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 #define MEM2MEM_TEST_MODULE_NAME "mem2mem-testdev"
35
36 MODULE_DESCRIPTION("Virtual device for mem2mem framework testing");
37 MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
38 MODULE_LICENSE("GPL");
39 MODULE_VERSION("0.1.1");
40
41 static unsigned debug;
42 module_param(debug, uint, 0644);
43 MODULE_PARM_DESC(debug, "activates debug info");
44
45 #define MIN_W 32
46 #define MIN_H 32
47 #define MAX_W 640
48 #define MAX_H 480
49 #define DIM_ALIGN_MASK 7 /* 8-byte alignment for line length */
50
51 /* Flags that indicate a format can be used for capture/output */
52 #define MEM2MEM_CAPTURE (1 << 0)
53 #define MEM2MEM_OUTPUT (1 << 1)
54
55 #define MEM2MEM_NAME "m2m-testdev"
56
57 /* Per queue */
58 #define MEM2MEM_DEF_NUM_BUFS VIDEO_MAX_FRAME
59 /* In bytes, per queue */
60 #define MEM2MEM_VID_MEM_LIMIT (16 * 1024 * 1024)
61
62 /* Default transaction time in msec */
63 #define MEM2MEM_DEF_TRANSTIME 40
64 #define MEM2MEM_COLOR_STEP (0xff >> 4)
65 #define MEM2MEM_NUM_TILES 8
66
67 /* Flags that indicate processing mode */
68 #define MEM2MEM_HFLIP (1 << 0)
69 #define MEM2MEM_VFLIP (1 << 1)
70
71 #define dprintk(dev, fmt, arg...) \
72 v4l2_dbg(1, debug, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)
73
74
m2mtest_dev_release(struct device * dev)75 static void m2mtest_dev_release(struct device *dev)
76 {}
77
78 static struct platform_device m2mtest_pdev = {
79 .name = MEM2MEM_NAME,
80 .dev.release = m2mtest_dev_release,
81 };
82
83 struct m2mtest_fmt {
84 char *name;
85 u32 fourcc;
86 int depth;
87 /* Types the format can be used for */
88 u32 types;
89 };
90
91 static struct m2mtest_fmt formats[] = {
92 {
93 .name = "RGB565 (BE)",
94 .fourcc = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */
95 .depth = 16,
96 /* Both capture and output format */
97 .types = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
98 },
99 {
100 .name = "4:2:2, packed, YUYV",
101 .fourcc = V4L2_PIX_FMT_YUYV,
102 .depth = 16,
103 /* Output-only format */
104 .types = MEM2MEM_OUTPUT,
105 },
106 };
107
108 #define NUM_FORMATS ARRAY_SIZE(formats)
109
110 /* Per-queue, driver-specific private data */
111 struct m2mtest_q_data {
112 unsigned int width;
113 unsigned int height;
114 unsigned int sizeimage;
115 unsigned int sequence;
116 struct m2mtest_fmt *fmt;
117 };
118
119 enum {
120 V4L2_M2M_SRC = 0,
121 V4L2_M2M_DST = 1,
122 };
123
124 #define V4L2_CID_TRANS_TIME_MSEC (V4L2_CID_USER_BASE + 0x1000)
125 #define V4L2_CID_TRANS_NUM_BUFS (V4L2_CID_USER_BASE + 0x1001)
126
find_format(struct v4l2_format * f)127 static struct m2mtest_fmt *find_format(struct v4l2_format *f)
128 {
129 struct m2mtest_fmt *fmt;
130 unsigned int k;
131
132 for (k = 0; k < NUM_FORMATS; k++) {
133 fmt = &formats[k];
134 if (fmt->fourcc == f->fmt.pix.pixelformat)
135 break;
136 }
137
138 if (k == NUM_FORMATS)
139 return NULL;
140
141 return &formats[k];
142 }
143
144 struct m2mtest_dev {
145 struct v4l2_device v4l2_dev;
146 struct video_device *vfd;
147
148 atomic_t num_inst;
149 struct mutex dev_mutex;
150 spinlock_t irqlock;
151
152 struct timer_list timer;
153
154 struct v4l2_m2m_dev *m2m_dev;
155 };
156
157 struct m2mtest_ctx {
158 struct v4l2_fh fh;
159 struct m2mtest_dev *dev;
160
161 struct v4l2_ctrl_handler hdl;
162
163 /* Processed buffers in this transaction */
164 u8 num_processed;
165
166 /* Transaction length (i.e. how many buffers per transaction) */
167 u32 translen;
168 /* Transaction time (i.e. simulated processing time) in milliseconds */
169 u32 transtime;
170
171 /* Abort requested by m2m */
172 int aborting;
173
174 /* Processing mode */
175 int mode;
176
177 enum v4l2_colorspace colorspace;
178
179 /* Source and destination queue data */
180 struct m2mtest_q_data q_data[2];
