1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * TI OMAP4 ISS V4L2 Driver - Generic video node
4 *
5 * Copyright (C) 2012 Texas Instruments, Inc.
6 *
7 * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/mm.h>
12#include <linux/pagemap.h>
13#include <linux/sched.h>
14#include <linux/slab.h>
15#include <linux/vmalloc.h>
16#include <linux/module.h>
17
18#include <media/v4l2-dev.h>
19#include <media/v4l2-ioctl.h>
20#include <media/v4l2-mc.h>
21
22#include "iss_video.h"
23#include "iss.h"
24
25/* -----------------------------------------------------------------------------
26 * Helper functions
27 */
28
29static struct iss_format_info formats[] = {
30 { MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
31 MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
32 V4L2_PIX_FMT_GREY, 8, },
33 { MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
34 MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
35 V4L2_PIX_FMT_Y10, 10, },
36 { MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
37 MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
38 V4L2_PIX_FMT_Y12, 12, },
39 { MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
40 MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
41 V4L2_PIX_FMT_SBGGR8, 8, },
42 { MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
43 MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
44 V4L2_PIX_FMT_SGBRG8, 8, },
45 { MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
46 MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
47 V4L2_PIX_FMT_SGRBG8, 8, },
48 { MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
49 MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
50 V4L2_PIX_FMT_SRGGB8, 8, },
51 { MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
52 MEDIA_BUS_FMT_SGRBG10_1X10, 0,
53 V4L2_PIX_FMT_SGRBG10DPCM8, 8, },
54 { MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
55 MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
56 V4L2_PIX_FMT_SBGGR10, 10, },
57 { MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
58 MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
59 V4L2_PIX_FMT_SGBRG10, 10, },
60 { MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
61 MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
62 V4L2_PIX_FMT_SGRBG10, 10, },
63 { MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
64 MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
65 V4L2_PIX_FMT_SRGGB10, 10, },
66 { MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
67 MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
68 V4L2_PIX_FMT_SBGGR12, 12, },
69 { MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
70 MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
71 V4L2_PIX_FMT_SGBRG12, 12, },
72 { MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
73 MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
74 V4L2_PIX_FMT_SGRBG12, 12, },
75 { MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
76 MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
77 V4L2_PIX_FMT_SRGGB12, 12, },
78 { MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
79 MEDIA_BUS_FMT_UYVY8_1X16, 0,
80 V4L2_PIX_FMT_UYVY, 16, },
81 { MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
82 MEDIA_BUS_FMT_YUYV8_1X16, 0,
83 V4L2_PIX_FMT_YUYV, 16, },
84 { MEDIA_BUS_FMT_YUYV8_1_5X8, MEDIA_BUS_FMT_YUYV8_1_5X8,
85 MEDIA_BUS_FMT_YUYV8_1_5X8, 0,
86 V4L2_PIX_FMT_NV12, 8, },
87};
88
89const struct iss_format_info *
90omap4iss_video_format_info(u32 code)
91{
92 unsigned int i;
93
94 for (i = 0; i < ARRAY_SIZE(formats); ++i) {
95 if (formats[i].code == code)
96 return &formats[i];
97 }
98
99 return NULL;
100}
101
102/*
103 * iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
104 * @video: ISS video instance
105 * @mbus: v4l2_mbus_framefmt format (input)
106 * @pix: v4l2_pix_format format (output)
107 *
108 * Fill the output pix structure with information from the input mbus format.
109 * The bytesperline and sizeimage fields are computed from the requested bytes
110 * per line value in the pix format and information from the video instance.
111 *
112 * Return the number of padding bytes at end of line.
113 */
114static unsigned int iss_video_mbus_to_pix(const struct iss_video *video,
115 const struct v4l2_mbus_framefmt *mbus,
116 struct v4l2_pix_format *pix)
117{
118 unsigned int bpl = pix->bytesperline;
119 unsigned int min_bpl;
120 unsigned int i;
121
122 memset(pix, 0, sizeof(*pix));
123 pix->width = mbus->width;
124 pix->height = mbus->height;
125
126 /*
127 * Skip the last format in the loop so that it will be selected if no
128 * match is found.
129 */
130 for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
131 if (formats[i].code == mbus->code)
132 break;
133 }
134
135 min_bpl = pix->width * ALIGN(formats[i].bpp, 8) / 8;
136
137 /*
138 * Clamp the requested bytes per line value. If the maximum bytes per
139 * line value is zero, the module doesn't support user configurable line
140 * sizes. Override the requested value with the minimum in that case.
141 */
142 if (video->bpl_max)
143 bpl = clamp(bpl, min_bpl, video->bpl_max);
144 else
145 bpl = min_bpl;
146
147 if (!video->bpl_zero_padding || bpl != min_bpl)
148 bpl = ALIGN(bpl, video->bpl_alignment);
149
150 pix->pixelformat = formats[i].pixelformat;
151 pix->bytesperline = bpl;
152 pix->sizeimage = pix->bytesperline * pix->height;
153 pix->colorspace = mbus->colorspace;
154 pix->field = mbus->field;
155
156 /* FIXME: Special case for NV12! We should make this nicer... */
157 if (pix->pixelformat == V4L2_PIX_FMT_NV12)
158 pix->sizeimage += (pix->bytesperline * pix->height) / 2;
159
160 return bpl - min_bpl;
161}
162
163static void iss_video_pix_to_mbus(const struct v4l2_pix_format *pix,
164 struct v4l2_mbus_framefmt *mbus)
165{
166 unsigned int i;
167
168 memset(mbus, 0, sizeof(*mbus));
169 mbus->width = pix->width;
170 mbus->height = pix->height;
171
172 /*
173 * Skip the last format in the loop so that it will be selected if no
174 * match is found.
