drivers/media/video/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/videobuf2-vmalloc.h>
  31
  32 #define MEM2MEM_TEST_MODULE_NAME "mem2mem-testdev"
  33
  34 MODULE_DESCRIPTION("Virtual device for mem2mem framework testing");
  35 MODULE_AUTHOR("Pawel Osciak, <pawel@osciak.com>");
  36 MODULE_LICENSE("GPL");
  37 MODULE_VERSION("0.1.1");
  38
  39 #define MIN_W 32
  40 #define MIN_H 32
  41 #define MAX_W 640
  42 #define MAX_H 480
  43 #define DIM_ALIGN_MASK 7 /* 8-byte alignment for line length */
  44
  45 /* Flags that indicate a format can be used for capture/output */
  46 #define MEM2MEM_CAPTURE (1 << 0)
  47 #define MEM2MEM_OUTPUT  (1 << 1)
  48
  49 #define MEM2MEM_NAME            "m2m-testdev"
  50
  51 /* Per queue */
  52 #define MEM2MEM_DEF_NUM_BUFS    VIDEO_MAX_FRAME
  53 /* In bytes, per queue */
  54 #define MEM2MEM_VID_MEM_LIMIT   (16 * 1024 * 1024)
  55
  56 /* Default transaction time in msec */
  57 #define MEM2MEM_DEF_TRANSTIME   1000
  58 /* Default number of buffers per transaction */
  59 #define MEM2MEM_DEF_TRANSLEN    1
  60 #define MEM2MEM_COLOR_STEP      (0xff >> 4)
  61 #define MEM2MEM_NUM_TILES       8
  62
  63 #define dprintk(dev, fmt, arg...) \
  64         v4l2_dbg(1, 1, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)
  65
  66
  67 void m2mtest_dev_release(struct device *dev)
  68 {}
  69
  70 static struct platform_device m2mtest_pdev = {
  71         .name           = MEM2MEM_NAME,
  72         .dev.release    = m2mtest_dev_release,
  73 };
  74
  75 struct m2mtest_fmt {
  76         char    *name;
  77         u32     fourcc;
  78         int     depth;
  79         /* Types the format can be used for */
  80         u32     types;
  81 };
  82
  83 static struct m2mtest_fmt formats[] = {
  84         {
  85                 .name   = "RGB565 (BE)",
  86                 .fourcc = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */
  87                 .depth  = 16,
  88                 /* Both capture and output format */
  89                 .types  = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
  90         },
  91         {
  92                 .name   = "4:2:2, packed, YUYV",
  93                 .fourcc = V4L2_PIX_FMT_YUYV,
  94                 .depth  = 16,
  95                 /* Output-only format */
  96                 .types  = MEM2MEM_OUTPUT,
  97         },
  98 };
  99
 100 /* Per-queue, driver-specific private data */
 101 struct m2mtest_q_data {
 102         unsigned int            width;
 103         unsigned int            height;
 104         unsigned int            sizeimage;
 105         struct m2mtest_fmt      *fmt;
 106 };
 107
 108 enum {
 109         V4L2_M2M_SRC = 0,
 110         V4L2_M2M_DST = 1,
 111 };
 112
 113 #define V4L2_CID_TRANS_TIME_MSEC        V4L2_CID_PRIVATE_BASE
 114 #define V4L2_CID_TRANS_NUM_BUFS         (V4L2_CID_PRIVATE_BASE + 1)
 115
 116 static struct v4l2_queryctrl m2mtest_ctrls[] = {
 117         {
 118                 .id             = V4L2_CID_TRANS_TIME_MSEC,
 119                 .type           = V4L2_CTRL_TYPE_INTEGER,
 120                 .name           = "Transaction time (msec)",
 121                 .minimum        = 1,
 122                 .maximum        = 10000,
 123                 .step           = 100,
 124                 .default_value  = 1000,
 125                 .flags          = 0,
 126         }, {
 127                 .id             = V4L2_CID_TRANS_NUM_BUFS,
 128                 .type           = V4L2_CTRL_TYPE_INTEGER,
 129                 .name           = "Buffers per transaction",
 130                 .minimum        = 1,
 131                 .maximum        = MEM2MEM_DEF_NUM_BUFS,
 132                 .step           = 1,
 133                 .default_value  = 1,
 134                 .flags          = 0,
 135         },
 136 };
 137
 138 #define NUM_FORMATS ARRAY_SIZE(formats)
 139
 140 static struct m2mtest_fmt *find_format(struct v4l2_format *f)
 141 {
 142         struct m2mtest_fmt *fmt;
 143         unsigned int k;
 144
 145         for (k = 0; k < NUM_FORMATS; k++) {
 146                 fmt = &formats[k];
 147                 if (fmt->fourcc == f->fmt.pix.pixelformat)
