Commit | Line | Data |
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74ba9207 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
caaa0f36 S |
3 | * lm75.c - Part of lm_sensors, Linux kernel modules for hardware |
4 | * monitoring | |
5 | * Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> | |
caaa0f36 | 6 | */ |
1da177e4 | 7 | |
1da177e4 LT |
8 | #include <linux/module.h> |
9 | #include <linux/init.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/jiffies.h> | |
12 | #include <linux/i2c.h> | |
943b0830 | 13 | #include <linux/hwmon.h> |
9ca8e40c | 14 | #include <linux/hwmon-sysfs.h> |
943b0830 | 15 | #include <linux/err.h> |
e97a45f1 | 16 | #include <linux/of_device.h> |
22e73183 | 17 | #include <linux/of.h> |
e65365fe | 18 | #include <linux/regmap.h> |
4b5be3c1 | 19 | #include <linux/util_macros.h> |
707d151b | 20 | #include <linux/regulator/consumer.h> |
1da177e4 LT |
21 | #include "lm75.h" |
22 | ||
01a52397 DB |
23 | /* |
24 | * This driver handles the LM75 and compatible digital temperature sensors. | |
01a52397 DB |
25 | */ |
26 | ||
9ebd3d82 | 27 | enum lm75_type { /* keep sorted in alphabetical order */ |
e96f9d89 | 28 | adt75, |
c851b715 | 29 | at30ts74, |
1f86df49 | 30 | ds1775, |
9ebd3d82 | 31 | ds75, |
3fbc81e3 | 32 | ds7505, |
c98d6c65 | 33 | g751, |
1f86df49 | 34 | lm75, |
9ebd3d82 | 35 | lm75a, |
799fc602 | 36 | lm75b, |
9ebd3d82 DB |
37 | max6625, |
38 | max6626, | |
a54ca77a | 39 | max31725, |
9ebd3d82 | 40 | mcp980x, |
557c7ffa | 41 | pct2075, |
9ebd3d82 | 42 | stds75, |
2e9a41bb | 43 | stlm75, |
9ebd3d82 DB |
44 | tcn75, |
45 | tmp100, | |
46 | tmp101, | |
6d034059 | 47 | tmp105, |
c83959f8 | 48 | tmp112, |
9ebd3d82 DB |
49 | tmp175, |
50 | tmp275, | |
51 | tmp75, | |
39abe9d8 | 52 | tmp75b, |
9c32e815 | 53 | tmp75c, |
ec081f91 | 54 | tmp1075, |
9ebd3d82 DB |
55 | }; |
56 | ||
dcb12653 IPPS |
57 | /** |
58 | * struct lm75_params - lm75 configuration parameters. | |
59 | * @set_mask: Bits to set in configuration register when configuring | |
60 | * the chip. | |
61 | * @clr_mask: Bits to clear in configuration register when configuring | |
62 | * the chip. | |
63 | * @default_resolution: Default number of bits to represent the temperature | |
64 | * value. | |
65 | * @resolution_limits: Limit register resolution. Optional. Should be set if | |
66 | * the resolution of limit registers does not match the | |
67 | * resolution of the temperature register. | |
7f1a300f IPPS |
68 | * @resolutions: List of resolutions associated with sample times. |
69 | * Optional. Should be set if num_sample_times is larger | |
70 | * than 1, and if the resolution changes with sample times. | |
71 | * If set, number of entries must match num_sample_times. | |
72 | * @default_sample_time:Sample time to be set by default. | |
73 | * @num_sample_times: Number of possible sample times to be set. Optional. | |
74 | * Should be set if the number of sample times is larger | |
75 | * than one. | |
76 | * @sample_times: All the possible sample times to be set. Mandatory if | |
77 | * num_sample_times is larger than 1. If set, number of | |
78 | * entries must match num_sample_times. | |
dcb12653 IPPS |
79 | */ |
80 | ||
81 | struct lm75_params { | |
7f1a300f IPPS |
82 | u8 set_mask; |
83 | u8 clr_mask; | |
84 | u8 default_resolution; | |
85 | u8 resolution_limits; | |
86 | const u8 *resolutions; | |
87 | unsigned int default_sample_time; | |
88 | u8 num_sample_times; | |
89 | const unsigned int *sample_times; | |
dcb12653 IPPS |
90 | }; |
91 | ||
8ff69eeb | 92 | /* Addresses scanned */ |
25e9c86d | 93 | static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c, |
1da177e4 | 94 | 0x4d, 0x4e, 0x4f, I2C_CLIENT_END }; |
1da177e4 | 95 | |
1da177e4 | 96 | /* The LM75 registers */ |
e65365fe | 97 | #define LM75_REG_TEMP 0x00 |
1da177e4 | 98 | #define LM75_REG_CONF 0x01 |
e65365fe GR |
99 | #define LM75_REG_HYST 0x02 |
100 | #define LM75_REG_MAX 0x03 | |
d7a85cde | 101 | #define PCT2075_REG_IDLE 0x04 |
1da177e4 LT |
102 | |
103 | /* Each client has this additional data */ | |
104 | struct lm75_data { | |
dcb12653 IPPS |
105 | struct i2c_client *client; |
106 | struct regmap *regmap; | |
707d151b | 107 | struct regulator *vs; |
dcb12653 IPPS |
108 | u8 orig_conf; |
109 | u8 current_conf; | |
110 | u8 resolution; /* In bits, 9 to 16 */ | |
111 | unsigned int sample_time; /* In ms */ | |
112 | enum lm75_type kind; | |
113 | const struct lm75_params *params; | |
1da177e4 LT |
