linux/drivers/media/platform/vsp1/vsp1_histo.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * vsp1_histo.c  --  R-Car VSP1 Histogram API
   4 *
   5 * Copyright (C) 2016 Renesas Electronics Corporation
   6 * Copyright (C) 2016 Laurent Pinchart
   7 *
   8 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   9 */
  10
  11#include <linux/device.h>
  12#include <linux/gfp.h>
  13
  14#include <media/v4l2-ioctl.h>
  15#include <media/v4l2-subdev.h>
  16#include <media/videobuf2-vmalloc.h>
  17
  18#include "vsp1.h"
  19#include "vsp1_histo.h"
  20#include "vsp1_pipe.h"
  21
  22#define HISTO_MIN_SIZE                          4U
  23#define HISTO_MAX_SIZE                          8192U
  24
  25/* -----------------------------------------------------------------------------
  26 * Buffer Operations
  27 */
  28
  29static inline struct vsp1_histogram_buffer *
  30to_vsp1_histogram_buffer(struct vb2_v4l2_buffer *vbuf)
  31{
  32        return container_of(vbuf, struct vsp1_histogram_buffer, buf);
  33}
  34
  35struct vsp1_histogram_buffer *
  36vsp1_histogram_buffer_get(struct vsp1_histogram *histo)
  37{
  38        struct vsp1_histogram_buffer *buf = NULL;
  39        unsigned long flags;
  40
  41        spin_lock_irqsave(&histo->irqlock, flags);
  42
  43        if (list_empty(&histo->irqqueue))
  44                goto done;
  45
  46        buf = list_first_entry(&histo->irqqueue, struct vsp1_histogram_buffer,
  47                               queue);
  48        list_del(&buf->queue);
  49        histo->readout = true;
  50
  51done:
  52        spin_unlock_irqrestore(&histo->irqlock, flags);
  53        return buf;
  54}
  55
  56void vsp1_histogram_buffer_complete(struct vsp1_histogram *histo,
  57                                    struct vsp1_histogram_buffer *buf,
  58                                    size_t size)
  59{
  60        struct vsp1_pipeline *pipe = histo->entity.pipe;
  61        unsigned long flags;
  62
  63        /*
  64         * The pipeline pointer is guaranteed to be valid as this function is
  65         * called from the frame completion interrupt handler, which can only
  66         * occur when video streaming is active.
  67         */
  68        buf->buf.sequence = pipe->sequence;
  69        buf->buf.vb2_buf.timestamp = ktime_get_ns();
  70        vb2_set_plane_payload(&buf->buf.vb2_buf, 0, size);
  71        vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE);
  72
  73        spin_lock_irqsave(&histo->irqlock, flags);
  74        histo->readout = false;
  75        wake_up(&histo->wait_queue);
  76        spin_unlock_irqrestore(&histo->irqlock, flags);
  77}
  78
  79/* -----------------------------------------------------------------------------
  80 * videobuf2 Queue Operations
  81 */
  82
  83static int histo_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
  84                             unsigned int *nplanes, unsigned int sizes[],
  85                             struct device *alloc_devs[])
  86{
  87        struct vsp1_histogram *histo = vb2_get_drv_priv(vq);
  88
  89        if (*nplanes) {
  90                if (*nplanes != 1)
  91                        return -EINVAL;
  92
  93                if (sizes[0] < histo->data_size)
  94                        return -EINVAL;
  95
  96                return 0;
  97        }
  98
  99        *nplanes = 1;
 100        sizes[0] = histo->data_size;
 101
 102        return 0;
 103}
 104
 105static int histo_buffer_prepare(struct vb2_buffer *vb)
 106{
 107        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 108        struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue);
 109        struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf);
 110
 111        if (vb->num_planes != 1)
 112                return -EINVAL;
 113
