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 <asm/cacheflush.h>
23 
24 #include "iss_video.h"
25 #include "iss.h"
26 
27 /* -----------------------------------------------------------------------------
28  * Helper functions
29  */
30 
31 static struct iss_format_info formats[] = {
32 	{ MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
33 	  MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
34 	  V4L2_PIX_FMT_GREY, 8, },
35 	{ MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
36 	  MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
37 	  V4L2_PIX_FMT_Y10, 10, },
38 	{ MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
39 	  MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
40 	  V4L2_PIX_FMT_Y12, 12, },
41 	{ MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
42 	  MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
43 	  V4L2_PIX_FMT_SBGGR8, 8, },
44 	{ MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
45 	  MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
46 	  V4L2_PIX_FMT_SGBRG8, 8, },
47 	{ MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
48 	  MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
49 	  V4L2_PIX_FMT_SGRBG8, 8, },
50 	{ MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
51 	  MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
52 	  V4L2_PIX_FMT_SRGGB8, 8, },
53 	{ MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
54 	  MEDIA_BUS_FMT_SGRBG10_1X10, 0,
55 	  V4L2_PIX_FMT_SGRBG10DPCM8, 8, },
56 	{ MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
57 	  MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
58 	  V4L2_PIX_FMT_SBGGR10, 10, },
59 	{ MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
60 	  MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
61 	  V4L2_PIX_FMT_SGBRG10, 10, },
62 	{ MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
63 	  MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
64 	  V4L2_PIX_FMT_SGRBG10, 10, },
65 	{ MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
66 	  MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
67 	  V4L2_PIX_FMT_SRGGB10, 10, },
68 	{ MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
69 	  MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
70 	  V4L2_PIX_FMT_SBGGR12, 12, },
71 	{ MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
72 	  MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
73 	  V4L2_PIX_FMT_SGBRG12, 12, },
74 	{ MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
75 	  MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
76 	  V4L2_PIX_FMT_SGRBG12, 12, },
77 	{ MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
78 	  MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
79 	  V4L2_PIX_FMT_SRGGB12, 12, },
80 	{ MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
81 	  MEDIA_BUS_FMT_UYVY8_1X16, 0,
82 	  V4L2_PIX_FMT_UYVY, 16, },
83 	{ MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
84 	  MEDIA_BUS_FMT_YUYV8_1X16, 0,
85 	  V4L2_PIX_FMT_YUYV, 16, },
86 	{ MEDIA_BUS_FMT_YUYV8_1_5X8, MEDIA_BUS_FMT_YUYV8_1_5X8,
87 	  MEDIA_BUS_FMT_YUYV8_1_5X8, 0,
88 	  V4L2_PIX_FMT_NV12, 8, },
89 };
90 
91 const struct iss_format_info *
omap4iss_video_format_info(u32 code)92 omap4iss_video_format_info(u32 code)
93 {
94 	unsigned int i;
95 
96 	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
97 		if (formats[i].code == code)
98 			return &formats[i];
99 	}
100 
101 	return NULL;
102 }
103 
104 /*
105  * iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
106  * @video: ISS video instance
107  * @mbus: v4l2_mbus_framefmt format (input)
108  * @pix: v4l2_pix_format format (output)
109  *
110  * Fill the output pix structure with information from the input mbus format.
111  * The bytesperline and sizeimage fields are computed from the requested bytes
112  * per line value in the pix format and information from the video instance.
113  *
114  * Return the number of padding bytes at end of line.
115  */
iss_video_mbus_to_pix(const struct iss_video * video,const struct v4l2_mbus_framefmt * mbus,struct v4l2_pix_format * pix)116 static unsigned int iss_video_mbus_to_pix(const struct iss_video *video,
117 					  const struct v4l2_mbus_framefmt *mbus,
118 					  struct v4l2_pix_format *pix)
119 {
120 	unsigned int bpl = pix->bytesperline;
121 	unsigned int min_bpl;
122 	unsigned int i;
123 
124 	memset(pix, 0, sizeof(*pix));
125 	pix->width = mbus->width;
126 	pix->height = mbus->height;
127 
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 	/*
140 	 * Clamp the requested bytes per line value. If the maximum bytes per
141 	 * line value is zero, the module doesn't support user configurable line
142 	 * sizes. Override the requested value with the minimum in that case.
143 	 */
144 	if (video->bpl_max)
145 		bpl = clamp(bpl, min_bpl, video->bpl_max);
146 	else
147 		bpl = min_bpl;
148 
149 	if (!video->bpl_zero_padding || bpl != min_bpl)
150 		bpl = ALIGN(bpl, video->bpl_alignment);
151 
152 	pix->pixelformat = formats[i].pixelformat;
153 	pix->bytesperline = bpl;
154 	pix->sizeimage = pix->bytesperline * pix->height;
155 	pix->colorspace = mbus->colorspace;
156 	pix->field = mbus->field;
157 
158 	/* FIXME: Special case for NV12! We should make this nicer... */
159 	if (pix->pixelformat == V4L2_PIX_FMT_NV12)
160 		pix->sizeimage += (pix->bytesperline * pix->height) / 2;
161 
162 	return bpl - min_bpl;
163 }
164 
iss_video_pix_to_mbus(const struct v4l2_pix_format * pix,struct v4l2_mbus_framefmt * mbus)165 static void iss_video_pix_to_mbus(const struct v4l2_pix_format *pix,
166 				  struct v4l2_mbus_framefmt *mbus)
167 {
168 	unsigned int i;
169 
170 	memset(mbus, 0, sizeof(*mbus));
171 	mbus->width = pix->width;
172 	mbus->height = pix->height;
173 
174 	/*
175 	 * Skip the last format in the loop so that it will be selected if no
176 	 * match is found.