175 */
176 for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
177 if (formats[i].pixelformat == pix->pixelformat)
178 break;
179 }
180
181 mbus->code = formats[i].code;
182 mbus->colorspace = pix->colorspace;
183 mbus->field = pix->field;
184}
185
186static struct v4l2_subdev *
187iss_video_remote_subdev(struct iss_video *video, u32 *pad)
188{
189 struct media_pad *remote;
190
191 remote = media_pad_remote_pad_first(pad: &video->pad);
192
193 if (!remote || !is_media_entity_v4l2_subdev(entity: remote->entity))
194 return NULL;
195
196 if (pad)
197 *pad = remote->index;
198
199 return media_entity_to_v4l2_subdev(remote->entity);
200}
201
202/* Return a pointer to the ISS video instance at the far end of the pipeline. */
203static struct iss_video *
204iss_video_far_end(struct iss_video *video, struct iss_pipeline *pipe)
205{
206 struct media_pipeline_entity_iter iter;
207 struct media_entity *entity;
208 struct iss_video *far_end = NULL;
209 int ret;
210
211 ret = media_pipeline_entity_iter_init(pipe: &pipe->pipe, iter: &iter);
212 if (ret)
213 return ERR_PTR(error: -ENOMEM);
214
215 media_pipeline_for_each_entity(&pipe->pipe, &iter, entity) {
216 struct iss_video *other;
217
218 if (entity == &video->video.entity)
219 continue;
220
221 if (!is_media_entity_v4l2_video_device(entity))
222 continue;
223
224 other = to_iss_video(media_entity_to_video_device(entity));
225 if (other->type != video->type) {
226 far_end = other;
227 break;
228 }
229 }
230
231 media_pipeline_entity_iter_cleanup(iter: &iter);
232
233 return far_end;
234}
235
236static int
237__iss_video_get_format(struct iss_video *video,
238 struct v4l2_mbus_framefmt *format)
239{
240 struct v4l2_subdev_format fmt = {
241 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
242 };
243 struct v4l2_subdev *subdev;
244 u32 pad;
245 int ret;
246
247 subdev = iss_video_remote_subdev(video, pad: &pad);
248 if (!subdev)
249 return -EINVAL;
250
251 fmt.pad = pad;
252
253 mutex_lock(&video->mutex);
254 ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
255 mutex_unlock(lock: &video->mutex);
256
257 if (ret)
258 return ret;
259
260 *format = fmt.format;
261 return 0;
262}
263
264static int
265iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
266{
267 struct v4l2_mbus_framefmt format;
268 struct v4l2_pix_format pixfmt;
269 int ret;
270
271 ret = __iss_video_get_format(video, format: &format);
272 if (ret < 0)
273 return ret;
274
275 pixfmt.bytesperline = 0;
276 ret = iss_video_mbus_to_pix(video, mbus: &format, pix: &pixfmt);
277
278 if (vfh->format.fmt.pix.pixelformat != pixfmt.pixelformat ||
279 vfh->format.fmt.pix.height != pixfmt.height ||
280 vfh->format.fmt.pix.width != pixfmt.width ||
281 vfh->format.fmt.pix.bytesperline != pixfmt.bytesperline ||
282 vfh->format.fmt.pix.sizeimage != pixfmt.sizeimage)
283 return -EINVAL;
284
285 return ret;
286}
287
288/* -----------------------------------------------------------------------------
289 * Video queue operations
290 */
291
292static int iss_video_queue_setup(struct vb2_queue *vq,
293 unsigned int *count, unsigned int *num_planes,
294 unsigned int sizes[],
295 struct device *alloc_devs[])
296{
297 struct iss_video_fh *vfh = vb2_get_drv_priv(q: vq);
298 struct iss_video *video = vfh->video;
299
300 /* Revisit multi-planar support for NV12 */
301 *num_planes = 1;
302
303 sizes[0] = vfh->format.fmt.pix.sizeimage;
304 if (sizes[0] == 0)
305 return -EINVAL;
306
307 *count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));
308
309 return 0;
310}
311
312static void iss_video_buf_cleanup(struct vb2_buffer *vb)
313{
314 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
315 struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
316
317 if (buffer->iss_addr)
318 buffer->iss_addr = 0;
319}
320
321static int iss_video_buf_prepare(struct vb2_buffer *vb)
322{
323 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
324 struct iss_video_fh *vfh = vb2_get_drv_priv(q: vb->vb2_queue);
325 struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
326 struct iss_video *video = vfh->video;
327 unsigned long size = vfh->format.fmt.pix.sizeimage;
328 dma_addr_t addr;
329
330 if (vb2_plane_size(vb, plane_no: 0) < size)
331 return -ENOBUFS;
332
333 addr = vb2_dma_contig_plane_dma_addr(vb, plane_no: 0);
334 if (!IS_ALIGNED(addr, 32)) {
335 dev_dbg(video->iss->dev,
336 "Buffer address must be aligned to 32 bytes boundary.\n");
337 return -EINVAL;
338 }
339
340 vb2_set_plane_payload(vb, plane_no: 0, size);
341 buffer->iss_addr = addr;
342 return 0;
343}
344
345static void iss_video_buf_queue(struct vb2_buffer *vb)
346{
347 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
348 struct iss_video_fh *vfh = vb2_get_drv_priv(q: vb->vb2_queue);
349 struct iss_video *video = vfh->video;
350 struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
351 struct iss_pipeline *pipe = to_iss_pipeline(entity: &video->video.entity);
352 unsigned long flags;
353 bool empty;
354
355 spin_lock_irqsave(&video->qlock, flags);
356
357 /*
358 * Mark the buffer is faulty and give it back to the queue immediately
359 * if the video node has registered an error. vb2 will perform the same
360 * check when preparing the buffer, but that is inherently racy, so we
361 * need to handle the race condition with an authoritative check here.
