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 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 /* workqueue */
  81 static void dostream(struct work_struct *work)
  82 {
  83         struct usb_fpix *dev = container_of(work, struct usb_fpix, work_struct);
  84         struct gspca_dev *gspca_dev = &dev->gspca_dev;
  85         struct urb *urb = gspca_dev->urb[0];
  86         u8 *data = urb->transfer_buffer;
  87         int ret = 0;
  88         int len;
  89
  90         /* synchronize with the main driver */
  91         mutex_lock(&gspca_dev->usb_lock);
  92         mutex_unlock(&gspca_dev->usb_lock);
  93         PDEBUG(D_STREAM, "dostream started");
  94
  95         /* loop reading a frame */
  96 again:
  97         while (gspca_dev->present && gspca_dev->streaming) {
  98
  99                 /* request a frame */
 100                 mutex_lock(&gspca_dev->usb_lock);
 101                 ret = command(gspca_dev, 1);
 102                 mutex_unlock(&gspca_dev->usb_lock);
 103                 if (ret < 0)
 104                         break;
 105                 if (!gspca_dev->present || !gspca_dev->streaming)
 106                         break;
 107
 108                 /* the frame comes in parts */
 109                 for (;;) {
 110                         ret = usb_bulk_msg(gspca_dev->dev,
 111                                         urb->pipe,
 112                                         data,
 113                                         FPIX_MAX_TRANSFER,
 114                                         &len, FPIX_TIMEOUT);
 115                         if (ret < 0) {
 116                                 /* Most of the time we get a timeout
 117                                  * error. Just restart. */
 118                                 goto again;
 119                         }
 120                         if (!gspca_dev->present || !gspca_dev->streaming)
 121                                 goto out;
 122                         if (len < FPIX_MAX_TRANSFER ||
 123                                 (data[len - 2] == 0xff &&
 124                                         data[len - 1] == 0xd9)) {
 125
 126                                 /* If the result is less than what was asked
 127                                  * for, then it's the end of the
 128                                  * frame. Sometimes the jpeg is not complete,
 129                                  * but there's nothing we can do. We also end
 130                                  * here if the the jpeg ends right at the end
 131                                  * of the frame. */
 132                                 gspca_frame_add(gspca_dev, LAST_PACKET,
 133                                                 data, len);
 134                                 break;
 135                         }
 136
 137                         /* got a partial image */
 138                         gspca_frame_add(gspca_dev,
 139                                         gspca_dev->last_packet_type
 140                                                 == LAST_PACKET
 141                                         ? FIRST_PACKET : INTER_PACKET,
 142                                         data, len);
 143                 }
 144
 145                 /* We must wait before trying reading the next
 146                  * frame. If we don't, or if the delay is too short,
 147                  * the camera will disconnect. */
 148                 msleep(NEXT_FRAME_DELAY);
 149         }
 150
 151 out:
 152         PDEBUG(D_STREAM, "dostream stopped");
 153 }
 154
 155 /* this function is called at probe time */
 156 static int sd_config(struct gspca_dev *gspca_dev,
 157                 const struct usb_device_id *id)
 158 {
 159         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 160         struct cam *cam = &gspca_dev->cam;
 161
 162         cam->cam_mode = fpix_mode;
 163         cam->nmodes = 1;
 164         cam->bulk = 1;
 165         cam->bulk_size = FPIX_MAX_TRANSFER;
 166
 167         INIT_WORK(&dev->work_struct, dostream);
 168
 169         return 0;
 170 }
 171
 172 /* this function is called at probe and resume time */
 173 static int sd_init(struct gspca_dev *gspca_dev)
 174 {
 175         return 0;
 176 }
 177
 178 /* start the camera */
 179 static int sd_start(struct gspca_dev *gspca_dev)
