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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux...
[linux/fpc-iii.git] / drivers / media / platform / vim2m.c
blobc4b5fab836663d2ea07f9c240327d52f80529e83
1 /*
2 * A virtual v4l2-mem2mem example device.
3 *
4 * This is a virtual device driver for testing mem-to-mem videobuf framework.
5 * It simulates a device that uses memory buffers for both source and
6 * destination, processes the data and issues an "irq" (simulated by a timer).
7 * The device is capable of multi-instance, multi-buffer-per-transaction
8 * operation (via the mem2mem framework).
9 *
10 * Copyright (c) 2009-2010 Samsung Electronics Co., Ltd.
11 * Pawel Osciak, <pawel@osciak.com>
12 * Marek Szyprowski, <m.szyprowski@samsung.com>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by the
16 * Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version
18 */
19 #include <linux/module.h>
20 #include <linux/delay.h>
21 #include <linux/fs.h>
22 #include <linux/timer.h>
23 #include <linux/sched.h>
24 #include <linux/slab.h>
25
26 #include <linux/platform_device.h>
27 #include <media/v4l2-mem2mem.h>
28 #include <media/v4l2-device.h>
29 #include <media/v4l2-ioctl.h>
30 #include <media/v4l2-ctrls.h>
31 #include <media/v4l2-event.h>
32 #include <media/videobuf2-vmalloc.h>
33
34 MODULE_DESCRIPTION("Virtual device for mem2mem framework testing");
35 MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
36 MODULE_LICENSE("GPL");
37 MODULE_VERSION("0.1.1");
38 MODULE_ALIAS("mem2mem_testdev");
39
40 static unsigned debug;
41 module_param(debug, uint, 0644);
42 MODULE_PARM_DESC(debug, "activates debug info");
43
44 #define MIN_W 32
45 #define MIN_H 32
46 #define MAX_W 640
47 #define MAX_H 480
48 #define DIM_ALIGN_MASK 7 /* 8-byte alignment for line length */
49
50 /* Flags that indicate a format can be used for capture/output */
51 #define MEM2MEM_CAPTURE (1 << 0)
52 #define MEM2MEM_OUTPUT (1 << 1)
53
54 #define MEM2MEM_NAME "vim2m"
55
56 /* Per queue */
57 #define MEM2MEM_DEF_NUM_BUFS VIDEO_MAX_FRAME
58 /* In bytes, per queue */
59 #define MEM2MEM_VID_MEM_LIMIT (16 * 1024 * 1024)
60
61 /* Default transaction time in msec */
62 #define MEM2MEM_DEF_TRANSTIME 40
63 #define MEM2MEM_COLOR_STEP (0xff >> 4)
64 #define MEM2MEM_NUM_TILES 8
65
66 /* Flags that indicate processing mode */
67 #define MEM2MEM_HFLIP (1 << 0)
68 #define MEM2MEM_VFLIP (1 << 1)
69
70 #define dprintk(dev, fmt, arg...) \
71 v4l2_dbg(1, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)
72
73
74 static void vim2m_dev_release(struct device *dev)
75 {}
76
77 static struct platform_device vim2m_pdev = {
78 .name = MEM2MEM_NAME,
79 .dev.release = vim2m_dev_release,
80 };
81
82 struct vim2m_fmt {
83 u32 fourcc;
84 int depth;
85 /* Types the format can be used for */
86 u32 types;
87 };
88
89 static struct vim2m_fmt formats[] = {
90 {
91 .fourcc = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */
92 .depth = 16,
93 /* Both capture and output format */
94 .types = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
95 },
96 {
97 .fourcc = V4L2_PIX_FMT_YUYV,
98 .depth = 16,
99 /* Output-only format */
100 .types = MEM2MEM_OUTPUT,
101 },
102 };
103
104 #define NUM_FORMATS ARRAY_SIZE(formats)
105
106 /* Per-queue, driver-specific private data */