177 	 */
178 	for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
179 		if (formats[i].pixelformat == pix->pixelformat)
180 			break;
181 	}
182 
183 	mbus->code = formats[i].code;
184 	mbus->colorspace = pix->colorspace;
185 	mbus->field = pix->field;
186 }
187 
188 static struct v4l2_subdev *
iss_video_remote_subdev(struct iss_video * video,u32 * pad)189 iss_video_remote_subdev(struct iss_video *video, u32 *pad)
190 {
191 	struct media_pad *remote;
192 
193 	remote = media_entity_remote_pad(&video->pad);
194 
195 	if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
196 		return NULL;
197 
198 	if (pad)
199 		*pad = remote->index;
200 
201 	return media_entity_to_v4l2_subdev(remote->entity);
202 }
203 
204 /* Return a pointer to the ISS video instance at the far end of the pipeline. */
205 static struct iss_video *
iss_video_far_end(struct iss_video * video)206 iss_video_far_end(struct iss_video *video)
207 {
208 	struct media_graph graph;
209 	struct media_entity *entity = &video->video.entity;
210 	struct media_device *mdev = entity->graph_obj.mdev;
211 	struct iss_video *far_end = NULL;
212 
213 	mutex_lock(&mdev->graph_mutex);
214 
215 	if (media_graph_walk_init(&graph, mdev)) {
216 		mutex_unlock(&mdev->graph_mutex);
217 		return NULL;
218 	}
219 
220 	media_graph_walk_start(&graph, entity);
221 
222 	while ((entity = media_graph_walk_next(&graph))) {
223 		if (entity == &video->video.entity)
224 			continue;
225 
226 		if (!is_media_entity_v4l2_video_device(entity))
227 			continue;
228 
229 		far_end = to_iss_video(media_entity_to_video_device(entity));
230 		if (far_end->type != video->type)
231 			break;
232 
233 		far_end = NULL;
234 	}
235 
236 	mutex_unlock(&mdev->graph_mutex);
237 
238 	media_graph_walk_cleanup(&graph);
239 
240 	return far_end;
241 }
242 
243 static int
__iss_video_get_format(struct iss_video * video,struct v4l2_mbus_framefmt * format)244 __iss_video_get_format(struct iss_video *video,
245 		       struct v4l2_mbus_framefmt *format)
246 {
247 	struct v4l2_subdev_format fmt;
248 	struct v4l2_subdev *subdev;
249 	u32 pad;
250 	int ret;
251 
252 	subdev = iss_video_remote_subdev(video, &pad);
253 	if (!subdev)
254 		return -EINVAL;
255 
256 	memset(&fmt, 0, sizeof(fmt));
257 	fmt.pad = pad;
258 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
259 
260 	mutex_lock(&video->mutex);
261 	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
262 	mutex_unlock(&video->mutex);
263 
264 	if (ret)
265 		return ret;
266 
267 	*format = fmt.format;
268 	return 0;
269 }
270 
271 static int
iss_video_check_format(struct iss_video * video,struct iss_video_fh * vfh)272 iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
273 {
274 	struct v4l2_mbus_framefmt format;
275 	struct v4l2_pix_format pixfmt;
276 	int ret;
277 
278 	ret = __iss_video_get_format(video, &format);
279 	if (ret < 0)
280 		return ret;
281 
282 	pixfmt.bytesperline = 0;
283 	ret = iss_video_mbus_to_pix(video, &format, &pixfmt);
284 
285 	if (vfh->format.fmt.pix.pixelformat != pixfmt.pixelformat ||
286 	    vfh->format.fmt.pix.height != pixfmt.height ||
287 	    vfh->format.fmt.pix.width != pixfmt.width ||
288 	    vfh->format.fmt.pix.bytesperline != pixfmt.bytesperline ||
289 	    vfh->format.fmt.pix.sizeimage != pixfmt.sizeimage)
290 		return -EINVAL;
291 
292 	return ret;
293 }
294 
295 /* -----------------------------------------------------------------------------
296  * Video queue operations
297  */
298 
iss_video_queue_setup(struct vb2_queue * vq,unsigned int * count,unsigned int * num_planes,unsigned int sizes[],struct device * alloc_devs[])299 static int iss_video_queue_setup(struct vb2_queue *vq,
300 				 unsigned int *count, unsigned int *num_planes,
301 				 unsigned int sizes[],
302 				 struct device *alloc_devs[])
303 {
304 	struct iss_video_fh *vfh = vb2_get_drv_priv(vq);
305 	struct iss_video *video = vfh->video;
306 
307 	/* Revisit multi-planar support for NV12 */
308 	*num_planes = 1;
309 
310 	sizes[0] = vfh->format.fmt.pix.sizeimage;
311 	if (sizes[0] == 0)
312 		return -EINVAL;
313 
314 	*count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));
315 
316 	return 0;
317 }
318 
iss_video_buf_cleanup(struct vb2_buffer * vb)319 static void iss_video_buf_cleanup(struct vb2_buffer *vb)
320 {
321 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
322 	struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
323 
324 	if (buffer->iss_addr)
325 		buffer->iss_addr = 0;
326 }
327 
iss_video_buf_prepare(struct vb2_buffer * vb)328 static int iss_video_buf_prepare(struct vb2_buffer *vb)
329 {
330 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
331 	struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
332 	struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
333 	struct iss_video *video = vfh->video;
334 	unsigned long size = vfh->format.fmt.pix.sizeimage;
335 	dma_addr_t addr;
336 
337 	if (vb2_plane_size(vb, 0) < size)
338 		return -ENOBUFS;
339 
340 	addr = vb2_dma_contig_plane_dma_addr(vb, 0);
341 	if (!IS_ALIGNED(addr, 32)) {
342 		dev_dbg(video->iss->dev,
343 			"Buffer address must be aligned to 32 bytes boundary.\n");
344 		return -EINVAL;
345 	}
346 
347 	vb2_set_plane_payload(vb, 0, size);
348 	buffer->iss_addr = addr;
349 	return 0;
350 }
351 
iss_video_buf_queue(struct vb2_buffer * vb)352 static void iss_video_buf_queue(struct vb2_buffer *vb)
353 {
354 	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
355 	struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
356 	struct iss_video *video = vfh->video;
357 	struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
358 	struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
359 	unsigned long flags;
360 	bool empty;
361 
362 	spin_lock_irqsave(&video->qlock, flags);
363 
364 	/*
365 	 * Mark the buffer is faulty and give it back to the queue immediately
366 	 * if the video node has registered an error. vb2 will perform the same
367 	 * check when preparing the buffer, but that is inherently racy, so we
368 	 * need to handle the race condition with an authoritative check here.
