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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 */
47static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
48 0x4e, 0x4f, I2C_CLIENT_END };
49
50enum 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
65static 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
75static 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
85static const u8 TMP401_TEMP_LSB[7][2] = {
86 { 0x15, 0x10 }, /* temp */
87 { 0x17, 0x14 }, /* low limit */
88 { 0x16, 0x13 }, /* high limit */
89 { 0, 0 }, /* therm (crit) limit (unused) */
90 { 0x31, 0x35 }, /* lowest */
91 { 0x33, 0x37 }, /* highest */
92 { 0, 0x12 }, /* offset */
93};
94
95static const u8 TMP432_TEMP_MSB_READ[4][3] = {
96 { 0x00, 0x01, 0x23 }, /* temp */
97 { 0x06, 0x08, 0x16 }, /* low limit */
98 { 0x05, 0x07, 0x15 }, /* high limit */
99 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
100};
101
102static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
103 { 0, 0, 0 }, /* temp - unused */
104 { 0x0C, 0x0E, 0x16 }, /* low limit */
105 { 0x0B, 0x0D, 0x15 }, /* high limit */
106 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
107};
108
109static const u8 TMP432_TEMP_LSB[3][3] = {
110 { 0x29, 0x10, 0x24 }, /* temp */
111 { 0x3E, 0x14, 0x18 }, /* low limit */
112 { 0x3D, 0x13, 0x17 }, /* high limit */
113};
114
115/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
116static const u8 TMP432_STATUS_REG[] = {
117 0x1b, 0x36, 0x35, 0x37 };
118
119/* Flags */
120#define TMP401_CONFIG_RANGE BIT(2)
121#define TMP401_CONFIG_SHUTDOWN BIT(6)
122#define TMP401_STATUS_LOCAL_CRIT BIT(0)
123#define TMP401_STATUS_REMOTE_CRIT BIT(1)
124#define TMP401_STATUS_REMOTE_OPEN BIT(2)
125#define TMP401_STATUS_REMOTE_LOW BIT(3)
126#define TMP401_STATUS_REMOTE_HIGH BIT(4)
127#define TMP401_STATUS_LOCAL_LOW BIT(5)
128#define TMP401_STATUS_LOCAL_HIGH BIT(6)
129
130/* On TMP432, each status has its own register */
131#define TMP432_STATUS_LOCAL BIT(0)
132#define TMP432_STATUS_REMOTE1 BIT(1)
133#define TMP432_STATUS_REMOTE2 BIT(2)
134
135/* Manufacturer / Device ID's */
136#define TMP401_MANUFACTURER_ID 0x55
137#define TMP401_DEVICE_ID 0x11
138#define TMP411A_DEVICE_ID 0x12
139#define TMP411B_DEVICE_ID 0x13
140#define TMP411C_DEVICE_ID 0x10
141#define TMP431_DEVICE_ID 0x31
142#define TMP432_DEVICE_ID 0x32
143#define TMP435_DEVICE_ID 0x35
144
145/*
146 * Driver data (common to all clients)
147 */
148
149static const struct i2c_device_id tmp401_id[] = {
150 { "tmp401", tmp401 },
151 { "tmp411", tmp411 },
152 { "tmp431", tmp431 },
153 { "tmp432", tmp432 },
154 { "tmp435", tmp435 },
155 { "tmp461", tmp461 },
156 { }
157};
158MODULE_DEVICE_TABLE(i2c, tmp401_id);
159
160/*
161 * Client data (each client gets its own)
162 */
163
164struct tmp401_data {
165 struct i2c_client *client;
166 const struct attribute_group *groups[3];
167 struct mutex update_lock;
168 char valid; /* zero until following fields are valid */
169 unsigned long last_updated; /* in jiffies */
170 enum chips kind;
171
172 unsigned int update_interval; /* in milliseconds */
173
174 /* register values */
175 u8 status[4];
176 u8 config;
177 u16 temp[7][3];
178 u8 temp_crit_hyst;
179};
180
181/*
182 * Sysfs attr show / store functions
183 */
184
185static int tmp401_register_to_temp(u16 reg, u8 config)
186{
187 int temp = reg;
188
189 if (config & TMP401_CONFIG_RANGE)
190 temp -= 64 * 256;
191
192 return DIV_ROUND_CLOSEST(temp * 125, 32);
193}
194
195static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
196{
197 if (config & TMP401_CONFIG_RANGE) {
198 temp = clamp_val(temp, -64000, 191000);
199 temp += 64000;
200 } else
201 temp = clamp_val(temp, 0, 127000);
202
203 return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
204}
205
206static int tmp401_update_device_reg16(struct i2c_client *client,
207 struct tmp401_data *data)
208{
209 int i, j, val;
210 int num_regs = data->kind == tmp411 ? 6 : 4;
211 int num_sensors = data->kind == tmp432 ? 3 : 2;
212
213 for (i = 0; i < num_sensors; i++) { /* local / r1 / r2 */
214 for (j = 0; j < num_regs; j++) { /* temp / low / ... */
215 u8 regaddr;
216 /*
217 * High byte must be read first immediately followed
218 * by the low byte
219 */
220 regaddr = data->kind == tmp432 ?
221 TMP432_TEMP_MSB_READ[j][i] :
222 TMP401_TEMP_MSB_READ[j][i];
223 val = i2c_smbus_read_byte_data(client, regaddr);
224 if (val < 0)
225 return val;
226 data->temp[j][i] = val << 8;
227 if (j == 3) /* crit is msb only */
228 continue;
229 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
230 : TMP401_TEMP_LSB[j][i];
231 val = i2c_smbus_read_byte_data(client, regaddr);
232 if (val < 0)
233 return val;
234 data->temp[j][i] |= val;
235 }
236 }
237 return 0;
238}
239
240static struct tmp401_data *tmp401_update_device(struct device *dev)
241{
242 struct tmp401_data *data = dev_get_drvdata(dev);
243 struct i2c_client *client = data->client;
244 struct tmp401_data *ret = data;
245 int i, val;
246 unsigned long next_update;
247
248 mutex_lock(&data->update_lock);
249
250 next_update = data->last_updated +
251 msecs_to_jiffies(data->update_interval);
252 if (time_after(jiffies, next_update) || !data->valid) {
253 if (data->kind != tmp432) {
254 /*
255 * The driver uses the TMP432 status format internally.
