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1/*
2 * max6639.c - Support for Maxim MAX6639
3 *
4 * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
5 *
6 * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
7 *
8 * based on the initial MAX6639 support from semptian.net
9 * by He Changqing <hechangqing@semptian.com>
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#include <linux/module.h>
27#include <linux/init.h>
28#include <linux/slab.h>
29#include <linux/jiffies.h>
30#include <linux/i2c.h>
31#include <linux/hwmon.h>
32#include <linux/hwmon-sysfs.h>
33#include <linux/err.h>
34#include <linux/mutex.h>
35#include <linux/i2c/max6639.h>
36
37/* Addresses to scan */
38static unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
39
40/* The MAX6639 registers, valid channel numbers: 0, 1 */
41#define MAX6639_REG_TEMP(ch) (0x00 + (ch))
42#define MAX6639_REG_STATUS 0x02
43#define MAX6639_REG_OUTPUT_MASK 0x03
44#define MAX6639_REG_GCONFIG 0x04
45#define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch))
46#define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch))
47#define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch))
48#define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch))
49#define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4)
50#define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4)
51#define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4)
52#define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4)
53#define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch))
54#define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch))
55#define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch))
56#define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch))
57#define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch))
58#define MAX6639_REG_DEVID 0x3D
59#define MAX6639_REG_MANUID 0x3E
60#define MAX6639_REG_DEVREV 0x3F
61
62/* Register bits */
63#define MAX6639_GCONFIG_STANDBY 0x80
64#define MAX6639_GCONFIG_POR 0x40
65#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20
66#define MAX6639_GCONFIG_CH2_LOCAL 0x10
67#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08
68
69#define MAX6639_FAN_CONFIG1_PWM 0x80
70
71#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40
72
73static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
74
75#define FAN_FROM_REG(val, div, rpm_range) ((val) == 0 ? -1 : \
76 (val) == 255 ? 0 : (rpm_ranges[rpm_range] * 30) / ((div + 1) * (val)))
77#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val) / 1000, 0, 255)
78
79/*
80 * Client data (each client gets its own)
81 */
82struct max6639_data {
83 struct device *hwmon_dev;
84 struct mutex update_lock;
85 char valid; /* !=0 if following fields are valid */
86 unsigned long last_updated; /* In jiffies */
87
88 /* Register values sampled regularly */
89 u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */
90 bool temp_fault[2]; /* Detected temperature diode failure */
91 u8 fan[2]; /* Register value: TACH count for fans >=30 */
92 u8 status; /* Detected channel alarms and fan failures */
93
94 /* Register values only written to */
95 u8 pwm[2]; /* Register value: Duty cycle 0..120 */
96 u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */
97 u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */
98 u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */
99
100 /* Register values initialized only once */
101 u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
102 u8 rpm_range; /* Index in above rpm_ranges table */
103};
104
105static struct max6639_data *max6639_update_device(struct device *dev)
106{
107 struct i2c_client *client = to_i2c_client(dev);
108 struct max6639_data *data = i2c_get_clientdata(client);
109 struct max6639_data *ret = data;
110 int i;
111 int status_reg;
112
113 mutex_lock(&data->update_lock);
114
115 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
116 int res;
117
118 dev_dbg(&client->dev, "Starting max6639 update\n");
119
120 status_reg = i2c_smbus_read_byte_data(client,
121 MAX6639_REG_STATUS);
122 if (status_reg < 0) {
123 ret = ERR_PTR(status_reg);
124 goto abort;
125 }
126
127 data->status = status_reg;
128
129 for (i = 0; i < 2; i++) {
130 res = i2c_smbus_read_byte_data(client,
131 MAX6639_REG_FAN_CNT(i));
132 if (res < 0) {
133 ret = ERR_PTR(res);
134 goto abort;
135 }
136 data->fan[i] = res;
137
138 res = i2c_smbus_read_byte_data(client,
139 MAX6639_REG_TEMP_EXT(i));
140 if (res < 0) {
141 ret = ERR_PTR(res);
142 goto abort;
143 }
144 data->temp[i] = res >> 5;
145 data->temp_fault[i] = res & 0x01;
146
147 res = i2c_smbus_read_byte_data(client,
148 MAX6639_REG_TEMP(i));
149 if (res < 0) {
150 ret = ERR_PTR(res);
151 goto abort;
152 }
153 data->temp[i] |= res << 3;
154 }
155
156 data->last_updated = jiffies;
157 data->valid = 1;
158 }
159abort:
160 mutex_unlock(&data->update_lock);
