kernel/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  * 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 "jl2005bcd"
  22
  23 #include <linux/workqueue.h>
  24 #include <linux/slab.h>
  25 #include "gspca.h"
  26
  27
  28 MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
  29 MODULE_DESCRIPTION("JL2005B/C/D USB Camera Driver");
  30 MODULE_LICENSE("GPL");
  31
  32 /* Default timeouts, in ms */
  33 #define JL2005C_CMD_TIMEOUT 500
  34 #define JL2005C_DATA_TIMEOUT 1000
  35
  36 /* Maximum transfer size to use. */
  37 #define JL2005C_MAX_TRANSFER 0x200
  38 #define FRAME_HEADER_LEN 16
  39
  40
  41 /* specific webcam descriptor */
  42 struct sd {
  43         struct gspca_dev gspca_dev;  /* !! must be the first item */
  44         unsigned char firmware_id[6];
  45         const struct v4l2_pix_format *cap_mode;
  46         /* Driver stuff */
  47         struct work_struct work_struct;
  48         struct workqueue_struct *work_thread;
  49         u8 frame_brightness;
  50         int block_size; /* block size of camera */
  51         int vga;        /* 1 if vga cam, 0 if cif cam */
  52 };
  53
  54
  55 /* Camera has two resolution settings. What they are depends on model. */
  56 static const struct v4l2_pix_format cif_mode[] = {
  57         {176, 144, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  58                 .bytesperline = 176,
  59                 .sizeimage = 176 * 144,
  60                 .colorspace = V4L2_COLORSPACE_SRGB,
  61                 .priv = 0},
  62         {352, 288, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  63                 .bytesperline = 352,
  64                 .sizeimage = 352 * 288,
  65                 .colorspace = V4L2_COLORSPACE_SRGB,
  66                 .priv = 0},
  67 };
  68
  69 static const struct v4l2_pix_format vga_mode[] = {
  70         {320, 240, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  71                 .bytesperline = 320,
  72                 .sizeimage = 320 * 240,
  73                 .colorspace = V4L2_COLORSPACE_SRGB,
  74                 .priv = 0},
  75         {640, 480, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  76                 .bytesperline = 640,
  77                 .sizeimage = 640 * 480,
  78                 .colorspace = V4L2_COLORSPACE_SRGB,
  79                 .priv = 0},
  80 };
  81
  82 /*
  83  * cam uses endpoint 0x03 to send commands, 0x84 for read commands,
  84  * and 0x82 for bulk data transfer.
  85  */
  86
  87 /* All commands are two bytes only */
  88 static int jl2005c_write2(struct gspca_dev *gspca_dev, unsigned char *command)
  89 {
  90         int retval;
  91
  92         memcpy(gspca_dev->usb_buf, command, 2);
  93         retval = usb_bulk_msg(gspca_dev->dev,
  94                         usb_sndbulkpipe(gspca_dev->dev, 3),
  95                         gspca_dev->usb_buf, 2, NULL, 500);
  96         if (retval < 0)
  97                 pr_err("command write [%02x] error %d\n",
  98                        gspca_dev->usb_buf[0], retval);
  99         return retval;
 100 }
 101
 102 /* Response to a command is one byte in usb_buf[0], only if requested. */
 103 static int jl2005c_read1(struct gspca_dev *gspca_dev)
 104 {
 105         int retval;
 106
 107         retval = usb_bulk_msg(gspca_dev->dev,
 108                                 usb_rcvbulkpipe(gspca_dev->dev, 0x84),
 109                                 gspca_dev->usb_buf, 1, NULL, 500);
 110         if (retval < 0)
 111                 pr_err("read command [0x%02x] error %d\n",
 112                        gspca_dev->usb_buf[0], retval);
 113         return retval;
 114 }
 115
 116 /* Response appears in gspca_dev->usb_buf[0] */
 117 static int jl2005c_read_reg(struct gspca_dev *gspca_dev, unsigned char reg)
 118 {
 119         int retval;
 120
 121         static u8 instruction[2] = {0x95, 0x00};
 122         /* put register to read in byte 1 */
 123         instruction[1] = reg;
 124         /* Send the read request */
 125         retval = jl2005c_write2(gspca_dev, instruction);
 126         if (retval < 0)
 127                 return retval;
