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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 SG |
107 | |
108 | err = device_create_file(&pdev->dev, &dev_attr_fan1_alarm); | |
109 | if (err) | |
d00985f3 | 110 | return err; |
d6fe1360 SG |
111 | |
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); | |
dced35ae | 121 | irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH); |
d00985f3 GR |
122 | err = devm_request_irq(&pdev->dev, alarm_irq, fan_alarm_irq_handler, |
123 | IRQF_SHARED, "GPIO fan alarm", fan_data); | |
d6fe1360 SG |
124 | if (err) |
125 | goto err_free_sysfs; | |
126 | ||
127 | return 0; | |
128 | ||
129 | err_free_sysfs: | |
130 | device_remove_file(&pdev->dev, &dev_attr_fan1_alarm); | |
d6fe1360 SG |
131 | return err; |
132 | } | |
133 | ||
134 | static void fan_alarm_free(struct gpio_fan_data *fan_data) | |
135 | { | |
136 | struct platform_device *pdev = fan_data->pdev; | |
d6fe1360 | 137 | |
d6fe1360 | 138 | device_remove_file(&pdev->dev, &dev_attr_fan1_alarm); |
d6fe1360 SG |
139 | } |
140 | ||
141 | /* | |
142 | * Control GPIOs. | |
143 | */ | |
144 | ||
145 | /* Must be called with fan_data->lock held, except during initialization. */ | |
146 | static 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 | ||
154 | static 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. */ | |
169 | static 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 | ||
178 | static 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 | ||
193 | static 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 | ||
205 | static 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 | ||
214 | static 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 | ||
179c4fdb | 222 | if (kstrtoul(buf, 10, &pwm) || pwm > 255) |
d6fe1360 SG |
223 | 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 | ||
235 | exit_unlock: | |
236 | mutex_unlock(&fan_data->lock); | |
237 | ||
238 | return ret; | |
239 | } | |
240 | ||
241 | static 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 | ||
249 | static 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 | ||
179c4fdb | 255 | if (kstrtoul(buf, 10, &val) || val > 1) |
d6fe1360 SG |
256 | 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 | ||
274 | static ssize_t show_pwm_mode(struct device *dev, | |
275 | struct device_attribute *attr, char *buf) | |
276 | { | |
277 | return sprintf(buf, "0\n"); | |
278 | } | |
279 | ||
280 | static 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 | ||
288 | static 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 | ||
297 | static 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 | ||
305 | static 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 | ||
179c4fdb | 312 | if (kstrtoul(buf, 10, &rpm)) |
d6fe1360 SG |
313 | 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 | ||
324 | exit_unlock: | |
325 | mutex_unlock(&fan_data->lock); | |
326 | ||
327 | return ret; | |
328 | } | |
329 | ||
330 | static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm); | |
331 | static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, | |
332 | show_pwm_enable, set_pwm_enable); | |
333 | static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL); | |
334 | static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL); | |
335 | static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL); | |
336 | static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL); | |
337 | static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm); | |
338 | ||
339 | static 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 | ||
350 | static const struct attribute_group gpio_fan_ctrl_group = { | |
351 | .attrs = gpio_fan_ctrl_attributes, | |
352 | }; | |
353 | ||
354 | static 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++) { | |
d00985f3 GR |
363 | err = devm_gpio_request(&pdev->dev, ctrl[i], |
364 | "GPIO fan control"); | |
d6fe1360 | 365 | if (err) |
d00985f3 | 366 | return err; |
d6fe1360 SG |
367 | |
368 | err = gpio_direction_output(ctrl[i], gpio_get_value(ctrl[i])); | |
d00985f3 GR |
369 | if (err) |
370 | return err; | |
d6fe1360 SG |
371 | } |
372 | ||
d6fe1360 SG |
373 | 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); | |
