1 /* tmp401.c
2 *
3 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
4 * Preliminary tmp411 support by:
5 * Gabriel Konat, Sander Leget, Wouter Willems
6 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
7 *
8 * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
9 * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26 /*
27 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
28 *
29 * Note this IC is in some aspect similar to the LM90, but it has quite a
30 * few differences too, for example the local temp has a higher resolution
31 * and thus has 16 bits registers for its value and limit instead of 8 bits.
32 */
33
34 #include <linux/module.h>
35 #include <linux/init.h>
36 #include <linux/bitops.h>
37 #include <linux/slab.h>
38 #include <linux/jiffies.h>
39 #include <linux/i2c.h>
40 #include <linux/hwmon.h>
41 #include <linux/hwmon-sysfs.h>
42 #include <linux/err.h>
43 #include <linux/mutex.h>
44 #include <linux/sysfs.h>
45
46 /* Addresses to scan */
47 static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
48 0x4e, 0x4f, I2C_CLIENT_END };
49
50 enum chips { tmp401, tmp411, tmp431, tmp432, tmp435, tmp461 };
51
52 /*
53 * The TMP401 registers, note some registers have different addresses for
54 * reading and writing
55 */
56 #define TMP401_STATUS 0x02
57 #define TMP401_CONFIG_READ 0x03
58 #define TMP401_CONFIG_WRITE 0x09
59 #define TMP401_CONVERSION_RATE_READ 0x04
60 #define TMP401_CONVERSION_RATE_WRITE 0x0A
61 #define TMP401_TEMP_CRIT_HYST 0x21
62 #define TMP401_MANUFACTURER_ID_REG 0xFE
63 #define TMP401_DEVICE_ID_REG 0xFF
64
65 static const u8 TMP401_TEMP_MSB_READ[7][2] = {
66 { 0x00, 0x01 }, /* temp */
67 { 0x06, 0x08 }, /* low limit */
68 { 0x05, 0x07 }, /* high limit */
69 { 0x20, 0x19 }, /* therm (crit) limit */
70 { 0x30, 0x34 }, /* lowest */
71 { 0x32, 0x36 }, /* highest */
72 { 0, 0x11 }, /* offset */
73 };
74
75 static const u8 TMP401_TEMP_MSB_WRITE[7][2] = {
76 { 0, 0 }, /* temp (unused) */
77 { 0x0C, 0x0E }, /* low limit */
78 { 0x0B, 0x0D }, /* high limit */
79 { 0x20, 0x19 }, /* therm (crit) limit */
80 { 0x30, 0x34 }, /* lowest */
81 { 0x32, 0x36 }, /* highest */
82 { 0, 0x11 }, /* offset */
83 };
84
85 static const u8 TMP432_TEMP_MSB_READ[4][3] = {
86 { 0x00, 0x01, 0x23 }, /* temp */
87 { 0x06, 0x08, 0x16 }, /* low limit */
88 { 0x05, 0x07, 0x15 }, /* high limit */
89 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
90 };
91
92 static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
93 { 0, 0, 0 }, /* temp - unused */
94 { 0x0C, 0x0E, 0x16 }, /* low limit */
95 { 0x0B, 0x0D, 0x15 }, /* high limit */
96 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
97 };
98
99 /* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
100 static const u8 TMP432_STATUS_REG[] = {
101 0x1b, 0x36, 0x35, 0x37 };
102
103 /* Flags */
104 #define TMP401_CONFIG_RANGE BIT(2)
105 #define TMP401_CONFIG_SHUTDOWN BIT(6)
106 #define TMP401_STATUS_LOCAL_CRIT BIT(0)
107 #define TMP401_STATUS_REMOTE_CRIT BIT(1)
108 #define TMP401_STATUS_REMOTE_OPEN BIT(2)
109 #define TMP401_STATUS_REMOTE_LOW BIT(3)
110 #define TMP401_STATUS_REMOTE_HIGH BIT(4)
111 #define TMP401_STATUS_LOCAL_LOW BIT(5)
112 #define TMP401_STATUS_LOCAL_HIGH BIT(6)
113
114 /* On TMP432, each status has its own register */
115 #define TMP432_STATUS_LOCAL BIT(0)