 148                         break;
 149         }
 150
 151         if (k == NUM_FORMATS)
 152                 return NULL;
 153
 154         return &formats[k];
 155 }
 156
 157 struct m2mtest_dev {
 158         struct v4l2_device      v4l2_dev;
 159         struct video_device     *vfd;
 160
 161         atomic_t                num_inst;
 162         struct mutex            dev_mutex;
 163         spinlock_t              irqlock;
 164
 165         struct timer_list       timer;
 166
 167         struct v4l2_m2m_dev     *m2m_dev;
 168 };
 169
 170 struct m2mtest_ctx {
 171         struct m2mtest_dev      *dev;
 172
 173         /* Processed buffers in this transaction */
 174         u8                      num_processed;
 175
 176         /* Transaction length (i.e. how many buffers per transaction) */
 177         u32                     translen;
 178         /* Transaction time (i.e. simulated processing time) in milliseconds */
 179         u32                     transtime;
 180
 181         /* Abort requested by m2m */
 182         int                     aborting;
 183
 184         struct v4l2_m2m_ctx     *m2m_ctx;
 185
 186         /* Source and destination queue data */
 187         struct m2mtest_q_data   q_data[2];
 188 };
 189
 190 static struct m2mtest_q_data *get_q_data(struct m2mtest_ctx *ctx,
 191                                          enum v4l2_buf_type type)
 192 {
 193         switch (type) {
 194         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 195                 return &ctx->q_data[V4L2_M2M_SRC];
 196         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 197                 return &ctx->q_data[V4L2_M2M_DST];
 198         default:
 199                 BUG();
 200         }
 201         return NULL;
 202 }
 203
 204
 205 static struct v4l2_queryctrl *get_ctrl(int id)
 206 {
 207         int i;
 208
 209         for (i = 0; i < ARRAY_SIZE(m2mtest_ctrls); ++i) {
 210                 if (id == m2mtest_ctrls[i].id)
 211                         return &m2mtest_ctrls[i];
 212         }
 213
 214         return NULL;
 215 }
 216
 217 static int device_process(struct m2mtest_ctx *ctx,
 218                           struct vb2_buffer *in_vb,
 219                           struct vb2_buffer *out_vb)
 220 {
 221         struct m2mtest_dev *dev = ctx->dev;
 222         struct m2mtest_q_data *q_data;
 223         u8 *p_in, *p_out;
 224         int x, y, t, w;
 225         int tile_w, bytes_left;
 226         int width, height, bytesperline;
 227
 228         q_data = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
 229
 230         width   = q_data->width;
 231         height  = q_data->height;
 232         bytesperline    = (q_data->width * q_data->fmt->depth) >> 3;
 233
 234         p_in = vb2_plane_vaddr(in_vb, 0);
 235         p_out = vb2_plane_vaddr(out_vb, 0);
 236         if (!p_in || !p_out) {
 237                 v4l2_err(&dev->v4l2_dev,
 238                          "Acquiring kernel pointers to buffers failed\n");
 239                 return -EFAULT;
 240         }
 241
 242         if (vb2_plane_size(in_vb, 0) > vb2_plane_size(out_vb, 0)) {
 243                 v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n");
 244                 return -EINVAL;
 245         }
 246
 247         tile_w = (width * (q_data[V4L2_M2M_DST].fmt->depth >> 3))
 248                 / MEM2MEM_NUM_TILES;
 249         bytes_left = bytesperline - tile_w * MEM2MEM_NUM_TILES;
 250         w = 0;
 251
 252         for (y = 0; y < height; ++y) {
 253                 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
 254                         if (w & 0x1) {
 255                                 for (x = 0; x < tile_w; ++x)
 256                                         *p_out++ = *p_in++ + MEM2MEM_COLOR_STEP;
 257                         } else {
 258                                 for (x = 0; x < tile_w; ++x)
 259                                         *p_out++ = *p_in++ - MEM2MEM_COLOR_STEP;
 260                         }
 261                         ++w;
 262                 }
 263                 p_in += bytes_left;
 264                 p_out += bytes_left;