362 */
363 if (unlikely(video->error)) {
364 vb2_buffer_done(vb, state: VB2_BUF_STATE_ERROR);
365 spin_unlock_irqrestore(lock: &video->qlock, flags);
366 return;
367 }
368
369 empty = list_empty(head: &video->dmaqueue);
370 list_add_tail(new: &buffer->list, head: &video->dmaqueue);
371
372 spin_unlock_irqrestore(lock: &video->qlock, flags);
373
374 if (empty) {
375 enum iss_pipeline_state state;
376 unsigned int start;
377
378 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
379 state = ISS_PIPELINE_QUEUE_OUTPUT;
380 else
381 state = ISS_PIPELINE_QUEUE_INPUT;
382
383 spin_lock_irqsave(&pipe->lock, flags);
384 pipe->state |= state;
385 video->ops->queue(video, buffer);
386 video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
387
388 start = iss_pipeline_ready(pipe);
389 if (start)
390 pipe->state |= ISS_PIPELINE_STREAM;
391 spin_unlock_irqrestore(lock: &pipe->lock, flags);
392
393 if (start)
394 omap4iss_pipeline_set_stream(pipe,
395 state: ISS_PIPELINE_STREAM_SINGLESHOT);
396 }
397}
398
399static const struct vb2_ops iss_video_vb2ops = {
400 .queue_setup = iss_video_queue_setup,
401 .buf_prepare = iss_video_buf_prepare,
402 .buf_queue = iss_video_buf_queue,
403 .buf_cleanup = iss_video_buf_cleanup,
404};
405
406/*
407 * omap4iss_video_buffer_next - Complete the current buffer and return the next
408 * @video: ISS video object
409 *
410 * Remove the current video buffer from the DMA queue and fill its timestamp,
411 * field count and state fields before waking up its completion handler.
412 *
413 * For capture video nodes, the buffer state is set to VB2_BUF_STATE_DONE if no
414 * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
415 *
416 * The DMA queue is expected to contain at least one buffer.
417 *
418 * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
419 * empty.
420 */
421struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
422{
423 struct iss_pipeline *pipe = to_iss_pipeline(entity: &video->video.entity);
424 enum iss_pipeline_state state;
425 struct iss_buffer *buf;
426 unsigned long flags;
427
428 spin_lock_irqsave(&video->qlock, flags);
429 if (WARN_ON(list_empty(&video->dmaqueue))) {
430 spin_unlock_irqrestore(lock: &video->qlock, flags);
431 return NULL;
432 }
433
434 buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
435 list);
436 list_del(entry: &buf->list);
437 spin_unlock_irqrestore(lock: &video->qlock, flags);
438
439 buf->vb.vb2_buf.timestamp = ktime_get_ns();
440
441 /*
442 * Do frame number propagation only if this is the output video node.
443 * Frame number either comes from the CSI receivers or it gets
444 * incremented here if H3A is not active.
445 * Note: There is no guarantee that the output buffer will finish
446 * first, so the input number might lag behind by 1 in some cases.
447 */
448 if (video == pipe->output && !pipe->do_propagation)
449 buf->vb.sequence =
450 atomic_inc_return(v: &pipe->frame_number);
451 else
452 buf->vb.sequence = atomic_read(v: &pipe->frame_number);
453
454 vb2_buffer_done(vb: &buf->vb.vb2_buf, state: pipe->error ?
