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7c84f7f8 DF |
1 | /* Sensirion SHT3x-DIS humidity and temperature sensor driver. |
2 | * The SHT3x comes in many different versions, this driver is for the | |
3 | * I2C version only. | |
4 | * | |
5 | * Copyright (C) 2016 Sensirion AG, Switzerland | |
6 | * Author: David Frey <david.frey@sensirion.com> | |
7 | * Author: Pascal Sachs <pascal.sachs@sensirion.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <asm/page.h> | |
22 | #include <linux/crc8.h> | |
23 | #include <linux/delay.h> | |
24 | #include <linux/err.h> | |
25 | #include <linux/hwmon.h> | |
26 | #include <linux/hwmon-sysfs.h> | |
27 | #include <linux/i2c.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/module.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/jiffies.h> | |
33 | #include <linux/platform_data/sht3x.h> | |
34 | ||
35 | /* commands (high precision mode) */ | |
36 | static const unsigned char sht3x_cmd_measure_blocking_hpm[] = { 0x2c, 0x06 }; | |
37 | static const unsigned char sht3x_cmd_measure_nonblocking_hpm[] = { 0x24, 0x00 }; | |
38 | ||
39 | /* commands (low power mode) */ | |
40 | static const unsigned char sht3x_cmd_measure_blocking_lpm[] = { 0x2c, 0x10 }; | |
41 | static const unsigned char sht3x_cmd_measure_nonblocking_lpm[] = { 0x24, 0x16 }; | |
42 | ||
43 | /* commands for periodic mode */ | |
44 | static const unsigned char sht3x_cmd_measure_periodic_mode[] = { 0xe0, 0x00 }; | |
45 | static const unsigned char sht3x_cmd_break[] = { 0x30, 0x93 }; | |
46 | ||
50c22cd1 MR |
47 | /* commands for heater control */ |
48 | static const unsigned char sht3x_cmd_heater_on[] = { 0x30, 0x6d }; | |
49 | static const unsigned char sht3x_cmd_heater_off[] = { 0x30, 0x66 }; | |
50 | ||
7c84f7f8 DF |
51 | /* other commands */ |
52 | static const unsigned char sht3x_cmd_read_status_reg[] = { 0xf3, 0x2d }; | |
53 | static const unsigned char sht3x_cmd_clear_status_reg[] = { 0x30, 0x41 }; | |
54 | ||
55 | /* delays for non-blocking i2c commands, both in us */ | |
56 | #define SHT3X_NONBLOCKING_WAIT_TIME_HPM 15000 | |
57 | #define SHT3X_NONBLOCKING_WAIT_TIME_LPM 4000 | |
58 | ||
59 | #define SHT3X_WORD_LEN 2 | |
60 | #define SHT3X_CMD_LENGTH 2 | |
61 | #define SHT3X_CRC8_LEN 1 | |
62 | #define SHT3X_RESPONSE_LENGTH 6 | |
63 | #define SHT3X_CRC8_POLYNOMIAL 0x31 | |
64 | #define SHT3X_CRC8_INIT 0xFF | |
65 | #define SHT3X_MIN_TEMPERATURE -45000 | |
66 | #define SHT3X_MAX_TEMPERATURE 130000 | |
67 | #define SHT3X_MIN_HUMIDITY 0 | |
68 | #define SHT3X_MAX_HUMIDITY 100000 | |
69 | ||
70 | enum sht3x_chips { | |
71 | sht3x, | |
72 | sts3x, | |
73 | }; | |
74 | ||
75 | enum sht3x_limits { | |
76 | limit_max = 0, | |
77 | limit_max_hyst, | |
78 | limit_min, | |
79 | limit_min_hyst, | |
80 | }; | |
81 | ||
82 | DECLARE_CRC8_TABLE(sht3x_crc8_table); | |
83 | ||
84 | /* periodic measure commands (high precision mode) */ | |
85 | static const char periodic_measure_commands_hpm[][SHT3X_CMD_LENGTH] = { | |
86 | /* 0.5 measurements per second */ | |
87 | {0x20, 0x32}, | |
88 | /* 1 measurements per second */ | |
89 | {0x21, 0x30}, | |
90 | /* 2 measurements per second */ | |
91 | {0x22, 0x36}, | |
92 | /* 4 measurements per second */ | |
93 | {0x23, 0x34}, | |
94 | /* 10 measurements per second */ | |
95 | {0x27, 0x37}, | |
96 | }; | |
97 | ||
98 | /* periodic measure commands (low power mode) */ | |
