drivers/staging/media/omap4iss/iss_video.c

   1 /*
   2  * TI OMAP4 ISS V4L2 Driver - Generic video node
   3  *
   4  * Copyright (C) 2012 Texas Instruments, Inc.
   5  *
   6  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <asm/cacheflush.h>
  15 #include <linux/clk.h>
  16 #include <linux/mm.h>
  17 #include <linux/pagemap.h>
  18 #include <linux/sched.h>
  19 #include <linux/slab.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/module.h>
  22 #include <media/v4l2-dev.h>
  23 #include <media/v4l2-ioctl.h>
  24
  25 #include "iss_video.h"
  26 #include "iss.h"
  27
  28
  29 /* -----------------------------------------------------------------------------
  30  * Helper functions
  31  */
  32
  33 static struct iss_format_info formats[] = {
  34         { V4L2_MBUS_FMT_Y8_1X8, V4L2_MBUS_FMT_Y8_1X8,
  35           V4L2_MBUS_FMT_Y8_1X8, V4L2_MBUS_FMT_Y8_1X8,
  36           V4L2_PIX_FMT_GREY, 8, },
  37         { V4L2_MBUS_FMT_Y10_1X10, V4L2_MBUS_FMT_Y10_1X10,
  38           V4L2_MBUS_FMT_Y10_1X10, V4L2_MBUS_FMT_Y8_1X8,
  39           V4L2_PIX_FMT_Y10, 10, },
  40         { V4L2_MBUS_FMT_Y12_1X12, V4L2_MBUS_FMT_Y10_1X10,
  41           V4L2_MBUS_FMT_Y12_1X12, V4L2_MBUS_FMT_Y8_1X8,
  42           V4L2_PIX_FMT_Y12, 12, },
  43         { V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_MBUS_FMT_SBGGR8_1X8,
  44           V4L2_MBUS_FMT_SBGGR8_1X8, V4L2_MBUS_FMT_SBGGR8_1X8,
  45           V4L2_PIX_FMT_SBGGR8, 8, },
  46         { V4L2_MBUS_FMT_SGBRG8_1X8, V4L2_MBUS_FMT_SGBRG8_1X8,
  47           V4L2_MBUS_FMT_SGBRG8_1X8, V4L2_MBUS_FMT_SGBRG8_1X8,
  48           V4L2_PIX_FMT_SGBRG8, 8, },
  49         { V4L2_MBUS_FMT_SGRBG8_1X8, V4L2_MBUS_FMT_SGRBG8_1X8,
  50           V4L2_MBUS_FMT_SGRBG8_1X8, V4L2_MBUS_FMT_SGRBG8_1X8,
  51           V4L2_PIX_FMT_SGRBG8, 8, },
  52         { V4L2_MBUS_FMT_SRGGB8_1X8, V4L2_MBUS_FMT_SRGGB8_1X8,
  53           V4L2_MBUS_FMT_SRGGB8_1X8, V4L2_MBUS_FMT_SRGGB8_1X8,
  54           V4L2_PIX_FMT_SRGGB8, 8, },
  55         { V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8, V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8,
  56           V4L2_MBUS_FMT_SGRBG10_1X10, 0,
  57           V4L2_PIX_FMT_SGRBG10DPCM8, 8, },
  58         { V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_MBUS_FMT_SBGGR10_1X10,
  59           V4L2_MBUS_FMT_SBGGR10_1X10, V4L2_MBUS_FMT_SBGGR8_1X8,
  60           V4L2_PIX_FMT_SBGGR10, 10, },
  61         { V4L2_MBUS_FMT_SGBRG10_1X10, V4L2_MBUS_FMT_SGBRG10_1X10,
  62           V4L2_MBUS_FMT_SGBRG10_1X10, V4L2_MBUS_FMT_SGBRG8_1X8,
  63           V4L2_PIX_FMT_SGBRG10, 10, },
  64         { V4L2_MBUS_FMT_SGRBG10_1X10, V4L2_MBUS_FMT_SGRBG10_1X10,
  65           V4L2_MBUS_FMT_SGRBG10_1X10, V4L2_MBUS_FMT_SGRBG8_1X8,
  66           V4L2_PIX_FMT_SGRBG10, 10, },
  67         { V4L2_MBUS_FMT_SRGGB10_1X10, V4L2_MBUS_FMT_SRGGB10_1X10,
  68           V4L2_MBUS_FMT_SRGGB10_1X10, V4L2_MBUS_FMT_SRGGB8_1X8,
  69           V4L2_PIX_FMT_SRGGB10, 10, },
  70         { V4L2_MBUS_FMT_SBGGR12_1X12, V4L2_MBUS_FMT_SBGGR10_1X10,
  71           V4L2_MBUS_FMT_SBGGR12_1X12, V4L2_MBUS_FMT_SBGGR8_1X8,
  72           V4L2_PIX_FMT_SBGGR12, 12, },
  73         { V4L2_MBUS_FMT_SGBRG12_1X12, V4L2_MBUS_FMT_SGBRG10_1X10,
  74           V4L2_MBUS_FMT_SGBRG12_1X12, V4L2_MBUS_FMT_SGBRG8_1X8,
  75           V4L2_PIX_FMT_SGBRG12, 12, },
  76         { V4L2_MBUS_FMT_SGRBG12_1X12, V4L2_MBUS_FMT_SGRBG10_1X10,
  77           V4L2_MBUS_FMT_SGRBG12_1X12, V4L2_MBUS_FMT_SGRBG8_1X8,
  78           V4L2_PIX_FMT_SGRBG12, 12, },
  79         { V4L2_MBUS_FMT_SRGGB12_1X12, V4L2_MBUS_FMT_SRGGB10_1X10,
  80           V4L2_MBUS_FMT_SRGGB12_1X12, V4L2_MBUS_FMT_SRGGB8_1X8,
  81           V4L2_PIX_FMT_SRGGB12, 12, },
  82         { V4L2_MBUS_FMT_UYVY8_1X16, V4L2_MBUS_FMT_UYVY8_1X16,
  83           V4L2_MBUS_FMT_UYVY8_1X16, 0,
  84           V4L2_PIX_FMT_UYVY, 16, },
  85         { V4L2_MBUS_FMT_YUYV8_1X16, V4L2_MBUS_FMT_YUYV8_1X16,
  86           V4L2_MBUS_FMT_YUYV8_1X16, 0,
  87           V4L2_PIX_FMT_YUYV, 16, },
  88         { V4L2_MBUS_FMT_YUYV8_1_5X8, V4L2_MBUS_FMT_YUYV8_1_5X8,
  89           V4L2_MBUS_FMT_YUYV8_1_5X8, 0,
  90           V4L2_PIX_FMT_NV12, 8, },
  91 };
  92
  93 const struct iss_format_info *
  94 omap4iss_video_format_info(enum v4l2_mbus_pixelcode code)
  95 {
  96         unsigned int i;
  97
  98         for (i = 0; i < ARRAY_SIZE(formats); ++i) {
  99                 if (formats[i].code == code)
 100                         return &formats[i];
 101         }
 102
 103         return NULL;
 104 }
 105
 106 /*
 107  * iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
 108  * @video: ISS video instance
 109  * @mbus: v4l2_mbus_framefmt format (input)
 110  * @pix: v4l2_pix_format format (output)
 111  *
 112  * Fill the output pix structure with information from the input mbus format.
 113  * The bytesperline and sizeimage fields are computed from the requested bytes
 114  * per line value in the pix format and information from the video instance.
 115  *
 116  * Return the number of padding bytes at end of line.
 117  */
 118 static unsigned int iss_video_mbus_to_pix(const struct iss_video *video,