256 * Convert status to TMP432 format for other chips.
257 */
258 val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
259 if (val < 0) {
260 ret = ERR_PTR(val);
261 goto abort;
262 }
263 data->status[0] =
264 (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
265 data->status[1] =
266 ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
267 ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
268 data->status[2] =
269 ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
270 ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
271 data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
272 | TMP401_STATUS_REMOTE_CRIT);
273 } else {
274 for (i = 0; i < ARRAY_SIZE(data->status); i++) {
275 val = i2c_smbus_read_byte_data(client,
276 TMP432_STATUS_REG[i]);
277 if (val < 0) {
278 ret = ERR_PTR(val);
279 goto abort;
280 }
281 data->status[i] = val;
282 }
283 }
284
285 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
286 if (val < 0) {
287 ret = ERR_PTR(val);
288 goto abort;
289 }
290 data->config = val;
291 val = tmp401_update_device_reg16(client, data);
292 if (val < 0) {
293 ret = ERR_PTR(val);
294 goto abort;
295 }
296 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
297 if (val < 0) {
298 ret = ERR_PTR(val);
299 goto abort;
300 }
301 data->temp_crit_hyst = val;
302
303 data->last_updated = jiffies;
304 data->valid = 1;
305 }
306
307abort:
308 mutex_unlock(&data->update_lock);
309 return ret;
310}
311
312static ssize_t show_temp(struct device *dev,
313 struct device_attribute *devattr, char *buf)
314{
315 int nr = to_sensor_dev_attr_2(devattr)->nr;
316 int index = to_sensor_dev_attr_2(devattr)->index;
317 struct tmp401_data *data = tmp401_update_device(dev);
318
319 if (IS_ERR(data))
320 return PTR_ERR(data);
321
322 return sprintf(buf, "%d\n",
323 tmp401_register_to_temp(data->temp[nr][index], data->config));
324}
325
326static ssize_t show_temp_crit_hyst(struct device *dev,
327 struct device_attribute *devattr, char *buf)
328{
329 int temp, index = to_sensor_dev_attr(devattr)->index;
330 struct tmp401_data *data = tmp401_update_device(dev);
331
332 if (IS_ERR(data))
333 return PTR_ERR(data);
334
335 mutex_lock(&data->update_lock);
336 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
337 temp -= data->temp_crit_hyst * 1000;
338 mutex_unlock(&data->update_lock);
339
340 return sprintf(buf, "%d\n", temp);
341}
342
343static ssize_t show_status(struct device *dev,
344 struct device_attribute *devattr, char *buf)
345{
346 int nr = to_sensor_dev_attr_2(devattr)->nr;
347 int mask = to_sensor_dev_attr_2(devattr)->index;
348 struct tmp401_data *data = tmp401_update_device(dev);
349
350 if (IS_ERR(data))
351 return PTR_ERR(data);
352
353 return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
354}
355
356static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
357 const char *buf, size_t count)
358{
359 int nr = to_sensor_dev_attr_2(devattr)->nr;
360 int index = to_sensor_dev_attr_2(devattr)->index;
361 struct tmp401_data *data = dev_get_drvdata(dev);
362 struct i2c_client *client = data->client;
363 long val;
364 u16 reg;
365 u8 regaddr;
366
367 if (kstrtol(buf, 10, &val))
368 return -EINVAL;
369
370 reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
371
372 mutex_lock(&data->update_lock);
373
374 regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
375 : TMP401_TEMP_MSB_WRITE[nr][index];
376 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
377 if (nr != 3) {
378 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
379 : TMP401_TEMP_LSB[nr][index];
380 i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
381 }
382 data->temp[nr][index] = reg;
383
384 mutex_unlock(&data->update_lock);
385
386 return count;
387}
388
389static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
390 *devattr, const char *buf, size_t count)
391{
392 int temp, index = to_sensor_dev_attr(devattr)->index;
393 struct tmp401_data *data = tmp401_update_device(dev);
394 long val;
395 u8 reg;
396
397 if (IS_ERR(data))
398 return PTR_ERR(data);
399
400 if (kstrtol(buf, 10, &val))
401 return -EINVAL;
402
403 if (data->config & TMP401_CONFIG_RANGE)
404 val = clamp_val(val, -64000, 191000);
405 else
406 val = clamp_val(val, 0, 127000);
407
408 mutex_lock(&data->update_lock);
409 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
410 val = clamp_val(val, temp - 255000, temp);
411 reg = ((temp - val) + 500) / 1000;
412
413 i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
414 reg);
415
416 data->temp_crit_hyst = reg;
417
418 mutex_unlock(&data->update_lock);
419
420 return count;
421}
422
423/*
424 * Resets the historical measurements of minimum and maximum temperatures.
425 * This is done by writing any value to any of the minimum/maximum registers
426 * (0x30-0x37).
