drivers/staging/media/omap4iss/iss

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This source file includes following definitions.
omap4iss_video_format_info
iss_video_mbus_to_pix
iss_video_pix_to_mbus
iss_video_remote_subdev
iss_video_far_end
__iss_video_get_format
iss_video_check_format
iss_video_queue_setup
iss_video_buf_cleanup
iss_video_buf_prepare
iss_video_buf_queue
omap4iss_video_buffer_next
omap4iss_video_cancel_stream
iss_video_querycap
iss_video_enum_format
iss_video_get_format
iss_video_set_format
iss_video_try_format
iss_video_get_selection
iss_video_set_selection
iss_video_get_param
iss_video_set_param
iss_video_reqbufs
iss_video_querybuf
iss_video_qbuf
iss_video_expbuf
iss_video_dqbuf
iss_video_streamon
iss_video_streamoff
iss_video_enum_input
iss_video_g_input
iss_video_s_input
iss_video_open
iss_video_release
iss_video_poll
iss_video_mmap
omap4iss_video_init
omap4iss_video_cleanup
omap4iss_video_register
omap4iss_video_unregister
   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * TI OMAP4 ISS V4L2 Driver - Generic video node
   4  *
   5  * Copyright (C) 2012 Texas Instruments, Inc.
   6  *
   7  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
   8  */
   9 
  10 #include <linux/clk.h>
  11 #include <linux/mm.h>
  12 #include <linux/pagemap.h>
  13 #include <linux/sched.h>
  14 #include <linux/slab.h>
  15 #include <linux/vmalloc.h>
  16 #include <linux/module.h>
  17 
  18 #include <media/v4l2-dev.h>
  19 #include <media/v4l2-ioctl.h>
  20 #include <media/v4l2-mc.h>
  21 
  22 #include <asm/cacheflush.h>
  23 
  24 #include "iss_video.h"
  25 #include "iss.h"
  26 
  27 /* -----------------------------------------------------------------------------
  28  * Helper functions
  29  */
  30 
  31 static struct iss_format_info formats[] = {
  32         { MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
  33           MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
  34           V4L2_PIX_FMT_GREY, 8, },
  35         { MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
  36           MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
  37           V4L2_PIX_FMT_Y10, 10, },
  38         { MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
  39           MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
  40           V4L2_PIX_FMT_Y12, 12, },
  41         { MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
  42           MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
  43           V4L2_PIX_FMT_SBGGR8, 8, },
  44         { MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
  45           MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
  46           V4L2_PIX_FMT_SGBRG8, 8, },
  47         { MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
  48           MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
  49           V4L2_PIX_FMT_SGRBG8, 8, },
  50         { MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
  51           MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
  52           V4L2_PIX_FMT_SRGGB8, 8, },
  53         { MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
  54           MEDIA_BUS_FMT_SGRBG10_1X10, 0,
  55           V4L2_PIX_FMT_SGRBG10DPCM8, 8, },
  56         { MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
  57           MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
  58           V4L2_PIX_FMT_SBGGR10, 10, },
  59         { MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
  60           MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
  61           V4L2_PIX_FMT_SGBRG10, 10, },
  62         { MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
  63           MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
  64           V4L2_PIX_FMT_SGRBG10, 10, },
  65         { MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
  66           MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
  67           V4L2_PIX_FMT_SRGGB10, 10, },
  68         { MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
  69           MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
  70           V4L2_PIX_FMT_SBGGR12, 12, },
  71         { MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
  72           MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
  73           V4L2_PIX_FMT_SGBRG12, 12, },
  74         { MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
  75           MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
  76           V4L2_PIX_FMT_SGRBG12, 12, },
  77         { MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
  78           MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
  79           V4L2_PIX_FMT_SRGGB12, 12, },
  80         { MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
  81           MEDIA_BUS_FMT_UYVY8_1X16, 0,
  82           V4L2_PIX_FMT_UYVY, 16, },
  83         { MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
  84           MEDIA_BUS_FMT_YUYV8_1X16, 0,
  85           V4L2_PIX_FMT_YUYV, 16, },
  86         { MEDIA_BUS_FMT_YUYV8_1_5X8, MEDIA_BUS_FMT_YUYV8_1_5X8,
  87           MEDIA_BUS_FMT_YUYV8_1_5X8, 0,
  88           V4L2_PIX_FMT_NV12, 8, },
  89 };
  90 
  91 const struct iss_format_info *
  92 omap4iss_video_format_info(u32 code)
  93 {
  94         unsigned int i;
  95 
  96         for (i = 0; i < ARRAY_SIZE(formats); ++i) {
  97                 if (formats[i].code == code)
  98                         return &formats[i];
  99         }
 100 
 101         return NULL;
 102 }
 103 
 104 /*
 105  * iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
 106  * @video: ISS video instance
 107  * @mbus: v4l2_mbus_framefmt format (input)
 108  * @pix: v4l2_pix_format format (output)
 109  *
 110  * Fill the output pix structure with information from the input mbus format.
 111  * The bytesperline and sizeimage fields are computed from the requested bytes
 112  * per line value in the pix format and information from the video instance.
 113  *
 114  * Return the number of padding bytes at end of line.
