1 /*
2  * TI OMAP4 ISS V4L2 Driver - Generic video node
3  *
4  * Copyright (C) 2012 Texas Instruments, Inc.
5  *
6  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  */
13 
14 #include <asm/cacheflush.h>
15 #include <linux/clk.h>
16 #include <linux/mm.h>
17 #include <linux/pagemap.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/vmalloc.h>
21 #include <linux/module.h>
22 #include <media/v4l2-dev.h>
23 #include <media/v4l2-ioctl.h>
24 
25 #include "iss_video.h"
26 #include "iss.h"
27 
28 /* -----------------------------------------------------------------------------
29  * Helper functions
30  */
31 
32 static struct iss_format_info formats[] = {
33 	{ MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
34 	  MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
35 	  V4L2_PIX_FMT_GREY, 8, "Greyscale 8 bpp", },
36 	{ MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
37 	  MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
38 	  V4L2_PIX_FMT_Y10, 10, "Greyscale 10 bpp", },
39 	{ MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
40 	  MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
41 	  V4L2_PIX_FMT_Y12, 12, "Greyscale 12 bpp", },
42 	{ MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
43 	  MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
44 	  V4L2_PIX_FMT_SBGGR8, 8, "BGGR Bayer 8 bpp", },
45 	{ MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
46 	  MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
47 	  V4L2_PIX_FMT_SGBRG8, 8, "GBRG Bayer 8 bpp", },
48 	{ MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
49 	  MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
50 	  V4L2_PIX_FMT_SGRBG8, 8, "GRBG Bayer 8 bpp", },
51 	{ MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
52 	  MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
53 	  V4L2_PIX_FMT_SRGGB8, 8, "RGGB Bayer 8 bpp", },
54 	{ MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
55 	  MEDIA_BUS_FMT_SGRBG10_1X10, 0,
56 	  V4L2_PIX_FMT_SGRBG10DPCM8, 8, "GRBG Bayer 10 bpp DPCM8",  },
57 	{ MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
58 	  MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
59 	  V4L2_PIX_FMT_SBGGR10, 10, "BGGR Bayer 10 bpp", },
60 	{ MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
61 	  MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
62 	  V4L2_PIX_FMT_SGBRG10, 10, "GBRG Bayer 10 bpp", },
63 	{ MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
64 	  MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
65 	  V4L2_PIX_FMT_SGRBG10, 10, "GRBG Bayer 10 bpp", },
66 	{ MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
67 	  MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
68 	  V4L2_PIX_FMT_SRGGB10, 10, "RGGB Bayer 10 bpp", },
69 	{ MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
70 	  MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
71 	  V4L2_PIX_FMT_SBGGR12, 12, "BGGR Bayer 12 bpp", },
72 	{ MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
73 	  MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
74 	  V4L2_PIX_FMT_SGBRG12, 12, "GBRG Bayer 12 bpp", },
75 	{ MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
76 	  MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
77 	  V4L2_PIX_FMT_SGRBG12, 12, "GRBG Bayer 12 bpp", },
78 	{ MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
79 	  MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
80 	  V4L2_PIX_FMT_SRGGB12, 12, "RGGB Bayer 12 bpp", },
81 	{ MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
82 	  MEDIA_BUS_FMT_UYVY8_1X16, 0,
83 	  V4L2_PIX_FMT_UYVY, 16, "YUV 4:2:2 (UYVY)", },
84 	{ MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
85 	  MEDIA_BUS_FMT_YUYV8_1X16, 0,
86 	  V4L2_PIX_FMT_YUYV, 16, "YUV 4:2:2 (YUYV)", },
87 	{ MEDIA_BUS_FMT_YUYV8_1_5X8, MEDIA_BUS_FMT_YUYV8_1_5X8,
88 	  MEDIA_BUS_FMT_YUYV8_1_5X8, 0,
89 	  V4L2_PIX_FMT_NV12, 8, "YUV 4:2:0 (NV12)", },
90 };
91 
92 const struct iss_format_info *
omap4iss_video_format_info(u32 code)93 omap4iss_video_format_info(u32 code)
94 {
95 	unsigned int i;
96 
97 	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
98 		if (formats[i].code == code)
99 			return &formats[i];
100 	}
101 
102 	return NULL;
103 }
104 
105 /*
106  * iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
107  * @video: ISS video instance
108  * @mbus: v4l2_mbus_framefmt format (input)
109  * @pix: v4l2_pix_format format (output)
110  *
111  * Fill the output pix structure with information from the input mbus format.
112  * The bytesperline and sizeimage fields are computed from the requested bytes
113  * per line value in the pix format and information from the video instance.
114  *
115  * Return the number of padding bytes at end of line.
116  */
iss_video_mbus_to_pix(const struct iss_video * video,const struct v4l2_mbus_framefmt * mbus,struct v4l2_pix_format * pix)117 static unsigned int iss_video_mbus_to_pix(const struct iss_video *video,
118 					  const struct v4l2_mbus_framefmt *mbus,
119 					  struct v4l2_pix_format *pix)
120 {
121 	unsigned int bpl = pix->bytesperline;
122 	unsigned int min_bpl;
123 	unsigned int i;
124 
125 	memset(pix, 0, sizeof(*pix));
126 	pix->width = mbus->width;
127 	pix->height = mbus->height;
128 
129 	/* Skip the last format in the loop so that it will be selected if no
130 	 * match is found.
