on the |
| * result of successful pinctrl_get_device_gpio_range calls)! |
| */ |
| static inline int gpio_to_pin(struct pinctrl_gpio_range *range, |
| unsigned int gpio) |
| { |
| unsigned int offset = gpio - range->base; |
| if (range->pins) |
| return range->pins[offset]; |
| else |
| return range->pin_base + offset; |
| } |
| |
| /** |
| * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range |
| * @pctldev: pin controller device to check |
| * @gpio: gpio pin to check taken from the global GPIO pin space |
| * |
| * Tries to match a GPIO pin number to the ranges handled by a certain pin |
| * controller, return the range or NULL |
| */ |
| static struct pinctrl_gpio_range * |
| pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio) |
| { |
| struct pinctrl_gpio_range *range; |
| |
| mutex_lock(&pctldev->mutex); |
| /* Loop over the ranges */ |
| list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
| /* Check if we're in the valid range */ |
| if (gpio >= range->base && |
| gpio < range->base + range->npins) { |
| mutex_unlock(&pctldev->mutex); |
| return range; |
| } |
| } |
| mutex_unlock(&pctldev->mutex); |
| return NULL; |
| } |
| |
| /** |
| * pinctrl_ready_for_gpio_range() - check if other GPIO pins of |
| * the same GPIO chip are in range |
| * @gpio: gpio pin to check taken from the global GPIO pin space |
| * |
| * This function is complement of pinctrl_match_gpio_range(). If the return |
| * value of pinctrl_match_gpio_range() is NULL, this function could be used |
| * to check whether pinctrl device is ready or not. Maybe some GPIO pins |
| * of the same GPIO chip don't have back-end pinctrl interface. |
| * If the return value is true, it means that pinctrl device is ready & the |
| * certain GPIO pin doesn't have back-end pinctrl device. If the return value |
| * is false, it means that pinctrl device may not be ready. |
| */ |
| #ifdef CONFIG_GPIOLIB |
| static bool pinctrl_ready_for_gpio_range(unsigned gpio) |
| { |
| struct pinctrl_dev *pctldev; |
| struct pinctrl_gpio_range *range = NULL; |
| struct gpio_chip *chip = gpio_to_chip(gpio); |
| |
| if (WARN(!chip, "no gpio_chip for gpio%i?", gpio)) |
| return false; |
| |
| mutex_lock(&pinctrldev_list_mutex); |
| |
| /* Loop over the pin controllers */ |
| list_for_each_entry(pctldev, &pinctrldev_list, node) { |
| /* Loop over the ranges */ |
| mutex_lock(&pctldev->mutex); |
| list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
| /* Check if any gpio range overlapped with gpio chip */ |
| if (range->base + range->npins - 1 < chip->base || |
| range->base > chip->base + chip->ngpio - 1) |
| continue; |
| mutex_unlock(&pctldev->mutex); |
| mutex_unlock(&pinctrldev_list_mutex); |
| return true; |
| } |
| mutex_unlock(&pctldev->mutex); |
| } |
| |
| mutex_unlock(&pinctrldev_list_mutex); |
| |
| return false; |
| } |
| #else |
| static bool pinctrl_ready_for_gpio_range(unsigned gpio) { return true; } |
| #endif |
| |
| /** |
| * pinctrl_get_device_gpio_range() - find device for GPIO range |
| * @gpio: the pin to locate the pin controller for |
| * @outdev: the pin control device if found |
| * @outrange: the GPIO range if found |
| * |
| * Find the pin controller handling a certain GPIO pin from the pinspace of |
| * the GPIO subsystem, return the device and the matching GPIO range. Returns |
| * -EPROBE_DEFER if the GPIO range could not be found in any device since it |
| * may still have not been registered. |
| */ |
| static int pinctrl_get_device_gpio_range(unsigned gpio, |
| struct pinctrl_dev **outdev, |
| struct pinctrl_gpio_range **outrange) |
| { |
| struct pinctrl_dev *pctldev; |
| |
| mutex_lock(&pinctrldev_list_mutex); |
| |
| /* Loop over the pin controllers */ |
| list_for_each_entry(pctldev, &pinctrldev_list, node) { |
| struct pinctrl_gpio_range *range; |
| |
| range = pinctrl_match_gpio_range(pctldev, gpio); |
| if (range) { |
| *outdev = pctldev; |
| *outrange = range; |
| mutex_unlock(&pinctrldev_list_mutex); |
| return 0; |
| } |
| } |
| |
| mutex_unlock(&pinctrldev_list_mutex); |
| |
| return -EPROBE_DEFER; |
| } |
| |
| /** |
| * pinctrl_add_gpio_range() - register a GPIO range for a controller |
| * @pctldev: pin controller device to add the range to |
| * @range: the GPIO range to add |
| * |
| * This adds a range of GPIOs to be handled by a certain pin controller. Call |
| * this to register handled ranges after registering your pin controller. |
| */ |
| void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev, |
| struct pinctrl_gpio_range *range) |
| { |
| mutex_lock(&pctldev->mutex); |
| list_add_tail(&range->node, &pctldev->gpio_ranges); |
| mutex_unlock(&pctldev->mutex); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range); |
| |
| void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev, |
| struct pinctrl_gpio_range *ranges, |
| unsigned nranges) |
| { |
| int i; |
| |
| for (i = 0; i < nranges; i++) |
| pinctrl_add_gpio_range(pctldev, &ranges[i]); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges); |
| |
| struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname, |
| struct pinctrl_gpio_range *range) |
| { |
| struct pinctrl_dev *pctldev; |
| |
| pctldev = get_pinctrl_dev_from_devname(devname); |
| |
| /* |
| * If we can't find this device, let's assume that is because |
| * it has not probed yet, so the driver trying to register this |
| * range need to defer probing. |
| */ |
| if (!pctldev) { |
| return ERR_PTR(-EPROBE_DEFER); |
| } |
| pinctrl_add_gpio_range(pctldev, range); |
| |
| return pctldev; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range); |
| |
| int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group, |
| const unsigned **pins, unsigned *num_pins) |
| { |
| const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
| int gs; |
| |
| if (!pctlops->get_group_pins) |
| return -EINVAL; |
| |
| gs = pinctrl_get_group_selector(pctldev, pin_group); |
| if (gs < 0) |
| return gs; |
| |
| return pctlops->get_group_pins(pctldev, gs, pins, num_pins); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_get_group_pins); |
| |
| struct pinctrl_gpio_range * |
| pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev, |
| unsigned int pin) |
| { |
| struct pinctrl_gpio_range *range; |
| |
| /* Loop over the ranges */ |
| list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
| /* Check if we're in the valid range */ |
| if (range->pins) { |
| int a; |
| for (a = 0; a < range->npins; a++) { |
| if (range->pins[a] == pin) |
| return range; |
| } |
| } else if (pin >= range->pin_base && |
| pin < range->pin_base + range->npins) |
| return range; |
| } |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin_nolock); |
| |
| /** |
| * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin |
| * @pctldev: the pin controller device to look in |
| * @pin: a controller-local number to find the range for |
| */ |
| struct pinctrl_gpio_range * |
| pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev, |
| unsigned int pin) |
| { |
| struct pinctrl_gpio_range *range; |
| |
| mutex_lock(&pctldev->mutex); |
