[mirror_ubuntu-zesty-kernel.git] / drivers / usb / core / endpoint.c

/*
 * drivers/usb/core/endpoint.c
 *
 * (C) Copyright 2002,2004,2006 Greg Kroah-Hartman
 * (C) Copyright 2002,2004 IBM Corp.
 * (C) Copyright 2006 Novell Inc.
 *
 * Endpoint sysfs stuff
 *
 */

#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/idr.h>
#include <linux/usb.h>
#include "usb.h"

#define MAX_ENDPOINT_MINORS (64*128*32)
static int usb_endpoint_major;
static DEFINE_IDR(endpoint_idr);

struct ep_device {
	struct usb_endpoint_descriptor *desc;
	struct usb_device *udev;
	struct device dev;
	int minor;
};
#define to_ep_device(_dev) \
	container_of(_dev, struct ep_device, dev)

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 usb_ep_attr(field, format_string)			\
static ssize_t show_ep_##field(struct device *dev,		\
			       struct device_attribute *attr,	\
			       char *buf)			\
{								\
	struct ep_device *ep = to_ep_device(dev);		\
	return sprintf(buf, format_string, ep->desc->field);	\
}								\
static DEVICE_ATTR(field, S_IRUGO, show_ep_##field, NULL);

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 device *dev,
				      struct device_attribute *attr, char *buf)
{
	struct ep_device *ep = to_ep_device(dev);
	return sprintf(buf, "%04x\n",
			le16_to_cpu(ep->desc->wMaxPacketSize) & 0x07ff);
}
static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL);

static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	struct ep_device *ep = to_ep_device(dev);
	char *type = "unknown";

	switch (ep->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 DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL);

static ssize_t show_ep_interval(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct ep_device *ep = to_ep_device(dev);
	char unit;
	unsigned interval = 0;
	unsigned in;

	in = (ep->desc->bEndpointAddress & USB_DIR_IN);

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

static ssize_t show_ep_direction(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct ep_device *ep = to_ep_device(dev);
	char *direction;

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

static struct attribute *ep_dev_attrs[] = {
	&dev_attr_bLength.attr,
	&dev_attr_bEndpointAddress.attr,
	&dev_attr_bmAttributes.attr,
	&dev_attr_bInterval.attr,
	&dev_attr_wMaxPacketSize.attr,
	&dev_attr_interval.attr,
	&dev_attr_type.attr,
	&dev_attr_direction.attr,
	NULL,
};
static struct attribute_group ep_dev_attr_grp = {
	.attrs = ep_dev_attrs,
};
static struct attribute_group *ep_dev_groups[] = {
	&ep_dev_attr_grp,
	NULL
};

static int usb_endpoint_major_init(void)
{
	dev_t dev;
	int error;

	error = alloc_chrdev_region(&dev, 0, MAX_ENDPOINT_MINORS,
				    "usb_endpoint");
	if (error) {
		err("unable to get a dynamic major for usb endpoints");
		return error;
	}
	usb_endpoint_major = MAJOR(dev);

	return error;
}

static void usb_endpoint_major_cleanup(void)
{
	unregister_chrdev_region(MKDEV(usb_endpoint_major, 0),
				 MAX_ENDPOINT_MINORS);
}

static int endpoint_get_minor(struct ep_device *ep_dev)
{
	static DEFINE_MUTEX(minor_lock);
	int retval = -ENOMEM;
	int id;

	mutex_lock(&minor_lock);
	if (idr_pre_get(&endpoint_idr, GFP_KERNEL) == 0)
		goto exit;

	retval = idr_get_new(&endpoint_idr, ep_dev, &id);
	if (retval < 0) {
		if (retval == -EAGAIN)
			retval = -ENOMEM;
		goto exit;
	}
	ep_dev->minor = id & MAX_ID_MASK;
exit:
	mutex_unlock(&minor_lock);
	return retval;
}

static void endpoint_free_minor(struct ep_device *ep_dev)
{
	idr_remove(&endpoint_idr, ep_dev->minor);
}

static struct endpoint_class {
	struct kref kref;
	struct class *class;
} *ep_class;

static int init_endpoint_class(void)
{
	int result = 0;

	if (ep_class != NULL) {
		kref_get(&ep_class->kref);
		goto exit;
	}

	ep_class = kmalloc(sizeof(*ep_class), GFP_KERNEL);
	if (!ep_class) {
		result = -ENOMEM;
		goto exit;
	}

	kref_init(&ep_class->kref);
	ep_class->class = class_create(THIS_MODULE, "usb_endpoint");
	if (IS_ERR(ep_class->class)) {
		result = PTR_ERR(ep_class->class);
		goto class_create_error;
	}