131 	 */
132 	for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
133 		if (formats[i].code == mbus->code)
134 			break;
135 	}
136 
137 	min_bpl = pix->width * ALIGN(formats[i].bpp, 8) / 8;
138 
139 	/* Clamp the requested bytes per line value. If the maximum bytes per
140 	 * line value is zero, the module doesn't support user configurable line
141 	 * sizes. Override the requested value with the minimum in that case.
142 	 */
143 	if (video->bpl_max)
144 		bpl = clamp(bpl, min_bpl, video->bpl_max);
145 	else
146 		bpl = min_bpl;
147 
148 	if (!video->bpl_zero_padding || bpl != min_bpl)
149 		bpl = ALIGN(bpl, video->bpl_alignment);
150 
151 	pix->pixelformat = formats[i].pixelformat;
152 	pix->bytesperline = bpl;
153 	pix->sizeimage = pix->bytesperline * pix->height;
154 	pix->colorspace = mbus->colorspace;
155 	pix->field = mbus->field;
156 
157 	/* FIXME: Special case for NV12! We should make this nicer... */
158 	if (pix->pixelformat == V4L2_PIX_FMT_NV12)
159 		pix->sizeimage += (pix->bytesperline * pix->height) / 2;
160 
161 	return bpl - min_bpl;
162 }
163 
iss_video_pix_to_mbus(const struct v4l2_pix_format * pix,struct v4l2_mbus_framefmt * mbus)164 static void iss_video_pix_to_mbus(const struct v4l2_pix_format *pix,
165 				  struct v4l2_mbus_framefmt *mbus)
166 {
167 	unsigned int i;
168 
169 	memset(mbus, 0, sizeof(*mbus));
170 	mbus->width = pix->width;
171 	mbus->height = pix->height;
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 
186 static struct v4l2_subdev *
iss_video_remote_subdev(struct iss_video * video,u32 * pad)187 iss_video_remote_subdev(struct iss_video *video, u32 *pad)
188 {
189 	struct media_pad *remote;
190 
191 	remote = media_entity_remote_pad(&video->pad);
192 
193 	if (!remote ||
194 	    media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
195 		return NULL;
196 
197 	if (pad)
198 		*pad = remote->index;
199 
200 	return media_entity_to_v4l2_subdev(remote->entity);
201 }
202 
203 /* Return a pointer to the ISS video instance at the far end of the pipeline. */
204 static struct iss_video *
iss_video_far_end(struct iss_video * video)205 iss_video_far_end(struct iss_video *video)
206 {
207 	struct media_entity_graph graph;
208 	struct media_entity *entity = &video->video.entity;
209 	struct media_device *mdev = entity->parent;
210 	struct iss_video *far_end = NULL;
211 
212 	mutex_lock(&mdev->graph_mutex);
213 	media_entity_graph_walk_start(&graph, entity);
214 
215 	while ((entity = media_entity_graph_walk_next(&graph))) {
216 		if (entity == &video->video.entity)
217 			continue;
218 
219 		if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
220 			continue;
221 
222 		far_end = to_iss_video(media_entity_to_video_device(entity));
223 		if (far_end->type != video->type)
224 			break;
225 
226 		far_end = NULL;
227 	}
228 
229 	mutex_unlock(&mdev->graph_mutex);
230 	return far_end;
231 }
232 
233 static int
__iss_video_get_format(struct iss_video * video,struct v4l2_mbus_framefmt * format)234 __iss_video_get_format(struct iss_video *video,
235 		       struct v4l2_mbus_framefmt *format)
236 {
237 	struct v4l2_subdev_format fmt;
238 	struct v4l2_subdev *subdev;
239 	u32 pad;
240 	int ret;
241 
242 	subdev = iss_video_remote_subdev(video, &pad);
243 	if (!subdev)
244 		return -EINVAL;
245 
246 	memset(&fmt, 0, sizeof(fmt));
247 	fmt.pad = pad;
248 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
249 
250 	mutex_lock(&video->mutex);
251 	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
252 	mutex_unlock(&video->mutex);
253 
254 	if (ret)
255 		return ret;
256 
257 	*format = fmt.format;
258 	return 0;
259 }
260 
261 static int
iss_video_check_format(struct iss_video * video,struct iss_video_fh * vfh)262 iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
263 {
264 	struct v4l2_mbus_framefmt format;
265 	struct v4l2_pix_format pixfmt;
266 	int ret;
267 
268 	ret = __iss_video_get_format(video, &format);
269 	if (ret < 0)
270 		return ret;
271 
272 	pixfmt.bytesperline = 0;
273 	ret = iss_video_mbus_to_pix(video, &format, &pixfmt);
274 
275 	if (vfh->format.fmt.pix.pixelformat != pixfmt.pixelformat ||
276 	    vfh->format.fmt.pix.height != pixfmt.height ||
277 	    vfh->format.fmt.pix.width != pixfmt.width ||
278 	    vfh->format.fmt.pix.bytesperline != pixfmt.bytesperline ||
279 	    vfh->format.fmt.pix.sizeimage != pixfmt.sizeimage)
280 		return -EINVAL;
281 
282 	return ret;
283 }
284 
285 /* -----------------------------------------------------------------------------
