blob: 39781945a5d236152c3668f040ef670a25b75a6e [file] [log] [blame]
Simon Guinotd6fe1362010-10-22 00:44:19 +02001/*
2 * gpio-fan.c - Hwmon driver for fans connected to GPIO lines.
3 *
4 * Copyright (C) 2010 LaCie
5 *
6 * Author: Simon Guinot <sguinot@lacie.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#include <linux/module.h>
24#include <linux/init.h>
25#include <linux/slab.h>
26#include <linux/interrupt.h>
27#include <linux/irq.h>
28#include <linux/platform_device.h>
29#include <linux/err.h>
30#include <linux/mutex.h>
31#include <linux/hwmon.h>
32#include <linux/gpio.h>
33#include <linux/gpio-fan.h>
Jamie Lentin55fb8b062012-09-14 17:07:06 +010034#include <linux/of_platform.h>
35#include <linux/of_gpio.h>
Simon Guinotd6fe1362010-10-22 00:44:19 +020036
37struct gpio_fan_data {
38 struct platform_device *pdev;
39 struct device *hwmon_dev;
40 struct mutex lock; /* lock GPIOs operations. */
41 int num_ctrl;
42 unsigned *ctrl;
43 int num_speed;
44 struct gpio_fan_speed *speed;
45 int speed_index;
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +020046#ifdef CONFIG_PM_SLEEP
Simon Guinotd6fe1362010-10-22 00:44:19 +020047 int resume_speed;
48#endif
49 bool pwm_enable;
50 struct gpio_fan_alarm *alarm;
51 struct work_struct alarm_work;
52};
53
54/*
55 * Alarm GPIO.
56 */
57
58static void fan_alarm_notify(struct work_struct *ws)
59{
60 struct gpio_fan_data *fan_data =
61 container_of(ws, struct gpio_fan_data, alarm_work);
62
63 sysfs_notify(&fan_data->pdev->dev.kobj, NULL, "fan1_alarm");
64 kobject_uevent(&fan_data->pdev->dev.kobj, KOBJ_CHANGE);
65}
66
67static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id)
68{
69 struct gpio_fan_data *fan_data = dev_id;
70
71 schedule_work(&fan_data->alarm_work);
72
73 return IRQ_NONE;
74}
75
76static ssize_t show_fan_alarm(struct device *dev,
77 struct device_attribute *attr, char *buf)
78{
79 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
80 struct gpio_fan_alarm *alarm = fan_data->alarm;
81 int value = gpio_get_value(alarm->gpio);
82
83 if (alarm->active_low)
84 value = !value;
85
86 return sprintf(buf, "%d\n", value);
87}
88
89static DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL);
90
91static int fan_alarm_init(struct gpio_fan_data *fan_data,
92 struct gpio_fan_alarm *alarm)
93{
94 int err;
95 int alarm_irq;
96 struct platform_device *pdev = fan_data->pdev;
97
98 fan_data->alarm = alarm;
99
Guenter Roeckd00985f2012-06-02 09:58:07 -0700100 err = devm_gpio_request(&pdev->dev, alarm->gpio, "GPIO fan alarm");
Simon Guinotd6fe1362010-10-22 00:44:19 +0200101 if (err)
102 return err;
103
104 err = gpio_direction_input(alarm->gpio);
105 if (err)
Guenter Roeckd00985f2012-06-02 09:58:07 -0700106 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200107
108 err = device_create_file(&pdev->dev, &dev_attr_fan1_alarm);
109 if (err)
Guenter Roeckd00985f2012-06-02 09:58:07 -0700110 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200111
112 /*
113 * If the alarm GPIO don't support interrupts, just leave
114 * without initializing the fail notification support.