455 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
456 pipe->error = false;
457
458 spin_lock_irqsave(&video->qlock, flags);
459 if (list_empty(head: &video->dmaqueue)) {
460 spin_unlock_irqrestore(lock: &video->qlock, flags);
461 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
462 state = ISS_PIPELINE_QUEUE_OUTPUT
463 | ISS_PIPELINE_STREAM;
464 else
465 state = ISS_PIPELINE_QUEUE_INPUT
466 | ISS_PIPELINE_STREAM;
467
468 spin_lock_irqsave(&pipe->lock, flags);
469 pipe->state &= ~state;
470 if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
471 video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
472 spin_unlock_irqrestore(lock: &pipe->lock, flags);
473 return NULL;
474 }
475
476 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input) {
477 spin_lock(lock: &pipe->lock);
478 pipe->state &= ~ISS_PIPELINE_STREAM;
479 spin_unlock(lock: &pipe->lock);
480 }
481
482 buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
483 list);
484 spin_unlock_irqrestore(lock: &video->qlock, flags);
485 buf->vb.vb2_buf.state = VB2_BUF_STATE_ACTIVE;
486 return buf;
487}
488
489/*
490 * omap4iss_video_cancel_stream - Cancel stream on a video node
491 * @video: ISS video object
492 *
493 * Cancelling a stream mark all buffers on the video node as erroneous and makes
494 * sure no new buffer can be queued.
495 */
496void omap4iss_video_cancel_stream(struct iss_video *video)
497{
498 unsigned long flags;
499
500 spin_lock_irqsave(&video->qlock, flags);
501
502 while (!list_empty(head: &video->dmaqueue)) {
503 struct iss_buffer *buf;
504
505 buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
506 list);
507 list_del(entry: &buf->list);
508 vb2_buffer_done(vb: &buf->vb.vb2_buf, state: VB2_BUF_STATE_ERROR);
509 }
510
511 vb2_queue_error(q: video->queue);
512 video->error = true;
513
514 spin_unlock_irqrestore(lock: &video->qlock, flags);
515}
516
517/* -----------------------------------------------------------------------------
518 * V4L2 ioctls
519 */
520
521static int
522iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
523{
524 struct iss_video *video = video_drvdata(file);
525
526 strscpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
527 strscpy(cap->card, video->video.name, sizeof(cap->card));
528 strscpy(cap->bus_info, "media", sizeof(cap->bus_info));
529 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
530 | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT;
531
532 return 0;
533}
534
535static int
536iss_video_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
537{
538 struct iss_video *video = video_drvdata(file);
539 struct v4l2_mbus_framefmt format;
540 unsigned int index = f->index;
541 unsigned int i;
542 int ret;
543
544 if (f->type != video->type)
545 return -EINVAL;
546
547 ret = __iss_video_get_format(video, format: &format);
548 if (ret < 0)
549 return ret;
550
551 for (i = 0; i < ARRAY_SIZE(formats); ++i) {
552 const struct iss_format_info *info = &formats[i];
553
554 if (format.code != info->code)
555 continue;
556
557 if (index == 0) {
558 f->pixelformat = info->pixelformat;
559 return 0;
560 }
561
562 index--;
563 }
564
565 return -EINVAL;
566}
567
568static int
569iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
570{
571 struct iss_video_fh *vfh = to_iss_video_fh(fh);
572 struct iss_video *video = video_drvdata(file);
573
574 if (format->type != video->type)
575 return -EINVAL;
576
577 mutex_lock(&video->mutex);
578 *format = vfh->format;
579 mutex_unlock(lock: &video->mutex);
580
581 return 0;
582}
583
584static int
585iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
586{
587 struct iss_video_fh *vfh = to_iss_video_fh(fh);
588 struct iss_video *video = video_drvdata(file);
589 struct v4l2_mbus_framefmt fmt;
590
591 if (format->type != video->type)
592 return -EINVAL;
593
594 mutex_lock(&video->mutex);
595
596 /*
597 * Fill the bytesperline and sizeimage fields by converting to media bus
598 * format and back to pixel format.
599 */
600 iss_video_pix_to_mbus(pix: &format->fmt.pix, mbus: &fmt);
601 iss_video_mbus_to_pix(video, mbus: &fmt, pix: &format->fmt.pix);
602
603 vfh->format = *format;
604
605 mutex_unlock(lock: &video->mutex);
606 return 0;
607}
608
609static int
610iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
611{
612 struct iss_video *video = video_drvdata(file);
613 struct v4l2_subdev_format fmt = {
614 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
615 };
616 struct v4l2_subdev *subdev;
617 u32 pad;
618 int ret;
619
620 if (format->type != video->type)
621 return -EINVAL;
622
623 subdev = iss_video_remote_subdev(video, pad: &pad);
624 if (!subdev)
625 return -EINVAL;
626
627 iss_video_pix_to_mbus(pix: &format->fmt.pix, mbus: &fmt.format);
628
629 fmt.pad = pad;
630 ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
631 if (ret)
632 return ret;
633
634 iss_video_mbus_to_pix(video, mbus: &fmt.format, pix: &format->fmt.pix);
635 return 0;
636}
637
638static int
639iss_video_get_selection(struct file *file, void *fh, struct v4l2_selection *sel)
640{
641 struct iss_video *video = video_drvdata(file);
642 struct v4l2_subdev_format format = {
643 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
644 };
645 struct v4l2_subdev *subdev;
646 struct v4l2_subdev_selection sdsel = {
647 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
648 .target = sel->target,
649 };
650 u32 pad;
651 int ret;
652
653 switch (sel->target) {
654 case V4L2_SEL_TGT_CROP:
655 case V4L2_SEL_TGT_CROP_BOUNDS:
656 case V4L2_SEL_TGT_CROP_DEFAULT:
657 if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
658 return -EINVAL;
659 break;
660 case V4L2_SEL_TGT_COMPOSE:
661 case V4L2_SEL_TGT_COMPOSE_BOUNDS:
662 case V4L2_SEL_TGT_COMPOSE_DEFAULT:
663 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
664 return -EINVAL;
665 break;
666 default:
667 return -EINVAL;
668 }
669 subdev = iss_video_remote_subdev(video, pad: &pad);
670 if (!subdev)
671 return -EINVAL;
672
673 /*
674 * Try the get selection operation first and fallback to get format if
675 * not implemented.
