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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7f07ec0f | 2 | /* |
3 | * STTS751 sensor driver | |
4 | * | |
5 | * Copyright (C) 2016-2017 Istituto Italiano di Tecnologia - RBCS - EDL | |
6 | * Robotics, Brain and Cognitive Sciences department | |
7 | * Electronic Design Laboratory | |
8 | * | |
9 | * Written by Andrea Merello <andrea.merello@gmail.com> | |
10 | * | |
11 | * Based on LM95241 driver and LM90 driver | |
7f07ec0f | 12 | */ |
13 | ||
14 | #include <linux/bitops.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/hwmon.h> | |
17 | #include <linux/hwmon-sysfs.h> | |
18 | #include <linux/i2c.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/jiffies.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/mutex.h> | |
24 | #include <linux/property.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/sysfs.h> | |
27 | #include <linux/util_macros.h> | |
28 | ||
29 | #define DEVNAME "stts751" | |
30 | ||
31 | static const unsigned short normal_i2c[] = { | |
32 | 0x48, 0x49, 0x38, 0x39, /* STTS751-0 */ | |
33 | 0x4A, 0x4B, 0x3A, 0x3B, /* STTS751-1 */ | |
34 | I2C_CLIENT_END }; | |
35 | ||
36 | #define STTS751_REG_TEMP_H 0x00 | |
37 | #define STTS751_REG_STATUS 0x01 | |
38 | #define STTS751_STATUS_TRIPT BIT(0) | |
39 | #define STTS751_STATUS_TRIPL BIT(5) | |
40 | #define STTS751_STATUS_TRIPH BIT(6) | |
41 | #define STTS751_REG_TEMP_L 0x02 | |
42 | #define STTS751_REG_CONF 0x03 | |
43 | #define STTS751_CONF_RES_MASK 0x0C | |
44 | #define STTS751_CONF_RES_SHIFT 2 | |
45 | #define STTS751_CONF_EVENT_DIS BIT(7) | |
46 | #define STTS751_CONF_STOP BIT(6) | |
47 | #define STTS751_REG_RATE 0x04 | |
48 | #define STTS751_REG_HLIM_H 0x05 | |
49 | #define STTS751_REG_HLIM_L 0x06 | |
50 | #define STTS751_REG_LLIM_H 0x07 | |
51 | #define STTS751_REG_LLIM_L 0x08 | |
52 | #define STTS751_REG_TLIM 0x20 | |
53 | #define STTS751_REG_HYST 0x21 | |
54 | #define STTS751_REG_SMBUS_TO 0x22 | |
55 | ||
56 | #define STTS751_REG_PROD_ID 0xFD | |
57 | #define STTS751_REG_MAN_ID 0xFE | |
58 | #define STTS751_REG_REV_ID 0xFF | |
59 | ||
60 | #define STTS751_0_PROD_ID 0x00 | |
61 | #define STTS751_1_PROD_ID 0x01 | |
62 | #define ST_MAN_ID 0x53 | |
63 | ||
64 | /* | |
65 | * Possible update intervals are (in mS): | |
66 | * 16000, 8000, 4000, 2000, 1000, 500, 250, 125, 62.5, 31.25 | |
67 | * However we are not going to complicate things too much and we stick to the | |
68 | * approx value in mS. | |
69 | */ | |
70 | static const int stts751_intervals[] = { | |
71 | 16000, 8000, 4000, 2000, 1000, 500, 250, 125, 63, 31 | |
72 | }; | |
73 | ||
74 | static const struct i2c_device_id stts751_id[] = { | |
75 | { "stts751", 0 }, | |
76 | { } | |
77 | }; | |
78 | ||
1cbee124 | 79 | static const struct of_device_id __maybe_unused stts751_of_match[] = { |
1c1a7b75 JMC |
80 | { .compatible = "stts751" }, |
81 | { }, | |
82 | }; | |
83 | MODULE_DEVICE_TABLE(of, stts751_of_match); | |
84 | ||
7f07ec0f | 85 | struct stts751_priv { |
86 | struct device *dev; | |
87 | struct i2c_client *client; | |
88 | struct mutex access_lock; | |
89 | u8 interval; | |
90 | int res; | |
91 | int event_max, event_min; | |
92 | int therm; | |
93 | int hyst; | |
94 | bool smbus_timeout; | |
95 | int temp; | |
96 | unsigned long last_update, last_alert_update; | |
97 | u8 config; | |
98 | bool min_alert, max_alert, therm_trip; | |
99 | bool data_valid, alert_valid; | |
100 | bool notify_max, notify_min; | |
101 | }; | |
102 | ||
103 | /* | |
104 | * These functions converts temperature from HW format to integer format and | |
