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18#include <linux/err.h>
19#include <linux/hwmon.h>
20#include <linux/hwmon-sysfs.h>
21#include <linux/i2c.h>
22#include <linux/init.h>
23#include <linux/jiffies.h>
24#include <linux/module.h>
25#include <linux/slab.h>
26
27
28#define MAX31790_REG_GLOBAL_CONFIG 0x00
29#define MAX31790_REG_FAN_CONFIG(ch) (0x02 + (ch))
30#define MAX31790_REG_FAN_DYNAMICS(ch) (0x08 + (ch))
31#define MAX31790_REG_FAN_FAULT_STATUS2 0x10
32#define MAX31790_REG_FAN_FAULT_STATUS1 0x11
33#define MAX31790_REG_TACH_COUNT(ch) (0x18 + (ch) * 2)
34#define MAX31790_REG_PWM_DUTY_CYCLE(ch) (0x30 + (ch) * 2)
35#define MAX31790_REG_PWMOUT(ch) (0x40 + (ch) * 2)
36#define MAX31790_REG_TARGET_COUNT(ch) (0x50 + (ch) * 2)
37
38
39#define MAX31790_FAN_CFG_RPM_MODE 0x80
40#define MAX31790_FAN_CFG_TACH_INPUT_EN 0x08
41#define MAX31790_FAN_CFG_TACH_INPUT 0x01
42
43
44#define MAX31790_FAN_DYN_SR_SHIFT 5
45#define MAX31790_FAN_DYN_SR_MASK 0xE0
46#define SR_FROM_REG(reg) (((reg) & MAX31790_FAN_DYN_SR_MASK) \
47 >> MAX31790_FAN_DYN_SR_SHIFT)
48
49#define FAN_RPM_MIN 120
50#define FAN_RPM_MAX 7864320
51
52#define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \
53 ((60 * (sr) * 8192) / ((reg) >> 4)) : \
54 FAN_RPM_MAX)
55#define RPM_TO_REG(rpm, sr) ((60 * (sr) * 8192) / ((rpm) * 2))
56
57#define NR_CHANNEL 6
58
59
60
61
62struct max31790_data {
63 struct i2c_client *client;
64 struct mutex update_lock;
65 bool valid;
66 unsigned long last_updated;
67
68
69 u8 fan_config[NR_CHANNEL];
70 u8 fan_dynamics[NR_CHANNEL];
71 u16 fault_status;
72 u16 tach[NR_CHANNEL * 2];
73 u16 pwm[NR_CHANNEL];
74 u16 target_count[NR_CHANNEL];
75};
76
77static struct max31790_data *max31790_update_device(struct device *dev)
78{
79 struct max31790_data *data = dev_get_drvdata(dev);
80 struct i2c_client *client = data->client;
81 struct max31790_data *ret = data;
82 int i;
83 int rv;
84
85 mutex_lock(&data->update_lock);
86
87 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
88 rv = i2c_smbus_read_byte_data(client,
89 MAX31790_REG_FAN_FAULT_STATUS1);
90 if (rv < 0)
91 goto abort;
92 data->fault_status = rv & 0x3F;
93
94 rv = i2c_smbus_read_byte_data(client,
95 MAX31790_REG_FAN_FAULT_STATUS2);
96 if (rv < 0)
97 goto abort;
98 data->fault_status |= (rv & 0x3F) << 6;
99
100 for (i = 0; i < NR_CHANNEL; i++) {
101 rv = i2c_smbus_read_word_swapped(client,
102 MAX31790_REG_TACH_COUNT(i));
103 if (rv < 0)
104 goto abort;
105 data->tach[i] = rv;
106
107 if (data->fan_config[i]
108 & MAX31790_FAN_CFG_TACH_INPUT) {
109 rv = i2c_smbus_read_word_swapped(client,
110 MAX31790_REG_TACH_COUNT(NR_CHANNEL
111 + i));
112 if (rv < 0)
113 goto abort;
114 data->tach[NR_CHANNEL + i] = rv;
115 } else {
116 rv = i2c_smbus_read_word_swapped(client,
117 MAX31790_REG_PWMOUT(i));
118 if (rv < 0)
119 goto abort;
120 data->pwm[i] = rv;
121
122 rv = i2c_smbus_read_word_swapped(client,
123 MAX31790_REG_TARGET_COUNT(i));
