xref: /linux/drivers/hwmon/mlxreg-fan.c (revision a1c613ae4c322ddd58d5a8539dbfba2a0380a8c0)
1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 //
3 // Copyright (c) 2018 Mellanox Technologies. All rights reserved.
4 // Copyright (c) 2018 Vadim Pasternak <vadimp@mellanox.com>
5 
6 #include <linux/bitops.h>
7 #include <linux/device.h>
8 #include <linux/hwmon.h>
9 #include <linux/module.h>
10 #include <linux/platform_data/mlxreg.h>
11 #include <linux/platform_device.h>
12 #include <linux/regmap.h>
13 #include <linux/thermal.h>
14 
15 #define MLXREG_FAN_MAX_TACHO		24
16 #define MLXREG_FAN_MAX_PWM		4
17 #define MLXREG_FAN_PWM_NOT_CONNECTED	0xff
18 #define MLXREG_FAN_MAX_STATE		10
19 #define MLXREG_FAN_MIN_DUTY		51	/* 20% */
20 #define MLXREG_FAN_MAX_DUTY		255	/* 100% */
21 #define MLXREG_FAN_SPEED_MIN_LEVEL		2	/* 20 percent */
22 #define MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF	44
23 #define MLXREG_FAN_TACHO_DIV_MIN		283
24 #define MLXREG_FAN_TACHO_DIV_DEF		(MLXREG_FAN_TACHO_DIV_MIN * 4)
25 #define MLXREG_FAN_TACHO_DIV_SCALE_MAX	64
26 /*
27  * FAN datasheet defines the formula for RPM calculations as RPM = 15/t-high.
28  * The logic in a programmable device measures the time t-high by sampling the
29  * tachometer every t-sample (with the default value 11.32 uS) and increment
30  * a counter (N) as long as the pulse has not change:
31  * RPM = 15 / (t-sample * (K + Regval)), where:
32  * Regval: is the value read from the programmable device register;
33  *  - 0xff - represents tachometer fault;
34  *  - 0xfe - represents tachometer minimum value , which is 4444 RPM;
35  *  - 0x00 - represents tachometer maximum value , which is 300000 RPM;
36  * K: is 44 and it represents the minimum allowed samples per pulse;
37  * N: is equal K + Regval;
38  * In order to calculate RPM from the register value the following formula is
39  * used: RPM = 15 / ((Regval + K) * 11.32) * 10^(-6)), which in  the
40  * default case is modified to:
41  * RPM = 15000000 * 100 / ((Regval + 44) * 1132);
42  * - for Regval 0x00, RPM will be 15000000 * 100 / (44 * 1132) = 30115;
43  * - for Regval 0xfe, RPM will be 15000000 * 100 / ((254 + 44) * 1132) = 4446;
44  * In common case the formula is modified to:
45  * RPM = 15000000 * 100 / ((Regval + samples) * divider).
46  */
47 #define MLXREG_FAN_GET_RPM(rval, d, s)	(DIV_ROUND_CLOSEST(15000000 * 100, \
48 					 ((rval) + (s)) * (d)))
49 #define MLXREG_FAN_GET_FAULT(val, mask) ((val) == (mask))
50 #define MLXREG_FAN_PWM_DUTY2STATE(duty)	(DIV_ROUND_CLOSEST((duty) *	\
51 					 MLXREG_FAN_MAX_STATE,		\
52 					 MLXREG_FAN_MAX_DUTY))
53 #define MLXREG_FAN_PWM_STATE2DUTY(stat)	(DIV_ROUND_CLOSEST((stat) *	\
54 					 MLXREG_FAN_MAX_DUTY,		\
55 					 MLXREG_FAN_MAX_STATE))
56 
57 struct mlxreg_fan;
58 
59 /*
60  * struct mlxreg_fan_tacho - tachometer data (internal use):
61  *
62  * @connected: indicates if tachometer is connected;
63  * @reg: register offset;
64  * @mask: fault mask;
65  * @prsnt: present register offset;
66  */
67 struct mlxreg_fan_tacho {
68 	bool connected;
69 	u32 reg;
70 	u32 mask;
71 	u32 prsnt;
72 };
73 
74 /*
75  * struct mlxreg_fan_pwm - PWM data (internal use):
76  *
77  * @fan: private data;
78  * @connected: indicates if PWM is connected;
79  * @reg: register offset;
80  * @cooling: cooling device levels;
81  * @last_hwmon_state: last cooling state set by hwmon subsystem;
82  * @last_thermal_state: last cooling state set by thermal subsystem;
83  * @cdev: cooling device;
84  */
85 struct mlxreg_fan_pwm {
86 	struct mlxreg_fan *fan;
87 	bool connected;
88 	u32 reg;
89 	unsigned long last_hwmon_state;
90 	unsigned long last_thermal_state;
91 	struct thermal_cooling_device *cdev;
92 };
93 
94 /*
