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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
25static const unsigned short normal_i2c[] = { 0x2c, 0x2e, 0x2f, I2C_CLIENT_END };
26
27
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
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
68
69struct max6639_data {
70 struct i2c_client *client;
71 struct mutex update_lock;
72 char valid;
73 unsigned long last_updated;
74
75
76 u16 temp[2];
77 bool temp_fault[2];
78 u8 fan[2];
79 u8 status;
80
81
82 u8 pwm[2];
83 u8 temp_therm[2];
84 u8 temp_alert[2];
85 u8 temp_ot[2];
86
87
88 u8 ppr;
89 u8 rpm_range;
90};
91
92static struct max6639_data *max6639_update_device(struct device *dev)
93{
94 struct max6639_data *data = dev_get_drvdata(dev);
95 struct i2c_client *client = data->client;
96 struct max6639_data *ret = data;
97 int i;
98 int status_reg;
99
100 mutex_lock(&data->update_lock);
101
102 if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
103 int res;
104
105 dev_dbg(&client->dev, "Starting max6639 update\n");
106
107 status_reg = i2c_smbus_read_byte_data(client,
108 MAX6639_REG_STATUS);
109 if (status_reg < 0) {
110 ret = ERR_PTR(status_reg);
111 goto abort;
112 }
113
114 data->status = status_reg;
115
116 for (i = 0; i < 2; i++) {
117 res = i2c_smbus_read_byte_data(client,
118 MAX6639_REG_FAN_CNT(i));
119 if (res < 0) {
120 ret = ERR_PTR(res);
121 goto abort;
122 }
123 data->fan[i] = res;
124
125 res = i2c_smbus_read_byte_data(client,
126 MAX6639_REG_TEMP_EXT(i));
127 if (res < 0) {
128 ret = ERR_PTR(res);
129 goto abort;
130 }
131 data->temp[i] = res >> 5;
132 data->temp_fault[i] = res & 0x01;
133
134 res = i2c_smbus_read_byte_data(client,
135 MAX6639_REG_TEMP(i));
136 if (res < 0) {
137 ret = ERR_PTR(res);
138 goto abort;
139 }
140 data->temp[i] |= res << 3;
141 }
142
143 data->last_updated = jiffies;
144 data->valid = 1;
145 }
146abort:
147 mutex_unlock(&data->update_lock);
148
149 return ret;
150}
151
152static ssize_t temp_input_show(struct device *dev,
153 struct device_attribute *dev_attr, char *buf)
154{
155 long temp;
156 struct max6639_data *data = max6639_update_device(dev);
157 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
158
159 if (IS_ERR(data))
160 return PTR_ERR(data);
161
162 temp = data->temp[attr->index] * 125;
163 return sprintf(buf, "%ld\n", temp);
164}
165
166static ssize_t temp_fault_show(struct device *dev,
167 struct device_attribute *dev_attr, char *buf)
168{
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 return sprintf(buf, "%d\n", data->temp_fault[attr->index]);
176}
177
178static ssize_t temp_max_show(struct device *dev,
179 struct device_attribute *dev_attr, char *buf)
180{
181 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
182 struct max6639_data *data = dev_get_drvdata(dev);
183
184 return sprintf(buf, "%d\n", (data->temp_therm[attr->index] * 1000));
185}
186
187static ssize_t temp_max_store(struct device *dev,
188 struct device_attribute *dev_attr,
189 const char *buf, size_t count)
190{
191 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
192 struct max6639_data *data = dev_get_drvdata(dev);
193 struct i2c_client *client = data->client;
194 unsigned long val;
195 int res;
196
197 res = kstrtoul(buf, 10, &val);
198 if (res)
199 return res;
200
201 mutex_lock(&data->update_lock);
202 data->temp_therm[attr->index] = TEMP_LIMIT_TO_REG(val);
203 i2c_smbus_write_byte_data(client,
204 MAX6639_REG_THERM_LIMIT(attr->index),
205 data->temp_therm[attr->index]);
206 mutex_unlock(&data->update_lock);
207 return count;
208}
209
210static ssize_t temp_crit_show(struct device *dev,
211 struct device_attribute *dev_attr, char *buf)
212{
