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 struct stk1160_urb *stk_urb = &dev->isoc_ctl.urb_ctl[i]; 236 237 dma_sync_sgtable_for_device(stk1160_get_dmadev(dev), stk_urb->sgt, 238 DMA_FROM_DEVICE); 239 rc = usb_submit_urb(dev->isoc_ctl.urb_ctl[i].urb, GFP_KERNEL); 240 if (rc) { 241 stk1160_err("cannot submit urb[%d] (%d)\n", i, rc); 242 goto out_uninit; 243 } 244 } 245 246 /* Start saa711x */ 247 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 1); 248 249 dev->sequence = 0; 250 251 /* Start stk1160 */ 252 stk1160_write_reg(dev, STK1160_DCTRL, 0xb3); 253 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00); 254 255 stk1160_dbg("streaming started\n"); 256 257 mutex_unlock(&dev->v4l_lock); 258 259 return 0; 260 261 out_uninit: 262 stk1160_uninit_isoc(dev); 263 out_stop_hw: 264 usb_set_interface(dev->udev, 0, 0); 265 stk1160_clear_queue(dev, VB2_BUF_STATE_QUEUED); 266 267 mutex_unlock(&dev->v4l_lock); 268 269 return rc; 270 } 271 272 /* Must be called with v4l_lock hold */ 273 static void stk1160_stop_hw(struct stk1160 *dev) 274 { 275 /* If the device is not physically present, there is nothing to do */ 276 if (!dev->udev) 277 return; 278 279 /* set alternate 0 */ 280 dev->alt = 0; 281 stk1160_dbg("setting alternate %d\n", dev->alt); 282 usb_set_interface(dev->udev, 0, 0); 283 284 /* Stop stk1160 */ 285 stk1160_write_reg(dev, STK1160_DCTRL, 0x00); 286 stk1160_write_reg(dev, STK1160_DCTRL+3, 0x00); 287 288 /* Stop saa711x */ 289 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_stream, 0); 290 } 291 292 static int stk1160_stop_streaming(struct stk1160 *dev) 293 { 294 if (mutex_lock_interruptible(&dev->v4l_lock)) 295 return -ERESTARTSYS; 296 297 /* 298 * Once URBs are cancelled, the URB complete handler 299 * won't be running. This is required to safely release the 300 * current buffer (dev->isoc_ctl.buf). 301 */ 302 stk1160_cancel_isoc(dev); 303 304 /* 305 * It is possible to keep buffers around using a module parameter. 306 * This is intended to avoid memory fragmentation. 307 */ 308 if (!keep_buffers) 309 stk1160_free_isoc(dev); 310 311 stk1160_stop_hw(dev); 312 313 stk1160_clear_queue(dev, VB2_BUF_STATE_ERROR); 314 315 stk1160_dbg("streaming stopped\n"); 316 317 mutex_unlock(&dev->v4l_lock); 318 319 return 0; 320 } 321 322 static const struct v4l2_file_operations stk1160_fops = { 323 .owner = THIS_MODULE, 324 .open = v4l2_fh_open, 325 .release = vb2_fop_release, 326 .read = vb2_fop_read, 327 .poll = vb2_fop_poll, 328 .mmap = vb2_fop_mmap, 329 .unlocked_ioctl = video_ioctl2, 330 }; 331 332 /* 333 * vidioc ioctls 334 */ 335 static int vidioc_querycap(struct file *file, 336 void *priv, struct v4l2_capability *cap) 337 { 338 struct stk1160 *dev = video_drvdata(file); 339 340 strscpy(cap->driver, "stk1160", sizeof(cap->driver)); 341 strscpy(cap->card, "stk1160", sizeof(cap->card)); 342 usb_make_path(dev->udev, cap->bus_info, sizeof(cap->bus_info)); 343 return 0; 344 } 345 346 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv, 347 struct v4l2_fmtdesc *f) 348 { 349 if (f->index != 0) 350 return -EINVAL; 351 352 f->pixelformat = format[f->index].fourcc; 353 return 0; 354 } 355 356 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv, 357 struct v4l2_format *f) 358 { 359 struct stk1160 *dev = video_drvdata(file); 360 361 f->fmt.pix.width = dev->width; 362 f->fmt.pix.height = dev->height; 363 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 