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  * Helper functions
  30  */
  31
  32 static struct iss_format_info formats[] = {
  33         { MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
  34           MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
  35           V4L2_PIX_FMT_GREY, 8, "Greyscale 8 bpp", },
  36         { MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
  37           MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
  38           V4L2_PIX_FMT_Y10, 10, "Greyscale 10 bpp", },
  39         { MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
  40           MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
  41           V4L2_PIX_FMT_Y12, 12, "Greyscale 12 bpp", },
  42         { MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
  43           MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
  44           V4L2_PIX_FMT_SBGGR8, 8, "BGGR Bayer 8 bpp", },
  45         { MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
  46           MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
  47           V4L2_PIX_FMT_SGBRG8, 8, "GBRG Bayer 8 bpp", },
  48         { MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
  49           MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
  50           V4L2_PIX_FMT_SGRBG8, 8, "GRBG Bayer 8 bpp", },
  51         { MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
  52           MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
  53           V4L2_PIX_FMT_SRGGB8, 8, "RGGB Bayer 8 bpp", },
  54         { MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
  55           MEDIA_BUS_FMT_SGRBG10_1X10, 0,
  56           V4L2_PIX_FMT_SGRBG10DPCM8, 8, "GRBG Bayer 10 bpp DPCM8",  },
  57         { MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
  58           MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
  59           V4L2_PIX_FMT_SBGGR10, 10, "BGGR Bayer 10 bpp", },
  60         { MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
  61           MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
  62           V4L2_PIX_FMT_SGBRG10, 10, "GBRG Bayer 10 bpp", },
  63         { MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
  64           MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
  65           V4L2_PIX_FMT_SGRBG10, 10, "GRBG Bayer 10 bpp", },
  66         { MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
  67           MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
  68           V4L2_PIX_FMT_SRGGB10, 10, "RGGB Bayer 10 bpp", },
  69         { MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
  70           MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
  71           V4L2_PIX_FMT_SBGGR12, 12, "BGGR Bayer 12 bpp", },
  72         { MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
  73           MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
  74           V4L2_PIX_FMT_SGBRG12, 12, "GBRG Bayer 12 bpp", },
  75         { MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
  76           MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
  77           V4L2_PIX_FMT_SGRBG12, 12, "GRBG Bayer 12 bpp", },
  78         { MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
  79           MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
  80           V4L2_PIX_FMT_SRGGB12, 12, "RGGB Bayer 12 bpp", },
  81         { MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
  82           MEDIA_BUS_FMT_UYVY8_1X16, 0,
  83           V4L2_PIX_FMT_UYVY, 16, "YUV 4:2:2 (UYVY)", },
  84         { MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
  85           MEDIA_BUS_FMT_YUYV8_1X16, 0,
  86           V4L2_PIX_FMT_YUYV, 16, "YUV 4:2:2 (YUYV)", },
  87         { MEDIA_BUS_FMT_YUYV8_1_5X8, MEDIA_BUS_FMT_YUYV8_1_5X8,
  88           MEDIA_BUS_FMT_YUYV8_1_5X8, 0,
  89           V4L2_PIX_FMT_NV12, 8, "YUV 4:2:0 (NV12)", },
  90 };
  91
  92 const struct iss_format_info *
  93 omap4iss_video_format_info(u32 code)
  94 {
  95         unsigned int i;
  96
  97         for (i = 0; i < ARRAY_SIZE(formats); ++i) {
  98                 if (formats[i].code == code)
  99                         return &formats[i];
 100         }
 101
 102         return NULL;
 103 }
 104
 105 /*
 106  * iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
 107  * @video: ISS video instance
 108  * @mbus: v4l2_mbus_framefmt format (input)
 109  * @pix: v4l2_pix_format format (output)
 110  *
 111  * Fill the output pix structure with information from the input mbus format.
 112  * The bytesperline and sizeimage fields are computed from the requested bytes
 113  * per line value in the pix format and information from the video instance.
 114  *
 115  * Return the number of padding bytes at end of line.
 116  */
 117 static unsigned int iss_video_mbus_to_pix(const struct iss_video *video,
 118                                           const struct v4l2_mbus_framefmt *mbus,
 119                                           struct v4l2_pix_format *pix)
 120 {
 121         unsigned int bpl = pix->bytesperline;
 122         unsigned int min_bpl;
 123         unsigned int i;
 124
 125         memset(pix, 0, sizeof(*pix));
 126         pix->width = mbus->width;
 127         pix->height = mbus->height;
 128
 129         /* Skip the last format in the loop so that it will be selected if no
 130          * match is found.
