| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * drivers/usb/core/sysfs.c |
| * |
| * (C) Copyright 2002 David Brownell |
| * (C) Copyright 2002,2004 Greg Kroah-Hartman |
| * (C) Copyright 2002,2004 IBM Corp. |
| * |
| * All of the sysfs file attributes for usb devices and interfaces. |
| * |
| * Released under the GPLv2 only. |
| */ |
| |
| |
| #include <linux/kernel.h> |
| #include <linux/kstrtox.h> |
| #include <linux/string.h> |
| #include <linux/usb.h> |
| #include <linux/usb/hcd.h> |
| #include <linux/usb/quirks.h> |
| #include <linux/of.h> |
| #include "usb.h" |
| |
| /* Active configuration fields */ |
| #define usb_actconfig_show(field, format_string) \ |
| static ssize_t field##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| struct usb_device *udev; \ |
| struct usb_host_config *actconfig; \ |
| ssize_t rc; \ |
| \ |
| udev = to_usb_device(dev); \ |
| rc = usb_lock_device_interruptible(udev); \ |
| if (rc < 0) \ |
| return -EINTR; \ |
| actconfig = udev->actconfig; \ |
| if (actconfig) \ |
| rc = sysfs_emit(buf, format_string, \ |
| actconfig->desc.field); \ |
| usb_unlock_device(udev); \ |
| return rc; \ |
| } \ |
| |
| #define usb_actconfig_attr(field, format_string) \ |
| usb_actconfig_show(field, format_string) \ |
| static DEVICE_ATTR_RO(field) |
| |
| usb_actconfig_attr(bNumInterfaces, "%2d\n"); |
| usb_actconfig_attr(bmAttributes, "%2x\n"); |
| |
| static ssize_t bMaxPower_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *udev; |
| struct usb_host_config *actconfig; |
| ssize_t rc; |
| |
| udev = to_usb_device(dev); |
| rc = usb_lock_device_interruptible(udev); |
| if (rc < 0) |
| return -EINTR; |
| actconfig = udev->actconfig; |
| if (actconfig) |
| rc = sysfs_emit(buf, "%dmA\n", usb_get_max_power(udev, actconfig)); |
| usb_unlock_device(udev); |
| return rc; |
| } |
| static DEVICE_ATTR_RO(bMaxPower); |
| |
| static ssize_t configuration_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *udev; |
| struct usb_host_config *actconfig; |
| ssize_t rc; |
| |
| udev = to_usb_device(dev); |
| rc = usb_lock_device_interruptible(udev); |
| if (rc < 0) |
| return -EINTR; |
| actconfig = udev->actconfig; |
| if (actconfig && actconfig->string) |
| rc = sysfs_emit(buf, "%s\n", actconfig->string); |
| usb_unlock_device(udev); |
| return rc; |
| } |
| static DEVICE_ATTR_RO(configuration); |
| |
| /* configuration value is always present, and r/w */ |
| usb_actconfig_show(bConfigurationValue, "%u\n"); |
| |
| static ssize_t bConfigurationValue_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| int config, value, rc; |
| |
| if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255) |
| return -EINVAL; |
| rc = usb_lock_device_interruptible(udev); |
| if (rc < 0) |
| return -EINTR; |
| value = usb_set_configuration(udev, config); |
| usb_unlock_device(udev); |
| return (value < 0) ? value : count; |
| } |
| static DEVICE_ATTR_IGNORE_LOCKDEP(bConfigurationValue, S_IRUGO | S_IWUSR, |
| bConfigurationValue_show, bConfigurationValue_store); |
| |
| #ifdef CONFIG_OF |
| static ssize_t devspec_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct device_node *of_node = dev->of_node; |
| |
| return sysfs_emit(buf, "%pOF\n", of_node); |
| } |
| static DEVICE_ATTR_RO(devspec); |
| #endif |
| |
| /* String fields */ |
| #define usb_string_attr(name) \ |
| static ssize_t name##_show(struct device *dev, \ |
| struct device_attribute *attr, char *buf) \ |
| { \ |
| struct usb_device *udev; \ |
| int retval; \ |
| \ |
| udev = to_usb_device(dev); \ |
| retval = usb_lock_device_interruptible(udev); \ |
| if (retval < 0) \ |
| return -EINTR; \ |
| retval = sysfs_emit(buf, "%s\n", udev->name); \ |
| usb_unlock_device(udev); \ |
| return retval; \ |
| } \ |
| static DEVICE_ATTR_RO(name) |
| |
| usb_string_attr(product); |
| usb_string_attr(manufacturer); |
| usb_string_attr(serial); |
| |
| static ssize_t speed_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| char *speed; |
| |
| udev = to_usb_device(dev); |
| |
| switch (udev->speed) { |
| case USB_SPEED_LOW: |
| speed = "1.5"; |
| break; |
| case USB_SPEED_UNKNOWN: |
| case USB_SPEED_FULL: |
| speed = "12"; |
| break; |
| case USB_SPEED_HIGH: |
| speed = "480"; |
| break; |
| case USB_SPEED_SUPER: |
| speed = "5000"; |
| break; |
| case USB_SPEED_SUPER_PLUS: |
| if (udev->ssp_rate == USB_SSP_GEN_2x2) |
| speed = "20000"; |
| else |
| speed = "10000"; |
