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- /*
- * 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.
- *
- */
- #include <linux/kernel.h>
- #include <linux/string.h>
- #include <linux/usb.h>
- #include <linux/usb/quirks.h>
- #include "usb.h"
- /* Active configuration fields */
- #define usb_actconfig_show(field, format_string) \
- static ssize_t show_##field(struct device *dev, \
- struct device_attribute *attr, char *buf) \
- { \
- struct usb_device *udev; \
- struct usb_host_config *actconfig; \
- \
- udev = to_usb_device(dev); \
- actconfig = udev->actconfig; \
- if (actconfig) \
- return sprintf(buf, format_string, \
- actconfig->desc.field); \
- else \
- return 0; \
- } \
- #define usb_actconfig_attr(field, format_string) \
- usb_actconfig_show(field, format_string) \
- static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);
- usb_actconfig_attr(bNumInterfaces, "%2d\n")
- usb_actconfig_attr(bmAttributes, "%2x\n")
- static ssize_t show_bMaxPower(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct usb_device *udev;
- struct usb_host_config *actconfig;
- udev = to_usb_device(dev);
- actconfig = udev->actconfig;
- if (!actconfig)
- return 0;
- return sprintf(buf, "%dmA\n", usb_get_max_power(udev, actconfig));
- }
- static DEVICE_ATTR(bMaxPower, S_IRUGO, show_bMaxPower, NULL);
- static ssize_t show_configuration_string(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct usb_device *udev;
- struct usb_host_config *actconfig;
- udev = to_usb_device(dev);
- actconfig = udev->actconfig;
- if ((!actconfig) || (!actconfig->string))
- return 0;
- return sprintf(buf, "%s\n", actconfig->string);
- }
- static DEVICE_ATTR(configuration, S_IRUGO, show_configuration_string, NULL);
- /* configuration value is always present, and r/w */
- usb_actconfig_show(bConfigurationValue, "%u\n");
- static ssize_t
- set_bConfigurationValue(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct usb_device *udev = to_usb_device(dev);
- int config, value;
- if (sscanf(buf, "%d", &config) != 1 || config < -1 || config > 255)
- return -EINVAL;
- usb_lock_device(udev);
- 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,
- show_bConfigurationValue, set_bConfigurationValue);
- /* String fields */
- #define usb_string_attr(name) \
- static ssize_t show_##name(struct device *dev, \
- struct device_attribute *attr, char *buf) \
- { \
- struct usb_device *udev; \
- int retval; \
- \
- udev = to_usb_device(dev); \
- usb_lock_device(udev); \
- retval = sprintf(buf, "%s\n", udev->name); \
- usb_unlock_device(udev); \
- return retval; \
- } \
- static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL);
- usb_string_attr(product);
- usb_string_attr(manufacturer);
- usb_string_attr(serial);
- static ssize_t
- show_speed(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;
- default:
- speed = "unknown";
- }
- return sprintf(buf, "%s\n", speed);
- }
- static DEVICE_ATTR(speed, S_IRUGO, show_speed, NULL);
- static ssize_t
- show_busnum(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(busnum, S_IRUGO, show_busnum, NULL);
- static ssize_t
- show_devnum(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(devnum, S_IRUGO, show_devnum, NULL);
- static ssize_t
- show_devpath(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(devpath, S_IRUGO, show_devpath, NULL);
- static ssize_t
- show_version(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(version, S_IRUGO, show_version, NULL);
- static ssize_t
- show_maxchild(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(maxchild, S_IRUGO, show_maxchild, NULL);
- static ssize_t
- show_quirks(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(quirks, S_IRUGO, show_quirks, NULL);
- static ssize_t
- show_avoid_reset_quirk(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
- set_avoid_reset_quirk(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct usb_device *udev = to_usb_device(dev);
- int val;
- if (sscanf(buf, "%d", &val) != 1 || val < 0 || val > 1)
- return -EINVAL;
- usb_lock_device(udev);
- if (val)
- udev->quirks |= USB_QUIRK_RESET;
- else
- udev->quirks &= ~USB_QUIRK_RESET;
- usb_unlock_device(udev);
- return count;
- }
- static DEVICE_ATTR(avoid_reset_quirk, S_IRUGO | S_IWUSR,
- show_avoid_reset_quirk, set_avoid_reset_quirk);
- static ssize_t
- show_urbnum(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(urbnum, S_IRUGO, show_urbnum, NULL);
- static ssize_t
- show_removable(struct device *dev, struct device_attribute *attr, char *buf)
- {
- struct usb_device *udev;
- char *state;
- udev = to_usb_device(dev);
- switch (udev->removable) {
- case USB_DEVICE_REMOVABLE:
- state = "removable";
- break;
- case USB_DEVICE_FIXED:
- state = "fixed";
- break;
- default:
- state = "unknown";
- }
- return sprintf(buf, "%s\n", state);
- }
- static DEVICE_ATTR(removable, S_IRUGO, show_removable, NULL);
- static ssize_t
- show_ltm_capable(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(ltm_capable, S_IRUGO, show_ltm_capable, NULL);
- #ifdef CONFIG_PM
- static ssize_t
- show_persist(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
- set_persist(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct usb_device *udev = to_usb_device(dev);
- int value;
- /* Hubs are always enabled for USB_PERSIST */
- if (udev->descriptor.bDeviceClass == USB_CLASS_HUB)
- return -EPERM;
- if (sscanf(buf, "%d", &value) != 1)
- return -EINVAL;
- usb_lock_device(udev);
- udev->persist_enabled = !!value;
- usb_unlock_device(udev);
- return count;
- }
- static DEVICE_ATTR(persist, S_IRUGO | S_IWUSR, show_persist, set_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);
- }
- #else
- #define add_persist_attributes(dev) 0
- #define remove_persist_attributes(dev) do {} while (0)
- #endif /* CONFIG_PM */
- #ifdef CONFIG_PM_RUNTIME
- static ssize_t