 119                                           const struct v4l2_mbus_framefmt *mbus,
 120                                           struct v4l2_pix_format *pix)
 121 {
 122         unsigned int bpl = pix->bytesperline;
 123         unsigned int min_bpl;
 124         unsigned int i;
 125
 126         memset(pix, 0, sizeof(*pix));
 127         pix->width = mbus->width;
 128         pix->height = mbus->height;
 129
 130         /* Skip the last format in the loop so that it will be selected if no
 131          * match is found.
 132          */
 133         for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
 134                 if (formats[i].code == mbus->code)
 135                         break;
 136         }
 137
 138         min_bpl = pix->width * ALIGN(formats[i].bpp, 8) / 8;
 139
 140         /* Clamp the requested bytes per line value. If the maximum bytes per
 141          * line value is zero, the module doesn't support user configurable line
 142          * sizes. Override the requested value with the minimum in that case.
 143          */
 144         if (video->bpl_max)
 145                 bpl = clamp(bpl, min_bpl, video->bpl_max);
 146         else
 147                 bpl = min_bpl;
 148
 149         if (!video->bpl_zero_padding || bpl != min_bpl)
 150                 bpl = ALIGN(bpl, video->bpl_alignment);
 151
 152         pix->pixelformat = formats[i].pixelformat;
 153         pix->bytesperline = bpl;
 154         pix->sizeimage = pix->bytesperline * pix->height;
 155         pix->colorspace = mbus->colorspace;
 156         pix->field = mbus->field;
 157
 158         /* FIXME: Special case for NV12! We should make this nicer... */
 159         if (pix->pixelformat == V4L2_PIX_FMT_NV12)
 160                 pix->sizeimage += (pix->bytesperline * pix->height) / 2;
 161
 162         return bpl - min_bpl;
 163 }
 164
 165 static void iss_video_pix_to_mbus(const struct v4l2_pix_format *pix,
 166                                   struct v4l2_mbus_framefmt *mbus)
 167 {
 168         unsigned int i;
 169
 170         memset(mbus, 0, sizeof(*mbus));
 171         mbus->width = pix->width;
 172         mbus->height = pix->height;
 173
 174         for (i = 0; i < ARRAY_SIZE(formats); ++i) {
 175                 if (formats[i].pixelformat == pix->pixelformat)
 176                         break;
 177         }
 178
 179         if (WARN_ON(i == ARRAY_SIZE(formats)))
 180                 return;
 181
 182         mbus->code = formats[i].code;
 183         mbus->colorspace = pix->colorspace;
 184         mbus->field = pix->field;
 185 }
 186
 187 static struct v4l2_subdev *
 188 iss_video_remote_subdev(struct iss_video *video, u32 *pad)
 189 {
 190         struct media_pad *remote;
 191
 192         remote = media_entity_remote_pad(&video->pad);
 193
 194         if (remote == NULL ||
 195             media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
 196                 return NULL;
 197
 198         if (pad)
 199                 *pad = remote->index;
 200
 201         return media_entity_to_v4l2_subdev(remote->entity);
 202 }
 203
 204 /* Return a pointer to the ISS video instance at the far end of the pipeline. */
 205 static struct iss_video *
 206 iss_video_far_end(struct iss_video *video)
 207 {
 208         struct media_entity_graph graph;
 209         struct media_entity *entity = &video->video.entity;
 210         struct media_device *mdev = entity->parent;
 211         struct iss_video *far_end = NULL;
 212
 213         mutex_lock(&mdev->graph_mutex);
 214         media_entity_graph_walk_start(&graph, entity);
 215
 216         while ((entity = media_entity_graph_walk_next(&graph))) {
 217                 if (entity == &video->video.entity)
 218                         continue;
 219
 220                 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
 221                         continue;
 222
 223                 far_end = to_iss_video(media_entity_to_video_device(entity));
 224                 if (far_end->type != video->type)
 225                         break;
 226
 227                 far_end = NULL;
 228         }
 229
 230         mutex_unlock(&mdev->graph_mutex);
 231         return far_end;
 232 }
 233
 234 static int
 235 __iss_video_get_format(struct iss_video *video, struct v4l2_format *format)
 236 {
 237         struct v4l2_subdev_format fmt;
 238         struct v4l2_subdev *subdev;
 239         u32 pad;
 240         int ret;
 241
 242         subdev = iss_video_remote_subdev(video, &pad);
 243         if (subdev == NULL)
 244                 return -EINVAL;
 245
 246         mutex_lock(&video->mutex);
 247
 248         fmt.pad = pad;
 249         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 250         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 251         if (ret == -ENOIOCTLCMD)
 252                 ret = -EINVAL;
 253
 254         mutex_unlock(&video->mutex);
 255
 256         if (ret)
 257                 return ret;
 258
 259         format->type = video->type;
 260         return iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
 261 }
 262
 263 static int
 264 iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
 265 {