124 if (rv < 0)
125 goto abort;
126 data->target_count[i] = rv;
127 }
128 }
129
130 data->last_updated = jiffies;
131 data->valid = true;
132 }
133 goto done;
134
135abort:
136 data->valid = false;
137 ret = ERR_PTR(rv);
138
139done:
140 mutex_unlock(&data->update_lock);
141
142 return ret;
143}
144
145static const u8 tach_period[8] = { 1, 2, 4, 8, 16, 32, 32, 32 };
146
147static u8 get_tach_period(u8 fan_dynamics)
148{
149 return tach_period[SR_FROM_REG(fan_dynamics)];
150}
151
152static u8 bits_for_tach_period(int rpm)
153{
154 u8 bits;
155
156 if (rpm < 500)
157 bits = 0x0;
158 else if (rpm < 1000)
159 bits = 0x1;
160 else if (rpm < 2000)
161 bits = 0x2;
162 else if (rpm < 4000)
163 bits = 0x3;
164 else if (rpm < 8000)
165 bits = 0x4;
166 else
167 bits = 0x5;
168
169 return bits;
170}
171
172static ssize_t get_fan(struct device *dev,
173 struct device_attribute *devattr, char *buf)
174{
175 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
176 struct max31790_data *data = max31790_update_device(dev);
177 int sr, rpm;
178
179 if (IS_ERR(data))
180 return PTR_ERR(data);
181
182 sr = get_tach_period(data->fan_dynamics[attr->index]);
183 rpm = RPM_FROM_REG(data->tach[attr->index], sr);
184
185 return sprintf(buf, "%d\n", rpm);
186}
187
188static ssize_t get_fan_target(struct device *dev,
189 struct device_attribute *devattr, char *buf)
190{
191 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
192 struct max31790_data *data = max31790_update_device(dev);
193 int sr, rpm;
194
195 if (IS_ERR(data))
196 return PTR_ERR(data);
197
198 sr = get_tach_period(data->fan_dynamics[attr->index]);
199 rpm = RPM_FROM_REG(data->target_count[attr->index], sr);
200
201 return sprintf(buf, "%d\n", rpm);
202}
203
204static ssize_t set_fan_target(struct device *dev,
205 struct device_attribute *devattr,
206 const char *buf, size_t count)
207{
208 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
209 struct max31790_data *data = dev_get_drvdata(dev);
210 struct i2c_client *client = data->client;
211 u8 bits;
212 int sr;
213 int target_count;
214 unsigned long rpm;
215 int err;
216
217 err = kstrtoul(buf, 10, &rpm);
218 if (err)
219 return err;
220
221 mutex_lock(&data->update_lock);
222
223 rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
224 bits = bits_for_tach_period(rpm);
225 data->fan_dynamics[attr->index] =
226 ((data->fan_dynamics[attr->index]
227 & ~MAX31790_FAN_DYN_SR_MASK)
228 | (bits << MAX31790_FAN_DYN_SR_SHIFT));
229 err = i2c_smbus_write_byte_data(client,
230 MAX31790_REG_FAN_DYNAMICS(attr->index),
231 data->fan_dynamics[attr->index]);
232
233 if (err < 0) {
234 mutex_unlock(&data->update_lock);
235 return err;
236 }
237
238 sr = get_tach_period(data->fan_dynamics[attr->index]);
239 target_count = RPM_TO_REG(rpm, sr);
240 target_count = clamp_val(target_count, 0x1, 0x7FF);
241
242 data->target_count[attr->index] = target_count << 5;
243
244 err = i2c_smbus_write_word_swapped(client,