107 struct vim2m_q_data {
108 unsigned int width;
109 unsigned int height;
110 unsigned int sizeimage;
111 unsigned int sequence;
112 struct vim2m_fmt *fmt;
113 };
114
115 enum {
116 V4L2_M2M_SRC = 0,
117 V4L2_M2M_DST = 1,
118 };
119
120 #define V4L2_CID_TRANS_TIME_MSEC (V4L2_CID_USER_BASE + 0x1000)
121 #define V4L2_CID_TRANS_NUM_BUFS (V4L2_CID_USER_BASE + 0x1001)
122
123 static struct vim2m_fmt *find_format(struct v4l2_format *f)
124 {
125 struct vim2m_fmt *fmt;
126 unsigned int k;
127
128 for (k = 0; k < NUM_FORMATS; k++) {
129 fmt = &formats[k];
130 if (fmt->fourcc == f->fmt.pix.pixelformat)
131 break;
132 }
133
134 if (k == NUM_FORMATS)
135 return NULL;
136
137 return &formats[k];
138 }
139
140 struct vim2m_dev {
141 struct v4l2_device v4l2_dev;
142 struct video_device vfd;
143
144 atomic_t num_inst;
145 struct mutex dev_mutex;
146 spinlock_t irqlock;
147
148 struct timer_list timer;
149
150 struct v4l2_m2m_dev *m2m_dev;
151 };
152
153 struct vim2m_ctx {
154 struct v4l2_fh fh;
155 struct vim2m_dev *dev;
156
157 struct v4l2_ctrl_handler hdl;
158
159 /* Processed buffers in this transaction */
160 u8 num_processed;
161
162 /* Transaction length (i.e. how many buffers per transaction) */
163 u32 translen;
164 /* Transaction time (i.e. simulated processing time) in milliseconds */
165 u32 transtime;
166
167 /* Abort requested by m2m */
168 int aborting;
169
170 /* Processing mode */
171 int mode;
172
173 enum v4l2_colorspace colorspace;
174
175 /* Source and destination queue data */
176 struct vim2m_q_data q_data[2];
177 };
178
179 static inline struct vim2m_ctx *file2ctx(struct file *file)
180 {
181 return container_of(file->private_data, struct vim2m_ctx, fh);
182 }
183
184 static struct vim2m_q_data *get_q_data(struct vim2m_ctx *ctx,
185 enum v4l2_buf_type type)
186 {
187 switch (type) {
188 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
189 return &ctx->q_data[V4L2_M2M_SRC];
190 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
191 return &ctx->q_data[V4L2_M2M_DST];
192 default:
193 BUG();
194 }
195 return NULL;
196 }
197
198
199 static int device_process(struct vim2m_ctx *ctx,
200 struct vb2_v4l2_buffer *in_vb,
201 struct vb2_v4l2_buffer *out_vb)
202 {
203 struct vim2m_dev *dev = ctx->dev;
204 struct vim2m_q_data *q_data;
205 u8 *p_in, *p_out;
206 int x, y, t, w;
207 int tile_w, bytes_left;
208 int width, height, bytesperline;
209
210 q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
211
212 width = q_data->width;
213 height = q_data->height;
214 bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
215
216 p_in = vb2_plane_vaddr(&in_vb->vb2_buf, 0);
217 p_out = vb2_plane_vaddr(&out_vb->vb2_buf, 0);
218 if (!p_in || !p_out) {
219 v4l2_err(&dev->v4l2_dev,
220 "Acquiring kernel pointers to buffers failed\n");
221 return -EFAULT;
222 }
223
224 if (vb2_plane_size(&in_vb->vb2_buf, 0) >
225 vb2_plane_size(&out_vb->vb2_buf, 0)) {
226 v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n");
227 return -EINVAL;
228 }
229
230 tile_w = (width * (q_data[V4L2_M2M_DST].fmt->depth >> 3))
231 / MEM2MEM_NUM_TILES;
232 bytes_left = bytesperline - tile_w * MEM2MEM_NUM_TILES;
233 w = 0;
234
235 out_vb->sequence =
236 get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE)->sequence++;
237 in_vb->sequence = q_data->sequence++;