116 #define TMP432_STATUS_REMOTE1 BIT(1)
117 #define TMP432_STATUS_REMOTE2 BIT(2)
118
119 /* Manufacturer / Device ID's */
120 #define TMP401_MANUFACTURER_ID 0x55
121 #define TMP401_DEVICE_ID 0x11
122 #define TMP411A_DEVICE_ID 0x12
123 #define TMP411B_DEVICE_ID 0x13
124 #define TMP411C_DEVICE_ID 0x10
125 #define TMP431_DEVICE_ID 0x31
126 #define TMP432_DEVICE_ID 0x32
127 #define TMP435_DEVICE_ID 0x35
128
129 /*
130 * Driver data (common to all clients)
131 */
132
133 static const struct i2c_device_id tmp401_id[] = {
134 { "tmp401", tmp401 },
135 { "tmp411", tmp411 },
136 { "tmp431", tmp431 },
137 { "tmp432", tmp432 },
138 { "tmp435", tmp435 },
139 { "tmp461", tmp461 },
140 { }
141 };
142 MODULE_DEVICE_TABLE(i2c, tmp401_id);
143
144 /*
145 * Client data (each client gets its own)
146 */
147
148 struct tmp401_data {
149 struct i2c_client *client;
150 const struct attribute_group *groups[3];
151 struct mutex update_lock;
152 char valid; /* zero until following fields are valid */
153 unsigned long last_updated; /* in jiffies */
154 enum chips kind;
155
156 unsigned int update_interval; /* in milliseconds */
157
158 /* register values */
159 u8 status[4];
160 u8 config;
161 u16 temp[7][3];
162 u8 temp_crit_hyst;
163 };
164
165 /*
166 * Sysfs attr show / store functions
167 */
168
tmp401_register_to_temp(u16 reg,u8 config)169 static int tmp401_register_to_temp(u16 reg, u8 config)
170 {
171 int temp = reg;
172
173 if (config & TMP401_CONFIG_RANGE)
174 temp -= 64 * 256;
175
176 return DIV_ROUND_CLOSEST(temp * 125, 32);
177 }
178
tmp401_temp_to_register(long temp,u8 config,int zbits)179 static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
180 {
181 if (config & TMP401_CONFIG_RANGE) {
182 temp = clamp_val(temp, -64000, 191000);
183 temp += 64000;
184 } else
185 temp = clamp_val(temp, 0, 127000);
186
187 return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
188 }
189
tmp401_update_device_reg16(struct i2c_client * client,struct tmp401_data * data)190 static int tmp401_update_device_reg16(struct i2c_client *client,
191 struct tmp401_data *data)
192 {
193 int i, j, val;
194 int num_regs = data->kind == tmp411 ? 6 : 4;
195 int num_sensors = data->kind == tmp432 ? 3 : 2;
196
197 for (i = 0; i < num_sensors; i++) { /* local / r1 / r2 */
198 for (j = 0; j < num_regs; j++) { /* temp / low / ... */
199 u8 regaddr;
200
201 regaddr = data->kind == tmp432 ?
202 TMP432_TEMP_MSB_READ[j][i] :
203 TMP401_TEMP_MSB_READ[j][i];
204 if (j == 3) { /* crit is msb only */
205 val = i2c_smbus_read_byte_data(client, regaddr);
206 } else {
207 val = i2c_smbus_read_word_swapped(client,
208 regaddr);
209 }
210 if (val < 0)
211 return val;
212
213 data->temp[j][i] = j == 3 ? val << 8 : val;
214 }
215 }
216 return 0;
217 }
218
tmp401_update_device(struct device * dev)219 static struct tmp401_data *tmp401_update_device(struct device *dev)
220 {
221 struct tmp401_data *data = dev_get_drvdata(dev);
222 struct i2c_client *client = data->client;
223 struct tmp401_data *ret = data;
224 int i, val;
225 unsigned long next_update;
226
227 mutex_lock(&data->update_lock);
228
229 next_update = data->last_updated +
230 msecs_to_jiffies(data->update_interval);
231 if (time_after(jiffies, next_update) || !data->valid) {
232 if (data->kind != tmp432) {
233 /*
234 * The driver uses the TMP432 status format internally.
