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, <p.osciak@samsung.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/version.h>
  23 #include <linux/timer.h>
  24 #include <linux/sched.h>
  25 #include <linux/slab.h>
  26
  27 #include <linux/platform_device.h>
  28 #include <media/v4l2-mem2mem.h>
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-ioctl.h>
  31 #include <media/videobuf-vmalloc.h>
  32
  33 #define MEM2MEM_TEST_MODULE_NAME "mem2mem-testdev"
  34
  35 MODULE_DESCRIPTION("Virtual device for mem2mem framework testing");
  36 MODULE_AUTHOR("Pawel Osciak, <p.osciak@samsung.com>");
  37 MODULE_LICENSE("GPL");
  38
  39
  40 #define MIN_W 32
  41 #define MIN_H 32
  42 #define MAX_W 640
  43 #define MAX_H 480
  44 #define DIM_ALIGN_MASK 0x08 /* 8-alignment for dimensions */
  45
  46 /* Flags that indicate a format can be used for capture/output */
  47 #define MEM2MEM_CAPTURE (1 << 0)
  48 #define MEM2MEM_OUTPUT  (1 << 1)
  49
  50 #define MEM2MEM_NAME            "m2m-testdev"
  51
  52 /* Per queue */
  53 #define MEM2MEM_DEF_NUM_BUFS    VIDEO_MAX_FRAME
  54 /* In bytes, per queue */
  55 #define MEM2MEM_VID_MEM_LIMIT   (16 * 1024 * 1024)
  56
  57 /* Default transaction time in msec */
  58 #define MEM2MEM_DEF_TRANSTIME   1000
  59 /* Default number of buffers per transaction */
  60 #define MEM2MEM_DEF_TRANSLEN    1
  61 #define MEM2MEM_COLOR_STEP      (0xff >> 4)
  62 #define MEM2MEM_NUM_TILES       8
  63
  64 #define dprintk(dev, fmt, arg...) \
  65         v4l2_dbg(1, 1, &dev->v4l2_dev, "%s: " fmt, __func__, ## arg)
  66
  67
  68 void m2mtest_dev_release(struct device *dev)
  69 {}
  70
  71 static struct platform_device m2mtest_pdev = {
  72         .name           = MEM2MEM_NAME,
  73         .dev.release    = m2mtest_dev_release,
  74 };
  75
  76 struct m2mtest_fmt {
  77         char    *name;
  78         u32     fourcc;
  79         int     depth;
  80         /* Types the format can be used for */
  81         u32     types;
  82 };
  83
  84 static struct m2mtest_fmt formats[] = {
  85         {
  86                 .name   = "RGB565 (BE)",
  87                 .fourcc = V4L2_PIX_FMT_RGB565X, /* rrrrrggg gggbbbbb */
  88                 .depth  = 16,
  89                 /* Both capture and output format */
  90                 .types  = MEM2MEM_CAPTURE | MEM2MEM_OUTPUT,
  91         },
  92         {
  93                 .name   = "4:2:2, packed, YUYV",
  94                 .fourcc = V4L2_PIX_FMT_YUYV,
  95                 .depth  = 16,
  96                 /* Output-only format */
  97                 .types  = MEM2MEM_OUTPUT,
  98         },
  99 };
 100
 101 /* Per-queue, driver-specific private data */
 102 struct m2mtest_q_data {
 103         unsigned int            width;
 104         unsigned int            height;
 105         unsigned int            sizeimage;
 106         struct m2mtest_fmt      *fmt;
 107 };
 108
 109 enum {
 110         V4L2_M2M_SRC = 0,
 111         V4L2_M2M_DST = 1,
 112 };
 113
 114 /* Source and destination queue data */
 115 static struct m2mtest_q_data q_data[2];
 116
 117 static struct m2mtest_q_data *get_q_data(enum v4l2_buf_type type)
 118 {
 119         switch (type) {
 120         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
 121                 return &q_data[V4L2_M2M_SRC];
 122         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 123                 return &q_data[V4L2_M2M_DST];
 124         default:
 125                 BUG();
 126         }
 127         return NULL;
 128 }
 129
 130 #define V4L2_CID_TRANS_TIME_MSEC        V4L2_CID_PRIVATE_BASE
 131 #define V4L2_CID_TRANS_NUM_BUFS         (V4L2_CID_PRIVATE_BASE + 1)
 132
 133 static struct v4l2_queryctrl m2mtest_ctrls[] = {
 134         {
 135                 .id             = V4L2_CID_TRANS_TIME_MSEC,
 136                 .type           = V4L2_CTRL_TYPE_INTEGER,
 137                 .name           = "Transaction time (msec)",
 138                 .minimum        = 1,
 139                 .maximum        = 10000,