238 out_vb->vb2_buf.timestamp = in_vb->vb2_buf.timestamp;
239
240 if (in_vb->flags & V4L2_BUF_FLAG_TIMECODE)
241 out_vb->timecode = in_vb->timecode;
242 out_vb->field = in_vb->field;
243 out_vb->flags = in_vb->flags &
244 (V4L2_BUF_FLAG_TIMECODE |
245 V4L2_BUF_FLAG_KEYFRAME |
246 V4L2_BUF_FLAG_PFRAME |
247 V4L2_BUF_FLAG_BFRAME |
248 V4L2_BUF_FLAG_TSTAMP_SRC_MASK);
249
250 switch (ctx->mode) {
251 case MEM2MEM_HFLIP | MEM2MEM_VFLIP:
252 p_out += bytesperline * height - bytes_left;
253 for (y = 0; y < height; ++y) {
254 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
255 if (w & 0x1) {
256 for (x = 0; x < tile_w; ++x)
257 *--p_out = *p_in++ +
258 MEM2MEM_COLOR_STEP;
259 } else {
260 for (x = 0; x < tile_w; ++x)
261 *--p_out = *p_in++ -
262 MEM2MEM_COLOR_STEP;
263 }
264 ++w;
265 }
266 p_in += bytes_left;
267 p_out -= bytes_left;
268 }
269 break;
270
271 case MEM2MEM_HFLIP:
272 for (y = 0; y < height; ++y) {
273 p_out += MEM2MEM_NUM_TILES * tile_w;
274 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
275 if (w & 0x01) {
276 for (x = 0; x < tile_w; ++x)
277 *--p_out = *p_in++ +
278 MEM2MEM_COLOR_STEP;
279 } else {
280 for (x = 0; x < tile_w; ++x)
281 *--p_out = *p_in++ -
282 MEM2MEM_COLOR_STEP;
283 }
284 ++w;
285 }
286 p_in += bytes_left;
287 p_out += bytesperline;
288 }
289 break;
290
291 case MEM2MEM_VFLIP:
292 p_out += bytesperline * (height - 1);
293 for (y = 0; y < height; ++y) {
294 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
295 if (w & 0x1) {
296 for (x = 0; x < tile_w; ++x)
297 *p_out++ = *p_in++ +
298 MEM2MEM_COLOR_STEP;
299 } else {
300 for (x = 0; x < tile_w; ++x)
301 *p_out++ = *p_in++ -
302 MEM2MEM_COLOR_STEP;
303 }
304 ++w;
305 }
306 p_in += bytes_left;
307 p_out += bytes_left - 2 * bytesperline;
308 }
309 break;
310
311 default:
312 for (y = 0; y < height; ++y) {
313 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
314 if (w & 0x1) {
315 for (x = 0; x < tile_w; ++x)
316 *p_out++ = *p_in++ +
317 MEM2MEM_COLOR_STEP;
318 } else {
319 for (x = 0; x < tile_w; ++x)
320 *p_out++ = *p_in++ -
321 MEM2MEM_COLOR_STEP;
322 }
323 ++w;
324 }
325 p_in += bytes_left;
326 p_out += bytes_left;
327 }
328 }
329
330 return 0;
331 }
332
333 static void schedule_irq(struct vim2m_dev *dev, int msec_timeout)
334 {
335 dprintk(dev, "Scheduling a simulated irq\n");
336 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout));
337 }
338
339 /*
340 * mem2mem callbacks
341 */
342
343 /**
344 * job_ready() - check whether an instance is ready to be scheduled to run
345 */
346 static int job_ready(void *priv)
347 {
348 struct vim2m_ctx *ctx = priv;
349
350 if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen
351 || v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen) {
352 dprintk(ctx->dev, "Not enough buffers available\n");
353 return 0;
354 }
355
356 return 1;
357 }
358
359 static void job_abort(void *priv)
360 {
361 struct vim2m_ctx *ctx = priv;
362
363 /* Will cancel the transaction in the next interrupt handler */
364 ctx->aborting = 1;
365 }
366
367 /* device_run() - prepares and starts the device
368 *
369 * This simulates all the immediate preparations required before starting
370 * a device. This will be called by the framework when it decides to schedule
371 * a particular instance.