235 * Convert status to TMP432 format for other chips.
236 */
237 val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
238 if (val < 0) {
239 ret = ERR_PTR(val);
240 goto abort;
241 }
242 data->status[0] =
243 (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
244 data->status[1] =
245 ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
246 ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
247 data->status[2] =
248 ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
249 ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
250 data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
251 | TMP401_STATUS_REMOTE_CRIT);
252 } else {
253 for (i = 0; i < ARRAY_SIZE(data->status); i++) {
254 val = i2c_smbus_read_byte_data(client,
255 TMP432_STATUS_REG[i]);
256 if (val < 0) {
257 ret = ERR_PTR(val);
258 goto abort;
259 }
260 data->status[i] = val;
261 }
262 }
263
264 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
265 if (val < 0) {
266 ret = ERR_PTR(val);
267 goto abort;
268 }
269 data->config = val;
270 val = tmp401_update_device_reg16(client, data);
271 if (val < 0) {
272 ret = ERR_PTR(val);
273 goto abort;
274 }
275 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
276 if (val < 0) {
277 ret = ERR_PTR(val);
278 goto abort;
279 }
280 data->temp_crit_hyst = val;
281
282 data->last_updated = jiffies;
283 data->valid = 1;
284 }
285
286 abort:
287 mutex_unlock(&data->update_lock);
288 return ret;
289 }
290
show_temp(struct device * dev,struct device_attribute * devattr,char * buf)291 static ssize_t show_temp(struct device *dev,
292 struct device_attribute *devattr, char *buf)
293 {
294 int nr = to_sensor_dev_attr_2(devattr)->nr;
295 int index = to_sensor_dev_attr_2(devattr)->index;
296 struct tmp401_data *data = tmp401_update_device(dev);
297
298 if (IS_ERR(data))
299 return PTR_ERR(data);
300
301 return sprintf(buf, "%d\n",
302 tmp401_register_to_temp(data->temp[nr][index], data->config));
303 }
304
show_temp_crit_hyst(struct device * dev,struct device_attribute * devattr,char * buf)305 static ssize_t show_temp_crit_hyst(struct device *dev,
306 struct device_attribute *devattr, char *buf)
307 {
308 int temp, index = to_sensor_dev_attr(devattr)->index;
309 struct tmp401_data *data = tmp401_update_device(dev);
310
311 if (IS_ERR(data))
312 return PTR_ERR(data);
313
314 mutex_lock(&data->update_lock);
315 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
316 temp -= data->temp_crit_hyst * 1000;
317 mutex_unlock(&data->update_lock);
318
319 return sprintf(buf, "%d\n", temp);
320 }
321
show_status(struct device * dev,struct device_attribute * devattr,char * buf)322 static ssize_t show_status(struct device *dev,
323 struct device_attribute *devattr, char *buf)
324 {
325 int nr = to_sensor_dev_attr_2(devattr)->nr;
326 int mask = to_sensor_dev_attr_2(devattr)->index;
327 struct tmp401_data *data = tmp401_update_device(dev);
328
329 if (IS_ERR(data))
330 return PTR_ERR(data);
331
332 return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
333 }
334
store_temp(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)335 static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
336 const char *buf, size_t count)
337 {
338 int nr = to_sensor_dev_attr_2(devattr)->nr;
339 int index = to_sensor_dev_attr_2(devattr)->index;
340 struct tmp401_data *data = dev_get_drvdata(dev);
341 struct i2c_client *client = data->client;
342 long val;
343 u16 reg;
344 u8 regaddr;
345
346 if (kstrtol(buf, 10, &val))
347 return -EINVAL;
348
349 reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
350
351 mutex_lock(&data->update_lock);
352
353 regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
354 : TMP401_TEMP_MSB_WRITE[nr][index];
355 if (nr == 3) { /* crit is msb only */
356 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
357 } else {
358 /* Hardware expects big endian data --> use _swapped */
359 i2c_smbus_write_word_swapped(client, regaddr, reg);
360 }
361 data->temp[nr][index] = reg;
362
363 mutex_unlock(&data->update_lock);
364
365 return count;
366 }
367
store_temp_crit_hyst(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)368 static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
369 *devattr, const char *buf, size_t count)
370 {
371 int temp, index = to_sensor_dev_attr(devattr)->index;
372 struct tmp401_data *data = tmp401_update_device(dev);
373 long val;
374 u8 reg;
375
376 if (IS_ERR(data))
377 return PTR_ERR(data);
378
379 if (kstrtol(buf, 10, &val))
380 return -EINVAL;
381
382 if (data->config & TMP401_CONFIG_RANGE)
383 val = clamp_val(val, -64000, 191000);
384 else
385 val = clamp_val(val, 0, 127000);
386
387 mutex_lock(&data->update_lock);
388 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
389 val = clamp_val(val, temp - 255000, temp);
390 reg = ((temp - val) + 500) / 1000;
391
392 i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
393 reg);
394
395 data->temp_crit_hyst = reg;
396
397 mutex_unlock(&data->update_lock);
398
399 return count;
400 }
401
402 /*
403 * Resets the historical measurements of minimum and maximum temperatures.
