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d6fe1360 SG |
1 | /* |
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> | |
c50588ab | 34 | #include <linux/of.h> |
55fb8b06 JL |
35 | #include <linux/of_platform.h> |
36 | #include <linux/of_gpio.h> | |
d6fe1360 SG |
37 | |
38 | struct 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; | |
6d20a6c0 | 47 | #ifdef CONFIG_PM_SLEEP |
d6fe1360 SG |
48 | 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 | ||
59 | static 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 | ||
68 | static 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 | ||
77 | static 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; | |
82 | int value = gpio_get_value(alarm->gpio); | |
83 | ||
84 | if (alarm->active_low) | |
85 | value = !value; | |
86 | ||
87 | return sprintf(buf, "%d\n", value); | |
88 | } | |
89 | ||
90 | static DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL); | |
91 | ||
92 | static 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 | ||
d00985f3 | 101 | err = devm_gpio_request(&pdev->dev, alarm->gpio, "GPIO fan alarm"); |
d6fe1360 SG |
102 | if (err) |
103 | return err; | |
104 | ||
105 | err = gpio_direction_input(alarm->gpio); | |
106 | if (err) | |
d00985f3 | 107 | return err; |
d6fe1360 | 108 | |
d6fe1360 SG |
109 | /* |
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); | |
dced35ae | 118 | irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH); |
d00985f3 GR |
119 | err = devm_request_irq(&pdev->dev, alarm_irq, fan_alarm_irq_handler, |
120 | IRQF_SHARED, "GPIO fan alarm", fan_data); | |
d6fe1360 SG |
121 | return err; |
122 | } | |
123 | ||
d6fe1360 SG |
124 | /* |
125 | * Control GPIOs. | |
126 | */ | |
127 | ||
128 | /* Must be called with fan_data->lock held, except during initialization. */ | |
129 | static 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++) | |
134 | gpio_set_value(fan_data->ctrl[i], (ctrl_val >> i) & 1); | |
135 | } | |
136 | ||
137 | static 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 | ||
145 | value = gpio_get_value(fan_data->ctrl[i]); | |
146 | ctrl_val |= (value << i); | |
147 | } | |
148 | return ctrl_val; | |
149 | } | |
150 | ||
151 | /* Must be called with fan_data->lock held, except during initialization. */ | |
152 | static 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 | ||
161 | static 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 | ||
c52ae3d2 | 173 | return -ENODEV; |
d6fe1360 SG |
174 | } |
175 | ||
176 | static int rpm_to_speed_index(struct gpio_fan_data *fan_data, int rpm) | |
177 | { | |
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 | ||
188 | static 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 | ||
197 | static 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 | ||
179c4fdb | 205 | if (kstrtoul(buf, 10, &pwm) || pwm > 255) |
d6fe1360 SG |
206 | 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 | ||
218 | exit_unlock: | |
219 | mutex_unlock(&fan_data->lock); | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
224 | static 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 | ||
232 | static 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 | ||
179c4fdb | 238 | if (kstrtoul(buf, 10, &val) || val > 1) |
d6fe1360 SG |
239 | 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 | ||
257 | static ssize_t show_pwm_mode(struct device *dev, | |