372 */
373 static void device_run(void *priv)
374 {
375 struct vim2m_ctx *ctx = priv;
376 struct vim2m_dev *dev = ctx->dev;
377 struct vb2_v4l2_buffer *src_buf, *dst_buf;
378
379 src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
380 dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
381
382 device_process(ctx, src_buf, dst_buf);
383
384 /* Run a timer, which simulates a hardware irq */
385 schedule_irq(dev, ctx->transtime);
386 }
387
388 static void device_isr(unsigned long priv)
389 {
390 struct vim2m_dev *vim2m_dev = (struct vim2m_dev *)priv;
391 struct vim2m_ctx *curr_ctx;
392 struct vb2_v4l2_buffer *src_vb, *dst_vb;
393 unsigned long flags;
394
395 curr_ctx = v4l2_m2m_get_curr_priv(vim2m_dev->m2m_dev);
396
397 if (NULL == curr_ctx) {
398 pr_err("Instance released before the end of transaction\n");
399 return;
400 }
401
402 src_vb = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx);
403 dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx);
404
405 curr_ctx->num_processed++;
406
407 spin_lock_irqsave(&vim2m_dev->irqlock, flags);
408 v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
409 v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
410 spin_unlock_irqrestore(&vim2m_dev->irqlock, flags);
411
412 if (curr_ctx->num_processed == curr_ctx->translen
413 || curr_ctx->aborting) {
414 dprintk(curr_ctx->dev, "Finishing transaction\n");
415 curr_ctx->num_processed = 0;
416 v4l2_m2m_job_finish(vim2m_dev->m2m_dev, curr_ctx->fh.m2m_ctx);
417 } else {
418 device_run(curr_ctx);
419 }
420 }
421
422 /*
423 * video ioctls
424 */
425 static int vidioc_querycap(struct file *file, void *priv,
426 struct v4l2_capability *cap)
427 {
428 strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
429 strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
430 snprintf(cap->bus_info, sizeof(cap->bus_info),
431 "platform:%s", MEM2MEM_NAME);
432 cap->device_caps = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
433 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
434 return 0;
435 }
436
437 static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
438 {
439 int i, num;
440 struct vim2m_fmt *fmt;
441
442 num = 0;
443
444 for (i = 0; i < NUM_FORMATS; ++i) {
445 if (formats[i].types & type) {
446 /* index-th format of type type found ? */
447 if (num == f->index)
448 break;
449 /* Correct type but haven't reached our index yet,
450 * just increment per-type index */
451 ++num;
452 }
453 }
454
455 if (i < NUM_FORMATS) {
456 /* Format found */
457 fmt = &formats[i];
458 f->pixelformat = fmt->fourcc;
459 return 0;
460 }
461
462 /* Format not found */
463 return -EINVAL;
464 }
465
466 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
467 struct v4l2_fmtdesc *f)
468 {
469 return enum_fmt(f, MEM2MEM_CAPTURE);
470 }
471
472 static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
473 struct v4l2_fmtdesc *f)
474 {
475 return enum_fmt(f, MEM2MEM_OUTPUT);
476 }
477
478 static int vidioc_g_fmt(struct vim2m_ctx *ctx, struct v4l2_format *f)
479 {
480 struct vb2_queue *vq;
481 struct vim2m_q_data *q_data;
482
483 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
484 if (!vq)
485 return -EINVAL;
486
487 q_data = get_q_data(ctx, f->type);
488
489 f->fmt.pix.width = q_data->width;
490 f->fmt.pix.height = q_data->height;
491 f->fmt.pix.field = V4L2_FIELD_NONE;
492 f->fmt.pix.pixelformat = q_data->fmt->fourcc;
493 f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
494 f->fmt.pix.sizeimage = q_data->sizeimage;
495 f->fmt.pix.colorspace = ctx->colorspace;
496
497 return 0;
498 }
499
500 static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
501 struct v4l2_format *f)
502 {
503 return vidioc_g_fmt(file2ctx(file), f);
504 }
505
506 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
507 struct v4l2_format *f)
508 {
509 return vidioc_g_fmt(file2ctx(file), f);
510 }
511
512 static int vidioc_try_fmt(struct v4l2_format *f, struct vim2m_fmt *fmt)