369 	 */
370 	if (unlikely(video->error)) {
371 		vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
372 		spin_unlock_irqrestore(&video->qlock, flags);
373 		return;
374 	}
375 
376 	empty = list_empty(&video->dmaqueue);
377 	list_add_tail(&buffer->list, &video->dmaqueue);
378 
379 	spin_unlock_irqrestore(&video->qlock, flags);
380 
381 	if (empty) {
382 		enum iss_pipeline_state state;
383 		unsigned int start;
384 
385 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
386 			state = ISS_PIPELINE_QUEUE_OUTPUT;
387 		else
388 			state = ISS_PIPELINE_QUEUE_INPUT;
389 
390 		spin_lock_irqsave(&pipe->lock, flags);
391 		pipe->state |= state;
392 		video->ops->queue(video, buffer);
393 		video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
394 
395 		start = iss_pipeline_ready(pipe);
396 		if (start)
397 			pipe->state |= ISS_PIPELINE_STREAM;
398 		spin_unlock_irqrestore(&pipe->lock, flags);
399 
400 		if (start)
401 			omap4iss_pipeline_set_stream(pipe,
402 						     ISS_PIPELINE_STREAM_SINGLESHOT);
403 	}
404 }
405 
406 static const struct vb2_ops iss_video_vb2ops = {
407 	.queue_setup	= iss_video_queue_setup,
408 	.buf_prepare	= iss_video_buf_prepare,
409 	.buf_queue	= iss_video_buf_queue,
410 	.buf_cleanup	= iss_video_buf_cleanup,
411 };
412 
413 /*
414  * omap4iss_video_buffer_next - Complete the current buffer and return the next
415  * @video: ISS video object
416  *
417  * Remove the current video buffer from the DMA queue and fill its timestamp,
418  * field count and state fields before waking up its completion handler.
419  *
420  * For capture video nodes, the buffer state is set to VB2_BUF_STATE_DONE if no
421  * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
422  *
423  * The DMA queue is expected to contain at least one buffer.
424  *
425  * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
426  * empty.
427  */
omap4iss_video_buffer_next(struct iss_video * video)428 struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
429 {
430 	struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
431 	enum iss_pipeline_state state;
432 	struct iss_buffer *buf;
433 	unsigned long flags;
434 
435 	spin_lock_irqsave(&video->qlock, flags);
436 	if (WARN_ON(list_empty(&video->dmaqueue))) {
437 		spin_unlock_irqrestore(&video->qlock, flags);
438 		return NULL;
439 	}
440 
441 	buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
442 			       list);
443 	list_del(&buf->list);
444 	spin_unlock_irqrestore(&video->qlock, flags);
445 
446 	buf->vb.vb2_buf.timestamp = ktime_get_ns();
447 
448 	/*
449 	 * Do frame number propagation only if this is the output video node.
450 	 * Frame number either comes from the CSI receivers or it gets
451 	 * incremented here if H3A is not active.
452 	 * Note: There is no guarantee that the output buffer will finish
453 	 * first, so the input number might lag behind by 1 in some cases.
454 	 */
455 	if (video == pipe->output && !pipe->do_propagation)
456 		buf->vb.sequence =
457 			atomic_inc_return(&pipe->frame_number);
458 	else
459 		buf->vb.sequence = atomic_read(&pipe->frame_number);
460 
461 	vb2_buffer_done(&buf->vb.vb2_buf, pipe->error ?
462 			VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
463 	pipe->error = false;
464 
465 	spin_lock_irqsave(&video->qlock, flags);
466 	if (list_empty(&video->dmaqueue)) {
467 		spin_unlock_irqrestore(&video->qlock, flags);
468 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
469 			state = ISS_PIPELINE_QUEUE_OUTPUT
470 			      | ISS_PIPELINE_STREAM;
471 		else
472 			state = ISS_PIPELINE_QUEUE_INPUT
473 			      | ISS_PIPELINE_STREAM;
474 
475 		spin_lock_irqsave(&pipe->lock, flags);
476 		pipe->state &= ~state;
477 		if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
478 			video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
479 		spin_unlock_irqrestore(&pipe->lock, flags);
480 		return NULL;
481 	}
482 
483 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input) {
484 		spin_lock(&pipe->lock);
485 		pipe->state &= ~ISS_PIPELINE_STREAM;
486 		spin_unlock(&pipe->lock);
487 	}
488 
489 	buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
490 			       list);
491 	spin_unlock_irqrestore(&video->qlock, flags);
492 	buf->vb.vb2_buf.state = VB2_BUF_STATE_ACTIVE;
493 	return buf;
494 }
495 
496 /*
497  * omap4iss_video_cancel_stream - Cancel stream on a video node
498  * @video: ISS video object
499  *
500  * Cancelling a stream mark all buffers on the video node as erroneous and makes
501  * sure no new buffer can be queued.
