1 /* 2 * Fushicai USBTV007 Audio-Video Grabber Driver 3 * 4 * Product web site: 5 * http://www.fushicai.com/products_detail/&productId=d05449ee-b690-42f9-a661-aa7353894bed.html 6 * 7 * Following LWN articles were very useful in construction of this driver: 8 * Video4Linux2 API series: http://lwn.net/Articles/203924/ 9 * videobuf2 API explanation: http://lwn.net/Articles/447435/ 10 * Thanks go to Jonathan Corbet for providing this quality documentation. 11 * He is awesome. 12 * 13 * Copyright (c) 2013 Lubomir Rintel 14 * All rights reserved. 15 * No physical hardware was harmed running Windows during the 16 * reverse-engineering activity 17 * 18 * Redistribution and use in source and binary forms, with or without 19 * modification, are permitted provided that the following conditions 20 * are met: 21 * 1. Redistributions of source code must retain the above copyright 22 * notice, this list of conditions, and the following disclaimer, 23 * without modification. 24 * 2. The name of the author may not be used to endorse or promote products 25 * derived from this software without specific prior written permission. 26 * 27 * Alternatively, this software may be distributed under the terms of the 28 * GNU General Public License ("GPL"). 29 */ 30 31 #include <media/v4l2-ioctl.h> 32 #include <media/videobuf2-core.h> 33 34 #include "usbtv.h" 35 36 static struct usbtv_norm_params norm_params[] = { 37 { 38 .norm = V4L2_STD_525_60, 39 .cap_width = 720, 40 .cap_height = 480, 41 }, 42 { 43 .norm = V4L2_STD_PAL, 44 .cap_width = 720, 45 .cap_height = 576, 46 } 47 }; 48 49 static int usbtv_configure_for_norm(struct usbtv *usbtv, v4l2_std_id norm) 50 { 51 int i, ret = 0; 52 struct usbtv_norm_params *params = NULL; 53 54 for (i = 0; i < ARRAY_SIZE(norm_params); i++) { 55 if (norm_params[i].norm & norm) { 56 params = &norm_params[i]; 57 break; 58 } 59 } 60 61 if (params) { 62 usbtv->width = params->cap_width; 63 usbtv->height = params->cap_height; 64 usbtv->n_chunks = usbtv->width * usbtv->height 65 / 4 / USBTV_CHUNK; 66 usbtv->norm = params->norm; 67 } else 68 ret = -EINVAL; 69 70 return ret; 71 } 72 73 static int usbtv_select_input(struct usbtv *usbtv, int input) 74 { 75 int ret; 76 77 static const u16 composite[][2] = { 78 { USBTV_BASE + 0x0105, 0x0060 }, 79 { USBTV_BASE + 0x011f, 0x00f2 }, 80 { USBTV_BASE + 0x0127, 0x0060 }, 81 { USBTV_BASE + 0x00ae, 0x0010 }, 82 { USBTV_BASE + 0x0239, 0x0060 }, 83 }; 84 85 static const u16 svideo[][2] = { 86 { USBTV_BASE + 0x0105, 0x0010 }, 87 { USBTV_BASE + 0x011f, 0x00ff }, 88 { USBTV_BASE + 0x0127, 0x0060 }, 89 { USBTV_BASE + 0x00ae, 0x0030 }, 90 { USBTV_BASE + 0x0239, 0x0060 }, 91 }; 92 93 switch (input) { 94 case USBTV_COMPOSITE_INPUT: 95 ret = usbtv_set_regs(usbtv, composite, ARRAY_SIZE(composite)); 96 break; 97 case USBTV_SVIDEO_INPUT: 98 ret = usbtv_set_regs(usbtv, svideo, ARRAY_SIZE(svideo)); 99 break; 100 default: 101 ret = -EINVAL; 102 } 103 104 if (!ret) 105 usbtv->input = input; 106 107 return ret; 108 } 109 110 static int usbtv_select_norm(struct usbtv *usbtv, v4l2_std_id norm) 111 { 112 int ret; 113 static const u16 pal[][2] = { 114 { USBTV_BASE + 0x001a, 0x0068 }, 115 { USBTV_BASE + 0x010e, 0x0072 }, 116 { USBTV_BASE + 0x010f, 0x00a2 }, 117 { USBTV_BASE + 0x0112, 0x00b0 }, 118 { USBTV_BASE + 0x0117, 0x0001 }, 119 { USBTV_BASE + 0x0118, 0x002c }, 120 { USBTV_BASE + 0x012d, 0x0010 }, 121 { USBTV_BASE + 0x012f, 0x0020 }, 122 { USBTV_BASE + 0x024f, 0x0002 }, 123 { USBTV_BASE + 0x0254, 0x0059 }, 124 { USBTV_BASE + 0x025a, 0x0016 }, 125 { USBTV_BASE + 0x025b, 0x0035 }, 126 { USBTV_BASE + 0x0263, 0x0017 }, 127 { USBTV_BASE + 0x0266, 0x0016 }, 128 { USBTV_BASE + 0x0267, 0x0036 } 129 }; 130 131 static const u16 ntsc[][2] = { 132 { USBTV_BASE + 0x001a, 0x0079 }, 133 { USBTV_BASE + 0x010e, 0x0068 }, 134 { USBTV_BASE + 0x010f, 0x009c }, 135 { USBTV_BASE + 0x0112, 0x00f0 }, 136 { USBTV_BASE + 0x0117, 0x0000 }, 137 { USBTV_BASE + 0x0118, 0x00fc }, 138 { USBTV_BASE + 0x012d, 0x0004 }, 139 { USBTV_BASE + 0x012f, 0x0008 }, 140 { USBTV_BASE + 0x024f, 0x0001 }, 141 { USBTV_BASE + 0x0254, 0x005f }, 142 { USBTV_BASE + 0x025a, 0x0012 }, 143 { USBTV_BASE + 0x025b, 0x0001 }, 144 { USBTV_BASE + 0x0263, 0x001c }, 145 { USBTV_BASE + 0x0266, 0x0011 }, 146 { USBTV_BASE + 0x0267, 0x0005 } 147 }; 148 149 ret = usbtv_configure_for_norm(usbtv, norm); 150 151 if (!ret) { 152 if (norm & V4L2_STD_525_60) 153 ret = usbtv_set_regs(usbtv, ntsc, ARRAY_SIZE(ntsc)); 154 else if (norm & V4L2_STD_PAL) 155 ret = usbtv_set_regs(usbtv, pal, ARRAY_SIZE(pal)); 156 } 157 158 return ret; 159 } 160 161 static int usbtv_setup_capture(struct usbtv *usbtv) 162 { 163 int ret; 164 static const u16 setup[][2] = { 165 /* These seem to enable the device. */ 166 { USBTV_BASE + 0x0008, 0x0001 }, 167 { USBTV_BASE + 0x01d0, 0x00ff }, 168 { USBTV_BASE + 0x01d9, 0x0002 }, 169 170 /* These seem to influence color parameters, such as 171 * brightness, etc. */ 172 { USBTV_BASE + 0x0239, 0x0040 }, 173 { USBTV_BASE + 0x0240, 0x0000 }, 174 { USBTV_BASE + 0x0241, 0x0000 }, 175 { USBTV_BASE + 0x0242, 0x0002 }, 176 { USBTV_BASE + 0x0243, 0x0080 }, 177 { USBTV_BASE + 0x0244, 0x0012 }, 178 { USBTV_BASE + 0x0245, 0x0090 }, 179 { USBTV_BASE + 0x0246, 0x0000 }, 180 181 { USBTV_BASE + 0x0278, 0x002d }, 182 { USBTV_BASE + 0x0279, 0x000a }, 183 { USBTV_BASE + 0x027a, 0x0032 }, 184 { 0xf890, 0x000c }, 185 { 0xf894, 0x0086 }, 186 187 { USBTV_BASE + 0x00ac, 0x00c0 }, 188 { USBTV_BASE + 0x00ad, 0x0000 }, 189 { USBTV_BASE + 0x00a2, 0x0012 }, 190 { USBTV_BASE + 0x00a3, 0x00e0 }, 191 { USBTV_BASE + 0x00a4, 0x0028 }, 192 { USBTV_BASE + 0x00a5, 0x0082 }, 193 { USBTV_BASE + 0x00a7, 0x0080 }, 194 { USBTV_BASE + 0x0000, 0x0014 }, 195 { USBTV_BASE + 0x0006, 0x0003 }, 196 { USBTV_BASE + 0x0090, 0x0099 }, 197 { USBTV_BASE + 0x0091, 0x0090 }, 198 { USBTV_BASE + 0x0094, 0x0068 }, 199 { USBTV_BASE + 0x0095, 0x0070 }, 200 { USBTV_BASE + 0x009c, 0x0030 }, 201 { USBTV_BASE + 0x009d, 0x00c0 }, 202 { USBTV_BASE + 0x009e, 0x00e0 }, 203 { USBTV_BASE + 0x0019, 0x0006 }, 204 { USBTV_BASE + 0x008c, 0x00ba }, 205 { USBTV_BASE + 0x0101, 0x00ff }, 206 { USBTV_BASE + 0x010c, 0x00b3 }, 207 { USBTV_BASE + 0x01b2, 0x0080 }, 208 { USBTV_BASE + 0x01b4, 0x00a0 }, 209 { USBTV_BASE + 0x014c, 0x00ff }, 210 { USBTV_BASE + 0x014d, 0x00ca }, 211 { USBTV_BASE + 0x0113, 0x0053 }, 212 { USBTV_BASE + 0x0119, 0x008a }, 213 { USBTV_BASE + 0x013c, 0x0003 }, 214 { USBTV_BASE + 0x0150, 0x009c }, 215 { USBTV_BASE + 0x0151, 0x0071 }, 216 { USBTV_BASE + 0x0152, 0x00c6 }, 217 { USBTV_BASE + 0x0153, 0x0084 }, 218 { USBTV_BASE + 0x0154, 0x00bc }, 219 { USBTV_BASE + 0x0155, 0x00a0 }, 220 { USBTV_BASE + 0x0156, 0x00a0 }, 221 { USBTV_BASE + 0x0157, 0x009c }, 222 { USBTV_BASE + 0x0158, 0x001f }, 223 { USBTV_BASE + 0x0159, 0x0006 }, 224 { USBTV_BASE + 0x015d, 0x0000 }, 225 226 { USBTV_BASE + 0x0003, 0x0004 }, 227 { USBTV_BASE + 0x0100, 0x00d3 }, 228 { USBTV_BASE + 0x0115, 0x0015 }, 229 { USBTV_BASE + 0x0220, 0x002e }, 230 { USBTV_BASE + 0x0225, 0x0008 }, 231 { USBTV_BASE + 0x024e, 0x0002 }, 232 { USBTV_BASE + 0x024e, 0x0002 }, 233 { USBTV_BASE + 0x024f, 0x0002 }, 234 }; 235 236 ret = usbtv_set_regs(usbtv, setup, ARRAY_SIZE(setup)); 237 if (ret) 238 return ret; 239 240 ret = usbtv_select_norm(usbtv, usbtv->norm); 241 if (ret) 242 return ret; 243 244 ret = usbtv_select_input(usbtv, usbtv->input); 245 if (ret) 246 return ret; 247 248 return 0; 249 } 250 251 /* Copy data from chunk into a frame buffer, deinterlacing the data 252 * into every second line. Unfortunately, they don't align nicely into 253 * 720 pixel lines, as the chunk is 240 words long, which is 480 pixels. 254 * Therefore, we break down the chunk into two halves before copyting, 255 * so that we can interleave a line if needed. */ 256 static void usbtv_chunk_to_vbuf(u32 *frame, __be32 *src, int chunk_no, int odd) 257 { 258 int half; 259 260 for (half = 0; half < 2; half++) { 261 int part_no = chunk_no * 2 + half; 262 int line = part_no / 3; 263 int part_index = (line * 2 + !odd) * 3 + (part_no % 3); 264 265 u32 *dst = &frame[part_index * USBTV_CHUNK/2]; 266 267 memcpy(dst, src, USBTV_CHUNK/2 * sizeof(*src)); 268 src += USBTV_CHUNK/2; 269 } 270 } 271 272 /* Called for each 256-byte image chunk. 273 * First word identifies the chunk, followed by 240 words of image 274 * data and padding. */ 275 static void usbtv_image_chunk(struct usbtv *usbtv, __be32 *chunk) 276 { 277 int frame_id, odd, chunk_no; 278 u32 *frame; 279 struct usbtv_buf *buf; 280 unsigned long flags; 281 282 /* Ignore corrupted lines. */ 283 if (!USBTV_MAGIC_OK(chunk)) 284 return; 285 frame_id = USBTV_FRAME_ID(chunk); 286 odd = USBTV_ODD(chunk); 287 chunk_no = USBTV_CHUNK_NO(chunk); 288 if (chunk_no >= usbtv->n_chunks) 289 return; 290 291 /* Beginning of a frame. */ 292 if (chunk_no == 0) { 293 usbtv->frame_id = frame_id; 294 usbtv->chunks_done = 0; 295 } 296 297 if (usbtv->frame_id != frame_id) 298 return; 299 300 spin_lock_irqsave(&usbtv->buflock, flags); 301 if (list_empty(&usbtv->bufs)) { 302 /* No free buffers. Userspace likely too slow. */ 303 spin_unlock_irqrestore(&usbtv->buflock, flags); 304 return; 305 } 306 307 /* First available