513 {
514 /* V4L2 specification suggests the driver corrects the format struct
515 * if any of the dimensions is unsupported */
516 if (f->fmt.pix.height < MIN_H)
517 f->fmt.pix.height = MIN_H;
518 else if (f->fmt.pix.height > MAX_H)
519 f->fmt.pix.height = MAX_H;
520
521 if (f->fmt.pix.width < MIN_W)
522 f->fmt.pix.width = MIN_W;
523 else if (f->fmt.pix.width > MAX_W)
524 f->fmt.pix.width = MAX_W;
525
526 f->fmt.pix.width &= ~DIM_ALIGN_MASK;
527 f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
528 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
529 f->fmt.pix.field = V4L2_FIELD_NONE;
530
531 return 0;
532 }
533
534 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
535 struct v4l2_format *f)
536 {
537 struct vim2m_fmt *fmt;
538 struct vim2m_ctx *ctx = file2ctx(file);
539
540 fmt = find_format(f);
541 if (!fmt) {
542 f->fmt.pix.pixelformat = formats[0].fourcc;
543 fmt = find_format(f);
544 }
545 if (!(fmt->types & MEM2MEM_CAPTURE)) {
546 v4l2_err(&ctx->dev->v4l2_dev,
547 "Fourcc format (0x%08x) invalid.\n",
548 f->fmt.pix.pixelformat);
549 return -EINVAL;
550 }
551 f->fmt.pix.colorspace = ctx->colorspace;
552
553 return vidioc_try_fmt(f, fmt);
554 }
555
556 static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
557 struct v4l2_format *f)
558 {
559 struct vim2m_fmt *fmt;
560 struct vim2m_ctx *ctx = file2ctx(file);
561
562 fmt = find_format(f);
563 if (!fmt) {
564 f->fmt.pix.pixelformat = formats[0].fourcc;
565 fmt = find_format(f);
566 }
567 if (!(fmt->types & MEM2MEM_OUTPUT)) {
568 v4l2_err(&ctx->dev->v4l2_dev,
569 "Fourcc format (0x%08x) invalid.\n",
570 f->fmt.pix.pixelformat);
571 return -EINVAL;
572 }
573 if (!f->fmt.pix.colorspace)
574 f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
575
576 return vidioc_try_fmt(f, fmt);
577 }
578
579 static int vidioc_s_fmt(struct vim2m_ctx *ctx, struct v4l2_format *f)
580 {
581 struct vim2m_q_data *q_data;
582 struct vb2_queue *vq;
583
584 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
585 if (!vq)
586 return -EINVAL;
587
588 q_data = get_q_data(ctx, f->type);
589 if (!q_data)
590 return -EINVAL;
591
592 if (vb2_is_busy(vq)) {
593 v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
594 return -EBUSY;
595 }
596
597 q_data->fmt = find_format(f);
598 q_data->width = f->fmt.pix.width;
599 q_data->height = f->fmt.pix.height;
600 q_data->sizeimage = q_data->width * q_data->height
601 * q_data->fmt->depth >> 3;
602
603 dprintk(ctx->dev,
604 "Setting format for type %d, wxh: %dx%d, fmt: %d\n",
605 f->type, q_data->width, q_data->height, q_data->fmt->fourcc);
606
607 return 0;
608 }
609
610 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
611 struct v4l2_format *f)
612 {
613 int ret;
614
615 ret = vidioc_try_fmt_vid_cap(file, priv, f);
616 if (ret)
617 return ret;
618
619 return vidioc_s_fmt(file2ctx(file), f);
620 }
621
622 static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
623 struct v4l2_format *f)
624 {
625 struct vim2m_ctx *ctx = file2ctx(file);
626 int ret;
627
628 ret = vidioc_try_fmt_vid_out(file, priv, f);
629 if (ret)
630 return ret;
631
632 ret = vidioc_s_fmt(file2ctx(file), f);
633 if (!ret)
634 ctx->colorspace = f->fmt.pix.colorspace;
635 return ret;
636 }
637
638 static int vim2m_s_ctrl(struct v4l2_ctrl *ctrl)
639 {
640 struct vim2m_ctx *ctx =
641 container_of(ctrl->handler, struct vim2m_ctx, hdl);
642
643 switch (ctrl->id) {
644 case V4L2_CID_HFLIP:
645 if (ctrl->val)
646 ctx->mode |= MEM2MEM_HFLIP;
647 else
648 ctx->mode &= ~MEM2MEM_HFLIP;
649 break;
650
651 case V4L2_CID_VFLIP:
652 if (ctrl->val)
653 ctx->mode |= MEM2MEM_VFLIP;
654 else
655 ctx->mode &= ~MEM2MEM_VFLIP;
656 break;
657
658 case V4L2_CID_TRANS_TIME_MSEC:
659 ctx->transtime = ctrl->val;
660 break;
661
662 case V4L2_CID_TRANS_NUM_BUFS:
663 ctx->translen = ctrl->val;
664 break;
665
666 default:
667 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
668 return -EINVAL;
