Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/media/platform/mem2mem_testdev.c

  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 
 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 
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 
183 static inline struct m2mtest_ctx *file2ctx(struct file *file)
184 {
185         return container_of(file->private_data, struct m2mtest_ctx, fh);
186 }
187 
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 
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 
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  */
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 
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  */
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 
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  */
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 
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 
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 
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 
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 
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 
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 
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         f->fmt.pix.priv = 0;
536 
537         return 0;
538 }
539 
540 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
541                                   struct v4l2_format *f)
542 {
543         struct m2mtest_fmt *fmt;
544         struct m2mtest_ctx *ctx = file2ctx(file);
545 
546         fmt = find_format(f);
547         if (!fmt) {
548                 f->fmt.pix.pixelformat = formats[0].fourcc;
549                 fmt = find_format(f);
550         }
551         if (!(fmt->types & MEM2MEM_CAPTURE)) {
552                 v4l2_err(&ctx->dev->v4l2_dev,
553                          "Fourcc format (0x%08x) invalid.\n",
554                          f->fmt.pix.pixelformat);
555                 return -EINVAL;
556         }
557         f->fmt.pix.colorspace = ctx->colorspace;
558 
559         return vidioc_try_fmt(f, fmt);
560 }
561 
562 static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
563                                   struct v4l2_format *f)
564 {
565         struct m2mtest_fmt *fmt;
566         struct m2mtest_ctx *ctx = file2ctx(file);
567 
568         fmt = find_format(f);
569         if (!fmt) {
570                 f->fmt.pix.pixelformat = formats[0].fourcc;
571                 fmt = find_format(f);
572         }
573         if (!(fmt->types & MEM2MEM_OUTPUT)) {
574                 v4l2_err(&ctx->dev->v4l2_dev,
575                          "Fourcc format (0x%08x) invalid.\n",
576                          f->fmt.pix.pixelformat);
577                 return -EINVAL;
578         }
579         if (!f->fmt.pix.colorspace)
580                 f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
581 
582         return vidioc_try_fmt(f, fmt);
583 }
584 
585 static int vidioc_s_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
586 {
587         struct m2mtest_q_data *q_data;
588         struct vb2_queue *vq;
589 
590         vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, f->type);
591         if (!vq)
592                 return -EINVAL;
593 
594         q_data = get_q_data(ctx, f->type);
595         if (!q_data)
596                 return -EINVAL;
597 
598         if (vb2_is_busy(vq)) {
599                 v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
600                 return -EBUSY;
601         }
602 
603         q_data->fmt             = find_format(f);
604         q_data->width           = f->fmt.pix.width;
605         q_data->height          = f->fmt.pix.height;
606         q_data->sizeimage       = q_data->width * q_data->height
607                                 * q_data->fmt->depth >> 3;
608 
609         dprintk(ctx->dev,
610                 "Setting format for type %d, wxh: %dx%d, fmt: %d\n",
611                 f->type, q_data->width, q_data->height, q_data->fmt->fourcc);
612 
613         return 0;
614 }
615 
616 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
617                                 struct v4l2_format *f)
618 {
619         int ret;
620 
621         ret = vidioc_try_fmt_vid_cap(file, priv, f);
622         if (ret)
623                 return ret;
624 
625         return vidioc_s_fmt(file2ctx(file), f);
626 }
627 
628 static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
629                                 struct v4l2_format *f)
630 {
631         struct m2mtest_ctx *ctx = file2ctx(file);
632         int ret;
633 
634         ret = vidioc_try_fmt_vid_out(file, priv, f);
635         if (ret)
636                 return ret;
637 
638         ret = vidioc_s_fmt(file2ctx(file), f);
639         if (!ret)
640                 ctx->colorspace = f->fmt.pix.colorspace;
641         return ret;
642 }
643 
644 static int m2mtest_s_ctrl(struct v4l2_ctrl *ctrl)
645 {
646         struct m2mtest_ctx *ctx =