245 MAX31790_REG_TARGET_COUNT(attr->index),
246 data->target_count[attr->index]);
247
248 mutex_unlock(&data->update_lock);
249
250 if (err < 0)
251 return err;
252
253 return count;
254}
255
256static ssize_t get_pwm(struct device *dev,
257 struct device_attribute *devattr, char *buf)
258{
259 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
260 struct max31790_data *data = max31790_update_device(dev);
261 int pwm;
262
263 if (IS_ERR(data))
264 return PTR_ERR(data);
265
266 pwm = data->pwm[attr->index] >> 8;
267
268 return sprintf(buf, "%d\n", pwm);
269}
270
271static ssize_t set_pwm(struct device *dev,
272 struct device_attribute *devattr,
273 const char *buf, size_t count)
274{
275 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
276 struct max31790_data *data = dev_get_drvdata(dev);
277 struct i2c_client *client = data->client;
278 unsigned long pwm;
279 int err;
280
281 err = kstrtoul(buf, 10, &pwm);
282 if (err)
283 return err;
284
285 if (pwm > 255)
286 return -EINVAL;
287
288 mutex_lock(&data->update_lock);
289
290 data->pwm[attr->index] = pwm << 8;
291 err = i2c_smbus_write_word_swapped(client,
292 MAX31790_REG_PWMOUT(attr->index),
293 data->pwm[attr->index]);
294
295 mutex_unlock(&data->update_lock);
296
297 if (err < 0)
298 return err;
299
300 return count;
301}
302
303static ssize_t get_pwm_enable(struct device *dev,
304 struct device_attribute *devattr, char *buf)
305{
306 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
307 struct max31790_data *data = max31790_update_device(dev);
308 int mode;
309
310 if (IS_ERR(data))
311 return PTR_ERR(data);
312
313 if (data->fan_config[attr->index] & MAX31790_FAN_CFG_RPM_MODE)
314 mode = 2;
315 else if (data->fan_config[attr->index] & MAX31790_FAN_CFG_TACH_INPUT_EN)
316 mode = 1;
317 else
318 mode = 0;
319
320 return sprintf(buf, "%d\n", mode);
321}
322
323static ssize_t set_pwm_enable(struct device *dev,
324 struct device_attribute *devattr,
325 const char *buf, size_t count)
326{
327 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
328 struct max31790_data *data = dev_get_drvdata(dev);
329 struct i2c_client *client = data->client;
330 unsigned long mode;
331 int err;
332
333 err = kstrtoul(buf, 10, &mode);
334 if (err)
335 return err;
336
337 switch (mode) {
338 case 0:
339 data->fan_config[attr->index] =
340 data->fan_config[attr->index]
341 & ~(MAX31790_FAN_CFG_TACH_INPUT_EN
342 | MAX31790_FAN_CFG_RPM_MODE);
343 break;
344 case 1:
345 data->fan_config[attr->index] =
346 (data->fan_config[attr->index]
347 | MAX31790_FAN_CFG_TACH_INPUT_EN)
348 & ~MAX31790_FAN_CFG_RPM_MODE;
349 break;
350 case 2:
351 data->fan_config[attr->index] =
352 data->fan_config[attr->index]
353 | MAX31790_FAN_CFG_TACH_INPUT_EN
354 | MAX31790_FAN_CFG_RPM_MODE;
355 break;
356 default:
357 return -EINVAL;
358 }
359
360 mutex_lock(&data->update_lock);
361
362 err = i2c_smbus_write_byte_data(client,
363 MAX31790_REG_FAN_CONFIG(attr->index),
