2 * drivers/usb/core/endpoint.c
4 * (C) Copyright 2002,2004,2006 Greg Kroah-Hartman
5 * (C) Copyright 2002,2004 IBM Corp.
6 * (C) Copyright 2006 Novell Inc.
12 #include <linux/kernel.h>
13 #include <linux/usb.h>
19 struct usb_endpoint_descriptor *desc;
20 struct usb_device *udev;
23 #define to_ep_device(_dev) \
24 container_of(_dev, struct ep_device, dev)
27 struct attribute attr;
28 ssize_t (*show)(struct usb_device *,
29 struct usb_endpoint_descriptor *, char *);
31 #define to_ep_attribute(_attr) \
32 container_of(_attr, struct ep_attribute, attr)
34 #define usb_ep_attr(field, format_string) \
35 static ssize_t show_ep_##field(struct device *dev, \
36 struct device_attribute *attr, \
39 struct ep_device *ep = to_ep_device(dev); \
40 return sprintf(buf, format_string, ep->desc->field); \
42 static DEVICE_ATTR(field, S_IRUGO, show_ep_##field, NULL);
44 usb_ep_attr(bLength, "%02x\n")
45 usb_ep_attr(bEndpointAddress, "%02x\n")
46 usb_ep_attr(bmAttributes, "%02x\n")
47 usb_ep_attr(bInterval, "%02x\n")
49 static ssize_t show_ep_wMaxPacketSize(struct device *dev,
50 struct device_attribute *attr, char *buf)
52 struct ep_device *ep = to_ep_device(dev);
53 return sprintf(buf, "%04x\n",
54 le16_to_cpu(ep->desc->wMaxPacketSize) & 0x07ff);
56 static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL);
58 static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr,
61 struct ep_device *ep = to_ep_device(dev);
62 char *type = "unknown";
64 switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
65 case USB_ENDPOINT_XFER_CONTROL:
68 case USB_ENDPOINT_XFER_ISOC:
71 case USB_ENDPOINT_XFER_BULK:
74 case USB_ENDPOINT_XFER_INT:
78 return sprintf(buf, "%s\n", type);
80 static DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL);
82 static ssize_t show_ep_interval(struct device *dev,
83 struct device_attribute *attr, char *buf)
85 struct ep_device *ep = to_ep_device(dev);
87 unsigned interval = 0;
90 in = (ep->desc->bEndpointAddress & USB_DIR_IN);
92 switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
93 case USB_ENDPOINT_XFER_CONTROL:
94 if (ep->udev->speed == USB_SPEED_HIGH) /* uframes per NAK */
95 interval = ep->desc->bInterval;
97 case USB_ENDPOINT_XFER_ISOC:
98 interval = 1 << (ep->desc->bInterval - 1);
100 case USB_ENDPOINT_XFER_BULK:
101 if (ep->udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */
102 interval = ep->desc->bInterval;
104 case USB_ENDPOINT_XFER_INT:
105 if (ep->udev->speed == USB_SPEED_HIGH)
106 interval = 1 << (ep->desc->bInterval - 1);
108 interval = ep->desc->bInterval;
111 interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
119 return sprintf(buf, "%d%cs\n", interval, unit);
121 static DEVICE_ATTR(interval, S_IRUGO, show_ep_interval, NULL);
123 static ssize_t show_ep_direction(struct device *dev,
124 struct device_attribute *attr, char *buf)
126 struct ep_device *ep = to_ep_device(dev);
129 if ((ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
130 USB_ENDPOINT_XFER_CONTROL)
132 else if (ep->desc->bEndpointAddress & USB_DIR_IN)
136 return sprintf(buf, "%s\n", direction);
138 static DEVICE_ATTR(direction, S_IRUGO, show_ep_direction, NULL);
140 static struct attribute *ep_dev_attrs[] = {
141 &dev_attr_bLength.attr,
142 &dev_attr_bEndpointAddress.attr,
143 &dev_attr_bmAttributes.attr,
144 &dev_attr_bInterval.attr,
145 &dev_attr_wMaxPacketSize.attr,
146 &dev_attr_interval.attr,
148 &dev_attr_direction.attr,
151 static struct attribute_group ep_dev_attr_grp = {
152 .attrs = ep_dev_attrs,
155 static struct endpoint_class {
160 static int init_endpoint_class(void)
164 if (ep_class != NULL) {
165 kref_get(&ep_class->kref);
169 ep_class = kmalloc(sizeof(*ep_class), GFP_KERNEL);
175 kref_init(&ep_class->kref);
176 ep_class->class = class_create(THIS_MODULE, "usb_endpoint");
177 if (IS_ERR(ep_class->class)) {
178 result = IS_ERR(ep_class->class);
188 static void release_endpoint_class(struct kref *kref)
190 /* Ok, we cheat as we know we only have one ep_class */
191 class_destroy(ep_class->class);
196 static void destroy_endpoint_class(void)
199 kref_put(&ep_class->kref, release_endpoint_class);
202 static void ep_device_release(struct device *dev)
204 struct ep_device *ep_dev = to_ep_device(dev);
206 dev_dbg(dev, "%s called for %s\n", __FUNCTION__, dev->bus_id);
210 int usb_create_ep_files(struct device *parent,
211 struct usb_host_endpoint *endpoint,
212 struct usb_device *udev)
215 struct ep_device *ep_dev;
219 retval = init_endpoint_class();
223 ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
229 /* fun calculation to determine the minor of this endpoint */
230 minor = (((udev->bus->busnum - 1) * 128) * 16) + (udev->devnum - 1);
232 ep_dev->desc = &endpoint->desc;
234 ep_dev->dev.devt = MKDEV(442, minor); // FIXME fake number...
235 ep_dev->dev.class = ep_class->class;
236 ep_dev->dev.parent = parent;
237 ep_dev->dev.release = ep_device_release;
238 snprintf(ep_dev->dev.bus_id, BUS_ID_SIZE, "usbdev%d.%d_ep%02x",
239 udev->bus->busnum, udev->devnum,
240 endpoint->desc.bEndpointAddress);
242 retval = device_register(&ep_dev->dev);
245 retval = sysfs_create_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
249 /* create the symlink to the old-style "ep_XX" directory */
250 sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
251 retval = sysfs_create_link(&parent->kobj, &ep_dev->dev.kobj, name);
254 endpoint->ep_dev = ep_dev;
258 sysfs_remove_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
260 device_unregister(&ep_dev->dev);
261 destroy_endpoint_class();
267 destroy_endpoint_class();
272 void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
275 if (endpoint->ep_dev) {
278 sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
279 sysfs_remove_link(&endpoint->ep_dev->dev.parent->kobj, name);
280 sysfs_remove_group(&endpoint->ep_dev->dev.kobj, &ep_dev_attr_grp);
281 device_unregister(&endpoint->ep_dev->dev);
282 endpoint->ep_dev = NULL;
283 destroy_endpoint_class();