buffer. */ 308 buf = list_first_entry(&usbtv->bufs, struct usbtv_buf, list); 309 frame = vb2_plane_vaddr(&buf->vb, 0); 310 311 /* Copy the chunk data. */ 312 usbtv_chunk_to_vbuf(frame, &chunk[1], chunk_no, odd); 313 usbtv->chunks_done++; 314 315 /* Last chunk in a frame, signalling an end */ 316 if (odd && chunk_no == usbtv->n_chunks-1) { 317 int size = vb2_plane_size(&buf->vb, 0); 318 enum vb2_buffer_state state = usbtv->chunks_done == 319 usbtv->n_chunks ? 320 VB2_BUF_STATE_DONE : 321 VB2_BUF_STATE_ERROR; 322 323 buf->vb.v4l2_buf.field = V4L2_FIELD_INTERLACED; 324 buf->vb.v4l2_buf.sequence = usbtv->sequence++; 325 v4l2_get_timestamp(&buf->vb.v4l2_buf.timestamp); 326 vb2_set_plane_payload(&buf->vb, 0, size); 327 vb2_buffer_done(&buf->vb, state); 328 list_del(&buf->list); 329 } 330 331 spin_unlock_irqrestore(&usbtv->buflock, flags); 332 } 333 334 /* Got image data. Each packet contains a number of 256-word chunks we 335 * compose the image from. */ 336 static void usbtv_iso_cb(struct urb *ip) 337 { 338 int ret; 339 int i; 340 struct usbtv *usbtv = (struct usbtv *)ip->context; 341 342 switch (ip->status) { 343 /* All fine. */ 344 case 0: 345 break; 346 /* Device disconnected or capture stopped? */ 347 case -ENODEV: 348 case -ENOENT: 349 case -ECONNRESET: 350 case -ESHUTDOWN: 351 return; 352 /* Unknown error. Retry. */ 353 default: 354 dev_warn(usbtv->dev, "Bad response for ISO request.\n"); 355 goto resubmit; 356 } 357 358 for (i = 0; i < ip->number_of_packets; i++) { 359 int size = ip->iso_frame_desc[i].actual_length; 360 unsigned char *data = ip->transfer_buffer + 361 ip->iso_frame_desc[i].offset; 362 int offset; 363 364 for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++) 365 usbtv_image_chunk(usbtv, 366 (__be32 *)&data[USBTV_CHUNK_SIZE * offset]); 367 } 368 369 resubmit: 370 ret = usb_submit_urb(ip, GFP_ATOMIC); 371 if (ret < 0) 372 dev_warn(usbtv->dev, "Could not resubmit ISO URB\n"); 373 } 374 375 static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv) 376 { 377 struct urb *ip; 378 int size = usbtv->iso_size; 379 int i; 380 381 ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL); 382 if (ip == NULL) 383 return NULL; 384 385 ip->dev = usbtv->udev; 386 ip->context = usbtv; 387 ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP); 388 ip->interval = 1; 389 ip->transfer_flags = URB_ISO_ASAP; 390 ip->transfer_buffer = kzalloc(size * USBTV_ISOC_PACKETS, 391 GFP_KERNEL); 392 ip->complete = usbtv_iso_cb; 393 ip->number_of_packets = USBTV_ISOC_PACKETS; 394 ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS; 395 for (i = 0; i < USBTV_ISOC_PACKETS; i++) { 396 ip->iso_frame_desc[i].offset = size * i; 397 ip->iso_frame_desc[i].length = size; 398 } 399 400 return ip; 401 } 402 403 static void usbtv_stop(struct usbtv *usbtv) 404 { 405 int i; 406 unsigned long flags; 407 408 /* Cancel running transfers. */ 409 for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) { 410 struct urb *ip = usbtv->isoc_urbs[i]; 411 412 if (ip == NULL) 413 continue; 414 usb_kill_urb(ip); 