213 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
214 struct max6639_data *data = dev_get_drvdata(dev);
215
216 return sprintf(buf, "%d\n", (data->temp_alert[attr->index] * 1000));
217}
218
219static ssize_t temp_crit_store(struct device *dev,
220 struct device_attribute *dev_attr,
221 const char *buf, size_t count)
222{
223 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
224 struct max6639_data *data = dev_get_drvdata(dev);
225 struct i2c_client *client = data->client;
226 unsigned long val;
227 int res;
228
229 res = kstrtoul(buf, 10, &val);
230 if (res)
231 return res;
232
233 mutex_lock(&data->update_lock);
234 data->temp_alert[attr->index] = TEMP_LIMIT_TO_REG(val);
235 i2c_smbus_write_byte_data(client,
236 MAX6639_REG_ALERT_LIMIT(attr->index),
237 data->temp_alert[attr->index]);
238 mutex_unlock(&data->update_lock);
239 return count;
240}
241
242static ssize_t temp_emergency_show(struct device *dev,
243 struct device_attribute *dev_attr,
244 char *buf)
245{
246 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
247 struct max6639_data *data = dev_get_drvdata(dev);
248
249 return sprintf(buf, "%d\n", (data->temp_ot[attr->index] * 1000));
250}
251
252static ssize_t temp_emergency_store(struct device *dev,
253 struct device_attribute *dev_attr,
254 const char *buf, size_t count)
255{
256 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
257 struct max6639_data *data = dev_get_drvdata(dev);
258 struct i2c_client *client = data->client;
259 unsigned long val;
260 int res;
261
262 res = kstrtoul(buf, 10, &val);
263 if (res)
264 return res;
265
266 mutex_lock(&data->update_lock);
267 data->temp_ot[attr->index] = TEMP_LIMIT_TO_REG(val);
268 i2c_smbus_write_byte_data(client,
269 MAX6639_REG_OT_LIMIT(attr->index),
270 data->temp_ot[attr->index]);
271 mutex_unlock(&data->update_lock);
272 return count;
273}
274
275static ssize_t pwm_show(struct device *dev, struct device_attribute *dev_attr,
276 char *buf)
277{
278 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
279 struct max6639_data *data = dev_get_drvdata(dev);
280
281 return sprintf(buf, "%d\n", data->pwm[attr->index] * 255 / 120);
282}
283
284static ssize_t pwm_store(struct device *dev,
285 struct device_attribute *dev_attr, const char *buf,
286 size_t count)
287{
288 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
289 struct max6639_data *data = dev_get_drvdata(dev);
290 struct i2c_client *client = data->client;
291 unsigned long val;
292 int res;
293
294 res = kstrtoul(buf, 10, &val);
295 if (res)
296 return res;
297
298 val = clamp_val(val, 0, 255);
299
300 mutex_lock(&data->update_lock);
301 data->pwm[attr->index] = (u8)(val * 120 / 255);
302 i2c_smbus_write_byte_data(client,
303 MAX6639_REG_TARGTDUTY(attr->index),
304 data->pwm[attr->index]);
305 mutex_unlock(&data->update_lock);
306 return count;
307}
308
309static ssize_t fan_input_show(struct device *dev,
310 struct device_attribute *dev_attr, char *buf)
311{
312 struct max6639_data *data = max6639_update_device(dev);
313 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
314
315 if (IS_ERR(data))
316 return PTR_ERR(data);
317
318 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
319 data->rpm_range));
320}
321
322static ssize_t alarm_show(struct device *dev,
323 struct device_attribute *dev_attr, char *buf)
324{
325 struct max6639_data *data = max6639_update_device(dev);
326 struct sensor_device_attribute *attr = to_sensor_dev_attr(dev_attr);
327
328 if (IS_ERR(data))
329 return PTR_ERR(data);
330
331 return sprintf(buf, "%d\n", !!(data->status & (1 << attr->index)));
332}
333
334static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
335static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
