1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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> |
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 | |
54 | static int tmp103_read(struct device *dev, enum hwmon_sensor_types type, |
55 | u32 attr, int channel, long *temp) |
56 | { |
57 | struct regmap *regmap = dev_get_drvdata(dev); |
58 | unsigned int regval; |
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 | } |
74 | |
75 | err = regmap_read(map: regmap, reg, val: ®val); |
76 | if (err < 0) |
77 | return err; |
78 | |
79 | *temp = tmp103_reg_to_mc(val: regval); |
80 | |
81 | return 0; |
82 | } |
83 | |
84 | static int tmp103_write(struct device *dev, enum hwmon_sensor_types type, |
85 | u32 attr, int channel, long temp) |
86 | { |
87 | struct regmap *regmap = dev_get_drvdata(dev); |
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 | } |
100 | |
101 | temp = clamp_val(temp, -55000, 127000); |
102 | return regmap_write(map: regmap, reg, val: tmp103_mc_to_reg(val: temp)); |
103 | } |
104 | |
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 | } |
121 | |
122 | static const struct hwmon_channel_info * const tmp103_info[] = { |
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 | }; |
129 | |
130 | static const struct hwmon_ops tmp103_hwmon_ops = { |
131 | .is_visible = tmp103_is_visible, |
132 | .read = tmp103_read, |
133 | .write = tmp103_write, |
134 | }; |
135 | |
136 | static const struct hwmon_chip_info tmp103_chip_info = { |
137 | .ops = &tmp103_hwmon_ops, |
138 | .info = tmp103_info, |
139 | }; |
140 | |
141 | static bool tmp103_regmap_is_volatile(struct device *dev, unsigned int reg) |
142 | { |
143 | return reg == TMP103_TEMP_REG; |
144 | } |
145 | |
146 | static const struct regmap_config tmp103_regmap_config = { |
147 | .reg_bits = 8, |
148 | .val_bits = 8, |
149 | .max_register = TMP103_THIGH_REG, |
150 | .volatile_reg = tmp103_regmap_is_volatile, |
151 | }; |
152 | |
153 | static int tmp103_probe(struct i2c_client *client) |
154 | { |
155 | struct device *dev = &client->dev; |
156 | struct device *hwmon_dev; |
157 | struct regmap *regmap; |
158 | int ret; |
159 | |
160 | regmap = devm_regmap_init_i2c(client, &tmp103_regmap_config); |
161 | if (IS_ERR(ptr: regmap)) { |
162 | dev_err(dev, "failed to allocate register map\n" ); |
163 | return PTR_ERR(ptr: regmap); |
164 | } |
165 | |
166 | ret = regmap_update_bits(map: 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 | |
173 | i2c_set_clientdata(client, data: regmap); |
174 | hwmon_dev = devm_hwmon_device_register_with_info(dev, name: client->name, |
175 | drvdata: regmap, |
176 | info: &tmp103_chip_info, |
177 | NULL); |
178 | return PTR_ERR_OR_ZERO(ptr: hwmon_dev); |
179 | } |
180 | |
181 | static int tmp103_suspend(struct device *dev) |
182 | { |
183 | struct regmap *regmap = dev_get_drvdata(dev); |
184 | |
185 | return regmap_update_bits(map: regmap, TMP103_CONF_REG, |
186 | TMP103_CONF_SD_MASK, val: 0); |
187 | } |
188 | |
189 | static int tmp103_resume(struct device *dev) |
190 | { |
191 | struct regmap *regmap = dev_get_drvdata(dev); |
192 | |
193 | return regmap_update_bits(map: regmap, TMP103_CONF_REG, |
194 | TMP103_CONF_SD_MASK, TMP103_CONF_SD); |
195 | } |
196 | |
197 | static DEFINE_SIMPLE_DEV_PM_OPS(tmp103_dev_pm_ops, tmp103_suspend, tmp103_resume); |
198 | |
199 | static const struct i2c_device_id tmp103_id[] = { |
200 | { "tmp103" , 0 }, |
201 | { } |
202 | }; |
203 | MODULE_DEVICE_TABLE(i2c, tmp103_id); |
204 | |
205 | static const struct of_device_id __maybe_unused tmp103_of_match[] = { |
206 | { .compatible = "ti,tmp103" }, |
207 | { }, |
208 | }; |
209 | MODULE_DEVICE_TABLE(of, tmp103_of_match); |
210 | |
211 | static struct i2c_driver tmp103_driver = { |
212 | .driver = { |
213 | .name = "tmp103" , |
214 | .of_match_table = of_match_ptr(tmp103_of_match), |
215 | .pm = pm_sleep_ptr(&tmp103_dev_pm_ops), |
216 | }, |
217 | .probe = tmp103_probe, |
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" ); |
226 | |