drivers/media/usb/gspca/jl2005bcd.c

   1 /*
   2  * Jeilin JL2005B/C/D library
   3  *
   4  * Copyright (C) 2011 Theodore Kilgore <kilgota@auburn.edu>
   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 MODULE_NAME "jl2005bcd"
  18
  19 #include <linux/workqueue.h>
  20 #include <linux/slab.h>
  21 #include "gspca.h"
  22
  23
  24 MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
  25 MODULE_DESCRIPTION("JL2005B/C/D USB Camera Driver");
  26 MODULE_LICENSE("GPL");
  27
  28 /* Default timeouts, in ms */
  29 #define JL2005C_CMD_TIMEOUT 500
  30 #define JL2005C_DATA_TIMEOUT 1000
  31
  32 /* Maximum transfer size to use. */
  33 #define JL2005C_MAX_TRANSFER 0x200
  34 #define FRAME_HEADER_LEN 16
  35
  36
  37 /* specific webcam descriptor */
  38 struct sd {
  39         struct gspca_dev gspca_dev;  /* !! must be the first item */
  40         unsigned char firmware_id[6];
  41         const struct v4l2_pix_format *cap_mode;
  42         /* Driver stuff */
  43         struct work_struct work_struct;
  44         u8 frame_brightness;
  45         int block_size; /* block size of camera */
  46         int vga;        /* 1 if vga cam, 0 if cif cam */
  47 };
  48
  49
  50 /* Camera has two resolution settings. What they are depends on model. */
  51 static const struct v4l2_pix_format cif_mode[] = {
  52         {176, 144, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  53                 .bytesperline = 176,
  54                 .sizeimage = 176 * 144,
  55                 .colorspace = V4L2_COLORSPACE_SRGB,
  56                 .priv = 0},
  57         {352, 288, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  58                 .bytesperline = 352,
  59                 .sizeimage = 352 * 288,
  60                 .colorspace = V4L2_COLORSPACE_SRGB,
  61                 .priv = 0},
  62 };
  63
  64 static const struct v4l2_pix_format vga_mode[] = {
  65         {320, 240, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  66                 .bytesperline = 320,
  67                 .sizeimage = 320 * 240,
  68                 .colorspace = V4L2_COLORSPACE_SRGB,
  69                 .priv = 0},
  70         {640, 480, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  71                 .bytesperline = 640,
  72                 .sizeimage = 640 * 480,
  73                 .colorspace = V4L2_COLORSPACE_SRGB,
  74                 .priv = 0},
  75 };
  76
  77 /*
  78  * cam uses endpoint 0x03 to send commands, 0x84 for read commands,
  79  * and 0x82 for bulk data transfer.
  80  */
  81
  82 /* All commands are two bytes only */
  83 static int jl2005c_write2(struct gspca_dev *gspca_dev, unsigned char *command)
  84 {
  85         int retval;
  86
  87         memcpy(gspca_dev->usb_buf, command, 2);
  88         retval = usb_bulk_msg(gspca_dev->dev,
  89                         usb_sndbulkpipe(gspca_dev->dev, 3),
  90                         gspca_dev->usb_buf, 2, NULL, 500);
  91         if (retval < 0)
  92                 pr_err("command write [%02x] error %d\n",
  93                        gspca_dev->usb_buf[0], retval);
  94         return retval;
  95 }
  96
  97 /* Response to a command is one byte in usb_buf[0], only if requested. */
  98 static int jl2005c_read1(struct gspca_dev *gspca_dev)
  99 {
 100         int retval;
 101
 102         retval = usb_bulk_msg(gspca_dev->dev,
 103                                 usb_rcvbulkpipe(gspca_dev->dev, 0x84),
 104                                 gspca_dev->usb_buf, 1, NULL, 500);
 105         if (retval < 0)
 106                 pr_err("read command [0x%02x] error %d\n",
 107                        gspca_dev->usb_buf[0], retval);
 108         return retval;
 109 }
 110
 111 /* Response appears in gspca_dev->usb_buf[0] */
 112 static int jl2005c_read_reg(struct gspca_dev *gspca_dev, unsigned char reg)
 113 {
 114         int retval;
 115
 116         static u8 instruction[2] = {0x95, 0x00};
 117         /* put register to read in byte 1 */
 118         instruction[1] = reg;
 119         /* Send the read request */
 120         retval = jl2005c_write2(gspca_dev, instruction);
