linux/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/config.h>
#include <linux/kernel.h>

#ifdef CONFIG_USB_DEBUG
	#define DEBUG
#else
	#undef DEBUG
#endif
#include <linux/usb.h>

#include "usb.h"

/* endpoint stuff */
struct endpoint_attribute {
	struct device_attribute dev_attr;
	struct usb_endpoint_descriptor *endpoint;
	struct usb_device *udev;
};
#define to_endpoint_attr(_dev_attr) \
	container_of(_dev_attr, struct endpoint_attribute, dev_attr)

#define usb_ep_attr(field, format_string)					\
static ssize_t show_ep_##field(struct device *dev, struct device_attribute *attr,	\
			    char *buf)						\
{										\
	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);	\
										\
	return sprintf(buf, format_string, endpoint_attr->endpoint->field);	\
}
usb_ep_attr(bLength, "%02x\n")
usb_ep_attr(bDescriptorType, "%02x\n")
usb_ep_attr(bEndpointAddress, "%02x\n")
usb_ep_attr(bmAttributes, "%02x\n")
usb_ep_attr(bInterval, "%02x\n")

static ssize_t show_ep_wMaxPacketSize(struct device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);

	return sprintf(buf, "%04x\n",
		      le16_to_cpu(endpoint_attr->endpoint->wMaxPacketSize) & 0x07ff);
}

static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);
	char *type = "unknown";

	switch (endpoint_attr->endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
	case USB_ENDPOINT_XFER_CONTROL:
		type = "Control";
		break;
	case USB_ENDPOINT_XFER_ISOC:
		type = "Isoc";
		break;
	case USB_ENDPOINT_XFER_BULK:
		type = "Bulk";
		break;
	case USB_ENDPOINT_XFER_INT:
		type = "Interrupt";
		break;
	}
	return sprintf(buf, "%s\n", type);
}

static ssize_t show_ep_interval(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);
	struct usb_device *udev = endpoint_attr->udev;
	struct usb_endpoint_descriptor *endpoint = endpoint_attr->endpoint;
	char unit;
	unsigned interval = 0;
	unsigned in;

	in = (endpoint->bEndpointAddress & USB_DIR_IN);

	switch (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
	case USB_ENDPOINT_XFER_CONTROL:
		if (udev->speed == USB_SPEED_HIGH) 	/* uframes per NAK */
			interval = endpoint->bInterval;
		break;
	case USB_ENDPOINT_XFER_ISOC:
		interval = 1 << (endpoint->bInterval - 1);
		break;
	case USB_ENDPOINT_XFER_BULK:
		if (udev->speed == USB_SPEED_HIGH && !in)	/* uframes per NAK */
			interval = endpoint->bInterval;
		break;
	case USB_ENDPOINT_XFER_INT:
		if (udev->speed == USB_SPEED_HIGH) {
			interval = 1 << (endpoint->bInterval - 1);
		} else
			interval = endpoint->bInterval;
		break;
	}
	interval *= (udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
	if (interval % 1000)
		unit = 'u';
	else {
		unit = 'm';
		interval /= 1000;
	}

	return sprintf(buf, "%d%cs\n", interval, unit);
}

static ssize_t show_ep_direction(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);
	char *direction;

	if ((endpoint_attr->endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
	    USB_ENDPOINT_XFER_CONTROL)
		direction = "both";
	else if (endpoint_attr->endpoint->bEndpointAddress & USB_DIR_IN)
		direction = "in";
	else
		direction = "out";
	return sprintf(buf, "%s\n", direction);
}

static struct endpoint_attribute *create_ep_attr(struct usb_endpoint_descriptor *endpoint,
						 struct usb_device *udev, char *name,
		ssize_t (*show)(struct device *dev, struct device_attribute *attr, char *buf))
{
	struct endpoint_attribute *ep_attr;

	ep_attr = kzalloc(sizeof(*ep_attr), GFP_KERNEL);
	if (ep_attr) {
		ep_attr->endpoint = endpoint;
		ep_attr->udev = udev;
		ep_attr->dev_attr.attr.name = name;
		ep_attr->dev_attr.attr.mode = 0444;
		ep_attr->dev_attr.attr.owner = THIS_MODULE;
		ep_attr->dev_attr.show = show;
	}
	return ep_attr;
}

static void usb_create_ep_files(struct kobject *kobj, struct usb_host_endpoint *endpoint, struct usb_device *udev)
{
	struct usb_endpoint_descriptor *ep;

	ep = &endpoint->desc;

