1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * STK1160 driver 4 * 5 * Copyright (C) 2012 Ezequiel Garcia 6 * <elezegarcia--a.t--gmail.com> 7 * 8 * Based on Easycap driver by R.M. Thomas 9 * Copyright (C) 2010 R.M. Thomas 10 * <rmthomas--a.t--sciolus.org> 11 */ 12 13 #include <linux/module.h> 14 #include <linux/usb.h> 15 #include <linux/mm.h> 16 #include <linux/slab.h> 17 18 #include <linux/videodev2.h> 19 #include <media/v4l2-device.h> 20 #include <media/v4l2-common.h> 21 #include <media/v4l2-ioctl.h> 22 #include <media/v4l2-fh.h> 23 #include <media/v4l2-event.h> 24 #include <media/videobuf2-vmalloc.h> 25 26 #include <media/i2c/saa7115.h> 27 28 #include "stk1160.h" 29 #include "stk1160-reg.h" 30 31 static bool keep_buffers; 32 module_param(keep_buffers, bool, 0644); 33 MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming"); 34 35 enum stk1160_decimate_mode { 36 STK1160_DECIMATE_MORE_THAN_HALF, 37 STK1160_DECIMATE_LESS_THAN_HALF, 38 }; 39 40 struct stk1160_decimate_ctrl { 41 bool col_en, row_en; 42 enum stk1160_decimate_mode col_mode, row_mode; 43 unsigned int col_n, row_n; 44 }; 45 46 /* supported video standards */ 47 static struct stk1160_fmt format[] = { 48 { 49 .name = "16 bpp YUY2, 4:2:2, packed", 50 .fourcc = V4L2_PIX_FMT_UYVY, 51 .depth = 16, 52 } 53 }; 54 55 /* 56 * Helper to find the next divisor that results in modulo being zero. 57 * This is required to guarantee valid decimation unit counts. 58 */ 59 static unsigned int 60 div_round_integer(unsigned int x, unsigned int y) 61 { 62 for (;; y++) { 63 if (x % y == 0) 64 return x / y; 65 } 66 } 67 68 static void stk1160_set_std(struct stk1160 *dev) 69 { 70 int i; 71 72 static struct regval std525[] = { 73 74 /* 720x480 */ 75 76 /* Frame start */ 77 {STK116_CFSPO_STX_L, 0x0000}, 78 {STK116_CFSPO_STX_H, 0x0000}, 79 {STK116_CFSPO_STY_L, 0x0003}, 80 {STK116_CFSPO_STY_H, 0x0000}, 81 82 /* Frame end */ 83 {STK116_CFEPO_ENX_L, 0x05a0}, 84 {STK116_CFEPO_ENX_H, 0x0005}, 85 {STK116_CFEPO_ENY_L, 0x00f3}, 86 {STK116_CFEPO_ENY_H, 0x0000}, 87 88 {0xffff, 0xffff} 89 }; 90 91 static struct regval std625[] = { 92 93 /* 720x576 */ 94 95 /* TODO: Each line of frame has some junk at the end */ 96 /* Frame start */ 97 {STK116_CFSPO, 0x0000}, 98 {STK116_CFSPO+1, 0x0000}, 99 {STK116_CFSPO+2, 0x0001}, 100 {STK116_CFSPO+3, 0x0000}, 101 102 /* Frame end */ 103 {STK116_CFEPO, 0x05a0}, 104 {STK116_CFEPO+1, 0x0005}, 105 {STK116_CFEPO+2, 0x0121}, 106 {STK116_CFEPO+3, 0x0001}, 107 108 {0xffff, 0xffff} 109 }; 110 111 if (dev->norm & V4L2_STD_525_60) { 112 stk1160_dbg("registers to NTSC like standard\n"); 113 for (i = 0; std525[i].reg != 0xffff; i++) 114 stk1160_write_reg(dev, std525[i].reg, std525[i].val); 115 } else { 116 stk1160_dbg("registers to PAL like standard\n"); 117 for (i = 0; std625[i].reg != 0xffff; i++) 118 stk1160_write_reg(dev, std625[i].reg, std625[i].val); 119 } 120 121 } 122 123 static void stk1160_set_fmt(struct stk1160 *dev, 124 struct stk1160_decimate_ctrl *ctrl) 125 { 126 u32 val = 0; 127 128 if (ctrl) { 129 /* 130 * Since the format is UYVY, the device must skip or send 131 * a number of rows/columns multiple of four. This way, the 132 * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit 133 * does exactly this. 134 */ 135 val |= STK1160_DEC_UNIT_SIZE; 136 val |= ctrl->col_en ? STK1160_H_DEC_EN : 0; 137 val |= ctrl->row_en ? STK1160_V_DEC_EN : 0; 138 val |= ctrl->col_mode == 139 STK1160_DECIMATE_MORE_THAN_HALF ? 