 121         if (retval < 0)
 122                 return retval;
 123         retval = jl2005c_read1(gspca_dev);
 124
 125         return retval;
 126 }
 127
 128 static int jl2005c_start_new_frame(struct gspca_dev *gspca_dev)
 129 {
 130         int i;
 131         int retval;
 132         int frame_brightness = 0;
 133
 134         static u8 instruction[2] = {0x7f, 0x01};
 135
 136         retval = jl2005c_write2(gspca_dev, instruction);
 137         if (retval < 0)
 138                 return retval;
 139
 140         i = 0;
 141         while (i < 20 && !frame_brightness) {
 142                 /* If we tried 20 times, give up. */
 143                 retval = jl2005c_read_reg(gspca_dev, 0x7e);
 144                 if (retval < 0)
 145                         return retval;
 146                 frame_brightness = gspca_dev->usb_buf[0];
 147                 retval = jl2005c_read_reg(gspca_dev, 0x7d);
 148                 if (retval < 0)
 149                         return retval;
 150                 i++;
 151         }
 152         PDEBUG(D_FRAM, "frame_brightness is 0x%02x", gspca_dev->usb_buf[0]);
 153         return retval;
 154 }
 155
 156 static int jl2005c_write_reg(struct gspca_dev *gspca_dev, unsigned char reg,
 157                                                     unsigned char value)
 158 {
 159         int retval;
 160         u8 instruction[2];
 161
 162         instruction[0] = reg;
 163         instruction[1] = value;
 164
 165         retval = jl2005c_write2(gspca_dev, instruction);
 166         if (retval < 0)
 167                         return retval;
 168
 169         return retval;
 170 }
 171
 172 static int jl2005c_get_firmware_id(struct gspca_dev *gspca_dev)
 173 {
 174         struct sd *sd = (struct sd *)gspca_dev;
 175         int i = 0;
 176         int retval = -1;
 177         unsigned char regs_to_read[] = {0x57, 0x02, 0x03, 0x5d, 0x5e, 0x5f};
 178
 179         PDEBUG(D_PROBE, "Running jl2005c_get_firmware_id");
 180         /* Read the first ID byte once for warmup */
 181         retval = jl2005c_read_reg(gspca_dev, regs_to_read[0]);
 182         PDEBUG(D_PROBE, "response is %02x", gspca_dev->usb_buf[0]);
 183         if (retval < 0)
 184                 return retval;
 185         /* Now actually get the ID string */
 186         for (i = 0; i < 6; i++) {
 187                 retval = jl2005c_read_reg(gspca_dev, regs_to_read[i]);
 188                 if (retval < 0)
 189                         return retval;
 190                 sd->firmware_id[i] = gspca_dev->usb_buf[0];
 191         }
 192         PDEBUG(D_PROBE, "firmware ID is %02x%02x%02x%02x%02x%02x",
 193                                                 sd->firmware_id[0],
 194                                                 sd->firmware_id[1],
 195                                                 sd->firmware_id[2],
 196                                                 sd->firmware_id[3],
 197                                                 sd->firmware_id[4],
 198                                                 sd->firmware_id[5]);
 199         return 0;
 200 }
 201
 202 static int jl2005c_stream_start_vga_lg
 203                     (struct gspca_dev *gspca_dev)
 204 {
 205         int i;
 206         int retval = -1;
 207         static u8 instruction[][2] = {
 208                 {0x05, 0x00},
 209                 {0x7c, 0x00},
 210                 {0x7d, 0x18},
 211                 {0x02, 0x00},
 212                 {0x01, 0x00},
 213                 {0x04, 0x52},
 214         };
 215
 216         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 217                 msleep(60);
 218                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 219                 if (retval < 0)
 220                         return retval;
 221         }
 222         msleep(60);
 223         return retval;
 224 }
 225
 226 static int jl2005c_stream_start_vga_small(struct gspca_dev *gspca_dev)
 227 {
 228         int i;
 229         int retval = -1;
 230         static u8 instruction[][2] = {
 231                 {0x06, 0x00},
 232                 {0x7c, 0x00},