114 | }; |
115 | ||
01a52397 | 116 | /*-----------------------------------------------------------------------*/ |
7db0db3f GR |
117 | |
118 | static const u8 lm75_sample_set_masks[] = { 0 << 5, 1 << 5, 2 << 5, 3 << 5 }; | |
119 | ||
120 | #define LM75_SAMPLE_CLEAR_MASK (3 << 5) | |
121 | ||
dcb12653 IPPS |
122 | /* The structure below stores the configuration values of the supported devices. |
123 | * In case of being supported multiple configurations, the default one must | |
124 | * always be the first element of the array | |
125 | */ | |
126 | static const struct lm75_params device_params[] = { | |
127 | [adt75] = { | |
128 | .clr_mask = 1 << 5, /* not one-shot mode */ | |
129 | .default_resolution = 12, | |
35cd1804 | 130 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 | 131 | }, |
c851b715 PR |
132 | [at30ts74] = { |
133 | .set_mask = 3 << 5, /* 12-bit mode*/ | |
134 | .default_resolution = 12, | |
135 | .default_sample_time = 200, | |
136 | .num_sample_times = 4, | |
137 | .sample_times = (unsigned int []){ 25, 50, 100, 200 }, | |
138 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
139 | }, | |
dcb12653 IPPS |
140 | [ds1775] = { |
141 | .clr_mask = 3 << 5, | |
142 | .set_mask = 2 << 5, /* 11-bit mode */ | |
143 | .default_resolution = 11, | |
35cd1804 | 144 | .default_sample_time = 500, |
7db0db3f | 145 | .num_sample_times = 4, |
35cd1804 | 146 | .sample_times = (unsigned int []){ 125, 250, 500, 1000 }, |
7db0db3f | 147 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
148 | }, |
149 | [ds75] = { | |
150 | .clr_mask = 3 << 5, | |
151 | .set_mask = 2 << 5, /* 11-bit mode */ | |
152 | .default_resolution = 11, | |
7db0db3f GR |
153 | .default_sample_time = 600, |
154 | .num_sample_times = 4, | |
155 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, | |
156 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
157 | }, |
158 | [stds75] = { | |
159 | .clr_mask = 3 << 5, | |
160 | .set_mask = 2 << 5, /* 11-bit mode */ | |
161 | .default_resolution = 11, | |
7db0db3f GR |
162 | .default_sample_time = 600, |
163 | .num_sample_times = 4, | |
164 | .sample_times = (unsigned int []){ 150, 300, 600, 1200 }, | |
165 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
166 | }, |
167 | [stlm75] = { | |
168 | .default_resolution = 9, | |
35cd1804 | 169 | .default_sample_time = MSEC_PER_SEC / 6, |
dcb12653 IPPS |
170 | }, |
171 | [ds7505] = { | |
172 | .set_mask = 3 << 5, /* 12-bit mode*/ | |
173 | .default_resolution = 12, | |
7db0db3f GR |
174 | .default_sample_time = 200, |
175 | .num_sample_times = 4, | |
176 | .sample_times = (unsigned int []){ 25, 50, 100, 200 }, | |
177 | .resolutions = (u8 []) {9, 10, 11, 12 }, | |
dcb12653 IPPS |
178 | }, |
179 | [g751] = { | |
180 | .default_resolution = 9, | |
35cd1804 | 181 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 IPPS |
182 | }, |
183 | [lm75] = { | |
184 | .default_resolution = 9, | |
35cd1804 | 185 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 IPPS |
186 | }, |
187 | [lm75a] = { | |
188 | .default_resolution = 9, | |
35cd1804 | 189 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 IPPS |
190 | }, |
191 | [lm75b] = { | |
192 | .default_resolution = 11, | |
35cd1804 | 193 | .default_sample_time = MSEC_PER_SEC / 10, |
dcb12653 IPPS |
194 | }, |
195 | [max6625] = { | |
196 | .default_resolution = 9, | |
35cd1804 | 197 | .default_sample_time = MSEC_PER_SEC / 7, |
dcb12653 IPPS |
198 | }, |
199 | [max6626] = { | |
200 | .default_resolution = 12, | |
35cd1804 | 201 | .default_sample_time = MSEC_PER_SEC / 7, |
dcb12653 IPPS |
202 | .resolution_limits = 9, |
203 | }, | |
204 | [max31725] = { | |
205 | .default_resolution = 16, | |
35cd1804 | 206 | .default_sample_time = MSEC_PER_SEC / 20, |
dcb12653 IPPS |
207 | }, |
208 | [tcn75] = { | |
209 | .default_resolution = 9, | |
35cd1804 | 210 | .default_sample_time = MSEC_PER_SEC / 18, |
dcb12653 IPPS |
211 | }, |
212 | [pct2075] = { | |
213 | .default_resolution = 11, | |
214 | .default_sample_time = MSEC_PER_SEC / 10, | |
d7a85cde GR |
215 | .num_sample_times = 31, |
216 | .sample_times = (unsigned int []){ 100, 200, 300, 400, 500, 600, | |
217 | 700, 800, 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, | |
218 | 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, | |
219 | 2800, 2900, 3000, 3100 }, | |
dcb12653 IPPS |
220 | }, |
221 | [mcp980x] = { | |
222 | .set_mask = 3 << 5, /* 12-bit mode */ | |
223 | .clr_mask = 1 << 7, /* not one-shot mode */ | |