 115  */
 116 static unsigned int iss_video_mbus_to_pix(const struct iss_video *video,
 117                                           const struct v4l2_mbus_framefmt *mbus,
 118                                           struct v4l2_pix_format *pix)
 119 {
 120         unsigned int bpl = pix->bytesperline;
 121         unsigned int min_bpl;
 122         unsigned int i;
 123 
 124         memset(pix, 0, sizeof(*pix));
 125         pix->width = mbus->width;
 126         pix->height = mbus->height;
 127 
 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         /*
 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         /*
 175          * Skip the last format in the loop so that it will be selected if no
 176          * match is found.
 177          */
 178         for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
 179                 if (formats[i].pixelformat == pix->pixelformat)
 180                         break;
 181         }
 182 
 183         mbus->code = formats[i].code;
 184         mbus->colorspace = pix->colorspace;
 185         mbus->field = pix->field;
 186 }
 187 
 188 static struct v4l2_subdev *
 189 iss_video_remote_subdev(struct iss_video *video, u32 *pad)
 190 {
 191         struct media_pad *remote;
 192 
 193         remote = media_entity_remote_pad(&video->pad);
 194 
 195         if (!remote || !is_media_entity_v4l2_subdev(remote->entity))
 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_graph graph;
 209         struct media_entity *entity = &video->video.entity;
 210         struct media_device *mdev = entity->graph_obj.mdev;
 211         struct iss_video *far_end = NULL;
 212 
 213         mutex_lock(&mdev->graph_mutex);
 214 
 215         if (media_graph_walk_init(&graph, mdev)) {
 216                 mutex_unlock(&mdev->graph_mutex);
 217                 return NULL;
 218         }
 219 
 220         media_graph_walk_start(&graph, entity);
 221 
 222         while ((entity = media_graph_walk_next(&graph))) {
 223                 if (entity == &video->video.entity)
 224                         continue;
 225 
 226                 if (!is_media_entity_v4l2_video_device(entity))
 227                         continue;
 228 
 229                 far_end = to_iss_video(media_entity_to_video_device(entity));
 230                 if (far_end->type != video->type)
 231                         break;
 232 
 233                 far_end = NULL;
 234         }
 235 
 236         mutex_unlock(&mdev->graph_mutex);
 237 
 238         media_graph_walk_cleanup(&graph);
 239 
 240         return far_end;
 241 }
 242 
 243 static int
 244 __iss_video_get_format(struct iss_video *video,
 245                        struct v4l2_mbus_framefmt *format)
 246 {
 247         struct v4l2_subdev_format fmt;
 248         struct v4l2_subdev *subdev;
 249         u32 pad;
 250         int ret;
 251 
 252         subdev = iss_video_remote_subdev(video, &pad);
 253         if (!subdev)
 254                 return -EINVAL;
 255 
 256         memset(&fmt, 0, sizeof(fmt));
 257         fmt.pad = pad;
 258         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 259 
 260         mutex_lock(&video->mutex);
 261         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 262         mutex_unlock(&video->mutex);
 263 
 264         if (ret)
 265                 return ret;
 266 
 267         *format = fmt.format;
 268         return 0;
 269 }
 270 
 271 static int
 272 iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
 273 {
 274         struct v4l2_mbus_framefmt format;
 275         struct v4l2_pix_format pixfmt;
 276         int ret;
 277 
 278         ret = __iss_video_get_format(video, &format);
 279         if (ret < 0)
 280                 return ret;
 281 
 282         pixfmt.bytesperline = 0;
 283         ret = iss_video_mbus_to_pix(video, &format, &pixfmt);
 284 
 285         if (vfh->format.fmt.pix.pixelformat != pixfmt.pixelformat ||
 286             vfh->format.fmt.pix.height != pixfmt.height ||
 287             vfh->format.fmt.pix.width != pixfmt.width ||
 288             vfh->format.fmt.pix.bytesperline != pixfmt.bytesperline ||
 289             vfh->format.fmt.pix.sizeimage != pixfmt.sizeimage)
 290                 return -EINVAL;
 291 
 292         return ret;
 293 }
 294 
 295 /* -----------------------------------------------------------------------------
 296  * Video queue operations
 297  */
 298 
 299 static int iss_video_queue_setup(struct vb2_queue *vq,
 300                                  unsigned int *count, unsigned int *num_planes,
 301                                  unsigned int sizes[],
 302                                  struct device *alloc_devs[])
 303 {
 304         struct iss_video_fh *vfh = vb2_get_drv_priv(vq);
 305         struct iss_video *video = vfh->video;
 306 
 307         /* Revisit multi-planar support for NV12 */
 308         *num_planes = 1;
 309 
 310         sizes[0] = vfh->format.fmt.pix.sizeimage;
 311         if (sizes[0] == 0)
 312                 return -EINVAL;
 313 
 314         *count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));
 315 
 316         return 0;
 317 }
 318 
 319 static void iss_video_buf_cleanup(struct vb2_buffer *vb)
 320 {
 321         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 322         struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
 323 
 324         if (buffer->iss_addr)
 325                 buffer->iss_addr = 0;
 326 }
 327 
 328 static int iss_video_buf_prepare(struct vb2_buffer *vb)
 329 {
 330         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 331         struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
 332         struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
 333         struct iss_video *video = vfh->video;
 334         unsigned long size = vfh->format.fmt.pix.sizeimage;
 335         dma_addr_t addr;
 336 
 337         if (vb2_plane_size(vb, 0) < size)
 338                 return -ENOBUFS;
 339 
 340         addr = vb2_dma_contig_plane_dma_addr(vb, 0);
 341         if (!IS_ALIGNED(addr, 32)) {
 342                 dev_dbg(video->iss->dev,
 343                         "Buffer address must be aligned to 32 bytes boundary.\n");
 344                 return -EINVAL;
 345         }
 346 
 347         vb2_set_plane_payload(vb, 0, size);
 348         buffer->iss_addr = addr;
 349         return 0;
 350 }
 351 
 352 static void iss_video_buf_queue(struct vb2_buffer *vb)
 353 {
 354         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 355         struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
 356         struct iss_video *video = vfh->video;
 357         struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb);
 358         struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
 359         unsigned long flags;
 360         bool empty;
 361 
 362         spin_lock_irqsave(&video->qlock, flags);
 363 
 364         /*
 365          * Mark the buffer is faulty and give it back to the queue immediately
 366          * if the video node has registered an error. vb2 will perform the same
 367          * check when preparing the buffer, but that is inherently racy, so we
 368          * need to handle the race condition with an authoritative check here.
