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 cap->device_caps = 341 V4L2_CAP_VIDEO_CAPTURE | 342 V4L2_CAP_STREAMING | 343 V4L2_CAP_READWRITE; 344 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS; 345 return 0; 346 } 347 348 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 349 struct v4l2_fmtdesc *f) 350 { 351 if (f->index != 0) 352 return -EINVAL; 353 354 strscpy(f->description, format[f->index].name, sizeof(f->description)); 355 f->pixelformat = format[f->index].fourcc; 356 return 0; 357 } 358 359 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 360 struct v4l2_format *f) 361 { 362 struct stk1160 *dev = video_drvdata(file); 363 364 f->fmt.pix.width = dev->width; 365 f->fmt.pix.height = dev->height; 366 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 367 f->fmt.pix.pixelformat = dev->fmt->fourcc; 368 f->fmt.pix.bytesperline = dev->width * 2; 369 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline; 370 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 371 372 return 0; 373 } 374 375 static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f, 376 struct stk1160_decimate_ctrl *ctrl) 377 { 378 unsigned int width, height; 379 unsigned int base_width, base_height; 380 unsigned int col_n, row_n; 381 enum stk1160_decimate_mode col_mode, row_mode; 382 bool col_en, row_en; 383 384 base_width = 720; 385 base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576; 386 387 /* Minimum width and height is 5% the frame size */ 388 width = clamp_t(unsigned int, f->fmt.pix.width, 389 base_width / 20, base_width); 390 height = clamp_t(unsigned int, f->fmt.pix.height, 391 base_height / 20, base_height); 392 393 /* Let's set default no decimation values */ 394 col_n = 0; 395 row_n = 0; 396 col_en = false; 397 row_en = false; 398 f->fmt.pix.width = base_width; 399 f->fmt.pix.height = base_height; 400 row_mode = STK1160_DECIMATE_LESS_THAN_HALF; 401 col_mode = STK1160_DECIMATE_LESS_THAN_HALF; 402 403 if (width < base_width && width > base_width / 2) { 404 /* 405 * The device will send count units for each 406 * unit skipped. This means count unit is: 407 * 408 * n = width / (frame width - width) 409 * 410 * And the width is: 411 * 412 * width = (n / n + 1) * frame width 413 */ 414 col_n = div_round_integer(width, base_width - width); 415 if (col_n > 0 && col_n <= 255) { 416 col_en = true; 417 col_mode = STK1160_DECIMATE_LESS_THAN_HALF; 418 f->fmt.pix.width = (base_width * col_n) / (col_n + 1); 419 } 420 421 } else if (width <= base_width / 2) { 422 423 /* 424 * The device will skip count units for each 425 * unit sent. This means count is: 426 * 427 * n = (frame width / width) - 1 428 * 429 * And the width is: 430 * 431 * width = frame width / (n + 1) 432 */ 433 col_n = div_round_integer(base_width, width) - 1; 434 if (col_n > 0 && col_n <= 255) { 435 col_en = true; 436 col_mode = STK1160_DECIMATE_MORE_THAN_HALF; 437 f->fmt.pix.width = base_width / (col_n + 1); 438 } 439 } 440 441 if (height < base_height && height > base_height / 2) { 442 row_n = div_round_integer(height, base_height - height); 443 if (row_n > 0 && row_n <= 255) { 444 row_en = true; 445 row_mode = STK1160_DECIMATE_LESS_THAN_HALF; 446 f->fmt.pix.height = (base_height * row_n) / (row_n + 1); 447 } 448 449 } else if (height <= base_height / 2) { 450 row_n = div_round_integer(base_height, height) - 1; 451 if (row_n > 0 && row_n <= 255) { 452 row_en = true; 453 row_mode = STK1160_DECIMATE_MORE_THAN_HALF; 454 f->fmt.pix.height = base_height / (row_n + 1); 455 } 456 } 457 458 