 140                 .step           = 100,
 141                 .default_value  = 1000,
 142                 .flags          = 0,
 143         }, {
 144                 .id             = V4L2_CID_TRANS_NUM_BUFS,
 145                 .type           = V4L2_CTRL_TYPE_INTEGER,
 146                 .name           = "Buffers per transaction",
 147                 .minimum        = 1,
 148                 .maximum        = MEM2MEM_DEF_NUM_BUFS,
 149                 .step           = 1,
 150                 .default_value  = 1,
 151                 .flags          = 0,
 152         },
 153 };
 154
 155 #define NUM_FORMATS ARRAY_SIZE(formats)
 156
 157 static struct m2mtest_fmt *find_format(struct v4l2_format *f)
 158 {
 159         struct m2mtest_fmt *fmt;
 160         unsigned int k;
 161
 162         for (k = 0; k < NUM_FORMATS; k++) {
 163                 fmt = &formats[k];
 164                 if (fmt->fourcc == f->fmt.pix.pixelformat)
 165                         break;
 166         }
 167
 168         if (k == NUM_FORMATS)
 169                 return NULL;
 170
 171         return &formats[k];
 172 }
 173
 174 struct m2mtest_dev {
 175         struct v4l2_device      v4l2_dev;
 176         struct video_device     *vfd;
 177
 178         atomic_t                num_inst;
 179         struct mutex            dev_mutex;
 180         spinlock_t              irqlock;
 181
 182         struct timer_list       timer;
 183
 184         struct v4l2_m2m_dev     *m2m_dev;
 185 };
 186
 187 struct m2mtest_ctx {
 188         struct m2mtest_dev      *dev;
 189
 190         /* Processed buffers in this transaction */
 191         u8                      num_processed;
 192
 193         /* Transaction length (i.e. how many buffers per transaction) */
 194         u32                     translen;
 195         /* Transaction time (i.e. simulated processing time) in milliseconds */
 196         u32                     transtime;
 197
 198         /* Abort requested by m2m */
 199         int                     aborting;
 200
 201         struct v4l2_m2m_ctx     *m2m_ctx;
 202 };
 203
 204 struct m2mtest_buffer {
 205         /* vb must be first! */
 206         struct videobuf_buffer  vb;
 207 };
 208
 209 static struct v4l2_queryctrl *get_ctrl(int id)
 210 {
 211         int i;
 212
 213         for (i = 0; i < ARRAY_SIZE(m2mtest_ctrls); ++i) {
 214                 if (id == m2mtest_ctrls[i].id)
 215                         return &m2mtest_ctrls[i];
 216         }
 217
 218         return NULL;
 219 }
 220
 221 static int device_process(struct m2mtest_ctx *ctx,
 222                           struct m2mtest_buffer *in_buf,
 223                           struct m2mtest_buffer *out_buf)
 224 {
 225         struct m2mtest_dev *dev = ctx->dev;
 226         u8 *p_in, *p_out;
 227         int x, y, t, w;
 228         int tile_w, bytes_left;
 229         struct videobuf_queue *src_q;
 230         struct videobuf_queue *dst_q;
 231
 232         src_q = v4l2_m2m_get_src_vq(ctx->m2m_ctx);
 233         dst_q = v4l2_m2m_get_dst_vq(ctx->m2m_ctx);
 234         p_in = videobuf_queue_to_vaddr(src_q, &in_buf->vb);
 235         p_out = videobuf_queue_to_vaddr(dst_q, &out_buf->vb);
 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 (in_buf->vb.size > out_buf->vb.size) {
 243                 v4l2_err(&dev->v4l2_dev, "Output buffer is too small\n");
 244                 return -EINVAL;
 245         }
 246
 247         tile_w = (in_buf->vb.width * (q_data[V4L2_M2M_DST].fmt->depth >> 3))
 248                 / MEM2MEM_NUM_TILES;
 249         bytes_left = in_buf->vb.bytesperline - tile_w * MEM2MEM_NUM_TILES;
 250         w = 0;
 251
 252         for (y = 0; y < in_buf->vb.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 /* device_run() - prepares and starts the device
 305  *
 306  * This simulates all the immediate preparations required before starting
 307  * a device. This will be called by the framework when it decides to schedule
 308  * a particular instance.
