drivers/media/test-drivers/vivid/vivid-touch-cap.c

Source file repositories/reference/linux-study-clean/drivers/media/test-drivers/vivid/vivid-touch-cap.c

File Facts

System
Linux kernel
Corpus path
drivers/media/test-drivers/vivid/vivid-touch-cap.c
Extension
.c
Size
8868 bytes
Lines
337
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

// SPDX-License-Identifier: GPL-2.0-only
/*
 * vivid-touch-cap.c - touch support functions.
 */

#include "vivid-core.h"
#include "vivid-kthread-touch.h"
#include "vivid-vid-common.h"
#include "vivid-touch-cap.h"

static int touch_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
				 unsigned int *nplanes, unsigned int sizes[],
				 struct device *alloc_devs[])
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	struct v4l2_pix_format *f = &dev->tch_format;
	unsigned int size = f->sizeimage;

	if (*nplanes) {
		if (*nplanes != 1)
			return -EINVAL;
		return sizes[0] < size ? -EINVAL : 0;
	}

	*nplanes = 1;
	sizes[0] = size;
	return 0;
}

static int touch_cap_buf_prepare(struct vb2_buffer *vb)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	struct v4l2_pix_format *f = &dev->tch_format;
	unsigned int size = f->sizeimage;

	if (dev->buf_prepare_error) {
		/*
		 * Error injection: test what happens if buf_prepare() returns
		 * an error.
		 */
		dev->buf_prepare_error = false;
		return -EINVAL;
	}
	if (vb2_plane_size(vb, 0) < size) {
		dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
			__func__, vb2_plane_size(vb, 0), size);
		return -EINVAL;
	}
	vb2_set_plane_payload(vb, 0, size);

	return 0;
}

static void touch_cap_buf_queue(struct vb2_buffer *vb)
{
	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
	struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);

	vbuf->field = V4L2_FIELD_NONE;
	spin_lock(&dev->slock);
	list_add_tail(&buf->list, &dev->touch_cap_active);
	spin_unlock(&dev->slock);
}

static int touch_cap_start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct vivid_dev *dev = vb2_get_drv_priv(vq);
	int err;

	dev->touch_cap_seq_count = 0;
	if (dev->start_streaming_error) {
		dev->start_streaming_error = false;
		err = -EINVAL;
	} else {
		err = vivid_start_generating_touch_cap(dev);
	}
	if (err) {
		struct vivid_buffer *buf, *tmp;

		list_for_each_entry_safe(buf, tmp,
					 &dev->touch_cap_active, list) {
			list_del(&buf->list);
			vb2_buffer_done(&buf->vb.vb2_buf,
					VB2_BUF_STATE_QUEUED);
		}
	}
	return err;
}

Annotation

Implementation Notes