f->fmt.pix.pixelformat = dev->fmt->fourcc; 459 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 460 f->fmt.pix.bytesperline = f->fmt.pix.width * 2; 461 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; 462 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 463 464 if (ctrl) { 465 ctrl->col_en = col_en; 466 ctrl->col_n = col_n; 467 ctrl->col_mode = col_mode; 468 ctrl->row_en = row_en; 469 ctrl->row_n = row_n; 470 ctrl->row_mode = row_mode; 471 } 472 473 stk1160_dbg("width %d, height %d\n", 474 f->fmt.pix.width, f->fmt.pix.height); 475 return 0; 476 } 477 478 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, 479 struct v4l2_format *f) 480 { 481 struct stk1160 *dev = video_drvdata(file); 482 483 return stk1160_try_fmt(dev, f, NULL); 484 } 485 486 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 487 struct v4l2_format *f) 488 { 489 struct stk1160 *dev = video_drvdata(file); 490 struct vb2_queue *q = &dev->vb_vidq; 491 struct stk1160_decimate_ctrl ctrl; 492 int rc; 493 494 if (vb2_is_busy(q)) 495 return -EBUSY; 496 497 rc = stk1160_try_fmt(dev, f, &ctrl); 498 if (rc < 0) 499 return rc; 500 dev->width = f->fmt.pix.width; 501 dev->height = f->fmt.pix.height; 502 stk1160_set_fmt(dev, &ctrl); 503 504 return 0; 505 } 506 507 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm) 508 { 509 struct stk1160 *dev = video_drvdata(file); 510 v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm); 511 return 0; 512 } 513 514 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm) 515 { 516 struct stk1160 *dev = video_drvdata(file); 517 518 *norm = dev->norm; 519 return 0; 520 } 521 522 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm) 523 { 524 struct stk1160 *dev = video_drvdata(file); 525 struct vb2_queue *q = &dev->vb_vidq; 526 527 if (dev->norm == norm) 528 return 0; 529 530 if (vb2_is_busy(q)) 531 return -EBUSY; 532 533 /* Check device presence */ 534 if (!dev->udev) 535 return -ENODEV; 536 537 /* We need to set this now, before we call stk1160_set_std */ 538 dev->width = 720; 539 dev->height = (norm & V4L2_STD_525_60) ? 480 : 576; 540 dev->norm = norm; 541 542 stk1160_set_std(dev); 543 544 /* Calling with NULL disables frame decimation */ 545 stk1160_set_fmt(dev, NULL); 546 547 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std, 548 dev->norm); 549 550 return 0; 551 } 552 553 554 static int vidioc_enum_input(struct file *file, void *priv, 555 struct v4l2_input *i) 556 { 557 struct stk1160 *dev = video_drvdata(file); 558 559 if (i->index > STK1160_MAX_INPUT) 560 return -EINVAL; 561 562 /* S-Video special handling */ 563 if (i->index == STK1160_SVIDEO_INPUT) 564 sprintf(i->name, "S-Video"); 565 else 566 sprintf(i->name, "Composite%d", i->index); 567 568 i->type = V4L2_INPUT_TYPE_CAMERA; 569 i->std = dev->vdev.tvnorms; 570 return 0; 571 } 572 573 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i) 574 { 575 struct stk1160 *dev = video_drvdata(file); 576 *i = dev->ctl_input; 577 return 0; 578 } 579 580 static int vidioc_s_input(struct file *file, void *priv, unsigned int i) 581 { 582 struct stk1160 *dev = video_drvdata(file); 583 584 if (i > STK1160_MAX_INPUT) 585 return -EINVAL; 586 587 dev->ctl_input = i; 588 589 stk1160_select_input(dev); 590 591 return 0; 592 } 593 594 #ifdef CONFIG_VIDEO_ADV_DEBUG 595 static int vidioc_g_register(struct file *file, void *priv, 596 struct v4l2_dbg_register *reg) 597 { 598 struct stk1160 *dev = video_drvdata(file); 599 int rc; 600 u8 val; 601 602 /* Match host */ 603 rc = stk1160_read_reg(dev, reg->reg, &val); 604 