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 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
92static 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 */
100static 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
133static 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};
142MODULE_DEVICE_TABLE(i2c, tmp401_id);
143
144/*
145 * Client data (each client gets its own)
146 */
147
148struct 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
169static 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
179static 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
190static 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
219static 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
286abort:
287 mutex_unlock(&data->update_lock);
288 return ret;
289}
290
291static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
292 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
305static ssize_t temp_crit_hyst_show(struct device *dev,
306 struct device_attribute *devattr,
307 char *buf)
308{
309 int temp, index = to_sensor_dev_attr(devattr)->index;
310 struct tmp401_data *data = tmp401_update_device(dev);
311
312 if (IS_ERR(data))
313 return PTR_ERR(data);
314
315 mutex_lock(&data->update_lock);
316 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
317 temp -= data->temp_crit_hyst * 1000;
318 mutex_unlock(&data->update_lock);
319
320 return sprintf(buf, "%d\n", temp);
321}
322
323static ssize_t status_show(struct device *dev,
324 struct device_attribute *devattr, char *buf)
325{
326 int nr = to_sensor_dev_attr_2(devattr)->nr;
327 int mask = to_sensor_dev_attr_2(devattr)->index;
328 struct tmp401_data *data = tmp401_update_device(dev);
329
330 if (IS_ERR(data))
331 return PTR_ERR(data);
332
333 return sprintf(buf, "%d\n", !!(data->status[nr] & mask));
334}
335
336static ssize_t temp_store(struct device *dev,
337 struct device_attribute *devattr, const char *buf,
338 size_t count)
339{
340 int nr = to_sensor_dev_attr_2(devattr)->nr;
341 int index = to_sensor_dev_attr_2(devattr)->index;
342 struct tmp401_data *data = dev_get_drvdata(dev);
343 struct i2c_client *client = data->client;
344 long val;
345 u16 reg;
346 u8 regaddr;
347
348 if (kstrtol(buf, 10, &val))
349 return -EINVAL;
350
351 reg = tmp401_temp_to_register(val, data->config, nr == 3 ? 8 : 4);
352
353 mutex_lock(&data->update_lock);
354
355 regaddr = data->kind == tmp432 ? TMP432_TEMP_MSB_WRITE[nr][index]
356 : TMP401_TEMP_MSB_WRITE[nr][index];
357 if (nr == 3) { /* crit is msb only */
358 i2c_smbus_write_byte_data(client, regaddr, reg >> 8);
359 } else {
360 /* Hardware expects big endian data --> use _swapped */
361 i2c_smbus_write_word_swapped(client, regaddr, reg);
362 }
363 data->temp[nr][index] = reg;
364
365 mutex_unlock(&data->update_lock);
366
367 return count;
368}
369
370static ssize_t temp_crit_hyst_store(struct device *dev,
371 struct device_attribute *devattr,
372 const char *buf, size_t count)
373{
374 int temp, index = to_sensor_dev_attr(devattr)->index;
375 struct tmp401_data *data = tmp401_update_device(dev);
376 long val;
377 u8 reg;
378
379 if (IS_ERR(data))
380 return PTR_ERR(data);
381
382 if (kstrtol(buf, 10, &val))
383 return -EINVAL;
384
385 if (data->config & TMP401_CONFIG_RANGE)
386 val = clamp_val(val, -64000, 191000);
387 else
388 val = clamp_val(val, 0, 127000);
389
390 mutex_lock(&data->update_lock);
391 temp = tmp401_register_to_temp(data->temp[3][index], data->config);
392 val = clamp_val(val, temp - 255000, temp);
393 reg = ((temp - val) + 500) / 1000;
394
395 i2c_smbus_write_byte_data(data->client, TMP401_TEMP_CRIT_HYST,
396 reg);
397
398 data->temp_crit_hyst = reg;
399
400 mutex_unlock(&data->update_lock);
401
402 return count;
403}
404
405/*
406 * Resets the historical measurements of minimum and maximum temperatures.
407 * This is done by writing any value to any of the minimum/maximum registers
408 * (0x30-0x37).
