drivers/power/supply/max17040_battery.c

File Facts

System

Linux kernel

Corpus path

drivers/power/supply/max17040_battery.c

Extension

.c

Size

15879 bytes

Lines

642

Domain

Driver Families

Bucket

drivers/power

Inferred role

Driver Families: implementation source

Status

source 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.
• 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/init.h
• linux/platform_device.h
• linux/mutex.h
• linux/err.h
• linux/i2c.h
• linux/delay.h
• linux/interrupt.h
• linux/power_supply.h
• linux/of.h
• linux/regmap.h
• linux/slab.h
• linux/iio/consumer.h

Detected Declarations

• struct chip_data
• struct max17040_chip
• enum chip_id
• function max17040_reset
• function max17040_set_low_soc_alert
• function max17040_set_soc_alert
• function max17040_set_rcomp
• function max17040_raw_vcell_to_uvolts
• function max17040_get_vcell
• function max17040_get_soc
• function max17040_get_version
• function max17040_get_online
• function max17040_get_of_data
• function max17040_check_changes
• function max17040_queue_work
• function max17040_stop_work
• function max17040_work
• function max17040_handle_soc_alert
• function max17040_thread_handler
• function max17040_enable_alert_irq
• function max17040_prop_writeable
• function max17040_set_property
• function max17040_get_property
• function max17040_probe
• function max17040_suspend
• function max17040_resume

Annotated Snippet

struct chip_data {
	u16 reset_val;
	u16 vcell_shift;
	u16 vcell_mul;
	u16 vcell_div;
	u8  has_low_soc_alert;
	u8  rcomp_bytes;
	u8  has_soc_alert;
};

static struct chip_data max17040_family[] = {
	[ID_MAX17040] = {
		.reset_val = 0x0054,
		.vcell_shift = 4,
		.vcell_mul = 1250,
		.vcell_div = 1,
		.has_low_soc_alert = 0,
		.rcomp_bytes = 2,
		.has_soc_alert = 0,
	},
	[ID_MAX17041] = {
		.reset_val = 0x0054,
		.vcell_shift = 4,
		.vcell_mul = 2500,
		.vcell_div = 1,
		.has_low_soc_alert = 0,
		.rcomp_bytes = 2,
		.has_soc_alert = 0,
	},
	[ID_MAX17043] = {
		.reset_val = 0x0054,
		.vcell_shift = 4,
		.vcell_mul = 1250,
		.vcell_div = 1,
		.has_low_soc_alert = 1,
		.rcomp_bytes = 1,
		.has_soc_alert = 0,
	},
	[ID_MAX17044] = {
		.reset_val = 0x0054,
		.vcell_shift = 4,
		.vcell_mul = 2500,
		.vcell_div = 1,
		.has_low_soc_alert = 1,
		.rcomp_bytes = 1,
		.has_soc_alert = 0,
	},
	[ID_MAX17048] = {
		.reset_val = 0x5400,
		.vcell_shift = 0,
		.vcell_mul = 625,
		.vcell_div = 8,
		.has_low_soc_alert = 1,
		.rcomp_bytes = 1,
		.has_soc_alert = 1,
	},
	[ID_MAX17049] = {
		.reset_val = 0x5400,
		.vcell_shift = 0,
		.vcell_mul = 625,
		.vcell_div = 4,
		.has_low_soc_alert = 1,
		.rcomp_bytes = 1,
		.has_soc_alert = 1,
	},
	[ID_MAX17058] = {
		.reset_val = 0x5400,
		.vcell_shift = 0,
		.vcell_mul = 625,
		.vcell_div = 8,
		.has_low_soc_alert = 1,
		.rcomp_bytes = 1,
		.has_soc_alert = 0,
	},
	[ID_MAX17059] = {
		.reset_val = 0x5400,
		.vcell_shift = 0,
		.vcell_mul = 625,
		.vcell_div = 4,
		.has_low_soc_alert = 1,
		.rcomp_bytes = 1,
		.has_soc_alert = 0,
	},
};

struct max17040_chip {
	struct i2c_client		*client;
	struct regmap			*regmap;
	struct delayed_work		work;
	struct power_supply		*battery;

Annotation

• Immediate include surface: `linux/module.h`, `linux/init.h`, `linux/platform_device.h`, `linux/mutex.h`, `linux/err.h`, `linux/i2c.h`, `linux/delay.h`, `linux/interrupt.h`.
• Detected declarations: `struct chip_data`, `struct max17040_chip`, `enum chip_id`, `function max17040_reset`, `function max17040_set_low_soc_alert`, `function max17040_set_soc_alert`, `function max17040_set_rcomp`, `function max17040_raw_vcell_to_uvolts`, `function max17040_get_vcell`, `function max17040_get_soc`.
• Atlas domain: Driver Families / drivers/power.
• Implementation status: source implementation candidate.
• 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.