427 */
428static ssize_t reset_temp_history(struct device *dev,
429 struct device_attribute *devattr, const char *buf, size_t count)
430{
431 struct tmp401_data *data = dev_get_drvdata(dev);
432 struct i2c_client *client = data->client;
433 long val;
434
435 if (kstrtol(buf, 10, &val))
436 return -EINVAL;
437
438 if (val != 1) {
439 dev_err(dev,
440 "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
441 val);
442 return -EINVAL;
443 }
444 mutex_lock(&data->update_lock);
445 i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
446 data->valid = 0;
447 mutex_unlock(&data->update_lock);
448
449 return count;
450}
451
452static ssize_t show_update_interval(struct device *dev,
453 struct device_attribute *attr, char *buf)
454{
455 struct tmp401_data *data = dev_get_drvdata(dev);
456
457 return sprintf(buf, "%u\n", data->update_interval);
458}
459
460static ssize_t set_update_interval(struct device *dev,
461 struct device_attribute *attr,
462 const char *buf, size_t count)
463{
464 struct tmp401_data *data = dev_get_drvdata(dev);
465 struct i2c_client *client = data->client;
466 unsigned long val;
467 int err, rate;
468
469 err = kstrtoul(buf, 10, &val);
470 if (err)
471 return err;
472
473 /*
474 * For valid rates, interval can be calculated as
475 * interval = (1 << (7 - rate)) * 125;
476 * Rounded rate is therefore
477 * rate = 7 - __fls(interval * 4 / (125 * 3));
478 * Use clamp_val() to avoid overflows, and to ensure valid input
479 * for __fls.
480 */
481 val = clamp_val(val, 125, 16000);
482 rate = 7 - __fls(val * 4 / (125 * 3));
483 mutex_lock(&data->update_lock);
484 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
485 data->update_interval = (1 << (7 - rate)) * 125;
486 mutex_unlock(&data->update_lock);
487
488 return count;
489}
490
491static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
492static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
493 store_temp, 1, 0);
494static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
495 store_temp, 2, 0);
496static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
497 store_temp, 3, 0);
498static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
499 show_temp_crit_hyst, store_temp_crit_hyst, 0);
500static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
501 1, TMP432_STATUS_LOCAL);
502static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
503 2, TMP432_STATUS_LOCAL);
504static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
505 3, TMP432_STATUS_LOCAL);
506static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
507static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
508 store_temp, 1, 1);
509static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
510 store_temp, 2, 1);
511static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
512 store_temp, 3, 1);
513static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
514 NULL, 1);
515static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
516 0, TMP432_STATUS_REMOTE1);
517static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
518 1, TMP432_STATUS_REMOTE1);
519static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
520 2, TMP432_STATUS_REMOTE1);
521static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
522 3, TMP432_STATUS_REMOTE1);
523
524static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
525 set_update_interval);
526
527static struct attribute *tmp401_attributes[] = {
528 &sensor_dev_attr_temp1_input.dev_attr.attr,
529 &sensor_dev_attr_temp1_min.dev_attr.attr,
530 &sensor_dev_attr_temp1_max.dev_attr.attr,
531 &sensor_dev_attr_temp1_crit.dev_attr.attr,
532 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
533 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
534 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
535 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
536
537 &sensor_dev_attr_temp2_input.dev_attr.attr,
538 &sensor_dev_attr_temp2_min.dev_attr.attr,
539 &sensor_dev_attr_temp2_max.dev_attr.attr,
540 &sensor_dev_attr_temp2_crit.dev_attr.attr,
541 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
542 &sensor_dev_attr_temp2_fault.dev_attr.attr,
543 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
544 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
545 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
546
547 &dev_attr_update_interval.attr,
548
549 NULL
550};
551
552static const struct attribute_group tmp401_group = {
553 .attrs = tmp401_attributes,
554};
555
556/*
557 * Additional features of the TMP411 chip.
558 * The TMP411 stores the minimum and maximum
559 * temperature measured since power-on, chip-reset, or
560 * minimum and maximum register reset for both the local
561 * and remote channels.
562 */
563static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
564static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
565static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
566static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
567static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
568 0);
569
570static struct attribute *tmp411_attributes[] = {
571 &sensor_dev_attr_temp1_highest.dev_attr.attr,
572 &sensor_dev_attr_temp1_lowest.dev_attr.attr,
573 &sensor_dev_attr_temp2_highest.dev_attr.attr,
574 &sensor_dev_attr_temp2_lowest.dev_attr.attr,
575 &sensor_dev_attr_temp_reset_history.dev_attr.attr,
576 NULL
577};
578
579static const struct attribute_group tmp411_group = {
580 .attrs = tmp411_attributes,
581};
582
583static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
584static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
585 store_temp, 1, 2);
586static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
587 store_temp, 2, 2);
588static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
589 store_temp, 3, 2);
590static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
591 NULL, 2);
592static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
593 0, TMP432_STATUS_REMOTE2);
594static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
595 1, TMP432_STATUS_REMOTE2);
596static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
597 2, TMP432_STATUS_REMOTE2);
598static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
599 3, TMP432_STATUS_REMOTE2);
600
601static struct attribute *tmp432_attributes[] = {
602 &sensor_dev_attr_temp3_input.dev_attr.attr,
603 &sensor_dev_attr_temp3_min.dev_attr.attr,
604 &sensor_dev_attr_temp3_max.dev_attr.attr,
605 &sensor_dev_attr_temp3_crit.dev_attr.attr,
606 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
607 &sensor_dev_attr_temp3_fault.dev_attr.attr,
608 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
609 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
610 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
611
612 NULL
613};
614
615static const struct attribute_group tmp432_group = {
616 .attrs = tmp432_attributes,
617};
618
619/*
620 * Additional features of the TMP461 chip.
621 * The TMP461 temperature offset for the remote channel.
