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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d17a7dca HS |
2 | /* |
3 | * Texas Instruments TMP103 SMBus temperature sensor driver | |
4 | * Copyright (C) 2014 Heiko Schocher <hs@denx.de> | |
5 | * | |
6 | * Based on: | |
7 | * Texas Instruments TMP102 SMBus temperature sensor driver | |
8 | * | |
9 | * Copyright (C) 2010 Steven King <sfking@fdwdc.com> | |
d17a7dca HS |
10 | */ |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/i2c.h> | |
16 | #include <linux/hwmon.h> | |
17 | #include <linux/hwmon-sysfs.h> | |
18 | #include <linux/err.h> | |
19 | #include <linux/mutex.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/jiffies.h> | |
22 | #include <linux/regmap.h> | |
23 | ||
24 | #define TMP103_TEMP_REG 0x00 | |
25 | #define TMP103_CONF_REG 0x01 | |
26 | #define TMP103_TLOW_REG 0x02 | |
27 | #define TMP103_THIGH_REG 0x03 | |
28 | ||
29 | #define TMP103_CONF_M0 0x01 | |
30 | #define TMP103_CONF_M1 0x02 | |
31 | #define TMP103_CONF_LC 0x04 | |
32 | #define TMP103_CONF_FL 0x08 | |
33 | #define TMP103_CONF_FH 0x10 | |
34 | #define TMP103_CONF_CR0 0x20 | |
35 | #define TMP103_CONF_CR1 0x40 | |
36 | #define TMP103_CONF_ID 0x80 | |
37 | #define TMP103_CONF_SD (TMP103_CONF_M1) | |
38 | #define TMP103_CONF_SD_MASK (TMP103_CONF_M0 | TMP103_CONF_M1) | |
39 | ||
40 | #define TMP103_CONFIG (TMP103_CONF_CR1 | TMP103_CONF_M1) | |
41 | #define TMP103_CONFIG_MASK (TMP103_CONF_CR0 | TMP103_CONF_CR1 | \ | |
42 | TMP103_CONF_M0 | TMP103_CONF_M1) | |
43 | ||
44 | static inline int tmp103_reg_to_mc(s8 val) | |
45 | { | |
46 | return val * 1000; | |
47 | } | |
48 | ||
49 | static inline u8 tmp103_mc_to_reg(int val) | |
50 | { | |
51 | return DIV_ROUND_CLOSEST(val, 1000); | |
52 | } | |
53 | ||
b87783e8 OR |
54 | static int tmp103_read(struct device *dev, enum hwmon_sensor_types type, |
55 | u32 attr, int channel, long *temp) | |
d17a7dca | 56 | { |
d17a7dca HS |
57 | struct regmap *regmap = dev_get_drvdata(dev); |
58 | unsigned int regval; | |
b87783e8 OR |
59 | int err, reg; |
60 | ||
61 | switch (attr) { | |
62 | case hwmon_temp_input: | |
63 | reg = TMP103_TEMP_REG; | |
64 | break; | |
65 | case hwmon_temp_min: | |
66 | reg = TMP103_TLOW_REG; | |
67 | break; | |
68 | case hwmon_temp_max: | |
69 | reg = TMP103_THIGH_REG; | |
70 | break; | |
71 | default: | |
72 | return -EOPNOTSUPP; | |
73 | } | |
d17a7dca | 74 | |
b87783e8 OR |
75 | err = regmap_read(regmap, reg, ®val); |
76 | if (err < 0) | |
77 | return err; | |
78 | ||
79 | *temp = tmp103_reg_to_mc(regval); | |
d17a7dca | 80 | |
b87783e8 | 81 | return 0; |
d17a7dca HS |
82 | } |
83 | ||
b87783e8 OR |
84 | static int tmp103_write(struct device *dev, enum hwmon_sensor_types type, |
85 | u32 attr, int channel, long temp) | |
d17a7dca | 86 | { |
d17a7dca | 87 | struct regmap *regmap = dev_get_drvdata(dev); |
b87783e8 OR |
88 | int reg; |
89 | ||
90 | switch (attr) { | |
91 | case hwmon_temp_min: | |
92 | reg = TMP103_TLOW_REG; | |
93 | break; | |
94 | case hwmon_temp_max: | |
95 | reg = TMP103_THIGH_REG; | |
96 | break; | |
97 | default: | |
98 | return -EOPNOTSUPP; | |
99 | } | |
d17a7dca | 100 | |
b87783e8 OR |
101 | temp = clamp_val(temp, -55000, 127000); |
102 | return regmap_write(regmap, reg, tmp103_mc_to_reg(temp)); | |
d17a7dca HS |
103 | } |
104 | ||
b87783e8 OR |
105 | static umode_t tmp103_is_visible(const void *data, enum hwmon_sensor_types type, |
106 | u32 attr, int channel) | |
107 | { | |
108 | if (type != hwmon_temp) | |
109 | return 0; | |
110 | ||
111 | switch (attr) { | |
112 | case hwmon_temp_input: | |
113 | return 0444; | |
114 | case hwmon_temp_min: | |
115 | case hwmon_temp_max: | |
116 | return 0644; | |
117 | default: | |
118 | return 0; | |
119 | } | |
120 | } | |
d17a7dca | 121 | |