409 */
410static ssize_t reset_temp_history_store(struct device *dev,
411 struct device_attribute *devattr,
412 const char *buf, size_t count)
413{
414 struct tmp401_data *data = dev_get_drvdata(dev);
415 struct i2c_client *client = data->client;
416 long val;
417
418 if (kstrtol(buf, 10, &val))
419 return -EINVAL;
420
421 if (val != 1) {
422 dev_err(dev,
423 "temp_reset_history value %ld not supported. Use 1 to reset the history!\n",
424 val);
425 return -EINVAL;
426 }
427 mutex_lock(&data->update_lock);
428 i2c_smbus_write_byte_data(client, TMP401_TEMP_MSB_WRITE[5][0], val);
429 data->valid = 0;
430 mutex_unlock(&data->update_lock);
431
432 return count;
433}
434
435static ssize_t update_interval_show(struct device *dev,
436 struct device_attribute *attr, char *buf)
437{
438 struct tmp401_data *data = dev_get_drvdata(dev);
439
440 return sprintf(buf, "%u\n", data->update_interval);
441}
442
443static ssize_t update_interval_store(struct device *dev,
444 struct device_attribute *attr,
445 const char *buf, size_t count)
446{
447 struct tmp401_data *data = dev_get_drvdata(dev);
448 struct i2c_client *client = data->client;
449 unsigned long val;
450 int err, rate;
451
452 err = kstrtoul(buf, 10, &val);
453 if (err)
454 return err;
455
456 /*
457 * For valid rates, interval can be calculated as
458 * interval = (1 << (7 - rate)) * 125;
459 * Rounded rate is therefore
460 * rate = 7 - __fls(interval * 4 / (125 * 3));
461 * Use clamp_val() to avoid overflows, and to ensure valid input
462 * for __fls.
463 */
464 val = clamp_val(val, 125, 16000);
465 rate = 7 - __fls(val * 4 / (125 * 3));
466 mutex_lock(&data->update_lock);
467 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, rate);
468 data->update_interval = (1 << (7 - rate)) * 125;
469 mutex_unlock(&data->update_lock);
470
471 return count;
472}
473
474static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, 0);
475static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 1, 0);
476static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 2, 0);
477static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 3, 0);
478static SENSOR_DEVICE_ATTR_RW(temp1_crit_hyst, temp_crit_hyst, 0);
479static SENSOR_DEVICE_ATTR_2_RO(temp1_min_alarm, status, 1,
480 TMP432_STATUS_LOCAL);
481static SENSOR_DEVICE_ATTR_2_RO(temp1_max_alarm, status, 2,
482 TMP432_STATUS_LOCAL);
483static SENSOR_DEVICE_ATTR_2_RO(temp1_crit_alarm, status, 3,
484 TMP432_STATUS_LOCAL);
485static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 0, 1);
486static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, 1);
487static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 2, 1);
488static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 3, 1);
489static SENSOR_DEVICE_ATTR_RO(temp2_crit_hyst, temp_crit_hyst, 1);
490static SENSOR_DEVICE_ATTR_2_RO(temp2_fault, status, 0, TMP432_STATUS_REMOTE1);
491static SENSOR_DEVICE_ATTR_2_RO(temp2_min_alarm, status, 1,
492 TMP432_STATUS_REMOTE1);
493static SENSOR_DEVICE_ATTR_2_RO(temp2_max_alarm, status, 2,
494 TMP432_STATUS_REMOTE1);
495static SENSOR_DEVICE_ATTR_2_RO(temp2_crit_alarm, status, 3,
496 TMP432_STATUS_REMOTE1);
497
498static DEVICE_ATTR_RW(update_interval);
499
500static struct attribute *tmp401_attributes[] = {
501 &sensor_dev_attr_temp1_input.dev_attr.attr,
502 &sensor_dev_attr_temp1_min.dev_attr.attr,
503 &sensor_dev_attr_temp1_max.dev_attr.attr,
504 &sensor_dev_attr_temp1_crit.dev_attr.attr,
505 &sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
506 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
507 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
508 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
509
510 &sensor_dev_attr_temp2_input.dev_attr.attr,
511 &sensor_dev_attr_temp2_min.dev_attr.attr,
512 &sensor_dev_attr_temp2_max.dev_attr.attr,
513 &sensor_dev_attr_temp2_crit.dev_attr.attr,
514 &sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
515 &sensor_dev_attr_temp2_fault.dev_attr.attr,
516 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
517 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
518 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
519
520 &dev_attr_update_interval.attr,
521
522 NULL
523};
524
525static const struct attribute_group tmp401_group = {
526 .attrs = tmp401_attributes,
527};
528
529/*
530 * Additional features of the TMP411 chip.