140 STK1160_H_DEC_MODE : 0; 141 val |= ctrl->row_mode == 142 STK1160_DECIMATE_MORE_THAN_HALF ? 143 STK1160_V_DEC_MODE : 0; 144 145 /* Horizontal count units */ 146 stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n); 147 /* Vertical count units */ 148 stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n); 149 150 stk1160_dbg("decimate 0x%x, column units %d, row units %d\n", 151 val, ctrl->col_n, ctrl->row_n); 152 } 153 154 /* Decimation control */ 155 stk1160_write_reg(dev, STK1160_DMCTRL, val); 156 } 157 158 /* 159 * Set a new alternate setting. 160 * Returns true is dev->max_pkt_size has changed, false otherwise. 161 */ 162 static bool stk1160_set_alternate(struct stk1160 *dev) 163 { 164 int i, prev_alt = dev->alt; 165 unsigned int min_pkt_size; 166 bool new_pkt_size; 167 168 /* 169 * If we don't set right alternate, 170 * then we will get a green screen with junk. 171 */ 172 min_pkt_size = STK1160_MIN_PKT_SIZE; 173 174 for (i = 0; i < dev->num_alt; i++) { 175 /* stop when the selected alt setting offers enough bandwidth */ 176 if (dev->alt_max_pkt_size[i] >= min_pkt_size) { 177 dev->alt = i; 178 break; 179 /* 180 * otherwise make sure that we end up with the maximum bandwidth 181 * because the min_pkt_size equation might be wrong... 182 */ 183 } else if (dev->alt_max_pkt_size[i] > 184 dev->alt_max_pkt_size[dev->alt]) 185 dev->alt = i; 186 } 187 188 stk1160_dbg("setting alternate %d\n", dev->alt); 189 190 if (dev->alt != prev_alt) { 191 stk1160_dbg("minimum isoc packet size: %u (alt=%d)\n", 192 min_pkt_size, dev->alt); 193 stk1160_dbg("setting alt %d with wMaxPacketSize=%u\n", 194 dev->alt, dev->alt_max_pkt_size[dev->alt]); 195 usb_set_interface(dev->udev, 0, dev->alt); 196 } 197 198 new_pkt_size = dev->max_pkt_size != dev->alt_max_pkt_size[dev->alt]; 199 dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt]; 200 201 return new_pkt_size; 202 } 203 204 static int stk1160_start_streaming(struct stk1160 *dev) 205 { 206 bool new_pkt_size; 207 int rc = 0; 208 int i; 209 210 /* Check device presence */ 211 if (!dev->udev) 212 return -ENODEV; 213 214 if (mutex_lock_interruptible(&dev->v4l_lock)) 215 return -ERESTARTSYS; 216 /* 217 * For some reason it is mandatory to set alternate *first* 218 * and only *then* initialize isoc urbs. 219 * Someone please explain me why ;) 220 */ 221 new_pkt_size = stk1160_set_alternate(dev); 222 223 /* 224 * We (re)allocate isoc urbs if: 225 * there is no allocated isoc urbs, OR 226 * a new dev->max_pkt_size is detected 227 */ 228 if (!dev->isoc_ctl.num_bufs || new_pkt_size) { 229 rc = stk1160_alloc_isoc(dev); 230 if (rc < 0) 231 goto out_stop_hw; 232 } 233 234 /* submit urbs and enables IRQ */ 235 for (i = 0; i < dev->isoc_ctl.num_bufs; i++) { 236 rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_KERNEL); 237 if (rc) { 238 stk1160_err("cannot submit urb[%d] (%d)\n", i, rc); 239 goto out_uninit; 240 } 241 } 242 243 /* Start saa711x */ 244 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1); 245 246 dev->sequence = 0; 247 248 /* Start stk1160 */ 249 stk1160_write_reg(dev, STK1160_DCTRL, 0xb3); 250 