286  * Video queue operations
287  */
288 
iss_video_queue_setup(struct vb2_queue * vq,const void * parg,unsigned int * count,unsigned int * num_planes,unsigned int sizes[],void * alloc_ctxs[])289 static int iss_video_queue_setup(struct vb2_queue *vq,
290 				 const void *parg,
291 				 unsigned int *count, unsigned int *num_planes,
292 				 unsigned int sizes[], void *alloc_ctxs[])
293 {
294 	struct iss_video_fh *vfh = vb2_get_drv_priv(vq);
295 	struct iss_video *video = vfh->video;
296 
297 	/* Revisit multi-planar support for NV12 */
298 	*num_planes = 1;
299 
300 	sizes[0] = vfh->format.fmt.pix.sizeimage;
301 	if (sizes[0] == 0)
302 		return -EINVAL;
303 
304 	alloc_ctxs[0] = video->alloc_ctx;
305 
306 	*count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));
307 
308 	return 0;
309 }
310 
iss_video_buf_cleanup(struct vb2_buffer * vb)311 static void iss_video_buf_cleanup(struct vb2_buffer *vb)
312 {
313 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
314 	struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
315 
316 	if (buffer->iss_addr)
317 		buffer->iss_addr = 0;
318 }
319 
iss_video_buf_prepare(struct vb2_buffer * vb)320 static int iss_video_buf_prepare(struct vb2_buffer *vb)
321 {
322 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
323 	struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
324 	struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
325 	struct iss_video *video = vfh->video;
326 	unsigned long size = vfh->format.fmt.pix.sizeimage;
327 	dma_addr_t addr;
328 
329 	if (vb2_plane_size(vb, 0) < size)
330 		return -ENOBUFS;
331 
332 	addr = vb2_dma_contig_plane_dma_addr(vb, 0);
333 	if (!IS_ALIGNED(addr, 32)) {
334 		dev_dbg(video->iss->dev,
335 			"Buffer address must be aligned to 32 bytes boundary.\n");
336 		return -EINVAL;
337 	}
338 
339 	vb2_set_plane_payload(vb, 0, size);
340 	buffer->iss_addr = addr;
341 	return 0;
342 }
343 
iss_video_buf_queue(struct vb2_buffer * vb)344 static void iss_video_buf_queue(struct vb2_buffer *vb)
345 {
346 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
347 	struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
348 	struct iss_video *video = vfh->video;
349 	struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
350 	struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
351 	unsigned long flags;
352 	bool empty;
353 
354 	spin_lock_irqsave(&video->qlock, flags);
355 
356 	/* Mark the buffer is faulty and give it back to the queue immediately
357 	 * if the video node has registered an error. vb2 will perform the same
358 	 * check when preparing the buffer, but that is inherently racy, so we
359 	 * need to handle the race condition with an authoritative check here.
360 	 */
361 	if (unlikely(video->error)) {
362 		vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
363 		spin_unlock_irqrestore(&video->qlock, flags);
364 		return;
365 	}
366 
367 	empty = list_empty(&video->dmaqueue);
368 	list_add_tail(&buffer->list, &video->dmaqueue);
369 
370 	spin_unlock_irqrestore(&video->qlock, flags);
371 
372 	if (empty) {
373 		enum iss_pipeline_state state;
374 		unsigned int start;
375 
376 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
377 			state = ISS_PIPELINE_QUEUE_OUTPUT;
378 		else
379 			state = ISS_PIPELINE_QUEUE_INPUT;
380 
381 		spin_lock_irqsave(&pipe->lock, flags);
382 		pipe->state |= state;
383 		video->ops->queue(video, buffer);
384 		video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
385 
386 		start = iss_pipeline_ready(pipe);
387 		if (start)
388 			pipe->state |= ISS_PIPELINE_STREAM;
389 		spin_unlock_irqrestore(&pipe->lock, flags);
390 
391 		if (start)
392 			omap4iss_pipeline_set_stream(pipe,
393 						ISS_PIPELINE_STREAM_SINGLESHOT);
394 	}
395 }
396 
397 static const struct vb2_ops iss_video_vb2ops = {
398 	.queue_setup	= iss_video_queue_setup,
399 	.buf_prepare	= iss_video_buf_prepare,
400 	.buf_queue	= iss_video_buf_queue,
401 	.buf_cleanup	= iss_video_buf_cleanup,
402 };
403 
404 /*
405  * omap4iss_video_buffer_next - Complete the current buffer and return the next
406  * @video: ISS video object
407  *
408  * Remove the current video buffer from the DMA queue and fill its timestamp,
409  * field count and state fields before waking up its completion handler.
410  *
411  * For capture video nodes, the buffer state is set to VB2_BUF_STATE_DONE if no
412  * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
413  *
414  * The DMA queue is expected to contain at least one buffer.