105 | * vice-vers. They are (mostly) taken from lm90 driver. Unit is in mC. | |
106 | */ | |
107 | static int stts751_to_deg(s16 hw_val) | |
108 | { | |
109 | return hw_val * 125 / 32; | |
110 | } | |
111 | ||
112 | static s32 stts751_to_hw(int val) | |
113 | { | |
114 | return DIV_ROUND_CLOSEST(val, 125) * 32; | |
115 | } | |
116 | ||
117 | static int stts751_adjust_resolution(struct stts751_priv *priv) | |
118 | { | |
119 | u8 res; | |
120 | ||
121 | switch (priv->interval) { | |
122 | case 9: | |
123 | /* 10 bits */ | |
124 | res = 0; | |
125 | break; | |
126 | case 8: | |
127 | /* 11 bits */ | |
128 | res = 1; | |
129 | break; | |
130 | default: | |
131 | /* 12 bits */ | |
132 | res = 3; | |
133 | break; | |
134 | } | |
135 | ||
136 | if (priv->res == res) | |
137 | return 0; | |
138 | ||
139 | priv->config &= ~STTS751_CONF_RES_MASK; | |
140 | priv->config |= res << STTS751_CONF_RES_SHIFT; | |
141 | dev_dbg(&priv->client->dev, "setting res %d. config %x", | |
142 | res, priv->config); | |
143 | priv->res = res; | |
144 | ||
145 | return i2c_smbus_write_byte_data(priv->client, | |
146 | STTS751_REG_CONF, priv->config); | |
147 | } | |
148 | ||
149 | static int stts751_update_temp(struct stts751_priv *priv) | |
150 | { | |
151 | s32 integer1, integer2, frac; | |
152 | ||
153 | /* | |
154 | * There is a trick here, like in the lm90 driver. We have to read two | |
155 | * registers to get the sensor temperature, but we have to beware a | |
156 | * conversion could occur between the readings. We could use the | |
157 | * one-shot conversion register, but we don't want to do this (disables | |
158 | * hardware monitoring). So the solution used here is to read the high | |
159 | * byte once, then the low byte, then the high byte again. If the new | |
160 | * high byte matches the old one, then we have a valid reading. Else we | |
161 | * have to read the low byte again, and now we believe we have a correct | |
162 | * reading. | |
163 | */ | |
164 | integer1 = i2c_smbus_read_byte_data(priv->client, STTS751_REG_TEMP_H); | |
165 | if (integer1 < 0) { | |
166 | dev_dbg(&priv->client->dev, | |
167 | "I2C read failed (temp H). ret: %x\n", integer1); | |
168 | return integer1; | |
169 | } | |
170 | ||
171 | frac = i2c_smbus_read_byte_data(priv->client, STTS751_REG_TEMP_L); | |
172 | if (frac < 0) { | |
173 | dev_dbg(&priv->client->dev, | |
174 | "I2C read failed (temp L). ret: %x\n", frac); | |
175 | return frac; | |
176 | } | |
177 | ||
178 | integer2 = i2c_smbus_read_byte_data(priv->client, STTS751_REG_TEMP_H); | |
179 | if (integer2 < 0) { | |
180 | dev_dbg(&priv->client->dev, | |
181 | "I2C 2nd read failed (temp H). ret: %x\n", integer2); | |
182 | return integer2; | |
183 | } | |
184 | ||
185 | if (integer1 != integer2) { | |
186 | frac = i2c_smbus_read_byte_data(priv->client, | |
187 | STTS751_REG_TEMP_L); | |
188 | if (frac < 0) { | |
189 | dev_dbg(&priv->client->dev, | |
190 | "I2C 2nd read failed (temp L). ret: %x\n", | |
191 | frac); | |
192 | return frac; | |
193 | } | |
194 | } | |
195 | ||
196 | priv->temp = stts751_to_deg((integer1 << 8) | frac); | |
197 | return 0; | |
198 | } | |
199 | ||
200 | static int stts751_set_temp_reg16(struct stts751_priv *priv, int temp, | |
201 | u8 hreg, u8 lreg) | |
202 | { | |
203 | s32 hwval; | |
204 | int ret; | |
205 | ||
206 | hwval = stts751_to_hw(temp); | |
207 | ||
208 | ret = i2c_smbus_write_byte_data(priv->client, hreg, hwval >> 8); | |
209 | if (ret) | |
210 | return ret; | |
211 | ||
212 | return i2c_smbus_write_byte_data(priv->client, lreg, hwval & 0xff); | |
213 | } | |
214 | ||
215 | static int stts751_set_temp_reg8(struct stts751_priv *priv, int temp, u8 reg) | |