| break; |
| default: |
| speed = "unknown"; |
| } |
| return sysfs_emit(buf, "%s\n", speed); |
| } |
| static DEVICE_ATTR_RO(speed); |
| |
| static ssize_t rx_lanes_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%d\n", udev->rx_lanes); |
| } |
| static DEVICE_ATTR_RO(rx_lanes); |
| |
| static ssize_t tx_lanes_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%d\n", udev->tx_lanes); |
| } |
| static DEVICE_ATTR_RO(tx_lanes); |
| |
| static ssize_t busnum_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%d\n", udev->bus->busnum); |
| } |
| static DEVICE_ATTR_RO(busnum); |
| |
| static ssize_t devnum_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%d\n", udev->devnum); |
| } |
| static DEVICE_ATTR_RO(devnum); |
| |
| static ssize_t devpath_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%s\n", udev->devpath); |
| } |
| static DEVICE_ATTR_RO(devpath); |
| |
| static ssize_t version_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| u16 bcdUSB; |
| |
| udev = to_usb_device(dev); |
| bcdUSB = le16_to_cpu(udev->descriptor.bcdUSB); |
| return sysfs_emit(buf, "%2x.%02x\n", bcdUSB >> 8, bcdUSB & 0xff); |
| } |
| static DEVICE_ATTR_RO(version); |
| |
| static ssize_t maxchild_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%d\n", udev->maxchild); |
| } |
| static DEVICE_ATTR_RO(maxchild); |
| |
| static ssize_t quirks_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| return sysfs_emit(buf, "0x%x\n", udev->quirks); |
| } |
| static DEVICE_ATTR_RO(quirks); |
| |
| static ssize_t avoid_reset_quirk_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%d\n", !!(udev->quirks & USB_QUIRK_RESET)); |
| } |
| |
| static ssize_t avoid_reset_quirk_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| bool val; |
| int rc; |
| |
| if (kstrtobool(buf, &val) != 0) |
| return -EINVAL; |
| rc = usb_lock_device_interruptible(udev); |
| if (rc < 0) |
| return -EINTR; |
| if (val) |
| udev->quirks |= USB_QUIRK_RESET; |
| else |
| udev->quirks &= ~USB_QUIRK_RESET; |
| usb_unlock_device(udev); |
| return count; |
| } |
| static DEVICE_ATTR_RW(avoid_reset_quirk); |
| |
| static ssize_t urbnum_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev; |
| |
| udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%d\n", atomic_read(&udev->urbnum)); |
| } |
| static DEVICE_ATTR_RO(urbnum); |
| |
| static ssize_t ltm_capable_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| if (usb_device_supports_ltm(to_usb_device(dev))) |
| return sysfs_emit(buf, "%s\n", "yes"); |
| return sysfs_emit(buf, "%s\n", "no"); |
| } |
| static DEVICE_ATTR_RO(ltm_capable); |
| |
| #ifdef CONFIG_PM |
| |
| static ssize_t persist_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| |
| return sysfs_emit(buf, "%d\n", udev->persist_enabled); |
| } |
| |
| static ssize_t persist_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| bool value; |
| int rc; |
| |
| /* Hubs are always enabled for USB_PERSIST */ |
| if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) |
| return -EPERM; |
| |
| if (kstrtobool(buf, &value) != 0) |
| return -EINVAL; |
| |
| rc = usb_lock_device_interruptible(udev); |
| if (rc < 0) |
| return -EINTR; |
| udev->persist_enabled = !!value; |
| usb_unlock_device(udev); |
| return count; |
| } |
| static DEVICE_ATTR_RW(persist); |
| |
| static int add_persist_attributes(struct device *dev) |
| { |
| int rc = 0; |
| |
| if (is_usb_device(dev)) { |
| struct usb_device *udev = to_usb_device(dev); |
| |
| /* Hubs are automatically enabled for USB_PERSIST, |
| * no point in creating the attribute file. |
| */ |
| if (udev->descriptor.bDeviceClass != USB_CLASS_HUB) |
| rc = sysfs_add_file_to_group(&dev->kobj, |
| &dev_attr_persist.attr, |
| power_group_name); |
| } |
| return rc; |
| } |
| |
| static void remove_persist_attributes(struct device *dev) |
| { |
| sysfs_remove_file_from_group(&dev->kobj, |
| &dev_attr_persist.attr, |
| power_group_name); |
| } |
| |
| static ssize_t connected_duration_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| |
| return sysfs_emit(buf, "%u\n", |
| jiffies_to_msecs(jiffies - udev->connect_time)); |
| } |
| static DEVICE_ATTR_RO(connected_duration); |
| |
| /* |
| * If the device is resumed, the last time the device was suspended has |
| * been pre-subtracted from active_duration. We add the current time to |
| * get the duration that the device was actually active. |
