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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> | |
b5cf88e4 | 37 | #include <linux/thermal.h> |
d6fe1360 SG |
38 | |
39 | struct gpio_fan_data { | |
40 | struct platform_device *pdev; | |
41 | struct device *hwmon_dev; | |
b5cf88e4 NM |
42 | /* Cooling device if any */ |
43 | struct thermal_cooling_device *cdev; | |
d6fe1360 SG |
44 | struct mutex lock; /* lock GPIOs operations. */ |
45 | int num_ctrl; | |
46 | unsigned *ctrl; | |
47 | int num_speed; | |
48 | struct gpio_fan_speed *speed; | |
49 | int speed_index; | |
6d20a6c0 | 50 | #ifdef CONFIG_PM_SLEEP |
d6fe1360 SG |
51 | int resume_speed; |
52 | #endif | |
53 | bool pwm_enable; | |
54 | struct gpio_fan_alarm *alarm; | |
55 | struct work_struct alarm_work; | |
56 | }; | |
57 | ||
58 | /* | |
59 | * Alarm GPIO. | |
60 | */ | |
61 | ||
62 | static void fan_alarm_notify(struct work_struct *ws) | |
63 | { | |
64 | struct gpio_fan_data *fan_data = | |
65 | container_of(ws, struct gpio_fan_data, alarm_work); | |
66 | ||
67 | sysfs_notify(&fan_data->pdev->dev.kobj, NULL, "fan1_alarm"); | |
68 | kobject_uevent(&fan_data->pdev->dev.kobj, KOBJ_CHANGE); | |
69 | } | |
70 | ||
71 | static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id) | |
72 | { | |
73 | struct gpio_fan_data *fan_data = dev_id; | |
74 | ||
75 | schedule_work(&fan_data->alarm_work); | |
76 | ||
77 | return IRQ_NONE; | |
78 | } | |
79 | ||
80 | static ssize_t show_fan_alarm(struct device *dev, | |
81 | struct device_attribute *attr, char *buf) | |
82 | { | |
83 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
84 | struct gpio_fan_alarm *alarm = fan_data->alarm; | |
52a95c11 | 85 | int value = gpio_get_value_cansleep(alarm->gpio); |
d6fe1360 SG |
86 | |
87 | if (alarm->active_low) | |
88 | value = !value; | |
89 | ||
90 | return sprintf(buf, "%d\n", value); | |
91 | } | |
92 | ||
93 | static DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL); | |
94 | ||
95 | static int fan_alarm_init(struct gpio_fan_data *fan_data, | |
96 | struct gpio_fan_alarm *alarm) | |
97 | { | |
98 | int err; | |
99 | int alarm_irq; | |
100 | struct platform_device *pdev = fan_data->pdev; | |
101 | ||
102 | fan_data->alarm = alarm; | |
103 | ||
d00985f3 | 104 | err = devm_gpio_request(&pdev->dev, alarm->gpio, "GPIO fan alarm"); |
d6fe1360 SG |
105 | if (err) |
106 | return err; | |
107 | ||
108 | err = gpio_direction_input(alarm->gpio); | |
109 | if (err) | |
d00985f3 | 110 | return err; |
d6fe1360 | 111 | |
d6fe1360 SG |
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 | return err; |
125 | } | |
126 | ||
d6fe1360 SG |
127 | /* |
128 | * Control GPIOs. | |
129 | */ | |
130 | ||
131 | /* Must be called with fan_data->lock held, except during initialization. */ | |
132 | static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val) | |
133 | { | |
134 | int i; | |
135 | ||
136 | for (i = 0; i < fan_data->num_ctrl; i++) | |
52a95c11 | 137 | gpio_set_value_cansleep(fan_data->ctrl[i], (ctrl_val >> i) & 1); |
d6fe1360 SG |
138 | } |
139 | ||
140 | static int __get_fan_ctrl(struct gpio_fan_data *fan_data) | |
141 | { | |
142 | int i; | |
143 | int ctrl_val = 0; | |
144 | ||
145 | for (i = 0; i < fan_data->num_ctrl; i++) { | |
146 | int value; | |
147 | ||
52a95c11 | 148 | value = gpio_get_value_cansleep(fan_data->ctrl[i]); |
d6fe1360 SG |
149 | ctrl_val |= (value << i); |
150 | } | |