 369          */
 370         if (unlikely(video->error)) {
 371                 vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
 372                 spin_unlock_irqrestore(&video->qlock, flags);
 373                 return;
 374         }
 375 
 376         empty = list_empty(&video->dmaqueue);
 377         list_add_tail(&buffer->list, &video->dmaqueue);
 378 
 379         spin_unlock_irqrestore(&video->qlock, flags);
 380 
 381         if (empty) {
 382                 enum iss_pipeline_state state;
 383                 unsigned int start;
 384 
 385                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 386                         state = ISS_PIPELINE_QUEUE_OUTPUT;
 387                 else
 388                         state = ISS_PIPELINE_QUEUE_INPUT;
 389 
 390                 spin_lock_irqsave(&pipe->lock, flags);
 391                 pipe->state |= state;
 392                 video->ops->queue(video, buffer);
 393                 video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
 394 
 395                 start = iss_pipeline_ready(pipe);
 396                 if (start)
 397                         pipe->state |= ISS_PIPELINE_STREAM;
 398                 spin_unlock_irqrestore(&pipe->lock, flags);
 399 
 400                 if (start)
 401                         omap4iss_pipeline_set_stream(pipe,
 402                                                 ISS_PIPELINE_STREAM_SINGLESHOT);
 403         }
 404 }
 405 
 406 static const struct vb2_ops iss_video_vb2ops = {
 407         .queue_setup    = iss_video_queue_setup,
 408         .buf_prepare    = iss_video_buf_prepare,
 409         .buf_queue      = iss_video_buf_queue,
 410         .buf_cleanup    = iss_video_buf_cleanup,
 411 };
 412 
 413 /*
 414  * omap4iss_video_buffer_next - Complete the current buffer and return the next
 415  * @video: ISS video object
 416  *
 417  * Remove the current video buffer from the DMA queue and fill its timestamp,
 418  * field count and state fields before waking up its completion handler.
 419  *
 420  * For capture video nodes, the buffer state is set to VB2_BUF_STATE_DONE if no
 421  * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
 422  *
 423  * The DMA queue is expected to contain at least one buffer.
 424  *
 425  * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
 426  * empty.
 427  */
 428 struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
 429 {
 430         struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
 431         enum iss_pipeline_state state;
 432         struct iss_buffer *buf;
 433         unsigned long flags;
 434 
 435         spin_lock_irqsave(&video->qlock, flags);
 436         if (WARN_ON(list_empty(&video->dmaqueue))) {
 437                 spin_unlock_irqrestore(&video->qlock, flags);
 438                 return NULL;
 439         }
 440 
 441         buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
 442                                list);
 443         list_del(&buf->list);
 444         spin_unlock_irqrestore(&video->qlock, flags);
 445 
 446         buf->vb.vb2_buf.timestamp = ktime_get_ns();
 447 
 448         /*
 449          * Do frame number propagation only if this is the output video node.
 450          * Frame number either comes from the CSI receivers or it gets
 451          * incremented here if H3A is not active.
 452          * Note: There is no guarantee that the output buffer will finish
 453          * first, so the input number might lag behind by 1 in some cases.
 454          */
 455         if (video == pipe->output && !pipe->do_propagation)
 456                 buf->vb.sequence =
 457                         atomic_inc_return(&pipe->frame_number);
 458         else
 459                 buf->vb.sequence = atomic_read(&pipe->frame_number);
 460 
 461         vb2_buffer_done(&buf->vb.vb2_buf, pipe->error ?
