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