161
162 return ret;
163}
164
165static ssize_t show_temp_input(struct device *dev,
166 struct device_attribute *dev_attr, char *buf)
167{
168 long temp;
169 struct max6639_data *data = max6639_update_device(dev);
170 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
171
172 if (IS_ERR(data))
173 return PTR_ERR(data);
174
175 temp = data->temp[attr->index] * 125;
176 return sprintf(buf, "%ld\n", temp);
177}
178
179static ssize_t show_temp_fault(struct device *dev,
180 struct device_attribute *dev_attr, char *buf)
181{
182 struct max6639_data *data = max6639_update_device(dev);
183 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
184
185 if (IS_ERR(data))
186 return PTR_ERR(data);
187
188 return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
189}
190
191static ssize_t show_temp_max(struct device *dev,
192 struct device_attribute *dev_attr, char *buf)
193{
194 struct i2c_client *client = to_i2c_client(dev);
195 struct max6639_data *data = i2c_get_clientdata(client);
196 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
197
198 return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
199}
200
201static ssize_t set_temp_max(struct device *dev,
202 struct device_attribute *dev_attr,
203 const char *buf, size_t count)
204{
205 struct i2c_client *client = to_i2c_client(dev);
206 struct max6639_data *data = i2c_get_clientdata(client);
207 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
208 unsigned long val;
209 int res;
210
211 res = strict_strtoul(buf, 10, &val);
212 if (res)
213 return res;
214
215 mutex_lock(&data->update_lock);
216 data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
217 i2c_smbus_write_byte_data(client,
218 MAX6639_REG_THERM_LIMIT(attr->index),
219 data->temp_therm[attr->index]);
220 mutex_unlock(&data->update_lock);
221 return count;
222}
223
224static ssize_t show_temp_crit(struct device *dev,
225 struct device_attribute *dev_attr, char *buf)
226{
227 struct i2c_client *client = to_i2c_client(dev);
228 struct max6639_data *data = i2c_get_clientdata(client);
229 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
230
231 return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
232}
233
234static ssize_t set_temp_crit(struct device *dev,
235 struct device_attribute *dev_attr,
236 const char *buf, size_t count)
237{
238 struct i2c_client *client = to_i2c_client(dev);
239 struct max6639_data *data = i2c_get_clientdata(client);
240 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
241 unsigned long val;
242 int res;
243
244 res = strict_strtoul(buf, 10, &val);
245 if (res)
246 return res;
247
248 mutex_lock(&data->update_lock);
249 data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
250 i2c_smbus_write_byte_data(client,
251 MAX6639_REG_ALERT_LIMIT(attr->index),
252 data->temp_alert[attr->index]);
253 mutex_unlock(&data->update_lock);
254 return count;
255}
256
257static ssize_t show_temp_emergency(struct device *dev,
258 struct device_attribute *dev_attr,
259 char *buf)
260{
261 struct i2c_client *client = to_i2c_client(dev);
262 struct max6639_data *data = i2c_get_clientdata(client);
263 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
264
265 return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
266}
267
268static ssize_t set_temp_emergency(struct device *dev,
269 struct device_attribute *dev_attr,
270 const char *buf, size_t count)
271{
272 struct i2c_client *client = to_i2c_client(dev);
273 struct max6639_data *data = i2c_get_clientdata(client);
274 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
275 unsigned long val;
276 int res;
277
278 res = strict_strtoul(buf, 10, &val);
279 if (res)
280 return res;
281
282 mutex_lock(&data->update_lock);
283 data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
284 i2c_smbus_write_byte_data(client,
285 MAX6639_REG_OT_LIMIT(attr->index),
286 data->temp_ot[attr->index]);
287 mutex_unlock(&data->update_lock);
288 return count;
289}
290
291static ssize_t show_pwm(struct device *dev,
292 struct device_attribute *dev_attr, char *buf)
293{
294 struct i2c_client *client = to_i2c_client(dev);
295 struct max6639_data *data = i2c_get_clientdata(client);
296 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
297
298 return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
299}
300
301static ssize_t set_pwm(struct device *dev,
302 struct device_attribute *dev_attr,
303 const char *buf, size_t count)
304{
305 struct i2c_client *client = to_i2c_client(dev);
306 struct max6639_data *data = i2c_get_clientdata(client);
307 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
308 unsigned long val;
309 int res;
310
311 res = strict_strtoul(buf, 10, &val);
312 if (res)
313 return res;
314
315 val = SENSORS_LIMIT(val, 0, 255);
316
317 mutex_lock(&data->update_lock);
318 data->pwm[attr->index] = (u8)(val * 120 / 255);
319 i2c_smbus_write_byte_data(client,