258 | struct device_attribute *attr, char *buf) | |
259 | { | |
260 | return sprintf(buf, "0\n"); | |
261 | } | |
262 | ||
263 | static 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 | ||
271 | static 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 | ||
280 | static 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 | ||
288 | static 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 | ||
179c4fdb | 295 | if (kstrtoul(buf, 10, &rpm)) |
d6fe1360 SG |
296 | 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 | ||
307 | exit_unlock: | |
308 | mutex_unlock(&fan_data->lock); | |
309 | ||
310 | return ret; | |
311 | } | |
312 | ||
313 | static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm); | |
314 | static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, | |
315 | show_pwm_enable, set_pwm_enable); | |
316 | static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL); | |
317 | static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL); | |
318 | static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL); | |
319 | static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL); | |
320 | static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm); | |
321 | ||
c81cc5a4 GR |
322 | static 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 | ||
7258a125 | 328 | if (index == 0 && !data->alarm) |
c81cc5a4 | 329 | return 0; |
7258a125 | 330 | if (index > 0 && !data->ctrl) |
c81cc5a4 GR |
331 | return 0; |
332 | ||
333 | return attr->mode; | |
334 | } | |
335 | ||
336 | static struct attribute *gpio_fan_attributes[] = { | |
7258a125 GR |
337 | &dev_attr_fan1_alarm.attr, /* 0 */ |
338 | &dev_attr_pwm1.attr, /* 1 */ | |
d6fe1360 SG |
339 | &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 | ||
c81cc5a4 GR |
348 | static const struct attribute_group gpio_fan_group = { |
349 | .attrs = gpio_fan_attributes, | |
350 | .is_visible = gpio_fan_is_visible, | |
d6fe1360 SG |
351 | }; |
352 | ||
7258a125 GR |
353 | static const struct attribute_group *gpio_fan_groups[] = { |
354 | &gpio_fan_group, | |
355 | NULL | |
356 | }; | |
357 | ||
d6fe1360 SG |
358 | static 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++) { | |
d00985f3 GR |
367 | err = devm_gpio_request(&pdev->dev, ctrl[i], |
368 | "GPIO fan control"); | |
d6fe1360 | 369 | if (err) |
d00985f3 | 370 | return err; |
d6fe1360 SG |
371 | |
372 | err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i])); | |
d00985f3 GR |
373 | if (err) |
374 | return err; | |
d6fe1360 SG |
375 | } |
376 | ||
d6fe1360 SG |
377 | fan_data->num_ctrl = num_ctrl; |
378 | fan_data->ctrl = ctrl; | |
379 | fan_data->num_speed = pdata->num_speed; | |
380 | fan_data->speed = pdata->speed; | |
381 | fan_data->pwm_enable = true; /* Enable manual fan speed control. */ | |
382 | fan_data->speed_index = get_fan_speed_index(fan_data); | |
d00985f3 | 383 | if (fan_data->speed_index < 0) |
c52ae3d2 | 384 | return fan_data->speed_index; |
d6fe1360 | 385 | |
c81cc5a4 | 386 | return 0; |
d6fe1360 SG |
387 | } |
388 | ||
55fb8b06 JL |
389 | #ifdef CONFIG_OF_GPIO |
390 | /* | |
391 | * Translate OpenFirmware node properties into platform_data | |
392 | */ | |
393 | static int gpio_fan_get_of_pdata(struct device *dev, | |
394 | struct gpio_fan_platform_data *pdata) | |
395 | { | |
396 | struct device_node *node; | |
397 | struct gpio_fan_speed *speed; | |
398 | unsigned *ctrl; | |
399 | unsigned i; | |
400 | u32 u; | |