 265         }
 266
 267         return 0;
 268 }
 269
 270 static void schedule_irq(struct m2mtest_dev *dev, int msec_timeout)
 271 {
 272         dprintk(dev, "Scheduling a simulated irq\n");
 273         mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout));
 274 }
 275
 276 /*
 277  * mem2mem callbacks
 278  */
 279
 280 /**
 281  * job_ready() - check whether an instance is ready to be scheduled to run
 282  */
 283 static int job_ready(void *priv)
 284 {
 285         struct m2mtest_ctx *ctx = priv;
 286
 287         if (v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) < ctx->translen
 288             || v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx) < ctx->translen) {
 289                 dprintk(ctx->dev, "Not enough buffers available\n");
 290                 return 0;
 291         }
 292
 293         return 1;
 294 }
 295
 296 static void job_abort(void *priv)
 297 {
 298         struct m2mtest_ctx *ctx = priv;
 299
 300         /* Will cancel the transaction in the next interrupt handler */
 301         ctx->aborting = 1;
 302 }
 303
 304 static void m2mtest_lock(void *priv)
 305 {
 306         struct m2mtest_ctx *ctx = priv;
 307         struct m2mtest_dev *dev = ctx->dev;
 308         mutex_lock(&dev->dev_mutex);
 309 }
 310
 311 static void m2mtest_unlock(void *priv)
 312 {
 313         struct m2mtest_ctx *ctx = priv;
 314         struct m2mtest_dev *dev = ctx->dev;
 315         mutex_unlock(&dev->dev_mutex);
 316 }
 317
 318
 319 /* device_run() - prepares and starts the device
 320  *
 321  * This simulates all the immediate preparations required before starting
 322  * a device. This will be called by the framework when it decides to schedule
 323  * a particular instance.
 324  */
 325 static void device_run(void *priv)
 326 {
 327         struct m2mtest_ctx *ctx = priv;
 328         struct m2mtest_dev *dev = ctx->dev;
 329         struct vb2_buffer *src_buf, *dst_buf;
 330
 331         src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
 332         dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
 333
 334         device_process(ctx, src_buf, dst_buf);
 335
 336         /* Run a timer, which simulates a hardware irq  */
 337         schedule_irq(dev, ctx->transtime);
 338 }
 339
 340 static void device_isr(unsigned long priv)
 341 {
 342         struct m2mtest_dev *m2mtest_dev = (struct m2mtest_dev *)priv;
 343         struct m2mtest_ctx *curr_ctx;
 344         struct vb2_buffer *src_vb, *dst_vb;
 345         unsigned long flags;
 346
 347         curr_ctx = v4l2_m2m_get_curr_priv(m2mtest_dev->m2m_dev);
 348
 349         if (NULL == curr_ctx) {
 350                 printk(KERN_ERR
 351                         "Instance released before the end of transaction\n");
 352                 return;
 353         }
 354
 355         src_vb = v4l2_m2m_src_buf_remove(curr_ctx->m2m_ctx);
 356         dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->m2m_ctx);
 357
 358         curr_ctx->num_processed++;
 359
 360         spin_lock_irqsave(&m2mtest_dev->irqlock, flags);
 361         v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
 362         v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
 363         spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags);
 364
 365         if (curr_ctx->num_processed == curr_ctx->translen
 366             || curr_ctx->aborting) {
 367                 dprintk(curr_ctx->dev, "Finishing transaction\n");
 368                 curr_ctx->num_processed = 0;
 369                 v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->m2m_ctx);
 370         } else {
 371                 device_run(curr_ctx);
 372         }
 373 }
 374
 375 /*
 376  * video ioctls
 377  */
 378 static int vidioc_querycap(struct file *file, void *priv,
 379                            struct v4l2_capability *cap)
 380 {
 381         strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
 382         strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
 383         cap->bus_info[0] = 0;
 384         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
 385                           | V4L2_CAP_STREAMING;
 386
 387         return 0;