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00); 251 252 stk1160_dbg("streaming started\n"); 253 254 mutex_unlock(&dev->v4l_lock); 255 256 return 0; 257 258 out_uninit: 259 stk1160_uninit_isoc(dev); 260 out_stop_hw: 261 usb_set_interface(dev->udev, 0, 0); 262 stk1160_clear_queue(dev); 263 264 mutex_unlock(&dev->v4l_lock); 265 266 return rc; 267 } 268 269 /* Must be called with v4l_lock hold */ 270 static void stk1160_stop_hw(struct stk1160 *dev) 271 { 272 /* If the device is not physically present, there is nothing to do */ 273 if (!dev->udev) 274 return; 275 276 /* set alternate 0 */ 277 dev->alt = 0; 278 stk1160_dbg("setting alternate %d\n", dev->alt); 279 usb_set_interface(dev->udev, 0, 0); 280 281 /* Stop stk1160 */ 282 stk1160_write_reg(dev, STK1160_DCTRL, 0x00); 283 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00); 284 285 /* Stop saa711x */ 286 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0); 287 } 288 289 static int stk1160_stop_streaming(struct stk1160 *dev) 290 { 291 if (mutex_lock_interruptible(&dev->v4l_lock)) 292 return -ERESTARTSYS; 293 294 /* 295 * Once URBs are cancelled, the URB complete handler 296 * won't be running. This is required to safely release the 297 * current buffer (dev->isoc_ctl.buf). 298 */ 299 stk1160_cancel_isoc(dev); 300 301 /* 302 * It is possible to keep buffers around using a module parameter. 303 * This is intended to avoid memory fragmentation. 304 */ 305 if (!keep_buffers) 306 stk1160_free_isoc(dev); 307 308 stk1160_stop_hw(dev); 309 310 stk1160_clear_queue(dev); 311 312 stk1160_dbg("streaming stopped\n"); 313 314 mutex_unlock(&dev->v4l_lock); 315 316 return 0; 317 } 318 319 static const struct v4l2_file_operations stk1160_fops = { 320 .owner = THIS_MODULE, 321 .open = v4l2_fh_open, 322 .release = vb2_fop_release, 323 .read = vb2_fop_read, 324 .poll = vb2_fop_poll, 325 .mmap = vb2_fop_mmap, 326 .unlocked_ioctl = video_ioctl2, 327 }; 328 329 /* 330 * vidioc ioctls 331 */ 332 static int vidioc_querycap(struct file *file, 333 void *priv, struct v4l2_capability *cap) 334 { 335 struct stk1160 *dev = video_drvdata(file); 336 337 strscpy(cap->driver, "stk1160", sizeof(cap->driver)); 338 strscpy(cap->card, "stk1160", sizeof(cap->card)); 339 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info)); 340 return 0; 341 } 342 343 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 344 struct v4l2_fmtdesc *f) 345 { 346 if (f->index != 0) 347 return -EINVAL; 348 349 strscpy(f->description, format[f->index].name, sizeof(f->description)); 350 f->pixelformat = format[f->index].fourcc; 351 return 0; 352 } 353 354 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 355 struct v4l2_format *f) 356 { 357 struct stk1160 *dev = video_drvdata(file); 358 359 f->fmt.pix.width = dev->width; 360 f->fmt.pix.height = dev->height; 361 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 362 f->fmt.pix.pixelformat = dev->fmt->fourcc; 363 f->fmt.pix.bytesperline = dev->width * 2; 364 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline; 365 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 366 367 return 0; 368 } 369 370 static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f, 371 struct stk1160_decimate_ctrl *ctrl) 372 { 373 unsigned int width, height; 374 unsigned int