 128         retval = jl2005c_read1(gspca_dev);
 129
 130         return retval;
 131 }
 132
 133 static int jl2005c_start_new_frame(struct gspca_dev *gspca_dev)
 134 {
 135         int i;
 136         int retval;
 137         int frame_brightness = 0;
 138
 139         static u8 instruction[2] = {0x7f, 0x01};
 140
 141         retval = jl2005c_write2(gspca_dev, instruction);
 142         if (retval < 0)
 143                 return retval;
 144
 145         i = 0;
 146         while (i < 20 && !frame_brightness) {
 147                 /* If we tried 20 times, give up. */
 148                 retval = jl2005c_read_reg(gspca_dev, 0x7e);
 149                 if (retval < 0)
 150                         return retval;
 151                 frame_brightness = gspca_dev->usb_buf[0];
 152                 retval = jl2005c_read_reg(gspca_dev, 0x7d);
 153                 if (retval < 0)
 154                         return retval;
 155                 i++;
 156         }
 157         PDEBUG(D_FRAM, "frame_brightness is 0x%02x", gspca_dev->usb_buf[0]);
 158         return retval;
 159 }
 160
 161 static int jl2005c_write_reg(struct gspca_dev *gspca_dev, unsigned char reg,
 162                                                     unsigned char value)
 163 {
 164         int retval;
 165         u8 instruction[2];
 166
 167         instruction[0] = reg;
 168         instruction[1] = value;
 169
 170         retval = jl2005c_write2(gspca_dev, instruction);
 171         if (retval < 0)
 172                         return retval;
 173
 174         return retval;
 175 }
 176
 177 static int jl2005c_get_firmware_id(struct gspca_dev *gspca_dev)
 178 {
 179         struct sd *sd = (struct sd *)gspca_dev;
 180         int i = 0;
 181         int retval = -1;
 182         unsigned char regs_to_read[] = {0x57, 0x02, 0x03, 0x5d, 0x5e, 0x5f};
 183
 184         PDEBUG(D_PROBE, "Running jl2005c_get_firmware_id");
 185         /* Read the first ID byte once for warmup */
 186         retval = jl2005c_read_reg(gspca_dev, regs_to_read[0]);
 187         PDEBUG(D_PROBE, "response is %02x", gspca_dev->usb_buf[0]);
 188         if (retval < 0)
 189                 return retval;
 190         /* Now actually get the ID string */
 191         for (i = 0; i < 6; i++) {
 192                 retval = jl2005c_read_reg(gspca_dev, regs_to_read[i]);
 193                 if (retval < 0)
 194                         return retval;
 195                 sd->firmware_id[i] = gspca_dev->usb_buf[0];
 196         }
 197         PDEBUG(D_PROBE, "firmware ID is %02x%02x%02x%02x%02x%02x",
 198                                                 sd->firmware_id[0],
 199                                                 sd->firmware_id[1],
 200                                                 sd->firmware_id[2],
 201                                                 sd->firmware_id[3],
 202                                                 sd->firmware_id[4],
 203                                                 sd->firmware_id[5]);
 204         return 0;
 205 }
 206
 207 static int jl2005c_stream_start_vga_lg
 208                     (struct gspca_dev *gspca_dev)
 209 {
 210         int i;
 211         int retval = -1;
 212         static u8 instruction[][2] = {
 213                 {0x05, 0x00},
 214                 {0x7c, 0x00},
 215                 {0x7d, 0x18},
 216                 {0x02, 0x00},
 217                 {0x01, 0x00},
 218                 {0x04, 0x52},
 219         };
 220
 221         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 222                 msleep(60);
 223                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 224                 if (retval < 0)
 225                         return retval;
 226         }
 227         msleep(60);
 228         return retval;
 229 }
 230
 231 static int jl2005c_stream_start_vga_small(struct gspca_dev *gspca_dev)
 232 {
 233         int i;
 234         int retval = -1;
 235         static u8 instruction[][2] = {
 236                 {0x06, 0x00},
 237                 {0x7c, 0x00},
 238                 {0x7d, 0x1a},
 239                 {0x02, 0x00},