| * |
| * If the device is suspended, the active_duration is up-to-date. |
| */ |
| static ssize_t active_duration_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| int duration; |
| |
| if (udev->state != USB_STATE_SUSPENDED) |
| duration = jiffies_to_msecs(jiffies + udev->active_duration); |
| else |
| duration = jiffies_to_msecs(udev->active_duration); |
| return sysfs_emit(buf, "%u\n", duration); |
| } |
| static DEVICE_ATTR_RO(active_duration); |
| |
| static ssize_t autosuspend_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| return sysfs_emit(buf, "%d\n", dev->power.autosuspend_delay / 1000); |
| } |
| |
| static ssize_t autosuspend_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, |
| size_t count) |
| { |
| int value; |
| |
| if (sscanf(buf, "%d", &value) != 1 || value >= INT_MAX/1000 || |
| value <= -INT_MAX/1000) |
| return -EINVAL; |
| |
| pm_runtime_set_autosuspend_delay(dev, value * 1000); |
| return count; |
| } |
| static DEVICE_ATTR_RW(autosuspend); |
| |
| static const char on_string[] = "on"; |
| static const char auto_string[] = "auto"; |
| |
| static void warn_level(void) |
| { |
| static int level_warned; |
| |
| if (!level_warned) { |
| level_warned = 1; |
| printk(KERN_WARNING "WARNING! power/level is deprecated; " |
| "use power/control instead\n"); |
| } |
| } |
| |
| static ssize_t level_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| const char *p = auto_string; |
| |
| warn_level(); |
| if (udev->state != USB_STATE_SUSPENDED && !udev->dev.power.runtime_auto) |
| p = on_string; |
| return sysfs_emit(buf, "%s\n", p); |
| } |
| |
| static ssize_t level_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| int len = count; |
| char *cp; |
| int rc = count; |
| int rv; |
| |
| warn_level(); |
| cp = memchr(buf, '\n', count); |
| if (cp) |
| len = cp - buf; |
| |
| rv = usb_lock_device_interruptible(udev); |
| if (rv < 0) |
| return -EINTR; |
| |
| if (len == sizeof on_string - 1 && |
| strncmp(buf, on_string, len) == 0) |
| usb_disable_autosuspend(udev); |
| |
| else if (len == sizeof auto_string - 1 && |
| strncmp(buf, auto_string, len) == 0) |
| usb_enable_autosuspend(udev); |
| |
| else |
| rc = -EINVAL; |
| |
| usb_unlock_device(udev); |
| return rc; |
| } |
| static DEVICE_ATTR_RW(level); |
| |
| static ssize_t usb2_hardware_lpm_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| const char *p; |
| |
| if (udev->usb2_hw_lpm_allowed == 1) |
| p = "enabled"; |
| else |
| p = "disabled"; |
| |
| return sysfs_emit(buf, "%s\n", p); |
| } |
| |
| static ssize_t usb2_hardware_lpm_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| bool value; |
| int ret; |
| |
| ret = usb_lock_device_interruptible(udev); |
| if (ret < 0) |
| return -EINTR; |
| |
| ret = kstrtobool(buf, &value); |
| |
| if (!ret) { |
| udev->usb2_hw_lpm_allowed = value; |
| if (value) |
| ret = usb_enable_usb2_hardware_lpm(udev); |
| else |
| ret = usb_disable_usb2_hardware_lpm(udev); |
| } |
| |
| usb_unlock_device(udev); |
| |
| if (!ret) |
| return count; |
| |
| return ret; |
| } |
| static DEVICE_ATTR_RW(usb2_hardware_lpm); |
| |
| static ssize_t usb2_lpm_l1_timeout_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%d\n", udev->l1_params.timeout); |
| } |
| |
| static ssize_t usb2_lpm_l1_timeout_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| u16 timeout; |
| |
| if (kstrtou16(buf, 0, &timeout)) |
| return -EINVAL; |
| |
| udev->l1_params.timeout = timeout; |
| |
| return count; |
| } |
| static DEVICE_ATTR_RW(usb2_lpm_l1_timeout); |
| |
| static ssize_t usb2_lpm_besl_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| return sysfs_emit(buf, "%d\n", udev->l1_params.besl); |
| } |
| |
| static ssize_t usb2_lpm_besl_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| u8 besl; |
| |
| if (kstrtou8(buf, 0, &besl) || besl > 15) |
| return -EINVAL; |
| |
| udev->l1_params.besl = besl; |
| |
| return count; |
| } |
| static DEVICE_ATTR_RW(usb2_lpm_besl); |
| |
| static ssize_t usb3_hardware_lpm_u1_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| const char *p; |
| int rc; |
| |
| rc = usb_lock_device_interruptible(udev); |
| if (rc < 0) |
| return -EINTR; |
| |
| if (udev->usb3_lpm_u1_enabled) |
| p = "enabled"; |
| else |
| p = "disabled"; |
| |
| usb_unlock_device(udev); |
| |
| return sysfs_emit(buf, "%s\n", p); |
| } |
| static DEVICE_ATTR_RO(usb3_hardware_lpm_u1); |
| |