 114        if (vb2_plane_size(vb, 0) < histo->data_size)
 115                return -EINVAL;
 116
 117        buf->addr = vb2_plane_vaddr(vb, 0);
 118
 119        return 0;
 120}
 121
 122static void histo_buffer_queue(struct vb2_buffer *vb)
 123{
 124        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 125        struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue);
 126        struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf);
 127        unsigned long flags;
 128
 129        spin_lock_irqsave(&histo->irqlock, flags);
 130        list_add_tail(&buf->queue, &histo->irqqueue);
 131        spin_unlock_irqrestore(&histo->irqlock, flags);
 132}
 133
 134static int histo_start_streaming(struct vb2_queue *vq, unsigned int count)
 135{
 136        return 0;
 137}
 138
 139static void histo_stop_streaming(struct vb2_queue *vq)
 140{
 141        struct vsp1_histogram *histo = vb2_get_drv_priv(vq);
 142        struct vsp1_histogram_buffer *buffer;
 143        unsigned long flags;
 144
 145        spin_lock_irqsave(&histo->irqlock, flags);
 146
 147        /* Remove all buffers from the IRQ queue. */
 148        list_for_each_entry(buffer, &histo->irqqueue, queue)
 149                vb2_buffer_done(&buffer->buf.vb2_buf, VB2_BUF_STATE_ERROR);
 150        INIT_LIST_HEAD(&histo->irqqueue);
 151
 152        /* Wait for the buffer being read out (if any) to complete. */
 153        wait_event_lock_irq(histo->wait_queue, !histo->readout, histo->irqlock);
 154
 155        spin_unlock_irqrestore(&histo->irqlock, flags);
 156}
 157
 158static const struct vb2_ops histo_video_queue_qops = {
 159        .queue_setup = histo_queue_setup,
 160        .buf_prepare = histo_buffer_prepare,
 161        .buf_queue = histo_buffer_queue,
 162        .wait_prepare = vb2_ops_wait_prepare,
 163        .wait_finish = vb2_ops_wait_finish,
 164        .start_streaming = histo_start_streaming,
 165        .stop_streaming = histo_stop_streaming,
 166};
 167
 168/* -----------------------------------------------------------------------------
 169 * V4L2 Subdevice Operations
 170 */
 171
 172static int histo_enum_mbus_code(struct v4l2_subdev *subdev,
 173                                struct v4l2_subdev_pad_config *cfg,
 174                                struct v4l2_subdev_mbus_code_enum *code)
 175{
 176        struct vsp1_histogram *histo = subdev_to_histo(subdev);
 177
 178        if (code->pad == HISTO_PAD_SOURCE) {
 179                code->code = MEDIA_BUS_FMT_FIXED;
 180                return 0;
 181        }
 182
 183        return vsp1_subdev_enum_mbus_code(subdev, cfg, code, histo->formats,
 184                                          histo->num_formats);
 185}
 186
 187static int histo_enum_frame_size(struct v4l2_subdev *subdev,
 188                                 struct v4l2_subdev_pad_config *cfg,
 189                                 struct v4l2_subdev_frame_size_enum *fse)
 190{
 191        if (fse->pad != HISTO_PAD_SINK)
 192                return -EINVAL;
 193
 194        return vsp1_subdev_enum_frame_size(subdev, cfg, fse, HISTO_MIN_SIZE,
 195                                           HISTO_MIN_SIZE, HISTO_MAX_SIZE,
 196                                           HISTO_MAX_SIZE);
 197}
 198
 199static int histo_get_selection(struct v4l2_subdev *subdev,
 200                               struct v4l2_subdev_pad_config *cfg,
 201                               struct v4l2_subdev_selection *sel)
 202{
 203        struct vsp1_histogram *histo = subdev_to_histo(subdev);
 204        struct v4l2_subdev_pad_config *config;
 205        struct v4l2_mbus_framefmt *format;
 206        struct v4l2_rect *crop;
 207        int ret = 0;
 208
 209        if (sel->pad != HISTO_PAD_SINK)
 210                return -EINVAL;
 211
 212        mutex_lock(&histo->entity.lock);
 213