151 | return ctrl_val; | |
152 | } | |
153 | ||
154 | /* Must be called with fan_data->lock held, except during initialization. */ | |
155 | static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index) | |
156 | { | |
157 | if (fan_data->speed_index == speed_index) | |
158 | return; | |
159 | ||
160 | __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val); | |
161 | fan_data->speed_index = speed_index; | |
162 | } | |
163 | ||
164 | static int get_fan_speed_index(struct gpio_fan_data *fan_data) | |
165 | { | |
166 | int ctrl_val = __get_fan_ctrl(fan_data); | |
167 | int i; | |
168 | ||
169 | for (i = 0; i < fan_data->num_speed; i++) | |
170 | if (fan_data->speed[i].ctrl_val == ctrl_val) | |
171 | return i; | |
172 | ||
173 | dev_warn(&fan_data->pdev->dev, | |
174 | "missing speed array entry for GPIO value 0x%x\n", ctrl_val); | |
175 | ||
c52ae3d2 | 176 | return -ENODEV; |
d6fe1360 SG |
177 | } |
178 | ||
2565fb05 | 179 | static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm) |
d6fe1360 SG |
180 | { |
181 | struct gpio_fan_speed *speed = fan_data->speed; | |
182 | int i; | |
183 | ||
184 | for (i = 0; i < fan_data->num_speed; i++) | |
185 | if (speed[i].rpm >= rpm) | |
186 | return i; | |
187 | ||
188 | return fan_data->num_speed - 1; | |
189 | } | |
190 | ||
191 | static ssize_t show_pwm(struct device *dev, | |
192 | struct device_attribute *attr, char *buf) | |
193 | { | |
194 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
195 | u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1); | |
196 | ||
197 | return sprintf(buf, "%d\n", pwm); | |
198 | } | |
199 | ||
200 | static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, | |
201 | const char *buf, size_t count) | |
202 | { | |
203 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
204 | unsigned long pwm; | |
205 | int speed_index; | |
206 | int ret = count; | |
207 | ||
179c4fdb | 208 | if (kstrtoul(buf, 10, &pwm) || pwm > 255) |
d6fe1360 SG |
209 | return -EINVAL; |
210 | ||
211 | mutex_lock(&fan_data->lock); | |
212 | ||
213 | if (!fan_data->pwm_enable) { | |
214 | ret = -EPERM; | |
215 | goto exit_unlock; | |
216 | } | |
217 | ||
218 | speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255); | |
219 | set_fan_speed(fan_data, speed_index); | |
220 | ||
221 | exit_unlock: | |
222 | mutex_unlock(&fan_data->lock); | |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
227 | static ssize_t show_pwm_enable(struct device *dev, | |
228 | struct device_attribute *attr, char *buf) | |
229 | { | |
230 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
231 | ||
232 | return sprintf(buf, "%d\n", fan_data->pwm_enable); | |
233 | } | |
234 | ||
235 | static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr, | |
236 | const char *buf, size_t count) | |
237 | { | |
238 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
239 | unsigned long val; | |
240 | ||
179c4fdb | 241 | if (kstrtoul(buf, 10, &val) || val > 1) |
d6fe1360 SG |
242 | return -EINVAL; |
243 | ||
244 | if (fan_data->pwm_enable == val) | |
245 | return count; | |
246 | ||
247 | mutex_lock(&fan_data->lock); | |
248 | ||
249 | fan_data->pwm_enable = val; | |
250 | ||
251 | /* Disable manual control mode: set fan at full speed. */ | |
252 | if (val == 0) | |
253 | set_fan_speed(fan_data, fan_data->num_speed - 1); | |
254 | ||
255 | mutex_unlock(&fan_data->lock); | |
256 | ||
257 | return count; | |
258 | } | |
