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Commit 9bde7497 authored by Greg Kroah-Hartman's avatar Greg Kroah-Hartman
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[PATCH] USB: make endpoints real struct devices 



This will allow for us to give endpoints a major/minor to create a
"usbfs2-like" way to access endpoints directly from userspace in an
easier manner than the current usbfs provides us.

Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 36679ea5

drivers/usb/core/endpoint.c

+150 −88
Original line number Diff line number Diff line
@@ -14,13 +14,14 @@ 
#include "usb.h"



/* endpoint stuff */

struct ep_object {



struct ep_device {

	struct usb_endpoint_descriptor *desc;

	struct usb_device *udev;

	struct kobject kobj;

	struct device dev;

};

#define to_ep_object(_kobj) \

	container_of(_kobj, struct ep_object, kobj)

#define to_ep_device(_dev) \

	container_of(_dev, struct ep_device, dev)



struct ep_attribute {

	struct attribute attr;
@@ -30,40 +31,37 @@ struct ep_attribute { 
#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, 		\

static ssize_t show_ep_##field(struct device *dev,		\

			       struct device_attribute *attr,	\

			       char *buf)			\

{								\

	return sprintf(buf, format_string, desc->field);	\

	struct ep_device *ep = to_ep_device(dev);		\

	return sprintf(buf, format_string, ep->desc->field);	\

}								\

static EP_ATTR(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 usb_device *udev,

		struct usb_endpoint_descriptor *desc, char *buf)

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(desc->wMaxPacketSize) & 0x07ff);

			le16_to_cpu(ep->desc->wMaxPacketSize) & 0x07ff);

}

static EP_ATTR(wMaxPacketSize);

static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL);



static ssize_t show_ep_type(struct usb_device *udev,

		struct usb_endpoint_descriptor *desc, char *buf)

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 (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {

	switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {

	case USB_ENDPOINT_XFER_CONTROL:

		type = "Control";

		break;
@@ -79,37 +77,38 @@ static ssize_t show_ep_type(struct usb_device *udev, 
	}

	return sprintf(buf, "%s\n", type);

}

static EP_ATTR(type);

static DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL);



static ssize_t show_ep_interval(struct usb_device *udev,

		struct usb_endpoint_descriptor *desc, char *buf)

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 = (desc->bEndpointAddress & USB_DIR_IN);

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



	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {

	switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {

	case USB_ENDPOINT_XFER_CONTROL:

		if (udev->speed == USB_SPEED_HIGH) 	/* uframes per NAK */

			interval = desc->bInterval;

		if (ep->udev->speed == USB_SPEED_HIGH) 	/* uframes per NAK */

			interval = ep->desc->bInterval;

		break;

	case USB_ENDPOINT_XFER_ISOC:

		interval = 1 << (desc->bInterval - 1);

		interval = 1 << (ep->desc->bInterval - 1);

		break;

	case USB_ENDPOINT_XFER_BULK:

		if (udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */

			interval = desc->bInterval;

		if (ep->udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */

			interval = ep->desc->bInterval;

		break;

	case USB_ENDPOINT_XFER_INT:

		if (udev->speed == USB_SPEED_HIGH)

			interval = 1 << (desc->bInterval - 1);

		if (ep->udev->speed == USB_SPEED_HIGH)

			interval = 1 << (ep->desc->bInterval - 1);

		else

			interval = desc->bInterval;

			interval = ep->desc->bInterval;

		break;

	}

	interval *= (udev->speed == USB_SPEED_HIGH) ? 125 : 1000;

	interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;

	if (interval % 1000)

		unit = 'u';

	else {
@@ -119,95 +118,158 @@ static ssize_t show_ep_interval(struct usb_device *udev, 


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

}

static EP_ATTR(interval);

static DEVICE_ATTR(interval, S_IRUGO, show_ep_interval, NULL);



static ssize_t show_ep_direction(struct usb_device *udev,

		struct usb_endpoint_descriptor *desc, char *buf)