 388 }
 389
 390 static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
 391 {
 392         int i, num;
 393         struct m2mtest_fmt *fmt;
 394
 395         num = 0;
 396
 397         for (i = 0; i < NUM_FORMATS; ++i) {
 398                 if (formats[i].types & type) {
 399                         /* index-th format of type type found ? */
 400                         if (num == f->index)
 401                                 break;
 402                         /* Correct type but haven't reached our index yet,
 403                          * just increment per-type index */
 404                         ++num;
 405                 }
 406         }
 407
 408         if (i < NUM_FORMATS) {
 409                 /* Format found */
 410                 fmt = &formats[i];
 411                 strncpy(f->description, fmt->name, sizeof(f->description) - 1);
 412                 f->pixelformat = fmt->fourcc;
 413                 return 0;
 414         }
 415
 416         /* Format not found */
 417         return -EINVAL;
 418 }
 419
 420 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
 421                                    struct v4l2_fmtdesc *f)
 422 {
 423         return enum_fmt(f, MEM2MEM_CAPTURE);
 424 }
 425
 426 static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
 427                                    struct v4l2_fmtdesc *f)
 428 {
 429         return enum_fmt(f, MEM2MEM_OUTPUT);
 430 }
 431
 432 static int vidioc_g_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
 433 {
 434         struct vb2_queue *vq;
 435         struct m2mtest_q_data *q_data;
 436
 437         vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
 438         if (!vq)
 439                 return -EINVAL;
 440
 441         q_data = get_q_data(ctx, f->type);
 442
 443         f->fmt.pix.width        = q_data->width;
 444         f->fmt.pix.height       = q_data->height;
 445         f->fmt.pix.field        = V4L2_FIELD_NONE;
 446         f->fmt.pix.pixelformat  = q_data->fmt->fourcc;
 447         f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
 448         f->fmt.pix.sizeimage    = q_data->sizeimage;
 449
 450         return 0;
 451 }
 452
 453 static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
 454                                 struct v4l2_format *f)
 455 {
 456         return vidioc_g_fmt(priv, f);
 457 }
 458
 459 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 460                                 struct v4l2_format *f)
 461 {
 462         return vidioc_g_fmt(priv, f);
 463 }
 464
 465 static int vidioc_try_fmt(struct v4l2_format *f, struct m2mtest_fmt *fmt)
 466 {
 467         enum v4l2_field field;
 468
 469         field = f->fmt.pix.field;
 470
 471         if (field == V4L2_FIELD_ANY)
 472                 field = V4L2_FIELD_NONE;
 473         else if (V4L2_FIELD_NONE != field)
 474                 return -EINVAL;
 475
 476         /* V4L2 specification suggests the driver corrects the format struct
 477          * if any of the dimensions is unsupported */
 478         f->fmt.pix.field = field;
 479
 480         if (f->fmt.pix.height < MIN_H)
 481                 f->fmt.pix.height = MIN_H;
 482         else if (f->fmt.pix.height > MAX_H)
 483                 f->fmt.pix.height = MAX_H;
 484
 485         if (f->fmt.pix.width < MIN_W)
 486                 f->fmt.pix.width = MIN_W;
 487         else if (f->fmt.pix.width > MAX_W)
 488                 f->fmt.pix.width = MAX_W;
 489
 490         f->fmt.pix.width &= ~DIM_ALIGN_MASK;
 491         f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
 492         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
 493
 494         return 0;
 495 }
 496
 497 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 498                                   struct v4l2_format *f)
 499 {
 500         struct m2mtest_fmt *fmt;
 501         struct m2mtest_ctx *ctx = priv;
 502
 503         fmt = find_format(f);
 504         if (!fmt || !(fmt->types & MEM2MEM_CAPTURE)) {
 505                 v4l2_err(&ctx->dev->v4l2_dev,
 506                          "Fourcc format (0x%08x) invalid.\n",
 507                          f->fmt.pix.pixelformat);
