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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* tmp401.c
3 *
4 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>
5 * Preliminary tmp411 support by:
6 * Gabriel Konat, Sander Leget, Wouter Willems
7 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>
8 *
9 * Cleanup and support for TMP431 and TMP432 by Guenter Roeck
10 * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>
11 */
12
13/*
14 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
15 *
16 * Note this IC is in some aspect similar to the LM90, but it has quite a
17 * few differences too, for example the local temp has a higher resolution
18 * and thus has 16 bits registers for its value and limit instead of 8 bits.
19 */
20
21#include <linux/module.h>
22#include <linux/init.h>
23#include <linux/bitops.h>
24#include <linux/slab.h>
25#include <linux/jiffies.h>
26#include <linux/i2c.h>
27#include <linux/hwmon.h>
28#include <linux/hwmon-sysfs.h>
29#include <linux/err.h>
30#include <linux/mutex.h>
31#include <linux/sysfs.h>
32
33/* Addresses to scan */
34static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,
35 0x4e, 0x4f, I2C_CLIENT_END };
36
37enum chips { tmp401, tmp411, tmp431, tmp432, tmp435, tmp461 };
38
39/*
40 * The TMP401 registers, note some registers have different addresses for
41 * reading and writing
42 */
43#define TMP401_STATUS 0x02
44#define TMP401_CONFIG_READ 0x03
45#define TMP401_CONFIG_WRITE 0x09
46#define TMP401_CONVERSION_RATE_READ 0x04
47#define TMP401_CONVERSION_RATE_WRITE 0x0A
48#define TMP401_TEMP_CRIT_HYST 0x21
49#define TMP401_MANUFACTURER_ID_REG 0xFE
50#define TMP401_DEVICE_ID_REG 0xFF
51
52static const u8 TMP401_TEMP_MSB_READ[7][2] = {
53 { 0x00, 0x01 }, /* temp */
54 { 0x06, 0x08 }, /* low limit */
55 { 0x05, 0x07 }, /* high limit */
56 { 0x20, 0x19 }, /* therm (crit) limit */
57 { 0x30, 0x34 }, /* lowest */
58 { 0x32, 0x36 }, /* highest */
59 { 0, 0x11 }, /* offset */
60};
61
62static const u8 TMP401_TEMP_MSB_WRITE[7][2] = {
63 { 0, 0 }, /* temp (unused) */
64 { 0x0C, 0x0E }, /* low limit */
65 { 0x0B, 0x0D }, /* high limit */
66 { 0x20, 0x19 }, /* therm (crit) limit */
67 { 0x30, 0x34 }, /* lowest */
68 { 0x32, 0x36 }, /* highest */
69 { 0, 0x11 }, /* offset */
70};
71
72static const u8 TMP432_TEMP_MSB_READ[4][3] = {
73 { 0x00, 0x01, 0x23 }, /* temp */
74 { 0x06, 0x08, 0x16 }, /* low limit */
75 { 0x05, 0x07, 0x15 }, /* high limit */
76 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
77};
78
79static const u8 TMP432_TEMP_MSB_WRITE[4][3] = {
80 { 0, 0, 0 }, /* temp - unused */
81 { 0x0C, 0x0E, 0x16 }, /* low limit */
82 { 0x0B, 0x0D, 0x15 }, /* high limit */
83 { 0x20, 0x19, 0x1A }, /* therm (crit) limit */
84};
85
86/* [0] = fault, [1] = low, [2] = high, [3] = therm/crit */
87static const u8 TMP432_STATUS_REG[] = {
88 0x1b, 0x36, 0x35, 0x37 };
89
90/* Flags */
91#define TMP401_CONFIG_RANGE BIT(2)
92#define TMP401_CONFIG_SHUTDOWN BIT(6)
93#define TMP401_STATUS_LOCAL_CRIT BIT(0)
94#define TMP401_STATUS_REMOTE_CRIT BIT(1)
95#define TMP401_STATUS_REMOTE_OPEN BIT(2)
96#define TMP401_STATUS_REMOTE_LOW BIT(3)
97#define TMP401_STATUS_REMOTE_HIGH BIT(4)
98#define TMP401_STATUS_LOCAL_LOW BIT(5)
99#define TMP401_STATUS_LOCAL_HIGH BIT(6)
100
101/* On TMP432, each status has its own register */
102#define TMP432_STATUS_LOCAL BIT(0)
103#define TMP432_STATUS_REMOTE1 BIT(1)
104#define TMP432_STATUS_REMOTE2 BIT(2)
105
106/* Manufacturer / Device ID's */
107#define TMP401_MANUFACTURER_ID 0x55
108#define TMP401_DEVICE_ID 0x11
109#define TMP411A_DEVICE_ID 0x12
110#define TMP411B_DEVICE_ID 0x13
111#define TMP411C_DEVICE_ID 0x10
112#define TMP431_DEVICE_ID 0x31
113#define TMP432_DEVICE_ID 0x32
114#define TMP435_DEVICE_ID 0x35
115
116/*
117 * Driver data (common to all clients)
118 */
119
120static const struct i2c_device_id tmp401_id[] = {
121 { "tmp401", tmp401 },
122 { "tmp411", tmp411 },
123 { "tmp431", tmp431 },
124 { "tmp432", tmp432 },
125 { "tmp435", tmp435 },
126 { "tmp461", tmp461 },
127 { }
128};
129MODULE_DEVICE_TABLE(i2c, tmp401_id);
130
131/*
132 * Client data (each client gets its own)
133 */
134
135struct tmp401_data {
136 struct i2c_client *client;
137 const struct attribute_group *groups[3];
138 struct mutex update_lock;
139 char valid; /* zero until following fields are valid */
140 unsigned long last_updated; /* in jiffies */
141 enum chips kind;
142
143 unsigned int update_interval; /* in milliseconds */
144
145 /* register values */
146 u8 status[4];
147 u8 config;
148 u16 temp[7][3];
149 u8 temp_crit_hyst;
150};
151
152/*
153 * Sysfs attr show / store functions
154 */
155
156static int tmp401_register_to_temp(u16 reg, u8 config)
157{
158 int temp = reg;
159
160 if (config & TMP401_CONFIG_RANGE)
161 temp -= 64 * 256;
162
163 return DIV_ROUND_CLOSEST(temp * 125, 32);
164}
165
166static u16 tmp401_temp_to_register(long temp, u8 config, int zbits)
167{
168 if (config & TMP401_CONFIG_RANGE) {
169 temp = clamp_val(temp, -64000, 191000);
170 temp += 64000;
171 } else
172 temp = clamp_val(temp, 0, 127000);
173
174 return DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
175}
176
177static int tmp401_update_device_reg16(struct i2c_client *client,
178 struct tmp401_data *data)
179{
180 int i, j, val;
181 int num_regs = data->kind == tmp411 ? 6 : 4;
182 int num_sensors = data->kind == tmp432 ? 3 : 2;
183
184 for (i = 0; i < num_sensors; i++) { /* local / r1 / r2 */
185 for (j = 0; j < num_regs; j++) { /* temp / low / ... */
186 u8 regaddr;
187
188 regaddr = data->kind == tmp432 ?