reg->val = val; 605 reg->size = 1; 606 607 return rc; 608 } 609 610 static int vidioc_s_register(struct file *file, void *priv, 611 const struct v4l2_dbg_register *reg) 612 { 613 struct stk1160 *dev = video_drvdata(file); 614 615 /* Match host */ 616 return stk1160_write_reg(dev, reg->reg, reg->val); 617 } 618 #endif 619 620 static const struct v4l2_ioctl_ops stk1160_ioctl_ops = { 621 .vidioc_querycap = vidioc_querycap, 622 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 623 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 624 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 625 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 626 .vidioc_querystd = vidioc_querystd, 627 .vidioc_g_std = vidioc_g_std, 628 .vidioc_s_std = vidioc_s_std, 629 .vidioc_enum_input = vidioc_enum_input, 630 .vidioc_g_input = vidioc_g_input, 631 .vidioc_s_input = vidioc_s_input, 632 633 /* vb2 takes care of these */ 634 .vidioc_reqbufs = vb2_ioctl_reqbufs, 635 .vidioc_querybuf = vb2_ioctl_querybuf, 636 .vidioc_qbuf = vb2_ioctl_qbuf, 637 .vidioc_dqbuf = vb2_ioctl_dqbuf, 638 .vidioc_streamon = vb2_ioctl_streamon, 639 .vidioc_streamoff = vb2_ioctl_streamoff, 640 .vidioc_expbuf = vb2_ioctl_expbuf, 641 642 .vidioc_log_status = v4l2_ctrl_log_status, 643 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 644 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 645 646 #ifdef CONFIG_VIDEO_ADV_DEBUG 647 .vidioc_g_register = vidioc_g_register, 648 .vidioc_s_register = vidioc_s_register, 649 #endif 650 }; 651 652 /********************************************************************/ 653 654 /* 655 * Videobuf2 operations 656 */ 657 static int queue_setup(struct vb2_queue *vq, 658 unsigned int *nbuffers, unsigned int *nplanes, 659 unsigned int sizes[], struct device *alloc_devs[]) 660 { 661 struct stk1160 *dev = vb2_get_drv_priv(vq); 662 unsigned long size; 663 664 size = dev->width * dev->height * 2; 665 666 /* 667 * Here we can change the number of buffers being requested. 668 * So, we set a minimum and a maximum like this: 669 */ 670 *nbuffers = clamp_t(unsigned int, *nbuffers, 671 STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS); 672 673 if (*nplanes) 674 return sizes[0] < size ? -EINVAL : 0; 675 676 /* This means a packed colorformat */ 677 *nplanes = 1; 678 679 sizes[0] = size; 680 681 stk1160_dbg("%s: buffer count %d, each %ld bytes\n", 682 __func__, *nbuffers, size); 683 684 return 0; 685 } 686 687 static void buffer_queue(struct vb2_buffer *vb) 688 { 689 unsigned long flags; 690 struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue); 691 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 692 struct stk1160_buffer *buf = 693 container_of(vbuf, struct stk1160_buffer, vb); 694 695 spin_lock_irqsave(&dev->buf_lock, flags); 696 if (!dev->udev) { 697 /* 698 * If the device is disconnected return the buffer to userspace 699 * directly. The next QBUF call will fail with -ENODEV. 700 */ 701 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 702 } else { 703 704 buf->mem = vb2_plane_vaddr(vb, 0); 705 buf->length = vb2_plane_size(vb, 0); 706 buf->bytesused = 0; 707 buf->pos = 0; 708 709 /* 710 * If buffer length is less from expected then we return 711 * the buffer to userspace directly. 