415  *
416  * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
417  * empty.
418  */
omap4iss_video_buffer_next(struct iss_video * video)419 struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
420 {
421 	struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
422 	enum iss_pipeline_state state;
423 	struct iss_buffer *buf;
424 	unsigned long flags;
425 
426 	spin_lock_irqsave(&video->qlock, flags);
427 	if (WARN_ON(list_empty(&video->dmaqueue))) {
428 		spin_unlock_irqrestore(&video->qlock, flags);
429 		return NULL;
430 	}
431 
432 	buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
433 			       list);
434 	list_del(&buf->list);
435 	spin_unlock_irqrestore(&video->qlock, flags);
436 
437 	v4l2_get_timestamp(&buf->vb.timestamp);
438 
439 	/* Do frame number propagation only if this is the output video node.
440 	 * Frame number either comes from the CSI receivers or it gets
441 	 * incremented here if H3A is not active.
442 	 * Note: There is no guarantee that the output buffer will finish
443 	 * first, so the input number might lag behind by 1 in some cases.
444 	 */
445 	if (video == pipe->output && !pipe->do_propagation)
446 		buf->vb.sequence =
447 			atomic_inc_return(&pipe->frame_number);
448 	else
449 		buf->vb.sequence = atomic_read(&pipe->frame_number);
450 
451 	vb2_buffer_done(&buf->vb.vb2_buf, pipe->error ?
452 			VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
453 	pipe->error = false;
454 
455 	spin_lock_irqsave(&video->qlock, flags);
456 	if (list_empty(&video->dmaqueue)) {
457 		spin_unlock_irqrestore(&video->qlock, flags);
458 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
459 			state = ISS_PIPELINE_QUEUE_OUTPUT
460 			      | ISS_PIPELINE_STREAM;
461 		else
462 			state = ISS_PIPELINE_QUEUE_INPUT
463 			      | ISS_PIPELINE_STREAM;
464 
465 		spin_lock_irqsave(&pipe->lock, flags);
466 		pipe->state &= ~state;
467 		if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
468 			video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
469 		spin_unlock_irqrestore(&pipe->lock, flags);
470 		return NULL;
471 	}
472 
473 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input) {
474 		spin_lock(&pipe->lock);
475 		pipe->state &= ~ISS_PIPELINE_STREAM;
476 		spin_unlock(&pipe->lock);
477 	}
478 
479 	buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
480 			       list);
481 	spin_unlock_irqrestore(&video->qlock, flags);
482 	buf->vb.vb2_buf.state = VB2_BUF_STATE_ACTIVE;
483 	return buf;
484 }
485 
486 /*
487  * omap4iss_video_cancel_stream - Cancel stream on a video node
488  * @video: ISS video object
489  *
490  * Cancelling a stream mark all buffers on the video node as erroneous and makes
491  * sure no new buffer can be queued.
492  */
omap4iss_video_cancel_stream(struct iss_video * video)493 void omap4iss_video_cancel_stream(struct iss_video *video)
494 {
495 	unsigned long flags;
496 
497 	spin_lock_irqsave(&video->qlock, flags);
498 
499 	while (!list_empty(&video->dmaqueue)) {
500 		struct iss_buffer *buf;
501 
502 		buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
503 				       list);
504 		list_del(&buf->list);
505 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
506 	}
507 
508 	vb2_queue_error(video->queue);
509 	video->error = true;
510 
511 	spin_unlock_irqrestore(&video->qlock, flags);
512 }
513 
514 /* -----------------------------------------------------------------------------
515  * V4L2 ioctls
516  */
517 
518 static int
iss_video_querycap(struct file * file,void * fh,struct v4l2_capability * cap)519 iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
520 {
521 	struct iss_video *video = video_drvdata(file);
522 
523 	strlcpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
524 	strlcpy(cap->card, video->video.name, sizeof(cap->card));
525 	strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));
526 
527 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
528 		cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
529 	else
530 		cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
531 
532 	cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
533 			  | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT;
534 
535 	return 0;
536 }
537 
538 static int
iss_video_enum_format(struct file * file,void * fh,struct v4l2_fmtdesc * f)539 iss_video_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
540 {
541 	struct iss_video *video = video_drvdata(file);
542 	struct v4l2_mbus_framefmt format;
543 	unsigned int index = f->index;
544 	unsigned int i;
545 	int ret;
546 
547 	if (f->type != video->type)
548 		return -EINVAL;
549 
550 	ret = __iss_video_get_format(video, &format);
551 	if (ret < 0)
552 		return ret;
553 
554 	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
555 		const struct iss_format_info *info = &formats[i];
556 
557 		if (format.code != info->code)
558 			continue;
559 
560 		if (index == 0) {
561 			f->pixelformat = info->pixelformat;
562 			strlcpy(f->description, info->description,
563 				sizeof(f->description));
564 			return 0;
565 		}
566 
567 		index--;
568 	}
569 
570 	return -EINVAL;
571 }
572 
573 static int
iss_video_get_format(struct file * file,void * fh,struct v4l2_format * format)574 iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
575 {
576 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
577 	struct iss_video *video = video_drvdata(file);
578 
579 	if (format->type != video->type)
580 		return -EINVAL;
581 
582 	mutex_lock(&video->mutex);
583 	*format = vfh->format;
584 	mutex_unlock(&video->mutex);
585 
586 	return 0;
587 }
588 
589 static int
iss_video_set_format(struct file * file,void * fh,struct v4l2_format * format)590 iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
591 {
592 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
593 	struct iss_video *video = video_drvdata(file);
594 	struct v4l2_mbus_framefmt fmt;
595 
596 	if (format->type != video->type)
597 		return -EINVAL;
598 
599 	mutex_lock(&video->mutex);
600 
601 	/* Fill the bytesperline and sizeimage fields by converting to media bus
602 	 * format and back to pixel format.