189 TMP432_TEMP_MSB_READ[j][i] :
190 TMP401_TEMP_MSB_READ[j][i];
191 if (j == 3) { /* crit is msb only */
192 val = i2c_smbus_read_byte_data(client, regaddr);
193 } else {
194 val = i2c_smbus_read_word_swapped(client,
195 regaddr);
196 }
197 if (val < 0)
198 return val;
199
200 data->temp[j][i] = j == 3 ? val << 8 : val;
201 }
202 }
203 return 0;
204}
205
206static struct tmp401_data *tmp401_update_device(struct device *dev)
207{
208 struct tmp401_data *data = dev_get_drvdata(dev);
209 struct i2c_client *client = data->client;
210 struct tmp401_data *ret = data;
211 int i, val;
212 unsigned long next_update;
213
214 mutex_lock(&data->update_lock);
215
216 next_update = data->last_updated +
217 msecs_to_jiffies(data->update_interval);
218 if (time_after(jiffies, next_update) || !data->valid) {
219 if (data->kind != tmp432) {
220 /*
221 * The driver uses the TMP432 status format internally.
222 * Convert status to TMP432 format for other chips.
223 */
224 val = i2c_smbus_read_byte_data(client, TMP401_STATUS);
225 if (val < 0) {
226 ret = ERR_PTR(val);
227 goto abort;
228 }
229 data->status[0] =
230 (val & TMP401_STATUS_REMOTE_OPEN) >> 1;
231 data->status[1] =
232 ((val & TMP401_STATUS_REMOTE_LOW) >> 2) |
233 ((val & TMP401_STATUS_LOCAL_LOW) >> 5);
234 data->status[2] =
235 ((val & TMP401_STATUS_REMOTE_HIGH) >> 3) |
236 ((val & TMP401_STATUS_LOCAL_HIGH) >> 6);
237 data->status[3] = val & (TMP401_STATUS_LOCAL_CRIT
238 | TMP401_STATUS_REMOTE_CRIT);
239 } else {
240 for (i = 0; i < ARRAY_SIZE(data->status); i++) {
241 val = i2c_smbus_read_byte_data(client,
242 TMP432_STATUS_REG[i]);
243 if (val < 0) {
244 ret = ERR_PTR(val);
245 goto abort;
246 }
247 data->status[i] = val;
248 }
249 }
250
251 val = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
252 if (val < 0) {
253 ret = ERR_PTR(val);
254 goto abort;
255 }
256 data->config = val;
257 val = tmp401_update_device_reg16(client, data);
258 if (val < 0) {
259 ret = ERR_PTR(val);
260 goto abort;
261 }
262 val = i2c_smbus_read_byte_data(client, TMP401_TEMP_CRIT_HYST);
263 if (val < 0) {
264 ret = ERR_PTR(val);
265 goto abort;
266 }
267 data->temp_crit_hyst = val;
268
269 data->last_updated = jiffies;
270 data->valid = 1;
271 }
272
273abort:
274 mutex_unlock(&data->update_lock);
275 return ret;
276}
277
278static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
279 char *buf)
280{
281 int nr = to_sensor_dev_attr_2(devattr)->nr;
282 int index = to_sensor_dev_attr_2(devattr)->index;
283 struct tmp401_data *data = tmp401_update_device(dev);
284
285 if (IS_ERR(data))
286 return PTR_ERR(data);
287
288 return sprintf(buf, "%d\n",
289 tmp401_register_to_temp(data->temp[nr][index], data->config));
290}
291
292static ssize_t temp_crit_hyst_show(struct device *dev,
293 struct device_attribute *devattr,
294 char *buf)
295{
296 int temp, index = to_sensor_dev_attr(devattr)->index;
297 struct tmp401_data *data = tmp401_update_device(dev);
298
299 if (IS_ERR(data))
300 return PTR_ERR(data);
301
302 mutex_lock(&data->update_lock);
303 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
304 temp -= data->temp_crit_hyst * 1000;
305 mutex_unlock(&data->update_lock);
306
307 return sprintf(buf, "%d\n", temp);
308}
309
310static ssize_t status_show(struct device *dev,
311 struct device_attribute *devattr, char *buf)
312{
313 int nr = to_sensor_dev_attr_2(devattr)->nr;
314 int mask = to_sensor_dev_attr_2(devattr)->index;
315 struct tmp401_data *data = tmp401_update_device(dev);
316
317 if (IS_ERR(data))
318 return PTR_ERR(data);
319
320 return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
321}
322
323static ssize_t temp_store(struct device *dev,
324 struct device_attribute *devattr, const char *buf,
325 size_t count)
326{
327 int nr = to_sensor_dev_attr_2(devattr)->nr;
328 int index = to_sensor_dev_attr_2(devattr)->index;
329 struct tmp401_data *data = dev_get_drvdata(dev);
330 struct i2c_client *client = data->client;
331 long val;
332 u16 reg;
333 u8 regaddr;
334
335 if (kstrtol(buf, 10, &val))
336 return -EINVAL;
337
338 reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
339
340 mutex_lock(&data->update_lock);
341
342 regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
343 : TMP401_TEMP_MSB_WRITE[nr][index];
344 if (nr == 3) { /* crit is msb only */
345 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
346 } else {
347 /* Hardware expects big endian data --> use _swapped */
348 i2c_smbus_write_word_swapped(client, regaddr, reg);
349 }
350 data->temp[nr][index] = reg;
351
352 mutex_unlock(&data->update_lock);
353
354 return count;
355}
356
357static ssize_t temp_crit_hyst_store(struct device *dev,
358 struct device_attribute *devattr,
359 const char *buf, size_t count)
360{
361 int temp, index = to_sensor_dev_attr(devattr)->index;
362 struct tmp401_data *data = tmp401_update_device(dev);
363 long val;
364 u8 reg;
365
366 if (IS_ERR(data))
367 return PTR_ERR(data);
368
369 if (kstrtol(buf, 10, &val))
370 return -EINVAL;
371
372 if (data->config & TMP401_CONFIG_RANGE)
373 val = clamp_val(val, -64000, 191000);
374 else
375 val = clamp_val(val, 0, 127000);
376
377 mutex_lock(&data->update_lock);
378 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
379 val = clamp_val(val, temp - 255000, temp);
380 reg = ((temp - val) + 500) / 1000;
381
382 i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
383 reg);
384
385 data->temp_crit_hyst = reg;
386
387 mutex_unlock(&data->update_lock);
388
389 return count;
390}
391
392/*
393 * Resets the historical measurements of minimum and maximum temperatures.
