1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Samsung EXYNOS4x12 FIMC-IS (Imaging Subsystem) driver
4  *
5  * FIMC-IS ISP video input and video output DMA interface driver
6  *
7  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
8  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
9  *
10  * The hardware handling code derived from a driver written by
11  * Younghwan Joo <yhwan.joo@samsung.com>.
12  */
13 
14 #include <linux/bitops.h>
15 #include <linux/device.h>
16 #include <linux/delay.h>
17 #include <linux/errno.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/types.h>
21 #include <linux/printk.h>
22 #include <linux/pm_runtime.h>
23 #include <linux/slab.h>
24 #include <linux/videodev2.h>
25 
26 #include <media/v4l2-device.h>
27 #include <media/v4l2-ioctl.h>
28 #include <media/videobuf2-v4l2.h>
29 #include <media/videobuf2-dma-contig.h>
30 #include <media/drv-intf/exynos-fimc.h>
31 
32 #include "common.h"
33 #include "media-dev.h"
34 #include "fimc-is.h"
35 #include "fimc-isp-video.h"
36 #include "fimc-is-param.h"
37 
38 static int isp_video_capture_queue_setup(struct vb2_queue *vq,
39 			unsigned int *num_buffers, unsigned int *num_planes,
40 			unsigned int sizes[], struct device *alloc_devs[])
41 {
42 	struct fimc_isp *isp = vb2_get_drv_priv(vq);
43 	struct v4l2_pix_format_mplane *vid_fmt = &isp->video_capture.pixfmt;
44 	const struct fimc_fmt *fmt = isp->video_capture.format;
45 	unsigned int wh, i;
46 
47 	wh = vid_fmt->width * vid_fmt->height;
48 
49 	if (fmt == NULL)
50 		return -EINVAL;
51 
52 	*num_buffers = clamp_t(u32, *num_buffers, FIMC_ISP_REQ_BUFS_MIN,
53 						FIMC_ISP_REQ_BUFS_MAX);
54 	if (*num_planes) {
55 		if (*num_planes != fmt->memplanes)
56 			return -EINVAL;
57 		for (i = 0; i < *num_planes; i++)
58 			if (sizes[i] < (wh * fmt->depth[i]) / 8)
59 				return -EINVAL;
60 		return 0;
61 	}
62 
63 	*num_planes = fmt->memplanes;
64 
65 	for (i = 0; i < fmt->memplanes; i++)
66 		sizes[i] = (wh * fmt->depth[i]) / 8;
67 
68 	return 0;
69 }
70 
71 static inline struct param_dma_output *__get_isp_dma2(struct fimc_is *is)
72 {
73 	return &__get_curr_is_config(is)->isp.dma2_output;
74 }
75 
76 static int isp_video_capture_start_streaming(struct vb2_queue *q,
77 						unsigned int count)
78 {
79 	struct fimc_isp *isp = vb2_get_drv_priv(q);
80 	struct fimc_is *is = fimc_isp_to_is(isp);
81 	struct param_dma_output *dma = __get_isp_dma2(is);
82 	struct fimc_is_video *video = &isp->video_capture;
83 	int ret;
84 
85 	if (!test_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state) ||
86 	    test_bit(ST_ISP_VID_CAP_STREAMING, &isp->state))
87 		return 0;
88 
89 
90 	dma->cmd = DMA_OUTPUT_COMMAND_ENABLE;
91 	dma->notify_dma_done = DMA_OUTPUT_NOTIFY_DMA_DONE_ENABLE;
92 	dma->buffer_address = is->is_dma_p_region +
93 				DMA2_OUTPUT_ADDR_ARRAY_OFFS;
94 	dma->buffer_number = video->reqbufs_count;
95 	dma->dma_out_mask = video->buf_mask;
96 
97 	isp_dbg(2, &video->ve.vdev,
98 		"buf_count: %d, planes: %d, dma addr table: %#x\n",
99 		video->buf_count, video->format->memplanes,
100 		dma->buffer_address);
101 
102 	fimc_is_mem_barrier();
103 
104 	fimc_is_set_param_bit(is, PARAM_ISP_DMA2_OUTPUT);
105 	__fimc_is_hw_update_param(is, PARAM_ISP_DMA2_OUTPUT);
106 
107 	ret = fimc_is_itf_s_param(is, false);
108 	if (ret < 0)
109 		return ret;
110 
111 	ret = fimc_pipeline_call(&video->ve, set_stream, 1);
112 	if (ret < 0)
113 		return ret;
114 
115 	set_bit(ST_ISP_VID_CAP_STREAMING, &isp->state);
116 	return ret;
117 }
118 
119 static void isp_video_capture_stop_streaming(struct vb2_queue *q)
120 {
