path: root/drivers/usb/core/sysfs.c

/*
 * 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