// SPDX-License-Identifier: GPL-2.0+ /* * TI OMAP4 ISS V4L2 Driver - Generic video node * * Copyright (C) 2012 Texas Instruments, Inc. * * Author: Sergio Aguirre */ #include #include #include #include #include #include #include #include #include #include #include #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, }, { 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, }, { 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, }, { 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, }, { 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, }, { 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, }, { 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, }, { MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_DPCM8_1X8, MEDIA_BUS_FMT_SGRBG10_1X10, 0, V4L2_PIX_FMT_SGRBG10DPCM8, 8, }, { 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, }, { 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, }, { 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, }, { 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, }, { 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, }, { 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, }, { 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, }, { 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, }, { MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16, MEDIA_BUS_FMT_UYVY8_1X16, 0, V4L2_PIX_FMT_UYVY, 16, }, { MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16, MEDIA_BUS_FMT_YUYV8_1X16, 0, V4L2_PIX_FMT_YUYV, 16, }, { MEDIA_BUS_FMT_YUYV8_1_5X8, MEDIA_BUS_FMT_YUYV8_1_5X8, MEDIA_BUS_FMT_YUYV8_1_5X8, 0, V4L2_PIX_FMT_NV12, 8, }, }; 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 || !is_media_entity_v4l2_subdev(remote->entity)) 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_graph graph; struct media_entity *entity = &video->video.entity; struct media_device *mdev = entity->graph_obj.mdev; struct iss_video *far_end = NULL; mutex_lock(&mdev->graph_mutex); if (media_graph_walk_init(&graph, mdev)) { mutex_unlock(&mdev->graph_mutex); return NULL; } media_graph_walk_start(&graph, entity); while ((entity = media_graph_walk_next(&graph))) { if (entity == &video->video.entity) continue; if (!is_media_entity_v4l2_video_device(entity)) 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); media_graph_walk_cleanup(&graph); return far_end; } static int __iss_video_get_format(struct iss_video *video, struct v4l2_mbus_framefmt *format) { struct v4l2_subdev_format fmt = { .which = V4L2_SUBDEV_FORMAT_ACTIVE, }; struct v4l2_subdev *subdev; u32 pad; int ret; subdev = iss_video_remote_subdev(video, &pad); if (!subdev) return -EINVAL; fmt.pad = pad; 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, unsigned int *count, unsigned int *num_planes, unsigned int sizes[], struct device *alloc_devs[]) { 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; *count = min(*count, video->capture_mem / PAGE_ALIGN(sizes[0])); return 0; } static void iss_video_buf_cleanup(struct vb2_buffer *vb) { struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); struct iss_buffer *buffer = container_of(vbuf, struct iss_buffer, vb); if (buffer->iss_addr) buffer->iss_addr = 0; } static int iss_video_buf_prepare(struct vb2_buffer *vb) { struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); struct iss_video_fh *vfh = vb2_get_drv_priv(vb->vb2_queue); struct iss_buffer *buffer = container_of(vbuf, 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 vb2_v4l2_buffer *vbuf = to_vb2_v4l2_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(vbuf, 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; 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); buf->vb.vb2_buf.timestamp = ktime_get_ns(); /* * 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.sequence = atomic_inc_return(&pipe->frame_number); else buf->vb.sequence = atomic_read(&pipe->frame_number); vb2_buffer_done(&buf->vb.vb2_buf, 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) { 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.vb2_buf.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, 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); strscpy(cap->driver, ISS_VIDEO_DRIVER_NAME, sizeof(cap->driver)); strscpy(cap->card, video->video.name, sizeof(cap->card)); strscpy(cap->bus_info, "media", sizeof(cap->bus_info)); 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; 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) 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_get_selection(struct file *file, void *fh, struct v4l2_selection *sel) { struct iss_video *video = video_drvdata(file); struct v4l2_subdev_format format; struct v4l2_subdev *subdev; struct v4l2_subdev_selection sdsel = { .which = V4L2_SUBDEV_FORMAT_ACTIVE, .target = sel->target, }; u32 pad; int ret; switch (sel->target) { case V4L2_SEL_TGT_CROP: case V4L2_SEL_TGT_CROP_BOUNDS: case V4L2_SEL_TGT_CROP_DEFAULT: if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) return -EINVAL; break; case