622 */
623static SENSOR_DEVICE_ATTR_2(temp2_offset, S_IWUSR | S_IRUGO, show_temp,
624 store_temp, 6, 1);
625
626static struct attribute *tmp461_attributes[] = {
627 &sensor_dev_attr_temp2_offset.dev_attr.attr,
628 NULL
629};
630
631static const struct attribute_group tmp461_group = {
632 .attrs = tmp461_attributes,
633};
634
635/*
636 * Begin non sysfs callback code (aka Real code)
637 */
638
639static int tmp401_init_client(struct tmp401_data *data,
640 struct i2c_client *client)
641{
642 int config, config_orig, status = 0;
643
644 /* Set the conversion rate to 2 Hz */
645 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
646 data->update_interval = 500;
647
648 /* Start conversions (disable shutdown if necessary) */
649 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
650 if (config < 0)
651 return config;
652
653 config_orig = config;
654 config &= ~TMP401_CONFIG_SHUTDOWN;
655
656 if (config != config_orig)
657 status = i2c_smbus_write_byte_data(client,
658 TMP401_CONFIG_WRITE,
659 config);
660
661 return status;
662}
663
664static int tmp401_detect(struct i2c_client *client,
665 struct i2c_board_info *info)
666{
667 enum chips kind;
668 struct i2c_adapter *adapter = client->adapter;
669 u8 reg;
670
671 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
672 return -ENODEV;
673
674 /* Detect and identify the chip */
675 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
676 if (reg != TMP401_MANUFACTURER_ID)
677 return -ENODEV;
678
679 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
680
681 switch (reg) {
682 case TMP401_DEVICE_ID:
683 if (client->addr != 0x4c)
684 return -ENODEV;
685 kind = tmp401;
686 break;
687 case TMP411A_DEVICE_ID:
688 if (client->addr != 0x4c)
689 return -ENODEV;
690 kind = tmp411;
691 break;
692 case TMP411B_DEVICE_ID:
693 if (client->addr != 0x4d)
694 return -ENODEV;
695 kind = tmp411;
696 break;
697 case TMP411C_DEVICE_ID:
698 if (client->addr != 0x4e)
699 return -ENODEV;
700 kind = tmp411;
701 break;
702 case TMP431_DEVICE_ID:
703 if (client->addr != 0x4c && client->addr != 0x4d)
704 return -ENODEV;
705 kind = tmp431;
706 break;
707 case TMP432_DEVICE_ID:
708 if (client->addr != 0x4c && client->addr != 0x4d)
709 return -ENODEV;
710 kind = tmp432;
711 break;
712 case TMP435_DEVICE_ID:
713 kind = tmp435;
714 break;
715 default:
716 return -ENODEV;
717 }
718
719 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
720 if (reg & 0x1b)
721 return -ENODEV;
722
723 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
724 /* Datasheet says: 0x1-0x6 */
725 if (reg > 15)
726 return -ENODEV;
727
728 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
729
730 return 0;
731}
732
733static int tmp401_probe(struct i2c_client *client,
734 const struct i2c_device_id *id)
735{
736 static const char * const names[] = {
737 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
738 };
739 struct device *dev = &client->dev;
740 struct device *hwmon_dev;
741 struct tmp401_data *data;
742 int groups = 0, status;
743
744 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
745 if (!data)
746 return -ENOMEM;
747
748 data->client = client;
749 mutex_init(&data->update_lock);
750 data->kind = id->driver_data;
751
752 /* Initialize the TMP401 chip */
753 status = tmp401_init_client(data, client);
754 if (status < 0)
755 return status;
756
757 /* Register sysfs hooks */
758 data->groups[groups++] = &tmp401_group;
759
760 /* Register additional tmp411 sysfs hooks */
761 if (data->kind == tmp411)
762 data->groups[groups++] = &tmp411_group;
763
764 /* Register additional tmp432 sysfs hooks */
765 if (data->kind == tmp432)
766 data->groups[groups++] = &tmp432_group;
767
768 if (data->kind == tmp461)
769 data->groups[groups++] = &tmp461_group;
770
771 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
772 data, data->groups);
773 if (IS_ERR(hwmon_dev))
774 return PTR_ERR(hwmon_dev);
775
776 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
777
778 return 0;
779}
780
781static struct i2c_driver tmp401_driver = {
782 .class = I2C_CLASS_HWMON,
783 .driver = {
784 .name = "tmp401",
785 },
786 .probe = tmp401_probe,
787 .id_table = tmp401_id,
788 .detect = tmp401_detect,
789 .address_list = normal_i2c,
790};
791
792module_i2c_driver(tmp401_driver);
793
794MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
795MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
796MODULE_LICENSE("GPL");
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 */
47static const unsigned short normal_i2c[] = { 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
48
49enum chips { tmp401, tmp411, tmp431, tmp432 };
50
51/*
52 * The TMP401 registers, note some registers have different addresses for
53 * reading and writing
54 */
55#define TMP401_STATUS 0x02
56#define TMP401_CONFIG_READ 0x03
57#define TMP401_CONFIG_WRITE 0x09
58#define TMP401_CONVERSION_RATE_READ 0x04
59#define TMP401_CONVERSION_RATE_WRITE 0x0A
60#define TMP401_TEMP_CRIT_HYST 0x21
61#define TMP401_MANUFACTURER_ID_REG 0xFE
62#define TMP401_DEVICE_ID_REG 0xFF
63
64static const u8 TMP401_TEMP_MSB_READ[6][2] = {
65 { 0x00, 0x01 }, /* temp */
66 { 0x06, 0x08 }, /* low limit */
67 { 0x05, 0x07 }, /* high limit */