base_width, base_height; 375 unsigned int col_n, row_n; 376 enum stk1160_decimate_mode col_mode, row_mode; 377 bool col_en, row_en; 378 379 base_width = 720; 380 base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576; 381 382 /* Minimum width and height is 5% the frame size */ 383 width = clamp_t(unsigned int, f->fmt.pix.width, 384 base_width / 20, base_width); 385 height = clamp_t(unsigned int, f->fmt.pix.height, 386 base_height / 20, base_height); 387 388 /* Let's set default no decimation values */ 389 col_n = 0; 390 row_n = 0; 391 col_en = false; 392 row_en = false; 393 f->fmt.pix.width = base_width; 394 f->fmt.pix.height = base_height; 395 row_mode = STK1160_DECIMATE_LESS_THAN_HALF; 396 col_mode = STK1160_DECIMATE_LESS_THAN_HALF; 397 398 if (width < base_width && width > base_width / 2) { 399 /* 400 * The device will send count units for each 401 * unit skipped. This means count unit is: 402 * 403 * n = width / (frame width - width) 404 * 405 * And the width is: 406 * 407 * width = (n / n + 1) * frame width 408 */ 409 col_n = div_round_integer(width, base_width - width); 410 if (col_n > 0 && col_n <= 255) { 411 col_en = true; 412 col_mode = STK1160_DECIMATE_LESS_THAN_HALF; 413 f->fmt.pix.width = (base_width * col_n) / (col_n + 1); 414 } 415 416 } else if (width <= base_width / 2) { 417 418 /* 419 * The device will skip count units for each 420 * unit sent. This means count is: 421 * 422 * n = (frame width / width) - 1 423 * 424 * And the width is: 425 * 426 * width = frame width / (n + 1) 427 */ 428 col_n = div_round_integer(base_width, width) - 1; 429 if (col_n > 0 && col_n <= 255) { 430 col_en = true; 431 col_mode = STK1160_DECIMATE_MORE_THAN_HALF; 432 f->fmt.pix.width = base_width / (col_n + 1); 433 } 434 } 435 436 if (height < base_height && height > base_height / 2) { 437 row_n = div_round_integer(height, base_height - height); 438 if (row_n > 0 && row_n <= 255) { 439 row_en = true; 440 row_mode = STK1160_DECIMATE_LESS_THAN_HALF; 441 f->fmt.pix.height = (base_height * row_n) / (row_n + 1); 442 } 443 444 } else if (height <= base_height / 2) { 445 row_n = div_round_integer(base_height, height) - 1; 446 if (row_n > 0 && row_n <= 255) { 447 row_en = true; 448 row_mode = STK1160_DECIMATE_MORE_THAN_HALF; 449 f->fmt.pix.height = base_height / (row_n + 1); 450 } 451 } 452 453 f->fmt.pix.pixelformat = dev->fmt->fourcc; 454 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 455 f->fmt.pix.bytesperline = f->fmt.pix.width * 2; 456 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; 457 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 458 459 if (ctrl) { 460 ctrl->col_en = col_en; 461 ctrl->col_n = col_n; 462 ctrl->col_mode = col_mode; 463 ctrl->row_en = row_en; 464 ctrl->row_n = row_n; 465 ctrl->row_mode = row_mode; 466 } 467 468 stk1160_dbg("width %d, height %d\n", 469 f->fmt.pix.width, f->fmt.pix.height); 470 return 0; 471 } 472 473 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, 474 struct v4l2_format *f) 475 { 476 struct stk1160 *dev = video_drvdata(file); 477 478 return stk1160_try_fmt(dev, f, NULL); 479 } 480 481 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 482 struct v4l2_format *f) 483 { 484 struct stk1160 *dev = video_drvdata(file); 485 struct vb2_queue *q = &dev->vb_vidq; 486 