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[media] media: videobuf2: Change queue_setup argument
[deliverable/linux.git] / drivers / staging / media / omap4iss / iss_video.c
CommitLineData
fc96d58c
SA		 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/* -----------------------------------------------------------------------------
30 * Helper functions
31 */
32
33static struct iss_format_info formats[] = {
3336f07a
BB		 34 { MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
35 MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
a1d4eab0 36 V4L2_PIX_FMT_GREY, 8, "Greyscale 8 bpp", },
3336f07a
BB		 37 { MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
38 MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
a1d4eab0 39 V4L2_PIX_FMT_Y10, 10, "Greyscale 10 bpp", },
3336f07a
BB		 40 { MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
41 MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
a1d4eab0 42 V4L2_PIX_FMT_Y12, 12, "Greyscale 12 bpp", },
3336f07a
BB		 43 { MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
44 MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
a1d4eab0 45 V4L2_PIX_FMT_SBGGR8, 8, "BGGR Bayer 8 bpp", },
3336f07a
BB		 46 { MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
47 MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
a1d4eab0 48 V4L2_PIX_FMT_SGBRG8, 8, "GBRG Bayer 8 bpp", },
3336f07a
BB		 49 { MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
50 MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
a1d4eab0 51 V4L2_PIX_FMT_SGRBG8, 8, "GRBG Bayer 8 bpp", },
3336f07a
BB		 52 { MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
53 MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
a1d4eab0 54 V4L2_PIX_FMT_SRGGB8, 8, "RGGB Bayer 8 bpp", },
3336f07a
BB		 55 { MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
56 MEDIA_BUS_FMT_SGRBG10_1X10, 0,
a1d4eab0 57 V4L2_PIX_FMT_SGRBG10DPCM8, 8, "GRBG Bayer 10 bpp DPCM8", },
3336f07a
BB		 58 { MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
59 MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
a1d4eab0 60 V4L2_PIX_FMT_SBGGR10, 10, "BGGR Bayer 10 bpp", },
3336f07a
BB		 61 { MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
62 MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
a1d4eab0 63 V4L2_PIX_FMT_SGBRG10, 10, "GBRG Bayer 10 bpp", },
3336f07a
BB		 64 { MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
65 MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
a1d4eab0 66 V4L2_PIX_FMT_SGRBG10, 10, "GRBG Bayer 10 bpp", },
3336f07a
BB		 67 { MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
68 MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
a1d4eab0 69 V4L2_PIX_FMT_SRGGB10, 10, "RGGB Bayer 10 bpp", },
3336f07a
BB		 70 { MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
71 MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
a1d4eab0 72 V4L2_PIX_FMT_SBGGR12, 12, "BGGR Bayer 12 bpp", },
3336f07a
BB		 73 { MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
74 MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
a1d4eab0 75 V4L2_PIX_FMT_SGBRG12, 12, "GBRG Bayer 12 bpp", },
3336f07a
BB		 76 { MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
77 MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
a1d4eab0 78 V4L2_PIX_FMT_SGRBG12, 12, "GRBG Bayer 12 bpp", },
3336f07a
BB		 79 { MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
80 MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
a1d4eab0 81 V4L2_PIX_FMT_SRGGB12, 12, "RGGB Bayer 12 bpp", },
3336f07a
BB		 82 { MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
83 MEDIA_BUS_FMT_UYVY8_1X16, 0,
a1d4eab0 84 V4L2_PIX_FMT_UYVY, 16, "YUV 4:2:2 (UYVY)", },
3336f07a
BB		 85 { MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
86 MEDIA_BUS_FMT_YUYV8_1X16, 0,
a1d4eab0 87 V4L2_PIX_FMT_YUYV, 16, "YUV 4:2:2 (YUYV)", },
3336f07a
BB		 88 { MEDIA_BUS_FMT_YUYV8_1_5X8, MEDIA_BUS_FMT_YUYV8_1_5X8,
89 MEDIA_BUS_FMT_YUYV8_1_5X8, 0,
a1d4eab0 90 V4L2_PIX_FMT_NV12, 8, "YUV 4:2:0 (NV12)", },
fc96d58c
SA		 91};
92
93const struct iss_format_info *
3336f07a 94omap4iss_video_format_info(u32 code)
fc96d58c
SA		 95{
96 unsigned int i;
97
98 for (i = 0; i < ARRAY_SIZE(formats); ++i) {
99 if (formats[i].code == code)
100 return &formats[i];
101 }
102
103 return NULL;
104}
105
106/*
107 * iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
108 * @video: ISS video instance
109 * @mbus: v4l2_mbus_framefmt format (input)
110 * @pix: v4l2_pix_format format (output)
111 *
112 * Fill the output pix structure with information from the input mbus format.