216 | { | |
217 | s32 hwval; | |
218 | ||
219 | hwval = stts751_to_hw(temp); | |
220 | return i2c_smbus_write_byte_data(priv->client, reg, hwval >> 8); | |
221 | } | |
222 | ||
223 | static int stts751_read_reg16(struct stts751_priv *priv, int *temp, | |
224 | u8 hreg, u8 lreg) | |
225 | { | |
226 | int integer, frac; | |
227 | ||
228 | integer = i2c_smbus_read_byte_data(priv->client, hreg); | |
229 | if (integer < 0) | |
230 | return integer; | |
231 | ||
232 | frac = i2c_smbus_read_byte_data(priv->client, lreg); | |
233 | if (frac < 0) | |
234 | return frac; | |
235 | ||
236 | *temp = stts751_to_deg((integer << 8) | frac); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static int stts751_read_reg8(struct stts751_priv *priv, int *temp, u8 reg) | |
242 | { | |
243 | int integer; | |
244 | ||
245 | integer = i2c_smbus_read_byte_data(priv->client, reg); | |
246 | if (integer < 0) | |
247 | return integer; | |
248 | ||
249 | *temp = stts751_to_deg(integer << 8); | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | /* | |
255 | * Update alert flags without waiting for cache to expire. We detects alerts | |
256 | * immediately for the sake of the alert handler; we still need to deal with | |
257 | * caching to workaround the fact that alarm flags int the status register, | |
258 | * despite what the datasheet claims, gets always cleared on read. | |
259 | */ | |
260 | static int stts751_update_alert(struct stts751_priv *priv) | |
261 | { | |
262 | int ret; | |
263 | bool conv_done; | |
264 | int cache_time = msecs_to_jiffies(stts751_intervals[priv->interval]); | |
265 | ||
266 | /* | |
267 | * Add another 10% because if we run faster than the HW conversion | |
268 | * rate we will end up in reporting incorrectly alarms. | |
269 | */ | |
270 | cache_time += cache_time / 10; | |
271 | ||
272 | ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_STATUS); | |
273 | if (ret < 0) | |
274 | return ret; | |
275 | ||
276 | dev_dbg(&priv->client->dev, "status reg %x\n", ret); | |
277 | conv_done = ret & (STTS751_STATUS_TRIPH | STTS751_STATUS_TRIPL); | |
278 | /* | |
279 | * Reset the cache if the cache time expired, or if we are sure | |
280 | * we have valid data from a device conversion, or if we know | |
281 | * our cache has been never written. | |
282 | * | |
283 | * Note that when the cache has been never written the point is | |
284 | * to correctly initialize the timestamp, rather than clearing | |
285 | * the cache values. | |
286 | * | |
287 | * Note that updating the cache timestamp when we get an alarm flag | |
288 | * is required, otherwise we could incorrectly report alarms to be zero. | |
289 | */ | |
290 | if (time_after(jiffies, priv->last_alert_update + cache_time) || | |
291 | conv_done || !priv->alert_valid) { | |
292 | priv->max_alert = false; | |
293 | priv->min_alert = false; | |
294 | priv->alert_valid = true; | |
295 | priv->last_alert_update = jiffies; | |
296 | dev_dbg(&priv->client->dev, "invalidating alert cache\n"); | |
297 | } | |
298 | ||
299 | priv->max_alert |= !!(ret & STTS751_STATUS_TRIPH); | |
300 | priv->min_alert |= !!(ret & STTS751_STATUS_TRIPL); | |
301 | priv->therm_trip = !!(ret & STTS751_STATUS_TRIPT); | |
302 | ||
303 | dev_dbg(&priv->client->dev, "max_alert: %d, min_alert: %d, therm_trip: %d\n", | |
304 | priv->max_alert, priv->min_alert, priv->therm_trip); | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static void stts751_alert(struct i2c_client *client, | |
310 | enum i2c_alert_protocol type, unsigned int data) | |
311 | { | |
312 | int ret; | |