404 * This is done by writing any value to any of the minimum/maximum registers
405 * (0x30-0x37).
406 */
reset_temp_history(struct device * dev,struct device_attribute * devattr,const char * buf,size_t count)407 static ssize_t reset_temp_history(struct device *dev,
408 struct device_attribute *devattr, const char *buf, size_t count)
409 {
410 struct tmp401_data *data = dev_get_drvdata(dev);
411 struct i2c_client *client = data->client;
412 long val;
413
414 if (kstrtol(buf, 10, &val))
415 return -EINVAL;
416
417 if (val != 1) {
418 dev_err(dev,
419 "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
420 val);
421 return -EINVAL;
422 }
423 mutex_lock(&data->update_lock);
424 i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
425 data->valid = 0;
426 mutex_unlock(&data->update_lock);
427
428 return count;
429 }
430
update_interval_show(struct device * dev,struct device_attribute * attr,char * buf)431 static ssize_t update_interval_show(struct device *dev,
432 struct device_attribute *attr, char *buf)
433 {
434 struct tmp401_data *data = dev_get_drvdata(dev);
435
436 return sprintf(buf, "%u\n", data->update_interval);
437 }
438
update_interval_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)439 static ssize_t update_interval_store(struct device *dev,
440 struct device_attribute *attr,
441 const char *buf, size_t count)
442 {
443 struct tmp401_data *data = dev_get_drvdata(dev);
444 struct i2c_client *client = data->client;
445 unsigned long val;
446 int err, rate;
447
448 err = kstrtoul(buf, 10, &val);
449 if (err)
450 return err;
451
452 /*
453 * For valid rates, interval can be calculated as
454 * interval = (1 << (7 - rate)) * 125;
455 * Rounded rate is therefore
456 * rate = 7 - __fls(interval * 4 / (125 * 3));
457 * Use clamp_val() to avoid overflows, and to ensure valid input
458 * for __fls.