 309  */
 310 static void device_run(void *priv)
 311 {
 312         struct m2mtest_ctx *ctx = priv;
 313         struct m2mtest_dev *dev = ctx->dev;
 314         struct m2mtest_buffer *src_buf, *dst_buf;
 315
 316         src_buf = v4l2_m2m_next_src_buf(ctx->m2m_ctx);
 317         dst_buf = v4l2_m2m_next_dst_buf(ctx->m2m_ctx);
 318
 319         device_process(ctx, src_buf, dst_buf);
 320
 321         /* Run a timer, which simulates a hardware irq  */
 322         schedule_irq(dev, ctx->transtime);
 323 }
 324
 325
 326 static void device_isr(unsigned long priv)
 327 {
 328         struct m2mtest_dev *m2mtest_dev = (struct m2mtest_dev *)priv;
 329         struct m2mtest_ctx *curr_ctx;
 330         struct m2mtest_buffer *src_buf, *dst_buf;
 331         unsigned long flags;
 332
 333         curr_ctx = v4l2_m2m_get_curr_priv(m2mtest_dev->m2m_dev);
 334
 335         if (NULL == curr_ctx) {
 336                 printk(KERN_ERR
 337                         "Instance released before the end of transaction\n");
 338                 return;
 339         }
 340
 341         src_buf = v4l2_m2m_src_buf_remove(curr_ctx->m2m_ctx);
 342         dst_buf = v4l2_m2m_dst_buf_remove(curr_ctx->m2m_ctx);
 343         curr_ctx->num_processed++;
 344
 345         if (curr_ctx->num_processed == curr_ctx->translen
 346             || curr_ctx->aborting) {
 347                 dprintk(curr_ctx->dev, "Finishing transaction\n");
 348                 curr_ctx->num_processed = 0;
 349                 spin_lock_irqsave(&m2mtest_dev->irqlock, flags);
 350                 src_buf->vb.state = dst_buf->vb.state = VIDEOBUF_DONE;
 351                 wake_up(&src_buf->vb.done);
 352                 wake_up(&dst_buf->vb.done);
 353                 spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags);
 354                 v4l2_m2m_job_finish(m2mtest_dev->m2m_dev, curr_ctx->m2m_ctx);
 355         } else {
 356                 spin_lock_irqsave(&m2mtest_dev->irqlock, flags);
 357                 src_buf->vb.state = dst_buf->vb.state = VIDEOBUF_DONE;
 358                 wake_up(&src_buf->vb.done);
 359                 wake_up(&dst_buf->vb.done);
 360                 spin_unlock_irqrestore(&m2mtest_dev->irqlock, flags);
 361                 device_run(curr_ctx);
 362         }
 363 }
 364
 365
 366 /*
 367  * video ioctls
 368  */
 369 static int vidioc_querycap(struct file *file, void *priv,
 370                            struct v4l2_capability *cap)
 371 {
 372         strncpy(cap->driver, MEM2MEM_NAME, sizeof(cap->driver) - 1);
 373         strncpy(cap->card, MEM2MEM_NAME, sizeof(cap->card) - 1);
 374         cap->bus_info[0] = 0;
 375         cap->version = KERNEL_VERSION(0, 1, 0);
 376         cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT
 377                           | V4L2_CAP_STREAMING;
 378
 379         return 0;
 380 }
 381
 382 static int enum_fmt(struct v4l2_fmtdesc *f, u32 type)
 383 {
 384         int i, num;
 385         struct m2mtest_fmt *fmt;
 386
 387         num = 0;
 388
 389         for (i = 0; i < NUM_FORMATS; ++i) {
 390                 if (formats[i].types & type) {
 391                         /* index-th format of type type found ? */
 392                         if (num == f->index)
 393                                 break;
 394                         /* Correct type but haven't reached our index yet,
 395                          * just increment per-type index */
 396                         ++num;
 397                 }
 398         }
 399
 400         if (i < NUM_FORMATS) {
 401                 /* Format found */
 402                 fmt = &formats[i];
 403                 strncpy(f->description, fmt->name, sizeof(f->description) - 1);
 404                 f->pixelformat = fmt->fourcc;
 405                 return 0;
 406         }
 407
 408         /* Format not found */
 409         return -EINVAL;
 410 }
 411
 412 static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
 413                                    struct v4l2_fmtdesc *f)
 414 {