224 | .default_resolution = 12, | |
225 | .resolution_limits = 9, | |
7db0db3f GR |
226 | .default_sample_time = 240, |
227 | .num_sample_times = 4, | |
35cd1804 | 228 | .sample_times = (unsigned int []){ 30, 60, 120, 240 }, |
7db0db3f | 229 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
230 | }, |
231 | [tmp100] = { | |
232 | .set_mask = 3 << 5, /* 12-bit mode */ | |
233 | .clr_mask = 1 << 7, /* not one-shot mode */ | |
234 | .default_resolution = 12, | |
7db0db3f GR |
235 | .default_sample_time = 320, |
236 | .num_sample_times = 4, | |
35cd1804 | 237 | .sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
7db0db3f | 238 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
239 | }, |
240 | [tmp101] = { | |
241 | .set_mask = 3 << 5, /* 12-bit mode */ | |
242 | .clr_mask = 1 << 7, /* not one-shot mode */ | |
243 | .default_resolution = 12, | |
7db0db3f GR |
244 | .default_sample_time = 320, |
245 | .num_sample_times = 4, | |
35cd1804 | 246 | .sample_times = (unsigned int []){ 40, 80, 160, 320 }, |
7db0db3f | 247 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 | 248 | }, |
7db0db3f | 249 | [tmp105] = { |
dcb12653 | 250 | .set_mask = 3 << 5, /* 12-bit mode */ |
7db0db3f | 251 | .clr_mask = 1 << 7, /* not one-shot mode*/ |
dcb12653 | 252 | .default_resolution = 12, |
7db0db3f GR |
253 | .default_sample_time = 220, |
254 | .num_sample_times = 4, | |
35cd1804 | 255 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
7db0db3f | 256 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 | 257 | }, |
7db0db3f | 258 | [tmp112] = { |
35cd1804 | 259 | .set_mask = 3 << 5, /* 8 samples / second */ |
7db0db3f | 260 | .clr_mask = 1 << 7, /* no one-shot mode*/ |
dcb12653 | 261 | .default_resolution = 12, |
35cd1804 | 262 | .default_sample_time = 125, |
cee04a01 GR |
263 | .num_sample_times = 4, |
264 | .sample_times = (unsigned int []){ 125, 250, 1000, 4000 }, | |
dcb12653 IPPS |
265 | }, |
266 | [tmp175] = { | |
267 | .set_mask = 3 << 5, /* 12-bit mode */ | |
268 | .clr_mask = 1 << 7, /* not one-shot mode*/ | |
269 | .default_resolution = 12, | |
7db0db3f GR |
270 | .default_sample_time = 220, |
271 | .num_sample_times = 4, | |
35cd1804 | 272 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
7db0db3f | 273 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
274 | }, |
275 | [tmp275] = { | |
276 | .set_mask = 3 << 5, /* 12-bit mode */ | |
277 | .clr_mask = 1 << 7, /* not one-shot mode*/ | |
278 | .default_resolution = 12, | |
7db0db3f GR |
279 | .default_sample_time = 220, |
280 | .num_sample_times = 4, | |
35cd1804 | 281 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
7db0db3f | 282 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
283 | }, |
284 | [tmp75] = { | |
285 | .set_mask = 3 << 5, /* 12-bit mode */ | |
286 | .clr_mask = 1 << 7, /* not one-shot mode*/ | |
287 | .default_resolution = 12, | |
7db0db3f GR |
288 | .default_sample_time = 220, |
289 | .num_sample_times = 4, | |
35cd1804 | 290 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, |
7db0db3f | 291 | .resolutions = (u8 []) {9, 10, 11, 12 }, |
dcb12653 IPPS |
292 | }, |
293 | [tmp75b] = { /* not one-shot mode, Conversion rate 37Hz */ | |
294 | .clr_mask = 1 << 7 | 3 << 5, | |
295 | .default_resolution = 12, | |
296 | .default_sample_time = MSEC_PER_SEC / 37, | |
7f1a300f IPPS |
297 | .sample_times = (unsigned int []){ MSEC_PER_SEC / 37, |
298 | MSEC_PER_SEC / 18, | |
299 | MSEC_PER_SEC / 9, MSEC_PER_SEC / 4 }, | |
300 | .num_sample_times = 4, | |
dcb12653 IPPS |
301 | }, |
302 | [tmp75c] = { | |
303 | .clr_mask = 1 << 5, /*not one-shot mode*/ | |
304 | .default_resolution = 12, | |
35cd1804 | 305 | .default_sample_time = MSEC_PER_SEC / 12, |
ec081f91 RM |
306 | }, |
307 | [tmp1075] = { /* not one-shot mode, 27.5 ms sample rate */ | |
308 | .clr_mask = 1 << 5 | 1 << 6 | 1 << 7, | |
309 | .default_resolution = 12, | |
310 | .default_sample_time = 28, | |
311 | .num_sample_times = 4, | |
312 | .sample_times = (unsigned int []){ 28, 55, 110, 220 }, | |
dcb12653 IPPS |
313 | } |
314 | }; | |
01a52397 | 315 | |
22e73183 EV |
316 | static inline long lm75_reg_to_mc(s16 temp, u8 resolution) |
317 | { | |
318 | return ((temp >> (16 - resolution)) * 1000) >> (resolution - 8); | |
319 | } | |
320 | ||
58608cfe IPPS |
321 | static int lm75_write_config(struct lm75_data *data, u8 set_mask, |
322 | u8 clr_mask) | |
323 | { | |
324 | u8 value; | |
325 | ||
326 | clr_mask |= LM75_SHUTDOWN; | |