603 	 */
604 	iss_video_pix_to_mbus(&format->fmt.pix, &fmt);
605 	iss_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
606 
607 	vfh->format = *format;
608 
609 	mutex_unlock(&video->mutex);
610 	return 0;
611 }
612 
613 static int
iss_video_try_format(struct file * file,void * fh,struct v4l2_format * format)614 iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
615 {
616 	struct iss_video *video = video_drvdata(file);
617 	struct v4l2_subdev_format fmt;
618 	struct v4l2_subdev *subdev;
619 	u32 pad;
620 	int ret;
621 
622 	if (format->type != video->type)
623 		return -EINVAL;
624 
625 	subdev = iss_video_remote_subdev(video, &pad);
626 	if (!subdev)
627 		return -EINVAL;
628 
629 	iss_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
630 
631 	fmt.pad = pad;
632 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
633 	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
634 	if (ret)
635 		return ret;
636 
637 	iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
638 	return 0;
639 }
640 
641 static int
iss_video_get_param(struct file * file,void * fh,struct v4l2_streamparm * a)642 iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
643 {
644 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
645 	struct iss_video *video = video_drvdata(file);
646 
647 	if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
648 	    video->type != a->type)
649 		return -EINVAL;
650 
651 	memset(a, 0, sizeof(*a));
652 	a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
653 	a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
654 	a->parm.output.timeperframe = vfh->timeperframe;
655 
656 	return 0;
657 }
658 
659 static int
iss_video_set_param(struct file * file,void * fh,struct v4l2_streamparm * a)660 iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
661 {
662 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
663 	struct iss_video *video = video_drvdata(file);
664 
665 	if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
666 	    video->type != a->type)
667 		return -EINVAL;
668 
669 	if (a->parm.output.timeperframe.denominator == 0)
670 		a->parm.output.timeperframe.denominator = 1;
671 
672 	vfh->timeperframe = a->parm.output.timeperframe;
673 
674 	return 0;
675 }
676 
677 static int
iss_video_reqbufs(struct file * file,void * fh,struct v4l2_requestbuffers * rb)678 iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
679 {
680 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
681 
682 	return vb2_reqbufs(&vfh->queue, rb);
683 }
684 
685 static int
iss_video_querybuf(struct file * file,void * fh,struct v4l2_buffer * b)686 iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
687 {
688 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
689 
690 	return vb2_querybuf(&vfh->queue, b);
691 }
692 
693 static int
iss_video_qbuf(struct file * file,void * fh,struct v4l2_buffer * b)694 iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
695 {
696 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
697 
698 	return vb2_qbuf(&vfh->queue, b);
699 }
700 
701 static int
iss_video_expbuf(struct file * file,void * fh,struct v4l2_exportbuffer * e)702 iss_video_expbuf(struct file *file, void *fh, struct v4l2_exportbuffer *e)
703 {
704 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
705 
706 	return vb2_expbuf(&vfh->queue, e);
707 }
708 
709 static int
iss_video_dqbuf(struct file * file,void * fh,struct v4l2_buffer * b)710 iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
711 {
712 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
713 
714 	return vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
715 }
716 
717 /*
718  * Stream management
719  *
720  * Every ISS pipeline has a single input and a single output. The input can be
721  * either a sensor or a video node. The output is always a video node.
722  *
723  * As every pipeline has an output video node, the ISS video objects at the
724  * pipeline output stores the pipeline state. It tracks the streaming state of
725  * both the input and output, as well as the availability of buffers.
726  *
727  * In sensor-to-memory mode, frames are always available at the pipeline input.
728  * Starting the sensor usually requires I2C transfers and must be done in
729  * interruptible context. The pipeline is started and stopped synchronously
730  * to the stream on/off commands. All modules in the pipeline will get their
731  * subdev set stream handler called. The module at the end of the pipeline must
732  * delay starting the hardware until buffers are available at its output.
733  *
734  * In memory-to-memory mode, starting/stopping the stream requires
735  * synchronization between the input and output. ISS modules can't be stopped
736  * in the middle of a frame, and at least some of the modules seem to become
737  * busy as soon as they're started, even if they don't receive a frame start
738  * event. For that reason frames need to be processed in single-shot mode. The
739  * driver needs to wait until a frame is completely processed and written to
740  * memory before restarting the pipeline for the next frame. Pipelined
741  * processing might be possible but requires more testing.
