drivers/media/usb/gspca/jl2005bcd.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
jl2005c_write2
jl2005c_read1
jl2005c_read_reg
jl2005c_start_new_frame
jl2005c_write_reg
jl2005c_get_firmware_id
jl2005c_stream_start_vga_small
jl2005c_stream_start_cif_lg
jl2005c_stream_start_cif_small
jl2005c_stop
jl2005c_dostream
sd_config
sd_init
sd_start
sd_stop0
sd_probe
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Jeilin JL2005B/C/D library
   4  *
   5  * Copyright (C) 2011 Theodore Kilgore <kilgota@auburn.edu>
   6  */
   7 
   8 #define MODULE_NAME "jl2005bcd"
   9 
  10 #include <linux/workqueue.h>
  11 #include <linux/slab.h>
  12 #include "gspca.h"
  13 
  14 
  15 MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
  16 MODULE_DESCRIPTION("JL2005B/C/D USB Camera Driver");
  17 MODULE_LICENSE("GPL");
  18 
  19 /* Default timeouts, in ms */
  20 #define JL2005C_CMD_TIMEOUT 500
  21 #define JL2005C_DATA_TIMEOUT 1000
  22 
  23 /* Maximum transfer size to use. */
  24 #define JL2005C_MAX_TRANSFER 0x200
  25 #define FRAME_HEADER_LEN 16
  26 
  27 
  28 /* specific webcam descriptor */
  29 struct sd {
  30         struct gspca_dev gspca_dev;  /* !! must be the first item */
  31         unsigned char firmware_id[6];
  32         const struct v4l2_pix_format *cap_mode;
  33         /* Driver stuff */
  34         struct work_struct work_struct;
  35         u8 frame_brightness;
  36         int block_size; /* block size of camera */
  37         int vga;        /* 1 if vga cam, 0 if cif cam */
  38 };
  39 
  40 
  41 /* Camera has two resolution settings. What they are depends on model. */
  42 static const struct v4l2_pix_format cif_mode[] = {
  43         {176, 144, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  44                 .bytesperline = 176,
  45                 .sizeimage = 176 * 144,
  46                 .colorspace = V4L2_COLORSPACE_SRGB,
  47                 .priv = 0},
  48         {352, 288, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  49                 .bytesperline = 352,
  50                 .sizeimage = 352 * 288,
  51                 .colorspace = V4L2_COLORSPACE_SRGB,
  52                 .priv = 0},
  53 };
  54 
  55 static const struct v4l2_pix_format vga_mode[] = {
  56         {320, 240, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  57                 .bytesperline = 320,
  58                 .sizeimage = 320 * 240,
  59                 .colorspace = V4L2_COLORSPACE_SRGB,
  60                 .priv = 0},
  61         {640, 480, V4L2_PIX_FMT_JL2005BCD, V4L2_FIELD_NONE,
  62                 .bytesperline = 640,
  63                 .sizeimage = 640 * 480,
  64                 .colorspace = V4L2_COLORSPACE_SRGB,
  65                 .priv = 0},
  66 };
  67 
  68 /*
  69  * cam uses endpoint 0x03 to send commands, 0x84 for read commands,
  70  * and 0x82 for bulk data transfer.
