drivers/usb/core/endpoint.c - maze/linux - Git at Google

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

 /* endpoint stuff */

 struct ep_device {
 	struct usb_endpoint_descriptor *desc;
 	struct usb_device *udev;
 	struct device dev;
 };
 #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 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 = IS_ERR(ep_class->class);
 		kfree(ep_class);
 		ep_class = NULL;
 		goto exit;
 	}

 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;
 }

 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);

 	dev_dbg(dev, "%s called for %s\n", __FUNCTION__, dev->bus_id);
 	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 minor;
 	int retval;

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

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

 	/* fun calculation to determine the minor of this endpoint */
 	minor = (((udev->bus->busnum - 1) * 128) * 16) + (udev->devnum - 1);

 	ep_dev->desc = &endpoint->desc;
 	ep_dev->udev = udev;
 	ep_dev->dev.devt = MKDEV(442, minor);	// FIXME fake number...
 	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;
 	retval = sysfs_create_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
 	if (retval)
 		goto error_group;

 	endpoint->ep_dev = ep_dev;

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

 error_link:
 	sysfs_remove_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);

 error_group:
 	device_unregister(&ep_dev->dev);
 	endpoint->ep_dev = NULL;
 	destroy_endpoint_class();
 	return retval;
 error:
 	kfree(ep_dev);
 	destroy_endpoint_class();
 	return retval;
 }

 void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
 {

 	if (endpoint->ep_dev) {
 		char name[8];

 		sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
 		sysfs_remove_link(&endpoint->ep_dev->dev.parent->kobj, name);
 		sysfs_remove_group(&endpoint->ep_dev->dev.kobj, &ep_dev_attr_grp);
 		device_unregister(&endpoint->ep_dev->dev);
 		endpoint->ep_dev = NULL;
 	}
 	destroy_endpoint_class();
 }
	/*
	* 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/usb.h>
	#include "usb.h"

	/* endpoint stuff */

	struct ep_device {
	struct usb_endpoint_descriptor *desc;
	struct usb_device *udev;
	struct device dev;
	};
	#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 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 = IS_ERR(ep_class->class);
	kfree(ep_class);
	ep_class = NULL;
	goto exit;
	}

	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;
	}

	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);

	dev_dbg(dev, "%s called for %s\n", __FUNCTION__, dev->bus_id);
	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 minor;
	int retval;

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

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

	/* fun calculation to determine the minor of this endpoint */
	minor = (((udev->bus->busnum - 1) * 128) * 16) + (udev->devnum - 1);

	ep_dev->desc = &endpoint->desc;
	ep_dev->udev = udev;
	ep_dev->dev.devt = MKDEV(442, minor); // FIXME fake number...
	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;
	retval = sysfs_create_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
	if (retval)
	goto error_group;

	endpoint->ep_dev = ep_dev;

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

	error_link:
	sysfs_remove_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);

	error_group:
	device_unregister(&ep_dev->dev);
	endpoint->ep_dev = NULL;
	destroy_endpoint_class();
	return retval;
	error:
	kfree(ep_dev);
	destroy_endpoint_class();
	return retval;
	}

	void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
	{

	if (endpoint->ep_dev) {
	char name[8];

	sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
	sysfs_remove_link(&endpoint->ep_dev->dev.parent->kobj, name);
	sysfs_remove_group(&endpoint->ep_dev->dev.kobj, &ep_dev_attr_grp);
	device_unregister(&endpoint->ep_dev->dev);
	endpoint->ep_dev = NULL;
	}
	destroy_endpoint_class();
	}