742  *
743  * Stream start must be delayed until buffers are available at both the input
744  * and output. The pipeline must be started in the videobuf queue callback with
745  * the buffers queue spinlock held. The modules subdev set stream operation must
746  * not sleep.
747  */
748 static int
iss_video_streamon(struct file * file,void * fh,enum v4l2_buf_type type)749 iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
750 {
751 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
752 	struct iss_video *video = video_drvdata(file);
753 	struct media_entity_graph graph;
754 	struct media_entity *entity;
755 	enum iss_pipeline_state state;
756 	struct iss_pipeline *pipe;
757 	struct iss_video *far_end;
758 	unsigned long flags;
759 	int ret;
760 
761 	if (type != video->type)
762 		return -EINVAL;
763 
764 	mutex_lock(&video->stream_lock);
765 
766 	/* Start streaming on the pipeline. No link touching an entity in the
767 	 * pipeline can be activated or deactivated once streaming is started.
768 	 */
769 	pipe = video->video.entity.pipe
770 	     ? to_iss_pipeline(&video->video.entity) : &video->pipe;
771 	pipe->external = NULL;
772 	pipe->external_rate = 0;
773 	pipe->external_bpp = 0;
774 	pipe->entities = 0;
775 
776 	if (video->iss->pdata->set_constraints)
777 		video->iss->pdata->set_constraints(video->iss, true);
778 
779 	ret = media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
780 	if (ret < 0)
781 		goto err_media_entity_pipeline_start;
782 
783 	entity = &video->video.entity;
784 	media_entity_graph_walk_start(&graph, entity);
785 	while ((entity = media_entity_graph_walk_next(&graph)))
786 		pipe->entities |= 1 << entity->id;
787 
788 	/* Verify that the currently configured format matches the output of
789 	 * the connected subdev.
790 	 */
791 	ret = iss_video_check_format(video, vfh);
792 	if (ret < 0)
793 		goto err_iss_video_check_format;
794 
795 	video->bpl_padding = ret;
796 	video->bpl_value = vfh->format.fmt.pix.bytesperline;
797 
798 	/* Find the ISS video node connected at the far end of the pipeline and
799 	 * update the pipeline.
800 	 */
801 	far_end = iss_video_far_end(video);
802 
803 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
804 		state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
805 		pipe->input = far_end;
806 		pipe->output = video;
807 	} else {
808 		if (!far_end) {
809 			ret = -EPIPE;
810 			goto err_iss_video_check_format;
811 		}
812 
813 		state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
814 		pipe->input = video;
815 		pipe->output = far_end;
816 	}
817 
818 	spin_lock_irqsave(&pipe->lock, flags);
819 	pipe->state &= ~ISS_PIPELINE_STREAM;
820 	pipe->state |= state;
821 	spin_unlock_irqrestore(&pipe->lock, flags);
822 
823 	/* Set the maximum time per frame as the value requested by userspace.
824 	 * This is a soft limit that can be overridden if the hardware doesn't
825 	 * support the request limit.
826 	 */
827 	if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
828 		pipe->max_timeperframe = vfh->timeperframe;
829 
830 	video->queue = &vfh->queue;
831 	INIT_LIST_HEAD(&video->dmaqueue);
832 	video->error = false;
833 	atomic_set(&pipe->frame_number, -1);
834 
835 	ret = vb2_streamon(&vfh->queue, type);
836 	if (ret < 0)
837 		goto err_iss_video_check_format;
838 
839 	/* In sensor-to-memory mode, the stream can be started synchronously
840 	 * to the stream on command. In memory-to-memory mode, it will be
841 	 * started when buffers are queued on both the input and output.
842 	 */
843 	if (!pipe->input) {
844 		unsigned long flags;
845 
846 		ret = omap4iss_pipeline_set_stream(pipe,
847 					      ISS_PIPELINE_STREAM_CONTINUOUS);
848 		if (ret < 0)
849 			goto err_omap4iss_set_stream;
850 		spin_lock_irqsave(&video->qlock, flags);
851 		if (list_empty(&video->dmaqueue))
852 			video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
853 		spin_unlock_irqrestore(&video->qlock, flags);
854 	}
855 
856 	mutex_unlock(&video->stream_lock);
857 	return 0;
858 
859 err_omap4iss_set_stream:
860 	vb2_streamoff(&vfh->queue, type);
861 err_iss_video_check_format:
862 	media_entity_pipeline_stop(&video->video.entity);
863 err_media_entity_pipeline_start:
864 	if (video->iss->pdata->set_constraints)
865 		video->iss->pdata->set_constraints(video->iss, false);
866 	video->queue = NULL;
867 
868 	mutex_unlock(&video->stream_lock);
869 	return ret;
870 }
871 
872 static int
