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983b97be HK |
1 | /* |
2 | * adt7410.c - Part of lm_sensors, Linux kernel modules for hardware | |
3 | * monitoring | |
4 | * This driver handles the ADT7410 and compatible digital temperature sensors. | |
5 | * Hartmut Knaack <knaack.h@gmx.de> 2012-07-22 | |
6 | * based on lm75.c by Frodo Looijaard <frodol@dds.nl> | |
7 | * and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.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 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/jiffies.h> | |
28 | #include <linux/i2c.h> | |
29 | #include <linux/hwmon.h> | |
30 | #include <linux/hwmon-sysfs.h> | |
31 | #include <linux/err.h> | |
32 | #include <linux/mutex.h> | |
33 | #include <linux/delay.h> | |
34 | ||
35 | /* | |
36 | * ADT7410 registers definition | |
37 | */ | |
38 | ||
39 | #define ADT7410_TEMPERATURE 0 | |
40 | #define ADT7410_STATUS 2 | |
41 | #define ADT7410_CONFIG 3 | |
42 | #define ADT7410_T_ALARM_HIGH 4 | |
43 | #define ADT7410_T_ALARM_LOW 6 | |
44 | #define ADT7410_T_CRIT 8 | |
45 | #define ADT7410_T_HYST 0xA | |
46 | ||
47 | /* | |
48 | * ADT7410 status | |
49 | */ | |
50 | #define ADT7410_STAT_T_LOW (1 << 4) | |
51 | #define ADT7410_STAT_T_HIGH (1 << 5) | |
52 | #define ADT7410_STAT_T_CRIT (1 << 6) | |
53 | #define ADT7410_STAT_NOT_RDY (1 << 7) | |
54 | ||
55 | /* | |
56 | * ADT7410 config | |
57 | */ | |
58 | #define ADT7410_FAULT_QUEUE_MASK (1 << 0 | 1 << 1) | |
59 | #define ADT7410_CT_POLARITY (1 << 2) | |
60 | #define ADT7410_INT_POLARITY (1 << 3) | |
61 | #define ADT7410_EVENT_MODE (1 << 4) | |
62 | #define ADT7410_MODE_MASK (1 << 5 | 1 << 6) | |
63 | #define ADT7410_FULL (0 << 5 | 0 << 6) | |
64 | #define ADT7410_PD (1 << 5 | 1 << 6) | |
65 | #define ADT7410_RESOLUTION (1 << 7) | |
66 | ||
67 | /* | |
68 | * ADT7410 masks | |
69 | */ | |
70 | #define ADT7410_T13_VALUE_MASK 0xFFF8 | |
71 | #define ADT7410_T_HYST_MASK 0xF | |
72 | ||
73 | /* straight from the datasheet */ | |
74 | #define ADT7410_TEMP_MIN (-55000) | |
75 | #define ADT7410_TEMP_MAX 150000 | |
76 | ||
77 | enum adt7410_type { /* keep sorted in alphabetical order */ | |
78 | adt7410, | |
79 | }; | |
80 | ||
983b97be HK |
81 | static const u8 ADT7410_REG_TEMP[4] = { |
82 | ADT7410_TEMPERATURE, /* input */ | |
83 | ADT7410_T_ALARM_HIGH, /* high */ | |
84 | ADT7410_T_ALARM_LOW, /* low */ | |
85 | ADT7410_T_CRIT, /* critical */ | |
86 | }; | |
87 | ||
88 | /* Each client has this additional data */ | |
89 | struct adt7410_data { | |
90 | struct device *hwmon_dev; | |
91 | struct mutex update_lock; | |
92 | u8 config; | |
93 | u8 oldconfig; | |
94 | bool valid; /* true if registers valid */ | |
95 | unsigned long last_updated; /* In jiffies */ | |
96 | s16 temp[4]; /* Register values, | |
97 | 0 = input | |
98 | 1 = high | |
99 | 2 = low | |
100 | 3 = critical */ | |
101 | u8 hyst; /* hysteresis offset */ | |
102 | }; | |
103 | ||
104 | /* | |
105 | * adt7410 register access by I2C | |
106 | */ | |
107 | static int adt7410_temp_ready(struct i2c_client *client) | |
108 | { | |
109 | int i, status; | |
110 | ||
111 | for (i = 0; i < 6; i++) { | |
112 | status = i2c_smbus_read_byte_data(client, ADT7410_STATUS); | |
113 | if (status < 0) | |
114 | return status; | |
115 | if (!(status & ADT7410_STAT_NOT_RDY)) | |
116 | return 0; | |
117 | msleep(60); | |
118 | } | |