 266         struct v4l2_format format;
 267         int ret;
 268
 269         memcpy(&format, &vfh->format, sizeof(format));
 270         ret = __iss_video_get_format(video, &format);
 271         if (ret < 0)
 272                 return ret;
 273
 274         if (vfh->format.fmt.pix.pixelformat != format.fmt.pix.pixelformat ||
 275             vfh->format.fmt.pix.height != format.fmt.pix.height ||
 276             vfh->format.fmt.pix.width != format.fmt.pix.width ||
 277             vfh->format.fmt.pix.bytesperline != format.fmt.pix.bytesperline ||
 278             vfh->format.fmt.pix.sizeimage != format.fmt.pix.sizeimage)
 279                 return -EINVAL;
 280
 281         return ret;
 282 }
 283
 284 /* -----------------------------------------------------------------------------
 285  * Video queue operations
 286  */
 287
 288 static int iss_video_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
 289                                  unsigned int *count, unsigned int *num_planes,
 290                                  unsigned int sizes[], void *alloc_ctxs[])
 291 {
 292         struct iss_video_fh *vfh = vb2_get_drv_priv(vq);
 293         struct iss_video *video = vfh->video;
 294
 295         /* Revisit multi-planar support for NV12 */
 296         *num_planes = 1;
 297
 298         sizes[0] = vfh->format.fmt.pix.sizeimage;
 299         if (sizes[0] == 0)
 300                 return -EINVAL;
 301
 302         alloc_ctxs[0] = video->alloc_ctx;
 303
 304         *count = min(*count, (unsigned int)(video->capture_mem / PAGE_ALIGN(sizes[0])));
 305
 306         return 0;
 307 }
 308
 309 static void iss_video_buf_cleanup(struct vb2_buffer *vb)
 310 {
 311         struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
 312
 313         if (buffer->iss_addr)
 314                 buffer->iss_addr = 0;
 315 }
 316
 317 static int iss_video_buf_prepare(struct vb2_buffer *vb)
 318 {
 319         struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
 320         struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
 321         struct iss_video *video = vfh->video;
 322         unsigned long size = vfh->format.fmt.pix.sizeimage;
 323         dma_addr_t addr;
 324
 325         if (vb2_plane_size(vb, 0) < size)
 326                 return -ENOBUFS;
 327
 328         addr = vb2_dma_contig_plane_dma_addr(vb, 0);
 329         if (!IS_ALIGNED(addr, 32)) {
 330                 dev_dbg(video->iss->dev, "Buffer address must be "
 331                         "aligned to 32 bytes boundary.\n");
 332                 return -EINVAL;
 333         }
 334
 335         vb2_set_plane_payload(vb, 0, size);
 336         buffer->iss_addr = addr;
 337         return 0;
 338 }
 339
 340 static void iss_video_buf_queue(struct vb2_buffer *vb)
 341 {
 342         struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
 343         struct iss_video *video = vfh->video;
 344         struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
 345         struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
 346         unsigned int empty;
 347         unsigned long flags;
 348
 349         spin_lock_irqsave(&video->qlock, flags);
 350         empty = list_empty(&video->dmaqueue);
 351         list_add_tail(&buffer->list, &video->dmaqueue);
 352         spin_unlock_irqrestore(&video->qlock, flags);
 353
 354         if (empty) {
 355                 enum iss_pipeline_state state;
 356                 unsigned int start;
 357
 358                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 359                         state = ISS_PIPELINE_QUEUE_OUTPUT;
 360                 else
 361                         state = ISS_PIPELINE_QUEUE_INPUT;
 362
 363                 spin_lock_irqsave(&pipe->lock, flags);
 364                 pipe->state |= state;
 365                 video->ops->queue(video, buffer);
 366                 video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
 367
 368                 start = iss_pipeline_ready(pipe);
 369                 if (start)
 370                         pipe->state |= ISS_PIPELINE_STREAM;
 371                 spin_unlock_irqrestore(&pipe->lock, flags);
 372
 373                 if (start)
 374                         omap4iss_pipeline_set_stream(pipe,
 375                                                 ISS_PIPELINE_STREAM_SINGLESHOT);
 376         }
 377 }
 378
 379 static struct vb2_ops iss_video_vb2ops = {
 380         .queue_setup    = iss_video_queue_setup,
 381         .buf_prepare    = iss_video_buf_prepare,
 382         .buf_queue      = iss_video_buf_queue,
 383         .buf_cleanup    = iss_video_buf_cleanup,
 384 };
 385
 386 /*
 387  * omap4iss_video_buffer_next - Complete the current buffer and return the next
 388  * @video: ISS video object
 389  *
 390  * Remove the current video buffer from the DMA queue and fill its timestamp,
 391  * field count and state fields before waking up its completion handler.
 392  *
 393  * For capture video nodes, the buffer state is set to VB2_BUF_STATE_DONE if no
 394  * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
 395  *
 396  * The DMA queue is expected to contain at least one buffer.