 233                 {0x7d, 0x1a},
 234                 {0x02, 0x00},
 235                 {0x01, 0x00},
 236                 {0x04, 0x52},
 237         };
 238
 239         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 240                 msleep(60);
 241                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 242                 if (retval < 0)
 243                         return retval;
 244         }
 245         msleep(60);
 246         return retval;
 247 }
 248
 249 static int jl2005c_stream_start_cif_lg(struct gspca_dev *gspca_dev)
 250 {
 251         int i;
 252         int retval = -1;
 253         static u8 instruction[][2] = {
 254                 {0x05, 0x00},
 255                 {0x7c, 0x00},
 256                 {0x7d, 0x30},
 257                 {0x02, 0x00},
 258                 {0x01, 0x00},
 259                 {0x04, 0x42},
 260         };
 261
 262         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 263                 msleep(60);
 264                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 265                 if (retval < 0)
 266                         return retval;
 267         }
 268         msleep(60);
 269         return retval;
 270 }
 271
 272 static int jl2005c_stream_start_cif_small(struct gspca_dev *gspca_dev)
 273 {
 274         int i;
 275         int retval = -1;
 276         static u8 instruction[][2] = {
 277                 {0x06, 0x00},
 278                 {0x7c, 0x00},
 279                 {0x7d, 0x32},
 280                 {0x02, 0x00},
 281                 {0x01, 0x00},
 282                 {0x04, 0x42},
 283         };
 284
 285         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 286                 msleep(60);
 287                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 288                 if (retval < 0)
 289                         return retval;
 290         }
 291         msleep(60);
 292         return retval;
 293 }
 294
 295
 296 static int jl2005c_stop(struct gspca_dev *gspca_dev)
 297 {
 298         return jl2005c_write_reg(gspca_dev, 0x07, 0x00);
 299 }
 300
 301 /*
 302  * This function is called as a workqueue function and runs whenever the camera
 303  * is streaming data. Because it is a workqueue function it is allowed to sleep
 304  * so we can use synchronous USB calls. To avoid possible collisions with other
 305  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 306  * performing USB operations using it. In practice we don't really need this
 307  * as the camera doesn't provide any controls.
 308  */
 309 static void jl2005c_dostream(struct work_struct *work)
 310 {
 311         struct sd *dev = container_of(work, struct sd, work_struct);
 312         struct gspca_dev *gspca_dev = &dev->gspca_dev;
 313         int bytes_left = 0; /* bytes remaining in current frame. */
 314         int data_len;   /* size to use for the next read. */
 315         int header_read = 0;
 316         unsigned char header_sig[2] = {0x4a, 0x4c};
 317         int act_len;
 318         int packet_type;
 319         int ret;
 320         u8 *buffer;
 321
 322         buffer = kmalloc(JL2005C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
 323         if (!buffer) {
 324                 pr_err("Couldn't allocate USB buffer\n");
 325                 goto quit_stream;
 326         }
 327
 328         while (gspca_dev->present && gspca_dev->streaming) {
 329 #ifdef CONFIG_PM
 330                 if (gspca_dev->frozen)
 331                         break;
 332 #endif
 333                 /* Check if this is a new frame. If so, start the frame first */
 334                 if (!header_read) {
 335                         mutex_lock(&gspca_dev->usb_lock);
 336                         ret = jl2005c_start_new_frame(gspca_dev);
 337                         mutex_unlock(&gspca_dev->usb_lock);
 338                         if (ret < 0)
 339                                 goto quit_stream;
 340                         ret = usb_bulk_msg(gspca_dev->dev,
 341                                 usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 342                                 buffer, JL2005C_MAX_TRANSFER, &act_len,