113 * The bytesperline and sizeimage fields are computed from the requested bytes
114 * per line value in the pix format and information from the video instance.
115 *
116 * Return the number of padding bytes at end of line.
117 */
118static unsigned int iss_video_mbus_to_pix(const struct iss_video *video,
119 const struct v4l2_mbus_framefmt *mbus,
120 struct v4l2_pix_format *pix)
121{
122 unsigned int bpl = pix->bytesperline;
123 unsigned int min_bpl;
124 unsigned int i;
125
126 memset(pix, 0, sizeof(*pix));
127 pix->width = mbus->width;
128 pix->height = mbus->height;
129
130 /* Skip the last format in the loop so that it will be selected if no
131 * match is found.
132 */
133 for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
134 if (formats[i].code == mbus->code)
135 break;
136 }
137
138 min_bpl = pix->width * ALIGN(formats[i].bpp, 8) / 8;
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
165static 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
ac0eb480
LP		 174 /* Skip the last format in the loop so that it will be selected if no
175 * match is found.
176 */
177 for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
fc96d58c
SA		 178 if (formats[i].pixelformat == pix->pixelformat)
179 break;
180 }
181
fc96d58c
SA		 182 mbus->code = formats[i].code;
183 mbus->colorspace = pix->colorspace;
184 mbus->field = pix->field;
185}
186
187static struct v4l2_subdev *
188iss_video_remote_subdev(struct iss_video *video, u32 *pad)
189{
190 struct media_pad *remote;
191
192 remote = media_entity_remote_pad(&video->pad);
193
194 if (remote == NULL ||
195 media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
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. */
205static struct iss_video *
206iss_video_far_end(struct iss_video *video)
207{
208 struct media_entity_graph graph;
209 struct media_entity *entity = &video->video.entity;
210 struct media_device *mdev = entity->parent;
211 struct iss_video *far_end = NULL;
212
213 mutex_lock(&mdev->graph_mutex);
214 media_entity_graph_walk_start(&graph, entity);
215
216 while ((entity = media_entity_graph_walk_next(&graph))) {
217 if (entity == &video->video.entity)
218 continue;
219
220 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
221 continue;
222
223 far_end = to_iss_video(media_entity_to_video_device(entity));
224 if (far_end->type != video->type)
225 break;
226
227 far_end = NULL;
228 }
229
230 mutex_unlock(&mdev->graph_mutex);
231 return far_end;
232}
233
234static int
cc3c2ac2
LP		 235__iss_video_get_format(struct iss_video *video,
236 struct v4l2_mbus_framefmt *format)
fc96d58c
SA		 237{
238 struct v4l2_subdev_format fmt;
239 struct v4l2_subdev *subdev;
240 u32 pad;
241 int ret;
242
243 subdev = iss_video_remote_subdev(video, &pad);
244 if (subdev == NULL)
245 return -EINVAL;
246
cc3c2ac2 247 memset(&fmt, 0, sizeof(fmt));
fc96d58c
SA		 248 fmt.pad = pad;
249 fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
fc96d58c 250
c3dbc70d
LP		 251 mutex_lock(&video->mutex);
252 ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
fc96d58c
SA		 253 mutex_unlock(&video->mutex);
254
255 if (ret)
256 return ret;
257
cc3c2ac2
LP		 258 *format = fmt.format;
259 return 0;
fc96d58c
SA		 260}
261
262static int
263iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
264{
cc3c2ac2
LP		 265 struct v4l2_mbus_framefmt format;
266 struct v4l2_pix_format pixfmt;
fc96d58c
SA		 267 int ret;
268
fc96d58c
SA		 269 ret = __iss_video_get_format(video, &format);
270 if (ret < 0)
271 return ret;
272
cc3c2ac2
LP		 273 pixfmt.bytesperline = 0;
274 ret = iss_video_mbus_to_pix(video, &format, &pixfmt);
275
276 if (vfh->format.fmt.pix.pixelformat != pixfmt.pixelformat ||
277 vfh->format.fmt.pix.height != pixfmt.height ||
278 vfh->format.fmt.pix.width != pixfmt.width ||
279 vfh->format.fmt.pix.bytesperline != pixfmt.bytesperline ||
280 vfh->format.fmt.pix.sizeimage != pixfmt.sizeimage)
fc96d58c
SA		 281 return -EINVAL;
282
283 return ret;
284}
285
286/* -----------------------------------------------------------------------------
287 * Video queue operations
288 */
289
a0fe029c 290static int iss_video_queue_setup(struct vb2_queue *vq,
33119e80 291 const void *parg,
fc96d58c
SA		 292 unsigned int *count, unsigned int *num_planes,
293 unsigned int sizes[], void *alloc_ctxs[])
294{
295 struct iss_video_fh *vfh = vb2_get_drv_priv(vq);
296 struct iss_video *video = vfh->video;
297
298 /* Revisit multi-planar support for NV12 */
299 *num_planes = 1;
300
301 sizes[0] = vfh->format.fmt.pix.sizeimage;
302 if (sizes[0] == 0)
303 return -EINVAL;
304
305 alloc_ctxs[0] = video->alloc_ctx;