415 kfree(ip->transfer_buffer); 416 usb_free_urb(ip); 417 usbtv->isoc_urbs[i] = NULL; 418 } 419 420 /* Return buffers to userspace. */ 421 spin_lock_irqsave(&usbtv->buflock, flags); 422 while (!list_empty(&usbtv->bufs)) { 423 struct usbtv_buf *buf = list_first_entry(&usbtv->bufs, 424 struct usbtv_buf, list); 425 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); 426 list_del(&buf->list); 427 } 428 spin_unlock_irqrestore(&usbtv->buflock, flags); 429 } 430 431 static int usbtv_start(struct usbtv *usbtv) 432 { 433 int i; 434 int ret; 435 436 usbtv_audio_suspend(usbtv); 437 438 ret = usb_set_interface(usbtv->udev, 0, 0); 439 if (ret < 0) 440 return ret; 441 442 ret = usbtv_setup_capture(usbtv); 443 if (ret < 0) 444 return ret; 445 446 ret = usb_set_interface(usbtv->udev, 0, 1); 447 if (ret < 0) 448 return ret; 449 450 usbtv_audio_resume(usbtv); 451 452 for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) { 453 struct urb *ip; 454 455 ip = usbtv_setup_iso_transfer(usbtv); 456 if (ip == NULL) { 457 ret = -ENOMEM; 458 goto start_fail; 459 } 460 usbtv->isoc_urbs[i] = ip; 461 462 ret = usb_submit_urb(ip, GFP_KERNEL); 463 if (ret < 0) 464 goto start_fail; 465 } 466 467 return 0; 468 469 start_fail: 470 usbtv_stop(usbtv); 471 return ret; 472 } 473 474 static int usbtv_querycap(struct file *file, void *priv, 475 struct v4l2_capability *cap) 476 { 477 struct usbtv *dev = video_drvdata(file); 478 479 strlcpy(cap->driver, "usbtv", sizeof(cap->driver)); 480 strlcpy(cap->card, "usbtv", sizeof(cap->card)); 481 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info)); 482 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE; 483 cap->device_caps |= V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; 484 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 485 return 0; 486 } 487 488 static int usbtv_enum_input(struct file *file, void *priv, 489 struct v4l2_input *i) 490 { 491 struct usbtv *dev = video_drvdata(file); 492 493 switch (i->index) { 494 case USBTV_COMPOSITE_INPUT: 495 strlcpy(i->name, "Composite", sizeof(i->name)); 496 break; 497 case USBTV_SVIDEO_INPUT: 498 strlcpy(i->name, "S-Video", sizeof(i->name)); 499 break; 500 default: 501 return -EINVAL; 502 } 503 504 i->type = V4L2_INPUT_TYPE_CAMERA; 505 i->std = dev->vdev.tvnorms; 506 return 0; 507 } 508 509 static int usbtv_enum_fmt_vid_cap(struct file *file, void *priv, 510 struct v4l2_fmtdesc *f) 511 { 512 if (f->index > 0) 513 return -EINVAL; 514 515 strlcpy(f->description, "16 bpp YUY2, 4:2:2, packed", 516 sizeof(f->description)); 517 f->pixelformat = V4L2_PIX_FMT_YUYV; 518 return 0; 519 } 520 521 static int usbtv_fmt_vid_cap(struct file *file, void *priv, 522 struct v4l2_format *f) 523 { 524 struct usbtv *usbtv = video_drvdata(file); 525 526 f->fmt.pix.width = usbtv->width; 527 f->fmt.pix.height = usbtv->height; 528 f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; 529 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 530 f->fmt.pix.bytesperline = usbtv->width * 2; 531 f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height); 