181 };
182
file2ctx(struct file * file)183 static inline struct m2mtest_ctx *file2ctx(struct file *file)
184 {
185 return container_of(file->private_data, struct m2mtest_ctx, fh);
186 }
187
get_q_data(struct m2mtest_ctx * ctx,enum v4l2_buf_type type)188 static struct m2mtest_q_data *get_q_data(struct m2mtest_ctx *ctx,
189 enum v4l2_buf_type type)
190 {
191 switch (type) {
192 case V4L2_BUF_TYPE_VIDEO_OUTPUT:
193 return &ctx->q_data[V4L2_M2M_SRC];
194 case V4L2_BUF_TYPE_VIDEO_CAPTURE:
195 return &ctx->q_data[V4L2_M2M_DST];
196 default:
197 BUG();
198 }
199 return NULL;
200 }
201
202
device_process(struct m2mtest_ctx * ctx,struct vb2_buffer * in_vb,struct vb2_buffer * out_vb)203 static int device_process(struct m2mtest_ctx *ctx,
204 struct vb2_buffer *in_vb,
205 struct vb2_buffer *out_vb)
206 {
207 struct m2mtest_dev *dev = ctx->dev;
208 struct m2mtest_q_data *q_data;
209 u8 *p_in, *p_out;
210 int x, y, t, w;
211 int tile_w, bytes_left;
212 int width, height, bytesperline;
213
214 q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
215
216 width = q_data->width;
217 height = q_data->height;
218 bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
219
220 p_in = vb2_plane_vaddr(in_vb, 0);
221 p_out = vb2_plane_vaddr(out_vb, 0);
222 if (!p_in || !p_out) {
223 v4l2_err(&dev->v4l2_dev,
224 "Acquiring kernel pointers to buffers failed\n");
225 return -EFAULT;
226 }
227
228 if (vb2_plane_size(in_vb, 0) > vb2_plane_size(out_vb, 0)) {
229 v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n");
230 return -EINVAL;
231 }
232
233 tile_w = (width * (q_data[V4L2_M2M_DST].fmt->depth >> 3))
234 / MEM2MEM_NUM_TILES;
235 bytes_left = bytesperline - tile_w * MEM2MEM_NUM_TILES;
236 w = 0;
237
238 out_vb->v4l2_buf.sequence = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE)->sequence++;
239 in_vb->v4l2_buf.sequence = q_data->sequence++;
240 memcpy(&out_vb->v4l2_buf.timestamp,
241 &in_vb->v4l2_buf.timestamp,
242 sizeof(struct timeval));
243 if (in_vb->v4l2_buf.flags & V4L2_BUF_FLAG_TIMECODE)
244 memcpy(&out_vb->v4l2_buf.timecode, &in_vb->v4l2_buf.timecode,
245 sizeof(struct v4l2_timecode));
246 out_vb->v4l2_buf.field = in_vb->v4l2_buf.field;
247 out_vb->v4l2_buf.flags = in_vb->v4l2_buf.flags &
248 (V4L2_BUF_FLAG_TIMECODE |
249 V4L2_BUF_FLAG_KEYFRAME |
250 V4L2_BUF_FLAG_PFRAME |
251 V4L2_BUF_FLAG_BFRAME |
252 V4L2_BUF_FLAG_TSTAMP_SRC_MASK);
253
254 switch (ctx->mode) {
255 case MEM2MEM_HFLIP | MEM2MEM_VFLIP:
256 p_out += bytesperline * height - bytes_left;
257 for (y = 0; y < height; ++y) {
258 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
259 if (w & 0x1) {
260 for (x = 0; x < tile_w; ++x)
261 *--p_out = *p_in++ +
262 MEM2MEM_COLOR_STEP;
263 } else {
264 for (x = 0; x < tile_w; ++x)
265 *--p_out = *p_in++ -
266 MEM2MEM_COLOR_STEP;
267 }
268 ++w;
269 }
270 p_in += bytes_left;
271 p_out -= bytes_left;
272 }
273 break;
274
275 case MEM2MEM_HFLIP:
276 for (y = 0; y < height; ++y) {
277 p_out += MEM2MEM_NUM_TILES * tile_w;
278 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
279 if (w & 0x01) {
280 for (x = 0; x < tile_w; ++x)
281 *--p_out = *p_in++ +
282 MEM2MEM_COLOR_STEP;
283 } else {
284 for (x = 0; x < tile_w; ++x)
285 *--p_out = *p_in++ -
286 MEM2MEM_COLOR_STEP;
287 }
288 ++w;
289 }
290 p_in += bytes_left;
291 p_out += bytesperline;
292 }
293 break;
294
295 case MEM2MEM_VFLIP:
296 p_out += bytesperline * (height - 1);
297 for (y = 0; y < height; ++y) {
298 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
299 if (w & 0x1) {
300 for (x = 0; x < tile_w; ++x)
301 *p_out++ = *p_in++ +
302 MEM2MEM_COLOR_STEP;
303 } else {
304 for (x = 0; x < tile_w; ++x)
305 *p_out++ = *p_in++ -
306 MEM2MEM_COLOR_STEP;
307 }
308 ++w;
309 }
310 p_in += bytes_left;
311 p_out += bytes_left - 2 * bytesperline;
312 }
313 break;