	endpoint->attrs = kzalloc(sizeof(struct attribute *) * 10, GFP_KERNEL);
	endpoint->attrs[0] = &(create_ep_attr(ep, udev, "direction", show_ep_direction)->dev_attr.attr);
	endpoint->attrs[1] = &(create_ep_attr(ep, udev, "type", show_ep_type)->dev_attr.attr);
	endpoint->attrs[2] = &(create_ep_attr(ep, udev, "bLength", show_ep_bLength)->dev_attr.attr);
	endpoint->attrs[3] = &(create_ep_attr(ep, udev, "bDescriptorType", show_ep_bDescriptorType)->dev_attr.attr);
	endpoint->attrs[4] = &(create_ep_attr(ep, udev, "bEndpointAddress", show_ep_bEndpointAddress)->dev_attr.attr);
	endpoint->attrs[5] = &(create_ep_attr(ep, udev, "bmAttributes", show_ep_bmAttributes)->dev_attr.attr);
	endpoint->attrs[6] = &(create_ep_attr(ep, udev, "wMaxPacketSize", show_ep_wMaxPacketSize)->dev_attr.attr);
	endpoint->attrs[7] = &(create_ep_attr(ep, udev, "bInterval", show_ep_bInterval)->dev_attr.attr);
	endpoint->attrs[8] = &(create_ep_attr(ep, udev, "interval", show_ep_interval)->dev_attr.attr);
	endpoint->attrs[9] = NULL;
	endpoint->num_attrs = 9;

	endpoint->attr_group = kzalloc(sizeof(*endpoint->attr_group), GFP_KERNEL);
	endpoint->attr_name = kzalloc(10, GFP_KERNEL);
	sprintf(endpoint->attr_name, "ep_%02x", endpoint->desc.bEndpointAddress);

	endpoint->attr_group->attrs = endpoint->attrs;
	endpoint->attr_group->name = endpoint->attr_name;
	sysfs_create_group(kobj, endpoint->attr_group);
}

static void usb_remove_ep_files(struct kobject *kobj, struct usb_host_endpoint *endpoint)
{
	int i;

	sysfs_remove_group(kobj, endpoint->attr_group);
	kfree(endpoint->attr_group);
	kfree(endpoint->attr_name);
	for (i = 0; i < endpoint->num_attrs; ++i)
		kfree(endpoint->attrs[i]);
	kfree(endpoint->attrs);
}

/* 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;
	int len;

	udev = to_usb_device (dev);
	actconfig = udev->actconfig;
	if ((!actconfig) || (!actconfig->string))
		return 0;
	len = sprintf(buf, actconfig->string, PAGE_SIZE);
	if (len < 0)
		return 0;
	buf[len] = '\n';
	buf[len+1] = 0;
	return len+1;
}
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 = udev = to_usb_device (dev);
	int			config, value;

	if (sscanf (buf, "%u", &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;					\
	int len;							\
									\
	udev = to_usb_device (dev);					\
	len = snprintf(buf, 256, "%s", udev->name);			\
	if (len < 0)							\
		return 0;						\
	buf[len] = '\n';						\
	buf[len+1] = 0;							\
	return len+1;							\
}									\
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);

/* 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_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,
	NULL,
};
static struct attribute_group dev_attr_grp = {
	.attrs = dev_attrs,
};

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

	sysfs_create_group(&dev->kobj, &dev_attr_grp);

	if (udev->manufacturer)
		device_create_file (dev, &dev_attr_manufacturer);
	if (udev->product)
		device_create_file (dev, &dev_attr_product);
	if (udev->serial)
		device_create_file (dev, &dev_attr_serial);
	device_create_file (dev, &dev_attr_configuration);
	usb_create_ep_files(&dev->kobj, &udev->ep0, udev);
}

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

	usb_remove_ep_files(&dev->kobj, &udev->ep0);
	sysfs_remove_group(&dev->kobj, &dev_attr_grp);

	if (udev->descriptor.iManufacturer)
		device_remove_file(dev, &dev_attr_manufacturer);
	if (udev->descriptor.iProduct)
		device_remove_file(dev, &dev_attr_product);
	if (udev->descriptor.iSerialNumber)
		device_remove_file(dev, &dev_attr_serial);
	device_remove_file (dev, &dev_attr_configuration);
}

/* 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;
	int len;

	intf = to_usb_interface(dev);
	udev = interface_to_usbdev(intf);

	len = sprintf(buf, "usb:v%04Xp%04Xd%04Xdc%02Xdsc%02Xdp%02Xic",
			       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);
	buf += len;

	if (udev->descriptor.bDeviceClass == 0) {
		struct usb_host_interface *alt = intf->cur_altsetting;

		return len + sprintf(buf, "%02Xisc%02Xip%02X\n",
			       alt->desc.bInterfaceClass,
			       alt->desc.bInterfaceSubClass,
			       alt->desc.bInterfaceProtocol);
 	} else {
		return len + sprintf(buf, "*isc*ip*\n");
	}
}
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 void usb_create_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_create_ep_files(&intf->dev.kobj, &iface_desc->endpoint[i],
				    interface_to_usbdev(intf));
}

static 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(&intf->dev.kobj, &iface_desc->endpoint[i]);
}

void usb_create_sysfs_intf_files (struct usb_interface *intf)
{
	sysfs_create_group(&intf->dev.kobj, &intf_attr_grp);

	if (intf->cur_altsetting->string)
		device_create_file(&intf->dev, &dev_attr_interface);
	usb_create_intf_ep_files(intf);
}

void usb_remove_sysfs_intf_files (struct usb_interface *intf)
{
	usb_remove_intf_ep_files(intf);
	sysfs_remove_group(&intf->dev.kobj, &intf_attr_grp);

	if (intf->cur_altsetting->string)
		device_remove_file(&intf->dev, &dev_attr_interface);
}