327 | value = data->current_conf & ~clr_mask; | |
328 | value |= set_mask; | |
329 | ||
330 | if (data->current_conf != value) { | |
331 | s32 err; | |
332 | ||
333 | err = i2c_smbus_write_byte_data(data->client, LM75_REG_CONF, | |
334 | value); | |
335 | if (err) | |
336 | return err; | |
337 | data->current_conf = value; | |
338 | } | |
339 | return 0; | |
340 | } | |
341 | ||
08b02433 GR |
342 | static int lm75_read(struct device *dev, enum hwmon_sensor_types type, |
343 | u32 attr, int channel, long *val) | |
22e73183 | 344 | { |
e65365fe | 345 | struct lm75_data *data = dev_get_drvdata(dev); |
08b02433 GR |
346 | unsigned int regval; |
347 | int err, reg; | |
348 | ||
349 | switch (type) { | |
350 | case hwmon_chip: | |
351 | switch (attr) { | |
352 | case hwmon_chip_update_interval: | |
353 | *val = data->sample_time; | |
ccffe776 | 354 | break; |
08b02433 GR |
355 | default: |
356 | return -EINVAL; | |
357 | } | |
358 | break; | |
359 | case hwmon_temp: | |
360 | switch (attr) { | |
361 | case hwmon_temp_input: | |
362 | reg = LM75_REG_TEMP; | |
363 | break; | |
364 | case hwmon_temp_max: | |
365 | reg = LM75_REG_MAX; | |
366 | break; | |
367 | case hwmon_temp_max_hyst: | |
368 | reg = LM75_REG_HYST; | |
369 | break; | |
370 | default: | |
371 | return -EINVAL; | |
372 | } | |
373 | err = regmap_read(data->regmap, reg, ®val); | |
374 | if (err < 0) | |
375 | return err; | |
376 | ||
377 | *val = lm75_reg_to_mc(regval, data->resolution); | |
378 | break; | |
379 | default: | |
380 | return -EINVAL; | |
381 | } | |
22e73183 EV |
382 | return 0; |
383 | } | |
384 | ||
4b5be3c1 | 385 | static int lm75_write_temp(struct device *dev, u32 attr, long temp) |
9ca8e40c | 386 | { |
e65365fe | 387 | struct lm75_data *data = dev_get_drvdata(dev); |
87d0621a | 388 | u8 resolution; |
08b02433 GR |
389 | int reg; |
390 | ||
08b02433 GR |
391 | switch (attr) { |
392 | case hwmon_temp_max: | |
393 | reg = LM75_REG_MAX; | |
394 | break; | |
395 | case hwmon_temp_max_hyst: | |
396 | reg = LM75_REG_HYST; | |
397 | break; | |
398 | default: | |
399 | return -EINVAL; | |
400 | } | |
9ca8e40c | 401 | |
87d0621a JD |
402 | /* |
403 | * Resolution of limit registers is assumed to be the same as the | |
404 | * temperature input register resolution unless given explicitly. | |
405 | */ | |
dcb12653 IPPS |
406 | if (data->params->resolution_limits) |
407 | resolution = data->params->resolution_limits; | |
87d0621a JD |
408 | else |
409 | resolution = data->resolution; | |
410 | ||
87d0621a | 411 | temp = clamp_val(temp, LM75_TEMP_MIN, LM75_TEMP_MAX); |
e65365fe GR |
412 | temp = DIV_ROUND_CLOSEST(temp << (resolution - 8), |
413 | 1000) << (16 - resolution); | |
e65365fe | 414 | |
7d82fcc9 | 415 | return regmap_write(data->regmap, reg, (u16)temp); |
1da177e4 | 416 | } |
1da177e4 | 417 | |
040b106f | 418 | static int lm75_update_interval(struct device *dev, long val) |
4b5be3c1 IPPS |
419 | { |
420 | struct lm75_data *data = dev_get_drvdata(dev); | |
cee04a01 | 421 | unsigned int reg; |
4b5be3c1 IPPS |
422 | u8 index; |
423 | s32 err; | |
424 | ||
040b106f GR |
425 | index = find_closest(val, data->params->sample_times, |
426 | (int)data->params->num_sample_times); | |
4b5be3c1 | 427 | |
cee04a01 GR |
428 | switch (data->kind) { |
429 | default: | |
430 | err = lm75_write_config(data, lm75_sample_set_masks[index], | |
431 | LM75_SAMPLE_CLEAR_MASK); | |
432 | if (err) | |
433 | return err; | |
040b106f | 434 | |
cee04a01 GR |
435 | data->sample_time = data->params->sample_times[index]; |
436 | if (data->params->resolutions) | |
437 | data->resolution = data->params->resolutions[index]; | |
438 | break; | |
439 | case tmp112: | |
440 | err = regmap_read(data->regmap, LM75_REG_CONF, ®); | |
441 | if (err < 0) | |
442 | return err; | |
443 | reg &= ~0x00c0; | |
444 | reg |= (3 - index) << 6; | |
445 | err = regmap_write(data->regmap, LM75_REG_CONF, reg); | |
446 | if (err < 0) | |
447 | return err; | |
448 | data->sample_time = data->params->sample_times[index]; | |
449 | break; | |
d7a85cde GR |
450 | case pct2075: |
451 | err = i2c_smbus_write_byte_data(data->client, PCT2075_REG_IDLE, | |
452 | index + 1); | |
453 | if (err) | |
454 | return err; | |
455 | data->sample_time = data->params->sample_times[index]; | |
456 | break; | |
cee04a01 | 457 | } |
040b106f GR |
458 | return 0; |
459 | } | |
460 | ||
461 | static int lm75_write_chip(struct device *dev, u32 attr, long val) | |
462 | { | |