 214        config = vsp1_entity_get_pad_config(&histo->entity, cfg, sel->which);
 215        if (!config) {
 216                ret = -EINVAL;
 217                goto done;
 218        }
 219
 220        switch (sel->target) {
 221        case V4L2_SEL_TGT_COMPOSE_BOUNDS:
 222        case V4L2_SEL_TGT_COMPOSE_DEFAULT:
 223                crop = vsp1_entity_get_pad_selection(&histo->entity, config,
 224                                                     HISTO_PAD_SINK,
 225                                                     V4L2_SEL_TGT_CROP);
 226                sel->r.left = 0;
 227                sel->r.top = 0;
 228                sel->r.width = crop->width;
 229                sel->r.height = crop->height;
 230                break;
 231
 232        case V4L2_SEL_TGT_CROP_BOUNDS:
 233        case V4L2_SEL_TGT_CROP_DEFAULT:
 234                format = vsp1_entity_get_pad_format(&histo->entity, config,
 235                                                    HISTO_PAD_SINK);
 236                sel->r.left = 0;
 237                sel->r.top = 0;
 238                sel->r.width = format->width;
 239                sel->r.height = format->height;
 240                break;
 241
 242        case V4L2_SEL_TGT_COMPOSE:
 243        case V4L2_SEL_TGT_CROP:
 244                sel->r = *vsp1_entity_get_pad_selection(&histo->entity, config,
 245                                                        sel->pad, sel->target);
 246                break;
 247
 248        default:
 249                ret = -EINVAL;
 250                break;
 251        }
 252
 253done:
 254        mutex_unlock(&histo->entity.lock);
 255        return ret;
 256}
 257
 258static int histo_set_crop(struct v4l2_subdev *subdev,
 259                          struct v4l2_subdev_pad_config *config,
 260                         struct v4l2_subdev_selection *sel)
 261{
 262        struct vsp1_histogram *histo = subdev_to_histo(subdev);
 263        struct v4l2_mbus_framefmt *format;
 264        struct v4l2_rect *selection;
 265
 266        /* The crop rectangle must be inside the input frame. */
 267        format = vsp1_entity_get_pad_format(&histo->entity, config,
 268                                            HISTO_PAD_SINK);
 269        sel->r.left = clamp_t(unsigned int, sel->r.left, 0, format->width - 1);
 270        sel->r.top = clamp_t(unsigned int, sel->r.top, 0, format->height - 1);
 271        sel->r.width = clamp_t(unsigned int, sel->r.width, HISTO_MIN_SIZE,
 272                               format->width - sel->r.left);
 273        sel->r.height = clamp_t(unsigned int, sel->r.height, HISTO_MIN_SIZE,
 274                                format->height - sel->r.top);
 275
 276        /* Set the crop rectangle and reset the compose rectangle. */
 277        selection = vsp1_entity_get_pad_selection(&histo->entity, config,
 278                                                  sel->pad, V4L2_SEL_TGT_CROP);
 279        *selection = sel->r;
 280
 281        selection = vsp1_entity_get_pad_selection(&histo->entity, config,
 282                                                  sel->pad,
 283                                                  V4L2_SEL_TGT_COMPOSE);
 284        *selection = sel->r;
 285
 286        return 0;
 287}
 288
 289static int histo_set_compose(struct v4l2_subdev *subdev,
 290                             struct v4l2_subdev_pad_config *config,
 291                             struct v4l2_subdev_selection *sel)
 292{
 293        struct vsp1_histogram *histo = subdev_to_histo(subdev);
 294        struct v4l2_rect *compose;
 295        struct v4l2_rect *crop;
 296        unsigned int ratio;
 297
 298        /*
 299         * The compose rectangle is used to configure downscaling, the top left
 300         * corner is fixed to (0,0) and the size to 1/2 or 1/4 of the crop
 301         * rectangle.