 131          */
 132         for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
 133                 if (formats[i].code == mbus->code)
 134                         break;
 135         }
 136
 137         min_bpl = pix->width * ALIGN(formats[i].bpp, 8) / 8;
 138
 139         /* Clamp the requested bytes per line value. If the maximum bytes per
 140          * line value is zero, the module doesn't support user configurable line
 141          * sizes. Override the requested value with the minimum in that case.
 142          */
 143         if (video->bpl_max)
 144                 bpl = clamp(bpl, min_bpl, video->bpl_max);
 145         else
 146                 bpl = min_bpl;
 147
 148         if (!video->bpl_zero_padding || bpl != min_bpl)
 149                 bpl = ALIGN(bpl, video->bpl_alignment);
 150
 151         pix->pixelformat = formats[i].pixelformat;
 152         pix->bytesperline = bpl;
 153         pix->sizeimage = pix->bytesperline * pix->height;
 154         pix->colorspace = mbus->colorspace;
 155         pix->field = mbus->field;
 156
 157         /* FIXME: Special case for NV12! We should make this nicer... */
 158         if (pix->pixelformat == V4L2_PIX_FMT_NV12)
 159                 pix->sizeimage += (pix->bytesperline * pix->height) / 2;
 160
 161         return bpl - min_bpl;
 162 }
 163
 164 static void iss_video_pix_to_mbus(const struct v4l2_pix_format *pix,
 165                                   struct v4l2_mbus_framefmt *mbus)
 166 {
 167         unsigned int i;
 168
 169         memset(mbus, 0, sizeof(*mbus));
 170         mbus->width = pix->width;
 171         mbus->height = pix->height;
 172
 173         /* Skip the last format in the loop so that it will be selected if no
 174          * match is found.
 175          */
 176         for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
 177                 if (formats[i].pixelformat == pix->pixelformat)
 178                         break;
 179         }
 180
 181         mbus->code = formats[i].code;
 182         mbus->colorspace = pix->colorspace;
 183         mbus->field = pix->field;
 184 }
 185
 186 static struct v4l2_subdev *
 187 iss_video_remote_subdev(struct iss_video *video, u32 *pad)
 188 {
 189         struct media_pad *remote;
 190
 191         remote = media_entity_remote_pad(&video->pad);
 192
 193         if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
 194                 return NULL;
 195
 196         if (pad)
 197                 *pad = remote->index;
 198
 199         return media_entity_to_v4l2_subdev(remote->entity);
 200 }
 201
 202 /* Return a pointer to the ISS video instance at the far end of the pipeline. */
 203 static struct iss_video *
 204 iss_video_far_end(struct iss_video *video)
 205 {
 206         struct media_entity_graph graph;
 207         struct media_entity *entity = &video->video.entity;
 208         struct media_device *mdev = entity->graph_obj.mdev;
 209         struct iss_video *far_end = NULL;
 210
 211         mutex_lock(&mdev->graph_mutex);
 212         media_entity_graph_walk_start(&graph, entity);
 213
 214         while ((entity = media_entity_graph_walk_next(&graph))) {
 215                 if (entity == &video->video.entity)
 216                         continue;
 217
 218                 if (!is_media_entity_v4l2_io(entity))
 219                         continue;
 220
 221                 far_end = to_iss_video(media_entity_to_video_device(entity));
 222                 if (far_end->type != video->type)
 223                         break;
 224
 225                 far_end = NULL;
 226         }
 227
 228         mutex_unlock(&mdev->graph_mutex);
 229         return far_end;
 230 }
 231
 232 static int
 233 __iss_video_get_format(struct iss_video *video,
 234                        struct v4l2_mbus_framefmt *format)
 235 {
 236         struct v4l2_subdev_format fmt;
 237         struct v4l2_subdev *subdev;
 238         u32 pad;
 239         int ret;
 240
 241         subdev = iss_video_remote_subdev(video, &pad);
 242         if (!subdev)
 243                 return -EINVAL;
 244
 245         memset(&fmt, 0, sizeof(fmt));
 246         fmt.pad = pad;
 247         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 248
 249         mutex_lock(&video->mutex);
 250         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 251         mutex_unlock(&video->mutex);
 252
 253         if (ret)
 254                 return ret;
 255
 256         *format = fmt.format;
 257         return 0;
 258 }
 259
 260 static int
 261 iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
 262 {
 263         struct v4l2_mbus_framefmt format;
 264         struct v4l2_pix_format pixfmt;
 265         int ret;
 266
 267         ret = __iss_video_get_format(video, &format);
 268         if (ret < 0)
 269                 return ret;
 270
 271         pixfmt.bytesperline = 0;
 272         ret = iss_video_mbus_to_pix(video, &format, &pixfmt);
 273
 274         if (vfh->format.fmt.pix.pixelformat != pixfmt.pixelformat ||
 275             vfh->format.fmt.pix.height != pixfmt.height ||
 276             vfh->format.fmt.pix.width != pixfmt.width ||
 277             vfh->format.fmt.pix.bytesperline != pixfmt.bytesperline ||
 278             vfh->format.fmt.pix.sizeimage != pixfmt.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,
