release/src-rt-6.x.4708/linux/linux-2.6.36/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         int ret = 0;
  86         int len;
  87
  88         /* synchronize with the main driver */
  89         mutex_lock(&gspca_dev->usb_lock);
  90         mutex_unlock(&gspca_dev->usb_lock);
  91         PDEBUG(D_STREAM, "dostream started");
  92
  93         /* loop reading a frame */
  94 again:
  95         while (gspca_dev->present && gspca_dev->streaming) {
  96
  97                 /* request a frame */
  98                 mutex_lock(&gspca_dev->usb_lock);
  99                 ret = command(gspca_dev, 1);
 100                 mutex_unlock(&gspca_dev->usb_lock);
 101                 if (ret < 0)
 102                         break;
 103                 if (!gspca_dev->present || !gspca_dev->streaming)
 104                         break;
 105
 106                 /* the frame comes in parts */
 107                 for (;;) {
 108                         ret = usb_bulk_msg(gspca_dev->dev,
 109                                         urb->pipe,
 110                                         data,
 111                                         FPIX_MAX_TRANSFER,
 112                                         &len, FPIX_TIMEOUT);
 113                         if (ret < 0) {
 114                                 /* Most of the time we get a timeout
 115                                  * error. Just restart. */
 116                                 goto again;
 117                         }
 118                         if (!gspca_dev->present || !gspca_dev->streaming)
 119                                 goto out;
 120                         if (len < FPIX_MAX_TRANSFER ||
 121                                 (data[len - 2] == 0xff &&
 122                                         data[len - 1] == 0xd9)) {
 123
 124                                 /* If the result is less than what was asked
 125                                  * for, then it's the end of the
 126                                  * frame. Sometimes the jpeg is not complete,
 127                                  * but there's nothing we can do. We also end
 128                                  * here if the the jpeg ends right at the end
 129                                  * of the frame. */
 130                                 gspca_frame_add(gspca_dev, LAST_PACKET,
 131                                                 data, len);
 132                                 break;
 133                         }
 134
 135                         /* got a partial image */
 136                         gspca_frame_add(gspca_dev,
 137                                         gspca_dev->last_packet_type
 138                                                 == LAST_PACKET
 139                                         ? FIRST_PACKET : INTER_PACKET,
 140                                         data, len);
 141                 }
 142
 143                 /* We must wait before trying reading the next
 144                  * frame. If we don't, or if the delay is too short,
 145                  * the camera will disconnect. */
 146                 msleep(NEXT_FRAME_DELAY);
 147         }
 148
 149 out:
 150         PDEBUG(D_STREAM, "dostream stopped");
 151 }
 152
 153 /* this function is called at probe time */
 154 static int sd_config(struct gspca_dev *gspca_dev,
 155                 const struct usb_device_id *id)
 156 {
 157         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 158         struct cam *cam = &gspca_dev->cam;
 159
 160         cam->cam_mode = fpix_mode;
 161         cam->nmodes = 1;
 162         cam->bulk = 1;
 163         cam->bulk_size = FPIX_MAX_TRANSFER;
 164
 165         INIT_WORK(&dev->work_struct, dostream);
 166
 167         return 0;
 168 }
 169
 170 /* this function is called at probe and resume time */
 171 static int sd_init(struct gspca_dev *gspca_dev)
 172 {
 173         return 0;
 174 }
 175
 176 /* start the camera */
 177 static int sd_start(struct gspca_dev *gspca_dev)
 178 {
 179         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 180         int ret, len;
 181
 182         /* Init the device */
 183         ret = command(gspca_dev, 0);
 184         if (ret < 0) {
 185                 PDEBUG(D_STREAM, "init failed %d", ret);