 343                                 JL2005C_DATA_TIMEOUT);
 344                         PDEBUG(D_PACK,
 345                                 "Got %d bytes out of %d for header",
 346                                         act_len, JL2005C_MAX_TRANSFER);
 347                         if (ret < 0 || act_len < JL2005C_MAX_TRANSFER)
 348                                 goto quit_stream;
 349                         /* Check whether we actually got the first blodk */
 350                         if (memcmp(header_sig, buffer, 2) != 0) {
 351                                 pr_err("First block is not the first block\n");
 352                                 goto quit_stream;
 353                         }
 354                         /* total size to fetch is byte 7, times blocksize
 355                          * of which we already got act_len */
 356                         bytes_left = buffer[0x07] * dev->block_size - act_len;
 357                         PDEBUG(D_PACK, "bytes_left = 0x%x", bytes_left);
 358                         /* We keep the header. It has other information, too.*/
 359                         packet_type = FIRST_PACKET;
 360                         gspca_frame_add(gspca_dev, packet_type,
 361                                         buffer, act_len);
 362                         header_read = 1;
 363                 }
 364                 while (bytes_left > 0 && gspca_dev->present) {
 365                         data_len = bytes_left > JL2005C_MAX_TRANSFER ?
 366                                 JL2005C_MAX_TRANSFER : bytes_left;
 367                         ret = usb_bulk_msg(gspca_dev->dev,
 368                                 usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 369                                 buffer, data_len, &act_len,
 370                                 JL2005C_DATA_TIMEOUT);
 371                         if (ret < 0 || act_len < data_len)
 372                                 goto quit_stream;
 373                         PDEBUG(D_PACK,
 374                                 "Got %d bytes out of %d for frame",
 375                                                 data_len, bytes_left);
 376                         bytes_left -= data_len;
 377                         if (bytes_left == 0) {
 378                                 packet_type = LAST_PACKET;
 379                                 header_read = 0;
 380                         } else
 381                                 packet_type = INTER_PACKET;
 382                         gspca_frame_add(gspca_dev, packet_type,
 383                                         buffer, data_len);
 384                 }
 385         }
 386 quit_stream:
 387         if (gspca_dev->present) {
 388                 mutex_lock(&gspca_dev->usb_lock);
 389                 jl2005c_stop(gspca_dev);
 390                 mutex_unlock(&gspca_dev->usb_lock);
 391         }
 392         kfree(buffer);
 393 }
 394
 395
 396
 397
 398 /* This function is called at probe time */
 399 static int sd_config(struct gspca_dev *gspca_dev,
 400                         const struct usb_device_id *id)
 401 {
 402         struct cam *cam;
 403         struct sd *sd = (struct sd *) gspca_dev;
 404
 405         cam = &gspca_dev->cam;
 406         /* We don't use the buffer gspca allocates so make it small. */
 407         cam->bulk_size = 64;
 408         cam->bulk = 1;
 409         /* For the rest, the camera needs to be detected */
 410         jl2005c_get_firmware_id(gspca_dev);
 411         /* Here are some known firmware IDs
 412          * First some JL2005B cameras
 413          * {0x41, 0x07, 0x04, 0x2c, 0xe8, 0xf2} Sakar KidzCam
 414          * {0x45, 0x02, 0x08, 0xb9, 0x00, 0xd2} No-name JL2005B
 415          * JL2005C cameras
 416          * {0x01, 0x0c, 0x16, 0x10, 0xf8, 0xc8} Argus DC-1512
 417          * {0x12, 0x04, 0x03, 0xc0, 0x00, 0xd8} ICarly
 418          * {0x86, 0x08, 0x05, 0x02, 0x00, 0xd4} Jazz
 419          *
 420          * Based upon this scanty evidence, we can detect a CIF camera by
 421          * testing byte 0 for 0x4x.