68 { 0x20, 0x19 }, /* therm (crit) limit */
69 { 0x30, 0x34 }, /* lowest */
70 { 0x32, 0x36 }, /* highest */
71};
72
73static const u8 TMP401_TEMP_MSB_WRITE[6][2] = {
74 { 0, 0 }, /* temp (unused) */
75 { 0x0C, 0x0E }, /* low limit */
76 { 0x0B, 0x0D }, /* high limit */
77 { 0x20, 0x19 }, /* therm (crit) limit */
78 { 0x30, 0x34 }, /* lowest */
79 { 0x32, 0x36 }, /* highest */
80};
81
82static const u8 TMP401_TEMP_LSB[6][2] = {
83 { 0x15, 0x10 }, /* temp */
84 { 0x17, 0x14 }, /* low limit */
85 { 0x16, 0x13 }, /* high limit */
86 { 0, 0 }, /* therm (crit) limit (unused) */
87 { 0x31, 0x35 }, /* lowest */
88 { 0x33, 0x37 }, /* highest */
89};
90
91static const u8 TMP432_TEMP_MSB_READ[4][3] = {
92 { 0x00, 0x01, 0x23 }, /* temp */
93 { 0x06, 0x08, 0x16 }, /* low limit */
94 { 0x05, 0x07, 0x15 }, /* high limit */
95 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
96};
97
98static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
99 { 0, 0, 0 }, /* temp - unused */
100 { 0x0C, 0x0E, 0x16 }, /* low limit */
101 { 0x0B, 0x0D, 0x15 }, /* high limit */
102 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
103};
104
105static const u8 TMP432_TEMP_LSB[3][3] = {
106 { 0x29, 0x10, 0x24 }, /* temp */
107 { 0x3E, 0x14, 0x18 }, /* low limit */
108 { 0x3D, 0x13, 0x17 }, /* high limit */
109};
110
111/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
112static const u8 TMP432_STATUS_REG[] = {
113 0x1b, 0x36, 0x35, 0x37 };
114
115/* Flags */
116#define TMP401_CONFIG_RANGE BIT(2)
117#define TMP401_CONFIG_SHUTDOWN BIT(6)
118#define TMP401_STATUS_LOCAL_CRIT BIT(0)
119#define TMP401_STATUS_REMOTE_CRIT BIT(1)
120#define TMP401_STATUS_REMOTE_OPEN BIT(2)
121#define TMP401_STATUS_REMOTE_LOW BIT(3)
122#define TMP401_STATUS_REMOTE_HIGH BIT(4)
123#define TMP401_STATUS_LOCAL_LOW BIT(5)
124#define TMP401_STATUS_LOCAL_HIGH BIT(6)
125
126/* On TMP432, each status has its own register */
127#define TMP432_STATUS_LOCAL BIT(0)
128#define TMP432_STATUS_REMOTE1 BIT(1)
129#define TMP432_STATUS_REMOTE2 BIT(2)
130
131/* Manufacturer / Device ID's */
132#define TMP401_MANUFACTURER_ID 0x55
133#define TMP401_DEVICE_ID 0x11
134#define TMP411A_DEVICE_ID 0x12
135#define TMP411B_DEVICE_ID 0x13
136#define TMP411C_DEVICE_ID 0x10
137#define TMP431_DEVICE_ID 0x31
138#define TMP432_DEVICE_ID 0x32
139
140/*
141 * Driver data (common to all clients)
142 */
143
144static const struct i2c_device_id tmp401_id[] = {
145 { "tmp401", tmp401 },
146 { "tmp411", tmp411 },
147 { "tmp431", tmp431 },
148 { "tmp432", tmp432 },
149 { }
150};
151MODULE_DEVICE_TABLE(i2c, tmp401_id);
152
153/*
154 * Client data (each client gets its own)
155 */
156
157struct tmp401_data {
158 struct i2c_client *client;
159 const struct attribute_group *groups[3];
160 struct mutex update_lock;
161 char valid; /* zero until following fields are valid */
162 unsigned long last_updated; /* in jiffies */
163 enum chips kind;
164
165 unsigned int update_interval; /* in milliseconds */
166
167 /* register values */
168 u8 status[4];
169 u8 config;
170 u16 temp[6][3];
171 u8 temp_crit_hyst;
172};
173
174/*
175 * Sysfs attr show / store functions
176 */
177
178static int tmp401_register_to_temp(u16 reg, u8 config)
179{
180 int temp = reg;
181
182 if (config & TMP401_CONFIG_RANGE)
183 temp -= 64 * 256;
184
185 return DIV_ROUND_CLOSEST(temp * 125, 32);
186}
187
188static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
189{
190 if (config & TMP401_CONFIG_RANGE) {
191 temp = clamp_val(temp, -64000, 191000);
192 temp += 64000;
193 } else
194 temp = clamp_val(temp, 0, 127000);
195
196 return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
197}
198
199static int tmp401_update_device_reg16(struct i2c_client *client,
200 struct tmp401_data *data)
201{
202 int i, j, val;
203 int num_regs = data->kind == tmp411 ? 6 : 4;
204 int num_sensors = data->kind == tmp432 ? 3 : 2;
205
206 for (i = 0; i < num_sensors; i++) { /* local / r1 / r2 */
207 for (j = 0; j < num_regs; j++) { /* temp / low / ... */
208 u8 regaddr;
209 /*
210 * High byte must be read first immediately followed
211 * by the low byte
212 */
213 regaddr = data->kind == tmp432 ?
214 TMP432_TEMP_MSB_READ[j][i] :
215 TMP401_TEMP_MSB_READ[j][i];
216 val = i2c_smbus_read_byte_data(client, regaddr);
217 if (val < 0)
218 return val;
219 data->temp[j][i] = val << 8;
220 if (j == 3) /* crit is msb only */
221 continue;
222 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[j][i]
223 : TMP401_TEMP_LSB[j][i];
224 val = i2c_smbus_read_byte_data(client, regaddr);
225 if (val < 0)
226 return val;
227 data->temp[j][i] |= val;
228 }
229 }
230 return 0;
231}
232
233static struct tmp401_data *tmp401_update_device(struct device *dev)
234{
235 struct tmp401_data *data = dev_get_drvdata(dev);
236 struct i2c_client *client = data->client;
237 struct tmp401_data *ret = data;
238 int i, val;
239 unsigned long next_update;
240
241 mutex_lock(&data->update_lock);
242
243 next_update = data->last_updated +
244 msecs_to_jiffies(data->update_interval);
245 if (time_after(jiffies, next_update) || !data->valid) {
246 if (data->kind != tmp432) {
247 /*
248 * The driver uses the TMP432 status format internally.
249 * Convert status to TMP432 format for other chips.