306
a0fe029c 307 *count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));
fc96d58c
SA		 308
309 return 0;
310}
311
312static void iss_video_buf_cleanup(struct vb2_buffer *vb)
313{
2d700715
JS		 314 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
315 struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
fc96d58c
SA		 316
317 if (buffer->iss_addr)
318 buffer->iss_addr = 0;
319}
320
321static int iss_video_buf_prepare(struct vb2_buffer *vb)
322{
2d700715 323 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
fc96d58c 324 struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
2d700715 325 struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
fc96d58c
SA		 326 struct iss_video *video = vfh->video;
327 unsigned long size = vfh->format.fmt.pix.sizeimage;
328 dma_addr_t addr;
329
330 if (vb2_plane_size(vb, 0) < size)
331 return -ENOBUFS;
332
333 addr = vb2_dma_contig_plane_dma_addr(vb, 0);
334 if (!IS_ALIGNED(addr, 32)) {
499226fb
LP		 335 dev_dbg(video->iss->dev,
336 "Buffer address must be aligned to 32 bytes boundary.\n");
fc96d58c
SA		 337 return -EINVAL;
338 }
339
340 vb2_set_plane_payload(vb, 0, size);
341 buffer->iss_addr = addr;
342 return 0;
343}
344
345static void iss_video_buf_queue(struct vb2_buffer *vb)
346{
2d700715 347 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
fc96d58c
SA		 348 struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
349 struct iss_video *video = vfh->video;
2d700715 350 struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
fc96d58c 351 struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
fc96d58c 352 unsigned long flags;
112da085 353 bool empty;
fc96d58c
SA		 354
355 spin_lock_irqsave(&video->qlock, flags);
112da085 356
cb766937
LP		 357 /* Mark the buffer is faulty and give it back to the queue immediately
358 * if the video node has registered an error. vb2 will perform the same
359 * check when preparing the buffer, but that is inherently racy, so we
360 * need to handle the race condition with an authoritative check here.
361 */
112da085
LP		 362 if (unlikely(video->error)) {
363 vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
364 spin_unlock_irqrestore(&video->qlock, flags);
365 return;
366 }
367
fc96d58c
SA		 368 empty = list_empty(&video->dmaqueue);
369 list_add_tail(&buffer->list, &video->dmaqueue);
112da085 370
fc96d58c
SA		 371 spin_unlock_irqrestore(&video->qlock, flags);
372
373 if (empty) {
374 enum iss_pipeline_state state;
375 unsigned int start;
376
377 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
378 state = ISS_PIPELINE_QUEUE_OUTPUT;
379 else
380 state = ISS_PIPELINE_QUEUE_INPUT;
381
382 spin_lock_irqsave(&pipe->lock, flags);
383 pipe->state |= state;
384 video->ops->queue(video, buffer);
385 video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
386
387 start = iss_pipeline_ready(pipe);
388 if (start)
389 pipe->state |= ISS_PIPELINE_STREAM;
390 spin_unlock_irqrestore(&pipe->lock, flags);
391
392 if (start)
393 omap4iss_pipeline_set_stream(pipe,
394 ISS_PIPELINE_STREAM_SINGLESHOT);
395 }
396}
397
fbac1400 398static const struct vb2_ops iss_video_vb2ops = {
fc96d58c
SA		 399 .queue_setup = iss_video_queue_setup,
400 .buf_prepare = iss_video_buf_prepare,
401 .buf_queue = iss_video_buf_queue,
402 .buf_cleanup = iss_video_buf_cleanup,
403};
404
405/*
406 * omap4iss_video_buffer_next - Complete the current buffer and return the next
407 * @video: ISS video object
408 *
409 * Remove the current video buffer from the DMA queue and fill its timestamp,
410 * field count and state fields before waking up its completion handler.
411 *
412 * For capture video nodes, the buffer state is set to VB2_BUF_STATE_DONE if no
413 * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
414 *
415 * The DMA queue is expected to contain at least one buffer.
416 *
417 * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
418 * empty.
419 */
420struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
421{
422 struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
423 enum iss_pipeline_state state;
424 struct iss_buffer *buf;
425 unsigned long flags;
fc96d58c
SA		 426
427 spin_lock_irqsave(&video->qlock, flags);
428 if (WARN_ON(list_empty(&video->dmaqueue))) {
429 spin_unlock_irqrestore(&video->qlock, flags);
430 return NULL;
431 }
432
433 buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
434 list);
435 list_del(&buf->list);
436 spin_unlock_irqrestore(&video->qlock, flags);
437
2d700715 438 v4l2_get_timestamp(&buf->vb.timestamp);
fc96d58c
SA		 439
440 /* Do frame number propagation only if this is the output video node.
