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
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #define MODULE_NAME "finepix"
  20
  21 #include "gspca.h"
  22
  23 MODULE_AUTHOR("Frank Zago <frank@zago.net>");
  24 MODULE_DESCRIPTION("Fujifilm FinePix USB V4L2 driver");
  25 MODULE_LICENSE("GPL");
  26
  27 /* Default timeout, in ms */
  28 #define FPIX_TIMEOUT 250
  29
  30 /* Maximum transfer size to use. The windows driver reads by chunks of
  31  * 0x2000 bytes, so do the same. Note: reading more seems to work
  32  * too. */
  33 #define FPIX_MAX_TRANSFER 0x2000
  34
  35 /* Structure to hold all of our device specific stuff */
  36 struct usb_fpix {
  37         struct gspca_dev gspca_dev;     /* !! must be the first item */
  38
  39         struct work_struct work_struct;
  40 };
  41
  42 /* Delay after which claim the next frame. If the delay is too small,
  43  * the camera will return old frames. On the 4800Z, 20ms is bad, 25ms
  44  * will fail every 4 or 5 frames, but 30ms is perfect. On the A210,
  45  * 30ms is bad while 35ms is perfect. */
  46 #define NEXT_FRAME_DELAY 35
  47
  48 /* These cameras only support 320x200. */
  49 static const struct v4l2_pix_format fpix_mode[1] = {
  50         { 320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
  51                 .bytesperline = 320,
  52                 .sizeimage = 320 * 240 * 3 / 8 + 590,
  53                 .colorspace = V4L2_COLORSPACE_SRGB,
  54                 .priv = 0}
  55 };
  56
  57 /* send a command to the webcam */
  58 static int command(struct gspca_dev *gspca_dev,
  59                 int order)      /* 0: reset, 1: frame request */
  60 {
  61         static u8 order_values[2][12] = {
  62                 {0xc6, 0, 0, 0, 0, 0, 0,    0, 0x20, 0, 0, 0},  /* reset */
  63                 {0xd3, 0, 0, 0, 0, 0, 0, 0x01,    0, 0, 0, 0},  /* fr req */
  64         };
  65
  66         memcpy(gspca_dev->usb_buf, order_values[order], 12);
  67         return usb_control_msg(gspca_dev->dev,
  68                         usb_sndctrlpipe(gspca_dev->dev, 0),
  69                         USB_REQ_GET_STATUS,
  70                         USB_DIR_OUT | USB_TYPE_CLASS |
  71                         USB_RECIP_INTERFACE, 0, 0, gspca_dev->usb_buf,
  72                         12, FPIX_TIMEOUT);
  73 }
  74
  75 /*
  76  * This function is called as a workqueue function and runs whenever the camera
  77  * is streaming data. Because it is a workqueue function it is allowed to sleep
  78  * so we can use synchronous USB calls. To avoid possible collisions with other
  79  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
  80  * performing USB operations using it. In practice we don't really need this
  81  * as the camera doesn't provide any controls.
  82  */
  83 static void dostream(struct work_struct *work)
  84 {
  85         struct usb_fpix *dev = container_of(work, struct usb_fpix, work_struct);
  86         struct gspca_dev *gspca_dev = &dev->gspca_dev;
  87         struct urb *urb = gspca_dev->urb[0];
  88         u8 *data = urb->transfer_buffer;
  89         int ret = 0;
  90         int len;
  91
  92         PDEBUG(D_STREAM, "dostream started");
  93
  94         /* loop reading a frame */
  95 again:
  96         while (gspca_dev->present && gspca_dev->streaming) {
  97 #ifdef CONFIG_PM
  98                 if (gspca_dev->frozen)
  99                         break;
 100 #endif
 101
 102                 /* request a frame */
 103                 mutex_lock(&gspca_dev->usb_lock);
 104                 ret = command(gspca_dev, 1);
 105                 mutex_unlock(&gspca_dev->usb_lock);
 106                 if (ret < 0)
 107                         break;
 108 #ifdef CONFIG_PM
 109                 if (gspca_dev->frozen)
 110                         break;
 111 #endif
 112                 if (!gspca_dev->present || !gspca_dev->streaming)
 113                         break;
 114
 115                 /* the frame comes in parts */
 116                 for (;;) {
 117                         ret = usb_bulk_msg(gspca_dev->dev,
 118                                         urb->pipe,
 119                                         data,
 120                                         FPIX_MAX_TRANSFER,
 121                                         &len, FPIX_TIMEOUT);
 122                         if (ret < 0) {
 123                                 /* Most of the time we get a timeout
 124                                  * error. Just restart. */
 125                                 goto again;
 126                         }
 127 #ifdef CONFIG_PM
 128                         if (gspca_dev->frozen)
 129                                 goto out;
 130 #endif
 131                         if (!gspca_dev->present || !gspca_dev->streaming)
 132                                 goto out;
 133                         if (len < FPIX_MAX_TRANSFER ||
 134                                 (data[len - 2] == 0xff &&
 135                                         data[len - 1] == 0xd9)) {
 136
 137                                 /* If the result is less than what was asked
 138                                  * for, then it's the end of the
 139                                  * frame. Sometimes the jpeg is not complete,
 140                                  * but there's nothing we can do. We also end
 141                                  * here if the the jpeg ends right at the end
 142                                  * of the frame. */
 143                                 gspca_frame_add(gspca_dev, LAST_PACKET,