 462                         VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
 463         pipe->error = false;
 464 
 465         spin_lock_irqsave(&video->qlock, flags);
 466         if (list_empty(&video->dmaqueue)) {
 467                 spin_unlock_irqrestore(&video->qlock, flags);
 468                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 469                         state = ISS_PIPELINE_QUEUE_OUTPUT
 470                               | ISS_PIPELINE_STREAM;
 471                 else
 472                         state = ISS_PIPELINE_QUEUE_INPUT
 473                               | ISS_PIPELINE_STREAM;
 474 
 475                 spin_lock_irqsave(&pipe->lock, flags);
 476                 pipe->state &= ~state;
 477                 if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
 478                         video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
 479                 spin_unlock_irqrestore(&pipe->lock, flags);
 480                 return NULL;
 481         }
 482 
 483         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input) {
 484                 spin_lock(&pipe->lock);
 485                 pipe->state &= ~ISS_PIPELINE_STREAM;
 486                 spin_unlock(&pipe->lock);
 487         }
 488 
 489         buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
 490                                list);
 491         spin_unlock_irqrestore(&video->qlock, flags);
 492         buf->vb.vb2_buf.state = VB2_BUF_STATE_ACTIVE;
 493         return buf;
 494 }
 495 
 496 /*
 497  * omap4iss_video_cancel_stream - Cancel stream on a video node
 498  * @video: ISS video object
 499  *
 500  * Cancelling a stream mark all buffers on the video node as erroneous and makes
 501  * sure no new buffer can be queued.
 502  */
 503 void omap4iss_video_cancel_stream(struct iss_video *video)
 504 {
 505         unsigned long flags;
 506 
 507         spin_lock_irqsave(&video->qlock, flags);
 508 
 509         while (!list_empty(&video->dmaqueue)) {
 510                 struct iss_buffer *buf;
 511 
 512                 buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
 513                                        list);
 514                 list_del(&buf->list);
 515                 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 516         }
 517 
 518         vb2_queue_error(video->queue);
 519         video->error = true;
 520 
 521         spin_unlock_irqrestore(&video->qlock, flags);
 522 }
 523 
 524 /* -----------------------------------------------------------------------------
 525  * V4L2 ioctls
 526  */
 527 
 528 static int
 529 iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
 530 {
 531         struct iss_video *video = video_drvdata(file);
 532 
 533         strscpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
 534         strscpy(cap->card, video->video.name, sizeof(cap->card));
 535         strscpy(cap->bus_info, "media", sizeof(cap->bus_info));
 536         cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
 537                           | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT;
 538 
 539         return 0;
 540 }
 541 
 542 static int
 543 iss_video_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
 544 {
 545         struct iss_video *video = video_drvdata(file);
 546         struct v4l2_mbus_framefmt format;
 547         unsigned int index = f->index;
 548         unsigned int i;
 549         int ret;
 550 
 551         if (f->type != video->type)
 552                 return -EINVAL;
 553 
 554         ret = __iss_video_get_format(video, &format);
 555         if (ret < 0)
 556                 return ret;
 557 
 558         for (i = 0; i < ARRAY_SIZE(formats); ++i) {
 559                 const struct iss_format_info *info = &formats[i];
 560 
 561                 if (format.code != info->code)
 562                         continue;
 563 
 564                 if (index == 0) {
 565                         f->pixelformat = info->pixelformat;
 566                         return 0;
 567                 }
 568 
 569                 index--;
 570         }
 571 
 572         return -EINVAL;
 573 }
 574 
 575 static int
 576 iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
 577 {
 578         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 579         struct iss_video *video = video_drvdata(file);
 580 
 581         if (format->type != video->type)
 582                 return -EINVAL;
 583 
 584         mutex_lock(&video->mutex);
 585         *format = vfh->format;
 586         mutex_unlock(&video->mutex);
 587 
 588         return 0;
 589 }
 590 
 591 static int
 592 iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
 593 {
 594         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 595         struct iss_video *video = video_drvdata(file);
 596         struct v4l2_mbus_framefmt fmt;
 597 
 598         if (format->type != video->type)
 599                 return -EINVAL;
 600 
 601         mutex_lock(&video->mutex);
 602 
 603         /*
 604          * Fill the bytesperline and sizeimage fields by converting to media bus
 605          * format and back to pixel format.
 606          */
 607         iss_video_pix_to_mbus(&format->fmt.pix, &fmt);
 608         iss_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
 609 
 610         vfh->format = *format;
 611 
 612         mutex_unlock(&video->mutex);
 613         return 0;
 614 }
 615 
 616 static int
 617 iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
 618 {
 619         struct iss_video *video = video_drvdata(file);
 620         struct v4l2_subdev_format fmt;
 621         struct v4l2_subdev *subdev;
 622         u32 pad;
 623         int ret;
 624 
 625         if (format->type != video->type)
 626                 return -EINVAL;
 627 
 628         subdev = iss_video_remote_subdev(video, &pad);
 629         if (!subdev)
 630                 return -EINVAL;
 631 
 632         iss_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
 633 
 634         fmt.pad = pad;
 635         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 636         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
 637         if (ret)
 638                 return ret;
 639 
 640         iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
 641         return 0;
 642 }
 643 
 644 static int
 645 iss_video_get_selection(struct file *file, void *fh, struct v4l2_selection *sel)
 646 {
 647         struct iss_video *video = video_drvdata(file);
 648         struct v4l2_subdev_format format;
 649         struct v4l2_subdev *subdev;
 650         struct v4l2_subdev_selection sdsel = {
 651                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 652                 .target = sel->target,
 653         };
 654         u32 pad;
 655         int ret;
 656 
 657         switch (sel->target) {
 658         case V4L2_SEL_TGT_CROP:
 659         case V4L2_SEL_TGT_CROP_BOUNDS:
 660         case V4L2_SEL_TGT_CROP_DEFAULT:
 661                 if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 662                         return -EINVAL;
 663                 break;
 664         case V4L2_SEL_TGT_COMPOSE:
 665         case V4L2_SEL_TGT_COMPOSE_BOUNDS:
 666         case V4L2_SEL_TGT_COMPOSE_DEFAULT:
 667                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 668                         return -EINVAL;
 669                 break;
 670         default:
 671                 return -EINVAL;
 672         }
 673         subdev = iss_video_remote_subdev(video, &pad);
 674         if (subdev == NULL)
 675                 return -EINVAL;
 676 
 677         /*
 678          * Try the get selection operation first and fallback to get format if
 679          * not implemented.
