Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6.git] / drivers / usb / core / endpoint.c
1 /*
2  * drivers/usb/core/endpoint.c
3  *
4  * (C) Copyright 2002,2004,2006 Greg Kroah-Hartman
5  * (C) Copyright 2002,2004 IBM Corp.
6  * (C) Copyright 2006 Novell Inc.
7  *
8  * Endpoint sysfs stuff
9  *
10  */
11
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>
17 #include "usb.h"
18
19 struct ep_device {
20         struct usb_endpoint_descriptor *desc;
21         struct usb_device *udev;
22         struct device dev;
23 };
24 #define to_ep_device(_dev) \
25         container_of(_dev, struct ep_device, dev)
26
27 struct device_type usb_ep_device_type = {
28         .name =         "usb_endpoint",
29 };
30
31 struct ep_attribute {
32         struct attribute attr;
33         ssize_t (*show)(struct usb_device *,
34                         struct usb_endpoint_descriptor *, char *);
35 };
36 #define to_ep_attribute(_attr) \
37         container_of(_attr, struct ep_attribute, attr)
38
39 #define usb_ep_attr(field, format_string)                       \
40 static ssize_t show_ep_##field(struct device *dev,              \
41                                struct device_attribute *attr,   \
42                                char *buf)                       \
43 {                                                               \
44         struct ep_device *ep = to_ep_device(dev);               \
45         return sprintf(buf, format_string, ep->desc->field);    \
46 }                                                               \
47 static DEVICE_ATTR(field, S_IRUGO, show_ep_##field, NULL);
48
49 usb_ep_attr(bLength, "%02x\n")
50 usb_ep_attr(bEndpointAddress, "%02x\n")
51 usb_ep_attr(bmAttributes, "%02x\n")
52 usb_ep_attr(bInterval, "%02x\n")
53
54 static ssize_t show_ep_wMaxPacketSize(struct device *dev,
55                                       struct device_attribute *attr, char *buf)
56 {
57         struct ep_device *ep = to_ep_device(dev);
58         return sprintf(buf, "%04x\n",
59                         le16_to_cpu(ep->desc->wMaxPacketSize) & 0x07ff);
60 }
61 static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL);
62
63 static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr,
64                             char *buf)
65 {
66         struct ep_device *ep = to_ep_device(dev);
67         char *type = "unknown";
68
69         switch (usb_endpoint_type(ep->desc)) {
70         case USB_ENDPOINT_XFER_CONTROL:
71                 type = "Control";
72                 break;
73         case USB_ENDPOINT_XFER_ISOC:
74                 type = "Isoc";
75                 break;
76         case USB_ENDPOINT_XFER_BULK:
77                 type = "Bulk";
78                 break;
79         case USB_ENDPOINT_XFER_INT:
80                 type = "Interrupt";
81                 break;
82         }
83         return sprintf(buf, "%s\n", type);
84 }
85 static DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL);
86
87 static ssize_t show_ep_interval(struct device *dev,
88                                 struct device_attribute *attr, char *buf)
89 {
90         struct ep_device *ep = to_ep_device(dev);
91         char unit;
92         unsigned interval = 0;
93         unsigned in;
94
95         in = (ep->desc->bEndpointAddress & USB_DIR_IN);
96
97         switch (usb_endpoint_type(ep->desc)) {
98         case USB_ENDPOINT_XFER_CONTROL:
99                 if (ep->udev->speed == USB_SPEED_HIGH)
100                         /* uframes per NAK */
101                         interval = ep->desc->bInterval;
102                 break;
103
104         case USB_ENDPOINT_XFER_ISOC:
105                 interval = 1 << (ep->desc->bInterval - 1);
106                 break;
107
108         case USB_ENDPOINT_XFER_BULK:
109                 if (ep->udev->speed == USB_SPEED_HIGH && !in)
110                         /* uframes per NAK */
111                         interval = ep->desc->bInterval;
112                 break;
113
114         case USB_ENDPOINT_XFER_INT:
115                 if (ep->udev->speed == USB_SPEED_HIGH)
116                         interval = 1 << (ep->desc->bInterval - 1);
117                 else
118                         interval = ep->desc->bInterval;
119                 break;
120         }
121         interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
122         if (interval % 1000)
123                 unit = 'u';
124         else {
125                 unit = 'm';
126                 interval /= 1000;
127         }
128
129         return sprintf(buf, "%d%cs\n", interval, unit);
130 }
131 static DEVICE_ATTR(interval, S_IRUGO, show_ep_interval, NULL);
132
133 static ssize_t show_ep_direction(struct device *dev,
134                                  struct device_attribute *attr, char *buf)
135 {
136         struct ep_device *ep = to_ep_device(dev);
137         char *direction;
138
139         if (usb_endpoint_xfer_control(ep->desc))
140                 direction = "both";
141         else if (usb_endpoint_dir_in(ep->desc))
142                 direction = "in";
143         else
144                 direction = "out";
145         return sprintf(buf, "%s\n", direction);
146 }
147 static DEVICE_ATTR(direction, S_IRUGO, show_ep_direction, NULL);
148
149 static struct attribute *ep_dev_attrs[] = {
150         &dev_attr_bLength.attr,
151         &dev_attr_bEndpointAddress.attr,
152         &dev_attr_bmAttributes.attr,
153         &dev_attr_bInterval.attr,
154         &dev_attr_wMaxPacketSize.attr,
155         &dev_attr_interval.attr,
156         &dev_attr_type.attr,
157         &dev_attr_direction.attr,
158         NULL,
159 };
160 static struct attribute_group ep_dev_attr_grp = {
161         .attrs = ep_dev_attrs,
162 };
163 static const struct attribute_group *ep_dev_groups[] = {
164         &ep_dev_attr_grp,
165         NULL
166 };
167
168 static void ep_device_release(struct device *dev)
169 {
170         struct ep_device *ep_dev = to_ep_device(dev);
171
172         kfree(ep_dev);
173 }
174
175 int usb_create_ep_devs(struct device *parent,
176                         struct usb_host_endpoint *endpoint,
177                         struct usb_device *udev)
178 {
179         struct ep_device *ep_dev;
180         int retval;
181
182         ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
183         if (!ep_dev) {
184                 retval = -ENOMEM;
185                 goto exit;
186         }
187
188         ep_dev->desc = &endpoint->desc;
189         ep_dev->udev = udev;
190         ep_dev->dev.groups = ep_dev_groups;
191         ep_dev->dev.type = &usb_ep_device_type;
192         ep_dev->dev.parent = parent;
193         ep_dev->dev.release = ep_device_release;
194         dev_set_name(&ep_dev->dev, "ep_%02x", endpoint->desc.bEndpointAddress);
195
196         retval = device_register(&ep_dev->dev);
197         if (retval)
198                 goto error_register;
199
200         device_enable_async_suspend(&ep_dev->dev);
201         endpoint->ep_dev = ep_dev;
202         return retval;
203
204 error_register:
205         put_device(&ep_dev->dev);
206 exit:
207         return retval;
208 }
209
210 void usb_remove_ep_devs(struct usb_host_endpoint *endpoint)
211 {
212         struct ep_device *ep_dev = endpoint->ep_dev;
213
214         if (ep_dev) {
215                 device_unregister(&ep_dev->dev);
216                 endpoint->ep_dev = NULL;
217         }
218 }