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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
9410700b AP |
2 | /* tmp421.c |
3 | * | |
4 | * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de> | |
5 | * Preliminary support by: | |
6 | * Melvin Rook, Raymond Ng | |
9410700b AP |
7 | */ |
8 | ||
9 | /* | |
10 | * Driver for the Texas Instruments TMP421 SMBus temperature sensor IC. | |
05c77ab2 | 11 | * Supported models: TMP421, TMP422, TMP423, TMP441, TMP442 |
9410700b AP |
12 | */ |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/slab.h> | |
17 | #include <linux/jiffies.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/hwmon.h> | |
20 | #include <linux/hwmon-sysfs.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/mutex.h> | |
a1253027 | 23 | #include <linux/of_device.h> |
9410700b AP |
24 | #include <linux/sysfs.h> |
25 | ||
26 | /* Addresses to scan */ | |
918ee91c JD |
27 | static const unsigned short normal_i2c[] = { 0x2a, 0x4c, 0x4d, 0x4e, 0x4f, |
28 | I2C_CLIENT_END }; | |
9410700b | 29 | |
05c77ab2 | 30 | enum chips { tmp421, tmp422, tmp423, tmp441, tmp442 }; |
9410700b AP |
31 | |
32 | /* The TMP421 registers */ | |
a63ee9d8 | 33 | #define TMP421_STATUS_REG 0x08 |
9410700b AP |
34 | #define TMP421_CONFIG_REG_1 0x09 |
35 | #define TMP421_CONVERSION_RATE_REG 0x0B | |
36 | #define TMP421_MANUFACTURER_ID_REG 0xFE | |
37 | #define TMP421_DEVICE_ID_REG 0xFF | |
38 | ||
39 | static const u8 TMP421_TEMP_MSB[4] = { 0x00, 0x01, 0x02, 0x03 }; | |
40 | static const u8 TMP421_TEMP_LSB[4] = { 0x10, 0x11, 0x12, 0x13 }; | |
41 | ||
42 | /* Flags */ | |
43 | #define TMP421_CONFIG_SHUTDOWN 0x40 | |
44 | #define TMP421_CONFIG_RANGE 0x04 | |
45 | ||
46 | /* Manufacturer / Device ID's */ | |
47 | #define TMP421_MANUFACTURER_ID 0x55 | |
48 | #define TMP421_DEVICE_ID 0x21 | |
49 | #define TMP422_DEVICE_ID 0x22 | |
50 | #define TMP423_DEVICE_ID 0x23 | |
05c77ab2 GR |
51 | #define TMP441_DEVICE_ID 0x41 |
52 | #define TMP442_DEVICE_ID 0x42 | |
9410700b AP |
53 | |
54 | static const struct i2c_device_id tmp421_id[] = { | |
8d59582a JD |
55 | { "tmp421", 2 }, |
56 | { "tmp422", 3 }, | |
57 | { "tmp423", 4 }, | |
05c77ab2 GR |
58 | { "tmp441", 2 }, |
59 | { "tmp442", 3 }, | |
9410700b AP |
60 | { } |
61 | }; | |
62 | MODULE_DEVICE_TABLE(i2c, tmp421_id); | |
63 | ||
bd7d56a7 | 64 | static const struct of_device_id __maybe_unused tmp421_of_match[] = { |
a1253027 JMC |
65 | { |
66 | .compatible = "ti,tmp421", | |
67 | .data = (void *)2 | |
68 | }, | |
69 | { | |
70 | .compatible = "ti,tmp422", | |
71 | .data = (void *)3 | |
72 | }, | |
73 | { | |
74 | .compatible = "ti,tmp423", | |
75 | .data = (void *)4 | |
76 | }, | |
77 | { | |
78 | .compatible = "ti,tmp441", | |
79 | .data = (void *)2 | |
80 | }, | |
81 | { | |
f422449b | 82 | .compatible = "ti,tmp442", |
a1253027 JMC |
83 | .data = (void *)3 |
84 | }, | |
85 | { }, | |
86 | }; | |
