1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * max6650.c - Part of lm_sensors, Linux kernel modules for hardware
4 * monitoring.
5 *
6 * (C) 2007 by Hans J. Koch <hjk@hansjkoch.de>
7 *
8 * based on code written by John Morris <john.morris@spirentcom.com>
9 * Copyright (c) 2003 Spirent Communications
10 * and Claus Gindhart <claus.gindhart@kontron.com>
11 *
12 * This module has only been tested with the MAX6650 chip. It should
13 * also work with the MAX6651. It does not distinguish max6650 and max6651
14 * chips.
15 *
16 * The datasheet was last seen at:
17 *
18 * http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
19 */
20
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/slab.h>
24 #include <linux/jiffies.h>
25 #include <linux/i2c.h>
26 #include <linux/hwmon.h>
27 #include <linux/hwmon-sysfs.h>
28 #include <linux/err.h>
29 #include <linux/of_device.h>
30 #include <linux/thermal.h>
31
32 /*
33 * Insmod parameters
34 */
35
36 /* fan_voltage: 5=5V fan, 12=12V fan, 0=don't change */
37 static int fan_voltage;
38 /* prescaler: Possible values are 1, 2, 4, 8, 16 or 0 for don't change */
39 static int prescaler;
40 /* clock: The clock frequency of the chip (max6651 can be clocked externally) */
41 static int clock = 254000;
42
43 module_param(fan_voltage, int, 0444);
44 module_param(prescaler, int, 0444);
45 module_param(clock, int, 0444);
46
47 /*
48 * MAX 6650/6651 registers
49 */
50
51 #define MAX6650_REG_SPEED 0x00
52 #define MAX6650_REG_CONFIG 0x02
53 #define MAX6650_REG_GPIO_DEF 0x04
54 #define MAX6650_REG_DAC 0x06
55 #define MAX6650_REG_ALARM_EN 0x08
56 #define MAX6650_REG_ALARM 0x0A
57 #define MAX6650_REG_TACH0 0x0C
58 #define MAX6650_REG_TACH1 0x0E
59 #define MAX6650_REG_TACH2 0x10
60 #define MAX6650_REG_TACH3 0x12
61 #define MAX6650_REG_GPIO_STAT 0x14
62 #define MAX6650_REG_COUNT 0x16
63
64 /*
65 * Config register bits
66 */
67
68 #define MAX6650_CFG_V12 0x08
69 #define MAX6650_CFG_PRESCALER_MASK 0x07
70 #define MAX6650_CFG_PRESCALER_2 0x01
71 #define MAX6650_CFG_PRESCALER_4 0x02
72 #define MAX6650_CFG_PRESCALER_8 0x03
73 #define MAX6650_CFG_PRESCALER_16 0x04
74 #define MAX6650_CFG_MODE_MASK 0x30
75 #define MAX6650_CFG_MODE_ON 0x00
76 #define MAX6650_CFG_MODE_OFF 0x10
77 #define MAX6650_CFG_MODE_CLOSED_LOOP 0x20
78 #define MAX6650_CFG_MODE_OPEN_LOOP 0x30
79 #define MAX6650_COUNT_MASK 0x03
80
81 /*
82 * Alarm status register bits
83 */
84
85 #define MAX6650_ALRM_MAX 0x01
86 #define MAX6650_ALRM_MIN 0x02
87 #define MAX6650_ALRM_TACH 0x04
88 #define MAX6650_ALRM_GPIO1 0x08
89 #define MAX6650_ALRM_GPIO2 0x10
90
91 /* Minimum and maximum values of the FAN-RPM */
92 #define FAN_RPM_MIN 240
93 #define FAN_RPM_MAX 30000
94
95 #define DIV_FROM_REG(reg) (1 << ((reg) & 7))
96 #define DAC_LIMIT(v12) ((v12) ? 180 : 76)
97
98 /*
99 * Client data (each client gets its own)
100 */
101
102 struct max6650_data {
103 struct i2c_client *client;
104 struct mutex update_lock; /* protect alarm register updates */
105 int nr_fans;
106 bool valid; /* false until following fields are valid */
107 unsigned long last_updated; /* in jiffies */
108
109 /* register values */
110 u8 speed;
111 u8 config;
112 u8 tach[4];
113 u8 count;
114 u8 dac;
115 u8 alarm;
116 u8 alarm_en;
117 unsigned long cooling_dev_state;
118 };
119
120 static const u8 tach_reg[] = {
121 MAX6650_REG_TACH0,
122 MAX6650_REG_TACH1,
123 MAX6650_REG_TACH2,
124 MAX6650_REG_TACH3,
125 };
126
127 static const struct of_device_id __maybe_unused max6650_dt_match[] = {
128 {
129 .compatible = "maxim,max6650",
130 .data = (void *)1
131 },
132 {
133 .compatible = "maxim,max6651",
134 .data = (void *)4
135 },
136 { },
137 };
138 MODULE_DEVICE_TABLE(of, max6650_dt_match);
139
dac_to_pwm(int dac,bool v12)140 static int dac_to_pwm(int dac, bool v12)
141 {
142 /*
143 * Useful range for dac is 0-180 for 12V fans and 0-76 for 5V fans.