669 }
670
671 return 0;
672 }
673
674 static const struct v4l2_ctrl_ops vim2m_ctrl_ops = {
675 .s_ctrl = vim2m_s_ctrl,
676 };
677
678
679 static const struct v4l2_ioctl_ops vim2m_ioctl_ops = {
680 .vidioc_querycap = vidioc_querycap,
681
682 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
683 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
684 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
685 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
686
687 .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
688 .vidioc_g_fmt_vid_out = vidioc_g_fmt_vid_out,
689 .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out,
690 .vidioc_s_fmt_vid_out = vidioc_s_fmt_vid_out,
691
692 .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs,
693 .vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
694 .vidioc_qbuf = v4l2_m2m_ioctl_qbuf,
695 .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
696 .vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
697 .vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
698 .vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
699
700 .vidioc_streamon = v4l2_m2m_ioctl_streamon,
701 .vidioc_streamoff = v4l2_m2m_ioctl_streamoff,
702
703 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
704 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
705 };
706
707
708 /*
709 * Queue operations
710 */
711
712 static int vim2m_queue_setup(struct vb2_queue *vq,
713 unsigned int *nbuffers, unsigned int *nplanes,
714 unsigned int sizes[], void *alloc_ctxs[])
715 {
716 struct vim2m_ctx *ctx = vb2_get_drv_priv(vq);
717 struct vim2m_q_data *q_data;
718 unsigned int size, count = *nbuffers;
719
720 q_data = get_q_data(ctx, vq->type);
721
722 size = q_data->width * q_data->height * q_data->fmt->depth >> 3;
723
724 while (size * count > MEM2MEM_VID_MEM_LIMIT)
725 (count)--;
726 *nbuffers = count;
727
728 if (*nplanes)
729 return sizes[0] < size ? -EINVAL : 0;
730
731 *nplanes = 1;
732 sizes[0] = size;
733
734 /*
735 * videobuf2-vmalloc allocator is context-less so no need to set
736 * alloc_ctxs array.
737 */
738
739 dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size);
740
741 return 0;
742 }
743
744 static int vim2m_buf_prepare(struct vb2_buffer *vb)
745 {
746 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
747 struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
748 struct vim2m_q_data *q_data;
749
750 dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type);
751
752 q_data = get_q_data(ctx, vb->vb2_queue->type);
753 if (V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) {
754 if (vbuf->field == V4L2_FIELD_ANY)
755 vbuf->field = V4L2_FIELD_NONE;
756 if (vbuf->field != V4L2_FIELD_NONE) {
757 dprintk(ctx->dev, "%s field isn't supported\n",
758 __func__);
759 return -EINVAL;
760 }
761 }
762
763 if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
764 dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n",
765 __func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage);
766 return -EINVAL;
767 }
768
769 vb2_set_plane_payload(vb, 0, q_data->sizeimage);
770
771 return 0;
772 }
773
774 static void vim2m_buf_queue(struct vb2_buffer *vb)
775 {
776 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
777 struct vim2m_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
778
779 v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
780 }
781
782 static int vim2m_start_streaming(struct vb2_queue *q, unsigned count)
783 {
784 struct vim2m_ctx *ctx = vb2_get_drv_priv(q);
785 struct vim2m_q_data *q_data = get_q_data(ctx, q->type);
786
787 q_data->sequence = 0;
788 return 0;
789 }
790
791 static void vim2m_stop_streaming(struct vb2_queue *q)
792 {
793 struct vim2m_ctx *ctx = vb2_get_drv_priv(q);
794 struct vb2_v4l2_buffer *vbuf;
795 unsigned long flags;
796
797 for (;;) {
798 if (V4L2_TYPE_IS_OUTPUT(q->type))
799 vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