| range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin); |
| mutex_unlock(&pctldev->mutex); |
| |
| return range; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin); |
| |
| /** |
| * pinctrl_remove_gpio_range() - remove a range of GPIOs from a pin controller |
| * @pctldev: pin controller device to remove the range from |
| * @range: the GPIO range to remove |
| */ |
| void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev, |
| struct pinctrl_gpio_range *range) |
| { |
| mutex_lock(&pctldev->mutex); |
| list_del(&range->node); |
| mutex_unlock(&pctldev->mutex); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range); |
| |
| #ifdef CONFIG_GENERIC_PINCTRL_GROUPS |
| |
| /** |
| * pinctrl_generic_get_group_count() - returns the number of pin groups |
| * @pctldev: pin controller device |
| */ |
| int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev) |
| { |
| return pctldev->num_groups; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_count); |
| |
| /** |
| * pinctrl_generic_get_group_name() - returns the name of a pin group |
| * @pctldev: pin controller device |
| * @selector: group number |
| */ |
| const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev, |
| unsigned int selector) |
| { |
| struct group_desc *group; |
| |
| group = radix_tree_lookup(&pctldev->pin_group_tree, |
| selector); |
| if (!group) |
| return NULL; |
| |
| return group->name; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_name); |
| |
| /** |
| * pinctrl_generic_get_group_pins() - gets the pin group pins |
| * @pctldev: pin controller device |
| * @selector: group number |
| * @pins: pins in the group |
| * @num_pins: number of pins in the group |
| */ |
| int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev, |
| unsigned int selector, |
| const unsigned int **pins, |
| unsigned int *num_pins) |
| { |
| struct group_desc *group; |
| |
| group = radix_tree_lookup(&pctldev->pin_group_tree, |
| selector); |
| if (!group) { |
| dev_err(pctldev->dev, "%s could not find pingroup%i\n", |
| __func__, selector); |
| return -EINVAL; |
| } |
| |
| *pins = group->pins; |
| *num_pins = group->num_pins; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_pins); |
| |
| /** |
| * pinctrl_generic_get_group() - returns a pin group based on the number |
| * @pctldev: pin controller device |
| * @selector: group number |
| */ |
| struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev, |
| unsigned int selector) |
| { |
| struct group_desc *group; |
| |
| group = radix_tree_lookup(&pctldev->pin_group_tree, |
| selector); |
| if (!group) |
| return NULL; |
| |
| return group; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_generic_get_group); |
| |
| static int pinctrl_generic_group_name_to_selector(struct pinctrl_dev *pctldev, |
| const char *function) |
| { |
| const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
| int ngroups = ops->get_groups_count(pctldev); |
| int selector = 0; |
| |
| /* See if this pctldev has this group */ |
| while (selector < ngroups) { |
| const char *gname = ops->get_group_name(pctldev, selector); |
| |
| if (gname && !strcmp(function, gname)) |
| return selector; |
| |
| selector++; |
| } |
| |
| return -EINVAL; |
| } |
| |
| /** |
| * pinctrl_generic_add_group() - adds a new pin group |
| * @pctldev: pin controller device |
| * @name: name of the pin group |
| * @pins: pins in the pin group |
| * @num_pins: number of pins in the pin group |
| * @data: pin controller driver specific data |
| * |
| * Note that the caller must take care of locking. |
| */ |
| int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name, |
| int *pins, int num_pins, void *data) |
| { |
| struct group_desc *group; |
| int selector; |
| |
| if (!name) |
| return -EINVAL; |
| |
| selector = pinctrl_generic_group_name_to_selector(pctldev, name); |
| if (selector >= 0) |
| return selector; |
| |
| selector = pctldev->num_groups; |
| |
| group = devm_kzalloc(pctldev->dev, sizeof(*group), GFP_KERNEL); |
| if (!group) |
| return -ENOMEM; |
| |
| group->name = name; |
| group->pins = pins; |
| group->num_pins = num_pins; |
| group->data = data; |
| |
| radix_tree_insert(&pctldev->pin_group_tree, selector, group); |
| |
| pctldev->num_groups++; |
| |
| return selector; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_generic_add_group); |
| |
| /** |
| * pinctrl_generic_remove_group() - removes a numbered pin group |
| * @pctldev: pin controller device |
| * @selector: group number |
| * |
| * Note that the caller must take care of locking. |
| */ |
| int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev, |
| unsigned int selector) |
| { |
| struct group_desc *group; |
| |
| group = radix_tree_lookup(&pctldev->pin_group_tree, |
| selector); |
| if (!group) |
| return -ENOENT; |
| |
| radix_tree_delete(&pctldev->pin_group_tree, selector); |
| devm_kfree(pctldev->dev, group); |
| |
| pctldev->num_groups--; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_generic_remove_group); |
| |
| /** |
| * pinctrl_generic_free_groups() - removes all pin groups |
| * @pctldev: pin controller device |
| * |
| * Note that the caller must take care of locking. The pinctrl groups |
| * are allocated with devm_kzalloc() so no need to free them here. |
| */ |
| static void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev) |
| { |
| struct radix_tree_iter iter; |
| void __rcu **slot; |
| |
| radix_tree_for_each_slot(slot, &pctldev->pin_group_tree, &iter, 0) |
| radix_tree_delete(&pctldev->pin_group_tree, iter.index); |
| |
| pctldev->num_groups = 0; |
| } |
| |
| #else |
| static inline void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev) |
| { |
| } |
| #endif /* CONFIG_GENERIC_PINCTRL_GROUPS */ |
| |
| /** |
| * pinctrl_get_group_selector() - returns the group selector for a group |
| * @pctldev: the pin controller handling the group |
| * @pin_group: the pin group to look up |
| */ |
| int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, |
| const char *pin_group) |
| { |
| const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
| unsigned ngroups = pctlops->get_groups_count(pctldev); |
| unsigned group_selector = 0; |
| |
| while (group_selector < ngroups) { |
| const char *gname = pctlops->get_group_name(pctldev, |
| group_selector); |
| if (gname && !strcmp(gname, pin_group)) { |
| dev_dbg(pctldev->dev, |
| "found group selector %u for %s\n", |
| group_selector, |
| pin_group); |
| return group_selector; |
| } |
| |
| group_selector++; |
| } |
| |
| dev_err(pctldev->dev, "does not have pin group %s\n", |
| pin_group); |
| |
| return -EINVAL; |
| } |
| |
| bool pinctrl_gpio_can_use_line(unsigned gpio) |
| { |
| struct pinctrl_dev *pctldev; |
| struct pinctrl_gpio_range *range; |
| bool result; |
| int pin; |
| |
| /* |
| * Try to obtain GPIO range, if it fails |
| * we're probably dealing with GPIO driver |
| * without a backing pin controller - bail out. |
| */ |
| if (pinctrl_get_device_gpio_range(gpio, &pctldev, &range)) |
| return true; |
| |
| mutex_lock(&pctldev->mutex); |
| |