259 | ||
260 | static ssize_t show_pwm_mode(struct device *dev, | |
261 | struct device_attribute *attr, char *buf) | |
262 | { | |
263 | return sprintf(buf, "0\n"); | |
264 | } | |
265 | ||
266 | static ssize_t show_rpm_min(struct device *dev, | |
267 | struct device_attribute *attr, char *buf) | |
268 | { | |
269 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
270 | ||
271 | return sprintf(buf, "%d\n", fan_data->speed[0].rpm); | |
272 | } | |
273 | ||
274 | static ssize_t show_rpm_max(struct device *dev, | |
275 | struct device_attribute *attr, char *buf) | |
276 | { | |
277 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
278 | ||
279 | return sprintf(buf, "%d\n", | |
280 | fan_data->speed[fan_data->num_speed - 1].rpm); | |
281 | } | |
282 | ||
283 | static ssize_t show_rpm(struct device *dev, | |
284 | struct device_attribute *attr, char *buf) | |
285 | { | |
286 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
287 | ||
288 | return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm); | |
289 | } | |
290 | ||
291 | static ssize_t set_rpm(struct device *dev, struct device_attribute *attr, | |
292 | const char *buf, size_t count) | |
293 | { | |
294 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
295 | unsigned long rpm; | |
296 | int ret = count; | |
297 | ||
179c4fdb | 298 | if (kstrtoul(buf, 10, &rpm)) |
d6fe1360 SG |
299 | return -EINVAL; |
300 | ||
301 | mutex_lock(&fan_data->lock); | |
302 | ||
303 | if (!fan_data->pwm_enable) { | |
304 | ret = -EPERM; | |
305 | goto exit_unlock; | |
306 | } | |
307 | ||
308 | set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm)); | |
309 | ||
310 | exit_unlock: | |
311 | mutex_unlock(&fan_data->lock); | |
312 | ||
313 | return ret; | |
314 | } | |
315 | ||
316 | static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm); | |
317 | static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, | |
318 | show_pwm_enable, set_pwm_enable); | |
319 | static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL); | |
320 | static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL); | |
321 | static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL); | |
322 | static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL); | |
323 | static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm); | |
324 | ||
c81cc5a4 GR |
325 | static umode_t gpio_fan_is_visible(struct kobject *kobj, |
326 | struct attribute *attr, int index) | |
327 | { | |
328 | struct device *dev = container_of(kobj, struct device, kobj); | |
329 | struct gpio_fan_data *data = dev_get_drvdata(dev); | |
330 | ||
7258a125 | 331 | if (index == 0 && !data->alarm) |
c81cc5a4 | 332 | return 0; |
7258a125 | 333 | if (index > 0 && !data->ctrl) |
c81cc5a4 GR |
334 | return 0; |
335 | ||
336 | return attr->mode; | |
337 | } | |
338 | ||
339 | static struct attribute *gpio_fan_attributes[] = { | |
7258a125 GR |
340 | &dev_attr_fan1_alarm.attr, /* 0 */ |
341 | &dev_attr_pwm1.attr, /* 1 */ | |
d6fe1360 SG |
342 | &dev_attr_pwm1_enable.attr, |
343 | &dev_attr_pwm1_mode.attr, | |
344 | &dev_attr_fan1_input.attr, | |
345 | &dev_attr_fan1_target.attr, | |
346 | &dev_attr_fan1_min.attr, | |
347 | &dev_attr_fan1_max.attr, | |
348 | NULL | |
349 | }; | |
350 | ||
c81cc5a4 GR |
351 | static const struct attribute_group gpio_fan_group = { |
352 | .attrs = gpio_fan_attributes, | |
353 | .is_visible = gpio_fan_is_visible, | |
