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