| static ssize_t usb3_hardware_lpm_u2_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| const char *p; |
| int rc; |
| |
| rc = usb_lock_device_interruptible(udev); |
| if (rc < 0) |
| return -EINTR; |
| |
| if (udev->usb3_lpm_u2_enabled) |
| p = "enabled"; |
| else |
| p = "disabled"; |
| |
| usb_unlock_device(udev); |
| |
| return sysfs_emit(buf, "%s\n", p); |
| } |
| static DEVICE_ATTR_RO(usb3_hardware_lpm_u2); |
| |
| static struct attribute *usb2_hardware_lpm_attr[] = { |
| &dev_attr_usb2_hardware_lpm.attr, |
| &dev_attr_usb2_lpm_l1_timeout.attr, |
| &dev_attr_usb2_lpm_besl.attr, |
| NULL, |
| }; |
| static const struct attribute_group usb2_hardware_lpm_attr_group = { |
| .name = power_group_name, |
| .attrs = usb2_hardware_lpm_attr, |
| }; |
| |
| static struct attribute *usb3_hardware_lpm_attr[] = { |
| &dev_attr_usb3_hardware_lpm_u1.attr, |
| &dev_attr_usb3_hardware_lpm_u2.attr, |
| NULL, |
| }; |
| static const struct attribute_group usb3_hardware_lpm_attr_group = { |
| .name = power_group_name, |
| .attrs = usb3_hardware_lpm_attr, |
| }; |
| |
| static struct attribute *power_attrs[] = { |
| &dev_attr_autosuspend.attr, |
| &dev_attr_level.attr, |
| &dev_attr_connected_duration.attr, |
| &dev_attr_active_duration.attr, |
| NULL, |
| }; |
| static const struct attribute_group power_attr_group = { |
| .name = power_group_name, |
| .attrs = power_attrs, |
| }; |
| |
| static int add_power_attributes(struct device *dev) |
| { |
| int rc = 0; |
| |
| if (is_usb_device(dev)) { |
| struct usb_device *udev = to_usb_device(dev); |
| rc = sysfs_merge_group(&dev->kobj, &power_attr_group); |
| if (udev->usb2_hw_lpm_capable == 1) |
| rc = sysfs_merge_group(&dev->kobj, |
| &usb2_hardware_lpm_attr_group); |
| if ((udev->speed == USB_SPEED_SUPER || |
| udev->speed == USB_SPEED_SUPER_PLUS) && |
| udev->lpm_capable == 1) |
| rc = sysfs_merge_group(&dev->kobj, |
| &usb3_hardware_lpm_attr_group); |
| } |
| |
| return rc; |
| } |
| |
| static void remove_power_attributes(struct device *dev) |
| { |
| sysfs_unmerge_group(&dev->kobj, &usb3_hardware_lpm_attr_group); |
| sysfs_unmerge_group(&dev->kobj, &usb2_hardware_lpm_attr_group); |
| sysfs_unmerge_group(&dev->kobj, &power_attr_group); |
| } |
| |
| #else |
| |
| #define add_persist_attributes(dev) 0 |
| #define remove_persist_attributes(dev) do {} while (0) |
| |
| #define add_power_attributes(dev) 0 |
| #define remove_power_attributes(dev) do {} while (0) |
| |
| #endif /* CONFIG_PM */ |
| |
| |
| /* Descriptor fields */ |
| #define usb_descriptor_attr_le16(field, format_string) \ |
| static ssize_t \ |
| field##_show(struct device *dev, struct device_attribute *attr, \ |
| char *buf) \ |
| { \ |
| struct usb_device *udev; \ |
| \ |
| udev = to_usb_device(dev); \ |
| return sysfs_emit(buf, format_string, \ |
| le16_to_cpu(udev->descriptor.field)); \ |
| } \ |
| static DEVICE_ATTR_RO(field) |
| |
| usb_descriptor_attr_le16(idVendor, "%04x\n"); |
| usb_descriptor_attr_le16(idProduct, "%04x\n"); |
| usb_descriptor_attr_le16(bcdDevice, "%04x\n"); |
| |
| #define usb_descriptor_attr(field, format_string) \ |
| static ssize_t \ |
| field##_show(struct device *dev, struct device_attribute *attr, \ |
| char *buf) \ |
| { \ |
| struct usb_device *udev; \ |
| \ |
| udev = to_usb_device(dev); \ |
| return sysfs_emit(buf, format_string, udev->descriptor.field); \ |
| } \ |
| static DEVICE_ATTR_RO(field) |
| |
| usb_descriptor_attr(bDeviceClass, "%02x\n"); |
| usb_descriptor_attr(bDeviceSubClass, "%02x\n"); |
| usb_descriptor_attr(bDeviceProtocol, "%02x\n"); |
| usb_descriptor_attr(bNumConfigurations, "%d\n"); |
| usb_descriptor_attr(bMaxPacketSize0, "%d\n"); |
| |
| |
| /* show if the device is authorized (1) or not (0) */ |
| static ssize_t authorized_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *usb_dev = to_usb_device(dev); |
| return sysfs_emit(buf, "%u\n", usb_dev->authorized); |
| } |
| |
| /* |
| * Authorize a device to be used in the system |
| * |
| * Writing a 0 deauthorizes the device, writing a 1 authorizes it. |
| */ |
| static ssize_t authorized_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, |
| size_t size) |
| { |
| ssize_t result; |
| struct usb_device *usb_dev = to_usb_device(dev); |
| bool val; |
| |
| if (kstrtobool(buf, &val) != 0) |
| result = -EINVAL; |
| else if (val) |
| result = usb_authorize_device(usb_dev); |
| else |
| result = usb_deauthorize_device(usb_dev); |