313 | struct stts751_priv *priv = i2c_get_clientdata(client); | |
314 | ||
315 | if (type != I2C_PROTOCOL_SMBUS_ALERT) | |
316 | return; | |
317 | ||
318 | dev_dbg(&client->dev, "alert!"); | |
319 | ||
320 | mutex_lock(&priv->access_lock); | |
321 | ret = stts751_update_alert(priv); | |
322 | if (ret < 0) { | |
323 | /* default to worst case */ | |
324 | priv->max_alert = true; | |
325 | priv->min_alert = true; | |
326 | ||
327 | dev_warn(priv->dev, | |
328 | "Alert received, but can't communicate to the device. Triggering all alarms!"); | |
329 | } | |
330 | ||
331 | if (priv->max_alert) { | |
332 | if (priv->notify_max) | |
333 | dev_notice(priv->dev, "got alert for HIGH temperature"); | |
334 | priv->notify_max = false; | |
335 | ||
336 | /* unblock alert poll */ | |
337 | sysfs_notify(&priv->dev->kobj, NULL, "temp1_max_alarm"); | |
338 | } | |
339 | ||
340 | if (priv->min_alert) { | |
341 | if (priv->notify_min) | |
342 | dev_notice(priv->dev, "got alert for LOW temperature"); | |
343 | priv->notify_min = false; | |
344 | ||
345 | /* unblock alert poll */ | |
346 | sysfs_notify(&priv->dev->kobj, NULL, "temp1_min_alarm"); | |
347 | } | |
348 | ||
349 | if (priv->min_alert || priv->max_alert) | |
350 | kobject_uevent(&priv->dev->kobj, KOBJ_CHANGE); | |
351 | ||
352 | mutex_unlock(&priv->access_lock); | |
353 | } | |
354 | ||
355 | static int stts751_update(struct stts751_priv *priv) | |
356 | { | |
357 | int ret; | |
358 | int cache_time = msecs_to_jiffies(stts751_intervals[priv->interval]); | |
359 | ||
360 | if (time_after(jiffies, priv->last_update + cache_time) || | |
361 | !priv->data_valid) { | |
362 | ret = stts751_update_temp(priv); | |
363 | if (ret) | |
364 | return ret; | |
365 | ||
366 | ret = stts751_update_alert(priv); | |
367 | if (ret) | |
368 | return ret; | |
369 | priv->data_valid = true; | |
370 | priv->last_update = jiffies; | |
371 | } | |
372 | ||
373 | return 0; | |
374 | } | |
375 | ||
ecd52d7b GR |
376 | static ssize_t max_alarm_show(struct device *dev, |
377 | struct device_attribute *attr, char *buf) | |
7f07ec0f | 378 | { |
379 | int ret; | |
380 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
381 | ||
382 | mutex_lock(&priv->access_lock); | |
383 | ret = stts751_update(priv); | |
384 | if (!ret) | |
385 | priv->notify_max = true; | |
386 | mutex_unlock(&priv->access_lock); | |
387 | if (ret < 0) | |
388 | return ret; | |
389 | ||
1f4d4af4 | 390 | return sysfs_emit(buf, "%d\n", priv->max_alert); |
7f07ec0f | 391 | } |
392 | ||
ecd52d7b GR |
393 | static ssize_t min_alarm_show(struct device *dev, |
394 | struct device_attribute *attr, char *buf) | |
7f07ec0f | 395 | { |
396 | int ret; | |
397 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
398 | ||
399 | mutex_lock(&priv->access_lock); | |
400 | ret = stts751_update(priv); | |
401 | if (!ret) | |
402 | priv->notify_min = true; | |
403 | mutex_unlock(&priv->access_lock); | |
404 | if (ret < 0) | |
405 | return ret; | |
406 | ||
1f4d4af4 | 407 | return sysfs_emit(buf, "%d\n", priv->min_alert); |
7f07ec0f | 408 | } |
409 | ||
ecd52d7b | 410 | static ssize_t input_show(struct device *dev, struct device_attribute *attr, |
7f07ec0f | 411 | char *buf) |
412 | { | |
413 | int ret; | |
414 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
415 | ||
416 | mutex_lock(&priv->access_lock); | |
417 | ret = stts751_update(priv); | |
418 | mutex_unlock(&priv->access_lock); | |
419 | if (ret < 0) | |
420 | return ret; | |
421 | ||
1f4d4af4 | 422 | return sysfs_emit(buf, "%d\n", priv->temp); |
7f07ec0f | 423 | } |
424 | ||
ecd52d7b | 425 | static ssize_t therm_show(struct device *dev, struct device_attribute *attr, |
