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 */
38 static 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
73 static const int rpm_ranges[] = { 2000, 4000, 8000, 16000 };
74
75 #define FAN_FROM_REG(val, rpm_range) ((val) == 0 || (val) == 255 ? \
76 0 : (rpm_ranges[rpm_range] * 30) / (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 */
82 struct 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
max6639_update_device(struct device * dev)105 static 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 }
159 abort:
160 mutex_unlock(&data->update_lock);
161
162 return ret;
163 }
164
show_temp_input(struct device * dev,struct device_attribute * dev_attr,char * buf)165 static 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
show_temp_fault(struct device * dev,struct device_attribute * dev_attr,char * buf)179 static 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
show_temp_max(struct device * dev,struct device_attribute * dev_attr,char * buf)191 static 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
set_temp_max(struct device * dev,struct device_attribute * dev_attr,const char * buf,size_t count)201 static 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 = kstrtoul(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
show_temp_crit(struct device * dev,struct device_attribute * dev_attr,char * buf)224 static 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
set_temp_crit(struct device * dev,struct device_attribute * dev_attr,const char * buf,size_t count)234 static 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 = kstrtoul(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
show_temp_emergency(struct device * dev,struct device_attribute * dev_attr,char * buf)257 static 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
set_temp_emergency(struct device * dev,struct device_attribute * dev_attr,const char * buf,size_t count)268 static 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 = kstrtoul(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
show_pwm(struct device * dev,struct device_attribute * dev_attr,char * buf)291 static 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
set_pwm(struct device * dev,struct device_attribute * dev_attr,const char * buf,size_t count)301 static 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 = kstrtoul(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
show_fan_input(struct device * dev,struct device_attribute * dev_attr,char * buf)326 static 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->rpm_range));
337 }
338
show_alarm(struct device * dev,struct device_attribute * dev_attr,char * buf)339 static 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
351 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
352 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
353 static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
354 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
355 static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max,
356 set_temp_max, 0);
357 static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_temp_max,
358 set_temp_max, 1);
359 static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_temp_crit,
360 set_temp_crit, 0);
361 static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_temp_crit,
362 set_temp_crit, 1);
363 static SENSOR_DEVICE_ATTR(temp1_emergency, S_IWUSR | S_IRUGO,
364 show_temp_emergency, set_temp_emergency, 0);
365 static SENSOR_DEVICE_ATTR(temp2_emergency, S_IWUSR | S_IRUGO,
366 show_temp_emergency, set_temp_emergency, 1);
367 static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 0);
368 static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, set_pwm, 1);
369 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
370 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
371 static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, show_alarm, NULL, 1);
372 static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, show_alarm, NULL, 0);
373 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 3);
374 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 2);
375 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 7);
376 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 6);
377 static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, show_alarm, NULL, 5);
378 static SENSOR_DEVICE_ATTR(temp2_emergency_alarm, S_IRUGO, show_alarm, NULL, 4);
379
380
381 static 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
407 static 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 */
rpm_range_to_reg(int range)415 static 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
max6639_init_client(struct i2c_client * client)427 static 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;
433 int rpm_range = 1; /* default: 4000 RPM */
434 int err;
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
450 if (max6639_info)
451 rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
452 data->rpm_range = rpm_range;
453
454 for (i = 0; i < 2; i++) {
455
456 /* Set Fan pulse per revolution */
457 err = i2c_smbus_write_byte_data(client,
458 MAX6639_REG_FAN_PPR(i),
459 data->ppr << 6);
460 if (err)
461 goto exit;
462
463 /* Fans config PWM, RPM */
464 err = i2c_smbus_write_byte_data(client,