119 | return -ETIMEDOUT; | |
120 | } | |
121 | ||
c55dc91e | 122 | static int adt7410_update_temp(struct device *dev) |
983b97be HK |
123 | { |
124 | struct i2c_client *client = to_i2c_client(dev); | |
125 | struct adt7410_data *data = i2c_get_clientdata(client); | |
c55dc91e LPC |
126 | int ret = 0; |
127 | ||
983b97be HK |
128 | mutex_lock(&data->update_lock); |
129 | ||
130 | if (time_after(jiffies, data->last_updated + HZ + HZ / 2) | |
131 | || !data->valid) { | |
c55dc91e | 132 | int temp; |
983b97be HK |
133 | |
134 | dev_dbg(&client->dev, "Starting update\n"); | |
135 | ||
c55dc91e LPC |
136 | ret = adt7410_temp_ready(client); /* check for new value */ |
137 | if (ret) | |
983b97be | 138 | goto abort; |
c55dc91e LPC |
139 | |
140 | temp = i2c_smbus_read_word_swapped(client, ADT7410_REG_TEMP[0]); | |
141 | if (temp < 0) { | |
142 | ret = temp; | |
143 | dev_dbg(dev, "Failed to read value: reg %d, error %d\n", | |
144 | ADT7410_REG_TEMP[0], ret); | |
983b97be HK |
145 | goto abort; |
146 | } | |
c55dc91e LPC |
147 | data->temp[0] = temp; |
148 | ||
983b97be HK |
149 | data->last_updated = jiffies; |
150 | data->valid = true; | |
151 | } | |
152 | ||
153 | abort: | |
154 | mutex_unlock(&data->update_lock); | |
155 | return ret; | |
156 | } | |
157 | ||
c55dc91e LPC |
158 | static int adt7410_fill_cache(struct i2c_client *client) |
159 | { | |
160 | struct adt7410_data *data = i2c_get_clientdata(client); | |
161 | int ret; | |
162 | int i; | |
163 | ||
164 | for (i = 1; i < ARRAY_SIZE(ADT7410_REG_TEMP); i++) { | |
165 | ret = i2c_smbus_read_word_swapped(client, ADT7410_REG_TEMP[i]); | |
166 | if (ret < 0) { | |
167 | dev_dbg(&client->dev, | |
168 | "Failed to read value: reg %d, error %d\n", | |
169 | ADT7410_REG_TEMP[i], ret); | |
170 | return ret; | |
171 | } | |
172 | data->temp[i] = ret; | |
173 | } | |
174 | ||
175 | ret = i2c_smbus_read_byte_data(client, ADT7410_T_HYST); | |
176 | if (ret < 0) { | |
177 | dev_dbg(&client->dev, | |
178 | "Failed to read value: hyst reg, error %d\n", | |
179 | ret); | |
180 | return ret; | |
181 | } | |
182 | data->hyst = ret; | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
983b97be HK |
187 | static s16 ADT7410_TEMP_TO_REG(long temp) |
188 | { | |
2a844c14 GR |
189 | return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7410_TEMP_MIN, |
190 | ADT7410_TEMP_MAX) * 128, 1000); | |
983b97be HK |
191 | } |
192 | ||
193 | static int ADT7410_REG_TO_TEMP(struct adt7410_data *data, s16 reg) | |
194 | { | |
195 | /* in 13 bit mode, bits 0-2 are status flags - mask them out */ | |
196 | if (!(data->config & ADT7410_RESOLUTION)) | |
197 | reg &= ADT7410_T13_VALUE_MASK; | |
198 | /* | |
199 | * temperature is stored in twos complement format, in steps of | |
200 | * 1/128°C | |
201 | */ | |
202 | return DIV_ROUND_CLOSEST(reg * 1000, 128); | |
203 | } | |
204 | ||
205 | /*-----------------------------------------------------------------------*/ | |
206 | ||
207 | /* sysfs attributes for hwmon */ | |
208 | ||
209 | static ssize_t adt7410_show_temp(struct device *dev, | |
210 | struct device_attribute *da, char *buf) | |
211 | { | |
212 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
c55dc91e LPC |
213 | struct i2c_client *client = to_i2c_client(dev); |
214 | struct adt7410_data *data = i2c_get_clientdata(client); | |
983b97be | 215 | |
c55dc91e LPC |