647                 container_of(ctrl->handler, struct m2mtest_ctx, hdl);
648 
649         switch (ctrl->id) {
650         case V4L2_CID_HFLIP:
651                 if (ctrl->val)
652                         ctx->mode |= MEM2MEM_HFLIP;
653                 else
654                         ctx->mode &= ~MEM2MEM_HFLIP;
655                 break;
656 
657         case V4L2_CID_VFLIP:
658                 if (ctrl->val)
659                         ctx->mode |= MEM2MEM_VFLIP;
660                 else
661                         ctx->mode &= ~MEM2MEM_VFLIP;
662                 break;
663 
664         case V4L2_CID_TRANS_TIME_MSEC:
665                 ctx->transtime = ctrl->val;
666                 break;
667 
668         case V4L2_CID_TRANS_NUM_BUFS:
669                 ctx->translen = ctrl->val;
670                 break;
671 
672         default:
673                 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
674                 return -EINVAL;
675         }
676 
677         return 0;
678 }
679 
680 static const struct v4l2_ctrl_ops m2mtest_ctrl_ops = {
681         .s_ctrl = m2mtest_s_ctrl,
682 };
683 
684 
685 static const struct v4l2_ioctl_ops m2mtest_ioctl_ops = {
686         .vidioc_querycap        = vidioc_querycap,
687 
688         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
689         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
690         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
691         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
692 
693         .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
694         .vidioc_g_fmt_vid_out   = vidioc_g_fmt_vid_out,
695         .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out,
696         .vidioc_s_fmt_vid_out   = vidioc_s_fmt_vid_out,
697 
698         .vidioc_reqbufs         = v4l2_m2m_ioctl_reqbufs,
699         .vidioc_querybuf        = v4l2_m2m_ioctl_querybuf,
700         .vidioc_qbuf            = v4l2_m2m_ioctl_qbuf,
701         .vidioc_dqbuf           = v4l2_m2m_ioctl_dqbuf,
702 
703         .vidioc_streamon        = v4l2_m2m_ioctl_streamon,
704         .vidioc_streamoff       = v4l2_m2m_ioctl_streamoff,
705 
706         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
707         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
708 };
709 
710 
711 /*
712  * Queue operations
713  */
714 
715 static int m2mtest_queue_setup(struct vb2_queue *vq,
716                                 const struct v4l2_format *fmt,
717                                 unsigned int *nbuffers, unsigned int *nplanes,
718                                 unsigned int sizes[], void *alloc_ctxs[])
719 {
720         struct m2mtest_ctx *ctx = vb2_get_drv_priv(vq);
721         struct m2mtest_q_data *q_data;
722         unsigned int size, count = *nbuffers;
723 
724         q_data = get_q_data(ctx, vq->type);
725 
726         size = q_data->width * q_data->height * q_data->fmt->depth >> 3;
727 
728         while (size * count > MEM2MEM_VID_MEM_LIMIT)
729                 (count)--;
730 
731         *nplanes = 1;
732         *nbuffers = count;
733         sizes[0] = size;
734 
735         /*
736          * videobuf2-vmalloc allocator is context-less so no need to set
737          * alloc_ctxs array.
738          */
739 
740         dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size);
741 
742         return 0;
743 }
744 
745 static int m2mtest_buf_prepare(struct vb2_buffer *vb)
746 {
747         struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
748         struct m2mtest_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 (vb->v4l2_buf.field == V4L2_FIELD_ANY)
755                         vb->v4l2_buf.field = V4L2_FIELD_NONE;
756                 if (vb->v4l2_buf.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 m2mtest_buf_queue(struct vb2_buffer *vb)
775 {
776         struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
777 
778         v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vb);
779 }
780 
781 static int m2mtest_start_streaming(struct vb2_queue *q, unsigned count)
782 {
783         struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
784         struct m2mtest_q_data *q_data = get_q_data(ctx, q->type);
785 
786         q_data->sequence = 0;
787         return 0;
788 }
789 
790 static void m2mtest_stop_streaming(struct vb2_queue *q)
791 {
792         struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
793         struct vb2_buffer *vb;
794         unsigned long flags;
795 
796         for (;;) {
797                 if (V4L2_TYPE_IS_OUTPUT(q->type))
798                         vb = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
799                 else
800                         vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
801                 if (vb == NULL)
802                         return;
803                 spin_lock_irqsave(&ctx->dev->irqlock, flags);
804                 v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR);
