drivers/usb/core/sysfs.c - linux - Git at Google

 /*
  * 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/usb.h>
 #include "usb.h"

 /* Active configuration fields */
 #define usb_actconfig_show(field, multiplier, 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 * multiplier);	\
 	else								\
 		return 0;						\
 }									\

 #define usb_actconfig_attr(field, multiplier, format_string)		\
 usb_actconfig_show(field, multiplier, format_string)			\
 static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);

 usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
 usb_actconfig_attr(bmAttributes, 1, "%2x\n")
 usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")

 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, 1, "%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(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;					\
 									\
 	udev = to_usb_device(dev);					\
 	return sprintf(buf, "%s\n", udev->name);			\
 }									\
 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;
 	default:
 		speed = "unknown";
 	}
 	return sprintf(buf, "%s\n", speed);
 }
 static DEVICE_ATTR(speed, S_IRUGO, show_speed, 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_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);

 #ifdef	CONFIG_USB_SUSPEND

 static ssize_t
 show_autosuspend(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct usb_device *udev = to_usb_device(dev);

 	return sprintf(buf, "%u\n", udev->autosuspend_delay / HZ);
 }

 static ssize_t
 set_autosuspend(struct device *dev, struct device_attribute *attr,
 		const char *buf, size_t count)
 {
 	struct usb_device *udev = to_usb_device(dev);
 	unsigned value, old;

 	if (sscanf(buf, "%u", &value) != 1 || value >= INT_MAX/HZ)
 		return -EINVAL;
 	value *= HZ;

 	old = udev->autosuspend_delay;
 	udev->autosuspend_delay = value;
 	if (value > 0 && old == 0)
 		usb_try_autosuspend_device(udev);

 	return count;
 }

 static DEVICE_ATTR(autosuspend, S_IRUGO | S_IWUSR,
 		show_autosuspend, set_autosuspend);

 static char power_group[] = "power";

 static int add_power_attributes(struct device *dev)
 {
 	int rc = 0;

 	if (is_usb_device(dev))
 		rc = sysfs_add_file_to_group(&dev->kobj,
 				&dev_attr_autosuspend.attr,
 				power_group);
 	return rc;
 }

 static void remove_power_attributes(struct device *dev)
 {
 	sysfs_remove_file_from_group(&dev->kobj,
 			&dev_attr_autosuspend.attr,
 			power_group);
 }

 #else

 #define add_power_attributes(dev)	0
 #define remove_power_attributes(dev)	do {} while (0)

 #endif	/* CONFIG_USB_SUSPEND */

 /* 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")

 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_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_devnum.attr,
 	&dev_attr_version.attr,
 	&dev_attr_maxchild.attr,
 	&dev_attr_quirks.attr,
 	NULL,
 };
 static struct attribute_group dev_attr_grp = {
 	.attrs = dev_attrs,
 };

 int usb_create_sysfs_dev_files(struct usb_device *udev)
 {
 	struct device *dev = &udev->dev;
 	int retval;

 	retval = sysfs_create_group(&dev->kobj, &dev_attr_grp);
 	if (retval)
 		return retval;

 	retval = add_power_attributes(dev);
 	if (retval)
 		goto error;

 	if (udev->manufacturer) {
 		retval = device_create_file(dev, &dev_attr_manufacturer);
 		if (retval)
 			goto error;
 	}
 	if (udev->product) {
 		retval = device_create_file(dev, &dev_attr_product);
 		if (retval)
 			goto error;
 	}
 	if (udev->serial) {
 		retval = device_create_file(dev, &dev_attr_serial);
 		if (retval)
 			goto error;
 	}
 	retval = usb_create_ep_files(dev, &udev->ep0, udev);
 	if (retval)
 		goto error;
 	return 0;
 error:
 	usb_remove_sysfs_dev_files(udev);
 	return retval;
 }

 void usb_remove_sysfs_dev_files(struct usb_device *udev)
 {
 	struct device *dev = &udev->dev;

 	usb_remove_ep_files(&udev->ep0);
 	device_remove_file(dev, &dev_attr_manufacturer);
 	device_remove_file(dev, &dev_attr_product);
 	device_remove_file(dev, &dev_attr_serial);
 	remove_power_attributes(dev);
 	sysfs_remove_group(&dev->kobj, &dev_attr_grp);
 }