250 */
251 val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
252 if (val < 0) {
253 ret = ERR_PTR(val);
254 goto abort;
255 }
256 data->status[0] =
257 (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
258 data->status[1] =
259 ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
260 ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
261 data->status[2] =
262 ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
263 ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
264 data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
265 | TMP401_STATUS_REMOTE_CRIT);
266 } else {
267 for (i = 0; i < ARRAY_SIZE(data->status); i++) {
268 val = i2c_smbus_read_byte_data(client,
269 TMP432_STATUS_REG[i]);
270 if (val < 0) {
271 ret = ERR_PTR(val);
272 goto abort;
273 }
274 data->status[i] = val;
275 }
276 }
277
278 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
279 if (val < 0) {
280 ret = ERR_PTR(val);
281 goto abort;
282 }
283 data->config = val;
284 val = tmp401_update_device_reg16(client, data);
285 if (val < 0) {
286 ret = ERR_PTR(val);
287 goto abort;
288 }
289 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
290 if (val < 0) {
291 ret = ERR_PTR(val);
292 goto abort;
293 }
294 data->temp_crit_hyst = val;
295
296 data->last_updated = jiffies;
297 data->valid = 1;
298 }
299
300abort:
301 mutex_unlock(&data->update_lock);
302 return ret;
303}
304
305static ssize_t show_temp(struct device *dev,
306 struct device_attribute *devattr, char *buf)
307{
308 int nr = to_sensor_dev_attr_2(devattr)->nr;
309 int index = to_sensor_dev_attr_2(devattr)->index;
310 struct tmp401_data *data = tmp401_update_device(dev);
311
312 if (IS_ERR(data))
313 return PTR_ERR(data);
314
315 return sprintf(buf, "%d\n",
316 tmp401_register_to_temp(data->temp[nr][index], data->config));
317}
318
319static ssize_t show_temp_crit_hyst(struct device *dev,
320 struct device_attribute *devattr, char *buf)
321{
322 int temp, index = to_sensor_dev_attr(devattr)->index;
323 struct tmp401_data *data = tmp401_update_device(dev);
324
325 if (IS_ERR(data))
326 return PTR_ERR(data);
327
328 mutex_lock(&data->update_lock);
329 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
330 temp -= data->temp_crit_hyst * 1000;
331 mutex_unlock(&data->update_lock);
332
333 return sprintf(buf, "%d\n", temp);
334}
335
336static ssize_t show_status(struct device *dev,
337 struct device_attribute *devattr, char *buf)
338{
339 int nr = to_sensor_dev_attr_2(devattr)->nr;
340 int mask = to_sensor_dev_attr_2(devattr)->index;
341 struct tmp401_data *data = tmp401_update_device(dev);
342
343 if (IS_ERR(data))
344 return PTR_ERR(data);
345
346 return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
347}
348
349static ssize_t store_temp(struct device *dev, struct device_attribute *devattr,
350 const char *buf, size_t count)
351{
352 int nr = to_sensor_dev_attr_2(devattr)->nr;
353 int index = to_sensor_dev_attr_2(devattr)->index;
354 struct tmp401_data *data = dev_get_drvdata(dev);
355 struct i2c_client *client = data->client;
356 long val;
357 u16 reg;
358 u8 regaddr;
359
360 if (kstrtol(buf, 10, &val))
361 return -EINVAL;
362
363 reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
364
365 mutex_lock(&data->update_lock);
366
367 regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
368 : TMP401_TEMP_MSB_WRITE[nr][index];
369 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
370 if (nr != 3) {
371 regaddr = data->kind == tmp432 ? TMP432_TEMP_LSB[nr][index]
372 : TMP401_TEMP_LSB[nr][index];
373 i2c_smbus_write_byte_data(client, regaddr, reg & 0xFF);
374 }
375 data->temp[nr][index] = reg;
376
377 mutex_unlock(&data->update_lock);
378
379 return count;
380}
381
382static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
383 *devattr, const char *buf, size_t count)
384{
385 int temp, index = to_sensor_dev_attr(devattr)->index;
386 struct tmp401_data *data = tmp401_update_device(dev);
387 long val;
388 u8 reg;
389
390 if (IS_ERR(data))
391 return PTR_ERR(data);
392
393 if (kstrtol(buf, 10, &val))
394 return -EINVAL;
395
396 if (data->config & TMP401_CONFIG_RANGE)
397 val = clamp_val(val, -64000, 191000);
398 else
399 val = clamp_val(val, 0, 127000);
400
401 mutex_lock(&data->update_lock);
402 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
403 val = clamp_val(val, temp - 255000, temp);
404 reg = ((temp - val) + 500) / 1000;
405
406 i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
407 reg);
408
409 data->temp_crit_hyst = reg;
410
411 mutex_unlock(&data->update_lock);
412
413 return count;
414}
415
416/*
417 * Resets the historical measurements of minimum and maximum temperatures.
418 * This is done by writing any value to any of the minimum/maximum registers
419 * (0x30-0x37).
420 */
421static ssize_t reset_temp_history(struct device *dev,
422 struct device_attribute *devattr, const char *buf, size_t count)
423{
424 struct tmp401_data *data = dev_get_drvdata(dev);
425 struct i2c_client *client = data->client;
426 long val;
427
428 if (kstrtol(buf, 10, &val))
429 return -EINVAL;
430
431 if (val != 1) {
432 dev_err(dev,
433 "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
434 val);
435 return -EINVAL;
436 }
437 mutex_lock(&data->update_lock);
438 i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
439 data->valid = 0;
440 mutex_unlock(&data->update_lock);
441
442 return count;
443}
444
445static ssize_t show_update_interval(struct device *dev,
446 struct device_attribute *attr, char *buf)
447{
448 struct tmp401_data *data = dev_get_drvdata(dev);
449
450 return sprintf(buf, "%u\n", data->update_interval);
451}
452
453static ssize_t set_update_interval(struct device *dev,
454 struct device_attribute *attr,
455 const char *buf, size_t count)
456{
457 struct tmp401_data *data = dev_get_drvdata(dev);
458 struct i2c_client *client = data->client;
459 unsigned long val;
460 int err, rate;
461
462 err = kstrtoul(buf, 10, &val);
463 if (err)
464 return err;
465
466 /*
467 * For valid rates, interval can be calculated as
468 * interval = (1 << (7 - rate)) * 125;
469 * Rounded rate is therefore
470 * rate = 7 - __fls(interval * 4 / (125 * 3));
471 * Use clamp_val() to avoid overflows, and to ensure valid input
472 * for __fls.
