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 ep_object {
	struct usb_endpoint_descriptor *desc;
	struct usb_device *udev;
	struct kobject kobj;
};
#define to_ep_object(_kobj) \
	container_of(_kobj, struct ep_object, kobj)

struct ep_attribute {
	struct attribute attr;
	ssize_t (*show)(struct usb_device *,
			struct usb_endpoint_descriptor *, char *);
};
#define to_ep_attribute(_attr) \
	container_of(_attr, struct ep_attribute, attr)

#define EP_ATTR(_name)						\
struct ep_attribute ep_##_name = {				\
	.attr = {.name = #_name, .owner = THIS_MODULE,		\
			.mode = S_IRUGO},			\
	.show = show_ep_##_name}

#define usb_ep_attr(field, format_string)			\
static ssize_t show_ep_##field(struct usb_device *udev,		\
		struct usb_endpoint_descriptor *desc, 		\
		char *buf)					\
{								\
	return sprintf(buf, format_string, desc->field);	\
}								\
static EP_ATTR(field);

usb_ep_attr(bLength, "%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 usb_device *udev,
		struct usb_endpoint_descriptor *desc, char *buf)
{
	return sprintf(buf, "%04x\n",
			le16_to_cpu(desc->wMaxPacketSize) & 0x07ff);
}
static EP_ATTR(wMaxPacketSize);

static ssize_t show_ep_type(struct usb_device *udev,
		struct usb_endpoint_descriptor *desc, char *buf)
{
	char *type = "unknown";

	switch (desc->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 EP_ATTR(type);

static ssize_t show_ep_interval(struct usb_device *udev,
		struct usb_endpoint_descriptor *desc, char *buf)
{
	char unit;
	unsigned interval = 0;
	unsigned in;

	in = (desc->bEndpointAddress & USB_DIR_IN);

	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
	case USB_ENDPOINT_XFER_CONTROL:
		if (udev->speed == USB_SPEED_HIGH) 	/* uframes per NAK */
			interval = desc->bInterval;
		break;
	case USB_ENDPOINT_XFER_ISOC:
		interval = 1 << (desc->bInterval - 1);
		break;
	case USB_ENDPOINT_XFER_BULK:
		if (udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */
			interval = desc->bInterval;
		break;
	case USB_ENDPOINT_XFER_INT:
		if (udev->speed == USB_SPEED_HIGH)
			interval = 1 << (desc->bInterval - 1);
		else
			interval = desc->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 EP_ATTR(interval);

static ssize_t show_ep_direction(struct usb_device *udev,
		struct usb_endpoint_descriptor *desc, char *buf)
{
	char *direction;

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

static struct attribute *ep_attrs[] = {
	&ep_bLength.attr,
	&ep_bEndpointAddress.attr,
	&ep_bmAttributes.attr,
	&ep_bInterval.attr,
	&ep_wMaxPacketSize.attr,
	&ep_type.attr,
	&ep_interval.attr,
	&ep_direction.attr,
	NULL,
};

static void ep_object_release(struct kobject *kobj)
{
	kfree(to_ep_object(kobj));
}

static ssize_t ep_object_show(struct kobject *kobj, struct attribute *attr,
		char *buf)
{
	struct ep_object *ep_obj = to_ep_object(kobj);
	struct ep_attribute *ep_attr = to_ep_attribute(attr);

	return (ep_attr->show)(ep_obj->udev, ep_obj->desc, buf);
}

static struct sysfs_ops ep_object_sysfs_ops = {
	.show =			ep_object_show,
};

static struct kobj_type ep_object_ktype = {
	.release =		ep_object_release,
	.sysfs_ops =		&ep_object_sysfs_ops,
	.default_attrs =	ep_attrs,
};

static void usb_create_ep_files(struct kobject *parent,
		struct usb_host_endpoint *endpoint,
		struct usb_device *udev)
{
	struct ep_object *ep_obj;
	struct kobject *kobj;

	ep_obj = kzalloc(sizeof(struct ep_object), GFP_KERNEL);
	if (!ep_obj)
		return;

	ep_obj->desc = &endpoint->desc;
	ep_obj->udev = udev;

	kobj = &ep_obj->kobj;
	kobject_set_name(kobj, "ep_%02x", endpoint->desc.bEndpointAddress);
	kobj->parent = parent;
	kobj->ktype = &ep_object_ktype;

	/* Don't use kobject_register, because it generates a hotplug event */
	kobject_init(kobj);
	if (kobject_add(kobj) == 0)
		endpoint->kobj = kobj;
	else
		kobject_put(kobj);
}

static void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
{

	if (endpoint->kobj) {
		kobject_del(endpoint->kobj);
		kobject_put(endpoint->kobj);
		endpoint->kobj = NULL;
	}
}

/* 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 = 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;					\
									\
	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);

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

	if (udev->manufacturer)
		device_remove_file(dev, &dev_attr_manufacturer);
	if (udev->product)
		device_remove_file(dev, &dev_attr_product);
	if (udev->serial)
		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;
	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.kobj, &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]);
}

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;

	sysfs_create_group(&intf->dev.kobj, &intf_attr_grp);

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

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);
}