216 | if (attr->index == 0) { |
217 | int ret; | |
218 | ||
219 | ret = adt7410_update_temp(dev); | |
220 | if (ret) | |
221 | return ret; | |
222 | } | |
983b97be HK |
223 | |
224 | return sprintf(buf, "%d\n", ADT7410_REG_TO_TEMP(data, | |
225 | data->temp[attr->index])); | |
226 | } | |
227 | ||
228 | static ssize_t adt7410_set_temp(struct device *dev, | |
229 | struct device_attribute *da, | |
230 | const char *buf, size_t count) | |
231 | { | |
232 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
233 | struct i2c_client *client = to_i2c_client(dev); | |
234 | struct adt7410_data *data = i2c_get_clientdata(client); | |
235 | int nr = attr->index; | |
236 | long temp; | |
237 | int ret; | |
238 | ||
239 | ret = kstrtol(buf, 10, &temp); | |
240 | if (ret) | |
241 | return ret; | |
242 | ||
243 | mutex_lock(&data->update_lock); | |
244 | data->temp[nr] = ADT7410_TEMP_TO_REG(temp); | |
245 | ret = i2c_smbus_write_word_swapped(client, ADT7410_REG_TEMP[nr], | |
246 | data->temp[nr]); | |
247 | if (ret) | |
248 | count = ret; | |
249 | mutex_unlock(&data->update_lock); | |
250 | return count; | |
251 | } | |
252 | ||
253 | static ssize_t adt7410_show_t_hyst(struct device *dev, | |
254 | struct device_attribute *da, | |
255 | char *buf) | |
256 | { | |
257 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
c55dc91e LPC |
258 | struct i2c_client *client = to_i2c_client(dev); |
259 | struct adt7410_data *data = i2c_get_clientdata(client); | |
983b97be | 260 | int nr = attr->index; |
37f9648b DC |
261 | int hyst; |
262 | ||
37f9648b | 263 | hyst = (data->hyst & ADT7410_T_HYST_MASK) * 1000; |
983b97be HK |
264 | |
265 | /* | |
266 | * hysteresis is stored as a 4 bit offset in the device, convert it | |
267 | * to an absolute value | |
268 | */ | |
269 | if (nr == 2) /* min has positive offset, others have negative */ | |
270 | hyst = -hyst; | |
271 | return sprintf(buf, "%d\n", | |
272 | ADT7410_REG_TO_TEMP(data, data->temp[nr]) - hyst); | |
273 | } | |
274 | ||
275 | static ssize_t adt7410_set_t_hyst(struct device *dev, | |
276 | struct device_attribute *da, | |
277 | const char *buf, size_t count) | |
278 | { | |
279 | struct i2c_client *client = to_i2c_client(dev); | |
280 | struct adt7410_data *data = i2c_get_clientdata(client); | |
281 | int limit, ret; | |
282 | long hyst; | |
283 | ||
284 | ret = kstrtol(buf, 10, &hyst); | |
285 | if (ret) | |
286 | return ret; | |
287 | /* convert absolute hysteresis value to a 4 bit delta value */ | |
288 | limit = ADT7410_REG_TO_TEMP(data, data->temp[1]); | |
2a844c14 GR |
289 | hyst = clamp_val(hyst, ADT7410_TEMP_MIN, ADT7410_TEMP_MAX); |
290 | data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000), 0, | |
291 | ADT7410_T_HYST_MASK); | |
983b97be HK |
292 | ret = i2c_smbus_write_byte_data(client, ADT7410_T_HYST, data->hyst); |
293 | if (ret) | |
294 | return ret; | |
295 | ||
296 | return count; | |
297 | } | |
298 | ||
299 | static ssize_t adt7410_show_alarm(struct device *dev, | |
300 | struct device_attribute *da, | |
301 | char *buf) | |
302 | { | |
303 | struct i2c_client *client = to_i2c_client(dev); | |
304 | struct sensor_device_attribute *attr = to_sensor_dev_attr(da); | |
305 | int ret; | |
306 | ||
307 | ret = i2c_smbus_read_byte_data(client, ADT7410_STATUS); | |
308 | if (ret < 0) | |
309 | return ret; | |
310 | ||
311 | return sprintf(buf, "%d\n", !!(ret & attr->index)); | |
