1 /* 2 * STK1160 driver 3 * 4 * Copyright (C) 2012 Ezequiel Garcia 5 * <elezegarcia--a.t--gmail.com> 6 * 7 * Based on Easycap driver by R.M. Thomas 8 * Copyright (C) 2010 R.M. Thomas 9 * <rmthomas--a.t--sciolus.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 */ 22 23 #include <linux/module.h> 24 #include <linux/usb.h> 25 #include <linux/mm.h> 26 #include <linux/slab.h> 27 28 #include <linux/videodev2.h> 29 #include <media/v4l2-device.h> 30 #include <media/v4l2-common.h> 31 #include <media/v4l2-ioctl.h> 32 #include <media/v4l2-fh.h> 33 #include <media/v4l2-event.h> 34 #include <media/videobuf2-vmalloc.h> 35 36 #include <media/i2c/saa7115.h> 37 38 #include "stk1160.h" 39 #include "stk1160-reg.h" 40 41 static bool keep_buffers; 42 module_param(keep_buffers, bool, 0644); 43 MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming"); 44 45 enum stk1160_decimate_mode { 46 STK1160_DECIMATE_MORE_THAN_HALF, 47 STK1160_DECIMATE_LESS_THAN_HALF, 48 }; 49 50 struct stk1160_decimate_ctrl { 51 bool col_en, row_en; 52 enum stk1160_decimate_mode col_mode, row_mode; 53 unsigned int col_n, row_n; 54 }; 55 56 /* supported video standards */ 57 static struct stk1160_fmt format[] = { 58 { 59 .name = "16 bpp YUY2, 4:2:2, packed", 60 .fourcc = V4L2_PIX_FMT_UYVY, 61 .depth = 16, 62 } 63 }; 64 65 /* 66 * Helper to find the next divisor that results in modulo being zero. 67 * This is required to guarantee valid decimation unit counts. 68 */ 69 static unsigned int 70 div_round_integer(unsigned int x, unsigned int y) 71 { 72 for (;; y++) { 73 if (x % y == 0) 74 return x / y; 75 } 76 } 77 78 static void stk1160_set_std(struct stk1160 *dev) 79 { 80 int i; 81 82 static struct regval std525[] = { 83 84 /* 720x480 */ 85 86 /* Frame start */ 87 {STK116_CFSPO_STX_L, 0x0000}, 88 {STK116_CFSPO_STX_H, 0x0000}, 89 {STK116_CFSPO_STY_L, 0x0003}, 90 {STK116_CFSPO_STY_H, 0x0000}, 91 92 /* Frame end */ 93 {STK116_CFEPO_ENX_L, 0x05a0}, 94 {STK116_CFEPO_ENX_H, 0x0005}, 95 {STK116_CFEPO_ENY_L, 0x00f3}, 96 {STK116_CFEPO_ENY_H, 0x0000}, 97 98 {0xffff, 0xffff} 99 }; 100 101 static struct regval std625[] = { 102 103 /* 720x576 */ 104 105 /* TODO: Each line of frame has some junk at the end */ 106 /* Frame start */ 107 {STK116_CFSPO, 0x0000}, 108 {STK116_CFSPO+1, 0x0000}, 109 {STK116_CFSPO+2, 0x0001}, 110 {STK116_CFSPO+3, 0x0000}, 111 112 /* Frame end */ 113 {STK116_CFEPO, 0x05a0}, 114 {STK116_CFEPO+1, 0x0005}, 115 {STK116_CFEPO+2, 0x0121}, 116 {STK116_CFEPO+3, 0x0001}, 117 118 {0xffff, 0xffff} 119 }; 120 121 if (dev->norm & V4L2_STD_525_60) { 122 stk1160_dbg("registers to NTSC like standard\n"); 123 for (i = 0; std525[i].reg != 0xffff; i++) 124 stk1160_write_reg(dev, std525[i].reg, std525[i].val); 125 } else { 126 stk1160_dbg("registers to PAL like standard\n"); 127 for (i = 0; std625[i].reg != 0xffff; i++) 128 stk1160_write_reg(dev, std625[i].reg, std625[i].val); 129 } 130 131 } 132 133 static void stk1160_set_fmt(struct stk1160 *dev, 134 struct stk1160_decimate_ctrl *ctrl) 135 { 136 u32 val = 0; 137 138 if (ctrl) { 139 /* 140 * Since the format is UYVY, the device must skip or send 141 * a number of rows/columns multiple of four. This way, the 142 * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit 143 * does exactly this. 144 */ 145 val |= STK1160_DEC_UNIT_SIZE; 146 val |= ctrl->col_en ? STK1160_H_DEC_EN : 0; 147 val |= ctrl->row_en ? STK1160_V_DEC_EN : 0; 148 val |= ctrl->col_mode == 149 STK1160_DECIMATE_MORE_THAN_HALF ? 