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 0x08 /* 8-alignment for dimensions */
  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 /* Source and destination queue data */
 114 static struct m2mtest_q_data q_data[2];
 115
 116 static struct m2mtest_q_data *get_q_data(enum v4l2_buf_type type)
 117 {
 118         switch (type) {
 119         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 120                 return &q_data[V4L2_M2M_SRC];
 121         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 122                 return &q_data[V4L2_M2M_DST];
 123         default:
 124                 BUG();
 125         }
 126         return NULL;
 127 }
 128
 129 #define V4L2_CID_TRANS_TIME_MSEC        V4L2_CID_PRIVATE_BASE
 130 #define V4L2_CID_TRANS_NUM_BUFS         (V4L2_CID_PRIVATE_BASE + 1)
 131
 132 static struct v4l2_queryctrl m2mtest_ctrls[] = {
 133         {
 134                 .id             = V4L2_CID_TRANS_TIME_MSEC,
 135                 .type           = V4L2_CTRL_TYPE_INTEGER,
 136                 .name           = "Transaction time (msec)",
 137                 .minimum        = 1,
 138                 .maximum        = 10000,
 139                 .step           = 100,
 140                 .default_value  = 1000,
 141                 .flags          = 0,
 142         }, {
 143                 .id             = V4L2_CID_TRANS_NUM_BUFS,
 144                 .type           = V4L2_CTRL_TYPE_INTEGER,
 145                 .name           = "Buffers per transaction",
 146                 .minimum        = 1,
 147                 .maximum        = MEM2MEM_DEF_NUM_BUFS,
 148                 .step           = 1,
 149                 .default_value  = 1,
 150                 .flags          = 0,
 151         },
 152 };
 153
 154 #define NUM_FORMATS ARRAY_SIZE(formats)
 155
 156 static struct m2mtest_fmt *find_format(struct v4l2_format *f)
 157 {
 158         struct m2mtest_fmt *fmt;
 159         unsigned int k;
 160
 161         for (k = 0; k < NUM_FORMATS; k++) {
 162                 fmt = &formats[k];
 163                 if (fmt->fourcc == f->fmt.pix.pixelformat)
 164                         break;
 165         }
 166
 167         if (k == NUM_FORMATS)
 168                 return NULL;
 169
 170         return &formats[k];
 171 }
 172
 173 struct m2mtest_dev {
 174         struct v4l2_device      v4l2_dev;
 175         struct video_device     *vfd;
 176
 177         atomic_t                num_inst;
 178         struct mutex            dev_mutex;
 179         spinlock_t              irqlock;
 180
 181         struct timer_list       timer;
 182
 183         struct v4l2_m2m_dev     *m2m_dev;
 184 };
 185
 186 struct m2mtest_ctx {
 187         struct m2mtest_dev      *dev;
 188
 189         /* Processed buffers in this transaction */
 190         u8                      num_processed;
 191
 192         /* Transaction length (i.e. how many buffers per transaction) */
 193         u32                     translen;
 194         /* Transaction time (i.e. simulated processing time) in milliseconds */
 195         u32                     transtime;
 196
 197         /* Abort requested by m2m */
 198         int                     aborting;
 199
 200         struct v4l2_m2m_ctx     *m2m_ctx;
 201 };
 202
 203 static struct v4l2_queryctrl *get_ctrl(int id)
 204 {
 205         int i;
 206
 207         for (i = 0; i < ARRAY_SIZE(m2mtest_ctrls); ++i) {
 208                 if (id == m2mtest_ctrls[i].id)
 209                         return &m2mtest_ctrls[i];
 210         }
 211
 212         return NULL;
 213 }
 214
 215 static int device_process(struct m2mtest_ctx *ctx,