 397  *
 398  * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
 399  * empty.
 400  */
 401 struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
 402 {
 403         struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
 404         enum iss_pipeline_state state;
 405         struct iss_buffer *buf;
 406         unsigned long flags;
 407         struct timespec ts;
 408
 409         spin_lock_irqsave(&video->qlock, flags);
 410         if (WARN_ON(list_empty(&video->dmaqueue))) {
 411                 spin_unlock_irqrestore(&video->qlock, flags);
 412                 return NULL;
 413         }
 414
 415         buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
 416                                list);
 417         list_del(&buf->list);
 418         spin_unlock_irqrestore(&video->qlock, flags);
 419
 420         ktime_get_ts(&ts);
 421         buf->vb.v4l2_buf.timestamp.tv_sec = ts.tv_sec;
 422         buf->vb.v4l2_buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
 423
 424         /* Do frame number propagation only if this is the output video node.
 425          * Frame number either comes from the CSI receivers or it gets
 426          * incremented here if H3A is not active.
 427          * Note: There is no guarantee that the output buffer will finish
 428          * first, so the input number might lag behind by 1 in some cases.
 429          */
 430         if (video == pipe->output && !pipe->do_propagation)
 431                 buf->vb.v4l2_buf.sequence = atomic_inc_return(&pipe->frame_number);
 432         else
 433                 buf->vb.v4l2_buf.sequence = atomic_read(&pipe->frame_number);
 434
 435         vb2_buffer_done(&buf->vb, pipe->error ? VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 436         pipe->error = false;
 437
 438         spin_lock_irqsave(&video->qlock, flags);
 439         if (list_empty(&video->dmaqueue)) {
 440                 spin_unlock_irqrestore(&video->qlock, flags);
 441                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 442                         state = ISS_PIPELINE_QUEUE_OUTPUT
 443                               | ISS_PIPELINE_STREAM;
 444                 else
 445                         state = ISS_PIPELINE_QUEUE_INPUT
 446                               | ISS_PIPELINE_STREAM;
 447
 448                 spin_lock_irqsave(&pipe->lock, flags);
 449                 pipe->state &= ~state;
 450                 if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
 451                         video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
 452                 spin_unlock_irqrestore(&pipe->lock, flags);
 453                 return NULL;
 454         }
 455
 456         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
 457                 spin_lock_irqsave(&pipe->lock, flags);
 458                 pipe->state &= ~ISS_PIPELINE_STREAM;
 459                 spin_unlock_irqrestore(&pipe->lock, flags);
 460         }
 461
 462         buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
 463                                list);
 464         spin_unlock_irqrestore(&video->qlock, flags);
 465         buf->vb.state = VB2_BUF_STATE_ACTIVE;
 466         return buf;
 467 }
 468
 469 /* -----------------------------------------------------------------------------
 470  * V4L2 ioctls
 471  */
 472
 473 static int
 474 iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 475 {
 476         struct iss_video *video = video_drvdata(file);
 477
 478         strlcpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
 479         strlcpy(cap->card, video->video.name, sizeof(cap->card));
 480         strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));
 481
 482         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 483                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 484         else
 485                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
 486
 487         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 488                           | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT;
 489
 490         return 0;
 491 }
 492
 493 static int
 494 iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
 495 {
 496         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 497         struct iss_video *video = video_drvdata(file);
 498
 499         if (format->type != video->type)
 500                 return -EINVAL;
 501
 502         mutex_lock(&video->mutex);
 503         *format = vfh->format;
 504         mutex_unlock(&video->mutex);
 505
 506         return 0;
 507 }
 508
 509 static int
 510 iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
 511 {
 512         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 513         struct iss_video *video = video_drvdata(file);
 514         struct v4l2_mbus_framefmt fmt;
 515
 516         if (format->type != video->type)
 517                 return -EINVAL;
 518
 519         mutex_lock(&video->mutex);
 520
 521         /* Fill the bytesperline and sizeimage fields by converting to media bus
 522          * format and back to pixel format.
