blob: b7d6a5704eb2ff15887f77341e8d8b2e57cdb291 [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
Simon Guinotd6fe1362010-10-22 00:44:19 +0200108 /*
109 * If the alarm GPIO don't support interrupts, just leave
110 * without initializing the fail notification support.
111 */
112 alarm_irq = gpio_to_irq(alarm->gpio);
113 if (alarm_irq < 0)
114 return 0;
115
116 INIT_WORK(&fan_data->alarm_work, fan_alarm_notify);
Thomas Gleixnerdced35a2011-03-28 17:49:12 +0200117 irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
Guenter Roeckd00985f2012-06-02 09:58:07 -0700118 err = devm_request_irq(&pdev->dev, alarm_irq, fan_alarm_irq_handler,
119 IRQF_SHARED, "GPIO fan alarm", fan_data);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200120 return err;
121}
122
Simon Guinotd6fe1362010-10-22 00:44:19 +0200123/*
124 * Control GPIOs.
125 */
126
127/* Must be called with fan_data->lock held, except during initialization. */
128static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
129{
130 int i;
131
132 for (i = 0; i < fan_data->num_ctrl; i++)
133 gpio_set_value(fan_data->ctrl[i], (ctrl_val >> i) & 1);
134}
135
136static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
137{
138 int i;
139 int ctrl_val = 0;
140
141 for (i = 0; i < fan_data->num_ctrl; i++) {
142 int value;
143
144 value = gpio_get_value(fan_data->ctrl[i]);
145 ctrl_val |= (value << i);
146 }
147 return ctrl_val;
148}
149
150/* Must be called with fan_data->lock held, except during initialization. */
151static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index)
152{
153 if (fan_data->speed_index == speed_index)
154 return;
155
156 __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val);
157 fan_data->speed_index = speed_index;
158}
159
160static int get_fan_speed_index(struct gpio_fan_data *fan_data)
161{
162 int ctrl_val = __get_fan_ctrl(fan_data);
163 int i;
164
165 for (i = 0; i < fan_data->num_speed; i++)
166 if (fan_data->speed[i].ctrl_val == ctrl_val)
167 return i;
168
169 dev_warn(&fan_data->pdev->dev,
170 "missing speed array entry for GPIO value 0x%x\n", ctrl_val);
171
172 return -EINVAL;
173}
174
175static int rpm_to_speed_index(struct gpio_fan_data *fan_data, int rpm)
176{
177 struct gpio_fan_speed *speed = fan_data->speed;
178 int i;
179
180 for (i = 0; i < fan_data->num_speed; i++)
181 if (speed[i].rpm >= rpm)
182 return i;
183
184 return fan_data->num_speed - 1;
185}
186
187static ssize_t show_pwm(struct device *dev,
188 struct device_attribute *attr, char *buf)
189{
190 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
191 u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1);
192
193 return sprintf(buf, "%d\n", pwm);
194}
195
196static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
197 const char *buf, size_t count)
198{
199 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
200 unsigned long pwm;
201 int speed_index;
202 int ret = count;
203
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100204 if (kstrtoul(buf, 10, &pwm) || pwm > 255)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200205 return -EINVAL;
206
207 mutex_lock(&fan_data->lock);
208
209 if (!fan_data->pwm_enable) {
210 ret = -EPERM;
211 goto exit_unlock;
212 }
213
214 speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255);
215 set_fan_speed(fan_data, speed_index);
216
217exit_unlock:
218 mutex_unlock(&fan_data->lock);
219
220 return ret;
221}
222
223static ssize_t show_pwm_enable(struct device *dev,
224 struct device_attribute *attr, char *buf)
225{
226 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
227
228 return sprintf(buf, "%d\n", fan_data->pwm_enable);
229}
230
231static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr,
232 const char *buf, size_t count)
233{
234 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
235 unsigned long val;
236
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100237 if (kstrtoul(buf, 10, &val) || val > 1)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200238 return -EINVAL;
239
240 if (fan_data->pwm_enable == val)
241 return count;
242
243 mutex_lock(&fan_data->lock);
244
245 fan_data->pwm_enable = val;
246
247 /* Disable manual control mode: set fan at full speed. */
248 if (val == 0)
249 set_fan_speed(fan_data, fan_data->num_speed - 1);
250
251 mutex_unlock(&fan_data->lock);
252
253 return count;
254}
255
256static ssize_t show_pwm_mode(struct device *dev,