531 * The TMP411 stores the minimum and maximum
532 * temperature measured since power-on, chip-reset, or
533 * minimum and maximum register reset for both the local
534 * and remote channels.
535 */
536static SENSOR_DEVICE_ATTR_2_RO(temp1_lowest, temp, 4, 0);
537static SENSOR_DEVICE_ATTR_2_RO(temp1_highest, temp, 5, 0);
538static SENSOR_DEVICE_ATTR_2_RO(temp2_lowest, temp, 4, 1);
539static SENSOR_DEVICE_ATTR_2_RO(temp2_highest, temp, 5, 1);
540static SENSOR_DEVICE_ATTR_WO(temp_reset_history, reset_temp_history, 0);
541
542static struct attribute *tmp411_attributes[] = {
543 &sensor_dev_attr_temp1_highest.dev_attr.attr,
544 &sensor_dev_attr_temp1_lowest.dev_attr.attr,
545 &sensor_dev_attr_temp2_highest.dev_attr.attr,
546 &sensor_dev_attr_temp2_lowest.dev_attr.attr,
547 &sensor_dev_attr_temp_reset_history.dev_attr.attr,
548 NULL
549};
550
551static const struct attribute_group tmp411_group = {
552 .attrs = tmp411_attributes,
553};
554
555static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 0, 2);
556static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 1, 2);
557static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, 2);
558static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 3, 2);
559static SENSOR_DEVICE_ATTR_RO(temp3_crit_hyst, temp_crit_hyst, 2);
560static SENSOR_DEVICE_ATTR_2_RO(temp3_fault, status, 0, TMP432_STATUS_REMOTE2);
561static SENSOR_DEVICE_ATTR_2_RO(temp3_min_alarm, status, 1,
562 TMP432_STATUS_REMOTE2);
563static SENSOR_DEVICE_ATTR_2_RO(temp3_max_alarm, status, 2,
564 TMP432_STATUS_REMOTE2);
565static SENSOR_DEVICE_ATTR_2_RO(temp3_crit_alarm, status, 3,
566 TMP432_STATUS_REMOTE2);
567
568static struct attribute *tmp432_attributes[] = {
569 &sensor_dev_attr_temp3_input.dev_attr.attr,
570 &sensor_dev_attr_temp3_min.dev_attr.attr,
571 &sensor_dev_attr_temp3_max.dev_attr.attr,
572 &sensor_dev_attr_temp3_crit.dev_attr.attr,
573 &sensor_dev_attr_temp3_crit_hyst.dev_attr.attr,
574 &sensor_dev_attr_temp3_fault.dev_attr.attr,
575 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
576 &sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
577 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
578
579 NULL
580};
581
582static const struct attribute_group tmp432_group = {
583 .attrs = tmp432_attributes,
584};
585
586/*
587 * Additional features of the TMP461 chip.
588 * The TMP461 temperature offset for the remote channel.
