diff options
Diffstat (limited to 'drivers/usb/core/sysfs.c')
| -rw-r--r-- | drivers/usb/core/sysfs.c | 1255 |
1 files changed, 1255 insertions, 0 deletions
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c new file mode 100644 index 000000000..35ce8b87e --- /dev/null +++ b/drivers/usb/core/sysfs.c @@ -0,0 +1,1255 @@ +// 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/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 = sprintf(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 = sprintf(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 = sprintf(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 sprintf(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 = sprintf(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_WIRELESS: + speed = "480"; + break; + case USB_SPEED_SUPER: + speed = "5000"; + break; + case USB_SPEED_SUPER_PLUS: + speed = "10000"; + break; + default: + speed = "unknown"; + } + return sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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); + int val, rc; + + if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1) + 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 sprintf(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 sprintf(buf, "%s\n", "yes"); + return sprintf(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 sprintf(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); + int value, rc; + + /* Hubs are always enabled for USB_PERSIST */ + if (udev->descriptor.bDeviceClass == USB_CLASS_HUB) + return -EPERM; + + if (sscanf(buf, "%d", &value) != 1) + 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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 = strtobool(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 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 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 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, &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 sprintf(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 sprintf(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 snprintf(buf, PAGE_SIZE, "%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); + unsigned val; + result = sscanf(buf, "%u\n", &val); + if (result != 1) + result = -EINVAL; + else if (val == 0) + result = usb_deauthorize_device(usb_dev); + else + result = usb_authorize_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 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 struct attribute_group dev_string_attr_grp = { + .attrs = dev_string_attrs, + .is_visible = dev_string_attrs_are_visible, +}; + +const struct attribute_group *usb_device_groups[] = { + &dev_attr_grp, + &dev_string_attr_grp, + NULL +}; + +/* Binary descriptors */ + +static ssize_t +read_descriptors(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 struct bin_attribute dev_bin_attr_descriptors = { + .attr = {.name = "descriptors", .mode = 0444}, + .read = read_descriptors, + .size = 18 + 65535, /* dev descr + max-size raw descriptor */ +}; + +/* + * 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 snprintf(buf, PAGE_SIZE, "%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 sprintf(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 (strtobool(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 = device_create_bin_file(dev, &dev_bin_attr_descriptors); + if (retval) + goto error; + + 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); + device_remove_bin_file(dev, &dev_bin_attr_descriptors); +} + +/* 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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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 sprintf(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; + + if (strtobool(buf, &val) != 0) + return -EINVAL; + + if (val) + usb_authorize_interface(intf); + else + usb_deauthorize_interface(intf); + + 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 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 struct attribute_group intf_assoc_attr_grp = { + .attrs = intf_assoc_attrs, + .is_visible = intf_assoc_attrs_are_visible, +}; + +const struct attribute_group *usb_interface_groups[] = { + &intf_attr_grp, + &intf_assoc_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; +} |