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

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