drivers/staging/media/av7110/av7110_ca.c

File Facts

System

Linux kernel

Corpus path

drivers/staging/media/av7110/av7110_ca.c

Extension

.c

Size

8977 bytes

Lines

388

Domain

Driver Families

Bucket

drivers/staging

Inferred role

Driver Families: operation-table or driver-model contract

Status

pattern 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.

• 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.
• Defines an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/kernel.h
• linux/types.h
• linux/delay.h
• linux/fs.h
• linux/timer.h
• linux/poll.h
• linux/gfp.h
• av7110.h
• av7110_hw.h
• av7110_ca.h

Detected Declarations

• function Copyright
• function ci_get_data
• function ci_ll_init
• function ci_ll_flush
• function ci_ll_release
• function ci_ll_reset
• function ci_ll_write
• function ci_ll_read
• function dvb_ca_open
• function dvb_ca_poll
• function dvb_ca_ioctl
• function dvb_ca_write
• function dvb_ca_read
• function av7110_ca_register
• function av7110_ca_unregister
• function av7110_ca_init
• function av7110_ca_exit

Annotated Snippet

static const struct file_operations dvb_ca_fops = {
	.owner		= THIS_MODULE,
	.read		= dvb_ca_read,
	.write		= dvb_ca_write,
	.unlocked_ioctl	= dvb_generic_ioctl,
	.open		= dvb_ca_open,
	.release	= dvb_generic_release,
	.poll		= dvb_ca_poll,
	.llseek		= default_llseek,
};

static struct dvb_device dvbdev_ca = {
	.priv		= NULL,
	.users		= 1,
	.writers	= 1,
	.fops		= &dvb_ca_fops,
	.kernel_ioctl	= dvb_ca_ioctl,
};

int av7110_ca_register(struct av7110 *av7110)
{
	return dvb_register_device(&av7110->dvb_adapter, &av7110->ca_dev,
				   &dvbdev_ca, av7110, DVB_DEVICE_CA, 0);
}

void av7110_ca_unregister(struct av7110 *av7110)
{
	dvb_unregister_device(av7110->ca_dev);
}

int av7110_ca_init(struct av7110 *av7110)
{
	return ci_ll_init(&av7110->ci_rbuffer, &av7110->ci_wbuffer, 8192);
}

void av7110_ca_exit(struct av7110 *av7110)
{
	ci_ll_release(&av7110->ci_rbuffer, &av7110->ci_wbuffer);
}

Annotation

• Immediate include surface: `linux/kernel.h`, `linux/types.h`, `linux/delay.h`, `linux/fs.h`, `linux/timer.h`, `linux/poll.h`, `linux/gfp.h`, `av7110.h`.
• Detected declarations: `function Copyright`, `function ci_get_data`, `function ci_ll_init`, `function ci_ll_flush`, `function ci_ll_release`, `function ci_ll_reset`, `function ci_ll_write`, `function ci_ll_read`, `function dvb_ca_open`, `function dvb_ca_poll`.
• Atlas domain: Driver Families / drivers/staging.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.