 680          */
 681         sdsel.pad = pad;
 682         ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel);
 683         if (!ret)
 684                 sel->r = sdsel.r;
 685         if (ret != -ENOIOCTLCMD)
 686                 return ret;
 687 
 688         format.pad = pad;
 689         format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 690         ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
 691         if (ret < 0)
 692                 return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 693 
 694         sel->r.left = 0;
 695         sel->r.top = 0;
 696         sel->r.width = format.format.width;
 697         sel->r.height = format.format.height;
 698 
 699         return 0;
 700 }
 701 
 702 static int
 703 iss_video_set_selection(struct file *file, void *fh, struct v4l2_selection *sel)
 704 {
 705         struct iss_video *video = video_drvdata(file);
 706         struct v4l2_subdev *subdev;
 707         struct v4l2_subdev_selection sdsel = {
 708                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
 709                 .target = sel->target,
 710                 .flags = sel->flags,
 711                 .r = sel->r,
 712         };
 713         u32 pad;
 714         int ret;
 715 
 716         switch (sel->target) {
 717         case V4L2_SEL_TGT_CROP:
 718                 if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 719                         return -EINVAL;
 720                 break;
 721         case V4L2_SEL_TGT_COMPOSE:
 722                 if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
 723                         return -EINVAL;
 724                 break;
 725         default:
 726                 return -EINVAL;
 727         }
 728         subdev = iss_video_remote_subdev(video, &pad);
 729         if (subdev == NULL)
 730                 return -EINVAL;
 731 
 732         sdsel.pad = pad;
 733         mutex_lock(&video->mutex);
 734         ret = v4l2_subdev_call(subdev, pad, set_selection, NULL, &sdsel);
 735         mutex_unlock(&video->mutex);
 736         if (!ret)
 737                 sel->r = sdsel.r;
 738 
 739         return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
 740 }
 741 
 742 static int
 743 iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 744 {
 745         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 746         struct iss_video *video = video_drvdata(file);
 747 
 748         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 749             video->type != a->type)
 750                 return -EINVAL;
 751 
 752         memset(a, 0, sizeof(*a));
 753         a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
 754         a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
 755         a->parm.output.timeperframe = vfh->timeperframe;
 756 
 757         return 0;
 758 }
 759 
 760 static int
 761 iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
 762 {
 763         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 764         struct iss_video *video = video_drvdata(file);
 765 
 766         if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
 767             video->type != a->type)
 768                 return -EINVAL;
 769 
 770         if (a->parm.output.timeperframe.denominator == 0)
 771                 a->parm.output.timeperframe.denominator = 1;
 772 
 773         vfh->timeperframe = a->parm.output.timeperframe;
 774 
 775         return 0;
 776 }
 777 
 778 static int
 779 iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
 780 {
 781         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 782 
 783         return vb2_reqbufs(&vfh->queue, rb);
 784 }
 785 
 786 static int
 787 iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
 788 {
 789         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 790 
 791         return vb2_querybuf(&vfh->queue, b);
 792 }
 793 
 794 static int
 795 iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 796 {
 797         struct iss_video *video = video_drvdata(file);
 798         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 799 
 800         return vb2_qbuf(&vfh->queue, video->video.v4l2_dev->mdev, b);
 801 }
 802 
 803 static int
 804 iss_video_expbuf(struct file *file, void *fh, struct v4l2_exportbuffer *e)
 805 {
 806         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 807 
 808         return vb2_expbuf(&vfh->queue, e);
 809 }
 810 
 811 static int
 812 iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
 813 {
 814         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 815 
 816         return vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
 817 }
 818 
 819 /*
 820  * Stream management
 821  *
 822  * Every ISS pipeline has a single input and a single output. The input can be
 823  * either a sensor or a video node. The output is always a video node.
 824  *
 825  * As every pipeline has an output video node, the ISS video objects at the
 826  * pipeline output stores the pipeline state. It tracks the streaming state of
 827  * both the input and output, as well as the availability of buffers.
 828  *
 829  * In sensor-to-memory mode, frames are always available at the pipeline input.
 830  * Starting the sensor usually requires I2C transfers and must be done in
 831  * interruptible context. The pipeline is started and stopped synchronously
 832  * to the stream on/off commands. All modules in the pipeline will get their
 833  * subdev set stream handler called. The module at the end of the pipeline must
 834  * delay starting the hardware until buffers are available at its output.
 835  *
 836  * In memory-to-memory mode, starting/stopping the stream requires
 837  * synchronization between the input and output. ISS modules can't be stopped
 838  * in the middle of a frame, and at least some of the modules seem to become
 839  * busy as soon as they're started, even if they don't receive a frame start
 840  * event. For that reason frames need to be processed in single-shot mode. The
 841  * driver needs to wait until a frame is completely processed and written to
 842  * memory before restarting the pipeline for the next frame. Pipelined
 843  * processing might be possible but requires more testing.
