adt7410.c

  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/mod_devicetable.h>
 11#include <linux/init.h>
 12#include <linux/i2c.h>
 13#include <linux/regmap.h>
 14
 15#include "adt7x10.h"
 16
 17static bool adt7410_regmap_is_volatile(struct device *dev, unsigned int reg)
 18{
 19	switch (reg) {
 20	case ADT7X10_TEMPERATURE:
 21	case ADT7X10_STATUS:
 22		return true;
 23	default:
 24		return false;
 25	}
 26}
 27
 28static int adt7410_reg_read(void *context, unsigned int reg, unsigned int *val)
 29{
 30	struct i2c_client *client = context;
 31	int regval;
 32
 33	switch (reg) {
 34	case ADT7X10_TEMPERATURE:
 35	case ADT7X10_T_ALARM_HIGH:
 36	case ADT7X10_T_ALARM_LOW:
 37	case ADT7X10_T_CRIT:
 38		regval = i2c_smbus_read_word_swapped(client, reg);
 39		break;
 40	default:
 41		regval = i2c_smbus_read_byte_data(client, reg);
 42		break;
 43	}
 44	if (regval < 0)
 45		return regval;
 46	*val = regval;
 47	return 0;
 48}
 49
 50static int adt7410_reg_write(void *context, unsigned int reg, unsigned int val)
 51{
 52	struct i2c_client *client = context;
 53	int ret;
 54
 55	switch (reg) {
 56	case ADT7X10_TEMPERATURE:
 57	case ADT7X10_T_ALARM_HIGH:
 58	case ADT7X10_T_ALARM_LOW:
 59	case ADT7X10_T_CRIT:
 60		ret = i2c_smbus_write_word_swapped(client, reg, val);
 61		break;
 62	default:
 63		ret = i2c_smbus_write_byte_data(client, reg, val);
 64		break;
 65	}
 66	return ret;
 67}
 68
 69static const struct regmap_config adt7410_regmap_config = {
 70	.reg_bits = 8,
 71	.val_bits = 16,
 72	.max_register = ADT7X10_ID,
 73	.cache_type = REGCACHE_MAPLE,
 74	.volatile_reg = adt7410_regmap_is_volatile,
 75	.reg_read = adt7410_reg_read,
 76	.reg_write = adt7410_reg_write,
 77};
 78
 79static int adt7410_i2c_probe(struct i2c_client *client)
 80{
 81	struct regmap *regmap;
 82
 83	regmap = devm_regmap_init(&client->dev, NULL, client,
 84				  &adt7410_regmap_config);
 85	if (IS_ERR(regmap))
 86		return PTR_ERR(regmap);
 87
 88	return adt7x10_probe(&client->dev, client->name, client->irq, regmap);
 89}
 90
 91static const struct i2c_device_id adt7410_ids[] = {
 92	{ "adt7410" },
 93	{ "adt7420" },
 94	{ "adt7422" },
 95	{}
 96};
 97MODULE_DEVICE_TABLE(i2c, adt7410_ids);
 98
 99static const struct of_device_id adt7410_of_match[] = {
100	{ .compatible = "adi,adt7410" },
101	{ .compatible = "adi,adt7420" },
102	{ .compatible = "adi,adt7422" },
103	{ }
104};
105MODULE_DEVICE_TABLE(of, adt7410_of_match);
106
107static struct i2c_driver adt7410_driver = {
108	.driver = {
109		.name	= "adt7410",
110		.pm	= pm_sleep_ptr(&adt7x10_dev_pm_ops),
111		.of_match_table = adt7410_of_match,
112	},
113	.probe		= adt7410_i2c_probe,
114	.id_table	= adt7410_ids,
115};
116module_i2c_driver(adt7410_driver);
117
118MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
119MODULE_DESCRIPTION("ADT7410/AD7420 driver");
120MODULE_LICENSE("GPL");