312 | } | |
313 | ||
314 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, adt7410_show_temp, NULL, 0); | |
315 | static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, | |
316 | adt7410_show_temp, adt7410_set_temp, 1); | |
317 | static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, | |
318 | adt7410_show_temp, adt7410_set_temp, 2); | |
319 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, | |
320 | adt7410_show_temp, adt7410_set_temp, 3); | |
321 | static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, | |
322 | adt7410_show_t_hyst, adt7410_set_t_hyst, 1); | |
323 | static SENSOR_DEVICE_ATTR(temp1_min_hyst, S_IRUGO, | |
324 | adt7410_show_t_hyst, NULL, 2); | |
325 | static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, | |
326 | adt7410_show_t_hyst, NULL, 3); | |
327 | static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, adt7410_show_alarm, | |
328 | NULL, ADT7410_STAT_T_LOW); | |
329 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, adt7410_show_alarm, | |
330 | NULL, ADT7410_STAT_T_HIGH); | |
331 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, adt7410_show_alarm, | |
332 | NULL, ADT7410_STAT_T_CRIT); | |
333 | ||
334 | static struct attribute *adt7410_attributes[] = { | |
335 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
336 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
337 | &sensor_dev_attr_temp1_min.dev_attr.attr, | |
338 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
339 | &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, | |
340 | &sensor_dev_attr_temp1_min_hyst.dev_attr.attr, | |
341 | &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr, | |
342 | &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, | |
343 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
344 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
345 | NULL | |
346 | }; | |
347 | ||
348 | static const struct attribute_group adt7410_group = { | |
349 | .attrs = adt7410_attributes, | |
350 | }; | |
351 | ||
352 | /*-----------------------------------------------------------------------*/ | |
353 | ||
354 | /* device probe and removal */ | |
355 | ||
356 | static int adt7410_probe(struct i2c_client *client, | |
357 | const struct i2c_device_id *id) | |
358 | { | |
359 | struct adt7410_data *data; | |
360 | int ret; | |
361 | ||
362 | if (!i2c_check_functionality(client->adapter, | |
363 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA)) | |
364 | return -ENODEV; | |
365 | ||
366 | data = devm_kzalloc(&client->dev, sizeof(struct adt7410_data), | |
367 | GFP_KERNEL); | |
368 | if (!data) | |
369 | return -ENOMEM; | |
370 | ||
371 | i2c_set_clientdata(client, data); | |
372 | mutex_init(&data->update_lock); | |
373 | ||
374 | /* configure as specified */ | |
375 | ret = i2c_smbus_read_byte_data(client, ADT7410_CONFIG); | |
376 | if (ret < 0) { | |
377 | dev_dbg(&client->dev, "Can't read config? %d\n", ret); | |
378 | return ret; | |
379 | } | |
380 | data->oldconfig = ret; | |
381 | /* | |
382 | * Set to 16 bit resolution, continous conversion and comparator mode. | |
383 | */ | |
6e7d3b6b | 384 | ret &= ~ADT7410_MODE_MASK; |
983b97be HK |
385 | data->config = ret | ADT7410_FULL | ADT7410_RESOLUTION | |
386 | ADT7410_EVENT_MODE; | |
387 | if (data->config != data->oldconfig) { | |