463 | switch (attr) { | |
464 | case hwmon_chip_update_interval: | |
465 | return lm75_update_interval(dev, val); | |
4b5be3c1 IPPS |
466 | default: |
467 | return -EINVAL; | |
468 | } | |
469 | return 0; | |
470 | } | |
471 | ||
472 | static int lm75_write(struct device *dev, enum hwmon_sensor_types type, | |
473 | u32 attr, int channel, long val) | |
474 | { | |
475 | switch (type) { | |
476 | case hwmon_chip: | |
477 | return lm75_write_chip(dev, attr, val); | |
478 | case hwmon_temp: | |
479 | return lm75_write_temp(dev, attr, val); | |
480 | default: | |
481 | return -EINVAL; | |
482 | } | |
483 | return 0; | |
484 | } | |
485 | ||
08b02433 GR |
486 | static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type, |
487 | u32 attr, int channel) | |
5f7e5e29 | 488 | { |
4b5be3c1 IPPS |
489 | const struct lm75_data *config_data = data; |
490 | ||
08b02433 GR |
491 | switch (type) { |
492 | case hwmon_chip: | |
493 | switch (attr) { | |
494 | case hwmon_chip_update_interval: | |
4b5be3c1 IPPS |
495 | if (config_data->params->num_sample_times > 1) |
496 | return 0644; | |
e6ab6e0e | 497 | return 0444; |
08b02433 GR |
498 | } |
499 | break; | |
500 | case hwmon_temp: | |
501 | switch (attr) { | |
502 | case hwmon_temp_input: | |
e6ab6e0e | 503 | return 0444; |
08b02433 GR |
504 | case hwmon_temp_max: |
505 | case hwmon_temp_max_hyst: | |
e6ab6e0e | 506 | return 0644; |
08b02433 GR |
507 | } |
508 | break; | |
509 | default: | |
510 | break; | |
511 | } | |
512 | return 0; | |
5f7e5e29 GR |
513 | } |
514 | ||
08b02433 | 515 | static const struct hwmon_channel_info *lm75_info[] = { |
e4f6fed1 GR |
516 | HWMON_CHANNEL_INFO(chip, |
517 | HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL), | |
518 | HWMON_CHANNEL_INFO(temp, | |
519 | HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST), | |
08b02433 GR |
520 | NULL |
521 | }; | |
522 | ||
523 | static const struct hwmon_ops lm75_hwmon_ops = { | |
524 | .is_visible = lm75_is_visible, | |
525 | .read = lm75_read, | |
526 | .write = lm75_write, | |
527 | }; | |
528 | ||
529 | static const struct hwmon_chip_info lm75_chip_info = { | |
530 | .ops = &lm75_hwmon_ops, | |
531 | .info = lm75_info, | |
532 | }; | |
9ebd3d82 | 533 | |
e65365fe GR |
534 | static bool lm75_is_writeable_reg(struct device *dev, unsigned int reg) |
535 | { | |
536 | return reg != LM75_REG_TEMP; | |
537 | } | |
538 | ||
539 | static bool lm75_is_volatile_reg(struct device *dev, unsigned int reg) | |
540 | { | |
cee04a01 | 541 | return reg == LM75_REG_TEMP || reg == LM75_REG_CONF; |
e65365fe GR |
542 | } |
543 | ||
544 | static const struct regmap_config lm75_regmap_config = { | |
545 | .reg_bits = 8, | |
546 | .val_bits = 16, | |
d7a85cde | 547 | .max_register = PCT2075_REG_IDLE, |
e65365fe GR |
548 | .writeable_reg = lm75_is_writeable_reg, |
549 | .volatile_reg = lm75_is_volatile_reg, | |
550 | .val_format_endian = REGMAP_ENDIAN_BIG, | |
551 | .cache_type = REGCACHE_RBTREE, | |
1c96a2f6 DF |
552 | .use_single_read = true, |
553 | .use_single_write = true, | |
e65365fe GR |
554 | }; |
555 | ||
707d151b AB |
556 | static void lm75_disable_regulator(void *data) |
557 | { | |
558 | struct lm75_data *lm75 = data; | |
559 | ||
560 | regulator_disable(lm75->vs); | |
561 | } | |
562 | ||
9e37d3e2 GR |
563 | static void lm75_remove(void *data) |
564 | { | |
565 | struct lm75_data *lm75 = data; | |
566 | struct i2c_client *client = lm75->client; | |
567 | ||
568 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, lm75->orig_conf); | |
569 | } | |
570 | ||
67487038 SK |
571 | static const struct i2c_device_id lm75_ids[]; |
572 | ||
573 | static int lm75_probe(struct i2c_client *client) | |
9ebd3d82 | 574 | { |
d663ec49 | 575 | struct device *dev = &client->dev; |
9e37d3e2 | 576 | struct device *hwmon_dev; |
9ebd3d82 | 577 | struct lm75_data *data; |
90e2b545 | 578 | int status, err; |
e97a45f1 JMC |
579 | enum lm75_type kind; |
580 | ||
581 | if (client->dev.of_node) | |
582 | kind = (enum lm75_type)of_device_get_match_data(&client->dev); | |
583 | else | |
67487038 | 584 | kind = i2c_match_id(lm75_ids, client)->driver_data; |
9ebd3d82 DB |
585 | |
586 | if (!i2c_check_functionality(client->adapter, | |
587 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) | |
588 | return -EIO; | |
589 | ||
d663ec49 | 590 | data = devm_kzalloc(dev, sizeof(struct lm75_data), GFP_KERNEL); |
9ebd3d82 DB |
591 | if (!data) |
592 | return -ENOMEM; | |
593 | ||