473 */
474 val = clamp_val(val, 125, 16000);
475 rate = 7 - __fls(val * 4 / (125 * 3));
476 mutex_lock(&data->update_lock);
477 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
478 data->update_interval = (1 << (7 - rate)) * 125;
479 mutex_unlock(&data->update_lock);
480
481 return count;
482}
483
484static SENSOR_DEVICE_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0);
485static SENSOR_DEVICE_ATTR_2(temp1_min, S_IWUSR | S_IRUGO, show_temp,
486 store_temp, 1, 0);
487static SENSOR_DEVICE_ATTR_2(temp1_max, S_IWUSR | S_IRUGO, show_temp,
488 store_temp, 2, 0);
489static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IWUSR | S_IRUGO, show_temp,
490 store_temp, 3, 0);
491static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO,
492 show_temp_crit_hyst, store_temp_crit_hyst, 0);
493static SENSOR_DEVICE_ATTR_2(temp1_min_alarm, S_IRUGO, show_status, NULL,
494 1, TMP432_STATUS_LOCAL);
495static SENSOR_DEVICE_ATTR_2(temp1_max_alarm, S_IRUGO, show_status, NULL,
496 2, TMP432_STATUS_LOCAL);
497static SENSOR_DEVICE_ATTR_2(temp1_crit_alarm, S_IRUGO, show_status, NULL,
498 3, TMP432_STATUS_LOCAL);
499static SENSOR_DEVICE_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 0, 1);
500static SENSOR_DEVICE_ATTR_2(temp2_min, S_IWUSR | S_IRUGO, show_temp,
501 store_temp, 1, 1);
502static SENSOR_DEVICE_ATTR_2(temp2_max, S_IWUSR | S_IRUGO, show_temp,
503 store_temp, 2, 1);
504static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IWUSR | S_IRUGO, show_temp,
505 store_temp, 3, 1);
506static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst,
507 NULL, 1);
508static SENSOR_DEVICE_ATTR_2(temp2_fault, S_IRUGO, show_status, NULL,
509 0, TMP432_STATUS_REMOTE1);
510static SENSOR_DEVICE_ATTR_2(temp2_min_alarm, S_IRUGO, show_status, NULL,
511 1, TMP432_STATUS_REMOTE1);
512static SENSOR_DEVICE_ATTR_2(temp2_max_alarm, S_IRUGO, show_status, NULL,
513 2, TMP432_STATUS_REMOTE1);
514static SENSOR_DEVICE_ATTR_2(temp2_crit_alarm, S_IRUGO, show_status, NULL,
515 3, TMP432_STATUS_REMOTE1);
516
517static DEVICE_ATTR(update_interval, S_IRUGO | S_IWUSR, show_update_interval,
518 set_update_interval);
519
520static struct attribute *tmp401_attributes[] = {
521 &sensor_dev_attr_temp1_input.dev_attr.attr,
522 &sensor_dev_attr_temp1_min.dev_attr.attr,
523 &sensor_dev_attr_temp1_max.dev_attr.attr,
524 &sensor_dev_attr_temp1_crit.dev_attr.attr,
525 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
526 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
527 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
528 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
529
530 &sensor_dev_attr_temp2_input.dev_attr.attr,
531 &sensor_dev_attr_temp2_min.dev_attr.attr,
532 &sensor_dev_attr_temp2_max.dev_attr.attr,
533 &sensor_dev_attr_temp2_crit.dev_attr.attr,
534 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
535 &sensor_dev_attr_temp2_fault.dev_attr.attr,
536 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
537 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
538 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
539
540 &dev_attr_update_interval.attr,
541
542 NULL
543};
544
545static const struct attribute_group tmp401_group = {
546 .attrs = tmp401_attributes,
547};
548
549/*
550 * Additional features of the TMP411 chip.
551 * The TMP411 stores the minimum and maximum
552 * temperature measured since power-on, chip-reset, or
553 * minimum and maximum register reset for both the local
554 * and remote channels.
