drivers/i2c/busses/i2c-eg20t.c

File Facts

System

Linux kernel

Corpus path

drivers/i2c/busses/i2c-eg20t.c

Extension

.c

Size

24024 bytes

Lines

890

Domain

Driver Families

Bucket

drivers/i2c

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.
• 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/kernel.h
• linux/delay.h
• linux/errno.h
• linux/i2c.h
• linux/fs.h
• linux/io.h
• linux/types.h
• linux/interrupt.h
• linux/jiffies.h
• linux/pci.h
• linux/mutex.h
• linux/ktime.h
• linux/slab.h

Detected Declarations

• struct i2c_algo_pch_data
• struct adapter_info
• function pch_setbit
• function pch_clrbit
• function pch_i2c_init
• function pch_i2c_wait_for_bus_idle
• function pch_i2c_start
• function pch_i2c_stop
• function pch_i2c_wait_for_check_xfer
• function pch_i2c_repstart
• function pch_i2c_writebytes
• function pch_i2c_sendack
• function pch_i2c_sendnack
• function pch_i2c_restart
• function pch_i2c_readbytes
• function pch_i2c_cb
• function pch_i2c_handler
• function pch_i2c_xfer
• function pch_i2c_func
• function pch_i2c_disbl_int
• function pch_i2c_probe
• function pch_i2c_remove
• function pch_i2c_suspend
• function pch_i2c_resume

Annotated Snippet

static struct pci_driver pch_pcidriver = {
	.name = KBUILD_MODNAME,
	.id_table = pch_pcidev_id,
	.probe = pch_i2c_probe,
	.remove = pch_i2c_remove,
	.driver.pm = &pch_i2c_pm_ops,
};

module_pci_driver(pch_pcidriver);

MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semico ML7213/ML7223/ML7831 IOH I2C");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Tomoya MORINAGA. <tomoya.rohm@gmail.com>");
module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR));
module_param(pch_clk, int, (S_IRUSR | S_IWUSR));

Annotation

• Immediate include surface: `linux/module.h`, `linux/kernel.h`, `linux/delay.h`, `linux/errno.h`, `linux/i2c.h`, `linux/fs.h`, `linux/io.h`, `linux/types.h`.
• Detected declarations: `struct i2c_algo_pch_data`, `struct adapter_info`, `function pch_setbit`, `function pch_clrbit`, `function pch_i2c_init`, `function pch_i2c_wait_for_bus_idle`, `function pch_i2c_start`, `function pch_i2c_stop`, `function pch_i2c_wait_for_check_xfer`, `function pch_i2c_repstart`.
• Atlas domain: Driver Families / drivers/i2c.
• Implementation status: pattern 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.