144 * Lower DAC values mean higher speeds.
145 */
146 return clamp_val(255 - (255 * dac) / DAC_LIMIT(v12), 0, 255);
147 }
148
pwm_to_dac(unsigned int pwm,bool v12)149 static u8 pwm_to_dac(unsigned int pwm, bool v12)
150 {
151 int limit = DAC_LIMIT(v12);
152
153 return limit - (limit * pwm) / 255;
154 }
155
max6650_update_device(struct device * dev)156 static struct max6650_data *max6650_update_device(struct device *dev)
157 {
158 struct max6650_data *data = dev_get_drvdata(dev);
159 struct i2c_client *client = data->client;
160 int reg, err = 0;
161 int i;
162
163 mutex_lock(&data->update_lock);
164
165 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
166 for (i = 0; i < data->nr_fans; i++) {
167 reg = i2c_smbus_read_byte_data(client, tach_reg[i]);
168 if (reg < 0) {
169 err = reg;
170 goto error;
171 }
172 data->tach[i] = reg;
173 }
174
175 /*
176 * Alarms are cleared on read in case the condition that
177 * caused the alarm is removed. Keep the value latched here
178 * for providing the register through different alarm files.
179 */
180 reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM);
181 if (reg < 0) {
182 err = reg;
183 goto error;
184 }
185 data->alarm |= reg;
186 data->last_updated = jiffies;
187 data->valid = true;
188 }
189
190 error:
191 mutex_unlock(&data->update_lock);
192 if (err)
193 data = ERR_PTR(err);
194 return data;
195 }
196
197 /*
198 * Change the operating mode of the chip (if needed).
199 * mode is one of the MAX6650_CFG_MODE_* values.
200 */
max6650_set_operating_mode(struct max6650_data * data,u8 mode)201 static int max6650_set_operating_mode(struct max6650_data *data, u8 mode)
202 {
203 int result;
204 u8 config = data->config;
205
206 if (mode == (config & MAX6650_CFG_MODE_MASK))
207 return 0;
208
209 config = (config & ~MAX6650_CFG_MODE_MASK) | mode;
210
211 result = i2c_smbus_write_byte_data(data->client, MAX6650_REG_CONFIG,
212 config);
213 if (result < 0)
214 return result;
215
216 data->config = config;
217
218 return 0;
219 }
220
221 /*
222 * Set the fan speed to the specified RPM (or read back the RPM setting).
223 * This works in closed loop mode only. Use pwm1 for open loop speed setting.
224 *
225 * The MAX6650/1 will automatically control fan speed when in closed loop
226 * mode.
227 *
228 * Assumptions:
229 *
230 * 1) The MAX6650/1 internal 254kHz clock frequency is set correctly. Use
231 * the clock module parameter if you need to fine tune this.
232 *
233 * 2) The prescaler (low three bits of the config register) has already
234 * been set to an appropriate value. Use the prescaler module parameter
235 * if your BIOS doesn't initialize the chip properly.