320 MAX6639_REG_TARGTDUTY(attr->index),
321 data->pwm[attr->index]);
322 mutex_unlock(&data->update_lock);
323 return count;
324}
325
326static ssize_t show_fan_input(struct device *dev,
327 struct device_attribute *dev_attr, char *buf)
328{
329 struct max6639_data *data = max6639_update_device(dev);
330 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
331
332 if (IS_ERR(data))
333 return PTR_ERR(data);
334
335 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
336 data->ppr, data->rpm_range));
337}
338
339static ssize_t show_alarm(struct device *dev,
340 struct device_attribute *dev_attr, char *buf)
341{
342 struct max6639_data *data = max6639_update_device(dev);
343 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
344
345 if (IS_ERR(data))
346 return PTR_ERR(data);
347
348 return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
349}
350
351static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
352static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
353static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
354static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
355static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
356 set_temp_max, 0);
357static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
358 set_temp_max, 1);
359static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit,
360 set_temp_crit, 0);
361static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit,
362 set_temp_crit, 1);
363static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO,
364 show_temp_emergency, set_temp_emergency, 0);
365static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO,
366 show_temp_emergency, set_temp_emergency, 1);
367static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0);
368static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1);
369static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
370static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
371static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1);
372static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0);
373static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3);
374static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2);
375static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7);
376static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6);
377static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5);
378static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 4);
379
380
381static struct attribute *max6639_attributes[] = {
382 &sensor_dev_attr_temp1_input.dev_attr.attr,
383 &sensor_dev_attr_temp2_input.dev_attr.attr,
384 &sensor_dev_attr_temp1_fault.dev_attr.attr,
385 &sensor_dev_attr_temp2_fault.dev_attr.attr,
386 &sensor_dev_attr_temp1_max.dev_attr.attr,
387 &sensor_dev_attr_temp2_max.dev_attr.attr,
388 &sensor_dev_attr_temp1_crit.dev_attr.attr,
389 &sensor_dev_attr_temp2_crit.dev_attr.attr,
390 &sensor_dev_attr_temp1_emergency.dev_attr.attr,
391 &sensor_dev_attr_temp2_emergency.dev_attr.attr,
392 &sensor_dev_attr_pwm1.dev_attr.attr,
393 &sensor_dev_attr_pwm2.dev_attr.attr,
394 &sensor_dev_attr_fan1_input.dev_attr.attr,
395 &sensor_dev_attr_fan2_input.dev_attr.attr,
396 &sensor_dev_attr_fan1_fault.dev_attr.attr,
397 &sensor_dev_attr_fan2_fault.dev_attr.attr,
398 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
399 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
400 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
401 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
402 &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
403 &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
404 NULL
405};
406
407static const struct attribute_group max6639_group = {
408 .attrs = max6639_attributes,
409};
410
411/*
412 * returns respective index in rpm_ranges table
413 * 1 by default on invalid range
414 */
415static int rpm_range_to_reg(int range)
416{
417 int i;
418
419 for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
420 if (rpm_ranges[i] == range)
421 return i;
422 }
423
424 return 1; /* default: 4000 RPM */
425}
426
427static int max6639_init_client(struct i2c_client *client)
428{
429 struct max6639_data *data = i2c_get_clientdata(client);
430 struct max6639_platform_data *max6639_info =
431 client->dev.platform_data;
432 int i = 0;
433 int rpm_range = 1; /* default: 4000 RPM */
434 int err = 0;
435
436 /* Reset chip to default values, see below for GCONFIG setup */
437 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
438 MAX6639_GCONFIG_POR);
439 if (err)
440 goto exit;
441
442 /* Fans pulse per revolution is 2 by default */
443 if (max6639_info && max6639_info->ppr > 0 &&
444 max6639_info->ppr < 5)
445 data->ppr = max6639_info->ppr;
446 else
447 data->ppr = 2;
448 data->ppr -= 1;
449 err = i2c_smbus_write_byte_data(client,
450 MAX6639_REG_FAN_PPR(i),
451 data->ppr << 5);
452 if (err)