314
315 default:
316 for (y = 0; y < height; ++y) {
317 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
318 if (w & 0x1) {
319 for (x = 0; x < tile_w; ++x)
320 *p_out++ = *p_in++ +
321 MEM2MEM_COLOR_STEP;
322 } else {
323 for (x = 0; x < tile_w; ++x)
324 *p_out++ = *p_in++ -
325 MEM2MEM_COLOR_STEP;
326 }
327 ++w;
328 }
329 p_in += bytes_left;
330 p_out += bytes_left;
331 }
332 }
333
334 return 0;
335 }
336
schedule_irq(struct m2mtest_dev * dev,int msec_timeout)337 static void schedule_irq(struct m2mtest_dev *dev, int msec_timeout)
338 {
339 dprintk(dev, "Scheduling a simulated irq\n");
340 mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout));
341 }
342
343 /*
344 * mem2mem callbacks
345 */
346
347 /**
348 * job_ready() - check whether an instance is ready to be scheduled to run
349 */
job_ready(void * priv)350 static int job_ready(void *priv)
351 {
352 struct m2mtest_ctx *ctx = priv;
353
354 if (v4l2_m2m_num_src_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen
355 || v4l2_m2m_num_dst_bufs_ready(ctx->fh.m2m_ctx) < ctx->translen) {
356 dprintk(ctx->dev, "Not enough buffers available\n");
357 return 0;
358 }
359
360 return 1;
361 }
362
job_abort(void * priv)363 static void job_abort(void *priv)
364 {
365 struct m2mtest_ctx *ctx = priv;
366
367 /* Will cancel the transaction in the next interrupt handler */
368 ctx->aborting = 1;
369 }
370
371 /* device_run() - prepares and starts the device
372 *
373 * This simulates all the immediate preparations required before starting
374 * a device. This will be called by the framework when it decides to schedule
375 * a particular instance.
376 */
device_run(void * priv)377 static void device_run(void *priv)
378 {
379 struct m2mtest_ctx *ctx = priv;
380 struct m2mtest_dev *dev = ctx->dev;
381 struct vb2_buffer *src_buf, *dst_buf;
382
383 src_buf = v4l2_m2m_next_src_buf(ctx->fh.m2m_ctx);
384 dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
385
386 device_process(ctx, src_buf, dst_buf);
387
388 /* Run a timer, which simulates a hardware irq */
389 schedule_irq(dev, ctx->transtime);
390 }
391
device_isr(unsigned long priv)392 static void device_isr(unsigned long priv)
393 {
394 struct m2mtest_dev *m2mtest_dev = (struct m2mtest_dev *)priv;
395 struct m2mtest_ctx *curr_ctx;
396 struct vb2_buffer *src_vb, *dst_vb;
397 unsigned long flags;
398
399 curr_ctx = v4l2_m2m_get_curr_priv(m2mtest_dev->m2m_dev);
400
401 if (NULL == curr_ctx) {
402 pr_err("Instance released before the end of transaction\n");
403 return;
404 }
405
406 src_vb = v4l2_m2m_src_buf_remove(curr_ctx->fh.m2m_ctx);
407 dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->fh.m2m_ctx);
408
409 curr_ctx->num_processed++;
410
411 spin_lock_irqsave(&m2mtest_dev->irqlock, flags);
412 v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
413 v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
414 spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags);
415
416 if (curr_ctx->num_processed == curr_ctx->translen
417 || curr_ctx->aborting) {
418 dprintk(curr_ctx->dev, "Finishing transaction\n");
419 curr_ctx->num_processed = 0;
420 v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->fh.m2m_ctx);
421 } else {
422 device_run(curr_ctx);
423 }
424 }
425
426 /*
427 * video ioctls
428 */
vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * cap)429 static int vidioc_querycap(struct file *file, void *priv,
430 struct v4l2_capability *cap)
431 {
432 strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
433 strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
434 snprintf(cap->bus_info, sizeof(cap->bus_info),
435 "platform:%s", MEM2MEM_NAME);
436 cap->device_caps = V4L2_CAP_VIDEO_M2M | V4L2_CAP_STREAMING;
437 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
438 return 0;
439 }
440