441 * Frame number either comes from the CSI receivers or it gets
442 * incremented here if H3A is not active.
443 * Note: There is no guarantee that the output buffer will finish
444 * first, so the input number might lag behind by 1 in some cases.
445 */
446 if (video == pipe->output && !pipe->do_propagation)
2d700715 447 buf->vb.sequence =
a0fe029c 448 atomic_inc_return(&pipe->frame_number);
fc96d58c 449 else
2d700715 450 buf->vb.sequence = atomic_read(&pipe->frame_number);
fc96d58c 451
2d700715 452 vb2_buffer_done(&buf->vb.vb2_buf, pipe->error ?
a0fe029c 453 VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
fc96d58c
SA		 454 pipe->error = false;
455
456 spin_lock_irqsave(&video->qlock, flags);
457 if (list_empty(&video->dmaqueue)) {
458 spin_unlock_irqrestore(&video->qlock, flags);
459 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
460 state = ISS_PIPELINE_QUEUE_OUTPUT
461 | ISS_PIPELINE_STREAM;
462 else
463 state = ISS_PIPELINE_QUEUE_INPUT
464 | ISS_PIPELINE_STREAM;
465
466 spin_lock_irqsave(&pipe->lock, flags);
467 pipe->state &= ~state;
468 if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
469 video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
470 spin_unlock_irqrestore(&pipe->lock, flags);
471 return NULL;
472 }
473
474 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
f7d40eea 475 spin_lock(&pipe->lock);
fc96d58c 476 pipe->state &= ~ISS_PIPELINE_STREAM;
f7d40eea 477 spin_unlock(&pipe->lock);
fc96d58c
SA		 478 }
479
480 buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
481 list);
482 spin_unlock_irqrestore(&video->qlock, flags);
2d700715 483 buf->vb.vb2_buf.state = VB2_BUF_STATE_ACTIVE;
fc96d58c
SA		 484 return buf;
485}
486
112da085
LP		 487/*
488 * omap4iss_video_cancel_stream - Cancel stream on a video node
489 * @video: ISS video object
490 *
491 * Cancelling a stream mark all buffers on the video node as erroneous and makes
492 * sure no new buffer can be queued.
493 */
494void omap4iss_video_cancel_stream(struct iss_video *video)
495{
496 unsigned long flags;
497
498 spin_lock_irqsave(&video->qlock, flags);
499
500 while (!list_empty(&video->dmaqueue)) {
501 struct iss_buffer *buf;
502
503 buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
504 list);
505 list_del(&buf->list);
2d700715 506 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
112da085
LP		 507 }
508
cb766937 509 vb2_queue_error(video->queue);
112da085
LP		 510 video->error = true;
511
512 spin_unlock_irqrestore(&video->qlock, flags);
513}
514
fc96d58c
SA		 515/* -----------------------------------------------------------------------------
516 * V4L2 ioctls
517 */
518
519static int
520iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
521{
522 struct iss_video *video = video_drvdata(file);
523
524 strlcpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
525 strlcpy(cap->card, video->video.name, sizeof(cap->card));
526 strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));
527
528 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
35c71be8 529 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
fc96d58c 530 else
35c71be8
LP		 531 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
532
533 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
534 | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT;
fc96d58c
SA		 535
536 return 0;
537}
538
0b1d4249
LP		 539static int
540iss_video_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
541{
542 struct iss_video *video = video_drvdata(file);
543 struct v4l2_mbus_framefmt format;
544 unsigned int index = f->index;
545 unsigned int i;
546 int ret;
547
548 if (f->type != video->type)
549 return -EINVAL;
550
551 ret = __iss_video_get_format(video, &format);
552 if (ret < 0)
553 return ret;
554
555 for (i = 0; i < ARRAY_SIZE(formats); ++i) {
556 const struct iss_format_info *info = &formats[i];
557
558 if (format.code != info->code)
559 continue;
560
561 if (index == 0) {
562 f->pixelformat = info->pixelformat;
563 strlcpy(f->description, info->description,
564 sizeof(f->description));
565 return 0;
566 }
567
568 index--;
569 }
570
571 return -EINVAL;
572}
573
fc96d58c
SA		 574static int
575iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
576{
577 struct iss_video_fh *vfh = to_iss_video_fh(fh);
578 struct iss_video *video = video_drvdata(file);
579
580 if (format->type != video->type)
581 return -EINVAL;
582
583 mutex_lock(&video->mutex);
584 *format = vfh->format;
585 mutex_unlock(&video->mutex);
586
587 return 0;
588}
589
590static int
591iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
592{
593 struct iss_video_fh *vfh = to_iss_video_fh(fh);
594 struct iss_video *video = video_drvdata(file);
595 struct v4l2_mbus_framefmt fmt;
596
597 if (format->type != video->type)
598 return -EINVAL;
599
600 mutex_lock(&video->mutex);
601
602 /* Fill the bytesperline and sizeimage fields by converting to media bus
603 * format and back to pixel format.