95  * struct mlxreg_fan - private data (internal use):
96  *
97  * @dev: basic device;
98  * @regmap: register map of parent device;
99  * @tacho: tachometer data;
100  * @pwm: PWM data;
101  * @tachos_per_drwr - number of tachometers per drawer;
102  * @samples: minimum allowed samples per pulse;
103  * @divider: divider value for tachometer RPM calculation;
104  */
105 struct mlxreg_fan {
106 	struct device *dev;
107 	void *regmap;
108 	struct mlxreg_core_platform_data *pdata;
109 	struct mlxreg_fan_tacho tacho[MLXREG_FAN_MAX_TACHO];
110 	struct mlxreg_fan_pwm pwm[MLXREG_FAN_MAX_PWM];
111 	int tachos_per_drwr;
112 	int samples;
113 	int divider;
114 };
115 
116 static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
117 				    unsigned long state);
118 
119 static int
mlxreg_fan_read(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long * val)120 mlxreg_fan_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
121 		int channel, long *val)
122 {
123 	struct mlxreg_fan *fan = dev_get_drvdata(dev);
124 	struct mlxreg_fan_tacho *tacho;
125 	struct mlxreg_fan_pwm *pwm;
126 	u32 regval;
127 	int err;
128 
129 	switch (type) {
130 	case hwmon_fan:
131 		tacho = &fan->tacho[channel];
132 		switch (attr) {
133 		case hwmon_fan_input:
134 			/*
135 			 * Check FAN presence: FAN related bit in presence register is one,
136 			 * if FAN is physically connected, zero - otherwise.
137 			 */
138 			if (tacho->prsnt && fan->tachos_per_drwr) {
139 				err = regmap_read(fan->regmap, tacho->prsnt, &regval);
140 				if (err)
141 					return err;
142 
143 				/*
144 				 * Map channel to presence bit - drawer can be equipped with
145 				 * one or few FANs, while presence is indicated per drawer.
146 				 */
147 				if (BIT(channel / fan->tachos_per_drwr) & regval) {
148 					/* FAN is not connected - return zero for FAN speed. */
149 					*val = 0;
150 					return 0;
151 				}
152 			}
153 
154 			err = regmap_read(fan->regmap, tacho->reg, &regval);
155 			if (err)
156 				return err;
157 
158 			if (MLXREG_FAN_GET_FAULT(regval, tacho->mask)) {
159 				/* FAN is broken - return zero for FAN speed. */
160 				*val = 0;
161 				return 0;
162 			}
163 
164 			*val = MLXREG_FAN_GET_RPM(regval, fan->divider,
165 						  fan->samples);
166 			break;
167 
168 		case hwmon_fan_fault:
169 			err = regmap_read(fan->regmap, tacho->reg, &regval);
170 			if (err)
171 				return err;
172 
173 			*val = MLXREG_FAN_GET_FAULT(regval, tacho->mask);
174 			break;
175 
176 		default:
177 			return -EOPNOTSUPP;
178 		}
179 		break;
180 
181 	case hwmon_pwm:
182 		pwm = &fan->pwm[channel];
183 		switch (attr) {
184 		case hwmon_pwm_input:
185 			err = regmap_read(fan->regmap, pwm->reg, &regval);
186 			if (err)
187 				return err;
188 
189 			*val = regval;
190 			break;
191 
192 		default:
193 			return -EOPNOTSUPP;
194 		}
195 		break;
196 
197 	default:
198 		return -EOPNOTSUPP;
199 	}
200 
201 	return 0;
202 }
203 
204 static int
mlxreg_fan_write(struct device * dev,enum hwmon_sensor_types type,u32 attr,int channel,long val)205 mlxreg_fan_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
206 		 int channel, long val)
207 {
208 	struct mlxreg_fan *fan = dev_get_drvdata(dev);
209 	struct mlxreg_fan_pwm *pwm;
210 
211 	switch (type) {
212 	case hwmon_pwm:
213 		switch (attr) {
214 		case hwmon_pwm_input:
215 			if (val < MLXREG_FAN_MIN_DUTY ||
216 			    val > MLXREG_FAN_MAX_DUTY)
217 				return -EINVAL;
218 			pwm = &fan->pwm[channel];
219 			/* If thermal is configured - handle PWM limit setting. */
220 			if (IS_REACHABLE(CONFIG_THERMAL)) {
221 				pwm->last_hwmon_state = MLXREG_FAN_PWM_DUTY2STATE(val);
222 				/*
223 				 * Update PWM only in case requested state is not less than the
224 				 * last thermal state.