805                 spin_unlock_irqrestore(&ctx->dev->irqlock, flags);
806         }
807 }
808 
809 static struct vb2_ops m2mtest_qops = {
810         .queue_setup     = m2mtest_queue_setup,
811         .buf_prepare     = m2mtest_buf_prepare,
812         .buf_queue       = m2mtest_buf_queue,
813         .start_streaming = m2mtest_start_streaming,
814         .stop_streaming  = m2mtest_stop_streaming,
815         .wait_prepare    = vb2_ops_wait_prepare,
816         .wait_finish     = vb2_ops_wait_finish,
817 };
818 
819 static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
820 {
821         struct m2mtest_ctx *ctx = priv;
822         int ret;
823 
824         src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
825         src_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
826         src_vq->drv_priv = ctx;
827         src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
828         src_vq->ops = &m2mtest_qops;
829         src_vq->mem_ops = &vb2_vmalloc_memops;
830         src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
831         src_vq->lock = &ctx->dev->dev_mutex;
832 
833         ret = vb2_queue_init(src_vq);
834         if (ret)
835                 return ret;
836 
837         dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
838         dst_vq->io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
839         dst_vq->drv_priv = ctx;
840         dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
841         dst_vq->ops = &m2mtest_qops;
842         dst_vq->mem_ops = &vb2_vmalloc_memops;
843         dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
844         dst_vq->lock = &ctx->dev->dev_mutex;
845 
846         return vb2_queue_init(dst_vq);
847 }
848 
849 static const struct v4l2_ctrl_config m2mtest_ctrl_trans_time_msec = {
850         .ops = &m2mtest_ctrl_ops,
851         .id = V4L2_CID_TRANS_TIME_MSEC,
852         .name = "Transaction Time (msec)",
853         .type = V4L2_CTRL_TYPE_INTEGER,
854         .def = MEM2MEM_DEF_TRANSTIME,
855         .min = 1,
856         .max = 10001,
857         .step = 1,
858 };
859 
860 static const struct v4l2_ctrl_config m2mtest_ctrl_trans_num_bufs = {
861         .ops = &m2mtest_ctrl_ops,
862         .id = V4L2_CID_TRANS_NUM_BUFS,
863         .name = "Buffers Per Transaction",
864         .type = V4L2_CTRL_TYPE_INTEGER,
865         .def = 1,
866         .min = 1,
867         .max = MEM2MEM_DEF_NUM_BUFS,
868         .step = 1,
869 };
870 
871 /*
872  * File operations
873  */
874 static int m2mtest_open(struct file *file)
875 {
876         struct m2mtest_dev *dev = video_drvdata(file);
877         struct m2mtest_ctx *ctx = NULL;
878         struct v4l2_ctrl_handler *hdl;
879         int rc = 0;
880 
881         if (mutex_lock_interruptible(&dev->dev_mutex))
882                 return -ERESTARTSYS;
883         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
884         if (!ctx) {
885                 rc = -ENOMEM;
886                 goto open_unlock;
887         }
888 
889         v4l2_fh_init(&ctx->fh, video_devdata(file));
890         file->private_data = &ctx->fh;
891         ctx->dev = dev;
892         hdl = &ctx->hdl;
893         v4l2_ctrl_handler_init(hdl, 4);
894         v4l2_ctrl_new_std(hdl, &m2mtest_ctrl_ops, V4L2_CID_HFLIP, 0, 1, 1, 0);
895         v4l2_ctrl_new_std(hdl, &m2mtest_ctrl_ops, V4L2_CID_VFLIP, 0, 1, 1, 0);
896         v4l2_ctrl_new_custom(hdl, &m2mtest_ctrl_trans_time_msec, NULL);
897         v4l2_ctrl_new_custom(hdl, &m2mtest_ctrl_trans_num_bufs, NULL);
898         if (hdl->error) {
899                 rc = hdl->error;
900                 v4l2_ctrl_handler_free(hdl);
901                 goto open_unlock;
902         }
903         ctx->fh.ctrl_handler = hdl;
904         v4l2_ctrl_handler_setup(hdl);
905 
906         ctx->q_data[V4L2_M2M_SRC].fmt = &formats[0];
907         ctx->q_data[V4L2_M2M_SRC].width = 640;
908         ctx->q_data[V4L2_M2M_SRC].height = 480;
909         ctx->q_data[V4L2_M2M_SRC].sizeimage =
910                 ctx->q_data[V4L2_M2M_SRC].width *
911                 ctx->q_data[V4L2_M2M_SRC].height *
912                 (ctx->q_data[V4L2_M2M_SRC].fmt->depth >> 3);
913         ctx->q_data[V4L2_M2M_DST] = ctx->q_data[V4L2_M2M_SRC];
914         ctx->colorspace = V4L2_COLORSPACE_REC709;
915 
916         ctx->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
917 
918         if (IS_ERR(ctx->fh.m2m_ctx)) {
919                 rc = PTR_ERR(ctx->fh.m2m_ctx);
920 
921                 v4l2_ctrl_handler_free(hdl);
922                 kfree(ctx);
923                 goto open_unlock;
924         }
925 
926         v4l2_fh_add(&ctx->fh);
927         atomic_inc(&dev->num_inst);
928 
929         dprintk(dev, "Created instance: %p, m2m_ctx: %p\n",
930                 ctx, ctx->fh.m2m_ctx);
931 
932 open_unlock:
933         mutex_unlock(&dev->dev_mutex);
934         return rc;
935 }
936 
937 static int m2mtest_release(struct file *file)