364 data->fan_config[attr->index]);
365
366 mutex_unlock(&data->update_lock);
367
368 if (err < 0)
369 return err;
370
371 return count;
372}
373
374static ssize_t get_fan_fault(struct device *dev,
375 struct device_attribute *devattr, char *buf)
376{
377 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
378 struct max31790_data *data = max31790_update_device(dev);
379 int fault;
380
381 if (IS_ERR(data))
382 return PTR_ERR(data);
383
384 fault = !!(data->fault_status & (1 << attr->index));
385
386 return sprintf(buf, "%d\n", fault);
387}
388
389static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan, NULL, 0);
390static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan, NULL, 1);
391static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, get_fan, NULL, 2);
392static SENSOR_DEVICE_ATTR(fan4_input, S_IRUGO, get_fan, NULL, 3);
393static SENSOR_DEVICE_ATTR(fan5_input, S_IRUGO, get_fan, NULL, 4);
394static SENSOR_DEVICE_ATTR(fan6_input, S_IRUGO, get_fan, NULL, 5);
395
396static SENSOR_DEVICE_ATTR(fan1_fault, S_IRUGO, get_fan_fault, NULL, 0);
397static SENSOR_DEVICE_ATTR(fan2_fault, S_IRUGO, get_fan_fault, NULL, 1);
398static SENSOR_DEVICE_ATTR(fan3_fault, S_IRUGO, get_fan_fault, NULL, 2);
399static SENSOR_DEVICE_ATTR(fan4_fault, S_IRUGO, get_fan_fault, NULL, 3);
400static SENSOR_DEVICE_ATTR(fan5_fault, S_IRUGO, get_fan_fault, NULL, 4);
401static SENSOR_DEVICE_ATTR(fan6_fault, S_IRUGO, get_fan_fault, NULL, 5);
402
403static SENSOR_DEVICE_ATTR(fan7_input, S_IRUGO, get_fan, NULL, 6);
404static SENSOR_DEVICE_ATTR(fan8_input, S_IRUGO, get_fan, NULL, 7);
405static SENSOR_DEVICE_ATTR(fan9_input, S_IRUGO, get_fan, NULL, 8);
406static SENSOR_DEVICE_ATTR(fan10_input, S_IRUGO, get_fan, NULL, 9);
407static SENSOR_DEVICE_ATTR(fan11_input, S_IRUGO, get_fan, NULL, 10);
408static SENSOR_DEVICE_ATTR(fan12_input, S_IRUGO, get_fan, NULL, 11);
409
410static SENSOR_DEVICE_ATTR(fan7_fault, S_IRUGO, get_fan_fault, NULL, 6);
411static SENSOR_DEVICE_ATTR(fan8_fault, S_IRUGO, get_fan_fault, NULL, 7);
412static SENSOR_DEVICE_ATTR(fan9_fault, S_IRUGO, get_fan_fault, NULL, 8);
413static SENSOR_DEVICE_ATTR(fan10_fault, S_IRUGO, get_fan_fault, NULL, 9);
414static SENSOR_DEVICE_ATTR(fan11_fault, S_IRUGO, get_fan_fault, NULL, 10);
415static SENSOR_DEVICE_ATTR(fan12_fault, S_IRUGO, get_fan_fault, NULL, 11);
416
417static SENSOR_DEVICE_ATTR(fan1_target, S_IWUSR | S_IRUGO,
418 get_fan_target, set_fan_target, 0);
419static SENSOR_DEVICE_ATTR(fan2_target, S_IWUSR | S_IRUGO,
420 get_fan_target, set_fan_target, 1);
421static SENSOR_DEVICE_ATTR(fan3_target, S_IWUSR | S_IRUGO,
422 get_fan_target, set_fan_target, 2);
423static SENSOR_DEVICE_ATTR(fan4_target, S_IWUSR | S_IRUGO,
424 get_fan_target, set_fan_target, 3);
425static SENSOR_DEVICE_ATTR(fan5_target, S_IWUSR | S_IRUGO,
426 get_fan_target, set_fan_target, 4);
427static SENSOR_DEVICE_ATTR(fan6_target, S_IWUSR | S_IRUGO,
428 get_fan_target, set_fan_target, 5);