150 STK1160_H_DEC_MODE : 0; 151 val |= ctrl->row_mode == 152 STK1160_DECIMATE_MORE_THAN_HALF ? 153 STK1160_V_DEC_MODE : 0; 154 155 /* Horizontal count units */ 156 stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n); 157 /* Vertical count units */ 158 stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n); 159 160 stk1160_dbg("decimate 0x%x, column units %d, row units %d\n", 161 val, ctrl->col_n, ctrl->row_n); 162 } 163 164 /* Decimation control */ 165 stk1160_write_reg(dev, STK1160_DMCTRL, val); 166 } 167 168 /* 169 * Set a new alternate setting. 170 * Returns true is dev->max_pkt_size has changed, false otherwise. 171 */ 172 static bool stk1160_set_alternate(struct stk1160 *dev) 173 { 174 int i, prev_alt = dev->alt; 175 unsigned int min_pkt_size; 176 bool new_pkt_size; 177 178 /* 179 * If we don't set right alternate, 180 * then we will get a green screen with junk. 181 */ 182 min_pkt_size = STK1160_MIN_PKT_SIZE; 183 184 for (i = 0; i < dev->num_alt; i++) { 185 /* stop when the selected alt setting offers enough bandwidth */ 186 if (dev->alt_max_pkt_size[i] >= min_pkt_size) { 187 dev->alt = i; 188 break; 189 /* 190 * otherwise make sure that we end up with the maximum bandwidth 191 * because the min_pkt_size equation might be wrong... 192 */ 193 } else if (dev->alt_max_pkt_size[i] > 194 dev->alt_max_pkt_size[dev->alt]) 195 dev->alt = i; 196 } 197 198 stk1160_dbg("setting alternate %d\n", dev->alt); 199 200 if (dev->alt != prev_alt) { 201 stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n", 202 min_pkt_size, dev->alt); 203 stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n", 204 dev->alt, dev->alt_max_pkt_size[dev->alt]); 205 usb_set_interface(dev->udev, 0, dev->alt); 206 } 207 208 new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt]; 209 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt]; 210 211 return new_pkt_size; 212 } 213 214 static int stk1160_start_streaming(struct stk1160 *dev) 215 { 216 bool new_pkt_size; 217 int rc = 0; 218 int i; 219 220 /* Check device presence */ 221 if (!dev->udev) 222 return -ENODEV; 223 224 if (mutex_lock_interruptible(&dev->v4l_lock)) 225 return -ERESTARTSYS; 226 /* 227 * For some reason it is mandatory to set alternate *first* 228 * and only *then* initialize isoc urbs. 229 * Someone please explain me why ;) 230 */ 231 new_pkt_size = stk1160_set_alternate(dev); 232 233 /* 234 * We (re)allocate isoc urbs if: 235 * there is no allocated isoc urbs, OR 236 * a new dev->max_pkt_size is detected 237 */ 238 if (!dev->isoc_ctl.num_bufs || new_pkt_size) { 239 rc = stk1160_alloc_isoc(dev); 240 if (rc < 0) 241 goto out_stop_hw; 242 } 243 244 /* submit urbs and enables IRQ */ 245 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) { 246 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL); 247 if (rc) { 248 stk1160_err("cannot submit urb[%d] (%d)\n", i, rc); 249 goto out_uninit; 250 } 251 } 252 253 /* Start saa711x */ 254 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1); 255 256 dev->sequence = 0; 257 258 /* Start stk1160 */ 259 stk1160_write_reg(dev, STK1160_DCTRL, 0xb3); 260 