enum_fmt(struct v4l2_fmtdesc * f,u32 type)441 static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
442 {
443 int i, num;
444 struct m2mtest_fmt *fmt;
445
446 num = 0;
447
448 for (i = 0; i < NUM_FORMATS; ++i) {
449 if (formats[i].types & type) {
450 /* index-th format of type type found ? */
451 if (num == f->index)
452 break;
453 /* Correct type but haven't reached our index yet,
454 * just increment per-type index */
455 ++num;
456 }
457 }
458
459 if (i < NUM_FORMATS) {
460 /* Format found */
461 fmt = &formats[i];
462 strncpy(f->description, fmt->name, sizeof(f->description) - 1);
463 f->pixelformat = fmt->fourcc;
464 return 0;
465 }
466
467 /* Format not found */
468 return -EINVAL;
469 }
470
vidioc_enum_fmt_vid_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)471 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
472 struct v4l2_fmtdesc *f)
473 {
474 return enum_fmt(f, MEM2MEM_CAPTURE);
475 }
476
vidioc_enum_fmt_vid_out(struct file * file,void * priv,struct v4l2_fmtdesc * f)477 static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
478 struct v4l2_fmtdesc *f)
479 {
480 return enum_fmt(f, MEM2MEM_OUTPUT);
481 }
482
vidioc_g_fmt(struct m2mtest_ctx * ctx,struct v4l2_format * f)483 static int vidioc_g_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
484 {
485 struct vb2_queue *vq;
486 struct m2mtest_q_data *q_data;
487
488 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
489 if (!vq)
490 return -EINVAL;
491
492 q_data = get_q_data(ctx, f->type);
493
494 f->fmt.pix.width = q_data->width;
495 f->fmt.pix.height = q_data->height;
496 f->fmt.pix.field = V4L2_FIELD_NONE;
497 f->fmt.pix.pixelformat = q_data->fmt->fourcc;
498 f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
499 f->fmt.pix.sizeimage = q_data->sizeimage;
500 f->fmt.pix.colorspace = ctx->colorspace;
501
502 return 0;
503 }
504
vidioc_g_fmt_vid_out(struct file * file,void * priv,struct v4l2_format * f)505 static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
506 struct v4l2_format *f)
507 {
508 return vidioc_g_fmt(file2ctx(file), f);
509 }
510
vidioc_g_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)511 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
512 struct v4l2_format *f)
513 {
514 return vidioc_g_fmt(file2ctx(file), f);
515 }
516
vidioc_try_fmt(struct v4l2_format * f,struct m2mtest_fmt * fmt)517 static int vidioc_try_fmt(struct v4l2_format *f, struct m2mtest_fmt *fmt)
518 {
519 /* V4L2 specification suggests the driver corrects the format struct
520 * if any of the dimensions is unsupported */
521 if (f->fmt.pix.height < MIN_H)
522 f->fmt.pix.height = MIN_H;
523 else if (f->fmt.pix.height > MAX_H)
524 f->fmt.pix.height = MAX_H;
525
526 if (f->fmt.pix.width < MIN_W)
527 f->fmt.pix.width = MIN_W;
528 else if (f->fmt.pix.width > MAX_W)
529 f->fmt.pix.width = MAX_W;
530
531 f->fmt.pix.width &= ~DIM_ALIGN_MASK;
532 f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
533 f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
534 f->fmt.pix.field = V4L2_FIELD_NONE;
535
536 return 0;
537 }
538
vidioc_try_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)539 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
540 struct v4l2_format *f)
541 {
542 struct m2mtest_fmt *fmt;
543 struct m2mtest_ctx *ctx = file2ctx(file);
544
545 fmt = find_format(f);
546 if (!fmt) {
547 f->fmt.pix.pixelformat = formats[0].fourcc;
548 fmt = find_format(f);
549 }
550 if (!(fmt->types & MEM2MEM_CAPTURE)) {
551 v4l2_err(&ctx->dev->v4l2_dev,
552 "Fourcc format (0x%08x) invalid.\n",
553 f->fmt.pix.pixelformat);
554 return -EINVAL;
555 }
556 f->fmt.pix.colorspace = ctx->colorspace;
557
558 return vidioc_try_fmt(f, fmt);
559 }
560
vidioc_try_fmt_vid_out(struct file * file,void * priv,struct v4l2_format * f)561 static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