99 | static const char periodic_measure_commands_lpm[][SHT3X_CMD_LENGTH] = { | |
100 | /* 0.5 measurements per second */ | |
101 | {0x20, 0x2f}, | |
102 | /* 1 measurements per second */ | |
103 | {0x21, 0x2d}, | |
104 | /* 2 measurements per second */ | |
105 | {0x22, 0x2b}, | |
106 | /* 4 measurements per second */ | |
107 | {0x23, 0x29}, | |
108 | /* 10 measurements per second */ | |
109 | {0x27, 0x2a}, | |
110 | }; | |
111 | ||
112 | struct sht3x_limit_commands { | |
113 | const char read_command[SHT3X_CMD_LENGTH]; | |
114 | const char write_command[SHT3X_CMD_LENGTH]; | |
115 | }; | |
116 | ||
117 | static const struct sht3x_limit_commands limit_commands[] = { | |
118 | /* temp1_max, humidity1_max */ | |
119 | [limit_max] = { {0xe1, 0x1f}, {0x61, 0x1d} }, | |
120 | /* temp_1_max_hyst, humidity1_max_hyst */ | |
121 | [limit_max_hyst] = { {0xe1, 0x14}, {0x61, 0x16} }, | |
122 | /* temp1_min, humidity1_min */ | |
123 | [limit_min] = { {0xe1, 0x02}, {0x61, 0x00} }, | |
124 | /* temp_1_min_hyst, humidity1_min_hyst */ | |
125 | [limit_min_hyst] = { {0xe1, 0x09}, {0x61, 0x0B} }, | |
126 | }; | |
127 | ||
128 | #define SHT3X_NUM_LIMIT_CMD ARRAY_SIZE(limit_commands) | |
129 | ||
130 | static const u16 mode_to_update_interval[] = { | |
131 | 0, | |
132 | 2000, | |
133 | 1000, | |
134 | 500, | |
135 | 250, | |
136 | 100, | |
137 | }; | |
138 | ||
139 | struct sht3x_data { | |
140 | struct i2c_client *client; | |
141 | struct mutex i2c_lock; /* lock for sending i2c commands */ | |
142 | struct mutex data_lock; /* lock for updating driver data */ | |
143 | ||
144 | u8 mode; | |
145 | const unsigned char *command; | |
146 | u32 wait_time; /* in us*/ | |
147 | unsigned long last_update; /* last update in periodic mode*/ | |
148 | ||
149 | struct sht3x_platform_data setup; | |
150 | ||
151 | /* | |
152 | * cached values for temperature and humidity and limits | |
153 | * the limits arrays have the following order: | |
154 | * max, max_hyst, min, min_hyst | |
155 | */ | |
156 | int temperature; | |
157 | int temperature_limits[SHT3X_NUM_LIMIT_CMD]; | |
158 | u32 humidity; | |
159 | u32 humidity_limits[SHT3X_NUM_LIMIT_CMD]; | |
160 | }; | |
161 | ||
162 | static u8 get_mode_from_update_interval(u16 value) | |
163 | { | |
164 | size_t index; | |
165 | u8 number_of_modes = ARRAY_SIZE(mode_to_update_interval); | |
166 | ||
167 | if (value == 0) | |
168 | return 0; | |
169 | ||
170 | /* find next faster update interval */ | |
171 | for (index = 1; index < number_of_modes; index++) { | |
172 | if (mode_to_update_interval[index] <= value) | |
173 | return index; | |
174 | } | |
175 | ||
176 | return number_of_modes - 1; | |
177 | } | |
178 | ||
179 | static int sht3x_read_from_command(struct i2c_client *client, | |
180 | struct sht3x_data *data, | |
181 | const char *command, | |
182 | char *buf, int length, u32 wait_time) | |
183 | { | |
184 | int ret; | |
185 | ||
186 | mutex_lock(&data->i2c_lock); | |
187 | ret = i2c_master_send(client, command, SHT3X_CMD_LENGTH); | |
188 | ||
189 | if (ret != SHT3X_CMD_LENGTH) { | |
190 | ret = ret < 0 ? ret : -EIO; | |
191 | goto out; | |
192 | } | |
193 | ||
194 | if (wait_time) | |
195 | usleep_range(wait_time, wait_time + 1000); | |
196 | ||
197 | ret = i2c_master_recv(client, buf, length); | |
198 | if (ret != length) { | |
199 | ret = ret < 0 ? ret : -EIO; | |
