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

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