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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> | |
55fb8b06 JL |
34 | #include <linux/of_platform.h> |
35 | #include <linux/of_gpio.h> | |
d6fe1360 SG |
36 | |
37 | struct 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; | |
6d20a6c0 | 46 | #ifdef CONFIG_PM_SLEEP |
d6fe1360 SG |
47 | 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 | ||
58 | static 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 | ||
67 | static 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 | ||
76 | static 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 | ||
89 | static DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL); | |
90 | ||
91 | static 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 | ||
d00985f3 | 100 | err = devm_gpio_request(&pdev->dev, alarm->gpio, "GPIO fan alarm"); |
d6fe1360 SG |
101 | if (err) |
102 | return err; | |
103 | ||
104 | err = gpio_direction_input(alarm->gpio); | |
105 | if (err) | |
d00985f3 | 106 | return err; |
d6fe1360 | 107 | |
d6fe1360 SG |
108 | /* |
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); | |
dced35ae | 117 | irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH); |
d00985f3 GR |
118 | err = devm_request_irq(&pdev->dev, alarm_irq, fan_alarm_irq_handler, |
119 | IRQF_SHARED, "GPIO fan alarm", fan_data); | |
d6fe1360 SG |
120 | return err; |
121 | } | |
122 | ||
d6fe1360 SG |
123 | /* |
124 | * Control GPIOs. | |
125 | */ | |
126 | ||
127 | /* Must be called with fan_data->lock held, except during initialization. */ | |
128 | static 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 | ||
136 | static 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. */ | |
151 | static 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 | ||
160 | static 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 | ||
175 | static 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 | ||
187 | static 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 | ||
196 | static 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 | ||
179c4fdb | 204 | if (kstrtoul(buf, 10, &pwm) || pwm > 255) |
d6fe1360 SG |
205 | 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 | ||
217 | exit_unlock: | |
218 | mutex_unlock(&fan_data->lock); | |
219 | ||
220 | return ret; | |
221 | } | |
222 | ||
223 | static 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 | ||
231 | static 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 | ||
179c4fdb | 237 | if (kstrtoul(buf, 10, &val) || val > 1) |
d6fe1360 SG |
238 | 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 | ||
256 | static ssize_t show_pwm_mode(struct device *dev, | |
257 | struct device_attribute *attr, char *buf) | |
258 | { | |
259 | return sprintf(buf, "0\n"); | |
260 | } | |
261 | ||
262 | static 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 | ||
270 | static 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 | ||
279 | static 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 | ||
287 | static 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 | ||
179c4fdb | 294 | if (kstrtoul(buf, 10, &rpm)) |
d6fe1360 SG |
295 | 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 | ||
306 | exit_unlock: | |
307 | mutex_unlock(&fan_data->lock); | |
308 | ||
309 | return ret; | |
310 | } | |
311 | ||
c81cc5a4 GR |
312 | static ssize_t show_name(struct device *dev, |
313 | struct device_attribute *attr, char *buf) | |
314 | { | |
315 | return sprintf(buf, "gpio-fan\n"); | |
316 | } | |
317 | ||
d6fe1360 SG |
318 | static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm); |
319 | static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, | |
320 | show_pwm_enable, set_pwm_enable); | |
321 | static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL); | |
322 | static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL); | |
323 | static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL); | |
324 | static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL); | |
325 | static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm); | |
326 | ||
c81cc5a4 GR |
327 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); |
328 | ||
329 | static 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 | ||
343 | static struct attribute *gpio_fan_attributes[] = { | |
344 | &dev_attr_name.attr, | |
345 | &dev_attr_fan1_alarm.attr, /* 1 */ | |
346 | &dev_attr_pwm1.attr, /* 2 */ | |
d6fe1360 SG |
347 | &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 | ||
c81cc5a4 GR |
356 | static const struct attribute_group gpio_fan_group = { |
357 | .attrs = gpio_fan_attributes, | |
358 | .is_visible = gpio_fan_is_visible, | |
d6fe1360 SG |
359 | }; |
360 | ||
361 | static 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++) { | |
d00985f3 GR |