562 struct v4l2_format *f)
563 {
564 struct m2mtest_fmt *fmt;
565 struct m2mtest_ctx *ctx = file2ctx(file);
566
567 fmt = find_format(f);
568 if (!fmt) {
569 f->fmt.pix.pixelformat = formats[0].fourcc;
570 fmt = find_format(f);
571 }
572 if (!(fmt->types & MEM2MEM_OUTPUT)) {
573 v4l2_err(&ctx->dev->v4l2_dev,
574 "Fourcc format (0x%08x) invalid.\n",
575 f->fmt.pix.pixelformat);
576 return -EINVAL;
577 }
578 if (!f->fmt.pix.colorspace)
579 f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
580
581 return vidioc_try_fmt(f, fmt);
582 }
583
vidioc_s_fmt(struct m2mtest_ctx * ctx,struct v4l2_format * f)584 static int vidioc_s_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
585 {
586 struct m2mtest_q_data *q_data;
587 struct vb2_queue *vq;
588
589 vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
590 if (!vq)
591 return -EINVAL;
592
593 q_data = get_q_data(ctx, f->type);
594 if (!q_data)
595 return -EINVAL;
596
597 if (vb2_is_busy(vq)) {
598 v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
599 return -EBUSY;
600 }
601
602 q_data->fmt = find_format(f);
603 q_data->width = f->fmt.pix.width;
604 q_data->height = f->fmt.pix.height;
605 q_data->sizeimage = q_data->width * q_data->height
606 * q_data->fmt->depth >> 3;
607
608 dprintk(ctx->dev,
609 "Setting format for type %d, wxh: %dx%d, fmt: %d\n",
610 f->type, q_data->width, q_data->height, q_data->fmt->fourcc);
611
612 return 0;
613 }
614
vidioc_s_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)615 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
616 struct v4l2_format *f)
617 {
618 int ret;
619
620 ret = vidioc_try_fmt_vid_cap(file, priv, f);
621 if (ret)
622 return ret;
623
624 return vidioc_s_fmt(file2ctx(file), f);
625 }
626
vidioc_s_fmt_vid_out(struct file * file,void * priv,struct v4l2_format * f)627 static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
628 struct v4l2_format *f)
629 {
630 struct m2mtest_ctx *ctx = file2ctx(file);
631 int ret;
632
633 ret = vidioc_try_fmt_vid_out(file, priv, f);
634 if (ret)
635 return ret;
636
637 ret = vidioc_s_fmt(file2ctx(file), f);
638 if (!ret)
639 ctx->colorspace = f->fmt.pix.colorspace;
640 return ret;
641 }
642
m2mtest_s_ctrl(struct v4l2_ctrl * ctrl)643 static int m2mtest_s_ctrl(struct v4l2_ctrl *ctrl)
644 {
645 struct m2mtest_ctx *ctx =
646 container_of(ctrl->handler, struct m2mtest_ctx, hdl);
647
648 switch (ctrl->id) {
649 case V4L2_CID_HFLIP:
650 if (ctrl->val)
651 ctx->mode |= MEM2MEM_HFLIP;
652 else
653 ctx->mode &= ~MEM2MEM_HFLIP;
654 break;
655
656 case V4L2_CID_VFLIP:
657 if (ctrl->val)
658 ctx->mode |= MEM2MEM_VFLIP;
659 else
660 ctx->mode &= ~MEM2MEM_VFLIP;
661 break;
662
663 case V4L2_CID_TRANS_TIME_MSEC:
664 ctx->transtime = ctrl->val;
665 break;
666
667 case V4L2_CID_TRANS_NUM_BUFS:
668 ctx->translen = ctrl->val;
669 break;
670
671 default:
672 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
673 return -EINVAL;
674 }
675
676 return 0;
677 }
678
679 static const struct v4l2_ctrl_ops m2mtest_ctrl_ops = {
680 .s_ctrl = m2mtest_s_ctrl,
681 };
682
683
684 static const struct v4l2_ioctl_ops m2mtest_ioctl_ops = {
685 .vidioc_querycap = vidioc_querycap,
686
687 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
688 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
689 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
690 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
691
692 .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
693 .vidioc_g_fmt_vid_out = vidioc_g_fmt_vid_out,
694 .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out,
695 .vidioc_s_fmt_vid_out = vidioc_s_fmt_vid_out,
696
697 .vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs,
698 .vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
