drivers/hwmon/it87.c

File Facts

System

Linux kernel

Corpus path

drivers/hwmon/it87.c

Extension

.c

Size

115228 bytes

Lines

3863

Domain

Driver Families

Bucket

drivers/hwmon

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.
• 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/bitops.h
• linux/module.h
• linux/init.h
• linux/slab.h
• linux/jiffies.h
• linux/platform_device.h
• linux/hwmon.h
• linux/hwmon-sysfs.h
• linux/hwmon-vid.h
• linux/err.h
• linux/mutex.h
• linux/sysfs.h
• linux/string.h
• linux/dmi.h
• linux/acpi.h
• linux/io.h

Detected Declarations

• struct it87_devices
• struct it87_sio_data
• struct it87_data
• struct it87_dmi_data
• enum chips
• function __superio_enter
• function superio_inb
• function superio_outb
• function superio_inw
• function superio_select
• function superio_enter
• function superio_exit
• function adc_lsb
• function in_to_reg
• function in_from_reg
• function FAN_TO_REG
• function FAN16_TO_REG
• function pwm_to_reg
• function pwm_from_reg
• function DIV_TO_REG
• function smbus_disable
• function smbus_enable
• function it87_read_value
• function it87_write_value
• function it87_update_pwm_ctrl
• function it87_lock
• function it87_unlock
• function show_in
• function set_in
• function show_temp
• function set_temp
• function get_temp_type
• function show_temp_type
• function set_temp_type
• function pwm_mode
• function show_fan
• function show_fan_div
• function show_pwm_enable
• function show_pwm
• function show_pwm_freq
• function set_fan
• function set_fan_div
• function check_trip_points
• function set_pwm_enable
• function set_pwm
• function set_pwm_freq
• function show_pwm_temp_map
• function set_pwm_temp_map

Annotated Snippet

module_init(sm_it87_init);
module_exit(sm_it87_exit);

Annotation

• Immediate include surface: `linux/bitops.h`, `linux/module.h`, `linux/init.h`, `linux/slab.h`, `linux/jiffies.h`, `linux/platform_device.h`, `linux/hwmon.h`, `linux/hwmon-sysfs.h`.
• Detected declarations: `struct it87_devices`, `struct it87_sio_data`, `struct it87_data`, `struct it87_dmi_data`, `enum chips`, `function __superio_enter`, `function superio_inb`, `function superio_outb`, `function superio_inw`, `function superio_select`.
• Atlas domain: Driver Families / drivers/hwmon.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

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.