 /* 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;
 	struct usb_device *udev;
 	int len;

 	intf = to_usb_interface(dev);
 	udev = interface_to_usbdev(intf);
 	len = snprintf(buf, 256, "%s", intf->cur_altsetting->string);
 	if (len < 0)
 		return 0;
 	buf[len] = '\n';
 	buf[len+1] = 0;
 	return len+1;
 }
 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%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);
 }
 static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, 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,
 	NULL,
 };
 static struct attribute_group intf_attr_grp = {
 	.attrs = intf_attrs,
 };

 static inline void usb_create_intf_ep_files(struct usb_interface *intf,
 		struct usb_device *udev)
 {
 	struct usb_host_interface *iface_desc;
 	int i;

 	iface_desc = intf->cur_altsetting;
 	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
 		usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i],
 				udev);
 }

 static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
 {
 	struct usb_host_interface *iface_desc;
 	int i;

 	iface_desc = intf->cur_altsetting;
 	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
 		usb_remove_ep_files(&iface_desc->endpoint[i]);
 }

 int usb_create_sysfs_intf_files(struct usb_interface *intf)
 {
 	struct device *dev = &intf->dev;
 	struct usb_device *udev = interface_to_usbdev(intf);
 	struct usb_host_interface *alt = intf->cur_altsetting;
 	int retval;

 	retval = sysfs_create_group(&dev->kobj, &intf_attr_grp);
 	if (retval)
 		return retval;

 	if (alt->string == NULL)
 		alt->string = usb_cache_string(udev, alt->desc.iInterface);
 	if (alt->string)
 		retval = device_create_file(dev, &dev_attr_interface);
 	usb_create_intf_ep_files(intf, udev);
 	return 0;
 }

 void usb_remove_sysfs_intf_files(struct usb_interface *intf)
 {
 	struct device *dev = &intf->dev;

 	usb_remove_intf_ep_files(intf);
 	device_remove_file(dev, &dev_attr_interface);
 	sysfs_remove_group(&dev->kobj, &intf_attr_grp);
 }
	/*
	* 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/usb.h>
	#include "usb.h"

	/* Active configuration fields */
	#define usb_actconfig_show(field, multiplier, 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 * multiplier); \
	else \
	return 0; \
	} \

	#define usb_actconfig_attr(field, multiplier, format_string) \
	usb_actconfig_show(field, multiplier, format_string) \
	static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL);

	usb_actconfig_attr(bNumInterfaces, 1, "%2d\n")
	usb_actconfig_attr(bmAttributes, 1, "%2x\n")
	usb_actconfig_attr(bMaxPower, 2, "%3dmA\n")

	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, 1, "%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(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; \
	\
	udev = to_usb_device(dev); \
	return sprintf(buf, "%s\n", udev->name); \
	} \
	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;
	default:
	speed = "unknown";
	}
	return sprintf(buf, "%s\n", speed);
	}
	static DEVICE_ATTR(speed, S_IRUGO, show_speed, 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_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);

	#ifdef CONFIG_USB_SUSPEND

	static ssize_t
	show_autosuspend(struct device dev, struct device_attribute attr, char *buf)
	{
	struct usb_device *udev = to_usb_device(dev);

	return sprintf(buf, "%u\n", udev->autosuspend_delay / HZ);
	}

	static ssize_t
	set_autosuspend(struct device dev, struct device_attribute attr,
	const char *buf, size_t count)
	{
	struct usb_device *udev = to_usb_device(dev);
	unsigned value, old;

	if (sscanf(buf, "%u", &value) != 1 \|\| value >= INT_MAX/HZ)
	return -EINVAL;
	value *= HZ;

	old = udev->autosuspend_delay;
	udev->autosuspend_delay = value;
	if (value > 0 && old == 0)
	usb_try_autosuspend_device(udev);

	return count;
	}

	static DEVICE_ATTR(autosuspend, S_IRUGO \| S_IWUSR,
	show_autosuspend, set_autosuspend);

	static char power_group[] = "power";

	static int add_power_attributes(struct device *dev)
	{
	int rc = 0;

	if (is_usb_device(dev))
	rc = sysfs_add_file_to_group(&dev->kobj,
	&dev_attr_autosuspend.attr,
	power_group);
	return rc;
	}

	static void remove_power_attributes(struct device *dev)
	{
	sysfs_remove_file_from_group(&dev->kobj,
	&dev_attr_autosuspend.attr,
	power_group);
	}

