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V4L/DVB (11220): gspca - finepix: Use a workqueue for streaming.
[linux-2.6-omap-h63xx.git] / drivers / media / video / gspca / finepix.c
1 /*
2  * Fujifilm Finepix subdriver
3  *
4  * Copyright (C) 2008 Frank Zago
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  */
20
21 #define MODULE_NAME "finepix"
22
23 #include "gspca.h"
24
25 MODULE_AUTHOR("Frank Zago <frank@zago.net>");
26 MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
27 MODULE_LICENSE("GPL");
28
29 /* Default timeout, in ms */
30 #define FPIX_TIMEOUT 250
31
32 /* Maximum transfer size to use. The windows driver reads by chunks of
33  * 0x2000 bytes, so do the same. Note: reading more seems to work
34  * too. */
35 #define FPIX_MAX_TRANSFER 0x2000
36
37 /* Structure to hold all of our device specific stuff */
38 struct usb_fpix {
39         struct gspca_dev gspca_dev;     /* !! must be the first item */
40
41         struct work_struct work_struct;
42         struct workqueue_struct *work_thread;
43 };
44
45 /* Delay after which claim the next frame. If the delay is too small,
46  * the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
47  * will fail every 4 or 5 frames, but 30ms is perfect. On the A210,
48  * 30ms is bad while 35ms is perfect. */
49 #define NEXT_FRAME_DELAY 35
50
51 /* These cameras only support 320x200. */
52 static const struct v4l2_pix_format fpix_mode[1] = {
53         { 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
54                 .bytesperline = 320,
55                 .sizeimage = 320 * 240 * 3 / 8 + 590,
56                 .colorspace = V4L2_COLORSPACE_SRGB,
57                 .priv = 0}
58 };
59
60 /* send a command to the webcam */
61 static int command(struct gspca_dev *gspca_dev,
62                 int order)      /* 0: reset, 1: frame request */
63 {
64         static u8 order_values[2][12] = {
65                 {0xc6, 0, 0, 0, 0, 0, 0,    0, 0x20, 0, 0, 0},  /* reset */
66                 {0xd3, 0, 0, 0, 0, 0, 0, 0x01,    0, 0, 0, 0},  /* fr req */
67         };
68
69         memcpy(gspca_dev->usb_buf, order_values[order], 12);
70         return usb_control_msg(gspca_dev->dev,
71                         usb_sndctrlpipe(gspca_dev->dev, 0),
72                         USB_REQ_GET_STATUS,
73                         USB_DIR_OUT | USB_TYPE_CLASS |
74                         USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
75                         12, FPIX_TIMEOUT);
76 }
77
78 /* workqueue */
79 static void dostream(struct work_struct *work)
80 {
81         struct usb_fpix *dev = container_of(work, struct usb_fpix, work_struct);
82         struct gspca_dev *gspca_dev = &dev->gspca_dev;
83         struct urb *urb = gspca_dev->urb[0];
84         u8 *data = urb->transfer_buffer;
85         struct gspca_frame *frame;
86         int ret = 0;
87         int len;
88
89         /* synchronize with the main driver */
90         mutex_lock(&gspca_dev->usb_lock);
91         mutex_unlock(&gspca_dev->usb_lock);
92         PDEBUG(D_STREAM, "dostream started");
93
94         /* loop reading a frame */
95 again:
96         while (gspca_dev->present && gspca_dev->streaming) {
97
98                 /* request a frame */
99                 mutex_lock(&gspca_dev->usb_lock);
100                 ret = command(gspca_dev, 1);
101                 mutex_unlock(&gspca_dev->usb_lock);
102                 if (ret < 0)
103                         break;
104                 if (!gspca_dev->present || !gspca_dev->streaming)
105                         break;
106
107                 /* the frame comes in parts */
108                 for (;;) {
109                         ret = usb_bulk_msg(gspca_dev->dev,
110                                         urb->pipe,
111                                         data,
112                                         FPIX_MAX_TRANSFER,
113                                         &len, FPIX_TIMEOUT);
114                         if (ret < 0) {
115                                 /* Most of the time we get a timeout
116                                  * error. Just restart. */
117                                 goto again;
118                         }
119                         if (!gspca_dev->present || !gspca_dev->streaming)
120                                 goto out;
121                         frame = gspca_get_i_frame(&dev->gspca_dev);
122                         if (frame == NULL)
123                                 gspca_dev->last_packet_type = DISCARD_PACKET;
124
125                         if (len < FPIX_MAX_TRANSFER ||
126                                 (data[len - 2] == 0xff &&
127                                         data[len - 1] == 0xd9)) {
128
129                                 /* If the result is less than what was asked
130                                  * for, then it's the end of the
131                                  * frame. Sometimes the jpeg is not complete,
132                                  * but there's nothing we can do. We also end
133                                  * here if the the jpeg ends right at the end
134                                  * of the frame. */
135                                 if (frame)
136                                         frame = gspca_frame_add(gspca_dev,
137                                                         LAST_PACKET,
138                                                         frame,
139                                                         data, len);
140                                 break;
141                         }
142
143                         /* got a partial image */
144                         if (frame)
145                                 gspca_frame_add(gspca_dev,
146                                                 gspca_dev->last_packet_type