 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, 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 vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 312         struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
 313
 314         if (buffer->iss_addr)
 315                 buffer->iss_addr = 0;
 316 }
 317
 318 static int iss_video_buf_prepare(struct vb2_buffer *vb)
 319 {
 320         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 321         struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
 322         struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
 323         struct iss_video *video = vfh->video;
 324         unsigned long size = vfh->format.fmt.pix.sizeimage;
 325         dma_addr_t addr;
 326
 327         if (vb2_plane_size(vb, 0) < size)
 328                 return -ENOBUFS;
 329
 330         addr = vb2_dma_contig_plane_dma_addr(vb, 0);
 331         if (!IS_ALIGNED(addr, 32)) {
 332                 dev_dbg(video->iss->dev,
 333                         "Buffer address must be aligned to 32 bytes boundary.\n");
 334                 return -EINVAL;
 335         }
 336
 337         vb2_set_plane_payload(vb, 0, size);
 338         buffer->iss_addr = addr;
 339         return 0;
 340 }
 341
 342 static void iss_video_buf_queue(struct vb2_buffer *vb)
 343 {
 344         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 345         struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
 346         struct iss_video *video = vfh->video;
 347         struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
 348         struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
 349         unsigned long flags;
 350         bool empty;
 351
 352         spin_lock_irqsave(&video->qlock, flags);
 353
 354         /* Mark the buffer is faulty and give it back to the queue immediately
 355          * if the video node has registered an error. vb2 will perform the same
 356          * check when preparing the buffer, but that is inherently racy, so we
 357          * need to handle the race condition with an authoritative check here.
 358          */
 359         if (unlikely(video->error)) {
 360                 vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
 361                 spin_unlock_irqrestore(&video->qlock, flags);
 362                 return;
 363         }
 364
 365         empty = list_empty(&video->dmaqueue);
 366         list_add_tail(&buffer->list, &video->dmaqueue);
 367
 368         spin_unlock_irqrestore(&video->qlock, flags);
 369
 370         if (empty) {
 371                 enum iss_pipeline_state state;
 372                 unsigned int start;
 373
 374                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 375                         state = ISS_PIPELINE_QUEUE_OUTPUT;
 376                 else
 377                         state = ISS_PIPELINE_QUEUE_INPUT;
 378
 379                 spin_lock_irqsave(&pipe->lock, flags);
 380                 pipe->state |= state;
 381                 video->ops->queue(video, buffer);
 382                 video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
 383
 384                 start = iss_pipeline_ready(pipe);
 385                 if (start)
 386                         pipe->state |= ISS_PIPELINE_STREAM;
 387                 spin_unlock_irqrestore(&pipe->lock, flags);
 388
 389                 if (start)
 390                         omap4iss_pipeline_set_stream(pipe,
 391                                                 ISS_PIPELINE_STREAM_SINGLESHOT);
 392         }
 393 }
 394
 395 static const struct vb2_ops iss_video_vb2ops = {
 396         .queue_setup    = iss_video_queue_setup,
 397         .buf_prepare    = iss_video_buf_prepare,
 398         .buf_queue      = iss_video_buf_queue,
 399         .buf_cleanup    = iss_video_buf_cleanup,
 400 };
 401
 402 /*
 403  * omap4iss_video_buffer_next - Complete the current buffer and return the next
 404  * @video: ISS video object
 405  *
 406  * Remove the current video buffer from the DMA queue and fill its timestamp,
 407  * field count and state fields before waking up its completion handler.
 408  *
 409  * For capture video nodes, the buffer state is set to VB2_BUF_STATE_DONE if no
 410  * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
 411  *
 412  * The DMA queue is expected to contain at least one buffer.
 413  *
 414  * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
 415  * empty.
 416  */
 417 struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
 418 {
 419         struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
 420         enum iss_pipeline_state state;
 421         struct iss_buffer *buf;
 422         unsigned long flags;
 423
 424         spin_lock_irqsave(&video->qlock, flags);
 425         if (WARN_ON(list_empty(&video->dmaqueue))) {
 426                 spin_unlock_irqrestore(&video->qlock, flags);
 427                 return NULL;
 428         }
 429
 430         buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
 431                                list);
 432         list_del(&buf->list);
 433         spin_unlock_irqrestore(&video->qlock, flags);
 434
 435         buf->vb.vb2_buf.timestamp = ktime_get_ns();
 436
 437         /* Do frame number propagation only if this is the output video node.