 415         return enum_fmt(f, MEM2MEM_CAPTURE);
 416 }
 417
 418 static int vidioc_enum_fmt_vid_out(struct file *file, void *priv,
 419                                    struct v4l2_fmtdesc *f)
 420 {
 421         return enum_fmt(f, MEM2MEM_OUTPUT);
 422 }
 423
 424 static int vidioc_g_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
 425 {
 426         struct videobuf_queue *vq;
 427         struct m2mtest_q_data *q_data;
 428
 429         vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
 430         if (!vq)
 431                 return -EINVAL;
 432
 433         q_data = get_q_data(f->type);
 434
 435         f->fmt.pix.width        = q_data->width;
 436         f->fmt.pix.height       = q_data->height;
 437         f->fmt.pix.field        = vq->field;
 438         f->fmt.pix.pixelformat  = q_data->fmt->fourcc;
 439         f->fmt.pix.bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
 440         f->fmt.pix.sizeimage    = q_data->sizeimage;
 441
 442         return 0;
 443 }
 444
 445 static int vidioc_g_fmt_vid_out(struct file *file, void *priv,
 446                                 struct v4l2_format *f)
 447 {
 448         return vidioc_g_fmt(priv, f);
 449 }
 450
 451 static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 452                                 struct v4l2_format *f)
 453 {
 454         return vidioc_g_fmt(priv, f);
 455 }
 456
 457 static int vidioc_try_fmt(struct v4l2_format *f, struct m2mtest_fmt *fmt)
 458 {
 459         enum v4l2_field field;
 460
 461         field = f->fmt.pix.field;
 462
 463         if (field == V4L2_FIELD_ANY)
 464                 field = V4L2_FIELD_NONE;
 465         else if (V4L2_FIELD_NONE != field)
 466                 return -EINVAL;
 467
 468         /* V4L2 specification suggests the driver corrects the format struct
 469          * if any of the dimensions is unsupported */
 470         f->fmt.pix.field = field;
 471
 472         if (f->fmt.pix.height < MIN_H)
 473                 f->fmt.pix.height = MIN_H;
 474         else if (f->fmt.pix.height > MAX_H)
 475                 f->fmt.pix.height = MAX_H;
 476
 477         if (f->fmt.pix.width < MIN_W)
 478                 f->fmt.pix.width = MIN_W;
 479         else if (f->fmt.pix.width > MAX_W)
 480                 f->fmt.pix.width = MAX_W;
 481
 482         f->fmt.pix.width &= ~DIM_ALIGN_MASK;
 483         f->fmt.pix.bytesperline = (f->fmt.pix.width * fmt->depth) >> 3;
 484         f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
 485
 486         return 0;
 487 }
 488
 489 static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 490                                   struct v4l2_format *f)
 491 {
 492         struct m2mtest_fmt *fmt;
 493         struct m2mtest_ctx *ctx = priv;
 494
 495         fmt = find_format(f);
 496         if (!fmt || !(fmt->types & MEM2MEM_CAPTURE)) {
 497                 v4l2_err(&ctx->dev->v4l2_dev,
 498                          "Fourcc format (0x%08x) invalid.\n",
 499                          f->fmt.pix.pixelformat);
 500                 return -EINVAL;
 501         }
 502
 503         return vidioc_try_fmt(f, fmt);
 504 }
 505
 506 static int vidioc_try_fmt_vid_out(struct file *file, void *priv,
 507                                   struct v4l2_format *f)
 508 {
 509         struct m2mtest_fmt *fmt;
 510         struct m2mtest_ctx *ctx = priv;
 511
 512         fmt = find_format(f);
 513         if (!fmt || !(fmt->types & MEM2MEM_OUTPUT)) {
 514                 v4l2_err(&ctx->dev->v4l2_dev,
 515                          "Fourcc format (0x%08x) invalid.\n",
 516                          f->fmt.pix.pixelformat);
 517                 return -EINVAL;
 518         }
 519
 520         return vidioc_try_fmt(f, fmt);
 521 }
 522
 523 static int vidioc_s_fmt(struct m2mtest_ctx *ctx, struct v4l2_format *f)
 524 {
 525         struct m2mtest_q_data *q_data;
 526         struct videobuf_queue *vq;
 527         int ret = 0;
 528
 529         vq = v4l2_m2m_get_vq(ctx->m2m_ctx, f->type);
 530         if (!vq)
 531                 return -EINVAL;