364 f->fmt.pix.pixelformat = dev->fmt->fourcc; 365 f->fmt.pix.bytesperline = dev->width * 2; 366 f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline; 367 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 368 369 return 0; 370 } 371 372 static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f, 373 struct stk1160_decimate_ctrl *ctrl) 374 { 375 unsigned int width, height; 376 unsigned int base_width, base_height; 377 unsigned int col_n, row_n; 378 enum stk1160_decimate_mode col_mode, row_mode; 379 bool col_en, row_en; 380 381 base_width = 720; 382 base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576; 383 384 /* Minimum width and height is 5% the frame size */ 385 width = clamp_t(unsigned int, f->fmt.pix.width, 386 base_width / 20, base_width); 387 height = clamp_t(unsigned int, f->fmt.pix.height, 388 base_height / 20, base_height); 389 390 /* Let's set default no decimation values */ 391 col_n = 0; 392 row_n = 0; 393 col_en = false; 394 row_en = false; 395 f->fmt.pix.width = base_width; 396 f->fmt.pix.height = base_height; 397 row_mode = STK1160_DECIMATE_LESS_THAN_HALF; 398 col_mode = STK1160_DECIMATE_LESS_THAN_HALF; 399 400 if (width < base_width && width > base_width / 2) { 401 /* 402 * The device will send count units for each 403 * unit skipped. This means count unit is: 404 * 405 * n = width / (frame width - width) 406 * 407 * And the width is: 408 * 409 * width = (n / n + 1) * frame width 410 */ 411 col_n = div_round_integer(width, base_width - width); 412 if (col_n > 0 && col_n <= 255) { 413 col_en = true; 414 col_mode = STK1160_DECIMATE_LESS_THAN_HALF; 415 f->fmt.pix.width = (base_width * col_n) / (col_n + 1); 416 } 417 418 } else if (width <= base_width / 2) { 419 420 /* 421 * The device will skip count units for each 422 * unit sent. This means count is: 423 * 424 * n = (frame width / width) - 1 425 * 426 * And the width is: 427 * 428 * width = frame width / (n + 1) 429 */ 430 col_n = div_round_integer(base_width, width) - 1; 431 if (col_n > 0 && col_n <= 255) { 432 col_en = true; 433 col_mode = STK1160_DECIMATE_MORE_THAN_HALF; 434 f->fmt.pix.width = base_width / (col_n + 1); 435 } 436 } 437 438 if (height < base_height && height > base_height / 2) { 439 row_n = div_round_integer(height, base_height - height); 440 if (row_n > 0 && row_n <= 255) { 441 row_en = true; 442 row_mode = STK1160_DECIMATE_LESS_THAN_HALF; 443 f->fmt.pix.height = (base_height * row_n) / (row_n + 1); 444 } 445 446 } else if (height <= base_height / 2) { 447 row_n = div_round_integer(base_height, height) - 1; 448 if (row_n > 0 && row_n <= 255) { 449 row_en = true; 450 row_mode = STK1160_DECIMATE_MORE_THAN_HALF; 451 f->fmt.pix.height = base_height / (row_n + 1); 452 } 453 } 454 455 f->fmt.pix.pixelformat = dev->fmt->fourcc; 456 f->fmt.pix.field = V4L2_FIELD_INTERLACED; 457 f->fmt.pix.bytesperline = f->fmt.pix.width * 2; 458 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; 459 f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M; 460 461 if (ctrl) { 462 ctrl->col_en = col_en; 463 ctrl->col_n = col_n; 464 ctrl->col_mode = col_mode; 465 ctrl->row_en = row_en; 466 ctrl->row_n = row_n; 467 ctrl->row_mode = row_mode; 468 } 469 470 stk1160_dbg("width %d, height %d\n", 471 f->fmt.pix.width, f->fmt.pix.height); 472 return 0; 473 } 474 475 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, 476 struct v4l2_format *f) 477 { 478 struct stk1160 *dev = video_drvdata(file); 479 480 return stk1160_try_fmt(dev, f, NULL); 481 } 482 483 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 484 struct v4l2_format *f) 485 { 486 struct stk1160 *dev = video_drvdata(file); 487 struct vb2_queue *q = &dev->vb_vidq; 488 struct stk1160_decimate_ctrl ctrl; 489 int rc; 490 491 if (vb2_is_busy(q)) 492 return -EBUSY; 493 494 rc = stk1160_try_fmt(dev, f, &ctrl); 495 if (rc < 0) 496 return rc; 497 dev->width = f->fmt.pix.width; 498 dev->height = f->fmt.pix.height; 499 stk1160_set_fmt(dev, &ctrl); 500 501 return 0; 502 } 503 504 static int vidioc_querystd(struct file *file, void *priv, v4l2_std_id *norm) 505 { 506 struct stk1160 *dev = video_drvdata(file); 507 v4l2_device_call_all(&dev->v4l2_dev, 0, video, querystd, norm); 508 return 0; 509 } 510 511 static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm) 512 { 513 struct stk1160 *dev = video_drvdata(file); 514 515 *norm = dev->norm; 516 return 0; 517 } 518 519 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm) 520 { 521 struct stk1160 *dev = video_drvdata(file); 522 struct vb2_queue *q = &dev->vb_vidq; 523 524 if (dev->norm == norm) 525 return 0; 526 527 if (vb2_is_busy(q)) 528 return -EBUSY; 529 530 /* Check device presence */ 531 if (!dev->udev) 532 return -ENODEV; 533 534 /* We need to set this now, before we call stk1160_set_std */ 535 dev->width = 720; 536 dev->height = (norm & V4L2_STD_525_60) ? 480 : 576; 537 dev->norm = norm; 538 539 stk1160_set_std(dev); 540 541 /* Calling with NULL disables frame decimation */ 542 stk1160_set_fmt(dev, NULL); 543 544 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std, 545 dev->norm); 546 547 return 0; 548 } 549 550 551 static int vidioc_enum_input(struct file *file, void *priv, 552 struct v4l2_input *i) 553 { 554 struct stk1160 *dev = video_drvdata(file); 555 556 if (i->index > STK1160_MAX_INPUT) 557 return -EINVAL; 558 559 /* S-Video special handling */ 560 if (i->index == STK1160_SVIDEO_INPUT) 561 sprintf(i->name, "S-Video"); 562 else 563 sprintf(i->name, "Composite%d", i->index); 564 565 i->type = V4L2_INPUT_TYPE_CAMERA; 566 i->std = dev->vdev.tvnorms; 567 return 0; 568 } 569 570 static int vidioc_g_input(struct file *file, void *priv, unsigned int *i) 571 { 572 struct stk1160 *dev = video_drvdata(file); 573 *i = dev->ctl_input; 574 return 0; 575 } 576 577 static int vidioc_s_input(struct file *file, void *priv, unsigned int i) 578 { 579 struct stk1160 *dev = video_drvdata(file); 580 581 if (i > STK1160_MAX_INPUT) 582 return -EINVAL; 583 584 dev->ctl_input = i; 585 586 stk1160_select_input(dev); 587 588 return 0; 589 } 590 591 #ifdef CONFIG_VIDEO_ADV_DEBUG 592 static int vidioc_g_register(struct file *file, void *priv, 593 struct v4l2_dbg_register *reg) 594 { 595 struct stk1160 *dev = video_drvdata(file); 596 int rc; 597 u8 val; 598 599 /* Match host */ 600 rc = stk1160_read_reg(dev, reg->reg, &val); 601 reg->val = val; 602 reg->size = 1; 603 604 return rc; 605 } 606 607 static int vidioc_s_register(struct file *file, void *priv, 608 const struct v4l2_dbg_register *reg) 609 { 610 struct stk1160 *dev = video_drvdata(file); 611 612 /* Match host */ 613 return stk1160_write_reg(dev, reg->reg, reg->val); 614 } 615 #endif 616 617 static const struct v4l2_ioctl_ops stk1160_ioctl_ops = { 618 .vidioc_querycap = vidioc_querycap, 619 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap, 