 844  *
 845  * Stream start must be delayed until buffers are available at both the input
 846  * and output. The pipeline must be started in the videobuf queue callback with
 847  * the buffers queue spinlock held. The modules subdev set stream operation must
 848  * not sleep.
 849  */
 850 static int
 851 iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
 852 {
 853         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 854         struct iss_video *video = video_drvdata(file);
 855         struct media_graph graph;
 856         struct media_entity *entity = &video->video.entity;
 857         enum iss_pipeline_state state;
 858         struct iss_pipeline *pipe;
 859         struct iss_video *far_end;
 860         unsigned long flags;
 861         int ret;
 862 
 863         if (type != video->type)
 864                 return -EINVAL;
 865 
 866         mutex_lock(&video->stream_lock);
 867 
 868         /*
 869          * Start streaming on the pipeline. No link touching an entity in the
 870          * pipeline can be activated or deactivated once streaming is started.
 871          */
 872         pipe = entity->pipe
 873              ? to_iss_pipeline(entity) : &video->pipe;
 874         pipe->external = NULL;
 875         pipe->external_rate = 0;
 876         pipe->external_bpp = 0;
 877 
 878         ret = media_entity_enum_init(&pipe->ent_enum, entity->graph_obj.mdev);
 879         if (ret)
 880                 goto err_graph_walk_init;
 881 
 882         ret = media_graph_walk_init(&graph, entity->graph_obj.mdev);
 883         if (ret)
 884                 goto err_graph_walk_init;
 885 
 886         if (video->iss->pdata->set_constraints)
 887                 video->iss->pdata->set_constraints(video->iss, true);
 888 
 889         ret = media_pipeline_start(entity, &pipe->pipe);
 890         if (ret < 0)
 891                 goto err_media_pipeline_start;
 892 
 893         media_graph_walk_start(&graph, entity);
 894         while ((entity = media_graph_walk_next(&graph)))
 895                 media_entity_enum_set(&pipe->ent_enum, entity);
 896 
 897         /*
 898          * Verify that the currently configured format matches the output of
 899          * the connected subdev.
 900          */
 901         ret = iss_video_check_format(video, vfh);
 902         if (ret < 0)
 903                 goto err_iss_video_check_format;
 904 
 905         video->bpl_padding = ret;
 906         video->bpl_value = vfh->format.fmt.pix.bytesperline;
 907 
 908         /*
 909          * Find the ISS video node connected at the far end of the pipeline and
 910          * update the pipeline.
 911          */
 912         far_end = iss_video_far_end(video);
 913 
 914         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
 915                 state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
 916                 pipe->input = far_end;
 917                 pipe->output = video;
 918         } else {
 919                 if (!far_end) {
 920                         ret = -EPIPE;
 921                         goto err_iss_video_check_format;
 922                 }
 923 
 924                 state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
 925                 pipe->input = video;
 926                 pipe->output = far_end;
 927         }
 928 
 929         spin_lock_irqsave(&pipe->lock, flags);
 930         pipe->state &= ~ISS_PIPELINE_STREAM;
 931         pipe->state |= state;
 932         spin_unlock_irqrestore(&pipe->lock, flags);
 933 
 934         /*
 935          * Set the maximum time per frame as the value requested by userspace.
 936          * This is a soft limit that can be overridden if the hardware doesn't
 937          * support the request limit.
 938          */
 939         if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
 940                 pipe->max_timeperframe = vfh->timeperframe;
 941 
 942         video->queue = &vfh->queue;
 943         INIT_LIST_HEAD(&video->dmaqueue);
 944         video->error = false;
 945         atomic_set(&pipe->frame_number, -1);
 946 
 947         ret = vb2_streamon(&vfh->queue, type);
 948         if (ret < 0)
 949                 goto err_iss_video_check_format;
 950 
 951         /*
 952          * In sensor-to-memory mode, the stream can be started synchronously
 953          * to the stream on command. In memory-to-memory mode, it will be
 954          * started when buffers are queued on both the input and output.