d6fe1360 SG |
354 | }; |
355 | ||
7258a125 GR |
356 | static const struct attribute_group *gpio_fan_groups[] = { |
357 | &gpio_fan_group, | |
358 | NULL | |
359 | }; | |
360 | ||
d6fe1360 SG |
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 | 374 | |
52a95c11 NM |
375 | err = gpio_direction_output(ctrl[i], |
376 | gpio_get_value_cansleep(ctrl[i])); | |
d00985f3 GR |
377 | if (err) |
378 | return err; | |
d6fe1360 SG |
379 | } |
380 | ||
d6fe1360 SG |
381 | fan_data->num_ctrl = num_ctrl; |
382 | fan_data->ctrl = ctrl; | |
383 | fan_data->num_speed = pdata->num_speed; | |
384 | fan_data->speed = pdata->speed; | |
385 | fan_data->pwm_enable = true; /* Enable manual fan speed control. */ | |
386 | fan_data->speed_index = get_fan_speed_index(fan_data); | |
d00985f3 | 387 | if (fan_data->speed_index < 0) |
c52ae3d2 | 388 | return fan_data->speed_index; |
d6fe1360 | 389 | |
c81cc5a4 | 390 | return 0; |
d6fe1360 SG |
391 | } |
392 | ||
b5cf88e4 NM |
393 | static int gpio_fan_get_max_state(struct thermal_cooling_device *cdev, |
394 | unsigned long *state) | |
395 | { | |
396 | struct gpio_fan_data *fan_data = cdev->devdata; | |
397 | ||
398 | if (!fan_data) | |
399 | return -EINVAL; | |
400 | ||
401 | *state = fan_data->num_speed - 1; | |
402 | return 0; | |
403 | } | |
404 | ||
405 | static int gpio_fan_get_cur_state(struct thermal_cooling_device *cdev, | |
406 | unsigned long *state) | |
407 | { | |
408 | struct gpio_fan_data *fan_data = cdev->devdata; | |
409 | int r; | |
410 | ||
411 | if (!fan_data) | |
412 | return -EINVAL; | |
413 | ||
414 | r = get_fan_speed_index(fan_data); | |
415 | if (r < 0) | |
416 | return r; | |
417 | ||
418 | *state = r; | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev, | |
423 | unsigned long state) | |
424 | { | |
425 | struct gpio_fan_data *fan_data = cdev->devdata; | |
426 | ||
427 | if (!fan_data) | |
428 | return -EINVAL; | |
429 | ||
430 | set_fan_speed(fan_data, state); | |
431 | return 0; | |
432 | } | |
433 | ||
434 | static const struct thermal_cooling_device_ops gpio_fan_cool_ops = { | |
435 | .get_max_state = gpio_fan_get_max_state, | |
436 | .get_cur_state = gpio_fan_get_cur_state, | |
437 | .set_cur_state = gpio_fan_set_cur_state, | |
438 | }; | |
439 | ||
55fb8b06 JL |
440 | #ifdef CONFIG_OF_GPIO |
441 | /* | |
442 | * Translate OpenFirmware node properties into platform_data | |
443 | */ | |
444 | static int gpio_fan_get_of_pdata(struct device *dev, | |
445 | struct gpio_fan_platform_data *pdata) | |
446 | { | |
447 | struct device_node *node; | |
448 | struct gpio_fan_speed *speed; | |
449 | unsigned *ctrl; | |
450 | unsigned i; | |
451 | u32 u; | |
452 | struct property *prop; | |
453 | const __be32 *p; | |
454 | ||
455 | node = dev->of_node; | |
456 | ||
73ef85f4 SG |
457 | /* Alarm GPIO if one exists */ |
458 | if (of_gpio_named_count(node, "alarm-gpios") > 0) { | |
459 | struct gpio_fan_alarm *alarm; | |
460 | int val; | |
461 | enum of_gpio_flags flags; | |
462 | ||
463 | alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm), | |
464 | GFP_KERNEL); | |
465 | if (!alarm) | |
466 | return -ENOMEM; | |
467 | ||
468 | val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags); | |
469 | if (val < 0) | |
470 | return val; | |
471 | alarm->gpio = val; | |
472 | alarm->active_low = flags & OF_GPIO_ACTIVE_LOW; | |
473 | ||
474 | pdata->alarm = alarm; | |
475 | } | |
476 | ||
55fb8b06 JL |