147                                                         == LAST_PACKET
148                                                 ? FIRST_PACKET : INTER_PACKET,
149                                                 frame, data, len);
150                 }
151
152                 /* We must wait before trying reading the next
153                  * frame. If we don't, or if the delay is too short,
154                  * the camera will disconnect. */
155                 msleep(NEXT_FRAME_DELAY);
156         }
157
158 out:
159         PDEBUG(D_STREAM, "dostream stopped");
160 }
161
162 /* this function is called at probe time */
163 static int sd_config(struct gspca_dev *gspca_dev,
164                 const struct usb_device_id *id)
165 {
166         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
167         struct cam *cam = &gspca_dev->cam;
168
169         cam->cam_mode = fpix_mode;
170         cam->nmodes = 1;
171         cam->bulk_size = FPIX_MAX_TRANSFER;
172
173         INIT_WORK(&dev->work_struct, dostream);
174
175         return 0;
176 }
177
178 /* this function is called at probe and resume time */
179 static int sd_init(struct gspca_dev *gspca_dev)
180 {
181         return 0;
182 }
183
184 /* start the camera */
185 static int sd_start(struct gspca_dev *gspca_dev)
186 {
187         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
188         int ret, len;
189
190         /* Init the device */
191         ret = command(gspca_dev, 0);
192         if (ret < 0) {
193                 PDEBUG(D_STREAM, "init failed %d", ret);
194                 return ret;
195         }
196
197         /* Read the result of the command. Ignore the result, for it
198          * varies with the device. */
199         ret = usb_bulk_msg(gspca_dev->dev,
200                         gspca_dev->urb[0]->pipe,
201                         gspca_dev->urb[0]->transfer_buffer,
202                         FPIX_MAX_TRANSFER, &len,
203                         FPIX_TIMEOUT);
204         if (ret < 0) {
205                 PDEBUG(D_STREAM, "usb_bulk_msg failed %d", ret);
206                 return ret;
207         }
208
209         /* Request a frame, but don't read it */
210         ret = command(gspca_dev, 1);
211         if (ret < 0) {
212                 PDEBUG(D_STREAM, "frame request failed %d", ret);
213                 return ret;
214         }
215
216         /* Again, reset bulk in endpoint */
217         usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);
218
219         /* Start the workqueue function to do the streaming */
220         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
221         queue_work(dev->work_thread, &dev->work_struct);
222
223         return 0;
224 }
225
226 /* called on streamoff with alt==0 and on disconnect */
227 /* the usb_lock is held at entry - restore on exit */
228 static void sd_stop0(struct gspca_dev *gspca_dev)
229 {
230         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
231
232         /* wait for the work queue to terminate */
233         mutex_unlock(&gspca_dev->usb_lock);
234         destroy_workqueue(dev->work_thread);
235         mutex_lock(&gspca_dev->usb_lock);
236         dev->work_thread = NULL;
237 }
238
239 /* Table of supported USB devices */
240 static const __devinitdata struct usb_device_id device_table[] = {
241         {USB_DEVICE(0x04cb, 0x0104)},
242         {USB_DEVICE(0x04cb, 0x0109)},
243         {USB_DEVICE(0x04cb, 0x010b)},
244         {USB_DEVICE(0x04cb, 0x010f)},
245         {USB_DEVICE(0x04cb, 0x0111)},
246         {USB_DEVICE(0x04cb, 0x0113)},
247         {USB_DEVICE(0x04cb, 0x0115)},
248         {USB_DEVICE(0x04cb, 0x0117)},
249         {USB_DEVICE(0x04cb, 0x0119)},
250         {USB_DEVICE(0x04cb, 0x011b)},
251         {USB_DEVICE(0x04cb, 0x011d)},
252         {USB_DEVICE(0x04cb, 0x0121)},
253         {USB_DEVICE(0x04cb, 0x0123)},
254         {USB_DEVICE(0x04cb, 0x0125)},
255         {USB_DEVICE(0x04cb, 0x0127)},
256         {USB_DEVICE(0x04cb, 0x0129)},
257         {USB_DEVICE(0x04cb, 0x012b)},
258         {USB_DEVICE(0x04cb, 0x012d)},
259         {USB_DEVICE(0x04cb, 0x012f)},
260         {USB_DEVICE(0x04cb, 0x0131)},
261         {USB_DEVICE(0x04cb, 0x013b)},
262         {USB_DEVICE(0x04cb, 0x013d)},
263         {USB_DEVICE(0x04cb, 0x013f)},
264         {}
265 };
266
267 MODULE_DEVICE_TABLE(usb, device_table);
268
269 /* sub-driver description */
270 static const struct sd_desc sd_desc = {
271         .name   = MODULE_NAME,
272         .config = sd_config,
273         .init   = sd_init,
274         .start  = sd_start,
275         .stop0  = sd_stop0,
276 };
277
278 /* -- device connect -- */
279 static int sd_probe(struct usb_interface *intf,
280                 const struct usb_device_id *id)
281 {
282         return gspca_dev_probe(intf, id,
283                         &sd_desc,
284                         sizeof(struct usb_fpix),
285                         THIS_MODULE);
286 }
287
288 static struct usb_driver sd_driver = {
289         .name       = MODULE_NAME,
290         .id_table   = device_table,
291         .probe      = sd_probe,
292         .disconnect = gspca_disconnect,
293 #ifdef CONFIG_PM
294         .suspend = gspca_suspend,
295         .resume  = gspca_resume,
296 #endif
297 };
298
299 /* -- module insert / remove -- */
300 static int __init sd_mod_init(void)
301 {
302         int ret;
303
304         ret = usb_register(&sd_driver);
305         if (ret < 0)
306                 return ret;
307         PDEBUG(D_PROBE, "registered");
308         return 0;
309 }
310
311 static void __exit sd_mod_exit(void)
312 {
313         usb_deregister(&sd_driver);
314         PDEBUG(D_PROBE, "deregistered");
315 }
316
317 module_init(sd_mod_init);
318 module_exit(sd_mod_exit);