87 | MODULE_DEVICE_TABLE(of, tmp421_of_match); | |
88 | ||
9410700b | 89 | struct tmp421_data { |
276dac80 | 90 | struct i2c_client *client; |
9410700b | 91 | struct mutex update_lock; |
bb43cc45 GR |
92 | u32 temp_config[5]; |
93 | struct hwmon_channel_info temp_info; | |
94 | const struct hwmon_channel_info *info[2]; | |
95 | struct hwmon_chip_info chip; | |
9410700b AP |
96 | char valid; |
97 | unsigned long last_updated; | |
a1253027 | 98 | unsigned long channels; |
9410700b AP |
99 | u8 config; |
100 | s16 temp[4]; | |
101 | }; | |
102 | ||
103 | static int temp_from_s16(s16 reg) | |
104 | { | |
a44908d7 JD |
105 | /* Mask out status bits */ |
106 | int temp = reg & ~0xf; | |
9410700b AP |
107 | |
108 | return (temp * 1000 + 128) / 256; | |
109 | } | |
110 | ||
111 | static int temp_from_u16(u16 reg) | |
112 | { | |
a44908d7 JD |
113 | /* Mask out status bits */ |
114 | int temp = reg & ~0xf; | |
9410700b AP |
115 | |
116 | /* Add offset for extended temperature range. */ | |
117 | temp -= 64 * 256; | |
118 | ||
119 | return (temp * 1000 + 128) / 256; | |
120 | } | |
121 | ||
122 | static struct tmp421_data *tmp421_update_device(struct device *dev) | |
123 | { | |
276dac80 GR |
124 | struct tmp421_data *data = dev_get_drvdata(dev); |
125 | struct i2c_client *client = data->client; | |
9410700b AP |
126 | int i; |
127 | ||
128 | mutex_lock(&data->update_lock); | |
129 | ||
130 | if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) { | |
131 | data->config = i2c_smbus_read_byte_data(client, | |
132 | TMP421_CONFIG_REG_1); | |
133 | ||
8d59582a | 134 | for (i = 0; i < data->channels; i++) { |
9410700b AP |
135 | data->temp[i] = i2c_smbus_read_byte_data(client, |
136 | TMP421_TEMP_MSB[i]) << 8; | |
137 | data->temp[i] |= i2c_smbus_read_byte_data(client, | |
138 | TMP421_TEMP_LSB[i]); | |
139 | } | |
140 | data->last_updated = jiffies; | |
141 | data->valid = 1; | |
142 | } | |
143 | ||
144 | mutex_unlock(&data->update_lock); | |
145 | ||
146 | return data; | |
147 | } | |
148 | ||
bb43cc45 GR |
149 | static int tmp421_read(struct device *dev, enum hwmon_sensor_types type, |
150 | u32 attr, int channel, long *val) | |
9410700b | 151 | { |
bb43cc45 GR |
152 | struct tmp421_data *tmp421 = tmp421_update_device(dev); |
153 | ||
154 | switch (attr) { | |
155 | case hwmon_temp_input: | |
156 | if (tmp421->config & TMP421_CONFIG_RANGE) | |
157 | *val = temp_from_u16(tmp421->temp[channel]); | |
158 | else | |
159 | *val = temp_from_s16(tmp421->temp[channel]); | |
160 | return 0; | |
161 | case hwmon_temp_fault: | |
162 | /* | |
163 | * The OPEN bit signals a fault. This is bit 0 of the temperature | |
164 | * register (low byte). | |
165 | */ | |
166 | *val = tmp421->temp[channel] & 0x01; | |
167 | return 0; | |
168 | default: | |
169 | return -EOPNOTSUPP; | |
170 | } | |
9410700b | 171 | |
9410700b AP |
172 | } |
173 | ||
bb43cc45 GR |
174 | static umode_t tmp421_is_visible(const void *data, enum hwmon_sensor_types type, |
