--- /dev/null
+/*
+ * TI OMAP4 ISS V4L2 Driver - Generic video node
+ *
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ *
+ * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <asm/cacheflush.h>
+#include <linux/clk.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <media/v4l2-dev.h>
+#include <media/v4l2-ioctl.h>
+
+#include "iss_video.h"
+#include "iss.h"
+
+
+/* -----------------------------------------------------------------------------
+ * Helper functions
+ */
+
+static struct iss_format_info formats[] = {
+ { MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
+ MEDIA_BUS_FMT_Y8_1X8, MEDIA_BUS_FMT_Y8_1X8,
+ V4L2_PIX_FMT_GREY, 8, "Greyscale 8 bpp", },
+ { MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y10_1X10,
+ MEDIA_BUS_FMT_Y10_1X10, MEDIA_BUS_FMT_Y8_1X8,
+ V4L2_PIX_FMT_Y10, 10, "Greyscale 10 bpp", },
+ { MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y10_1X10,
+ MEDIA_BUS_FMT_Y12_1X12, MEDIA_BUS_FMT_Y8_1X8,
+ V4L2_PIX_FMT_Y12, 12, "Greyscale 12 bpp", },
+ { MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
+ MEDIA_BUS_FMT_SBGGR8_1X8, MEDIA_BUS_FMT_SBGGR8_1X8,
+ V4L2_PIX_FMT_SBGGR8, 8, "BGGR Bayer 8 bpp", },
+ { MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
+ MEDIA_BUS_FMT_SGBRG8_1X8, MEDIA_BUS_FMT_SGBRG8_1X8,
+ V4L2_PIX_FMT_SGBRG8, 8, "GBRG Bayer 8 bpp", },
+ { MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
+ MEDIA_BUS_FMT_SGRBG8_1X8, MEDIA_BUS_FMT_SGRBG8_1X8,
+ V4L2_PIX_FMT_SGRBG8, 8, "GRBG Bayer 8 bpp", },
+ { MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
+ MEDIA_BUS_FMT_SRGGB8_1X8, MEDIA_BUS_FMT_SRGGB8_1X8,
+ V4L2_PIX_FMT_SRGGB8, 8, "RGGB Bayer 8 bpp", },
+ { MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8,
+ MEDIA_BUS_FMT_SGRBG10_1X10, 0,
+ V4L2_PIX_FMT_SGRBG10DPCM8, 8, "GRBG Bayer 10 bpp DPCM8", },
+ { MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR10_1X10,
+ MEDIA_BUS_FMT_SBGGR10_1X10, MEDIA_BUS_FMT_SBGGR8_1X8,
+ V4L2_PIX_FMT_SBGGR10, 10, "BGGR Bayer 10 bpp", },
+ { MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG10_1X10,
+ MEDIA_BUS_FMT_SGBRG10_1X10, MEDIA_BUS_FMT_SGBRG8_1X8,
+ V4L2_PIX_FMT_SGBRG10, 10, "GBRG Bayer 10 bpp", },
+ { MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG10_1X10,
+ MEDIA_BUS_FMT_SGRBG10_1X10, MEDIA_BUS_FMT_SGRBG8_1X8,
+ V4L2_PIX_FMT_SGRBG10, 10, "GRBG Bayer 10 bpp", },
+ { MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB10_1X10,
+ MEDIA_BUS_FMT_SRGGB10_1X10, MEDIA_BUS_FMT_SRGGB8_1X8,
+ V4L2_PIX_FMT_SRGGB10, 10, "RGGB Bayer 10 bpp", },
+ { MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR10_1X10,
+ MEDIA_BUS_FMT_SBGGR12_1X12, MEDIA_BUS_FMT_SBGGR8_1X8,
+ V4L2_PIX_FMT_SBGGR12, 12, "BGGR Bayer 12 bpp", },
+ { MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG10_1X10,
+ MEDIA_BUS_FMT_SGBRG12_1X12, MEDIA_BUS_FMT_SGBRG8_1X8,
+ V4L2_PIX_FMT_SGBRG12, 12, "GBRG Bayer 12 bpp", },
+ { MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG10_1X10,
+ MEDIA_BUS_FMT_SGRBG12_1X12, MEDIA_BUS_FMT_SGRBG8_1X8,
+ V4L2_PIX_FMT_SGRBG12, 12, "GRBG Bayer 12 bpp", },
+ { MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB10_1X10,
+ MEDIA_BUS_FMT_SRGGB12_1X12, MEDIA_BUS_FMT_SRGGB8_1X8,
+ V4L2_PIX_FMT_SRGGB12, 12, "RGGB Bayer 12 bpp", },
+ { MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16,
+ MEDIA_BUS_FMT_UYVY8_1X16, 0,
+ V4L2_PIX_FMT_UYVY, 16, "YUV 4:2:2 (UYVY)", },
+ { MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16,
+ MEDIA_BUS_FMT_YUYV8_1X16, 0,
+ V4L2_PIX_FMT_YUYV, 16, "YUV 4:2:2 (YUYV)", },
+ { MEDIA_BUS_FMT_YUYV8_1_5X8, MEDIA_BUS_FMT_YUYV8_1_5X8,
+ MEDIA_BUS_FMT_YUYV8_1_5X8, 0,
+ V4L2_PIX_FMT_NV12, 8, "YUV 4:2:0 (NV12)", },
+};
+
+const struct iss_format_info *
+omap4iss_video_format_info(u32 code)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(formats); ++i) {
+ if (formats[i].code == code)
+ return &formats[i];
+ }
+
+ return NULL;
+}
+
+/*
+ * iss_video_mbus_to_pix - Convert v4l2_mbus_framefmt to v4l2_pix_format
+ * @video: ISS video instance
+ * @mbus: v4l2_mbus_framefmt format (input)
+ * @pix: v4l2_pix_format format (output)
+ *
+ * Fill the output pix structure with information from the input mbus format.
