drivers/i2c/busses/i2c-i801.c

File Facts

System

Linux kernel

Corpus path

drivers/i2c/busses/i2c-i801.c

Extension

.c

Size

55161 bytes

Lines

1770

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/interrupt.h
• linux/module.h
• linux/pci.h
• linux/kernel.h
• linux/stddef.h
• linux/delay.h
• linux/ioport.h
• linux/init.h
• linux/i2c.h
• linux/i2c-mux.h
• linux/i2c-smbus.h
• linux/acpi.h
• linux/io.h
• linux/dmi.h
• linux/slab.h
• linux/string.h
• linux/completion.h
• linux/err.h
• linux/platform_device.h
• linux/platform_data/itco_wdt.h
• linux/platform_data/x86/p2sb.h
• linux/pm_runtime.h
• linux/mutex.h
• linux/gpio/machine.h
• linux/platform_data/i2c-mux-gpio.h

Detected Declarations

• struct i801_mux_config
• struct i801_priv
• struct dmi_onboard_device_info
• function i801_wait_intr
• function i801_wait_byte_done
• function i801_get_block_len
• function i801_check_and_clear_pec_error
• function i801_check_pre
• function i801_check_post
• function i801_transaction
• function i801_block_transaction_by_block
• function i801_isr_byte_done
• function i801_host_notify_isr
• function i801_isr
• function i801_block_transaction_byte_by_byte
• function i801_smbus_block_transaction
• function i801_set_hstadd
• function i801_simple_transaction
• function i801_smbus_block_transaction
• function i801_i2c_block_transaction
• function i801_access
• function i801_func
• function i801_enable_host_notify
• function i801_disable_host_notify
• function input_apanel_init
• function dmi_check_onboard_device
• function dmi_find_device
• function i801_probe_optional_targets
• function input_apanel_init
• function i801_notifier_call
• function i801_add_mux
• function i801_del_mux
• function i801_add_mux
• function i801_add_tco_cnl
• function i801_add_tco
• function i801_acpi_is_smbus_ioport
• function i801_acpi_io_handler
• function i801_acpi_probe
• function i801_acpi_remove
• function i801_acpi_probe
• function i801_acpi_remove
• function i801_restore_regs
• function i801_probe
• function i801_remove
• function pci_disable_device
• function i801_suspend
• function i801_resume
• function i2c_i801_init

Annotated Snippet

static struct pci_driver i801_driver = {
	.name		= DRV_NAME,
	.id_table	= i801_ids,
	.probe		= i801_probe,
	.remove		= i801_remove,
	.shutdown	= i801_shutdown,
	.driver		= {
		.pm	= pm_sleep_ptr(&i801_pm_ops),
		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
	},
};

static int __init i2c_i801_init(struct pci_driver *drv)
{
	if (dmi_name_in_vendors("FUJITSU"))
		input_apanel_init();
	return pci_register_driver(drv);
}

MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>");
MODULE_DESCRIPTION("I801 SMBus driver");
MODULE_LICENSE("GPL");

module_driver(i801_driver, i2c_i801_init, pci_unregister_driver);

Annotation

• Immediate include surface: `linux/interrupt.h`, `linux/module.h`, `linux/pci.h`, `linux/kernel.h`, `linux/stddef.h`, `linux/delay.h`, `linux/ioport.h`, `linux/init.h`.
• Detected declarations: `struct i801_mux_config`, `struct i801_priv`, `struct dmi_onboard_device_info`, `function i801_wait_intr`, `function i801_wait_byte_done`, `function i801_get_block_len`, `function i801_check_and_clear_pec_error`, `function i801_check_pre`, `function i801_check_post`, `function i801_transaction`.
• 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.