a705bc46 | 122 | static const struct hwmon_channel_info * const tmp103_info[] = { |
b87783e8 OR |
123 | HWMON_CHANNEL_INFO(chip, |
124 | HWMON_C_REGISTER_TZ), | |
125 | HWMON_CHANNEL_INFO(temp, | |
126 | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN), | |
127 | NULL | |
128 | }; | |
d17a7dca | 129 | |
b87783e8 OR |
130 | static const struct hwmon_ops tmp103_hwmon_ops = { |
131 | .is_visible = tmp103_is_visible, | |
132 | .read = tmp103_read, | |
133 | .write = tmp103_write, | |
134 | }; | |
d17a7dca | 135 | |
b87783e8 OR |
136 | static const struct hwmon_chip_info tmp103_chip_info = { |
137 | .ops = &tmp103_hwmon_ops, | |
138 | .info = tmp103_info, | |
d17a7dca | 139 | }; |
d17a7dca HS |
140 | |
141 | static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg) | |
142 | { | |
143 | return reg == TMP103_TEMP_REG; | |
144 | } | |
145 | ||
034b44b4 | 146 | static const struct regmap_config tmp103_regmap_config = { |
d17a7dca HS |
147 | .reg_bits = 8, |
148 | .val_bits = 8, | |
149 | .max_register = TMP103_THIGH_REG, | |
150 | .volatile_reg = tmp103_regmap_is_volatile, | |
151 | }; | |
152 | ||
67487038 | 153 | static int tmp103_probe(struct i2c_client *client) |
d17a7dca HS |
154 | { |
155 | struct device *dev = &client->dev; | |
156 | struct device *hwmon_dev; | |
157 | struct regmap *regmap; | |
158 | int ret; | |
159 | ||
d17a7dca HS |
160 | regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config); |
161 | if (IS_ERR(regmap)) { | |
162 | dev_err(dev, "failed to allocate register map\n"); | |
163 | return PTR_ERR(regmap); | |
164 | } | |
165 | ||
166 | ret = regmap_update_bits(regmap, TMP103_CONF_REG, TMP103_CONFIG_MASK, | |
167 | TMP103_CONFIG); | |
168 | if (ret < 0) { | |
169 | dev_err(&client->dev, "error writing config register\n"); | |
170 | return ret; | |
171 | } | |
172 | ||
233adcef | 173 | i2c_set_clientdata(client, regmap); |
b87783e8 OR |
174 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
175 | regmap, | |
176 | &tmp103_chip_info, | |
177 | NULL); | |
d17a7dca HS |
178 | return PTR_ERR_OR_ZERO(hwmon_dev); |
179 | } | |
180 | ||
a158b4ea | 181 | static int tmp103_suspend(struct device *dev) |
d17a7dca HS |
182 | { |
183 | struct regmap *regmap = dev_get_drvdata(dev); | |
184 | ||
185 | return regmap_update_bits(regmap, TMP103_CONF_REG, | |
186 | TMP103_CONF_SD_MASK, 0); | |
187 | } | |
188 | ||
a158b4ea | 189 | static int tmp103_resume(struct device *dev) |
d17a7dca HS |
190 | { |
191 | struct regmap *regmap = dev_get_drvdata(dev); | |
192 | ||
193 | return regmap_update_bits(regmap, TMP103_CONF_REG, | |
194 | TMP103_CONF_SD_MASK, TMP103_CONF_SD); | |
195 | } | |
196 | ||
a158b4ea | 197 | static DEFINE_SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume); |
d17a7dca HS |
198 | |
199 | static const struct i2c_device_id tmp103_id[] = { | |
200 | { "tmp103", 0 }, | |
201 | { } | |
202 | }; | |
203 | MODULE_DEVICE_TABLE(i2c, tmp103_id); | |
204 | ||
20894216 | 205 | static const struct of_device_id __maybe_unused tmp103_of_match[] = { |
72fc64c6 JMC |
206 | { .compatible = "ti,tmp103" }, |
207 | { }, | |
208 | }; | |
209 | MODULE_DEVICE_TABLE(of, tmp103_of_match); | |
210 | ||
d17a7dca HS |
211 | static struct i2c_driver tmp103_driver = { |
212 | .driver = { | |
213 | .name = "tmp103", | |
72fc64c6 | 214 | .of_match_table = of_match_ptr(tmp103_of_match), |
a158b4ea | 215 | .pm = pm_sleep_ptr(&tmp103_dev_pm_ops), |
d17a7dca | 216 | }, |
1975d167 | 217 | .probe = tmp103_probe, |
d17a7dca HS |
218 | .id_table = tmp103_id, |
219 | }; | |
220 | ||
221 | module_i2c_driver(tmp103_driver); | |
222 | ||
223 | MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); | |
224 | MODULE_DESCRIPTION("Texas Instruments TMP103 temperature sensor driver"); | |
225 | MODULE_LICENSE("GPL"); |