555 */
556static SENSOR_DEVICE_ATTR_2(temp1_lowest, S_IRUGO, show_temp, NULL, 4, 0);
557static SENSOR_DEVICE_ATTR_2(temp1_highest, S_IRUGO, show_temp, NULL, 5, 0);
558static SENSOR_DEVICE_ATTR_2(temp2_lowest, S_IRUGO, show_temp, NULL, 4, 1);
559static SENSOR_DEVICE_ATTR_2(temp2_highest, S_IRUGO, show_temp, NULL, 5, 1);
560static SENSOR_DEVICE_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history,
561 0);
562
563static struct attribute *tmp411_attributes[] = {
564 &sensor_dev_attr_temp1_highest.dev_attr.attr,
565 &sensor_dev_attr_temp1_lowest.dev_attr.attr,
566 &sensor_dev_attr_temp2_highest.dev_attr.attr,
567 &sensor_dev_attr_temp2_lowest.dev_attr.attr,
568 &sensor_dev_attr_temp_reset_history.dev_attr.attr,
569 NULL
570};
571
572static const struct attribute_group tmp411_group = {
573 .attrs = tmp411_attributes,
574};
575
576static SENSOR_DEVICE_ATTR_2(temp3_input, S_IRUGO, show_temp, NULL, 0, 2);
577static SENSOR_DEVICE_ATTR_2(temp3_min, S_IWUSR | S_IRUGO, show_temp,
578 store_temp, 1, 2);
579static SENSOR_DEVICE_ATTR_2(temp3_max, S_IWUSR | S_IRUGO, show_temp,
580 store_temp, 2, 2);
581static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IWUSR | S_IRUGO, show_temp,
582 store_temp, 3, 2);
583static SENSOR_DEVICE_ATTR(temp3_crit_hyst, S_IRUGO, show_temp_crit_hyst,
584 NULL, 2);
585static SENSOR_DEVICE_ATTR_2(temp3_fault, S_IRUGO, show_status, NULL,
586 0, TMP432_STATUS_REMOTE2);
587static SENSOR_DEVICE_ATTR_2(temp3_min_alarm, S_IRUGO, show_status, NULL,
588 1, TMP432_STATUS_REMOTE2);
589static SENSOR_DEVICE_ATTR_2(temp3_max_alarm, S_IRUGO, show_status, NULL,
590 2, TMP432_STATUS_REMOTE2);
591static SENSOR_DEVICE_ATTR_2(temp3_crit_alarm, S_IRUGO, show_status, NULL,
592 3, TMP432_STATUS_REMOTE2);
593
594static struct attribute *tmp432_attributes[] = {
595 &sensor_dev_attr_temp3_input.dev_attr.attr,
596 &sensor_dev_attr_temp3_min.dev_attr.attr,
597 &sensor_dev_attr_temp3_max.dev_attr.attr,
598 &sensor_dev_attr_temp3_crit.dev_attr.attr,
599 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
600 &sensor_dev_attr_temp3_fault.dev_attr.attr,
601 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
602 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
603 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
604
605 NULL
606};
607
608static const struct attribute_group tmp432_group = {
609 .attrs = tmp432_attributes,
610};
611
612/*
613 * Begin non sysfs callback code (aka Real code)
614 */
615
616static void tmp401_init_client(struct tmp401_data *data,
617 struct i2c_client *client)
618{
619 int config, config_orig;
620
621 /* Set the conversion rate to 2 Hz */
622 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
623 data->update_interval = 500;
624
625 /* Start conversions (disable shutdown if necessary) */
626 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
627 if (config < 0) {
628 dev_warn(&client->dev, "Initialization failed!\n");
629 return;
630 }
631
632 config_orig = config;
633 config &= ~TMP401_CONFIG_SHUTDOWN;
634
635 if (config != config_orig)
636 i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
637}
638
639static int tmp401_detect(struct i2c_client *client,
640 struct i2c_board_info *info)
641{
642 enum chips kind;
643 struct i2c_adapter *adapter = client->adapter;
644 u8 reg;
645
646 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
647 return -ENODEV;
648
649 /* Detect and identify the chip */
650 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
651 if (reg != TMP401_MANUFACTURER_ID)
652 return -ENODEV;
653
654 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
655
656 switch (reg) {
657 case TMP401_DEVICE_ID:
658 if (client->addr != 0x4c)
659 return -ENODEV;
660 kind = tmp401;
661 break;
662 case TMP411A_DEVICE_ID:
663 if (client->addr != 0x4c)
664 return -ENODEV;
665 kind = tmp411;
666 break;
667 case TMP411B_DEVICE_ID:
668 if (client->addr != 0x4d)
669 return -ENODEV;
670 kind = tmp411;
671 break;
672 case TMP411C_DEVICE_ID:
673 if (client->addr != 0x4e)
674 return -ENODEV;
675 kind = tmp411;
676 break;
677 case TMP431_DEVICE_ID:
678 if (client->addr == 0x4e)
679 return -ENODEV;
680 kind = tmp431;
681 break;
682 case TMP432_DEVICE_ID:
683 if (client->addr == 0x4e)
684 return -ENODEV;
685 kind = tmp432;
686 break;
687 default:
688 return -ENODEV;
689 }
690
691 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
692 if (reg & 0x1b)
693 return -ENODEV;
694
695 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
696 /* Datasheet says: 0x1-0x6 */
697 if (reg > 15)
698 return -ENODEV;
699
700 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
701
702 return 0;
703}
704
705static int tmp401_probe(struct i2c_client *client,
706 const struct i2c_device_id *id)
707{
708 const char *names[] = { "TMP401", "TMP411", "TMP431", "TMP432" };
709 struct device *dev = &client->dev;
710 struct device *hwmon_dev;
711 struct tmp401_data *data;
712 int groups = 0;
713
714 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
715 if (!data)
716 return -ENOMEM;
717
718 data->client = client;
719 mutex_init(&data->update_lock);
720 data->kind = id->driver_data;
721
722 /* Initialize the TMP401 chip */
723 tmp401_init_client(data, client);
724
725 /* Register sysfs hooks */
726 data->groups[groups++] = &tmp401_group;
727
728 /* Register additional tmp411 sysfs hooks */
729 if (data->kind == tmp411)
730 data->groups[groups++] = &tmp411_group;
731
732 /* Register additional tmp432 sysfs hooks */
733 if (data->kind == tmp432)
734 data->groups[groups++] = &tmp432_group;
735
736 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
737 data, data->groups);
738 if (IS_ERR(hwmon_dev))
739 return PTR_ERR(hwmon_dev);
740
741 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
742
743 return 0;
744}
745
746static struct i2c_driver tmp401_driver = {
747 .class = I2C_CLASS_HWMON,
748 .driver = {
749 .name = "tmp401",
750 },
751 .probe = tmp401_probe,
752 .id_table = tmp401_id,
753 .detect = tmp401_detect,
754 .address_list = normal_i2c,
755};
756
757module_i2c_driver(tmp401_driver);
758
759MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
760MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
761MODULE_LICENSE("GPL");