1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * vsp1_histo.c -- R-Car VSP1 Histogram API
4 *
5 * Copyright (C) 2016 Renesas Electronics Corporation
6 * Copyright (C) 2016 Laurent Pinchart
7 *
8 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
9 */
10
11 #include <linux/device.h>
12 #include <linux/gfp.h>
13
14 #include <media/v4l2-ioctl.h>
15 #include <media/v4l2-subdev.h>
16 #include <media/videobuf2-vmalloc.h>
17
18 #include "vsp1.h"
19 #include "vsp1_histo.h"
20 #include "vsp1_pipe.h"
21
22 #define HISTO_MIN_SIZE 4U
23 #define HISTO_MAX_SIZE 8192U
24
25 /* -----------------------------------------------------------------------------
26 * Buffer Operations
27 */
28
29 static inline struct vsp1_histogram_buffer *
to_vsp1_histogram_buffer(struct vb2_v4l2_buffer * vbuf)30 to_vsp1_histogram_buffer(struct vb2_v4l2_buffer *vbuf)
31 {
32 return container_of(vbuf, struct vsp1_histogram_buffer, buf);
33 }
34
35 struct vsp1_histogram_buffer *
vsp1_histogram_buffer_get(struct vsp1_histogram * histo)36 vsp1_histogram_buffer_get(struct vsp1_histogram *histo)
37 {
38 struct vsp1_histogram_buffer *buf = NULL;
39
40 spin_lock(&histo->irqlock);
41
42 if (list_empty(&histo->irqqueue))
43 goto done;
44
45 buf = list_first_entry(&histo->irqqueue, struct vsp1_histogram_buffer,
46 queue);
47 list_del(&buf->queue);
48 histo->readout = true;
49
50 done:
51 spin_unlock(&histo->irqlock);
52 return buf;
53 }
54
vsp1_histogram_buffer_complete(struct vsp1_histogram * histo,struct vsp1_histogram_buffer * buf,size_t size)55 void vsp1_histogram_buffer_complete(struct vsp1_histogram *histo,
56 struct vsp1_histogram_buffer *buf,
57 size_t size)
58 {
59 struct vsp1_pipeline *pipe = histo->entity.pipe;
60
61 /*
62 * The pipeline pointer is guaranteed to be valid as this function is
63 * called from the frame completion interrupt handler, which can only
64 * occur when video streaming is active.
65 */
66 buf->buf.sequence = pipe->sequence;
67 buf->buf.vb2_buf.timestamp = ktime_get_ns();
68 vb2_set_plane_payload(&buf->buf.vb2_buf, 0, size);
69 vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE);
70
71 spin_lock(&histo->irqlock);
72 histo->readout = false;
73 wake_up(&histo->wait_queue);
74 spin_unlock(&histo->irqlock);
75 }
76
77 /* -----------------------------------------------------------------------------
78 * videobuf2 Queue Operations
79 */
80
histo_queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])81 static int histo_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
82 unsigned int *nplanes, unsigned int sizes[],
83 struct device *alloc_devs[])
84 {
85 struct vsp1_histogram *histo = vb2_get_drv_priv(vq);
86
87 if (*nplanes) {
88 if (*nplanes != 1)
89 return -EINVAL;
90
91 if (sizes[0] < histo->data_size)
92 return -EINVAL;
93
94 return 0;
95 }
96
97 *nplanes = 1;
98 sizes[0] = histo->data_size;
99
100 return 0;
101 }
102
histo_buffer_prepare(struct vb2_buffer * vb)103 static int histo_buffer_prepare(struct vb2_buffer *vb)
104 {
105 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
106 struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue);
107 struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf);
108
109 if (vb->num_planes != 1)
110 return -EINVAL;
111
112 if (vb2_plane_size(vb, 0) < histo->data_size)
113 return -EINVAL;
114
115 buf->addr = vb2_plane_vaddr(vb, 0);
116
117 return 0;
118 }
119
histo_buffer_queue(struct vb2_buffer * vb)120 static void histo_buffer_queue(struct vb2_buffer *vb)
121 {
122 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
123 struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue);