d663ec49 | 594 | data->client = client; |
dcb12653 | 595 | data->kind = kind; |
e65365fe | 596 | |
707d151b AB |
597 | data->vs = devm_regulator_get(dev, "vs"); |
598 | if (IS_ERR(data->vs)) | |
599 | return PTR_ERR(data->vs); | |
600 | ||
e65365fe GR |
601 | data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config); |
602 | if (IS_ERR(data->regmap)) | |
603 | return PTR_ERR(data->regmap); | |
9ebd3d82 DB |
604 | |
605 | /* Set to LM75 resolution (9 bits, 1/2 degree C) and range. | |
606 | * Then tweak to be more precise when appropriate. | |
607 | */ | |
9ebd3d82 | 608 | |
dcb12653 IPPS |
609 | data->params = &device_params[data->kind]; |
610 | ||
611 | /* Save default sample time and resolution*/ | |
612 | data->sample_time = data->params->default_sample_time; | |
613 | data->resolution = data->params->default_resolution; | |
614 | ||
707d151b AB |
615 | /* Enable the power */ |
616 | err = regulator_enable(data->vs); | |
617 | if (err) { | |
618 | dev_err(dev, "failed to enable regulator: %d\n", err); | |
619 | return err; | |
620 | } | |
621 | ||
622 | err = devm_add_action_or_reset(dev, lm75_disable_regulator, data); | |
623 | if (err) | |
624 | return err; | |
625 | ||
dcb12653 | 626 | /* Cache original configuration */ |
38aefb41 | 627 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9ebd3d82 | 628 | if (status < 0) { |
d663ec49 | 629 | dev_dbg(dev, "Can't read config? %d\n", status); |
13ac7a01 | 630 | return status; |
9ebd3d82 DB |
631 | } |
632 | data->orig_conf = status; | |
58608cfe | 633 | data->current_conf = status; |
9ebd3d82 | 634 | |
58608cfe IPPS |
635 | err = lm75_write_config(data, data->params->set_mask, |
636 | data->params->clr_mask); | |
90e2b545 GR |
637 | if (err) |
638 | return err; | |
9ebd3d82 | 639 | |
58608cfe IPPS |
640 | err = devm_add_action_or_reset(dev, lm75_remove, data); |
641 | if (err) | |
642 | return err; | |
22e73183 | 643 | |
08b02433 GR |
644 | hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, |
645 | data, &lm75_chip_info, | |
646 | NULL); | |
9e37d3e2 GR |
647 | if (IS_ERR(hwmon_dev)) |
648 | return PTR_ERR(hwmon_dev); | |
9ebd3d82 | 649 | |
9e37d3e2 | 650 | dev_info(dev, "%s: sensor '%s'\n", dev_name(hwmon_dev), client->name); |
9ebd3d82 | 651 | |
9ebd3d82 DB |
652 | return 0; |
653 | } | |
654 | ||
655 | static const struct i2c_device_id lm75_ids[] = { | |
e96f9d89 | 656 | { "adt75", adt75, }, |
c851b715 | 657 | { "at30ts74", at30ts74, }, |
9ebd3d82 DB |
658 | { "ds1775", ds1775, }, |
659 | { "ds75", ds75, }, | |
3fbc81e3 | 660 | { "ds7505", ds7505, }, |
c98d6c65 | 661 | { "g751", g751, }, |
9ebd3d82 DB |
662 | { "lm75", lm75, }, |
663 | { "lm75a", lm75a, }, | |
799fc602 | 664 | { "lm75b", lm75b, }, |
9ebd3d82 DB |
665 | { "max6625", max6625, }, |
666 | { "max6626", max6626, }, | |
a54ca77a KY |
667 | { "max31725", max31725, }, |
668 | { "max31726", max31725, }, | |
9ebd3d82 | 669 | { "mcp980x", mcp980x, }, |
557c7ffa | 670 | { "pct2075", pct2075, }, |
9ebd3d82 | 671 | { "stds75", stds75, }, |
2e9a41bb | 672 | { "stlm75", stlm75, }, |
9ebd3d82 DB |
673 | { "tcn75", tcn75, }, |
674 | { "tmp100", tmp100, }, | |
675 | { "tmp101", tmp101, }, | |
6d034059 | 676 | { "tmp105", tmp105, }, |
c83959f8 | 677 | { "tmp112", tmp112, }, |
9ebd3d82 DB |
678 | { "tmp175", tmp175, }, |
679 | { "tmp275", tmp275, }, | |
680 | { "tmp75", tmp75, }, | |
39abe9d8 | 681 | { "tmp75b", tmp75b, }, |
9c32e815 | 682 | { "tmp75c", tmp75c, }, |
ec081f91 | 683 | { "tmp1075", tmp1075, }, |
9ebd3d82 DB |
684 | { /* LIST END */ } |
685 | }; | |
686 | MODULE_DEVICE_TABLE(i2c, lm75_ids); | |
687 | ||
ffa83e78 | 688 | static const struct of_device_id __maybe_unused lm75_of_match[] = { |
e97a45f1 JMC |
689 | { |
690 | .compatible = "adi,adt75", | |
691 | .data = (void *)adt75 | |
692 | }, | |
c851b715 PR |
693 | { |
694 | .compatible = "atmel,at30ts74", | |
695 | .data = (void *)at30ts74 | |
696 | }, | |
e97a45f1 JMC |
697 | { |
698 | .compatible = "dallas,ds1775", | |
699 | .data = (void *)ds1775 | |
700 | }, | |
701 | { | |
702 | .compatible = "dallas,ds75", | |
703 | .data = (void *)ds75 | |
704 | }, | |
705 | { | |
706 | .compatible = "dallas,ds7505", | |
707 | .data = (void *)ds7505 | |
708 | }, | |
709 | { | |
710 | .compatible = "gmt,g751", | |
711 | .data = (void *)g751 | |
712 | }, | |
713 | { | |
714 | .compatible = "national,lm75", | |
715 | .data = (void *)lm75 | |
716 | }, | |
717 | { | |
718 | .compatible = "national,lm75a", | |
