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