 508                 return -EINVAL;
 509         }
 510
 511         return vidioc_try_fmt(f, fmt);
 512 }
 513
 514 static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
 515                                   struct v4l2_format *f)
 516 {
 517         struct m2mtest_fmt *fmt;
 518         struct m2mtest_ctx *ctx = priv;
 519
 520         fmt = find_format(f);
 521         if (!fmt || !(fmt->types & MEM2MEM_OUTPUT)) {
 522                 v4l2_err(&ctx->dev->v4l2_dev,
 523                          "Fourcc format (0x%08x) invalid.\n",
 524                          f->fmt.pix.pixelformat);
 525                 return -EINVAL;
 526         }
 527
 528         return vidioc_try_fmt(f, fmt);
 529 }
 530
 531 static int vidioc_s_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
 532 {
 533         struct m2mtest_q_data *q_data;
 534         struct vb2_queue *vq;
 535
 536         vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
 537         if (!vq)
 538                 return -EINVAL;
 539
 540         q_data = get_q_data(ctx, f->type);
 541         if (!q_data)
 542                 return -EINVAL;
 543
 544         if (vb2_is_busy(vq)) {
 545                 v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
 546                 return -EBUSY;
 547         }
 548
 549         q_data->fmt             = find_format(f);
 550         q_data->width           = f->fmt.pix.width;
 551         q_data->height          = f->fmt.pix.height;
 552         q_data->sizeimage       = q_data->width * q_data->height
 553                                 * q_data->fmt->depth >> 3;
 554
 555         dprintk(ctx->dev,
 556                 "Setting format for type %d, wxh: %dx%d, fmt: %d\n",
 557                 f->type, q_data->width, q_data->height, q_data->fmt->fourcc);
 558
 559         return 0;
 560 }
 561
 562 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 563                                 struct v4l2_format *f)
 564 {
 565         int ret;
 566
 567         ret = vidioc_try_fmt_vid_cap(file, priv, f);
 568         if (ret)
 569                 return ret;
 570
 571         return vidioc_s_fmt(priv, f);
 572 }
 573
 574 static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
 575                                 struct v4l2_format *f)
 576 {
 577         int ret;
 578
 579         ret = vidioc_try_fmt_vid_out(file, priv, f);
 580         if (ret)
 581                 return ret;
 582
 583         return vidioc_s_fmt(priv, f);
 584 }
 585
 586 static int vidioc_reqbufs(struct file *file, void *priv,
 587                           struct v4l2_requestbuffers *reqbufs)
 588 {
 589         struct m2mtest_ctx *ctx = priv;
 590
 591         return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
 592 }
 593
 594 static int vidioc_querybuf(struct file *file, void *priv,
 595                            struct v4l2_buffer *buf)
 596 {
 597         struct m2mtest_ctx *ctx = priv;
 598
 599         return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf);
 600 }
 601
 602 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 603 {
 604         struct m2mtest_ctx *ctx = priv;
 605
 606         return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
 607 }
 608
 609 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 610 {
 611         struct m2mtest_ctx *ctx = priv;
 612
 613         return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
 614 }
 615
 616 static int vidioc_streamon(struct file *file, void *priv,
 617                            enum v4l2_buf_type type)
 618 {
 619         struct m2mtest_ctx *ctx = priv;
 620
 621         return v4l2_m2m_streamon(file, ctx->m2m_ctx, type);
 622 }
 623
 624 static int vidioc_streamoff(struct file *file, void *priv,
 625                             enum v4l2_buf_type type)
 626 {
 627         struct m2mtest_ctx *ctx = priv;
 628
 629         return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
 630 }
 631
 632 static int vidioc_queryctrl(struct file *file, void *priv,
 633                             struct v4l2_queryctrl *qc)
 634 {
 635         struct v4l2_queryctrl *c;
 636
 637         c = get_ctrl(qc->id);