 523          */
 524         iss_video_pix_to_mbus(&format->fmt.pix, &fmt);
 525         iss_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
 526
 527         vfh->format = *format;
 528
 529         mutex_unlock(&video->mutex);
 530         return 0;
 531 }
 532
 533 static int
 534 iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
 535 {
 536         struct iss_video *video = video_drvdata(file);
 537         struct v4l2_subdev_format fmt;
 538         struct v4l2_subdev *subdev;
 539         u32 pad;
 540         int ret;
 541
 542         if (format->type != video->type)
 543                 return -EINVAL;
 544
 545         subdev = iss_video_remote_subdev(video, &pad);
 546         if (subdev == NULL)
 547                 return -EINVAL;
 548
 549         iss_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
 550
 551         fmt.pad = pad;
 552         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 553         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 554         if (ret)
 555                 return ret == -ENOIOCTLCMD ? -EINVAL : ret;
 556
 557         iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
 558         return 0;
 559 }
 560
 561 static int
 562 iss_video_cropcap(struct file *file, void *fh, struct v4l2_cropcap *cropcap)
 563 {
 564         struct iss_video *video = video_drvdata(file);
 565         struct v4l2_subdev *subdev;
 566         int ret;
 567
 568         subdev = iss_video_remote_subdev(video, NULL);
 569         if (subdev == NULL)
 570                 return -EINVAL;
 571
 572         mutex_lock(&video->mutex);
 573         ret = v4l2_subdev_call(subdev, video, cropcap, cropcap);
 574         mutex_unlock(&video->mutex);
 575
 576         return ret == -ENOIOCTLCMD ? -EINVAL : ret;
 577 }
 578
 579 static int
 580 iss_video_get_crop(struct file *file, void *fh, struct v4l2_crop *crop)
 581 {
 582         struct iss_video *video = video_drvdata(file);
 583         struct v4l2_subdev_format format;
 584         struct v4l2_subdev *subdev;
 585         u32 pad;
 586         int ret;
 587
 588         subdev = iss_video_remote_subdev(video, &pad);
 589         if (subdev == NULL)
 590                 return -EINVAL;
 591
 592         /* Try the get crop operation first and fallback to get format if not
 593          * implemented.
 594          */
 595         ret = v4l2_subdev_call(subdev, video, g_crop, crop);
 596         if (ret != -ENOIOCTLCMD)
 597                 return ret;
 598
 599         format.pad = pad;
 600         format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 601         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
 602         if (ret < 0)
 603                 return ret == -ENOIOCTLCMD ? -EINVAL : ret;
 604
 605         crop->c.left = 0;
 606         crop->c.top = 0;
 607         crop->c.width = format.format.width;
 608         crop->c.height = format.format.height;
 609
 610         return 0;
 611 }
 612
 613 static int
 614 iss_video_set_crop(struct file *file, void *fh, const struct v4l2_crop *crop)
 615 {
 616         struct iss_video *video = video_drvdata(file);
 617         struct v4l2_subdev *subdev;
 618         int ret;
 619
 620         subdev = iss_video_remote_subdev(video, NULL);
 621         if (subdev == NULL)
 622                 return -EINVAL;
 623
 624         mutex_lock(&video->mutex);
 625         ret = v4l2_subdev_call(subdev, video, s_crop, crop);
 626         mutex_unlock(&video->mutex);
 627
 628         return ret == -ENOIOCTLCMD ? -EINVAL : ret;
 629 }
 630
 631 static int
 632 iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 633 {
 634         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 635         struct iss_video *video = video_drvdata(file);
 636
 637         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 638             video->type != a->type)
 639                 return -EINVAL;
 640
 641         memset(a, 0, sizeof(*a));
 642         a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 643         a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 644         a->parm.output.timeperframe = vfh->timeperframe;
 645
 646         return 0;
 647 }
 648
 649 static int
 650 iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 651 {
 652         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 653         struct iss_video *video = video_drvdata(file);
 654
 655         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 656             video->type != a->type)
 657                 return -EINVAL;
 658
 659         if (a->parm.output.timeperframe.denominator == 0)
 660                 a->parm.output.timeperframe.denominator = 1;
 661
 662         vfh->timeperframe = a->parm.output.timeperframe;
 663
 664         return 0;
 665 }
 666
 667 static int
 668 iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
 669 {
 670         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 671
 672         return vb2_reqbufs(&vfh->queue, rb);
 673 }
 674
 675 static int
 676 iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
 677 {
 678         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 679
 680         return vb2_querybuf(&vfh->queue, b);
 681 }
 682
 683 static int
 684 iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 685 {
 686         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 687
 688         return vb2_qbuf(&vfh->queue, b);
 689 }
 690
 691 static int
 692 iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 693 {
 694         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 695
 696         return vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
 697 }
 698
 699 /*
 700  * Stream management
 701  *
 702  * Every ISS pipeline has a single input and a single output. The input can be
 703  * either a sensor or a video node. The output is always a video node.