502  */
omap4iss_video_cancel_stream(struct iss_video * video)503 void omap4iss_video_cancel_stream(struct iss_video *video)
504 {
505 	unsigned long flags;
506 
507 	spin_lock_irqsave(&video->qlock, flags);
508 
509 	while (!list_empty(&video->dmaqueue)) {
510 		struct iss_buffer *buf;
511 
512 		buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
513 				       list);
514 		list_del(&buf->list);
515 		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
516 	}
517 
518 	vb2_queue_error(video->queue);
519 	video->error = true;
520 
521 	spin_unlock_irqrestore(&video->qlock, flags);
522 }
523 
524 /* -----------------------------------------------------------------------------
525  * V4L2 ioctls
526  */
527 
528 static int
iss_video_querycap(struct file * file,void * fh,struct v4l2_capability * cap)529 iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
530 {
531 	struct iss_video *video = video_drvdata(file);
532 
533 	strscpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
534 	strscpy(cap->card, video->video.name, sizeof(cap->card));
535 	strscpy(cap->bus_info, "media", sizeof(cap->bus_info));
536 	cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
537 			  | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT;
538 
539 	return 0;
540 }
541 
542 static int
iss_video_enum_format(struct file * file,void * fh,struct v4l2_fmtdesc * f)543 iss_video_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
544 {
545 	struct iss_video *video = video_drvdata(file);
546 	struct v4l2_mbus_framefmt format;
547 	unsigned int index = f->index;
548 	unsigned int i;
549 	int ret;
550 
551 	if (f->type != video->type)
552 		return -EINVAL;
553 
554 	ret = __iss_video_get_format(video, &format);
555 	if (ret < 0)
556 		return ret;
557 
558 	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
559 		const struct iss_format_info *info = &formats[i];
560 
561 		if (format.code != info->code)
562 			continue;
563 
564 		if (index == 0) {
565 			f->pixelformat = info->pixelformat;
566 			return 0;
567 		}
568 
569 		index--;
570 	}
571 
572 	return -EINVAL;
573 }
574 
575 static int
iss_video_get_format(struct file * file,void * fh,struct v4l2_format * format)576 iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
577 {
578 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
579 	struct iss_video *video = video_drvdata(file);
580 
581 	if (format->type != video->type)
582 		return -EINVAL;
583 
584 	mutex_lock(&video->mutex);
585 	*format = vfh->format;
586 	mutex_unlock(&video->mutex);
587 
588 	return 0;
589 }
590 
591 static int
iss_video_set_format(struct file * file,void * fh,struct v4l2_format * format)592 iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
593 {
594 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
595 	struct iss_video *video = video_drvdata(file);
596 	struct v4l2_mbus_framefmt fmt;
597 
598 	if (format->type != video->type)
599 		return -EINVAL;
600 
601 	mutex_lock(&video->mutex);
602 
603 	/*
604 	 * Fill the bytesperline and sizeimage fields by converting to media bus
605 	 * format and back to pixel format.
606 	 */
607 	iss_video_pix_to_mbus(&format->fmt.pix, &fmt);
608 	iss_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
609 
610 	vfh->format = *format;
611 
612 	mutex_unlock(&video->mutex);
613 	return 0;
614 }
615 
616 static int
iss_video_try_format(struct file * file,void * fh,struct v4l2_format * format)617 iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
618 {
619 	struct iss_video *video = video_drvdata(file);
620 	struct v4l2_subdev_format fmt;
621 	struct v4l2_subdev *subdev;
622 	u32 pad;
623 	int ret;
624 
625 	if (format->type != video->type)
626 		return -EINVAL;
627 
628 	subdev = iss_video_remote_subdev(video, &pad);
629 	if (!subdev)
630 		return -EINVAL;
631 
632 	iss_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
633 
634 	fmt.pad = pad;
635 	fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
636 	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
637 	if (ret)
638 		return ret;
639 
640 	iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
641 	return 0;
642 }
643 
644 static int
iss_video_get_selection(struct file * file,void * fh,struct v4l2_selection * sel)645 iss_video_get_selection(struct file *file, void *fh, struct v4l2_selection *sel)
646 {
647 	struct iss_video *video = video_drvdata(file);
648 	struct v4l2_subdev_format format;
649 	struct v4l2_subdev *subdev;
650 	struct v4l2_subdev_selection sdsel = {
651 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
652 		.target = sel->target,
653 	};
654 	u32 pad;
655 	int ret;
656 
657 	switch (sel->target) {
658 	case V4L2_SEL_TGT_CROP:
659 	case V4L2_SEL_TGT_CROP_BOUNDS:
660 	case V4L2_SEL_TGT_CROP_DEFAULT:
661 		if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
662 			return -EINVAL;
663 		break;
664 	case V4L2_SEL_TGT_COMPOSE:
665 	case V4L2_SEL_TGT_COMPOSE_BOUNDS:
666 	case V4L2_SEL_TGT_COMPOSE_DEFAULT:
667 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
668 			return -EINVAL;
669 		break;
670 	default:
671 		return -EINVAL;
672 	}
673 	subdev = iss_video_remote_subdev(video, &pad);
674 	if (!subdev)
675 		return -EINVAL;
676 
677 	/*
678 	 * Try the get selection operation first and fallback to get format if
679 	 * not implemented.