 302         */
 303        sel->r.left = 0;
 304        sel->r.top = 0;
 305
 306        crop = vsp1_entity_get_pad_selection(&histo->entity, config, sel->pad,
 307                                             V4L2_SEL_TGT_CROP);
 308
 309        /*
 310         * Clamp the width and height to acceptable values first and then
 311         * compute the closest rounded dividing ratio.
 312         *
 313         * Ratio        Rounded ratio
 314         * --------------------------
 315         * [1.0 1.5[    1
 316         * [1.5 3.0[    2
 317         * [3.0 4.0]    4
 318         *
 319         * The rounded ratio can be computed using
 320         *
 321         * 1 << (ceil(ratio * 2) / 3)
 322         */
 323        sel->r.width = clamp(sel->r.width, crop->width / 4, crop->width);
 324        ratio = 1 << (crop->width * 2 / sel->r.width / 3);
 325        sel->r.width = crop->width / ratio;
 326
 327
 328        sel->r.height = clamp(sel->r.height, crop->height / 4, crop->height);
 329        ratio = 1 << (crop->height * 2 / sel->r.height / 3);
 330        sel->r.height = crop->height / ratio;
 331
 332        compose = vsp1_entity_get_pad_selection(&histo->entity, config,
 333                                                sel->pad,
 334                                                V4L2_SEL_TGT_COMPOSE);
 335        *compose = sel->r;
 336
 337        return 0;
 338}
 339
 340static int histo_set_selection(struct v4l2_subdev *subdev,
 341                               struct v4l2_subdev_pad_config *cfg,
 342                               struct v4l2_subdev_selection *sel)
 343{
 344        struct vsp1_histogram *histo = subdev_to_histo(subdev);
 345        struct v4l2_subdev_pad_config *config;
 346        int ret;
 347
 348        if (sel->pad != HISTO_PAD_SINK)
 349                return -EINVAL;
 350
 351        mutex_lock(&histo->entity.lock);
 352
 353        config = vsp1_entity_get_pad_config(&histo->entity, cfg, sel->which);
 354        if (!config) {
 355                ret = -EINVAL;
 356                goto done;
 357        }
 358
 359        if (sel->target == V4L2_SEL_TGT_CROP)
 360                ret = histo_set_crop(subdev, config, sel);
 361        else if (sel->target == V4L2_SEL_TGT_COMPOSE)
 362                ret = histo_set_compose(subdev, config, sel);
 363        else
 364                ret = -EINVAL;
 365
 366done:
 367        mutex_unlock(&histo->entity.lock);
 368        return ret;
 369}
 370
 371static int histo_get_format(struct v4l2_subdev *subdev,
 372                            struct v4l2_subdev_pad_config *cfg,
 373                            struct v4l2_subdev_format *fmt)
 374{
 375        if (fmt->pad == HISTO_PAD_SOURCE) {
 376                fmt->format.code = MEDIA_BUS_FMT_FIXED;
 377                fmt->format.width = 0;
 378                fmt->format.height = 0;
 379                fmt->format.field = V4L2_FIELD_NONE;
 380                fmt->format.colorspace = V4L2_COLORSPACE_RAW;
 381                return 0;
 382        }
 383
 384        return vsp1_subdev_get_pad_format(subdev, cfg, fmt);
 385}
 386
 387static int histo_set_format(struct v4l2_subdev *subdev,
 388                            struct v4l2_subdev_pad_config *cfg,
 389                            struct v4l2_subdev_format *fmt)
 390{
 391        struct vsp1_histogram *histo = subdev_to_histo(subdev);
 392
 393        if (fmt->pad != HISTO_PAD_SINK)
 394                return histo_get_format(subdev, cfg, fmt);
 395
 396        return vsp1_subdev_set_pad_format(subdev, cfg, fmt,
 397                                          histo->formats, histo->num_formats,
 398                                          HISTO_MIN_SIZE, HISTO_MIN_SIZE,
 399                                          HISTO_MAX_SIZE, HISTO_MAX_SIZE);