 704  *
 705  * As every pipeline has an output video node, the ISS video objects at the
 706  * pipeline output stores the pipeline state. It tracks the streaming state of
 707  * both the input and output, as well as the availability of buffers.
 708  *
 709  * In sensor-to-memory mode, frames are always available at the pipeline input.
 710  * Starting the sensor usually requires I2C transfers and must be done in
 711  * interruptible context. The pipeline is started and stopped synchronously
 712  * to the stream on/off commands. All modules in the pipeline will get their
 713  * subdev set stream handler called. The module at the end of the pipeline must
 714  * delay starting the hardware until buffers are available at its output.
 715  *
 716  * In memory-to-memory mode, starting/stopping the stream requires
 717  * synchronization between the input and output. ISS modules can't be stopped
 718  * in the middle of a frame, and at least some of the modules seem to become
 719  * busy as soon as they're started, even if they don't receive a frame start
 720  * event. For that reason frames need to be processed in single-shot mode. The
 721  * driver needs to wait until a frame is completely processed and written to
 722  * memory before restarting the pipeline for the next frame. Pipelined
 723  * processing might be possible but requires more testing.
 724  *
 725  * Stream start must be delayed until buffers are available at both the input
 726  * and output. The pipeline must be started in the videobuf queue callback with
 727  * the buffers queue spinlock held. The modules subdev set stream operation must
 728  * not sleep.
 729  */
 730 static int
 731 iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 732 {
 733         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 734         struct iss_video *video = video_drvdata(file);
 735         enum iss_pipeline_state state;
 736         struct iss_pipeline *pipe;
 737         struct iss_video *far_end;
 738         unsigned long flags;
 739         int ret;
 740
 741         if (type != video->type)
 742                 return -EINVAL;
 743
 744         mutex_lock(&video->stream_lock);
 745
 746         /* Start streaming on the pipeline. No link touching an entity in the
 747          * pipeline can be activated or deactivated once streaming is started.
 748          */
 749         pipe = video->video.entity.pipe
 750              ? to_iss_pipeline(&video->video.entity) : &video->pipe;
 751         pipe->external = NULL;
 752         pipe->external_rate = 0;
 753         pipe->external_bpp = 0;
 754
 755         if (video->iss->pdata->set_constraints)
 756                 video->iss->pdata->set_constraints(video->iss, true);
 757
 758         ret = media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
 759         if (ret < 0)
 760                 goto err_media_entity_pipeline_start;
 761
 762         /* Verify that the currently configured format matches the output of
 763          * the connected subdev.
 764          */
 765         ret = iss_video_check_format(video, vfh);
 766         if (ret < 0)
 767                 goto err_iss_video_check_format;
 768
 769         video->bpl_padding = ret;
 770         video->bpl_value = vfh->format.fmt.pix.bytesperline;
 771
 772         /* Find the ISS video node connected at the far end of the pipeline and
 773          * update the pipeline.
 774          */
 775         far_end = iss_video_far_end(video);
 776
 777         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 778                 state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
 779                 pipe->input = far_end;
 780                 pipe->output = video;
 781         } else {
 782                 if (far_end == NULL) {
 783                         ret = -EPIPE;
 784                         goto err_iss_video_check_format;
 785                 }
 786
 787                 state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
 788                 pipe->input = video;
 789                 pipe->output = far_end;
 790         }
 791
 792         spin_lock_irqsave(&pipe->lock, flags);
 793         pipe->state &= ~ISS_PIPELINE_STREAM;
 794         pipe->state |= state;
 795         spin_unlock_irqrestore(&pipe->lock, flags);
 796
 797         /* Set the maximum time per frame as the value requested by userspace.
 798          * This is a soft limit that can be overridden if the hardware doesn't
 799          * support the request limit.
 800          */
 801         if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 802                 pipe->max_timeperframe = vfh->timeperframe;
 803
 804         video->queue = &vfh->queue;
 805         INIT_LIST_HEAD(&video->dmaqueue);
 806         spin_lock_init(&video->qlock);
 807         atomic_set(&pipe->frame_number, -1);
 808
 809         ret = vb2_streamon(&vfh->queue, type);
 810         if (ret < 0)
 811                 goto err_iss_video_check_format;
 812
 813         /* In sensor-to-memory mode, the stream can be started synchronously
 814          * to the stream on command. In memory-to-memory mode, it will be
 815          * started when buffers are queued on both the input and output.