175 | u32 attr, int channel) | |
9410700b | 176 | { |
bb43cc45 GR |
177 | switch (attr) { |
178 | case hwmon_temp_fault: | |
179 | if (channel == 0) | |
180 | return 0; | |
b626eb22 | 181 | return 0444; |
bb43cc45 | 182 | case hwmon_temp_input: |
b626eb22 | 183 | return 0444; |
bb43cc45 GR |
184 | default: |
185 | return 0; | |
186 | } | |
9410700b AP |
187 | } |
188 | ||
9410700b AP |
189 | static int tmp421_init_client(struct i2c_client *client) |
190 | { | |
191 | int config, config_orig; | |
192 | ||
193 | /* Set the conversion rate to 2 Hz */ | |
194 | i2c_smbus_write_byte_data(client, TMP421_CONVERSION_RATE_REG, 0x05); | |
195 | ||
196 | /* Start conversions (disable shutdown if necessary) */ | |
197 | config = i2c_smbus_read_byte_data(client, TMP421_CONFIG_REG_1); | |
198 | if (config < 0) { | |
b55f3757 GR |
199 | dev_err(&client->dev, |
200 | "Could not read configuration register (%d)\n", config); | |
010a166a | 201 | return config; |
9410700b AP |
202 | } |
203 | ||
204 | config_orig = config; | |
205 | config &= ~TMP421_CONFIG_SHUTDOWN; | |
206 | ||
207 | if (config != config_orig) { | |
208 | dev_info(&client->dev, "Enable monitoring chip\n"); | |
209 | i2c_smbus_write_byte_data(client, TMP421_CONFIG_REG_1, config); | |
210 | } | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
310ec792 | 215 | static int tmp421_detect(struct i2c_client *client, |
9410700b AP |
216 | struct i2c_board_info *info) |
217 | { | |
dbe73c8f | 218 | enum chips kind; |
9410700b | 219 | struct i2c_adapter *adapter = client->adapter; |
8b9bf554 CIK |
220 | static const char * const names[] = { |
221 | "TMP421", "TMP422", "TMP423", | |
222 | "TMP441", "TMP442" | |
223 | }; | |
a63ee9d8 | 224 | int addr = client->addr; |
dbe73c8f | 225 | u8 reg; |
9410700b AP |
226 | |
227 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
228 | return -ENODEV; | |
229 | ||
dbe73c8f JD |
230 | reg = i2c_smbus_read_byte_data(client, TMP421_MANUFACTURER_ID_REG); |
231 | if (reg != TMP421_MANUFACTURER_ID) | |
232 | return -ENODEV; | |
233 | ||
a63ee9d8 GR |
234 | reg = i2c_smbus_read_byte_data(client, TMP421_CONVERSION_RATE_REG); |
235 | if (reg & 0xf8) | |
236 | return -ENODEV; | |
237 | ||
238 | reg = i2c_smbus_read_byte_data(client, TMP421_STATUS_REG); | |
239 | if (reg & 0x7f) | |
240 | return -ENODEV; | |
241 | ||
dbe73c8f JD |
242 | reg = i2c_smbus_read_byte_data(client, TMP421_DEVICE_ID_REG); |
243 | switch (reg) { | |
244 | case TMP421_DEVICE_ID: | |
245 | kind = tmp421; | |
246 | break; | |
247 | case TMP422_DEVICE_ID: | |
a63ee9d8 GR |
248 | if (addr == 0x2a) |
249 | return -ENODEV; | |
dbe73c8f JD |
250 | kind = tmp422; |
251 | break; | |
252 | case TMP423_DEVICE_ID: | |
a63ee9d8 GR |
253 | if (addr != 0x4c && addr != 0x4d) |
254 | return -ENODEV; | |
dbe73c8f JD |
255 | kind = tmp423; |
256 | break; | |
05c77ab2 GR |
257 | case TMP441_DEVICE_ID: |