+ * The bytesperline and sizeimage fields are computed from the requested bytes
+ * per line value in the pix format and information from the video instance.
+ *
+ * Return the number of padding bytes at end of line.
+ */
+static unsigned int iss_video_mbus_to_pix(const struct iss_video *video,
+ const struct v4l2_mbus_framefmt *mbus,
+ struct v4l2_pix_format *pix)
+{
+ unsigned int bpl = pix->bytesperline;
+ unsigned int min_bpl;
+ unsigned int i;
+
+ memset(pix, 0, sizeof(*pix));
+ pix->width = mbus->width;
+ pix->height = mbus->height;
+
+ /* Skip the last format in the loop so that it will be selected if no
+ * match is found.
+ */
+ for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
+ if (formats[i].code == mbus->code)
+ break;
+ }
+
+ min_bpl = pix->width * ALIGN(formats[i].bpp, 8) / 8;
+
+ /* Clamp the requested bytes per line value. If the maximum bytes per
+ * line value is zero, the module doesn't support user configurable line
+ * sizes. Override the requested value with the minimum in that case.
+ */
+ if (video->bpl_max)
+ bpl = clamp(bpl, min_bpl, video->bpl_max);
+ else
+ bpl = min_bpl;
+
+ if (!video->bpl_zero_padding || bpl != min_bpl)
+ bpl = ALIGN(bpl, video->bpl_alignment);
+
+ pix->pixelformat = formats[i].pixelformat;
+ pix->bytesperline = bpl;
+ pix->sizeimage = pix->bytesperline * pix->height;
+ pix->colorspace = mbus->colorspace;
+ pix->field = mbus->field;
+
+ /* FIXME: Special case for NV12! We should make this nicer... */
+ if (pix->pixelformat == V4L2_PIX_FMT_NV12)
+ pix->sizeimage += (pix->bytesperline * pix->height) / 2;
+
+ return bpl - min_bpl;
+}
+
+static void iss_video_pix_to_mbus(const struct v4l2_pix_format *pix,
+ struct v4l2_mbus_framefmt *mbus)
+{
+ unsigned int i;
+
+ memset(mbus, 0, sizeof(*mbus));
+ mbus->width = pix->width;
+ mbus->height = pix->height;
+
+ /* Skip the last format in the loop so that it will be selected if no
+ * match is found.
+ */
+ for (i = 0; i < ARRAY_SIZE(formats) - 1; ++i) {
+ if (formats[i].pixelformat == pix->pixelformat)
+ break;
+ }
+
+ mbus->code = formats[i].code;
+ mbus->colorspace = pix->colorspace;
+ mbus->field = pix->field;
+}
+
+static struct v4l2_subdev *
+iss_video_remote_subdev(struct iss_video *video, u32 *pad)
+{
+ struct media_pad *remote;
+
+ remote = media_entity_remote_pad(&video->pad);
+
+ if (remote == NULL ||
+ media_entity_type(remote->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
+ return NULL;
+
+ if (pad)
+ *pad = remote->index;
+
+ return media_entity_to_v4l2_subdev(remote->entity);
+}
+
+/* Return a pointer to the ISS video instance at the far end of the pipeline. */
+static struct iss_video *
+iss_video_far_end(struct iss_video *video)
+{
+ struct media_entity_graph graph;
+ struct media_entity *entity = &video->video.entity;
+ struct media_device *mdev = entity->parent;
+ struct iss_video *far_end = NULL;
+
+ mutex_lock(&mdev->graph_mutex);
+ media_entity_graph_walk_start(&graph, entity);
+
+ while ((entity = media_entity_graph_walk_next(&graph))) {
+ if (entity == &video->video.entity)
+ continue;
+
+ if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
+ continue;
+
+ far_end = to_iss_video(media_entity_to_video_device(entity));
+ if (far_end->type != video->type)
+ break;
+
+ far_end = NULL;
+ }
+
+ mutex_unlock(&mdev->graph_mutex);
+ return far_end;
+}
+
+static int
+__iss_video_get_format(struct iss_video *video,
+ struct v4l2_mbus_framefmt *format)
+{
+ struct v4l2_subdev_format fmt;
+ struct v4l2_subdev *subdev;
+ u32 pad;
+ int ret;
+
+ subdev = iss_video_remote_subdev(video, &pad);
+ if (subdev == NULL)
+ return -EINVAL;
+
+ memset(&fmt, 0, sizeof(fmt));
+ fmt.pad = pad;
+ fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+
+ mutex_lock(&video->mutex);
+ ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
+ mutex_unlock(&video->mutex);
+
+ if (ret)
+ return ret;
+
+ *format = fmt.format;
+ return 0;
+}
+
+static int
+iss_video_check_format(struct iss_video *video, struct iss_video_fh *vfh)
+{
+ struct v4l2_mbus_framefmt format;
+ struct v4l2_pix_format pixfmt;
+ int ret;
+
+ ret = __iss_video_get_format(video, &format);