7f07ec0f | 426 | char *buf) |
427 | { | |
428 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
429 | ||
1f4d4af4 | 430 | return sysfs_emit(buf, "%d\n", priv->therm); |
7f07ec0f | 431 | } |
432 | ||
ecd52d7b GR |
433 | static ssize_t therm_store(struct device *dev, struct device_attribute *attr, |
434 | const char *buf, size_t count) | |
7f07ec0f | 435 | { |
436 | int ret; | |
437 | long temp; | |
438 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
439 | ||
440 | if (kstrtol(buf, 10, &temp) < 0) | |
441 | return -EINVAL; | |
442 | ||
443 | /* HW works in range -64C to +127.937C */ | |
444 | temp = clamp_val(temp, -64000, 127937); | |
445 | mutex_lock(&priv->access_lock); | |
446 | ret = stts751_set_temp_reg8(priv, temp, STTS751_REG_TLIM); | |
447 | if (ret) | |
448 | goto exit; | |
449 | ||
450 | dev_dbg(&priv->client->dev, "setting therm %ld", temp); | |
451 | ||
452 | /* | |
453 | * hysteresis reg is relative to therm, so the HW does not need to be | |
454 | * adjusted, we need to update our local copy only. | |
455 | */ | |
456 | priv->hyst = temp - (priv->therm - priv->hyst); | |
457 | priv->therm = temp; | |
458 | ||
459 | exit: | |
460 | mutex_unlock(&priv->access_lock); | |
461 | if (ret) | |
462 | return ret; | |
463 | ||
464 | return count; | |
465 | } | |
466 | ||
ecd52d7b | 467 | static ssize_t hyst_show(struct device *dev, struct device_attribute *attr, |
7f07ec0f | 468 | char *buf) |
469 | { | |
470 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
471 | ||
1f4d4af4 | 472 | return sysfs_emit(buf, "%d\n", priv->hyst); |
7f07ec0f | 473 | } |
474 | ||
ecd52d7b GR |
475 | static ssize_t hyst_store(struct device *dev, struct device_attribute *attr, |
476 | const char *buf, size_t count) | |
7f07ec0f | 477 | { |
478 | int ret; | |
479 | long temp; | |
480 | ||
481 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
482 | ||
483 | if (kstrtol(buf, 10, &temp) < 0) | |
484 | return -EINVAL; | |
485 | ||
486 | mutex_lock(&priv->access_lock); | |
487 | /* HW works in range -64C to +127.937C */ | |
488 | temp = clamp_val(temp, -64000, priv->therm); | |
489 | priv->hyst = temp; | |
490 | dev_dbg(&priv->client->dev, "setting hyst %ld", temp); | |
491 | temp = priv->therm - temp; | |
492 | ret = stts751_set_temp_reg8(priv, temp, STTS751_REG_HYST); | |
493 | mutex_unlock(&priv->access_lock); | |
494 | if (ret) | |
495 | return ret; | |
496 | ||
497 | return count; | |
498 | } | |
499 | ||
ecd52d7b | 500 | static ssize_t therm_trip_show(struct device *dev, |
7f07ec0f | 501 | struct device_attribute *attr, char *buf) |
502 | { | |
503 | int ret; | |
504 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
505 | ||
506 | mutex_lock(&priv->access_lock); | |
507 | ret = stts751_update(priv); | |
508 | mutex_unlock(&priv->access_lock); | |
509 | if (ret < 0) | |
510 | return ret; | |
511 | ||
1f4d4af4 | 512 | return sysfs_emit(buf, "%d\n", priv->therm_trip); |
7f07ec0f | 513 | } |
514 | ||
ecd52d7b | 515 | static ssize_t max_show(struct device *dev, struct device_attribute *attr, |
7f07ec0f | 516 | char *buf) |
517 | { | |
518 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
519 | ||
1f4d4af4 | 520 | return sysfs_emit(buf, "%d\n", priv->event_max); |
7f07ec0f | 521 | } |
522 | ||
ecd52d7b GR |
523 | static ssize_t max_store(struct device *dev, struct device_attribute *attr, |
524 | const char *buf, size_t count) | |
7f07ec0f | 525 | { |
526 | int ret; | |
527 | long temp; | |
528 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
529 | ||
530 | if (kstrtol(buf, 10, &temp) < 0) | |
531 | return -EINVAL; | |
532 | ||
