projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
hwmon: Driver for Maxim MAX6639
[deliverable/linux.git] / drivers / hwmon / max6639.c
CommitLineData
a5b79d62 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
68#define MAX6639_FAN_CONFIG1_PWM 0x80
69
70static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
71
72#define FAN_FROM_REG(val, div, rpm_range) ((val) == 0 ? -1 : \
73 (val) == 255 ? 0 : (rpm_ranges[rpm_range] * 30) / ((div + 1) * (val)))
74#define TEMP_LIMIT_TO_REG(val) SENSORS_LIMIT((val) / 1000, 0, 255)
75
76/*
77 * Client data (each client gets its own)
78 */
79struct max6639_data {
80 struct device *hwmon_dev;
81 struct mutex update_lock;
82 char valid; /* !=0 if following fields are valid */
83 unsigned long last_updated; /* In jiffies */
84
85 /* Register values sampled regularly */
86 u16 temp[2]; /* Temperature, in 1/8 C, 0..255 C */
87 bool temp_fault[2]; /* Detected temperature diode failure */
88 u8 fan[2]; /* Register value: TACH count for fans >=30 */
89 u8 status; /* Detected channel alarms and fan failures */
90
91 /* Register values only written to */
92 u8 pwm[2]; /* Register value: Duty cycle 0..120 */
93 u8 temp_therm[2]; /* THERM Temperature, 0..255 C (->_max) */
94 u8 temp_alert[2]; /* ALERT Temperature, 0..255 C (->_crit) */
95 u8 temp_ot[2]; /* OT Temperature, 0..255 C (->_emergency) */
96
97 /* Register values initialized only once */
98 u8 ppr; /* Pulses per rotation 0..3 for 1..4 ppr */
99 u8 rpm_range; /* Index in above rpm_ranges table */
100};
101
102static struct max6639_data *max6639_update_device(struct device *dev)
103{
104 struct i2c_client *client = to_i2c_client(dev);
105 struct max6639_data *data = i2c_get_clientdata(client);
106 struct max6639_data *ret = data;
107 int i;
108 int status_reg;
109
110 mutex_lock(&data->update_lock);
111
112 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
113 int res;
114
115 dev_dbg(&client->dev, "Starting max6639 update\n");
116
117 status_reg = i2c_smbus_read_byte_data(client,
118 MAX6639_REG_STATUS);
119 if (status_reg < 0) {
120 ret = ERR_PTR(status_reg);
121 goto abort;
122 }
123
124 data->status = status_reg;
125
126 for (i = 0; i < 2; i++) {
127 res = i2c_smbus_read_byte_data(client,
128 MAX6639_REG_FAN_CNT(i));
129 if (res < 0) {
130 ret = ERR_PTR(res);
131 goto abort;
132 }
133 data->fan[i] = res;
134
135 res = i2c_smbus_read_byte_data(client,
136 MAX6639_REG_TEMP_EXT(i));
137 if (res < 0) {
138 ret = ERR_PTR(res);
139 goto abort;
140 }
141 data->temp[i] = res >> 5;
142 data->temp_fault[i] = res & 0x01;
143
144 res = i2c_smbus_read_byte_data(client,
145 MAX6639_REG_TEMP(i));
146 if (res < 0) {
147 ret = ERR_PTR(res);
148 goto abort;
149 }
150 data->temp[i] |= res << 3;
151 }
152
153 data->last_updated = jiffies;
154 data->valid = 1;
155 }
156abort:
157 mutex_unlock(&data->update_lock);
158
159 return ret;
160}
161
162static ssize_t show_temp_input(struct device *dev,
163 struct device_attribute *dev_attr, char *buf)
164{
165 long temp;
166 struct max6639_data *data = max6639_update_device(dev);
167 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
168
169 if (IS_ERR(data))
170 return PTR_ERR(data);
171
172 temp = data->temp[attr->index] * 125;
173 return sprintf(buf, "%ld\n", temp);
174}
175
176static ssize_t show_temp_fault(struct device *dev,
177 struct device_attribute *dev_attr, char *buf)
178{
179 struct max6639_data *data = max6639_update_device(dev);
180 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
181
182 if (IS_ERR(data))
183 return PTR_ERR(data);
184
185 return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
186}
187
188static ssize_t show_temp_max(struct device *dev,
189 struct device_attribute *dev_attr, char *buf)
190{
191 struct i2c_client *client = to_i2c_client(dev);
192 struct max6639_data *data = i2c_get_clientdata(client);
193 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
194
195 return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
196}
197
198static ssize_t set_temp_max(struct device *dev,
199 struct device_attribute *dev_attr,
200 const char *buf, size_t count)
201{
202 struct i2c_client *client = to_i2c_client(dev);
203 struct max6639_data *data = i2c_get_clientdata(client);
204 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
205 unsigned long val;
206 int res;
207
208 res = strict_strtoul(buf, 10, &val);
209 if (res)
210 return res;
211