200 | goto out; | |
201 | } | |
202 | ||
203 | ret = 0; | |
204 | out: | |
205 | mutex_unlock(&data->i2c_lock); | |
206 | return ret; | |
207 | } | |
208 | ||
209 | static int sht3x_extract_temperature(u16 raw) | |
210 | { | |
211 | /* | |
212 | * From datasheet: | |
213 | * T = -45 + 175 * ST / 2^16 | |
214 | * Adapted for integer fixed point (3 digit) arithmetic. | |
215 | */ | |
216 | return ((21875 * (int)raw) >> 13) - 45000; | |
217 | } | |
218 | ||
219 | static u32 sht3x_extract_humidity(u16 raw) | |
220 | { | |
221 | /* | |
222 | * From datasheet: | |
223 | * RH = 100 * SRH / 2^16 | |
224 | * Adapted for integer fixed point (3 digit) arithmetic. | |
225 | */ | |
226 | return (12500 * (u32)raw) >> 13; | |
227 | } | |
228 | ||
229 | static struct sht3x_data *sht3x_update_client(struct device *dev) | |
230 | { | |
231 | struct sht3x_data *data = dev_get_drvdata(dev); | |
232 | struct i2c_client *client = data->client; | |
233 | u16 interval_ms = mode_to_update_interval[data->mode]; | |
234 | unsigned long interval_jiffies = msecs_to_jiffies(interval_ms); | |
235 | unsigned char buf[SHT3X_RESPONSE_LENGTH]; | |
236 | u16 val; | |
237 | int ret = 0; | |
238 | ||
239 | mutex_lock(&data->data_lock); | |
240 | /* | |
241 | * Only update cached readings once per update interval in periodic | |
242 | * mode. In single shot mode the sensor measures values on demand, so | |
243 | * every time the sysfs interface is called, a measurement is triggered. | |
244 | * In periodic mode however, the measurement process is handled | |
245 | * internally by the sensor and reading out sensor values only makes | |
246 | * sense if a new reading is available. | |
247 | */ | |
248 | if (time_after(jiffies, data->last_update + interval_jiffies)) { | |
249 | ret = sht3x_read_from_command(client, data, data->command, buf, | |
250 | sizeof(buf), data->wait_time); | |
251 | if (ret) | |
252 | goto out; | |
253 | ||
254 | val = be16_to_cpup((__be16 *)buf); | |
255 | data->temperature = sht3x_extract_temperature(val); | |
256 | val = be16_to_cpup((__be16 *)(buf + 3)); | |
257 | data->humidity = sht3x_extract_humidity(val); | |
258 | data->last_update = jiffies; | |
259 | } | |
260 | ||
261 | out: | |
262 | mutex_unlock(&data->data_lock); | |
263 | if (ret) | |
264 | return ERR_PTR(ret); | |
265 | ||
266 | return data; | |
267 | } | |
268 | ||
269 | /* sysfs attributes */ | |
270 | static ssize_t temp1_input_show(struct device *dev, | |
271 | struct device_attribute *attr, char *buf) | |
272 | { | |
273 | struct sht3x_data *data = sht3x_update_client(dev); | |
274 | ||
275 | if (IS_ERR(data)) | |
276 | return PTR_ERR(data); | |
277 | ||
278 | return sprintf(buf, "%d\n", data->temperature); | |
279 | } | |
280 | ||
281 | static ssize_t humidity1_input_show(struct device *dev, | |
282 | struct device_attribute *attr, char *buf) | |
283 | { | |
284 | struct sht3x_data *data = sht3x_update_client(dev); | |
285 | ||
286 | if (IS_ERR(data)) | |
287 | return PTR_ERR(data); | |
288 | ||
289 | return sprintf(buf, "%u\n", data->humidity); | |
290 | } | |
291 | ||
292 | /* | |
293 | * limits_update must only be called from probe or with data_lock held | |
294 | */ | |
295 | static int limits_update(struct sht3x_data *data) | |
296 | { | |
297 | int ret; | |
298 | u8 index; | |
299 | int temperature; | |
300 | u32 humidity; | |