388 | ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, | |
389 | data->config); | |
390 | if (ret) | |
391 | return ret; | |
392 | } | |
393 | dev_dbg(&client->dev, "Config %02x\n", data->config); | |
394 | ||
c55dc91e LPC |
395 | ret = adt7410_fill_cache(client); |
396 | if (ret) | |
397 | goto exit_restore; | |
398 | ||
983b97be HK |
399 | /* Register sysfs hooks */ |
400 | ret = sysfs_create_group(&client->dev.kobj, &adt7410_group); | |
401 | if (ret) | |
402 | goto exit_restore; | |
403 | ||
404 | data->hwmon_dev = hwmon_device_register(&client->dev); | |
405 | if (IS_ERR(data->hwmon_dev)) { | |
406 | ret = PTR_ERR(data->hwmon_dev); | |
407 | goto exit_remove; | |
408 | } | |
409 | ||
410 | dev_info(&client->dev, "sensor '%s'\n", client->name); | |
411 | ||
412 | return 0; | |
413 | ||
414 | exit_remove: | |
415 | sysfs_remove_group(&client->dev.kobj, &adt7410_group); | |
416 | exit_restore: | |
417 | i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->oldconfig); | |
418 | return ret; | |
419 | } | |
420 | ||
421 | static int adt7410_remove(struct i2c_client *client) | |
422 | { | |
423 | struct adt7410_data *data = i2c_get_clientdata(client); | |
424 | ||
425 | hwmon_device_unregister(data->hwmon_dev); | |
426 | sysfs_remove_group(&client->dev.kobj, &adt7410_group); | |
427 | if (data->oldconfig != data->config) | |
428 | i2c_smbus_write_byte_data(client, ADT7410_CONFIG, | |
429 | data->oldconfig); | |
430 | return 0; | |
431 | } | |
432 | ||
433 | static const struct i2c_device_id adt7410_ids[] = { | |
434 | { "adt7410", adt7410, }, | |
e46e5dc2 | 435 | { "adt7420", adt7410, }, |
983b97be HK |
436 | { /* LIST END */ } |
437 | }; | |
438 | MODULE_DEVICE_TABLE(i2c, adt7410_ids); | |
439 | ||
e0db9c4b | 440 | #ifdef CONFIG_PM_SLEEP |
983b97be HK |
441 | static int adt7410_suspend(struct device *dev) |
442 | { | |
443 | int ret; | |
444 | struct i2c_client *client = to_i2c_client(dev); | |
445 | struct adt7410_data *data = i2c_get_clientdata(client); | |
446 | ||
447 | ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, | |
448 | data->config | ADT7410_PD); | |
449 | return ret; | |
450 | } | |
451 | ||
452 | static int adt7410_resume(struct device *dev) | |
453 | { | |
454 | int ret; | |
455 | struct i2c_client *client = to_i2c_client(dev); | |
456 | struct adt7410_data *data = i2c_get_clientdata(client); | |
457 | ||
458 | ret = i2c_smbus_write_byte_data(client, ADT7410_CONFIG, data->config); | |
459 | return ret; | |
460 | } | |
461 | ||
436440fc LPC |
462 | static SIMPLE_DEV_PM_OPS(adt7410_dev_pm_ops, adt7410_suspend, adt7410_resume); |
463 | ||
983b97be HK |
464 | #define ADT7410_DEV_PM_OPS (&adt7410_dev_pm_ops) |
465 | #else | |
466 | #define ADT7410_DEV_PM_OPS NULL | |
467 | #endif /* CONFIG_PM */ | |
468 | ||
469 | static struct i2c_driver adt7410_driver = { | |
470 | .class = I2C_CLASS_HWMON, | |
471 | .driver = { | |
472 | .name = "adt7410", | |
473 | .pm = ADT7410_DEV_PM_OPS, | |
474 | }, | |
475 | .probe = adt7410_probe, | |
476 | .remove = adt7410_remove, | |
477 | .id_table = adt7410_ids, | |
54be068d | 478 | .address_list = I2C_ADDRS(0x48, 0x49, 0x4a, 0x4b), |
983b97be HK |
479 | }; |
480 | ||
481 | module_i2c_driver(adt7410_driver); | |
482 | ||
483 | MODULE_AUTHOR("Hartmut Knaack"); | |
e46e5dc2 | 484 | MODULE_DESCRIPTION("ADT7410/ADT7420 driver"); |
983b97be | 485 | MODULE_LICENSE("GPL"); |