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00); 261 262 stk1160_dbg("streaming started\n"); 263 264 mutex_unlock(&dev->v4l_lock); 265 266 return 0; 267 268 out_uninit: 269 stk1160_uninit_isoc(dev); 270 out_stop_hw: 271 usb_set_interface(dev->udev, 0, 0); 272 stk1160_clear_queue(dev); 273 274 mutex_unlock(&dev->v4l_lock); 275 276 return rc; 277 } 278 279 /* Must be called with v4l_lock hold */ 280 static void stk1160_stop_hw(struct stk1160 *dev) 281 { 282 /* If the device is not physically present, there is nothing to do */ 283 if (!dev->udev) 284 return; 285 286 /* set alternate 0 */ 287 dev->alt = 0; 288 stk1160_dbg("setting alternate %d\n", dev->alt); 289 usb_set_interface(dev->udev, 0, 0); 290 291 /* Stop stk1160 */ 292 stk1160_write_reg(dev, STK1160_DCTRL, 0x00); 293 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00); 294 295 /* Stop saa711x */ 296 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0); 297 } 298 299 static int stk1160_stop_streaming(struct stk1160 *dev) 300 { 301 if (mutex_lock_interruptible(&dev->v4l_lock)) 302 return -ERESTARTSYS; 303 304 /* 305 * Once URBs are cancelled, the URB complete handler 306 * won't be running. This is required to safely release the 307 * current buffer (dev->isoc_ctl.buf). 308 */ 309 stk1160_cancel_isoc(dev); 310 311 /* 312 * It is possible to keep buffers around using a module parameter. 313 * This is intended to avoid memory fragmentation. 314 */ 315 if (!keep_buffers) 316 stk1160_free_isoc(dev); 317 318 stk1160_stop_hw(dev); 319 320 stk1160_clear_queue(dev); 321 322 stk1160_dbg("streaming stopped\n"); 323 324 mutex_unlock(&dev->v4l_lock); 325 326 return 0; 327 } 328 329 static struct v4l2_file_operations stk1160_fops = { 330 .owner = THIS_MODULE, 331 .open = v4l2_fh_open, 332 .release = vb2_fop_release, 333 .read = vb2_fop_read, 334 .poll = vb2_fop_poll, 335 .mmap = vb2_fop_mmap, 336 .unlocked_ioctl = video_ioctl2, 337 }; 338 339 /* 340 * vidioc ioctls 341 */ 342 static int vidioc_querycap(struct file *file, 343 void *priv, struct v4l2_capability *cap) 344 { 345 struct stk1160 *dev = video_drvdata(file); 346 347 strcpy(cap->driver, "stk1160"); 348 strcpy(cap->card, "stk1160"); 349 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info)); 350 cap->device_caps = 351 V4L2_CAP_VIDEO_CAPTURE | 352 V4L2_CAP_STREAMING | 353 V4L2_CAP_READWRITE; 354 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 355 return 0; 356 } 357 358 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 359 struct v4l2_fmtdesc *f) 360 { 361 if (f->index != 0) 362 return -EINVAL; 363 364 strlcpy(f->description, format[f->index].name, sizeof(f->description)); 365 f->pixelformat = format[f->index].fourcc; 366 return 0; 367 } 368 369 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 370 struct v4l2_format *f) 371 { 372 struct stk1160 *dev = video_drvdata(file); 373 374 f->fmt.pix.width = dev->width; 375 f->fmt.pix.height = dev->height; 376 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 377 f->fmt.pix.pixelformat = dev->fmt->fourcc; 378 f->fmt.pix.bytesperline = dev->width * 2; 379 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline; 380 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 381 382 return 0; 383 } 384 385 static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f, 