 216                           struct vb2_buffer *in_vb,
 217                           struct vb2_buffer *out_vb)
 218 {
 219         struct m2mtest_dev *dev = ctx->dev;
 220         struct m2mtest_q_data *q_data;
 221         u8 *p_in, *p_out;
 222         int x, y, t, w;
 223         int tile_w, bytes_left;
 224         int width, height, bytesperline;
 225
 226         q_data = get_q_data(V4L2_BUF_TYPE_VIDEO_OUTPUT);
 227
 228         width   = q_data->width;
 229         height  = q_data->height;
 230         bytesperline    = (q_data->width * q_data->fmt->depth) >> 3;
 231
 232         p_in = vb2_plane_vaddr(in_vb, 0);
 233         p_out = vb2_plane_vaddr(out_vb, 0);
 234         if (!p_in || !p_out) {
 235                 v4l2_err(&dev->v4l2_dev,
 236                          "Acquiring kernel pointers to buffers failed\n");
 237                 return -EFAULT;
 238         }
 239
 240         if (vb2_plane_size(in_vb, 0) > vb2_plane_size(out_vb, 0)) {
 241                 v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n");
 242                 return -EINVAL;
 243         }
 244
 245         tile_w = (width * (q_data[V4L2_M2M_DST].fmt->depth >> 3))
 246                 / MEM2MEM_NUM_TILES;
 247         bytes_left = bytesperline - tile_w * MEM2MEM_NUM_TILES;
 248         w = 0;
 249
 250         for (y = 0; y < height; ++y) {
 251                 for (t = 0; t < MEM2MEM_NUM_TILES; ++t) {
 252                         if (w & 0x1) {
 253                                 for (x = 0; x < tile_w; ++x)
 254                                         *p_out++ = *p_in++ + MEM2MEM_COLOR_STEP;
 255                         } else {
 256                                 for (x = 0; x < tile_w; ++x)
 257                                         *p_out++ = *p_in++ - MEM2MEM_COLOR_STEP;
 258                         }
 259                         ++w;
 260                 }
 261                 p_in += bytes_left;
 262                 p_out += bytes_left;
 263         }
 264
 265         return 0;
 266 }
 267
 268 static void schedule_irq(struct m2mtest_dev *dev, int msec_timeout)
 269 {
 270         dprintk(dev, "Scheduling a simulated irq\n");
 271         mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout));
 272 }
 273
 274 /*
 275  * mem2mem callbacks
 276  */
 277
 278 /**
 279  * job_ready() - check whether an instance is ready to be scheduled to run
 280  */
 281 static int job_ready(void *priv)
 282 {
 283         struct m2mtest_ctx *ctx = priv;
 284
 285         if (v4l2_m2m_num_src_bufs_ready(ctx->m2m_ctx) < ctx->translen
 286             || v4l2_m2m_num_dst_bufs_ready(ctx->m2m_ctx) < ctx->translen) {
 287                 dprintk(ctx->dev, "Not enough buffers available\n");
 288                 return 0;
 289         }
 290
 291         return 1;
 292 }
 293
 294 static void job_abort(void *priv)
 295 {
 296         struct m2mtest_ctx *ctx = priv;
 297
 298         /* Will cancel the transaction in the next interrupt handler */
 299         ctx->aborting = 1;
 300 }
 301
 302 static void m2mtest_lock(void *priv)
 303 {
 304         struct m2mtest_ctx *ctx = priv;
 305         struct m2mtest_dev *dev = ctx->dev;
 306         mutex_lock(&dev->dev_mutex);
 307 }
 308
 309 static void m2mtest_unlock(void *priv)
 310 {
 311         struct m2mtest_ctx *ctx = priv;
 312         struct m2mtest_dev *dev = ctx->dev;
 313         mutex_unlock(&dev->dev_mutex);
 314 }
 315
 316
 317 /* device_run() - prepares and starts the device
 318  *
 319  * This simulates all the immediate preparations required before starting
 320  * a device. This will be called by the framework when it decides to schedule
 321  * a particular instance.
