blob: 36abf814b8c77c57c0728beda6afac69b92cc802 [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>
Sachin Kamatc50588a2013-09-27 16:56:00 +053034#include <linux/of.h>
Jamie Lentin55fb8b062012-09-14 17:07:06 +010035#include <linux/of_platform.h>
36#include <linux/of_gpio.h>
Simon Guinotd6fe1362010-10-22 00:44:19 +020037
38struct gpio_fan_data {
39 struct platform_device *pdev;
40 struct device *hwmon_dev;
41 struct mutex lock; /* lock GPIOs operations. */
42 int num_ctrl;
43 unsigned *ctrl;
44 int num_speed;
45 struct gpio_fan_speed *speed;
46 int speed_index;
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +020047#ifdef CONFIG_PM_SLEEP
Simon Guinotd6fe1362010-10-22 00:44:19 +020048 int resume_speed;
49#endif
50 bool pwm_enable;
51 struct gpio_fan_alarm *alarm;
52 struct work_struct alarm_work;
53};
54
55/*
56 * Alarm GPIO.
57 */
58
59static void fan_alarm_notify(struct work_struct *ws)
60{
61 struct gpio_fan_data *fan_data =
62 container_of(ws, struct gpio_fan_data, alarm_work);
63
64 sysfs_notify(&fan_data->pdev->dev.kobj, NULL, "fan1_alarm");
65 kobject_uevent(&fan_data->pdev->dev.kobj, KOBJ_CHANGE);
66}
67
68static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id)
69{
70 struct gpio_fan_data *fan_data = dev_id;
71
72 schedule_work(&fan_data->alarm_work);
73
74 return IRQ_NONE;
75}
76
77static ssize_t show_fan_alarm(struct device *dev,
78 struct device_attribute *attr, char *buf)
79{
80 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
81 struct gpio_fan_alarm *alarm = fan_data->alarm;
Nishanth Menon52a95c12014-12-04 10:58:47 -060082 int value = gpio_get_value_cansleep(alarm->gpio);
Simon Guinotd6fe1362010-10-22 00:44:19 +020083
84 if (alarm->active_low)
85 value = !value;
86
87 return sprintf(buf, "%d\n", value);
88}
89
90static DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL);
91
92static int fan_alarm_init(struct gpio_fan_data *fan_data,
93 struct gpio_fan_alarm *alarm)
94{
95 int err;
96 int alarm_irq;
97 struct platform_device *pdev = fan_data->pdev;
98
99 fan_data->alarm = alarm;
100
Guenter Roeckd00985f2012-06-02 09:58:07 -0700101 err = devm_gpio_request(&pdev->dev, alarm->gpio, "GPIO fan alarm");
Simon Guinotd6fe1362010-10-22 00:44:19 +0200102 if (err)
103 return err;
104
105 err = gpio_direction_input(alarm->gpio);
106 if (err)
Guenter Roeckd00985f2012-06-02 09:58:07 -0700107 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200108
Simon Guinotd6fe1362010-10-22 00:44:19 +0200109 /*
110 * If the alarm GPIO don't support interrupts, just leave
111 * without initializing the fail notification support.
112 */
113 alarm_irq = gpio_to_irq(alarm->gpio);
114 if (alarm_irq < 0)
115 return 0;
116
117 INIT_WORK(&fan_data->alarm_work, fan_alarm_notify);
Thomas Gleixnerdced35a2011-03-28 17:49:12 +0200118 irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
Guenter Roeckd00985f2012-06-02 09:58:07 -0700119 err = devm_request_irq(&pdev->dev, alarm_irq, fan_alarm_irq_handler,
120 IRQF_SHARED, "GPIO fan alarm", fan_data);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200121 return err;
122}
123
Simon Guinotd6fe1362010-10-22 00:44:19 +0200124/*
125 * Control GPIOs.