 186                 return ret;
 187         }
 188
 189         /* Read the result of the command. Ignore the result, for it
 190          * varies with the device. */
 191         ret = usb_bulk_msg(gspca_dev->dev,
 192                         gspca_dev->urb[0]->pipe,
 193                         gspca_dev->urb[0]->transfer_buffer,
 194                         FPIX_MAX_TRANSFER, &len,
 195                         FPIX_TIMEOUT);
 196         if (ret < 0) {
 197                 PDEBUG(D_STREAM, "usb_bulk_msg failed %d", ret);
 198                 return ret;
 199         }
 200
 201         /* Request a frame, but don't read it */
 202         ret = command(gspca_dev, 1);
 203         if (ret < 0) {
 204                 PDEBUG(D_STREAM, "frame request failed %d", ret);
 205                 return ret;
 206         }
 207
 208         /* Again, reset bulk in endpoint */
 209         usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);
 210
 211         /* Start the workqueue function to do the streaming */
 212         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
 213         queue_work(dev->work_thread, &dev->work_struct);
 214
 215         return 0;
 216 }
 217
 218 /* called on streamoff with alt==0 and on disconnect */
 219 /* the usb_lock is held at entry - restore on exit */
 220 static void sd_stop0(struct gspca_dev *gspca_dev)
 221 {
 222         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 223
 224         /* wait for the work queue to terminate */
 225         mutex_unlock(&gspca_dev->usb_lock);
 226         destroy_workqueue(dev->work_thread);
 227         mutex_lock(&gspca_dev->usb_lock);
 228         dev->work_thread = NULL;
 229 }
 230
 231 /* Table of supported USB devices */
 232 static const __devinitdata struct usb_device_id device_table[] = {
 233         {USB_DEVICE(0x04cb, 0x0104)},
 234         {USB_DEVICE(0x04cb, 0x0109)},
 235         {USB_DEVICE(0x04cb, 0x010b)},
 236         {USB_DEVICE(0x04cb, 0x010f)},
 237         {USB_DEVICE(0x04cb, 0x0111)},
 238         {USB_DEVICE(0x04cb, 0x0113)},
 239         {USB_DEVICE(0x04cb, 0x0115)},
 240         {USB_DEVICE(0x04cb, 0x0117)},
 241         {USB_DEVICE(0x04cb, 0x0119)},
 242         {USB_DEVICE(0x04cb, 0x011b)},
 243         {USB_DEVICE(0x04cb, 0x011d)},
 244         {USB_DEVICE(0x04cb, 0x0121)},
 245         {USB_DEVICE(0x04cb, 0x0123)},
 246         {USB_DEVICE(0x04cb, 0x0125)},
 247         {USB_DEVICE(0x04cb, 0x0127)},
 248         {USB_DEVICE(0x04cb, 0x0129)},
 249         {USB_DEVICE(0x04cb, 0x012b)},
 250         {USB_DEVICE(0x04cb, 0x012d)},
 251         {USB_DEVICE(0x04cb, 0x012f)},
 252         {USB_DEVICE(0x04cb, 0x0131)},
 253         {USB_DEVICE(0x04cb, 0x013b)},
 254         {USB_DEVICE(0x04cb, 0x013d)},
 255         {USB_DEVICE(0x04cb, 0x013f)},
 256         {}
 257 };
 258
 259 MODULE_DEVICE_TABLE(usb, device_table);
 260
 261 /* sub-driver description */
 262 static const struct sd_desc sd_desc = {
 263         .name   = MODULE_NAME,
 264         .config = sd_config,
 265         .init   = sd_init,
 266         .start  = sd_start,
 267         .stop0  = sd_stop0,
 268 };
 269
 270 /* -- device connect -- */
 271 static int sd_probe(struct usb_interface *intf,
 272                 const struct usb_device_id *id)
 273 {
 274         return gspca_dev_probe(intf, id,
 275                         &sd_desc,
 276                         sizeof(struct usb_fpix),
 277                         THIS_MODULE);
 278 }
 279
 280 static struct usb_driver sd_driver = {
 281         .name       = MODULE_NAME,
 282         .id_table   = device_table,
 283         .probe      = sd_probe,
 284         .disconnect = gspca_disconnect,
 285 #ifdef CONFIG_PM
 286         .suspend = gspca_suspend,
 287         .resume  = gspca_resume,
 288 #endif
 289 };
 290
 291 /* -- module insert / remove -- */
 292 static int __init sd_mod_init(void)
 293 {
 294         int ret;
 295
 296         ret = usb_register(&sd_driver);
 297         if (ret < 0)
 298                 return ret;
 299         PDEBUG(D_PROBE, "registered");
 300         return 0;
 301 }
 302
 303 static void __exit sd_mod_exit(void)
 304 {
 305         usb_deregister(&sd_driver);
 306         PDEBUG(D_PROBE, "deregistered");
 307 }
 308
 309 module_init(sd_mod_init);
 310 module_exit(sd_mod_exit);