+ if (ret < 0)
+ return ret;
+
+ pixfmt.bytesperline = 0;
+ ret = iss_video_mbus_to_pix(video, &format, &pixfmt);
+
+ if (vfh->format.fmt.pix.pixelformat != pixfmt.pixelformat ||
+ vfh->format.fmt.pix.height != pixfmt.height ||
+ vfh->format.fmt.pix.width != pixfmt.width ||
+ vfh->format.fmt.pix.bytesperline != pixfmt.bytesperline ||
+ vfh->format.fmt.pix.sizeimage != pixfmt.sizeimage)
+ return -EINVAL;
+
+ return ret;
+}
+
+/* -----------------------------------------------------------------------------
+ * Video queue operations
+ */
+
+static int iss_video_queue_setup(struct vb2_queue *vq,
+ const struct v4l2_format *fmt,
+ unsigned int *count, unsigned int *num_planes,
+ unsigned int sizes[], void *alloc_ctxs[])
+{
+ struct iss_video_fh *vfh = vb2_get_drv_priv(vq);
+ struct iss_video *video = vfh->video;
+
+ /* Revisit multi-planar support for NV12 */
+ *num_planes = 1;
+
+ sizes[0] = vfh->format.fmt.pix.sizeimage;
+ if (sizes[0] == 0)
+ return -EINVAL;
+
+ alloc_ctxs[0] = video->alloc_ctx;
+
+ *count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0]));
+
+ return 0;
+}
+
+static void iss_video_buf_cleanup(struct vb2_buffer *vb)
+{
+ struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
+
+ if (buffer->iss_addr)
+ buffer->iss_addr = 0;
+}
+
+static int iss_video_buf_prepare(struct vb2_buffer *vb)
+{
+ struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
+ struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
+ struct iss_video *video = vfh->video;
+ unsigned long size = vfh->format.fmt.pix.sizeimage;
+ dma_addr_t addr;
+
+ if (vb2_plane_size(vb, 0) < size)
+ return -ENOBUFS;
+
+ addr = vb2_dma_contig_plane_dma_addr(vb, 0);
+ if (!IS_ALIGNED(addr, 32)) {
+ dev_dbg(video->iss->dev,
+ "Buffer address must be aligned to 32 bytes boundary.\n");
+ return -EINVAL;
+ }
+
+ vb2_set_plane_payload(vb, 0, size);
+ buffer->iss_addr = addr;
+ return 0;
+}
+
+static void iss_video_buf_queue(struct vb2_buffer *vb)
+{
+ struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue);
+ struct iss_video *video = vfh->video;
+ struct iss_buffer *buffer = container_of(vb, struct iss_buffer, vb);
+ struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
+ unsigned long flags;
+ bool empty;
+
+ spin_lock_irqsave(&video->qlock, flags);
+
+ /* Mark the buffer is faulty and give it back to the queue immediately
+ * if the video node has registered an error. vb2 will perform the same
+ * check when preparing the buffer, but that is inherently racy, so we
+ * need to handle the race condition with an authoritative check here.
+ */
+ if (unlikely(video->error)) {
+ vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
+ spin_unlock_irqrestore(&video->qlock, flags);
+ return;
+ }
+
+ empty = list_empty(&video->dmaqueue);
+ list_add_tail(&buffer->list, &video->dmaqueue);
+
+ spin_unlock_irqrestore(&video->qlock, flags);
+
+ if (empty) {
+ enum iss_pipeline_state state;
+ unsigned int start;
+
+ if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ state = ISS_PIPELINE_QUEUE_OUTPUT;
+ else
+ state = ISS_PIPELINE_QUEUE_INPUT;
+
+ spin_lock_irqsave(&pipe->lock, flags);
+ pipe->state |= state;
+ video->ops->queue(video, buffer);
+ video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_QUEUED;
+
+ start = iss_pipeline_ready(pipe);
+ if (start)
+ pipe->state |= ISS_PIPELINE_STREAM;
+ spin_unlock_irqrestore(&pipe->lock, flags);
+
+ if (start)
+ omap4iss_pipeline_set_stream(pipe,
+ ISS_PIPELINE_STREAM_SINGLESHOT);
+ }
+}
+
+static const struct vb2_ops iss_video_vb2ops = {
+ .queue_setup = iss_video_queue_setup,
+ .buf_prepare = iss_video_buf_prepare,
+ .buf_queue = iss_video_buf_queue,
+ .buf_cleanup = iss_video_buf_cleanup,
+};
+
+/*
+ * omap4iss_video_buffer_next - Complete the current buffer and return the next
+ * @video: ISS video object
+ *
+ * Remove the current video buffer from the DMA queue and fill its timestamp,
+ * field count and state fields before waking up its completion handler.
+ *
+ * For capture video nodes, the buffer state is set to VB2_BUF_STATE_DONE if no
+ * error has been flagged in the pipeline, or to VB2_BUF_STATE_ERROR otherwise.