 532
 533         q_data = get_q_data(f->type);
 534         if (!q_data)
 535                 return -EINVAL;
 536
 537         mutex_lock(&vq->vb_lock);
 538
 539         if (videobuf_queue_is_busy(vq)) {
 540                 v4l2_err(&ctx->dev->v4l2_dev, "%s queue busy\n", __func__);
 541                 ret = -EBUSY;
 542                 goto out;
 543         }
 544
 545         q_data->fmt             = find_format(f);
 546         q_data->width           = f->fmt.pix.width;
 547         q_data->height          = f->fmt.pix.height;
 548         q_data->sizeimage       = q_data->width * q_data->height
 549                                 * q_data->fmt->depth >> 3;
 550         vq->field               = f->fmt.pix.field;
 551
 552         dprintk(ctx->dev,
 553                 "Setting format for type %d, wxh: %dx%d, fmt: %d\n",
 554                 f->type, q_data->width, q_data->height, q_data->fmt->fourcc);
 555
 556 out:
 557         mutex_unlock(&vq->vb_lock);
 558         return ret;
 559 }
 560
 561 static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 562                                 struct v4l2_format *f)
 563 {
 564         int ret;
 565
 566         ret = vidioc_try_fmt_vid_cap(file, priv, f);
 567         if (ret)
 568                 return ret;
 569
 570         return vidioc_s_fmt(priv, f);
 571 }
 572
 573 static int vidioc_s_fmt_vid_out(struct file *file, void *priv,
 574                                 struct v4l2_format *f)
 575 {
 576         int ret;
 577
 578         ret = vidioc_try_fmt_vid_out(file, priv, f);
 579         if (ret)
 580                 return ret;
 581
 582         return vidioc_s_fmt(priv, f);
 583 }
 584
 585 static int vidioc_reqbufs(struct file *file, void *priv,
 586                           struct v4l2_requestbuffers *reqbufs)
 587 {
 588         struct m2mtest_ctx *ctx = priv;
 589
 590         return v4l2_m2m_reqbufs(file, ctx->m2m_ctx, reqbufs);
 591 }
 592
 593 static int vidioc_querybuf(struct file *file, void *priv,
 594                            struct v4l2_buffer *buf)
 595 {
 596         struct m2mtest_ctx *ctx = priv;
 597
 598         return v4l2_m2m_querybuf(file, ctx->m2m_ctx, buf);
 599 }
 600
 601 static int vidioc_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 602 {
 603         struct m2mtest_ctx *ctx = priv;
 604
 605         return v4l2_m2m_qbuf(file, ctx->m2m_ctx, buf);
 606 }
 607
 608 static int vidioc_dqbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 609 {
 610         struct m2mtest_ctx *ctx = priv;
 611
 612         return v4l2_m2m_dqbuf(file, ctx->m2m_ctx, buf);
 613 }
 614
 615 static int vidioc_streamon(struct file *file, void *priv,
 616                            enum v4l2_buf_type type)
 617 {
 618         struct m2mtest_ctx *ctx = priv;
 619
 620         return v4l2_m2m_streamon(file, ctx->m2m_ctx, type);
 621 }
 622
 623 static int vidioc_streamoff(struct file *file, void *priv,
 624                             enum v4l2_buf_type type)
 625 {
 626         struct m2mtest_ctx *ctx = priv;
 627
 628         return v4l2_m2m_streamoff(file, ctx->m2m_ctx, type);
 629 }
 630
 631 static int vidioc_queryctrl(struct file *file, void *priv,
 632                             struct v4l2_queryctrl *qc)
 633 {
 634         struct v4l2_queryctrl *c;
 635
 636         c = get_ctrl(qc->id);
 637         if (!c)
 638                 return -EINVAL;
 639
 640         *qc = *c;
 641         return 0;
 642 }
 643
 644 static int vidioc_g_ctrl(struct file *file, void *priv,
 645                          struct v4l2_control *ctrl)
 646 {
 647         struct m2mtest_ctx *ctx = priv;
 648
 649         switch (ctrl->id) {
 650         case V4L2_CID_TRANS_TIME_MSEC:
 651                 ctrl->value = ctx->transtime;
 652                 break;
 653
 654         case V4L2_CID_TRANS_NUM_BUFS:
 655                 ctrl->value = ctx->translen;
 656                 break;
 657
 658         default:
 659                 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
