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);