	result = usb_endpoint_major_init();
	if (result)
		goto endpoint_major_error;

	goto exit;

endpoint_major_error:
	class_destroy(ep_class->class);
class_create_error:
	kfree(ep_class);
	ep_class = NULL;
exit:
	return result;
}

static void release_endpoint_class(struct kref *kref)
{
	/* Ok, we cheat as we know we only have one ep_class */
	class_destroy(ep_class->class);
	kfree(ep_class);
	ep_class = NULL;
	usb_endpoint_major_cleanup();
}

static void destroy_endpoint_class(void)
{
	if (ep_class)
		kref_put(&ep_class->kref, release_endpoint_class);
}

static void ep_device_release(struct device *dev)
{
	struct ep_device *ep_dev = to_ep_device(dev);

	endpoint_free_minor(ep_dev);
	kfree(ep_dev);
}

int usb_create_ep_files(struct device *parent,
			struct usb_host_endpoint *endpoint,
			struct usb_device *udev)
{
	char name[8];
	struct ep_device *ep_dev;
	int retval;

	retval = init_endpoint_class();
	if (retval)
		goto exit;

	ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
	if (!ep_dev) {
		retval = -ENOMEM;
		goto error_alloc;
	}

	retval = endpoint_get_minor(ep_dev);
	if (retval) {
		dev_err(parent, "can not allocate minor number for %s\n",
			dev_name(&ep_dev->dev));
		goto error_register;
	}

	ep_dev->desc = &endpoint->desc;
	ep_dev->udev = udev;
	ep_dev->dev.groups = ep_dev_groups;
	ep_dev->dev.devt = MKDEV(usb_endpoint_major, ep_dev->minor);
	ep_dev->dev.class = ep_class->class;
	ep_dev->dev.parent = parent;
	ep_dev->dev.release = ep_device_release;
	snprintf(ep_dev->dev.bus_id, BUS_ID_SIZE, "usbdev%d.%d_ep%02x",
		 udev->bus->busnum, udev->devnum,
		 endpoint->desc.bEndpointAddress);

	retval = device_register(&ep_dev->dev);
	if (retval)
		goto error_chrdev;

	/* create the symlink to the old-style "ep_XX" directory */
	sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
	retval = sysfs_create_link(&parent->kobj, &ep_dev->dev.kobj, name);
	if (retval)
		goto error_link;
	endpoint->ep_dev = ep_dev;
	return retval;

error_link:
	device_unregister(&ep_dev->dev);
	destroy_endpoint_class();
	return retval;

error_chrdev:
	endpoint_free_minor(ep_dev);

error_register:
	kfree(ep_dev);
error_alloc:
	destroy_endpoint_class();
exit:
	return retval;
}

void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
{
	struct ep_device *ep_dev = endpoint->ep_dev;

	if (ep_dev) {
		char name[8];

		sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
		sysfs_remove_link(&ep_dev->dev.parent->kobj, name);
		device_unregister(&ep_dev->dev);
		endpoint->ep_dev = NULL;
		destroy_endpoint_class();
	}
}
Commit	Line	Data
84412f62 GKH	1	/*
	2	* drivers/usb/core/endpoint.c
	3	*
	4	* (C) Copyright 2002,2004,2006 Greg Kroah-Hartman
	5	* (C) Copyright 2002,2004 IBM Corp.
	6	* (C) Copyright 2006 Novell Inc.
	7	*
	8	* Endpoint sysfs stuff
	9	*
	10	*/
	11
	12	#include <linux/kernel.h>
7e27780f SB	13	#include <linux/spinlock.h>
7e27780f SB	14	#include <linux/idr.h>
84412f62 GKH	15	#include <linux/usb.h>
	16	#include "usb.h"
	17
7e27780f SB	18	#define MAX_ENDPOINT_MINORS (6412832)
	19	static int usb_endpoint_major;
	20	static DEFINE_IDR(endpoint_idr);
9bde7497 GKH	21
9bde7497 GKH	22	struct ep_device {
84412f62 GKH	23	struct usb_endpoint_descriptor *desc;
84412f62 GKH	24	struct usb_device *udev;
9bde7497	25	struct device dev;
7e27780f	26	int minor;
84412f62	27	};
9bde7497 GKH	28	#define to_ep_device(_dev) \
9bde7497 GKH	29	container_of(_dev, struct ep_device, dev)
84412f62 GKH	30
	31	struct ep_attribute {
	32	struct attribute attr;
	33	ssize_t (show)(struct usb_device ,
	34	struct usb_endpoint_descriptor , char );
	35	};
	36	#define to_ep_attribute(_attr) \
	37	container_of(_attr, struct ep_attribute, attr)
	38
84412f62	39	#define usb_ep_attr(field, format_string) \
9bde7497 GKH	40	static ssize_t show_ep_##field(struct device *dev, \
	41	struct device_attribute *attr, \
	42	char *buf) \
84412f62	43	{ \
9bde7497 GKH	44	struct ep_device *ep = to_ep_device(dev); \
9bde7497 GKH	45	return sprintf(buf, format_string, ep->desc->field); \
84412f62	46	} \
9bde7497	47	static DEVICE_ATTR(field, S_IRUGO, show_ep_##field, NULL);
84412f62 GKH	48
	49	usb_ep_attr(bLength, "%02x\n")
	50	usb_ep_attr(bEndpointAddress, "%02x\n")
	51	usb_ep_attr(bmAttributes, "%02x\n")
	52	usb_ep_attr(bInterval, "%02x\n")
	53
9bde7497 GKH	54	static ssize_t show_ep_wMaxPacketSize(struct device *dev,
9bde7497 GKH	55	struct device_attribute attr, char buf)
84412f62	56	{
9bde7497	57	struct ep_device *ep = to_ep_device(dev);
84412f62	58	return sprintf(buf, "%04x\n",
9bde7497	59	le16_to_cpu(ep->desc->wMaxPacketSize) & 0x07ff);
84412f62	60	}
9bde7497	61	static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL);
84412f62	62
9bde7497 GKH	63	static ssize_t show_ep_type(struct device dev, struct device_attribute attr,
9bde7497 GKH	64	char *buf)
84412f62	65	{
9bde7497	66	struct ep_device *ep = to_ep_device(dev);
84412f62 GKH	67	char *type = "unknown";
84412f62 GKH	68
9bde7497	69	switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
84412f62 GKH	70	case USB_ENDPOINT_XFER_CONTROL:
	71	type = "Control";
	72	break;
	73	case USB_ENDPOINT_XFER_ISOC:
	74	type = "Isoc";
	75	break;
	76	case USB_ENDPOINT_XFER_BULK:
	77	type = "Bulk";
	78	break;
	79	case USB_ENDPOINT_XFER_INT:
	80	type = "Interrupt";
	81	break;
	82	}
	83	return sprintf(buf, "%s\n", type);
	84	}
9bde7497	85	static DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL);
84412f62	86
9bde7497 GKH	87	static ssize_t show_ep_interval(struct device *dev,
9bde7497 GKH	88	struct device_attribute attr, char buf)
84412f62	89	{
9bde7497	90	struct ep_device *ep = to_ep_device(dev);
84412f62 GKH	91	char unit;
	92	unsigned interval = 0;
	93	unsigned in;
	94
9bde7497	95	in = (ep->desc->bEndpointAddress & USB_DIR_IN);
84412f62	96
9bde7497	97	switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
84412f62	98	case USB_ENDPOINT_XFER_CONTROL:
9bde7497 GKH	99	if (ep->udev->speed == USB_SPEED_HIGH) /* uframes per NAK */
9bde7497 GKH	100	interval = ep->desc->bInterval;
84412f62 GKH	101	break;
84412f62 GKH	102	case USB_ENDPOINT_XFER_ISOC:
9bde7497	103	interval = 1 << (ep->desc->bInterval - 1);
84412f62 GKH	104	break;
84412f62 GKH	105	case USB_ENDPOINT_XFER_BULK:
