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-v4l2.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.vb2_buf, 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 field */ 316 if (chunk_no == usbtv->n_chunks-1) { 317 /* Last chunk in a frame, signalling an end */ 318 if (odd && !usbtv->last_odd) { 319 int size = vb2_plane_size(&buf->vb.vb2_buf, 0); 320 enum vb2_buffer_state state = usbtv->chunks_done == 321 usbtv->n_chunks ? 322 VB2_BUF_STATE_DONE : 323 VB2_BUF_STATE_ERROR; 324 325 buf->vb.field = V4L2_FIELD_INTERLACED; 326 buf->vb.sequence = usbtv->sequence++; 327 buf->vb.vb2_buf.timestamp = ktime_get_ns(); 328 vb2_set_plane_payload(&buf->vb.vb2_buf, 0, size); 329 vb2_buffer_done(&buf->vb.vb2_buf, state); 330 list_del(&buf->list); 331 } 332 usbtv->last_odd = odd; 333 } 334 335 spin_unlock_irqrestore(&usbtv->buflock, flags); 336 } 337 338 /* Got image data. Each packet contains a number of 256-word chunks we 339 * compose the image from. */ 340 static void usbtv_iso_cb(struct urb *ip) 341 { 342 int ret; 343 int i; 344 struct usbtv *usbtv = (struct usbtv *)ip->context; 345 346 switch (ip->status) { 347 /* All fine. */ 348 case 0: 349 break; 350 /* Device disconnected or capture stopped? */ 351 case -ENODEV: 352 case -ENOENT: 353 case -ECONNRESET: 354 case -ESHUTDOWN: 355 return; 356 /* Unknown error. Retry. */ 357 default: 358 dev_warn(usbtv->dev, "Bad response for ISO request.\n"); 359 goto resubmit; 360 } 361 362 for (i = 0; i < ip->number_of_packets; i++) { 363 int size = ip->iso_frame_desc[i].actual_length; 364 unsigned char *data = ip->transfer_buffer + 365 ip->iso_frame_desc[i].offset; 366 int offset; 367 368 for (offset = 0; USBTV_CHUNK_SIZE * offset < size; offset++) 369 usbtv_image_chunk(usbtv, 370 (__be32 *)&data[USBTV_CHUNK_SIZE * offset]); 371 } 372 373 resubmit: 374 ret = usb_submit_urb(ip, GFP_ATOMIC); 375 if (ret < 0) 376 dev_warn(usbtv->dev, "Could not resubmit ISO URB\n"); 377 } 378 379 static struct urb *usbtv_setup_iso_transfer(struct usbtv *usbtv) 380 { 381 struct urb *ip; 382 int size = usbtv->iso_size; 383 int i; 384 385 ip = usb_alloc_urb(USBTV_ISOC_PACKETS, GFP_KERNEL); 386 if (ip == NULL) 387 return NULL; 388 389 ip->dev = usbtv->udev; 390 ip->context = usbtv; 391 ip->pipe = usb_rcvisocpipe(usbtv->udev, USBTV_VIDEO_ENDP); 392 ip->interval = 1; 393 ip->transfer_flags = URB_ISO_ASAP; 394 ip->transfer_buffer = kzalloc(size * USBTV_ISOC_PACKETS, 395 GFP_KERNEL); 396 if (!ip->transfer_buffer) { 397 usb_free_urb(ip); 398 return NULL; 399 } 400 ip->complete = usbtv_iso_cb; 401 ip->number_of_packets = USBTV_ISOC_PACKETS; 402 ip->transfer_buffer_length = size * USBTV_ISOC_PACKETS; 403 for (i = 0; i < USBTV_ISOC_PACKETS; i++) { 404 ip->iso_frame_desc[i].offset = size * i; 405 ip->iso_frame_desc[i].length = size; 406 } 407 408 return ip; 409 } 410 411 static void usbtv_stop(struct usbtv *usbtv) 412 { 413 int i; 414 unsigned long flags; 415 416 /* Cancel running transfers. */ 417 for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) { 418 struct urb *ip = usbtv->isoc_urbs[i]; 419 420 if (ip == NULL) 421 continue; 