676 */
677 sdsel.pad = pad;
678 ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
679 if (!ret)
680 sel->r = sdsel.r;
681 if (ret != -ENOIOCTLCMD)
682 return ret;
683
684 format.pad = pad;
685 ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
686 if (ret < 0)
687 return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
688
689 sel->r.left = 0;
690 sel->r.top = 0;
691 sel->r.width = format.format.width;
692 sel->r.height = format.format.height;
693
694 return 0;
695}
696
697static int
698iss_video_set_selection(struct file *file, void *fh, struct v4l2_selection *sel)
699{
700 struct iss_video *video = video_drvdata(file);
701 struct v4l2_subdev *subdev;
702 struct v4l2_subdev_selection sdsel = {
703 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
704 .target = sel->target,
705 .flags = sel->flags,
706 .r = sel->r,
707 };
708 u32 pad;
709 int ret;
710
711 switch (sel->target) {
712 case V4L2_SEL_TGT_CROP:
713 if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
714 return -EINVAL;
715 break;
716 case V4L2_SEL_TGT_COMPOSE:
717 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
718 return -EINVAL;
719 break;
720 default:
721 return -EINVAL;
722 }
723 subdev = iss_video_remote_subdev(video, pad: &pad);
724 if (!subdev)
725 return -EINVAL;
726
727 sdsel.pad = pad;
728 mutex_lock(&video->mutex);
729 ret = v4l2_subdev_call(subdev, pad, set_selection, NULL, &sdsel);
730 mutex_unlock(lock: &video->mutex);
731 if (!ret)
732 sel->r = sdsel.r;
733
734 return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
735}
736
737static int
738iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
739{
740 struct iss_video_fh *vfh = to_iss_video_fh(fh);
741 struct iss_video *video = video_drvdata(file);
742
743 if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
744 video->type != a->type)
745 return -EINVAL;
746
747 memset(a, 0, sizeof(*a));
748 a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
749 a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
750 a->parm.output.timeperframe = vfh->timeperframe;
751
752 return 0;
753}
754
755static int
756iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
757{
758 struct iss_video_fh *vfh = to_iss_video_fh(fh);
759 struct iss_video *video = video_drvdata(file);
760
761 if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
762 video->type != a->type)
763 return -EINVAL;
764
765 if (a->parm.output.timeperframe.denominator == 0)
766 a->parm.output.timeperframe.denominator = 1;
767
768 vfh->timeperframe = a->parm.output.timeperframe;
769
770 return 0;
771}
772
773static int
774iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
775{
776 struct iss_video_fh *vfh = to_iss_video_fh(fh);
777
778 return vb2_reqbufs(q: &vfh->queue, req: rb);
779}
780
781static int
782iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
783{
784 struct iss_video_fh *vfh = to_iss_video_fh(fh);
785
786 return vb2_querybuf(q: &vfh->queue, b);
787}
788
789static int
790iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
791{
792 struct iss_video *video = video_drvdata(file);
793 struct iss_video_fh *vfh = to_iss_video_fh(fh);
794
795 return vb2_qbuf(q: &vfh->queue, mdev: video->video.v4l2_dev->mdev, b);
796}
797
798static int
799iss_video_expbuf(struct file *file, void *fh, struct v4l2_exportbuffer *e)
800{
801 struct iss_video_fh *vfh = to_iss_video_fh(fh);
802
803 return vb2_expbuf(q: &vfh->queue, eb: e);
804}
805
806static int
807iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
808{
809 struct iss_video_fh *vfh = to_iss_video_fh(fh);
810
811 return vb2_dqbuf(q: &vfh->queue, b, nonblocking: file->f_flags & O_NONBLOCK);
812}
813
814/*
815 * Stream management
816 *
817 * Every ISS pipeline has a single input and a single output. The input can be
818 * either a sensor or a video node. The output is always a video node.
819 *
820 * As every pipeline has an output video node, the ISS video objects at the
821 * pipeline output stores the pipeline state. It tracks the streaming state of
822 * both the input and output, as well as the availability of buffers.
823 *
824 * In sensor-to-memory mode, frames are always available at the pipeline input.
825 * Starting the sensor usually requires I2C transfers and must be done in
826 * interruptible context. The pipeline is started and stopped synchronously
827 * to the stream on/off commands. All modules in the pipeline will get their
828 * subdev set stream handler called. The module at the end of the pipeline must
829 * delay starting the hardware until buffers are available at its output.
830 *
831 * In memory-to-memory mode, starting/stopping the stream requires
832 * synchronization between the input and output. ISS modules can't be stopped
833 * in the middle of a frame, and at least some of the modules seem to become
834 * busy as soon as they're started, even if they don't receive a frame start
835 * event. For that reason frames need to be processed in single-shot mode. The
836 * driver needs to wait until a frame is completely processed and written to
837 * memory before restarting the pipeline for the next frame. Pipelined
838 * processing might be possible but requires more testing.
