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
adt7410_regmap_is_volatile(struct device * dev,unsigned int reg)16 static 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
adt7410_reg_read(void * context,unsigned int reg,unsigned int * val)27 static 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
adt7410_reg_write(void * context,unsigned int reg,unsigned int val)49 static 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
68 static 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
adt7410_i2c_probe(struct i2c_client * client)78 static 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
90 static const struct i2c_device_id adt7410_ids[] = {
91 { "adt7410", 0 },
92 { "adt7420", 0 },
93 {}
94 };
95 MODULE_DEVICE_TABLE(i2c, adt7410_ids);
96
97 static 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 = adt7410_i2c_probe,
104 .id_table = adt7410_ids,
105 .address_list = I2C_ADDRS(0x48, 0x49, 0x4a, 0x4b),
106 };
107 module_i2c_driver(adt7410_driver);
108
109 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
110 MODULE_DESCRIPTION("ADT7410/AD7420 driver");
111 MODULE_LICENSE("GPL");
112