429
430static SENSOR_DEVICE_ATTR(pwm1, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 0);
431static SENSOR_DEVICE_ATTR(pwm2, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 1);
432static SENSOR_DEVICE_ATTR(pwm3, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 2);
433static SENSOR_DEVICE_ATTR(pwm4, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 3);
434static SENSOR_DEVICE_ATTR(pwm5, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 4);
435static SENSOR_DEVICE_ATTR(pwm6, S_IWUSR | S_IRUGO, get_pwm, set_pwm, 5);
436
437static SENSOR_DEVICE_ATTR(pwm1_enable, S_IWUSR | S_IRUGO,
438 get_pwm_enable, set_pwm_enable, 0);
439static SENSOR_DEVICE_ATTR(pwm2_enable, S_IWUSR | S_IRUGO,
440 get_pwm_enable, set_pwm_enable, 1);
441static SENSOR_DEVICE_ATTR(pwm3_enable, S_IWUSR | S_IRUGO,
442 get_pwm_enable, set_pwm_enable, 2);
443static SENSOR_DEVICE_ATTR(pwm4_enable, S_IWUSR | S_IRUGO,
444 get_pwm_enable, set_pwm_enable, 3);
445static SENSOR_DEVICE_ATTR(pwm5_enable, S_IWUSR | S_IRUGO,
446 get_pwm_enable, set_pwm_enable, 4);
447static SENSOR_DEVICE_ATTR(pwm6_enable, S_IWUSR | S_IRUGO,
448 get_pwm_enable, set_pwm_enable, 5);
449
450static struct attribute *max31790_attrs[] = {
451 &sensor_dev_attr_fan1_input.dev_attr.attr,
452 &sensor_dev_attr_fan2_input.dev_attr.attr,
453 &sensor_dev_attr_fan3_input.dev_attr.attr,
454 &sensor_dev_attr_fan4_input.dev_attr.attr,
455 &sensor_dev_attr_fan5_input.dev_attr.attr,
456 &sensor_dev_attr_fan6_input.dev_attr.attr,
457
458 &sensor_dev_attr_fan1_fault.dev_attr.attr,
459 &sensor_dev_attr_fan2_fault.dev_attr.attr,
460 &sensor_dev_attr_fan3_fault.dev_attr.attr,
461 &sensor_dev_attr_fan4_fault.dev_attr.attr,
462 &sensor_dev_attr_fan5_fault.dev_attr.attr,
463 &sensor_dev_attr_fan6_fault.dev_attr.attr,
464
465 &sensor_dev_attr_fan7_input.dev_attr.attr,
466 &sensor_dev_attr_fan8_input.dev_attr.attr,
467 &sensor_dev_attr_fan9_input.dev_attr.attr,
468 &sensor_dev_attr_fan10_input.dev_attr.attr,
469 &sensor_dev_attr_fan11_input.dev_attr.attr,
470 &sensor_dev_attr_fan12_input.dev_attr.attr,
471
472 &sensor_dev_attr_fan7_fault.dev_attr.attr,
473 &sensor_dev_attr_fan8_fault.dev_attr.attr,
474 &sensor_dev_attr_fan9_fault.dev_attr.attr,
475 &sensor_dev_attr_fan10_fault.dev_attr.attr,
476 &sensor_dev_attr_fan11_fault.dev_attr.attr,
477 &sensor_dev_attr_fan12_fault.dev_attr.attr,
478
479 &sensor_dev_attr_fan1_target.dev_attr.attr,
480 &sensor_dev_attr_fan2_target.dev_attr.attr,
481 &sensor_dev_attr_fan3_target.dev_attr.attr,
482 &sensor_dev_attr_fan4_target.dev_attr.attr,
483 &sensor_dev_attr_fan5_target.dev_attr.attr,
484 &sensor_dev_attr_fan6_target.dev_attr.attr,
485
486 &sensor_dev_attr_pwm1.dev_attr.attr,
487 &sensor_dev_attr_pwm2.dev_attr.attr,
488 &sensor_dev_attr_pwm3.dev_attr.attr,
489 &sensor_dev_attr_pwm4.dev_attr.attr,
490 &sensor_dev_attr_pwm5.dev_attr.attr,
491 &sensor_dev_attr_pwm6.dev_attr.attr,
492
