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/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 field##_show(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_RO(field)
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 wMaxPacketSize_show(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 usb_endpoint_maxp(ep->desc) & 0x07ff);
56 static DEVICE_ATTR_RO(wMaxPacketSize);
58 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
61 struct ep_device *ep = to_ep_device(dev);
62 char *type = "unknown";
64 switch (usb_endpoint_type(ep->desc)) {
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_RO(type);
82 static ssize_t interval_show(struct device *dev, struct device_attribute *attr,
85 struct ep_device *ep = to_ep_device(dev);
87 unsigned interval = 0;
90 in = (ep->desc->bEndpointAddress & USB_DIR_IN);
92 switch (usb_endpoint_type(ep->desc)) {
93 case USB_ENDPOINT_XFER_CONTROL:
94 if (ep->udev->speed == USB_SPEED_HIGH)
96 interval = ep->desc->bInterval;
99 case USB_ENDPOINT_XFER_ISOC:
100 interval = 1 << (ep->desc->bInterval - 1);
103 case USB_ENDPOINT_XFER_BULK:
104 if (ep->udev->speed == USB_SPEED_HIGH && !in)
105 /* uframes per NAK */
106 interval = ep->desc->bInterval;
109 case USB_ENDPOINT_XFER_INT:
110 if (ep->udev->speed == USB_SPEED_HIGH)
111 interval = 1 << (ep->desc->bInterval - 1);
113 interval = ep->desc->bInterval;
116 interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
124 return sprintf(buf, "%d%cs\n", interval, unit);
126 static DEVICE_ATTR_RO(interval);
128 static ssize_t direction_show(struct device *dev, struct device_attribute *attr,
131 struct ep_device *ep = to_ep_device(dev);
134 if (usb_endpoint_xfer_control(ep->desc))
136 else if (usb_endpoint_dir_in(ep->desc))
140 return sprintf(buf, "%s\n", direction);
142 static DEVICE_ATTR_RO(direction);
144 static struct attribute *ep_dev_attrs[] = {
145 &dev_attr_bLength.attr,
146 &dev_attr_bEndpointAddress.attr,
147 &dev_attr_bmAttributes.attr,
148 &dev_attr_bInterval.attr,
149 &dev_attr_wMaxPacketSize.attr,
150 &dev_attr_interval.attr,
152 &dev_attr_direction.attr,
155 static struct attribute_group ep_dev_attr_grp = {
156 .attrs = ep_dev_attrs,
158 static const struct attribute_group *ep_dev_groups[] = {
163 static void ep_device_release(struct device *dev)
165 struct ep_device *ep_dev = to_ep_device(dev);
170 struct device_type usb_ep_device_type = {
171 .name = "usb_endpoint",
172 .release = ep_device_release,
175 int usb_create_ep_devs(struct device *parent,
176 struct usb_host_endpoint *endpoint,
177 struct usb_device *udev)
179 struct ep_device *ep_dev;
182 ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
188 ep_dev->desc = &endpoint->desc;
190 ep_dev->dev.groups = ep_dev_groups;
191 ep_dev->dev.type = &usb_ep_device_type;
192 ep_dev->dev.parent = parent;
193 dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress);
195 retval = device_register(&ep_dev->dev);
199 device_enable_async_suspend(&ep_dev->dev);
200 endpoint->ep_dev = ep_dev;
204 put_device(&ep_dev->dev);
209 void usb_remove_ep_devs(struct usb_host_endpoint *endpoint)
211 struct ep_device *ep_dev = endpoint->ep_dev;
214 device_unregister(&ep_dev->dev);
215 endpoint->ep_dev = NULL;