9bde7497 GKH	106	if (ep->udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */
9bde7497 GKH	107	interval = ep->desc->bInterval;
84412f62 GKH	108	break;
84412f62 GKH	109	case USB_ENDPOINT_XFER_INT:
9bde7497 GKH	110	if (ep->udev->speed == USB_SPEED_HIGH)
9bde7497 GKH	111	interval = 1 << (ep->desc->bInterval - 1);
84412f62	112	else
9bde7497	113	interval = ep->desc->bInterval;
84412f62 GKH	114	break;
84412f62 GKH	115	}
9bde7497	116	interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
84412f62 GKH	117	if (interval % 1000)
	118	unit = 'u';
	119	else {
	120	unit = 'm';
	121	interval /= 1000;
	122	}
	123
	124	return sprintf(buf, "%d%cs\n", interval, unit);
	125	}
9bde7497	126	static DEVICE_ATTR(interval, S_IRUGO, show_ep_interval, NULL);
84412f62	127
9bde7497 GKH	128	static ssize_t show_ep_direction(struct device *dev,
9bde7497 GKH	129	struct device_attribute attr, char buf)
84412f62	130	{
9bde7497	131	struct ep_device *ep = to_ep_device(dev);
84412f62 GKH	132	char *direction;
84412f62 GKH	133
9bde7497	134	if ((ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
84412f62 GKH	135	USB_ENDPOINT_XFER_CONTROL)
84412f62 GKH	136	direction = "both";
9bde7497	137	else if (ep->desc->bEndpointAddress & USB_DIR_IN)
84412f62 GKH	138	direction = "in";
	139	else
	140	direction = "out";
	141	return sprintf(buf, "%s\n", direction);
	142	}
9bde7497 GKH	143	static DEVICE_ATTR(direction, S_IRUGO, show_ep_direction, NULL);
	144
	145	static struct attribute *ep_dev_attrs[] = {
	146	&dev_attr_bLength.attr,
	147	&dev_attr_bEndpointAddress.attr,
	148	&dev_attr_bmAttributes.attr,
	149	&dev_attr_bInterval.attr,
	150	&dev_attr_wMaxPacketSize.attr,
	151	&dev_attr_interval.attr,
	152	&dev_attr_type.attr,
	153	&dev_attr_direction.attr,
84412f62 GKH	154	NULL,
84412f62 GKH	155	};
9bde7497 GKH	156	static struct attribute_group ep_dev_attr_grp = {
	157	.attrs = ep_dev_attrs,
	158	};
2e5f10e4 AS	159	static struct attribute_group *ep_dev_groups[] = {
	160	&ep_dev_attr_grp,
	161	NULL
	162	};
84412f62	163
7e27780f SB	164	static int usb_endpoint_major_init(void)
	165	{
	166	dev_t dev;
	167	int error;
	168
	169	error = alloc_chrdev_region(&dev, 0, MAX_ENDPOINT_MINORS,
	170	"usb_endpoint");
	171	if (error) {
	172	err("unable to get a dynamic major for usb endpoints");
	173	return error;
	174	}
	175	usb_endpoint_major = MAJOR(dev);
	176
	177	return error;
	178	}
	179
	180	static void usb_endpoint_major_cleanup(void)
	181	{
	182	unregister_chrdev_region(MKDEV(usb_endpoint_major, 0),
	183	MAX_ENDPOINT_MINORS);
	184	}
	185
	186	static int endpoint_get_minor(struct ep_device *ep_dev)
	187	{
	188	static DEFINE_MUTEX(minor_lock);
	189	int retval = -ENOMEM;
	190	int id;
	191
	192	mutex_lock(&minor_lock);
	193	if (idr_pre_get(&endpoint_idr, GFP_KERNEL) == 0)
	194	goto exit;
	195
	196	retval = idr_get_new(&endpoint_idr, ep_dev, &id);
	197	if (retval < 0) {
	198	if (retval == -EAGAIN)
	199	retval = -ENOMEM;
	200	goto exit;
	201	}
	202	ep_dev->minor = id & MAX_ID_MASK;
	203	exit:
	204	mutex_unlock(&minor_lock);
	205	return retval;
	206	}
	207
	208	static void endpoint_free_minor(struct ep_device *ep_dev)
	209	{
	210	idr_remove(&endpoint_idr, ep_dev->minor);
	211	}
	212
9bde7497 GKH	213	static struct endpoint_class {
	214	struct kref kref;
	215	struct class *class;
	216	} *ep_class;
	217
	218	static int init_endpoint_class(void)
84412f62	219	{
9bde7497 GKH	220	int result = 0;
	221
	222	if (ep_class != NULL) {
	223	kref_get(&ep_class->kref);
	224	goto exit;
	225	}
	226
	227	ep_class = kmalloc(sizeof(*ep_class), GFP_KERNEL);
	228	if (!ep_class) {
	229	result = -ENOMEM;
	230	goto exit;
	231	}
	232
	233	kref_init(&ep_class->kref);
	234	ep_class->class = class_create(THIS_MODULE, "usb_endpoint");
	235	if (IS_ERR(ep_class->class)) {
c5999f0d	236	result = PTR_ERR(ep_class->class);