257 struct device_attribute *attr, char *buf)
258{
259 return sprintf(buf, "0\n");
260}
261
262static ssize_t show_rpm_min(struct device *dev,
263 struct device_attribute *attr, char *buf)
264{
265 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
266
267 return sprintf(buf, "%d\n", fan_data->speed[0].rpm);
268}
269
270static ssize_t show_rpm_max(struct device *dev,
271 struct device_attribute *attr, char *buf)
272{
273 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
274
275 return sprintf(buf, "%d\n",
276 fan_data->speed[fan_data->num_speed - 1].rpm);
277}
278
279static ssize_t show_rpm(struct device *dev,
280 struct device_attribute *attr, char *buf)
281{
282 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
283
284 return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm);
285}
286
287static ssize_t set_rpm(struct device *dev, struct device_attribute *attr,
288 const char *buf, size_t count)
289{
290 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
291 unsigned long rpm;
292 int ret = count;
293
Frans Meulenbroeks179c4fd2012-01-04 20:58:52 +0100294 if (kstrtoul(buf, 10, &rpm))
Simon Guinotd6fe1362010-10-22 00:44:19 +0200295 return -EINVAL;
296
297 mutex_lock(&fan_data->lock);
298
299 if (!fan_data->pwm_enable) {
300 ret = -EPERM;
301 goto exit_unlock;
302 }
303
304 set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm));
305
306exit_unlock:
307 mutex_unlock(&fan_data->lock);
308
309 return ret;
310}
311
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700312static ssize_t show_name(struct device *dev,
313 struct device_attribute *attr, char *buf)
314{
315 return sprintf(buf, "gpio-fan\n");
316}
317
Simon Guinotd6fe1362010-10-22 00:44:19 +0200318static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm);
319static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
320 show_pwm_enable, set_pwm_enable);
321static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL);
322static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL);
323static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL);
324static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL);
325static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm);
326
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700327static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
328
329static umode_t gpio_fan_is_visible(struct kobject *kobj,
330 struct attribute *attr, int index)
331{
332 struct device *dev = container_of(kobj, struct device, kobj);
333 struct gpio_fan_data *data = dev_get_drvdata(dev);
334
335 if (index == 1 && !data->alarm)
336 return 0;
337 if (index > 1 && !data->ctrl)
338 return 0;
339
340 return attr->mode;
341}
342
343static struct attribute *gpio_fan_attributes[] = {
344 &dev_attr_name.attr,
345 &dev_attr_fan1_alarm.attr, /* 1 */
346 &dev_attr_pwm1.attr, /* 2 */
Simon Guinotd6fe1362010-10-22 00:44:19 +0200347 &dev_attr_pwm1_enable.attr,
348 &dev_attr_pwm1_mode.attr,
349 &dev_attr_fan1_input.attr,
350 &dev_attr_fan1_target.attr,
351 &dev_attr_fan1_min.attr,
352 &dev_attr_fan1_max.attr,
353 NULL
354};
355
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700356static const struct attribute_group gpio_fan_group = {
357 .attrs = gpio_fan_attributes,
358 .is_visible = gpio_fan_is_visible,
Simon Guinotd6fe1362010-10-22 00:44:19 +0200359};
360
361static int fan_ctrl_init(struct gpio_fan_data *fan_data,
362 struct gpio_fan_platform_data *pdata)
363{
364 struct platform_device *pdev = fan_data->pdev;
365 int num_ctrl = pdata->num_ctrl;
366 unsigned *ctrl = pdata->ctrl;
367 int i, err;
368
369 for (i = 0; i < num_ctrl; i++) {
Guenter Roeckd00985f2012-06-02 09:58:07 -0700370 err = devm_gpio_request(&pdev->dev, ctrl[i],
371 "GPIO fan control");
Simon Guinotd6fe1362010-10-22 00:44:19 +0200372 if (err)
Guenter Roeckd00985f2012-06-02 09:58:07 -0700373 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200374
375 err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i]));
Guenter Roeckd00985f2012-06-02 09:58:07 -0700376 if (err)
377 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200378 }
379
Simon Guinotd6fe1362010-10-22 00:44:19 +0200380 fan_data->num_ctrl = num_ctrl;
381 fan_data->ctrl = ctrl;
382 fan_data->num_speed = pdata->num_speed;
383 fan_data->speed = pdata->speed;
384 fan_data->pwm_enable = true; /* Enable manual fan speed control. */
