drivers/i2c/busses/i2c-imx.c

File Facts

System

Linux kernel

Corpus path

drivers/i2c/busses/i2c-imx.c

Extension

.c

Size

56979 bytes

Lines

1992

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/acpi.h
• linux/clk.h
• linux/cleanup.h
• linux/completion.h
• linux/delay.h
• linux/dma-mapping.h
• linux/dmaengine.h
• linux/dmapool.h
• linux/err.h
• linux/errno.h
• linux/gpio/consumer.h
• linux/i2c.h
• linux/init.h
• linux/interrupt.h
• linux/io.h
• linux/iopoll.h
• linux/kernel.h
• linux/spinlock.h
• linux/hrtimer.h
• linux/module.h
• linux/of.h
• linux/of_dma.h
• linux/pinctrl/consumer.h
• linux/platform_data/i2c-imx.h
• linux/platform_device.h
• linux/pm_runtime.h
• linux/sched.h
• linux/slab.h

Detected Declarations

• struct imx_i2c_clk_pair
• struct imx_i2c_hwdata
• struct imx_i2c_dma
• struct imx_i2c_struct
• enum imx_i2c_type
• enum imx_i2c_state
• function is_imx1_i2c
• function is_vf610_i2c
• function imx_i2c_write_reg
• function imx_i2c_read_reg
• function i2c_imx_clear_irq
• function i2c_imx_reset_regs
• function i2c_imx_dma_request
• function i2c_imx_dma_callback
• function i2c_imx_dma_xfer
• function i2c_imx_dma_free
• function i2c_imx_bus_busy
• function i2c_imx_trx_complete
• function i2c_imx_acked
• function i2c_imx_set_clk
• function i2c_imx_clk_notifier_call
• function i2c_imx_start
• function i2c_imx_stop
• function i2c_imx_enable_bus_idle
• function i2c_imx_slave_event
• function i2c_imx_slave_finish_op
• function i2c_imx_slave_handle
• function i2c_imx_slave_timeout
• function i2c_imx_slave_init
• function i2c_imx_reg_slave
• function i2c_imx_unreg_slave
• function i2c_imx_isr_acked
• function i2c_imx_isr_write
• function i2c_imx_isr_read
• function i2c_imx_isr_read_continue
• function i2c_imx_isr_read_block_data_len
• function i2c_imx_master_isr
• function i2c_imx_isr
• function scoped_guard
• function i2c_imx_dma_write
• function i2c_imx_prepare_read
• function i2c_imx_dma_read
• function i2c_imx_atomic_write
• function i2c_imx_write
• function i2c_imx_atomic_read
• function i2c_imx_read
• function i2c_imx_xfer_common
• function gpiod_get_value_cansleep

Annotated Snippet

subsys_initcall(i2c_adap_imx_init);

static void __exit i2c_adap_imx_exit(void)
{
	platform_driver_unregister(&i2c_imx_driver);
}
module_exit(i2c_adap_imx_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Darius Augulis");
MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus");
MODULE_ALIAS("platform:" DRIVER_NAME);

Annotation

• Immediate include surface: `linux/acpi.h`, `linux/clk.h`, `linux/cleanup.h`, `linux/completion.h`, `linux/delay.h`, `linux/dma-mapping.h`, `linux/dmaengine.h`, `linux/dmapool.h`.
• Detected declarations: `struct imx_i2c_clk_pair`, `struct imx_i2c_hwdata`, `struct imx_i2c_dma`, `struct imx_i2c_struct`, `enum imx_i2c_type`, `enum imx_i2c_state`, `function is_imx1_i2c`, `function is_vf610_i2c`, `function imx_i2c_write_reg`, `function imx_i2c_read_reg`.
• 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.