386 struct stk1160_decimate_ctrl *ctrl) 387 { 388 unsigned int width, height; 389 unsigned int base_width, base_height; 390 unsigned int col_n, row_n; 391 enum stk1160_decimate_mode col_mode, row_mode; 392 bool col_en, row_en; 393 394 base_width = 720; 395 base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576; 396 397 /* Minimum width and height is 5% the frame size */ 398 width = clamp_t(unsigned int, f->fmt.pix.width, 399 base_width / 20, base_width); 400 height = clamp_t(unsigned int, f->fmt.pix.height, 401 base_height / 20, base_height); 402 403 /* Let's set default no decimation values */ 404 col_n = 0; 405 row_n = 0; 406 col_en = false; 407 row_en = false; 408 f->fmt.pix.width = base_width; 409 f->fmt.pix.height = base_height; 410 row_mode = STK1160_DECIMATE_LESS_THAN_HALF; 411 col_mode = STK1160_DECIMATE_LESS_THAN_HALF; 412 413 if (width < base_width && width > base_width / 2) { 414 /* 415 * The device will send count units for each 416 * unit skipped. This means count unit is: 417 * 418 * n = width / (frame width - width) 419 * 420 * And the width is: 421 * 422 * width = (n / n + 1) * frame width 423 */ 424 col_n = div_round_integer(width, base_width - width); 425 if (col_n > 0 && col_n <= 255) { 426 col_en = true; 427 col_mode = STK1160_DECIMATE_LESS_THAN_HALF; 428 f->fmt.pix.width = (base_width * col_n) / (col_n + 1); 429 } 430 431 } else if (width <= base_width / 2) { 432 433 /* 434 * The device will skip count units for each 435 * unit sent. This means count is: 436 * 437 * n = (frame width / width) - 1 438 * 439 * And the width is: 440 * 441 * width = frame width / (n + 1) 442 */ 443 col_n = div_round_integer(base_width, width) - 1; 444 if (col_n > 0 && col_n <= 255) { 445 col_en = true; 446 col_mode = STK1160_DECIMATE_MORE_THAN_HALF; 447 f->fmt.pix.width = base_width / (col_n + 1); 448 } 449 } 450 451 if (height < base_height && height > base_height / 2) { 452 row_n = div_round_integer(height, base_height - height); 453 if (row_n > 0 && row_n <= 255) { 454 row_en = true; 455 row_mode = STK1160_DECIMATE_LESS_THAN_HALF; 456 f->fmt.pix.height = (base_height * row_n) / (row_n + 1); 457 } 458 459 } else if (height <= base_height / 2) { 460 row_n = div_round_integer(base_height, height) - 1; 461 if (row_n > 0 && row_n <= 255) { 462 row_en = true; 463 row_mode = STK1160_DECIMATE_MORE_THAN_HALF; 464 f->fmt.pix.height = base_height / (row_n + 1); 465 } 466 } 467 468 f->fmt.pix.pixelformat = dev->fmt->fourcc; 469 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 470 f->fmt.pix.bytesperline = f->fmt.pix.width * 2; 471 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; 472 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 473 474 if (ctrl) { 475 ctrl->col_en = col_en; 476 ctrl->col_n = col_n; 477 ctrl->col_mode = col_mode; 478 ctrl->row_en = row_en; 479 ctrl->row_n = row_n; 480 ctrl->row_mode = row_mode; 481 } 482 483 stk1160_dbg("width %d, height %d\n", 484 f->fmt.pix.width, f->fmt.pix.height); 485 return 0; 486 } 487 488 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, 489 struct v4l2_format *f) 490 { 491 struct stk1160 *dev = video_drvdata(file); 492 493 return stk1160_try_fmt(dev, f, NULL); 494 } 495 496 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 497 struct v4l2_format *f) 498 { 499 struct stk1160 *dev = video_drvdata(file); 500 struct vb2_queue *q = &dev->vb_vidq; 501 struct stk1160_decimate_ctrl ctrl; 502 int rc; 503 504 if (vb2_is_busy(q)) 505 return -EBUSY; 506 507 rc = stk1160_try_fmt(dev, f, &ctrl); 508 if (rc < 0) 509 return rc; 510 dev->width = f->fmt.pix.width; 511 dev->height = f->fmt.pix.height; 512 stk1160_set_fmt(dev, &ctrl); 513 514 return 0; 515 } 516 517 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm) 518 { 519 struct stk1160 *dev = video_drvdata(file); 520 v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm); 521 return 0; 522 } 523 524 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm) 525 { 526 struct stk1160 *dev = video_drvdata(file); 527 528 *norm = dev->norm; 529 return 0; 530 } 531 532 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm) 533 { 534 struct stk1160 *dev = video_drvdata(file); 535 struct vb2_queue *q = &dev->vb_vidq; 536 537 if (dev->norm == norm) 538 return 0; 539 540 if (vb2_is_busy(q)) 541 return -EBUSY; 542 543 /* Check device presence */ 544 if (!dev->udev) 545 return -ENODEV; 546 547 /* We need to set this now, before we call stk1160_set_std */ 548 dev->width = 720; 549 dev->height = (norm & V4L2_STD_525_60) ? 480 : 576; 550 dev->norm = norm; 551 552 stk1160_set_std(dev); 553 554 /* Calling with NULL disables frame decimation */ 555 stk1160_set_fmt(dev, NULL); 556 557 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std, 558 dev->norm); 559 560 return 0; 561 } 562 563 564 static int vidioc_enum_input(struct file *file, void *priv, 565 struct v4l2_input *i) 566 { 567 struct stk1160 *dev = video_drvdata(file); 568 569 if (i->index > STK1160_MAX_INPUT) 570 return -EINVAL; 571 572 /* S-Video special handling */ 573 if (i->index == STK1160_SVIDEO_INPUT) 574 sprintf(i->name, "S-Video"); 575 else 576 sprintf(i->name, "Composite%d", i->index); 577 578 i->type = V4L2_INPUT_TYPE_CAMERA; 579 i->std = dev->vdev.tvnorms; 580 return 0; 581 } 582 583 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i) 584 { 585 struct stk1160 *dev = video_drvdata(file); 586 *i = dev->ctl_input; 587 return 0; 588 } 589 590 static int vidioc_s_input(struct file *file, void *priv, unsigned int i) 591 { 592 struct stk1160 *dev = video_drvdata(file); 593 594 if (i > STK1160_MAX_INPUT) 595 return -EINVAL; 596 597 dev->ctl_input = i; 598 599 stk1160_select_input(dev); 600 601 return 0; 602 } 603 604 #ifdef CONFIG_VIDEO_ADV_DEBUG 605 static int vidioc_g_register(struct file *file, void *priv, 606 struct v4l2_dbg_register *reg) 607 { 608 struct stk1160 *dev = video_drvdata(file); 609 int rc; 610 u8 val; 611 612 /* Match host */ 613 rc = stk1160_read_reg(dev, reg->reg, &val); 614 reg->val = val; 615 reg->size = 1; 616 617 return rc; 618 } 619 620 static int vidioc_s_register(struct file *file, void *priv, 621 const struct v4l2_dbg_register *reg) 622 { 623 struct stk1160 *dev = video_drvdata(file); 624 625 /* Match host */ 626 return stk1160_write_reg(dev, reg->reg, reg->val); 627 } 628 #endif 629 630 static const struct v4l2_ioctl_ops stk1160_ioctl_ops = { 631 .vidioc_querycap = vidioc_querycap, 632 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 633 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 634 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 