126 */
127
128/* Must be called with fan_data->lock held, except during initialization. */
129static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
130{
131 int i;
132
133 for (i = 0; i < fan_data->num_ctrl; i++)
Nishanth Menon52a95c12014-12-04 10:58:47 -0600134 gpio_set_value_cansleep(fan_data->ctrl[i], (ctrl_val >> i) & 1);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200135}
136
137static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
138{
139 int i;
140 int ctrl_val = 0;
141
142 for (i = 0; i < fan_data->num_ctrl; i++) {
143 int value;
144
Nishanth Menon52a95c12014-12-04 10:58:47 -0600145 value = gpio_get_value_cansleep(fan_data->ctrl[i]);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200146 ctrl_val |= (value << i);
147 }
148 return ctrl_val;
149}
150
151/* Must be called with fan_data->lock held, except during initialization. */
152static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index)
153{
154 if (fan_data->speed_index == speed_index)
155 return;
156
157 __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val);
158 fan_data->speed_index = speed_index;
159}
160
161static int get_fan_speed_index(struct gpio_fan_data *fan_data)
162{
163 int ctrl_val = __get_fan_ctrl(fan_data);
164 int i;
165
166 for (i = 0; i < fan_data->num_speed; i++)
167 if (fan_data->speed[i].ctrl_val == ctrl_val)
168 return i;
169
170 dev_warn(&fan_data->pdev->dev,
171 "missing speed array entry for GPIO value 0x%x\n", ctrl_val);
172
Guenter Roeckc52ae3d2013-09-13 10:42:39 -0700173 return -ENODEV;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200174}
175
Axel Lin2565fb02014-08-02 13:36:38 +0800176static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200177{
178 struct gpio_fan_speed *speed = fan_data->speed;
179 int i;
180
181 for (i = 0; i < fan_data->num_speed; i++)
182 if (speed[i].rpm >= rpm)
183 return i;
184
185 return fan_data->num_speed - 1;
186}
187
188static ssize_t show_pwm(struct device *dev,
189 struct device_attribute *attr, char *buf)
190{
191 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
192 u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1);
193
194 return sprintf(buf, "%d\n", pwm);
195}
196
197static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
198 const char *buf, size_t count)
199{
200 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
201 unsigned long pwm;
202 int speed_index;
203 int ret = count;
204
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100205 if (kstrtoul(buf, 10, &pwm) || pwm > 255)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200206 return -EINVAL;
207
208 mutex_lock(&fan_data->lock);
209
210 if (!fan_data->pwm_enable) {
211 ret = -EPERM;
212 goto exit_unlock;
213 }
214
215 speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255);
216 set_fan_speed(fan_data, speed_index);
217
218exit_unlock:
219 mutex_unlock(&fan_data->lock);
220
221 return ret;
222}
223
224static ssize_t show_pwm_enable(struct device *dev,
225 struct device_attribute *attr, char *buf)
226{
227 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
228
229 return sprintf(buf, "%d\n", fan_data->pwm_enable);
230}
231
232static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr,
233 const char *buf, size_t count)
234{
235 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
236 unsigned long val;
237
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100238 if (kstrtoul(buf, 10, &val) || val > 1)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200239 return -EINVAL;
240
241 if (fan_data->pwm_enable == val)
242 return count;
243
244 mutex_lock(&fan_data->lock);
245
246 fan_data->pwm_enable = val;
247
248 /* Disable manual control mode: set fan at full speed. */
249 if (val == 0)
250 set_fan_speed(fan_data, fan_data->num_speed - 1);
251
252 mutex_unlock(&fan_data->lock);
253
254 return count;
255}
256
257static ssize_t show_pwm_mode(struct device *dev,
258 struct device_attribute *attr, char *buf)
259{
260 return sprintf(buf, "0\n");
261}
262
263static ssize_t show_rpm_min(struct device *dev,
264 struct device_attribute *attr, char *buf)
265{
266 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