336static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
337static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
338static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
339static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
340static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp_crit, 0);
341static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp_crit, 1);
342static SENSOR_DEVICE_ATTR_RW(temp1_emergency, temp_emergency, 0);
343static SENSOR_DEVICE_ATTR_RW(temp2_emergency, temp_emergency, 1);
344static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
345static SENSOR_DEVICE_ATTR_RW(pwm2, pwm, 1);
346static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
347static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
348static SENSOR_DEVICE_ATTR_RO(fan1_fault, alarm, 1);
349static SENSOR_DEVICE_ATTR_RO(fan2_fault, alarm, 0);
350static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 3);
351static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 2);
352static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 7);
353static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 6);
354static SENSOR_DEVICE_ATTR_RO(temp1_emergency_alarm, alarm, 5);
355static SENSOR_DEVICE_ATTR_RO(temp2_emergency_alarm, alarm, 4);
356
357
358static struct attribute *max6639_attrs[] = {
359 &sensor_dev_attr_temp1_input.dev_attr.attr,
360 &sensor_dev_attr_temp2_input.dev_attr.attr,
361 &sensor_dev_attr_temp1_fault.dev_attr.attr,
362 &sensor_dev_attr_temp2_fault.dev_attr.attr,
363 &sensor_dev_attr_temp1_max.dev_attr.attr,
364 &sensor_dev_attr_temp2_max.dev_attr.attr,
365 &sensor_dev_attr_temp1_crit.dev_attr.attr,
366 &sensor_dev_attr_temp2_crit.dev_attr.attr,
367 &sensor_dev_attr_temp1_emergency.dev_attr.attr,
368 &sensor_dev_attr_temp2_emergency.dev_attr.attr,
369 &sensor_dev_attr_pwm1.dev_attr.attr,
370 &sensor_dev_attr_pwm2.dev_attr.attr,
371 &sensor_dev_attr_fan1_input.dev_attr.attr,
372 &sensor_dev_attr_fan2_input.dev_attr.attr,
373 &sensor_dev_attr_fan1_fault.dev_attr.attr,
374 &sensor_dev_attr_fan2_fault.dev_attr.attr,
375 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
376 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
377 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
378 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
379 &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr,
380 &sensor_dev_attr_temp2_emergency_alarm.dev_attr.attr,
381 NULL
382};
383ATTRIBUTE_GROUPS(max6639);
384
385
386
387
388
389static int rpm_range_to_reg(int range)
390{
391 int i;
392
393 for (i = 0; i < ARRAY_SIZE(rpm_ranges); i++) {
394 if (rpm_ranges[i] == range)
395 return i;
396 }
397
398 return 1;
399}
400
401static int max6639_init_client(struct i2c_client *client,
402 struct max6639_data *data)
403{
404 struct max6639_platform_data *max6639_info =
405 dev_get_platdata(&client->dev);
406 int i;
407 int rpm_range = 1;
408 int err;
409
410
411 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
412 MAX6639_GCONFIG_POR);
413 if (err)
414 goto exit;
415
416
417 if (max6639_info && max6639_info->ppr > 0 &&
418 max6639_info->ppr < 5)
419 data->ppr = max6639_info->ppr;
420 else
421 data->ppr = 2;
422 data->ppr -= 1;
423
424 if (max6639_info)
425 rpm_range = rpm_range_to_reg(max6639_info->rpm_range);
426 data->rpm_range = rpm_range;
427
428 for (i = 0; i < 2; i++) {
429
430
431 err = i2c_smbus_write_byte_data(client,
432 MAX6639_REG_FAN_PPR(i),
433 data->ppr << 6);
434 if (err)
435 goto exit;
436
437
438 err = i2c_smbus_write_byte_data(client,
439 MAX6639_REG_FAN_CONFIG1(i),
440 MAX6639_FAN_CONFIG1_PWM | rpm_range);
441 if (err)
442 goto exit;
443
444
445 if (max6639_info && max6639_info->pwm_polarity == 0)