620 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap, 621 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap, 622 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap, 623 .vidioc_querystd = vidioc_querystd, 624 .vidioc_g_std = vidioc_g_std, 625 .vidioc_s_std = vidioc_s_std, 626 .vidioc_enum_input = vidioc_enum_input, 627 .vidioc_g_input = vidioc_g_input, 628 .vidioc_s_input = vidioc_s_input, 629 630 /* vb2 takes care of these */ 631 .vidioc_reqbufs = vb2_ioctl_reqbufs, 632 .vidioc_querybuf = vb2_ioctl_querybuf, 633 .vidioc_qbuf = vb2_ioctl_qbuf, 634 .vidioc_dqbuf = vb2_ioctl_dqbuf, 635 .vidioc_streamon = vb2_ioctl_streamon, 636 .vidioc_streamoff = vb2_ioctl_streamoff, 637 .vidioc_expbuf = vb2_ioctl_expbuf, 638 639 .vidioc_log_status = v4l2_ctrl_log_status, 640 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 641 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 642 643 #ifdef CONFIG_VIDEO_ADV_DEBUG 644 .vidioc_g_register = vidioc_g_register, 645 .vidioc_s_register = vidioc_s_register, 646 #endif 647 }; 648 649 /********************************************************************/ 650 651 /* 652 * Videobuf2 operations 653 */ 654 static int queue_setup(struct vb2_queue *vq, 655 unsigned int *nbuffers, unsigned int *nplanes, 656 unsigned int sizes[], struct device *alloc_devs[]) 657 { 658 struct stk1160 *dev = vb2_get_drv_priv(vq); 659 unsigned long size; 660 661 size = dev->width * dev->height * 2; 662 663 /* 664 * Here we can change the number of buffers being requested. 665 * So, we set a minimum and a maximum like this: 666 */ 667 *nbuffers = clamp_t(unsigned int, *nbuffers, 668 STK1160_MIN_VIDEO_BUFFERS, STK1160_MAX_VIDEO_BUFFERS); 669 670 if (*nplanes) 671 return sizes[0] < size ? -EINVAL : 0; 672 673 /* This means a packed colorformat */ 674 *nplanes = 1; 675 676 sizes[0] = size; 677 678 stk1160_dbg("%s: buffer count %d, each %ld bytes\n", 679 __func__, *nbuffers, size); 680 681 return 0; 682 } 683 684 static void buffer_queue(struct vb2_buffer *vb) 685 { 686 unsigned long flags; 687 struct stk1160 *dev = vb2_get_drv_priv(vb->vb2_queue); 688 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 689 struct stk1160_buffer *buf = 690 container_of(vbuf, struct stk1160_buffer, vb); 691 692 spin_lock_irqsave(&dev->buf_lock, flags); 693 if (!dev->udev) { 694 /* 695 * If the device is disconnected return the buffer to userspace 696 * directly. The next QBUF call will fail with -ENODEV. 697 */ 698 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 699 } else { 700 701 buf->mem = vb2_plane_vaddr(vb, 0); 702 buf->length = vb2_plane_size(vb, 0); 703 buf->bytesused = 0; 704 buf->pos = 0; 705 706 /* 707 * If buffer length is less from expected then we return 708 * the buffer to userspace directly. 709 */ 710 if (buf->length < dev->width * dev->height * 2) 711 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR); 712 else 713 list_add_tail(&buf->list, &dev->avail_bufs); 714 715 } 716 spin_unlock_irqrestore(&dev->buf_lock, flags); 717 } 718 719 static int start_streaming(struct vb2_queue *vq, unsigned int count) 720 { 721 struct stk1160 *dev = vb2_get_drv_priv(vq); 722 return stk1160_start_streaming(dev); 723 } 724 725 /* abort streaming and wait for last buffer */ 726 static void stop_streaming(struct vb2_queue *vq) 727 { 728 struct stk1160 *dev = vb2_get_drv_priv(vq); 729 stk1160_stop_streaming(dev); 