| /* Convert to the pin controllers number space */ |
| pin = gpio_to_pin(range, gpio); |
| |
| result = pinmux_can_be_used_for_gpio(pctldev, pin); |
| |
| mutex_unlock(&pctldev->mutex); |
| |
| return result; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_gpio_can_use_line); |
| |
| /** |
| * pinctrl_gpio_request() - request a single pin to be used as GPIO |
| * @gpio: the GPIO pin number from the GPIO subsystem number space |
| * |
| * This function should *ONLY* be used from gpiolib-based GPIO drivers, |
| * as part of their gpio_request() semantics, platforms and individual drivers |
| * shall *NOT* request GPIO pins to be muxed in. |
| */ |
| int pinctrl_gpio_request(unsigned gpio) |
| { |
| struct pinctrl_dev *pctldev; |
| struct pinctrl_gpio_range *range; |
| int ret; |
| int pin; |
| |
| ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
| if (ret) { |
| if (pinctrl_ready_for_gpio_range(gpio)) |
| ret = 0; |
| return ret; |
| } |
| |
| mutex_lock(&pctldev->mutex); |
| |
| /* Convert to the pin controllers number space */ |
| pin = gpio_to_pin(range, gpio); |
| |
| ret = pinmux_request_gpio(pctldev, range, pin, gpio); |
| |
| mutex_unlock(&pctldev->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_gpio_request); |
| |
| /** |
| * pinctrl_gpio_free() - free control on a single pin, currently used as GPIO |
| * @gpio: the GPIO pin number from the GPIO subsystem number space |
| * |
| * This function should *ONLY* be used from gpiolib-based GPIO drivers, |
| * as part of their gpio_free() semantics, platforms and individual drivers |
| * shall *NOT* request GPIO pins to be muxed out. |
| */ |
| void pinctrl_gpio_free(unsigned gpio) |
| { |
| struct pinctrl_dev *pctldev; |
| struct pinctrl_gpio_range *range; |
| int ret; |
| int pin; |
| |
| ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
| if (ret) { |
| return; |
| } |
| mutex_lock(&pctldev->mutex); |
| |
| /* Convert to the pin controllers number space */ |
| pin = gpio_to_pin(range, gpio); |
| |
| pinmux_free_gpio(pctldev, pin, range); |
| |
| mutex_unlock(&pctldev->mutex); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_gpio_free); |
| |
| static int pinctrl_gpio_direction(unsigned gpio, bool input) |
| { |
| struct pinctrl_dev *pctldev; |
| struct pinctrl_gpio_range *range; |
| int ret; |
| int pin; |
| |
| ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
| if (ret) { |
| return ret; |
| } |
| |
| mutex_lock(&pctldev->mutex); |
| |
| /* Convert to the pin controllers number space */ |
| pin = gpio_to_pin(range, gpio); |
| ret = pinmux_gpio_direction(pctldev, range, pin, input); |
| |
| mutex_unlock(&pctldev->mutex); |
| |
| return ret; |
| } |
| |
| /** |
| * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode |
| * @gpio: the GPIO pin number from the GPIO subsystem number space |
| * |
| * This function should *ONLY* be used from gpiolib-based GPIO drivers, |
| * as part of their gpio_direction_input() semantics, platforms and individual |
| * drivers shall *NOT* touch pin control GPIO calls. |
| */ |
| int pinctrl_gpio_direction_input(unsigned gpio) |
| { |
| return pinctrl_gpio_direction(gpio, true); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input); |
| |
| /** |
| * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode |
| * @gpio: the GPIO pin number from the GPIO subsystem number space |
| * |
| * This function should *ONLY* be used from gpiolib-based GPIO drivers, |
| * as part of their gpio_direction_output() semantics, platforms and individual |
| * drivers shall *NOT* touch pin control GPIO calls. |
| */ |
| int pinctrl_gpio_direction_output(unsigned gpio) |
| { |
| return pinctrl_gpio_direction(gpio, false); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); |
| |
| /** |
| * pinctrl_gpio_set_config() - Apply config to given GPIO pin |
| * @gpio: the GPIO pin number from the GPIO subsystem number space |
| * @config: the configuration to apply to the GPIO |
| * |
| * This function should *ONLY* be used from gpiolib-based GPIO drivers, if |
| * they need to call the underlying pin controller to change GPIO config |
| * (for example set debounce time). |
| */ |
| int pinctrl_gpio_set_config(unsigned gpio, unsigned long config) |
| { |
| unsigned long configs[] = { config }; |
| struct pinctrl_gpio_range *range; |
| struct pinctrl_dev *pctldev; |
| int ret, pin; |
| |
| ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
| if (ret) |
| return ret; |
| |
| mutex_lock(&pctldev->mutex); |
| pin = gpio_to_pin(range, gpio); |
| ret = pinconf_set_config(pctldev, pin, configs, ARRAY_SIZE(configs)); |
| mutex_unlock(&pctldev->mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config); |
| |
| static struct pinctrl_state *find_state(struct pinctrl *p, |
| const char *name) |
| { |
| struct pinctrl_state *state; |
| |
| list_for_each_entry(state, &p->states, node) |
| if (!strcmp(state->name, name)) |
| return state; |
| |
| return NULL; |
| } |
| |
| static struct pinctrl_state *create_state(struct pinctrl *p, |
| const char *name) |
| { |
| struct pinctrl_state *state; |
| |
| state = kzalloc(sizeof(*state), GFP_KERNEL); |
| if (!state) |
| return ERR_PTR(-ENOMEM); |
| |
| state->name = name; |
| INIT_LIST_HEAD(&state->settings); |
| |
| list_add_tail(&state->node, &p->states); |
| |
| return state; |
| } |
| |
| static int add_setting(struct pinctrl *p, struct pinctrl_dev *pctldev, |
| const struct pinctrl_map *map) |
| { |
| struct pinctrl_state *state; |
| struct pinctrl_setting *setting; |
| int ret; |
| |
| state = find_state(p, map->name); |
| if (!state) |
| state = create_state(p, map->name); |
| if (IS_ERR(state)) |
| return PTR_ERR(state); |
| |
| if (map->type == PIN_MAP_TYPE_DUMMY_STATE) |
| return 0; |
| |
| setting = kzalloc(sizeof(*setting), GFP_KERNEL); |
| if (!setting) |
| return -ENOMEM; |
| |
| setting->type = map->type; |
| |
| if (pctldev) |
| setting->pctldev = pctldev; |
| else |
| setting->pctldev = |
| get_pinctrl_dev_from_devname(map->ctrl_dev_name); |
| if (!setting->pctldev) { |
| kfree(setting); |
| /* Do not defer probing of hogs (circular loop) */ |
| if (!strcmp(map->ctrl_dev_name, map->dev_name)) |
| return -ENODEV; |
| /* |
| * OK let us guess that the driver is not there yet, and |
| * let's defer obtaining this pinctrl handle to later... |
| */ |
| dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe", |
| map->ctrl_dev_name); |
| return -EPROBE_DEFER; |
| } |
| |
| setting->dev_name = map->dev_name; |
| |
| switch (map->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| ret = pinmux_map_to_setting(map, setting); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| ret = pinconf_map_to_setting(map, setting); |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| if (ret < 0) { |
| kfree(setting); |
| return ret; |
| } |
| |
| list_add_tail(&setting->node, &state->settings); |
| |
| return 0; |
| } |
| |
| static struct pinctrl *find_pinctrl(struct device *dev) |
| { |
| struct pinctrl *p; |
| |
| mutex_lock(&pinctrl_list_mutex); |
| list_for_each_entry(p, &pinctrl_list, node) |