 144                                                 data, len);
 145                                 break;
 146                         }
 147
 148                         /* got a partial image */
 149                         gspca_frame_add(gspca_dev,
 150                                         gspca_dev->last_packet_type
 151                                                 == LAST_PACKET
 152                                         ? FIRST_PACKET : INTER_PACKET,
 153                                         data, len);
 154                 }
 155
 156                 /* We must wait before trying reading the next
 157                  * frame. If we don't, or if the delay is too short,
 158                  * the camera will disconnect. */
 159                 msleep(NEXT_FRAME_DELAY);
 160         }
 161
 162 out:
 163         PDEBUG(D_STREAM, "dostream stopped");
 164 }
 165
 166 /* this function is called at probe time */
 167 static int sd_config(struct gspca_dev *gspca_dev,
 168                 const struct usb_device_id *id)
 169 {
 170         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 171         struct cam *cam = &gspca_dev->cam;
 172
 173         cam->cam_mode = fpix_mode;
 174         cam->nmodes = 1;
 175         cam->bulk = 1;
 176         cam->bulk_size = FPIX_MAX_TRANSFER;
 177
 178         INIT_WORK(&dev->work_struct, dostream);
 179
 180         return 0;
 181 }
 182
 183 /* this function is called at probe and resume time */
 184 static int sd_init(struct gspca_dev *gspca_dev)
 185 {
 186         return 0;
 187 }
 188
 189 /* start the camera */
 190 static int sd_start(struct gspca_dev *gspca_dev)
 191 {
 192         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 193         int ret, len;
 194
 195         /* Init the device */
 196         ret = command(gspca_dev, 0);
 197         if (ret < 0) {
 198                 pr_err("init failed %d\n", ret);
 199                 return ret;
 200         }
 201
 202         /* Read the result of the command. Ignore the result, for it
 203          * varies with the device. */
 204         ret = usb_bulk_msg(gspca_dev->dev,
 205                         gspca_dev->urb[0]->pipe,
 206                         gspca_dev->urb[0]->transfer_buffer,
 207                         FPIX_MAX_TRANSFER, &len,
 208                         FPIX_TIMEOUT);
 209         if (ret < 0) {
 210                 pr_err("usb_bulk_msg failed %d\n", ret);
 211                 return ret;
 212         }
 213
 214         /* Request a frame, but don't read it */
 215         ret = command(gspca_dev, 1);
 216         if (ret < 0) {
 217                 pr_err("frame request failed %d\n", ret);
 218                 return ret;
 219         }
 220
 221         /* Again, reset bulk in endpoint */
 222         usb_clear_halt(gspca_dev->dev, gspca_dev->urb[0]->pipe);
 223
 224         schedule_work(&dev->work_struct);
 225
 226         return 0;
 227 }
 228
 229 /* called on streamoff with alt==0 and on disconnect */
 230 /* the usb_lock is held at entry - restore on exit */
 231 static void sd_stop0(struct gspca_dev *gspca_dev)
 232 {
 233         struct usb_fpix *dev = (struct usb_fpix *) gspca_dev;
 234
 235         /* wait for the work queue to terminate */
 236         mutex_unlock(&gspca_dev->usb_lock);
 237         flush_work(&dev->work_struct);
 238         mutex_lock(&gspca_dev->usb_lock);
 239 }
 240
 241 /* Table of supported USB devices */
 242 static const struct usb_device_id device_table[] = {
 243         {USB_DEVICE(0x04cb, 0x0104)},
 244         {USB_DEVICE(0x04cb, 0x0109)},
 245         {USB_DEVICE(0x04cb, 0x010b)},
 246         {USB_DEVICE(0x04cb, 0x010f)},
 247         {USB_DEVICE(0x04cb, 0x0111)},
 248         {USB_DEVICE(0x04cb, 0x0113)},
 249         {USB_DEVICE(0x04cb, 0x0115)},
 250         {USB_DEVICE(0x04cb, 0x0117)},
 251         {USB_DEVICE(0x04cb, 0x0119)},
 252         {USB_DEVICE(0x04cb, 0x011b)},
 253         {USB_DEVICE(0x04cb, 0x011d)},
 254         {USB_DEVICE(0x04cb, 0x0121)},
 255         {USB_DEVICE(0x04cb, 0x0123)},
 256         {USB_DEVICE(0x04cb, 0x0125)},
 257         {USB_DEVICE(0x04cb, 0x0127)},
 258         {USB_DEVICE(0x04cb, 0x0129)},
 259         {USB_DEVICE(0x04cb, 0x012b)},
 260         {USB_DEVICE(0x04cb, 0x012d)},
 261         {USB_DEVICE(0x04cb, 0x012f)},
 262         {USB_DEVICE(0x04cb, 0x0131)},
 263         {USB_DEVICE(0x04cb, 0x013b)},
 264         {USB_DEVICE(0x04cb, 0x013d)},
 265         {USB_DEVICE(0x04cb, 0x013f)},
 266         {}
 267 };
 268
 269 MODULE_DEVICE_TABLE(usb, device_table);
 270
 271 /* sub-driver description */
 272 static const struct sd_desc sd_desc = {
 273         .name   = MODULE_NAME,
 274         .config = sd_config,
 275         .init   = sd_init,
 276         .start  = sd_start,
 277         .stop0  = sd_stop0,
 278 };
 279
 280 /* -- device connect -- */
 281 static int sd_probe(struct usb_interface *intf,
 282                 const struct usb_device_id *id)
 283 {
 284         return gspca_dev_probe(intf, id,
 285                         &sd_desc,
 286                         sizeof(struct usb_fpix),
 287                         THIS_MODULE);
 288 }
 289
 290 static struct usb_driver sd_driver = {
 291         .name       = MODULE_NAME,
 292         .id_table   = device_table,
 293         .probe      = sd_probe,
 294         .disconnect = gspca_disconnect,
 295 #ifdef CONFIG_PM
 296         .suspend = gspca_suspend,
 297         .resume  = gspca_resume,
 298         .reset_resume = gspca_resume,
 299 #endif
 300 };
 301
 302 module_usb_driver(sd_driver);