394 * This is done by writing any value to any of the minimum/maximum registers
395 * (0x30-0x37).
396 */
397static ssize_t reset_temp_history_store(struct device *dev,
398 struct device_attribute *devattr,
399 const char *buf, size_t count)
400{
401 struct tmp401_data *data = dev_get_drvdata(dev);
402 struct i2c_client *client = data->client;
403 long val;
404
405 if (kstrtol(buf, 10, &val))
406 return -EINVAL;
407
408 if (val != 1) {
409 dev_err(dev,
410 "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
411 val);
412 return -EINVAL;
413 }
414 mutex_lock(&data->update_lock);
415 i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
416 data->valid = 0;
417 mutex_unlock(&data->update_lock);
418
419 return count;
420}
421
422static ssize_t update_interval_show(struct device *dev,
423 struct device_attribute *attr, char *buf)
424{
425 struct tmp401_data *data = dev_get_drvdata(dev);
426
427 return sprintf(buf, "%u\n", data->update_interval);
428}
429
430static ssize_t update_interval_store(struct device *dev,
431 struct device_attribute *attr,
432 const char *buf, size_t count)
433{
434 struct tmp401_data *data = dev_get_drvdata(dev);
435 struct i2c_client *client = data->client;
436 unsigned long val;
437 int err, rate;
438
439 err = kstrtoul(buf, 10, &val);
440 if (err)
441 return err;
442
443 /*
444 * For valid rates, interval can be calculated as
445 * interval = (1 << (7 - rate)) * 125;
446 * Rounded rate is therefore
447 * rate = 7 - __fls(interval * 4 / (125 * 3));
448 * Use clamp_val() to avoid overflows, and to ensure valid input
449 * for __fls.
450 */
451 val = clamp_val(val, 125, 16000);
452 rate = 7 - __fls(val * 4 / (125 * 3));
453 mutex_lock(&data->update_lock);
454 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
455 data->update_interval = (1 << (7 - rate)) * 125;
456 mutex_unlock(&data->update_lock);
457
458 return count;
459}
460
461static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, 0);
462static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 1, 0);
463static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 2, 0);
464static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 3, 0);
465static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp_crit_hyst, 0);
466static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, status, 1,
467 TMP432_STATUS_LOCAL);
468static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, status, 2,
469 TMP432_STATUS_LOCAL);
470static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, status, 3,
471 TMP432_STATUS_LOCAL);
472static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0, 1);
473static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, 1);
474static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 2, 1);
475static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 3, 1);
476static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, temp_crit_hyst, 1);
477static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, status, 0, TMP432_STATUS_REMOTE1);
478static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, status, 1,
479 TMP432_STATUS_REMOTE1);
480static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, status, 2,
481 TMP432_STATUS_REMOTE1);
482static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, status, 3,
483 TMP432_STATUS_REMOTE1);
484
485static DEVICE_ATTR_RW(update_interval);
486
487static struct attribute *tmp401_attributes[] = {
488 &sensor_dev_attr_temp1_input.dev_attr.attr,
489 &sensor_dev_attr_temp1_min.dev_attr.attr,
490 &sensor_dev_attr_temp1_max.dev_attr.attr,
491 &sensor_dev_attr_temp1_crit.dev_attr.attr,
492 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
493 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
494 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
495 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
496
497 &sensor_dev_attr_temp2_input.dev_attr.attr,
498 &sensor_dev_attr_temp2_min.dev_attr.attr,
499 &sensor_dev_attr_temp2_max.dev_attr.attr,
500 &sensor_dev_attr_temp2_crit.dev_attr.attr,
501 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
502 &sensor_dev_attr_temp2_fault.dev_attr.attr,
503 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
504 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
505 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
506
507 &dev_attr_update_interval.attr,
508
509 NULL
510};
511
512static const struct attribute_group tmp401_group = {
513 .attrs = tmp401_attributes,
514};
515
516/*
517 * Additional features of the TMP411 chip.
518 * The TMP411 stores the minimum and maximum
519 * temperature measured since power-on, chip-reset, or
520 * minimum and maximum register reset for both the local
521 * and remote channels.
