drivers/mmc/host/wbsd.c

File Facts

System

Linux kernel

Corpus path

drivers/mmc/host/wbsd.c

Extension

.c

Size

40325 bytes

Lines

2000

Domain

Driver Families

Bucket

drivers/mmc

Inferred role

Driver Families: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• 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/module.h
• linux/moduleparam.h
• linux/init.h
• linux/ioport.h
• linux/platform_device.h
• linux/interrupt.h
• linux/dma-mapping.h
• linux/delay.h
• linux/pnp.h
• linux/highmem.h
• linux/mmc/host.h
• linux/mmc/mmc.h
• linux/mmc/sd.h
• linux/scatterlist.h
• linux/slab.h
• asm/io.h
• asm/dma.h
• wbsd.h

Detected Declarations

• function wbsd_unlock_config
• function wbsd_lock_config
• function wbsd_write_config
• function wbsd_read_config
• function wbsd_write_index
• function wbsd_read_index
• function wbsd_init_device
• function wbsd_reset
• function wbsd_request_end
• function wbsd_init_sg
• function wbsd_next_sg
• function wbsd_sg_to_dma
• function wbsd_dma_to_sg
• function wbsd_get_short_reply
• function wbsd_get_long_reply
• function wbsd_send_command
• function wbsd_empty_fifo
• function length
• function wbsd_fill_fifo
• function length
• function wbsd_prepare_data
• function levels
• function wbsd_finish_data
• function wbsd_request
• function wbsd_set_ios
• function wbsd_get_ro
• function wbsd_reset_ignore
• function wbsd_card_bh_work
• function wbsd_fifo_bh_work
• function wbsd_crc_bh_work
• function wbsd_timeout_bh_work
• function wbsd_finish_bh_work
• function wbsd_irq
• function wbsd_alloc_mmc
• function wbsd_free_mmc
• function wbsd_scan
• function wbsd_request_region
• function wbsd_release_regions
• function wbsd_request_dma
• function wbsd_release_dma
• function wbsd_request_irq
• function wbsd_release_irq
• function wbsd_request_resources
• function wbsd_release_resources
• function wbsd_chip_config
• function wbsd_chip_validate
• function wbsd_chip_poweroff
• function wbsd_init

Annotated Snippet

module_init(wbsd_drv_init);
module_exit(wbsd_drv_exit);
#ifdef CONFIG_PNP
module_param_hw_named(nopnp, param_nopnp, uint, other, 0444);
#endif
module_param_hw_named(io, param_io, uint, ioport, 0444);
module_param_hw_named(irq, param_irq, uint, irq, 0444);
module_param_hw_named(dma, param_dma, int, dma, 0444);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pierre Ossman <pierre@ossman.eu>");
MODULE_DESCRIPTION("Winbond W83L51xD SD/MMC card interface driver");

#ifdef CONFIG_PNP
MODULE_PARM_DESC(nopnp, "Scan for device instead of relying on PNP. (default 0)");
#endif
MODULE_PARM_DESC(io, "I/O base to allocate. Must be 8 byte aligned. (default 0x248)");
MODULE_PARM_DESC(irq, "IRQ to allocate. (default 6)");
MODULE_PARM_DESC(dma, "DMA channel to allocate. -1 for no DMA. (default 2)");

Annotation

• Immediate include surface: `linux/module.h`, `linux/moduleparam.h`, `linux/init.h`, `linux/ioport.h`, `linux/platform_device.h`, `linux/interrupt.h`, `linux/dma-mapping.h`, `linux/delay.h`.
• Detected declarations: `function wbsd_unlock_config`, `function wbsd_lock_config`, `function wbsd_write_config`, `function wbsd_read_config`, `function wbsd_write_index`, `function wbsd_read_index`, `function wbsd_init_device`, `function wbsd_reset`, `function wbsd_request_end`, `function wbsd_init_sg`.
• Atlas domain: Driver Families / drivers/mmc.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
• 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.