| return result < 0 ? result : size; |
| } |
| static DEVICE_ATTR_IGNORE_LOCKDEP(authorized, S_IRUGO | S_IWUSR, |
| authorized_show, authorized_store); |
| |
| /* "Safely remove a device" */ |
| static ssize_t remove_store(struct device *dev, struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct usb_device *udev = to_usb_device(dev); |
| int rc = 0; |
| |
| usb_lock_device(udev); |
| if (udev->state != USB_STATE_NOTATTACHED) { |
| |
| /* To avoid races, first unconfigure and then remove */ |
| usb_set_configuration(udev, -1); |
| rc = usb_remove_device(udev); |
| } |
| if (rc == 0) |
| rc = count; |
| usb_unlock_device(udev); |
| return rc; |
| } |
| static DEVICE_ATTR_IGNORE_LOCKDEP(remove, S_IWUSR, NULL, remove_store); |
| |
| |
| static struct attribute *dev_attrs[] = { |
| /* current configuration's attributes */ |
| &dev_attr_configuration.attr, |
| &dev_attr_bNumInterfaces.attr, |
| &dev_attr_bConfigurationValue.attr, |
| &dev_attr_bmAttributes.attr, |
| &dev_attr_bMaxPower.attr, |
| /* device attributes */ |
| &dev_attr_urbnum.attr, |
| &dev_attr_idVendor.attr, |
| &dev_attr_idProduct.attr, |
| &dev_attr_bcdDevice.attr, |
| &dev_attr_bDeviceClass.attr, |
| &dev_attr_bDeviceSubClass.attr, |
| &dev_attr_bDeviceProtocol.attr, |
| &dev_attr_bNumConfigurations.attr, |
| &dev_attr_bMaxPacketSize0.attr, |
| &dev_attr_speed.attr, |
| &dev_attr_rx_lanes.attr, |
| &dev_attr_tx_lanes.attr, |
| &dev_attr_busnum.attr, |
| &dev_attr_devnum.attr, |
| &dev_attr_devpath.attr, |
| &dev_attr_version.attr, |
| &dev_attr_maxchild.attr, |
| &dev_attr_quirks.attr, |
| &dev_attr_avoid_reset_quirk.attr, |
| &dev_attr_authorized.attr, |
| &dev_attr_remove.attr, |
| &dev_attr_ltm_capable.attr, |
| #ifdef CONFIG_OF |
| &dev_attr_devspec.attr, |
| #endif |
| NULL, |
| }; |
| static const struct attribute_group dev_attr_grp = { |
| .attrs = dev_attrs, |
| }; |
| |
| /* When modifying this list, be sure to modify dev_string_attrs_are_visible() |
| * accordingly. |
| */ |
| static struct attribute *dev_string_attrs[] = { |
| &dev_attr_manufacturer.attr, |
| &dev_attr_product.attr, |
| &dev_attr_serial.attr, |
| NULL |
| }; |
| |
| static umode_t dev_string_attrs_are_visible(struct kobject *kobj, |
| struct attribute *a, int n) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct usb_device *udev = to_usb_device(dev); |
| |
| if (a == &dev_attr_manufacturer.attr) { |
| if (udev->manufacturer == NULL) |
| return 0; |
| } else if (a == &dev_attr_product.attr) { |
| if (udev->product == NULL) |
| return 0; |
| } else if (a == &dev_attr_serial.attr) { |
| if (udev->serial == NULL) |
| return 0; |
| } |
| return a->mode; |
| } |
| |
| static const struct attribute_group dev_string_attr_grp = { |
| .attrs = dev_string_attrs, |
| .is_visible = dev_string_attrs_are_visible, |
| }; |
| |
| /* Binary descriptors */ |
| |
| static ssize_t |
| descriptors_read(struct file *filp, struct kobject *kobj, |
| struct bin_attribute *attr, |
| char *buf, loff_t off, size_t count) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct usb_device *udev = to_usb_device(dev); |
| size_t nleft = count; |
| size_t srclen, n; |
| int cfgno; |
| void *src; |
| |
| /* The binary attribute begins with the device descriptor. |
| * Following that are the raw descriptor entries for all the |
| * configurations (config plus subsidiary descriptors). |
| */ |
| for (cfgno = -1; cfgno < udev->descriptor.bNumConfigurations && |
| nleft > 0; ++cfgno) { |
| if (cfgno < 0) { |
| src = &udev->descriptor; |
| srclen = sizeof(struct usb_device_descriptor); |
| } else { |
| src = udev->rawdescriptors[cfgno]; |
| srclen = le16_to_cpu(udev->config[cfgno].desc. |
| wTotalLength); |
| } |
| if (off < srclen) { |
| n = min(nleft, srclen - (size_t) off); |
| memcpy(buf, src + off, n); |
| nleft -= n; |
| buf += n; |
| off = 0; |
| } else { |
| off -= srclen; |
| } |
| } |
| return count - nleft; |
| } |
| static BIN_ATTR_RO(descriptors, 18 + 65535); /* dev descr + max-size raw descriptor */ |
| |
| static ssize_t |
| bos_descriptors_read(struct file *filp, struct kobject *kobj, |
| struct bin_attribute *attr, |
| char *buf, loff_t off, size_t count) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct usb_device *udev = to_usb_device(dev); |
| struct usb_host_bos *bos = udev->bos; |
| struct usb_bos_descriptor *desc; |
| size_t desclen, n = 0; |
| |
| if (bos) { |
