1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * ADT7410/ADT7420 digital temperature sensor driver
  4 *
  5 * Copyright 2012-2013 Analog Devices Inc.
  6 *   Author: Lars-Peter Clausen <lars@metafoo.de>
  7 */
  8
  9#include <linux/module.h>
 10#include <linux/init.h>
 11#include <linux/i2c.h>
 12#include <linux/regmap.h>
 13
 14#include "adt7x10.h"
 15
 16static bool adt7410_regmap_is_volatile(struct device *dev, unsigned int reg)
 17{
 18	switch (reg) {
 19	case ADT7X10_TEMPERATURE:
 20	case ADT7X10_STATUS:
 21		return true;
 22	default:
 23		return false;
 24	}
 25}
 26
 27static int adt7410_reg_read(void *context, unsigned int reg, unsigned int *val)
 28{
 29	struct i2c_client *client = context;
 30	int regval;
 31
 32	switch (reg) {
 33	case ADT7X10_TEMPERATURE:
 34	case ADT7X10_T_ALARM_HIGH:
 35	case ADT7X10_T_ALARM_LOW:
 36	case ADT7X10_T_CRIT:
 37		regval = i2c_smbus_read_word_swapped(client, reg);
 38		break;
 39	default:
 40		regval = i2c_smbus_read_byte_data(client, reg);
 41		break;
 42	}
 43	if (regval < 0)
 44		return regval;
 45	*val = regval;
 46	return 0;
 47}
 48
 49static int adt7410_reg_write(void *context, unsigned int reg, unsigned int val)
 50{
 51	struct i2c_client *client = context;
 52	int ret;
 53
 54	switch (reg) {
 55	case ADT7X10_TEMPERATURE:
 56	case ADT7X10_T_ALARM_HIGH:
 57	case ADT7X10_T_ALARM_LOW:
 58	case ADT7X10_T_CRIT:
 59		ret = i2c_smbus_write_word_swapped(client, reg, val);
 60		break;
 61	default:
 62		ret = i2c_smbus_write_byte_data(client, reg, val);
 63		break;
 64	}
 65	return ret;
 66}
 67
 68static const struct regmap_config adt7410_regmap_config = {
 69	.reg_bits = 8,
 70	.val_bits = 16,
 71	.max_register = ADT7X10_ID,
 72	.cache_type = REGCACHE_RBTREE,
 73	.volatile_reg = adt7410_regmap_is_volatile,
 74	.reg_read = adt7410_reg_read,
 75	.reg_write = adt7410_reg_write,
 76};
 77
 78static int adt7410_i2c_probe(struct i2c_client *client)
 79{
 80	struct regmap *regmap;
 81
 82	regmap = devm_regmap_init(&client->dev, NULL, client,
 83				  &adt7410_regmap_config);
 84	if (IS_ERR(regmap))
 85		return PTR_ERR(regmap);
 86
 87	return adt7x10_probe(&client->dev, client->name, client->irq, regmap);
 88}
 89
 90static const struct i2c_device_id adt7410_ids[] = {
 91	{ "adt7410", 0 },
 92	{ "adt7420", 0 },
 93	{}
 94};
 95MODULE_DEVICE_TABLE(i2c, adt7410_ids);
 96
 97static struct i2c_driver adt7410_driver = {
 98	.class		= I2C_CLASS_HWMON,
 99	.driver = {
100		.name	= "adt7410",
101		.pm	= pm_sleep_ptr(&adt7x10_dev_pm_ops),
102	},
103	.probe_new	= adt7410_i2c_probe,
104	.id_table	= adt7410_ids,
105	.address_list	= I2C_ADDRS(0x48, 0x49, 0x4a, 0x4b),
106};
107module_i2c_driver(adt7410_driver);
108
109MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
110MODULE_DESCRIPTION("ADT7410/AD7420 driver");
111MODULE_LICENSE("GPL");