  71  */
  72 
  73 /* All commands are two bytes only */
  74 static int jl2005c_write2(struct gspca_dev *gspca_dev, unsigned char *command)
  75 {
  76         int retval;
  77 
  78         memcpy(gspca_dev->usb_buf, command, 2);
  79         retval = usb_bulk_msg(gspca_dev->dev,
  80                         usb_sndbulkpipe(gspca_dev->dev, 3),
  81                         gspca_dev->usb_buf, 2, NULL, 500);
  82         if (retval < 0)
  83                 pr_err("command write [%02x] error %d\n",
  84                        gspca_dev->usb_buf[0], retval);
  85         return retval;
  86 }
  87 
  88 /* Response to a command is one byte in usb_buf[0], only if requested. */
  89 static int jl2005c_read1(struct gspca_dev *gspca_dev)
  90 {
  91         int retval;
  92 
  93         retval = usb_bulk_msg(gspca_dev->dev,
  94                                 usb_rcvbulkpipe(gspca_dev->dev, 0x84),
  95                                 gspca_dev->usb_buf, 1, NULL, 500);
  96         if (retval < 0)
  97                 pr_err("read command [0x%02x] error %d\n",
  98                        gspca_dev->usb_buf[0], retval);
  99         return retval;
 100 }
 101 
 102 /* Response appears in gspca_dev->usb_buf[0] */
 103 static int jl2005c_read_reg(struct gspca_dev *gspca_dev, unsigned char reg)
 104 {
 105         int retval;
 106 
 107         static u8 instruction[2] = {0x95, 0x00};
 108         /* put register to read in byte 1 */
 109         instruction[1] = reg;
 110         /* Send the read request */
 111         retval = jl2005c_write2(gspca_dev, instruction);
 112         if (retval < 0)
 113                 return retval;
 114         retval = jl2005c_read1(gspca_dev);
 115 
 116         return retval;
 117 }
 118 
 119 static int jl2005c_start_new_frame(struct gspca_dev *gspca_dev)
 120 {
 121         int i;
 122         int retval;
 123         int frame_brightness = 0;
 124 
 125         static u8 instruction[2] = {0x7f, 0x01};
 126 
 127         retval = jl2005c_write2(gspca_dev, instruction);
 128         if (retval < 0)
 129                 return retval;
 130 
 131         i = 0;
 132         while (i < 20 && !frame_brightness) {
 133                 /* If we tried 20 times, give up. */
 134                 retval = jl2005c_read_reg(gspca_dev, 0x7e);
 135                 if (retval < 0)
 136                         return retval;
 137                 frame_brightness = gspca_dev->usb_buf[0];
 138                 retval = jl2005c_read_reg(gspca_dev, 0x7d);
 139                 if (retval < 0)
 140                         return retval;
 141                 i++;
 142         }
 143         gspca_dbg(gspca_dev, D_FRAM, "frame_brightness is 0x%02x\n",
 144                   gspca_dev->usb_buf[0]);
 145         return retval;
 146 }
 147 
 148 static int jl2005c_write_reg(struct gspca_dev *gspca_dev, unsigned char reg,
 149                                                     unsigned char value)
 150 {
 151         int retval;
 152         u8 instruction[2];
 153 
 154         instruction[0] = reg;
 155         instruction[1] = value;
 156 
 157         retval = jl2005c_write2(gspca_dev, instruction);
 158         if (retval < 0)
 159                         return retval;
 160 
 161         return retval;
 162 }
 163 
 164 static int jl2005c_get_firmware_id(struct gspca_dev *gspca_dev)
 165 {
 166         struct sd *sd = (struct sd *)gspca_dev;
 167         int i = 0;
 168         int retval = -1;
 169         unsigned char regs_to_read[] = {0x57, 0x02, 0x03, 0x5d, 0x5e, 0x5f};
 170 
 171         gspca_dbg(gspca_dev, D_PROBE, "Running jl2005c_get_firmware_id\n");
 172         /* Read the first ID byte once for warmup */
 173         retval = jl2005c_read_reg(gspca_dev, regs_to_read[0]);
 174         gspca_dbg(gspca_dev, D_PROBE, "response is %02x\n",
 175                   gspca_dev->usb_buf[0]);
 176         if (retval < 0)
 177                 return retval;
 178         /* Now actually get the ID string */
 179         for (i = 0; i < 6; i++) {
 180                 retval = jl2005c_read_reg(gspca_dev, regs_to_read[i]);
 181                 if (retval < 0)