+ *
+ * The DMA queue is expected to contain at least one buffer.
+ *
+ * Return a pointer to the next buffer in the DMA queue, or NULL if the queue is
+ * empty.
+ */
+struct iss_buffer *omap4iss_video_buffer_next(struct iss_video *video)
+{
+ struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
+ enum iss_pipeline_state state;
+ struct iss_buffer *buf;
+ unsigned long flags;
+ struct timespec ts;
+
+ spin_lock_irqsave(&video->qlock, flags);
+ if (WARN_ON(list_empty(&video->dmaqueue))) {
+ spin_unlock_irqrestore(&video->qlock, flags);
+ return NULL;
+ }
+
+ buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
+ list);
+ list_del(&buf->list);
+ spin_unlock_irqrestore(&video->qlock, flags);
+
+ ktime_get_ts(&ts);
+ buf->vb.v4l2_buf.timestamp.tv_sec = ts.tv_sec;
+ buf->vb.v4l2_buf.timestamp.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
+
+ /* Do frame number propagation only if this is the output video node.
+ * Frame number either comes from the CSI receivers or it gets
+ * incremented here if H3A is not active.
+ * Note: There is no guarantee that the output buffer will finish
+ * first, so the input number might lag behind by 1 in some cases.
+ */
+ if (video == pipe->output && !pipe->do_propagation)
+ buf->vb.v4l2_buf.sequence =
+ atomic_inc_return(&pipe->frame_number);
+ else
+ buf->vb.v4l2_buf.sequence = atomic_read(&pipe->frame_number);
+
+ vb2_buffer_done(&buf->vb, pipe->error ?
+ VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
+ pipe->error = false;
+
+ spin_lock_irqsave(&video->qlock, flags);
+ if (list_empty(&video->dmaqueue)) {
+ spin_unlock_irqrestore(&video->qlock, flags);
+ if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ state = ISS_PIPELINE_QUEUE_OUTPUT
+ | ISS_PIPELINE_STREAM;
+ else
+ state = ISS_PIPELINE_QUEUE_INPUT
+ | ISS_PIPELINE_STREAM;
+
+ spin_lock_irqsave(&pipe->lock, flags);
+ pipe->state &= ~state;
+ if (video->pipe.stream_state == ISS_PIPELINE_STREAM_CONTINUOUS)
+ video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
+ spin_unlock_irqrestore(&pipe->lock, flags);
+ return NULL;
+ }
+
+ if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE && pipe->input != NULL) {
+ spin_lock(&pipe->lock);
+ pipe->state &= ~ISS_PIPELINE_STREAM;
+ spin_unlock(&pipe->lock);
+ }
+
+ buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
+ list);
+ spin_unlock_irqrestore(&video->qlock, flags);
+ buf->vb.state = VB2_BUF_STATE_ACTIVE;
+ return buf;
+}
+
+/*
+ * omap4iss_video_cancel_stream - Cancel stream on a video node
+ * @video: ISS video object
+ *
+ * Cancelling a stream mark all buffers on the video node as erroneous and makes
+ * sure no new buffer can be queued.
+ */
+void omap4iss_video_cancel_stream(struct iss_video *video)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&video->qlock, flags);
+
+ while (!list_empty(&video->dmaqueue)) {
+ struct iss_buffer *buf;
+
+ buf = list_first_entry(&video->dmaqueue, struct iss_buffer,
+ list);
+ list_del(&buf->list);
+ vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
+ }
+
+ vb2_queue_error(video->queue);
+ video->error = true;
+
+ spin_unlock_irqrestore(&video->qlock, flags);
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 ioctls
+ */
+
+static int
+iss_video_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
+{
+ struct iss_video *video = video_drvdata(file);
+
+ strlcpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver));
+ strlcpy(cap->card, video->video.name, sizeof(cap->card));
+ strlcpy(cap->bus_info, "media", sizeof(cap->bus_info));
+
+ if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
+ else
+ cap->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
+
+ cap->capabilities = V4L2_CAP_DEVICE_CAPS | V4L2_CAP_STREAMING
+ | V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_VIDEO_OUTPUT;
+
+ return 0;
+}
+
+static int
+iss_video_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
+{
+ struct iss_video *video = video_drvdata(file);
+ struct v4l2_mbus_framefmt format;
+ unsigned int index = f->index;
+ unsigned int i;
+ int ret;
+
+ if (f->type != video->type)
+ return -EINVAL;
+
+ ret = __iss_video_get_format(video, &format);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(formats); ++i) {
+ const struct iss_format_info *info = &formats[i];
+
+ if (format.code != info->code)
+ continue;
+
+ if (index == 0) {
+ f->pixelformat = info->pixelformat;
+ strlcpy(f->description, info->description,
+ sizeof(f->description));
+ return 0;
+ }
+
+ index--;
+ }
+
+ return -EINVAL;
+}
+
+static int
+iss_video_get_format(struct file *file, void *fh, struct v4l2_format *format)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+ struct iss_video *video = video_drvdata(file);
+
+ if (format->type != video->type)
+ return -EINVAL;
+
+ mutex_lock(&video->mutex);
+ *format = vfh->format;
+ mutex_unlock(&video->mutex);
+
+ return 0;
+}
+
+static int
+iss_video_set_format(struct file *file, void *fh, struct v4l2_format *format)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+ struct iss_video *video = video_drvdata(file);
+ struct v4l2_mbus_framefmt fmt;
+
+ if (format->type != video->type)
+ return -EINVAL;
+
+ mutex_lock(&video->mutex);
+
+ /* Fill the bytesperline and sizeimage fields by converting to media bus
+ * format and back to pixel format.
