drivers/hwmon/pmbus/max8688.c

Source file repositories/reference/linux-study-clean/drivers/hwmon/pmbus/max8688.c

File Facts

System
Linux kernel
Corpus path
drivers/hwmon/pmbus/max8688.c
Extension
.c
Size
4894 bytes
Lines
195
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-or-later
/*
 * Hardware monitoring driver for Maxim MAX8688
 *
 * Copyright (c) 2011 Ericsson AB.
 */

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

#define MAX8688_MFR_VOUT_PEAK		0xd4
#define MAX8688_MFR_IOUT_PEAK		0xd5
#define MAX8688_MFR_TEMPERATURE_PEAK	0xd6
#define MAX8688_MFG_STATUS		0xd8

#define MAX8688_STATUS_OC_FAULT		BIT(4)
#define MAX8688_STATUS_OV_FAULT		BIT(5)
#define MAX8688_STATUS_OV_WARNING	BIT(8)
#define MAX8688_STATUS_UV_FAULT		BIT(9)
#define MAX8688_STATUS_UV_WARNING	BIT(10)
#define MAX8688_STATUS_UC_FAULT		BIT(11)
#define MAX8688_STATUS_OC_WARNING	BIT(12)
#define MAX8688_STATUS_OT_FAULT		BIT(13)
#define MAX8688_STATUS_OT_WARNING	BIT(14)

static int max8688_read_word_data(struct i2c_client *client, int page,
				  int phase, int reg)
{
	int ret;

	if (page > 0)
		return -ENXIO;

	switch (reg) {
	case PMBUS_VIRT_READ_VOUT_MAX:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   MAX8688_MFR_VOUT_PEAK);
		break;
	case PMBUS_VIRT_READ_IOUT_MAX:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   MAX8688_MFR_IOUT_PEAK);
		break;
	case PMBUS_VIRT_READ_TEMP_MAX:
		ret = pmbus_read_word_data(client, 0, 0xff,
					   MAX8688_MFR_TEMPERATURE_PEAK);
		break;
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
	case PMBUS_VIRT_RESET_TEMP_HISTORY:
		ret = 0;
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int max8688_write_word_data(struct i2c_client *client, int page, int reg,
				   u16 word)
{
	int ret;

	switch (reg) {
	case PMBUS_VIRT_RESET_VOUT_HISTORY:
		ret = pmbus_write_word_data(client, 0, MAX8688_MFR_VOUT_PEAK,
					    0);
		break;
	case PMBUS_VIRT_RESET_IOUT_HISTORY:
		ret = pmbus_write_word_data(client, 0, MAX8688_MFR_IOUT_PEAK,
					    0);
		break;
	case PMBUS_VIRT_RESET_TEMP_HISTORY:
		ret = pmbus_write_word_data(client, 0,
					    MAX8688_MFR_TEMPERATURE_PEAK,
					    0xffff);
		break;
	default:
		ret = -ENODATA;
		break;
	}
	return ret;
}

static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)

Annotation

Implementation Notes