839 *
840 * Stream start must be delayed until buffers are available at both the input
841 * and output. The pipeline must be started in the vb2 queue callback with
842 * the buffers queue spinlock held. The modules subdev set stream operation must
843 * not sleep.
844 */
845static int
846iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
847{
848 struct iss_video_fh *vfh = to_iss_video_fh(fh);
849 struct iss_video *video = video_drvdata(file);
850 struct media_device *mdev = video->video.entity.graph_obj.mdev;
851 struct media_pipeline_pad_iter iter;
852 enum iss_pipeline_state state;
853 struct iss_pipeline *pipe;
854 struct iss_video *far_end;
855 struct media_pad *pad;
856 unsigned long flags;
857 int ret;
858
859 if (type != video->type)
860 return -EINVAL;
861
862 mutex_lock(&video->stream_lock);
863
864 /*
865 * Start streaming on the pipeline. No link touching an entity in the
866 * pipeline can be activated or deactivated once streaming is started.
867 */
868 pipe = to_iss_pipeline(entity: &video->video.entity) ? : &video->pipe;
869 pipe->external = NULL;
870 pipe->external_rate = 0;
871 pipe->external_bpp = 0;
872
873 ret = media_entity_enum_init(ent_enum: &pipe->ent_enum, mdev);
874 if (ret)
875 goto err_entity_enum_init;
876
877 if (video->iss->pdata->set_constraints)
878 video->iss->pdata->set_constraints(video->iss, true);
879
880 ret = video_device_pipeline_start(vdev: &video->video, pipe: &pipe->pipe);
881 if (ret < 0)
882 goto err_media_pipeline_start;
883
884 media_pipeline_for_each_pad(&pipe->pipe, &iter, pad)
885 media_entity_enum_set(ent_enum: &pipe->ent_enum, entity: pad->entity);
886
887 /*
888 * Verify that the currently configured format matches the output of
889 * the connected subdev.
890 */
891 ret = iss_video_check_format(video, vfh);
892 if (ret < 0)
893 goto err_iss_video_check_format;
894
895 video->bpl_padding = ret;
896 video->bpl_value = vfh->format.fmt.pix.bytesperline;
897
898 /*
899 * Find the ISS video node connected at the far end of the pipeline and
900 * update the pipeline.
901 */
902 far_end = iss_video_far_end(video, pipe);
903 if (IS_ERR(ptr: far_end)) {
904 ret = PTR_ERR(ptr: far_end);
905 goto err_iss_video_check_format;
906 }
907
908 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
909 state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
910 pipe->input = far_end;
911 pipe->output = video;
912 } else {
913 if (!far_end) {
914 ret = -EPIPE;
915 goto err_iss_video_check_format;
916 }
917
918 state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
919 pipe->input = video;
920 pipe->output = far_end;
921 }
922
923 spin_lock_irqsave(&pipe->lock, flags);
924 pipe->state &= ~ISS_PIPELINE_STREAM;
925 pipe->state |= state;
926 spin_unlock_irqrestore(lock: &pipe->lock, flags);
927
928 /*
929 * Set the maximum time per frame as the value requested by userspace.
930 * This is a soft limit that can be overridden if the hardware doesn't
931 * support the request limit.
932 */
933 if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
934 pipe->max_timeperframe = vfh->timeperframe;
935
936 video->queue = &vfh->queue;
937 INIT_LIST_HEAD(list: &video->dmaqueue);
938 video->error = false;
939 atomic_set(v: &pipe->frame_number, i: -1);
940
941 ret = vb2_streamon(q: &vfh->queue, type);
942 if (ret < 0)
943 goto err_iss_video_check_format;
944
945 /*
946 * In sensor-to-memory mode, the stream can be started synchronously
947 * to the stream on command. In memory-to-memory mode, it will be
948 * started when buffers are queued on both the input and output.