699 .vidioc_qbuf = v4l2_m2m_ioctl_qbuf,
700 .vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
701
702 .vidioc_streamon = v4l2_m2m_ioctl_streamon,
703 .vidioc_streamoff = v4l2_m2m_ioctl_streamoff,
704
705 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
706 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
707 };
708
709
710 /*
711 * Queue operations
712 */
713
m2mtest_queue_setup(struct vb2_queue * vq,const struct v4l2_format * fmt,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],void * alloc_ctxs[])714 static int m2mtest_queue_setup(struct vb2_queue *vq,
715 const struct v4l2_format *fmt,
716 unsigned int *nbuffers, unsigned int *nplanes,
717 unsigned int sizes[], void *alloc_ctxs[])
718 {
719 struct m2mtest_ctx *ctx = vb2_get_drv_priv(vq);
720 struct m2mtest_q_data *q_data;
721 unsigned int size, count = *nbuffers;
722
723 q_data = get_q_data(ctx, vq->type);
724
725 size = q_data->width * q_data->height * q_data->fmt->depth >> 3;
726
727 while (size * count > MEM2MEM_VID_MEM_LIMIT)
728 (count)--;
729
730 *nplanes = 1;
731 *nbuffers = count;
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
m2mtest_buf_prepare(struct vb2_buffer * vb)744 static int m2mtest_buf_prepare(struct vb2_buffer *vb)
745 {
746 struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
747 struct m2mtest_q_data *q_data;
748
749 dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type);
750
751 q_data = get_q_data(ctx, vb->vb2_queue->type);
752 if (V4L2_TYPE_IS_OUTPUT(vb->vb2_queue->type)) {
753 if (vb->v4l2_buf.field == V4L2_FIELD_ANY)
754 vb->v4l2_buf.field = V4L2_FIELD_NONE;
755 if (vb->v4l2_buf.field != V4L2_FIELD_NONE) {
756 dprintk(ctx->dev, "%s field isn't supported\n",
757 __func__);
758 return -EINVAL;
759 }
760 }
761
762 if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
763 dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n",
764 __func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage);
765 return -EINVAL;
766 }
767
768 vb2_set_plane_payload(vb, 0, q_data->sizeimage);
769
770 return 0;
771 }
772
m2mtest_buf_queue(struct vb2_buffer * vb)773 static void m2mtest_buf_queue(struct vb2_buffer *vb)
774 {
775 struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
776
777 v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vb);
778 }
779
m2mtest_start_streaming(struct vb2_queue * q,unsigned count)780 static int m2mtest_start_streaming(struct vb2_queue *q, unsigned count)
781 {
782 struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
783 struct m2mtest_q_data *q_data = get_q_data(ctx, q->type);
784
785 q_data->sequence = 0;
786 return 0;
787 }
788
m2mtest_stop_streaming(struct vb2_queue * q)789 static void m2mtest_stop_streaming(struct vb2_queue *q)
790 {
791 struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
792 struct vb2_buffer *vb;
793 unsigned long flags;
794
795 for (;;) {
796 if (V4L2_TYPE_IS_OUTPUT(q->type))
797 vb = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
798 else
799 vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
800 if (vb == NULL)
801 return;
802 spin_lock_irqsave(&ctx->dev->irqlock, flags);
803 v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR);
804 spin_unlock_irqrestore(&ctx->dev->irqlock, flags);
805 }
806 }
807
808 static struct vb2_ops m2mtest_qops = {
809 .queue_setup = m2mtest_queue_setup,
810 .buf_prepare = m2mtest_buf_prepare,
811 .buf_queue = m2mtest_buf_queue,
812 .start_streaming = m2mtest_start_streaming,
813 .stop_streaming = m2mtest_stop_streaming,
814 .wait_prepare = vb2_ops_wait_prepare,
815 .wait_finish = vb2_ops_wait_finish,
816 };
817
queue_init(void * priv,struct vb2_queue * src_vq,struct vb2_queue * dst_vq)818 static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
819 {
820 struct m2mtest_ctx *ctx = priv;