| desc = bos->desc; |
| desclen = le16_to_cpu(desc->wTotalLength); |
| if (off < desclen) { |
| n = min(count, desclen - (size_t) off); |
| memcpy(buf, (void *) desc + off, n); |
| } |
| } |
| return n; |
| } |
| static BIN_ATTR_RO(bos_descriptors, 65535); /* max-size BOS */ |
| |
| /* When modifying this list, be sure to modify dev_bin_attrs_are_visible() |
| * accordingly. |
| */ |
| static struct bin_attribute *dev_bin_attrs[] = { |
| &bin_attr_descriptors, |
| &bin_attr_bos_descriptors, |
| NULL |
| }; |
| |
| static umode_t dev_bin_attrs_are_visible(struct kobject *kobj, |
| struct bin_attribute *a, int n) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct usb_device *udev = to_usb_device(dev); |
| |
| /* |
| * There's no need to check if the descriptors attribute should |
| * be visible because all devices have a device descriptor. The |
| * bos_descriptors attribute should be visible if and only if |
| * the device has a BOS, so check if it exists here. |
| */ |
| if (a == &bin_attr_bos_descriptors) { |
| if (udev->bos == NULL) |
| return 0; |
| } |
| return a->attr.mode; |
| } |
| |
| static const struct attribute_group dev_bin_attr_grp = { |
| .bin_attrs = dev_bin_attrs, |
| .is_bin_visible = dev_bin_attrs_are_visible, |
| }; |
| |
| const struct attribute_group *usb_device_groups[] = { |
| &dev_attr_grp, |
| &dev_string_attr_grp, |
| &dev_bin_attr_grp, |
| NULL |
| }; |
| |
| /* |
| * Show & store the current value of authorized_default |
| */ |
| static ssize_t authorized_default_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *rh_usb_dev = to_usb_device(dev); |
| struct usb_bus *usb_bus = rh_usb_dev->bus; |
| struct usb_hcd *hcd; |
| |
| hcd = bus_to_hcd(usb_bus); |
| return sysfs_emit(buf, "%u\n", hcd->dev_policy); |
| } |
| |
| static ssize_t authorized_default_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t size) |
| { |
| ssize_t result; |
| unsigned int val; |
| struct usb_device *rh_usb_dev = to_usb_device(dev); |
| struct usb_bus *usb_bus = rh_usb_dev->bus; |
| struct usb_hcd *hcd; |
| |
| hcd = bus_to_hcd(usb_bus); |
| result = sscanf(buf, "%u\n", &val); |
| if (result == 1) { |
| hcd->dev_policy = val <= USB_DEVICE_AUTHORIZE_INTERNAL ? |
| val : USB_DEVICE_AUTHORIZE_ALL; |
| result = size; |
| } else { |
| result = -EINVAL; |
| } |
| return result; |
| } |
| static DEVICE_ATTR_RW(authorized_default); |
| |
| /* |
| * interface_authorized_default_show - show default authorization status |
| * for USB interfaces |
| * |
| * note: interface_authorized_default is the default value |
| * for initializing the authorized attribute of interfaces |
| */ |
| static ssize_t interface_authorized_default_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_device *usb_dev = to_usb_device(dev); |
| struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus); |
| |
| return sysfs_emit(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd)); |
| } |
| |
| /* |
| * interface_authorized_default_store - store default authorization status |
| * for USB interfaces |
| * |
| * note: interface_authorized_default is the default value |
| * for initializing the authorized attribute of interfaces |
| */ |
| static ssize_t interface_authorized_default_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t count) |
| { |
| struct usb_device *usb_dev = to_usb_device(dev); |
| struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus); |
| int rc = count; |
| bool val; |
| |
| if (kstrtobool(buf, &val) != 0) |
| return -EINVAL; |
| |
| if (val) |
| set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags); |
| else |
| clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags); |
| |
| return rc; |
| } |
| static DEVICE_ATTR_RW(interface_authorized_default); |
| |
| /* Group all the USB bus attributes */ |
| static struct attribute *usb_bus_attrs[] = { |
| &dev_attr_authorized_default.attr, |
| &dev_attr_interface_authorized_default.attr, |
| NULL, |
| }; |
| |
| static const struct attribute_group usb_bus_attr_group = { |
| .name = NULL, /* we want them in the same directory */ |
| .attrs = usb_bus_attrs, |
| }; |
| |
| |
| static int add_default_authorized_attributes(struct device *dev) |
| { |
| int rc = 0; |
| |
| if (is_usb_device(dev)) |
| rc = sysfs_create_group(&dev->kobj, &usb_bus_attr_group); |
| |
| return rc; |
| } |
| |
| static void remove_default_authorized_attributes(struct device *dev) |
