/* * 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);} void 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;	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->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();}