212 mutex_lock(&data->update_lock);
213 data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
214 i2c_smbus_write_byte_data(client,
215 MAX6639_REG_THERM_LIMIT(attr->index),
216 data->temp_therm[attr->index]);
217 mutex_unlock(&data->update_lock);
218 return count;
219}
220
221static ssize_t show_temp_crit(struct device *dev,
222 struct device_attribute *dev_attr, char *buf)
223{
224 struct i2c_client *client = to_i2c_client(dev);
225 struct max6639_data *data = i2c_get_clientdata(client);
226 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
227
228 return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
229}
230
231static ssize_t set_temp_crit(struct device *dev,
232 struct device_attribute *dev_attr,
233 const char *buf, size_t count)
234{
235 struct i2c_client *client = to_i2c_client(dev);
236 struct max6639_data *data = i2c_get_clientdata(client);
237 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
238 unsigned long val;
239 int res;
240
241 res = strict_strtoul(buf, 10, &val);
242 if (res)
243 return res;
244
245 mutex_lock(&data->update_lock);
246 data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
247 i2c_smbus_write_byte_data(client,
248 MAX6639_REG_ALERT_LIMIT(attr->index),
249 data->temp_alert[attr->index]);
250 mutex_unlock(&data->update_lock);
251 return count;
252}
253
254static ssize_t show_temp_emergency(struct device *dev,
255 struct device_attribute *dev_attr,
256 char *buf)
257{
258 struct i2c_client *client = to_i2c_client(dev);
259 struct max6639_data *data = i2c_get_clientdata(client);
260 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
261
262 return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
263}
264
265static ssize_t set_temp_emergency(struct device *dev,
266 struct device_attribute *dev_attr,
267 const char *buf, size_t count)
268{
269 struct i2c_client *client = to_i2c_client(dev);
270 struct max6639_data *data = i2c_get_clientdata(client);
271 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
272 unsigned long val;
273 int res;
274
275 res = strict_strtoul(buf, 10, &val);
276 if (res)
277 return res;
278
279 mutex_lock(&data->update_lock);
280 data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
281 i2c_smbus_write_byte_data(client,
282 MAX6639_REG_OT_LIMIT(attr->index),
283 data->temp_ot[attr->index]);
284 mutex_unlock(&data->update_lock);
285 return count;
286}
287
288static ssize_t show_pwm(struct device *dev,
289 struct device_attribute *dev_attr, char *buf)
290{
291 struct i2c_client *client = to_i2c_client(dev);
292 struct max6639_data *data = i2c_get_clientdata(client);
293 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
294
295 return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
296}
297
298static ssize_t set_pwm(struct device *dev,
299 struct device_attribute *dev_attr,
300 const char *buf, size_t count)
301{
302 struct i2c_client *client = to_i2c_client(dev);
303 struct max6639_data *data = i2c_get_clientdata(client);
304 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
305 unsigned long val;
306 int res;
307
308 res = strict_strtoul(buf, 10, &val);
309 if (res)
310 return res;
311
312 val = SENSORS_LIMIT(val, 0, 255);
313
314 mutex_lock(&data->update_lock);
315 data->pwm[attr->index] = (u8)(val * 120 / 255);
316 i2c_smbus_write_byte_data(client,
317 MAX6639_REG_TARGTDUTY(attr->index),
318 data->pwm[attr->index]);
319 mutex_unlock(&data->update_lock);
320 return count;
321}
322
323static ssize_t show_fan_input(struct device *dev,
324 struct device_attribute *dev_attr, char *buf)
325{
326 struct max6639_data *data = max6639_update_device(dev);
327 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
328
329 if (IS_ERR(data))
330 return PTR_ERR(data);
331
332 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
333 data->ppr, data->rpm_range));
334}
335
336static ssize_t show_alarm(struct device *dev,
337 struct device_attribute *dev_attr, char *buf)
338{
339 struct max6639_data *data = max6639_update_device(dev);
340 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
341
342 if (IS_ERR(data))
343 return PTR_ERR(data);
344
345 return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
346}
347
348static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
349static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
350static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