522 */
523static SENSOR_DEVICE_ATTR_2_RO(temp1_lowest, temp, 4, 0);
524static SENSOR_DEVICE_ATTR_2_RO(temp1_highest, temp, 5, 0);
525static SENSOR_DEVICE_ATTR_2_RO(temp2_lowest, temp, 4, 1);
526static SENSOR_DEVICE_ATTR_2_RO(temp2_highest, temp, 5, 1);
527static SENSOR_DEVICE_ATTR_WO(temp_reset_history, reset_temp_history, 0);
528
529static struct attribute *tmp411_attributes[] = {
530 &sensor_dev_attr_temp1_highest.dev_attr.attr,
531 &sensor_dev_attr_temp1_lowest.dev_attr.attr,
532 &sensor_dev_attr_temp2_highest.dev_attr.attr,
533 &sensor_dev_attr_temp2_lowest.dev_attr.attr,
534 &sensor_dev_attr_temp_reset_history.dev_attr.attr,
535 NULL
536};
537
538static const struct attribute_group tmp411_group = {
539 .attrs = tmp411_attributes,
540};
541
542static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0, 2);
543static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 1, 2);
544static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, 2);
545static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 3, 2);
546static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, temp_crit_hyst, 2);
547static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, status, 0, TMP432_STATUS_REMOTE2);
548static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, status, 1,
549 TMP432_STATUS_REMOTE2);
550static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, status, 2,
551 TMP432_STATUS_REMOTE2);
552static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, status, 3,
553 TMP432_STATUS_REMOTE2);
554
555static struct attribute *tmp432_attributes[] = {
556 &sensor_dev_attr_temp3_input.dev_attr.attr,
557 &sensor_dev_attr_temp3_min.dev_attr.attr,
558 &sensor_dev_attr_temp3_max.dev_attr.attr,
559 &sensor_dev_attr_temp3_crit.dev_attr.attr,
560 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
561 &sensor_dev_attr_temp3_fault.dev_attr.attr,
562 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
563 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
564 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
565
566 NULL
567};
568
569static const struct attribute_group tmp432_group = {
570 .attrs = tmp432_attributes,
571};
572
573/*
574 * Additional features of the TMP461 chip.
575 * The TMP461 temperature offset for the remote channel.
576 */
577static SENSOR_DEVICE_ATTR_2_RW(temp2_offset, temp, 6, 1);
578
579static struct attribute *tmp461_attributes[] = {
580 &sensor_dev_attr_temp2_offset.dev_attr.attr,
581 NULL
582};
583
584static const struct attribute_group tmp461_group = {
585 .attrs = tmp461_attributes,
586};
587
588/*
589 * Begin non sysfs callback code (aka Real code)
590 */
591
592static int tmp401_init_client(struct tmp401_data *data,
593 struct i2c_client *client)
594{
595 int config, config_orig, status = 0;
596
597 /* Set the conversion rate to 2 Hz */
598 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
599 data->update_interval = 500;
600
601 /* Start conversions (disable shutdown if necessary) */
602 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
603 if (config < 0)
604 return config;
605
606 config_orig = config;
607 config &= ~TMP401_CONFIG_SHUTDOWN;
608
609 if (config != config_orig)
610 status = i2c_smbus_write_byte_data(client,
611 TMP401_CONFIG_WRITE,
612 config);
613
614 return status;
615}
616
617static int tmp401_detect(struct i2c_client *client,
618 struct i2c_board_info *info)
619{
620 enum chips kind;
621 struct i2c_adapter *adapter = client->adapter;
622 u8 reg;
623
624 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
625 return -ENODEV;
626
627 /* Detect and identify the chip */
628 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
629 if (reg != TMP401_MANUFACTURER_ID)
630 return -ENODEV;
631
632 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
633
634 switch (reg) {
635 case TMP401_DEVICE_ID:
636 if (client->addr != 0x4c)
637 return -ENODEV;
638 kind = tmp401;
639 break;
640 case TMP411A_DEVICE_ID:
641 if (client->addr != 0x4c)
642 return -ENODEV;
643 kind = tmp411;
644 break;
645 case TMP411B_DEVICE_ID:
646 if (client->addr != 0x4d)
647 return -ENODEV;
648 kind = tmp411;
649 break;
650 case TMP411C_DEVICE_ID:
651 if (client->addr != 0x4e)
652 return -ENODEV;
653 kind = tmp411;
654 break;
655 case TMP431_DEVICE_ID:
656 if (client->addr != 0x4c && client->addr != 0x4d)
657 return -ENODEV;
658 kind = tmp431;
659 break;
660 case TMP432_DEVICE_ID:
661 if (client->addr != 0x4c && client->addr != 0x4d)
662 return -ENODEV;
663 kind = tmp432;
664 break;
665 case TMP435_DEVICE_ID:
666 kind = tmp435;
667 break;
668 default:
669 return -ENODEV;
670 }
671
672 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
673 if (reg & 0x1b)
674 return -ENODEV;
675
676 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
677 /* Datasheet says: 0x1-0x6 */
678 if (reg > 15)
679 return -ENODEV;
680
681 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
682
683 return 0;
684}
685
686static int tmp401_probe(struct i2c_client *client,
687 const struct i2c_device_id *id)
688{
689 static const char * const names[] = {
690 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
691 };
692 struct device *dev = &client->dev;
693 struct device *hwmon_dev;
694 struct tmp401_data *data;
695 int groups = 0, status;
696
697 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
698 if (!data)
699 return -ENOMEM;
700
701 data->client = client;
702 mutex_init(&data->update_lock);
703 data->kind = id->driver_data;
704
705 /* Initialize the TMP401 chip */
706 status = tmp401_init_client(data, client);
707 if (status < 0)
708 return status;
709
710 /* Register sysfs hooks */
711 data->groups[groups++] = &tmp401_group;
712
713 /* Register additional tmp411 sysfs hooks */
714 if (data->kind == tmp411)
715 data->groups[groups++] = &tmp411_group;
716
717 /* Register additional tmp432 sysfs hooks */
718 if (data->kind == tmp432)
719 data->groups[groups++] = &tmp432_group;
720
721 if (data->kind == tmp461)
722 data->groups[groups++] = &tmp461_group;
723
724 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
725 data, data->groups);
726 if (IS_ERR(hwmon_dev))
727 return PTR_ERR(hwmon_dev);
728
729 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
730
731 return 0;
732}
733
734static struct i2c_driver tmp401_driver = {
735 .class = I2C_CLASS_HWMON,
736 .driver = {
737 .name = "tmp401",
738 },
739 .probe = tmp401_probe,
740 .id_table = tmp401_id,
741 .detect = tmp401_detect,
742 .address_list = normal_i2c,
743};
744
745module_i2c_driver(tmp401_driver);
746
747MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
748MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
749MODULE_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 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23/*
24 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.