 955          */
 956         if (!pipe->input) {
 957                 unsigned long flags;
 958 
 959                 ret = omap4iss_pipeline_set_stream(pipe,
 960                                               ISS_PIPELINE_STREAM_CONTINUOUS);
 961                 if (ret < 0)
 962                         goto err_omap4iss_set_stream;
 963                 spin_lock_irqsave(&video->qlock, flags);
 964                 if (list_empty(&video->dmaqueue))
 965                         video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
 966                 spin_unlock_irqrestore(&video->qlock, flags);
 967         }
 968 
 969         media_graph_walk_cleanup(&graph);
 970 
 971         mutex_unlock(&video->stream_lock);
 972 
 973         return 0;
 974 
 975 err_omap4iss_set_stream:
 976         vb2_streamoff(&vfh->queue, type);
 977 err_iss_video_check_format:
 978         media_pipeline_stop(&video->video.entity);
 979 err_media_pipeline_start:
 980         if (video->iss->pdata->set_constraints)
 981                 video->iss->pdata->set_constraints(video->iss, false);
 982         video->queue = NULL;
 983 
 984         media_graph_walk_cleanup(&graph);
 985 
 986 err_graph_walk_init:
 987         media_entity_enum_cleanup(&pipe->ent_enum);
 988 
 989         mutex_unlock(&video->stream_lock);
 990 
 991         return ret;
 992 }
 993 
 994 static int
 995 iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
 996 {
 997         struct iss_video_fh *vfh = to_iss_video_fh(fh);
 998         struct iss_video *video = video_drvdata(file);
 999         struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
1000         enum iss_pipeline_state state;
1001         unsigned long flags;
1002 
1003         if (type != video->type)
1004                 return -EINVAL;
1005 
1006         mutex_lock(&video->stream_lock);
1007 
1008         if (!vb2_is_streaming(&vfh->queue))
1009                 goto done;
1010 
1011         /* Update the pipeline state. */
1012         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1013                 state = ISS_PIPELINE_STREAM_OUTPUT
1014                       | ISS_PIPELINE_QUEUE_OUTPUT;
1015         else
1016                 state = ISS_PIPELINE_STREAM_INPUT
1017                       | ISS_PIPELINE_QUEUE_INPUT;
1018 
1019         spin_lock_irqsave(&pipe->lock, flags);
1020         pipe->state &= ~state;
1021         spin_unlock_irqrestore(&pipe->lock, flags);
1022 
1023         /* Stop the stream. */
1024         omap4iss_pipeline_set_stream(pipe, ISS_PIPELINE_STREAM_STOPPED);
1025         vb2_streamoff(&vfh->queue, type);
1026         video->queue = NULL;
1027 
1028         media_entity_enum_cleanup(&pipe->ent_enum);
1029 
1030         if (video->iss->pdata->set_constraints)
1031                 video->iss->pdata->set_constraints(video->iss, false);
1032         media_pipeline_stop(&video->video.entity);
1033 
1034 done:
1035         mutex_unlock(&video->stream_lock);
1036         return 0;
1037 }
1038 
1039 static int
1040 iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
1041 {
1042         if (input->index > 0)
1043                 return -EINVAL;
1044 
1045         strscpy(input->name, "camera", sizeof(input->name));
1046         input->type = V4L2_INPUT_TYPE_CAMERA;
1047 
1048         return 0;
1049 }
1050 
1051 static int
1052 iss_video_g_input(struct file *file, void *fh, unsigned int *input)
1053 {
1054         *input = 0;
1055 
1056         return 0;
1057 }
1058 
1059 static int
1060 iss_video_s_input(struct file *file, void *fh, unsigned int input)
1061 {
1062         return input == 0 ? 0 : -EINVAL;
1063 }
1064 
1065 static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
1066         .vidioc_querycap                = iss_video_querycap,
1067         .vidioc_enum_fmt_vid_cap        = iss_video_enum_format,
1068         .vidioc_g_fmt_vid_cap           = iss_video_get_format,
1069         .vidioc_s_fmt_vid_cap           = iss_video_set_format,
1070         .vidioc_try_fmt_vid_cap         = iss_video_try_format,
1071         .vidioc_g_fmt_vid_out           = iss_video_get_format,
1072         .vidioc_s_fmt_vid_out           = iss_video_set_format,
1073         .vidioc_try_fmt_vid_out         = iss_video_try_format,
1074         .vidioc_g_selection             = iss_video_get_selection,
1075         .vidioc_s_selection             = iss_video_set_selection,
1076         .vidioc_g_parm                  = iss_video_get_param,
1077         .vidioc_s_parm                  = iss_video_set_param,
1078         .vidioc_reqbufs                 = iss_video_reqbufs,
1079         .vidioc_querybuf                = iss_video_querybuf,
1080         .vidioc_qbuf                    = iss_video_qbuf,
1081         .vidioc_expbuf                  = iss_video_expbuf,
1082         .vidioc_dqbuf                   = iss_video_dqbuf,
1083         .vidioc_streamon                = iss_video_streamon,
1084         .vidioc_streamoff               = iss_video_streamoff,
1085         .vidioc_enum_input              = iss_video_enum_input,
1086         .vidioc_g_input                 = iss_video_g_input,
1087         .vidioc_s_input                 = iss_video_s_input,
1088 };
1089 
1090 /* -----------------------------------------------------------------------------
1091  * V4L2 file operations
1092  */
1093 
1094 static int iss_video_open(struct file *file)
1095 {
1096         struct iss_video *video = video_drvdata(file);
1097         struct iss_video_fh *handle;
1098         struct vb2_queue *q;
1099         int ret = 0;
1100 
1101         handle = kzalloc(sizeof(*handle), GFP_KERNEL);
1102         if (!handle)
1103                 return -ENOMEM;
1104 
1105         v4l2_fh_init(&handle->vfh, &video->video);
1106         v4l2_fh_add(&handle->vfh);
1107 
1108         /* If this is the first user, initialise the pipeline. */
1109         if (!omap4iss_get(video->iss)) {
