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