236 *
237 * The relevant equations are given on pages 21 and 22 of the datasheet.
238 *
239 * From the datasheet, the relevant equation when in regulation is:
240 *
241 * [fCLK / (128 x (KTACH + 1))] = 2 x FanSpeed / KSCALE
242 *
243 * where:
244 *
245 * fCLK is the oscillator frequency (either the 254kHz internal
246 * oscillator or the externally applied clock)
247 *
248 * KTACH is the value in the speed register
249 *
250 * FanSpeed is the speed of the fan in rps
251 *
252 * KSCALE is the prescaler value (1, 2, 4, 8, or 16)
253 *
254 * When reading, we need to solve for FanSpeed. When writing, we need to
255 * solve for KTACH.
256 *
257 * Note: this tachometer is completely separate from the tachometers
258 * used to measure the fan speeds. Only one fan's speed (fan1) is
259 * controlled.
260 */
261
max6650_set_target(struct max6650_data * data,unsigned long rpm)262 static int max6650_set_target(struct max6650_data *data, unsigned long rpm)
263 {
264 int kscale, ktach;
265
266 if (rpm == 0)
267 return max6650_set_operating_mode(data, MAX6650_CFG_MODE_OFF);
268
269 rpm = clamp_val(rpm, FAN_RPM_MIN, FAN_RPM_MAX);
270
271 /*
272 * Divide the required speed by 60 to get from rpm to rps, then
273 * use the datasheet equation:
274 *
275 * KTACH = [(fCLK x KSCALE) / (256 x FanSpeed)] - 1
276 */
277
278 kscale = DIV_FROM_REG(data->config);
279 ktach = ((clock * kscale) / (256 * rpm / 60)) - 1;
280 if (ktach < 0)
281 ktach = 0;
282 if (ktach > 255)
283 ktach = 255;
284 data->speed = ktach;
285
286 return i2c_smbus_write_byte_data(data->client, MAX6650_REG_SPEED,
287 data->speed);
288 }
289
290 /*
291 * Get gpio alarm status:
292 * Possible values:
293 * 0 = no alarm
294 * 1 = alarm
295 */
296
alarm_show(struct device * dev,struct device_attribute * devattr,char * buf)297 static ssize_t alarm_show(struct device *dev,
298 struct device_attribute *devattr, char *buf)
299 {
300 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
301 struct max6650_data *data = max6650_update_device(dev);
302 bool alarm;
303
304 if (IS_ERR(data))
305 return PTR_ERR(data);
306
307 alarm = data->alarm & attr->index;
308 if (alarm) {
309 mutex_lock(&data->update_lock);
310 data->alarm &= ~attr->index;
311 data->valid = false;
312 mutex_unlock(&data->update_lock);
313 }
314
315 return sprintf(buf, "%d\n", alarm);
316 }
317
318 static SENSOR_DEVICE_ATTR_RO(gpio1_alarm, alarm, MAX6650_ALRM_GPIO1);
319 static SENSOR_DEVICE_ATTR_RO(gpio2_alarm, alarm, MAX6650_ALRM_GPIO2);
320
max6650_attrs_visible(struct kobject * kobj,struct attribute * a,int n)321 static umode_t max6650_attrs_visible(struct kobject *kobj, struct attribute *a,
322 int n)
323 {
324 struct device *dev = kobj_to_dev(kobj);
325 struct max6650_data *data = dev_get_drvdata(dev);
326 struct device_attribute *devattr;
327
328 /*
329 * Hide the alarms that have not been enabled by the firmware
330 */
331
332 devattr = container_of(a, struct device_attribute, attr);
333 if (devattr == &sensor_dev_attr_gpio1_alarm.dev_attr ||
334 devattr == &sensor_dev_attr_gpio2_alarm.dev_attr) {
335 if (!(data->alarm_en & to_sensor_dev_attr(devattr)->index))
336 return 0;
337 }
338
339 return a->mode;
340 }
341
342 static struct attribute *max6650_attrs[] = {