124 struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf);
125
126 spin_lock_irq(&histo->irqlock);
127 list_add_tail(&buf->queue, &histo->irqqueue);
128 spin_unlock_irq(&histo->irqlock);
129 }
130
histo_start_streaming(struct vb2_queue * vq,unsigned int count)131 static int histo_start_streaming(struct vb2_queue *vq, unsigned int count)
132 {
133 return 0;
134 }
135
histo_stop_streaming(struct vb2_queue * vq)136 static void histo_stop_streaming(struct vb2_queue *vq)
137 {
138 struct vsp1_histogram *histo = vb2_get_drv_priv(vq);
139 struct vsp1_histogram_buffer *buffer;
140
141 spin_lock_irq(&histo->irqlock);
142
143 /* Remove all buffers from the IRQ queue. */
144 list_for_each_entry(buffer, &histo->irqqueue, queue)
145 vb2_buffer_done(&buffer->buf.vb2_buf, VB2_BUF_STATE_ERROR);
146 INIT_LIST_HEAD(&histo->irqqueue);
147
148 /* Wait for the buffer being read out (if any) to complete. */
149 wait_event_lock_irq(histo->wait_queue, !histo->readout, histo->irqlock);
150
151 spin_unlock_irq(&histo->irqlock);
152 }
153
154 static const struct vb2_ops histo_video_queue_qops = {
155 .queue_setup = histo_queue_setup,
156 .buf_prepare = histo_buffer_prepare,
157 .buf_queue = histo_buffer_queue,
158 .wait_prepare = vb2_ops_wait_prepare,
159 .wait_finish = vb2_ops_wait_finish,
160 .start_streaming = histo_start_streaming,
161 .stop_streaming = histo_stop_streaming,
162 };
163
164 /* -----------------------------------------------------------------------------
165 * V4L2 Subdevice Operations
166 */
167
histo_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)168 static int histo_enum_mbus_code(struct v4l2_subdev *subdev,
169 struct v4l2_subdev_state *sd_state,
170 struct v4l2_subdev_mbus_code_enum *code)
171 {
172 struct vsp1_histogram *histo = subdev_to_histo(subdev);
173
174 if (code->pad == HISTO_PAD_SOURCE) {
175 code->code = MEDIA_BUS_FMT_FIXED;
176 return 0;
177 }
178
179 return vsp1_subdev_enum_mbus_code(subdev, sd_state, code,
180 histo->formats,
181 histo->num_formats);
182 }
183
histo_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_size_enum * fse)184 static int histo_enum_frame_size(struct v4l2_subdev *subdev,
185 struct v4l2_subdev_state *sd_state,
186 struct v4l2_subdev_frame_size_enum *fse)
187 {
188 if (fse->pad != HISTO_PAD_SINK)
189 return -EINVAL;
190
191 return vsp1_subdev_enum_frame_size(subdev, sd_state, fse,
192 HISTO_MIN_SIZE,
193 HISTO_MIN_SIZE, HISTO_MAX_SIZE,
194 HISTO_MAX_SIZE);
195 }
196
histo_get_selection(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_selection * sel)197 static int histo_get_selection(struct v4l2_subdev *subdev,
198 struct v4l2_subdev_state *sd_state,
199 struct v4l2_subdev_selection *sel)
200 {
201 struct vsp1_histogram *histo = subdev_to_histo(subdev);
202 struct v4l2_subdev_state *state;
203 struct v4l2_mbus_framefmt *format;
204 struct v4l2_rect *crop;
205 int ret = 0;
206
207 if (sel->pad != HISTO_PAD_SINK)
208 return -EINVAL;
209
210 mutex_lock(&histo->entity.lock);
211
212 state = vsp1_entity_get_state(&histo->entity, sd_state, sel->which);
213 if (!state) {
214 ret = -EINVAL;
215 goto done;
216 }
217
218 switch (sel->target) {
219 case V4L2_SEL_TGT_COMPOSE_BOUNDS:
220 case V4L2_SEL_TGT_COMPOSE_DEFAULT:
221 crop = v4l2_subdev_state_get_crop(state, HISTO_PAD_SINK);
222 sel->r.left = 0;
223 sel->r.top = 0;
224 sel->r.width = crop->width;
225 sel->r.height = crop->height;
226 break;
227
228 case V4L2_SEL_TGT_CROP_BOUNDS:
229 case V4L2_SEL_TGT_CROP_DEFAULT:
230 format = v4l2_subdev_state_get_format(state, HISTO_PAD_SINK);
231 sel->r.left = 0;
232 sel->r.top = 0;
233 sel->r.width = format->width;
234 sel->r.height = format->height;
235 break;