25 *
26 * Note this IC is in some aspect similar to the LM90, but it has quite a
27 * few differences too, for example the local temp has a higher resolution
28 * and thus has 16 bits registers for its value and limit instead of 8 bits.
29 */
30
31#include <linux/module.h>
32#include <linux/init.h>
33#include <linux/slab.h>
34#include <linux/jiffies.h>
35#include <linux/i2c.h>
36#include <linux/hwmon.h>
37#include <linux/hwmon-sysfs.h>
38#include <linux/err.h>
39#include <linux/mutex.h>
40#include <linux/sysfs.h>
41
42/* Addresses to scan */
43static const unsigned short normal_i2c[] = { 0x4c, I2C_CLIENT_END };
44
45enum chips { tmp401, tmp411 };
46
47/*
48 * The TMP401 registers, note some registers have different addresses for
49 * reading and writing
50 */
51#define TMP401_STATUS 0x02
52#define TMP401_CONFIG_READ 0x03
53#define TMP401_CONFIG_WRITE 0x09
54#define TMP401_CONVERSION_RATE_READ 0x04
55#define TMP401_CONVERSION_RATE_WRITE 0x0A
56#define TMP401_TEMP_CRIT_HYST 0x21
57#define TMP401_CONSECUTIVE_ALERT 0x22
58#define TMP401_MANUFACTURER_ID_REG 0xFE
59#define TMP401_DEVICE_ID_REG 0xFF
60#define TMP411_N_FACTOR_REG 0x18
61
62static const u8 TMP401_TEMP_MSB[2] = { 0x00, 0x01 };
63static const u8 TMP401_TEMP_LSB[2] = { 0x15, 0x10 };
64static const u8 TMP401_TEMP_LOW_LIMIT_MSB_READ[2] = { 0x06, 0x08 };
65static const u8 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[2] = { 0x0C, 0x0E };
66static const u8 TMP401_TEMP_LOW_LIMIT_LSB[2] = { 0x17, 0x14 };
67static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_READ[2] = { 0x05, 0x07 };
68static const u8 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[2] = { 0x0B, 0x0D };
69static const u8 TMP401_TEMP_HIGH_LIMIT_LSB[2] = { 0x16, 0x13 };
70/* These are called the THERM limit / hysteresis / mask in the datasheet */
71static const u8 TMP401_TEMP_CRIT_LIMIT[2] = { 0x20, 0x19 };
72
73static const u8 TMP411_TEMP_LOWEST_MSB[2] = { 0x30, 0x34 };
74static const u8 TMP411_TEMP_LOWEST_LSB[2] = { 0x31, 0x35 };
75static const u8 TMP411_TEMP_HIGHEST_MSB[2] = { 0x32, 0x36 };
76static const u8 TMP411_TEMP_HIGHEST_LSB[2] = { 0x33, 0x37 };
77
78/* Flags */
79#define TMP401_CONFIG_RANGE 0x04
80#define TMP401_CONFIG_SHUTDOWN 0x40
81#define TMP401_STATUS_LOCAL_CRIT 0x01
82#define TMP401_STATUS_REMOTE_CRIT 0x02
83#define TMP401_STATUS_REMOTE_OPEN 0x04
84#define TMP401_STATUS_REMOTE_LOW 0x08
85#define TMP401_STATUS_REMOTE_HIGH 0x10
86#define TMP401_STATUS_LOCAL_LOW 0x20
87#define TMP401_STATUS_LOCAL_HIGH 0x40
88
89/* Manufacturer / Device ID's */
90#define TMP401_MANUFACTURER_ID 0x55
91#define TMP401_DEVICE_ID 0x11
92#define TMP411_DEVICE_ID 0x12
93
94/*
95 * Driver data (common to all clients)
96 */
97
98static const struct i2c_device_id tmp401_id[] = {
99 { "tmp401", tmp401 },
100 { "tmp411", tmp411 },
101 { }
102};
103MODULE_DEVICE_TABLE(i2c, tmp401_id);
104
105/*
106 * Client data (each client gets its own)
107 */
108
109struct tmp401_data {
110 struct device *hwmon_dev;
111 struct mutex update_lock;
112 char valid; /* zero until following fields are valid */
113 unsigned long last_updated; /* in jiffies */
114 enum chips kind;
115
116 /* register values */
117 u8 status;
118 u8 config;
119 u16 temp[2];
120 u16 temp_low[2];
121 u16 temp_high[2];
122 u8 temp_crit[2];
123 u8 temp_crit_hyst;
124 u16 temp_lowest[2];
125 u16 temp_highest[2];
126};
127
128/*
129 * Sysfs attr show / store functions
130 */
131
132static int tmp401_register_to_temp(u16 reg, u8 config)
133{
134 int temp = reg;
135
136 if (config & TMP401_CONFIG_RANGE)
137 temp -= 64 * 256;
138
139 return (temp * 625 + 80) / 160;
140}
141
142static u16 tmp401_temp_to_register(long temp, u8 config)
143{
144 if (config & TMP401_CONFIG_RANGE) {
145 temp = SENSORS_LIMIT(temp, -64000, 191000);
146 temp += 64000;
147 } else
148 temp = SENSORS_LIMIT(temp, 0, 127000);
149
150 return (temp * 160 + 312) / 625;
151}
152
153static int tmp401_crit_register_to_temp(u8 reg, u8 config)
154{
155 int temp = reg;
156
157 if (config & TMP401_CONFIG_RANGE)
158 temp -= 64;
159
160 return temp * 1000;
161}
162
163static u8 tmp401_crit_temp_to_register(long temp, u8 config)
164{
165 if (config & TMP401_CONFIG_RANGE) {
166 temp = SENSORS_LIMIT(temp, -64000, 191000);
167 temp += 64000;
168 } else
169 temp = SENSORS_LIMIT(temp, 0, 127000);
170
171 return (temp + 500) / 1000;
172}
173
174static struct tmp401_data *tmp401_update_device_reg16(
175 struct i2c_client *client, struct tmp401_data *data)
176{
177 int i;
178
179 for (i = 0; i < 2; i++) {
180 /*
181 * High byte must be read first immediately followed
182 * by the low byte
183 */
184 data->temp[i] = i2c_smbus_read_byte_data(client,
185 TMP401_TEMP_MSB[i]) << 8;
186 data->temp[i] |= i2c_smbus_read_byte_data(client,
187 TMP401_TEMP_LSB[i]);
188 data->temp_low[i] = i2c_smbus_read_byte_data(client,
189 TMP401_TEMP_LOW_LIMIT_MSB_READ[i]) << 8;