+ */
+ iss_video_pix_to_mbus(&format->fmt.pix, &fmt);
+ iss_video_mbus_to_pix(video, &fmt, &format->fmt.pix);
+
+ vfh->format = *format;
+
+ mutex_unlock(&video->mutex);
+ return 0;
+}
+
+static int
+iss_video_try_format(struct file *file, void *fh, struct v4l2_format *format)
+{
+ struct iss_video *video = video_drvdata(file);
+ struct v4l2_subdev_format fmt;
+ struct v4l2_subdev *subdev;
+ u32 pad;
+ int ret;
+
+ if (format->type != video->type)
+ return -EINVAL;
+
+ subdev = iss_video_remote_subdev(video, &pad);
+ if (subdev == NULL)
+ return -EINVAL;
+
+ iss_video_pix_to_mbus(&format->fmt.pix, &fmt.format);
+
+ fmt.pad = pad;
+ fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &fmt);
+ if (ret)
+ return ret;
+
+ iss_video_mbus_to_pix(video, &fmt.format, &format->fmt.pix);
+ return 0;
+}
+
+static int
+iss_video_cropcap(struct file *file, void *fh, struct v4l2_cropcap *cropcap)
+{
+ struct iss_video *video = video_drvdata(file);
+ struct v4l2_subdev *subdev;
+ int ret;
+
+ subdev = iss_video_remote_subdev(video, NULL);
+ if (subdev == NULL)
+ return -EINVAL;
+
+ mutex_lock(&video->mutex);
+ ret = v4l2_subdev_call(subdev, video, cropcap, cropcap);
+ mutex_unlock(&video->mutex);
+
+ return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
+}
+
+static int
+iss_video_get_crop(struct file *file, void *fh, struct v4l2_crop *crop)
+{
+ struct iss_video *video = video_drvdata(file);
+ struct v4l2_subdev_format format;
+ struct v4l2_subdev *subdev;
+ u32 pad;
+ int ret;
+
+ subdev = iss_video_remote_subdev(video, &pad);
+ if (subdev == NULL)
+ return -EINVAL;
+
+ /* Try the get crop operation first and fallback to get format if not
+ * implemented.
+ */
+ ret = v4l2_subdev_call(subdev, video, g_crop, crop);
+ if (ret != -ENOIOCTLCMD)
+ return ret;
+
+ format.pad = pad;
+ format.which = V4L2_SUBDEV_FORMAT_ACTIVE;
+ ret = v4l2_subdev_call(subdev, pad, get_fmt, NULL, &format);
+ if (ret < 0)
+ return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
+
+ crop->c.left = 0;
+ crop->c.top = 0;
+ crop->c.width = format.format.width;
+ crop->c.height = format.format.height;
+
+ return 0;
+}
+
+static int
+iss_video_set_crop(struct file *file, void *fh, const struct v4l2_crop *crop)
+{
+ struct iss_video *video = video_drvdata(file);
+ struct v4l2_subdev *subdev;
+ int ret;
+
+ subdev = iss_video_remote_subdev(video, NULL);
+ if (subdev == NULL)
+ return -EINVAL;
+
+ mutex_lock(&video->mutex);
+ ret = v4l2_subdev_call(subdev, video, s_crop, crop);
+ mutex_unlock(&video->mutex);
+
+ return ret == -ENOIOCTLCMD ? -ENOTTY : ret;
+}
+
+static int
+iss_video_get_param(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+ struct iss_video *video = video_drvdata(file);
+
+ if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
+ video->type != a->type)
+ return -EINVAL;
+
+ memset(a, 0, sizeof(*a));
+ a->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+ a->parm.output.capability = V4L2_CAP_TIMEPERFRAME;
+ a->parm.output.timeperframe = vfh->timeperframe;
+
+ return 0;
+}
+
+static int
+iss_video_set_param(struct file *file, void *fh, struct v4l2_streamparm *a)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+ struct iss_video *video = video_drvdata(file);
+
+ if (video->type != V4L2_BUF_TYPE_VIDEO_OUTPUT ||
+ video->type != a->type)
+ return -EINVAL;
+
+ if (a->parm.output.timeperframe.denominator == 0)
+ a->parm.output.timeperframe.denominator = 1;
+
+ vfh->timeperframe = a->parm.output.timeperframe;
+
+ return 0;
+}
+
+static int
+iss_video_reqbufs(struct file *file, void *fh, struct v4l2_requestbuffers *rb)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+
+ return vb2_reqbufs(&vfh->queue, rb);
+}
+
+static int
+iss_video_querybuf(struct file *file, void *fh, struct v4l2_buffer *b)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+
+ return vb2_querybuf(&vfh->queue, b);
+}
+
+static int
+iss_video_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+
+ return vb2_qbuf(&vfh->queue, b);
+}
+
+static int
+iss_video_expbuf(struct file *file, void *fh, struct v4l2_exportbuffer *e)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+
+ return vb2_expbuf(&vfh->queue, e);
+}
+
+static int
+iss_video_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+
+ return vb2_dqbuf(&vfh->queue, b, file->f_flags & O_NONBLOCK);
+}
+
+/*
+ * Stream management
+ *
+ * Every ISS pipeline has a single input and a single output. The input can be
+ * either a sensor or a video node. The output is always a video node.