267
268 return sprintf(buf, "%d\n", fan_data->speed[0].rpm);
269}
270
271static ssize_t show_rpm_max(struct device *dev,
272 struct device_attribute *attr, char *buf)
273{
274 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
275
276 return sprintf(buf, "%d\n",
277 fan_data->speed[fan_data->num_speed - 1].rpm);
278}
279
280static ssize_t show_rpm(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[fan_data->speed_index].rpm);
286}
287
288static ssize_t set_rpm(struct device *dev, struct device_attribute *attr,
289 const char *buf, size_t count)
290{
291 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
292 unsigned long rpm;
293 int ret = count;
294
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100295 if (kstrtoul(buf, 10, &rpm))
Simon Guinotd6fe1362010-10-22 00:44:19 +0200296 return -EINVAL;
297
298 mutex_lock(&fan_data->lock);
299
300 if (!fan_data->pwm_enable) {
301 ret = -EPERM;
302 goto exit_unlock;
303 }
304
305 set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm));
306
307exit_unlock:
308 mutex_unlock(&fan_data->lock);
309
310 return ret;
311}
312
313static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm);
314static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
315 show_pwm_enable, set_pwm_enable);
316static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL);
317static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL);
318static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL);
319static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL);
320static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm);
321
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700322static umode_t gpio_fan_is_visible(struct kobject *kobj,
323 struct attribute *attr, int index)
324{
325 struct device *dev = container_of(kobj, struct device, kobj);
326 struct gpio_fan_data *data = dev_get_drvdata(dev);
327
Guenter Roeck7258a122013-07-06 09:46:14 -0700328 if (index == 0 && !data->alarm)
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700329 return 0;
Guenter Roeck7258a122013-07-06 09:46:14 -0700330 if (index > 0 && !data->ctrl)
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700331 return 0;
332
333 return attr->mode;
334}
335
336static struct attribute *gpio_fan_attributes[] = {
Guenter Roeck7258a122013-07-06 09:46:14 -0700337 &dev_attr_fan1_alarm.attr, /* 0 */
338 &dev_attr_pwm1.attr, /* 1 */
Simon Guinotd6fe1362010-10-22 00:44:19 +0200339 &dev_attr_pwm1_enable.attr,
340 &dev_attr_pwm1_mode.attr,
341 &dev_attr_fan1_input.attr,
342 &dev_attr_fan1_target.attr,
343 &dev_attr_fan1_min.attr,
344 &dev_attr_fan1_max.attr,
345 NULL
346};
347
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700348static const struct attribute_group gpio_fan_group = {
349 .attrs = gpio_fan_attributes,
350 .is_visible = gpio_fan_is_visible,
Simon Guinotd6fe1362010-10-22 00:44:19 +0200351};
352
Guenter Roeck7258a122013-07-06 09:46:14 -0700353static const struct attribute_group *gpio_fan_groups[] = {
354 &gpio_fan_group,
355 NULL
356};
357
Simon Guinotd6fe1362010-10-22 00:44:19 +0200358static int fan_ctrl_init(struct gpio_fan_data *fan_data,
359 struct gpio_fan_platform_data *pdata)
360{
361 struct platform_device *pdev = fan_data->pdev;
362 int num_ctrl = pdata->num_ctrl;
363 unsigned *ctrl = pdata->ctrl;
364 int i, err;
365
366 for (i = 0; i < num_ctrl; i++) {
Guenter Roeckd00985f2012-06-02 09:58:07 -0700367 err = devm_gpio_request(&pdev->dev, ctrl[i],
368 "GPIO fan control");
Simon Guinotd6fe1362010-10-22 00:44:19 +0200369 if (err)
Guenter Roeckd00985f2012-06-02 09:58:07 -0700370 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200371
Nishanth Menon52a95c12014-12-04 10:58:47 -0600372 err = gpio_direction_output(ctrl[i],
373 gpio_get_value_cansleep(ctrl[i]));
Guenter Roeckd00985f2012-06-02 09:58:07 -0700374 if (err)
375 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200376 }
377
Simon Guinotd6fe1362010-10-22 00:44:19 +0200378 fan_data->num_ctrl = num_ctrl;
379 fan_data->ctrl = ctrl;
380 fan_data->num_speed = pdata->num_speed;
381 fan_data->speed = pdata->speed;
382 fan_data->pwm_enable = true; /* Enable manual fan speed control. */