453 goto exit;
454
455 if (max6639_info)
456 rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
457 data->rpm_range = rpm_range;
458
459 for (i = 0; i < 2; i++) {
460
461 /* Fans config PWM, RPM */
462 err = i2c_smbus_write_byte_data(client,
463 MAX6639_REG_FAN_CONFIG1(i),
464 MAX6639_FAN_CONFIG1_PWM | rpm_range);
465 if (err)
466 goto exit;
467
468 /* Fans PWM polarity high by default */
469 if (max6639_info && max6639_info->pwm_polarity == 0)
470 err = i2c_smbus_write_byte_data(client,
471 MAX6639_REG_FAN_CONFIG2a(i), 0x00);
472 else
473 err = i2c_smbus_write_byte_data(client,
474 MAX6639_REG_FAN_CONFIG2a(i), 0x02);
475 if (err)
476 goto exit;
477
478 /*
479 * /THERM full speed enable,
480 * PWM frequency 25kHz, see also GCONFIG below
481 */
482 err = i2c_smbus_write_byte_data(client,
483 MAX6639_REG_FAN_CONFIG3(i),
484 MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
485 if (err)
486 goto exit;
487
488 /* Max. temp. 80C/90C/100C */
489 data->temp_therm[i] = 80;
490 data->temp_alert[i] = 90;
491 data->temp_ot[i] = 100;
492 err = i2c_smbus_write_byte_data(client,
493 MAX6639_REG_THERM_LIMIT(i),
494 data->temp_therm[i]);
495 if (err)
496 goto exit;
497 err = i2c_smbus_write_byte_data(client,
498 MAX6639_REG_ALERT_LIMIT(i),
499 data->temp_alert[i]);
500 if (err)
501 goto exit;
502 err = i2c_smbus_write_byte_data(client,
503 MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
504 if (err)
505 goto exit;
506
507 /* PWM 120/120 (i.e. 100%) */
508 data->pwm[i] = 120;
509 err = i2c_smbus_write_byte_data(client,
510 MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
511 if (err)
512 goto exit;
513 }
514 /* Start monitoring */
515 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
516 MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
517 MAX6639_GCONFIG_PWM_FREQ_HI);
518exit:
519 return err;
520}
521
522/* Return 0 if detection is successful, -ENODEV otherwise */
523static int max6639_detect(struct i2c_client *client,
524 struct i2c_board_info *info)
525{
526 struct i2c_adapter *adapter = client->adapter;
527 int dev_id, manu_id;
528
529 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
530 return -ENODEV;
531
532 /* Actual detection via device and manufacturer ID */
533 dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
534 manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
535 if (dev_id != 0x58 || manu_id != 0x4D)
536 return -ENODEV;
537
538 strlcpy(info->type, "max6639", I2C_NAME_SIZE);
539
540 return 0;
541}
542
543static int max6639_probe(struct i2c_client *client,
544 const struct i2c_device_id *id)
545{
546 struct max6639_data *data;
547 int err;
548
549 data = kzalloc(sizeof(struct max6639_data), GFP_KERNEL);
550 if (!data) {
551 err = -ENOMEM;
552 goto exit;
553 }
554
555 i2c_set_clientdata(client, data);
556 mutex_init(&data->update_lock);
557
558 /* Initialize the max6639 chip */
559 err = max6639_init_client(client);
560 if (err < 0)
561 goto error_free;
562
563 /* Register sysfs hooks */
564 err = sysfs_create_group(&client->dev.kobj, &max6639_group);
565 if (err)
566 goto error_free;
567
568 data->hwmon_dev = hwmon_device_register(&client->dev);
569 if (IS_ERR(data->hwmon_dev)) {
570 err = PTR_ERR(data->hwmon_dev);
571 goto error_remove;
572 }
573
574 dev_info(&client->dev, "temperature sensor and fan control found\n");
575
576 return 0;
577
578error_remove:
579 sysfs_remove_group(&client->dev.kobj, &max6639_group);
580error_free:
581 kfree(data);
582exit:
583 return err;
584}
585
586static int max6639_remove(struct i2c_client *client)
587{
588 struct max6639_data *data = i2c_get_clientdata(client);
589
590 hwmon_device_unregister(data->hwmon_dev);
591 sysfs_remove_group(&client->dev.kobj, &max6639_group);
592
593 kfree(data);
594 return 0;
595}
596
597static int max6639_suspend(struct i2c_client *client, pm_message_t mesg)
598{
599 int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
600 if (data < 0)
601 return data;
602
603 return i2c_smbus_write_byte_data(client,
604 MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY);
605}
606
607static int max6639_resume(struct i2c_client *client)
608{
609 int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
610 if (data < 0)
611 return data;
612
613 return i2c_smbus_write_byte_data(client,
614 MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY);
615}
616
617static const struct i2c_device_id max6639_id[] = {
618 {"max6639", 0},
619 { }
620};
621
622MODULE_DEVICE_TABLE(i2c, max6639_id);
623
624static struct i2c_driver max6639_driver = {
625 .class = I2C_CLASS_HWMON,
626 .driver = {
627 .name = "max6639",
628 },
629 .probe = max6639_probe,
630 .remove = max6639_remove,
631 .suspend = max6639_suspend,
632 .resume = max6639_resume,
633 .id_table = max6639_id,
634 .detect = max6639_detect,
635 .address_list = normal_i2c,
636};
637
638static int __init max6639_init(void)
639{