190 data->temp_low[i] |= i2c_smbus_read_byte_data(client,
191 TMP401_TEMP_LOW_LIMIT_LSB[i]);
192 data->temp_high[i] = i2c_smbus_read_byte_data(client,
193 TMP401_TEMP_HIGH_LIMIT_MSB_READ[i]) << 8;
194 data->temp_high[i] |= i2c_smbus_read_byte_data(client,
195 TMP401_TEMP_HIGH_LIMIT_LSB[i]);
196 data->temp_crit[i] = i2c_smbus_read_byte_data(client,
197 TMP401_TEMP_CRIT_LIMIT[i]);
198
199 if (data->kind == tmp411) {
200 data->temp_lowest[i] = i2c_smbus_read_byte_data(client,
201 TMP411_TEMP_LOWEST_MSB[i]) << 8;
202 data->temp_lowest[i] |= i2c_smbus_read_byte_data(
203 client, TMP411_TEMP_LOWEST_LSB[i]);
204
205 data->temp_highest[i] = i2c_smbus_read_byte_data(
206 client, TMP411_TEMP_HIGHEST_MSB[i]) << 8;
207 data->temp_highest[i] |= i2c_smbus_read_byte_data(
208 client, TMP411_TEMP_HIGHEST_LSB[i]);
209 }
210 }
211 return data;
212}
213
214static struct tmp401_data *tmp401_update_device(struct device *dev)
215{
216 struct i2c_client *client = to_i2c_client(dev);
217 struct tmp401_data *data = i2c_get_clientdata(client);
218
219 mutex_lock(&data->update_lock);
220
221 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
222 data->status = i2c_smbus_read_byte_data(client, TMP401_STATUS);
223 data->config = i2c_smbus_read_byte_data(client,
224 TMP401_CONFIG_READ);
225 tmp401_update_device_reg16(client, data);
226
227 data->temp_crit_hyst = i2c_smbus_read_byte_data(client,
228 TMP401_TEMP_CRIT_HYST);
229
230 data->last_updated = jiffies;
231 data->valid = 1;
232 }
233
234 mutex_unlock(&data->update_lock);
235
236 return data;
237}
238
239static ssize_t show_temp_value(struct device *dev,
240 struct device_attribute *devattr, char *buf)
241{
242 int index = to_sensor_dev_attr(devattr)->index;
243 struct tmp401_data *data = tmp401_update_device(dev);
244
245 return sprintf(buf, "%d\n",
246 tmp401_register_to_temp(data->temp[index], data->config));
247}
248
249static ssize_t show_temp_min(struct device *dev,
250 struct device_attribute *devattr, char *buf)
251{
252 int index = to_sensor_dev_attr(devattr)->index;
253 struct tmp401_data *data = tmp401_update_device(dev);
254
255 return sprintf(buf, "%d\n",
256 tmp401_register_to_temp(data->temp_low[index], data->config));
257}
258
259static ssize_t show_temp_max(struct device *dev,
260 struct device_attribute *devattr, char *buf)
261{
262 int index = to_sensor_dev_attr(devattr)->index;
263 struct tmp401_data *data = tmp401_update_device(dev);
264
265 return sprintf(buf, "%d\n",
266 tmp401_register_to_temp(data->temp_high[index], data->config));
267}
268
269static ssize_t show_temp_crit(struct device *dev,
270 struct device_attribute *devattr, char *buf)
271{
272 int index = to_sensor_dev_attr(devattr)->index;
273 struct tmp401_data *data = tmp401_update_device(dev);
274
275 return sprintf(buf, "%d\n",
276 tmp401_crit_register_to_temp(data->temp_crit[index],
277 data->config));
278}
279
280static ssize_t show_temp_crit_hyst(struct device *dev,
281 struct device_attribute *devattr, char *buf)
282{
283 int temp, index = to_sensor_dev_attr(devattr)->index;
284 struct tmp401_data *data = tmp401_update_device(dev);
285
286 mutex_lock(&data->update_lock);
287 temp = tmp401_crit_register_to_temp(data->temp_crit[index],
288 data->config);
289 temp -= data->temp_crit_hyst * 1000;
290 mutex_unlock(&data->update_lock);
291
292 return sprintf(buf, "%d\n", temp);
293}
294
295static ssize_t show_temp_lowest(struct device *dev,
296 struct device_attribute *devattr, char *buf)
297{
298 int index = to_sensor_dev_attr(devattr)->index;
299 struct tmp401_data *data = tmp401_update_device(dev);
300
301 return sprintf(buf, "%d\n",
302 tmp401_register_to_temp(data->temp_lowest[index],
303 data->config));
304}
305
306static ssize_t show_temp_highest(struct device *dev,
307 struct device_attribute *devattr, char *buf)
308{
309 int index = to_sensor_dev_attr(devattr)->index;
310 struct tmp401_data *data = tmp401_update_device(dev);
311
312 return sprintf(buf, "%d\n",
313 tmp401_register_to_temp(data->temp_highest[index],
314 data->config));
315}
316
317static ssize_t show_status(struct device *dev,
318 struct device_attribute *devattr, char *buf)
319{
320 int mask = to_sensor_dev_attr(devattr)->index;
321 struct tmp401_data *data = tmp401_update_device(dev);
322
323 if (data->status & mask)
324 return sprintf(buf, "1\n");
325 else
326 return sprintf(buf, "0\n");
327}
328
329static ssize_t store_temp_min(struct device *dev, struct device_attribute
330 *devattr, const char *buf, size_t count)
331{
332 int index = to_sensor_dev_attr(devattr)->index;
333 struct tmp401_data *data = tmp401_update_device(dev);
334 long val;
335 u16 reg;
336
337 if (strict_strtol(buf, 10, &val))
338 return -EINVAL;
339
340 reg = tmp401_temp_to_register(val, data->config);
341
342 mutex_lock(&data->update_lock);
343
344 i2c_smbus_write_byte_data(to_i2c_client(dev),