236
237 case V4L2_SEL_TGT_COMPOSE:
238 sel->r = *v4l2_subdev_state_get_compose(state, sel->pad);
239 break;
240
241 case V4L2_SEL_TGT_CROP:
242 sel->r = *v4l2_subdev_state_get_crop(state, sel->pad);
243 break;
244
245 default:
246 ret = -EINVAL;
247 break;
248 }
249
250 done:
251 mutex_unlock(&histo->entity.lock);
252 return ret;
253 }
254
histo_set_crop(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_selection * sel)255 static int histo_set_crop(struct v4l2_subdev *subdev,
256 struct v4l2_subdev_state *sd_state,
257 struct v4l2_subdev_selection *sel)
258 {
259 struct v4l2_mbus_framefmt *format;
260
261 /* The crop rectangle must be inside the input frame. */
262 format = v4l2_subdev_state_get_format(sd_state, HISTO_PAD_SINK);
263 sel->r.left = clamp_t(unsigned int, sel->r.left, 0, format->width - 1);
264 sel->r.top = clamp_t(unsigned int, sel->r.top, 0, format->height - 1);
265 sel->r.width = clamp_t(unsigned int, sel->r.width, HISTO_MIN_SIZE,
266 format->width - sel->r.left);
267 sel->r.height = clamp_t(unsigned int, sel->r.height, HISTO_MIN_SIZE,
268 format->height - sel->r.top);
269
270 /* Set the crop rectangle and reset the compose rectangle. */
271 *v4l2_subdev_state_get_crop(sd_state, sel->pad) = sel->r;
272 *v4l2_subdev_state_get_compose(sd_state, sel->pad) = sel->r;
273
274 return 0;
275 }
276
histo_set_compose(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_selection * sel)277 static int histo_set_compose(struct v4l2_subdev *subdev,
278 struct v4l2_subdev_state *sd_state,
279 struct v4l2_subdev_selection *sel)
280 {
281 struct v4l2_rect *compose;
282 struct v4l2_rect *crop;
283 unsigned int ratio;
284
285 /*
286 * The compose rectangle is used to configure downscaling, the top left
287 * corner is fixed to (0,0) and the size to 1/2 or 1/4 of the crop
288 * rectangle.
289 */
290 sel->r.left = 0;
291 sel->r.top = 0;
292
293 crop = v4l2_subdev_state_get_crop(sd_state, sel->pad);
294
295 /*
296 * Clamp the width and height to acceptable values first and then
297 * compute the closest rounded dividing ratio.
298 *
299 * Ratio Rounded ratio
300 * --------------------------
301 * [1.0 1.5[ 1
302 * [1.5 3.0[ 2
303 * [3.0 4.0] 4
304 *
305 * The rounded ratio can be computed using
306 *
307 * 1 << (ceil(ratio * 2) / 3)
308 */
309 sel->r.width = clamp(sel->r.width, crop->width / 4, crop->width);
310 ratio = 1 << (crop->width * 2 / sel->r.width / 3);
311 sel->r.width = crop->width / ratio;
312
313
314 sel->r.height = clamp(sel->r.height, crop->height / 4, crop->height);
315 ratio = 1 << (crop->height * 2 / sel->r.height / 3);
316 sel->r.height = crop->height / ratio;
317
318 compose = v4l2_subdev_state_get_compose(sd_state, sel->pad);
319 *compose = sel->r;
320
321 return 0;
322 }
323
histo_set_selection(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_selection * sel)324 static int histo_set_selection(struct v4l2_subdev *subdev,
325 struct v4l2_subdev_state *sd_state,
326 struct v4l2_subdev_selection *sel)
327 {
328 struct vsp1_histogram *histo = subdev_to_histo(subdev);
329 struct v4l2_subdev_state *state;
330 int ret;
331
332 if (sel->pad != HISTO_PAD_SINK)
333 return -EINVAL;
334
335 mutex_lock(&histo->entity.lock);
336
337 state = vsp1_entity_get_state(&histo->entity, sd_state, sel->which);
338 if (!state) {
339 ret = -EINVAL;
340 goto done;
341 }
342
343 if (sel->target == V4L2_SEL_TGT_CROP)
344 ret = histo_set_crop(subdev, state, sel);
345 else if (sel->target == V4L2_SEL_TGT_COMPOSE)
346 ret = histo_set_compose(subdev, state, sel);
347 else
348 ret = -EINVAL;
349
350 done:
351 mutex_unlock(&histo->entity.lock);
352 return ret;
353 }
354