 660                 return -EINVAL;
 661         }
 662
 663         return 0;
 664 }
 665
 666 static int check_ctrl_val(struct m2mtest_ctx *ctx, struct v4l2_control *ctrl)
 667 {
 668         struct v4l2_queryctrl *c;
 669
 670         c = get_ctrl(ctrl->id);
 671         if (!c)
 672                 return -EINVAL;
 673
 674         if (ctrl->value < c->minimum || ctrl->value > c->maximum) {
 675                 v4l2_err(&ctx->dev->v4l2_dev, "Value out of range\n");
 676                 return -ERANGE;
 677         }
 678
 679         return 0;
 680 }
 681
 682 static int vidioc_s_ctrl(struct file *file, void *priv,
 683                          struct v4l2_control *ctrl)
 684 {
 685         struct m2mtest_ctx *ctx = priv;
 686         int ret = 0;
 687
 688         ret = check_ctrl_val(ctx, ctrl);
 689         if (ret != 0)
 690                 return ret;
 691
 692         switch (ctrl->id) {
 693         case V4L2_CID_TRANS_TIME_MSEC:
 694                 ctx->transtime = ctrl->value;
 695                 break;
 696
 697         case V4L2_CID_TRANS_NUM_BUFS:
 698                 ctx->translen = ctrl->value;
 699                 break;
 700
 701         default:
 702                 v4l2_err(&ctx->dev->v4l2_dev, "Invalid control\n");
 703                 return -EINVAL;
 704         }
 705
 706         return 0;
 707 }
 708
 709
 710 static const struct v4l2_ioctl_ops m2mtest_ioctl_ops = {
 711         .vidioc_querycap        = vidioc_querycap,
 712
 713         .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
 714         .vidioc_g_fmt_vid_cap   = vidioc_g_fmt_vid_cap,
 715         .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
 716         .vidioc_s_fmt_vid_cap   = vidioc_s_fmt_vid_cap,
 717
 718         .vidioc_enum_fmt_vid_out = vidioc_enum_fmt_vid_out,
 719         .vidioc_g_fmt_vid_out   = vidioc_g_fmt_vid_out,
 720         .vidioc_try_fmt_vid_out = vidioc_try_fmt_vid_out,
 721         .vidioc_s_fmt_vid_out   = vidioc_s_fmt_vid_out,
 722
 723         .vidioc_reqbufs         = vidioc_reqbufs,
 724         .vidioc_querybuf        = vidioc_querybuf,
 725
 726         .vidioc_qbuf            = vidioc_qbuf,
 727         .vidioc_dqbuf           = vidioc_dqbuf,
 728
 729         .vidioc_streamon        = vidioc_streamon,
 730         .vidioc_streamoff       = vidioc_streamoff,
 731
 732         .vidioc_queryctrl       = vidioc_queryctrl,
 733         .vidioc_g_ctrl          = vidioc_g_ctrl,
 734         .vidioc_s_ctrl          = vidioc_s_ctrl,
 735 };
 736
 737
 738 /*
 739  * Queue operations
 740  */
 741
 742 static void m2mtest_buf_release(struct videobuf_queue *vq,
 743                                 struct videobuf_buffer *vb)
 744 {
 745         struct m2mtest_ctx *ctx = vq->priv_data;
 746
 747         dprintk(ctx->dev, "type: %d, index: %d, state: %d\n",
 748                 vq->type, vb->i, vb->state);
 749
 750         videobuf_vmalloc_free(vb);
 751         vb->state = VIDEOBUF_NEEDS_INIT;
 752 }
 753
 754 static int m2mtest_buf_setup(struct videobuf_queue *vq, unsigned int *count,
 755                           unsigned int *size)
 756 {
 757         struct m2mtest_ctx *ctx = vq->priv_data;
 758         struct m2mtest_q_data *q_data;
 759
 760         q_data = get_q_data(vq->type);
 761
 762         *size = q_data->width * q_data->height * q_data->fmt->depth >> 3;
 763         dprintk(ctx->dev, "size:%d, w/h %d/%d, depth: %d\n",
 764                 *size, q_data->width, q_data->height, q_data->fmt->depth);
 765
 766         if (0 == *count)
 767                 *count = MEM2MEM_DEF_NUM_BUFS;
 768
 769         while (*size * *count > MEM2MEM_VID_MEM_LIMIT)
 770                 (*count)--;
 771
 772         v4l2_info(&ctx->dev->v4l2_dev,
 773                   "%d buffers of size %d set up.\n", *count, *size);
 774
 775         return 0;
 776 }
 777
 778 static int m2mtest_buf_prepare(struct videobuf_queue *vq,
 779                                struct videobuf_buffer *vb,
 780                                enum v4l2_field field)
 781 {