680 	 */
681 	sdsel.pad = pad;
682 	ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
683 	if (!ret)
684 		sel->r = sdsel.r;
685 	if (ret != -ENOIOCTLCMD)
686 		return ret;
687 
688 	format.pad = pad;
689 	format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
690 	ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
691 	if (ret < 0)
692 		return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
693 
694 	sel->r.left = 0;
695 	sel->r.top = 0;
696 	sel->r.width = format.format.width;
697 	sel->r.height = format.format.height;
698 
699 	return 0;
700 }
701 
702 static int
iss_video_set_selection(struct file * file,void * fh,struct v4l2_selection * sel)703 iss_video_set_selection(struct file *file, void *fh, struct v4l2_selection *sel)
704 {
705 	struct iss_video *video = video_drvdata(file);
706 	struct v4l2_subdev *subdev;
707 	struct v4l2_subdev_selection sdsel = {
708 		.which = V4L2_SUBDEV_FORMAT_ACTIVE,
709 		.target = sel->target,
710 		.flags = sel->flags,
711 		.r = sel->r,
712 	};
713 	u32 pad;
714 	int ret;
715 
716 	switch (sel->target) {
717 	case V4L2_SEL_TGT_CROP:
718 		if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
719 			return -EINVAL;
720 		break;
721 	case V4L2_SEL_TGT_COMPOSE:
722 		if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
723 			return -EINVAL;
724 		break;
725 	default:
726 		return -EINVAL;
727 	}
728 	subdev = iss_video_remote_subdev(video, &pad);
729 	if (!subdev)
730 		return -EINVAL;
731 
732 	sdsel.pad = pad;
733 	mutex_lock(&video->mutex);
734 	ret = v4l2_subdev_call(subdev, pad, set_selection, NULL, &sdsel);
735 	mutex_unlock(&video->mutex);
736 	if (!ret)
737 		sel->r = sdsel.r;
738 
739 	return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
740 }
741 
742 static int
iss_video_get_param(struct file * file,void * fh,struct v4l2_streamparm * a)743 iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
744 {
745 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
746 	struct iss_video *video = video_drvdata(file);
747 
748 	if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
749 	    video->type != a->type)
750 		return -EINVAL;
751 
752 	memset(a, 0, sizeof(*a));
753 	a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
754 	a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
755 	a->parm.output.timeperframe = vfh->timeperframe;
756 
757 	return 0;
758 }
759 
760 static int
iss_video_set_param(struct file * file,void * fh,struct v4l2_streamparm * a)761 iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
762 {
763 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
764 	struct iss_video *video = video_drvdata(file);
765 
766 	if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
767 	    video->type != a->type)
768 		return -EINVAL;
769 
770 	if (a->parm.output.timeperframe.denominator == 0)
771 		a->parm.output.timeperframe.denominator = 1;
772 
773 	vfh->timeperframe = a->parm.output.timeperframe;
774 
775 	return 0;
776 }
777 
778 static int
iss_video_reqbufs(struct file * file,void * fh,struct v4l2_requestbuffers * rb)779 iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
780 {
781 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
782 
783 	return vb2_reqbufs(&vfh->queue, rb);
784 }
785 
786 static int
iss_video_querybuf(struct file * file,void * fh,struct v4l2_buffer * b)787 iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
788 {
789 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
790 
791 	return vb2_querybuf(&vfh->queue, b);
792 }
793 
794 static int
iss_video_qbuf(struct file * file,void * fh,struct v4l2_buffer * b)795 iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
796 {
797 	struct iss_video *video = video_drvdata(file);
798 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
799 
800 	return vb2_qbuf(&vfh->queue, video->video.v4l2_dev->mdev, b);
801 }
802 
803 static int
iss_video_expbuf(struct file * file,void * fh,struct v4l2_exportbuffer * e)804 iss_video_expbuf(struct file *file, void *fh, struct v4l2_exportbuffer *e)
805 {
806 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
807 
808 	return vb2_expbuf(&vfh->queue, e);
809 }
810 
811 static int
iss_video_dqbuf(struct file * file,void * fh,struct v4l2_buffer * b)812 iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
813 {
814 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
815 
816 	return vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
817 }
818 
819 /*
820  * Stream management
821  *
822  * Every ISS pipeline has a single input and a single output. The input can be
823  * either a sensor or a video node. The output is always a video node.
824  *
825  * As every pipeline has an output video node, the ISS video objects at the
826  * pipeline output stores the pipeline state. It tracks the streaming state of
827  * both the input and output, as well as the availability of buffers.
828  *
829  * In sensor-to-memory mode, frames are always available at the pipeline input.
830  * Starting the sensor usually requires I2C transfers and must be done in
831  * interruptible context. The pipeline is started and stopped synchronously
832  * to the stream on/off commands. All modules in the pipeline will get their
833  * subdev set stream handler called. The module at the end of the pipeline must
834  * delay starting the hardware until buffers are available at its output.
835  *
836  * In memory-to-memory mode, starting/stopping the stream requires
837  * synchronization between the input and output. ISS modules can't be stopped
838  * in the middle of a frame, and at least some of the modules seem to become
839  * busy as soon as they're started, even if they don't receive a frame start
840  * event. For that reason frames need to be processed in single-shot mode. The
841  * driver needs to wait until a frame is completely processed and written to
842  * memory before restarting the pipeline for the next frame. Pipelined
843  * processing might be possible but requires more testing.