 638         if (!c)
 639                 return -EINVAL;
 640
 641         *qc = *c;
 642         return 0;
 643 }
 644
 645 static int vidioc_g_ctrl(struct file *file, void *priv,
 646                          struct v4l2_control *ctrl)
 647 {
 648         struct m2mtest_ctx *ctx = priv;
 649
 650         switch (ctrl->id) {
 651         case V4L2_CID_TRANS_TIME_MSEC:
 652                 ctrl->value = ctx->transtime;
 653                 break;
 654
 655         case V4L2_CID_TRANS_NUM_BUFS:
 656                 ctrl->value = ctx->translen;
 657                 break;
 658
 659         default:
 660                 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
 661                 return -EINVAL;
 662         }
 663
 664         return 0;
 665 }
 666
 667 static int check_ctrl_val(struct m2mtest_ctx *ctx, struct v4l2_control *ctrl)
 668 {
 669         struct v4l2_queryctrl *c;
 670
 671         c = get_ctrl(ctrl->id);
 672         if (!c)
 673                 return -EINVAL;
 674
 675         if (ctrl->value < c->minimum || ctrl->value > c->maximum) {
 676                 v4l2_err(&ctx->dev->v4l2_dev, "Value out of range\n");
 677                 return -ERANGE;
 678         }
 679
 680         return 0;
 681 }
 682
 683 static int vidioc_s_ctrl(struct file *file, void *priv,
 684                          struct v4l2_control *ctrl)
 685 {
 686         struct m2mtest_ctx *ctx = priv;
 687         int ret = 0;
 688
 689         ret = check_ctrl_val(ctx, ctrl);
 690         if (ret != 0)
 691                 return ret;
 692
 693         switch (ctrl->id) {
 694         case V4L2_CID_TRANS_TIME_MSEC:
 695                 ctx->transtime = ctrl->value;
 696                 break;
 697
 698         case V4L2_CID_TRANS_NUM_BUFS:
 699                 ctx->translen = ctrl->value;
 700                 break;
 701
 702         default:
 703                 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
 704                 return -EINVAL;
 705         }
 706
 707         return 0;
 708 }
 709
 710
 711 static const struct v4l2_ioctl_ops m2mtest_ioctl_ops = {
 712         .vidioc_querycap        = vidioc_querycap,
 713
 714         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
 715         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
 716         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
 717         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
 718
 719         .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
 720         .vidioc_g_fmt_vid_out   = vidioc_g_fmt_vid_out,
 721         .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out,
 722         .vidioc_s_fmt_vid_out   = vidioc_s_fmt_vid_out,
 723
 724         .vidioc_reqbufs         = vidioc_reqbufs,
 725         .vidioc_querybuf        = vidioc_querybuf,
 726
 727         .vidioc_qbuf            = vidioc_qbuf,
 728         .vidioc_dqbuf           = vidioc_dqbuf,
 729
 730         .vidioc_streamon        = vidioc_streamon,
 731         .vidioc_streamoff       = vidioc_streamoff,
 732
 733         .vidioc_queryctrl       = vidioc_queryctrl,
 734         .vidioc_g_ctrl          = vidioc_g_ctrl,
 735         .vidioc_s_ctrl          = vidioc_s_ctrl,
 736 };
 737
 738
 739 /*
 740  * Queue operations
 741  */
 742
 743 static int m2mtest_queue_setup(struct vb2_queue *vq,
 744                                 const struct v4l2_format *fmt,
 745                                 unsigned int *nbuffers, unsigned int *nplanes,
 746                                 unsigned int sizes[], void *alloc_ctxs[])
 747 {
 748         struct m2mtest_ctx *ctx = vb2_get_drv_priv(vq);
 749         struct m2mtest_q_data *q_data;
 750         unsigned int size, count = *nbuffers;
 751
 752         q_data = get_q_data(ctx, vq->type);
 753
 754         size = q_data->width * q_data->height * q_data->fmt->depth >> 3;
 755
 756         while (size * count > MEM2MEM_VID_MEM_LIMIT)
 757                 (count)--;
 758
 759         *nplanes = 1;
 760         *nbuffers = count;
 761         sizes[0] = size;
 762
 763         /*
 764          * videobuf2-vmalloc allocator is context-less so no need to set
 765          * alloc_ctxs array.