 438          * Frame number either comes from the CSI receivers or it gets
 439          * incremented here if H3A is not active.
 440          * Note: There is no guarantee that the output buffer will finish
 441          * first, so the input number might lag behind by 1 in some cases.
 442          */
 443         if (video == pipe->output && !pipe->do_propagation)
 444                 buf->vb.sequence =
 445                         atomic_inc_return(&pipe->frame_number);
 446         else
 447                 buf->vb.sequence = atomic_read(&pipe->frame_number);
 448
 449         vb2_buffer_done(&buf->vb.vb2_buf, pipe->error ?
 450                         VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 451         pipe->error = false;
 452
 453         spin_lock_irqsave(&video->qlock, flags);
 454         if (list_empty(&video->dmaqueue)) {
 455                 spin_unlock_irqrestore(&video->qlock, flags);
 456                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 457                         state = ISS_PIPELINE_QUEUE_OUTPUT
 458                               | ISS_PIPELINE_STREAM;
 459                 else
 460                         state = ISS_PIPELINE_QUEUE_INPUT
 461                               | ISS_PIPELINE_STREAM;
 462
 463                 spin_lock_irqsave(&pipe->lock, flags);
 464                 pipe->state &= ~state;
 465                 if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
 466                         video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
 467                 spin_unlock_irqrestore(&pipe->lock, flags);
 468                 return NULL;
 469         }
 470
 471         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input) {
 472                 spin_lock(&pipe->lock);
 473                 pipe->state &= ~ISS_PIPELINE_STREAM;
 474                 spin_unlock(&pipe->lock);
 475         }
 476
 477         buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
 478                                list);
 479         spin_unlock_irqrestore(&video->qlock, flags);
 480         buf->vb.vb2_buf.state = VB2_BUF_STATE_ACTIVE;
 481         return buf;
 482 }
 483
 484 /*
 485  * omap4iss_video_cancel_stream - Cancel stream on a video node
 486  * @video: ISS video object
 487  *
 488  * Cancelling a stream mark all buffers on the video node as erroneous and makes
 489  * sure no new buffer can be queued.
 490  */
 491 void omap4iss_video_cancel_stream(struct iss_video *video)
 492 {
 493         unsigned long flags;
 494
 495         spin_lock_irqsave(&video->qlock, flags);
 496
 497         while (!list_empty(&video->dmaqueue)) {
 498                 struct iss_buffer *buf;
 499
 500                 buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
 501                                        list);
 502                 list_del(&buf->list);
 503                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 504         }
 505
 506         vb2_queue_error(video->queue);
 507         video->error = true;
 508
 509         spin_unlock_irqrestore(&video->qlock, flags);
 510 }
 511
 512 /* -----------------------------------------------------------------------------
 513  * V4L2 ioctls
 514  */
 515
 516 static int
 517 iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 518 {
 519         struct iss_video *video = video_drvdata(file);
 520
 521         strlcpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
 522         strlcpy(cap->card, video->video.name, sizeof(cap->card));
 523         strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));
 524
 525         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 526                 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
 527         else
 528                 cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
 529
 530         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 531                           | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT;
 532
 533         return 0;
 534 }
 535
 536 static int
 537 iss_video_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
 538 {
 539         struct iss_video *video = video_drvdata(file);
 540         struct v4l2_mbus_framefmt format;
 541         unsigned int index = f->index;
 542         unsigned int i;
 543         int ret;
 544
 545         if (f->type != video->type)
 546                 return -EINVAL;
 547
 548         ret = __iss_video_get_format(video, &format);
 549         if (ret < 0)
 550                 return ret;
 551
 552         for (i = 0; i < ARRAY_SIZE(formats); ++i) {
 553                 const struct iss_format_info *info = &formats[i];
 554
 555                 if (format.code != info->code)
 556                         continue;
 557
 558                 if (index == 0) {
 559                         f->pixelformat = info->pixelformat;
 560                         strlcpy(f->description, info->description,
 561                                 sizeof(f->description));
 562                         return 0;
 563                 }
 564
 565                 index--;
 566         }
 567
 568         return -EINVAL;
 569 }
 570
 571 static int
 572 iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
 573 {
 574         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 575         struct iss_video *video = video_drvdata(file);
 576
 577         if (format->type != video->type)
 578                 return -EINVAL;
 579
 580         mutex_lock(&video->mutex);
 581         *format = vfh->format;
 582         mutex_unlock(&video->mutex);
 583
 584         return 0;
 585 }
 586
 587 static int
 588 iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
 589 {
 590         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 591         struct iss_video *video = video_drvdata(file);
 592         struct v4l2_mbus_framefmt fmt;
 593
 594         if (format->type != video->type)
 595                 return -EINVAL;
 596
 597         mutex_lock(&video->mutex);
 598
 599         /* Fill the bytesperline and sizeimage fields by converting to media bus
 600          * format and back to pixel format.