604 */
605 iss_video_pix_to_mbus(&format->fmt.pix, &fmt);
606 iss_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
607
608 vfh->format = *format;
609
610 mutex_unlock(&video->mutex);
611 return 0;
612}
613
614static int
615iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
616{
617 struct iss_video *video = video_drvdata(file);
618 struct v4l2_subdev_format fmt;
619 struct v4l2_subdev *subdev;
620 u32 pad;
621 int ret;
622
623 if (format->type != video->type)
624 return -EINVAL;
625
626 subdev = iss_video_remote_subdev(video, &pad);
627 if (subdev == NULL)
628 return -EINVAL;
629
630 iss_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
631
632 fmt.pad = pad;
633 fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
634 ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
635 if (ret)
e43484e4 636 return ret;
fc96d58c
SA		 637
638 iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
639 return 0;
640}
641
fc96d58c
SA		 642static int
643iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
644{
645 struct iss_video_fh *vfh = to_iss_video_fh(fh);
646 struct iss_video *video = video_drvdata(file);
647
648 if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
649 video->type != a->type)
650 return -EINVAL;
651
652 memset(a, 0, sizeof(*a));
653 a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
654 a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
655 a->parm.output.timeperframe = vfh->timeperframe;
656
657 return 0;
658}
659
660static int
661iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
662{
663 struct iss_video_fh *vfh = to_iss_video_fh(fh);
664 struct iss_video *video = video_drvdata(file);
665
666 if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
667 video->type != a->type)
668 return -EINVAL;
669
670 if (a->parm.output.timeperframe.denominator == 0)
671 a->parm.output.timeperframe.denominator = 1;
672
673 vfh->timeperframe = a->parm.output.timeperframe;
674
675 return 0;
676}
677
678static int
679iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
680{
681 struct iss_video_fh *vfh = to_iss_video_fh(fh);
682
683 return vb2_reqbufs(&vfh->queue, rb);
684}
685
686static int
687iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
688{
689 struct iss_video_fh *vfh = to_iss_video_fh(fh);
690
691 return vb2_querybuf(&vfh->queue, b);
692}
693
694static int
695iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
696{
697 struct iss_video_fh *vfh = to_iss_video_fh(fh);
698
699 return vb2_qbuf(&vfh->queue, b);
700}
701
3e90f789
LP		 702static int
703iss_video_expbuf(struct file *file, void *fh, struct v4l2_exportbuffer *e)
704{
705 struct iss_video_fh *vfh = to_iss_video_fh(fh);
706
707 return vb2_expbuf(&vfh->queue, e);
708}
709
fc96d58c
SA		 710static int
711iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
712{
713 struct iss_video_fh *vfh = to_iss_video_fh(fh);
714
715 return vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
716}
717
718/*
719 * Stream management
720 *
721 * Every ISS pipeline has a single input and a single output. The input can be
722 * either a sensor or a video node. The output is always a video node.
723 *
724 * As every pipeline has an output video node, the ISS video objects at the
725 * pipeline output stores the pipeline state. It tracks the streaming state of
726 * both the input and output, as well as the availability of buffers.
727 *
728 * In sensor-to-memory mode, frames are always available at the pipeline input.
729 * Starting the sensor usually requires I2C transfers and must be done in
730 * interruptible context. The pipeline is started and stopped synchronously
731 * to the stream on/off commands. All modules in the pipeline will get their
732 * subdev set stream handler called. The module at the end of the pipeline must
733 * delay starting the hardware until buffers are available at its output.
734 *
735 * In memory-to-memory mode, starting/stopping the stream requires
736 * synchronization between the input and output. ISS modules can't be stopped
737 * in the middle of a frame, and at least some of the modules seem to become
738 * busy as soon as they're started, even if they don't receive a frame start
739 * event. For that reason frames need to be processed in single-shot mode. The
740 * driver needs to wait until a frame is completely processed and written to
741 * memory before restarting the pipeline for the next frame. Pipelined
742 * processing might be possible but requires more testing.
743 *
744 * Stream start must be delayed until buffers are available at both the input
745 * and output. The pipeline must be started in the videobuf queue callback with
746 * the buffers queue spinlock held. The modules subdev set stream operation must
747 * not sleep.