115 */
116 alarm_irq = gpio_to_irq(alarm->gpio);
117 if (alarm_irq < 0)
118 return 0;
119
120 INIT_WORK(&fan_data->alarm_work, fan_alarm_notify);
Thomas Gleixnerdced35a2011-03-28 17:49:12 +0200121 irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
Guenter Roeckd00985f2012-06-02 09:58:07 -0700122 err = devm_request_irq(&pdev->dev, alarm_irq, fan_alarm_irq_handler,
123 IRQF_SHARED, "GPIO fan alarm", fan_data);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200124 if (err)
125 goto err_free_sysfs;
126
127 return 0;
128
129err_free_sysfs:
130 device_remove_file(&pdev->dev, &dev_attr_fan1_alarm);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200131 return err;
132}
133
134static void fan_alarm_free(struct gpio_fan_data *fan_data)
135{
136 struct platform_device *pdev = fan_data->pdev;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200137
Simon Guinotd6fe1362010-10-22 00:44:19 +0200138 device_remove_file(&pdev->dev, &dev_attr_fan1_alarm);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200139}
140
141/*
142 * Control GPIOs.
143 */
144
145/* Must be called with fan_data->lock held, except during initialization. */
146static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
147{
148 int i;
149
150 for (i = 0; i < fan_data->num_ctrl; i++)
151 gpio_set_value(fan_data->ctrl[i], (ctrl_val >> i) & 1);
152}
153
154static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
155{
156 int i;
157 int ctrl_val = 0;
158
159 for (i = 0; i < fan_data->num_ctrl; i++) {
160 int value;
161
162 value = gpio_get_value(fan_data->ctrl[i]);
163 ctrl_val |= (value << i);
164 }
165 return ctrl_val;
166}
167
168/* Must be called with fan_data->lock held, except during initialization. */
169static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index)
170{
171 if (fan_data->speed_index == speed_index)
172 return;
173
174 __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val);
175 fan_data->speed_index = speed_index;
176}
177
178static int get_fan_speed_index(struct gpio_fan_data *fan_data)
179{
180 int ctrl_val = __get_fan_ctrl(fan_data);
181 int i;
182
183 for (i = 0; i < fan_data->num_speed; i++)
184 if (fan_data->speed[i].ctrl_val == ctrl_val)
185 return i;
186
187 dev_warn(&fan_data->pdev->dev,
188 "missing speed array entry for GPIO value 0x%x\n", ctrl_val);
189
190 return -EINVAL;
191}
192
193static int rpm_to_speed_index(struct gpio_fan_data *fan_data, int rpm)
194{
195 struct gpio_fan_speed *speed = fan_data->speed;
196 int i;
197
198 for (i = 0; i < fan_data->num_speed; i++)
199 if (speed[i].rpm >= rpm)
200 return i;
201
202 return fan_data->num_speed - 1;
203}
204
205static ssize_t show_pwm(struct device *dev,
206 struct device_attribute *attr, char *buf)
207{
208 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
209 u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1);
210
211 return sprintf(buf, "%d\n", pwm);
212}
213
214static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
215 const char *buf, size_t count)
216{
217 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
218 unsigned long pwm;
219 int speed_index;
220 int ret = count;
221
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100222 if (kstrtoul(buf, 10, &pwm) || pwm > 255)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200223 return -EINVAL;
224
225 mutex_lock(&fan_data->lock);
226
227 if (!fan_data->pwm_enable) {
228 ret = -EPERM;
229 goto exit_unlock;
230 }
231
232 speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255);
233 set_fan_speed(fan_data, speed_index);
234
235exit_unlock:
236 mutex_unlock(&fan_data->lock);
237
238 return ret;
239}
240
241static ssize_t show_pwm_enable(struct device *dev,
242 struct device_attribute *attr, char *buf)
243{
244 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
245
246 return sprintf(buf, "%d\n", fan_data->pwm_enable);
247}
248
249static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr,
250 const char *buf, size_t count)
251{
252 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
253 unsigned long val;
254
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100255 if (kstrtoul(buf, 10, &val) || val > 1)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200256 return -EINVAL;
257
258 if (fan_data->pwm_enable == val)
259 return count;
260
261 mutex_lock(&fan_data->lock);
262
263 fan_data->pwm_enable = val;