635 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 636 .vidioc_querystd = vidioc_querystd, 637 .vidioc_g_std = vidioc_g_std, 638 .vidioc_s_std = vidioc_s_std, 639 .vidioc_enum_input = vidioc_enum_input, 640 .vidioc_g_input = vidioc_g_input, 641 .vidioc_s_input = vidioc_s_input, 642 643 /* vb2 takes care of these */ 644 .vidioc_reqbufs = vb2_ioctl_reqbufs, 645 .vidioc_querybuf = vb2_ioctl_querybuf, 646 .vidioc_qbuf = vb2_ioctl_qbuf, 647 .vidioc_dqbuf = vb2_ioctl_dqbuf, 648 .vidioc_streamon = vb2_ioctl_streamon, 649 .vidioc_streamoff = vb2_ioctl_streamoff, 650 .vidioc_expbuf = vb2_ioctl_expbuf, 651 652 .vidioc_log_status = v4l2_ctrl_log_status, 653 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 654 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 655 656 #ifdef CONFIG_VIDEO_ADV_DEBUG 657 .vidioc_g_register = vidioc_g_register, 658 .vidioc_s_register = vidioc_s_register, 659 #endif 660 }; 661 662 /********************************************************************/ 663 664 /* 665 * Videobuf2 operations 666 */ 667 static int queue_setup(struct vb2_queue *vq, 668 unsigned int *nbuffers, unsigned int *nplanes, 669 unsigned int sizes[], struct device *alloc_devs[]) 670 { 671 struct stk1160 *dev = vb2_get_drv_priv(vq); 672 unsigned long size; 673 674 size = dev->width * dev->height * 2; 675 676 /* 677 * Here we can change the number of buffers being requested. 678 * So, we set a minimum and a maximum like this: 679 */ 680 *nbuffers = clamp_t(unsigned int, *nbuffers, 681 STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS); 682 683 if (*nplanes) 684 return sizes[0] < size ? -EINVAL : 0; 685 686 /* This means a packed colorformat */ 687 *nplanes = 1; 688 689 sizes[0] = size; 690 691 stk1160_dbg("%s: buffer count %d, each %ld bytes\n", 692 __func__, *nbuffers, size); 693 694 return 0; 695 } 696 697 static void buffer_queue(struct vb2_buffer *vb) 698 { 699 unsigned long flags; 700 struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue); 701 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 702 struct stk1160_buffer *buf = 703 container_of(vbuf, struct stk1160_buffer, vb); 704 705 spin_lock_irqsave(&dev->buf_lock, flags); 706 if (!dev->udev) { 707 /* 708 * If the device is disconnected return the buffer to userspace 709 * directly. The next QBUF call will fail with -ENODEV. 710 */ 711 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 712 } else { 713 714 buf->mem = vb2_plane_vaddr(vb, 0); 715 buf->length = vb2_plane_size(vb, 0); 716 buf->bytesused = 0; 717 buf->pos = 0; 718 719 /* 720 * If buffer length is less from expected then we return 721 * the buffer to userspace directly. 722 */ 723 if (buf->length < dev->width * dev->height * 2) 724 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 725 else 726 list_add_tail(&buf->list, &dev->avail_bufs); 727 728 } 729 spin_unlock_irqrestore(&dev->buf_lock, flags); 730 } 731 732 static int start_streaming(struct vb2_queue *vq, unsigned int count) 733 { 734 struct stk1160 *dev = vb2_get_drv_priv(vq); 735 return stk1160_start_streaming(dev); 736 } 737 738 /* abort streaming and wait for last buffer */ 739 static void stop_streaming(struct vb2_queue *vq) 740 { 741 struct stk1160 *dev = vb2_get_drv_priv(vq); 742 stk1160_stop_streaming(dev); 743 } 744 745 static const struct vb2_ops stk1160_video_qops = { 746 .queue_setup = queue_setup, 747 .buf_queue = buffer_queue, 748 .start_streaming = start_streaming, 749 .stop_streaming = stop_streaming, 750 .wait_prepare = vb2_ops_wait_prepare, 751 .wait_finish = vb2_ops_wait_finish, 752 }; 753 754 static struct video_device v4l_template = { 755 .name = "stk1160", 756 .