 322  */
 323 static void device_run(void *priv)
 324 {
 325         struct m2mtest_ctx *ctx = priv;
 326         struct m2mtest_dev *dev = ctx->dev;
 327         struct vb2_buffer *src_buf, *dst_buf;
 328
 329         src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
 330         dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
 331
 332         device_process(ctx, src_buf, dst_buf);
 333
 334         /* Run a timer, which simulates a hardware irq  */
 335         schedule_irq(dev, ctx->transtime);
 336 }
 337
 338 static void device_isr(unsigned long priv)
 339 {
 340         struct m2mtest_dev *m2mtest_dev = (struct m2mtest_dev *)priv;
 341         struct m2mtest_ctx *curr_ctx;
 342         struct vb2_buffer *src_vb, *dst_vb;
 343         unsigned long flags;
 344
 345         curr_ctx = v4l2_m2m_get_curr_priv(m2mtest_dev->m2m_dev);
 346
 347         if (NULL == curr_ctx) {
 348                 printk(KERN_ERR
 349                         "Instance released before the end of transaction\n");
 350                 return;
 351         }
 352
 353         src_vb = v4l2_m2m_src_buf_remove(curr_ctx->m2m_ctx);
 354         dst_vb = v4l2_m2m_dst_buf_remove(curr_ctx->m2m_ctx);
 355
 356         curr_ctx->num_processed++;
 357
 358         spin_lock_irqsave(&m2mtest_dev->irqlock, flags);
 359         v4l2_m2m_buf_done(src_vb, VB2_BUF_STATE_DONE);
 360         v4l2_m2m_buf_done(dst_vb, VB2_BUF_STATE_DONE);
 361         spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags);
 362
 363         if (curr_ctx->num_processed == curr_ctx->translen
 364             || curr_ctx->aborting) {
 365                 dprintk(curr_ctx->dev, "Finishing transaction\n");
 366                 curr_ctx->num_processed = 0;
 367                 v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->m2m_ctx);
 368         } else {
 369                 device_run(curr_ctx);
 370         }
 371 }
 372
 373 /*
 374  * video ioctls
 375  */
 376 static int vidioc_querycap(struct file *file, void *priv,
 377                            struct v4l2_capability *cap)
 378 {
 379         strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
 380         strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
 381         cap->bus_info[0] = 0;
 382         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
 383                           | V4L2_CAP_STREAMING;
 384
 385         return 0;
 386 }
 387
 388 static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
 389 {
 390         int i, num;
 391         struct m2mtest_fmt *fmt;
 392
 393         num = 0;
 394
 395         for (i = 0; i < NUM_FORMATS; ++i) {
 396                 if (formats[i].types & type) {
 397                         /* index-th format of type type found ? */
 398                         if (num == f->index)
 399                                 break;
 400                         /* Correct type but haven't reached our index yet,
 401                          * just increment per-type index */
 402                         ++num;
 403                 }
 404         }
 405
 406         if (i < NUM_FORMATS) {
 407                 /* Format found */
 408                 fmt = &formats[i];
 409                 strncpy(f->description, fmt->name, sizeof(f->description) - 1);
 410                 f->pixelformat = fmt->fourcc;
 411                 return 0;
 412         }
 413
 414         /* Format not found */
 415         return -EINVAL;
 416 }
 417
 418 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
 419                                    struct v4l2_fmtdesc *f)
 420 {
 421         return enum_fmt(f, MEM2MEM_CAPTURE);
 422 }
 423
 424 static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
 425                                    struct v4l2_fmtdesc *f)
 426 {
 427         return enum_fmt(f, MEM2MEM_OUTPUT);
 428 }
 429
 430 static int vidioc_g_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
 431 {
 432         struct vb2_queue *vq;
 433         struct m2mtest_q_data *q_data;
 434
 435         vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
 436         if (!vq)
 437                 return -EINVAL;
 438
 439         q_data = get_q_data(f->type);
 440
 441         f->fmt.pix.width        = q_data->width;