844  *
845  * Stream start must be delayed until buffers are available at both the input
846  * and output. The pipeline must be started in the videobuf queue callback with
847  * the buffers queue spinlock held. The modules subdev set stream operation must
848  * not sleep.
849  */
850 static int
iss_video_streamon(struct file * file,void * fh,enum v4l2_buf_type type)851 iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
852 {
853 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
854 	struct iss_video *video = video_drvdata(file);
855 	struct media_graph graph;
856 	struct media_entity *entity = &video->video.entity;
857 	struct media_device *mdev = entity->graph_obj.mdev;
858 	enum iss_pipeline_state state;
859 	struct iss_pipeline *pipe;
860 	struct iss_video *far_end;
861 	unsigned long flags;
862 	int ret;
863 
864 	if (type != video->type)
865 		return -EINVAL;
866 
867 	mutex_lock(&video->stream_lock);
868 
869 	/*
870 	 * Start streaming on the pipeline. No link touching an entity in the
871 	 * pipeline can be activated or deactivated once streaming is started.
872 	 */
873 	pipe = entity->pipe
874 	     ? to_iss_pipeline(entity) : &video->pipe;
875 	pipe->external = NULL;
876 	pipe->external_rate = 0;
877 	pipe->external_bpp = 0;
878 
879 	ret = media_entity_enum_init(&pipe->ent_enum, entity->graph_obj.mdev);
880 	if (ret)
881 		goto err_graph_walk_init;
882 
883 	ret = media_graph_walk_init(&graph, entity->graph_obj.mdev);
884 	if (ret)
885 		goto err_graph_walk_init;
886 
887 	if (video->iss->pdata->set_constraints)
888 		video->iss->pdata->set_constraints(video->iss, true);
889 
890 	ret = media_pipeline_start(entity, &pipe->pipe);
891 	if (ret < 0)
892 		goto err_media_pipeline_start;
893 
894 	mutex_lock(&mdev->graph_mutex);
895 	media_graph_walk_start(&graph, entity);
896 	while ((entity = media_graph_walk_next(&graph)))
897 		media_entity_enum_set(&pipe->ent_enum, entity);
898 	mutex_unlock(&mdev->graph_mutex);
899 
900 	/*
901 	 * Verify that the currently configured format matches the output of
902 	 * the connected subdev.
903 	 */
904 	ret = iss_video_check_format(video, vfh);
905 	if (ret < 0)
906 		goto err_iss_video_check_format;
907 
908 	video->bpl_padding = ret;
909 	video->bpl_value = vfh->format.fmt.pix.bytesperline;
910 
911 	/*
912 	 * Find the ISS video node connected at the far end of the pipeline and
913 	 * update the pipeline.
914 	 */
915 	far_end = iss_video_far_end(video);
916 
917 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
918 		state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
919 		pipe->input = far_end;
920 		pipe->output = video;
921 	} else {
922 		if (!far_end) {
923 			ret = -EPIPE;
924 			goto err_iss_video_check_format;
925 		}
926 
927 		state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
928 		pipe->input = video;
929 		pipe->output = far_end;
930 	}
931 
932 	spin_lock_irqsave(&pipe->lock, flags);
933 	pipe->state &= ~ISS_PIPELINE_STREAM;
934 	pipe->state |= state;
935 	spin_unlock_irqrestore(&pipe->lock, flags);
936 
937 	/*
938 	 * Set the maximum time per frame as the value requested by userspace.
939 	 * This is a soft limit that can be overridden if the hardware doesn't
940 	 * support the request limit.
941 	 */
942 	if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
943 		pipe->max_timeperframe = vfh->timeperframe;
944 
945 	video->queue = &vfh->queue;
946 	INIT_LIST_HEAD(&video->dmaqueue);
947 	video->error = false;
948 	atomic_set(&pipe->frame_number, -1);
949 
950 	ret = vb2_streamon(&vfh->queue, type);
951 	if (ret < 0)
952 		goto err_iss_video_check_format;
953 
954 	/*
955 	 * In sensor-to-memory mode, the stream can be started synchronously
956 	 * to the stream on command. In memory-to-memory mode, it will be
957 	 * started when buffers are queued on both the input and output.