712 */ 713 if (buf->length < dev->width * dev->height * 2) 714 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 715 else 716 list_add_tail(&buf->list, &dev->avail_bufs); 717 718 } 719 spin_unlock_irqrestore(&dev->buf_lock, flags); 720 } 721 722 static int start_streaming(struct vb2_queue *vq, unsigned int count) 723 { 724 struct stk1160 *dev = vb2_get_drv_priv(vq); 725 return stk1160_start_streaming(dev); 726 } 727 728 /* abort streaming and wait for last buffer */ 729 static void stop_streaming(struct vb2_queue *vq) 730 { 731 struct stk1160 *dev = vb2_get_drv_priv(vq); 732 stk1160_stop_streaming(dev); 733 } 734 735 static const struct vb2_ops stk1160_video_qops = { 736 .queue_setup = queue_setup, 737 .buf_queue = buffer_queue, 738 .start_streaming = start_streaming, 739 .stop_streaming = stop_streaming, 740 .wait_prepare = vb2_ops_wait_prepare, 741 .wait_finish = vb2_ops_wait_finish, 742 }; 743 744 static const struct video_device v4l_template = { 745 .name = "stk1160", 746 .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50, 747 .fops = &stk1160_fops, 748 .ioctl_ops = &stk1160_ioctl_ops, 749 .release = video_device_release_empty, 750 }; 751 752 /********************************************************************/ 753 754 /* Must be called with both v4l_lock and vb_queue_lock hold */ 755 void stk1160_clear_queue(struct stk1160 *dev) 756 { 757 struct stk1160_buffer *buf; 758 unsigned long flags; 759 760 /* Release all active buffers */ 761 spin_lock_irqsave(&dev->buf_lock, flags); 762 while (!list_empty(&dev->avail_bufs)) { 763 buf = list_first_entry(&dev->avail_bufs, 764 struct stk1160_buffer, list); 765 list_del(&buf->list); 766 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 767 stk1160_dbg("buffer [%p/%d] aborted\n", 768 buf, buf->vb.vb2_buf.index); 769 } 770 771 /* It's important to release the current buffer */ 772 if (dev->isoc_ctl.buf) { 773 buf = dev->isoc_ctl.buf; 774 dev->isoc_ctl.buf = NULL; 775 776 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 spin_unlock_irqrestore(&dev->buf_lock, flags); 781 } 782 783 int stk1160_vb2_setup(struct stk1160 *dev) 784 { 785 int rc; 786 struct vb2_queue *q; 787 788 q = &dev->vb_vidq; 789 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 790 q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 791 q->drv_priv = dev; 792 q->buf_struct_size = sizeof(struct stk1160_buffer); 793 q->ops = &stk1160_video_qops; 794 q->mem_ops = &vb2_vmalloc_memops; 795 q->lock = &dev->vb_queue_lock; 796 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 797 798 rc = vb2_queue_init(q); 799 if (rc < 0) 800 return rc; 801 802 /* initialize video dma queue */ 803 INIT_LIST_HEAD(&dev->avail_bufs); 804 805 return 0; 806 } 807 808 int stk1160_video_register(struct stk1160 *dev) 809 { 810 int rc; 811 812 /* Initialize video_device with a template structure */ 813 dev->vdev = v4l_template; 814 dev->vdev.queue = &dev->vb_vidq; 815 816 /* 817 * Provide mutexes for v4l2 core and for videobuf2 queue. 818 * It will be used to protect *only* v4l2 ioctls. 819 */ 820 dev->vdev.lock = &dev->v4l_lock; 821 822 /* This will be used to set video_device parent */ 823 dev->vdev.v4l2_dev = &dev->v4l2_dev; 824 825 /* NTSC is default */ 826 dev->norm = V4L2_STD_NTSC_M; 827 dev->width = 720; 828 dev->height = 480; 829 830 /* set default format */ 831 dev->fmt = &format[0]; 832 stk1160_set_std(dev); 833 834 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std, 835 dev->norm); 836 837 video_set_drvdata(&dev->vdev, dev); 838 rc = video_register_device(&dev->vdev, VFL_TYPE_GRABBER, -1); 839 if (rc < 0) { 840 stk1160_err("video_register_device failed (%d)\n", rc); 841 return rc; 842 } 843 844 v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n", 845 video_device_node_name(&dev->vdev)); 846 847 return 0; 848 } 849