730 } 731 732 static const struct vb2_ops stk1160_video_qops = { 733 .queue_setup = queue_setup, 734 .buf_queue = buffer_queue, 735 .start_streaming = start_streaming, 736 .stop_streaming = stop_streaming, 737 .wait_prepare = vb2_ops_wait_prepare, 738 .wait_finish = vb2_ops_wait_finish, 739 }; 740 741 static const struct video_device v4l_template = { 742 .name = "stk1160", 743 .tvnorms = V4L2_STD_525_60 | V4L2_STD_625_50, 744 .fops = &stk1160_fops, 745 .ioctl_ops = &stk1160_ioctl_ops, 746 .release = video_device_release_empty, 747 }; 748 749 /********************************************************************/ 750 751 /* Must be called with both v4l_lock and vb_queue_lock hold */ 752 void stk1160_clear_queue(struct stk1160 *dev, enum vb2_buffer_state vb2_state) 753 { 754 struct stk1160_buffer *buf; 755 unsigned long flags; 756 757 /* Release all active buffers */ 758 spin_lock_irqsave(&dev->buf_lock, flags); 759 while (!list_empty(&dev->avail_bufs)) { 760 buf = list_first_entry(&dev->avail_bufs, 761 struct stk1160_buffer, list); 762 list_del(&buf->list); 763 vb2_buffer_done(&buf->vb.vb2_buf, vb2_state); 764 stk1160_dbg("buffer [%p/%d] aborted\n", 765 buf, buf->vb.vb2_buf.index); 766 } 767 768 /* It's important to release the current buffer */ 769 if (dev->isoc_ctl.buf) { 770 buf = dev->isoc_ctl.buf; 771 dev->isoc_ctl.buf = NULL; 772 773 vb2_buffer_done(&buf->vb.vb2_buf, vb2_state); 774 stk1160_dbg("buffer [%p/%d] aborted\n", 775 buf, buf->vb.vb2_buf.index); 776 } 777 spin_unlock_irqrestore(&dev->buf_lock, flags); 778 } 779 780 int stk1160_vb2_setup(struct stk1160 *dev) 781 { 782 int rc; 783 struct vb2_queue *q; 784 785 q = &dev->vb_vidq; 786 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; 787 q->io_modes = VB2_READ | VB2_MMAP | VB2_USERPTR | VB2_DMABUF; 788 q->drv_priv = dev; 789 q->buf_struct_size = sizeof(struct stk1160_buffer); 790 q->ops = &stk1160_video_qops; 791 q->mem_ops = &vb2_vmalloc_memops; 792 q->lock = &dev->vb_queue_lock; 793 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; 794 795 rc = vb2_queue_init(q); 796 if (rc < 0) 797 return rc; 798 799 /* initialize video dma queue */ 800 INIT_LIST_HEAD(&dev->avail_bufs); 801 802 return 0; 803 } 804 805 int stk1160_video_register(struct stk1160 *dev) 806 { 807 int rc; 808 809 /* Initialize video_device with a template structure */ 810 dev->vdev = v4l_template; 811 dev->vdev.queue = &dev->vb_vidq; 812 813 /* 814 * Provide mutexes for v4l2 core and for videobuf2 queue. 815 * It will be used to protect *only* v4l2 ioctls. 816 */ 817 dev->vdev.lock = &dev->v4l_lock; 818 819 /* This will be used to set video_device parent */ 820 dev->vdev.v4l2_dev = &dev->v4l2_dev; 821 dev->vdev.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING | 822 V4L2_CAP_READWRITE; 823 824 /* NTSC is default */ 825 dev->norm = V4L2_STD_NTSC_M; 826 dev->width = 720; 827 dev->height = 480; 828 829 /* set default format */ 830 dev->fmt = &format[0]; 831 stk1160_set_std(dev); 832 833 v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std, 834 dev->norm); 835 836 video_set_drvdata(&dev->vdev, dev); 837 rc = video_register_device(&dev->vdev, VFL_TYPE_VIDEO, -1); 838 if (rc < 0) { 839 stk1160_err("video_register_device failed (%d)\n", rc); 840 return rc; 841 } 842 843 v4l2_info(&dev->v4l2_dev, "V4L2 device registered as %s\n", 844 video_device_node_name(&dev->vdev)); 845 846 return 0; 847 } 848