459 */
460 val = clamp_val(val, 125, 16000);
461 rate = 7 - __fls(val * 4 / (125 * 3));
462 mutex_lock(&data->update_lock);
463 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
464 data->update_interval = (1 << (7 - rate)) * 125;
465 mutex_unlock(&data->update_lock);
466
467 return count;
468 }
469
470 static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
471 static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
472 store_temp, 1, 0);
473 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
474 store_temp, 2, 0);
475 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
476 store_temp, 3, 0);
477 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
478 show_temp_crit_hyst, store_temp_crit_hyst, 0);
479 static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
480 1, TMP432_STATUS_LOCAL);
481 static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
482 2, TMP432_STATUS_LOCAL);
483 static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
484 3, TMP432_STATUS_LOCAL);
485 static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
486 static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
487 store_temp, 1, 1);
488 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
489 store_temp, 2, 1);
490 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
491 store_temp, 3, 1);
492 static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
493 NULL, 1);
494 static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
495 0, TMP432_STATUS_REMOTE1);
496 static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
497 1, TMP432_STATUS_REMOTE1);
498 static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
499 2, TMP432_STATUS_REMOTE1);
500 static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
501 3, TMP432_STATUS_REMOTE1);
502
503 static DEVICE_ATTR_RW(update_interval);
504
505 static struct attribute *tmp401_attributes[] = {
506 &sensor_dev_attr_temp1_input.dev_attr.attr,
507 &sensor_dev_attr_temp1_min.dev_attr.attr,
508 &sensor_dev_attr_temp1_max.dev_attr.attr,
509 &sensor_dev_attr_temp1_crit.dev_attr.attr,
510 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
511 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
512 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
513 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
514
515 &sensor_dev_attr_temp2_input.dev_attr.attr,
516 &sensor_dev_attr_temp2_min.dev_attr.attr,
517 &sensor_dev_attr_temp2_max.dev_attr.attr,
518 &sensor_dev_attr_temp2_crit.dev_attr.attr,
519 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
520 &sensor_dev_attr_temp2_fault.dev_attr.attr,
521 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
522 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
523 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
524
525 &dev_attr_update_interval.attr,
526
527 NULL
528 };
529
530 static const struct attribute_group tmp401_group = {
531 .attrs = tmp401_attributes,
532 };
533
534 /*
535 * Additional features of the TMP411 chip.
536 * The TMP411 stores the minimum and maximum
537 * temperature measured since power-on, chip-reset, or
538 * minimum and maximum register reset for both the local
539 * and remote channels.
540 */
541 static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
542 static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
543 static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
544 static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
545 static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
546 0);
547
548 static struct attribute *tmp411_attributes[] = {
549 &sensor_dev_attr_temp1_highest.dev_attr.attr,
550 &sensor_dev_attr_temp1_lowest.dev_attr.attr,
551 &sensor_dev_attr_temp2_highest.dev_attr.attr,
552 &sensor_dev_attr_temp2_lowest.dev_attr.attr,
553 &sensor_dev_attr_temp_reset_history.dev_attr.attr,
554 NULL
555 };
556
557 static const struct attribute_group tmp411_group = {
558 .attrs = tmp411_attributes,
559 };
560
561 static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
562 static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
563 store_temp, 1, 2);
564 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
565 store_temp, 2, 2);
566 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
567 store_temp, 3, 2);
568 static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
569 NULL, 2);
570 static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
571 0, TMP432_STATUS_REMOTE2);
572 static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
573 1, TMP432_STATUS_REMOTE2);
574 static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
575 2, TMP432_STATUS_REMOTE2);
576 static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
577 3, TMP432_STATUS_REMOTE2);
578
579 static struct attribute *tmp432_attributes[] = {
580 &sensor_dev_attr_temp3_input.dev_attr.attr,
581 &sensor_dev_attr_temp3_min.dev_attr.attr,
582 &sensor_dev_attr_temp3_max.dev_attr.attr,
583 &sensor_dev_attr_temp3_crit.dev_attr.attr,
584 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
585 &sensor_dev_attr_temp3_fault.dev_attr.attr,
586 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
587 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
588 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
589
590 NULL
591 };
592
593 static const struct attribute_group tmp432_group = {
594 .attrs = tmp432_attributes,
595 };
596
597 /*
598 * Additional features of the TMP461 chip.
599 * The TMP461 temperature offset for the remote channel.