 240                 {0x01, 0x00},
 241                 {0x04, 0x52},
 242         };
 243
 244         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 245                 msleep(60);
 246                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 247                 if (retval < 0)
 248                         return retval;
 249         }
 250         msleep(60);
 251         return retval;
 252 }
 253
 254 static int jl2005c_stream_start_cif_lg(struct gspca_dev *gspca_dev)
 255 {
 256         int i;
 257         int retval = -1;
 258         static u8 instruction[][2] = {
 259                 {0x05, 0x00},
 260                 {0x7c, 0x00},
 261                 {0x7d, 0x30},
 262                 {0x02, 0x00},
 263                 {0x01, 0x00},
 264                 {0x04, 0x42},
 265         };
 266
 267         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 268                 msleep(60);
 269                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 270                 if (retval < 0)
 271                         return retval;
 272         }
 273         msleep(60);
 274         return retval;
 275 }
 276
 277 static int jl2005c_stream_start_cif_small(struct gspca_dev *gspca_dev)
 278 {
 279         int i;
 280         int retval = -1;
 281         static u8 instruction[][2] = {
 282                 {0x06, 0x00},
 283                 {0x7c, 0x00},
 284                 {0x7d, 0x32},
 285                 {0x02, 0x00},
 286                 {0x01, 0x00},
 287                 {0x04, 0x42},
 288         };
 289
 290         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 291                 msleep(60);
 292                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 293                 if (retval < 0)
 294                         return retval;
 295         }
 296         msleep(60);
 297         return retval;
 298 }
 299
 300
 301 static int jl2005c_stop(struct gspca_dev *gspca_dev)
 302 {
 303         int retval;
 304
 305         retval = jl2005c_write_reg(gspca_dev, 0x07, 0x00);
 306         return retval;
 307 }
 308
 309 /*
 310  * This function is called as a workqueue function and runs whenever the camera
 311  * is streaming data. Because it is a workqueue function it is allowed to sleep
 312  * so we can use synchronous USB calls. To avoid possible collisions with other
 313  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 314  * performing USB operations using it. In practice we don't really need this
 315  * as the camera doesn't provide any controls.
 316  */
 317 static void jl2005c_dostream(struct work_struct *work)
 318 {
 319         struct sd *dev = container_of(work, struct sd, work_struct);
 320         struct gspca_dev *gspca_dev = &dev->gspca_dev;
 321         int bytes_left = 0; /* bytes remaining in current frame. */
 322         int data_len;   /* size to use for the next read. */
 323         int header_read = 0;
 324         unsigned char header_sig[2] = {0x4a, 0x4c};
 325         int act_len;
 326         int packet_type;
 327         int ret;
 328         u8 *buffer;
 329
 330         buffer = kmalloc(JL2005C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
 331         if (!buffer) {
 332                 pr_err("Couldn't allocate USB buffer\n");
 333                 goto quit_stream;
 334         }
 335
 336         while (gspca_dev->present && gspca_dev->streaming) {
 337 #ifdef CONFIG_PM
 338                 if (gspca_dev->frozen)
 339                         break;
 340 #endif
 341                 /* Check if this is a new frame. If so, start the frame first */
 342                 if (!header_read) {
 343                         mutex_lock(&gspca_dev->usb_lock);
 344                         ret = jl2005c_start_new_frame(gspca_dev);
 345                         mutex_unlock(&gspca_dev->usb_lock);
 346                         if (ret < 0)
 347                                 goto quit_stream;
 348                         ret = usb_bulk_msg(gspca_dev->dev,
 349                                 usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 350                                 buffer, JL2005C_MAX_TRANSFER, &act_len,