301 | u16 raw; | |
302 | char buffer[SHT3X_RESPONSE_LENGTH]; | |
303 | const struct sht3x_limit_commands *commands; | |
304 | struct i2c_client *client = data->client; | |
305 | ||
306 | for (index = 0; index < SHT3X_NUM_LIMIT_CMD; index++) { | |
307 | commands = &limit_commands[index]; | |
308 | ret = sht3x_read_from_command(client, data, | |
309 | commands->read_command, buffer, | |
310 | SHT3X_RESPONSE_LENGTH, 0); | |
311 | ||
312 | if (ret) | |
313 | return ret; | |
314 | ||
315 | raw = be16_to_cpup((__be16 *)buffer); | |
316 | temperature = sht3x_extract_temperature((raw & 0x01ff) << 7); | |
317 | humidity = sht3x_extract_humidity(raw & 0xfe00); | |
318 | data->temperature_limits[index] = temperature; | |
319 | data->humidity_limits[index] = humidity; | |
320 | } | |
321 | ||
322 | return ret; | |
323 | } | |
324 | ||
325 | static ssize_t temp1_limit_show(struct device *dev, | |
326 | struct device_attribute *attr, | |
327 | char *buf) | |
328 | { | |
329 | struct sht3x_data *data = dev_get_drvdata(dev); | |
330 | u8 index = to_sensor_dev_attr(attr)->index; | |
331 | int temperature_limit = data->temperature_limits[index]; | |
332 | ||
333 | return scnprintf(buf, PAGE_SIZE, "%d\n", temperature_limit); | |
334 | } | |
335 | ||
336 | static ssize_t humidity1_limit_show(struct device *dev, | |
337 | struct device_attribute *attr, | |
338 | char *buf) | |
339 | { | |
340 | struct sht3x_data *data = dev_get_drvdata(dev); | |
341 | u8 index = to_sensor_dev_attr(attr)->index; | |
342 | u32 humidity_limit = data->humidity_limits[index]; | |
343 | ||
344 | return scnprintf(buf, PAGE_SIZE, "%u\n", humidity_limit); | |
345 | } | |
346 | ||
347 | /* | |
348 | * limit_store must only be called with data_lock held | |
349 | */ | |
350 | static size_t limit_store(struct device *dev, | |
351 | size_t count, | |
352 | u8 index, | |
353 | int temperature, | |
354 | u32 humidity) | |
355 | { | |
356 | char buffer[SHT3X_CMD_LENGTH + SHT3X_WORD_LEN + SHT3X_CRC8_LEN]; | |
357 | char *position = buffer; | |
358 | int ret; | |
359 | u16 raw; | |
360 | struct sht3x_data *data = dev_get_drvdata(dev); | |
361 | struct i2c_client *client = data->client; | |
362 | const struct sht3x_limit_commands *commands; | |
363 | ||
364 | commands = &limit_commands[index]; | |
365 | ||
366 | memcpy(position, commands->write_command, SHT3X_CMD_LENGTH); | |
367 | position += SHT3X_CMD_LENGTH; | |
368 | /* | |
369 | * ST = (T + 45) / 175 * 2^16 | |
370 | * SRH = RH / 100 * 2^16 | |
371 | * adapted for fixed point arithmetic and packed the same as | |
372 | * in limit_show() | |
373 | */ | |
374 | raw = ((u32)(temperature + 45000) * 24543) >> (16 + 7); | |
375 | raw |= ((humidity * 42950) >> 16) & 0xfe00; | |
376 | ||
377 | *((__be16 *)position) = cpu_to_be16(raw); | |
378 | position += SHT3X_WORD_LEN; | |
379 | *position = crc8(sht3x_crc8_table, | |
380 | position - SHT3X_WORD_LEN, | |
381 | SHT3X_WORD_LEN, | |
382 | SHT3X_CRC8_INIT); | |
383 | ||
384 | mutex_lock(&data->i2c_lock); | |
385 | ret = i2c_master_send(client, buffer, sizeof(buffer)); | |
386 | mutex_unlock(&data->i2c_lock); | |
387 | ||
388 | if (ret != sizeof(buffer)) | |
389 | return ret < 0 ? ret : -EIO; | |
390 | ||
391 | data->temperature_limits[index] = temperature; | |
392 | data->humidity_limits[index] = humidity; | |
393 | return count; | |
394 | } | |
395 | ||
