xref: /openbmc/linux/drivers/hwmon/adt7410.c (revision 1975d167)
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