719 | .data = (void *)lm75a | |
720 | }, | |
721 | { | |
722 | .compatible = "national,lm75b", | |
723 | .data = (void *)lm75b | |
724 | }, | |
725 | { | |
726 | .compatible = "maxim,max6625", | |
727 | .data = (void *)max6625 | |
728 | }, | |
729 | { | |
730 | .compatible = "maxim,max6626", | |
731 | .data = (void *)max6626 | |
732 | }, | |
a54ca77a KY |
733 | { |
734 | .compatible = "maxim,max31725", | |
735 | .data = (void *)max31725 | |
736 | }, | |
737 | { | |
738 | .compatible = "maxim,max31726", | |
739 | .data = (void *)max31725 | |
740 | }, | |
e97a45f1 JMC |
741 | { |
742 | .compatible = "maxim,mcp980x", | |
743 | .data = (void *)mcp980x | |
744 | }, | |
557c7ffa DM |
745 | { |
746 | .compatible = "nxp,pct2075", | |
747 | .data = (void *)pct2075 | |
748 | }, | |
e97a45f1 JMC |
749 | { |
750 | .compatible = "st,stds75", | |
751 | .data = (void *)stds75 | |
752 | }, | |
2e9a41bb JT |
753 | { |
754 | .compatible = "st,stlm75", | |
755 | .data = (void *)stlm75 | |
756 | }, | |
e97a45f1 JMC |
757 | { |
758 | .compatible = "microchip,tcn75", | |
759 | .data = (void *)tcn75 | |
760 | }, | |
761 | { | |
762 | .compatible = "ti,tmp100", | |
763 | .data = (void *)tmp100 | |
764 | }, | |
765 | { | |
766 | .compatible = "ti,tmp101", | |
767 | .data = (void *)tmp101 | |
768 | }, | |
769 | { | |
770 | .compatible = "ti,tmp105", | |
771 | .data = (void *)tmp105 | |
772 | }, | |
773 | { | |
774 | .compatible = "ti,tmp112", | |
775 | .data = (void *)tmp112 | |
776 | }, | |
777 | { | |
778 | .compatible = "ti,tmp175", | |
779 | .data = (void *)tmp175 | |
780 | }, | |
781 | { | |
782 | .compatible = "ti,tmp275", | |
783 | .data = (void *)tmp275 | |
784 | }, | |
785 | { | |
786 | .compatible = "ti,tmp75", | |
787 | .data = (void *)tmp75 | |
788 | }, | |
39abe9d8 IPPS |
789 | { |
790 | .compatible = "ti,tmp75b", | |
791 | .data = (void *)tmp75b | |
792 | }, | |
e97a45f1 JMC |
793 | { |
794 | .compatible = "ti,tmp75c", | |
795 | .data = (void *)tmp75c | |
796 | }, | |
ec081f91 RM |
797 | { |
798 | .compatible = "ti,tmp1075", | |
799 | .data = (void *)tmp1075 | |
800 | }, | |
e97a45f1 JMC |
801 | { }, |
802 | }; | |
803 | MODULE_DEVICE_TABLE(of, lm75_of_match); | |
804 | ||
05e82fe4 LS |
805 | #define LM75A_ID 0xA1 |
806 | ||
8ff69eeb | 807 | /* Return 0 if detection is successful, -ENODEV otherwise */ |
310ec792 | 808 | static int lm75_detect(struct i2c_client *new_client, |
8ff69eeb | 809 | struct i2c_board_info *info) |
1da177e4 | 810 | { |
8ff69eeb | 811 | struct i2c_adapter *adapter = new_client->adapter; |
1da177e4 | 812 | int i; |
e76f67b5 | 813 | int conf, hyst, os; |
05e82fe4 | 814 | bool is_lm75a = 0; |
1da177e4 | 815 | |
1da177e4 LT |
816 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA | |
817 | I2C_FUNC_SMBUS_WORD_DATA)) | |
8ff69eeb | 818 | return -ENODEV; |
1da177e4 | 819 | |
426343ef JD |
820 | /* |
821 | * Now, we do the remaining detection. There is no identification- | |
822 | * dedicated register so we have to rely on several tricks: | |
823 | * unused bits, registers cycling over 8-address boundaries, | |
824 | * addresses 0x04-0x07 returning the last read value. | |
825 | * The cycling+unused addresses combination is not tested, | |
826 | * since it would significantly slow the detection down and would | |
827 | * hardly add any value. | |
828 | * | |
829 | * The National Semiconductor LM75A is different than earlier | |
830 | * LM75s. It has an ID byte of 0xaX (where X is the chip | |
831 | * revision, with 1 being the only revision in existence) in | |
832 | * register 7, and unused registers return 0xff rather than the | |
833 | * last read value. | |
834 | * | |
835 | * Note that this function only detects the original National | |
836 | * Semiconductor LM75 and the LM75A. Clones from other vendors | |
837 | * aren't detected, on purpose, because they are typically never | |
838 | * found on PC hardware. They are found on embedded designs where | |
839 | * they can be instantiated explicitly so detection is not needed. | |
840 | * The absence of identification registers on all these clones | |
841 | * would make their exhaustive detection very difficult and weak, | |
842 | * and odds are that the driver would bind to unsupported devices. | |
843 | */ | |
1da177e4 | 844 | |
e76f67b5 | 845 | /* Unused bits */ |
52df6440 | 846 | conf = i2c_smbus_read_byte_data(new_client, 1); |
e76f67b5 JD |
847 | if (conf & 0xe0) |
848 | return -ENODEV; | |
05e82fe4 LS |
849 | |