 182                         return retval;
 183                 sd->firmware_id[i] = gspca_dev->usb_buf[0];
 184         }
 185         gspca_dbg(gspca_dev, D_PROBE, "firmware ID is %02x%02x%02x%02x%02x%02x\n",
 186                   sd->firmware_id[0],
 187                   sd->firmware_id[1],
 188                   sd->firmware_id[2],
 189                   sd->firmware_id[3],
 190                   sd->firmware_id[4],
 191                   sd->firmware_id[5]);
 192         return 0;
 193 }
 194 
 195 static int jl2005c_stream_start_vga_lg
 196                     (struct gspca_dev *gspca_dev)
 197 {
 198         int i;
 199         int retval = -1;
 200         static u8 instruction[][2] = {
 201                 {0x05, 0x00},
 202                 {0x7c, 0x00},
 203                 {0x7d, 0x18},
 204                 {0x02, 0x00},
 205                 {0x01, 0x00},
 206                 {0x04, 0x52},
 207         };
 208 
 209         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 210                 msleep(60);
 211                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 212                 if (retval < 0)
 213                         return retval;
 214         }
 215         msleep(60);
 216         return retval;
 217 }
 218 
 219 static int jl2005c_stream_start_vga_small(struct gspca_dev *gspca_dev)
 220 {
 221         int i;
 222         int retval = -1;
 223         static u8 instruction[][2] = {
 224                 {0x06, 0x00},
 225                 {0x7c, 0x00},
 226                 {0x7d, 0x1a},
 227                 {0x02, 0x00},
 228                 {0x01, 0x00},
 229                 {0x04, 0x52},
 230         };
 231 
 232         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 233                 msleep(60);
 234                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 235                 if (retval < 0)
 236                         return retval;
 237         }
 238         msleep(60);
 239         return retval;
 240 }
 241 
 242 static int jl2005c_stream_start_cif_lg(struct gspca_dev *gspca_dev)
 243 {
 244         int i;
 245         int retval = -1;
 246         static u8 instruction[][2] = {
 247                 {0x05, 0x00},
 248                 {0x7c, 0x00},
 249                 {0x7d, 0x30},
 250                 {0x02, 0x00},
 251                 {0x01, 0x00},
 252                 {0x04, 0x42},
 253         };
 254 
 255         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 256                 msleep(60);
 257                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 258                 if (retval < 0)
 259                         return retval;
 260         }
 261         msleep(60);
 262         return retval;
 263 }
 264 
 265 static int jl2005c_stream_start_cif_small(struct gspca_dev *gspca_dev)
 266 {
 267         int i;
 268         int retval = -1;
 269         static u8 instruction[][2] = {
 270                 {0x06, 0x00},
 271                 {0x7c, 0x00},
 272                 {0x7d, 0x32},
 273                 {0x02, 0x00},
 274                 {0x01, 0x00},
 275                 {0x04, 0x42},
 276         };
 277 
 278         for (i = 0; i < ARRAY_SIZE(instruction); i++) {
 279                 msleep(60);
 280                 retval = jl2005c_write2(gspca_dev, instruction[i]);
 281                 if (retval < 0)
 282                         return retval;
 283         }
 284         msleep(60);
 285         return retval;
 286 }
 287 
 288 
 289 static int jl2005c_stop(struct gspca_dev *gspca_dev)
 290 {
 291         return jl2005c_write_reg(gspca_dev, 0x07, 0x00);
 292 }
 293 
 294 /*
 295  * This function is called as a workqueue function and runs whenever the camera
 296  * is streaming data. Because it is a workqueue function it is allowed to sleep
 297  * so we can use synchronous USB calls. To avoid possible collisions with other
 298  * threads attempting to use gspca_dev->usb_buf we take the usb_lock when
 299  * performing USB operations using it. In practice we don't really need this
 300  * as the camera doesn't provide any controls.