465 MAX6639_REG_FAN_CONFIG1(i),
466 MAX6639_FAN_CONFIG1_PWM | rpm_range);
467 if (err)
468 goto exit;
469
470 /* Fans PWM polarity high by default */
471 if (max6639_info && max6639_info->pwm_polarity == 0)
472 err = i2c_smbus_write_byte_data(client,
473 MAX6639_REG_FAN_CONFIG2a(i), 0x00);
474 else
475 err = i2c_smbus_write_byte_data(client,
476 MAX6639_REG_FAN_CONFIG2a(i), 0x02);
477 if (err)
478 goto exit;
479
480 /*
481 * /THERM full speed enable,
482 * PWM frequency 25kHz, see also GCONFIG below
483 */
484 err = i2c_smbus_write_byte_data(client,
485 MAX6639_REG_FAN_CONFIG3(i),
486 MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
487 if (err)
488 goto exit;
489
490 /* Max. temp. 80C/90C/100C */
491 data->temp_therm[i] = 80;
492 data->temp_alert[i] = 90;
493 data->temp_ot[i] = 100;
494 err = i2c_smbus_write_byte_data(client,
495 MAX6639_REG_THERM_LIMIT(i),
496 data->temp_therm[i]);
497 if (err)
498 goto exit;
499 err = i2c_smbus_write_byte_data(client,
500 MAX6639_REG_ALERT_LIMIT(i),
501 data->temp_alert[i]);
502 if (err)
503 goto exit;
504 err = i2c_smbus_write_byte_data(client,
505 MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
506 if (err)
507 goto exit;
508
509 /* PWM 120/120 (i.e. 100%) */
510 data->pwm[i] = 120;
511 err = i2c_smbus_write_byte_data(client,
512 MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
513 if (err)
514 goto exit;
515 }
516 /* Start monitoring */
517 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
518 MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
519 MAX6639_GCONFIG_PWM_FREQ_HI);
520 exit:
521 return err;
522 }
523
524 /* Return 0 if detection is successful, -ENODEV otherwise */
max6639_detect(struct i2c_client * client,struct i2c_board_info * info)525 static int max6639_detect(struct i2c_client *client,
526 struct i2c_board_info *info)
527 {
528 struct i2c_adapter *adapter = client->adapter;
529 int dev_id, manu_id;
530
531 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
532 return -ENODEV;
533
534 /* Actual detection via device and manufacturer ID */
535 dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
536 manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
537 if (dev_id != 0x58 || manu_id != 0x4D)
538 return -ENODEV;
539
540 strlcpy(info->type, "max6639", I2C_NAME_SIZE);
541
542 return 0;
543 }
544
max6639_probe(struct i2c_client * client,const struct i2c_device_id * id)545 static int max6639_probe(struct i2c_client *client,
546 const struct i2c_device_id *id)
547 {
548 struct max6639_data *data;
549 int err;
550
551 data = kzalloc(sizeof(struct max6639_data), GFP_KERNEL);
552 if (!data) {
553 err = -ENOMEM;
554 goto exit;
555 }
556
557 i2c_set_clientdata(client, data);
558 mutex_init(&data->update_lock);
559
560 /* Initialize the max6639 chip */
561 err = max6639_init_client(client);
562 if (err < 0)
563 goto error_free;
564
565 /* Register sysfs hooks */
566 err = sysfs_create_group(&client->dev.kobj, &max6639_group);
567 if (err)
568 goto error_free;
569
570 data->hwmon_dev = hwmon_device_register(&client->dev);
571 if (IS_ERR(data->hwmon_dev)) {
572 err = PTR_ERR(data->hwmon_dev);
573 goto error_remove;
574 }
575
576 dev_info(&client->dev, "temperature sensor and fan control found\n");
577
578 return 0;
579
580 error_remove:
581 sysfs_remove_group(&client->dev.kobj, &max6639_group);
582 error_free:
583 kfree(data);
584 exit:
585 return err;
586 }
587
max6639_remove(struct i2c_client * client)588 static int max6639_remove(struct i2c_client *client)
589 {
590 struct max6639_data *data = i2c_get_clientdata(client);
591
592 hwmon_device_unregister(data->hwmon_dev);
593 sysfs_remove_group(&client->dev.kobj, &max6639_group);
594
595 kfree(data);
596 return 0;
597 }
598
599 #ifdef CONFIG_PM_SLEEP
max6639_suspend(struct device * dev)600 static int max6639_suspend(struct device *dev)
601 {
602 struct i2c_client *client = to_i2c_client(dev);
603 int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
604 if (data < 0)
605 return data;
606
607 return i2c_smbus_write_byte_data(client,
608 MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY);
609 }
610
max6639_resume(struct device * dev)611 static int max6639_resume(struct device *dev)
612 {
613 struct i2c_client *client = to_i2c_client(dev);
614 int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
615 if (data < 0)
616 return data;
617
618 return i2c_smbus_write_byte_data(client,
619 MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY);
620 }
621 #endif /* CONFIG_PM_SLEEP */
622
623 static const struct i2c_device_id max6639_id[] = {
624 {"max6639", 0},
625 { }
626 };
627
628 MODULE_DEVICE_TABLE(i2c, max6639_id);
629
630 static const struct dev_pm_ops max6639_pm_ops = {
631 SET_SYSTEM_SLEEP_PM_OPS(max6639_suspend, max6639_resume)
632 };
633
634 static struct i2c_driver max6639_driver = {
635 .class = I2C_CLASS_HWMON,
636 .driver = {
637 .name = "max6639",
638 .pm = &max6639_pm_ops,
639 },
640 .probe = max6639_probe,
641 .remove = max6639_remove,
642 .id_table = max6639_id,
643 .detect = max6639_detect,
644 .address_list = normal_i2c,
645 };
646
647 module_i2c_driver(max6639_driver);
648
649 MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
650 MODULE_DESCRIPTION("max6639 driver");
651 MODULE_LICENSE("GPL");
652