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/spinlock.h>
14 #include <linux/slab.h>
15 #include <linux/idr.h>
16 #include <linux/usb.h>
20 struct usb_endpoint_descriptor *desc;
21 struct usb_device *udev;
24 #define to_ep_device(_dev) \
25 container_of(_dev, struct ep_device, dev)
28 struct attribute attr;
29 ssize_t (*show)(struct usb_device *,
30 struct usb_endpoint_descriptor *, char *);
32 #define to_ep_attribute(_attr) \
33 container_of(_attr, struct ep_attribute, attr)
35 #define usb_ep_attr(field, format_string) \
36 static ssize_t show_ep_##field(struct device *dev, \
37 struct device_attribute *attr, \
40 struct ep_device *ep = to_ep_device(dev); \
41 return sprintf(buf, format_string, ep->desc->field); \
43 static DEVICE_ATTR(field, S_IRUGO, show_ep_##field, NULL);
45 usb_ep_attr(bLength, "%02x\n")
46 usb_ep_attr(bEndpointAddress, "%02x\n")
47 usb_ep_attr(bmAttributes, "%02x\n")
48 usb_ep_attr(bInterval, "%02x\n")
50 static ssize_t show_ep_wMaxPacketSize(struct device *dev,
51 struct device_attribute *attr, char *buf)
53 struct ep_device *ep = to_ep_device(dev);
54 return sprintf(buf, "%04x\n",
55 usb_endpoint_maxp(ep->desc) & 0x07ff);
57 static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL);
59 static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr,
62 struct ep_device *ep = to_ep_device(dev);
63 char *type = "unknown";
65 switch (usb_endpoint_type(ep->desc)) {
66 case USB_ENDPOINT_XFER_CONTROL:
69 case USB_ENDPOINT_XFER_ISOC:
72 case USB_ENDPOINT_XFER_BULK:
75 case USB_ENDPOINT_XFER_INT:
79 return sprintf(buf, "%s\n", type);
81 static DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL);
83 static ssize_t show_ep_interval(struct device *dev,
84 struct device_attribute *attr, char *buf)
86 struct ep_device *ep = to_ep_device(dev);
88 unsigned interval = 0;
91 in = (ep->desc->bEndpointAddress & USB_DIR_IN);
93 switch (usb_endpoint_type(ep->desc)) {
94 case USB_ENDPOINT_XFER_CONTROL:
95 if (ep->udev->speed == USB_SPEED_HIGH)
97 interval = ep->desc->bInterval;
100 case USB_ENDPOINT_XFER_ISOC:
101 interval = 1 << (ep->desc->bInterval - 1);
104 case USB_ENDPOINT_XFER_BULK:
105 if (ep->udev->speed == USB_SPEED_HIGH && !in)
106 /* uframes per NAK */
107 interval = ep->desc->bInterval;
110 case USB_ENDPOINT_XFER_INT:
111 if (ep->udev->speed == USB_SPEED_HIGH)
112 interval = 1 << (ep->desc->bInterval - 1);
114 interval = ep->desc->bInterval;
117 interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
125 return sprintf(buf, "%d%cs\n", interval, unit);
127 static DEVICE_ATTR(interval, S_IRUGO, show_ep_interval, NULL);
129 static ssize_t show_ep_direction(struct device *dev,
130 struct device_attribute *attr, char *buf)
132 struct ep_device *ep = to_ep_device(dev);
135 if (usb_endpoint_xfer_control(ep->desc))
137 else if (usb_endpoint_dir_in(ep->desc))
141 return sprintf(buf, "%s\n", direction);
143 static DEVICE_ATTR(direction, S_IRUGO, show_ep_direction, NULL);
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,
153 &dev_attr_direction.attr,
156 static struct attribute_group ep_dev_attr_grp = {
157 .attrs = ep_dev_attrs,
159 static const struct attribute_group *ep_dev_groups[] = {
164 static void ep_device_release(struct device *dev)
166 struct ep_device *ep_dev = to_ep_device(dev);
171 struct device_type usb_ep_device_type = {
172 .name = "usb_endpoint",
173 .release = ep_device_release,
176 int usb_create_ep_devs(struct device *parent,
177 struct usb_host_endpoint *endpoint,
178 struct usb_device *udev)
180 struct ep_device *ep_dev;
183 ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
189 ep_dev->desc = &endpoint->desc;
191 ep_dev->dev.groups = ep_dev_groups;
192 ep_dev->dev.type = &usb_ep_device_type;
193 ep_dev->dev.parent = parent;
194 dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress);
196 retval = device_register(&ep_dev->dev);
200 device_enable_async_suspend(&ep_dev->dev);
201 endpoint->ep_dev = ep_dev;
205 put_device(&ep_dev->dev);
210 void usb_remove_ep_devs(struct usb_host_endpoint *endpoint)
212 struct ep_device *ep_dev = endpoint->ep_dev;
215 device_unregister(&ep_dev->dev);
216 endpoint->ep_dev = NULL;