V4L2_SEL_TGT_COMPOSE: case V4L2_SEL_TGT_COMPOSE_BOUNDS: case V4L2_SEL_TGT_COMPOSE_DEFAULT: if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) return -EINVAL; break; default: return -EINVAL; } subdev = iss_video_remote_subdev(video, &pad); if (!subdev) return -EINVAL; /* * Try the get selection operation first and fallback to get format if * not implemented. */ sdsel.pad = pad; ret = v4l2_subdev_call(subdev, pad, get_selection, NULL, &sdsel); if (!ret) sel->r = sdsel.r; 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; sel->r.left = 0; sel->r.top = 0; sel->r.width = format.format.width; sel->r.height = format.format.height; return 0; } static int iss_video_set_selection(struct file *file, void *fh, struct v4l2_selection *sel) { struct iss_video *video = video_drvdata(file); struct v4l2_subdev *subdev; struct v4l2_subdev_selection sdsel = { .which = V4L2_SUBDEV_FORMAT_ACTIVE, .target = sel->target, .flags = sel->flags, .r = sel->r, }; u32 pad; int ret; switch (sel->target) { case V4L2_SEL_TGT_CROP: if (video->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) return -EINVAL; break; case V4L2_SEL_TGT_COMPOSE: if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) return -EINVAL; break; default: return -EINVAL; } subdev = iss_video_remote_subdev(video, &pad); if (!subdev) return -EINVAL; sdsel.pad = pad; mutex_lock(&video->mutex); ret = v4l2_subdev_call(subdev, pad, set_selection, NULL, &sdsel); mutex_unlock(&video->mutex); if (!ret) sel->r = sdsel.r; 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 *video = video_drvdata(file); struct iss_video_fh *vfh = to_iss_video_fh(fh); return vb2_qbuf(&vfh->queue, video->video.v4l2_dev->mdev, 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_graph graph; struct media_entity *entity = &video->video.entity; struct media_device *mdev = entity->graph_obj.mdev; 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 = entity->pipe ? to_iss_pipeline(entity) : &video->pipe; pipe->external = NULL; pipe->external_rate = 0; pipe->external_bpp = 0; ret = media_entity_enum_init(&pipe->ent_enum, entity->graph_obj.mdev); if (ret) goto err_graph_walk_init; ret = media_graph_walk_init(&graph, entity->graph_obj.mdev); if (ret) goto err_graph_walk_init; if (video->iss->pdata->set_constraints) video->iss->pdata->set_constraints(video->iss, true); ret = media_pipeline_start(entity, &pipe->pipe); if (ret < 0) goto err_media_pipeline_start; mutex_lock(&mdev->graph_mutex); media_graph_walk_start(&graph, entity); while ((entity = media_graph_walk_next(&graph))) media_entity_enum_set(&pipe->ent_enum, entity); mutex_unlock(&mdev->graph_mutex); /* * 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) { 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) { 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); } media_graph_walk_cleanup(&graph); mutex_unlock(&video->stream_lock); return 0; err_omap4iss_set_stream: vb2_streamoff(&vfh->queue, type); err_iss_video_check_format: media_pipeline_stop(&video->video.entity); err_media_pipeline_start: if (video->iss->pdata->set_constraints) video->iss->pdata->set_constraints(video->iss, false); video->queue = NULL; media_graph_walk_cleanup(&graph); err_graph_walk_init: media_entity_enum_cleanup(&pipe->ent_enum); 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; media_entity_enum_cleanup(&pipe->ent_enum); if (video->iss->pdata->set_constraints) video->iss->pdata->set_constraints(video->iss, false); media_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; strscpy(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_g_selection = iss_video_get_selection, .vidioc_s_selection = iss_video_set_selection, .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) 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)) { ret = -EBUSY; goto done; } ret = v4l2_pipeline_pm_get(&video->video.entity); if (ret < 0) { 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; q->dev = video->iss->dev; 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); v4l2_fh_exit(&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); v4l2_pipeline_pm_put(&video->video.entity); /* Release the videobuf2 queue */ vb2_queue_release(&handle->queue); v4l2_fh_del(vfh); v4l2_fh_exit(vfh); kfree(handle); file->private_data = NULL; omap4iss_put(video->iss); return 0; } static __poll_t 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 const 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_pads_init(&video->video.entity, 1, &video->pad); 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) 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_VIDEO; 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; if (video->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) video->video.device_caps = V4L2_CAP_VIDEO_CAPTURE; else video->video.device_caps = V4L2_CAP_VIDEO_OUTPUT; video->video.device_caps |= V4L2_CAP_STREAMING; ret = video_register_device(&video->video, VFL_TYPE_VIDEO, -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); }