800 else
801 vbuf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
802 if (vbuf == NULL)
803 return;
804 spin_lock_irqsave(&ctx->dev->irqlock, flags);
805 v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
806 spin_unlock_irqrestore(&ctx->dev->irqlock, flags);
807 }
808 }
809
810 static struct vb2_ops vim2m_qops = {
811 .queue_setup = vim2m_queue_setup,
812 .buf_prepare = vim2m_buf_prepare,
813 .buf_queue = vim2m_buf_queue,
814 .start_streaming = vim2m_start_streaming,
815 .stop_streaming = vim2m_stop_streaming,
816 .wait_prepare = vb2_ops_wait_prepare,
817 .wait_finish = vb2_ops_wait_finish,
818 };
819
820 static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
821 {
822 struct vim2m_ctx *ctx = priv;
823 int ret;
824
825 src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
826 src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
827 src_vq->drv_priv = ctx;
828 src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
829 src_vq->ops = &vim2m_qops;
830 src_vq->mem_ops = &vb2_vmalloc_memops;
831 src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
832 src_vq->lock = &ctx->dev->dev_mutex;
833
834 ret = vb2_queue_init(src_vq);
835 if (ret)
836 return ret;
837
838 dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
839 dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
840 dst_vq->drv_priv = ctx;
841 dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
842 dst_vq->ops = &vim2m_qops;
843 dst_vq->mem_ops = &vb2_vmalloc_memops;
844 dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
845 dst_vq->lock = &ctx->dev->dev_mutex;
846
847 return vb2_queue_init(dst_vq);
848 }
849
850 static const struct v4l2_ctrl_config vim2m_ctrl_trans_time_msec = {
851 .ops = &vim2m_ctrl_ops,
852 .id = V4L2_CID_TRANS_TIME_MSEC,
853 .name = "Transaction Time (msec)",
854 .type = V4L2_CTRL_TYPE_INTEGER,
855 .def = MEM2MEM_DEF_TRANSTIME,
856 .min = 1,
857 .max = 10001,
858 .step = 1,
859 };
860
861 static const struct v4l2_ctrl_config vim2m_ctrl_trans_num_bufs = {
862 .ops = &vim2m_ctrl_ops,
863 .id = V4L2_CID_TRANS_NUM_BUFS,
864 .name = "Buffers Per Transaction",
865 .type = V4L2_CTRL_TYPE_INTEGER,
866 .def = 1,
867 .min = 1,
868 .max = MEM2MEM_DEF_NUM_BUFS,
869 .step = 1,
870 };
871
872 /*
873 * File operations
874 */
875 static int vim2m_open(struct file *file)
876 {
877 struct vim2m_dev *dev = video_drvdata(file);
878 struct vim2m_ctx *ctx = NULL;
879 struct v4l2_ctrl_handler *hdl;
880 int rc = 0;
881
882 if (mutex_lock_interruptible(&dev->dev_mutex))
883 return -ERESTARTSYS;
884 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
885 if (!ctx) {
886 rc = -ENOMEM;
887 goto open_unlock;
888 }
889
890 v4l2_fh_init(&ctx->fh, video_devdata(file));
891 file->private_data = &ctx->fh;
892 ctx->dev = dev;
893 hdl = &ctx->hdl;
894 v4l2_ctrl_handler_init(hdl, 4);
895 v4l2_ctrl_new_std(hdl, &vim2m_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
896 v4l2_ctrl_new_std(hdl, &vim2m_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
897 v4l2_ctrl_new_custom(hdl, &vim2m_ctrl_trans_time_msec, NULL);
898 v4l2_ctrl_new_custom(hdl, &vim2m_ctrl_trans_num_bufs, NULL);
899 if (hdl->error) {
900 rc = hdl->error;
901 v4l2_ctrl_handler_free(hdl);
902 goto open_unlock;
903 }
904 ctx->fh.ctrl_handler = hdl;
905 v4l2_ctrl_handler_setup(hdl);
906
907 ctx->q_data[V4L2_M2M_SRC].fmt = &formats[0];
908 ctx->q_data[V4L2_M2M_SRC].width = 640;
909 ctx->q_data[V4L2_M2M_SRC].height = 480;
910 ctx->q_data[V4L2_M2M_SRC].sizeimage =
911 ctx->q_data[V4L2_M2M_SRC].width *
912 ctx->q_data[V4L2_M2M_SRC].height *
913 (ctx->q_data[V4L2_M2M_SRC].fmt->depth >> 3);
914 ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC];
915 ctx->colorspace = V4L2_COLORSPACE_REC709;
916
917 ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
918
919 if (IS_ERR(ctx->fh.m2m_ctx)) {
920 rc = PTR_ERR(ctx->fh.m2m_ctx);
921
922 v4l2_ctrl_handler_free(hdl);
923 kfree(ctx);
924 goto open_unlock;