	#else

	#define add_power_attributes(dev) 0
	#define remove_power_attributes(dev) do {} while (0)

	#endif /* CONFIG_USB_SUSPEND */

	/* 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")

	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_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_devnum.attr,
	&dev_attr_version.attr,
	&dev_attr_maxchild.attr,
	&dev_attr_quirks.attr,
	NULL,
	};
	static struct attribute_group dev_attr_grp = {
	.attrs = dev_attrs,
	};

	int usb_create_sysfs_dev_files(struct usb_device *udev)
	{
	struct device *dev = &udev->dev;
	int retval;

	retval = sysfs_create_group(&dev->kobj, &dev_attr_grp);
	if (retval)
	return retval;

	retval = add_power_attributes(dev);
	if (retval)
	goto error;

	if (udev->manufacturer) {
	retval = device_create_file(dev, &dev_attr_manufacturer);
	if (retval)
	goto error;
	}
	if (udev->product) {
	retval = device_create_file(dev, &dev_attr_product);
	if (retval)
	goto error;
	}
	if (udev->serial) {
	retval = device_create_file(dev, &dev_attr_serial);
	if (retval)
	goto error;
	}
	retval = usb_create_ep_files(dev, &udev->ep0, udev);
	if (retval)
	goto error;
	return 0;
	error:
	usb_remove_sysfs_dev_files(udev);
	return retval;
	}

	void usb_remove_sysfs_dev_files(struct usb_device *udev)
	{
	struct device *dev = &udev->dev;

	usb_remove_ep_files(&udev->ep0);
	device_remove_file(dev, &dev_attr_manufacturer);
	device_remove_file(dev, &dev_attr_product);
	device_remove_file(dev, &dev_attr_serial);
	remove_power_attributes(dev);
	sysfs_remove_group(&dev->kobj, &dev_attr_grp);
	}

	/* 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;
	struct usb_device *udev;
	int len;

	intf = to_usb_interface(dev);
	udev = interface_to_usbdev(intf);
	len = snprintf(buf, 256, "%s", intf->cur_altsetting->string);
	if (len < 0)
	return 0;
	buf[len] = '\n';
	buf[len+1] = 0;
	return len+1;
	}
	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%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);
	}
	static DEVICE_ATTR(modalias, S_IRUGO, show_modalias, 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,
	NULL,
	};
	static struct attribute_group intf_attr_grp = {
	.attrs = intf_attrs,
	};

	static inline void usb_create_intf_ep_files(struct usb_interface *intf,
	struct usb_device *udev)
	{
	struct usb_host_interface *iface_desc;
	int i;

	iface_desc = intf->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
	usb_create_ep_files(&intf->dev, &iface_desc->endpoint[i],
	udev);
	}

	static inline void usb_remove_intf_ep_files(struct usb_interface *intf)
	{
	struct usb_host_interface *iface_desc;
	int i;

	iface_desc = intf->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
	usb_remove_ep_files(&iface_desc->endpoint[i]);
	}

	int usb_create_sysfs_intf_files(struct usb_interface *intf)
	{
	struct device *dev = &intf->dev;
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_host_interface *alt = intf->cur_altsetting;
	int retval;

	retval = sysfs_create_group(&dev->kobj, &intf_attr_grp);
	if (retval)
	return retval;

	if (alt->string == NULL)
	alt->string = usb_cache_string(udev, alt->desc.iInterface);
	if (alt->string)
	retval = device_create_file(dev, &dev_attr_interface);
	usb_create_intf_ep_files(intf, udev);
	return 0;
	}

	void usb_remove_sysfs_intf_files(struct usb_interface *intf)
	{
	struct device *dev = &intf->dev;

	usb_remove_intf_ep_files(intf);
	device_remove_file(dev, &dev_attr_interface);
	sysfs_remove_group(&dev->kobj, &intf_attr_grp);
	}