748 */
749static int
750iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
751{
752 struct iss_video_fh *vfh = to_iss_video_fh(fh);
753 struct iss_video *video = video_drvdata(file);
f3632ba8
LP		 754 struct media_entity_graph graph;
755 struct media_entity *entity;
fc96d58c
SA		 756 enum iss_pipeline_state state;
757 struct iss_pipeline *pipe;
758 struct iss_video *far_end;
759 unsigned long flags;
760 int ret;
761
762 if (type != video->type)
763 return -EINVAL;
764
765 mutex_lock(&video->stream_lock);
766
fc96d58c
SA		 767 /* Start streaming on the pipeline. No link touching an entity in the
768 * pipeline can be activated or deactivated once streaming is started.
769 */
770 pipe = video->video.entity.pipe
771 ? to_iss_pipeline(&video->video.entity) : &video->pipe;
772 pipe->external = NULL;
773 pipe->external_rate = 0;
774 pipe->external_bpp = 0;
f3632ba8 775 pipe->entities = 0;
fc96d58c
SA		 776
777 if (video->iss->pdata->set_constraints)
778 video->iss->pdata->set_constraints(video->iss, true);
779
780 ret = media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
781 if (ret < 0)
782 goto err_media_entity_pipeline_start;
783
f3632ba8
LP		 784 entity = &video->video.entity;
785 media_entity_graph_walk_start(&graph, entity);
786 while ((entity = media_entity_graph_walk_next(&graph)))
787 pipe->entities |= 1 << entity->id;
788
fc96d58c
SA		 789 /* Verify that the currently configured format matches the output of
790 * the connected subdev.
791 */
792 ret = iss_video_check_format(video, vfh);
793 if (ret < 0)
794 goto err_iss_video_check_format;
795
796 video->bpl_padding = ret;
797 video->bpl_value = vfh->format.fmt.pix.bytesperline;
798
799 /* Find the ISS video node connected at the far end of the pipeline and
800 * update the pipeline.
801 */
802 far_end = iss_video_far_end(video);
803
804 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
805 state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
806 pipe->input = far_end;
807 pipe->output = video;
808 } else {
809 if (far_end == NULL) {
810 ret = -EPIPE;
811 goto err_iss_video_check_format;
812 }
813
814 state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
815 pipe->input = video;
816 pipe->output = far_end;
817 }
818
819 spin_lock_irqsave(&pipe->lock, flags);
820 pipe->state &= ~ISS_PIPELINE_STREAM;
821 pipe->state |= state;
822 spin_unlock_irqrestore(&pipe->lock, flags);
823
824 /* Set the maximum time per frame as the value requested by userspace.
825 * This is a soft limit that can be overridden if the hardware doesn't
826 * support the request limit.
827 */
828 if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
829 pipe->max_timeperframe = vfh->timeperframe;
830
831 video->queue = &vfh->queue;
832 INIT_LIST_HEAD(&video->dmaqueue);
112da085 833 video->error = false;
fc96d58c
SA		 834 atomic_set(&pipe->frame_number, -1);
835
836 ret = vb2_streamon(&vfh->queue, type);
837 if (ret < 0)
838 goto err_iss_video_check_format;
839
840 /* In sensor-to-memory mode, the stream can be started synchronously
841 * to the stream on command. In memory-to-memory mode, it will be
842 * started when buffers are queued on both the input and output.
843 */
844 if (pipe->input == NULL) {
845 unsigned long flags;
00ef07e3 846
fc96d58c
SA		 847 ret = omap4iss_pipeline_set_stream(pipe,
848 ISS_PIPELINE_STREAM_CONTINUOUS);
849 if (ret < 0)
850 goto err_omap4iss_set_stream;
851 spin_lock_irqsave(&video->qlock, flags);
852 if (list_empty(&video->dmaqueue))
853 video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
854 spin_unlock_irqrestore(&video->qlock, flags);
855 }
856
2b16b44a
LP		 857 mutex_unlock(&video->stream_lock);
858 return 0;
859
fc96d58c 860err_omap4iss_set_stream:
2b16b44a 861 vb2_streamoff(&vfh->queue, type);
fc96d58c 862err_iss_video_check_format:
2b16b44a 863 media_entity_pipeline_stop(&video->video.entity);
fc96d58c 864err_media_entity_pipeline_start:
2b16b44a
LP		 865 if (video->iss->pdata->set_constraints)
866 video->iss->pdata->set_constraints(video->iss, false);
867 video->queue = NULL;
fc96d58c 868
fc96d58c
SA		 869 mutex_unlock(&video->stream_lock);
870 return ret;
871}
872