histo_set_format(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * fmt)355 static int histo_set_format(struct v4l2_subdev *subdev,
356 struct v4l2_subdev_state *sd_state,
357 struct v4l2_subdev_format *fmt)
358 {
359 struct vsp1_histogram *histo = subdev_to_histo(subdev);
360
361 if (fmt->pad == HISTO_PAD_SOURCE) {
362 fmt->format.code = MEDIA_BUS_FMT_FIXED;
363 fmt->format.width = 0;
364 fmt->format.height = 0;
365 fmt->format.field = V4L2_FIELD_NONE;
366 fmt->format.colorspace = V4L2_COLORSPACE_RAW;
367
368 return 0;
369 }
370
371 return vsp1_subdev_set_pad_format(subdev, sd_state, fmt,
372 histo->formats, histo->num_formats,
373 HISTO_MIN_SIZE, HISTO_MIN_SIZE,
374 HISTO_MAX_SIZE, HISTO_MAX_SIZE);
375 }
376
377 static const struct v4l2_subdev_pad_ops histo_pad_ops = {
378 .enum_mbus_code = histo_enum_mbus_code,
379 .enum_frame_size = histo_enum_frame_size,
380 .get_fmt = vsp1_subdev_get_pad_format,
381 .set_fmt = histo_set_format,
382 .get_selection = histo_get_selection,
383 .set_selection = histo_set_selection,
384 };
385
386 static const struct v4l2_subdev_ops histo_ops = {
387 .pad = &histo_pad_ops,
388 };
389
390 /* -----------------------------------------------------------------------------
391 * V4L2 ioctls
392 */
393
histo_v4l2_querycap(struct file * file,void * fh,struct v4l2_capability * cap)394 static int histo_v4l2_querycap(struct file *file, void *fh,
395 struct v4l2_capability *cap)
396 {
397 struct v4l2_fh *vfh = file->private_data;
398 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev);
399
400 cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
401 | V4L2_CAP_VIDEO_CAPTURE_MPLANE
402 | V4L2_CAP_VIDEO_OUTPUT_MPLANE
403 | V4L2_CAP_META_CAPTURE;
404
405 strscpy(cap->driver, "vsp1", sizeof(cap->driver));
406 strscpy(cap->card, histo->video.name, sizeof(cap->card));
407
408 return 0;
409 }
410
histo_v4l2_enum_format(struct file * file,void * fh,struct v4l2_fmtdesc * f)411 static int histo_v4l2_enum_format(struct file *file, void *fh,
412 struct v4l2_fmtdesc *f)
413 {
414 struct v4l2_fh *vfh = file->private_data;
415 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev);
416
417 if (f->index > 0 || f->type != histo->queue.type)
418 return -EINVAL;
419
420 f->pixelformat = histo->meta_format;
421
422 return 0;
423 }
424
histo_v4l2_get_format(struct file * file,void * fh,struct v4l2_format * format)425 static int histo_v4l2_get_format(struct file *file, void *fh,
426 struct v4l2_format *format)
427 {
428 struct v4l2_fh *vfh = file->private_data;
429 struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev);
430 struct v4l2_meta_format *meta = &format->fmt.meta;
431
432 if (format->type != histo->queue.type)
433 return -EINVAL;
434
435 memset(meta, 0, sizeof(*meta));
436
437 meta->dataformat = histo->meta_format;
438 meta->buffersize = histo->data_size;
439
440 return 0;
441 }
442
443 static const struct v4l2_ioctl_ops histo_v4l2_ioctl_ops = {
444 .vidioc_querycap = histo_v4l2_querycap,
445 .vidioc_enum_fmt_meta_cap = histo_v4l2_enum_format,
446 .vidioc_g_fmt_meta_cap = histo_v4l2_get_format,
447 .vidioc_s_fmt_meta_cap = histo_v4l2_get_format,
448 .vidioc_try_fmt_meta_cap = histo_v4l2_get_format,
449 .vidioc_reqbufs = vb2_ioctl_reqbufs,
450 .vidioc_querybuf = vb2_ioctl_querybuf,
451 .vidioc_qbuf = vb2_ioctl_qbuf,
452 .vidioc_dqbuf = vb2_ioctl_dqbuf,
453 .vidioc_create_bufs = vb2_ioctl_create_bufs,
454 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
455 .vidioc_streamon = vb2_ioctl_streamon,
456 .vidioc_streamoff = vb2_ioctl_streamoff,
457 };
458
459 /* -----------------------------------------------------------------------------