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 ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==

	if ((ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==

			USB_ENDPOINT_XFER_CONTROL)

		direction = "both";

	else if (desc->bEndpointAddress & USB_DIR_IN)

	else if (ep->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,

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 void ep_object_release(struct kobject *kobj)

static int init_endpoint_class(void)

{

	kfree(to_ep_object(kobj));

	int result = 0;



	if (ep_class != NULL) {

		kref_get(&ep_class->kref);

		goto exit;

	}



static ssize_t ep_object_show(struct kobject *kobj, struct attribute *attr,

		char *buf)

	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)

{

	struct ep_object *ep_obj = to_ep_object(kobj);

	struct ep_attribute *ep_attr = to_ep_attribute(attr);

	/* Ok, we cheat as we know we only have one ep_class */

	class_destroy(ep_class->class);

	kfree(ep_class);

	ep_class = NULL;

}



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

static void destroy_endpoint_class(void)

{

	if (ep_class)

		kref_put(&ep_class->kref, release_endpoint_class);

}



static struct sysfs_ops ep_object_sysfs_ops = {

	.show =			ep_object_show,

};

static void ep_device_release(struct device *dev)

{

	struct ep_device *ep_dev = to_ep_device(dev);



static struct kobj_type ep_object_ktype = {

	.release =		ep_object_release,

	.sysfs_ops =		&ep_object_sysfs_ops,

	.default_attrs =	ep_attrs,

};

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

	kfree(ep_dev);

}



void usb_create_ep_files(struct device *parent,

			 struct usb_host_endpoint *endpoint,

			 struct usb_device *udev)

{

	struct ep_object *ep_obj;

	struct kobject *kobj;

	char name[8];

	struct ep_device *ep_dev;

	int minor;

	int retval;



	ep_obj = kzalloc(sizeof(struct ep_object), GFP_KERNEL);

	if (!ep_obj)

		return;

	retval = init_endpoint_class();

	if (retval)

		goto exit;



	ep_obj->desc = &endpoint->desc;

	ep_obj->udev = udev;

	ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);

	if (!ep_dev) {

		retval = -ENOMEM;

		goto exit;

	}



	kobj = &ep_obj->kobj;

	kobject_set_name(kobj, "ep_%02x", endpoint->desc.bEndpointAddress);

	kobj->parent = &parent->kobj;

	kobj->ktype = &ep_object_ktype;

	/* fun calculation to determine the minor of this endpoint */

	minor = (((udev->bus->busnum - 1) * 128) * 16) + (udev->devnum - 1);



	/* 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);

	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;

	sysfs_create_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);



	endpoint->ep_dev = ep_dev;



	/* create the symlink to the old-style "ep_XX" directory */

	sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);

	sysfs_create_link(&parent->kobj, &endpoint->ep_dev->dev.kobj, name);



exit:

	return;

error:

	kfree(ep_dev);

	return;

}



void usb_remove_ep_files(struct usb_host_endpoint *endpoint)

{



	if (endpoint->kobj) {

		kobject_del(endpoint->kobj);

		kobject_put(endpoint->kobj);

		endpoint->kobj = NULL;

	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();

}

include/linux/usb.h

+3 −1
Original line number Diff line number Diff line
@@ -40,6 +40,8 @@ struct usb_driver; 
 * Devices may also have class-specific or vendor-specific descriptors.

 */



struct ep_device;



/**

 * struct usb_host_endpoint - host-side endpoint descriptor and queue

 * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder
@@ -57,7 +59,7 @@ struct usb_host_endpoint { 
	struct usb_endpoint_descriptor	desc;

	struct list_head		urb_list;

	void				*hcpriv;

	struct kobject			*kobj;	/* For sysfs info */

	struct ep_device 		*ep_dev;	/* For sysfs info */



	unsigned char *extra;   /* Extra descriptors */

	int extralen;