422 usb_kill_urb(ip); 423 kfree(ip->transfer_buffer); 424 usb_free_urb(ip); 425 usbtv->isoc_urbs[i] = NULL; 426 } 427 428 /* Return buffers to userspace. */ 429 spin_lock_irqsave(&usbtv->buflock, flags); 430 while (!list_empty(&usbtv->bufs)) { 431 struct usbtv_buf *buf = list_first_entry(&usbtv->bufs, 432 struct usbtv_buf, list); 433 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 434 list_del(&buf->list); 435 } 436 spin_unlock_irqrestore(&usbtv->buflock, flags); 437 } 438 439 static int usbtv_start(struct usbtv *usbtv) 440 { 441 int i; 442 int ret; 443 444 usbtv_audio_suspend(usbtv); 445 446 ret = usb_set_interface(usbtv->udev, 0, 0); 447 if (ret < 0) 448 return ret; 449 450 ret = usbtv_setup_capture(usbtv); 451 if (ret < 0) 452 return ret; 453 454 ret = usb_set_interface(usbtv->udev, 0, 1); 455 if (ret < 0) 456 return ret; 457 458 usbtv_audio_resume(usbtv); 459 460 for (i = 0; i < USBTV_ISOC_TRANSFERS; i++) { 461 struct urb *ip; 462 463 ip = usbtv_setup_iso_transfer(usbtv); 464 if (ip == NULL) { 465 ret = -ENOMEM; 466 goto start_fail; 467 } 468 usbtv->isoc_urbs[i] = ip; 469 470 ret = usb_submit_urb(ip, GFP_KERNEL); 471 if (ret < 0) 472 goto start_fail; 473 } 474 475 return 0; 476 477 start_fail: 478 usbtv_stop(usbtv); 479 return ret; 480 } 481 482 static int usbtv_querycap(struct file *file, void *priv, 483 struct v4l2_capability *cap) 484 { 485 struct usbtv *dev = video_drvdata(file); 486 487 strlcpy(cap->driver, "usbtv", sizeof(cap->driver)); 488 strlcpy(cap->card, "usbtv", sizeof(cap->card)); 489 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info)); 490 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE; 491 cap->device_caps |= V4L2_CAP_READWRITE | V4L2_CAP_STREAMING; 492 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 493 return 0; 494 } 495 496 static int usbtv_enum_input(struct file *file, void *priv, 497 struct v4l2_input *i) 498 { 499 struct usbtv *dev = video_drvdata(file); 500 501 switch (i->index) { 502 case USBTV_COMPOSITE_INPUT: 503 strlcpy(i->name, "Composite", sizeof(i->name)); 504 break; 505 case USBTV_SVIDEO_INPUT: 506 strlcpy(i->name, "S-Video", sizeof(i->name)); 507 break; 508 default: 509 return -EINVAL; 510 } 511 512 i->type = V4L2_INPUT_TYPE_CAMERA; 513 i->std = dev->vdev.tvnorms; 514 return 0; 515 } 516 517 static int usbtv_enum_fmt_vid_cap(struct file *file, void *priv, 518 struct v4l2_fmtdesc *f) 519 { 520 if (f->index > 0) 521 return -EINVAL; 522 523 strlcpy(f->description, "16 bpp YUY2, 4:2:2, packed", 524 sizeof(f->description)); 525 f->pixelformat = V4L2_PIX_FMT_YUYV; 526 return 0; 527 } 528 529 static int usbtv_fmt_vid_cap(struct file *file, void *priv, 530 struct v4l2_format *f) 531 { 532 struct usbtv *usbtv = video_drvdata(file); 533 534 f->fmt.pix.width = usbtv->width; 535 f->fmt.pix.height = usbtv->height; 536 f->fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; 537 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 538 f->fmt.pix.bytesperline = usbtv->width * 2; 539 f->fmt.pix.sizeimage = (f->fmt.pix.bytesperline * f->fmt.pix.height); 540 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 