533 | mutex_lock(&priv->access_lock); | |
534 | /* HW works in range -64C to +127.937C */ | |
535 | temp = clamp_val(temp, priv->event_min, 127937); | |
536 | ret = stts751_set_temp_reg16(priv, temp, | |
537 | STTS751_REG_HLIM_H, STTS751_REG_HLIM_L); | |
538 | if (ret) | |
539 | goto exit; | |
540 | ||
541 | dev_dbg(&priv->client->dev, "setting event max %ld", temp); | |
542 | priv->event_max = temp; | |
543 | ret = count; | |
544 | exit: | |
545 | mutex_unlock(&priv->access_lock); | |
546 | return ret; | |
547 | } | |
548 | ||
ecd52d7b | 549 | static ssize_t min_show(struct device *dev, struct device_attribute *attr, |
7f07ec0f | 550 | char *buf) |
551 | { | |
552 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
553 | ||
1f4d4af4 | 554 | return sysfs_emit(buf, "%d\n", priv->event_min); |
7f07ec0f | 555 | } |
556 | ||
ecd52d7b GR |
557 | static ssize_t min_store(struct device *dev, struct device_attribute *attr, |
558 | const char *buf, size_t count) | |
7f07ec0f | 559 | { |
560 | int ret; | |
561 | long temp; | |
562 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
563 | ||
564 | if (kstrtol(buf, 10, &temp) < 0) | |
565 | return -EINVAL; | |
566 | ||
567 | mutex_lock(&priv->access_lock); | |
568 | /* HW works in range -64C to +127.937C */ | |
569 | temp = clamp_val(temp, -64000, priv->event_max); | |
570 | ret = stts751_set_temp_reg16(priv, temp, | |
571 | STTS751_REG_LLIM_H, STTS751_REG_LLIM_L); | |
572 | if (ret) | |
573 | goto exit; | |
574 | ||
575 | dev_dbg(&priv->client->dev, "setting event min %ld", temp); | |
576 | priv->event_min = temp; | |
577 | ret = count; | |
578 | exit: | |
579 | mutex_unlock(&priv->access_lock); | |
580 | return ret; | |
581 | } | |
582 | ||
ecd52d7b GR |
583 | static ssize_t interval_show(struct device *dev, |
584 | struct device_attribute *attr, char *buf) | |
7f07ec0f | 585 | { |
586 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
587 | ||
1f4d4af4 GR |
588 | return sysfs_emit(buf, "%d\n", |
589 | stts751_intervals[priv->interval]); | |
7f07ec0f | 590 | } |
591 | ||
ecd52d7b GR |
592 | static ssize_t interval_store(struct device *dev, |
593 | struct device_attribute *attr, const char *buf, | |
594 | size_t count) | |
7f07ec0f | 595 | { |
596 | unsigned long val; | |
597 | int idx; | |
598 | int ret = count; | |
599 | struct stts751_priv *priv = dev_get_drvdata(dev); | |
600 | ||
601 | if (kstrtoul(buf, 10, &val) < 0) | |
602 | return -EINVAL; | |
603 | ||
604 | idx = find_closest_descending(val, stts751_intervals, | |
605 | ARRAY_SIZE(stts751_intervals)); | |
606 | ||
607 | dev_dbg(&priv->client->dev, "setting interval. req:%lu, idx: %d, val: %d", | |
608 | val, idx, stts751_intervals[idx]); | |
609 | ||
610 | mutex_lock(&priv->access_lock); | |
611 | if (priv->interval == idx) | |
612 | goto exit; | |
613 | ||
614 | /* | |
615 | * In early development stages I've become suspicious about the chip | |
616 | * starting to misbehave if I ever set, even briefly, an invalid | |
617 | * configuration. While I'm not sure this is really needed, be | |
618 | * conservative and set rate/resolution in such an order that avoids | |
619 | * passing through an invalid configuration. | |
620 | */ | |
621 | ||
622 | /* speed up: lower the resolution, then modify convrate */ | |
623 | if (priv->interval < idx) { | |
624 | dev_dbg(&priv->client->dev, "lower resolution, then modify convrate"); | |
625 | priv->interval = idx; | |
626 | ret = stts751_adjust_resolution(priv); | |
627 | if (ret) | |
628 | goto exit; | |
629 | } | |
630 | ||
631 | ret = i2c_smbus_write_byte_data(priv->client, STTS751_REG_RATE, idx); | |
632 | if (ret) | |
