tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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");