 601          */
 602         iss_video_pix_to_mbus(&format->fmt.pix, &fmt);
 603         iss_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
 604
 605         vfh->format = *format;
 606
 607         mutex_unlock(&video->mutex);
 608         return 0;
 609 }
 610
 611 static int
 612 iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
 613 {
 614         struct iss_video *video = video_drvdata(file);
 615         struct v4l2_subdev_format fmt;
 616         struct v4l2_subdev *subdev;
 617         u32 pad;
 618         int ret;
 619
 620         if (format->type != video->type)
 621                 return -EINVAL;
 622
 623         subdev = iss_video_remote_subdev(video, &pad);
 624         if (!subdev)
 625                 return -EINVAL;
 626
 627         iss_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
 628
 629         fmt.pad = pad;
 630         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 631         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 632         if (ret)
 633                 return ret;
 634
 635         iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
 636         return 0;
 637 }
 638
 639 static int
 640 iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 641 {
 642         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 643         struct iss_video *video = video_drvdata(file);
 644
 645         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 646             video->type != a->type)
 647                 return -EINVAL;
 648
 649         memset(a, 0, sizeof(*a));
 650         a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 651         a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 652         a->parm.output.timeperframe = vfh->timeperframe;
 653
 654         return 0;
 655 }
 656
 657 static int
 658 iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 659 {
 660         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 661         struct iss_video *video = video_drvdata(file);
 662
 663         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 664             video->type != a->type)
 665                 return -EINVAL;
 666
 667         if (a->parm.output.timeperframe.denominator == 0)
 668                 a->parm.output.timeperframe.denominator = 1;
 669
 670         vfh->timeperframe = a->parm.output.timeperframe;
 671
 672         return 0;
 673 }
 674
 675 static int
 676 iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
 677 {
 678         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 679
 680         return vb2_reqbufs(&vfh->queue, rb);
 681 }
 682
 683 static int
 684 iss_video_querybuf(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_querybuf(&vfh->queue, b);
 689 }
 690
 691 static int
 692 iss_video_qbuf(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_qbuf(&vfh->queue, b);
 697 }
 698
 699 static int
 700 iss_video_expbuf(struct file *file, void *fh, struct v4l2_exportbuffer *e)
 701 {
 702         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 703
 704         return vb2_expbuf(&vfh->queue, e);
 705 }
 706
 707 static int
 708 iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 709 {
 710         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 711
 712         return vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
 713 }
 714
 715 /*
 716  * Stream management
 717  *
 718  * Every ISS pipeline has a single input and a single output. The input can be
 719  * either a sensor or a video node. The output is always a video node.
 720  *
 721  * As every pipeline has an output video node, the ISS video objects at the
 722  * pipeline output stores the pipeline state. It tracks the streaming state of
 723  * both the input and output, as well as the availability of buffers.
 724  *
 725  * In sensor-to-memory mode, frames are always available at the pipeline input.
 726  * Starting the sensor usually requires I2C transfers and must be done in
 727  * interruptible context. The pipeline is started and stopped synchronously
 728  * to the stream on/off commands. All modules in the pipeline will get their
 729  * subdev set stream handler called. The module at the end of the pipeline must
 730  * delay starting the hardware until buffers are available at its output.
 731  *
 732  * In memory-to-memory mode, starting/stopping the stream requires
 733  * synchronization between the input and output. ISS modules can't be stopped
 734  * in the middle of a frame, and at least some of the modules seem to become
 735  * busy as soon as they're started, even if they don't receive a frame start
 736  * event. For that reason frames need to be processed in single-shot mode. The
 737  * driver needs to wait until a frame is completely processed and written to
 738  * memory before restarting the pipeline for the next frame. Pipelined
 739  * processing might be possible but requires more testing.
 740  *
 741  * Stream start must be delayed until buffers are available at both the input
 742  * and output. The pipeline must be started in the videobuf queue callback with
 743  * the buffers queue spinlock held. The modules subdev set stream operation must
 744  * not sleep.