873static int
874iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
875{
876 struct iss_video_fh *vfh = to_iss_video_fh(fh);
877 struct iss_video *video = video_drvdata(file);
878 struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
879 enum iss_pipeline_state state;
880 unsigned long flags;
881
882 if (type != video->type)
883 return -EINVAL;
884
885 mutex_lock(&video->stream_lock);
886
887 if (!vb2_is_streaming(&vfh->queue))
888 goto done;
889
890 /* Update the pipeline state. */
891 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
892 state = ISS_PIPELINE_STREAM_OUTPUT
893 | ISS_PIPELINE_QUEUE_OUTPUT;
894 else
895 state = ISS_PIPELINE_STREAM_INPUT
896 | ISS_PIPELINE_QUEUE_INPUT;
897
898 spin_lock_irqsave(&pipe->lock, flags);
899 pipe->state &= ~state;
900 spin_unlock_irqrestore(&pipe->lock, flags);
901
902 /* Stop the stream. */
903 omap4iss_pipeline_set_stream(pipe, ISS_PIPELINE_STREAM_STOPPED);
904 vb2_streamoff(&vfh->queue, type);
905 video->queue = NULL;
fc96d58c
SA		 906
907 if (video->iss->pdata->set_constraints)
908 video->iss->pdata->set_constraints(video->iss, false);
909 media_entity_pipeline_stop(&video->video.entity);
910
911done:
912 mutex_unlock(&video->stream_lock);
913 return 0;
914}
915
916static int
917iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
918{
919 if (input->index > 0)
920 return -EINVAL;
921
922 strlcpy(input->name, "camera", sizeof(input->name));
923 input->type = V4L2_INPUT_TYPE_CAMERA;
924
925 return 0;
926}
927
928static int
929iss_video_g_input(struct file *file, void *fh, unsigned int *input)
930{
931 *input = 0;
932
933 return 0;
934}
935
16422f55
LP		 936static int
937iss_video_s_input(struct file *file, void *fh, unsigned int input)
938{
939 return input == 0 ? 0 : -EINVAL;
940}
941
fc96d58c
SA		 942static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
943 .vidioc_querycap = iss_video_querycap,
0b1d4249 944 .vidioc_enum_fmt_vid_cap = iss_video_enum_format,
fc96d58c
SA		 945 .vidioc_g_fmt_vid_cap = iss_video_get_format,
946 .vidioc_s_fmt_vid_cap = iss_video_set_format,
947 .vidioc_try_fmt_vid_cap = iss_video_try_format,
948 .vidioc_g_fmt_vid_out = iss_video_get_format,
949 .vidioc_s_fmt_vid_out = iss_video_set_format,
950 .vidioc_try_fmt_vid_out = iss_video_try_format,
fc96d58c
SA		 951 .vidioc_g_parm = iss_video_get_param,
952 .vidioc_s_parm = iss_video_set_param,
953 .vidioc_reqbufs = iss_video_reqbufs,
954 .vidioc_querybuf = iss_video_querybuf,
955 .vidioc_qbuf = iss_video_qbuf,
3e90f789 956 .vidioc_expbuf = iss_video_expbuf,
fc96d58c
SA		 957 .vidioc_dqbuf = iss_video_dqbuf,
958 .vidioc_streamon = iss_video_streamon,
959 .vidioc_streamoff = iss_video_streamoff,
960 .vidioc_enum_input = iss_video_enum_input,
961 .vidioc_g_input = iss_video_g_input,
16422f55 962 .vidioc_s_input = iss_video_s_input,
fc96d58c
SA		 963};
964
965/* -----------------------------------------------------------------------------
966 * V4L2 file operations
967 */
968
969static int iss_video_open(struct file *file)
970{
971 struct iss_video *video = video_drvdata(file);
972 struct iss_video_fh *handle;
973 struct vb2_queue *q;
974 int ret = 0;
975
976 handle = kzalloc(sizeof(*handle), GFP_KERNEL);
977 if (handle == NULL)
978 return -ENOMEM;
979
980 v4l2_fh_init(&handle->vfh, &video->video);
981 v4l2_fh_add(&handle->vfh);
982
983 /* If this is the first user, initialise the pipeline. */
984 if (omap4iss_get(video->iss) == NULL) {
985 ret = -EBUSY;
986 goto done;
987 }
988
989 ret = omap4iss_pipeline_pm_use(&video->video.entity, 1);
990 if (ret < 0) {
991 omap4iss_put(video->iss);
992 goto done;
993 }
994
995 video->alloc_ctx = vb2_dma_contig_init_ctx(video->iss->dev);
996 if (IS_ERR(video->alloc_ctx)) {
997 ret = PTR_ERR(video->alloc_ctx);
998 omap4iss_put(video->iss);
999 goto done;
1000 }
1001
1002 q = &handle->queue;
1003
1004 q->type = video->type;
3e90f789 1005 q->io_modes = VB2_MMAP | VB2_DMABUF;
fc96d58c
SA		 1006 q->drv_priv = handle;
1007 q->ops = &iss_video_vb2ops;
1008 q->mem_ops = &vb2_dma_contig_memops;
1009 q->buf_struct_size = sizeof(struct iss_buffer);
ade48681 1010 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