225 				 */
226 				if (pwm->last_hwmon_state >= pwm->last_thermal_state)
227 					return mlxreg_fan_set_cur_state(pwm->cdev,
228 									pwm->last_hwmon_state);
229 				return 0;
230 			}
231 			return regmap_write(fan->regmap, pwm->reg, val);
232 		default:
233 			return -EOPNOTSUPP;
234 		}
235 		break;
236 
237 	default:
238 		return -EOPNOTSUPP;
239 	}
240 
241 	return -EOPNOTSUPP;
242 }
243 
244 static umode_t
mlxreg_fan_is_visible(const void * data,enum hwmon_sensor_types type,u32 attr,int channel)245 mlxreg_fan_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
246 		      int channel)
247 {
248 	switch (type) {
249 	case hwmon_fan:
250 		if (!(((struct mlxreg_fan *)data)->tacho[channel].connected))
251 			return 0;
252 
253 		switch (attr) {
254 		case hwmon_fan_input:
255 		case hwmon_fan_fault:
256 			return 0444;
257 		default:
258 			break;
259 		}
260 		break;
261 
262 	case hwmon_pwm:
263 		if (!(((struct mlxreg_fan *)data)->pwm[channel].connected))
264 			return 0;
265 
266 		switch (attr) {
267 		case hwmon_pwm_input:
268 			return 0644;
269 		default:
270 			break;
271 		}
272 		break;
273 
274 	default:
275 		break;
276 	}
277 
278 	return 0;
279 }
280 
281 static char *mlxreg_fan_name[] = {
282 	"mlxreg_fan",
283 	"mlxreg_fan1",
284 	"mlxreg_fan2",
285 	"mlxreg_fan3",
286 };
287 
288 static const struct hwmon_channel_info * const mlxreg_fan_hwmon_info[] = {
289 	HWMON_CHANNEL_INFO(fan,
290 			   HWMON_F_INPUT | HWMON_F_FAULT,
291 			   HWMON_F_INPUT | HWMON_F_FAULT,
292 			   HWMON_F_INPUT | HWMON_F_FAULT,
293 			   HWMON_F_INPUT | HWMON_F_FAULT,
294 			   HWMON_F_INPUT | HWMON_F_FAULT,
295 			   HWMON_F_INPUT | HWMON_F_FAULT,
296 			   HWMON_F_INPUT | HWMON_F_FAULT,
297 			   HWMON_F_INPUT | HWMON_F_FAULT,
298 			   HWMON_F_INPUT | HWMON_F_FAULT,
299 			   HWMON_F_INPUT | HWMON_F_FAULT,
300 			   HWMON_F_INPUT | HWMON_F_FAULT,
301 			   HWMON_F_INPUT | HWMON_F_FAULT,
302 			   HWMON_F_INPUT | HWMON_F_FAULT,
303 			   HWMON_F_INPUT | HWMON_F_FAULT,
304 			   HWMON_F_INPUT | HWMON_F_FAULT,
305 			   HWMON_F_INPUT | HWMON_F_FAULT,
306 			   HWMON_F_INPUT | HWMON_F_FAULT,
307 			   HWMON_F_INPUT | HWMON_F_FAULT,
308 			   HWMON_F_INPUT | HWMON_F_FAULT,
309 			   HWMON_F_INPUT | HWMON_F_FAULT,
310 			   HWMON_F_INPUT | HWMON_F_FAULT,
311 			   HWMON_F_INPUT | HWMON_F_FAULT,
312 			   HWMON_F_INPUT | HWMON_F_FAULT,
313 			   HWMON_F_INPUT | HWMON_F_FAULT),
314 	HWMON_CHANNEL_INFO(pwm,
315 			   HWMON_PWM_INPUT,
316 			   HWMON_PWM_INPUT,
317 			   HWMON_PWM_INPUT,
318 			   HWMON_PWM_INPUT),
319 	NULL
320 };
321 
322 static const struct hwmon_ops mlxreg_fan_hwmon_hwmon_ops = {
323 	.is_visible = mlxreg_fan_is_visible,
324 	.read = mlxreg_fan_read,
325 	.write = mlxreg_fan_write,
326 };
327 
328 static const struct hwmon_chip_info mlxreg_fan_hwmon_chip_info = {
329 	.ops = &mlxreg_fan_hwmon_hwmon_ops,
330 	.info = mlxreg_fan_hwmon_info,
331 };
332 
mlxreg_fan_get_max_state(struct thermal_cooling_device * cdev,unsigned long * state)333 static int mlxreg_fan_get_max_state(struct thermal_cooling_device *cdev,
334 				    unsigned long *state)
335 {
336 	*state = MLXREG_FAN_MAX_STATE;
337 	return 0;
338 }
339 