+ *
+ * As every pipeline has an output video node, the ISS video objects at the
+ * pipeline output stores the pipeline state. It tracks the streaming state of
+ * both the input and output, as well as the availability of buffers.
+ *
+ * In sensor-to-memory mode, frames are always available at the pipeline input.
+ * Starting the sensor usually requires I2C transfers and must be done in
+ * interruptible context. The pipeline is started and stopped synchronously
+ * to the stream on/off commands. All modules in the pipeline will get their
+ * subdev set stream handler called. The module at the end of the pipeline must
+ * delay starting the hardware until buffers are available at its output.
+ *
+ * In memory-to-memory mode, starting/stopping the stream requires
+ * synchronization between the input and output. ISS modules can't be stopped
+ * in the middle of a frame, and at least some of the modules seem to become
+ * busy as soon as they're started, even if they don't receive a frame start
+ * event. For that reason frames need to be processed in single-shot mode. The
+ * driver needs to wait until a frame is completely processed and written to
+ * memory before restarting the pipeline for the next frame. Pipelined
+ * processing might be possible but requires more testing.
+ *
+ * Stream start must be delayed until buffers are available at both the input
+ * and output. The pipeline must be started in the videobuf queue callback with
+ * the buffers queue spinlock held. The modules subdev set stream operation must
+ * not sleep.
+ */
+static int
+iss_video_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+ struct iss_video *video = video_drvdata(file);
+ struct media_entity_graph graph;
+ struct media_entity *entity;
+ enum iss_pipeline_state state;
+ struct iss_pipeline *pipe;
+ struct iss_video *far_end;
+ unsigned long flags;
+ int ret;
+
+ if (type != video->type)
+ return -EINVAL;
+
+ mutex_lock(&video->stream_lock);
+
+ /* Start streaming on the pipeline. No link touching an entity in the
+ * pipeline can be activated or deactivated once streaming is started.
+ */
+ pipe = video->video.entity.pipe
+ ? to_iss_pipeline(&video->video.entity) : &video->pipe;
+ pipe->external = NULL;
+ pipe->external_rate = 0;
+ pipe->external_bpp = 0;
+ pipe->entities = 0;
+
+ if (video->iss->pdata->set_constraints)
+ video->iss->pdata->set_constraints(video->iss, true);
+
+ ret = media_entity_pipeline_start(&video->video.entity, &pipe->pipe);
+ if (ret < 0)
+ goto err_media_entity_pipeline_start;
+
+ entity = &video->video.entity;
+ media_entity_graph_walk_start(&graph, entity);
+ while ((entity = media_entity_graph_walk_next(&graph)))
+ pipe->entities |= 1 << entity->id;
+
+ /* Verify that the currently configured format matches the output of
+ * the connected subdev.
+ */
+ ret = iss_video_check_format(video, vfh);
+ if (ret < 0)
+ goto err_iss_video_check_format;
+
+ video->bpl_padding = ret;
+ video->bpl_value = vfh->format.fmt.pix.bytesperline;
+
+ /* Find the ISS video node connected at the far end of the pipeline and
+ * update the pipeline.
+ */
+ far_end = iss_video_far_end(video);
+
+ if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
+ state = ISS_PIPELINE_STREAM_OUTPUT | ISS_PIPELINE_IDLE_OUTPUT;
+ pipe->input = far_end;
+ pipe->output = video;
+ } else {
+ if (far_end == NULL) {
+ ret = -EPIPE;
+ goto err_iss_video_check_format;
+ }
+
+ state = ISS_PIPELINE_STREAM_INPUT | ISS_PIPELINE_IDLE_INPUT;
+ pipe->input = video;
+ pipe->output = far_end;
+ }
+
+ spin_lock_irqsave(&pipe->lock, flags);
+ pipe->state &= ~ISS_PIPELINE_STREAM;
+ pipe->state |= state;
+ spin_unlock_irqrestore(&pipe->lock, flags);
+
+ /* Set the maximum time per frame as the value requested by userspace.
+ * This is a soft limit that can be overridden if the hardware doesn't
+ * support the request limit.
+ */
+ if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
+ pipe->max_timeperframe = vfh->timeperframe;
+
+ video->queue = &vfh->queue;
+ INIT_LIST_HEAD(&video->dmaqueue);
+ video->error = false;
+ atomic_set(&pipe->frame_number, -1);
+
+ ret = vb2_streamon(&vfh->queue, type);
+ if (ret < 0)
+ goto err_iss_video_check_format;
+
+ /* In sensor-to-memory mode, the stream can be started synchronously
+ * to the stream on command. In memory-to-memory mode, it will be
+ * started when buffers are queued on both the input and output.