 442         f->fmt.pix.height       = q_data->height;
 443         f->fmt.pix.field        = V4L2_FIELD_NONE;
 444         f->fmt.pix.pixelformat  = q_data->fmt->fourcc;
 445         f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
 446         f->fmt.pix.sizeimage    = q_data->sizeimage;
 447
 448         return 0;
 449 }
 450
 451 static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
 452                                 struct v4l2_format *f)
 453 {
 454         return vidioc_g_fmt(priv, f);
 455 }
 456
 457 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 458                                 struct v4l2_format *f)
 459 {
 460         return vidioc_g_fmt(priv, f);
 461 }
 462
 463 static int vidioc_try_fmt(struct v4l2_format *f, struct m2mtest_fmt *fmt)
 464 {
 465         enum v4l2_field field;
 466
 467         field = f->fmt.pix.field;
 468
 469         if (field == V4L2_FIELD_ANY)
 470                 field = V4L2_FIELD_NONE;
 471         else if (V4L2_FIELD_NONE != field)
 472                 return -EINVAL;
 473
 474         /* V4L2 specification suggests the driver corrects the format struct
 475          * if any of the dimensions is unsupported */
 476         f->fmt.pix.field = field;
 477
 478         if (f->fmt.pix.height < MIN_H)
 479                 f->fmt.pix.height = MIN_H;
 480         else if (f->fmt.pix.height > MAX_H)
 481                 f->fmt.pix.height = MAX_H;
 482
 483         if (f->fmt.pix.width < MIN_W)
 484                 f->fmt.pix.width = MIN_W;
 485         else if (f->fmt.pix.width > MAX_W)
 486                 f->fmt.pix.width = MAX_W;
 487
 488         f->fmt.pix.width &= ~DIM_ALIGN_MASK;
 489         f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
 490         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
 491
 492         return 0;
 493 }
 494
 495 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 496                                   struct v4l2_format *f)
 497 {
 498         struct m2mtest_fmt *fmt;
 499         struct m2mtest_ctx *ctx = priv;
 500
 501         fmt = find_format(f);
 502         if (!fmt || !(fmt->types & MEM2MEM_CAPTURE)) {
 503                 v4l2_err(&ctx->dev->v4l2_dev,
 504                          "Fourcc format (0x%08x) invalid.\n",
 505                          f->fmt.pix.pixelformat);
 506                 return -EINVAL;
 507         }
 508
 509         return vidioc_try_fmt(f, fmt);
 510 }
 511
 512 static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
 513                                   struct v4l2_format *f)
 514 {
 515         struct m2mtest_fmt *fmt;
 516         struct m2mtest_ctx *ctx = priv;
 517
 518         fmt = find_format(f);
 519         if (!fmt || !(fmt->types & MEM2MEM_OUTPUT)) {
 520                 v4l2_err(&ctx->dev->v4l2_dev,
 521                          "Fourcc format (0x%08x) invalid.\n",
 522                          f->fmt.pix.pixelformat);
 523                 return -EINVAL;
 524         }
 525
 526         return vidioc_try_fmt(f, fmt);
 527 }
 528
 529 static int vidioc_s_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
 530 {
 531         struct m2mtest_q_data *q_data;
 532         struct vb2_queue *vq;
 533
 534         vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
 535         if (!vq)
 536                 return -EINVAL;
 537
 538         q_data = get_q_data(f->type);
 539         if (!q_data)
 540                 return -EINVAL;
 541
 542         if (vb2_is_busy(vq)) {
 543                 v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
 544                 return -EBUSY;
 545         }
 546
 547         q_data->fmt             = find_format(f);
 548         q_data->width           = f->fmt.pix.width;
 549         q_data->height          = f->fmt.pix.height;
 550         q_data->sizeimage       = q_data->width * q_data->height
 551                                 * q_data->fmt->depth >> 3;
 552
 553         dprintk(ctx->dev,
 554                 "Setting format for type %d, wxh: %dx%d, fmt: %d\n",
 555                 f->type, q_data->width, q_data->height, q_data->fmt->fourcc);
 556
 557         return 0;
 558 }
 559
 560 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 561                                 struct v4l2_format *f)