493 &sensor_dev_attr_pwm1_enable.dev_attr.attr,
494 &sensor_dev_attr_pwm2_enable.dev_attr.attr,
495 &sensor_dev_attr_pwm3_enable.dev_attr.attr,
496 &sensor_dev_attr_pwm4_enable.dev_attr.attr,
497 &sensor_dev_attr_pwm5_enable.dev_attr.attr,
498 &sensor_dev_attr_pwm6_enable.dev_attr.attr,
499 NULL
500};
501
502static umode_t max31790_attrs_visible(struct kobject *kobj,
503 struct attribute *a, int n)
504{
505 struct device *dev = container_of(kobj, struct device, kobj);
506 struct max31790_data *data = dev_get_drvdata(dev);
507 struct device_attribute *devattr =
508 container_of(a, struct device_attribute, attr);
509 int index = to_sensor_dev_attr(devattr)->index % NR_CHANNEL;
510 u8 fan_config;
511
512 fan_config = data->fan_config[index];
513
514 if (n >= NR_CHANNEL * 2 && n < NR_CHANNEL * 4 &&
515 !(fan_config & MAX31790_FAN_CFG_TACH_INPUT))
516 return 0;
517 if (n >= NR_CHANNEL * 4 && (fan_config & MAX31790_FAN_CFG_TACH_INPUT))
518 return 0;
519
520 return a->mode;
521}
522
523static const struct attribute_group max31790_group = {
524 .attrs = max31790_attrs,
525 .is_visible = max31790_attrs_visible,
526};
527__ATTRIBUTE_GROUPS(max31790);
528
529static int max31790_init_client(struct i2c_client *client,
530 struct max31790_data *data)
531{
532 int i, rv;
533
534 for (i = 0; i < NR_CHANNEL; i++) {
535 rv = i2c_smbus_read_byte_data(client,
536 MAX31790_REG_FAN_CONFIG(i));
537 if (rv < 0)
538 return rv;
539 data->fan_config[i] = rv;
540
541 rv = i2c_smbus_read_byte_data(client,
542 MAX31790_REG_FAN_DYNAMICS(i));
543 if (rv < 0)
544 return rv;
545 data->fan_dynamics[i] = rv;
546 }
547
548 return 0;
549}
550
551static int max31790_probe(struct i2c_client *client,
552 const struct i2c_device_id *id)
553{
554 struct i2c_adapter *adapter = client->adapter;
555 struct device *dev = &client->dev;
556 struct max31790_data *data;
557 struct device *hwmon_dev;
558 int err;
559
560 if (!i2c_check_functionality(adapter,
561 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
562 return -ENODEV;
563
564 data = devm_kzalloc(dev, sizeof(struct max31790_data), GFP_KERNEL);
565 if (!data)
566 return -ENOMEM;
567
568 data->client = client;
569 mutex_init(&data->update_lock);
570
571
572
573
574 err = max31790_init_client(client, data);
575 if (err)
576 return err;
577
578 hwmon_dev = devm_hwmon_device_register_with_groups(dev,
579 client->name, data, max31790_groups);
580
581 return PTR_ERR_OR_ZERO(hwmon_dev);
582}
583
584static const struct i2c_device_id max31790_id[] = {
585 { "max31790", 0 },
586 { }
587};
588MODULE_DEVICE_TABLE(i2c, max31790_id);
589
590static struct i2c_driver max31790_driver = {
591 .class = I2C_CLASS_HWMON,
592 .probe = max31790_probe,
593 .driver = {
594 .name = "max31790",
595 },
596 .id_table = max31790_id,
597};
598
599module_i2c_driver(max31790_driver);
600
601MODULE_AUTHOR("Il Han <corone.il.han@gmail.com>");
602MODULE_DESCRIPTION("MAX31790 sensor driver");
603MODULE_LICENSE("GPL");
604