850 | /* First check for LM75A */ | |
851 | if (i2c_smbus_read_byte_data(new_client, 7) == LM75A_ID) { | |
8cbf2172 MO |
852 | /* |
853 | * LM75A returns 0xff on unused registers so | |
854 | * just to be sure we check for that too. | |
855 | */ | |
05e82fe4 LS |
856 | if (i2c_smbus_read_byte_data(new_client, 4) != 0xff |
857 | || i2c_smbus_read_byte_data(new_client, 5) != 0xff | |
858 | || i2c_smbus_read_byte_data(new_client, 6) != 0xff) | |
859 | return -ENODEV; | |
860 | is_lm75a = 1; | |
e76f67b5 JD |
861 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
862 | os = i2c_smbus_read_byte_data(new_client, 3); | |
05e82fe4 LS |
863 | } else { /* Traditional style LM75 detection */ |
864 | /* Unused addresses */ | |
e76f67b5 JD |
865 | hyst = i2c_smbus_read_byte_data(new_client, 2); |
866 | if (i2c_smbus_read_byte_data(new_client, 4) != hyst | |
867 | || i2c_smbus_read_byte_data(new_client, 5) != hyst | |
868 | || i2c_smbus_read_byte_data(new_client, 6) != hyst | |
869 | || i2c_smbus_read_byte_data(new_client, 7) != hyst) | |
05e82fe4 | 870 | return -ENODEV; |
e76f67b5 JD |
871 | os = i2c_smbus_read_byte_data(new_client, 3); |
872 | if (i2c_smbus_read_byte_data(new_client, 4) != os | |
873 | || i2c_smbus_read_byte_data(new_client, 5) != os | |
874 | || i2c_smbus_read_byte_data(new_client, 6) != os | |
875 | || i2c_smbus_read_byte_data(new_client, 7) != os) | |
05e82fe4 LS |
876 | return -ENODEV; |
877 | } | |
4ad40cc5 GR |
878 | /* |
879 | * It is very unlikely that this is a LM75 if both | |
880 | * hysteresis and temperature limit registers are 0. | |
881 | */ | |
882 | if (hyst == 0 && os == 0) | |
883 | return -ENODEV; | |
1da177e4 | 884 | |
52df6440 | 885 | /* Addresses cycling */ |
e76f67b5 | 886 | for (i = 8; i <= 248; i += 40) { |
52df6440 | 887 | if (i2c_smbus_read_byte_data(new_client, i + 1) != conf |
e76f67b5 JD |
888 | || i2c_smbus_read_byte_data(new_client, i + 2) != hyst |
889 | || i2c_smbus_read_byte_data(new_client, i + 3) != os) | |
52df6440 | 890 | return -ENODEV; |
05e82fe4 LS |
891 | if (is_lm75a && i2c_smbus_read_byte_data(new_client, i + 7) |
892 | != LM75A_ID) | |
893 | return -ENODEV; | |
1da177e4 LT |
894 | } |
895 | ||
f2f394db | 896 | strscpy(info->type, is_lm75a ? "lm75a" : "lm75", I2C_NAME_SIZE); |
c1685f61 | 897 | |
1da177e4 | 898 | return 0; |
01a52397 DB |
899 | } |
900 | ||
9914518e SD |
901 | #ifdef CONFIG_PM |
902 | static int lm75_suspend(struct device *dev) | |
903 | { | |
904 | int status; | |
905 | struct i2c_client *client = to_i2c_client(dev); | |
8cbf2172 | 906 | |
38aefb41 | 907 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
908 | if (status < 0) { |
909 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
910 | return status; | |
911 | } | |
912 | status = status | LM75_SHUTDOWN; | |
38aefb41 | 913 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
914 | return 0; |
915 | } | |
916 | ||
917 | static int lm75_resume(struct device *dev) | |
918 | { | |
919 | int status; | |
920 | struct i2c_client *client = to_i2c_client(dev); | |
8cbf2172 | 921 | |
38aefb41 | 922 | status = i2c_smbus_read_byte_data(client, LM75_REG_CONF); |
9914518e SD |
923 | if (status < 0) { |
924 | dev_dbg(&client->dev, "Can't read config? %d\n", status); | |
925 | return status; | |
926 | } | |
927 | status = status & ~LM75_SHUTDOWN; | |
38aefb41 | 928 | i2c_smbus_write_byte_data(client, LM75_REG_CONF, status); |
9914518e SD |
929 | return 0; |
930 | } | |
931 | ||
932 | static const struct dev_pm_ops lm75_dev_pm_ops = { | |
933 | .suspend = lm75_suspend, | |
934 | .resume = lm75_resume, | |
935 | }; | |
936 | #define LM75_DEV_PM_OPS (&lm75_dev_pm_ops) | |
937 | #else | |
938 | #define LM75_DEV_PM_OPS NULL | |
939 | #endif /* CONFIG_PM */ | |
940 | ||
8ff69eeb JD |
941 | static struct i2c_driver lm75_driver = { |
942 | .class = I2C_CLASS_HWMON, | |
01a52397 | 943 | .driver = { |
8ff69eeb | 944 | .name = "lm75", |
e97a45f1 | 945 | .of_match_table = of_match_ptr(lm75_of_match), |
9914518e | 946 | .pm = LM75_DEV_PM_OPS, |
01a52397 | 947 | }, |
67487038 | 948 | .probe_new = lm75_probe, |
8ff69eeb JD |
949 | .id_table = lm75_ids, |
950 | .detect = lm75_detect, | |
c3813d6a | 951 | .address_list = normal_i2c, |
01a52397 DB |
952 | }; |
953 | ||
f0967eea | 954 | module_i2c_driver(lm75_driver); |
1da177e4 LT |
955 | |
956 | MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); | |
957 | MODULE_DESCRIPTION("LM75 driver"); | |
958 | MODULE_LICENSE("GPL"); |