343 &sensor_dev_attr_gpio1_alarm.dev_attr.attr,
344 &sensor_dev_attr_gpio2_alarm.dev_attr.attr,
345 NULL
346 };
347
348 static const struct attribute_group max6650_group = {
349 .attrs = max6650_attrs,
350 .is_visible = max6650_attrs_visible,
351 };
352
353 static const struct attribute_group *max6650_groups[] = {
354 &max6650_group,
355 NULL
356 };
357
max6650_init_client(struct max6650_data * data,struct i2c_client * client)358 static int max6650_init_client(struct max6650_data *data,
359 struct i2c_client *client)
360 {
361 struct device *dev = &client->dev;
362 int reg;
363 int err;
364 u32 voltage;
365 u32 prescale;
366 u32 target_rpm;
367
368 if (of_property_read_u32(dev->of_node, "maxim,fan-microvolt",
369 &voltage))
370 voltage = fan_voltage;
371 else
372 voltage /= 1000000; /* Microvolts to volts */
373 if (of_property_read_u32(dev->of_node, "maxim,fan-prescale",
374 &prescale))
375 prescale = prescaler;
376
377 reg = i2c_smbus_read_byte_data(client, MAX6650_REG_CONFIG);
378 if (reg < 0) {
379 dev_err(dev, "Error reading config register, aborting.\n");
380 return reg;
381 }
382
383 switch (voltage) {
384 case 0:
385 break;
386 case 5:
387 reg &= ~MAX6650_CFG_V12;
388 break;
389 case 12:
390 reg |= MAX6650_CFG_V12;
391 break;
392 default:
393 dev_err(dev, "illegal value for fan_voltage (%d)\n", voltage);
394 }
395
396 switch (prescale) {
397 case 0:
398 break;
399 case 1:
400 reg &= ~MAX6650_CFG_PRESCALER_MASK;
401 break;
402 case 2:
403 reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
404 | MAX6650_CFG_PRESCALER_2;
405 break;
406 case 4:
407 reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
408 | MAX6650_CFG_PRESCALER_4;
409 break;
410 case 8:
411 reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
412 | MAX6650_CFG_PRESCALER_8;
413 break;
414 case 16:
415 reg = (reg & ~MAX6650_CFG_PRESCALER_MASK)
416 | MAX6650_CFG_PRESCALER_16;
417 break;
418 default:
419 dev_err(dev, "illegal value for prescaler (%d)\n", prescale);
420 }
421
422 dev_info(dev, "Fan voltage: %dV, prescaler: %d.\n",
423 (reg & MAX6650_CFG_V12) ? 12 : 5,
424 1 << (reg & MAX6650_CFG_PRESCALER_MASK));
425
426 err = i2c_smbus_write_byte_data(client, MAX6650_REG_CONFIG, reg);
427 if (err) {
428 dev_err(dev, "Config write error, aborting.\n");
429 return err;
430 }
431 data->config = reg;
432
433 reg = i2c_smbus_read_byte_data(client, MAX6650_REG_SPEED);
434 if (reg < 0) {
435 dev_err(dev, "Failed to read speed register, aborting.\n");
436 return reg;
437 }
438 data->speed = reg;
439
440 reg = i2c_smbus_read_byte_data(client, MAX6650_REG_DAC);
441 if (reg < 0) {
442 dev_err(dev, "Failed to read DAC register, aborting.\n");
443 return reg;
444 }
445 data->dac = reg;
446
447 reg = i2c_smbus_read_byte_data(client, MAX6650_REG_COUNT);
448 if (reg < 0) {
449 dev_err(dev, "Failed to read count register, aborting.\n");
450 return reg;
451 }
452 data->count = reg;
453
454 reg = i2c_smbus_read_byte_data(client, MAX6650_REG_ALARM_EN);
455 if (reg < 0) {
456 dev_err(dev, "Failed to read alarm configuration, aborting.\n");
457 return reg;
458 }
459 data->alarm_en = reg;
460
461 if (!of_property_read_u32(client->dev.of_node, "maxim,fan-target-rpm",
462 &target_rpm)) {