121 	struct fimc_isp *isp = vb2_get_drv_priv(q);
122 	struct fimc_is *is = fimc_isp_to_is(isp);
123 	struct param_dma_output *dma = __get_isp_dma2(is);
124 	int ret;
125 
126 	ret = fimc_pipeline_call(&isp->video_capture.ve, set_stream, 0);
127 	if (ret < 0)
128 		return;
129 
130 	dma->cmd = DMA_OUTPUT_COMMAND_DISABLE;
131 	dma->notify_dma_done = DMA_OUTPUT_NOTIFY_DMA_DONE_DISABLE;
132 	dma->buffer_number = 0;
133 	dma->buffer_address = 0;
134 	dma->dma_out_mask = 0;
135 
136 	fimc_is_set_param_bit(is, PARAM_ISP_DMA2_OUTPUT);
137 	__fimc_is_hw_update_param(is, PARAM_ISP_DMA2_OUTPUT);
138 
139 	ret = fimc_is_itf_s_param(is, false);
140 	if (ret < 0)
141 		dev_warn(&is->pdev->dev, "%s: DMA stop failed\n", __func__);
142 
143 	fimc_is_hw_set_isp_buf_mask(is, 0);
144 
145 	clear_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state);
146 	clear_bit(ST_ISP_VID_CAP_STREAMING, &isp->state);
147 
148 	isp->video_capture.buf_count = 0;
149 }
150 
151 static int isp_video_capture_buffer_prepare(struct vb2_buffer *vb)
152 {
153 	struct fimc_isp *isp = vb2_get_drv_priv(vb->vb2_queue);
154 	struct fimc_is_video *video = &isp->video_capture;
155 	int i;
156 
157 	if (video->format == NULL)
158 		return -EINVAL;
159 
160 	for (i = 0; i < video->format->memplanes; i++) {
161 		unsigned long size = video->pixfmt.plane_fmt[i].sizeimage;
162 
163 		if (vb2_plane_size(vb, i) < size) {
164 			v4l2_err(&video->ve.vdev,
165 				 "User buffer too small (%ld < %ld)\n",
166 				 vb2_plane_size(vb, i), size);
167 			return -EINVAL;
168 		}
169 		vb2_set_plane_payload(vb, i, size);
170 	}
171 
172 	/* Check if we get one of the already known buffers. */
173 	if (test_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state)) {
174 		dma_addr_t dma_addr = vb2_dma_contig_plane_dma_addr(vb, 0);
175 		int i;
176 
177 		for (i = 0; i < video->buf_count; i++)
178 			if (video->buffers[i]->dma_addr[0] == dma_addr)
179 				return 0;
180 		return -ENXIO;
181 	}
182 
183 	return 0;
184 }
185 
186 static void isp_video_capture_buffer_queue(struct vb2_buffer *vb)
187 {
188 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
189 	struct fimc_isp *isp = vb2_get_drv_priv(vb->vb2_queue);
190 	struct fimc_is_video *video = &isp->video_capture;
191 	struct fimc_is *is = fimc_isp_to_is(isp);
192 	struct isp_video_buf *ivb = to_isp_video_buf(vbuf);
193 	unsigned long flags;
194 	unsigned int i;
195 
196 	if (test_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state)) {
197 		spin_lock_irqsave(&is->slock, flags);
198 		video->buf_mask |= BIT(ivb->index);
199 		spin_unlock_irqrestore(&is->slock, flags);
200 	} else {
201 		unsigned int num_planes = video->format->memplanes;
202 
203 		ivb->index = video->buf_count;
204 		video->buffers[ivb->index] = ivb;
205 
206 		for (i = 0; i < num_planes; i++) {
207 			int buf_index = ivb->index * num_planes + i;
208 
209 			ivb->dma_addr[i] = vb2_dma_contig_plane_dma_addr(vb, i);
210 			is->is_p_region->shared[32 + buf_index] =
211 							ivb->dma_addr[i];
212 
213 			isp_dbg(2, &video->ve.vdev,
214 				"dma_buf %d (%d/%d/%d) addr: %pad\n",
215 				buf_index, ivb->index, i, vb->index,
216 				&ivb->dma_addr[i]);
217 		}
218 
219 		if (++video->buf_count < video->reqbufs_count)
220 			return;
221 
222 		video->buf_mask = (1UL << video->buf_count) - 1;
223 		set_bit(ST_ISP_VID_CAP_BUF_PREP, &isp->state);
224 	}
225 
226 	if (!test_bit(ST_ISP_VID_CAP_STREAMING, &isp->state))
227 		isp_video_capture_start_streaming(vb->vb2_queue, 0);
228 }
229 
230 /*
231  * FIMC-IS ISP input and output DMA interface interrupt handler.