 180 {
 181         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 182         int ret, len;
 183
 184         /* Init the device */
 185         ret = command(gspca_dev, 0);
 186         if (ret < 0) {
 187                 pr_err("init failed %d\n", ret);
 188                 return ret;
 189         }
 190
 191         /* Read the result of the command. Ignore the result, for it
 192          * varies with the device. */
 193         ret = usb_bulk_msg(gspca_dev->dev,
 194                         gspca_dev->urb[0]->pipe,
 195                         gspca_dev->urb[0]->transfer_buffer,
 196                         FPIX_MAX_TRANSFER, &len,
 197                         FPIX_TIMEOUT);
 198         if (ret < 0) {
 199                 pr_err("usb_bulk_msg failed %d\n", ret);
 200                 return ret;
 201         }
 202
 203         /* Request a frame, but don't read it */
 204         ret = command(gspca_dev, 1);
 205         if (ret < 0) {
 206                 pr_err("frame request failed %d\n", ret);
 207                 return ret;
 208         }
 209
 210         /* Again, reset bulk in endpoint */
 211         usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);
 212
 213         /* Start the workqueue function to do the streaming */
 214         dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
 215         queue_work(dev->work_thread, &dev->work_struct);
 216
 217         return 0;
 218 }
 219
 220 /* called on streamoff with alt==0 and on disconnect */
 221 /* the usb_lock is held at entry - restore on exit */
 222 static void sd_stop0(struct gspca_dev *gspca_dev)
 223 {
 224         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 225
 226         /* wait for the work queue to terminate */
 227         mutex_unlock(&gspca_dev->usb_lock);
 228         destroy_workqueue(dev->work_thread);
 229         mutex_lock(&gspca_dev->usb_lock);
 230         dev->work_thread = NULL;
 231 }
 232
 233 /* Table of supported USB devices */
 234 static const struct usb_device_id device_table[] = {
 235         {USB_DEVICE(0x04cb, 0x0104)},
 236         {USB_DEVICE(0x04cb, 0x0109)},
 237         {USB_DEVICE(0x04cb, 0x010b)},
 238         {USB_DEVICE(0x04cb, 0x010f)},
 239         {USB_DEVICE(0x04cb, 0x0111)},
 240         {USB_DEVICE(0x04cb, 0x0113)},
 241         {USB_DEVICE(0x04cb, 0x0115)},
 242         {USB_DEVICE(0x04cb, 0x0117)},
 243         {USB_DEVICE(0x04cb, 0x0119)},
 244         {USB_DEVICE(0x04cb, 0x011b)},
 245         {USB_DEVICE(0x04cb, 0x011d)},
 246         {USB_DEVICE(0x04cb, 0x0121)},
 247         {USB_DEVICE(0x04cb, 0x0123)},
 248         {USB_DEVICE(0x04cb, 0x0125)},
 249         {USB_DEVICE(0x04cb, 0x0127)},
 250         {USB_DEVICE(0x04cb, 0x0129)},
 251         {USB_DEVICE(0x04cb, 0x012b)},
 252         {USB_DEVICE(0x04cb, 0x012d)},
 253         {USB_DEVICE(0x04cb, 0x012f)},
 254         {USB_DEVICE(0x04cb, 0x0131)},
 255         {USB_DEVICE(0x04cb, 0x013b)},
 256         {USB_DEVICE(0x04cb, 0x013d)},
 257         {USB_DEVICE(0x04cb, 0x013f)},
 258         {}
 259 };
 260
 261 MODULE_DEVICE_TABLE(usb, device_table);
 262
 263 /* sub-driver description */
 264 static const struct sd_desc sd_desc = {
 265         .name   = MODULE_NAME,
 266         .config = sd_config,
 267         .init   = sd_init,
 268         .start  = sd_start,
 269         .stop0  = sd_stop0,
 270 };
 271
 272 /* -- device connect -- */
 273 static int sd_probe(struct usb_interface *intf,
 274                 const struct usb_device_id *id)
 275 {
 276         return gspca_dev_probe(intf, id,
 277                         &sd_desc,
 278                         sizeof(struct usb_fpix),
 279                         THIS_MODULE);
 280 }
 281
 282 static struct usb_driver sd_driver = {
 283         .name       = MODULE_NAME,
 284         .id_table   = device_table,
 285         .probe      = sd_probe,
 286         .disconnect = gspca_disconnect,
 287 #ifdef CONFIG_PM
 288         .suspend = gspca_suspend,
 289         .resume  = gspca_resume,
 290 #endif
 291 };
 292
 293 /* -- module insert / remove -- */
 294 static int __init sd_mod_init(void)
 295 {
 296         return usb_register(&sd_driver);
 297 }
 298
 299 static void __exit sd_mod_exit(void)
 300 {
 301         usb_deregister(&sd_driver);
 302 }
 303
 304 module_init(sd_mod_init);
 305 module_exit(sd_mod_exit);