7e27780f	237	goto class_create_error;
9bde7497 GKH	238	}
9bde7497 GKH	239
7e27780f SB	240	result = usb_endpoint_major_init();
	241	if (result)
	242	goto endpoint_major_error;
	243
	244	goto exit;
	245
	246	endpoint_major_error:
	247	class_destroy(ep_class->class);
	248	class_create_error:
	249	kfree(ep_class);
	250	ep_class = NULL;
9bde7497 GKH	251	exit:
9bde7497 GKH	252	return result;
84412f62 GKH	253	}
84412f62 GKH	254
9bde7497	255	static void release_endpoint_class(struct kref *kref)
84412f62	256	{
9bde7497 GKH	257	/* Ok, we cheat as we know we only have one ep_class */
	258	class_destroy(ep_class->class);
	259	kfree(ep_class);
	260	ep_class = NULL;
7e27780f	261	usb_endpoint_major_cleanup();
9bde7497	262	}
84412f62	263
9bde7497 GKH	264	static void destroy_endpoint_class(void)
	265	{
	266	if (ep_class)
	267	kref_put(&ep_class->kref, release_endpoint_class);
84412f62 GKH	268	}
84412f62 GKH	269
9bde7497 GKH	270	static void ep_device_release(struct device *dev)
	271	{
	272	struct ep_device *ep_dev = to_ep_device(dev);
84412f62	273
c07be136	274	endpoint_free_minor(ep_dev);
9bde7497 GKH	275	kfree(ep_dev);
9bde7497 GKH	276	}
84412f62	277
1b21d5e1 GKH	278	int usb_create_ep_files(struct device *parent,
	279	struct usb_host_endpoint *endpoint,
	280	struct usb_device *udev)
84412f62	281	{
9bde7497 GKH	282	char name[8];
9bde7497 GKH	283	struct ep_device *ep_dev;
9bde7497 GKH	284	int retval;
	285
	286	retval = init_endpoint_class();
	287	if (retval)
	288	goto exit;
84412f62	289
9bde7497 GKH	290	ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
	291	if (!ep_dev) {
	292	retval = -ENOMEM;
d5477c11	293	goto error_alloc;
9bde7497	294	}
84412f62	295
7e27780f SB	296	retval = endpoint_get_minor(ep_dev);
7e27780f SB	297	if (retval) {
898eb71c	298	dev_err(parent, "can not allocate minor number for %s\n",
7071a3ce	299	dev_name(&ep_dev->dev));
7e27780f SB	300	goto error_register;
7e27780f SB	301	}
84412f62	302
9bde7497 GKH	303	ep_dev->desc = &endpoint->desc;
9bde7497 GKH	304	ep_dev->udev = udev;
2e5f10e4	305	ep_dev->dev.groups = ep_dev_groups;
7e27780f	306	ep_dev->dev.devt = MKDEV(usb_endpoint_major, ep_dev->minor);
9bde7497 GKH	307	ep_dev->dev.class = ep_class->class;
	308	ep_dev->dev.parent = parent;
	309	ep_dev->dev.release = ep_device_release;
	310	snprintf(ep_dev->dev.bus_id, BUS_ID_SIZE, "usbdev%d.%d_ep%02x",
	311	udev->bus->busnum, udev->devnum,
	312	endpoint->desc.bEndpointAddress);
84412f62	313
9bde7497 GKH	314	retval = device_register(&ep_dev->dev);
9bde7497 GKH	315	if (retval)
7e27780f	316	goto error_chrdev;
9bde7497	317
9bde7497 GKH	318	/* create the symlink to the old-style "ep_XX" directory */
9bde7497 GKH	319	sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
d5477c11	320	retval = sysfs_create_link(&parent->kobj, &ep_dev->dev.kobj, name);
1b21d5e1 GKH	321	if (retval)
1b21d5e1 GKH	322	goto error_link;
d5477c11	323	endpoint->ep_dev = ep_dev;
1b21d5e1 GKH	324	return retval;
	325
	326	error_link:
1b21d5e1	327	device_unregister(&ep_dev->dev);
1b21d5e1 GKH	328	destroy_endpoint_class();
1b21d5e1 GKH	329	return retval;
d5477c11	330
7e27780f SB	331	error_chrdev:
	332	endpoint_free_minor(ep_dev);
	333
d5477c11	334	error_register:
9bde7497	335	kfree(ep_dev);
d5477c11	336	error_alloc:
1b21d5e1	337	destroy_endpoint_class();
d5477c11	338	exit:
1b21d5e1	339	return retval;
84412f62 GKH	340	}
	341
	342	void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
	343	{
7e27780f	344	struct ep_device *ep_dev = endpoint->ep_dev;
84412f62	345
7e27780f	346	if (ep_dev) {
9bde7497 GKH	347	char name[8];
	348
	349	sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
7e27780f	350	sysfs_remove_link(&ep_dev->dev.parent->kobj, name);
7e27780f	351	device_unregister(&ep_dev->dev);
9bde7497	352	endpoint->ep_dev = NULL;
c40fd5ea	353	destroy_endpoint_class();
84412f62 GKH	354	}
84412f62 GKH	355	}