 745  */
 746 static int
 747 iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 748 {
 749         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 750         struct iss_video *video = video_drvdata(file);
 751         struct media_entity_graph graph;
 752         struct media_entity *entity;
 753         enum iss_pipeline_state state;
 754         struct iss_pipeline *pipe;
 755         struct iss_video *far_end;
 756         unsigned long flags;
 757         int ret;
 758
 759         if (type != video->type)
 760                 return -EINVAL;
 761
 762         mutex_lock(&video->stream_lock);
 763
 764         /* Start streaming on the pipeline. No link touching an entity in the
 765          * pipeline can be activated or deactivated once streaming is started.
 766          */
 767         pipe = video->video.entity.pipe
 768              ? to_iss_pipeline(&video->video.entity) : &video->pipe;
 769         pipe->external = NULL;
 770         pipe->external_rate = 0;
 771         pipe->external_bpp = 0;
 772         pipe->entities = 0;
 773
 774         if (video->iss->pdata->set_constraints)
 775                 video->iss->pdata->set_constraints(video->iss, true);
 776
 777         ret = media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
 778         if (ret < 0)
 779                 goto err_media_entity_pipeline_start;
 780
 781         entity = &video->video.entity;
 782         media_entity_graph_walk_start(&graph, entity);
 783         while ((entity = media_entity_graph_walk_next(&graph)))
 784                 pipe->entities |= 1 << media_entity_id(entity);
 785
 786         /* Verify that the currently configured format matches the output of
 787          * the connected subdev.
 788          */
 789         ret = iss_video_check_format(video, vfh);
 790         if (ret < 0)
 791                 goto err_iss_video_check_format;
 792
 793         video->bpl_padding = ret;
 794         video->bpl_value = vfh->format.fmt.pix.bytesperline;
 795
 796         /* Find the ISS video node connected at the far end of the pipeline and
 797          * update the pipeline.
 798          */
 799         far_end = iss_video_far_end(video);
 800
 801         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 802                 state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
 803                 pipe->input = far_end;
 804                 pipe->output = video;
 805         } else {
 806                 if (!far_end) {
 807                         ret = -EPIPE;
 808                         goto err_iss_video_check_format;
 809                 }
 810
 811                 state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
 812                 pipe->input = video;
 813                 pipe->output = far_end;
 814         }
 815
 816         spin_lock_irqsave(&pipe->lock, flags);
 817         pipe->state &= ~ISS_PIPELINE_STREAM;
 818         pipe->state |= state;
 819         spin_unlock_irqrestore(&pipe->lock, flags);
 820
 821         /* Set the maximum time per frame as the value requested by userspace.
 822          * This is a soft limit that can be overridden if the hardware doesn't
 823          * support the request limit.
 824          */
 825         if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 826                 pipe->max_timeperframe = vfh->timeperframe;
 827
 828         video->queue = &vfh->queue;
 829         INIT_LIST_HEAD(&video->dmaqueue);
 830         video->error = false;
 831         atomic_set(&pipe->frame_number, -1);
 832
 833         ret = vb2_streamon(&vfh->queue, type);
 834         if (ret < 0)
 835                 goto err_iss_video_check_format;
 836
 837         /* In sensor-to-memory mode, the stream can be started synchronously
 838          * to the stream on command. In memory-to-memory mode, it will be
 839          * started when buffers are queued on both the input and output.
 840          */
 841         if (!pipe->input) {
 842                 unsigned long flags;
 843
 844                 ret = omap4iss_pipeline_set_stream(pipe,
 845                                               ISS_PIPELINE_STREAM_CONTINUOUS);
 846                 if (ret < 0)
 847                         goto err_omap4iss_set_stream;
 848                 spin_lock_irqsave(&video->qlock, flags);
 849                 if (list_empty(&video->dmaqueue))
 850                         video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
 851                 spin_unlock_irqrestore(&video->qlock, flags);
 852         }
 853
 854         mutex_unlock(&video->stream_lock);
 855         return 0;
 856
 857 err_omap4iss_set_stream:
 858         vb2_streamoff(&vfh->queue, type);
 859 err_iss_video_check_format:
 860         media_entity_pipeline_stop(&video->video.entity);
 861 err_media_entity_pipeline_start:
 862         if (video->iss->pdata->set_constraints)
 863                 video->iss->pdata->set_constraints(video->iss, false);
 864         video->queue = NULL;
 865
 866         mutex_unlock(&video->stream_lock);