396 | static ssize_t temp1_limit_store(struct device *dev, | |
397 | struct device_attribute *attr, | |
398 | const char *buf, | |
399 | size_t count) | |
400 | { | |
401 | int temperature; | |
402 | int ret; | |
403 | struct sht3x_data *data = dev_get_drvdata(dev); | |
404 | u8 index = to_sensor_dev_attr(attr)->index; | |
405 | ||
406 | ret = kstrtoint(buf, 0, &temperature); | |
407 | if (ret) | |
408 | return ret; | |
409 | ||
410 | temperature = clamp_val(temperature, SHT3X_MIN_TEMPERATURE, | |
411 | SHT3X_MAX_TEMPERATURE); | |
412 | mutex_lock(&data->data_lock); | |
413 | ret = limit_store(dev, count, index, temperature, | |
414 | data->humidity_limits[index]); | |
415 | mutex_unlock(&data->data_lock); | |
416 | ||
417 | return ret; | |
418 | } | |
419 | ||
420 | static ssize_t humidity1_limit_store(struct device *dev, | |
421 | struct device_attribute *attr, | |
422 | const char *buf, | |
423 | size_t count) | |
424 | { | |
425 | u32 humidity; | |
426 | int ret; | |
427 | struct sht3x_data *data = dev_get_drvdata(dev); | |
428 | u8 index = to_sensor_dev_attr(attr)->index; | |
429 | ||
430 | ret = kstrtou32(buf, 0, &humidity); | |
431 | if (ret) | |
432 | return ret; | |
433 | ||
434 | humidity = clamp_val(humidity, SHT3X_MIN_HUMIDITY, SHT3X_MAX_HUMIDITY); | |
435 | mutex_lock(&data->data_lock); | |
436 | ret = limit_store(dev, count, index, data->temperature_limits[index], | |
437 | humidity); | |
438 | mutex_unlock(&data->data_lock); | |
439 | ||
440 | return ret; | |
441 | } | |
442 | ||
443 | static void sht3x_select_command(struct sht3x_data *data) | |
444 | { | |
445 | /* | |
446 | * In blocking mode (clock stretching mode) the I2C bus | |
447 | * is blocked for other traffic, thus the call to i2c_master_recv() | |
448 | * will wait until the data is ready. For non blocking mode, we | |
449 | * have to wait ourselves. | |
450 | */ | |
451 | if (data->mode > 0) { | |
452 | data->command = sht3x_cmd_measure_periodic_mode; | |
453 | data->wait_time = 0; | |
454 | } else if (data->setup.blocking_io) { | |
455 | data->command = data->setup.high_precision ? | |
456 | sht3x_cmd_measure_blocking_hpm : | |
457 | sht3x_cmd_measure_blocking_lpm; | |
458 | data->wait_time = 0; | |
459 | } else { | |
460 | if (data->setup.high_precision) { | |
461 | data->command = sht3x_cmd_measure_nonblocking_hpm; | |
462 | data->wait_time = SHT3X_NONBLOCKING_WAIT_TIME_HPM; | |
463 | } else { | |
464 | data->command = sht3x_cmd_measure_nonblocking_lpm; | |
465 | data->wait_time = SHT3X_NONBLOCKING_WAIT_TIME_LPM; | |
466 | } | |
467 | } | |
468 | } | |
469 | ||
470 | static int status_register_read(struct device *dev, | |
471 | struct device_attribute *attr, | |
472 | char *buffer, int length) | |
473 | { | |
474 | int ret; | |
475 | struct sht3x_data *data = dev_get_drvdata(dev); | |
476 | struct i2c_client *client = data->client; | |
477 | ||
478 | ret = sht3x_read_from_command(client, data, sht3x_cmd_read_status_reg, | |
479 | buffer, length, 0); | |
480 | ||
481 | return ret; | |
482 | } | |
483 | ||
484 | static ssize_t temp1_alarm_show(struct device *dev, | |
485 | struct device_attribute *attr, | |
486 | char *buf) | |
487 | { | |
488 | char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN]; | |
489 | int ret; | |
490 | ||
491 | ret = status_register_read(dev, attr, buffer, | |
492 | SHT3X_WORD_LEN + SHT3X_CRC8_LEN); | |