633 | goto exit; | |
634 | /* slow down: modify convrate, then raise resolution */ | |
635 | if (priv->interval != idx) { | |
636 | dev_dbg(&priv->client->dev, "modify convrate, then raise resolution"); | |
637 | priv->interval = idx; | |
638 | ret = stts751_adjust_resolution(priv); | |
639 | if (ret) | |
640 | goto exit; | |
641 | } | |
642 | ret = count; | |
643 | exit: | |
644 | mutex_unlock(&priv->access_lock); | |
645 | ||
646 | return ret; | |
647 | } | |
648 | ||
649 | static int stts751_detect(struct i2c_client *new_client, | |
650 | struct i2c_board_info *info) | |
651 | { | |
652 | struct i2c_adapter *adapter = new_client->adapter; | |
653 | const char *name; | |
654 | int tmp; | |
655 | ||
656 | if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) | |
657 | return -ENODEV; | |
658 | ||
659 | tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_MAN_ID); | |
660 | if (tmp != ST_MAN_ID) | |
661 | return -ENODEV; | |
662 | ||
663 | /* lower temperaure registers always have bits 0-3 set to zero */ | |
664 | tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_TEMP_L); | |
665 | if (tmp & 0xf) | |
666 | return -ENODEV; | |
667 | ||
668 | tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_HLIM_L); | |
669 | if (tmp & 0xf) | |
670 | return -ENODEV; | |
671 | ||
672 | tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_LLIM_L); | |
673 | if (tmp & 0xf) | |
674 | return -ENODEV; | |
675 | ||
676 | /* smbus timeout register always have bits 0-7 set to zero */ | |
677 | tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_SMBUS_TO); | |
678 | if (tmp & 0x7f) | |
679 | return -ENODEV; | |
680 | ||
681 | tmp = i2c_smbus_read_byte_data(new_client, STTS751_REG_PROD_ID); | |
682 | ||
683 | switch (tmp) { | |
684 | case STTS751_0_PROD_ID: | |
685 | name = "STTS751-0"; | |
686 | break; | |
687 | case STTS751_1_PROD_ID: | |
688 | name = "STTS751-1"; | |
689 | break; | |
690 | default: | |
691 | return -ENODEV; | |
692 | } | |
693 | dev_dbg(&new_client->dev, "Chip %s detected", name); | |
694 | ||
f2f394db | 695 | strscpy(info->type, stts751_id[0].name, I2C_NAME_SIZE); |
7f07ec0f | 696 | return 0; |
697 | } | |
698 | ||
699 | static int stts751_read_chip_config(struct stts751_priv *priv) | |
700 | { | |
701 | int ret; | |
702 | int tmp; | |
703 | ||
704 | ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_CONF); | |
705 | if (ret < 0) | |
706 | return ret; | |
707 | priv->config = ret; | |
708 | priv->res = (ret & STTS751_CONF_RES_MASK) >> STTS751_CONF_RES_SHIFT; | |
709 | ||
710 | ret = i2c_smbus_read_byte_data(priv->client, STTS751_REG_RATE); | |
711 | if (ret < 0) | |
712 | return ret; | |
3be6bd69 AV |
713 | if (ret >= ARRAY_SIZE(stts751_intervals)) { |
714 | dev_err(priv->dev, "Unrecognized conversion rate 0x%x\n", ret); | |
715 | return -ENODEV; | |
716 | } | |
7f07ec0f | 717 | priv->interval = ret; |
718 | ||
719 | ret = stts751_read_reg16(priv, &priv->event_max, | |
720 | STTS751_REG_HLIM_H, STTS751_REG_HLIM_L); | |
721 | if (ret) | |
722 | return ret; | |
723 | ||
724 | ret = stts751_read_reg16(priv, &priv->event_min, | |
725 | STTS751_REG_LLIM_H, STTS751_REG_LLIM_L); | |
726 | if (ret) | |
727 | return ret; | |
728 | ||
729 | ret = stts751_read_reg8(priv, &priv->therm, STTS751_REG_TLIM); | |
730 | if (ret) | |
731 | return ret; | |
732 | ||
733 | ret = stts751_read_reg8(priv, &tmp, STTS751_REG_HYST); | |
734 | if (ret) | |
735 | return ret; | |
736 | priv->hyst = priv->therm - tmp; | |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
ecd52d7b GR |
741 | static SENSOR_DEVICE_ATTR_RO(temp1_input, input, 0); |