258 | kind = tmp441; | |
259 | break; | |
260 | case TMP442_DEVICE_ID: | |
261 | if (addr != 0x4c && addr != 0x4d) | |
262 | return -ENODEV; | |
263 | kind = tmp442; | |
264 | break; | |
dbe73c8f JD |
265 | default: |
266 | return -ENODEV; | |
9410700b | 267 | } |
dbe73c8f | 268 | |
dc71afe5 | 269 | strlcpy(info->type, tmp421_id[kind].name, I2C_NAME_SIZE); |
9410700b | 270 | dev_info(&adapter->dev, "Detected TI %s chip at 0x%02x\n", |
dc71afe5 | 271 | names[kind], client->addr); |
9410700b AP |
272 | |
273 | return 0; | |
274 | } | |
275 | ||
bb43cc45 GR |
276 | static const struct hwmon_ops tmp421_ops = { |
277 | .is_visible = tmp421_is_visible, | |
278 | .read = tmp421_read, | |
279 | }; | |
280 | ||
9410700b AP |
281 | static int tmp421_probe(struct i2c_client *client, |
282 | const struct i2c_device_id *id) | |
283 | { | |
276dac80 GR |
284 | struct device *dev = &client->dev; |
285 | struct device *hwmon_dev; | |
9410700b | 286 | struct tmp421_data *data; |
bb43cc45 | 287 | int i, err; |
9410700b | 288 | |
276dac80 | 289 | data = devm_kzalloc(dev, sizeof(struct tmp421_data), GFP_KERNEL); |
9410700b AP |
290 | if (!data) |
291 | return -ENOMEM; | |
292 | ||
9410700b | 293 | mutex_init(&data->update_lock); |
a1253027 JMC |
294 | if (client->dev.of_node) |
295 | data->channels = (unsigned long) | |
296 | of_device_get_match_data(&client->dev); | |
297 | else | |
298 | data->channels = id->driver_data; | |
276dac80 | 299 | data->client = client; |
9410700b AP |
300 | |
301 | err = tmp421_init_client(client); | |
302 | if (err) | |
f625e0fd | 303 | return err; |
9410700b | 304 | |
bb43cc45 GR |
305 | for (i = 0; i < data->channels; i++) |
306 | data->temp_config[i] = HWMON_T_INPUT | HWMON_T_FAULT; | |
307 | ||
308 | data->chip.ops = &tmp421_ops; | |
309 | data->chip.info = data->info; | |
310 | ||
311 | data->info[0] = &data->temp_info; | |
312 | ||
313 | data->temp_info.type = hwmon_temp; | |
314 | data->temp_info.config = data->temp_config; | |
315 | ||
316 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, | |
317 | data, | |
318 | &data->chip, | |
319 | NULL); | |
276dac80 | 320 | return PTR_ERR_OR_ZERO(hwmon_dev); |
9410700b AP |
321 | } |
322 | ||
323 | static struct i2c_driver tmp421_driver = { | |
324 | .class = I2C_CLASS_HWMON, | |
325 | .driver = { | |
326 | .name = "tmp421", | |
a1253027 | 327 | .of_match_table = of_match_ptr(tmp421_of_match), |
9410700b AP |
328 | }, |
329 | .probe = tmp421_probe, | |
9410700b AP |
330 | .id_table = tmp421_id, |
331 | .detect = tmp421_detect, | |
c3813d6a | 332 | .address_list = normal_i2c, |
9410700b AP |
333 | }; |
334 | ||
f0967eea | 335 | module_i2c_driver(tmp421_driver); |
9410700b AP |
336 | |
337 | MODULE_AUTHOR("Andre Prendel <andre.prendel@gmx.de>"); | |
05c77ab2 | 338 | MODULE_DESCRIPTION("Texas Instruments TMP421/422/423/441/442 temperature sensor driver"); |
9410700b | 339 | MODULE_LICENSE("GPL"); |