1 /*
2 * uvc_status.c -- USB Video Class driver - Status endpoint
3 *
4 * Copyright (C) 2007-2009
5 * Laurent Pinchart (laurent.pinchart@skynet.be)
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 */
13
14 #include <linux/kernel.h>
15 #include <linux/input.h>
16 #include <linux/usb.h>
17 #include <linux/usb/input.h>
18
19 #include "uvcvideo.h"
20
21 /* --------------------------------------------------------------------------
22 * Input device
23 */
24 #ifdef CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV
25 static int uvc_input_init(struct uvc_device *dev)
26 {
27 struct input_dev *input;
28 int ret;
29
30 input = input_allocate_device();
31 if (input == NULL)
32 return -ENOMEM;
33
34 usb_make_path(dev->udev, dev->input_phys, sizeof(dev->input_phys));
35 strlcat(dev->input_phys, "/button", sizeof(dev->input_phys));
36
37 input->name = dev->name;
38 input->phys = dev->input_phys;
39 usb_to_input_id(dev->udev, &input->id);
40 input->dev.parent = &dev->intf->dev;
41
42 __set_bit(EV_KEY, input->evbit);
43 __set_bit(KEY_CAMERA, input->keybit);
44
45 if ((ret = input_register_device(input)) < 0)
46 goto error;
47
48 dev->input = input;
49 return 0;
50
51 error:
52 input_free_device(input);
53 return ret;
54 }
55
56 static void uvc_input_cleanup(struct uvc_device *dev)
57 {
58 if (dev->input)
59 input_unregister_device(dev->input);
60 }
61
62 static void uvc_input_report_key(struct uvc_device *dev, unsigned int code,
63 int value)
64 {
65 if (dev->input) {
66 input_report_key(dev->input, code, value);
67 input_sync(dev->input);
68 }
69 }
70
71 #else
72 #define uvc_input_init(dev)
73 #define uvc_input_cleanup(dev)
74 #define uvc_input_report_key(dev, code, value)
75 #endif /* CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV */
76
77 /* --------------------------------------------------------------------------
78 * Status interrupt endpoint
79 */
80 static void uvc_event_streaming(struct uvc_device *dev, __u8 *data, int len)
81 {
82 if (len < 3) {
83 uvc_trace(UVC_TRACE_STATUS, "Invalid streaming status event "
84 "received.\n");
85 return;
86 }
87
88 if (data[2] == 0) {
89 if (len < 4)
90 return;
91 uvc_trace(UVC_TRACE_STATUS, "Button (intf %u) %s len %d\n",
92 data[1], data[3] ? "pressed" : "released", len);
93 uvc_input_report_key(dev, KEY_CAMERA, data[3]);
94 } else {
95 uvc_trace(UVC_TRACE_STATUS, "Stream %u error event %02x %02x "
96 "len %d.\n", data[1], data[2], data[3], len);
97 }
98 }
99
100 static void uvc_event_control(struct uvc_device *dev, __u8 *data, int len)
101 {
102 char *attrs[3] = { "value", "info", "failure" };
103
104 if (len < 6 || data[2] != 0 || data[4] > 2) {
105 uvc_trace(UVC_TRACE_STATUS, "Invalid control status event "
106 "received.\n");
107 return;
108 }
109
110 uvc_trace(UVC_TRACE_STATUS, "Control %u/%u %s change len %d.\n",
111 data[1], data[3], attrs[data[4]], len);
112 }
113
114 static void uvc_status_complete(struct urb *urb)
115 {
116 struct uvc_device *dev = urb->context;
117 int len, ret;
118
119 switch (urb->status) {
120 case 0:
121 break;
122
123 case -ENOENT: /* usb_kill_urb() called. */
124 case -ECONNRESET: /* usb_unlink_urb() called. */
125 case -ESHUTDOWN: /* The endpoint is being disabled. */
126 case -EPROTO: /* Device is disconnected (reported by some
127 * host controller). */
128 return;
129
130 default:
131 uvc_printk(KERN_WARNING, "Non-zero status (%d) in status "
132 "completion handler.\n", urb->status);
133 return;
134 }
135
136 len = urb->actual_length;
137 if (len > 0) {
138 switch (dev->status[0] & 0x0f) {
139 case UVC_STATUS_TYPE_CONTROL:
140 uvc_event_control(dev, dev->status, len);
141 break;
142
143 case UVC_STATUS_TYPE_STREAMING:
144 uvc_event_streaming(dev, dev->status, len);
145 break;
146
147 default:
148 uvc_trace(UVC_TRACE_STATUS, "Unknown status event "
149 "type %u.\n", dev->status[0]);
150 break;
151 }
152 }
153
154 /* Resubmit the URB. */
155 urb->interval = dev->int_ep->desc.bInterval;
156 if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
157 uvc_printk(KERN_ERR, "Failed to resubmit status URB (%d).\n",
158 ret);
159 }
160 }
161
162 int uvc_status_init(struct uvc_device *dev)
163 {
164 struct usb_host_endpoint *ep = dev->int_ep;
165 unsigned int pipe;
166 int interval;
167
168 if (ep == NULL)
169 return 0;
170
171 uvc_input_init(dev);
172
173 dev->status = kzalloc(UVC_MAX_STATUS_SIZE, GFP_KERNEL);
174 if (dev->status == NULL)
175 return -ENOMEM;
176
177 dev->int_urb = usb_alloc_urb(0, GFP_KERNEL);
178 if (dev->int_urb == NULL) {
179 kfree(dev->status);
180 return -ENOMEM;
181 }
182
183 pipe = usb_rcvintpipe(dev->udev, ep->desc.bEndpointAddress);
184
185 /* For high-speed interrupt endpoints, the bInterval value is used as
186 * an exponent of two. Some developers forgot about it.
187 */
188 interval = ep->desc.bInterval;
189 if (interval > 16 && dev->udev->speed == USB_SPEED_HIGH &&
190 (dev->quirks & UVC_QUIRK_STATUS_INTERVAL))
191 interval = fls(interval) - 1;
192
193 usb_fill_int_urb(dev->int_urb, dev->udev, pipe,
194 dev->status, UVC_MAX_STATUS_SIZE, uvc_status_complete,
195 dev, interval);
196
197 return 0;
198 }
199
200 void uvc_status_cleanup(struct uvc_device *dev)
201 {
202 usb_kill_urb(dev->int_urb);
203 usb_free_urb(dev->int_urb);
204 kfree(dev->status);
205 uvc_input_cleanup(dev);
206 }
207
208 int uvc_status_start(struct uvc_device *dev)
209 {
210 if (dev->int_urb == NULL)
211 return 0;
212
213 return usb_submit_urb(dev->int_urb, GFP_KERNEL);
214 }
215
216 void uvc_status_stop(struct uvc_device *dev)
217 {
218 usb_kill_urb(dev->int_urb);
219 }
220
221 int uvc_status_suspend(struct uvc_device *dev)
222 {
223 if (atomic_read(&dev->users))
224 usb_kill_urb(dev->int_urb);
225
226 return 0;
227 }
228
229 int uvc_status_resume(struct uvc_device *dev)
230 {
231 if (dev->int_urb == NULL || atomic_read(&dev->users) == 0)
232 return 0;
233
234 return usb_submit_urb(dev->int_urb, GFP_NOIO);
235 }
236
237
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