 422          */
 423         if ((sd->firmware_id[0] & 0xf0) == 0x40) {
 424                 cam->cam_mode   = cif_mode;
 425                 cam->nmodes     = ARRAY_SIZE(cif_mode);
 426                 sd->block_size  = 0x80;
 427         } else {
 428                 cam->cam_mode   = vga_mode;
 429                 cam->nmodes     = ARRAY_SIZE(vga_mode);
 430                 sd->block_size  = 0x200;
 431         }
 432
 433         INIT_WORK(&sd->work_struct, jl2005c_dostream);
 434
 435         return 0;
 436 }
 437
 438 /* this function is called at probe and resume time */
 439 static int sd_init(struct gspca_dev *gspca_dev)
 440 {
 441         return 0;
 442 }
 443
 444 static int sd_start(struct gspca_dev *gspca_dev)
 445 {
 446
 447         struct sd *sd = (struct sd *) gspca_dev;
 448         sd->cap_mode = gspca_dev->cam.cam_mode;
 449
 450         switch (gspca_dev->pixfmt.width) {
 451         case 640:
 452                 PDEBUG(D_STREAM, "Start streaming at vga resolution");
 453                 jl2005c_stream_start_vga_lg(gspca_dev);
 454                 break;
 455         case 320:
 456                 PDEBUG(D_STREAM, "Start streaming at qvga resolution");
 457                 jl2005c_stream_start_vga_small(gspca_dev);
 458                 break;
 459         case 352:
 460                 PDEBUG(D_STREAM, "Start streaming at cif resolution");
 461                 jl2005c_stream_start_cif_lg(gspca_dev);
 462                 break;
 463         case 176:
 464                 PDEBUG(D_STREAM, "Start streaming at qcif resolution");
 465                 jl2005c_stream_start_cif_small(gspca_dev);
 466                 break;
 467         default:
 468                 pr_err("Unknown resolution specified\n");
 469                 return -1;
 470         }
 471
 472         schedule_work(&sd->work_struct);
 473
 474         return 0;
 475 }
 476
 477 /* called on streamoff with alt==0 and on disconnect */
 478 /* the usb_lock is held at entry - restore on exit */
 479 static void sd_stop0(struct gspca_dev *gspca_dev)
 480 {
 481         struct sd *dev = (struct sd *) gspca_dev;
 482
 483         /* wait for the work queue to terminate */
 484         mutex_unlock(&gspca_dev->usb_lock);
 485         /* This waits for sq905c_dostream to finish */
 486         flush_work(&dev->work_struct);
 487         mutex_lock(&gspca_dev->usb_lock);
 488 }
 489
 490
 491
 492 /* sub-driver description */
 493 static const struct sd_desc sd_desc = {
 494         .name = MODULE_NAME,
 495         .config = sd_config,
 496         .init = sd_init,
 497         .start = sd_start,
 498         .stop0 = sd_stop0,
 499 };
 500
 501 /* -- module initialisation -- */
 502 static const struct usb_device_id device_table[] = {
 503         {USB_DEVICE(0x0979, 0x0227)},
 504         {}
 505 };
 506 MODULE_DEVICE_TABLE(usb, device_table);
 507
 508 /* -- device connect -- */
 509 static int sd_probe(struct usb_interface *intf,
 510                                 const struct usb_device_id *id)
 511 {
 512         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 513                                 THIS_MODULE);
 514 }
 515
 516 static struct usb_driver sd_driver = {
 517         .name = MODULE_NAME,
 518         .id_table = device_table,
 519         .probe = sd_probe,
 520         .disconnect = gspca_disconnect,
 521 #ifdef CONFIG_PM
 522         .suspend = gspca_suspend,
 523         .resume = gspca_resume,
 524         .reset_resume = gspca_resume,
 525 #endif
 526 };
 527
 528 module_usb_driver(sd_driver);