mlxreg_fan_get_cur_state(struct thermal_cooling_device * cdev,unsigned long * state)340 static int mlxreg_fan_get_cur_state(struct thermal_cooling_device *cdev,
341 				    unsigned long *state)
342 
343 {
344 	struct mlxreg_fan_pwm *pwm = cdev->devdata;
345 	struct mlxreg_fan *fan = pwm->fan;
346 	u32 regval;
347 	int err;
348 
349 	err = regmap_read(fan->regmap, pwm->reg, &regval);
350 	if (err) {
351 		dev_err(fan->dev, "Failed to query PWM duty\n");
352 		return err;
353 	}
354 
355 	*state = MLXREG_FAN_PWM_DUTY2STATE(regval);
356 
357 	return 0;
358 }
359 
mlxreg_fan_set_cur_state(struct thermal_cooling_device * cdev,unsigned long state)360 static int mlxreg_fan_set_cur_state(struct thermal_cooling_device *cdev,
361 				    unsigned long state)
362 
363 {
364 	struct mlxreg_fan_pwm *pwm = cdev->devdata;
365 	struct mlxreg_fan *fan = pwm->fan;
366 	int err;
367 
368 	if (state > MLXREG_FAN_MAX_STATE)
369 		return -EINVAL;
370 
371 	/* Save thermal state. */
372 	pwm->last_thermal_state = state;
373 
374 	state = max_t(unsigned long, state, pwm->last_hwmon_state);
375 	err = regmap_write(fan->regmap, pwm->reg,
376 			   MLXREG_FAN_PWM_STATE2DUTY(state));
377 	if (err) {
378 		dev_err(fan->dev, "Failed to write PWM duty\n");
379 		return err;
380 	}
381 	return 0;
382 }
383 
384 static const struct thermal_cooling_device_ops mlxreg_fan_cooling_ops = {
385 	.get_max_state	= mlxreg_fan_get_max_state,
386 	.get_cur_state	= mlxreg_fan_get_cur_state,
387 	.set_cur_state	= mlxreg_fan_set_cur_state,
388 };
389 
mlxreg_fan_connect_verify(struct mlxreg_fan * fan,struct mlxreg_core_data * data)390 static int mlxreg_fan_connect_verify(struct mlxreg_fan *fan,
391 				     struct mlxreg_core_data *data)
392 {
393 	u32 regval;
394 	int err;
395 
396 	err = regmap_read(fan->regmap, data->capability, &regval);
397 	if (err) {
398 		dev_err(fan->dev, "Failed to query capability register 0x%08x\n",
399 			data->capability);
400 		return err;
401 	}
402 
403 	return !!(regval & data->bit);
404 }
405 
mlxreg_pwm_connect_verify(struct mlxreg_fan * fan,struct mlxreg_core_data * data)406 static int mlxreg_pwm_connect_verify(struct mlxreg_fan *fan,
407 				     struct mlxreg_core_data *data)
408 {
409 	u32 regval;
410 	int err;
411 
412 	err = regmap_read(fan->regmap, data->reg, &regval);
413 	if (err) {
414 		dev_err(fan->dev, "Failed to query pwm register 0x%08x\n",
415 			data->reg);
416 		return err;
417 	}
418 
419 	return regval != MLXREG_FAN_PWM_NOT_CONNECTED;
420 }
421 
mlxreg_fan_speed_divider_get(struct mlxreg_fan * fan,struct mlxreg_core_data * data)422 static int mlxreg_fan_speed_divider_get(struct mlxreg_fan *fan,
423 					struct mlxreg_core_data *data)
424 {
425 	u32 regval;
426 	int err;
427 
428 	err = regmap_read(fan->regmap, data->capability, &regval);
429 	if (err) {
430 		dev_err(fan->dev, "Failed to query capability register 0x%08x\n",
431 			data->capability);
432 		return err;
433 	}
434 
435 	/*
436 	 * Set divider value according to the capability register, in case it
437 	 * contains valid value. Otherwise use default value. The purpose of
438 	 * this validation is to protect against the old hardware, in which
439 	 * this register can return zero.