| if (p->dev == dev) { |
| mutex_unlock(&pinctrl_list_mutex); |
| return p; |
| } |
| |
| mutex_unlock(&pinctrl_list_mutex); |
| return NULL; |
| } |
| |
| static void pinctrl_free(struct pinctrl *p, bool inlist); |
| |
| static struct pinctrl *create_pinctrl(struct device *dev, |
| struct pinctrl_dev *pctldev) |
| { |
| struct pinctrl *p; |
| const char *devname; |
| struct pinctrl_maps *maps_node; |
| int i; |
| const struct pinctrl_map *map; |
| int ret; |
| |
| /* |
| * create the state cookie holder struct pinctrl for each |
| * mapping, this is what consumers will get when requesting |
| * a pin control handle with pinctrl_get() |
| */ |
| p = kzalloc(sizeof(*p), GFP_KERNEL); |
| if (!p) |
| return ERR_PTR(-ENOMEM); |
| p->dev = dev; |
| INIT_LIST_HEAD(&p->states); |
| INIT_LIST_HEAD(&p->dt_maps); |
| |
| ret = pinctrl_dt_to_map(p, pctldev); |
| if (ret < 0) { |
| kfree(p); |
| return ERR_PTR(ret); |
| } |
| |
| devname = dev_name(dev); |
| |
| mutex_lock(&pinctrl_maps_mutex); |
| /* Iterate over the pin control maps to locate the right ones */ |
| for_each_maps(maps_node, i, map) { |
| /* Map must be for this device */ |
| if (strcmp(map->dev_name, devname)) |
| continue; |
| /* |
| * If pctldev is not null, we are claiming hog for it, |
| * that means, setting that is served by pctldev by itself. |
| * |
| * Thus we must skip map that is for this device but is served |
| * by other device. |
| */ |
| if (pctldev && |
| strcmp(dev_name(pctldev->dev), map->ctrl_dev_name)) |
| continue; |
| |
| ret = add_setting(p, pctldev, map); |
| /* |
| * At this point the adding of a setting may: |
| * |
| * - Defer, if the pinctrl device is not yet available |
| * - Fail, if the pinctrl device is not yet available, |
| * AND the setting is a hog. We cannot defer that, since |
| * the hog will kick in immediately after the device |
| * is registered. |
| * |
| * If the error returned was not -EPROBE_DEFER then we |
| * accumulate the errors to see if we end up with |
| * an -EPROBE_DEFER later, as that is the worst case. |
| */ |
| if (ret == -EPROBE_DEFER) { |
| pinctrl_free(p, false); |
| mutex_unlock(&pinctrl_maps_mutex); |
| return ERR_PTR(ret); |
| } |
| } |
| mutex_unlock(&pinctrl_maps_mutex); |
| |
| if (ret < 0) { |
| /* If some other error than deferral occurred, return here */ |
| pinctrl_free(p, false); |
| return ERR_PTR(ret); |
| } |
| |
| kref_init(&p->users); |
| |
| /* Add the pinctrl handle to the global list */ |
| mutex_lock(&pinctrl_list_mutex); |
| list_add_tail(&p->node, &pinctrl_list); |
| mutex_unlock(&pinctrl_list_mutex); |
| |
| return p; |
| } |
| |
| /** |
| * pinctrl_get() - retrieves the pinctrl handle for a device |
| * @dev: the device to obtain the handle for |
| */ |
| struct pinctrl *pinctrl_get(struct device *dev) |
| { |
| struct pinctrl *p; |
| |
| if (WARN_ON(!dev)) |
| return ERR_PTR(-EINVAL); |
| |
| /* |
| * See if somebody else (such as the device core) has already |
| * obtained a handle to the pinctrl for this device. In that case, |
| * return another pointer to it. |
| */ |
| p = find_pinctrl(dev); |
| if (p) { |
| dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n"); |
| kref_get(&p->users); |
| return p; |
| } |
| |
| return create_pinctrl(dev, NULL); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_get); |
| |
| static void pinctrl_free_setting(bool disable_setting, |
| struct pinctrl_setting *setting) |
| { |
| switch (setting->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| if (disable_setting) |
| pinmux_disable_setting(setting); |
| pinmux_free_setting(setting); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| pinconf_free_setting(setting); |
| break; |
| default: |
| break; |
| } |
| } |
| |
| static void pinctrl_free(struct pinctrl *p, bool inlist) |
| { |
| struct pinctrl_state *state, *n1; |
| struct pinctrl_setting *setting, *n2; |
| |
| mutex_lock(&pinctrl_list_mutex); |
| list_for_each_entry_safe(state, n1, &p->states, node) { |
| list_for_each_entry_safe(setting, n2, &state->settings, node) { |
| pinctrl_free_setting(state == p->state, setting); |
| list_del(&setting->node); |
| kfree(setting); |
| } |
| list_del(&state->node); |
| kfree(state); |
| } |
| |
| pinctrl_dt_free_maps(p); |
| |
| if (inlist) |
| list_del(&p->node); |
| kfree(p); |
| mutex_unlock(&pinctrl_list_mutex); |
| } |
| |
| /** |
| * pinctrl_release() - release the pinctrl handle |
| * @kref: the kref in the pinctrl being released |
| */ |
| static void pinctrl_release(struct kref *kref) |
| { |
| struct pinctrl *p = container_of(kref, struct pinctrl, users); |
| |
| pinctrl_free(p, true); |
| } |
| |
| /** |
| * pinctrl_put() - decrease use count on a previously claimed pinctrl handle |
| * @p: the pinctrl handle to release |
| */ |
| void pinctrl_put(struct pinctrl *p) |
| { |
| kref_put(&p->users, pinctrl_release); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_put); |
| |
| /** |
| * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle |
| * @p: the pinctrl handle to retrieve the state from |
| * @name: the state name to retrieve |
| */ |
| struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, |
| const char *name) |
| { |
| struct pinctrl_state *state; |
| |
| state = find_state(p, name); |
| if (!state) { |
| if (pinctrl_dummy_state) { |
| /* create dummy state */ |
| dev_dbg(p->dev, "using pinctrl dummy state (%s)\n", |
| name); |
| state = create_state(p, name); |
| } else |
| state = ERR_PTR(-ENODEV); |
| } |
| |
| return state; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_lookup_state); |
| |
| static void pinctrl_link_add(struct pinctrl_dev *pctldev, |
| struct device *consumer) |
| { |
| if (pctldev->desc->link_consumers) |
| device_link_add(consumer, pctldev->dev, |
| DL_FLAG_PM_RUNTIME | |
| DL_FLAG_AUTOREMOVE_CONSUMER); |
| } |
| |
| /** |
| * pinctrl_commit_state() - select/activate/program a pinctrl state to HW |
| * @p: the pinctrl handle for the device that requests configuration |
| * @state: the state handle to select/activate/program |
| */ |
| static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state) |
| { |
| struct pinctrl_setting *setting, *setting2; |
| struct pinctrl_state *old_state = p->state; |
| int ret; |
| |
| if (p->state) { |
| /* |
| * For each pinmux setting in the old state, forget SW's record |
| * of mux owner for that pingroup. Any pingroups which are |
| * still owned by the new state will be re-acquired by the call |
| * to pinmux_enable_setting() in the loop below. |
| */ |
| list_for_each_entry(setting, &p->state->settings, node) { |
| if (setting->type != PIN_MAP_TYPE_MUX_GROUP) |
| continue; |
| pinmux_disable_setting(setting); |
| } |
| } |
| |
| p->state = NULL; |
| |
| /* Apply all the settings for the new state */ |
| list_for_each_entry(setting, &state->settings, node) { |
| switch (setting->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| ret = pinmux_enable_setting(setting); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| ret = pinconf_apply_setting(setting); |
| break; |
| default: |
| ret = -EINVAL; |
