Initial import

1 files changed, 997 insertions, 0 deletions

diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
new file mode 100644
index 000000000..d26973844
--- /dev/null
+++ b/drivers/usb/core/sysfs.c
@@ -0,0 +1,997 @@
+/*
+ * 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 field##_show(struct device *dev,				\
+			    struct device_attribute *attr, char *buf)	\
+{									\
+	struct usb_device *udev;					\
+	struct usb_host_config *actconfig;				\
+	ssize_t rc = 0;							\
+									\
+	udev = to_usb_device(dev);					\
+	usb_lock_device(udev);						\
+	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 = 0;
+
+	udev = to_usb_device(dev);
+	usb_lock_device(udev);
+	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 = 0;
+
+	udev = to_usb_device(dev);
+	usb_lock_device(udev);
+	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;
+
+	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,
+		bConfigurationValue_show, bConfigurationValue_store);
+
+/* 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);					\
+	usb_lock_device(udev);						\
+	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;
+	default:
+		speed = "unknown";
+	}
+	return sprintf(buf, "%s\n", speed);
+}
+static DEVICE_ATTR_RO(speed);
+
+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;
+
+	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_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 removable_show(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_RO(removable);
+
+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;
+
+	/* 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_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;
+
+	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_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;
+
+	usb_lock_device(udev);
+
+	ret = strtobool(buf, &value);
+
+	if (!ret) {
+		udev->usb2_hw_lpm_allowed = value;
+		ret = usb_set_usb2_hardware_lpm(udev, value);
+	}
+
+	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 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_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_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).
+	 */
+	usb_lock_device(udev);
+	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;
+		}
+	}
+	usb_unlock_device(udev);
+	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 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 = ACCESS_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 = ACCESS_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;
+
+	device_lock(dev);
+	/* 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);
+
+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;
+}