 782         struct m2mtest_ctx *ctx = vq->priv_data;
 783         struct m2mtest_q_data *q_data;
 784         int ret;
 785
 786         dprintk(ctx->dev, "type: %d, index: %d, state: %d\n",
 787                 vq->type, vb->i, vb->state);
 788
 789         q_data = get_q_data(vq->type);
 790
 791         if (vb->baddr) {
 792                 /* User-provided buffer */
 793                 if (vb->bsize < q_data->sizeimage) {
 794                         /* Buffer too small to fit a frame */
 795                         v4l2_err(&ctx->dev->v4l2_dev,
 796                                  "User-provided buffer too small\n");
 797                         return -EINVAL;
 798                 }
 799         } else if (vb->state != VIDEOBUF_NEEDS_INIT
 800                         && vb->bsize < q_data->sizeimage) {
 801                 /* We provide the buffer, but it's already been initialized
 802                  * and is too small */
 803                 return -EINVAL;
 804         }
 805
 806         vb->width       = q_data->width;
 807         vb->height      = q_data->height;
 808         vb->bytesperline = (q_data->width * q_data->fmt->depth) >> 3;
 809         vb->size        = q_data->sizeimage;
 810         vb->field       = field;
 811
 812         if (VIDEOBUF_NEEDS_INIT == vb->state) {
 813                 ret = videobuf_iolock(vq, vb, NULL);
 814                 if (ret) {
 815                         v4l2_err(&ctx->dev->v4l2_dev,
 816                                  "Iolock failed\n");
 817                         goto fail;
 818                 }
 819         }
 820
 821         vb->state = VIDEOBUF_PREPARED;
 822
 823         return 0;
 824 fail:
 825         m2mtest_buf_release(vq, vb);
 826         return ret;
 827 }
 828
 829 static void m2mtest_buf_queue(struct videobuf_queue *vq,
 830                            struct videobuf_buffer *vb)
 831 {
 832         struct m2mtest_ctx *ctx = vq->priv_data;
 833
 834         v4l2_m2m_buf_queue(ctx->m2m_ctx, vq, vb);
 835 }
 836
 837 static struct videobuf_queue_ops m2mtest_qops = {
 838         .buf_setup      = m2mtest_buf_setup,
 839         .buf_prepare    = m2mtest_buf_prepare,
 840         .buf_queue      = m2mtest_buf_queue,
 841         .buf_release    = m2mtest_buf_release,
 842 };
 843
 844 static void queue_init(void *priv, struct videobuf_queue *vq,
 845                        enum v4l2_buf_type type)
 846 {
 847         struct m2mtest_ctx *ctx = priv;
 848
 849         videobuf_queue_vmalloc_init(vq, &m2mtest_qops, ctx->dev->v4l2_dev.dev,
 850                                     &ctx->dev->irqlock, type, V4L2_FIELD_NONE,
 851                                     sizeof(struct m2mtest_buffer), priv);
 852 }
 853
 854
 855 /*
 856  * File operations
 857  */
 858 static int m2mtest_open(struct file *file)
 859 {
 860         struct m2mtest_dev *dev = video_drvdata(file);
 861         struct m2mtest_ctx *ctx = NULL;
 862
 863         ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
 864         if (!ctx)
 865                 return -ENOMEM;
 866
 867         file->private_data = ctx;
 868         ctx->dev = dev;
 869         ctx->translen = MEM2MEM_DEF_TRANSLEN;
 870         ctx->transtime = MEM2MEM_DEF_TRANSTIME;
 871         ctx->num_processed = 0;
 872
 873         ctx->m2m_ctx = v4l2_m2m_ctx_init(ctx, dev->m2m_dev, queue_init);
 874         if (IS_ERR(ctx->m2m_ctx)) {
 875                 int ret = PTR_ERR(ctx->m2m_ctx);
 876
 877                 kfree(ctx);
 878                 return ret;
 879         }
 880
 881         atomic_inc(&dev->num_inst);
 882
 883         dprintk(dev, "Created instance %p, m2m_ctx: %p\n", ctx, ctx->m2m_ctx);
 884
 885         return 0;
 886 }
 887
 888 static int m2mtest_release(struct file *file)
 889 {
 890         struct m2mtest_dev *dev = video_drvdata(file);
 891         struct m2mtest_ctx *ctx = file->private_data;
 892
 893         dprintk(dev, "Releasing instance %p\n", ctx);
 894
 895         v4l2_m2m_ctx_release(ctx->m2m_ctx);
 896         kfree(ctx);
 897