440 	 */
441 	if (regval > 0 && regval <= MLXREG_FAN_TACHO_DIV_SCALE_MAX)
442 		fan->divider = regval * MLXREG_FAN_TACHO_DIV_MIN;
443 
444 	return 0;
445 }
446 
mlxreg_fan_config(struct mlxreg_fan * fan,struct mlxreg_core_platform_data * pdata)447 static int mlxreg_fan_config(struct mlxreg_fan *fan,
448 			     struct mlxreg_core_platform_data *pdata)
449 {
450 	int tacho_num = 0, tacho_avail = 0, pwm_num = 0, i;
451 	struct mlxreg_core_data *data = pdata->data;
452 	bool configured = false;
453 	int err;
454 
455 	fan->samples = MLXREG_FAN_TACHO_SAMPLES_PER_PULSE_DEF;
456 	fan->divider = MLXREG_FAN_TACHO_DIV_DEF;
457 	for (i = 0; i < pdata->counter; i++, data++) {
458 		if (strnstr(data->label, "tacho", sizeof(data->label))) {
459 			if (tacho_num == MLXREG_FAN_MAX_TACHO) {
460 				dev_err(fan->dev, "too many tacho entries: %s\n",
461 					data->label);
462 				return -EINVAL;
463 			}
464 
465 			if (data->capability) {
466 				err = mlxreg_fan_connect_verify(fan, data);
467 				if (err < 0)
468 					return err;
469 				else if (!err) {
470 					tacho_num++;
471 					continue;
472 				}
473 			}
474 
475 			fan->tacho[tacho_num].reg = data->reg;
476 			fan->tacho[tacho_num].mask = data->mask;
477 			fan->tacho[tacho_num].prsnt = data->reg_prsnt;
478 			fan->tacho[tacho_num++].connected = true;
479 			tacho_avail++;
480 		} else if (strnstr(data->label, "pwm", sizeof(data->label))) {
481 			if (pwm_num == MLXREG_FAN_MAX_TACHO) {
482 				dev_err(fan->dev, "too many pwm entries: %s\n",
483 					data->label);
484 				return -EINVAL;
485 			}
486 
487 			/* Validate if more then one PWM is connected. */
488 			if (pwm_num) {
489 				err = mlxreg_pwm_connect_verify(fan, data);
490 				if (err < 0)
491 					return err;
492 				else if (!err)
493 					continue;
494 			}
495 
496 			fan->pwm[pwm_num].reg = data->reg;
497 			fan->pwm[pwm_num].connected = true;
498 			pwm_num++;
499 		} else if (strnstr(data->label, "conf", sizeof(data->label))) {
500 			if (configured) {
501 				dev_err(fan->dev, "duplicate conf entry: %s\n",
502 					data->label);
503 				return -EINVAL;
504 			}
505 			/* Validate that conf parameters are not zeros. */
506 			if (!data->mask && !data->bit && !data->capability) {
507 				dev_err(fan->dev, "invalid conf entry params: %s\n",
508 					data->label);
509 				return -EINVAL;
510 			}
511 			if (data->capability) {
512 				err = mlxreg_fan_speed_divider_get(fan, data);
513 				if (err)
514 					return err;
515 			} else {
516 				if (data->mask)
517 					fan->samples = data->mask;
518 				if (data->bit)
519 					fan->divider = data->bit;
520 			}
521 			configured = true;
522 		} else {
523 			dev_err(fan->dev, "invalid label: %s\n", data->label);
524 			return -EINVAL;
525 		}
526 	}
527 
528 	if (pdata->capability) {
529 		int drwr_avail;
530 		u32 regval;
531 