383 fan_data->speed_index = get_fan_speed_index(fan_data);
Guenter Roeckd00985f2012-06-02 09:58:07 -0700384 if (fan_data->speed_index < 0)
Guenter Roeckc52ae3d2013-09-13 10:42:39 -0700385 return fan_data->speed_index;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200386
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700387 return 0;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200388}
389
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100390#ifdef CONFIG_OF_GPIO
391/*
392 * Translate OpenFirmware node properties into platform_data
393 */
394static int gpio_fan_get_of_pdata(struct device *dev,
395 struct gpio_fan_platform_data *pdata)
396{
397 struct device_node *node;
398 struct gpio_fan_speed *speed;
399 unsigned *ctrl;
400 unsigned i;
401 u32 u;
402 struct property *prop;
403 const __be32 *p;
404
405 node = dev->of_node;
406
407 /* Fill GPIO pin array */
408 pdata->num_ctrl = of_gpio_count(node);
Grant Likelye80beb22013-02-12 17:48:37 +0000409 if (pdata->num_ctrl <= 0) {
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100410 dev_err(dev, "gpios DT property empty / missing");
411 return -ENODEV;
412 }
413 ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned),
414 GFP_KERNEL);
415 if (!ctrl)
416 return -ENOMEM;
417 for (i = 0; i < pdata->num_ctrl; i++) {
418 int val;
419
420 val = of_get_gpio(node, i);
421 if (val < 0)
422 return val;
423 ctrl[i] = val;
424 }
425 pdata->ctrl = ctrl;
426
427 /* Get number of RPM/ctrl_val pairs in speed map */
428 prop = of_find_property(node, "gpio-fan,speed-map", &i);
429 if (!prop) {
430 dev_err(dev, "gpio-fan,speed-map DT property missing");
431 return -ENODEV;
432 }
433 i = i / sizeof(u32);
434 if (i == 0 || i & 1) {
435 dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries");
436 return -ENODEV;
437 }
438 pdata->num_speed = i / 2;
439
440 /*
441 * Populate speed map
442 * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...>
443 * this needs splitting into pairs to create gpio_fan_speed structs
444 */
445 speed = devm_kzalloc(dev,
446 pdata->num_speed * sizeof(struct gpio_fan_speed),
447 GFP_KERNEL);
448 if (!speed)
449 return -ENOMEM;
450 p = NULL;
451 for (i = 0; i < pdata->num_speed; i++) {
452 p = of_prop_next_u32(prop, p, &u);
453 if (!p)
454 return -ENODEV;
455 speed[i].rpm = u;
456 p = of_prop_next_u32(prop, p, &u);
457 if (!p)
458 return -ENODEV;
459 speed[i].ctrl_val = u;
460 }
461 pdata->speed = speed;
462
463 /* Alarm GPIO if one exists */
Grant Likelye80beb22013-02-12 17:48:37 +0000464 if (of_gpio_named_count(node, "alarm-gpios") > 0) {
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100465 struct gpio_fan_alarm *alarm;
466 int val;
467 enum of_gpio_flags flags;
468
469 alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm),
470 GFP_KERNEL);
471 if (!alarm)
472 return -ENOMEM;
473
474 val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags);
475 if (val < 0)
476 return val;
477 alarm->gpio = val;
478 alarm->active_low = flags & OF_GPIO_ACTIVE_LOW;
479
480 pdata->alarm = alarm;
481 }
482
483 return 0;
484}
485
Jingoo Han6de709c2014-05-07 17:27:54 +0900486static const struct of_device_id of_gpio_fan_match[] = {
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100487 { .compatible = "gpio-fan", },
488 {},
489};
490#endif /* CONFIG_OF_GPIO */
491
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500492static int gpio_fan_probe(struct platform_device *pdev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200493{
494 int err;
495 struct gpio_fan_data *fan_data;
Jingoo Hana8b3a3a2013-07-30 17:13:06 +0900496 struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200497
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100498#ifdef CONFIG_OF_GPIO
499 if (!pdata) {
500 pdata = devm_kzalloc(&pdev->dev,
501 sizeof(struct gpio_fan_platform_data),
502 GFP_KERNEL);
503 if (!pdata)
504 return -ENOMEM;
505
506 err = gpio_fan_get_of_pdata(&pdev->dev, pdata);
507 if (err)
508 return err;
509 }
510#else /* CONFIG_OF_GPIO */
Simon Guinotd6fe1362010-10-22 00:44:19 +0200511 if (!pdata)
512 return -EINVAL;