949 */
950 if (!pipe->input) {
951 unsigned long flags;
952
953 ret = omap4iss_pipeline_set_stream(pipe,
954 state: ISS_PIPELINE_STREAM_CONTINUOUS);
955 if (ret < 0)
956 goto err_omap4iss_set_stream;
957 spin_lock_irqsave(&video->qlock, flags);
958 if (list_empty(head: &video->dmaqueue))
959 video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
960 spin_unlock_irqrestore(lock: &video->qlock, flags);
961 }
962
963 mutex_unlock(lock: &video->stream_lock);
964
965 return 0;
966
967err_omap4iss_set_stream:
968 vb2_streamoff(q: &vfh->queue, type);
969err_iss_video_check_format:
970 video_device_pipeline_stop(vdev: &video->video);
971err_media_pipeline_start:
972 if (video->iss->pdata->set_constraints)
973 video->iss->pdata->set_constraints(video->iss, false);
974 video->queue = NULL;
975
976err_entity_enum_init:
977 media_entity_enum_cleanup(ent_enum: &pipe->ent_enum);
978
979 mutex_unlock(lock: &video->stream_lock);
980
981 return ret;
982}
983
984static int
985iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
986{
987 struct iss_video_fh *vfh = to_iss_video_fh(fh);
988 struct iss_video *video = video_drvdata(file);
989 struct iss_pipeline *pipe = to_iss_pipeline(entity: &video->video.entity);
990 enum iss_pipeline_state state;
991 unsigned long flags;
992
993 if (type != video->type)
994 return -EINVAL;
995
996 mutex_lock(&video->stream_lock);
997
998 if (!vb2_is_streaming(q: &vfh->queue))
999 goto done;
1000
1001 /* Update the pipeline state. */
1002 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1003 state = ISS_PIPELINE_STREAM_OUTPUT
1004 | ISS_PIPELINE_QUEUE_OUTPUT;
1005 else
1006 state = ISS_PIPELINE_STREAM_INPUT
1007 | ISS_PIPELINE_QUEUE_INPUT;
1008
1009 spin_lock_irqsave(&pipe->lock, flags);
1010 pipe->state &= ~state;
1011 spin_unlock_irqrestore(lock: &pipe->lock, flags);
1012
1013 /* Stop the stream. */
1014 omap4iss_pipeline_set_stream(pipe, state: ISS_PIPELINE_STREAM_STOPPED);
1015 vb2_streamoff(q: &vfh->queue, type);
1016 video->queue = NULL;
1017
1018 media_entity_enum_cleanup(ent_enum: &pipe->ent_enum);
1019
1020 if (video->iss->pdata->set_constraints)
1021 video->iss->pdata->set_constraints(video->iss, false);
1022 video_device_pipeline_stop(vdev: &video->video);
1023
1024done:
1025 mutex_unlock(lock: &video->stream_lock);
1026 return 0;
1027}
1028
1029static int
1030iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
1031{
1032 if (input->index > 0)
1033 return -EINVAL;
1034
1035 strscpy(input->name, "camera", sizeof(input->name));
1036 input->type = V4L2_INPUT_TYPE_CAMERA;
1037
1038 return 0;
1039}
1040
1041static int
1042iss_video_g_input(struct file *file, void *fh, unsigned int *input)
1043{
1044 *input = 0;
1045
1046 return 0;
1047}
1048
1049static int
1050iss_video_s_input(struct file *file, void *fh, unsigned int input)
1051{
1052 return input == 0 ? 0 : -EINVAL;
1053}
1054
1055static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
1056 .vidioc_querycap = iss_video_querycap,
1057 .vidioc_enum_fmt_vid_cap = iss_video_enum_format,
1058 .vidioc_g_fmt_vid_cap = iss_video_get_format,
1059 .vidioc_s_fmt_vid_cap = iss_video_set_format,
1060 .vidioc_try_fmt_vid_cap = iss_video_try_format,
1061 .vidioc_g_fmt_vid_out = iss_video_get_format,
1062 .vidioc_s_fmt_vid_out = iss_video_set_format,
1063 .vidioc_try_fmt_vid_out = iss_video_try_format,
1064 .vidioc_g_selection = iss_video_get_selection,
1065 .vidioc_s_selection = iss_video_set_selection,
1066 .vidioc_g_parm = iss_video_get_param,
1067 .vidioc_s_parm = iss_video_set_param,
1068 .vidioc_reqbufs = iss_video_reqbufs,
1069 .vidioc_querybuf = iss_video_querybuf,
1070 .vidioc_qbuf = iss_video_qbuf,
1071 .vidioc_expbuf = iss_video_expbuf,
1072 .vidioc_dqbuf = iss_video_dqbuf,
1073 .vidioc_streamon = iss_video_streamon,
1074 .vidioc_streamoff = iss_video_streamoff,
1075 .vidioc_enum_input = iss_video_enum_input,
1076 .vidioc_g_input = iss_video_g_input,
1077 .vidioc_s_input = iss_video_s_input,
1078};
1079
1080/* -----------------------------------------------------------------------------
1081 * V4L2 file operations
1082 */
1083
1084static int iss_video_open(struct file *file)
1085{
1086 struct iss_video *video = video_drvdata(file);
1087 struct iss_video_fh *handle;
1088 struct vb2_queue *q;
1089 int ret = 0;
1090
1091 handle = kzalloc(size: sizeof(*handle), GFP_KERNEL);
1092 if (!handle)
1093 return -ENOMEM;
1094
1095 v4l2_fh_init(fh: &handle->vfh, vdev: &video->video);
1096 v4l2_fh_add(fh: &handle->vfh);
1097
1098 /* If this is the first user, initialise the pipeline. */
1099 if (!omap4iss_get(iss: video->iss)) {
1100 ret = -EBUSY;
1101 goto done;
1102 }
1103
1104 ret = v4l2_pipeline_pm_get(entity: &video->video.entity);
1105 if (ret < 0) {
1106 omap4iss_put(iss: video->iss);
1107 goto done;
1108 }
1109