532 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 533 534 return 0; 535 } 536 537 static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm) 538 { 539 struct usbtv *usbtv = video_drvdata(file); 540 *norm = usbtv->norm; 541 return 0; 542 } 543 544 static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm) 545 { 546 int ret = -EINVAL; 547 struct usbtv *usbtv = video_drvdata(file); 548 549 if ((norm & V4L2_STD_525_60) || (norm & V4L2_STD_PAL)) 550 ret = usbtv_select_norm(usbtv, norm); 551 552 return ret; 553 } 554 555 static int usbtv_g_input(struct file *file, void *priv, unsigned int *i) 556 { 557 struct usbtv *usbtv = video_drvdata(file); 558 *i = usbtv->input; 559 return 0; 560 } 561 562 static int usbtv_s_input(struct file *file, void *priv, unsigned int i) 563 { 564 struct usbtv *usbtv = video_drvdata(file); 565 566 return usbtv_select_input(usbtv, i); 567 } 568 569 static struct v4l2_ioctl_ops usbtv_ioctl_ops = { 570 .vidioc_querycap = usbtv_querycap, 571 .vidioc_enum_input = usbtv_enum_input, 572 .vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap, 573 .vidioc_g_fmt_vid_cap = usbtv_fmt_vid_cap, 574 .vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap, 575 .vidioc_s_fmt_vid_cap = usbtv_fmt_vid_cap, 576 .vidioc_g_std = usbtv_g_std, 577 .vidioc_s_std = usbtv_s_std, 578 .vidioc_g_input = usbtv_g_input, 579 .vidioc_s_input = usbtv_s_input, 580 581 .vidioc_reqbufs = vb2_ioctl_reqbufs, 582 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 583 .vidioc_querybuf = vb2_ioctl_querybuf, 584 .vidioc_create_bufs = vb2_ioctl_create_bufs, 585 .vidioc_qbuf = vb2_ioctl_qbuf, 586 .vidioc_dqbuf = vb2_ioctl_dqbuf, 587 .vidioc_streamon = vb2_ioctl_streamon, 588 .vidioc_streamoff = vb2_ioctl_streamoff, 589 }; 590 591 static struct v4l2_file_operations usbtv_fops = { 592 .owner = THIS_MODULE, 593 .unlocked_ioctl = video_ioctl2, 594 .mmap = vb2_fop_mmap, 595 .open = v4l2_fh_open, 596 .release = vb2_fop_release, 597 .read = vb2_fop_read, 598 .poll = vb2_fop_poll, 599 }; 600 601 static int usbtv_queue_setup(struct vb2_queue *vq, 602 const struct v4l2_format *v4l_fmt, unsigned int *nbuffers, 603 unsigned int *nplanes, unsigned int sizes[], void *alloc_ctxs[]) 604 { 605 struct usbtv *usbtv = vb2_get_drv_priv(vq); 606 607 if (*nbuffers < 2) 608 *nbuffers = 2; 609 *nplanes = 1; 610 sizes[0] = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32); 611 612 return 0; 613 } 614 615 static void usbtv_buf_queue(struct vb2_buffer *vb) 616 { 617 struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue); 618 struct usbtv_buf *buf = container_of(vb, struct usbtv_buf, vb); 619 unsigned long flags; 620 621 if (usbtv->udev == NULL) { 622 vb2_buffer_done(vb, VB2_BUF_STATE_ERROR); 623 return; 624 } 625 626 spin_lock_irqsave(&usbtv->buflock, flags); 627 list_add_tail(&buf->list, &usbtv->bufs); 628 spin_unlock_irqrestore(&usbtv->buflock, flags); 629 } 630 631 static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count) 632 { 633 struct usbtv *usbtv = vb2_get_drv_priv(vq); 