iss_video_streamoff(struct file * file,void * fh,enum v4l2_buf_type type)873 iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
874 {
875 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
876 	struct iss_video *video = video_drvdata(file);
877 	struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
878 	enum iss_pipeline_state state;
879 	unsigned long flags;
880 
881 	if (type != video->type)
882 		return -EINVAL;
883 
884 	mutex_lock(&video->stream_lock);
885 
886 	if (!vb2_is_streaming(&vfh->queue))
887 		goto done;
888 
889 	/* Update the pipeline state. */
890 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
891 		state = ISS_PIPELINE_STREAM_OUTPUT
892 		      | ISS_PIPELINE_QUEUE_OUTPUT;
893 	else
894 		state = ISS_PIPELINE_STREAM_INPUT
895 		      | ISS_PIPELINE_QUEUE_INPUT;
896 
897 	spin_lock_irqsave(&pipe->lock, flags);
898 	pipe->state &= ~state;
899 	spin_unlock_irqrestore(&pipe->lock, flags);
900 
901 	/* Stop the stream. */
902 	omap4iss_pipeline_set_stream(pipe, ISS_PIPELINE_STREAM_STOPPED);
903 	vb2_streamoff(&vfh->queue, type);
904 	video->queue = NULL;
905 
906 	if (video->iss->pdata->set_constraints)
907 		video->iss->pdata->set_constraints(video->iss, false);
908 	media_entity_pipeline_stop(&video->video.entity);
909 
910 done:
911 	mutex_unlock(&video->stream_lock);
912 	return 0;
913 }
914 
915 static int
iss_video_enum_input(struct file * file,void * fh,struct v4l2_input * input)916 iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
917 {
918 	if (input->index > 0)
919 		return -EINVAL;
920 
921 	strlcpy(input->name, "camera", sizeof(input->name));
922 	input->type = V4L2_INPUT_TYPE_CAMERA;
923 
924 	return 0;
925 }
926 
927 static int
iss_video_g_input(struct file * file,void * fh,unsigned int * input)928 iss_video_g_input(struct file *file, void *fh, unsigned int *input)
929 {
930 	*input = 0;
931 
932 	return 0;
933 }
934 
935 static int
iss_video_s_input(struct file * file,void * fh,unsigned int input)936 iss_video_s_input(struct file *file, void *fh, unsigned int input)
937 {
938 	return input == 0 ? 0 : -EINVAL;
939 }
940 
941 static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
942 	.vidioc_querycap		= iss_video_querycap,
943 	.vidioc_enum_fmt_vid_cap        = iss_video_enum_format,
944 	.vidioc_g_fmt_vid_cap		= iss_video_get_format,
945 	.vidioc_s_fmt_vid_cap		= iss_video_set_format,
946 	.vidioc_try_fmt_vid_cap		= iss_video_try_format,
947 	.vidioc_g_fmt_vid_out		= iss_video_get_format,
948 	.vidioc_s_fmt_vid_out		= iss_video_set_format,
949 	.vidioc_try_fmt_vid_out		= iss_video_try_format,
950 	.vidioc_g_parm			= iss_video_get_param,
951 	.vidioc_s_parm			= iss_video_set_param,
952 	.vidioc_reqbufs			= iss_video_reqbufs,
953 	.vidioc_querybuf		= iss_video_querybuf,
954 	.vidioc_qbuf			= iss_video_qbuf,
955 	.vidioc_expbuf			= iss_video_expbuf,
956 	.vidioc_dqbuf			= iss_video_dqbuf,
957 	.vidioc_streamon		= iss_video_streamon,
958 	.vidioc_streamoff		= iss_video_streamoff,
959 	.vidioc_enum_input		= iss_video_enum_input,
960 	.vidioc_g_input			= iss_video_g_input,
961 	.vidioc_s_input			= iss_video_s_input,
962 };
963 
964 /* -----------------------------------------------------------------------------
965  * V4L2 file operations
966  */
967 
iss_video_open(struct file * file)968 static int iss_video_open(struct file *file)
969 {
970 	struct iss_video *video = video_drvdata(file);
971 	struct iss_video_fh *handle;
972 	struct vb2_queue *q;
973 	int ret = 0;
974 
975 	handle = kzalloc(sizeof(*handle), GFP_KERNEL);
976 	if (!handle)
977 		return -ENOMEM;
978 
979 	v4l2_fh_init(&handle->vfh, &video->video);
980 	v4l2_fh_add(&handle->vfh);
981 
982 	/* If this is the first user, initialise the pipeline. */
983 	if (!omap4iss_get(video->iss)) {
984 		ret = -EBUSY;
985 		goto done;
986 	}
987 
988 	ret = omap4iss_pipeline_pm_use(&video->video.entity, 1);
989 	if (ret < 0) {
990 		omap4iss_put(video->iss);
991 		goto done;
992 	}
993 
994 	video->alloc_ctx = vb2_dma_contig_init_ctx(video->iss->dev);
995 	if (IS_ERR(video->alloc_ctx)) {
996 		ret = PTR_ERR(video->alloc_ctx);
997 		omap4iss_put(video->iss);
998 		goto done;
999 	}
1000 
1001 	q = &handle->queue;
1002 
1003 	q->type = video->type;
1004 	q->io_modes = VB2_MMAP | VB2_DMABUF;
1005 	q->drv_priv = handle;
1006 	q->ops = &iss_video_vb2ops;
1007 	q->mem_ops = &vb2_dma_contig_memops;
1008 	q->buf_struct_size = sizeof(struct iss_buffer);
1009 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1010 
1011 	ret = vb2_queue_init(q);
