This source file includes following definitions.
- wMaxPacketSize_show
- type_show
- interval_show
- direction_show
- ep_device_release
- usb_create_ep_devs
- usb_remove_ep_devs
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14 #include <linux/kernel.h>
15 #include <linux/spinlock.h>
16 #include <linux/slab.h>
17 #include <linux/usb.h>
18 #include "usb.h"
19
20 struct ep_device {
21 struct usb_endpoint_descriptor *desc;
22 struct usb_device *udev;
23 struct device dev;
24 };
25 #define to_ep_device(_dev) \
26 container_of(_dev, struct ep_device, dev)
27
28 struct ep_attribute {
29 struct attribute attr;
30 ssize_t (*show)(struct usb_device *,
31 struct usb_endpoint_descriptor *, char *);
32 };
33 #define to_ep_attribute(_attr) \
34 container_of(_attr, struct ep_attribute, attr)
35
36 #define usb_ep_attr(field, format_string) \
37 static ssize_t field##_show(struct device *dev, \
38 struct device_attribute *attr, \
39 char *buf) \
40 { \
41 struct ep_device *ep = to_ep_device(dev); \
42 return sprintf(buf, format_string, ep->desc->field); \
43 } \
44 static DEVICE_ATTR_RO(field)
45
46 usb_ep_attr(bLength, "%02x\n");
47 usb_ep_attr(bEndpointAddress, "%02x\n");
48 usb_ep_attr(bmAttributes, "%02x\n");
49 usb_ep_attr(bInterval, "%02x\n");
50
51 static ssize_t wMaxPacketSize_show(struct device *dev,
52 struct device_attribute *attr, char *buf)
53 {
54 struct ep_device *ep = to_ep_device(dev);
55 return sprintf(buf, "%04x\n", usb_endpoint_maxp(ep->desc));
56 }
57 static DEVICE_ATTR_RO(wMaxPacketSize);
58
59 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
60 char *buf)
61 {
62 struct ep_device *ep = to_ep_device(dev);
63 char *type = "unknown";
64
65 switch (usb_endpoint_type(ep->desc)) {
66 case USB_ENDPOINT_XFER_CONTROL:
67 type = "Control";
68 break;
69 case USB_ENDPOINT_XFER_ISOC:
70 type = "Isoc";
71 break;
72 case USB_ENDPOINT_XFER_BULK:
73 type = "Bulk";
74 break;
75 case USB_ENDPOINT_XFER_INT:
76 type = "Interrupt";
77 break;
78 }
79 return sprintf(buf, "%s\n", type);
80 }
81 static DEVICE_ATTR_RO(type);
82
83 static ssize_t interval_show(struct device *dev, struct device_attribute *attr,
84 char *buf)
85 {
86 struct ep_device *ep = to_ep_device(dev);
87 char unit;
88 unsigned interval = 0;
89 unsigned in;
90
91 in = (ep->desc->bEndpointAddress & USB_DIR_IN);
92
93 switch (usb_endpoint_type(ep->desc)) {
94 case USB_ENDPOINT_XFER_CONTROL:
95 if (ep->udev->speed == USB_SPEED_HIGH)
96
97 interval = ep->desc->bInterval;
98 break;
99
100 case USB_ENDPOINT_XFER_ISOC:
101 interval = 1 << (ep->desc->bInterval - 1);
102 break;
103
104 case USB_ENDPOINT_XFER_BULK:
105 if (ep->udev->speed == USB_SPEED_HIGH && !in)
106
107 interval = ep->desc->bInterval;
108 break;
109
110 case USB_ENDPOINT_XFER_INT:
111 if (ep->udev->speed == USB_SPEED_HIGH)
112 interval = 1 << (ep->desc->bInterval - 1);
113 else
114 interval = ep->desc->bInterval;
115 break;
116 }
117 interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
118 if (interval % 1000)
119 unit = 'u';
120 else {
121 unit = 'm';
122 interval /= 1000;
123 }
124
125 return sprintf(buf, "%d%cs\n", interval, unit);
126 }
127 static DEVICE_ATTR_RO(interval);
128
129 static ssize_t direction_show(struct device *dev, struct device_attribute *attr,
130 char *buf)
131 {
132 struct ep_device *ep = to_ep_device(dev);
133 char *direction;
134
135 if (usb_endpoint_xfer_control(ep->desc))
136 direction = "both";
137 else if (usb_endpoint_dir_in(ep->desc))
138 direction = "in";
139 else
140 direction = "out";
141 return sprintf(buf, "%s\n", direction);
142 }
143 static DEVICE_ATTR_RO(direction);
144
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,
152 &dev_attr_type.attr,
153 &dev_attr_direction.attr,
154 NULL,
155 };
156 static struct attribute_group ep_dev_attr_grp = {
157 .attrs = ep_dev_attrs,
158 };
159 static const struct attribute_group *ep_dev_groups[] = {
160 &ep_dev_attr_grp,
161 NULL
162 };
163
164 static void ep_device_release(struct device *dev)
165 {
166 struct ep_device *ep_dev = to_ep_device(dev);
167
168 kfree(ep_dev);
169 }
170
171 struct device_type usb_ep_device_type = {
172 .name = "usb_endpoint",
173 .release = ep_device_release,
174 };
175
176 int usb_create_ep_devs(struct device *parent,
177 struct usb_host_endpoint *endpoint,
178 struct usb_device *udev)
179 {
180 struct ep_device *ep_dev;
181 int retval;
182
183 ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
184 if (!ep_dev) {
185 retval = -ENOMEM;
186 goto exit;
187 }
188
189 ep_dev->desc = &endpoint->desc;
190 ep_dev->udev = udev;
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);
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 }