 867         return ret;
 868 }
 869
 870 static int
 871 iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 872 {
 873         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 874         struct iss_video *video = video_drvdata(file);
 875         struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
 876         enum iss_pipeline_state state;
 877         unsigned long flags;
 878
 879         if (type != video->type)
 880                 return -EINVAL;
 881
 882         mutex_lock(&video->stream_lock);
 883
 884         if (!vb2_is_streaming(&vfh->queue))
 885                 goto done;
 886
 887         /* Update the pipeline state. */
 888         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 889                 state = ISS_PIPELINE_STREAM_OUTPUT
 890                       | ISS_PIPELINE_QUEUE_OUTPUT;
 891         else
 892                 state = ISS_PIPELINE_STREAM_INPUT
 893                       | ISS_PIPELINE_QUEUE_INPUT;
 894
 895         spin_lock_irqsave(&pipe->lock, flags);
 896         pipe->state &= ~state;
 897         spin_unlock_irqrestore(&pipe->lock, flags);
 898
 899         /* Stop the stream. */
 900         omap4iss_pipeline_set_stream(pipe, ISS_PIPELINE_STREAM_STOPPED);
 901         vb2_streamoff(&vfh->queue, type);
 902         video->queue = NULL;
 903
 904         if (video->iss->pdata->set_constraints)
 905                 video->iss->pdata->set_constraints(video->iss, false);
 906         media_entity_pipeline_stop(&video->video.entity);
 907
 908 done:
 909         mutex_unlock(&video->stream_lock);
 910         return 0;
 911 }
 912
 913 static int
 914 iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
 915 {
 916         if (input->index > 0)
 917                 return -EINVAL;
 918
 919         strlcpy(input->name, "camera", sizeof(input->name));
 920         input->type = V4L2_INPUT_TYPE_CAMERA;
 921
 922         return 0;
 923 }
 924
 925 static int
 926 iss_video_g_input(struct file *file, void *fh, unsigned int *input)
 927 {
 928         *input = 0;
 929
 930         return 0;
 931 }
 932
 933 static int
 934 iss_video_s_input(struct file *file, void *fh, unsigned int input)
 935 {
 936         return input == 0 ? 0 : -EINVAL;
 937 }
 938
 939 static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
 940         .vidioc_querycap                = iss_video_querycap,
 941         .vidioc_enum_fmt_vid_cap        = iss_video_enum_format,
 942         .vidioc_g_fmt_vid_cap           = iss_video_get_format,
 943         .vidioc_s_fmt_vid_cap           = iss_video_set_format,
 944         .vidioc_try_fmt_vid_cap         = iss_video_try_format,
 945         .vidioc_g_fmt_vid_out           = iss_video_get_format,
 946         .vidioc_s_fmt_vid_out           = iss_video_set_format,
 947         .vidioc_try_fmt_vid_out         = iss_video_try_format,
 948         .vidioc_g_parm                  = iss_video_get_param,
 949         .vidioc_s_parm                  = iss_video_set_param,
 950         .vidioc_reqbufs                 = iss_video_reqbufs,
 951         .vidioc_querybuf                = iss_video_querybuf,
 952         .vidioc_qbuf                    = iss_video_qbuf,
 953         .vidioc_expbuf                  = iss_video_expbuf,
 954         .vidioc_dqbuf                   = iss_video_dqbuf,
 955         .vidioc_streamon                = iss_video_streamon,
 956         .vidioc_streamoff               = iss_video_streamoff,
 957         .vidioc_enum_input              = iss_video_enum_input,
 958         .vidioc_g_input                 = iss_video_g_input,
 959         .vidioc_s_input                 = iss_video_s_input,
 960 };
 961
 962 /* -----------------------------------------------------------------------------
 963  * V4L2 file operations
 964  */
 965
 966 static int iss_video_open(struct file *file)
 967 {
 968         struct iss_video *video = video_drvdata(file);
 969         struct iss_video_fh *handle;
 970         struct vb2_queue *q;
 971         int ret = 0;
 972
 973         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
 974         if (!handle)
 975                 return -ENOMEM;
 976
 977         v4l2_fh_init(&handle->vfh, &video->video);
 978         v4l2_fh_add(&handle->vfh);
 979
 980         /* If this is the first user, initialise the pipeline. */
 981         if (!omap4iss_get(video->iss)) {
 982                 ret = -EBUSY;
 983                 goto done;
 984         }
 985
 986         ret = omap4iss_pipeline_pm_use(&video->video.entity, 1);
 987         if (ret < 0) {
 988                 omap4iss_put(video->iss);
 989                 goto done;
 990         }
 991
 992         video->alloc_ctx = vb2_dma_contig_init_ctx(video->iss->dev);
 993         if (IS_ERR(video->alloc_ctx)) {
 994                 ret = PTR_ERR(video->alloc_ctx);
 995                 omap4iss_put(video->iss);
 996                 goto done;
 997         }
 998
 999         q = &handle->queue;
1000
1001         q->type = video->type;
1002         q->io_modes = VB2_MMAP | VB2_DMABUF;