fc96d58c
SA		 1011
1012 ret = vb2_queue_init(q);
1013 if (ret) {
1014 omap4iss_put(video->iss);
1015 goto done;
1016 }
1017
1018 memset(&handle->format, 0, sizeof(handle->format));
1019 handle->format.type = video->type;
1020 handle->timeperframe.denominator = 1;
1021
1022 handle->video = video;
1023 file->private_data = &handle->vfh;
1024
1025done:
1026 if (ret < 0) {
1027 v4l2_fh_del(&handle->vfh);
1028 kfree(handle);
1029 }
1030
1031 return ret;
1032}
1033
1034static int iss_video_release(struct file *file)
1035{
1036 struct iss_video *video = video_drvdata(file);
1037 struct v4l2_fh *vfh = file->private_data;
1038 struct iss_video_fh *handle = to_iss_video_fh(vfh);
1039
1040 /* Disable streaming and free the buffers queue resources. */
1041 iss_video_streamoff(file, vfh, video->type);
1042
1043 omap4iss_pipeline_pm_use(&video->video.entity, 0);
1044
1045 /* Release the videobuf2 queue */
1046 vb2_queue_release(&handle->queue);
1047
1048 /* Release the file handle. */
1049 v4l2_fh_del(vfh);
1050 kfree(handle);
1051 file->private_data = NULL;
1052
1053 omap4iss_put(video->iss);
1054
1055 return 0;
1056}
1057
1058static unsigned int iss_video_poll(struct file *file, poll_table *wait)
1059{
1060 struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1061
1062 return vb2_poll(&vfh->queue, file, wait);
1063}
1064
1065static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
1066{
1067 struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1068
29ee6261 1069 return vb2_mmap(&vfh->queue, vma);
fc96d58c
SA		 1070}
1071
1072static struct v4l2_file_operations iss_video_fops = {
1073 .owner = THIS_MODULE,
1074 .unlocked_ioctl = video_ioctl2,
1075 .open = iss_video_open,
1076 .release = iss_video_release,
1077 .poll = iss_video_poll,
1078 .mmap = iss_video_mmap,
1079};
1080
1081/* -----------------------------------------------------------------------------
1082 * ISS video core
1083 */
1084
1085static const struct iss_video_operations iss_video_dummy_ops = {
1086};
1087
1088int omap4iss_video_init(struct iss_video *video, const char *name)
1089{
1090 const char *direction;
1091 int ret;
1092
1093 switch (video->type) {
1094 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1095 direction = "output";
1096 video->pad.flags = MEDIA_PAD_FL_SINK;
1097 break;
1098 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1099 direction = "input";
1100 video->pad.flags = MEDIA_PAD_FL_SOURCE;
1101 break;
1102
1103 default:
1104 return -EINVAL;
1105 }
1106
1107 ret = media_entity_init(&video->video.entity, 1, &video->pad, 0);
1108 if (ret < 0)
1109 return ret;
1110
2b44ac9e 1111 spin_lock_init(&video->qlock);
fc96d58c
SA		 1112 mutex_init(&video->mutex);
1113 atomic_set(&video->active, 0);
1114
1115 spin_lock_init(&video->pipe.lock);
1116 mutex_init(&video->stream_lock);
1117
1118 /* Initialize the video device. */
1119 if (video->ops == NULL)
1120 video->ops = &iss_video_dummy_ops;
1121
1122 video->video.fops = &iss_video_fops;
1123 snprintf(video->video.name, sizeof(video->video.name),
1124 "OMAP4 ISS %s %s", name, direction);
1125 video->video.vfl_type = VFL_TYPE_GRABBER;
1126 video->video.release = video_device_release_empty;
1127 video->video.ioctl_ops = &iss_video_ioctl_ops;
1128 video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
1129
1130 video_set_drvdata(&video->video, video);
1131
1132 return 0;
1133}
1134
1135void omap4iss_video_cleanup(struct iss_video *video)
1136{
1137 media_entity_cleanup(&video->video.entity);
1138 mutex_destroy(&video->stream_lock);
1139 mutex_destroy(&video->mutex);
1140}
1141
1142int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
1143{
1144 int ret;
1145
1146 video->video.v4l2_dev = vdev;
1147
1148 ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1149 if (ret < 0)
4cd89e91 1150 dev_err(video->iss->dev,
8c6ccbeb 1151 "could not register video device (%d)\n", ret);
fc96d58c
SA		 1152
1153 return ret;
1154}
1155
1156void omap4iss_video_unregister(struct iss_video *video)
1157{
2b7f0b64 1158 video_unregister_device(&video->video);
fc96d58c 1159}
Linux kernel - Deliverables
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