struct stk1160_decimate_ctrl ctrl; 487 int rc; 488 489 if (vb2_is_busy(q)) 490 return -EBUSY; 491 492 rc = stk1160_try_fmt(dev, f, &ctrl); 493 if (rc < 0) 494 return rc; 495 dev->width = f->fmt.pix.width; 496 dev->height = f->fmt.pix.height; 497 stk1160_set_fmt(dev, &ctrl); 498 499 return 0; 500 } 501 502 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm) 503 { 504 struct stk1160 *dev = video_drvdata(file); 505 v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm); 506 return 0; 507 } 508 509 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm) 510 { 511 struct stk1160 *dev = video_drvdata(file); 512 513 *norm = dev->norm; 514 return 0; 515 } 516 517 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm) 518 { 519 struct stk1160 *dev = video_drvdata(file); 520 struct vb2_queue *q = &dev->vb_vidq; 521 522 if (dev->norm == norm) 523 return 0; 524 525 if (vb2_is_busy(q)) 526 return -EBUSY; 527 528 /* Check device presence */ 529 if (!dev->udev) 530 return -ENODEV; 531 532 /* We need to set this now, before we call stk1160_set_std */ 533 dev->width = 720; 534 dev->height = (norm & V4L2_STD_525_60) ? 480 : 576; 535 dev->norm = norm; 536 537 stk1160_set_std(dev); 538 539 /* Calling with NULL disables frame decimation */ 540 stk1160_set_fmt(dev, NULL); 541 542 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std, 543 dev->norm); 544 545 return 0; 546 } 547 548 549 static int vidioc_enum_input(struct file *file, void *priv, 550 struct v4l2_input *i) 551 { 552 struct stk1160 *dev = video_drvdata(file); 553 554 if (i->index > STK1160_MAX_INPUT) 555 return -EINVAL; 556 557 /* S-Video special handling */ 558 if (i->index == STK1160_SVIDEO_INPUT) 559 sprintf(i->name, "S-Video"); 560 else 561 sprintf(i->name, "Composite%d", i->index); 562 563 i->type = V4L2_INPUT_TYPE_CAMERA; 564 i->std = dev->vdev.tvnorms; 565 return 0; 566 } 567 568 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i) 569 { 570 struct stk1160 *dev = video_drvdata(file); 571 *i = dev->ctl_input; 572 return 0; 573 } 574 575 static int vidioc_s_input(struct file *file, void *priv, unsigned int i) 576 { 577 struct stk1160 *dev = video_drvdata(file); 578 579 if (i > STK1160_MAX_INPUT) 580 return -EINVAL; 581 582 dev->ctl_input = i; 583 584 stk1160_select_input(dev); 585 586 return 0; 587 } 588 589 #ifdef CONFIG_VIDEO_ADV_DEBUG 590 static int vidioc_g_register(struct file *file, void *priv, 591 struct v4l2_dbg_register *reg) 592 { 593 struct stk1160 *dev = video_drvdata(file); 594 int rc; 595 u8 val; 596 597 /* Match host */ 598 rc = stk1160_read_reg(dev, reg->reg, &val); 599 reg->val = val; 600 reg->size = 1; 601 602 return rc; 603 } 604 605 static int vidioc_s_register(struct file *file, void *priv, 606 const struct v4l2_dbg_register *reg) 607 { 608 struct stk1160 *dev = video_drvdata(file); 609 610 /* Match host */ 611 return stk1160_write_reg(dev, reg->reg, reg->val); 612 } 613 #endif 614 615 static const struct v4l2_ioctl_ops stk1160_ioctl_ops = { 616 .vidioc_querycap = vidioc_querycap, 617 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 618 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 619 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 620 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 621 .vidioc_querystd = vidioc_querystd, 622 .vidioc_g_std = vidioc_g_std, 623 .vidioc_s_std = vidioc_s_std, 624 .vidioc_enum_input = vidioc_enum_input, 625 .vidioc_g_input = vidioc_g_input, 626 .vidioc_s_input = vidioc_s_input, 627 628 /* vb2 takes care of these */ 629 .vidioc_reqbufs = vb2_ioctl_reqbufs, 630 .vidioc_querybuf = vb2_ioctl_querybuf, 631 .vidioc_qbuf = vb2_ioctl_qbuf, 632 .vidioc_dqbuf = vb2_ioctl_dqbuf, 633 .vidioc_streamon = vb2_ioctl_streamon, 634 .vidioc_streamoff = vb2_ioctl_streamoff, 635 .vidioc_expbuf = vb2_ioctl_expbuf, 636 637 .vidioc_log_status = v4l2_ctrl_log_status, 638 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 639 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 640 641 #ifdef CONFIG_VIDEO_ADV_DEBUG 642 .vidioc_g_register = vidioc_g_register, 643 .vidioc_s_register = vidioc_s_register, 644 #endif 645 }; 646 647 /********************************************************************/ 648 649 /* 650 * Videobuf2 operations 651 */ 652 static int queue_setup(struct vb2_queue *vq, 653 unsigned int *nbuffers, unsigned int *nplanes, 654 unsigned int sizes[], struct device *alloc_devs[]) 655 { 656 struct stk1160 *dev = vb2_get_drv_priv(vq); 657 unsigned long size; 658 659 size = dev->width * dev->height * 2; 660 661 /* 662 * Here we can change the number of buffers being requested. 663 * So, we set a minimum and a maximum like this: 664 */ 665 *nbuffers = clamp_t(unsigned int, *nbuffers, 666 STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS); 667 668 if (*nplanes) 669 return sizes[0] < size ? -EINVAL : 0; 670 671 /* This means a packed colorformat */ 672 *nplanes = 1; 673 674 sizes[0] = size; 675 676 stk1160_dbg("%s: buffer count %d, each %ld bytes\n", 677 __func__, *nbuffers, size); 678 679 return 0; 680 } 681 682 static void buffer_queue(struct vb2_buffer *vb) 683 { 684 unsigned long flags; 685 struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue); 686 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 687 struct stk1160_buffer *buf = 688 container_of(vbuf, struct stk1160_buffer, vb); 689 690 spin_lock_irqsave(&dev->buf_lock, flags); 691 if (!dev->udev) { 692 /* 693 * If the device is disconnected return the buffer to userspace 694 * directly. The next QBUF call will fail with -ENODEV. 695 */ 696 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 697 } else { 698 699 buf->mem = vb2_plane_vaddr(vb, 0); 700 buf->length = vb2_plane_size(vb, 0); 701 buf->bytesused = 0; 702 buf->pos = 0; 703 704 /* 705 * If buffer length is less from expected then we return 706 * the buffer to userspace directly. 707 */ 708 if (buf->length < dev->width * dev->height * 2) 709 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 710 else 711 list_add_tail(&buf->list, &dev->avail_bufs); 712 713 } 714 spin_unlock_irqrestore(&dev->buf_lock, flags); 715 } 716 717 static int start_streaming(struct vb2_queue *vq, unsigned int count) 718 { 719 struct stk1160 *dev = vb2_get_drv_priv(vq); 720 return stk1160_start_streaming(dev); 721 } 722 723 /* abort streaming and wait for last buffer */ 724 static void stop_streaming(struct vb2_queue *vq) 725 { 726 struct stk1160 *dev = vb2_get_drv_priv(vq); 727 stk1160_stop_streaming(dev); 728 } 729 730 static const struct vb2_ops stk1160_video_qops = { 731 .queue_setup = queue_setup, 732 .buf_queue = buffer_queue, 733 .start_streaming = start_streaming, 734 .stop_streaming = stop_streaming, 735 .wait_prepare = vb2_ops_wait_prepare, 736 .wait_finish = vb2_ops_wait_finish, 737 }; 738 739 static const struct video_device v4l_template = { 740 .name = "stk1160", 741 .