 400}
 401
 402static const struct v4l2_subdev_pad_ops histo_pad_ops = {
 403        .enum_mbus_code = histo_enum_mbus_code,
 404        .enum_frame_size = histo_enum_frame_size,
 405        .get_fmt = histo_get_format,
 406        .set_fmt = histo_set_format,
 407        .get_selection = histo_get_selection,
 408        .set_selection = histo_set_selection,
 409};
 410
 411static const struct v4l2_subdev_ops histo_ops = {
 412        .pad    = &histo_pad_ops,
 413};
 414
 415/* -----------------------------------------------------------------------------
 416 * V4L2 ioctls
 417 */
 418
 419static int histo_v4l2_querycap(struct file *file, void *fh,
 420                               struct v4l2_capability *cap)
 421{
 422        struct v4l2_fh *vfh = file->private_data;
 423        struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev);
 424
 425        cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 426                          | V4L2_CAP_VIDEO_CAPTURE_MPLANE
 427                          | V4L2_CAP_VIDEO_OUTPUT_MPLANE
 428                          | V4L2_CAP_META_CAPTURE;
 429
 430        strscpy(cap->driver, "vsp1", sizeof(cap->driver));
 431        strscpy(cap->card, histo->video.name, sizeof(cap->card));
 432        snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
 433                 dev_name(histo->entity.vsp1->dev));
 434
 435        return 0;
 436}
 437
 438static int histo_v4l2_enum_format(struct file *file, void *fh,
 439                                  struct v4l2_fmtdesc *f)
 440{
 441        struct v4l2_fh *vfh = file->private_data;
 442        struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev);
 443
 444        if (f->index > 0 || f->type != histo->queue.type)
 445                return -EINVAL;
 446
 447        f->pixelformat = histo->meta_format;
 448
 449        return 0;
 450}
 451
 452static int histo_v4l2_get_format(struct file *file, void *fh,
 453                                 struct v4l2_format *format)
 454{
 455        struct v4l2_fh *vfh = file->private_data;
 456        struct vsp1_histogram *histo = vdev_to_histo(vfh->vdev);
 457        struct v4l2_meta_format *meta = &format->fmt.meta;
 458
 459        if (format->type != histo->queue.type)
 460                return -EINVAL;
 461
 462        memset(meta, 0, sizeof(*meta));
 463
 464        meta->dataformat = histo->meta_format;
 465        meta->buffersize = histo->data_size;
 466
 467        return 0;
 468}
 469
 470static const struct v4l2_ioctl_ops histo_v4l2_ioctl_ops = {
 471        .vidioc_querycap                = histo_v4l2_querycap,
 472        .vidioc_enum_fmt_meta_cap       = histo_v4l2_enum_format,
 473        .vidioc_g_fmt_meta_cap          = histo_v4l2_get_format,
 474        .vidioc_s_fmt_meta_cap          = histo_v4l2_get_format,
 475        .vidioc_try_fmt_meta_cap        = histo_v4l2_get_format,
 476        .vidioc_reqbufs                 = vb2_ioctl_reqbufs,
 477        .vidioc_querybuf                = vb2_ioctl_querybuf,
 478        .vidioc_qbuf                    = vb2_ioctl_qbuf,
 479        .vidioc_dqbuf                   = vb2_ioctl_dqbuf,
 480        .vidioc_create_bufs             = vb2_ioctl_create_bufs,
 481        .vidioc_prepare_buf             = vb2_ioctl_prepare_buf,
 482        .vidioc_streamon                = vb2_ioctl_streamon,
 483        .vidioc_streamoff               = vb2_ioctl_streamoff,
 484};
 485
 486/* -----------------------------------------------------------------------------
 487 * V4L2 File Operations
 488 */
 489
 490static const struct v4l2_file_operations histo_v4l2_fops = {
 491        .owner = THIS_MODULE,
 492        .unlocked_ioctl = video_ioctl2,
 493        .open = v4l2_fh_open,
 494        .release = vb2_fop_release,
