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_MAPLE,
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	.driver = {
99		.name	= "adt7410",
100		.pm	= pm_sleep_ptr(&adt7x10_dev_pm_ops),
101	},
102	.probe		= adt7410_i2c_probe,
103	.id_table	= adt7410_ids,
104};
105module_i2c_driver(adt7410_driver);
106
107MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
108MODULE_DESCRIPTION("ADT7410/AD7420 driver");
109MODULE_LICENSE("GPL");
110