600 */
601 static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp,
602 store_temp, 6, 1);
603
604 static struct attribute *tmp461_attributes[] = {
605 &sensor_dev_attr_temp2_offset.dev_attr.attr,
606 NULL
607 };
608
609 static const struct attribute_group tmp461_group = {
610 .attrs = tmp461_attributes,
611 };
612
613 /*
614 * Begin non sysfs callback code (aka Real code)
615 */
616
tmp401_init_client(struct tmp401_data * data,struct i2c_client * client)617 static int tmp401_init_client(struct tmp401_data *data,
618 struct i2c_client *client)
619 {
620 int config, config_orig, status = 0;
621
622 /* Set the conversion rate to 2 Hz */
623 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
624 data->update_interval = 500;
625
626 /* Start conversions (disable shutdown if necessary) */
627 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
628 if (config < 0)
629 return config;
630
631 config_orig = config;
632 config &= ~TMP401_CONFIG_SHUTDOWN;
633
634 if (config != config_orig)
635 status = i2c_smbus_write_byte_data(client,
636 TMP401_CONFIG_WRITE,
637 config);
638
639 return status;
640 }
641
tmp401_detect(struct i2c_client * client,struct i2c_board_info * info)642 static int tmp401_detect(struct i2c_client *client,
643 struct i2c_board_info *info)
644 {
645 enum chips kind;
646 struct i2c_adapter *adapter = client->adapter;
647 u8 reg;
648
649 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
650 return -ENODEV;
651
652 /* Detect and identify the chip */
653 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
654 if (reg != TMP401_MANUFACTURER_ID)
655 return -ENODEV;
656
657 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
658
659 switch (reg) {
660 case TMP401_DEVICE_ID:
661 if (client->addr != 0x4c)
662 return -ENODEV;
663 kind = tmp401;
664 break;
665 case TMP411A_DEVICE_ID:
666 if (client->addr != 0x4c)
667 return -ENODEV;
668 kind = tmp411;
669 break;
670 case TMP411B_DEVICE_ID:
671 if (client->addr != 0x4d)
672 return -ENODEV;
673 kind = tmp411;
674 break;
675 case TMP411C_DEVICE_ID:
676 if (client->addr != 0x4e)
677 return -ENODEV;
678 kind = tmp411;
679 break;
680 case TMP431_DEVICE_ID:
681 if (client->addr != 0x4c && client->addr != 0x4d)
682 return -ENODEV;
683 kind = tmp431;
684 break;
685 case TMP432_DEVICE_ID:
686 if (client->addr != 0x4c && client->addr != 0x4d)
687 return -ENODEV;
688 kind = tmp432;
689 break;
690 case TMP435_DEVICE_ID:
691 kind = tmp435;
692 break;
693 default:
694 return -ENODEV;
695 }
696
697 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
698 if (reg & 0x1b)
699 return -ENODEV;
700
701 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
702 /* Datasheet says: 0x1-0x6 */
703 if (reg > 15)
704 return -ENODEV;
705
706 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
707
708 return 0;
709 }
710
tmp401_probe(struct i2c_client * client,const struct i2c_device_id * id)711 static int tmp401_probe(struct i2c_client *client,
712 const struct i2c_device_id *id)
713 {
714 static const char * const names[] = {
715 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
716 };
717 struct device *dev = &client->dev;
718 struct device *hwmon_dev;
719 struct tmp401_data *data;
720 int groups = 0, status;
721
722 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
723 if (!data)
724 return -ENOMEM;
725
726 data->client = client;
727 mutex_init(&data->update_lock);
728 data->kind = id->driver_data;
729
730 /* Initialize the TMP401 chip */
731 status = tmp401_init_client(data, client);
732 if (status < 0)
733 return status;
734
735 /* Register sysfs hooks */
736 data->groups[groups++] = &tmp401_group;
737
738 /* Register additional tmp411 sysfs hooks */
739 if (data->kind == tmp411)
740 data->groups[groups++] = &tmp411_group;
741
742 /* Register additional tmp432 sysfs hooks */
743 if (data->kind == tmp432)
744 data->groups[groups++] = &tmp432_group;
745
746 if (data->kind == tmp461)
747 data->groups[groups++] = &tmp461_group;
748
749 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
750 data, data->groups);
751 if (IS_ERR(hwmon_dev))
752 return PTR_ERR(hwmon_dev);
753
754 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
755
756 return 0;
757 }
758
759 static struct i2c_driver tmp401_driver = {
760 .class = I2C_CLASS_HWMON,
761 .driver = {
762 .name = "tmp401",
763 },
764 .probe = tmp401_probe,
765 .id_table = tmp401_id,
766 .detect = tmp401_detect,
767 .address_list = normal_i2c,
768 };
769
770 module_i2c_driver(tmp401_driver);
771
772 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
773 MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
774 MODULE_LICENSE("GPL");
775