 562 {
 563         int ret;
 564
 565         ret = vidioc_try_fmt_vid_cap(file, priv, f);
 566         if (ret)
 567                 return ret;
 568
 569         return vidioc_s_fmt(priv, f);
 570 }
 571
 572 static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
 573                                 struct v4l2_format *f)
 574 {
 575         int ret;
 576
 577         ret = vidioc_try_fmt_vid_out(file, priv, f);
 578         if (ret)
 579                 return ret;
 580
 581         return vidioc_s_fmt(priv, f);
 582 }
 583
 584 static int vidioc_reqbufs(struct file *file, void *priv,
 585                           struct v4l2_requestbuffers *reqbufs)
 586 {
 587         struct m2mtest_ctx *ctx = priv;
 588
 589         return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
 590 }
 591
 592 static int vidioc_querybuf(struct file *file, void *priv,
 593                            struct v4l2_buffer *buf)
 594 {
 595         struct m2mtest_ctx *ctx = priv;
 596
 597         return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf);
 598 }
 599
 600 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 601 {
 602         struct m2mtest_ctx *ctx = priv;
 603
 604         return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
 605 }
 606
 607 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 608 {
 609         struct m2mtest_ctx *ctx = priv;
 610
 611         return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
 612 }
 613
 614 static int vidioc_streamon(struct file *file, void *priv,
 615                            enum v4l2_buf_type type)
 616 {
 617         struct m2mtest_ctx *ctx = priv;
 618
 619         return v4l2_m2m_streamon(file, ctx->m2m_ctx, type);
 620 }
 621
 622 static int vidioc_streamoff(struct file *file, void *priv,
 623                             enum v4l2_buf_type type)
 624 {
 625         struct m2mtest_ctx *ctx = priv;
 626
 627         return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
 628 }
 629
 630 static int vidioc_queryctrl(struct file *file, void *priv,
 631                             struct v4l2_queryctrl *qc)
 632 {
 633         struct v4l2_queryctrl *c;
 634
 635         c = get_ctrl(qc->id);
 636         if (!c)
 637                 return -EINVAL;
 638
 639         *qc = *c;
 640         return 0;
 641 }
 642
 643 static int vidioc_g_ctrl(struct file *file, void *priv,
 644                          struct v4l2_control *ctrl)
 645 {
 646         struct m2mtest_ctx *ctx = priv;
 647
 648         switch (ctrl->id) {
 649         case V4L2_CID_TRANS_TIME_MSEC:
 650                 ctrl->value = ctx->transtime;
 651                 break;
 652
 653         case V4L2_CID_TRANS_NUM_BUFS:
 654                 ctrl->value = ctx->translen;
 655                 break;
 656
 657         default:
 658                 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
 659                 return -EINVAL;
 660         }
 661
 662         return 0;
 663 }
 664
 665 static int check_ctrl_val(struct m2mtest_ctx *ctx, struct v4l2_control *ctrl)
 666 {
 667         struct v4l2_queryctrl *c;
 668
 669         c = get_ctrl(ctrl->id);
 670         if (!c)
 671                 return -EINVAL;
 672
 673         if (ctrl->value < c->minimum || ctrl->value > c->maximum) {
 674                 v4l2_err(&ctx->dev->v4l2_dev, "Value out of range\n");
 675                 return -ERANGE;
 676         }
 677
 678         return 0;
 679 }
 680
 681 static int vidioc_s_ctrl(struct file *file, void *priv,
 682                          struct v4l2_control *ctrl)
 683 {
 684         struct m2mtest_ctx *ctx = priv;
 685         int ret = 0;
 686
 687         ret = check_ctrl_val(ctx, ctrl);
 688         if (ret != 0)
 689                 return ret;
 690
 691         switch (ctrl->id) {
 692         case V4L2_CID_TRANS_TIME_MSEC:
 693                 ctx->transtime = ctrl->value;
 694                 break;
 695
 696         case V4L2_CID_TRANS_NUM_BUFS:
 697                 ctx->translen = ctrl->value;
 698                 break;
 699
 700         default:
 701                 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
 702                 return -EINVAL;
 703         }