493 | if (ret) | |
494 | return ret; | |
495 | ||
496 | return scnprintf(buf, PAGE_SIZE, "%d\n", !!(buffer[0] & 0x04)); | |
497 | } | |
498 | ||
499 | static ssize_t humidity1_alarm_show(struct device *dev, | |
500 | struct device_attribute *attr, | |
501 | char *buf) | |
502 | { | |
503 | char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN]; | |
504 | int ret; | |
505 | ||
506 | ret = status_register_read(dev, attr, buffer, | |
507 | SHT3X_WORD_LEN + SHT3X_CRC8_LEN); | |
508 | if (ret) | |
509 | return ret; | |
510 | ||
511 | return scnprintf(buf, PAGE_SIZE, "%d\n", !!(buffer[0] & 0x08)); | |
512 | } | |
513 | ||
50c22cd1 MR |
514 | static ssize_t heater_enable_show(struct device *dev, |
515 | struct device_attribute *attr, | |
516 | char *buf) | |
517 | { | |
518 | char buffer[SHT3X_WORD_LEN + SHT3X_CRC8_LEN]; | |
519 | int ret; | |
520 | ||
521 | ret = status_register_read(dev, attr, buffer, | |
522 | SHT3X_WORD_LEN + SHT3X_CRC8_LEN); | |
523 | if (ret) | |
524 | return ret; | |
525 | ||
526 | return scnprintf(buf, PAGE_SIZE, "%d\n", !!(buffer[0] & 0x20)); | |
527 | } | |
528 | ||
529 | static ssize_t heater_enable_store(struct device *dev, | |
530 | struct device_attribute *attr, | |
531 | const char *buf, | |
532 | size_t count) | |
533 | { | |
534 | struct sht3x_data *data = dev_get_drvdata(dev); | |
535 | struct i2c_client *client = data->client; | |
536 | int ret; | |
537 | bool status; | |
538 | ||
539 | ret = kstrtobool(buf, &status); | |
540 | if (ret) | |
541 | return ret; | |
542 | ||
543 | mutex_lock(&data->i2c_lock); | |
544 | ||
545 | if (status) | |
546 | ret = i2c_master_send(client, (char *)&sht3x_cmd_heater_on, | |
547 | SHT3X_CMD_LENGTH); | |
548 | else | |
549 | ret = i2c_master_send(client, (char *)&sht3x_cmd_heater_off, | |
550 | SHT3X_CMD_LENGTH); | |
551 | ||
552 | mutex_unlock(&data->i2c_lock); | |
553 | ||
554 | return ret; | |
555 | } | |
556 | ||
7c84f7f8 DF |
557 | static ssize_t update_interval_show(struct device *dev, |
558 | struct device_attribute *attr, | |
559 | char *buf) | |
560 | { | |
561 | struct sht3x_data *data = dev_get_drvdata(dev); | |
562 | ||
563 | return scnprintf(buf, PAGE_SIZE, "%u\n", | |
564 | mode_to_update_interval[data->mode]); | |
565 | } | |
566 | ||
567 | static ssize_t update_interval_store(struct device *dev, | |
568 | struct device_attribute *attr, | |
569 | const char *buf, | |
570 | size_t count) | |
571 | { | |
572 | u16 update_interval; | |
573 | u8 mode; | |
574 | int ret; | |
575 | const char *command; | |
576 | struct sht3x_data *data = dev_get_drvdata(dev); | |
577 | struct i2c_client *client = data->client; | |
578 | ||
579 | ret = kstrtou16(buf, 0, &update_interval); | |
580 | if (ret) | |
581 | return ret; | |
582 | ||
583 | mode = get_mode_from_update_interval(update_interval); | |
584 | ||
585 | mutex_lock(&data->data_lock); | |
586 | /* mode did not change */ | |
587 | if (mode == data->mode) { | |
588 | mutex_unlock(&data->data_lock); | |
589 | return count; | |
590 | } | |
591 | ||
592 | mutex_lock(&data->i2c_lock); | |
593 | /* | |
594 | * Abort periodic measure mode. | |
595 | * To do any changes to the configuration while in periodic mode, we | |
596 | * have to send a break command to the sensor, which then falls back | |
597 | * to single shot (mode = 0). | |
598 | */ | |
599 | if (data->mode > 0) { | |