821 int ret;
822
823 src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
824 src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
825 src_vq->drv_priv = ctx;
826 src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
827 src_vq->ops = &m2mtest_qops;
828 src_vq->mem_ops = &vb2_vmalloc_memops;
829 src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
830 src_vq->lock = &ctx->dev->dev_mutex;
831
832 ret = vb2_queue_init(src_vq);
833 if (ret)
834 return ret;
835
836 dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
837 dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
838 dst_vq->drv_priv = ctx;
839 dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
840 dst_vq->ops = &m2mtest_qops;
841 dst_vq->mem_ops = &vb2_vmalloc_memops;
842 dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
843 dst_vq->lock = &ctx->dev->dev_mutex;
844
845 return vb2_queue_init(dst_vq);
846 }
847
848 static const struct v4l2_ctrl_config m2mtest_ctrl_trans_time_msec = {
849 .ops = &m2mtest_ctrl_ops,
850 .id = V4L2_CID_TRANS_TIME_MSEC,
851 .name = "Transaction Time (msec)",
852 .type = V4L2_CTRL_TYPE_INTEGER,
853 .def = MEM2MEM_DEF_TRANSTIME,
854 .min = 1,
855 .max = 10001,
856 .step = 1,
857 };
858
859 static const struct v4l2_ctrl_config m2mtest_ctrl_trans_num_bufs = {
860 .ops = &m2mtest_ctrl_ops,
861 .id = V4L2_CID_TRANS_NUM_BUFS,
862 .name = "Buffers Per Transaction",
863 .type = V4L2_CTRL_TYPE_INTEGER,
864 .def = 1,
865 .min = 1,
866 .max = MEM2MEM_DEF_NUM_BUFS,
867 .step = 1,
868 };
869
870 /*
871 * File operations
872 */
m2mtest_open(struct file * file)873 static int m2mtest_open(struct file *file)
874 {
875 struct m2mtest_dev *dev = video_drvdata(file);
876 struct m2mtest_ctx *ctx = NULL;
877 struct v4l2_ctrl_handler *hdl;
878 int rc = 0;
879
880 if (mutex_lock_interruptible(&dev->dev_mutex))
881 return -ERESTARTSYS;
882 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
883 if (!ctx) {
884 rc = -ENOMEM;
885 goto open_unlock;
886 }
887
888 v4l2_fh_init(&ctx->fh, video_devdata(file));
889 file->private_data = &ctx->fh;
890 ctx->dev = dev;
891 hdl = &ctx->hdl;
892 v4l2_ctrl_handler_init(hdl, 4);
893 v4l2_ctrl_new_std(hdl, &m2mtest_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
894 v4l2_ctrl_new_std(hdl, &m2mtest_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
895 v4l2_ctrl_new_custom(hdl, &m2mtest_ctrl_trans_time_msec, NULL);
896 v4l2_ctrl_new_custom(hdl, &m2mtest_ctrl_trans_num_bufs, NULL);
897 if (hdl->error) {
898 rc = hdl->error;
899 v4l2_ctrl_handler_free(hdl);
900 goto open_unlock;
901 }
902 ctx->fh.ctrl_handler = hdl;
903 v4l2_ctrl_handler_setup(hdl);
904
905 ctx->q_data[V4L2_M2M_SRC].fmt = &formats[0];
906 ctx->q_data[V4L2_M2M_SRC].width = 640;
907 ctx->q_data[V4L2_M2M_SRC].height = 480;
908 ctx->q_data[V4L2_M2M_SRC].sizeimage =
909 ctx->q_data[V4L2_M2M_SRC].width *
910 ctx->q_data[V4L2_M2M_SRC].height *
911 (ctx->q_data[V4L2_M2M_SRC].fmt->depth >> 3);
912 ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC];
913 ctx->colorspace = V4L2_COLORSPACE_REC709;
914
915 ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
916
917 if (IS_ERR(ctx->fh.m2m_ctx)) {
918 rc = PTR_ERR(ctx->fh.m2m_ctx);
919
920 v4l2_ctrl_handler_free(hdl);
921 kfree(ctx);
922 goto open_unlock;
923 }
924
925 v4l2_fh_add(&ctx->fh);
926 atomic_inc(&dev->num_inst);
927
928 dprintk(dev, "Created instance: %p, m2m_ctx: %p\n",
929 ctx, ctx->fh.m2m_ctx);
930
931 open_unlock:
932 mutex_unlock(&dev->dev_mutex);
933 return rc;
934 }
935
m2mtest_release(struct file * file)936 static int m2mtest_release(struct file *file)
937 {
938 struct m2mtest_dev *dev = video_drvdata(file);
939 struct m2mtest_ctx *ctx = file2ctx(file);
940
941 dprintk(dev, "Releasing instance %p\n", ctx);
942
943 v4l2_fh_del(&ctx->fh);
944 v4l2_fh_exit(&ctx->fh);
