drivers/media/platform/samsung/exynos4-is/fimc-lite.c

Source file repositories/reference/linux-study-clean/drivers/media/platform/samsung/exynos4-is/fimc-lite.c

File Facts

System
Linux kernel
Corpus path
drivers/media/platform/samsung/exynos4-is/fimc-lite.c
Extension
.c
Size
43872 bytes
Lines
1665
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (vb2_plane_size(vb, i) < size) {
			v4l2_err(&fimc->ve.vdev,
				 "User buffer too small (%ld < %ld)\n",
				 vb2_plane_size(vb, i), size);
			return -EINVAL;
		}
		vb2_set_plane_payload(vb, i, size);
	}

	return 0;
}

static void buffer_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct flite_buffer *buf
		= container_of(vbuf, struct flite_buffer, vb);
	struct fimc_lite *fimc = vb2_get_drv_priv(vb->vb2_queue);
	unsigned long flags;

	spin_lock_irqsave(&fimc->slock, flags);
	buf->addr = vb2_dma_contig_plane_dma_addr(vb, 0);

	buf->index = fimc->buf_index++;
	if (fimc->buf_index >= fimc->reqbufs_count)
		fimc->buf_index = 0;

	if (!test_bit(ST_FLITE_SUSPENDED, &fimc->state) &&
	    !test_bit(ST_FLITE_STREAM, &fimc->state) &&
	    list_empty(&fimc->active_buf_q)) {
		flite_hw_set_dma_buffer(fimc, buf);
		fimc_lite_active_queue_add(fimc, buf);
	} else {
		fimc_lite_pending_queue_add(fimc, buf);
	}

	if (vb2_is_streaming(&fimc->vb_queue) &&
	    !list_empty(&fimc->pending_buf_q) &&
	    !test_and_set_bit(ST_FLITE_STREAM, &fimc->state)) {
		flite_hw_capture_start(fimc);
		spin_unlock_irqrestore(&fimc->slock, flags);

		if (!test_and_set_bit(ST_SENSOR_STREAM, &fimc->state))
			fimc_pipeline_call(&fimc->ve, set_stream, 1);
		return;
	}
	spin_unlock_irqrestore(&fimc->slock, flags);
}

static const struct vb2_ops fimc_lite_qops = {
	.queue_setup	 = queue_setup,
	.buf_prepare	 = buffer_prepare,
	.buf_queue	 = buffer_queue,
	.start_streaming = start_streaming,
	.stop_streaming	 = stop_streaming,
};

static void fimc_lite_clear_event_counters(struct fimc_lite *fimc)
{
	unsigned long flags;

	spin_lock_irqsave(&fimc->slock, flags);
	memset(&fimc->events, 0, sizeof(fimc->events));
	spin_unlock_irqrestore(&fimc->slock, flags);
}

static int fimc_lite_open(struct file *file)
{
	struct fimc_lite *fimc = video_drvdata(file);
	struct media_entity *me = &fimc->ve.vdev.entity;
	int ret;

	mutex_lock(&fimc->lock);
	if (atomic_read(&fimc->out_path) != FIMC_IO_DMA) {
		ret = -EBUSY;
		goto unlock;
	}

	set_bit(ST_FLITE_IN_USE, &fimc->state);
	ret = pm_runtime_resume_and_get(&fimc->pdev->dev);
	if (ret < 0)
		goto err_in_use;

	ret = v4l2_fh_open(file);
	if (ret < 0)
		goto err_pm;

	if (!v4l2_fh_is_singular_file(file) ||
	    atomic_read(&fimc->out_path) != FIMC_IO_DMA)
		goto unlock;

Annotation

Implementation Notes