Version:  2.0.40 2.2.26 2.4.37 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 3.17 3.18

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 
536         return 0;
537 }
538 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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  */
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 
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 
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 
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 
1067 static void __exit m2mtest_exit(void)
1068 {
1069         platform_driver_unregister(&m2mtest_pdrv);
1070         platform_device_unregister(&m2mtest_pdev);
1071 }
1072 
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 

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