 301  */
 302 static void jl2005c_dostream(struct work_struct *work)
 303 {
 304         struct sd *dev = container_of(work, struct sd, work_struct);
 305         struct gspca_dev *gspca_dev = &dev->gspca_dev;
 306         int bytes_left = 0; /* bytes remaining in current frame. */
 307         int data_len;   /* size to use for the next read. */
 308         int header_read = 0;
 309         unsigned char header_sig[2] = {0x4a, 0x4c};
 310         int act_len;
 311         int packet_type;
 312         int ret;
 313         u8 *buffer;
 314 
 315         buffer = kmalloc(JL2005C_MAX_TRANSFER, GFP_KERNEL);
 316         if (!buffer) {
 317                 pr_err("Couldn't allocate USB buffer\n");
 318                 goto quit_stream;
 319         }
 320 
 321         while (gspca_dev->present && gspca_dev->streaming) {
 322 #ifdef CONFIG_PM
 323                 if (gspca_dev->frozen)
 324                         break;
 325 #endif
 326                 /* Check if this is a new frame. If so, start the frame first */
 327                 if (!header_read) {
 328                         mutex_lock(&gspca_dev->usb_lock);
 329                         ret = jl2005c_start_new_frame(gspca_dev);
 330                         mutex_unlock(&gspca_dev->usb_lock);
 331                         if (ret < 0)
 332                                 goto quit_stream;
 333                         ret = usb_bulk_msg(gspca_dev->dev,
 334                                 usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 335                                 buffer, JL2005C_MAX_TRANSFER, &act_len,
 336                                 JL2005C_DATA_TIMEOUT);
 337                         gspca_dbg(gspca_dev, D_PACK,
 338                                   "Got %d bytes out of %d for header\n",
 339                                   act_len, JL2005C_MAX_TRANSFER);
 340                         if (ret < 0 || act_len < JL2005C_MAX_TRANSFER)
 341                                 goto quit_stream;
 342                         /* Check whether we actually got the first blodk */
 343                         if (memcmp(header_sig, buffer, 2) != 0) {
 344                                 pr_err("First block is not the first block\n");
 345                                 goto quit_stream;
 346                         }
 347                         /* total size to fetch is byte 7, times blocksize
 348                          * of which we already got act_len */
 349                         bytes_left = buffer[0x07] * dev->block_size - act_len;
 350                         gspca_dbg(gspca_dev, D_PACK, "bytes_left = 0x%x\n",
 351                                   bytes_left);
 352                         /* We keep the header. It has other information, too.*/
 353                         packet_type = FIRST_PACKET;
 354                         gspca_frame_add(gspca_dev, packet_type,
 355                                         buffer, act_len);
 356                         header_read = 1;
 357                 }
 358                 while (bytes_left > 0 && gspca_dev->present) {
 359                         data_len = bytes_left > JL2005C_MAX_TRANSFER ?
 360                                 JL2005C_MAX_TRANSFER : bytes_left;
 361                         ret = usb_bulk_msg(gspca_dev->dev,
 362                                 usb_rcvbulkpipe(gspca_dev->dev, 0x82),
 363                                 buffer, data_len, &act_len,
 364                                 JL2005C_DATA_TIMEOUT);
 365                         if (ret < 0 || act_len < data_len)
 366                                 goto quit_stream;
 367                         gspca_dbg(gspca_dev, D_PACK,
 368                                   "Got %d bytes out of %d for frame\n",
 369                                   data_len, bytes_left);
 370                         bytes_left -= data_len;
 371                         if (bytes_left == 0) {
 372                                 packet_type = LAST_PACKET;
 373                                 header_read = 0;
 374                         } else
 375                                 packet_type = INTER_PACKET;
 376                         gspca_frame_add(gspca_dev, packet_type,
 377                                         buffer, data_len);
 378                 }
 379         }
 380 quit_stream:
 381         if (gspca_dev->present) {
 382                 mutex_lock(&gspca_dev->usb_lock);
 383                 jl2005c_stop(gspca_dev);
 384                 mutex_unlock(&gspca_dev->usb_lock);
 385         }
 386         kfree(buffer);
 387 }
 388 
 389 
 390 
 391 
 392 /* This function is called at probe time */
 393 static int sd_config(struct gspca_dev *gspca_dev,
 394                         const struct usb_device_id *id)
 395 {
 396         struct cam *cam;
 397         struct sd *sd = (struct sd *) gspca_dev;
 398 
 399         cam = &gspca_dev->cam;
 400         /* We don't use the buffer gspca allocates so make it small. */
 401         cam->bulk_size = 64;
 402         cam->bulk = 1;
 403         /* For the rest, the camera needs to be detected */
 404         jl2005c_get_firmware_id(gspca_dev);
 405         /* Here are some known firmware IDs
 406          * First some JL2005B cameras
 407          * {0x41, 0x07, 0x04, 0x2c, 0xe8, 0xf2} Sakar KidzCam
 408          * {0x45, 0x02, 0x08, 0xb9, 0x00, 0xd2} No-name JL2005B
 409          * JL2005C cameras
 410          * {0x01, 0x0c, 0x16, 0x10, 0xf8, 0xc8} Argus DC-1512
 411          * {0x12, 0x04, 0x03, 0xc0, 0x00, 0xd8} ICarly
 412          * {0x86, 0x08, 0x05, 0x02, 0x00, 0xd4} Jazz
 413          *
 414          * Based upon this scanty evidence, we can detect a CIF camera by
 415          * testing byte 0 for 0x4x.