1110 q = &handle->queue;
1111
1112 q->type = video->type;
1113 q->io_modes = VB2_MMAP | VB2_DMABUF;
1114 q->drv_priv = handle;
1115 q->ops = &iss_video_vb2ops;
1116 q->mem_ops = &vb2_dma_contig_memops;
1117 q->buf_struct_size = sizeof(struct iss_buffer);
1118 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1119 q->dev = video->iss->dev;
1120
1121 ret = vb2_queue_init(q);
1122 if (ret) {
1123 omap4iss_put(iss: video->iss);
1124 goto done;
1125 }
1126
1127 memset(&handle->format, 0, sizeof(handle->format));
1128 handle->format.type = video->type;
1129 handle->timeperframe.denominator = 1;
1130
1131 handle->video = video;
1132 file->private_data = &handle->vfh;
1133
1134done:
1135 if (ret < 0) {
1136 v4l2_fh_del(fh: &handle->vfh);
1137 v4l2_fh_exit(fh: &handle->vfh);
1138 kfree(objp: handle);
1139 }
1140
1141 return ret;
1142}
1143
1144static int iss_video_release(struct file *file)
1145{
1146 struct iss_video *video = video_drvdata(file);
1147 struct v4l2_fh *vfh = file->private_data;
1148 struct iss_video_fh *handle = to_iss_video_fh(vfh);
1149
1150 /* Disable streaming and free the buffers queue resources. */
1151 iss_video_streamoff(file, fh: vfh, type: video->type);
1152
1153 v4l2_pipeline_pm_put(entity: &video->video.entity);
1154
1155 /* Release the videobuf2 queue */
1156 vb2_queue_release(q: &handle->queue);
1157
1158 v4l2_fh_del(fh: vfh);
1159 v4l2_fh_exit(fh: vfh);
1160 kfree(objp: handle);
1161 file->private_data = NULL;
1162
1163 omap4iss_put(iss: video->iss);
1164
1165 return 0;
1166}
1167
1168static __poll_t iss_video_poll(struct file *file, poll_table *wait)
1169{
1170 struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1171
1172 return vb2_poll(q: &vfh->queue, file, wait);
1173}
1174
1175static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
1176{
1177 struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1178
1179 return vb2_mmap(q: &vfh->queue, vma);
1180}
1181
1182static const struct v4l2_file_operations iss_video_fops = {
1183 .owner = THIS_MODULE,
1184 .unlocked_ioctl = video_ioctl2,
1185 .open = iss_video_open,
1186 .release = iss_video_release,
1187 .poll = iss_video_poll,
1188 .mmap = iss_video_mmap,
1189};
1190
1191/* -----------------------------------------------------------------------------
1192 * ISS video core
1193 */
1194
1195static const struct iss_video_operations iss_video_dummy_ops = {
1196};
1197
1198int omap4iss_video_init(struct iss_video *video, const char *name)
1199{
1200 const char *direction;
1201 int ret;
1202
1203 switch (video->type) {
1204 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1205 direction = "output";
1206 video->pad.flags = MEDIA_PAD_FL_SINK;
1207 break;
1208 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1209 direction = "input";
1210 video->pad.flags = MEDIA_PAD_FL_SOURCE;
1211 break;
1212
1213 default:
1214 return -EINVAL;
1215 }
1216
1217 ret = media_entity_pads_init(entity: &video->video.entity, num_pads: 1, pads: &video->pad);
1218 if (ret < 0)
1219 return ret;
1220
1221 spin_lock_init(&video->qlock);
1222 mutex_init(&video->mutex);
1223 atomic_set(v: &video->active, i: 0);
1224
1225 spin_lock_init(&video->pipe.lock);
1226 mutex_init(&video->stream_lock);
1227
1228 /* Initialize the video device. */
1229 if (!video->ops)
1230 video->ops = &iss_video_dummy_ops;
1231
1232 video->video.fops = &iss_video_fops;
1233 snprintf(buf: video->video.name, size: sizeof(video->video.name),
1234 fmt: "OMAP4 ISS %s %s", name, direction);
1235 video->video.vfl_type = VFL_TYPE_VIDEO;
1236 video->video.release = video_device_release_empty;
1237 video->video.ioctl_ops = &iss_video_ioctl_ops;
1238 video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
1239
1240 video_set_drvdata(vdev: &video->video, data: video);
1241
1242 return 0;
1243}
1244
1245void omap4iss_video_cleanup(struct iss_video *video)
1246{
1247 media_entity_cleanup(entity: &video->video.entity);
1248 mutex_destroy(lock: &video->stream_lock);
1249 mutex_destroy(lock: &video->mutex);
1250}
1251
1252int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
1253{
1254 int ret;
1255
1256 video->video.v4l2_dev = vdev;
1257 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1258 video->video.device_caps = V4L2_CAP_VIDEO_CAPTURE;
1259 else
1260 video->video.device_caps = V4L2_CAP_VIDEO_OUTPUT;
1261 video->video.device_caps |= V4L2_CAP_STREAMING;
1262
1263 ret = video_register_device(vdev: &video->video, type: VFL_TYPE_VIDEO, nr: -1);
1264 if (ret < 0)
1265 dev_err(video->iss->dev,
1266 "could not register video device (%d)\n", ret);
1267
1268 return ret;
1269}
1270
1271void omap4iss_video_unregister(struct iss_video *video)
1272{
1273 video_unregister_device(vdev: &video->video);
1274}
1275

source code of linux/drivers/staging/media/omap4iss/iss_video.c