463 max6650_set_target(data, target_rpm);
464 max6650_set_operating_mode(data, MAX6650_CFG_MODE_CLOSED_LOOP);
465 }
466
467 return 0;
468 }
469
max6650_get_max_state(struct thermal_cooling_device * cdev,unsigned long * state)470 static int max6650_get_max_state(struct thermal_cooling_device *cdev,
471 unsigned long *state)
472 {
473 *state = 255;
474
475 return 0;
476 }
477
max6650_get_cur_state(struct thermal_cooling_device * cdev,unsigned long * state)478 static int max6650_get_cur_state(struct thermal_cooling_device *cdev,
479 unsigned long *state)
480 {
481 struct max6650_data *data = cdev->devdata;
482
483 *state = data->cooling_dev_state;
484
485 return 0;
486 }
487
max6650_set_cur_state(struct thermal_cooling_device * cdev,unsigned long state)488 static int max6650_set_cur_state(struct thermal_cooling_device *cdev,
489 unsigned long state)
490 {
491 struct max6650_data *data = cdev->devdata;
492 struct i2c_client *client = data->client;
493 int err;
494
495 state = clamp_val(state, 0, 255);
496
497 mutex_lock(&data->update_lock);
498
499 data->dac = pwm_to_dac(state, data->config & MAX6650_CFG_V12);
500 err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);
501 if (!err) {
502 max6650_set_operating_mode(data, state ?
503 MAX6650_CFG_MODE_OPEN_LOOP :
504 MAX6650_CFG_MODE_OFF);
505 data->cooling_dev_state = state;
506 }
507
508 mutex_unlock(&data->update_lock);
509
510 return err;
511 }
512
513 static const struct thermal_cooling_device_ops max6650_cooling_ops = {
514 .get_max_state = max6650_get_max_state,
515 .get_cur_state = max6650_get_cur_state,
516 .set_cur_state = max6650_set_cur_state,
517 };
518
max6650_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * val)519 static int max6650_read(struct device *dev, enum hwmon_sensor_types type,
520 u32 attr, int channel, long *val)
521 {
522 struct max6650_data *data = max6650_update_device(dev);
523 int mode;
524
525 if (IS_ERR(data))
526 return PTR_ERR(data);
527
528 switch (type) {
529 case hwmon_pwm:
530 switch (attr) {
531 case hwmon_pwm_input:
532 *val = dac_to_pwm(data->dac,
533 data->config & MAX6650_CFG_V12);
534 break;
535 case hwmon_pwm_enable:
536 /*
537 * Possible values:
538 * 0 = Fan always on
539 * 1 = Open loop, Voltage is set according to speed,
540 * not regulated.
541 * 2 = Closed loop, RPM for all fans regulated by fan1
542 * tachometer
543 * 3 = Fan off
544 */
545 mode = (data->config & MAX6650_CFG_MODE_MASK) >> 4;
546 *val = (4 - mode) & 3; /* {0 1 2 3} -> {0 3 2 1} */
547 break;
548 default:
549 return -EOPNOTSUPP;
550 }
551 break;
552 case hwmon_fan:
553 switch (attr) {
554 case hwmon_fan_input:
555 /*
556 * Calculation details:
557 *
558 * Each tachometer counts over an interval given by the
559 * "count" register (0.25, 0.5, 1 or 2 seconds).
560 * The driver assumes that the fans produce two pulses
561 * per revolution (this seems to be the most common).
562 */
563 *val = DIV_ROUND_CLOSEST(data->tach[channel] * 120,
564 DIV_FROM_REG(data->count));
565 break;
566 case hwmon_fan_div:
567 *val = DIV_FROM_REG(data->count);
568 break;
569 case hwmon_fan_target:
570 /*
571 * Use the datasheet equation:
572 * FanSpeed = KSCALE x fCLK / [256 x (KTACH + 1)]
573 * then multiply by 60 to give rpm.
