drivers/i2c/busses/i2c-pxa.c

File Facts

System

Linux kernel

Corpus path

drivers/i2c/busses/i2c-pxa.c

Extension

.c

Size

40325 bytes

Lines

1625

Domain

Driver Families

Bucket

drivers/i2c

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/clk.h
• linux/delay.h
• linux/err.h
• linux/errno.h
• linux/gpio/consumer.h
• linux/i2c.h
• linux/init.h
• linux/interrupt.h
• linux/io.h
• linux/kernel.h
• linux/module.h
• linux/of.h
• linux/of_device.h
• linux/pinctrl/consumer.h
• linux/platform_device.h
• linux/platform_data/i2c-pxa.h
• linux/property.h
• linux/slab.h

Detected Declarations

• struct pxa_reg_layout
• struct pxa_i2c
• struct bits
• enum pxa_i2c_types
• function decode_bits
• function decode_ISR
• function decode_ICR
• function i2c_pxa_show_state
• function i2c_pxa_scream_blue_murder
• function i2c_pxa_is_slavemode
• function i2c_pxa_abort
• function i2c_pxa_wait_bus_not_busy
• function i2c_pxa_wait_master
• function i2c_pxa_set_master
• function i2c_pxa_wait_slave
• function i2c_pxa_set_slave
• function i2c_pxa_do_reset
• function i2c_pxa_enable
• function i2c_pxa_reset
• function i2c_pxa_slave_txempty
• function i2c_pxa_slave_rxfull
• function i2c_pxa_slave_start
• function i2c_pxa_slave_stop
• function i2c_pxa_slave_reg
• function i2c_pxa_slave_unreg
• function i2c_pxa_slave_txempty
• function i2c_pxa_slave_rxfull
• function i2c_pxa_slave_start
• function i2c_pxa_slave_stop
• function i2c_pxa_start_message
• function i2c_pxa_stop_message
• function i2c_pxa_send_mastercode
• function i2c_pxa_master_complete
• function i2c_pxa_irq_txempty
• function i2c_pxa_irq_rxfull
• function i2c_pxa_handler
• function i2c_pxa_do_xfer
• function i2c_pxa_internal_xfer
• function i2c_pxa_xfer
• function i2c_pxa_functionality
• function i2c_pxa_pio_set_master
• function i2c_pxa_do_pio_xfer
• function i2c_pxa_pio_xfer
• function i2c_pxa_probe_dt
• function i2c_pxa_probe_pdata
• function i2c_pxa_prepare_recovery
• function i2c_pxa_unprepare_recovery
• function i2c_pxa_init_recovery

Annotated Snippet

subsys_initcall(i2c_adap_pxa_init);
module_exit(i2c_adap_pxa_exit);

Annotation

• Immediate include surface: `linux/clk.h`, `linux/delay.h`, `linux/err.h`, `linux/errno.h`, `linux/gpio/consumer.h`, `linux/i2c.h`, `linux/init.h`, `linux/interrupt.h`.
• Detected declarations: `struct pxa_reg_layout`, `struct pxa_i2c`, `struct bits`, `enum pxa_i2c_types`, `function decode_bits`, `function decode_ISR`, `function decode_ICR`, `function i2c_pxa_show_state`, `function i2c_pxa_scream_blue_murder`, `function i2c_pxa_is_slavemode`.
• Atlas domain: Driver Families / drivers/i2c.
• 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.