958 	 */
959 	if (!pipe->input) {
960 		unsigned long flags;
961 
962 		ret = omap4iss_pipeline_set_stream(pipe,
963 						   ISS_PIPELINE_STREAM_CONTINUOUS);
964 		if (ret < 0)
965 			goto err_omap4iss_set_stream;
966 		spin_lock_irqsave(&video->qlock, flags);
967 		if (list_empty(&video->dmaqueue))
968 			video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
969 		spin_unlock_irqrestore(&video->qlock, flags);
970 	}
971 
972 	media_graph_walk_cleanup(&graph);
973 
974 	mutex_unlock(&video->stream_lock);
975 
976 	return 0;
977 
978 err_omap4iss_set_stream:
979 	vb2_streamoff(&vfh->queue, type);
980 err_iss_video_check_format:
981 	media_pipeline_stop(&video->video.entity);
982 err_media_pipeline_start:
983 	if (video->iss->pdata->set_constraints)
984 		video->iss->pdata->set_constraints(video->iss, false);
985 	video->queue = NULL;
986 
987 	media_graph_walk_cleanup(&graph);
988 
989 err_graph_walk_init:
990 	media_entity_enum_cleanup(&pipe->ent_enum);
991 
992 	mutex_unlock(&video->stream_lock);
993 
994 	return ret;
995 }
996 
997 static int
iss_video_streamoff(struct file * file,void * fh,enum v4l2_buf_type type)998 iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
999 {
1000 	struct iss_video_fh *vfh = to_iss_video_fh(fh);
1001 	struct iss_video *video = video_drvdata(file);
1002 	struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
1003 	enum iss_pipeline_state state;
1004 	unsigned long flags;
1005 
1006 	if (type != video->type)
1007 		return -EINVAL;
1008 
1009 	mutex_lock(&video->stream_lock);
1010 
1011 	if (!vb2_is_streaming(&vfh->queue))
1012 		goto done;
1013 
1014 	/* Update the pipeline state. */
1015 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1016 		state = ISS_PIPELINE_STREAM_OUTPUT
1017 		      | ISS_PIPELINE_QUEUE_OUTPUT;
1018 	else
1019 		state = ISS_PIPELINE_STREAM_INPUT
1020 		      | ISS_PIPELINE_QUEUE_INPUT;
1021 
1022 	spin_lock_irqsave(&pipe->lock, flags);
1023 	pipe->state &= ~state;
1024 	spin_unlock_irqrestore(&pipe->lock, flags);
1025 
1026 	/* Stop the stream. */
1027 	omap4iss_pipeline_set_stream(pipe, ISS_PIPELINE_STREAM_STOPPED);
1028 	vb2_streamoff(&vfh->queue, type);
1029 	video->queue = NULL;
1030 
1031 	media_entity_enum_cleanup(&pipe->ent_enum);
1032 
1033 	if (video->iss->pdata->set_constraints)
1034 		video->iss->pdata->set_constraints(video->iss, false);
1035 	media_pipeline_stop(&video->video.entity);
1036 
1037 done:
1038 	mutex_unlock(&video->stream_lock);
1039 	return 0;
1040 }
1041 
1042 static int
iss_video_enum_input(struct file * file,void * fh,struct v4l2_input * input)1043 iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
1044 {
1045 	if (input->index > 0)
1046 		return -EINVAL;
1047 
1048 	strscpy(input->name, "camera", sizeof(input->name));
1049 	input->type = V4L2_INPUT_TYPE_CAMERA;
1050 
1051 	return 0;
1052 }
1053 
1054 static int
iss_video_g_input(struct file * file,void * fh,unsigned int * input)1055 iss_video_g_input(struct file *file, void *fh, unsigned int *input)
1056 {
1057 	*input = 0;
1058 
1059 	return 0;
1060 }
1061 
1062 static int
iss_video_s_input(struct file * file,void * fh,unsigned int input)1063 iss_video_s_input(struct file *file, void *fh, unsigned int input)
1064 {
1065 	return input == 0 ? 0 : -EINVAL;
1066 }
1067 
1068 static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
1069 	.vidioc_querycap		= iss_video_querycap,
1070 	.vidioc_enum_fmt_vid_cap        = iss_video_enum_format,
1071 	.vidioc_g_fmt_vid_cap		= iss_video_get_format,
1072 	.vidioc_s_fmt_vid_cap		= iss_video_set_format,
1073 	.vidioc_try_fmt_vid_cap		= iss_video_try_format,
1074 	.vidioc_g_fmt_vid_out		= iss_video_get_format,
1075 	.vidioc_s_fmt_vid_out		= iss_video_set_format,
1076 	.vidioc_try_fmt_vid_out		= iss_video_try_format,
1077 	.vidioc_g_selection		= iss_video_get_selection,
1078 	.vidioc_s_selection		= iss_video_set_selection,
1079 	.vidioc_g_parm			= iss_video_get_param,
1080 	.vidioc_s_parm			= iss_video_set_param,
1081 	.vidioc_reqbufs			= iss_video_reqbufs,
1082 	.vidioc_querybuf		= iss_video_querybuf,
1083 	.vidioc_qbuf			= iss_video_qbuf,
1084 	.vidioc_expbuf			= iss_video_expbuf,
1085 	.vidioc_dqbuf			= iss_video_dqbuf,
1086 	.vidioc_streamon		= iss_video_streamon,
1087 	.vidioc_streamoff		= iss_video_streamoff,
1088 	.vidioc_enum_input		= iss_video_enum_input,
1089 	.vidioc_g_input			= iss_video_g_input,
1090 	.vidioc_s_input			= iss_video_s_input,
1091 };
1092 
1093 /* -----------------------------------------------------------------------------
1094  * V4L2 file operations
1095  */
1096 
iss_video_open(struct file * file)1097 static int iss_video_open(struct file *file)
1098 {
1099 	struct iss_video *video = video_drvdata(file);
1100 	struct iss_video_fh *handle;
1101 	struct vb2_queue *q;
1102 	int ret = 0;
1103 
1104 	handle = kzalloc(sizeof(*handle), GFP_KERNEL);
1105 	if (!handle)
1106 		return -ENOMEM;
1107 
1108 	v4l2_fh_init(&handle->vfh, &video->video);
1109 	v4l2_fh_add(&handle->vfh);
1110 
1111 	/* If this is the first user, initialise the pipeline. */
1112 	if (!omap4iss_get(video->iss)) {
1113 		ret = -EBUSY;
1114 		goto done;
1115 	}
1116 
1117 	ret = v4l2_pipeline_pm_get(&video->video.entity);