 351                                 JL2005C_DATA_TIMEOUT);
 352                         PDEBUG(D_PACK,
 353                                 "Got %d bytes out of %d for header",
 354                                         act_len, JL2005C_MAX_TRANSFER);
 355                         if (ret < 0 || act_len < JL2005C_MAX_TRANSFER)
 356                                 goto quit_stream;
 357                         /* Check whether we actually got the first blodk */
 358                         if (memcmp(header_sig, buffer, 2) != 0) {
 359                                 pr_err("First block is not the first block\n");
 360                                 goto quit_stream;
 361                         }
 362                         /* total size to fetch is byte 7, times blocksize
 363                          * of which we already got act_len */
 364                         bytes_left = buffer[0x07] * dev->block_size - act_len;
 365                         PDEBUG(D_PACK, "bytes_left = 0x%x", bytes_left);
 366                         /* We keep the header. It has other information, too.*/
 367                         packet_type = FIRST_PACKET;
 368                         gspca_frame_add(gspca_dev, packet_type,
 369                                         buffer, act_len);
 370                         header_read = 1;
 371                 }
 372                 while (bytes_left > 0 && gspca_dev->present) {
 373                         data_len = bytes_left > JL2005C_MAX_TRANSFER ?
 374                                 JL2005C_MAX_TRANSFER : bytes_left;
 375                         ret = usb_bulk_msg(gspca_dev->dev,
 376                                 usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 377                                 buffer, data_len, &act_len,
 378                                 JL2005C_DATA_TIMEOUT);
 379                         if (ret < 0 || act_len < data_len)
 380                                 goto quit_stream;
 381                         PDEBUG(D_PACK,
 382                                 "Got %d bytes out of %d for frame",
 383                                                 data_len, bytes_left);
 384                         bytes_left -= data_len;
 385                         if (bytes_left == 0) {
 386                                 packet_type = LAST_PACKET;
 387                                 header_read = 0;
 388                         } else
 389                                 packet_type = INTER_PACKET;
 390                         gspca_frame_add(gspca_dev, packet_type,
 391                                         buffer, data_len);
 392                 }
 393         }
 394 quit_stream:
 395         if (gspca_dev->present) {
 396                 mutex_lock(&gspca_dev->usb_lock);
 397                 jl2005c_stop(gspca_dev);
 398                 mutex_unlock(&gspca_dev->usb_lock);
 399         }
 400         kfree(buffer);
 401 }
 402
 403
 404
 405
 406 /* This function is called at probe time */
 407 static int sd_config(struct gspca_dev *gspca_dev,
 408                         const struct usb_device_id *id)
 409 {
 410         struct cam *cam;
 411         struct sd *sd = (struct sd *) gspca_dev;
 412
 413         cam = &gspca_dev->cam;
 414         /* We don't use the buffer gspca allocates so make it small. */
 415         cam->bulk_size = 64;
 416         cam->bulk = 1;
 417         /* For the rest, the camera needs to be detected */
 418         jl2005c_get_firmware_id(gspca_dev);
 419         /* Here are some known firmware IDs
 420          * First some JL2005B cameras
 421          * {0x41, 0x07, 0x04, 0x2c, 0xe8, 0xf2} Sakar KidzCam
 422          * {0x45, 0x02, 0x08, 0xb9, 0x00, 0xd2} No-name JL2005B
 423          * JL2005C cameras
 424          * {0x01, 0x0c, 0x16, 0x10, 0xf8, 0xc8} Argus DC-1512
 425          * {0x12, 0x04, 0x03, 0xc0, 0x00, 0xd8} ICarly
 426          * {0x86, 0x08, 0x05, 0x02, 0x00, 0xd4} Jazz
 427          *
 428          * Based upon this scanty evidence, we can detect a CIF camera by
 429          * testing byte 0 for 0x4x.