232  * Locking: called with is->slock spinlock held.
233  */
234 void fimc_isp_video_irq_handler(struct fimc_is *is)
235 {
236 	struct fimc_is_video *video = &is->isp.video_capture;
237 	struct vb2_v4l2_buffer *vbuf;
238 	int buf_index;
239 
240 	/* TODO: Ensure the DMA is really stopped in stop_streaming callback */
241 	if (!test_bit(ST_ISP_VID_CAP_STREAMING, &is->isp.state))
242 		return;
243 
244 	buf_index = (is->i2h_cmd.args[1] - 1) % video->buf_count;
245 	vbuf = &video->buffers[buf_index]->vb;
246 
247 	vbuf->vb2_buf.timestamp = ktime_get_ns();
248 	vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
249 
250 	video->buf_mask &= ~BIT(buf_index);
251 	fimc_is_hw_set_isp_buf_mask(is, video->buf_mask);
252 }
253 
254 static const struct vb2_ops isp_video_capture_qops = {
255 	.queue_setup	 = isp_video_capture_queue_setup,
256 	.buf_prepare	 = isp_video_capture_buffer_prepare,
257 	.buf_queue	 = isp_video_capture_buffer_queue,
258 	.wait_prepare	 = vb2_ops_wait_prepare,
259 	.wait_finish	 = vb2_ops_wait_finish,
260 	.start_streaming = isp_video_capture_start_streaming,
261 	.stop_streaming	 = isp_video_capture_stop_streaming,
262 };
263 
264 static int isp_video_open(struct file *file)
265 {
266 	struct fimc_isp *isp = video_drvdata(file);
267 	struct exynos_video_entity *ve = &isp->video_capture.ve;
268 	struct media_entity *me = &ve->vdev.entity;
269 	int ret;
270 
271 	if (mutex_lock_interruptible(&isp->video_lock))
272 		return -ERESTARTSYS;
273 
274 	ret = v4l2_fh_open(file);
275 	if (ret < 0)
276 		goto unlock;
277 
278 	ret = pm_runtime_resume_and_get(&isp->pdev->dev);
279 	if (ret < 0)
280 		goto rel_fh;
281 
282 	if (v4l2_fh_is_singular_file(file)) {
283 		mutex_lock(&me->graph_obj.mdev->graph_mutex);
284 
285 		ret = fimc_pipeline_call(ve, open, me, true);
286 
287 		/* Mark the video pipeline as in use. */
288 		if (ret == 0)
289 			me->use_count++;
290 
291 		mutex_unlock(&me->graph_obj.mdev->graph_mutex);
292 	}
293 	if (!ret)
294 		goto unlock;
295 rel_fh:
296 	v4l2_fh_release(file);
297 unlock:
298 	mutex_unlock(&isp->video_lock);
299 	return ret;
300 }
301 
302 static int isp_video_release(struct file *file)
303 {
304 	struct fimc_isp *isp = video_drvdata(file);
305 	struct fimc_is_video *ivc = &isp->video_capture;
306 	struct media_entity *entity = &ivc->ve.vdev.entity;
307 	struct media_device *mdev = entity->graph_obj.mdev;
308 	bool is_singular_file;
309 
310 	mutex_lock(&isp->video_lock);
311 
312 	is_singular_file = v4l2_fh_is_singular_file(file);
313 
314 	if (is_singular_file && ivc->streaming) {
315 		video_device_pipeline_stop(&ivc->ve.vdev);
316 		ivc->streaming = 0;
317 	}
318 
319 	_vb2_fop_release(file, NULL);
320 
321 	if (is_singular_file) {
322 		fimc_pipeline_call(&ivc->ve, close);
323 
324 		mutex_lock(&mdev->graph_mutex);
325 		entity->use_count--;
326 		mutex_unlock(&mdev->graph_mutex);
327 	}
328 
329 	pm_runtime_put(&isp->pdev->dev);
330 	mutex_unlock(&isp->video_lock);
331 
332 	return 0;
333 }
334 
335 static const struct v4l2_file_operations isp_video_fops = {