541 542 return 0; 543 } 544 545 static int usbtv_g_std(struct file *file, void *priv, v4l2_std_id *norm) 546 { 547 struct usbtv *usbtv = video_drvdata(file); 548 *norm = usbtv->norm; 549 return 0; 550 } 551 552 static int usbtv_s_std(struct file *file, void *priv, v4l2_std_id norm) 553 { 554 int ret = -EINVAL; 555 struct usbtv *usbtv = video_drvdata(file); 556 557 if ((norm & V4L2_STD_525_60) || (norm & V4L2_STD_PAL)) 558 ret = usbtv_select_norm(usbtv, norm); 559 560 return ret; 561 } 562 563 static int usbtv_g_input(struct file *file, void *priv, unsigned int *i) 564 { 565 struct usbtv *usbtv = video_drvdata(file); 566 *i = usbtv->input; 567 return 0; 568 } 569 570 static int usbtv_s_input(struct file *file, void *priv, unsigned int i) 571 { 572 struct usbtv *usbtv = video_drvdata(file); 573 574 return usbtv_select_input(usbtv, i); 575 } 576 577 static struct v4l2_ioctl_ops usbtv_ioctl_ops = { 578 .vidioc_querycap = usbtv_querycap, 579 .vidioc_enum_input = usbtv_enum_input, 580 .vidioc_enum_fmt_vid_cap = usbtv_enum_fmt_vid_cap, 581 .vidioc_g_fmt_vid_cap = usbtv_fmt_vid_cap, 582 .vidioc_try_fmt_vid_cap = usbtv_fmt_vid_cap, 583 .vidioc_s_fmt_vid_cap = usbtv_fmt_vid_cap, 584 .vidioc_g_std = usbtv_g_std, 585 .vidioc_s_std = usbtv_s_std, 586 .vidioc_g_input = usbtv_g_input, 587 .vidioc_s_input = usbtv_s_input, 588 589 .vidioc_reqbufs = vb2_ioctl_reqbufs, 590 .vidioc_prepare_buf = vb2_ioctl_prepare_buf, 591 .vidioc_querybuf = vb2_ioctl_querybuf, 592 .vidioc_create_bufs = vb2_ioctl_create_bufs, 593 .vidioc_qbuf = vb2_ioctl_qbuf, 594 .vidioc_dqbuf = vb2_ioctl_dqbuf, 595 .vidioc_streamon = vb2_ioctl_streamon, 596 .vidioc_streamoff = vb2_ioctl_streamoff, 597 }; 598 599 static struct v4l2_file_operations usbtv_fops = { 600 .owner = THIS_MODULE, 601 .unlocked_ioctl = video_ioctl2, 602 .mmap = vb2_fop_mmap, 603 .open = v4l2_fh_open, 604 .release = vb2_fop_release, 605 .read = vb2_fop_read, 606 .poll = vb2_fop_poll, 607 }; 608 609 static int usbtv_queue_setup(struct vb2_queue *vq, 610 unsigned int *nbuffers, 611 unsigned int *nplanes, unsigned int sizes[], struct device *alloc_devs[]) 612 { 613 struct usbtv *usbtv = vb2_get_drv_priv(vq); 614 unsigned size = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32); 615 616 if (vq->num_buffers + *nbuffers < 2) 617 *nbuffers = 2 - vq->num_buffers; 618 if (*nplanes) 619 return sizes[0] < size ? -EINVAL : 0; 620 *nplanes = 1; 621 sizes[0] = size; 622 623 return 0; 624 } 625 626 static void usbtv_buf_queue(struct vb2_buffer *vb) 627 { 628 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 629 struct usbtv *usbtv = vb2_get_drv_priv(vb->vb2_queue); 630 struct usbtv_buf *buf = container_of(vbuf, struct usbtv_buf, vb); 631 unsigned long flags; 632 633 if (usbtv->udev == NULL) { 634 vb2_buffer_done(vb, VB2_BUF_STATE_ERROR); 635 return; 636 } 637 638 spin_lock_irqsave(&usbtv->buflock, flags); 639 list_add_tail(&buf->list, &usbtv->bufs); 640 spin_unlock_irqrestore(&usbtv->buflock, flags); 641 } 642 643 static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count) 644 { 645 struct