d00985f3 GR |
379 | if (fan_data->speed_index < 0) |
380 | return -ENODEV; | |
d6fe1360 | 381 | |
4f5b7994 | 382 | err = sysfs_create_group(&pdev->dev.kobj, &gpio_fan_ctrl_group); |
d6fe1360 SG |
383 | return err; |
384 | } | |
385 | ||
386 | static void fan_ctrl_free(struct gpio_fan_data *fan_data) | |
387 | { | |
388 | struct platform_device *pdev = fan_data->pdev; | |
d6fe1360 SG |
389 | |
390 | sysfs_remove_group(&pdev->dev.kobj, &gpio_fan_ctrl_group); | |
d6fe1360 SG |
391 | } |
392 | ||
393 | /* | |
394 | * Platform driver. | |
395 | */ | |
396 | ||
397 | static ssize_t show_name(struct device *dev, | |
398 | struct device_attribute *attr, char *buf) | |
399 | { | |
400 | return sprintf(buf, "gpio-fan\n"); | |
401 | } | |
402 | ||
403 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); | |
404 | ||
55fb8b06 JL |
405 | |
406 | #ifdef CONFIG_OF_GPIO | |
407 | /* | |
408 | * Translate OpenFirmware node properties into platform_data | |
409 | */ | |
410 | static 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); | |
425 | if (!pdata->num_ctrl) { | |
426 | 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 */ | |
480 | if (of_gpio_named_count(node, "alarm-gpios")) { | |
481 | 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 | ||
502 | static struct of_device_id of_gpio_fan_match[] __devinitdata = { | |
503 | { .compatible = "gpio-fan", }, | |
504 | {}, | |
505 | }; | |
506 | #endif /* CONFIG_OF_GPIO */ | |
507 | ||
d6fe1360 SG |
508 | static int __devinit gpio_fan_probe(struct platform_device *pdev) |
509 | { | |
510 | int err; | |
511 | struct gpio_fan_data *fan_data; | |
512 | struct gpio_fan_platform_data *pdata = pdev->dev.platform_data; | |
513 | ||
55fb8b06 JL |
514 | #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 */ | |
d6fe1360 SG |
527 | if (!pdata) |
528 | return -EINVAL; | |
55fb8b06 | 529 | #endif /* CONFIG_OF_GPIO */ |
d6fe1360 | 530 | |
d00985f3 GR |
531 | fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data), |
532 | GFP_KERNEL); | |
d6fe1360 SG |
533 | 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) | |
d00985f3 | 544 | return err; |
d6fe1360 SG |
545 | } |
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 | ||
573 | err_remove_name: | |
574 | device_remove_file(&pdev->dev, &dev_attr_name); | |
575 | err_free_ctrl: | |
576 | if (fan_data->ctrl) | |
577 | fan_ctrl_free(fan_data); | |
578 | err_free_alarm: | |
579 | if (fan_data->alarm) | |
580 | fan_alarm_free(fan_data); | |
d6fe1360 SG |
581 | return err; |
582 | } | |
583 | ||
584 | static int __devexit gpio_fan_remove(struct platform_device *pdev) | |
585 | { | |
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); | |
d6fe1360 SG |
594 | |
595 | return 0; | |
596 | } | |
597 | ||
6d20a6c0 RW |
598 | #ifdef CONFIG_PM_SLEEP |
599 | static int gpio_fan_suspend(struct device *dev) | |
d6fe1360 | 600 | { |
6d20a6c0 | 601 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 SG |
602 | |
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 | ||
6d20a6c0 | 611 | static int gpio_fan_resume(struct device *dev) |
d6fe1360 | 612 | { |
6d20a6c0 | 613 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 SG |
614 | |
615 | if (fan_data->ctrl) | |
616 | set_fan_speed(fan_data, fan_data->resume_speed); | |
617 | ||
618 | return 0; | |
619 | } | |
6d20a6c0 RW |
620 | |
621 | static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume); | |
622 | #define GPIO_FAN_PM &gpio_fan_pm | |
d6fe1360 | 623 | #else |
6d20a6c0 | 624 | #define GPIO_FAN_PM NULL |
d6fe1360 SG |
625 | #endif |
626 | ||
627 | static struct platform_driver gpio_fan_driver = { | |
628 | .probe = gpio_fan_probe, | |
629 | .remove = __devexit_p(gpio_fan_remove), | |
d6fe1360 SG |
630 | .driver = { |
631 | .name = "gpio-fan", | |
6d20a6c0 | 632 | .pm = GPIO_FAN_PM, |
55fb8b06 | 633 | .of_match_table = of_match_ptr(of_gpio_fan_match), |
d6fe1360 SG |
634 | }, |
635 | }; | |
636 | ||
25a236a5 | 637 | module_platform_driver(gpio_fan_driver); |
d6fe1360 SG |
638 | |
639 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); | |
640 | MODULE_DESCRIPTION("GPIO FAN driver"); | |
641 | MODULE_LICENSE("GPL"); | |
642 | MODULE_ALIAS("platform:gpio-fan"); |