 816          */
 817         if (pipe->input == NULL) {
 818                 unsigned long flags;
 819                 ret = omap4iss_pipeline_set_stream(pipe,
 820                                               ISS_PIPELINE_STREAM_CONTINUOUS);
 821                 if (ret < 0)
 822                         goto err_omap4iss_set_stream;
 823                 spin_lock_irqsave(&video->qlock, flags);
 824                 if (list_empty(&video->dmaqueue))
 825                         video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
 826                 spin_unlock_irqrestore(&video->qlock, flags);
 827         }
 828
 829         if (ret < 0) {
 830 err_omap4iss_set_stream:
 831                 vb2_streamoff(&vfh->queue, type);
 832 err_iss_video_check_format:
 833                 media_entity_pipeline_stop(&video->video.entity);
 834 err_media_entity_pipeline_start:
 835                 if (video->iss->pdata->set_constraints)
 836                         video->iss->pdata->set_constraints(video->iss, false);
 837                 video->queue = NULL;
 838         }
 839
 840         mutex_unlock(&video->stream_lock);
 841         return ret;
 842 }
 843
 844 static int
 845 iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 846 {
 847         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 848         struct iss_video *video = video_drvdata(file);
 849         struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
 850         enum iss_pipeline_state state;
 851         unsigned long flags;
 852
 853         if (type != video->type)
 854                 return -EINVAL;
 855
 856         mutex_lock(&video->stream_lock);
 857
 858         if (!vb2_is_streaming(&vfh->queue))
 859                 goto done;
 860
 861         /* Update the pipeline state. */
 862         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 863                 state = ISS_PIPELINE_STREAM_OUTPUT
 864                       | ISS_PIPELINE_QUEUE_OUTPUT;
 865         else
 866                 state = ISS_PIPELINE_STREAM_INPUT
 867                       | ISS_PIPELINE_QUEUE_INPUT;
 868
 869         spin_lock_irqsave(&pipe->lock, flags);
 870         pipe->state &= ~state;
 871         spin_unlock_irqrestore(&pipe->lock, flags);
 872
 873         /* Stop the stream. */
 874         omap4iss_pipeline_set_stream(pipe, ISS_PIPELINE_STREAM_STOPPED);
 875         vb2_streamoff(&vfh->queue, type);
 876         video->queue = NULL;
 877
 878         if (video->iss->pdata->set_constraints)
 879                 video->iss->pdata->set_constraints(video->iss, false);
 880         media_entity_pipeline_stop(&video->video.entity);
 881
 882 done:
 883         mutex_unlock(&video->stream_lock);
 884         return 0;
 885 }
 886
 887 static int
 888 iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
 889 {
 890         if (input->index > 0)
 891                 return -EINVAL;
 892
 893         strlcpy(input->name, "camera", sizeof(input->name));
 894         input->type = V4L2_INPUT_TYPE_CAMERA;
 895
 896         return 0;
 897 }
 898
 899 static int
 900 iss_video_g_input(struct file *file, void *fh, unsigned int *input)
 901 {
 902         *input = 0;
 903
 904         return 0;
 905 }
 906
 907 static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
 908         .vidioc_querycap                = iss_video_querycap,
 909         .vidioc_g_fmt_vid_cap           = iss_video_get_format,
 910         .vidioc_s_fmt_vid_cap           = iss_video_set_format,
 911         .vidioc_try_fmt_vid_cap         = iss_video_try_format,
 912         .vidioc_g_fmt_vid_out           = iss_video_get_format,
 913         .vidioc_s_fmt_vid_out           = iss_video_set_format,
 914         .vidioc_try_fmt_vid_out         = iss_video_try_format,
 915         .vidioc_cropcap                 = iss_video_cropcap,
 916         .vidioc_g_crop                  = iss_video_get_crop,
 917         .vidioc_s_crop                  = iss_video_set_crop,
 918         .vidioc_g_parm                  = iss_video_get_param,
 919         .vidioc_s_parm                  = iss_video_set_param,
 920         .vidioc_reqbufs                 = iss_video_reqbufs,
 921         .vidioc_querybuf                = iss_video_querybuf,
 922         .vidioc_qbuf                    = iss_video_qbuf,
 923         .vidioc_dqbuf                   = iss_video_dqbuf,
 924         .vidioc_streamon                = iss_video_streamon,
 925         .vidioc_streamoff               = iss_video_streamoff,
 926         .vidioc_enum_input              = iss_video_enum_input,
 927         .vidioc_g_input                 = iss_video_g_input,
 928 };
 929
 930 /* -----------------------------------------------------------------------------
 931  * V4L2 file operations
 932  */
 933
 934 static int iss_video_open(struct file *file)
 935 {
 936         struct iss_video *video = video_drvdata(file);
 937         struct iss_video_fh *handle;
 938         struct vb2_queue *q;
 939         int ret = 0;
 940
 941         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
 942         if (handle == NULL)
 943                 return -ENOMEM;
 944
 945         v4l2_fh_init(&handle->vfh, &video->video);
 946         v4l2_fh_add(&handle->vfh);
 947
 948         /* If this is the first user, initialise the pipeline. */
 949         if (omap4iss_get(video->iss) == NULL) {
 950                 ret = -EBUSY;
 951                 goto done;
 952         }
 953
 954         ret = omap4iss_pipeline_pm_use(&video->video.entity, 1);