938 {
939         struct m2mtest_dev *dev = video_drvdata(file);
940         struct m2mtest_ctx *ctx = file2ctx(file);
941 
942         dprintk(dev, "Releasing instance %p\n", ctx);
943 
944         v4l2_fh_del(&ctx->fh);
945         v4l2_fh_exit(&ctx->fh);
946         v4l2_ctrl_handler_free(&ctx->hdl);
947         mutex_lock(&dev->dev_mutex);
948         v4l2_m2m_ctx_release(ctx->fh.m2m_ctx);
949         mutex_unlock(&dev->dev_mutex);
950         kfree(ctx);
951 
952         atomic_dec(&dev->num_inst);
953 
954         return 0;
955 }
956 
957 static const struct v4l2_file_operations m2mtest_fops = {
958         .owner          = THIS_MODULE,
959         .open           = m2mtest_open,
960         .release        = m2mtest_release,
961         .poll           = v4l2_m2m_fop_poll,
962         .unlocked_ioctl = video_ioctl2,
963         .mmap           = v4l2_m2m_fop_mmap,
964 };
965 
966 static struct video_device m2mtest_videodev = {
967         .name           = MEM2MEM_NAME,
968         .vfl_dir        = VFL_DIR_M2M,
969         .fops           = &m2mtest_fops,
970         .ioctl_ops      = &m2mtest_ioctl_ops,
971         .minor          = -1,
972         .release        = video_device_release,
973 };
974 
975 static struct v4l2_m2m_ops m2m_ops = {
976         .device_run     = device_run,
977         .job_ready      = job_ready,
978         .job_abort      = job_abort,
979 };
980 
981 static int m2mtest_probe(struct platform_device *pdev)
982 {
983         struct m2mtest_dev *dev;
984         struct video_device *vfd;
985         int ret;
986 
987         dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
988         if (!dev)
989                 return -ENOMEM;
990 
991         spin_lock_init(&dev->irqlock);
992 
993         ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
994         if (ret)
995                 return ret;
996 
997         atomic_set(&dev->num_inst, 0);
998         mutex_init(&dev->dev_mutex);
999 
1000         vfd = video_device_alloc();
1001         if (!vfd) {
1002                 v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
1003                 ret = -ENOMEM;
1004                 goto unreg_dev;
1005         }
1006 
1007         *vfd = m2mtest_videodev;
1008         vfd->lock = &dev->dev_mutex;
1009         vfd->v4l2_dev = &dev->v4l2_dev;
1010 
1011         ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
1012         if (ret) {
1013                 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
1014                 goto rel_vdev;
1015         }
1016 
1017         video_set_drvdata(vfd, dev);
1018         snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name);
1019         dev->vfd = vfd;
1020         v4l2_info(&dev->v4l2_dev,
1021                         "Device registered as /dev/video%d\n", vfd->num);
1022 
1023         setup_timer(&dev->timer, device_isr, (long)dev);
1024         platform_set_drvdata(pdev, dev);
1025 
1026         dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
1027         if (IS_ERR(dev->m2m_dev)) {
1028                 v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
1029                 ret = PTR_ERR(dev->m2m_dev);
1030                 goto err_m2m;
1031         }
1032 
1033         return 0;
1034 
1035 err_m2m:
1036         v4l2_m2m_release(dev->m2m_dev);
1037         video_unregister_device(dev->vfd);
1038 rel_vdev:
1039         video_device_release(vfd);
1040 unreg_dev:
1041         v4l2_device_unregister(&dev->v4l2_dev);
1042 
1043         return ret;
1044 }
1045 
1046 static int m2mtest_remove(struct platform_device *pdev)
1047 {
1048         struct m2mtest_dev *dev = platform_get_drvdata(pdev);
1049 
1050         v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME);
1051         v4l2_m2m_release(dev->m2m_dev);
1052         del_timer_sync(&dev->timer);
1053         video_unregister_device(dev->vfd);
1054         v4l2_device_unregister(&dev->v4l2_dev);
1055 
1056         return 0;
1057 }
1058 
1059 static struct platform_driver m2mtest_pdrv = {
1060         .probe          = m2mtest_probe,
1061         .remove         = m2mtest_remove,
1062         .driver         = {
1063                 .name   = MEM2MEM_NAME,
1064                 .owner  = THIS_MODULE,
1065         },
1066 };
1067 
1068 static void __exit m2mtest_exit(void)
1069 {
1070         platform_driver_unregister(&m2mtest_pdrv);
1071         platform_device_unregister(&m2mtest_pdev);
1072 }
1073 
1074 static int __init m2mtest_init(void)
1075 {
1076         int ret;
1077 
1078         ret = platform_device_register(&m2mtest_pdev);
1079         if (ret)
1080                 return ret;
1081 
1082         ret = platform_driver_register(&m2mtest_pdrv);
1083         if (ret)
1084                 platform_device_unregister(&m2mtest_pdev);
1085 
1086         return 0;
1087 }
1088 
1089 module_init(m2mtest_init);
1090 module_exit(m2mtest_exit);
1091 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us