336 	.owner		= THIS_MODULE,
337 	.open		= isp_video_open,
338 	.release	= isp_video_release,
339 	.poll		= vb2_fop_poll,
340 	.unlocked_ioctl	= video_ioctl2,
341 	.mmap		= vb2_fop_mmap,
342 };
343 
344 /*
345  * Video node ioctl operations
346  */
347 static int isp_video_querycap(struct file *file, void *priv,
348 					struct v4l2_capability *cap)
349 {
350 	struct fimc_isp *isp = video_drvdata(file);
351 
352 	__fimc_vidioc_querycap(&isp->pdev->dev, cap);
353 	return 0;
354 }
355 
356 static int isp_video_enum_fmt(struct file *file, void *priv,
357 			      struct v4l2_fmtdesc *f)
358 {
359 	const struct fimc_fmt *fmt;
360 
361 	if (f->index >= FIMC_ISP_NUM_FORMATS)
362 		return -EINVAL;
363 
364 	fmt = fimc_isp_find_format(NULL, NULL, f->index);
365 	if (WARN_ON(fmt == NULL))
366 		return -EINVAL;
367 
368 	f->pixelformat = fmt->fourcc;
369 
370 	return 0;
371 }
372 
373 static int isp_video_g_fmt_mplane(struct file *file, void *fh,
374 					struct v4l2_format *f)
375 {
376 	struct fimc_isp *isp = video_drvdata(file);
377 
378 	f->fmt.pix_mp = isp->video_capture.pixfmt;
379 	return 0;
380 }
381 
382 static void __isp_video_try_fmt(struct fimc_isp *isp,
383 				struct v4l2_pix_format_mplane *pixm,
384 				const struct fimc_fmt **fmt)
385 {
386 	const struct fimc_fmt *__fmt;
387 
388 	__fmt = fimc_isp_find_format(&pixm->pixelformat, NULL, 2);
389 
390 	if (fmt)
391 		*fmt = __fmt;
392 
393 	pixm->colorspace = V4L2_COLORSPACE_SRGB;
394 	pixm->field = V4L2_FIELD_NONE;
395 	pixm->num_planes = __fmt->memplanes;
396 	pixm->pixelformat = __fmt->fourcc;
397 	/*
398 	 * TODO: double check with the docmentation these width/height
399 	 * constraints are correct.
400 	 */
401 	v4l_bound_align_image(&pixm->width, FIMC_ISP_SOURCE_WIDTH_MIN,
402 			      FIMC_ISP_SOURCE_WIDTH_MAX, 3,
403 			      &pixm->height, FIMC_ISP_SOURCE_HEIGHT_MIN,
404 			      FIMC_ISP_SOURCE_HEIGHT_MAX, 0, 0);
405 }
406 
407 static int isp_video_try_fmt_mplane(struct file *file, void *fh,
408 					struct v4l2_format *f)
409 {
410 	struct fimc_isp *isp = video_drvdata(file);
411 
412 	__isp_video_try_fmt(isp, &f->fmt.pix_mp, NULL);
413 	return 0;
414 }
415 
416 static int isp_video_s_fmt_mplane(struct file *file, void *priv,
417 					struct v4l2_format *f)
418 {
419 	struct fimc_isp *isp = video_drvdata(file);
420 	struct fimc_is *is = fimc_isp_to_is(isp);
421 	struct v4l2_pix_format_mplane *pixm = &f->fmt.pix_mp;
422 	const struct fimc_fmt *ifmt = NULL;
423 	struct param_dma_output *dma = __get_isp_dma2(is);
424 
425 	__isp_video_try_fmt(isp, pixm, &ifmt);
426 
427 	if (WARN_ON(ifmt == NULL))
428 		return -EINVAL;
429 
430 	dma->format = DMA_OUTPUT_FORMAT_BAYER;
431 	dma->order = DMA_OUTPUT_ORDER_GB_BG;
432 	dma->plane = ifmt->memplanes;
433 	dma->bitwidth = ifmt->depth[0];
434 	dma->width = pixm->width;
435 	dma->height = pixm->height;
436 
437 	fimc_is_mem_barrier();
438 
439 	isp->video_capture.format = ifmt;
440 	isp->video_capture.pixfmt = *pixm;
441 
442 	return 0;
443 }
444 
445 /*
446  * Check for source/sink format differences at each link.