574 */
575 *val = 60 * DIV_FROM_REG(data->config) * clock /
576 (256 * (data->speed + 1));
577 break;
578 case hwmon_fan_min_alarm:
579 *val = !!(data->alarm & MAX6650_ALRM_MIN);
580 data->alarm &= ~MAX6650_ALRM_MIN;
581 data->valid = false;
582 break;
583 case hwmon_fan_max_alarm:
584 *val = !!(data->alarm & MAX6650_ALRM_MAX);
585 data->alarm &= ~MAX6650_ALRM_MAX;
586 data->valid = false;
587 break;
588 case hwmon_fan_fault:
589 *val = !!(data->alarm & MAX6650_ALRM_TACH);
590 data->alarm &= ~MAX6650_ALRM_TACH;
591 data->valid = false;
592 break;
593 default:
594 return -EOPNOTSUPP;
595 }
596 break;
597 default:
598 return -EOPNOTSUPP;
599 }
600 return 0;
601 }
602
603 static const u8 max6650_pwm_modes[] = {
604 MAX6650_CFG_MODE_ON,
605 MAX6650_CFG_MODE_OPEN_LOOP,
606 MAX6650_CFG_MODE_CLOSED_LOOP,
607 MAX6650_CFG_MODE_OFF,
608 };
609
max6650_write(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long val)610 static int max6650_write(struct device *dev, enum hwmon_sensor_types type,
611 u32 attr, int channel, long val)
612 {
613 struct max6650_data *data = dev_get_drvdata(dev);
614 int ret = 0;
615 u8 reg;
616
617 mutex_lock(&data->update_lock);
618
619 switch (type) {
620 case hwmon_pwm:
621 switch (attr) {
622 case hwmon_pwm_input:
623 reg = pwm_to_dac(clamp_val(val, 0, 255),
624 data->config & MAX6650_CFG_V12);
625 ret = i2c_smbus_write_byte_data(data->client,
626 MAX6650_REG_DAC, reg);
627 if (ret)
628 break;
629 data->dac = reg;
630 break;
631 case hwmon_pwm_enable:
632 if (val < 0 || val >= ARRAY_SIZE(max6650_pwm_modes)) {
633 ret = -EINVAL;
634 break;
635 }
636 ret = max6650_set_operating_mode(data,
637 max6650_pwm_modes[val]);
638 break;
639 default:
640 ret = -EOPNOTSUPP;
641 break;
642 }
643 break;
644 case hwmon_fan:
645 switch (attr) {
646 case hwmon_fan_div:
647 switch (val) {
648 case 1:
649 reg = 0;
650 break;
651 case 2:
652 reg = 1;
653 break;
654 case 4:
655 reg = 2;
656 break;
657 case 8:
658 reg = 3;
659 break;
660 default:
661 ret = -EINVAL;
662 goto error;
663 }
664 ret = i2c_smbus_write_byte_data(data->client,
665 MAX6650_REG_COUNT, reg);
666 if (ret)
667 break;
668 data->count = reg;
669 break;
670 case hwmon_fan_target:
671 if (val < 0) {
672 ret = -EINVAL;
673 break;
674 }
675 ret = max6650_set_target(data, val);
676 break;
677 default:
678 ret = -EOPNOTSUPP;
679 break;
680 }
681 break;
682 default:
683 ret = -EOPNOTSUPP;
684 break;
685 }
686
687 error:
688 mutex_unlock(&data->update_lock);
689 return ret;
690 }
691
max6650_is_visible(const void * _data,enum hwmon_sensor_types type,u32 attr,int channel)692 static umode_t max6650_is_visible(const void *_data,
693 enum hwmon_sensor_types type, u32 attr,
694 int channel)
695 {
696 const struct max6650_data *data = _data;
697
698 if (channel && (channel >= data->nr_fans || type != hwmon_fan))
699 return 0;
700
701 switch (type) {
702 case hwmon_fan:
703 switch (attr) {
704 case hwmon_fan_input:
705 return 0444;
706 case hwmon_fan_target:
707 case hwmon_fan_div:
708 return 0644;
709 case hwmon_fan_min_alarm:
710 if (data->alarm_en & MAX6650_ALRM_MIN)