589 */
590static SENSOR_DEVICE_ATTR_2_RW(temp2_offset, temp, 6, 1);
591
592static struct attribute *tmp461_attributes[] = {
593 &sensor_dev_attr_temp2_offset.dev_attr.attr,
594 NULL
595};
596
597static const struct attribute_group tmp461_group = {
598 .attrs = tmp461_attributes,
599};
600
601/*
602 * Begin non sysfs callback code (aka Real code)
603 */
604
605static int tmp401_init_client(struct tmp401_data *data,
606 struct i2c_client *client)
607{
608 int config, config_orig, status = 0;
609
610 /* Set the conversion rate to 2 Hz */
611 i2c_smbus_write_byte_data(client, TMP401_CONVERSION_RATE_WRITE, 5);
612 data->update_interval = 500;
613
614 /* Start conversions (disable shutdown if necessary) */
615 config = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
616 if (config < 0)
617 return config;
618
619 config_orig = config;
620 config &= ~TMP401_CONFIG_SHUTDOWN;
621
622 if (config != config_orig)
623 status = i2c_smbus_write_byte_data(client,
624 TMP401_CONFIG_WRITE,
625 config);
626
627 return status;
628}
629
630static int tmp401_detect(struct i2c_client *client,
631 struct i2c_board_info *info)
632{
633 enum chips kind;
634 struct i2c_adapter *adapter = client->adapter;
635 u8 reg;
636
637 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
638 return -ENODEV;
639
640 /* Detect and identify the chip */
641 reg = i2c_smbus_read_byte_data(client, TMP401_MANUFACTURER_ID_REG);
642 if (reg != TMP401_MANUFACTURER_ID)
643 return -ENODEV;
644
645 reg = i2c_smbus_read_byte_data(client, TMP401_DEVICE_ID_REG);
646
647 switch (reg) {
648 case TMP401_DEVICE_ID:
649 if (client->addr != 0x4c)
650 return -ENODEV;
651 kind = tmp401;
652 break;
653 case TMP411A_DEVICE_ID:
654 if (client->addr != 0x4c)
655 return -ENODEV;
656 kind = tmp411;
657 break;
658 case TMP411B_DEVICE_ID:
659 if (client->addr != 0x4d)
660 return -ENODEV;
661 kind = tmp411;
662 break;
663 case TMP411C_DEVICE_ID:
664 if (client->addr != 0x4e)
665 return -ENODEV;
666 kind = tmp411;
667 break;
668 case TMP431_DEVICE_ID:
669 if (client->addr != 0x4c && client->addr != 0x4d)
670 return -ENODEV;
671 kind = tmp431;
672 break;
673 case TMP432_DEVICE_ID:
674 if (client->addr != 0x4c && client->addr != 0x4d)
675 return -ENODEV;
676 kind = tmp432;
677 break;
678 case TMP435_DEVICE_ID:
679 kind = tmp435;
680 break;
681 default:
682 return -ENODEV;
683 }
684
685 reg = i2c_smbus_read_byte_data(client, TMP401_CONFIG_READ);
686 if (reg & 0x1b)
687 return -ENODEV;
688
689 reg = i2c_smbus_read_byte_data(client, TMP401_CONVERSION_RATE_READ);
690 /* Datasheet says: 0x1-0x6 */
691 if (reg > 15)
692 return -ENODEV;
693
694 strlcpy(info->type, tmp401_id[kind].name, I2C_NAME_SIZE);
695
696 return 0;
697}
698
699static int tmp401_probe(struct i2c_client *client,
700 const struct i2c_device_id *id)
701{
702 static const char * const names[] = {
703 "TMP401", "TMP411", "TMP431", "TMP432", "TMP435", "TMP461"
704 };
705 struct device *dev = &client->dev;
706 struct device *hwmon_dev;
707 struct tmp401_data *data;
708 int groups = 0, status;
709
710 data = devm_kzalloc(dev, sizeof(struct tmp401_data), GFP_KERNEL);
711 if (!data)
712 return -ENOMEM;
713
714 data->client = client;
715 mutex_init(&data->update_lock);
716 data->kind = id->driver_data;
717
718 /* Initialize the TMP401 chip */
719 status = tmp401_init_client(data, client);
720 if (status < 0)
721 return status;
722
723 /* Register sysfs hooks */
724 data->groups[groups++] = &tmp401_group;
725
726 /* Register additional tmp411 sysfs hooks */
727 if (data->kind == tmp411)
728 data->groups[groups++] = &tmp411_group;
729
730 /* Register additional tmp432 sysfs hooks */
731 if (data->kind == tmp432)
732 data->groups[groups++] = &tmp432_group;
733
734 if (data->kind == tmp461)
735 data->groups[groups++] = &tmp461_group;
736
737 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
738 data, data->groups);
739 if (IS_ERR(hwmon_dev))
740 return PTR_ERR(hwmon_dev);
741
742 dev_info(dev, "Detected TI %s chip\n", names[data->kind]);
743
744 return 0;
745}
746
747static struct i2c_driver tmp401_driver = {
748 .class = I2C_CLASS_HWMON,
749 .driver = {
750 .name = "tmp401",
751 },
752 .probe = tmp401_probe,
753 .id_table = tmp401_id,
754 .detect = tmp401_detect,
755 .address_list = normal_i2c,
756};
757
758module_i2c_driver(tmp401_driver);
759
760MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
761MODULE_DESCRIPTION("Texas Instruments TMP401 temperature sensor driver");
762MODULE_LICENSE("GPL");
763