370 | err = devm_gpio_request(&pdev->dev, ctrl[i], |
371 | "GPIO fan control"); | |
d6fe1360 | 372 | if (err) |
d00985f3 | 373 | return err; |
d6fe1360 SG |
374 | |
375 | err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i])); | |
d00985f3 GR |
376 | if (err) |
377 | return err; | |
d6fe1360 SG |
378 | } |
379 | ||
d6fe1360 SG |
380 | 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); | |
d00985f3 GR |
386 | if (fan_data->speed_index < 0) |
387 | return -ENODEV; | |
d6fe1360 | 388 | |
c81cc5a4 | 389 | return 0; |
d6fe1360 SG |
390 | } |
391 | ||
55fb8b06 JL |
392 | #ifdef CONFIG_OF_GPIO |
393 | /* | |
394 | * Translate OpenFirmware node properties into platform_data | |
395 | */ | |
396 | static 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); | |
e80beb27 | 411 | if (pdata->num_ctrl <= 0) { |
55fb8b06 JL |
412 | 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 */ | |
e80beb27 | 466 | if (of_gpio_named_count(node, "alarm-gpios") > 0) { |
55fb8b06 JL |
467 | 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 | ||
a5977246 | 488 | static struct of_device_id of_gpio_fan_match[] = { |
55fb8b06 JL |
489 | { .compatible = "gpio-fan", }, |
490 | {}, | |
491 | }; | |
492 | #endif /* CONFIG_OF_GPIO */ | |
493 | ||
6c931ae1 | 494 | static int gpio_fan_probe(struct platform_device *pdev) |
d6fe1360 SG |
495 | { |
496 | int err; | |
497 | struct gpio_fan_data *fan_data; | |
a8b3a3a5 | 498 | struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev); |
d6fe1360 | 499 | |
55fb8b06 JL |
500 | #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 */ | |
d6fe1360 SG |
513 | if (!pdata) |
514 | return -EINVAL; | |
55fb8b06 | 515 | #endif /* CONFIG_OF_GPIO */ |
d6fe1360 | 516 | |
d00985f3 GR |
517 | fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data), |
518 | GFP_KERNEL); | |
d6fe1360 SG |
519 | 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) | |
d00985f3 | 530 | return err; |
d6fe1360 SG |
531 | } |
532 | ||
533 | /* Configure control GPIOs if available. */ | |
534 | if (pdata->ctrl && pdata->num_ctrl > 0) { | |
c81cc5a4 GR |
535 | if (!pdata->speed || pdata->num_speed <= 1) |
536 | return -EINVAL; | |
d6fe1360 SG |
537 | err = fan_ctrl_init(fan_data, pdata); |
538 | if (err) | |
c81cc5a4 | 539 | return err; |
d6fe1360 SG |
540 | } |
541 | ||
c81cc5a4 | 542 | err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_group); |
d6fe1360 | 543 | if (err) |
c81cc5a4 | 544 | return err; |
d6fe1360 SG |
545 | |
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); | |
c81cc5a4 | 550 | goto err_remove; |
d6fe1360 SG |
551 | } |
552 | ||
553 | dev_info(&pdev->dev, "GPIO fan initialized\n"); | |
554 | ||
555 | return 0; | |
556 | ||
c81cc5a4 GR |
557 | err_remove: |
558 | sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_group); | |
d6fe1360 SG |
559 | return err; |
560 | } | |
561 | ||
281dfd0b | 562 | static int gpio_fan_remove(struct platform_device *pdev) |
d6fe1360 SG |
563 | { |
564 | struct gpio_fan_data *fan_data = platform_get_drvdata(pdev); | |
565 | ||
566 | hwmon_device_unregister(fan_data->hwmon_dev); | |
c81cc5a4 | 567 | sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_group); |
d6fe1360 SG |
568 | |
569 | return 0; | |
570 | } | |
571 | ||
6d20a6c0 RW |
572 | #ifdef CONFIG_PM_SLEEP |
573 | static int gpio_fan_suspend(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 | fan_data->resume_speed = fan_data->speed_index; | |
579 | set_fan_speed(fan_data, 0); | |
580 | } | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
6d20a6c0 | 585 | static int gpio_fan_resume(struct device *dev) |
d6fe1360 | 586 | { |
6d20a6c0 | 587 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 SG |
588 | |
589 | if (fan_data->ctrl) | |
590 | set_fan_speed(fan_data, fan_data->resume_speed); | |
591 | ||
592 | return 0; | |
593 | } | |
6d20a6c0 RW |
594 | |
595 | static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume); | |
24f9c539 | 596 | #define GPIO_FAN_PM (&gpio_fan_pm) |
d6fe1360 | 597 | #else |
6d20a6c0 | 598 | #define GPIO_FAN_PM NULL |
d6fe1360 SG |
599 | #endif |
600 | ||
601 | static struct platform_driver gpio_fan_driver = { | |
602 | .probe = gpio_fan_probe, | |
9e5e9b7a | 603 | .remove = gpio_fan_remove, |
d6fe1360 SG |
604 | .driver = { |
605 | .name = "gpio-fan", | |
6d20a6c0 | 606 | .pm = GPIO_FAN_PM, |
eaa7cc60 | 607 | #ifdef CONFIG_OF_GPIO |
55fb8b06 | 608 | .of_match_table = of_match_ptr(of_gpio_fan_match), |
eaa7cc60 | 609 | #endif |
d6fe1360 SG |
610 | }, |
611 | }; | |
612 | ||
25a236a5 | 613 | module_platform_driver(gpio_fan_driver); |
d6fe1360 SG |
614 | |
615 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); | |
616 | MODULE_DESCRIPTION("GPIO FAN driver"); | |
617 | MODULE_LICENSE("GPL"); | |
618 | MODULE_ALIAS("platform:gpio-fan"); |