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d17a7dca HS |
1 | /* |
2 | * Texas Instruments TMP103 SMBus temperature sensor driver | |
3 | * Copyright (C) 2014 Heiko Schocher <hs@denx.de> | |
4 | * | |
5 | * Based on: | |
6 | * Texas Instruments TMP102 SMBus temperature sensor driver | |
7 | * | |
8 | * Copyright (C) 2010 Steven King <sfking@fdwdc.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/module.h> | |
23 | #include <linux/init.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/i2c.h> | |
26 | #include <linux/hwmon.h> | |
27 | #include <linux/hwmon-sysfs.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/mutex.h> | |
30 | #include <linux/device.h> | |
31 | #include <linux/jiffies.h> | |
32 | #include <linux/regmap.h> | |
33 | ||
34 | #define TMP103_TEMP_REG 0x00 | |
35 | #define TMP103_CONF_REG 0x01 | |
36 | #define TMP103_TLOW_REG 0x02 | |
37 | #define TMP103_THIGH_REG 0x03 | |
38 | ||
39 | #define TMP103_CONF_M0 0x01 | |
40 | #define TMP103_CONF_M1 0x02 | |
41 | #define TMP103_CONF_LC 0x04 | |
42 | #define TMP103_CONF_FL 0x08 | |
43 | #define TMP103_CONF_FH 0x10 | |
44 | #define TMP103_CONF_CR0 0x20 | |
45 | #define TMP103_CONF_CR1 0x40 | |
46 | #define TMP103_CONF_ID 0x80 | |
47 | #define TMP103_CONF_SD (TMP103_CONF_M1) | |
48 | #define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1) | |
49 | ||
50 | #define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1) | |
51 | #define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \ | |
52 | TMP103_CONF_M0 | TMP103_CONF_M1) | |
53 | ||
54 | static inline int tmp103_reg_to_mc(s8 val) | |
55 | { | |
56 | return val * 1000; | |
57 | } | |
58 | ||
59 | static inline u8 tmp103_mc_to_reg(int val) | |
60 | { | |
61 | return DIV_ROUND_CLOSEST(val, 1000); | |
62 | } | |
63 | ||
69dd7cdb GR |
64 | static ssize_t tmp103_temp_show(struct device *dev, |
65 | struct device_attribute *attr, char *buf) | |
d17a7dca HS |
66 | { |
67 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
68 | struct regmap *regmap = dev_get_drvdata(dev); | |
69 | unsigned int regval; | |
70 | int ret; | |
71 | ||
72 | ret = regmap_read(regmap, sda->index, ®val); | |
73 | if (ret < 0) | |
74 | return ret; | |
75 | ||
76 | return sprintf(buf, "%d\n", tmp103_reg_to_mc(regval)); | |
77 | } | |
78 | ||
69dd7cdb GR |
79 | static ssize_t tmp103_temp_store(struct device *dev, |
80 | struct device_attribute *attr, | |
81 | const char *buf, size_t count) | |
d17a7dca HS |
82 | { |
83 | struct sensor_device_attribute *sda = to_sensor_dev_attr(attr); | |
84 | struct regmap *regmap = dev_get_drvdata(dev); | |
85 | long val; | |
86 | int ret; | |
87 | ||
88 | if (kstrtol(buf, 10, &val) < 0) | |
89 | return -EINVAL; | |
90 | ||
91 | val = clamp_val(val, -55000, 127000); | |
92 | ret = regmap_write(regmap, sda->index, tmp103_mc_to_reg(val)); | |
93 | return ret ? ret : count; | |
94 | } | |
95 | ||
69dd7cdb | 96 | static SENSOR_DEVICE_ATTR_RO(temp1_input, tmp103_temp, TMP103_TEMP_REG); |
d17a7dca | 97 | |
69dd7cdb | 98 | static SENSOR_DEVICE_ATTR_RW(temp1_min, tmp103_temp, TMP103_TLOW_REG); |
d17a7dca | 99 | |
69dd7cdb | 100 | static SENSOR_DEVICE_ATTR_RW(temp1_max, tmp103_temp, TMP103_THIGH_REG); |
d17a7dca HS |
101 | |
102 | static struct attribute *tmp103_attrs[] = { | |