385 fan_data->speed_index = get_fan_speed_index(fan_data);
Guenter Roeckd00985f2012-06-02 09:58:07 -0700386 if (fan_data->speed_index < 0)
387 return -ENODEV;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200388
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700389 return 0;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200390}
391
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100392#ifdef CONFIG_OF_GPIO
393/*
394 * Translate OpenFirmware node properties into platform_data
395 */
396static int gpio_fan_get_of_pdata(struct device *dev,
397 struct gpio_fan_platform_data *pdata)
398{
399 struct device_node *node;
400 struct gpio_fan_speed *speed;
401 unsigned *ctrl;
402 unsigned i;
403 u32 u;
404 struct property *prop;
405 const __be32 *p;
406
407 node = dev->of_node;
408
409 /* Fill GPIO pin array */
410 pdata->num_ctrl = of_gpio_count(node);
Grant Likelye80beb22013-02-12 17:48:37 +0000411 if (pdata->num_ctrl <= 0) {
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100412 dev_err(dev, "gpios DT property empty / missing");
413 return -ENODEV;
414 }
415 ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned),
416 GFP_KERNEL);
417 if (!ctrl)
418 return -ENOMEM;
419 for (i = 0; i < pdata->num_ctrl; i++) {
420 int val;
421
422 val = of_get_gpio(node, i);
423 if (val < 0)
424 return val;
425 ctrl[i] = val;
426 }
427 pdata->ctrl = ctrl;
428
429 /* Get number of RPM/ctrl_val pairs in speed map */
430 prop = of_find_property(node, "gpio-fan,speed-map", &i);
431 if (!prop) {
432 dev_err(dev, "gpio-fan,speed-map DT property missing");
433 return -ENODEV;
434 }
435 i = i / sizeof(u32);
436 if (i == 0 || i & 1) {
437 dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries");
438 return -ENODEV;
439 }
440 pdata->num_speed = i / 2;
441
442 /*
443 * Populate speed map
444 * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...>
445 * this needs splitting into pairs to create gpio_fan_speed structs
446 */
447 speed = devm_kzalloc(dev,
448 pdata->num_speed * sizeof(struct gpio_fan_speed),
449 GFP_KERNEL);
450 if (!speed)
451 return -ENOMEM;
452 p = NULL;
453 for (i = 0; i < pdata->num_speed; i++) {
454 p = of_prop_next_u32(prop, p, &u);
455 if (!p)
456 return -ENODEV;
457 speed[i].rpm = u;
458 p = of_prop_next_u32(prop, p, &u);
459 if (!p)
460 return -ENODEV;
461 speed[i].ctrl_val = u;
462 }
463 pdata->speed = speed;
464
465 /* Alarm GPIO if one exists */
Grant Likelye80beb22013-02-12 17:48:37 +0000466 if (of_gpio_named_count(node, "alarm-gpios") > 0) {
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100467 struct gpio_fan_alarm *alarm;
468 int val;
469 enum of_gpio_flags flags;
470
471 alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm),
472 GFP_KERNEL);
473 if (!alarm)
474 return -ENOMEM;
475
476 val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags);
477 if (val < 0)
478 return val;
479 alarm->gpio = val;
480 alarm->active_low = flags & OF_GPIO_ACTIVE_LOW;
481
482 pdata->alarm = alarm;
483 }
484
485 return 0;
486}
487
Bill Pembertona5977242012-11-19 13:24:37 -0500488static struct of_device_id of_gpio_fan_match[] = {
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100489 { .compatible = "gpio-fan", },
490 {},
491};
492#endif /* CONFIG_OF_GPIO */
493
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500494static int gpio_fan_probe(struct platform_device *pdev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200495{
496 int err;
497 struct gpio_fan_data *fan_data;
Jingoo Hana8b3a3a2013-07-30 17:13:06 +0900498 struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200499
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100500#ifdef CONFIG_OF_GPIO
501 if (!pdata) {
502 pdata = devm_kzalloc(&pdev->dev,
503 sizeof(struct gpio_fan_platform_data),
504 GFP_KERNEL);
505 if (!pdata)
506 return -ENOMEM;
507
508 err = gpio_fan_get_of_pdata(&pdev->dev, pdata);
509 if (err)
510 return err;
511 }
512#else /* CONFIG_OF_GPIO */
Simon Guinotd6fe1362010-10-22 00:44:19 +0200513 if (!pdata)
514 return -EINVAL;
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100515#endif /* CONFIG_OF_GPIO */
Simon Guinotd6fe1362010-10-22 00:44:19 +0200516
Guenter Roeckd00985f2012-06-02 09:58:07 -0700517 fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data),
518 GFP_KERNEL);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200519 if (!fan_data)
520 return -ENOMEM;