| break; |
| } |
| |
| if (ret < 0) { |
| goto unapply_new_state; |
| } |
| |
| /* Do not link hogs (circular dependency) */ |
| if (p != setting->pctldev->p) |
| pinctrl_link_add(setting->pctldev, p->dev); |
| } |
| |
| p->state = state; |
| |
| return 0; |
| |
| unapply_new_state: |
| dev_err(p->dev, "Error applying setting, reverse things back\n"); |
| |
| list_for_each_entry(setting2, &state->settings, node) { |
| if (&setting2->node == &setting->node) |
| break; |
| /* |
| * All we can do here is pinmux_disable_setting. |
| * That means that some pins are muxed differently now |
| * than they were before applying the setting (We can't |
| * "unmux a pin"!), but it's not a big deal since the pins |
| * are free to be muxed by another apply_setting. |
| */ |
| if (setting2->type == PIN_MAP_TYPE_MUX_GROUP) |
| pinmux_disable_setting(setting2); |
| } |
| |
| /* There's no infinite recursive loop here because p->state is NULL */ |
| if (old_state) |
| pinctrl_select_state(p, old_state); |
| |
| return ret; |
| } |
| |
| /** |
| * pinctrl_select_state() - select/activate/program a pinctrl state to HW |
| * @p: the pinctrl handle for the device that requests configuration |
| * @state: the state handle to select/activate/program |
| */ |
| int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) |
| { |
| if (p->state == state) |
| return 0; |
| |
| return pinctrl_commit_state(p, state); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_select_state); |
| |
| static void devm_pinctrl_release(struct device *dev, void *res) |
| { |
| pinctrl_put(*(struct pinctrl **)res); |
| } |
| |
| /** |
| * devm_pinctrl_get() - Resource managed pinctrl_get() |
| * @dev: the device to obtain the handle for |
| * |
| * If there is a need to explicitly destroy the returned struct pinctrl, |
| * devm_pinctrl_put() should be used, rather than plain pinctrl_put(). |
| */ |
| struct pinctrl *devm_pinctrl_get(struct device *dev) |
| { |
| struct pinctrl **ptr, *p; |
| |
| ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return ERR_PTR(-ENOMEM); |
| |
| p = pinctrl_get(dev); |
| if (!IS_ERR(p)) { |
| *ptr = p; |
| devres_add(dev, ptr); |
| } else { |
| devres_free(ptr); |
| } |
| |
| return p; |
| } |
| EXPORT_SYMBOL_GPL(devm_pinctrl_get); |
| |
| static int devm_pinctrl_match(struct device *dev, void *res, void *data) |
| { |
| struct pinctrl **p = res; |
| |
| return *p == data; |
| } |
| |
| /** |
| * devm_pinctrl_put() - Resource managed pinctrl_put() |
| * @p: the pinctrl handle to release |
| * |
| * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally |
| * this function will not need to be called and the resource management |
| * code will ensure that the resource is freed. |
| */ |
| void devm_pinctrl_put(struct pinctrl *p) |
| { |
| WARN_ON(devres_release(p->dev, devm_pinctrl_release, |
| devm_pinctrl_match, p)); |
| } |
| EXPORT_SYMBOL_GPL(devm_pinctrl_put); |
| |
| /** |
| * pinctrl_register_mappings() - register a set of pin controller mappings |
| * @maps: the pincontrol mappings table to register. Note the pinctrl-core |
| * keeps a reference to the passed in maps, so they should _not_ be |
| * marked with __initdata. |
| * @num_maps: the number of maps in the mapping table |
| */ |
| int pinctrl_register_mappings(const struct pinctrl_map *maps, |
| unsigned num_maps) |
| { |
| int i, ret; |
| struct pinctrl_maps *maps_node; |
| |
| pr_debug("add %u pinctrl maps\n", num_maps); |
| |
| /* First sanity check the new mapping */ |
| for (i = 0; i < num_maps; i++) { |
| if (!maps[i].dev_name) { |
| pr_err("failed to register map %s (%d): no device given\n", |
| maps[i].name, i); |
| return -EINVAL; |
| } |
| |
| if (!maps[i].name) { |
| pr_err("failed to register map %d: no map name given\n", |
| i); |
| return -EINVAL; |
| } |
| |
| if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE && |
| !maps[i].ctrl_dev_name) { |
| pr_err("failed to register map %s (%d): no pin control device given\n", |
| maps[i].name, i); |
| return -EINVAL; |
| } |
| |
| switch (maps[i].type) { |
| case PIN_MAP_TYPE_DUMMY_STATE: |
| break; |
| case PIN_MAP_TYPE_MUX_GROUP: |
| ret = pinmux_validate_map(&maps[i], i); |
| if (ret < 0) |
| return ret; |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| ret = pinconf_validate_map(&maps[i], i); |
| if (ret < 0) |
| return ret; |
| break; |
| default: |
| pr_err("failed to register map %s (%d): invalid type given\n", |
| maps[i].name, i); |
| return -EINVAL; |
| } |
| } |
| |
| maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL); |
| if (!maps_node) |
| return -ENOMEM; |
| |
| maps_node->maps = maps; |
| maps_node->num_maps = num_maps; |
| |
| mutex_lock(&pinctrl_maps_mutex); |
| list_add_tail(&maps_node->node, &pinctrl_maps); |
| mutex_unlock(&pinctrl_maps_mutex); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_register_mappings); |
| |
| /** |
| * pinctrl_unregister_mappings() - unregister a set of pin controller mappings |
| * @map: the pincontrol mappings table passed to pinctrl_register_mappings() |
| * when registering the mappings. |
| */ |
| void pinctrl_unregister_mappings(const struct pinctrl_map *map) |
| { |
| struct pinctrl_maps *maps_node; |
| |
| mutex_lock(&pinctrl_maps_mutex); |
| list_for_each_entry(maps_node, &pinctrl_maps, node) { |
| if (maps_node->maps == map) { |
| list_del(&maps_node->node); |
| kfree(maps_node); |
| mutex_unlock(&pinctrl_maps_mutex); |
| return; |
| } |
| } |
| mutex_unlock(&pinctrl_maps_mutex); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_unregister_mappings); |
| |
| /** |
| * pinctrl_force_sleep() - turn a given controller device into sleep state |
| * @pctldev: pin controller device |
| */ |
| int pinctrl_force_sleep(struct pinctrl_dev *pctldev) |
| { |
| if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep)) |
| return pinctrl_commit_state(pctldev->p, pctldev->hog_sleep); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_force_sleep); |
| |
| /** |
| * pinctrl_force_default() - turn a given controller device into default state |
| * @pctldev: pin controller device |
| */ |
| int pinctrl_force_default(struct pinctrl_dev *pctldev) |
| { |
| if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default)) |
| return pinctrl_commit_state(pctldev->p, pctldev->hog_default); |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_force_default); |
| |
| /** |
| * pinctrl_init_done() - tell pinctrl probe is done |
| * |
| * We'll use this time to switch the pins from "init" to "default" unless the |
| * driver selected some other state. |
| * |
| * @dev: device to that's done probing |
| */ |
| int pinctrl_init_done(struct device *dev) |
| { |
| struct dev_pin_info *pins = dev->pins; |
| int ret; |
| |
| if (!pins) |
| return 0; |
| |
| if (IS_ERR(pins->init_state)) |
| return 0; /* No such state */ |
| |
| if (pins->p->state != pins->init_state) |
| return 0; /* Not at init anyway */ |
| |
| if (IS_ERR(pins->default_state)) |
| return 0; /* No default state */ |
| |
| ret = pinctrl_select_state(pins->p, pins->default_state); |
| if (ret) |