460 * V4L2 File Operations
461 */
462
463 static const struct v4l2_file_operations histo_v4l2_fops = {
464 .owner = THIS_MODULE,
465 .unlocked_ioctl = video_ioctl2,
466 .open = v4l2_fh_open,
467 .release = vb2_fop_release,
468 .poll = vb2_fop_poll,
469 .mmap = vb2_fop_mmap,
470 };
471
vsp1_histogram_cleanup(struct vsp1_histogram * histo)472 static void vsp1_histogram_cleanup(struct vsp1_histogram *histo)
473 {
474 if (video_is_registered(&histo->video))
475 video_unregister_device(&histo->video);
476
477 media_entity_cleanup(&histo->video.entity);
478 }
479
vsp1_histogram_destroy(struct vsp1_entity * entity)480 void vsp1_histogram_destroy(struct vsp1_entity *entity)
481 {
482 struct vsp1_histogram *histo = subdev_to_histo(&entity->subdev);
483
484 vsp1_histogram_cleanup(histo);
485 }
486
vsp1_histogram_init(struct vsp1_device * vsp1,struct vsp1_histogram * histo,enum vsp1_entity_type type,const char * name,const struct vsp1_entity_operations * ops,const unsigned int * formats,unsigned int num_formats,size_t data_size,u32 meta_format)487 int vsp1_histogram_init(struct vsp1_device *vsp1, struct vsp1_histogram *histo,
488 enum vsp1_entity_type type, const char *name,
489 const struct vsp1_entity_operations *ops,
490 const unsigned int *formats, unsigned int num_formats,
491 size_t data_size, u32 meta_format)
492 {
493 int ret;
494
495 histo->formats = formats;
496 histo->num_formats = num_formats;
497 histo->data_size = data_size;
498 histo->meta_format = meta_format;
499
500 histo->pad.flags = MEDIA_PAD_FL_SINK;
501 histo->video.vfl_dir = VFL_DIR_RX;
502
503 mutex_init(&histo->lock);
504 spin_lock_init(&histo->irqlock);
505 INIT_LIST_HEAD(&histo->irqqueue);
506 init_waitqueue_head(&histo->wait_queue);
507
508 /* Initialize the VSP entity... */
509 histo->entity.ops = ops;
510 histo->entity.type = type;
511
512 ret = vsp1_entity_init(vsp1, &histo->entity, name, 2, &histo_ops,
513 MEDIA_ENT_F_PROC_VIDEO_STATISTICS);
514 if (ret < 0)
515 return ret;
516
517 /* ... and the media entity... */
518 ret = media_entity_pads_init(&histo->video.entity, 1, &histo->pad);
519 if (ret < 0)
520 return ret;
521
522 /* ... and the video node... */
523 histo->video.v4l2_dev = &vsp1->v4l2_dev;
524 histo->video.fops = &histo_v4l2_fops;
525 snprintf(histo->video.name, sizeof(histo->video.name),
526 "%s histo", histo->entity.subdev.name);
527 histo->video.vfl_type = VFL_TYPE_VIDEO;
528 histo->video.release = video_device_release_empty;
529 histo->video.ioctl_ops = &histo_v4l2_ioctl_ops;
530 histo->video.device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
531
532 video_set_drvdata(&histo->video, histo);
533
534 /* ... and the buffers queue... */
535 histo->queue.type = V4L2_BUF_TYPE_META_CAPTURE;
536 histo->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
537 histo->queue.lock = &histo->lock;
538 histo->queue.drv_priv = histo;
539 histo->queue.buf_struct_size = sizeof(struct vsp1_histogram_buffer);
540 histo->queue.ops = &histo_video_queue_qops;
541 histo->queue.mem_ops = &vb2_vmalloc_memops;
542 histo->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
543 histo->queue.dev = vsp1->dev;
544 ret = vb2_queue_init(&histo->queue);
545 if (ret < 0) {
546 dev_err(vsp1->dev, "failed to initialize vb2 queue\n");
547 goto error;
548 }
549
550 /* ... and register the video device. */
551 histo->video.queue = &histo->queue;
552 ret = video_register_device(&histo->video, VFL_TYPE_VIDEO, -1);
553 if (ret < 0) {
554 dev_err(vsp1->dev, "failed to register video device\n");
555 goto error;
556 }
557
558 return 0;
559
560 error:
561 vsp1_histogram_cleanup(histo);
562 return ret;
563 }
564