532 		/* Obtain the number of FAN drawers, supported by system. */
533 		err = regmap_read(fan->regmap, pdata->capability, &regval);
534 		if (err) {
535 			dev_err(fan->dev, "Failed to query capability register 0x%08x\n",
536 				pdata->capability);
537 			return err;
538 		}
539 
540 		drwr_avail = hweight32(regval);
541 		if (!tacho_avail || !drwr_avail || tacho_avail < drwr_avail) {
542 			dev_err(fan->dev, "Configuration is invalid: drawers num %d tachos num %d\n",
543 				drwr_avail, tacho_avail);
544 			return -EINVAL;
545 		}
546 
547 		/* Set the number of tachometers per one drawer. */
548 		fan->tachos_per_drwr = tacho_avail / drwr_avail;
549 	}
550 
551 	return 0;
552 }
553 
mlxreg_fan_cooling_config(struct device * dev,struct mlxreg_fan * fan)554 static int mlxreg_fan_cooling_config(struct device *dev, struct mlxreg_fan *fan)
555 {
556 	int i;
557 
558 	for (i = 0; i < MLXREG_FAN_MAX_PWM; i++) {
559 		struct mlxreg_fan_pwm *pwm = &fan->pwm[i];
560 
561 		if (!pwm->connected)
562 			continue;
563 		pwm->fan = fan;
564 		pwm->cdev = devm_thermal_of_cooling_device_register(dev, NULL, mlxreg_fan_name[i],
565 								    pwm, &mlxreg_fan_cooling_ops);
566 		if (IS_ERR(pwm->cdev)) {
567 			dev_err(dev, "Failed to register cooling device\n");
568 			return PTR_ERR(pwm->cdev);
569 		}
570 
571 		/* Set minimal PWM speed. */
572 		pwm->last_hwmon_state = MLXREG_FAN_PWM_DUTY2STATE(MLXREG_FAN_MIN_DUTY);
573 	}
574 
575 	return 0;
576 }
577 
mlxreg_fan_probe(struct platform_device * pdev)578 static int mlxreg_fan_probe(struct platform_device *pdev)
579 {
580 	struct mlxreg_core_platform_data *pdata;
581 	struct device *dev = &pdev->dev;
582 	struct mlxreg_fan *fan;
583 	struct device *hwm;
584 	int err;
585 
586 	pdata = dev_get_platdata(dev);
587 	if (!pdata) {
588 		dev_err(dev, "Failed to get platform data.\n");
589 		return -EINVAL;
590 	}
591 
592 	fan = devm_kzalloc(dev, sizeof(*fan), GFP_KERNEL);
593 	if (!fan)
594 		return -ENOMEM;
595 
596 	fan->dev = dev;
597 	fan->regmap = pdata->regmap;
598 
599 	err = mlxreg_fan_config(fan, pdata);
600 	if (err)
601 		return err;
602 
603 	hwm = devm_hwmon_device_register_with_info(dev, "mlxreg_fan",
604 						   fan,
605 						   &mlxreg_fan_hwmon_chip_info,
606 						   NULL);
607 	if (IS_ERR(hwm)) {
608 		dev_err(dev, "Failed to register hwmon device\n");
609 		return PTR_ERR(hwm);
610 	}
611 
612 	if (IS_REACHABLE(CONFIG_THERMAL))
613 		err = mlxreg_fan_cooling_config(dev, fan);
614 
615 	return err;
616 }
617 
618 static struct platform_driver mlxreg_fan_driver = {
619 	.driver = {
620 	    .name = "mlxreg-fan",
621 	},
622 	.probe = mlxreg_fan_probe,
623 };
624 
625 module_platform_driver(mlxreg_fan_driver);
626 
627 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
628 MODULE_DESCRIPTION("Mellanox FAN driver");
629 MODULE_LICENSE("GPL");
630 MODULE_ALIAS("platform:mlxreg-fan");
631