640 return i2c_add_driver(&max6639_driver);
641}
642
643static void __exit max6639_exit(void)
644{
645 i2c_del_driver(&max6639_driver);
646}
647
648MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
649MODULE_DESCRIPTION("max6639 driver");
650MODULE_LICENSE("GPL");
651
652module_init(max6639_init);
653module_exit(max6639_exit);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * max6639.c - Support for Maxim MAX6639
4 *
5 * 2-Channel Temperature Monitor with Dual PWM Fan-Speed Controller
6 *
7 * Copyright (C) 2010, 2011 Roland Stigge <stigge@antcom.de>
8 *
9 * based on the initial MAX6639 support from semptian.net
10 * by He Changqing <hechangqing@semptian.com>
11 */
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/jiffies.h>
17#include <linux/i2c.h>
18#include <linux/hwmon.h>
19#include <linux/hwmon-sysfs.h>
20#include <linux/err.h>
21#include <linux/mutex.h>
22#include <linux/platform_data/max6639.h>
23
24/* Addresses to scan */
25static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
26
27/* The MAX6639 registers, valid channel numbers: 0, 1 */
28#define MAX6639_REG_TEMP(ch) (0x00 + (ch))
29#define MAX6639_REG_STATUS 0x02
30#define MAX6639_REG_OUTPUT_MASK 0x03
31#define MAX6639_REG_GCONFIG 0x04
32#define MAX6639_REG_TEMP_EXT(ch) (0x05 + (ch))
33#define MAX6639_REG_ALERT_LIMIT(ch) (0x08 + (ch))
34#define MAX6639_REG_OT_LIMIT(ch) (0x0A + (ch))
35#define MAX6639_REG_THERM_LIMIT(ch) (0x0C + (ch))
36#define MAX6639_REG_FAN_CONFIG1(ch) (0x10 + (ch) * 4)
37#define MAX6639_REG_FAN_CONFIG2a(ch) (0x11 + (ch) * 4)
38#define MAX6639_REG_FAN_CONFIG2b(ch) (0x12 + (ch) * 4)
39#define MAX6639_REG_FAN_CONFIG3(ch) (0x13 + (ch) * 4)
40#define MAX6639_REG_FAN_CNT(ch) (0x20 + (ch))
41#define MAX6639_REG_TARGET_CNT(ch) (0x22 + (ch))
42#define MAX6639_REG_FAN_PPR(ch) (0x24 + (ch))
43#define MAX6639_REG_TARGTDUTY(ch) (0x26 + (ch))
44#define MAX6639_REG_FAN_START_TEMP(ch) (0x28 + (ch))
45#define MAX6639_REG_DEVID 0x3D
46#define MAX6639_REG_MANUID 0x3E
47#define MAX6639_REG_DEVREV 0x3F
48
49/* Register bits */
50#define MAX6639_GCONFIG_STANDBY 0x80
51#define MAX6639_GCONFIG_POR 0x40
52#define MAX6639_GCONFIG_DISABLE_TIMEOUT 0x20
53#define MAX6639_GCONFIG_CH2_LOCAL 0x10
54#define MAX6639_GCONFIG_PWM_FREQ_HI 0x08
55
56#define MAX6639_FAN_CONFIG1_PWM 0x80
57
58#define MAX6639_FAN_CONFIG3_THERM_FULL_SPEED 0x40
59
60static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
61
62#define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \
63 0 : (rpm_ranges[rpm_range] * 30) / (val))
64#define TEMP_LIMIT_TO_REG(val) clamp_val((val) / 1000, 0, 255)
65
66/*
67 * Client data (each client gets its own)
68 */
69struct max6639_data {
70 struct i2c_client *client;
71 struct mutex update_lock;
72 bool valid; /* true if following fields are valid */
73 unsigned long last_updated; /* In jiffies */
74
75 /* Register values sampled regularly */
76 u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */
77 bool temp_fault[2]; /* Detected temperature diode failure */
78 u8 fan[2]; /* Register value: TACH count for fans >=30 */
79 u8 status; /* Detected channel alarms and fan failures */
80
81 /* Register values only written to */
82 u8 pwm[2]; /* Register value: Duty cycle 0..120 */
83 u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */
84 u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */
85 u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */
86
87 /* Register values initialized only once */
88 u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
89 u8 rpm_range; /* Index in above rpm_ranges table */
90
91 /* Optional regulator for FAN supply */
92 struct regulator *reg;
93};
94
95static struct max6639_data *max6639_update_device(struct device *dev)
96{
97 struct max6639_data *data = dev_get_drvdata(dev);
98 struct i2c_client *client = data->client;
99 struct max6639_data *ret = data;
100 int i;
101 int status_reg;
102
103 mutex_lock(&data->update_lock);
104
105 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
106 int res;
107
108 dev_dbg(&client->dev, "Starting max6639 update\n");
109
110 status_reg = i2c_smbus_read_byte_data(client,
111 MAX6639_REG_STATUS);
112 if (status_reg < 0) {
113 ret = ERR_PTR(status_reg);
114 goto abort;
115 }
116
117 data->status = status_reg;
118
119 for (i = 0; i < 2; i++) {
120 res = i2c_smbus_read_byte_data(client,
121 MAX6639_REG_FAN_CNT(i));
122 if (res < 0) {
123 ret = ERR_PTR(res);
124 goto abort;
125 }
126 data->fan[i] = res;
127
128 res = i2c_smbus_read_byte_data(client,
129 MAX6639_REG_TEMP_EXT(i));
130 if (res < 0) {
131 ret = ERR_PTR(res);
132 goto abort;
133 }
134 data->temp[i] = res >> 5;
135 data->temp_fault[i] = res & 0x01;
136
137 res = i2c_smbus_read_byte_data(client,
138 MAX6639_REG_TEMP(i));
139 if (res < 0) {
140 ret = ERR_PTR(res);
141 goto abort;
142 }
143 data->temp[i] |= res << 3;
144 }
145
146 data->last_updated = jiffies;
147 data->valid = true;