925 }
926
927 v4l2_fh_add(&ctx->fh);
928 atomic_inc(&dev->num_inst);
929
930 dprintk(dev, "Created instance: %p, m2m_ctx: %p\n",
931 ctx, ctx->fh.m2m_ctx);
932
933 open_unlock:
934 mutex_unlock(&dev->dev_mutex);
935 return rc;
936 }
937
938 static int vim2m_release(struct file *file)
939 {
940 struct vim2m_dev *dev = video_drvdata(file);
941 struct vim2m_ctx *ctx = file2ctx(file);
942
943 dprintk(dev, "Releasing instance %p\n", ctx);
944
945 v4l2_fh_del(&ctx->fh);
946 v4l2_fh_exit(&ctx->fh);
947 v4l2_ctrl_handler_free(&ctx->hdl);
948 mutex_lock(&dev->dev_mutex);
949 v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
950 mutex_unlock(&dev->dev_mutex);
951 kfree(ctx);
952
953 atomic_dec(&dev->num_inst);
954
955 return 0;
956 }
957
958 static const struct v4l2_file_operations vim2m_fops = {
959 .owner = THIS_MODULE,
960 .open = vim2m_open,
961 .release = vim2m_release,
962 .poll = v4l2_m2m_fop_poll,
963 .unlocked_ioctl = video_ioctl2,
964 .mmap = v4l2_m2m_fop_mmap,
965 };
966
967 static struct video_device vim2m_videodev = {
968 .name = MEM2MEM_NAME,
969 .vfl_dir = VFL_DIR_M2M,
970 .fops = &vim2m_fops,
971 .ioctl_ops = &vim2m_ioctl_ops,
972 .minor = -1,
973 .release = video_device_release_empty,
974 };
975
976 static struct v4l2_m2m_ops m2m_ops = {
977 .device_run = device_run,
978 .job_ready = job_ready,
979 .job_abort = job_abort,
980 };
981
982 static int vim2m_probe(struct platform_device *pdev)
983 {
984 struct vim2m_dev *dev;
985 struct video_device *vfd;
986 int ret;
987
988 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
989 if (!dev)
990 return -ENOMEM;
991
992 spin_lock_init(&dev->irqlock);
993
994 ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
995 if (ret)
996 return ret;
997
998 atomic_set(&dev->num_inst, 0);
999 mutex_init(&dev->dev_mutex);
1000
1001 dev->vfd = vim2m_videodev;
1002 vfd = &dev->vfd;
1003 vfd->lock = &dev->dev_mutex;
1004 vfd->v4l2_dev = &dev->v4l2_dev;
1005
1006 ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
1007 if (ret) {
1008 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
1009 goto unreg_dev;
1010 }
1011
1012 video_set_drvdata(vfd, dev);
1013 snprintf(vfd->name, sizeof(vfd->name), "%s", vim2m_videodev.name);
1014 v4l2_info(&dev->v4l2_dev,
1015 "Device registered as /dev/video%d\n", vfd->num);
1016
1017 setup_timer(&dev->timer, device_isr, (long)dev);
1018 platform_set_drvdata(pdev, dev);
1019
1020 dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
1021 if (IS_ERR(dev->m2m_dev)) {
1022 v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
1023 ret = PTR_ERR(dev->m2m_dev);
1024 goto err_m2m;
1025 }
1026
1027 return 0;
1028
1029 err_m2m:
1030 v4l2_m2m_release(dev->m2m_dev);
1031 video_unregister_device(&dev->vfd);
1032 unreg_dev:
1033 v4l2_device_unregister(&dev->v4l2_dev);
1034
1035 return ret;
1036 }
1037
1038 static int vim2m_remove(struct platform_device *pdev)
1039 {
1040 struct vim2m_dev *dev = platform_get_drvdata(pdev);
1041
1042 v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_NAME);
1043 v4l2_m2m_release(dev->m2m_dev);
1044 del_timer_sync(&dev->timer);
1045 video_unregister_device(&dev->vfd);
1046 v4l2_device_unregister(&dev->v4l2_dev);
1047
1048 return 0;
1049 }
1050
1051 static struct platform_driver vim2m_pdrv = {
1052 .probe = vim2m_probe,
1053 .remove = vim2m_remove,
1054 .driver = {
1055 .name = MEM2MEM_NAME,
1056 },
1057 };
1058
1059 static void __exit vim2m_exit(void)
1060 {
1061 platform_driver_unregister(&vim2m_pdrv);
1062 platform_device_unregister(&vim2m_pdev);
1063 }
1064
1065 static int __init vim2m_init(void)
1066 {
1067 int ret;
1068
1069 ret = platform_device_register(&vim2m_pdev);
1070 if (ret)
1071 return ret;
1072
1073 ret = platform_driver_register(&vim2m_pdrv);
1074 if (ret)
1075 platform_device_unregister(&vim2m_pdev);
1076
1077 return ret;
1078 }
1079
1080 module_init(vim2m_init);
1081 module_exit(vim2m_exit);
Linux with added FPC-III support