600 | ret = i2c_master_send(client, sht3x_cmd_break, | |
601 | SHT3X_CMD_LENGTH); | |
602 | if (ret != SHT3X_CMD_LENGTH) | |
603 | goto out; | |
604 | data->mode = 0; | |
605 | } | |
606 | ||
607 | if (mode > 0) { | |
608 | if (data->setup.high_precision) | |
609 | command = periodic_measure_commands_hpm[mode - 1]; | |
610 | else | |
611 | command = periodic_measure_commands_lpm[mode - 1]; | |
612 | ||
613 | /* select mode */ | |
614 | ret = i2c_master_send(client, command, SHT3X_CMD_LENGTH); | |
615 | if (ret != SHT3X_CMD_LENGTH) | |
616 | goto out; | |
617 | } | |
618 | ||
619 | /* select mode and command */ | |
620 | data->mode = mode; | |
621 | sht3x_select_command(data); | |
622 | ||
623 | out: | |
624 | mutex_unlock(&data->i2c_lock); | |
625 | mutex_unlock(&data->data_lock); | |
626 | if (ret != SHT3X_CMD_LENGTH) | |
627 | return ret < 0 ? ret : -EIO; | |
628 | ||
629 | return count; | |
630 | } | |
631 | ||
632 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, temp1_input_show, NULL, 0); | |
633 | static SENSOR_DEVICE_ATTR(humidity1_input, S_IRUGO, humidity1_input_show, | |
634 | NULL, 0); | |
635 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, | |
636 | temp1_limit_show, temp1_limit_store, | |
637 | limit_max); | |
638 | static SENSOR_DEVICE_ATTR(humidity1_max, S_IRUGO | S_IWUSR, | |
639 | humidity1_limit_show, humidity1_limit_store, | |
640 | limit_max); | |
641 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, | |
642 | temp1_limit_show, temp1_limit_store, | |
643 | limit_max_hyst); | |
644 | static SENSOR_DEVICE_ATTR(humidity1_max_hyst, S_IRUGO | S_IWUSR, | |
645 | humidity1_limit_show, humidity1_limit_store, | |
646 | limit_max_hyst); | |
647 | static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, | |
648 | temp1_limit_show, temp1_limit_store, | |
649 | limit_min); | |
650 | static SENSOR_DEVICE_ATTR(humidity1_min, S_IRUGO | S_IWUSR, | |
651 | humidity1_limit_show, humidity1_limit_store, | |
652 | limit_min); | |
653 | static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO | S_IWUSR, | |
654 | temp1_limit_show, temp1_limit_store, | |
655 | limit_min_hyst); | |
656 | static SENSOR_DEVICE_ATTR(humidity1_min_hyst, S_IRUGO | S_IWUSR, | |
657 | humidity1_limit_show, humidity1_limit_store, | |
658 | limit_min_hyst); | |
659 | static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, temp1_alarm_show, NULL, 0); | |
660 | static SENSOR_DEVICE_ATTR(humidity1_alarm, S_IRUGO, humidity1_alarm_show, | |
661 | NULL, 0); | |
50c22cd1 MR |
662 | static SENSOR_DEVICE_ATTR(heater_enable, S_IRUGO | S_IWUSR, |
663 | heater_enable_show, heater_enable_store, 0); | |
7c84f7f8 DF |
664 | static SENSOR_DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, |
665 | update_interval_show, update_interval_store, 0); | |
666 | ||
667 | static struct attribute *sht3x_attrs[] = { | |
668 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
669 | &sensor_dev_attr_humidity1_input.dev_attr.attr, | |
670 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
671 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
672 | &sensor_dev_attr_humidity1_max.dev_attr.attr, | |
673 | &sensor_dev_attr_humidity1_max_hyst.dev_attr.attr, | |
674 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
675 | &sensor_dev_attr_temp1_min_hyst.dev_attr.attr, | |
676 | &sensor_dev_attr_humidity1_min.dev_attr.attr, | |