447  * Return 0 if the formats match or -EPIPE otherwise.
448  */
449 static int isp_video_pipeline_validate(struct fimc_isp *isp)
450 {
451 	struct v4l2_subdev *sd = &isp->subdev;
452 	struct v4l2_subdev_format sink_fmt, src_fmt;
453 	struct media_pad *pad;
454 	int ret;
455 
456 	while (1) {
457 		/* Retrieve format at the sink pad */
458 		pad = &sd->entity.pads[0];
459 		if (!(pad->flags & MEDIA_PAD_FL_SINK))
460 			break;
461 		sink_fmt.pad = pad->index;
462 		sink_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
463 		ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &sink_fmt);
464 		if (ret < 0 && ret != -ENOIOCTLCMD)
465 			return -EPIPE;
466 
467 		/* Retrieve format at the source pad */
468 		pad = media_pad_remote_pad_first(pad);
469 		if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
470 			break;
471 
472 		sd = media_entity_to_v4l2_subdev(pad->entity);
473 		src_fmt.pad = pad->index;
474 		src_fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
475 		ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &src_fmt);
476 		if (ret < 0 && ret != -ENOIOCTLCMD)
477 			return -EPIPE;
478 
479 		if (src_fmt.format.width != sink_fmt.format.width ||
480 		    src_fmt.format.height != sink_fmt.format.height ||
481 		    src_fmt.format.code != sink_fmt.format.code)
482 			return -EPIPE;
483 	}
484 
485 	return 0;
486 }
487 
488 static int isp_video_streamon(struct file *file, void *priv,
489 				      enum v4l2_buf_type type)
490 {
491 	struct fimc_isp *isp = video_drvdata(file);
492 	struct exynos_video_entity *ve = &isp->video_capture.ve;
493 	int ret;
494 
495 	ret = video_device_pipeline_start(&ve->vdev, &ve->pipe->mp);
496 	if (ret < 0)
497 		return ret;
498 
499 	ret = isp_video_pipeline_validate(isp);
500 	if (ret < 0)
501 		goto p_stop;
502 
503 	ret = vb2_ioctl_streamon(file, priv, type);
504 	if (ret < 0)
505 		goto p_stop;
506 
507 	isp->video_capture.streaming = 1;
508 	return 0;
509 p_stop:
510 	video_device_pipeline_stop(&ve->vdev);
511 	return ret;
512 }
513 
514 static int isp_video_streamoff(struct file *file, void *priv,
515 					enum v4l2_buf_type type)
516 {
517 	struct fimc_isp *isp = video_drvdata(file);
518 	struct fimc_is_video *video = &isp->video_capture;
519 	int ret;
520 
521 	ret = vb2_ioctl_streamoff(file, priv, type);
522 	if (ret < 0)
523 		return ret;
524 
525 	video_device_pipeline_stop(&video->ve.vdev);
526 	video->streaming = 0;
527 	return 0;
528 }
529 
530 static int isp_video_reqbufs(struct file *file, void *priv,
531 				struct v4l2_requestbuffers *rb)
532 {
533 	struct fimc_isp *isp = video_drvdata(file);
534 	int ret;
535 
536 	ret = vb2_ioctl_reqbufs(file, priv, rb);
537 	if (ret < 0)
538 		return ret;
539 
540 	if (rb->count && rb->count < FIMC_ISP_REQ_BUFS_MIN) {
541 		rb->count = 0;
542 		vb2_ioctl_reqbufs(file, priv, rb);
543 		ret = -ENOMEM;
544 	}
545 
546 	isp->video_capture.reqbufs_count = rb->count;
547 	return ret;
548 }
549 
550 static const struct v4l2_ioctl_ops isp_video_ioctl_ops = {
551 	.vidioc_querycap		= isp_video_querycap,
552 	.vidioc_enum_fmt_vid_cap	= isp_video_enum_fmt,
553 	.vidioc_try_fmt_vid_cap_mplane	= isp_video_try_fmt_mplane,