| { |
| if (is_usb_device(dev)) { |
| sysfs_remove_group(&dev->kobj, &usb_bus_attr_group); |
| } |
| } |
| |
| int usb_create_sysfs_dev_files(struct usb_device *udev) |
| { |
| struct device *dev = &udev->dev; |
| int retval; |
| |
| retval = add_persist_attributes(dev); |
| if (retval) |
| goto error; |
| |
| retval = add_power_attributes(dev); |
| if (retval) |
| goto error; |
| |
| if (is_root_hub(udev)) { |
| retval = add_default_authorized_attributes(dev); |
| if (retval) |
| goto error; |
| } |
| return retval; |
| |
| error: |
| usb_remove_sysfs_dev_files(udev); |
| return retval; |
| } |
| |
| void usb_remove_sysfs_dev_files(struct usb_device *udev) |
| { |
| struct device *dev = &udev->dev; |
| |
| if (is_root_hub(udev)) |
| remove_default_authorized_attributes(dev); |
| |
| remove_power_attributes(dev); |
| remove_persist_attributes(dev); |
| } |
| |
| /* Interface Association Descriptor fields */ |
| #define usb_intf_assoc_attr(field, format_string) \ |
| static ssize_t \ |
| iad_##field##_show(struct device *dev, struct device_attribute *attr, \ |
| char *buf) \ |
| { \ |
| struct usb_interface *intf = to_usb_interface(dev); \ |
| \ |
| return sysfs_emit(buf, format_string, \ |
| intf->intf_assoc->field); \ |
| } \ |
| static DEVICE_ATTR_RO(iad_##field) |
| |
| usb_intf_assoc_attr(bFirstInterface, "%02x\n"); |
| usb_intf_assoc_attr(bInterfaceCount, "%02d\n"); |
| usb_intf_assoc_attr(bFunctionClass, "%02x\n"); |
| usb_intf_assoc_attr(bFunctionSubClass, "%02x\n"); |
| usb_intf_assoc_attr(bFunctionProtocol, "%02x\n"); |
| |
| /* Interface fields */ |
| #define usb_intf_attr(field, format_string) \ |
| static ssize_t \ |
| field##_show(struct device *dev, struct device_attribute *attr, \ |
| char *buf) \ |
| { \ |
| struct usb_interface *intf = to_usb_interface(dev); \ |
| \ |
| return sysfs_emit(buf, format_string, \ |
| intf->cur_altsetting->desc.field); \ |
| } \ |
| static DEVICE_ATTR_RO(field) |
| |
| usb_intf_attr(bInterfaceNumber, "%02x\n"); |
| usb_intf_attr(bAlternateSetting, "%2d\n"); |
| usb_intf_attr(bNumEndpoints, "%02x\n"); |
| usb_intf_attr(bInterfaceClass, "%02x\n"); |
| usb_intf_attr(bInterfaceSubClass, "%02x\n"); |
| usb_intf_attr(bInterfaceProtocol, "%02x\n"); |
| |
| static ssize_t interface_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_interface *intf; |
| char *string; |
| |
| intf = to_usb_interface(dev); |
| string = READ_ONCE(intf->cur_altsetting->string); |
| if (!string) |
| return 0; |
| return sysfs_emit(buf, "%s\n", string); |
| } |
| static DEVICE_ATTR_RO(interface); |
| |
| static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, |
| char *buf) |
| { |
| struct usb_interface *intf; |
| struct usb_device *udev; |
| struct usb_host_interface *alt; |
| |
| intf = to_usb_interface(dev); |
| udev = interface_to_usbdev(intf); |
| alt = READ_ONCE(intf->cur_altsetting); |
| |
| return sysfs_emit(buf, |
| "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02X" |
| "ic%02Xisc%02Xip%02Xin%02X\n", |
| le16_to_cpu(udev->descriptor.idVendor), |
| le16_to_cpu(udev->descriptor.idProduct), |
| le16_to_cpu(udev->descriptor.bcdDevice), |
| udev->descriptor.bDeviceClass, |
| udev->descriptor.bDeviceSubClass, |
| udev->descriptor.bDeviceProtocol, |
| alt->desc.bInterfaceClass, |
| alt->desc.bInterfaceSubClass, |
| alt->desc.bInterfaceProtocol, |
| alt->desc.bInterfaceNumber); |
| } |
| static DEVICE_ATTR_RO(modalias); |
| |
| static ssize_t supports_autosuspend_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| int s; |
| |
| s = device_lock_interruptible(dev); |
| if (s < 0) |
| return -EINTR; |
| /* Devices will be autosuspended even when an interface isn't claimed */ |
| s = (!dev->driver || to_usb_driver(dev->driver)->supports_autosuspend); |
| device_unlock(dev); |
| |
| return sysfs_emit(buf, "%u\n", s); |
| } |
| static DEVICE_ATTR_RO(supports_autosuspend); |
| |
| /* |
| * interface_authorized_show - show authorization status of an USB interface |
| * 1 is authorized, 0 is deauthorized |
| */ |
| static ssize_t interface_authorized_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_interface *intf = to_usb_interface(dev); |
| |
| return sysfs_emit(buf, "%u\n", intf->authorized); |
| } |
| |
| /* |
| * interface_authorized_store - authorize or deauthorize an USB interface |
| */ |
| static ssize_t interface_authorized_store(struct device *dev, |