| dev_err(dev, "failed to activate default pinctrl state\n"); |
| |
| return ret; |
| } |
| |
| static int pinctrl_select_bound_state(struct device *dev, |
| struct pinctrl_state *state) |
| { |
| struct dev_pin_info *pins = dev->pins; |
| int ret; |
| |
| if (IS_ERR(state)) |
| return 0; /* No such state */ |
| ret = pinctrl_select_state(pins->p, state); |
| if (ret) |
| dev_err(dev, "failed to activate pinctrl state %s\n", |
| state->name); |
| return ret; |
| } |
| |
| /** |
| * pinctrl_select_default_state() - select default pinctrl state |
| * @dev: device to select default state for |
| */ |
| int pinctrl_select_default_state(struct device *dev) |
| { |
| if (!dev->pins) |
| return 0; |
| |
| return pinctrl_select_bound_state(dev, dev->pins->default_state); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_select_default_state); |
| |
| #ifdef CONFIG_PM |
| |
| /** |
| * pinctrl_pm_select_default_state() - select default pinctrl state for PM |
| * @dev: device to select default state for |
| */ |
| int pinctrl_pm_select_default_state(struct device *dev) |
| { |
| return pinctrl_select_default_state(dev); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state); |
| |
| /** |
| * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM |
| * @dev: device to select sleep state for |
| */ |
| int pinctrl_pm_select_sleep_state(struct device *dev) |
| { |
| if (!dev->pins) |
| return 0; |
| |
| return pinctrl_select_bound_state(dev, dev->pins->sleep_state); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state); |
| |
| /** |
| * pinctrl_pm_select_idle_state() - select idle pinctrl state for PM |
| * @dev: device to select idle state for |
| */ |
| int pinctrl_pm_select_idle_state(struct device *dev) |
| { |
| if (!dev->pins) |
| return 0; |
| |
| return pinctrl_select_bound_state(dev, dev->pins->idle_state); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state); |
| #endif |
| |
| #ifdef CONFIG_DEBUG_FS |
| |
| static int pinctrl_pins_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev = s->private; |
| const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
| unsigned i, pin; |
| #ifdef CONFIG_GPIOLIB |
| struct pinctrl_gpio_range *range; |
| struct gpio_chip *chip; |
| int gpio_num; |
| #endif |
| |
| seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); |
| |
| mutex_lock(&pctldev->mutex); |
| |
| /* The pin number can be retrived from the pin controller descriptor */ |
| for (i = 0; i < pctldev->desc->npins; i++) { |
| struct pin_desc *desc; |
| |
| pin = pctldev->desc->pins[i].number; |
| desc = pin_desc_get(pctldev, pin); |
| /* Pin space may be sparse */ |
| if (!desc) |
| continue; |
| |
| seq_printf(s, "pin %d (%s) ", pin, desc->name); |
| |
| #ifdef CONFIG_GPIOLIB |
| gpio_num = -1; |
| list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
| if ((pin >= range->pin_base) && |
| (pin < (range->pin_base + range->npins))) { |
| gpio_num = range->base + (pin - range->pin_base); |
| break; |
| } |
| } |
| if (gpio_num >= 0) |
| chip = gpio_to_chip(gpio_num); |
| else |
| chip = NULL; |
| if (chip) |
| seq_printf(s, "%u:%s ", gpio_num - chip->gpiodev->base, chip->label); |
| else |
| seq_puts(s, "0:? "); |
| #endif |
| |
| /* Driver-specific info per pin */ |
| if (ops->pin_dbg_show) |
| ops->pin_dbg_show(pctldev, s, pin); |
| |
| seq_puts(s, "\n"); |
| } |
| |
| mutex_unlock(&pctldev->mutex); |
| |
| return 0; |
| } |
| DEFINE_SHOW_ATTRIBUTE(pinctrl_pins); |
| |
| static int pinctrl_groups_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev = s->private; |
| const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
| unsigned ngroups, selector = 0; |
| |
| mutex_lock(&pctldev->mutex); |
| |
| ngroups = ops->get_groups_count(pctldev); |
| |
| seq_puts(s, "registered pin groups:\n"); |
| while (selector < ngroups) { |
| const unsigned *pins = NULL; |
| unsigned num_pins = 0; |
| const char *gname = ops->get_group_name(pctldev, selector); |
| const char *pname; |
| int ret = 0; |
| int i; |
| |
| if (ops->get_group_pins) |
| ret = ops->get_group_pins(pctldev, selector, |
| &pins, &num_pins); |
| if (ret) |
| seq_printf(s, "%s [ERROR GETTING PINS]\n", |
| gname); |
| else { |
| seq_printf(s, "group: %s\n", gname); |
| for (i = 0; i < num_pins; i++) { |
| pname = pin_get_name(pctldev, pins[i]); |
| if (WARN_ON(!pname)) { |
| mutex_unlock(&pctldev->mutex); |
| return -EINVAL; |
| } |
| seq_printf(s, "pin %d (%s)\n", pins[i], pname); |
| } |
| seq_puts(s, "\n"); |
| } |
| selector++; |
| } |
| |
| mutex_unlock(&pctldev->mutex); |
| |
| return 0; |
| } |
| DEFINE_SHOW_ATTRIBUTE(pinctrl_groups); |
| |
| static int pinctrl_gpioranges_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev = s->private; |
| struct pinctrl_gpio_range *range; |
| |
| seq_puts(s, "GPIO ranges handled:\n"); |
| |
| mutex_lock(&pctldev->mutex); |
| |
| /* Loop over the ranges */ |
| list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
| if (range->pins) { |
| int a; |
| seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {", |
| range->id, range->name, |
| range->base, (range->base + range->npins - 1)); |
| for (a = 0; a < range->npins - 1; a++) |
| seq_printf(s, "%u, ", range->pins[a]); |
| seq_printf(s, "%u}\n", range->pins[a]); |
| } |
| else |
| seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
| range->id, range->name, |
| range->base, (range->base + range->npins - 1), |
| range->pin_base, |
| (range->pin_base + range->npins - 1)); |
| } |
| |
| mutex_unlock(&pctldev->mutex); |
| |
| return 0; |
| } |
| DEFINE_SHOW_ATTRIBUTE(pinctrl_gpioranges); |
| |
| static int pinctrl_devices_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_dev *pctldev; |
| |
| seq_puts(s, "name [pinmux] [pinconf]\n"); |
| |
| mutex_lock(&pinctrldev_list_mutex); |
| |
| list_for_each_entry(pctldev, &pinctrldev_list, node) { |
| seq_printf(s, "%s ", pctldev->desc->name); |
| if (pctldev->desc->pmxops) |
| seq_puts(s, "yes "); |
| else |
| seq_puts(s, "no "); |
| if (pctldev->desc->confops) |
| seq_puts(s, "yes"); |
| else |
| seq_puts(s, "no"); |
| seq_puts(s, "\n"); |
| } |
| |
| mutex_unlock(&pinctrldev_list_mutex); |
| |
| return 0; |
| } |
| DEFINE_SHOW_ATTRIBUTE(pinctrl_devices); |
| |
| static inline const char *map_type(enum pinctrl_map_type type) |
| { |
| static const char * const names[] = { |
| "INVALID", |
| "DUMMY_STATE", |
| "MUX_GROUP", |
| "CONFIGS_PIN", |
| "CONFIGS_GROUP", |
| }; |
| |
| if (type >= ARRAY_SIZE(names)) |
| return "UNKNOWN"; |
| |
| return names[type]; |
| } |
| |
| static int pinctrl_maps_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl_maps *maps_node; |
| int i; |
| const struct pinctrl_map *map; |
| |
| seq_puts(s, "Pinctrl maps:\n"); |
| |
| mutex_lock(&pinctrl_maps_mutex); |
| for_each_maps(maps_node, i, map) { |
| seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n", |
| map->dev_name, map->name, map_type(map->type), |
| map->type); |
| |
| if (map->type != PIN_MAP_TYPE_DUMMY_STATE) |
| seq_printf(s, "controlling device %s\n", |
| map->ctrl_dev_name); |
| |