 430          */
 431         if ((sd->firmware_id[0] & 0xf0) == 0x40) {
 432                 cam->cam_mode   = cif_mode;
 433                 cam->nmodes     = ARRAY_SIZE(cif_mode);
 434                 sd->block_size  = 0x80;
 435         } else {
 436                 cam->cam_mode   = vga_mode;
 437                 cam->nmodes     = ARRAY_SIZE(vga_mode);
 438                 sd->block_size  = 0x200;
 439         }
 440
 441         INIT_WORK(&sd->work_struct, jl2005c_dostream);
 442
 443         return 0;
 444 }
 445
 446 /* this function is called at probe and resume time */
 447 static int sd_init(struct gspca_dev *gspca_dev)
 448 {
 449         return 0;
 450 }
 451
 452 static int sd_start(struct gspca_dev *gspca_dev)
 453 {
 454
 455         struct sd *sd = (struct sd *) gspca_dev;
 456         sd->cap_mode = gspca_dev->cam.cam_mode;
 457
 458         switch (gspca_dev->pixfmt.width) {
 459         case 640:
 460                 PDEBUG(D_STREAM, "Start streaming at vga resolution");
 461                 jl2005c_stream_start_vga_lg(gspca_dev);
 462                 break;
 463         case 320:
 464                 PDEBUG(D_STREAM, "Start streaming at qvga resolution");
 465                 jl2005c_stream_start_vga_small(gspca_dev);
 466                 break;
 467         case 352:
 468                 PDEBUG(D_STREAM, "Start streaming at cif resolution");
 469                 jl2005c_stream_start_cif_lg(gspca_dev);
 470                 break;
 471         case 176:
 472                 PDEBUG(D_STREAM, "Start streaming at qcif resolution");
 473                 jl2005c_stream_start_cif_small(gspca_dev);
 474                 break;
 475         default:
 476                 pr_err("Unknown resolution specified\n");
 477                 return -1;
 478         }
 479
 480         /* Start the workqueue function to do the streaming */
 481         sd->work_thread = create_singlethread_workqueue(MODULE_NAME);
 482         queue_work(sd->work_thread, &sd->work_struct);
 483
 484         return 0;
 485 }
 486
 487 /* called on streamoff with alt==0 and on disconnect */
 488 /* the usb_lock is held at entry - restore on exit */
 489 static void sd_stop0(struct gspca_dev *gspca_dev)
 490 {
 491         struct sd *dev = (struct sd *) gspca_dev;
 492
 493         /* wait for the work queue to terminate */
 494         mutex_unlock(&gspca_dev->usb_lock);
 495         /* This waits for sq905c_dostream to finish */
 496         destroy_workqueue(dev->work_thread);
 497         dev->work_thread = NULL;
 498         mutex_lock(&gspca_dev->usb_lock);
 499 }
 500
 501
 502
 503 /* sub-driver description */
 504 static const struct sd_desc sd_desc = {
 505         .name = MODULE_NAME,
 506         .config = sd_config,
 507         .init = sd_init,
 508         .start = sd_start,
 509         .stop0 = sd_stop0,
 510 };
 511
 512 /* -- module initialisation -- */
 513 static const struct usb_device_id device_table[] = {
 514         {USB_DEVICE(0x0979, 0x0227)},
 515         {}
 516 };
 517 MODULE_DEVICE_TABLE(usb, device_table);
 518
 519 /* -- device connect -- */
 520 static int sd_probe(struct usb_interface *intf,
 521                                 const struct usb_device_id *id)
 522 {
 523         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 524                                 THIS_MODULE);
 525 }
 526
 527 static struct usb_driver sd_driver = {
 528         .name = MODULE_NAME,
 529         .id_table = device_table,
 530         .probe = sd_probe,
 531         .disconnect = gspca_disconnect,
 532 #ifdef CONFIG_PM
 533         .suspend = gspca_suspend,
 534         .resume = gspca_resume,
 535         .reset_resume = gspca_resume,
 536 #endif
 537 };
 538
 539 module_usb_driver(sd_driver);