 416          */
 417         if ((sd->firmware_id[0] & 0xf0) == 0x40) {
 418                 cam->cam_mode   = cif_mode;
 419                 cam->nmodes     = ARRAY_SIZE(cif_mode);
 420                 sd->block_size  = 0x80;
 421         } else {
 422                 cam->cam_mode   = vga_mode;
 423                 cam->nmodes     = ARRAY_SIZE(vga_mode);
 424                 sd->block_size  = 0x200;
 425         }
 426 
 427         INIT_WORK(&sd->work_struct, jl2005c_dostream);
 428 
 429         return 0;
 430 }
 431 
 432 /* this function is called at probe and resume time */
 433 static int sd_init(struct gspca_dev *gspca_dev)
 434 {
 435         return 0;
 436 }
 437 
 438 static int sd_start(struct gspca_dev *gspca_dev)
 439 {
 440 
 441         struct sd *sd = (struct sd *) gspca_dev;
 442         sd->cap_mode = gspca_dev->cam.cam_mode;
 443 
 444         switch (gspca_dev->pixfmt.width) {
 445         case 640:
 446                 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at vga resolution\n");
 447                 jl2005c_stream_start_vga_lg(gspca_dev);
 448                 break;
 449         case 320:
 450                 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at qvga resolution\n");
 451                 jl2005c_stream_start_vga_small(gspca_dev);
 452                 break;
 453         case 352:
 454                 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at cif resolution\n");
 455                 jl2005c_stream_start_cif_lg(gspca_dev);
 456                 break;
 457         case 176:
 458                 gspca_dbg(gspca_dev, D_STREAM, "Start streaming at qcif resolution\n");
 459                 jl2005c_stream_start_cif_small(gspca_dev);
 460                 break;
 461         default:
 462                 pr_err("Unknown resolution specified\n");
 463                 return -1;
 464         }
 465 
 466         schedule_work(&sd->work_struct);
 467 
 468         return 0;
 469 }
 470 
 471 /* called on streamoff with alt==0 and on disconnect */
 472 /* the usb_lock is held at entry - restore on exit */
 473 static void sd_stop0(struct gspca_dev *gspca_dev)
 474 {
 475         struct sd *dev = (struct sd *) gspca_dev;
 476 
 477         /* wait for the work queue to terminate */
 478         mutex_unlock(&gspca_dev->usb_lock);
 479         /* This waits for sq905c_dostream to finish */
 480         flush_work(&dev->work_struct);
 481         mutex_lock(&gspca_dev->usb_lock);
 482 }
 483 
 484 
 485 
 486 /* sub-driver description */
 487 static const struct sd_desc sd_desc = {
 488         .name = MODULE_NAME,
 489         .config = sd_config,
 490         .init = sd_init,
 491         .start = sd_start,
 492         .stop0 = sd_stop0,
 493 };
 494 
 495 /* -- module initialisation -- */
 496 static const struct usb_device_id device_table[] = {
 497         {USB_DEVICE(0x0979, 0x0227)},
 498         {}
 499 };
 500 MODULE_DEVICE_TABLE(usb, device_table);
 501 
 502 /* -- device connect -- */
 503 static int sd_probe(struct usb_interface *intf,
 504                                 const struct usb_device_id *id)
 505 {
 506         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 507                                 THIS_MODULE);
 508 }
 509 
 510 static struct usb_driver sd_driver = {
 511         .name = MODULE_NAME,
 512         .id_table = device_table,
 513         .probe = sd_probe,
 514         .disconnect = gspca_disconnect,
 515 #ifdef CONFIG_PM
 516         .suspend = gspca_suspend,
 517         .resume = gspca_resume,
 518         .reset_resume = gspca_resume,
 519 #endif
 520 };
 521 
 522 module_usb_driver(sd_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/usb/gspca/jl2005bcd.c

DEFINITIONS