351static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
352static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
353 set_temp_max, 0);
354static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
355 set_temp_max, 1);
356static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit,
357 set_temp_crit, 0);
358static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit,
359 set_temp_crit, 1);
360static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO,
361 show_temp_emergency, set_temp_emergency, 0);
362static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO,
363 show_temp_emergency, set_temp_emergency, 1);
364static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0);
365static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1);
366static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
367static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
368static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1);
369static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0);
370static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3);
371static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2);
372static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7);
373static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6);
374static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5);
375static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 4);
376
377
378static struct attribute *max6639_attributes[] = {
379 &sensor_dev_attr_temp1_input.dev_attr.attr,
380 &sensor_dev_attr_temp2_input.dev_attr.attr,
381 &sensor_dev_attr_temp1_fault.dev_attr.attr,
382 &sensor_dev_attr_temp2_fault.dev_attr.attr,
383 &sensor_dev_attr_temp1_max.dev_attr.attr,
384 &sensor_dev_attr_temp2_max.dev_attr.attr,
385 &sensor_dev_attr_temp1_crit.dev_attr.attr,
386 &sensor_dev_attr_temp2_crit.dev_attr.attr,
387 &sensor_dev_attr_temp1_emergency.dev_attr.attr,
388 &sensor_dev_attr_temp2_emergency.dev_attr.attr,
389 &sensor_dev_attr_pwm1.dev_attr.attr,
390 &sensor_dev_attr_pwm2.dev_attr.attr,
391 &sensor_dev_attr_fan1_input.dev_attr.attr,
392 &sensor_dev_attr_fan2_input.dev_attr.attr,
393 &sensor_dev_attr_fan1_fault.dev_attr.attr,
394 &sensor_dev_attr_fan2_fault.dev_attr.attr,
395 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
396 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
397 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
398 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
399 &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
400 &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
401 NULL
402};
403
404static const struct attribute_group max6639_group = {
405 .attrs = max6639_attributes,
406};
407
408/*
409 * returns respective index in rpm_ranges table
410 * 1 by default on invalid range
411 */
412static int rpm_range_to_reg(int range)
413{
414 int i;
415
416 for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
417 if (rpm_ranges[i] == range)
418 return i;
419 }
420
421 return 1; /* default: 4000 RPM */
422}
423
424static int max6639_init_client(struct i2c_client *client)
425{
426 struct max6639_data *data = i2c_get_clientdata(client);
427 struct max6639_platform_data *max6639_info =
428 client->dev.platform_data;
429 int i = 0;
430 int rpm_range = 1; /* default: 4000 RPM */
431 int err = 0;
432
433 /* Reset chip to default values */
434 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
435 MAX6639_GCONFIG_POR);
436 if (err)
437 goto exit;
438
439 /* Fans pulse per revolution is 2 by default */
440 if (max6639_info && max6639_info->ppr > 0 &&
441 max6639_info->ppr < 5)
442 data->ppr = max6639_info->ppr;
443 else
444 data->ppr = 2;
445 data->ppr -= 1;
446 err = i2c_smbus_write_byte_data(client,
447 MAX6639_REG_FAN_PPR(i),
448 data->ppr << 5);
449 if (err)
450 goto exit;
451
452 if (max6639_info)
453 rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
454 data->rpm_range = rpm_range;
455
456 for (i = 0; i < 2; i++) {
457
458 /* Fans config PWM, RPM */
459 err = i2c_smbus_write_byte_data(client,
460 MAX6639_REG_FAN_CONFIG1(i),
461 MAX6639_FAN_CONFIG1_PWM | rpm_range);
462 if (err)
463 goto exit;
464
465 /* Fans PWM polarity high by default */
466 if (max6639_info && max6639_info->pwm_polarity == 0)
467 err = i2c_smbus_write_byte_data(client,
468 MAX6639_REG_FAN_CONFIG2a(i), 0x00);
469 else
470 err = i2c_smbus_write_byte_data(client,