 495        .poll = vb2_fop_poll,
 496        .mmap = vb2_fop_mmap,
 497};
 498
 499static void vsp1_histogram_cleanup(struct vsp1_histogram *histo)
 500{
 501        if (video_is_registered(&histo->video))
 502                video_unregister_device(&histo->video);
 503
 504        media_entity_cleanup(&histo->video.entity);
 505}
 506
 507void vsp1_histogram_destroy(struct vsp1_entity *entity)
 508{
 509        struct vsp1_histogram *histo = subdev_to_histo(&entity->subdev);
 510
 511        vsp1_histogram_cleanup(histo);
 512}
 513
 514int vsp1_histogram_init(struct vsp1_device *vsp1, struct vsp1_histogram *histo,
 515                        enum vsp1_entity_type type, const char *name,
 516                        const struct vsp1_entity_operations *ops,
 517                        const unsigned int *formats, unsigned int num_formats,
 518                        size_t data_size, u32 meta_format)
 519{
 520        int ret;
 521
 522        histo->formats = formats;
 523        histo->num_formats = num_formats;
 524        histo->data_size = data_size;
 525        histo->meta_format = meta_format;
 526
 527        histo->pad.flags = MEDIA_PAD_FL_SINK;
 528        histo->video.vfl_dir = VFL_DIR_RX;
 529
 530        mutex_init(&histo->lock);
 531        spin_lock_init(&histo->irqlock);
 532        INIT_LIST_HEAD(&histo->irqqueue);
 533        init_waitqueue_head(&histo->wait_queue);
 534
 535        /* Initialize the VSP entity... */
 536        histo->entity.ops = ops;
 537        histo->entity.type = type;
 538
 539        ret = vsp1_entity_init(vsp1, &histo->entity, name, 2, &histo_ops,
 540                               MEDIA_ENT_F_PROC_VIDEO_STATISTICS);
 541        if (ret < 0)
 542                return ret;
 543
 544        /* ... and the media entity... */
 545        ret = media_entity_pads_init(&histo->video.entity, 1, &histo->pad);
 546        if (ret < 0)
 547                return ret;
 548
 549        /* ... and the video node... */
 550        histo->video.v4l2_dev = &vsp1->v4l2_dev;
 551        histo->video.fops = &histo_v4l2_fops;
 552        snprintf(histo->video.name, sizeof(histo->video.name),
 553                 "%s histo", histo->entity.subdev.name);
 554        histo->video.vfl_type = VFL_TYPE_GRABBER;
 555        histo->video.release = video_device_release_empty;
 556        histo->video.ioctl_ops = &histo_v4l2_ioctl_ops;
 557        histo->video.device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
 558
 559        video_set_drvdata(&histo->video, histo);
 560
 561        /* ... and the buffers queue... */
 562        histo->queue.type = V4L2_BUF_TYPE_META_CAPTURE;
 563        histo->queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF;
 564        histo->queue.lock = &histo->lock;
 565        histo->queue.drv_priv = histo;
 566        histo->queue.buf_struct_size = sizeof(struct vsp1_histogram_buffer);
 567        histo->queue.ops = &histo_video_queue_qops;
 568        histo->queue.mem_ops = &vb2_vmalloc_memops;
 569        histo->queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
 570        histo->queue.dev = vsp1->dev;
 571        ret = vb2_queue_init(&histo->queue);
 572        if (ret < 0) {
 573                dev_err(vsp1->dev, "failed to initialize vb2 queue\n");
 574                goto error;
 575        }
 576
 577        /* ... and register the video device. */
 578        histo->video.queue = &histo->queue;
 579        ret = video_register_device(&histo->video, VFL_TYPE_GRABBER, -1);
 580        if (ret < 0) {
 581                dev_err(vsp1->dev, "failed to register video device\n");
 582                goto error;
 583        }
 584
 585        return 0;
 586
 587error:
 588        vsp1_histogram_cleanup(histo);
 589        return ret;
 590}
 591