usbtv *usbtv = vb2_get_drv_priv(vq); 646 647 if (usbtv->udev == NULL) 648 return -ENODEV; 649 650 usbtv->last_odd = 1; 651 usbtv->sequence = 0; 652 return usbtv_start(usbtv); 653 } 654 655 static void usbtv_stop_streaming(struct vb2_queue *vq) 656 { 657 struct usbtv *usbtv = vb2_get_drv_priv(vq); 658 659 if (usbtv->udev) 660 usbtv_stop(usbtv); 661 } 662 663 static struct vb2_ops usbtv_vb2_ops = { 664 .queue_setup = usbtv_queue_setup, 665 .buf_queue = usbtv_buf_queue, 666 .start_streaming = usbtv_start_streaming, 667 .stop_streaming = usbtv_stop_streaming, 668 }; 669 670 static void usbtv_release(struct v4l2_device *v4l2_dev) 671 { 672 struct usbtv *usbtv = container_of(v4l2_dev, struct usbtv, v4l2_dev); 673 674 v4l2_device_unregister(&usbtv->v4l2_dev); 675 vb2_queue_release(&usbtv->vb2q); 676 kfree(usbtv); 677 } 678 679 int usbtv_video_init(struct usbtv *usbtv) 680 { 681 int ret; 682 683 (void)usbtv_configure_for_norm(usbtv, V4L2_STD_525_60); 684 685 spin_lock_init(&usbtv->buflock); 686 mutex_init(&usbtv->v4l2_lock); 687 mutex_init(&usbtv->vb2q_lock); 688 INIT_LIST_HEAD(&usbtv->bufs); 689 690 /* videobuf2 structure */ 691 usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 692 usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ; 693 usbtv->vb2q.drv_priv = usbtv; 694 usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf); 695 usbtv->vb2q.ops = &usbtv_vb2_ops; 696 usbtv->vb2q.mem_ops = &vb2_vmalloc_memops; 697 usbtv->vb2q.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 698 usbtv->vb2q.lock = &usbtv->vb2q_lock; 699 ret = vb2_queue_init(&usbtv->vb2q); 700 if (ret < 0) { 701 dev_warn(usbtv->dev, "Could not initialize videobuf2 queue\n"); 702 return ret; 703 } 704 705 /* v4l2 structure */ 706 usbtv->v4l2_dev.release = usbtv_release; 707 ret = v4l2_device_register(usbtv->dev, &usbtv->v4l2_dev); 708 if (ret < 0) { 709 dev_warn(usbtv->dev, "Could not register v4l2 device\n"); 710 goto v4l2_fail; 711 } 712 713 /* Video structure */ 714 strlcpy(usbtv->vdev.name, "usbtv", sizeof(usbtv->vdev.name)); 715 usbtv->vdev.v4l2_dev = &usbtv->v4l2_dev; 716 usbtv->vdev.release = video_device_release_empty; 717 usbtv->vdev.fops = &usbtv_fops; 718 usbtv->vdev.ioctl_ops = &usbtv_ioctl_ops; 719 usbtv->vdev.tvnorms = USBTV_TV_STD; 720 usbtv->vdev.queue = &usbtv->vb2q; 721 usbtv->vdev.lock = &usbtv->v4l2_lock; 722 video_set_drvdata(&usbtv->vdev, usbtv); 723 ret = video_register_device(&usbtv->vdev, VFL_TYPE_GRABBER, -1); 724 if (ret < 0) { 725 dev_warn(usbtv->dev, "Could not register video device\n"); 726 goto vdev_fail; 727 } 728 729 return 0; 730 731 vdev_fail: 732 v4l2_device_unregister(&usbtv->v4l2_dev); 733 v4l2_fail: 734 vb2_queue_release(&usbtv->vb2q); 735 736 return ret; 737 } 738 739 void usbtv_video_free(struct usbtv *usbtv) 740 { 741 mutex_lock(&usbtv->vb2q_lock); 742 mutex_lock(&usbtv->v4l2_lock); 743 744 usbtv_stop(usbtv); 745 video_unregister_device(&usbtv->vdev); 746 v4l2_device_disconnect(&usbtv->v4l2_dev); 747 748 mutex_unlock(&usbtv->v4l2_lock); 749 mutex_unlock(&usbtv->vb2q_lock); 750 751 v4l2_device_put(&usbtv->v4l2_dev); 752 } 753