264
265 /* Disable manual control mode: set fan at full speed. */
266 if (val == 0)
267 set_fan_speed(fan_data, fan_data->num_speed - 1);
268
269 mutex_unlock(&fan_data->lock);
270
271 return count;
272}
273
274static ssize_t show_pwm_mode(struct device *dev,
275 struct device_attribute *attr, char *buf)
276{
277 return sprintf(buf, "0\n");
278}
279
280static ssize_t show_rpm_min(struct device *dev,
281 struct device_attribute *attr, char *buf)
282{
283 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
284
285 return sprintf(buf, "%d\n", fan_data->speed[0].rpm);
286}
287
288static ssize_t show_rpm_max(struct device *dev,
289 struct device_attribute *attr, char *buf)
290{
291 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
292
293 return sprintf(buf, "%d\n",
294 fan_data->speed[fan_data->num_speed - 1].rpm);
295}
296
297static ssize_t show_rpm(struct device *dev,
298 struct device_attribute *attr, char *buf)
299{
300 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
301
302 return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm);
303}
304
305static ssize_t set_rpm(struct device *dev, struct device_attribute *attr,
306 const char *buf, size_t count)
307{
308 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
309 unsigned long rpm;
310 int ret = count;
311
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100312 if (kstrtoul(buf, 10, &rpm))
Simon Guinotd6fe1362010-10-22 00:44:19 +0200313 return -EINVAL;
314
315 mutex_lock(&fan_data->lock);
316
317 if (!fan_data->pwm_enable) {
318 ret = -EPERM;
319 goto exit_unlock;
320 }
321
322 set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm));
323
324exit_unlock:
325 mutex_unlock(&fan_data->lock);
326
327 return ret;
328}
329
330static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm);
331static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
332 show_pwm_enable, set_pwm_enable);
333static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL);
334static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL);
335static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL);
336static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL);
337static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm);
338
339static struct attribute *gpio_fan_ctrl_attributes[] = {
340 &dev_attr_pwm1.attr,
341 &dev_attr_pwm1_enable.attr,
342 &dev_attr_pwm1_mode.attr,
343 &dev_attr_fan1_input.attr,
344 &dev_attr_fan1_target.attr,
345 &dev_attr_fan1_min.attr,
346 &dev_attr_fan1_max.attr,
347 NULL
348};
349
350static const struct attribute_group gpio_fan_ctrl_group = {
351 .attrs = gpio_fan_ctrl_attributes,
352};
353
354static int fan_ctrl_init(struct gpio_fan_data *fan_data,
355 struct gpio_fan_platform_data *pdata)
356{
357 struct platform_device *pdev = fan_data->pdev;
358 int num_ctrl = pdata->num_ctrl;
359 unsigned *ctrl = pdata->ctrl;
360 int i, err;
361
362 for (i = 0; i < num_ctrl; i++) {
Guenter Roeckd00985f2012-06-02 09:58:07 -0700363 err = devm_gpio_request(&pdev->dev, ctrl[i],
364 "GPIO fan control");
Simon Guinotd6fe1362010-10-22 00:44:19 +0200365 if (err)
Guenter Roeckd00985f2012-06-02 09:58:07 -0700366 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200367
368 err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i]));
Guenter Roeckd00985f2012-06-02 09:58:07 -0700369 if (err)
370 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200371 }
372
Simon Guinotd6fe1362010-10-22 00:44:19 +0200373 fan_data->num_ctrl = num_ctrl;
374 fan_data->ctrl = ctrl;
375 fan_data->num_speed = pdata->num_speed;
376 fan_data->speed = pdata->speed;
377 fan_data->pwm_enable = true; /* Enable manual fan speed control. */
378 fan_data->speed_index = get_fan_speed_index(fan_data);
Guenter Roeckd00985f2012-06-02 09:58:07 -0700379 if (fan_data->speed_index < 0)
380 return -ENODEV;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200381
Axel Lin4f5b7992010-11-09 08:41:48 +0000382 err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200383 return err;
384}
385
386static void fan_ctrl_free(struct gpio_fan_data *fan_data)
387{
388 struct platform_device *pdev = fan_data->pdev;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200389
390 sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_ctrl_group);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200391}
392
393/*
394 * Platform driver.
