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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * STK1160 driver4 *5 * Copyright (C) 2012 Ezequiel Garcia6 * <elezegarcia--a.t--gmail.com>7 *8 * Based on Easycap driver by R.M. Thomas9 * Copyright (C) 2010 R.M. Thomas10 * <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 31static bool keep_buffers;32module_param(keep_buffers, bool, 0644);33MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");34 35enum stk1160_decimate_mode {36 STK1160_DECIMATE_MORE_THAN_HALF,37 STK1160_DECIMATE_LESS_THAN_HALF,38};39 40struct 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 */47static 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 */58static unsigned int59div_round_integer(unsigned int x, unsigned int y)60{61 for (;; y++) {62 if (x % y == 0)63 return x / y;64 }65}66 67static 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 122static 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 send130 * a number of rows/columns multiple of four. This way, the131 * colour format is preserved. The STK1160_DEC_UNIT_SIZE bit132 * 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 */161static 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 bandwidth180 * 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 203static 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, OR225 * a new dev->max_pkt_size is detected226 */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 261out_uninit:262 stk1160_uninit_isoc(dev);263out_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 */273static 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 292static 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 handler299 * won't be running. This is required to safely release the300 * 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 322static 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 ioctls334 */335static 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 346static 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 356static 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 372static 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 each403 * 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 width410 */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 each422 * unit sent. This means count is:423 *424 * n = (frame width / width) - 1425 *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 475static 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 483static 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 504static 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 511static 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 519static 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 551static 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 else563 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 570static 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 577static 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_DEBUG592static 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 607static 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#endif616 617static 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_DEBUG644 .vidioc_g_register = vidioc_g_register,645 .vidioc_s_register = vidioc_s_register,646#endif647};648 649/********************************************************************/650 651/*652 * Videobuf2 operations653 */654static 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 684static 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 userspace696 * 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 return708 * 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 else713 list_add_tail(&buf->list, &dev->avail_bufs);714 715 }716 spin_unlock_irqrestore(&dev->buf_lock, flags);717}718 719static 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 */726static void stop_streaming(struct vb2_queue *vq)727{728 struct stk1160 *dev = vb2_get_drv_priv(vq);729 stk1160_stop_streaming(dev);730}731 732static 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 741static 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 */752void 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 780int 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 805int 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