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50, 742 .fops = &stk1160_fops, 743 .ioctl_ops = &stk1160_ioctl_ops, 744 .release = video_device_release_empty, 745 }; 746 747 /********************************************************************/ 748 749 /* Must be called with both v4l_lock and vb_queue_lock hold */ 750 void stk1160_clear_queue(struct stk1160 *dev) 751 { 752 struct stk1160_buffer *buf; 753 unsigned long flags; 754 755 /* Release all active buffers */ 756 spin_lock_irqsave(&dev->buf_lock, flags); 757 while (!list_empty(&dev->avail_bufs)) { 758 buf = list_first_entry(&dev->avail_bufs, 759 struct stk1160_buffer, list); 760 list_del(&buf->list); 761 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 762 stk1160_dbg("buffer [%p/%d] aborted\n", 763 buf, buf->vb.vb2_buf.index); 764 } 765 766 /* It's important to release the current buffer */ 767 if (dev->isoc_ctl.buf) { 768 buf = dev->isoc_ctl.buf; 769 dev->isoc_ctl.buf = NULL; 770 771 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 772 stk1160_dbg("buffer [%p/%d] aborted\n", 773 buf, buf->vb.vb2_buf.index); 774 } 775 spin_unlock_irqrestore(&dev->buf_lock, flags); 776 } 777 778 int stk1160_vb2_setup(struct stk1160 *dev) 779 { 780 int rc; 781 struct vb2_queue *q; 782 783 q = &dev->vb_vidq; 784 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 785 q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 786 q->drv_priv = dev; 787 q->buf_struct_size = sizeof(struct stk1160_buffer); 788 q->ops = &stk1160_video_qops; 789 q->mem_ops = &vb2_vmalloc_memops; 790 q->lock = &dev->vb_queue_lock; 791 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 792 793 rc = vb2_queue_init(q); 794 if (rc < 0) 795 return rc; 796 797 /* initialize video dma queue */ 798 INIT_LIST_HEAD(&dev->avail_bufs); 799 800 return 0; 801 } 802 803 int stk1160_video_register(struct stk1160 *dev) 804 { 805 int rc; 806 807 /* Initialize video_device with a template structure */ 808 dev->vdev = v4l_template; 809 dev->vdev.queue = &dev->vb_vidq; 810 811 /* 812 * Provide mutexes for v4l2 core and for videobuf2 queue. 813 * It will be used to protect *only* v4l2 ioctls. 814 */ 815 dev->vdev.lock = &dev->v4l_lock; 816 817 /* This will be used to set video_device parent */ 818 dev->vdev.v4l2_dev = &dev->v4l2_dev; 819 dev->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING | 820 V4L2_CAP_READWRITE; 821 822 /* NTSC is default */ 823 dev->norm = V4L2_STD_NTSC_M; 824 dev->width = 720; 825 dev->height = 480; 826 827 /* set default format */ 828 dev->fmt = &format[0]; 829 stk1160_set_std(dev); 830 831 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std, 832 dev->norm); 833 834 video_set_drvdata(&dev->vdev, dev); 835 rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1); 836 if (rc < 0) { 837 stk1160_err("video_register_device failed (%d)\n", rc); 838 return rc; 839 } 840 841 v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n", 842 video_device_node_name(&dev->vdev)); 843 844 return 0; 845 } 846