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50, 757 .fops = &stk1160_fops, 758 .ioctl_ops = &stk1160_ioctl_ops, 759 .release = video_device_release_empty, 760 }; 761 762 /********************************************************************/ 763 764 /* Must be called with both v4l_lock and vb_queue_lock hold */ 765 void stk1160_clear_queue(struct stk1160 *dev) 766 { 767 struct stk1160_buffer *buf; 768 unsigned long flags; 769 770 /* Release all active buffers */ 771 spin_lock_irqsave(&dev->buf_lock, flags); 772 while (!list_empty(&dev->avail_bufs)) { 773 buf = list_first_entry(&dev->avail_bufs, 774 struct stk1160_buffer, list); 775 list_del(&buf->list); 776 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 777 stk1160_dbg("buffer [%p/%d] aborted\n", 778 buf, buf->vb.vb2_buf.index); 779 } 780 781 /* It's important to release the current buffer */ 782 if (dev->isoc_ctl.buf) { 783 buf = dev->isoc_ctl.buf; 784 dev->isoc_ctl.buf = NULL; 785 786 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 787 stk1160_dbg("buffer [%p/%d] aborted\n", 788 buf, buf->vb.vb2_buf.index); 789 } 790 spin_unlock_irqrestore(&dev->buf_lock, flags); 791 } 792 793 int stk1160_vb2_setup(struct stk1160 *dev) 794 { 795 int rc; 796 struct vb2_queue *q; 797 798 q = &dev->vb_vidq; 799 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 800 q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 801 q->drv_priv = dev; 802 q->buf_struct_size = sizeof(struct stk1160_buffer); 803 q->ops = &stk1160_video_qops; 804 q->mem_ops = &vb2_vmalloc_memops; 805 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 806 807 rc = vb2_queue_init(q); 808 if (rc < 0) 809 return rc; 810 811 /* initialize video dma queue */ 812 INIT_LIST_HEAD(&dev->avail_bufs); 813 814 return 0; 815 } 816 817 int stk1160_video_register(struct stk1160 *dev) 818 { 819 int rc; 820 821 /* Initialize video_device with a template structure */ 822 dev->vdev = v4l_template; 823 dev->vdev.queue = &dev->vb_vidq; 824 825 /* 826 * Provide mutexes for v4l2 core and for videobuf2 queue. 827 * It will be used to protect *only* v4l2 ioctls. 828 */ 829 dev->vdev.lock = &dev->v4l_lock; 830 dev->vdev.queue->lock = &dev->vb_queue_lock; 831 832 /* This will be used to set video_device parent */ 833 dev->vdev.v4l2_dev = &dev->v4l2_dev; 834 835 /* NTSC is default */ 836 dev->norm = V4L2_STD_NTSC_M; 837 dev->width = 720; 838 dev->height = 480; 839 840 /* set default format */ 841 dev->fmt = &format[0]; 842 stk1160_set_std(dev); 843 844 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std, 845 dev->norm); 846 847 video_set_drvdata(&dev->vdev, dev); 848 rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1); 849 if (rc < 0) { 850 stk1160_err("video_register_device failed (%d)\n", rc); 851 return rc; 852 } 853 854 v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n", 855 video_device_node_name(&dev->vdev)); 856 857 return 0; 858 } 859