1110                 ret = -EBUSY;
1111                 goto done;
1112         }
1113 
1114         ret = v4l2_pipeline_pm_use(&video->video.entity, 1);
1115         if (ret < 0) {
1116                 omap4iss_put(video->iss);
1117                 goto done;
1118         }
1119 
1120         q = &handle->queue;
1121 
1122         q->type = video->type;
1123         q->io_modes = VB2_MMAP | VB2_DMABUF;
1124         q->drv_priv = handle;
1125         q->ops = &iss_video_vb2ops;
1126         q->mem_ops = &vb2_dma_contig_memops;
1127         q->buf_struct_size = sizeof(struct iss_buffer);
1128         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1129         q->dev = video->iss->dev;
1130 
1131         ret = vb2_queue_init(q);
1132         if (ret) {
1133                 omap4iss_put(video->iss);
1134                 goto done;
1135         }
1136 
1137         memset(&handle->format, 0, sizeof(handle->format));
1138         handle->format.type = video->type;
1139         handle->timeperframe.denominator = 1;
1140 
1141         handle->video = video;
1142         file->private_data = &handle->vfh;
1143 
1144 done:
1145         if (ret < 0) {
1146                 v4l2_fh_del(&handle->vfh);
1147                 v4l2_fh_exit(&handle->vfh);
1148                 kfree(handle);
1149         }
1150 
1151         return ret;
1152 }
1153 
1154 static int iss_video_release(struct file *file)
1155 {
1156         struct iss_video *video = video_drvdata(file);
1157         struct v4l2_fh *vfh = file->private_data;
1158         struct iss_video_fh *handle = to_iss_video_fh(vfh);
1159 
1160         /* Disable streaming and free the buffers queue resources. */
1161         iss_video_streamoff(file, vfh, video->type);
1162 
1163         v4l2_pipeline_pm_use(&video->video.entity, 0);
1164 
1165         /* Release the videobuf2 queue */
1166         vb2_queue_release(&handle->queue);
1167 
1168         v4l2_fh_del(vfh);
1169         v4l2_fh_exit(vfh);
1170         kfree(handle);
1171         file->private_data = NULL;
1172 
1173         omap4iss_put(video->iss);
1174 
1175         return 0;
1176 }
1177 
1178 static __poll_t iss_video_poll(struct file *file, poll_table *wait)
1179 {
1180         struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1181 
1182         return vb2_poll(&vfh->queue, file, wait);
1183 }
1184 
1185 static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
1186 {
1187         struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
1188 
1189         return vb2_mmap(&vfh->queue, vma);
1190 }
1191 
1192 static const struct v4l2_file_operations iss_video_fops = {
1193         .owner = THIS_MODULE,
1194         .unlocked_ioctl = video_ioctl2,
1195         .open = iss_video_open,
1196         .release = iss_video_release,
1197         .poll = iss_video_poll,
1198         .mmap = iss_video_mmap,
1199 };
1200 
1201 /* -----------------------------------------------------------------------------
1202  * ISS video core
1203  */
1204 
1205 static const struct iss_video_operations iss_video_dummy_ops = {
1206 };
1207 
1208 int omap4iss_video_init(struct iss_video *video, const char *name)
1209 {
1210         const char *direction;
1211         int ret;
1212 
1213         switch (video->type) {
1214         case V4L2_BUF_TYPE_VIDEO_CAPTURE:
1215                 direction = "output";
1216                 video->pad.flags = MEDIA_PAD_FL_SINK;
1217                 break;
1218         case V4L2_BUF_TYPE_VIDEO_OUTPUT:
1219                 direction = "input";
1220                 video->pad.flags = MEDIA_PAD_FL_SOURCE;
1221                 break;
1222 
1223         default:
1224                 return -EINVAL;
1225         }
1226 
1227         ret = media_entity_pads_init(&video->video.entity, 1, &video->pad);
1228         if (ret < 0)
1229                 return ret;
1230 
1231         spin_lock_init(&video->qlock);
1232         mutex_init(&video->mutex);
1233         atomic_set(&video->active, 0);
1234 
1235         spin_lock_init(&video->pipe.lock);
1236         mutex_init(&video->stream_lock);
1237 
1238         /* Initialize the video device. */
1239         if (!video->ops)
1240                 video->ops = &iss_video_dummy_ops;
1241 
1242         video->video.fops = &iss_video_fops;
1243         snprintf(video->video.name, sizeof(video->video.name),
1244                  "OMAP4 ISS %s %s", name, direction);
1245         video->video.vfl_type = VFL_TYPE_GRABBER;
1246         video->video.release = video_device_release_empty;
1247         video->video.ioctl_ops = &iss_video_ioctl_ops;
1248         video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
1249 
1250         video_set_drvdata(&video->video, video);
1251 
1252         return 0;
1253 }
1254 
1255 void omap4iss_video_cleanup(struct iss_video *video)
1256 {
1257         media_entity_cleanup(&video->video.entity);
1258         mutex_destroy(&video->stream_lock);
1259         mutex_destroy(&video->mutex);
1260 }
1261 
1262 int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
1263 {
1264         int ret;
1265 
1266         video->video.v4l2_dev = vdev;
1267         if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
1268                 video->video.device_caps = V4L2_CAP_VIDEO_CAPTURE;
1269         else
1270                 video->video.device_caps = V4L2_CAP_VIDEO_OUTPUT;
1271         video->video.device_caps |= V4L2_CAP_STREAMING;
1272 
1273         ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
1274         if (ret < 0)
1275                 dev_err(video->iss->dev,
1276                         "could not register video device (%d)\n", ret);
1277 
1278         return ret;
1279 }
1280 
1281 void omap4iss_video_unregister(struct iss_video *video)
1282 {
1283         video_unregister_device(&video->video);
1284 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/staging/media/omap4iss/iss_video.c

DEFINITIONS