634 635 if (usbtv->udev == NULL) 636 return -ENODEV; 637 638 return usbtv_start(usbtv); 639 } 640 641 static void usbtv_stop_streaming(struct vb2_queue *vq) 642 { 643 struct usbtv *usbtv = vb2_get_drv_priv(vq); 644 645 if (usbtv->udev) 646 usbtv_stop(usbtv); 647 } 648 649 static struct vb2_ops usbtv_vb2_ops = { 650 .queue_setup = usbtv_queue_setup, 651 .buf_queue = usbtv_buf_queue, 652 .start_streaming = usbtv_start_streaming, 653 .stop_streaming = usbtv_stop_streaming, 654 }; 655 656 static void usbtv_release(struct v4l2_device *v4l2_dev) 657 { 658 struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev); 659 660 v4l2_device_unregister(&usbtv->v4l2_dev); 661 vb2_queue_release(&usbtv->vb2q); 662 kfree(usbtv); 663 } 664 665 int usbtv_video_init(struct usbtv *usbtv) 666 { 667 int ret; 668 669 (void)usbtv_configure_for_norm(usbtv, V4L2_STD_525_60); 670 671 spin_lock_init(&usbtv->buflock); 672 mutex_init(&usbtv->v4l2_lock); 673 mutex_init(&usbtv->vb2q_lock); 674 INIT_LIST_HEAD(&usbtv->bufs); 675 676 /* videobuf2 structure */ 677 usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 678 usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ; 679 usbtv->vb2q.drv_priv = usbtv; 680 usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf); 681 usbtv->vb2q.ops = &usbtv_vb2_ops; 682 usbtv->vb2q.mem_ops = &vb2_vmalloc_memops; 683 usbtv->vb2q.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 684 usbtv->vb2q.lock = &usbtv->vb2q_lock; 685 ret = vb2_queue_init(&usbtv->vb2q); 686 if (ret < 0) { 687 dev_warn(usbtv->dev, "Could not initialize videobuf2 queue\n"); 688 return ret; 689 } 690 691 /* v4l2 structure */ 692 usbtv->v4l2_dev.release = usbtv_release; 693 ret = v4l2_device_register(usbtv->dev, &usbtv->v4l2_dev); 694 if (ret < 0) { 695 dev_warn(usbtv->dev, "Could not register v4l2 device\n"); 696 goto v4l2_fail; 697 } 698 699 /* Video structure */ 700 strlcpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name)); 701 usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev; 702 usbtv->vdev.release = video_device_release_empty; 703 usbtv->vdev.fops = &usbtv_fops; 704 usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops; 705 usbtv->vdev.tvnorms = USBTV_TV_STD; 706 usbtv->vdev.queue = &usbtv->vb2q; 707 usbtv->vdev.lock = &usbtv->v4l2_lock; 708 video_set_drvdata(&usbtv->vdev, usbtv); 709 ret = video_register_device(&usbtv->vdev, VFL_TYPE_GRABBER, -1); 710 if (ret < 0) { 711 dev_warn(usbtv->dev, "Could not register video device\n"); 712 goto vdev_fail; 713 } 714 715 return 0; 716 717 vdev_fail: 718 v4l2_device_unregister(&usbtv->v4l2_dev); 719 v4l2_fail: 720 vb2_queue_release(&usbtv->vb2q); 721 722 return ret; 723 } 724 725 void usbtv_video_free(struct usbtv *usbtv) 726 { 727 mutex_lock(&usbtv->vb2q_lock); 728 mutex_lock(&usbtv->v4l2_lock); 729 730 usbtv_stop(usbtv); 731 video_unregister_device(&usbtv->vdev); 732 v4l2_device_disconnect(&usbtv->v4l2_dev); 733 734 mutex_unlock(&usbtv->v4l2_lock); 735 mutex_unlock(&usbtv->vb2q_lock); 736 737 v4l2_device_put(&usbtv->v4l2_dev); 738 } 739