103 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
104 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
105 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
106 | NULL | |
107 | }; | |
108 | ATTRIBUTE_GROUPS(tmp103); | |
109 | ||
110 | static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg) | |
111 | { | |
112 | return reg == TMP103_TEMP_REG; | |
113 | } | |
114 | ||
034b44b4 | 115 | static const struct regmap_config tmp103_regmap_config = { |
d17a7dca HS |
116 | .reg_bits = 8, |
117 | .val_bits = 8, | |
118 | .max_register = TMP103_THIGH_REG, | |
119 | .volatile_reg = tmp103_regmap_is_volatile, | |
120 | }; | |
121 | ||
122 | static int tmp103_probe(struct i2c_client *client, | |
123 | const struct i2c_device_id *id) | |
124 | { | |
125 | struct device *dev = &client->dev; | |
126 | struct device *hwmon_dev; | |
127 | struct regmap *regmap; | |
128 | int ret; | |
129 | ||
d17a7dca HS |
130 | regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config); |
131 | if (IS_ERR(regmap)) { | |
132 | dev_err(dev, "failed to allocate register map\n"); | |
133 | return PTR_ERR(regmap); | |
134 | } | |
135 | ||
136 | ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK, | |
137 | TMP103_CONFIG); | |
138 | if (ret < 0) { | |
139 | dev_err(&client->dev, "error writing config register\n"); | |
140 | return ret; | |
141 | } | |
142 | ||
233adcef | 143 | i2c_set_clientdata(client, regmap); |
4e66cd13 | 144 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, |
d17a7dca HS |
145 | regmap, tmp103_groups); |
146 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
147 | } | |
148 | ||
39c382a3 | 149 | static int __maybe_unused tmp103_suspend(struct device *dev) |
d17a7dca HS |
150 | { |
151 | struct regmap *regmap = dev_get_drvdata(dev); | |
152 | ||
153 | return regmap_update_bits(regmap, TMP103_CONF_REG, | |
154 | TMP103_CONF_SD_MASK, 0); | |
155 | } | |
156 | ||
39c382a3 | 157 | static int __maybe_unused tmp103_resume(struct device *dev) |
d17a7dca HS |
158 | { |
159 | struct regmap *regmap = dev_get_drvdata(dev); | |
160 | ||
161 | return regmap_update_bits(regmap, TMP103_CONF_REG, | |
162 | TMP103_CONF_SD_MASK, TMP103_CONF_SD); | |
163 | } | |
164 | ||
39c382a3 | 165 | static SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume); |
d17a7dca HS |
166 | |
167 | static const struct i2c_device_id tmp103_id[] = { | |
168 | { "tmp103", 0 }, | |
169 | { } | |
170 | }; | |
171 | MODULE_DEVICE_TABLE(i2c, tmp103_id); | |
172 | ||
20894216 | 173 | static const struct of_device_id __maybe_unused tmp103_of_match[] = { |
72fc64c6 JMC |
174 | { .compatible = "ti,tmp103" }, |
175 | { }, | |
176 | }; | |
177 | MODULE_DEVICE_TABLE(of, tmp103_of_match); | |
178 | ||
d17a7dca HS |
179 | static struct i2c_driver tmp103_driver = { |
180 | .driver = { | |
181 | .name = "tmp103", | |
72fc64c6 | 182 | .of_match_table = of_match_ptr(tmp103_of_match), |
39c382a3 | 183 | .pm = &tmp103_dev_pm_ops, |
d17a7dca HS |
184 | }, |
185 | .probe = tmp103_probe, | |
186 | .id_table = tmp103_id, | |
187 | }; | |
188 | ||
189 | module_i2c_driver(tmp103_driver); | |
190 | ||
191 | MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); | |
192 | MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver"); | |
193 | MODULE_LICENSE("GPL"); |