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

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

File Facts

System
Linux kernel
Corpus path
drivers/media/pci/saa7164/saa7164-encoder.c
Extension
.c
Size
30374 bytes
Lines
1145
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 (encoder_buffers < 16)
		encoder_buffers = 16;
	if (encoder_buffers > 512)
		encoder_buffers = 512;

	for (i = 0; i < encoder_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_encoder_initialize(struct saa7164_port *port)
{
	saa7164_encoder_configure(port);
	return 0;
}

/* -- V4L2 --------------------------------------------------------- */
int saa7164_s_std(struct saa7164_port *port, v4l2_std_id id)
{
	struct saa7164_dev *dev = port->dev;
	unsigned int i;

	dprintk(DBGLVL_ENC, "%s(id=0x%x)\n", __func__, (u32)id);

	for (i = 0; i < ARRAY_SIZE(saa7164_tvnorms); i++) {
		if (id & saa7164_tvnorms[i].id)
			break;
	}
	if (i == ARRAY_SIZE(saa7164_tvnorms))
		return -EINVAL;

	port->encodernorm = saa7164_tvnorms[i];
	port->std = id;

	/* Update the audio decoder while is not running in
	 * auto detect mode.
	 */
	saa7164_api_set_audio_std(port);

	dprintk(DBGLVL_ENC, "%s(id=0x%x) OK\n", __func__, (u32)id);

	return 0;
}

static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id id)
{
	struct saa7164_encoder_fh *fh = to_saa7164_encoder_fh(file);

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

int saa7164_g_std(struct saa7164_port *port, v4l2_std_id *id)
{
	*id = port->std;
	return 0;
}

static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *id)
{

Annotation

Implementation Notes