 704
 705         return 0;
 706 }
 707
 708
 709 static const struct v4l2_ioctl_ops m2mtest_ioctl_ops = {
 710         .vidioc_querycap        = vidioc_querycap,
 711
 712         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
 713         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
 714         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
 715         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
 716
 717         .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
 718         .vidioc_g_fmt_vid_out   = vidioc_g_fmt_vid_out,
 719         .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out,
 720         .vidioc_s_fmt_vid_out   = vidioc_s_fmt_vid_out,
 721
 722         .vidioc_reqbufs         = vidioc_reqbufs,
 723         .vidioc_querybuf        = vidioc_querybuf,
 724
 725         .vidioc_qbuf            = vidioc_qbuf,
 726         .vidioc_dqbuf           = vidioc_dqbuf,
 727
 728         .vidioc_streamon        = vidioc_streamon,
 729         .vidioc_streamoff       = vidioc_streamoff,
 730
 731         .vidioc_queryctrl       = vidioc_queryctrl,
 732         .vidioc_g_ctrl          = vidioc_g_ctrl,
 733         .vidioc_s_ctrl          = vidioc_s_ctrl,
 734 };
 735
 736
 737 /*
 738  * Queue operations
 739  */
 740
 741 static int m2mtest_queue_setup(struct vb2_queue *vq,
 742                                 const struct v4l2_format *fmt,
 743                                 unsigned int *nbuffers, unsigned int *nplanes,
 744                                 unsigned int sizes[], void *alloc_ctxs[])
 745 {
 746         struct m2mtest_ctx *ctx = vb2_get_drv_priv(vq);
 747         struct m2mtest_q_data *q_data;
 748         unsigned int size, count = *nbuffers;
 749
 750         q_data = get_q_data(vq->type);
 751
 752         size = q_data->width * q_data->height * q_data->fmt->depth >> 3;
 753
 754         while (size * count > MEM2MEM_VID_MEM_LIMIT)
 755                 (count)--;
 756
 757         *nplanes = 1;
 758         *nbuffers = count;
 759         sizes[0] = size;
 760
 761         /*
 762          * videobuf2-vmalloc allocator is context-less so no need to set
 763          * alloc_ctxs array.
 764          */
 765
 766         dprintk(ctx->dev, "get %d buffer(s) of size %d each.\n", count, size);
 767
 768         return 0;
 769 }
 770
 771 static int m2mtest_buf_prepare(struct vb2_buffer *vb)
 772 {
 773         struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 774         struct m2mtest_q_data *q_data;
 775
 776         dprintk(ctx->dev, "type: %d\n", vb->vb2_queue->type);
 777
 778         q_data = get_q_data(vb->vb2_queue->type);
 779
 780         if (vb2_plane_size(vb, 0) < q_data->sizeimage) {
 781                 dprintk(ctx->dev, "%s data will not fit into plane (%lu < %lu)\n",
 782                                 __func__, vb2_plane_size(vb, 0), (long)q_data->sizeimage);
 783                 return -EINVAL;
 784         }
 785
 786         vb2_set_plane_payload(vb, 0, q_data->sizeimage);
 787
 788         return 0;
 789 }
 790
 791 static void m2mtest_buf_queue(struct vb2_buffer *vb)
 792 {
 793         struct m2mtest_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
 794         v4l2_m2m_buf_queue(ctx->m2m_ctx, vb);
 795 }
 796
 797 static void m2mtest_wait_prepare(struct vb2_queue *q)
 798 {
 799         struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
 800         m2mtest_unlock(ctx);
 801 }
 802
 803 static void m2mtest_wait_finish(struct vb2_queue *q)
 804 {
 805         struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
 806         m2mtest_lock(ctx);
 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         .wait_prepare    = m2mtest_wait_prepare,
 814         .wait_finish     = m2mtest_wait_finish,
 815 };
 816
 817 static int queue_init(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq)
 818 {
 819         struct m2mtest_ctx *ctx = priv;
 820         int ret;
 821
 822         memset(src_vq, 0, sizeof(*src_vq));
 823         src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 824         src_vq->io_modes = VB2_MMAP;
 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
 830         ret = vb2_queue_init(src_vq);
 831         if (ret)
