drivers/media/pci/cx25821/cx25821-core.c

File Facts

System

Linux kernel

Corpus path

drivers/media/pci/cx25821/cx25821-core.c

Extension

.c

Size

35750 bytes

Lines

1387

Domain

Driver Families

Bucket

drivers/media

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 IRQ or DMA behavior; this matters for the representative real-device path.
• 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/i2c.h
• linux/slab.h
• cx25821.h
• cx25821-sram.h
• cx25821-video.h

Detected Declarations

• function cx25821_risc_decode
• function cx25821_registers_init
• function cx25821_sram_channel_setup
• function cx25821_sram_channel_setup_audio
• function cx25821_sram_channel_dump
• function cx25821_sram_channel_dump_audio
• function cx25821_shutdown
• function cx25821_set_pixel_format
• function cx25821_set_vip_mode
• function cx25821_initialize
• function cx25821_get_resources
• function cx25821_dev_checkrevision
• function cx25821_iounmap
• function cx25821_dev_setup
• function cx25821_dev_unregister
• function cx25821_riscmem_alloc
• function cx25821_risc_buffer
• function cx25821_risc_databuffer_audio
• function cx25821_free_buffer
• function cx25821_irq
• function cx25821_print_irqbits
• function cx25821_initdev
• function cx25821_finidev
• function cx25821_init
• function cx25821_fini
• module init cx25821_init
• export cx25821_sram_channels
• export cx25821_sram_channel_setup_audio
• export cx25821_sram_channel_dump_audio
• export cx25821_dev_unregister
• export cx25821_riscmem_alloc
• export cx25821_risc_databuffer_audio
• export cx25821_print_irqbits
• export cx25821_dev_get

Annotated Snippet

static struct pci_driver cx25821_pci_driver = {
	.name = "cx25821",
	.id_table = cx25821_pci_tbl,
	.probe = cx25821_initdev,
	.remove = cx25821_finidev,
};

static int __init cx25821_init(void)
{
	pr_info("driver loaded\n");
	return pci_register_driver(&cx25821_pci_driver);
}

static void __exit cx25821_fini(void)
{
	pci_unregister_driver(&cx25821_pci_driver);
}

module_init(cx25821_init);
module_exit(cx25821_fini);

Annotation

• Immediate include surface: `linux/i2c.h`, `linux/slab.h`, `cx25821.h`, `cx25821-sram.h`, `cx25821-video.h`.
• Detected declarations: `function cx25821_risc_decode`, `function cx25821_registers_init`, `function cx25821_sram_channel_setup`, `function cx25821_sram_channel_setup_audio`, `function cx25821_sram_channel_dump`, `function cx25821_sram_channel_dump_audio`, `function cx25821_shutdown`, `function cx25821_set_pixel_format`, `function cx25821_set_vip_mode`, `function cx25821_initialize`.
• Atlas domain: Driver Families / drivers/media.
• Implementation status: pattern implementation candidate.
• IRQ or DMA behavior appears here, which is relevant to the selected PCIe/NVMe device path.

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.