drivers/hwmon/pmbus/lt7182s.c

Source file repositories/reference/linux-study-clean/drivers/hwmon/pmbus/lt7182s.c

File Facts

System
Linux kernel
Corpus path
drivers/hwmon/pmbus/lt7182s.c
Extension
.c
Size
5119 bytes
Lines
196
Domain
Driver Families
Bucket
drivers/hwmon
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.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0+
/*
 * Hardware monitoring driver for Analog Devices LT7182S
 *
 * Copyright (c) 2022 Guenter Roeck
 *
 */

#include <linux/bits.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include "pmbus.h"

#define LT7182S_NUM_PAGES	2

#define MFR_READ_EXTVCC		0xcd
#define MFR_READ_ITH		0xce
#define MFR_CONFIG_ALL_LT7182S	0xd1
#define MFR_IOUT_PEAK		0xd7
#define MFR_ADC_CONTROL_LT7182S 0xd8

#define MFR_DEBUG_TELEMETRY	BIT(0)

#define MFR_VOUT_PEAK		0xdd
#define MFR_VIN_PEAK		0xde
#define MFR_TEMPERATURE_1_PEAK	0xdf
#define MFR_CLEAR_PEAKS		0xe3

#define MFR_CONFIG_IEEE		BIT(8)

static int lt7182s_read_word_data(struct i2c_client *client, int page, int phase, int reg)
{
	int ret;

	switch (reg) {
	case PMBUS_VIRT_READ_VMON:
		if (page == 0 || page == 1)
			ret = pmbus_read_word_data(client, page, phase, MFR_READ_ITH);
		else
			ret = pmbus_read_word_data(client, 0, phase, MFR_READ_EXTVCC);
		break;
	case PMBUS_VIRT_READ_IOUT_MAX:
		ret = pmbus_read_word_data(client, page, phase, MFR_IOUT_PEAK);
		break;
	case PMBUS_VIRT_READ_VOUT_MAX:
		ret = pmbus_read_word_data(client, page, phase, MFR_VOUT_PEAK);
		break;
	case PMBUS_VIRT_READ_VIN_MAX:
		ret = pmbus_read_word_data(client, page, phase, MFR_VIN_PEAK);
		break;
	case PMBUS_VIRT_READ_TEMP_MAX:
		ret = pmbus_read_word_data(client, page, phase, MFR_TEMPERATURE_1_PEAK);
		break;
	case PMBUS_VIRT_RESET_VIN_HISTORY:
		ret = (page == 0) ? 0 : -ENODATA;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int lt7182s_write_word_data(struct i2c_client *client, int page, int reg, u16 word)
{
	int ret;

	switch (reg) {
	case PMBUS_VIRT_RESET_VIN_HISTORY:
		ret = pmbus_write_byte(client, 0, MFR_CLEAR_PEAKS);
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static struct pmbus_driver_info lt7182s_info = {
	.pages = LT7182S_NUM_PAGES,
	.format[PSC_VOLTAGE_IN] = linear,
	.format[PSC_VOLTAGE_OUT] = linear,
	.format[PSC_CURRENT_IN] = linear,
	.format[PSC_CURRENT_OUT] = linear,
	.format[PSC_TEMPERATURE] = linear,
	.format[PSC_POWER] = linear,

Annotation

Implementation Notes