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100513#endif /* CONFIG_OF_GPIO */
Simon Guinotd6fe1362010-10-22 00:44:19 +0200514
Guenter Roeckd00985f2012-06-02 09:58:07 -0700515 fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data),
516 GFP_KERNEL);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200517 if (!fan_data)
518 return -ENOMEM;
519
520 fan_data->pdev = pdev;
521 platform_set_drvdata(pdev, fan_data);
522 mutex_init(&fan_data->lock);
523
524 /* Configure alarm GPIO if available. */
525 if (pdata->alarm) {
526 err = fan_alarm_init(fan_data, pdata->alarm);
527 if (err)
Guenter Roeckd00985f2012-06-02 09:58:07 -0700528 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200529 }
530
531 /* Configure control GPIOs if available. */
532 if (pdata->ctrl && pdata->num_ctrl > 0) {
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700533 if (!pdata->speed || pdata->num_speed <= 1)
534 return -EINVAL;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200535 err = fan_ctrl_init(fan_data, pdata);
536 if (err)
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700537 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200538 }
539
Simon Guinotd6fe1362010-10-22 00:44:19 +0200540 /* Make this driver part of hwmon class. */
Axel Lin49153b02014-06-14 14:50:50 +0800541 fan_data->hwmon_dev =
542 devm_hwmon_device_register_with_groups(&pdev->dev,
543 "gpio_fan", fan_data,
544 gpio_fan_groups);
Guenter Roeck7258a122013-07-06 09:46:14 -0700545 if (IS_ERR(fan_data->hwmon_dev))
546 return PTR_ERR(fan_data->hwmon_dev);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200547
548 dev_info(&pdev->dev, "GPIO fan initialized\n");
549
550 return 0;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200551}
552
Nishanth Menonb95579c2014-12-04 10:58:56 -0600553static void gpio_fan_shutdown(struct platform_device *pdev)
554{
555 struct gpio_fan_data *fan_data = dev_get_drvdata(&pdev->dev);
556
557 if (fan_data->ctrl)
558 set_fan_speed(fan_data, 0);
559}
560
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200561#ifdef CONFIG_PM_SLEEP
562static int gpio_fan_suspend(struct device *dev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200563{
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200564 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200565
566 if (fan_data->ctrl) {
567 fan_data->resume_speed = fan_data->speed_index;
568 set_fan_speed(fan_data, 0);
569 }
570
571 return 0;
572}
573
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200574static int gpio_fan_resume(struct device *dev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200575{
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200576 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200577
578 if (fan_data->ctrl)
579 set_fan_speed(fan_data, fan_data->resume_speed);
580
581 return 0;
582}
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200583
584static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
Guenter Roeck24f9c532013-01-10 05:54:40 -0800585#define GPIO_FAN_PM (&gpio_fan_pm)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200586#else
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200587#define GPIO_FAN_PM NULL
Simon Guinotd6fe1362010-10-22 00:44:19 +0200588#endif
589
590static struct platform_driver gpio_fan_driver = {
591 .probe = gpio_fan_probe,
Nishanth Menonb95579c2014-12-04 10:58:56 -0600592 .shutdown = gpio_fan_shutdown,
Simon Guinotd6fe1362010-10-22 00:44:19 +0200593 .driver = {
594 .name = "gpio-fan",
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200595 .pm = GPIO_FAN_PM,
Jamie Lentineaa7cc62012-11-01 23:55:43 +0000596#ifdef CONFIG_OF_GPIO
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100597 .of_match_table = of_match_ptr(of_gpio_fan_match),
Jamie Lentineaa7cc62012-11-01 23:55:43 +0000598#endif
Simon Guinotd6fe1362010-10-22 00:44:19 +0200599 },
600};
601
Axel Lin25a236a2011-11-25 02:31:00 -0500602module_platform_driver(gpio_fan_driver);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200603
604MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
605MODULE_DESCRIPTION("GPIO FAN driver");
606MODULE_LICENSE("GPL");
607MODULE_ALIAS("platform:gpio-fan");