 766          */
 767
 768         dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size);
 769
 770         return 0;
 771 }
 772
 773 static int m2mtest_buf_prepare(struct vb2_buffer *vb)
 774 {
 775         struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 776         struct m2mtest_q_data *q_data;
 777
 778         dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type);
 779
 780         q_data = get_q_data(ctx, vb->vb2_queue->type);
 781
 782         if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
 783                 dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n",
 784                                 __func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage);
 785                 return -EINVAL;
 786         }
 787
 788         vb2_set_plane_payload(vb, 0, q_data->sizeimage);
 789
 790         return 0;
 791 }
 792
 793 static void m2mtest_buf_queue(struct vb2_buffer *vb)
 794 {
 795         struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 796         v4l2_m2m_buf_queue(ctx->m2m_ctx, vb);
 797 }
 798
 799 static void m2mtest_wait_prepare(struct vb2_queue *q)
 800 {
 801         struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
 802         m2mtest_unlock(ctx);
 803 }
 804
 805 static void m2mtest_wait_finish(struct vb2_queue *q)
 806 {
 807         struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
 808         m2mtest_lock(ctx);
 809 }
 810
 811 static struct vb2_ops m2mtest_qops = {
 812         .queue_setup     = m2mtest_queue_setup,
 813         .buf_prepare     = m2mtest_buf_prepare,
 814         .buf_queue       = m2mtest_buf_queue,
 815         .wait_prepare    = m2mtest_wait_prepare,
 816         .wait_finish     = m2mtest_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         memset(src_vq, 0, sizeof(*src_vq));
 825         src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 826         src_vq->io_modes = VB2_MMAP;
 827         src_vq->drv_priv = ctx;
 828         src_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
 829         src_vq->ops = &m2mtest_qops;
 830         src_vq->mem_ops = &vb2_vmalloc_memops;
 831
 832         ret = vb2_queue_init(src_vq);
 833         if (ret)
 834                 return ret;
 835
 836         memset(dst_vq, 0, sizeof(*dst_vq));
 837         dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 838         dst_vq->io_modes = VB2_MMAP;
 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
 844         return vb2_queue_init(dst_vq);
 845 }
 846
 847 /*
 848  * File operations
 849  */
 850 static int m2mtest_open(struct file *file)
 851 {
 852         struct m2mtest_dev *dev = video_drvdata(file);
 853         struct m2mtest_ctx *ctx = NULL;
 854
 855         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 856         if (!ctx)
 857                 return -ENOMEM;
 858
 859         file->private_data = ctx;
 860         ctx->dev = dev;
 861         ctx->translen = MEM2MEM_DEF_TRANSLEN;
 862         ctx->transtime = MEM2MEM_DEF_TRANSTIME;
 863         ctx->num_processed = 0;
 864
 865         ctx->q_data[V4L2_M2M_SRC].fmt = &formats[0];
 866         ctx->q_data[V4L2_M2M_DST].fmt = &formats[0];
 867
 868         ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
 869
 870         if (IS_ERR(ctx->m2m_ctx)) {
 871                 int ret = PTR_ERR(ctx->m2m_ctx);
 872
 873                 kfree(ctx);
 874                 return ret;
 875         }
 876
 877         atomic_inc(&dev->num_inst);
 878
 879         dprintk(dev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx);
 880
 881         return 0;
 882 }
 883
 884 static int m2mtest_release(struct file *file)
 885 {
 886         struct m2mtest_dev *dev = video_drvdata(file);
 887         struct m2mtest_ctx *ctx = file->private_data;
 888
 889         dprintk(dev, "Releasing instance %p\n", ctx);
 890
 891         v4l2_m2m_ctx_release(ctx->m2m_ctx);
 892         kfree(ctx);
 893
 894         atomic_dec(&dev->num_inst);
 895
 896         return 0;
 897 }
 898
 899 static unsigned int m2mtest_poll(struct file *file,
 900                                  struct poll_table_struct *wait)
 901 {
 902         struct m2mtest_ctx *ctx = file->private_data;
 903
 904         return v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
 905 }
 906
 907 static int m2mtest_mmap(struct file *file, struct vm_area_struct *vma)
 908 {
 909         struct m2mtest_ctx *ctx = file->private_data;
 910
 911         return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
 912 }
 913
 914 static const struct v4l2_file_operations m2mtest_fops = {
 915         .owner          = THIS_MODULE,