677 | &sensor_dev_attr_humidity1_min_hyst.dev_attr.attr, | |
678 | &sensor_dev_attr_temp1_alarm.dev_attr.attr, | |
679 | &sensor_dev_attr_humidity1_alarm.dev_attr.attr, | |
50c22cd1 | 680 | &sensor_dev_attr_heater_enable.dev_attr.attr, |
7c84f7f8 DF |
681 | &sensor_dev_attr_update_interval.dev_attr.attr, |
682 | NULL | |
683 | }; | |
684 | ||
685 | static struct attribute *sts3x_attrs[] = { | |
686 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
687 | NULL | |
688 | }; | |
689 | ||
690 | ATTRIBUTE_GROUPS(sht3x); | |
691 | ATTRIBUTE_GROUPS(sts3x); | |
692 | ||
693 | static int sht3x_probe(struct i2c_client *client, | |
694 | const struct i2c_device_id *id) | |
695 | { | |
696 | int ret; | |
697 | struct sht3x_data *data; | |
698 | struct device *hwmon_dev; | |
699 | struct i2c_adapter *adap = client->adapter; | |
700 | struct device *dev = &client->dev; | |
701 | const struct attribute_group **attribute_groups; | |
702 | ||
703 | /* | |
704 | * we require full i2c support since the sht3x uses multi-byte read and | |
705 | * writes as well as multi-byte commands which are not supported by | |
706 | * the smbus protocol | |
707 | */ | |
708 | if (!i2c_check_functionality(adap, I2C_FUNC_I2C)) | |
709 | return -ENODEV; | |
710 | ||
711 | ret = i2c_master_send(client, sht3x_cmd_clear_status_reg, | |
712 | SHT3X_CMD_LENGTH); | |
713 | if (ret != SHT3X_CMD_LENGTH) | |
714 | return ret < 0 ? ret : -ENODEV; | |
715 | ||
716 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); | |
717 | if (!data) | |
718 | return -ENOMEM; | |
719 | ||
720 | data->setup.blocking_io = false; | |
721 | data->setup.high_precision = true; | |
722 | data->mode = 0; | |
723 | data->last_update = 0; | |
724 | data->client = client; | |
725 | crc8_populate_msb(sht3x_crc8_table, SHT3X_CRC8_POLYNOMIAL); | |
726 | ||
727 | if (client->dev.platform_data) | |
728 | data->setup = *(struct sht3x_platform_data *)dev->platform_data; | |
729 | ||
730 | sht3x_select_command(data); | |
731 | ||
732 | mutex_init(&data->i2c_lock); | |
733 | mutex_init(&data->data_lock); | |
734 | ||
735 | ret = limits_update(data); | |
736 | if (ret) | |
737 | return ret; | |
738 | ||
739 | if (id->driver_data == sts3x) | |
740 | attribute_groups = sts3x_groups; | |
741 | else | |
742 | attribute_groups = sht3x_groups; | |
743 | ||
744 | hwmon_dev = devm_hwmon_device_register_with_groups(dev, | |
745 | client->name, | |
746 | data, | |
747 | attribute_groups); | |
748 | ||
749 | if (IS_ERR(hwmon_dev)) | |
750 | dev_dbg(dev, "unable to register hwmon device\n"); | |
751 | ||
752 | return PTR_ERR_OR_ZERO(hwmon_dev); | |
753 | } | |
754 | ||
755 | /* device ID table */ | |
756 | static const struct i2c_device_id sht3x_ids[] = { | |
757 | {"sht3x", sht3x}, | |
758 | {"sts3x", sts3x}, | |
759 | {} | |
760 | }; | |
761 | ||
762 | MODULE_DEVICE_TABLE(i2c, sht3x_ids); | |
763 | ||
764 | static struct i2c_driver sht3x_i2c_driver = { | |
765 | .driver.name = "sht3x", | |
766 | .probe = sht3x_probe, | |
767 | .id_table = sht3x_ids, | |
768 | }; | |
769 | ||
770 | module_i2c_driver(sht3x_i2c_driver); | |
771 | ||
772 | MODULE_AUTHOR("David Frey <david.frey@sensirion.com>"); | |
773 | MODULE_AUTHOR("Pascal Sachs <pascal.sachs@sensirion.com>"); | |
774 | MODULE_DESCRIPTION("Sensirion SHT3x humidity and temperature sensor driver"); | |
775 | MODULE_LICENSE("GPL"); |