linux/drivers/hwmon/pmbus/max15301.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hardware monitoring driver for Maxim MAX15301
 *
 * Copyright (c) 2021 Flextronics International Sweden AB
 *
 * Even though the specification does not specifically mention it,
 * extensive empirical testing has revealed that auto-detection of
 * limit-registers will fail in a random fashion unless the delay
 * parameter is set to above about 80us. The default delay is set
 * to 100us to include some safety margin.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/ktime.h>
#include <linux/delay.h>
#include <linux/pmbus.h>
#include "pmbus.h"

static const struct i2c_device_id max15301_id[] = …;
MODULE_DEVICE_TABLE(i2c, max15301_id);

struct max15301_data { … };

#define to_max15301_data(x) …

#define MAX15301_WAIT_TIME …

static ushort delay = …;
module_param(delay, ushort, 0644);
MODULE_PARM_DESC(…) …;

static struct max15301_data max15301_data = …;

/* This chip needs a delay between accesses */
static inline void max15301_wait(const struct max15301_data *data)
{ … }

static int max15301_read_word_data(struct i2c_client *client, int page,
				   int phase, int reg)
{ … }

static int max15301_read_byte_data(struct i2c_client *client, int page, int reg)
{ … }

static int max15301_write_word_data(struct i2c_client *client, int page, int reg,
				    u16 word)
{ … }

static int max15301_write_byte(struct i2c_client *client, int page, u8 value)
{ … }

static int max15301_probe(struct i2c_client *client)
{ … }

static struct i2c_driver max15301_driver = …;

module_i2c_driver(…) …;

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;
MODULE_IMPORT_NS(…);