| struct device_attribute *attr, const char *buf, size_t count) |
| { |
| struct usb_interface *intf = to_usb_interface(dev); |
| bool val; |
| struct kernfs_node *kn; |
| |
| if (kstrtobool(buf, &val) != 0) |
| return -EINVAL; |
| |
| if (val) { |
| usb_authorize_interface(intf); |
| } else { |
| /* |
| * Prevent deadlock if another process is concurrently |
| * trying to unregister intf. |
| */ |
| kn = sysfs_break_active_protection(&dev->kobj, &attr->attr); |
| if (kn) { |
| usb_deauthorize_interface(intf); |
| sysfs_unbreak_active_protection(kn); |
| } |
| } |
| |
| return count; |
| } |
| static struct device_attribute dev_attr_interface_authorized = |
| __ATTR(authorized, S_IRUGO | S_IWUSR, |
| interface_authorized_show, interface_authorized_store); |
| |
| static struct attribute *intf_attrs[] = { |
| &dev_attr_bInterfaceNumber.attr, |
| &dev_attr_bAlternateSetting.attr, |
| &dev_attr_bNumEndpoints.attr, |
| &dev_attr_bInterfaceClass.attr, |
| &dev_attr_bInterfaceSubClass.attr, |
| &dev_attr_bInterfaceProtocol.attr, |
| &dev_attr_modalias.attr, |
| &dev_attr_supports_autosuspend.attr, |
| &dev_attr_interface_authorized.attr, |
| NULL, |
| }; |
| static const struct attribute_group intf_attr_grp = { |
| .attrs = intf_attrs, |
| }; |
| |
| static struct attribute *intf_assoc_attrs[] = { |
| &dev_attr_iad_bFirstInterface.attr, |
| &dev_attr_iad_bInterfaceCount.attr, |
| &dev_attr_iad_bFunctionClass.attr, |
| &dev_attr_iad_bFunctionSubClass.attr, |
| &dev_attr_iad_bFunctionProtocol.attr, |
| NULL, |
| }; |
| |
| static umode_t intf_assoc_attrs_are_visible(struct kobject *kobj, |
| struct attribute *a, int n) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct usb_interface *intf = to_usb_interface(dev); |
| |
| if (intf->intf_assoc == NULL) |
| return 0; |
| return a->mode; |
| } |
| |
| static const struct attribute_group intf_assoc_attr_grp = { |
| .attrs = intf_assoc_attrs, |
| .is_visible = intf_assoc_attrs_are_visible, |
| }; |
| |
| static ssize_t wireless_status_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct usb_interface *intf; |
| |
| intf = to_usb_interface(dev); |
| if (intf->wireless_status == USB_WIRELESS_STATUS_DISCONNECTED) |
| return sysfs_emit(buf, "%s\n", "disconnected"); |
| return sysfs_emit(buf, "%s\n", "connected"); |
| } |
| static DEVICE_ATTR_RO(wireless_status); |
| |
| static struct attribute *intf_wireless_status_attrs[] = { |
| &dev_attr_wireless_status.attr, |
| NULL |
| }; |
| |
| static umode_t intf_wireless_status_attr_is_visible(struct kobject *kobj, |
| struct attribute *a, int n) |
| { |
| struct device *dev = kobj_to_dev(kobj); |
| struct usb_interface *intf = to_usb_interface(dev); |
| |
| if (a != &dev_attr_wireless_status.attr || |
| intf->wireless_status != USB_WIRELESS_STATUS_NA) |
| return a->mode; |
| return 0; |
| } |
| |
| static const struct attribute_group intf_wireless_status_attr_grp = { |
| .attrs = intf_wireless_status_attrs, |
| .is_visible = intf_wireless_status_attr_is_visible, |
| }; |
| |
| int usb_update_wireless_status_attr(struct usb_interface *intf) |
| { |
| struct device *dev = &intf->dev; |
| int ret; |
| |
| ret = sysfs_update_group(&dev->kobj, &intf_wireless_status_attr_grp); |
| if (ret < 0) |
| return ret; |
| |
| sysfs_notify(&dev->kobj, NULL, "wireless_status"); |
| kobject_uevent(&dev->kobj, KOBJ_CHANGE); |
| |
| return 0; |
| } |
| |
| const struct attribute_group *usb_interface_groups[] = { |
| &intf_attr_grp, |
| &intf_assoc_attr_grp, |
| &intf_wireless_status_attr_grp, |
| NULL |
| }; |
| |
| void usb_create_sysfs_intf_files(struct usb_interface *intf) |
| { |
| struct usb_device *udev = interface_to_usbdev(intf); |
| struct usb_host_interface *alt = intf->cur_altsetting; |
| |
| if (intf->sysfs_files_created || intf->unregistering) |
| return; |
| |
| if (!alt->string && !(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS)) |
| alt->string = usb_cache_string(udev, alt->desc.iInterface); |
| if (alt->string && device_create_file(&intf->dev, &dev_attr_interface)) { |
| /* This is not a serious error */ |
| dev_dbg(&intf->dev, "interface string descriptor file not created\n"); |
| } |
| intf->sysfs_files_created = 1; |
| } |
| |
| void usb_remove_sysfs_intf_files(struct usb_interface *intf) |
| { |
| if (!intf->sysfs_files_created) |
| return; |
| |
| device_remove_file(&intf->dev, &dev_attr_interface); |
| intf->sysfs_files_created = 0; |
| } |