148 }
149abort:
150 mutex_unlock(&data->update_lock);
151
152 return ret;
153}
154
155static ssize_t temp_input_show(struct device *dev,
156 struct device_attribute *dev_attr, char *buf)
157{
158 long temp;
159 struct max6639_data *data = max6639_update_device(dev);
160 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
161
162 if (IS_ERR(data))
163 return PTR_ERR(data);
164
165 temp = data->temp[attr->index] * 125;
166 return sprintf(buf, "%ld\n", temp);
167}
168
169static ssize_t temp_fault_show(struct device *dev,
170 struct device_attribute *dev_attr, char *buf)
171{
172 struct max6639_data *data = max6639_update_device(dev);
173 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
174
175 if (IS_ERR(data))
176 return PTR_ERR(data);
177
178 return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
179}
180
181static ssize_t temp_max_show(struct device *dev,
182 struct device_attribute *dev_attr, char *buf)
183{
184 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
185 struct max6639_data *data = dev_get_drvdata(dev);
186
187 return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
188}
189
190static ssize_t temp_max_store(struct device *dev,
191 struct device_attribute *dev_attr,
192 const char *buf, size_t count)
193{
194 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
195 struct max6639_data *data = dev_get_drvdata(dev);
196 struct i2c_client *client = data->client;
197 unsigned long val;
198 int res;
199
200 res = kstrtoul(buf, 10, &val);
201 if (res)
202 return res;
203
204 mutex_lock(&data->update_lock);
205 data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
206 i2c_smbus_write_byte_data(client,
207 MAX6639_REG_THERM_LIMIT(attr->index),
208 data->temp_therm[attr->index]);
209 mutex_unlock(&data->update_lock);
210 return count;
211}
212
213static ssize_t temp_crit_show(struct device *dev,
214 struct device_attribute *dev_attr, char *buf)
215{
216 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
217 struct max6639_data *data = dev_get_drvdata(dev);
218
219 return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
220}
221
222static ssize_t temp_crit_store(struct device *dev,
223 struct device_attribute *dev_attr,
224 const char *buf, size_t count)
225{
226 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
227 struct max6639_data *data = dev_get_drvdata(dev);
228 struct i2c_client *client = data->client;
229 unsigned long val;
230 int res;
231
232 res = kstrtoul(buf, 10, &val);
233 if (res)
234 return res;
235
236 mutex_lock(&data->update_lock);
237 data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
238 i2c_smbus_write_byte_data(client,
239 MAX6639_REG_ALERT_LIMIT(attr->index),
240 data->temp_alert[attr->index]);
241 mutex_unlock(&data->update_lock);
242 return count;
243}
244
245static ssize_t temp_emergency_show(struct device *dev,
246 struct device_attribute *dev_attr,
247 char *buf)
248{
249 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
250 struct max6639_data *data = dev_get_drvdata(dev);
251
252 return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
253}
254
255static ssize_t temp_emergency_store(struct device *dev,
256 struct device_attribute *dev_attr,
257 const char *buf, size_t count)
258{
259 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
260 struct max6639_data *data = dev_get_drvdata(dev);
261 struct i2c_client *client = data->client;
262 unsigned long val;
263 int res;
264
265 res = kstrtoul(buf, 10, &val);
266 if (res)
267 return res;
268
269 mutex_lock(&data->update_lock);
270 data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
271 i2c_smbus_write_byte_data(client,
272 MAX6639_REG_OT_LIMIT(attr->index),
273 data->temp_ot[attr->index]);
274 mutex_unlock(&data->update_lock);
275 return count;
276}
277
278static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr,
279 char *buf)
280{
281 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
282 struct max6639_data *data = dev_get_drvdata(dev);
283
284 return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
285}
286
287static ssize_t pwm_store(struct device *dev,
288 struct device_attribute *dev_attr, const char *buf,
289 size_t count)
290{
291 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
292 struct max6639_data *data = dev_get_drvdata(dev);
293 struct i2c_client *client = data->client;
294 unsigned long val;
295 int res;
296
297 res = kstrtoul(buf, 10, &val);
298 if (res)
299 return res;
300
301 val = clamp_val(val, 0, 255);
302
303 mutex_lock(&data->update_lock);
304 data->pwm[attr->index] = (u8)(val * 120 / 255);
305 i2c_smbus_write_byte_data(client,
306 MAX6639_REG_TARGTDUTY(attr->index),
307 data->pwm[attr->index]);
308 mutex_unlock(&data->update_lock);
309 return count;
310}
311
312static ssize_t fan_input_show(struct device *dev,
313 struct device_attribute *dev_attr, char *buf)
314{
315 struct max6639_data *data = max6639_update_device(dev);