345 TMP401_TEMP_LOW_LIMIT_MSB_WRITE[index], reg >> 8);
346 i2c_smbus_write_byte_data(to_i2c_client(dev),
347 TMP401_TEMP_LOW_LIMIT_LSB[index], reg & 0xFF);
348
349 data->temp_low[index] = reg;
350
351 mutex_unlock(&data->update_lock);
352
353 return count;
354}
355
356static ssize_t store_temp_max(struct device *dev, struct device_attribute
357 *devattr, const char *buf, size_t count)
358{
359 int index = to_sensor_dev_attr(devattr)->index;
360 struct tmp401_data *data = tmp401_update_device(dev);
361 long val;
362 u16 reg;
363
364 if (strict_strtol(buf, 10, &val))
365 return -EINVAL;
366
367 reg = tmp401_temp_to_register(val, data->config);
368
369 mutex_lock(&data->update_lock);
370
371 i2c_smbus_write_byte_data(to_i2c_client(dev),
372 TMP401_TEMP_HIGH_LIMIT_MSB_WRITE[index], reg >> 8);
373 i2c_smbus_write_byte_data(to_i2c_client(dev),
374 TMP401_TEMP_HIGH_LIMIT_LSB[index], reg & 0xFF);
375
376 data->temp_high[index] = reg;
377
378 mutex_unlock(&data->update_lock);
379
380 return count;
381}
382
383static ssize_t store_temp_crit(struct device *dev, struct device_attribute
384 *devattr, const char *buf, size_t count)
385{
386 int index = to_sensor_dev_attr(devattr)->index;
387 struct tmp401_data *data = tmp401_update_device(dev);
388 long val;
389 u8 reg;
390
391 if (strict_strtol(buf, 10, &val))
392 return -EINVAL;
393
394 reg = tmp401_crit_temp_to_register(val, data->config);
395
396 mutex_lock(&data->update_lock);
397
398 i2c_smbus_write_byte_data(to_i2c_client(dev),
399 TMP401_TEMP_CRIT_LIMIT[index], reg);
400
401 data->temp_crit[index] = reg;
402
403 mutex_unlock(&data->update_lock);
404
405 return count;
406}
407
408static ssize_t store_temp_crit_hyst(struct device *dev, struct device_attribute
409 *devattr, const char *buf, size_t count)
410{
411 int temp, index = to_sensor_dev_attr(devattr)->index;
412 struct tmp401_data *data = tmp401_update_device(dev);
413 long val;
414 u8 reg;
415
416 if (strict_strtol(buf, 10, &val))
417 return -EINVAL;
418
419 if (data->config & TMP401_CONFIG_RANGE)
420 val = SENSORS_LIMIT(val, -64000, 191000);
421 else
422 val = SENSORS_LIMIT(val, 0, 127000);
423
424 mutex_lock(&data->update_lock);
425 temp = tmp401_crit_register_to_temp(data->temp_crit[index],
426 data->config);
427 val = SENSORS_LIMIT(val, temp - 255000, temp);
428 reg = ((temp - val) + 500) / 1000;
429
430 i2c_smbus_write_byte_data(to_i2c_client(dev),
431 TMP401_TEMP_CRIT_HYST, reg);
432
433 data->temp_crit_hyst = reg;
434
435 mutex_unlock(&data->update_lock);
436
437 return count;
438}
439
440/*
441 * Resets the historical measurements of minimum and maximum temperatures.
442 * This is done by writing any value to any of the minimum/maximum registers
443 * (0x30-0x37).
444 */
445static ssize_t reset_temp_history(struct device *dev,
446 struct device_attribute *devattr, const char *buf, size_t count)
447{
448 long val;
449
450 if (strict_strtol(buf, 10, &val))
451 return -EINVAL;
452
453 if (val != 1) {
454 dev_err(dev, "temp_reset_history value %ld not"
455 " supported. Use 1 to reset the history!\n", val);
456 return -EINVAL;
457 }
458 i2c_smbus_write_byte_data(to_i2c_client(dev),
459 TMP411_TEMP_LOWEST_MSB[0], val);
460
461 return count;
462}
463
464static struct sensor_device_attribute tmp401_attr[] = {
465 SENSOR_ATTR(temp1_input, S_IRUGO, show_temp_value, NULL, 0),
466 SENSOR_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp_min,
467 store_temp_min, 0),
468 SENSOR_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
469 store_temp_max, 0),
470 SENSOR_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit,
471 store_temp_crit, 0),
472 SENSOR_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_temp_crit_hyst,
473 store_temp_crit_hyst, 0),
474 SENSOR_ATTR(temp1_min_alarm, S_IRUGO, show_status, NULL,
475 TMP401_STATUS_LOCAL_LOW),
476 SENSOR_ATTR(temp1_max_alarm, S_IRUGO, show_status, NULL,
477 TMP401_STATUS_LOCAL_HIGH),
478 SENSOR_ATTR(temp1_crit_alarm, S_IRUGO, show_status, NULL,
479 TMP401_STATUS_LOCAL_CRIT),
480 SENSOR_ATTR(temp2_input, S_IRUGO, show_temp_value, NULL, 1),
481 SENSOR_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_temp_min,
482 store_temp_min, 1),
483 SENSOR_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
484 store_temp_max, 1),
485 SENSOR_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit,
486 store_temp_crit, 1),
487 SENSOR_ATTR(temp2_crit_hyst, S_IRUGO, show_temp_crit_hyst, NULL, 1),
488 SENSOR_ATTR(temp2_fault, S_IRUGO, show_status, NULL,
489 TMP401_STATUS_REMOTE_OPEN),
490 SENSOR_ATTR(temp2_min_alarm, S_IRUGO, show_status, NULL,
491 TMP401_STATUS_REMOTE_LOW),
492 SENSOR_ATTR(temp2_max_alarm, S_IRUGO, show_status, NULL,
493 TMP401_STATUS_REMOTE_HIGH),
494 SENSOR_ATTR(temp2_crit_alarm, S_IRUGO, show_status, NULL,
495 TMP401_STATUS_REMOTE_CRIT),
496};
497
498/*
499 * Additional features of the TMP411 chip.