1003         q->drv_priv = handle;
1004         q->ops = &iss_video_vb2ops;
1005         q->mem_ops = &vb2_dma_contig_memops;
1006         q->buf_struct_size = sizeof(struct iss_buffer);
1007         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1008
1009         ret = vb2_queue_init(q);
1010         if (ret) {
1011                 omap4iss_put(video->iss);
1012                 goto done;
1013         }
1014
1015         memset(&handle->format, 0, sizeof(handle->format));
1016         handle->format.type = video->type;
1017         handle->timeperframe.denominator = 1;
1018
1019         handle->video = video;
1020         file->private_data = &handle->vfh;
1021
1022 done:
1023         if (ret < 0) {
1024                 v4l2_fh_del(&handle->vfh);
1025                 kfree(handle);
1026         }
1027
1028         return ret;
1029 }
1030
1031 static int iss_video_release(struct file *file)
1032 {
1033         struct iss_video *video = video_drvdata(file);
1034         struct v4l2_fh *vfh = file->private_data;
1035         struct iss_video_fh *handle = to_iss_video_fh(vfh);
1036
1037         /* Disable streaming and free the buffers queue resources. */
1038         iss_video_streamoff(file, vfh, video->type);
1039
1040         omap4iss_pipeline_pm_use(&video->video.entity, 0);
1041
1042         /* Release the videobuf2 queue */
1043         vb2_queue_release(&handle->queue);
1044
1045         /* Release the file handle. */
1046         v4l2_fh_del(vfh);
1047         kfree(handle);
1048         file->private_data = NULL;
1049
1050         omap4iss_put(video->iss);
1051
1052         return 0;
1053 }
1054
1055 static unsigned int iss_video_poll(struct file *file, poll_table *wait)
1056 {
1057         struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1058
1059         return vb2_poll(&vfh->queue, file, wait);
1060 }
1061
1062 static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
1063 {
1064         struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1065
1066         return vb2_mmap(&vfh->queue, vma);
1067 }
1068
1069 static struct v4l2_file_operations iss_video_fops = {
1070         .owner = THIS_MODULE,
1071         .unlocked_ioctl = video_ioctl2,
1072         .open = iss_video_open,
1073         .release = iss_video_release,
1074         .poll = iss_video_poll,
1075         .mmap = iss_video_mmap,
1076 };
1077
1078 /* -----------------------------------------------------------------------------
1079  * ISS video core
1080  */
1081
1082 static const struct iss_video_operations iss_video_dummy_ops = {
1083 };
1084
1085 int omap4iss_video_init(struct iss_video *video, const char *name)
1086 {
1087         const char *direction;
1088         int ret;
1089
1090         switch (video->type) {
1091         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1092                 direction = "output";
1093                 video->pad.flags = MEDIA_PAD_FL_SINK;
1094                 break;
1095         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1096                 direction = "input";
1097                 video->pad.flags = MEDIA_PAD_FL_SOURCE;
1098                 break;
1099
1100         default:
1101                 return -EINVAL;
1102         }
1103
1104         ret = media_entity_init(&video->video.entity, 1, &video->pad);
1105         if (ret < 0)
1106                 return ret;
1107
1108         spin_lock_init(&video->qlock);
1109         mutex_init(&video->mutex);
1110         atomic_set(&video->active, 0);
1111
1112         spin_lock_init(&video->pipe.lock);
1113         mutex_init(&video->stream_lock);
1114
1115         /* Initialize the video device. */
1116         if (!video->ops)
1117                 video->ops = &iss_video_dummy_ops;
1118
1119         video->video.fops = &iss_video_fops;
1120         snprintf(video->video.name, sizeof(video->video.name),
1121                  "OMAP4 ISS %s %s", name, direction);
1122         video->video.vfl_type = VFL_TYPE_GRABBER;
1123         video->video.release = video_device_release_empty;
1124         video->video.ioctl_ops = &iss_video_ioctl_ops;
1125         video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
1126
1127         video_set_drvdata(&video->video, video);
1128
1129         return 0;
1130 }
1131
1132 void omap4iss_video_cleanup(struct iss_video *video)
1133 {
1134         media_entity_cleanup(&video->video.entity);
1135         mutex_destroy(&video->stream_lock);
1136         mutex_destroy(&video->mutex);
1137 }
1138
1139 int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
1140 {
1141         int ret;
1142
1143         video->video.v4l2_dev = vdev;
1144
1145         ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1146         if (ret < 0)
1147                 dev_err(video->iss->dev,
1148                         "could not register video device (%d)\n", ret);
1149
1150         return ret;
1151 }
1152
1153 void omap4iss_video_unregister(struct iss_video *video)
1154 {
1155         video_unregister_device(&video->video);
1156 }