395 */
396
397static ssize_t show_name(struct device *dev,
398 struct device_attribute *attr, char *buf)
399{
400 return sprintf(buf, "gpio-fan\n");
401}
402
403static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
404
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100405
406#ifdef CONFIG_OF_GPIO
407/*
408 * Translate OpenFirmware node properties into platform_data
409 */
410static int gpio_fan_get_of_pdata(struct device *dev,
411 struct gpio_fan_platform_data *pdata)
412{
413 struct device_node *node;
414 struct gpio_fan_speed *speed;
415 unsigned *ctrl;
416 unsigned i;
417 u32 u;
418 struct property *prop;
419 const __be32 *p;
420
421 node = dev->of_node;
422
423 /* Fill GPIO pin array */
424 pdata->num_ctrl = of_gpio_count(node);
Grant Likelye80beb22013-02-12 17:48:37 +0000425 if (pdata->num_ctrl <= 0) {
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100426 dev_err(dev, "gpios DT property empty / missing");
427 return -ENODEV;
428 }
429 ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned),
430 GFP_KERNEL);
431 if (!ctrl)
432 return -ENOMEM;
433 for (i = 0; i < pdata->num_ctrl; i++) {
434 int val;
435
436 val = of_get_gpio(node, i);
437 if (val < 0)
438 return val;
439 ctrl[i] = val;
440 }
441 pdata->ctrl = ctrl;
442
443 /* Get number of RPM/ctrl_val pairs in speed map */
444 prop = of_find_property(node, "gpio-fan,speed-map", &i);
445 if (!prop) {
446 dev_err(dev, "gpio-fan,speed-map DT property missing");
447 return -ENODEV;
448 }
449 i = i / sizeof(u32);
450 if (i == 0 || i & 1) {
451 dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries");
452 return -ENODEV;
453 }
454 pdata->num_speed = i / 2;
455
456 /*
457 * Populate speed map
458 * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...>
459 * this needs splitting into pairs to create gpio_fan_speed structs
460 */
461 speed = devm_kzalloc(dev,
462 pdata->num_speed * sizeof(struct gpio_fan_speed),
463 GFP_KERNEL);
464 if (!speed)
465 return -ENOMEM;
466 p = NULL;
467 for (i = 0; i < pdata->num_speed; i++) {
468 p = of_prop_next_u32(prop, p, &u);
469 if (!p)
470 return -ENODEV;
471 speed[i].rpm = u;
472 p = of_prop_next_u32(prop, p, &u);
473 if (!p)
474 return -ENODEV;
475 speed[i].ctrl_val = u;
476 }
477 pdata->speed = speed;
478
479 /* Alarm GPIO if one exists */
Grant Likelye80beb22013-02-12 17:48:37 +0000480 if (of_gpio_named_count(node, "alarm-gpios") > 0) {
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100481 struct gpio_fan_alarm *alarm;
482 int val;
483 enum of_gpio_flags flags;
484
485 alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm),
486 GFP_KERNEL);
487 if (!alarm)
488 return -ENOMEM;
489
490 val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags);
491 if (val < 0)
492 return val;
493 alarm->gpio = val;
494 alarm->active_low = flags & OF_GPIO_ACTIVE_LOW;
495
496 pdata->alarm = alarm;
497 }
498
499 return 0;
500}
501
Bill Pembertona5977242012-11-19 13:24:37 -0500502static struct of_device_id of_gpio_fan_match[] = {
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100503 { .compatible = "gpio-fan", },
504 {},
505};
506#endif /* CONFIG_OF_GPIO */
507
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500508static int gpio_fan_probe(struct platform_device *pdev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200509{
510 int err;
511 struct gpio_fan_data *fan_data;
512 struct gpio_fan_platform_data *pdata = pdev->dev.platform_data;
513
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100514#ifdef CONFIG_OF_GPIO
515 if (!pdata) {
516 pdata = devm_kzalloc(&pdev->dev,
517 sizeof(struct gpio_fan_platform_data),
518 GFP_KERNEL);
519 if (!pdata)
520 return -ENOMEM;
521
522 err = gpio_fan_get_of_pdata(&pdev->dev, pdata);
523 if (err)
524 return err;
525 }
526#else /* CONFIG_OF_GPIO */
Simon Guinotd6fe1362010-10-22 00:44:19 +0200527 if (!pdata)
528 return -EINVAL;
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100529#endif /* CONFIG_OF_GPIO */
Simon Guinotd6fe1362010-10-22 00:44:19 +0200530
Guenter Roeckd00985f2012-06-02 09:58:07 -0700531 fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data),