742 | static SENSOR_DEVICE_ATTR_RW(temp1_min, min, 0); | |
743 | static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0); | |
744 | static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, min_alarm, 0); | |
745 | static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, max_alarm, 0); | |
746 | static SENSOR_DEVICE_ATTR_RW(temp1_crit, therm, 0); | |
747 | static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, hyst, 0); | |
748 | static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, therm_trip, 0); | |
749 | static SENSOR_DEVICE_ATTR_RW(update_interval, interval, 0); | |
7f07ec0f | 750 | |
751 | static struct attribute *stts751_attrs[] = { | |
752 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
753 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
754 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
755 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
756 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
757 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
758 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
759 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
760 | &sensor_dev_attr_update_interval.dev_attr.attr, | |
761 | NULL | |
762 | }; | |
763 | ATTRIBUTE_GROUPS(stts751); | |
764 | ||
67487038 | 765 | static int stts751_probe(struct i2c_client *client) |
7f07ec0f | 766 | { |
767 | struct stts751_priv *priv; | |
768 | int ret; | |
769 | bool smbus_nto; | |
770 | int rev_id; | |
771 | ||
772 | priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL); | |
773 | if (!priv) | |
774 | return -ENOMEM; | |
775 | ||
776 | priv->client = client; | |
777 | priv->notify_max = true; | |
778 | priv->notify_min = true; | |
779 | i2c_set_clientdata(client, priv); | |
780 | mutex_init(&priv->access_lock); | |
781 | ||
782 | if (device_property_present(&client->dev, | |
783 | "smbus-timeout-disable")) { | |
784 | smbus_nto = device_property_read_bool(&client->dev, | |
785 | "smbus-timeout-disable"); | |
786 | ||
787 | ret = i2c_smbus_write_byte_data(client, STTS751_REG_SMBUS_TO, | |
788 | smbus_nto ? 0 : 0x80); | |
789 | if (ret) | |
790 | return ret; | |
791 | } | |
792 | ||
793 | rev_id = i2c_smbus_read_byte_data(client, STTS751_REG_REV_ID); | |
794 | if (rev_id < 0) | |
795 | return -ENODEV; | |
796 | if (rev_id != 0x1) { | |
797 | dev_dbg(&client->dev, "Chip revision 0x%x is untested\n", | |
798 | rev_id); | |
799 | } | |
800 | ||
801 | ret = stts751_read_chip_config(priv); | |
802 | if (ret) | |
803 | return ret; | |
804 | ||
805 | priv->config &= ~(STTS751_CONF_STOP | STTS751_CONF_EVENT_DIS); | |
806 | ret = i2c_smbus_write_byte_data(client, STTS751_REG_CONF, priv->config); | |
807 | if (ret) | |
808 | return ret; | |
809 | ||
810 | priv->dev = devm_hwmon_device_register_with_groups(&client->dev, | |
811 | client->name, priv, | |
812 | stts751_groups); | |
813 | return PTR_ERR_OR_ZERO(priv->dev); | |
814 | } | |
815 | ||
816 | MODULE_DEVICE_TABLE(i2c, stts751_id); | |
817 | ||
818 | static struct i2c_driver stts751_driver = { | |
819 | .class = I2C_CLASS_HWMON, | |
820 | .driver = { | |
821 | .name = DEVNAME, | |
1c1a7b75 | 822 | .of_match_table = of_match_ptr(stts751_of_match), |
7f07ec0f | 823 | }, |
1975d167 | 824 | .probe = stts751_probe, |
7f07ec0f | 825 | .id_table = stts751_id, |
826 | .detect = stts751_detect, | |
827 | .alert = stts751_alert, | |
828 | .address_list = normal_i2c, | |
829 | }; | |
830 | ||
831 | module_i2c_driver(stts751_driver); | |
832 | ||
833 | MODULE_AUTHOR("Andrea Merello <andrea.merello@gmail.com>"); | |
834 | MODULE_DESCRIPTION("STTS751 sensor driver"); | |
835 | MODULE_LICENSE("GPL"); |