1118 	if (ret < 0) {
1119 		omap4iss_put(video->iss);
1120 		goto done;
1121 	}
1122 
1123 	q = &handle->queue;
1124 
1125 	q->type = video->type;
1126 	q->io_modes = VB2_MMAP | VB2_DMABUF;
1127 	q->drv_priv = handle;
1128 	q->ops = &iss_video_vb2ops;
1129 	q->mem_ops = &vb2_dma_contig_memops;
1130 	q->buf_struct_size = sizeof(struct iss_buffer);
1131 	q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1132 	q->dev = video->iss->dev;
1133 
1134 	ret = vb2_queue_init(q);
1135 	if (ret) {
1136 		omap4iss_put(video->iss);
1137 		goto done;
1138 	}
1139 
1140 	memset(&handle->format, 0, sizeof(handle->format));
1141 	handle->format.type = video->type;
1142 	handle->timeperframe.denominator = 1;
1143 
1144 	handle->video = video;
1145 	file->private_data = &handle->vfh;
1146 
1147 done:
1148 	if (ret < 0) {
1149 		v4l2_fh_del(&handle->vfh);
1150 		v4l2_fh_exit(&handle->vfh);
1151 		kfree(handle);
1152 	}
1153 
1154 	return ret;
1155 }
1156 
iss_video_release(struct file * file)1157 static int iss_video_release(struct file *file)
1158 {
1159 	struct iss_video *video = video_drvdata(file);
1160 	struct v4l2_fh *vfh = file->private_data;
1161 	struct iss_video_fh *handle = to_iss_video_fh(vfh);
1162 
1163 	/* Disable streaming and free the buffers queue resources. */
1164 	iss_video_streamoff(file, vfh, video->type);
1165 
1166 	v4l2_pipeline_pm_put(&video->video.entity);
1167 
1168 	/* Release the videobuf2 queue */
1169 	vb2_queue_release(&handle->queue);
1170 
1171 	v4l2_fh_del(vfh);
1172 	v4l2_fh_exit(vfh);
1173 	kfree(handle);
1174 	file->private_data = NULL;
1175 
1176 	omap4iss_put(video->iss);
1177 
1178 	return 0;
1179 }
1180 
iss_video_poll(struct file * file,poll_table * wait)1181 static __poll_t iss_video_poll(struct file *file, poll_table *wait)
1182 {
1183 	struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1184 
1185 	return vb2_poll(&vfh->queue, file, wait);
1186 }
1187 
iss_video_mmap(struct file * file,struct vm_area_struct * vma)1188 static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
1189 {
1190 	struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1191 
1192 	return vb2_mmap(&vfh->queue, vma);
1193 }
1194 
1195 static const struct v4l2_file_operations iss_video_fops = {
1196 	.owner = THIS_MODULE,
1197 	.unlocked_ioctl = video_ioctl2,
1198 	.open = iss_video_open,
1199 	.release = iss_video_release,
1200 	.poll = iss_video_poll,
1201 	.mmap = iss_video_mmap,
1202 };
1203 
1204 /* -----------------------------------------------------------------------------
1205  * ISS video core
1206  */
1207 
1208 static const struct iss_video_operations iss_video_dummy_ops = {
1209 };
1210 
omap4iss_video_init(struct iss_video * video,const char * name)1211 int omap4iss_video_init(struct iss_video *video, const char *name)
1212 {
1213 	const char *direction;
1214 	int ret;
1215 
1216 	switch (video->type) {
1217 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1218 		direction = "output";
1219 		video->pad.flags = MEDIA_PAD_FL_SINK;
1220 		break;
1221 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1222 		direction = "input";
1223 		video->pad.flags = MEDIA_PAD_FL_SOURCE;
1224 		break;
1225 
1226 	default:
1227 		return -EINVAL;
1228 	}
1229 
1230 	ret = media_entity_pads_init(&video->video.entity, 1, &video->pad);
1231 	if (ret < 0)
1232 		return ret;
1233 
1234 	spin_lock_init(&video->qlock);
1235 	mutex_init(&video->mutex);
1236 	atomic_set(&video->active, 0);
1237 
1238 	spin_lock_init(&video->pipe.lock);
1239 	mutex_init(&video->stream_lock);
1240 
1241 	/* Initialize the video device. */
1242 	if (!video->ops)
1243 		video->ops = &iss_video_dummy_ops;
1244 
1245 	video->video.fops = &iss_video_fops;
1246 	snprintf(video->video.name, sizeof(video->video.name),
1247 		 "OMAP4 ISS %s %s", name, direction);
1248 	video->video.vfl_type = VFL_TYPE_VIDEO;
1249 	video->video.release = video_device_release_empty;
1250 	video->video.ioctl_ops = &iss_video_ioctl_ops;
1251 	video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
1252 
1253 	video_set_drvdata(&video->video, video);
1254 
1255 	return 0;
1256 }
1257 
omap4iss_video_cleanup(struct iss_video * video)1258 void omap4iss_video_cleanup(struct iss_video *video)
1259 {
1260 	media_entity_cleanup(&video->video.entity);
1261 	mutex_destroy(&video->stream_lock);
1262 	mutex_destroy(&video->mutex);
1263 }
1264 
omap4iss_video_register(struct iss_video * video,struct v4l2_device * vdev)1265 int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
1266 {
1267 	int ret;
1268 
1269 	video->video.v4l2_dev = vdev;
1270 	if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1271 		video->video.device_caps = V4L2_CAP_VIDEO_CAPTURE;
1272 	else
1273 		video->video.device_caps = V4L2_CAP_VIDEO_OUTPUT;
1274 	video->video.device_caps |= V4L2_CAP_STREAMING;
1275 
1276 	ret = video_register_device(&video->video, VFL_TYPE_VIDEO, -1);
1277 	if (ret < 0)
1278 		dev_err(video->iss->dev,
1279 			"could not register video device (%d)\n", ret);
1280 
1281 	return ret;
1282 }
1283 
omap4iss_video_unregister(struct iss_video * video)1284 void omap4iss_video_unregister(struct iss_video *video)
1285 {
1286 	video_unregister_device(&video->video);
1287 }
1288