+ */
+ if (pipe->input == NULL) {
+ unsigned long flags;
+
+ ret = omap4iss_pipeline_set_stream(pipe,
+ ISS_PIPELINE_STREAM_CONTINUOUS);
+ if (ret < 0)
+ goto err_omap4iss_set_stream;
+ spin_lock_irqsave(&video->qlock, flags);
+ if (list_empty(&video->dmaqueue))
+ video->dmaqueue_flags |= ISS_VIDEO_DMAQUEUE_UNDERRUN;
+ spin_unlock_irqrestore(&video->qlock, flags);
+ }
+
+ mutex_unlock(&video->stream_lock);
+ return 0;
+
+err_omap4iss_set_stream:
+ vb2_streamoff(&vfh->queue, type);
+err_iss_video_check_format:
+ media_entity_pipeline_stop(&video->video.entity);
+err_media_entity_pipeline_start:
+ if (video->iss->pdata->set_constraints)
+ video->iss->pdata->set_constraints(video->iss, false);
+ video->queue = NULL;
+
+ mutex_unlock(&video->stream_lock);
+ return ret;
+}
+
+static int
+iss_video_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(fh);
+ struct iss_video *video = video_drvdata(file);
+ struct iss_pipeline *pipe = to_iss_pipeline(&video->video.entity);
+ enum iss_pipeline_state state;
+ unsigned long flags;
+
+ if (type != video->type)
+ return -EINVAL;
+
+ mutex_lock(&video->stream_lock);
+
+ if (!vb2_is_streaming(&vfh->queue))
+ goto done;
+
+ /* Update the pipeline state. */
+ if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ state = ISS_PIPELINE_STREAM_OUTPUT
+ | ISS_PIPELINE_QUEUE_OUTPUT;
+ else
+ state = ISS_PIPELINE_STREAM_INPUT
+ | ISS_PIPELINE_QUEUE_INPUT;
+
+ spin_lock_irqsave(&pipe->lock, flags);
+ pipe->state &= ~state;
+ spin_unlock_irqrestore(&pipe->lock, flags);
+
+ /* Stop the stream. */
+ omap4iss_pipeline_set_stream(pipe, ISS_PIPELINE_STREAM_STOPPED);
+ vb2_streamoff(&vfh->queue, type);
+ video->queue = NULL;
+
+ if (video->iss->pdata->set_constraints)
+ video->iss->pdata->set_constraints(video->iss, false);
+ media_entity_pipeline_stop(&video->video.entity);
+
+done:
+ mutex_unlock(&video->stream_lock);
+ return 0;
+}
+
+static int
+iss_video_enum_input(struct file *file, void *fh, struct v4l2_input *input)
+{
+ if (input->index > 0)
+ return -EINVAL;
+
+ strlcpy(input->name, "camera", sizeof(input->name));
+ input->type = V4L2_INPUT_TYPE_CAMERA;
+
+ return 0;
+}
+
+static int
+iss_video_g_input(struct file *file, void *fh, unsigned int *input)
+{
+ *input = 0;
+
+ return 0;
+}
+
+static int
+iss_video_s_input(struct file *file, void *fh, unsigned int input)
+{
+ return input == 0 ? 0 : -EINVAL;
+}
+
+static const struct v4l2_ioctl_ops iss_video_ioctl_ops = {
+ .vidioc_querycap = iss_video_querycap,
+ .vidioc_enum_fmt_vid_cap = iss_video_enum_format,
+ .vidioc_g_fmt_vid_cap = iss_video_get_format,
+ .vidioc_s_fmt_vid_cap = iss_video_set_format,
+ .vidioc_try_fmt_vid_cap = iss_video_try_format,
+ .vidioc_g_fmt_vid_out = iss_video_get_format,
+ .vidioc_s_fmt_vid_out = iss_video_set_format,
+ .vidioc_try_fmt_vid_out = iss_video_try_format,
+ .vidioc_cropcap = iss_video_cropcap,
+ .vidioc_g_crop = iss_video_get_crop,
+ .vidioc_s_crop = iss_video_set_crop,
+ .vidioc_g_parm = iss_video_get_param,
+ .vidioc_s_parm = iss_video_set_param,
+ .vidioc_reqbufs = iss_video_reqbufs,
+ .vidioc_querybuf = iss_video_querybuf,
+ .vidioc_qbuf = iss_video_qbuf,
+ .vidioc_expbuf = iss_video_expbuf,
+ .vidioc_dqbuf = iss_video_dqbuf,
+ .vidioc_streamon = iss_video_streamon,
+ .vidioc_streamoff = iss_video_streamoff,
+ .vidioc_enum_input = iss_video_enum_input,
+ .vidioc_g_input = iss_video_g_input,
+ .vidioc_s_input = iss_video_s_input,
+};
+
+/* -----------------------------------------------------------------------------
+ * V4L2 file operations
+ */
+
+static int iss_video_open(struct file *file)
+{
+ struct iss_video *video = video_drvdata(file);
+ struct iss_video_fh *handle;
+ struct vb2_queue *q;
+ int ret = 0;
+
+ handle = kzalloc(sizeof(*handle), GFP_KERNEL);
+ if (handle == NULL)
+ return -ENOMEM;
+
+ v4l2_fh_init(&handle->vfh, &video->video);
+ v4l2_fh_add(&handle->vfh);
+
+ /* If this is the first user, initialise the pipeline. */
+ if (omap4iss_get(video->iss) == NULL) {
+ ret = -EBUSY;
+ goto done;
+ }
+
+ ret = omap4iss_pipeline_pm_use(&video->video.entity, 1);