1012 	if (ret) {
1013 		omap4iss_put(video->iss);
1014 		goto done;
1015 	}
1016 
1017 	memset(&handle->format, 0, sizeof(handle->format));
1018 	handle->format.type = video->type;
1019 	handle->timeperframe.denominator = 1;
1020 
1021 	handle->video = video;
1022 	file->private_data = &handle->vfh;
1023 
1024 done:
1025 	if (ret < 0) {
1026 		v4l2_fh_del(&handle->vfh);
1027 		kfree(handle);
1028 	}
1029 
1030 	return ret;
1031 }
1032 
iss_video_release(struct file * file)1033 static int iss_video_release(struct file *file)
1034 {
1035 	struct iss_video *video = video_drvdata(file);
1036 	struct v4l2_fh *vfh = file->private_data;
1037 	struct iss_video_fh *handle = to_iss_video_fh(vfh);
1038 
1039 	/* Disable streaming and free the buffers queue resources. */
1040 	iss_video_streamoff(file, vfh, video->type);
1041 
1042 	omap4iss_pipeline_pm_use(&video->video.entity, 0);
1043 
1044 	/* Release the videobuf2 queue */
1045 	vb2_queue_release(&handle->queue);
1046 
1047 	/* Release the file handle. */
1048 	v4l2_fh_del(vfh);
1049 	kfree(handle);
1050 	file->private_data = NULL;
1051 
1052 	omap4iss_put(video->iss);
1053 
1054 	return 0;
1055 }
1056 
iss_video_poll(struct file * file,poll_table * wait)1057 static unsigned int iss_video_poll(struct file *file, poll_table *wait)
1058 {
1059 	struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1060 
1061 	return vb2_poll(&vfh->queue, file, wait);
1062 }
1063 
iss_video_mmap(struct file * file,struct vm_area_struct * vma)1064 static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
1065 {
1066 	struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1067 
1068 	return vb2_mmap(&vfh->queue, vma);
1069 }
1070 
1071 static struct v4l2_file_operations iss_video_fops = {
1072 	.owner = THIS_MODULE,
1073 	.unlocked_ioctl = video_ioctl2,
1074 	.open = iss_video_open,
1075 	.release = iss_video_release,
1076 	.poll = iss_video_poll,
1077 	.mmap = iss_video_mmap,
1078 };
1079 
1080 /* -----------------------------------------------------------------------------
1081  * ISS video core
1082  */
1083 
1084 static const struct iss_video_operations iss_video_dummy_ops = {
1085 };
1086 
omap4iss_video_init(struct iss_video * video,const char * name)1087 int omap4iss_video_init(struct iss_video *video, const char *name)
1088 {
1089 	const char *direction;
1090 	int ret;
1091 
1092 	switch (video->type) {
1093 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1094 		direction = "output";
1095 		video->pad.flags = MEDIA_PAD_FL_SINK;
1096 		break;
1097 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1098 		direction = "input";
1099 		video->pad.flags = MEDIA_PAD_FL_SOURCE;
1100 		break;
1101 
1102 	default:
1103 		return -EINVAL;
1104 	}
1105 
1106 	ret = media_entity_init(&video->video.entity, 1, &video->pad, 0);
1107 	if (ret < 0)
1108 		return ret;
1109 
1110 	spin_lock_init(&video->qlock);
1111 	mutex_init(&video->mutex);
1112 	atomic_set(&video->active, 0);
1113 
1114 	spin_lock_init(&video->pipe.lock);
1115 	mutex_init(&video->stream_lock);
1116 
1117 	/* Initialize the video device. */
1118 	if (!video->ops)
1119 		video->ops = &iss_video_dummy_ops;
1120 
1121 	video->video.fops = &iss_video_fops;
1122 	snprintf(video->video.name, sizeof(video->video.name),
1123 		 "OMAP4 ISS %s %s", name, direction);
1124 	video->video.vfl_type = VFL_TYPE_GRABBER;
1125 	video->video.release = video_device_release_empty;
1126 	video->video.ioctl_ops = &iss_video_ioctl_ops;
1127 	video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
1128 
1129 	video_set_drvdata(&video->video, video);
1130 
1131 	return 0;
1132 }
1133 
omap4iss_video_cleanup(struct iss_video * video)1134 void omap4iss_video_cleanup(struct iss_video *video)
1135 {
1136 	media_entity_cleanup(&video->video.entity);
1137 	mutex_destroy(&video->stream_lock);
1138 	mutex_destroy(&video->mutex);
1139 }
1140 
omap4iss_video_register(struct iss_video * video,struct v4l2_device * vdev)1141 int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
1142 {
1143 	int ret;
1144 
1145 	video->video.v4l2_dev = vdev;
1146 
1147 	ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1148 	if (ret < 0)
1149 		dev_err(video->iss->dev,
1150 			"could not register video device (%d)\n", ret);
1151 
1152 	return ret;
1153 }
1154 
omap4iss_video_unregister(struct iss_video * video)1155 void omap4iss_video_unregister(struct iss_video *video)
1156 {
1157 	video_unregister_device(&video->video);
1158 }
1159