401 | struct property *prop; | |
402 | const __be32 *p; | |
403 | ||
404 | node = dev->of_node; | |
405 | ||
406 | /* Fill GPIO pin array */ | |
407 | pdata->num_ctrl = of_gpio_count(node); | |
e80beb27 | 408 | if (pdata->num_ctrl <= 0) { |
55fb8b06 JL |
409 | dev_err(dev, "gpios DT property empty / missing"); |
410 | return -ENODEV; | |
411 | } | |
412 | ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned), | |
413 | GFP_KERNEL); | |
414 | if (!ctrl) | |
415 | return -ENOMEM; | |
416 | for (i = 0; i < pdata->num_ctrl; i++) { | |
417 | int val; | |
418 | ||
419 | val = of_get_gpio(node, i); | |
420 | if (val < 0) | |
421 | return val; | |
422 | ctrl[i] = val; | |
423 | } | |
424 | pdata->ctrl = ctrl; | |
425 | ||
426 | /* Get number of RPM/ctrl_val pairs in speed map */ | |
427 | prop = of_find_property(node, "gpio-fan,speed-map", &i); | |
428 | if (!prop) { | |
429 | dev_err(dev, "gpio-fan,speed-map DT property missing"); | |
430 | return -ENODEV; | |
431 | } | |
432 | i = i / sizeof(u32); | |
433 | if (i == 0 || i & 1) { | |
434 | dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries"); | |
435 | return -ENODEV; | |
436 | } | |
437 | pdata->num_speed = i / 2; | |
438 | ||
439 | /* | |
440 | * Populate speed map | |
441 | * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...> | |
442 | * this needs splitting into pairs to create gpio_fan_speed structs | |
443 | */ | |
444 | speed = devm_kzalloc(dev, | |
445 | pdata->num_speed * sizeof(struct gpio_fan_speed), | |
446 | GFP_KERNEL); | |
447 | if (!speed) | |
448 | return -ENOMEM; | |
449 | p = NULL; | |
450 | for (i = 0; i < pdata->num_speed; i++) { | |
451 | p = of_prop_next_u32(prop, p, &u); | |
452 | if (!p) | |
453 | return -ENODEV; | |
454 | speed[i].rpm = u; | |
455 | p = of_prop_next_u32(prop, p, &u); | |
456 | if (!p) | |
457 | return -ENODEV; | |
458 | speed[i].ctrl_val = u; | |
459 | } | |
460 | pdata->speed = speed; | |
461 | ||
462 | /* Alarm GPIO if one exists */ | |
e80beb27 | 463 | if (of_gpio_named_count(node, "alarm-gpios") > 0) { |
55fb8b06 JL |
464 | struct gpio_fan_alarm *alarm; |
465 | int val; | |
466 | enum of_gpio_flags flags; | |
467 | ||
468 | alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm), | |
469 | GFP_KERNEL); | |
470 | if (!alarm) | |
471 | return -ENOMEM; | |
472 | ||
473 | val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags); | |
474 | if (val < 0) | |
475 | return val; | |
476 | alarm->gpio = val; | |
477 | alarm->active_low = flags & OF_GPIO_ACTIVE_LOW; | |
478 | ||
479 | pdata->alarm = alarm; | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
a5977246 | 485 | static struct of_device_id of_gpio_fan_match[] = { |
55fb8b06 JL |
486 | { .compatible = "gpio-fan", }, |
487 | {}, | |
488 | }; | |
489 | #endif /* CONFIG_OF_GPIO */ | |
490 | ||
6c931ae1 | 491 | static int gpio_fan_probe(struct platform_device *pdev) |
d6fe1360 SG |
492 | { |
493 | int err; | |
494 | struct gpio_fan_data *fan_data; | |
a8b3a3a5 | 495 | struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev); |
d6fe1360 | 496 | |
55fb8b06 JL |
497 | #ifdef CONFIG_OF_GPIO |
498 | if (!pdata) { | |
499 | pdata = devm_kzalloc(&pdev->dev, | |
500 | sizeof(struct gpio_fan_platform_data), | |
501 | GFP_KERNEL); | |
502 | if (!pdata) | |
503 | return -ENOMEM; | |
504 | ||
505 | err = gpio_fan_get_of_pdata(&pdev->dev, pdata); | |
506 | if (err) | |
507 | return err; | |
508 | } | |