471 MAX6639_REG_FAN_CONFIG2a(i), 0x02);
472 if (err)
473 goto exit;
474
475 /* Max. temp. 80C/90C/100C */
476 data->temp_therm[i] = 80;
477 data->temp_alert[i] = 90;
478 data->temp_ot[i] = 100;
479 err = i2c_smbus_write_byte_data(client,
480 MAX6639_REG_THERM_LIMIT(i),
481 data->temp_therm[i]);
482 if (err)
483 goto exit;
484 err = i2c_smbus_write_byte_data(client,
485 MAX6639_REG_ALERT_LIMIT(i),
486 data->temp_alert[i]);
487 if (err)
488 goto exit;
489 err = i2c_smbus_write_byte_data(client,
490 MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
491 if (err)
492 goto exit;
493
494 /* PWM 120/120 (i.e. 100%) */
495 data->pwm[i] = 120;
496 err = i2c_smbus_write_byte_data(client,
497 MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
498 if (err)
499 goto exit;
500 }
501 /* Start monitoring */
502 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
503 MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL);
504exit:
505 return err;
506}
507
508/* Return 0 if detection is successful, -ENODEV otherwise */
509static int max6639_detect(struct i2c_client *client,
510 struct i2c_board_info *info)
511{
512 struct i2c_adapter *adapter = client->adapter;
513 int dev_id, manu_id;
514
515 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
516 return -ENODEV;
517
518 /* Actual detection via device and manufacturer ID */
519 dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
520 manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
521 if (dev_id != 0x58 || manu_id != 0x4D)
522 return -ENODEV;
523
524 strlcpy(info->type, "max6639", I2C_NAME_SIZE);
525
526 return 0;
527}
528
529static int max6639_probe(struct i2c_client *client,
530 const struct i2c_device_id *id)
531{
532 struct max6639_data *data;
533 int err;
534
535 data = kzalloc(sizeof(struct max6639_data), GFP_KERNEL);
536 if (!data) {
537 err = -ENOMEM;
538 goto exit;
539 }
540
541 i2c_set_clientdata(client, data);
542 mutex_init(&data->update_lock);
543
544 /* Initialize the max6639 chip */
545 err = max6639_init_client(client);
546 if (err < 0)
547 goto error_free;
548
549 /* Register sysfs hooks */
550 err = sysfs_create_group(&client->dev.kobj, &max6639_group);
551 if (err)
552 goto error_free;
553
554 data->hwmon_dev = hwmon_device_register(&client->dev);
555 if (IS_ERR(data->hwmon_dev)) {
556 err = PTR_ERR(data->hwmon_dev);
557 goto error_remove;
558 }
559
560 dev_info(&client->dev, "temperature sensor and fan control found\n");
561
562 return 0;
563
564error_remove:
565 sysfs_remove_group(&client->dev.kobj, &max6639_group);
566error_free:
567 kfree(data);
568exit:
569 return err;
570}
571
572static int max6639_remove(struct i2c_client *client)
573{
574 struct max6639_data *data = i2c_get_clientdata(client);
575
576 hwmon_device_unregister(data->hwmon_dev);
577 sysfs_remove_group(&client->dev.kobj, &max6639_group);
578
579 kfree(data);
580 return 0;
581}
582
583static int max6639_suspend(struct i2c_client *client, pm_message_t mesg)
584{
585 int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
586 if (data < 0)
587 return data;
588
589 return i2c_smbus_write_byte_data(client,
590 MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY);
591}
592
593static int max6639_resume(struct i2c_client *client)
594{
595 int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
596 if (data < 0)
597 return data;
598
599 return i2c_smbus_write_byte_data(client,
600 MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY);
601}
602
603static const struct i2c_device_id max6639_id[] = {
604 {"max6639", 0},
605 { }
606};
607
608MODULE_DEVICE_TABLE(i2c, max6639_id);
609
610static struct i2c_driver max6639_driver = {
611 .class = I2C_CLASS_HWMON,
612 .driver = {
613 .name = "max6639",
614 },
615 .probe = max6639_probe,
616 .remove = max6639_remove,
617 .suspend = max6639_suspend,
618 .resume = max6639_resume,
619 .id_table = max6639_id,
620 .detect = max6639_detect,
621 .address_list = normal_i2c,
622};
623
624static int __init max6639_init(void)
625{
626 return i2c_add_driver(&max6639_driver);
627}
628
629static void __exit max6639_exit(void)
630{
631 i2c_del_driver(&max6639_driver);
632}
633
634MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
635MODULE_DESCRIPTION("max6639 driver");
636MODULE_LICENSE("GPL");
637
638module_init(max6639_init);
639module_exit(max6639_exit);
Linux kernel - Deliverables
This page took 0.046284 seconds and 5 git commands to generate.