446 err = i2c_smbus_write_byte_data(client,
447 MAX6639_REG_FAN_CONFIG2a(i), 0x00);
448 else
449 err = i2c_smbus_write_byte_data(client,
450 MAX6639_REG_FAN_CONFIG2a(i), 0x02);
451 if (err)
452 goto exit;
453
454
455
456
457
458 err = i2c_smbus_write_byte_data(client,
459 MAX6639_REG_FAN_CONFIG3(i),
460 MAX6639_FAN_CONFIG3_THERM_FULL_SPEED | 0x03);
461 if (err)
462 goto exit;
463
464
465 data->temp_therm[i] = 80;
466 data->temp_alert[i] = 90;
467 data->temp_ot[i] = 100;
468 err = i2c_smbus_write_byte_data(client,
469 MAX6639_REG_THERM_LIMIT(i),
470 data->temp_therm[i]);
471 if (err)
472 goto exit;
473 err = i2c_smbus_write_byte_data(client,
474 MAX6639_REG_ALERT_LIMIT(i),
475 data->temp_alert[i]);
476 if (err)
477 goto exit;
478 err = i2c_smbus_write_byte_data(client,
479 MAX6639_REG_OT_LIMIT(i), data->temp_ot[i]);
480 if (err)
481 goto exit;
482
483
484 data->pwm[i] = 120;
485 err = i2c_smbus_write_byte_data(client,
486 MAX6639_REG_TARGTDUTY(i), data->pwm[i]);
487 if (err)
488 goto exit;
489 }
490
491 err = i2c_smbus_write_byte_data(client, MAX6639_REG_GCONFIG,
492 MAX6639_GCONFIG_DISABLE_TIMEOUT | MAX6639_GCONFIG_CH2_LOCAL |
493 MAX6639_GCONFIG_PWM_FREQ_HI);
494exit:
495 return err;
496}
497
498
499static int max6639_detect(struct i2c_client *client,
500 struct i2c_board_info *info)
501{
502 struct i2c_adapter *adapter = client->adapter;
503 int dev_id, manu_id;
504
505 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
506 return -ENODEV;
507
508
509 dev_id = i2c_smbus_read_byte_data(client, MAX6639_REG_DEVID);
510 manu_id = i2c_smbus_read_byte_data(client, MAX6639_REG_MANUID);
511 if (dev_id != 0x58 || manu_id != 0x4D)
512 return -ENODEV;
513
514 strlcpy(info->type, "max6639", I2C_NAME_SIZE);
515
516 return 0;
517}
518
519static int max6639_probe(struct i2c_client *client)
520{
521 struct device *dev = &client->dev;
522 struct max6639_data *data;
523 struct device *hwmon_dev;
524 int err;
525
526 data = devm_kzalloc(dev, sizeof(struct max6639_data), GFP_KERNEL);
527 if (!data)
528 return -ENOMEM;
529
530 data->client = client;
531 mutex_init(&data->update_lock);
532
533
534 err = max6639_init_client(client, data);
535 if (err < 0)
536 return err;
537
538 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
539 data,
540 max6639_groups);
541 return PTR_ERR_OR_ZERO(hwmon_dev);
542}
543
544#ifdef CONFIG_PM_SLEEP
545static int max6639_suspend(struct device *dev)
546{
547 struct i2c_client *client = to_i2c_client(dev);
548 int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
549 if (data < 0)
550 return data;
551
552 return i2c_smbus_write_byte_data(client,
553 MAX6639_REG_GCONFIG, data | MAX6639_GCONFIG_STANDBY);
554}
555
556static int max6639_resume(struct device *dev)
557{
558 struct i2c_client *client = to_i2c_client(dev);
559 int data = i2c_smbus_read_byte_data(client, MAX6639_REG_GCONFIG);
560 if (data < 0)
561 return data;
562
563 return i2c_smbus_write_byte_data(client,
564 MAX6639_REG_GCONFIG, data & ~MAX6639_GCONFIG_STANDBY);
565}
566#endif
567
568static const struct i2c_device_id max6639_id[] = {
569 {"max6639", 0},
570 { }
571};
572
573MODULE_DEVICE_TABLE(i2c, max6639_id);
574
575static SIMPLE_DEV_PM_OPS(max6639_pm_ops, max6639_suspend, max6639_resume);
576
577static struct i2c_driver max6639_driver = {
578 .class = I2C_CLASS_HWMON,
579 .driver = {
580 .name = "max6639",
581 .pm = &max6639_pm_ops,
582 },
583 .probe_new = max6639_probe,
584 .id_table = max6639_id,
585 .detect = max6639_detect,
586 .address_list = normal_i2c,
587};
588
589module_i2c_driver(max6639_driver);
590
591MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
592MODULE_DESCRIPTION("max6639 driver");
593MODULE_LICENSE("GPL");
594