500 * The TMP411 stores the minimum and maximum
501 * temperature measured since power-on, chip-reset, or
502 * minimum and maximum register reset for both the local
503 * and remote channels.
504 */
505static struct sensor_device_attribute tmp411_attr[] = {
506 SENSOR_ATTR(temp1_highest, S_IRUGO, show_temp_highest, NULL, 0),
507 SENSOR_ATTR(temp1_lowest, S_IRUGO, show_temp_lowest, NULL, 0),
508 SENSOR_ATTR(temp2_highest, S_IRUGO, show_temp_highest, NULL, 1),
509 SENSOR_ATTR(temp2_lowest, S_IRUGO, show_temp_lowest, NULL, 1),
510 SENSOR_ATTR(temp_reset_history, S_IWUSR, NULL, reset_temp_history, 0),
511};
512
513/*
514 * Begin non sysfs callback code (aka Real code)
515 */
516
517static void tmp401_init_client(struct i2c_client *client)
518{
519 int config, config_orig;
520
521 /* Set the conversion rate to 2 Hz */
522 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
523
524 /* Start conversions (disable shutdown if necessary) */
525 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
526 if (config < 0) {
527 dev_warn(&client->dev, "Initialization failed!\n");
528 return;
529 }
530
531 config_orig = config;
532 config &= ~TMP401_CONFIG_SHUTDOWN;
533
534 if (config != config_orig)
535 i2c_smbus_write_byte_data(client, TMP401_CONFIG_WRITE, config);
536}
537
538static int tmp401_detect(struct i2c_client *client,
539 struct i2c_board_info *info)
540{
541 enum chips kind;
542 struct i2c_adapter *adapter = client->adapter;
543 u8 reg;
544
545 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
546 return -ENODEV;
547
548 /* Detect and identify the chip */
549 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
550 if (reg != TMP401_MANUFACTURER_ID)
551 return -ENODEV;
552
553 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
554
555 switch (reg) {
556 case TMP401_DEVICE_ID:
557 kind = tmp401;
558 break;
559 case TMP411_DEVICE_ID:
560 kind = tmp411;
561 break;
562 default:
563 return -ENODEV;
564 }
565
566 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
567 if (reg & 0x1b)
568 return -ENODEV;
569
570 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
571 /* Datasheet says: 0x1-0x6 */
572 if (reg > 15)
573 return -ENODEV;
574
575 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
576
577 return 0;
578}
579
580static int tmp401_remove(struct i2c_client *client)
581{
582 struct tmp401_data *data = i2c_get_clientdata(client);
583 int i;
584
585 if (data->hwmon_dev)
586 hwmon_device_unregister(data->hwmon_dev);
587
588 for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++)
589 device_remove_file(&client->dev, &tmp401_attr[i].dev_attr);
590
591 if (data->kind == tmp411) {
592 for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++)
593 device_remove_file(&client->dev,
594 &tmp411_attr[i].dev_attr);
595 }
596
597 kfree(data);
598 return 0;
599}
600
601static int tmp401_probe(struct i2c_client *client,
602 const struct i2c_device_id *id)
603{
604 int i, err = 0;
605 struct tmp401_data *data;
606 const char *names[] = { "TMP401", "TMP411" };
607
608 data = kzalloc(sizeof(struct tmp401_data), GFP_KERNEL);
609 if (!data)
610 return -ENOMEM;
611
612 i2c_set_clientdata(client, data);
613 mutex_init(&data->update_lock);
614 data->kind = id->driver_data;
615
616 /* Initialize the TMP401 chip */
617 tmp401_init_client(client);
618
619 /* Register sysfs hooks */
620 for (i = 0; i < ARRAY_SIZE(tmp401_attr); i++) {
621 err = device_create_file(&client->dev,
622 &tmp401_attr[i].dev_attr);
623 if (err)
624 goto exit_remove;
625 }
626
627 /* Register aditional tmp411 sysfs hooks */
628 if (data->kind == tmp411) {
629 for (i = 0; i < ARRAY_SIZE(tmp411_attr); i++) {
630 err = device_create_file(&client->dev,
631 &tmp411_attr[i].dev_attr);
632 if (err)
633 goto exit_remove;
634 }
635 }
636
637 data->hwmon_dev = hwmon_device_register(&client->dev);
638 if (IS_ERR(data->hwmon_dev)) {
639 err = PTR_ERR(data->hwmon_dev);
640 data->hwmon_dev = NULL;
641 goto exit_remove;
642 }
643
644 dev_info(&client->dev, "Detected TI %s chip\n", names[data->kind]);
645
646 return 0;
647
648exit_remove:
649 tmp401_remove(client); /* will also free data for us */
650 return err;
651}
652
653static struct i2c_driver tmp401_driver = {
654 .class = I2C_CLASS_HWMON,
655 .driver = {
656 .name = "tmp401",
657 },
658 .probe = tmp401_probe,
659 .remove = tmp401_remove,
660 .id_table = tmp401_id,
661 .detect = tmp401_detect,
662 .address_list = normal_i2c,
663};
664
665static int __init tmp401_init(void)
666{
667 return i2c_add_driver(&tmp401_driver);
668}
669
670static void __exit tmp401_exit(void)
671{
672 i2c_del_driver(&tmp401_driver);
673}
674
675MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
676MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
677MODULE_LICENSE("GPL");
678
679module_init(tmp401_init);
680module_exit(tmp401_exit);