| switch (map->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| pinmux_show_map(s, map); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| pinconf_show_map(s, map); |
| break; |
| default: |
| break; |
| } |
| |
| seq_putc(s, '\n'); |
| } |
| mutex_unlock(&pinctrl_maps_mutex); |
| |
| return 0; |
| } |
| DEFINE_SHOW_ATTRIBUTE(pinctrl_maps); |
| |
| static int pinctrl_show(struct seq_file *s, void *what) |
| { |
| struct pinctrl *p; |
| struct pinctrl_state *state; |
| struct pinctrl_setting *setting; |
| |
| seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); |
| |
| mutex_lock(&pinctrl_list_mutex); |
| |
| list_for_each_entry(p, &pinctrl_list, node) { |
| seq_printf(s, "device: %s current state: %s\n", |
| dev_name(p->dev), |
| p->state ? p->state->name : "none"); |
| |
| list_for_each_entry(state, &p->states, node) { |
| seq_printf(s, " state: %s\n", state->name); |
| |
| list_for_each_entry(setting, &state->settings, node) { |
| struct pinctrl_dev *pctldev = setting->pctldev; |
| |
| seq_printf(s, " type: %s controller %s ", |
| map_type(setting->type), |
| pinctrl_dev_get_name(pctldev)); |
| |
| switch (setting->type) { |
| case PIN_MAP_TYPE_MUX_GROUP: |
| pinmux_show_setting(s, setting); |
| break; |
| case PIN_MAP_TYPE_CONFIGS_PIN: |
| case PIN_MAP_TYPE_CONFIGS_GROUP: |
| pinconf_show_setting(s, setting); |
| break; |
| default: |
| break; |
| } |
| } |
| } |
| } |
| |
| mutex_unlock(&pinctrl_list_mutex); |
| |
| return 0; |
| } |
| DEFINE_SHOW_ATTRIBUTE(pinctrl); |
| |
| static struct dentry *debugfs_root; |
| |
| static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) |
| { |
| struct dentry *device_root; |
| const char *debugfs_name; |
| |
| if (pctldev->desc->name && |
| strcmp(dev_name(pctldev->dev), pctldev->desc->name)) { |
| debugfs_name = devm_kasprintf(pctldev->dev, GFP_KERNEL, |
| "%s-%s", dev_name(pctldev->dev), |
| pctldev->desc->name); |
| if (!debugfs_name) { |
| pr_warn("failed to determine debugfs dir name for %s\n", |
| dev_name(pctldev->dev)); |
| return; |
| } |
| } else { |
| debugfs_name = dev_name(pctldev->dev); |
| } |
| |
| device_root = debugfs_create_dir(debugfs_name, debugfs_root); |
| pctldev->device_root = device_root; |
| |
| if (IS_ERR(device_root) || !device_root) { |
| pr_warn("failed to create debugfs directory for %s\n", |
| dev_name(pctldev->dev)); |
| return; |
| } |
| debugfs_create_file("pins", S_IFREG | S_IRUGO, |
| device_root, pctldev, &pinctrl_pins_fops); |
| debugfs_create_file("pingroups", S_IFREG | S_IRUGO, |
| device_root, pctldev, &pinctrl_groups_fops); |
| debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, |
| device_root, pctldev, &pinctrl_gpioranges_fops); |
| if (pctldev->desc->pmxops) |
| pinmux_init_device_debugfs(device_root, pctldev); |
| if (pctldev->desc->confops) |
| pinconf_init_device_debugfs(device_root, pctldev); |
| } |
| |
| static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
| { |
| debugfs_remove_recursive(pctldev->device_root); |
| } |
| |
| static void pinctrl_init_debugfs(void) |
| { |
| debugfs_root = debugfs_create_dir("pinctrl", NULL); |
| if (IS_ERR(debugfs_root) || !debugfs_root) { |
| pr_warn("failed to create debugfs directory\n"); |
| debugfs_root = NULL; |
| return; |
| } |
| |
| debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, |
| debugfs_root, NULL, &pinctrl_devices_fops); |
| debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, |
| debugfs_root, NULL, &pinctrl_maps_fops); |
| debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, |
| debugfs_root, NULL, &pinctrl_fops); |
| } |
| |
| #else /* CONFIG_DEBUG_FS */ |
| |
| static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) |
| { |
| } |
| |
| static void pinctrl_init_debugfs(void) |
| { |
| } |
| |
| static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
| { |
| } |
| |
| #endif |
| |
| static int pinctrl_check_ops(struct pinctrl_dev *pctldev) |
| { |
| const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
| |
| if (!ops || |
| !ops->get_groups_count || |
| !ops->get_group_name) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| /** |
| * pinctrl_init_controller() - init a pin controller device |
| * @pctldesc: descriptor for this pin controller |
| * @dev: parent device for this pin controller |
| * @driver_data: private pin controller data for this pin controller |
| */ |
| static struct pinctrl_dev * |
| pinctrl_init_controller(struct pinctrl_desc *pctldesc, struct device *dev, |
| void *driver_data) |
| { |
| struct pinctrl_dev *pctldev; |
| int ret; |
| |
| if (!pctldesc) |
| return ERR_PTR(-EINVAL); |
| if (!pctldesc->name) |
| return ERR_PTR(-EINVAL); |
| |
| pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL); |
| if (!pctldev) |
| return ERR_PTR(-ENOMEM); |
| |
| /* Initialize pin control device struct */ |
| pctldev->owner = pctldesc->owner; |
| pctldev->desc = pctldesc; |
| pctldev->driver_data = driver_data; |
| INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); |
| #ifdef CONFIG_GENERIC_PINCTRL_GROUPS |
| INIT_RADIX_TREE(&pctldev->pin_group_tree, GFP_KERNEL); |
| #endif |
| #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS |
| INIT_RADIX_TREE(&pctldev->pin_function_tree, GFP_KERNEL); |
| #endif |
| INIT_LIST_HEAD(&pctldev->gpio_ranges); |
| INIT_LIST_HEAD(&pctldev->node); |
| pctldev->dev = dev; |
| mutex_init(&pctldev->mutex); |
| |
| /* check core ops for sanity */ |
| ret = pinctrl_check_ops(pctldev); |
| if (ret) { |
| dev_err(dev, "pinctrl ops lacks necessary functions\n"); |
| goto out_err; |
| } |
| |
| /* If we're implementing pinmuxing, check the ops for sanity */ |
| if (pctldesc->pmxops) { |
| ret = pinmux_check_ops(pctldev); |
| if (ret) |
| goto out_err; |
| } |
| |
| /* If we're implementing pinconfig, check the ops for sanity */ |
| if (pctldesc->confops) { |
| ret = pinconf_check_ops(pctldev); |
| if (ret) |
| goto out_err; |
| } |
| |
| /* Register all the pins */ |
| dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins); |
| ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); |
| if (ret) { |
| dev_err(dev, "error during pin registration\n"); |
| pinctrl_free_pindescs(pctldev, pctldesc->pins, |
| pctldesc->npins); |
| goto out_err; |
| } |
| |
| return pctldev; |
| |
| out_err: |
| mutex_destroy(&pctldev->mutex); |
| kfree(pctldev); |
| return ERR_PTR(ret); |
| } |
| |
| static int pinctrl_claim_hogs(struct pinctrl_dev *pctldev) |
| { |
| pctldev->p = create_pinctrl(pctldev->dev, pctldev); |
| if (PTR_ERR(pctldev->p) == -ENODEV) { |
| dev_dbg(pctldev->dev, "no hogs found\n"); |
| |
| return 0; |
| } |
| |
| if (IS_ERR(pctldev->p)) { |
| dev_err(pctldev->dev, "error claiming hogs: %li\n", |
| PTR_ERR(pctldev->p)); |
| |
| return PTR_ERR(pctldev->p); |
| } |
| |
| pctldev->hog_default = |
| pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT); |
| if (IS_ERR(pctldev->hog_default)) { |
| dev_dbg(pctldev->dev, |
| "failed to lookup the default state\n"); |
| } else { |
| if (pinctrl_select_state(pctldev->p, |
| pctldev->hog_default)) |
| dev_err(pctldev->dev, |
| "failed to select default state\n"); |
| } |
| |