532 GFP_KERNEL);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200533 if (!fan_data)
534 return -ENOMEM;
535
536 fan_data->pdev = pdev;
537 platform_set_drvdata(pdev, fan_data);
538 mutex_init(&fan_data->lock);
539
540 /* Configure alarm GPIO if available. */
541 if (pdata->alarm) {
542 err = fan_alarm_init(fan_data, pdata->alarm);
543 if (err)
Guenter Roeckd00985f2012-06-02 09:58:07 -0700544 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200545 }
546
547 /* Configure control GPIOs if available. */
548 if (pdata->ctrl && pdata->num_ctrl > 0) {
549 if (!pdata->speed || pdata->num_speed <= 1) {
550 err = -EINVAL;
551 goto err_free_alarm;
552 }
553 err = fan_ctrl_init(fan_data, pdata);
554 if (err)
555 goto err_free_alarm;
556 }
557
558 err = device_create_file(&pdev->dev, &dev_attr_name);
559 if (err)
560 goto err_free_ctrl;
561
562 /* Make this driver part of hwmon class. */
563 fan_data->hwmon_dev = hwmon_device_register(&pdev->dev);
564 if (IS_ERR(fan_data->hwmon_dev)) {
565 err = PTR_ERR(fan_data->hwmon_dev);
566 goto err_remove_name;
567 }
568
569 dev_info(&pdev->dev, "GPIO fan initialized\n");
570
571 return 0;
572
573err_remove_name:
574 device_remove_file(&pdev->dev, &dev_attr_name);
575err_free_ctrl:
576 if (fan_data->ctrl)
577 fan_ctrl_free(fan_data);
578err_free_alarm:
579 if (fan_data->alarm)
580 fan_alarm_free(fan_data);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200581 return err;
582}
583
Bill Pemberton281dfd02012-11-19 13:25:51 -0500584static int gpio_fan_remove(struct platform_device *pdev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200585{
586 struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
587
588 hwmon_device_unregister(fan_data->hwmon_dev);
589 device_remove_file(&pdev->dev, &dev_attr_name);
590 if (fan_data->alarm)
591 fan_alarm_free(fan_data);
592 if (fan_data->ctrl)
593 fan_ctrl_free(fan_data);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200594
595 return 0;
596}
597
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200598#ifdef CONFIG_PM_SLEEP
599static int gpio_fan_suspend(struct device *dev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200600{
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200601 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200602
603 if (fan_data->ctrl) {
604 fan_data->resume_speed = fan_data->speed_index;
605 set_fan_speed(fan_data, 0);
606 }
607
608 return 0;
609}
610
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200611static int gpio_fan_resume(struct device *dev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200612{
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200613 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200614
615 if (fan_data->ctrl)
616 set_fan_speed(fan_data, fan_data->resume_speed);
617
618 return 0;
619}
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200620
621static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
622#define GPIO_FAN_PM &gpio_fan_pm
Simon Guinotd6fe1362010-10-22 00:44:19 +0200623#else
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200624#define GPIO_FAN_PM NULL
Simon Guinotd6fe1362010-10-22 00:44:19 +0200625#endif
626
627static struct platform_driver gpio_fan_driver = {
628 .probe = gpio_fan_probe,
Bill Pemberton9e5e9b72012-11-19 13:21:20 -0500629 .remove = gpio_fan_remove,
Simon Guinotd6fe1362010-10-22 00:44:19 +0200630 .driver = {
631 .name = "gpio-fan",
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200632 .pm = GPIO_FAN_PM,
Jamie Lentineaa7cc62012-11-01 23:55:43 +0000633#ifdef CONFIG_OF_GPIO
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100634 .of_match_table = of_match_ptr(of_gpio_fan_match),
Jamie Lentineaa7cc62012-11-01 23:55:43 +0000635#endif
Simon Guinotd6fe1362010-10-22 00:44:19 +0200636 },
637};
638
Axel Lin25a236a2011-11-25 02:31:00 -0500639module_platform_driver(gpio_fan_driver);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200640
641MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
642MODULE_DESCRIPTION("GPIO FAN driver");
643MODULE_LICENSE("GPL");
644MODULE_ALIAS("platform:gpio-fan");