+ if (ret < 0) {
+ omap4iss_put(video->iss);
+ goto done;
+ }
+
+ video->alloc_ctx = vb2_dma_contig_init_ctx(video->iss->dev);
+ if (IS_ERR(video->alloc_ctx)) {
+ ret = PTR_ERR(video->alloc_ctx);
+ omap4iss_put(video->iss);
+ goto done;
+ }
+
+ q = &handle->queue;
+
+ q->type = video->type;
+ q->io_modes = VB2_MMAP | VB2_DMABUF;
+ q->drv_priv = handle;
+ q->ops = &iss_video_vb2ops;
+ q->mem_ops = &vb2_dma_contig_memops;
+ q->buf_struct_size = sizeof(struct iss_buffer);
+ q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+
+ ret = vb2_queue_init(q);
+ if (ret) {
+ omap4iss_put(video->iss);
+ goto done;
+ }
+
+ memset(&handle->format, 0, sizeof(handle->format));
+ handle->format.type = video->type;
+ handle->timeperframe.denominator = 1;
+
+ handle->video = video;
+ file->private_data = &handle->vfh;
+
+done:
+ if (ret < 0) {
+ v4l2_fh_del(&handle->vfh);
+ kfree(handle);
+ }
+
+ return ret;
+}
+
+static int iss_video_release(struct file *file)
+{
+ struct iss_video *video = video_drvdata(file);
+ struct v4l2_fh *vfh = file->private_data;
+ struct iss_video_fh *handle = to_iss_video_fh(vfh);
+
+ /* Disable streaming and free the buffers queue resources. */
+ iss_video_streamoff(file, vfh, video->type);
+
+ omap4iss_pipeline_pm_use(&video->video.entity, 0);
+
+ /* Release the videobuf2 queue */
+ vb2_queue_release(&handle->queue);
+
+ /* Release the file handle. */
+ v4l2_fh_del(vfh);
+ kfree(handle);
+ file->private_data = NULL;
+
+ omap4iss_put(video->iss);
+
+ return 0;
+}
+
+static unsigned int iss_video_poll(struct file *file, poll_table *wait)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
+
+ return vb2_poll(&vfh->queue, file, wait);
+}
+
+static int iss_video_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct iss_video_fh *vfh = to_iss_video_fh(file->private_data);
+
+ return vb2_mmap(&vfh->queue, vma);
+}
+
+static struct v4l2_file_operations iss_video_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = video_ioctl2,
+ .open = iss_video_open,
+ .release = iss_video_release,
+ .poll = iss_video_poll,
+ .mmap = iss_video_mmap,
+};
+
+/* -----------------------------------------------------------------------------
+ * ISS video core
+ */
+
+static const struct iss_video_operations iss_video_dummy_ops = {
+};
+
+int omap4iss_video_init(struct iss_video *video, const char *name)
+{
+ const char *direction;
+ int ret;
+
+ switch (video->type) {
+ case V4L2_BUF_TYPE_VIDEO_CAPTURE:
+ direction = "output";
+ video->pad.flags = MEDIA_PAD_FL_SINK;
+ break;
+ case V4L2_BUF_TYPE_VIDEO_OUTPUT:
+ direction = "input";
+ video->pad.flags = MEDIA_PAD_FL_SOURCE;
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ ret = media_entity_init(&video->video.entity, 1, &video->pad, 0);
+ if (ret < 0)
+ return ret;
+
+ spin_lock_init(&video->qlock);
+ mutex_init(&video->mutex);
+ atomic_set(&video->active, 0);
+
+ spin_lock_init(&video->pipe.lock);
+ mutex_init(&video->stream_lock);
+
+ /* Initialize the video device. */
+ if (video->ops == NULL)
+ video->ops = &iss_video_dummy_ops;
+
+ video->video.fops = &iss_video_fops;
+ snprintf(video->video.name, sizeof(video->video.name),
+ "OMAP4 ISS %s %s", name, direction);
+ video->video.vfl_type = VFL_TYPE_GRABBER;
+ video->video.release = video_device_release_empty;
+ video->video.ioctl_ops = &iss_video_ioctl_ops;
+ video->pipe.stream_state = ISS_PIPELINE_STREAM_STOPPED;
+
+ video_set_drvdata(&video->video, video);
+
+ return 0;
+}
+
+void omap4iss_video_cleanup(struct iss_video *video)
+{
+ media_entity_cleanup(&video->video.entity);
+ mutex_destroy(&video->stream_lock);
+ mutex_destroy(&video->mutex);
+}
+
+int omap4iss_video_register(struct iss_video *video, struct v4l2_device *vdev)
+{
+ int ret;
+
+ video->video.v4l2_dev = vdev;
+
+ ret = video_register_device(&video->video, VFL_TYPE_GRABBER, -1);
+ if (ret < 0)
+ dev_err(video->iss->dev,
+ "could not register video device (%d)\n", ret);
+
+ return ret;
+}
+
+void omap4iss_video_unregister(struct iss_video *video)
+{
+ video_unregister_device(&video->video);
+}
Code Review / kvmfornfv.git / blobdiff