- show_connected_duration(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(connected_duration, S_IRUGO, show_connected_duration, NULL);
- /*
- * 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
- show_active_duration(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(active_duration, S_IRUGO, show_active_duration, NULL);
- static ssize_t
- show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
- {
- return sprintf(buf, "%d\n", dev->power.autosuspend_delay / 1000);
- }
- static ssize_t
- set_autosuspend(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(autosuspend, S_IRUGO | S_IWUSR,
- show_autosuspend, set_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
- show_level(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
- set_level(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;
- warn_level();
- cp = memchr(buf, '\n', count);
- if (cp)
- len = cp - buf;
- usb_lock_device(udev);
- 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(level, S_IRUGO | S_IWUSR, show_level, set_level);
- static ssize_t
- show_usb2_hardware_lpm(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_enabled == 1)
- p = "enabled";
- else
- p = "disabled";
- return sprintf(buf, "%s\n", p);
- }
- static ssize_t
- set_usb2_hardware_lpm(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;
- usb_lock_device(udev);
- ret = strtobool(buf, &value);
- if (!ret)
- ret = usb_set_usb2_hardware_lpm(udev, value);
- usb_unlock_device(udev);
- if (!ret)
- return count;
- return ret;
- }
- static DEVICE_ATTR(usb2_hardware_lpm, S_IRUGO | S_IWUSR, show_usb2_hardware_lpm,
- set_usb2_hardware_lpm);
- static ssize_t
- show_usb2_lpm_l1_timeout(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
- set_usb2_lpm_l1_timeout(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(usb2_lpm_l1_timeout, S_IRUGO | S_IWUSR,
- show_usb2_lpm_l1_timeout, set_usb2_lpm_l1_timeout);
- static ssize_t
- show_usb2_lpm_besl(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
- set_usb2_lpm_besl(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(usb2_lpm_besl, S_IRUGO | S_IWUSR,
- show_usb2_lpm_besl, set_usb2_lpm_besl);
- 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 *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);
- }
- 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_power_attributes(dev) 0
- #define remove_power_attributes(dev) do {} while (0)
- #endif /* CONFIG_PM_RUNTIME */
- /* Descriptor fields */
- #define usb_descriptor_attr_le16(field, format_string) \
- static ssize_t \
- show_##field(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(field, S_IRUGO, show_##field, NULL);
- 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 \
- show_##field(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(field, S_IRUGO, show_##field, NULL);
- 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 usb_dev_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 usb_dev_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, 0644,
- usb_dev_authorized_show, usb_dev_authorized_store);
- /* "Safely remove a device" */
- static ssize_t usb_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, 0200, NULL, usb_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_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_removable.attr,
- &dev_attr_ltm_capable.attr,
- 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 = container_of(kobj, struct device, 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 = container_of(kobj, struct device, 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 */
- };
- 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;
- 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;
- remove_power_attributes(dev);
- remove_persist_attributes(dev);
- device_remove_bin_file(dev, &dev_bin_attr_descriptors);
- }
- /* Interface Accociation Descriptor fields */
- #define usb_intf_assoc_attr(field, format_string) \
- static ssize_t \
- show_iad_##field(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(iad_##field, S_IRUGO, show_iad_##field, NULL);
- 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 \
- show_##field(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(field, S_IRUGO, show_##field, NULL);
- 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 show_interface_string(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct usb_interface *intf;
- char *string;
- intf = to_usb_interface(dev);
- string = intf->cur_altsetting->string;
- barrier(); /* The altsetting might change! */
- if (!string)
- return 0;
- return sprintf(buf, "%s\n", string);
- }
- static DEVICE_ATTR(interface, S_IRUGO, show_interface_string, NULL);
- static ssize_t show_modalias(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 = 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(modalias, S_IRUGO, show_modalias, NULL);
- static ssize_t show_supports_autosuspend(struct device *dev,
- struct device_attribute *attr, char *buf)
- {
- struct usb_interface *intf;
- struct usb_device *udev;
- int ret;
- intf = to_usb_interface(dev);
- udev = interface_to_usbdev(intf);
- usb_lock_device(udev);
- /* Devices will be autosuspended even when an interface isn't claimed */
- if (!intf->dev.driver ||
- to_usb_driver(intf->dev.driver)->supports_autosuspend)
- ret = sprintf(buf, "%u\n", 1);
- else
- ret = sprintf(buf, "%u\n", 0);
- usb_unlock_device(udev);
- return ret;
- }
- static DEVICE_ATTR(supports_autosuspend, S_IRUGO, show_supports_autosuspend, NULL);
- 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,
- 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 = container_of(kobj, struct device, 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))
- ; /* We don't actually care if the function fails. */
- 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;
- }
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