316 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
317
318 if (IS_ERR(data))
319 return PTR_ERR(data);
320
321 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
322 data->rpm_range));
323}
324
325static ssize_t alarm_show(struct device *dev,
326 struct device_attribute *dev_attr, char *buf)
327{
328 struct max6639_data *data = max6639_update_device(dev);
329 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
330
331 if (IS_ERR(data))
332 return PTR_ERR(data);
333
334 return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
335}
336
337static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
338static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
339static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
340static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
341static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
342static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
343static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0);
344static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1);
345static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0);
346static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1);
347static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
348static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
349static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
350static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
351static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1);
352static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0);
353static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3);
354static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2);
355static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7);
356static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6);
357static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5);
358static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4);
359
360
361static struct attribute *max6639_attrs[] = {
362 &sensor_dev_attr_temp1_input.dev_attr.attr,
363 &sensor_dev_attr_temp2_input.dev_attr.attr,
364 &sensor_dev_attr_temp1_fault.dev_attr.attr,
365 &sensor_dev_attr_temp2_fault.dev_attr.attr,
366 &sensor_dev_attr_temp1_max.dev_attr.attr,
367 &sensor_dev_attr_temp2_max.dev_attr.attr,
368 &sensor_dev_attr_temp1_crit.dev_attr.attr,
369 &sensor_dev_attr_temp2_crit.dev_attr.attr,
370 &sensor_dev_attr_temp1_emergency.dev_attr.attr,
371 &sensor_dev_attr_temp2_emergency.dev_attr.attr,
372 &sensor_dev_attr_pwm1.dev_attr.attr,
373 &sensor_dev_attr_pwm2.dev_attr.attr,
374 &sensor_dev_attr_fan1_input.dev_attr.attr,
375 &sensor_dev_attr_fan2_input.dev_attr.attr,
376 &sensor_dev_attr_fan1_fault.dev_attr.attr,
377 &sensor_dev_attr_fan2_fault.dev_attr.attr,
378 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
379 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
380 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
381 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
382 &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
383 &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
384 NULL
385};
386ATTRIBUTE_GROUPS(max6639);
387
388/*
389 * returns respective index in rpm_ranges table
390 * 1 by default on invalid range
391 */
392static int rpm_range_to_reg(int range)
393{
394 int i;
395
396 for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
397 if (rpm_ranges[i] == range)
398 return i;
399 }
400
401 return 1; /* default: 4000 RPM */
402}
403
404static int max6639_init_client(struct i2c_client *client,
405 struct max6639_data *data)
406{
407 struct max6639_platform_data *max6639_info =
408 dev_get_platdata(&client->dev);
409 int i;
410 int rpm_range = 1; /* default: 4000 RPM */
411 int err;
412
413 /* Reset chip to default values, see below for GCONFIG setup */
414 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
415 MAX6639_GCONFIG_POR);
416 if (err)
417 goto exit;
418
419 /* Fans pulse per revolution is 2 by default */
420 if (max6639_info && max6639_info->ppr > 0 &&
421 max6639_info->ppr < 5)
422 data->ppr = max6639_info->ppr;
423 else
424 data->ppr = 2;
425 data->ppr -= 1;
426
427 if (max6639_info)
428 rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
429 data->rpm_range = rpm_range;
430
431 for (i = 0; i < 2; i++) {
432
433 /* Set Fan pulse per revolution */
434 err = i2c_smbus_write_byte_data(client,
435 MAX6639_REG_FAN_PPR(i),
436 data->ppr << 6);
437 if (err)
438 goto exit;
439
440 /* Fans config PWM, RPM */
441 err = i2c_smbus_write_byte_data(client,
442 MAX6639_REG_FAN_CONFIG1(i),
443 MAX6639_FAN_CONFIG1_PWM | rpm_range);
444 if (err)
445 goto exit;
446
447 /* Fans PWM polarity high by default */
448 if (max6639_info && max6639_info->pwm_polarity == 0)
449 err = i2c_smbus_write_byte_data(client,
450 MAX6639_REG_FAN_CONFIG2a(i), 0x00);