945 v4l2_ctrl_handler_free(&ctx->hdl);
946 mutex_lock(&dev->dev_mutex);
947 v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
948 mutex_unlock(&dev->dev_mutex);
949 kfree(ctx);
950
951 atomic_dec(&dev->num_inst);
952
953 return 0;
954 }
955
956 static const struct v4l2_file_operations m2mtest_fops = {
957 .owner = THIS_MODULE,
958 .open = m2mtest_open,
959 .release = m2mtest_release,
960 .poll = v4l2_m2m_fop_poll,
961 .unlocked_ioctl = video_ioctl2,
962 .mmap = v4l2_m2m_fop_mmap,
963 };
964
965 static struct video_device m2mtest_videodev = {
966 .name = MEM2MEM_NAME,
967 .vfl_dir = VFL_DIR_M2M,
968 .fops = &m2mtest_fops,
969 .ioctl_ops = &m2mtest_ioctl_ops,
970 .minor = -1,
971 .release = video_device_release,
972 };
973
974 static struct v4l2_m2m_ops m2m_ops = {
975 .device_run = device_run,
976 .job_ready = job_ready,
977 .job_abort = job_abort,
978 };
979
m2mtest_probe(struct platform_device * pdev)980 static int m2mtest_probe(struct platform_device *pdev)
981 {
982 struct m2mtest_dev *dev;
983 struct video_device *vfd;
984 int ret;
985
986 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
987 if (!dev)
988 return -ENOMEM;
989
990 spin_lock_init(&dev->irqlock);
991
992 ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
993 if (ret)
994 return ret;
995
996 atomic_set(&dev->num_inst, 0);
997 mutex_init(&dev->dev_mutex);
998
999 vfd = video_device_alloc();
1000 if (!vfd) {
1001 v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
1002 ret = -ENOMEM;
1003 goto unreg_dev;
1004 }
1005
1006 *vfd = m2mtest_videodev;
1007 vfd->lock = &dev->dev_mutex;
1008 vfd->v4l2_dev = &dev->v4l2_dev;
1009
1010 ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
1011 if (ret) {
1012 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
1013 goto rel_vdev;
1014 }
1015
1016 video_set_drvdata(vfd, dev);
1017 snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name);
1018 dev->vfd = vfd;
1019 v4l2_info(&dev->v4l2_dev,
1020 "Device registered as /dev/video%d\n", vfd->num);
1021
1022 setup_timer(&dev->timer, device_isr, (long)dev);
1023 platform_set_drvdata(pdev, dev);
1024
1025 dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
1026 if (IS_ERR(dev->m2m_dev)) {
1027 v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
1028 ret = PTR_ERR(dev->m2m_dev);
1029 goto err_m2m;
1030 }
1031
1032 return 0;
1033
1034 err_m2m:
1035 v4l2_m2m_release(dev->m2m_dev);
1036 video_unregister_device(dev->vfd);
1037 rel_vdev:
1038 video_device_release(vfd);
1039 unreg_dev:
1040 v4l2_device_unregister(&dev->v4l2_dev);
1041
1042 return ret;
1043 }
1044
m2mtest_remove(struct platform_device * pdev)1045 static int m2mtest_remove(struct platform_device *pdev)
1046 {
1047 struct m2mtest_dev *dev = platform_get_drvdata(pdev);
1048
1049 v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME);
1050 v4l2_m2m_release(dev->m2m_dev);
1051 del_timer_sync(&dev->timer);
1052 video_unregister_device(dev->vfd);
1053 v4l2_device_unregister(&dev->v4l2_dev);
1054
1055 return 0;
1056 }
1057
1058 static struct platform_driver m2mtest_pdrv = {
1059 .probe = m2mtest_probe,
1060 .remove = m2mtest_remove,
1061 .driver = {
1062 .name = MEM2MEM_NAME,
1063 .owner = THIS_MODULE,
1064 },
1065 };
1066
m2mtest_exit(void)1067 static void __exit m2mtest_exit(void)
1068 {
1069 platform_driver_unregister(&m2mtest_pdrv);
1070 platform_device_unregister(&m2mtest_pdev);
1071 }
1072
m2mtest_init(void)1073 static int __init m2mtest_init(void)
1074 {
1075 int ret;
1076
1077 ret = platform_device_register(&m2mtest_pdev);
1078 if (ret)
1079 return ret;
1080
1081 ret = platform_driver_register(&m2mtest_pdrv);
1082 if (ret)
1083 platform_device_unregister(&m2mtest_pdev);
1084
1085 return 0;
1086 }
1087
1088 module_init(m2mtest_init);
1089 module_exit(m2mtest_exit);
1090