 898         atomic_dec(&dev->num_inst);
 899
 900         return 0;
 901 }
 902
 903 static unsigned int m2mtest_poll(struct file *file,
 904                                  struct poll_table_struct *wait)
 905 {
 906         struct m2mtest_ctx *ctx = file->private_data;
 907
 908         return v4l2_m2m_poll(file, ctx->m2m_ctx, wait);
 909 }
 910
 911 static int m2mtest_mmap(struct file *file, struct vm_area_struct *vma)
 912 {
 913         struct m2mtest_ctx *ctx = file->private_data;
 914
 915         return v4l2_m2m_mmap(file, ctx->m2m_ctx, vma);
 916 }
 917
 918 static const struct v4l2_file_operations m2mtest_fops = {
 919         .owner          = THIS_MODULE,
 920         .open           = m2mtest_open,
 921         .release        = m2mtest_release,
 922         .poll           = m2mtest_poll,
 923         .ioctl          = video_ioctl2,
 924         .mmap           = m2mtest_mmap,
 925 };
 926
 927 static struct video_device m2mtest_videodev = {
 928         .name           = MEM2MEM_NAME,
 929         .fops           = &m2mtest_fops,
 930         .ioctl_ops      = &m2mtest_ioctl_ops,
 931         .minor          = -1,
 932         .release        = video_device_release,
 933 };
 934
 935 static struct v4l2_m2m_ops m2m_ops = {
 936         .device_run     = device_run,
 937         .job_ready      = job_ready,
 938         .job_abort      = job_abort,
 939 };
 940
 941 static int m2mtest_probe(struct platform_device *pdev)
 942 {
 943         struct m2mtest_dev *dev;
 944         struct video_device *vfd;
 945         int ret;
 946
 947         dev = kzalloc(sizeof *dev, GFP_KERNEL);
 948         if (!dev)
 949                 return -ENOMEM;
 950
 951         spin_lock_init(&dev->irqlock);
 952
 953         ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
 954         if (ret)
 955                 goto free_dev;
 956
 957         atomic_set(&dev->num_inst, 0);
 958         mutex_init(&dev->dev_mutex);
 959
 960         vfd = video_device_alloc();
 961         if (!vfd) {
 962                 v4l2_err(&dev->v4l2_dev, "Failed to allocate video device\n");
 963                 ret = -ENOMEM;
 964                 goto unreg_dev;
 965         }
 966
 967         *vfd = m2mtest_videodev;
 968
 969         ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
 970         if (ret) {
 971                 v4l2_err(&dev->v4l2_dev, "Failed to register video device\n");
 972                 goto rel_vdev;
 973         }
 974
 975         video_set_drvdata(vfd, dev);
 976         snprintf(vfd->name, sizeof(vfd->name), "%s", m2mtest_videodev.name);
 977         dev->vfd = vfd;
 978         v4l2_info(&dev->v4l2_dev, MEM2MEM_TEST_MODULE_NAME
 979                         "Device registered as /dev/video%d\n", vfd->num);
 980
 981         setup_timer(&dev->timer, device_isr, (long)dev);
 982         platform_set_drvdata(pdev, dev);
 983
 984         dev->m2m_dev = v4l2_m2m_init(&m2m_ops);
 985         if (IS_ERR(dev->m2m_dev)) {
 986                 v4l2_err(&dev->v4l2_dev, "Failed to init mem2mem device\n");
 987                 ret = PTR_ERR(dev->m2m_dev);
 988                 goto err_m2m;
 989         }
 990
 991         q_data[V4L2_M2M_SRC].fmt = &formats[0];
 992         q_data[V4L2_M2M_DST].fmt = &formats[0];
 993
 994         return 0;
 995
 996 err_m2m:
 997         video_unregister_device(dev->vfd);
 998 rel_vdev:
 999         video_device_release(vfd);
1000 unreg_dev:
1001         v4l2_device_unregister(&dev->v4l2_dev);
1002 free_dev:
1003         kfree(dev);
1004
1005         return ret;
1006 }
1007
1008 static int m2mtest_remove(struct platform_device *pdev)
1009 {
1010         struct m2mtest_dev *dev =
1011                 (struct m2mtest_dev *)platform_get_drvdata(pdev);
1012
1013         v4l2_info(&dev->v4l2_dev, "Removing " MEM2MEM_TEST_MODULE_NAME);
1014         v4l2_m2m_release(dev->m2m_dev);
1015         del_timer_sync(&dev->timer);
1016         video_unregister_device(dev->vfd);
1017         video_device_release(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