554 	.vidioc_s_fmt_vid_cap_mplane	= isp_video_s_fmt_mplane,
555 	.vidioc_g_fmt_vid_cap_mplane	= isp_video_g_fmt_mplane,
556 	.vidioc_reqbufs			= isp_video_reqbufs,
557 	.vidioc_querybuf		= vb2_ioctl_querybuf,
558 	.vidioc_prepare_buf		= vb2_ioctl_prepare_buf,
559 	.vidioc_create_bufs		= vb2_ioctl_create_bufs,
560 	.vidioc_qbuf			= vb2_ioctl_qbuf,
561 	.vidioc_dqbuf			= vb2_ioctl_dqbuf,
562 	.vidioc_streamon		= isp_video_streamon,
563 	.vidioc_streamoff		= isp_video_streamoff,
564 };
565 
566 int fimc_isp_video_device_register(struct fimc_isp *isp,
567 				   struct v4l2_device *v4l2_dev,
568 				   enum v4l2_buf_type type)
569 {
570 	struct vb2_queue *q = &isp->video_capture.vb_queue;
571 	struct fimc_is_video *iv;
572 	struct video_device *vdev;
573 	int ret;
574 
575 	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
576 		iv = &isp->video_capture;
577 	else
578 		return -ENOSYS;
579 
580 	mutex_init(&isp->video_lock);
581 	INIT_LIST_HEAD(&iv->pending_buf_q);
582 	INIT_LIST_HEAD(&iv->active_buf_q);
583 	iv->format = fimc_isp_find_format(NULL, NULL, 0);
584 	iv->pixfmt.width = IS_DEFAULT_WIDTH;
585 	iv->pixfmt.height = IS_DEFAULT_HEIGHT;
586 	iv->pixfmt.pixelformat = iv->format->fourcc;
587 	iv->pixfmt.colorspace = V4L2_COLORSPACE_SRGB;
588 	iv->reqbufs_count = 0;
589 
590 	memset(q, 0, sizeof(*q));
591 	q->type = type;
592 	q->io_modes = VB2_MMAP | VB2_USERPTR;
593 	q->ops = &isp_video_capture_qops;
594 	q->mem_ops = &vb2_dma_contig_memops;
595 	q->buf_struct_size = sizeof(struct isp_video_buf);
596 	q->drv_priv = isp;
597 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
598 	q->lock = &isp->video_lock;
599 	q->dev = &isp->pdev->dev;
600 
601 	ret = vb2_queue_init(q);
602 	if (ret < 0)
603 		return ret;
604 
605 	vdev = &iv->ve.vdev;
606 	memset(vdev, 0, sizeof(*vdev));
607 	strscpy(vdev->name, "fimc-is-isp.capture", sizeof(vdev->name));
608 	vdev->queue = q;
609 	vdev->fops = &isp_video_fops;
610 	vdev->ioctl_ops = &isp_video_ioctl_ops;
611 	vdev->v4l2_dev = v4l2_dev;
612 	vdev->minor = -1;
613 	vdev->release = video_device_release_empty;
614 	vdev->lock = &isp->video_lock;
615 	vdev->device_caps = V4L2_CAP_STREAMING | V4L2_CAP_VIDEO_CAPTURE_MPLANE;
616 
617 	iv->pad.flags = MEDIA_PAD_FL_SINK;
618 	ret = media_entity_pads_init(&vdev->entity, 1, &iv->pad);
619 	if (ret < 0)
620 		return ret;
621 
622 	video_set_drvdata(vdev, isp);
623 
624 	ret = video_register_device(vdev, VFL_TYPE_VIDEO, -1);
625 	if (ret < 0) {
626 		media_entity_cleanup(&vdev->entity);
627 		return ret;
628 	}
629 
630 	v4l2_info(v4l2_dev, "Registered %s as /dev/%s\n",
631 		  vdev->name, video_device_node_name(vdev));
632 
633 	return 0;
634 }
635 
636 void fimc_isp_video_device_unregister(struct fimc_isp *isp,
637 				      enum v4l2_buf_type type)
638 {
639 	struct exynos_video_entity *ve;
640 
641 	if (type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
642 		ve = &isp->video_capture.ve;
643 	else
644 		return;
645 
646 	mutex_lock(&isp->video_lock);
647 
648 	if (video_is_registered(&ve->vdev)) {
649 		video_unregister_device(&ve->vdev);
650 		media_entity_cleanup(&ve->vdev.entity);
651 		ve->pipe = NULL;
652 	}
653 
654 	mutex_unlock(&isp->video_lock);
655 }
656