 832                 return ret;
 833
 834         memset(dst_vq, 0, sizeof(*dst_vq));
 835         dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 836         dst_vq->io_modes = VB2_MMAP;
 837         dst_vq->drv_priv = ctx;
 838         dst_vq->buf_struct_size = sizeof(struct v4l2_m2m_buffer);
 839         dst_vq->ops = &m2mtest_qops;
 840         dst_vq->mem_ops = &vb2_vmalloc_memops;
 841
 842         return vb2_queue_init(dst_vq);
 843 }
 844
 845 /*
 846  * File operations
 847  */
 848 static int m2mtest_open(struct file *file)
 849 {
 850         struct m2mtest_dev *dev = video_drvdata(file);
 851         struct m2mtest_ctx *ctx = NULL;
 852
 853         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 854         if (!ctx)
 855                 return -ENOMEM;
 856
 857         file->private_data = ctx;
 858         ctx->dev = dev;
 859         ctx->translen = MEM2MEM_DEF_TRANSLEN;
 860         ctx->transtime = MEM2MEM_DEF_TRANSTIME;
 861         ctx->num_processed = 0;
 862
 863         ctx->m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, ctx, &queue_init);
 864
 865         if (IS_ERR(ctx->m2m_ctx)) {
 866                 int ret = PTR_ERR(ctx->m2m_ctx);
 867
 868                 kfree(ctx);
 869                 return ret;
 870         }
 871
 872         atomic_inc(&dev->num_inst);
 873
 874         dprintk(dev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx);
 875
 876         return 0;
 877 }
 878
 879 static int m2mtest_release(struct file *file)
 880 {
 881         struct m2mtest_dev *dev = video_drvdata(file);
 882         struct m2mtest_ctx *ctx = file->private_data;
 883
 884         dprintk(dev, "Releasing instance %p\n", ctx);
 885
 886         v4l2_m2m_ctx_release(ctx->m2m_ctx);
 887         kfree(ctx);
 888
 889         atomic_dec(&dev->num_inst);
 890
 891         return 0;
 892 }
 893
 894 static unsigned int m2mtest_poll(struct file *file,
 895                                  struct poll_table_struct *wait)
 896 {
 897         struct m2mtest_ctx *ctx = file->private_data;
 898
 899         return v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
 900 }
 901
 902 static int m2mtest_mmap(struct file *file, struct vm_area_struct *vma)
 903 {
 904         struct m2mtest_ctx *ctx = file->private_data;
 905
 906         return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
 907 }
 908
 909 static const struct v4l2_file_operations m2mtest_fops = {
 910         .owner          = THIS_MODULE,
 911         .open           = m2mtest_open,
 912         .release        = m2mtest_release,
 913         .poll           = m2mtest_poll,
 914         .unlocked_ioctl = video_ioctl2,
 915         .mmap           = m2mtest_mmap,
 916 };
 917
 918 static struct video_device m2mtest_videodev = {
 919         .name           = MEM2MEM_NAME,
 920         .fops           = &m2mtest_fops,
 921         .ioctl_ops      = &m2mtest_ioctl_ops,
 922         .minor          = -1,
 923         .release        = video_device_release,
 924 };
 925
 926 static struct v4l2_m2m_ops m2m_ops = {
 927         .device_run     = device_run,
 928         .job_ready      = job_ready,
 929         .job_abort      = job_abort,
 930         .lock           = m2mtest_lock,
 931         .unlock         = m2mtest_unlock,
 932 };
 933
 934 static int m2mtest_probe(struct platform_device *pdev)
 935 {
 936         struct m2mtest_dev *dev;
 937         struct video_device *vfd;
 938         int ret;
 939
 940         dev = kzalloc(sizeof *dev, GFP_KERNEL);
 941         if (!dev)
 942                 return -ENOMEM;
 943
 944         spin_lock_init(&dev->irqlock);
 945
 946         ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
 947         if (ret)
 948                 goto free_dev;
 949
 950         atomic_set(&dev->num_inst, 0);
 951         mutex_init(&dev->dev_mutex);
 952
 953         vfd = video_device_alloc();
 954         if (!vfd) {
 955                 v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
 956                 ret = -ENOMEM;
 957                 goto unreg_dev;
 958         }
 959
 960         *vfd = m2mtest_videodev;
 961         /* Locking in file operations other than ioctl should be done
 962            by the driver, not the V4L2 core.