 955         if (ret < 0) {
 956                 omap4iss_put(video->iss);
 957                 goto done;
 958         }
 959
 960         video->alloc_ctx = vb2_dma_contig_init_ctx(video->iss->dev);
 961         if (IS_ERR(video->alloc_ctx)) {
 962                 ret = PTR_ERR(video->alloc_ctx);
 963                 omap4iss_put(video->iss);
 964                 goto done;
 965         }
 966
 967         q = &handle->queue;
 968
 969         q->type = video->type;
 970         q->io_modes = VB2_MMAP;
 971         q->drv_priv = handle;
 972         q->ops = &iss_video_vb2ops;
 973         q->mem_ops = &vb2_dma_contig_memops;
 974         q->buf_struct_size = sizeof(struct iss_buffer);
 975
 976         ret = vb2_queue_init(q);
 977         if (ret) {
 978                 omap4iss_put(video->iss);
 979                 goto done;
 980         }
 981
 982         memset(&handle->format, 0, sizeof(handle->format));
 983         handle->format.type = video->type;
 984         handle->timeperframe.denominator = 1;
 985
 986         handle->video = video;
 987         file->private_data = &handle->vfh;
 988
 989 done:
 990         if (ret < 0) {
 991                 v4l2_fh_del(&handle->vfh);
 992                 kfree(handle);
 993         }
 994
 995         return ret;
 996 }
 997
 998 static int iss_video_release(struct file *file)
 999 {
1000         struct iss_video *video = video_drvdata(file);
1001         struct v4l2_fh *vfh = file->private_data;
1002         struct iss_video_fh *handle = to_iss_video_fh(vfh);
1003
1004         /* Disable streaming and free the buffers queue resources. */
1005         iss_video_streamoff(file, vfh, video->type);
1006
1007         omap4iss_pipeline_pm_use(&video->video.entity, 0);
1008
1009         /* Release the videobuf2 queue */
1010         vb2_queue_release(&handle->queue);
1011
1012         /* Release the file handle. */
1013         v4l2_fh_del(vfh);
1014         kfree(handle);
1015         file->private_data = NULL;
1016
1017         omap4iss_put(video->iss);
1018
1019         return 0;
1020 }
1021
1022 static unsigned int iss_video_poll(struct file *file, poll_table *wait)
1023 {
1024         struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1025
1026         return vb2_poll(&vfh->queue, file, wait);
1027 }
1028
1029 static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
1030 {
1031         struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1032
1033         return vb2_mmap(&vfh->queue, vma);;
1034 }
1035
1036 static struct v4l2_file_operations iss_video_fops = {
1037         .owner = THIS_MODULE,
1038         .unlocked_ioctl = video_ioctl2,
1039         .open = iss_video_open,
1040         .release = iss_video_release,
1041         .poll = iss_video_poll,
1042         .mmap = iss_video_mmap,
1043 };
1044
1045 /* -----------------------------------------------------------------------------
1046  * ISS video core
1047  */
1048
1049 static const struct iss_video_operations iss_video_dummy_ops = {
1050 };
1051
1052 int omap4iss_video_init(struct iss_video *video, const char *name)
1053 {
1054         const char *direction;
1055         int ret;
1056
1057         switch (video->type) {
1058         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1059                 direction = "output";
1060                 video->pad.flags = MEDIA_PAD_FL_SINK;
1061                 break;
1062         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1063                 direction = "input";
1064                 video->pad.flags = MEDIA_PAD_FL_SOURCE;
1065                 break;
1066
1067         default:
1068                 return -EINVAL;
1069         }
1070
1071         ret = media_entity_init(&video->video.entity, 1, &video->pad, 0);
1072         if (ret < 0)
1073                 return ret;
1074
1075         mutex_init(&video->mutex);
1076         atomic_set(&video->active, 0);
1077
1078         spin_lock_init(&video->pipe.lock);
1079         mutex_init(&video->stream_lock);
1080
1081         /* Initialize the video device. */
1082         if (video->ops == NULL)
1083                 video->ops = &iss_video_dummy_ops;
1084
1085         video->video.fops = &iss_video_fops;
1086         snprintf(video->video.name, sizeof(video->video.name),
1087                  "OMAP4 ISS %s %s", name, direction);
1088         video->video.vfl_type = VFL_TYPE_GRABBER;
1089         video->video.release = video_device_release_empty;
1090         video->video.ioctl_ops = &iss_video_ioctl_ops;
1091         video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
1092
1093         video_set_drvdata(&video->video, video);
1094
1095         return 0;
1096 }
1097
1098 void omap4iss_video_cleanup(struct iss_video *video)
1099 {
1100         media_entity_cleanup(&video->video.entity);
1101         mutex_destroy(&video->stream_lock);
1102         mutex_destroy(&video->mutex);
1103 }
1104
1105 int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
1106 {
1107         int ret;
1108
1109         video->video.v4l2_dev = vdev;
1110
1111         ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1112         if (ret < 0)
1113                 printk(KERN_ERR "%s: could not register video device (%d)\n",
1114                         __func__, ret);
1115
1116         return ret;
1117 }
1118
1119 void omap4iss_video_unregister(struct iss_video *video)
1120 {
1121         if (video_is_registered(&video->video))
1122                 video_unregister_device(&video->video);
1123 }