711 return 0444;
712 break;
713 case hwmon_fan_max_alarm:
714 if (data->alarm_en & MAX6650_ALRM_MAX)
715 return 0444;
716 break;
717 case hwmon_fan_fault:
718 if (data->alarm_en & MAX6650_ALRM_TACH)
719 return 0444;
720 break;
721 default:
722 break;
723 }
724 break;
725 case hwmon_pwm:
726 switch (attr) {
727 case hwmon_pwm_input:
728 case hwmon_pwm_enable:
729 return 0644;
730 default:
731 break;
732 }
733 break;
734 default:
735 break;
736 }
737 return 0;
738 }
739
740 static const struct hwmon_channel_info * const max6650_info[] = {
741 HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_TARGET | HWMON_F_DIV |
742 HWMON_F_MIN_ALARM | HWMON_F_MAX_ALARM |
743 HWMON_F_FAULT,
744 HWMON_F_INPUT, HWMON_F_INPUT, HWMON_F_INPUT),
745 HWMON_CHANNEL_INFO(pwm, HWMON_PWM_INPUT | HWMON_PWM_ENABLE),
746 NULL
747 };
748
749 static const struct hwmon_ops max6650_hwmon_ops = {
750 .read = max6650_read,
751 .write = max6650_write,
752 .is_visible = max6650_is_visible,
753 };
754
755 static const struct hwmon_chip_info max6650_chip_info = {
756 .ops = &max6650_hwmon_ops,
757 .info = max6650_info,
758 };
759
760 static const struct i2c_device_id max6650_id[];
761
max6650_probe(struct i2c_client * client)762 static int max6650_probe(struct i2c_client *client)
763 {
764 struct thermal_cooling_device *cooling_dev;
765 struct device *dev = &client->dev;
766 const struct of_device_id *of_id =
767 of_match_device(of_match_ptr(max6650_dt_match), dev);
768 struct max6650_data *data;
769 struct device *hwmon_dev;
770 int err;
771
772 data = devm_kzalloc(dev, sizeof(struct max6650_data), GFP_KERNEL);
773 if (!data)
774 return -ENOMEM;
775
776 data->client = client;
777 i2c_set_clientdata(client, data);
778 mutex_init(&data->update_lock);
779 data->nr_fans = of_id ? (int)(uintptr_t)of_id->data :
780 i2c_match_id(max6650_id, client)->driver_data;
781
782 /*
783 * Initialize the max6650 chip
784 */
785 err = max6650_init_client(data, client);
786 if (err)
787 return err;
788
789 hwmon_dev = devm_hwmon_device_register_with_info(dev,
790 client->name, data,
791 &max6650_chip_info,
792 max6650_groups);
793 err = PTR_ERR_OR_ZERO(hwmon_dev);
794 if (err)
795 return err;
796
797 if (IS_ENABLED(CONFIG_THERMAL)) {
798 cooling_dev = devm_thermal_of_cooling_device_register(dev,
799 dev->of_node, client->name,
800 data, &max6650_cooling_ops);
801 if (IS_ERR(cooling_dev)) {
802 dev_warn(dev, "thermal cooling device register failed: %ld\n",
803 PTR_ERR(cooling_dev));
804 }
805 }
806
807 return 0;
808 }
809
810 static const struct i2c_device_id max6650_id[] = {
811 { "max6650", 1 },
812 { "max6651", 4 },
813 { }
814 };
815 MODULE_DEVICE_TABLE(i2c, max6650_id);
816
817 static struct i2c_driver max6650_driver = {
818 .driver = {
819 .name = "max6650",
820 .of_match_table = of_match_ptr(max6650_dt_match),
821 },
822 .probe = max6650_probe,
823 .id_table = max6650_id,
824 };
825
826 module_i2c_driver(max6650_driver);
827
828 MODULE_AUTHOR("Hans J. Koch");
829 MODULE_DESCRIPTION("MAX6650 sensor driver");
830 MODULE_LICENSE("GPL");
831