 916         .open           = m2mtest_open,
 917         .release        = m2mtest_release,
 918         .poll           = m2mtest_poll,
 919         .unlocked_ioctl = video_ioctl2,
 920         .mmap           = m2mtest_mmap,
 921 };
 922
 923 static struct video_device m2mtest_videodev = {
 924         .name           = MEM2MEM_NAME,
 925         .fops           = &m2mtest_fops,
 926         .ioctl_ops      = &m2mtest_ioctl_ops,
 927         .minor          = -1,
 928         .release        = video_device_release,
 929 };
 930
 931 static struct v4l2_m2m_ops m2m_ops = {
 932         .device_run     = device_run,
 933         .job_ready      = job_ready,
 934         .job_abort      = job_abort,
 935         .lock           = m2mtest_lock,
 936         .unlock         = m2mtest_unlock,
 937 };
 938
 939 static int m2mtest_probe(struct platform_device *pdev)
 940 {
 941         struct m2mtest_dev *dev;
 942         struct video_device *vfd;
 943         int ret;
 944
 945         dev = kzalloc(sizeof *dev, GFP_KERNEL);
 946         if (!dev)
 947                 return -ENOMEM;
 948
 949         spin_lock_init(&dev->irqlock);
 950
 951         ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
 952         if (ret)
 953                 goto free_dev;
 954
 955         atomic_set(&dev->num_inst, 0);
 956         mutex_init(&dev->dev_mutex);
 957
 958         vfd = video_device_alloc();
 959         if (!vfd) {
 960                 v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
 961                 ret = -ENOMEM;
 962                 goto unreg_dev;
 963         }
 964
 965         *vfd = m2mtest_videodev;
 966         /* Locking in file operations other than ioctl should be done
 967            by the driver, not the V4L2 core.
 968            This driver needs auditing so that this flag can be removed. */
 969         set_bit(V4L2_FL_LOCK_ALL_FOPS, &vfd->flags);
 970         vfd->lock = &dev->dev_mutex;
 971
 972         ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
 973         if (ret) {
 974                 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
 975                 goto rel_vdev;
 976         }
 977
 978         video_set_drvdata(vfd, dev);
 979         snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name);
 980         dev->vfd = vfd;
 981         v4l2_info(&dev->v4l2_dev, MEM2MEM_TEST_MODULE_NAME
 982                         "Device registered as /dev/video%d\n", vfd->num);
 983
 984         setup_timer(&dev->timer, device_isr, (long)dev);
 985         platform_set_drvdata(pdev, dev);
 986
 987         dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
 988         if (IS_ERR(dev->m2m_dev)) {
 989                 v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
 990                 ret = PTR_ERR(dev->m2m_dev);
 991                 goto err_m2m;
 992         }
 993
 994         return 0;
 995
 996         v4l2_m2m_release(dev->m2m_dev);
 997 err_m2m:
 998         video_unregister_device(dev->vfd);
 999 rel_vdev:
1000         video_device_release(vfd);
1001 unreg_dev:
1002         v4l2_device_unregister(&dev->v4l2_dev);
1003 free_dev:
1004         kfree(dev);
1005
1006         return ret;
1007 }
1008
1009 static int m2mtest_remove(struct platform_device *pdev)
1010 {
1011         struct m2mtest_dev *dev =
1012                 (struct m2mtest_dev *)platform_get_drvdata(pdev);
1013
1014         v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME);
1015         v4l2_m2m_release(dev->m2m_dev);
1016         del_timer_sync(&dev->timer);
1017         video_unregister_device(dev->vfd);
1018         v4l2_device_unregister(&dev->v4l2_dev);
1019         kfree(dev);
1020
1021         return 0;
1022 }
1023
1024 static struct platform_driver m2mtest_pdrv = {
1025         .probe          = m2mtest_probe,
1026         .remove         = m2mtest_remove,
1027         .driver         = {
1028                 .name   = MEM2MEM_NAME,
1029                 .owner  = THIS_MODULE,
1030         },
1031 };
1032
1033 static void __exit m2mtest_exit(void)
1034 {
1035         platform_driver_unregister(&m2mtest_pdrv);
1036         platform_device_unregister(&m2mtest_pdev);
1037 }
1038
1039 static int __init m2mtest_init(void)
1040 {
1041         int ret;
1042
1043         ret = platform_device_register(&m2mtest_pdev);
1044         if (ret)
1045                 return ret;
1046
1047         ret = platform_driver_register(&m2mtest_pdrv);
1048         if (ret)
1049                 platform_device_unregister(&m2mtest_pdev);
1050
1051         return 0;
1052 }
1053
1054 module_init(m2mtest_init);
1055 module_exit(m2mtest_exit);
1056