 963            This driver needs auditing so that this flag can be removed. */
 964         set_bit(V4L2_FL_LOCK_ALL_FOPS, &vfd->flags);
 965         vfd->lock = &dev->dev_mutex;
 966
 967         ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
 968         if (ret) {
 969                 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
 970                 goto rel_vdev;
 971         }
 972
 973         video_set_drvdata(vfd, dev);
 974         snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name);
 975         dev->vfd = vfd;
 976         v4l2_info(&dev->v4l2_dev, MEM2MEM_TEST_MODULE_NAME
 977                         "Device registered as /dev/video%d\n", vfd->num);
 978
 979         setup_timer(&dev->timer, device_isr, (long)dev);
 980         platform_set_drvdata(pdev, dev);
 981
 982         dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
 983         if (IS_ERR(dev->m2m_dev)) {
 984                 v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
 985                 ret = PTR_ERR(dev->m2m_dev);
 986                 goto err_m2m;
 987         }
 988
 989         q_data[V4L2_M2M_SRC].fmt = &formats[0];
 990         q_data[V4L2_M2M_DST].fmt = &formats[0];
 991
 992         return 0;
 993
 994         v4l2_m2m_release(dev->m2m_dev);
 995 err_m2m:
 996         video_unregister_device(dev->vfd);
 997 rel_vdev:
 998         video_device_release(vfd);
 999 unreg_dev:
1000         v4l2_device_unregister(&dev->v4l2_dev);
1001 free_dev:
1002         kfree(dev);
1003
1004         return ret;
1005 }
1006
1007 static int m2mtest_remove(struct platform_device *pdev)
1008 {
1009         struct m2mtest_dev *dev =
1010                 (struct m2mtest_dev *)platform_get_drvdata(pdev);
1011
1012         v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME);
1013         v4l2_m2m_release(dev->m2m_dev);
1014         del_timer_sync(&dev->timer);
1015         video_unregister_device(dev->vfd);
1016         v4l2_device_unregister(&dev->v4l2_dev);
1017         kfree(dev);
1018
1019         return 0;
1020 }
1021
1022 static struct platform_driver m2mtest_pdrv = {
1023         .probe          = m2mtest_probe,
1024         .remove         = m2mtest_remove,
1025         .driver         = {
1026                 .name   = MEM2MEM_NAME,
1027                 .owner  = THIS_MODULE,
1028         },
1029 };
1030
1031 static void __exit m2mtest_exit(void)
1032 {
1033         platform_driver_unregister(&m2mtest_pdrv);
1034         platform_device_unregister(&m2mtest_pdev);
1035 }
1036
1037 static int __init m2mtest_init(void)
1038 {
1039         int ret;
1040
1041         ret = platform_device_register(&m2mtest_pdev);
1042         if (ret)
1043                 return ret;
1044
1045         ret = platform_driver_register(&m2mtest_pdrv);
1046         if (ret)
1047                 platform_device_unregister(&m2mtest_pdev);
1048
1049         return 0;
1050 }
1051
1052 module_init(m2mtest_init);
1053 module_exit(m2mtest_exit);
1054