451 else
452 err = i2c_smbus_write_byte_data(client,
453 MAX6639_REG_FAN_CONFIG2a(i), 0x02);
454 if (err)
455 goto exit;
456
457 /*
458 * /THERM full speed enable,
459 * PWM frequency 25kHz, see also GCONFIG below
460 */
461 err = i2c_smbus_write_byte_data(client,
462 MAX6639_REG_FAN_CONFIG3(i),
463 MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
464 if (err)
465 goto exit;
466
467 /* Max. temp. 80C/90C/100C */
468 data->temp_therm[i] = 80;
469 data->temp_alert[i] = 90;
470 data->temp_ot[i] = 100;
471 err = i2c_smbus_write_byte_data(client,
472 MAX6639_REG_THERM_LIMIT(i),
473 data->temp_therm[i]);
474 if (err)
475 goto exit;
476 err = i2c_smbus_write_byte_data(client,
477 MAX6639_REG_ALERT_LIMIT(i),
478 data->temp_alert[i]);
479 if (err)
480 goto exit;
481 err = i2c_smbus_write_byte_data(client,
482 MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
483 if (err)
484 goto exit;
485
486 /* PWM 120/120 (i.e. 100%) */
487 data->pwm[i] = 120;
488 err = i2c_smbus_write_byte_data(client,
489 MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
490 if (err)
491 goto exit;
492 }
493 /* Start monitoring */
494 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
495 MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
496 MAX6639_GCONFIG_PWM_FREQ_HI);
497exit:
498 return err;
499}
500
501/* Return 0 if detection is successful, -ENODEV otherwise */
502static int max6639_detect(struct i2c_client *client,
503 struct i2c_board_info *info)
504{
505 struct i2c_adapter *adapter = client->adapter;
506 int dev_id, manu_id;
507
508 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
509 return -ENODEV;
510
511 /* Actual detection via device and manufacturer ID */
512 dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
513 manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
514 if (dev_id != 0x58 || manu_id != 0x4D)
515 return -ENODEV;
516
517 strscpy(info->type, "max6639", I2C_NAME_SIZE);
518
519 return 0;
520}
521
522static void max6639_regulator_disable(void *data)
523{
524 regulator_disable(data);
525}
526
527static int max6639_probe(struct i2c_client *client)
528{
529 struct device *dev = &client->dev;
530 struct max6639_data *data;
531 struct device *hwmon_dev;
532 int err;
533
534 data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL);
535 if (!data)
536 return -ENOMEM;
537
538 data->client = client;
539
540 data->reg = devm_regulator_get_optional(dev, "fan");
541 if (IS_ERR(data->reg)) {
542 if (PTR_ERR(data->reg) != -ENODEV)
543 return PTR_ERR(data->reg);
544
545 data->reg = NULL;
546 } else {
547 /* Spin up fans */
548 err = regulator_enable(data->reg);
549 if (err) {
550 dev_err(dev, "Failed to enable fan supply: %d\n", err);
551 return err;
552 }
553 err = devm_add_action_or_reset(dev, max6639_regulator_disable,
554 data->reg);
555 if (err) {
556 dev_err(dev, "Failed to register action: %d\n", err);
557 return err;
558 }
559 }
560
561 mutex_init(&data->update_lock);
562
563 /* Initialize the max6639 chip */
564 err = max6639_init_client(client, data);
565 if (err < 0)
566 return err;
567
568 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
569 data,
570 max6639_groups);
571 return PTR_ERR_OR_ZERO(hwmon_dev);
572}
573
574static int max6639_suspend(struct device *dev)
575{
576 struct i2c_client *client = to_i2c_client(dev);
577 struct max6639_data *data = dev_get_drvdata(dev);
578 int ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
579
580 if (ret < 0)
581 return ret;
582
583 if (data->reg)
584 regulator_disable(data->reg);
585
586 return i2c_smbus_write_byte_data(client,
587 MAX6639_REG_GCONFIG, ret | MAX6639_GCONFIG_STANDBY);
588}
589
590static int max6639_resume(struct device *dev)
591{
592 struct i2c_client *client = to_i2c_client(dev);
593 struct max6639_data *data = dev_get_drvdata(dev);
594 int ret;
595
596 if (data->reg) {
597 ret = regulator_enable(data->reg);
598 if (ret) {
599 dev_err(dev, "Failed to enable fan supply: %d\n", ret);
600 return ret;
601 }
602 }
603
604 ret = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
605 if (ret < 0)
606 return ret;
607
608 return i2c_smbus_write_byte_data(client,
609 MAX6639_REG_GCONFIG, ret & ~MAX6639_GCONFIG_STANDBY);
610}
611
612static const struct i2c_device_id max6639_id[] = {
613 {"max6639", 0},
614 { }
615};
616
617MODULE_DEVICE_TABLE(i2c, max6639_id);
618
619static DEFINE_SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume);
620
621static struct i2c_driver max6639_driver = {
622 .class = I2C_CLASS_HWMON,
623 .driver = {
624 .name = "max6639",
625 .pm = pm_sleep_ptr(&max6639_pm_ops),
626 },
627 .probe_new = max6639_probe,
628 .id_table = max6639_id,
629 .detect = max6639_detect,
630 .address_list = normal_i2c,
631};
632
633module_i2c_driver(max6639_driver);
634
635MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
636MODULE_DESCRIPTION("max6639 driver");
637MODULE_LICENSE("GPL");