521
522 fan_data->pdev = pdev;
523 platform_set_drvdata(pdev, fan_data);
524 mutex_init(&fan_data->lock);
525
526 /* Configure alarm GPIO if available. */
527 if (pdata->alarm) {
528 err = fan_alarm_init(fan_data, pdata->alarm);
529 if (err)
Guenter Roeckd00985f2012-06-02 09:58:07 -0700530 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200531 }
532
533 /* Configure control GPIOs if available. */
534 if (pdata->ctrl && pdata->num_ctrl > 0) {
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700535 if (!pdata->speed || pdata->num_speed <= 1)
536 return -EINVAL;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200537 err = fan_ctrl_init(fan_data, pdata);
538 if (err)
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700539 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200540 }
541
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700542 err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_group);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200543 if (err)
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700544 return err;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200545
546 /* Make this driver part of hwmon class. */
547 fan_data->hwmon_dev = hwmon_device_register(&pdev->dev);
548 if (IS_ERR(fan_data->hwmon_dev)) {
549 err = PTR_ERR(fan_data->hwmon_dev);
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700550 goto err_remove;
Simon Guinotd6fe1362010-10-22 00:44:19 +0200551 }
552
553 dev_info(&pdev->dev, "GPIO fan initialized\n");
554
555 return 0;
556
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700557err_remove:
558 sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_group);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200559 return err;
560}
561
Bill Pemberton281dfd02012-11-19 13:25:51 -0500562static int gpio_fan_remove(struct platform_device *pdev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200563{
564 struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
565
566 hwmon_device_unregister(fan_data->hwmon_dev);
Guenter Roeckc81cc5a2013-03-30 09:09:39 -0700567 sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_group);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200568
569 return 0;
570}
571
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200572#ifdef CONFIG_PM_SLEEP
573static int gpio_fan_suspend(struct device *dev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200574{
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200575 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200576
577 if (fan_data->ctrl) {
578 fan_data->resume_speed = fan_data->speed_index;
579 set_fan_speed(fan_data, 0);
580 }
581
582 return 0;
583}
584
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200585static int gpio_fan_resume(struct device *dev)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200586{
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200587 struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200588
589 if (fan_data->ctrl)
590 set_fan_speed(fan_data, fan_data->resume_speed);
591
592 return 0;
593}
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200594
595static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
Guenter Roeck24f9c532013-01-10 05:54:40 -0800596#define GPIO_FAN_PM (&gpio_fan_pm)
Simon Guinotd6fe1362010-10-22 00:44:19 +0200597#else
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200598#define GPIO_FAN_PM NULL
Simon Guinotd6fe1362010-10-22 00:44:19 +0200599#endif
600
601static struct platform_driver gpio_fan_driver = {
602 .probe = gpio_fan_probe,
Bill Pemberton9e5e9b72012-11-19 13:21:20 -0500603 .remove = gpio_fan_remove,
Simon Guinotd6fe1362010-10-22 00:44:19 +0200604 .driver = {
605 .name = "gpio-fan",
Rafael J. Wysocki6d20a6c2012-07-08 00:01:03 +0200606 .pm = GPIO_FAN_PM,
Jamie Lentineaa7cc62012-11-01 23:55:43 +0000607#ifdef CONFIG_OF_GPIO
Jamie Lentin55fb8b062012-09-14 17:07:06 +0100608 .of_match_table = of_match_ptr(of_gpio_fan_match),
Jamie Lentineaa7cc62012-11-01 23:55:43 +0000609#endif
Simon Guinotd6fe1362010-10-22 00:44:19 +0200610 },
611};
612
Axel Lin25a236a2011-11-25 02:31:00 -0500613module_platform_driver(gpio_fan_driver);
Simon Guinotd6fe1362010-10-22 00:44:19 +0200614
615MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
616MODULE_DESCRIPTION("GPIO FAN driver");
617MODULE_LICENSE("GPL");
618MODULE_ALIAS("platform:gpio-fan");