509 | #else /* CONFIG_OF_GPIO */ | |
d6fe1360 SG |
510 | if (!pdata) |
511 | return -EINVAL; | |
55fb8b06 | 512 | #endif /* CONFIG_OF_GPIO */ |
d6fe1360 | 513 | |
d00985f3 GR |
514 | fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data), |
515 | GFP_KERNEL); | |
d6fe1360 SG |
516 | if (!fan_data) |
517 | return -ENOMEM; | |
518 | ||
519 | fan_data->pdev = pdev; | |
520 | platform_set_drvdata(pdev, fan_data); | |
521 | mutex_init(&fan_data->lock); | |
522 | ||
523 | /* Configure alarm GPIO if available. */ | |
524 | if (pdata->alarm) { | |
525 | err = fan_alarm_init(fan_data, pdata->alarm); | |
526 | if (err) | |
d00985f3 | 527 | return err; |
d6fe1360 SG |
528 | } |
529 | ||
530 | /* Configure control GPIOs if available. */ | |
531 | if (pdata->ctrl && pdata->num_ctrl > 0) { | |
c81cc5a4 GR |
532 | if (!pdata->speed || pdata->num_speed <= 1) |
533 | return -EINVAL; | |
d6fe1360 SG |
534 | err = fan_ctrl_init(fan_data, pdata); |
535 | if (err) | |
c81cc5a4 | 536 | return err; |
d6fe1360 SG |
537 | } |
538 | ||
d6fe1360 | 539 | /* Make this driver part of hwmon class. */ |
7258a125 GR |
540 | fan_data->hwmon_dev = hwmon_device_register_with_groups(&pdev->dev, |
541 | "gpio-fan", fan_data, | |
542 | gpio_fan_groups); | |
543 | if (IS_ERR(fan_data->hwmon_dev)) | |
544 | return PTR_ERR(fan_data->hwmon_dev); | |
d6fe1360 SG |
545 | |
546 | dev_info(&pdev->dev, "GPIO fan initialized\n"); | |
547 | ||
548 | return 0; | |
d6fe1360 SG |
549 | } |
550 | ||
281dfd0b | 551 | static int gpio_fan_remove(struct platform_device *pdev) |
d6fe1360 SG |
552 | { |
553 | struct gpio_fan_data *fan_data = platform_get_drvdata(pdev); | |
554 | ||
555 | hwmon_device_unregister(fan_data->hwmon_dev); | |
d6fe1360 SG |
556 | |
557 | return 0; | |
558 | } | |
559 | ||
6d20a6c0 RW |
560 | #ifdef CONFIG_PM_SLEEP |
561 | static int gpio_fan_suspend(struct device *dev) | |
d6fe1360 | 562 | { |
6d20a6c0 | 563 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 SG |
564 | |
565 | if (fan_data->ctrl) { | |
566 | fan_data->resume_speed = fan_data->speed_index; | |
567 | set_fan_speed(fan_data, 0); | |
568 | } | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
6d20a6c0 | 573 | static int gpio_fan_resume(struct device *dev) |
d6fe1360 | 574 | { |
6d20a6c0 | 575 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 SG |
576 | |
577 | if (fan_data->ctrl) | |
578 | set_fan_speed(fan_data, fan_data->resume_speed); | |
579 | ||
580 | return 0; | |
581 | } | |
6d20a6c0 RW |
582 | |
583 | static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume); | |
24f9c539 | 584 | #define GPIO_FAN_PM (&gpio_fan_pm) |
d6fe1360 | 585 | #else |
6d20a6c0 | 586 | #define GPIO_FAN_PM NULL |
d6fe1360 SG |
587 | #endif |
588 | ||
589 | static struct platform_driver gpio_fan_driver = { | |
590 | .probe = gpio_fan_probe, | |
9e5e9b7a | 591 | .remove = gpio_fan_remove, |
d6fe1360 SG |
592 | .driver = { |
593 | .name = "gpio-fan", | |
6d20a6c0 | 594 | .pm = GPIO_FAN_PM, |
eaa7cc60 | 595 | #ifdef CONFIG_OF_GPIO |
55fb8b06 | 596 | .of_match_table = of_match_ptr(of_gpio_fan_match), |
eaa7cc60 | 597 | #endif |
d6fe1360 SG |
598 | }, |
599 | }; | |
600 | ||
25a236a5 | 601 | module_platform_driver(gpio_fan_driver); |
d6fe1360 SG |
602 | |
603 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); | |
604 | MODULE_DESCRIPTION("GPIO FAN driver"); | |
605 | MODULE_LICENSE("GPL"); | |
606 | MODULE_ALIAS("platform:gpio-fan"); |