drivers/media/pci/saa7164/saa7164-vbi.c

Source file repositories/reference/linux-study-clean/drivers/media/pci/saa7164/saa7164-vbi.c

File Facts

System
Linux kernel
Corpus path
drivers/media/pci/saa7164/saa7164-vbi.c
Extension
.c
Size
19655 bytes
Lines
766
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 (!buf) {
			printk(KERN_ERR "%s() failed (errno = %d), unable to allocate buffer\n",
				__func__, result);
			result = -ENOMEM;
			goto failed;
		} else {

			mutex_lock(&port->dmaqueue_lock);
			list_add_tail(&buf->list, &port->dmaqueue.list);
			mutex_unlock(&port->dmaqueue_lock);

		}
	}

	/* Allocate some kernel buffers for copying
	 * to userpsace.
	 */
	len = params->numberoflines * params->pitch;

	if (vbi_buffers < 16)
		vbi_buffers = 16;
	if (vbi_buffers > 512)
		vbi_buffers = 512;

	for (i = 0; i < vbi_buffers; i++) {

		ubuf = saa7164_buffer_alloc_user(dev, len);
		if (ubuf) {
			mutex_lock(&port->dmaqueue_lock);
			list_add_tail(&ubuf->list, &port->list_buf_free.list);
			mutex_unlock(&port->dmaqueue_lock);
		}

	}

	result = 0;

failed:
	return result;
}


static int saa7164_vbi_initialize(struct saa7164_port *port)
{
	saa7164_vbi_configure(port);
	return 0;
}

/* -- V4L2 --------------------------------------------------------- */
static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id id)
{
	struct saa7164_vbi_fh *fh = to_saa7164_vbi_fh(file);

	return saa7164_s_std(fh->port->enc_port, id);
}

static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *id)
{
	struct saa7164_vbi_fh *fh = to_saa7164_vbi_fh(file);

	return saa7164_g_std(fh->port->enc_port, id);
}

static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
	struct saa7164_vbi_fh *fh = to_saa7164_vbi_fh(file);

	return saa7164_g_input(fh->port->enc_port, i);
}

static int vidioc_s_input(struct file *file, void *priv, unsigned int i)
{
	struct saa7164_vbi_fh *fh = to_saa7164_vbi_fh(file);

	return saa7164_s_input(fh->port->enc_port, i);
}

static int vidioc_g_frequency(struct file *file, void *priv,
	struct v4l2_frequency *f)
{
	struct saa7164_vbi_fh *fh = to_saa7164_vbi_fh(file);

	return saa7164_g_frequency(fh->port->enc_port, f);
}

static int vidioc_s_frequency(struct file *file, void *priv,
	const struct v4l2_frequency *f)
{
	struct saa7164_vbi_fh *fh = to_saa7164_vbi_fh(file);
	int ret = saa7164_s_frequency(fh->port->enc_port, f);

Annotation

Implementation Notes