| pctldev->hog_sleep = |
| pinctrl_lookup_state(pctldev->p, |
| PINCTRL_STATE_SLEEP); |
| if (IS_ERR(pctldev->hog_sleep)) |
| dev_dbg(pctldev->dev, |
| "failed to lookup the sleep state\n"); |
| |
| return 0; |
| } |
| |
| int pinctrl_enable(struct pinctrl_dev *pctldev) |
| { |
| int error; |
| |
| error = pinctrl_claim_hogs(pctldev); |
| if (error) { |
| dev_err(pctldev->dev, "could not claim hogs: %i\n", |
| error); |
| mutex_destroy(&pctldev->mutex); |
| kfree(pctldev); |
| |
| return error; |
| } |
| |
| mutex_lock(&pinctrldev_list_mutex); |
| list_add_tail(&pctldev->node, &pinctrldev_list); |
| mutex_unlock(&pinctrldev_list_mutex); |
| |
| pinctrl_init_device_debugfs(pctldev); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_enable); |
| |
| /** |
| * pinctrl_register() - register a pin controller device |
| * @pctldesc: descriptor for this pin controller |
| * @dev: parent device for this pin controller |
| * @driver_data: private pin controller data for this pin controller |
| * |
| * Note that pinctrl_register() is known to have problems as the pin |
| * controller driver functions are called before the driver has a |
| * struct pinctrl_dev handle. To avoid issues later on, please use the |
| * new pinctrl_register_and_init() below instead. |
| */ |
| struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, |
| struct device *dev, void *driver_data) |
| { |
| struct pinctrl_dev *pctldev; |
| int error; |
| |
| pctldev = pinctrl_init_controller(pctldesc, dev, driver_data); |
| if (IS_ERR(pctldev)) |
| return pctldev; |
| |
| error = pinctrl_enable(pctldev); |
| if (error) |
| return ERR_PTR(error); |
| |
| return pctldev; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_register); |
| |
| /** |
| * pinctrl_register_and_init() - register and init pin controller device |
| * @pctldesc: descriptor for this pin controller |
| * @dev: parent device for this pin controller |
| * @driver_data: private pin controller data for this pin controller |
| * @pctldev: pin controller device |
| * |
| * Note that pinctrl_enable() still needs to be manually called after |
| * this once the driver is ready. |
| */ |
| int pinctrl_register_and_init(struct pinctrl_desc *pctldesc, |
| struct device *dev, void *driver_data, |
| struct pinctrl_dev **pctldev) |
| { |
| struct pinctrl_dev *p; |
| |
| p = pinctrl_init_controller(pctldesc, dev, driver_data); |
| if (IS_ERR(p)) |
| return PTR_ERR(p); |
| |
| /* |
| * We have pinctrl_start() call functions in the pin controller |
| * driver with create_pinctrl() for at least dt_node_to_map(). So |
| * let's make sure pctldev is properly initialized for the |
| * pin controller driver before we do anything. |
| */ |
| *pctldev = p; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_register_and_init); |
| |
| /** |
| * pinctrl_unregister() - unregister pinmux |
| * @pctldev: pin controller to unregister |
| * |
| * Called by pinmux drivers to unregister a pinmux. |
| */ |
| void pinctrl_unregister(struct pinctrl_dev *pctldev) |
| { |
| struct pinctrl_gpio_range *range, *n; |
| |
| if (!pctldev) |
| return; |
| |
| mutex_lock(&pctldev->mutex); |
| pinctrl_remove_device_debugfs(pctldev); |
| mutex_unlock(&pctldev->mutex); |
| |
| if (!IS_ERR_OR_NULL(pctldev->p)) |
| pinctrl_put(pctldev->p); |
| |
| mutex_lock(&pinctrldev_list_mutex); |
| mutex_lock(&pctldev->mutex); |
| /* TODO: check that no pinmuxes are still active? */ |
| list_del(&pctldev->node); |
| pinmux_generic_free_functions(pctldev); |
| pinctrl_generic_free_groups(pctldev); |
| /* Destroy descriptor tree */ |
| pinctrl_free_pindescs(pctldev, pctldev->desc->pins, |
| pctldev->desc->npins); |
| /* remove gpio ranges map */ |
| list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node) |
| list_del(&range->node); |
| |
| mutex_unlock(&pctldev->mutex); |
| mutex_destroy(&pctldev->mutex); |
| kfree(pctldev); |
| mutex_unlock(&pinctrldev_list_mutex); |
| } |
| EXPORT_SYMBOL_GPL(pinctrl_unregister); |
| |
| static void devm_pinctrl_dev_release(struct device *dev, void *res) |
| { |
| struct pinctrl_dev *pctldev = *(struct pinctrl_dev **)res; |
| |
| pinctrl_unregister(pctldev); |
| } |
| |
| static int devm_pinctrl_dev_match(struct device *dev, void *res, void *data) |
| { |
| struct pctldev **r = res; |
| |
| if (WARN_ON(!r || !*r)) |
| return 0; |
| |
| return *r == data; |
| } |
| |
| /** |
| * devm_pinctrl_register() - Resource managed version of pinctrl_register(). |
| * @dev: parent device for this pin controller |
| * @pctldesc: descriptor for this pin controller |
| * @driver_data: private pin controller data for this pin controller |
| * |
| * Returns an error pointer if pincontrol register failed. Otherwise |
| * it returns valid pinctrl handle. |
| * |
| * The pinctrl device will be automatically released when the device is unbound. |
| */ |
| struct pinctrl_dev *devm_pinctrl_register(struct device *dev, |
| struct pinctrl_desc *pctldesc, |
| void *driver_data) |
| { |
| struct pinctrl_dev **ptr, *pctldev; |
| |
| ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return ERR_PTR(-ENOMEM); |
| |
| pctldev = pinctrl_register(pctldesc, dev, driver_data); |
| if (IS_ERR(pctldev)) { |
| devres_free(ptr); |
| return pctldev; |
| } |
| |
| *ptr = pctldev; |
| devres_add(dev, ptr); |
| |
| return pctldev; |
| } |
| EXPORT_SYMBOL_GPL(devm_pinctrl_register); |
| |
| /** |
| * devm_pinctrl_register_and_init() - Resource managed pinctrl register and init |
| * @dev: parent device for this pin controller |
| * @pctldesc: descriptor for this pin controller |
| * @driver_data: private pin controller data for this pin controller |
| * @pctldev: pin controller device |
| * |
| * Returns zero on success or an error number on failure. |
| * |
| * The pinctrl device will be automatically released when the device is unbound. |
| */ |
| int devm_pinctrl_register_and_init(struct device *dev, |
| struct pinctrl_desc *pctldesc, |
| void *driver_data, |
| struct pinctrl_dev **pctldev) |
| { |
| struct pinctrl_dev **ptr; |
| int error; |
| |
| ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL); |
| if (!ptr) |
| return -ENOMEM; |
| |
| error = pinctrl_register_and_init(pctldesc, dev, driver_data, pctldev); |
| if (error) { |
| devres_free(ptr); |
| return error; |
| } |
| |
| *ptr = *pctldev; |
| devres_add(dev, ptr); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init); |
| |
| /** |
| * devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister(). |
| * @dev: device for which which resource was allocated |
| * @pctldev: the pinctrl device to unregister. |
| */ |
| void devm_pinctrl_unregister(struct device *dev, struct pinctrl_dev *pctldev) |
| { |
| WARN_ON(devres_release(dev, devm_pinctrl_dev_release, |
| devm_pinctrl_dev_match, pctldev)); |
| } |
| EXPORT_SYMBOL_GPL(devm_pinctrl_unregister); |
| |
| static int __init pinctrl_init(void) |
| { |
| pr_info("initialized pinctrl subsystem\n"); |
| pinctrl_init_debugfs(); |
| return 0; |
| } |
| |
| /* init early since many drivers really need to initialized pinmux early */ |
| core_initcall(pinctrl_init); |