477 | /* Fill GPIO pin array */ |
478 | pdata->num_ctrl = of_gpio_count(node); | |
e80beb27 | 479 | if (pdata->num_ctrl <= 0) { |
73ef85f4 SG |
480 | if (pdata->alarm) |
481 | return 0; | |
482 | dev_err(dev, "DT properties empty / missing"); | |
55fb8b06 JL |
483 | return -ENODEV; |
484 | } | |
485 | ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned), | |
486 | GFP_KERNEL); | |
487 | if (!ctrl) | |
488 | return -ENOMEM; | |
489 | for (i = 0; i < pdata->num_ctrl; i++) { | |
490 | int val; | |
491 | ||
492 | val = of_get_gpio(node, i); | |
493 | if (val < 0) | |
494 | return val; | |
495 | ctrl[i] = val; | |
496 | } | |
497 | pdata->ctrl = ctrl; | |
498 | ||
499 | /* Get number of RPM/ctrl_val pairs in speed map */ | |
500 | prop = of_find_property(node, "gpio-fan,speed-map", &i); | |
501 | if (!prop) { | |
502 | dev_err(dev, "gpio-fan,speed-map DT property missing"); | |
503 | return -ENODEV; | |
504 | } | |
505 | i = i / sizeof(u32); | |
506 | if (i == 0 || i & 1) { | |
507 | dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries"); | |
508 | return -ENODEV; | |
509 | } | |
510 | pdata->num_speed = i / 2; | |
511 | ||
512 | /* | |
513 | * Populate speed map | |
514 | * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...> | |
515 | * this needs splitting into pairs to create gpio_fan_speed structs | |
516 | */ | |
517 | speed = devm_kzalloc(dev, | |
518 | pdata->num_speed * sizeof(struct gpio_fan_speed), | |
519 | GFP_KERNEL); | |
520 | if (!speed) | |
521 | return -ENOMEM; | |
522 | p = NULL; | |
523 | for (i = 0; i < pdata->num_speed; i++) { | |
524 | p = of_prop_next_u32(prop, p, &u); | |
525 | if (!p) | |
526 | return -ENODEV; | |
527 | speed[i].rpm = u; | |
528 | p = of_prop_next_u32(prop, p, &u); | |
529 | if (!p) | |
530 | return -ENODEV; | |
531 | speed[i].ctrl_val = u; | |
532 | } | |
533 | pdata->speed = speed; | |
534 | ||
55fb8b06 JL |
535 | return 0; |
536 | } | |
537 | ||
6de709c5 | 538 | static const struct of_device_id of_gpio_fan_match[] = { |
55fb8b06 JL |
539 | { .compatible = "gpio-fan", }, |
540 | {}, | |
541 | }; | |
542 | #endif /* CONFIG_OF_GPIO */ | |
543 | ||
6c931ae1 | 544 | static int gpio_fan_probe(struct platform_device *pdev) |
d6fe1360 SG |
545 | { |
546 | int err; | |
547 | struct gpio_fan_data *fan_data; | |
a8b3a3a5 | 548 | struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev); |
d6fe1360 | 549 | |
b5cf88e4 NM |
550 | fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data), |
551 | GFP_KERNEL); | |
552 | if (!fan_data) | |
553 | return -ENOMEM; | |
554 | ||
55fb8b06 JL |
555 | #ifdef CONFIG_OF_GPIO |
556 | if (!pdata) { | |
557 | pdata = devm_kzalloc(&pdev->dev, | |
558 | sizeof(struct gpio_fan_platform_data), | |
559 | GFP_KERNEL); | |
560 | if (!pdata) | |
561 | return -ENOMEM; | |
562 | ||
563 | err = gpio_fan_get_of_pdata(&pdev->dev, pdata); | |
564 | if (err) | |
565 | return err; | |
b5cf88e4 NM |
566 | /* Optional cooling device register for Device tree platforms */ |
567 | fan_data->cdev = | |
568 | thermal_of_cooling_device_register(pdev->dev.of_node, | |
569 | "gpio-fan", fan_data, | |
570 | &gpio_fan_cool_ops); | |
55fb8b06 JL |
571 | } |
572 | #else /* CONFIG_OF_GPIO */ | |
d6fe1360 SG |
573 | if (!pdata) |
574 | return -EINVAL; | |
b5cf88e4 NM |
575 | /* Optional cooling device register for non Device tree platforms */ |
576 | fan_data->cdev = thermal_cooling_device_register("gpio-fan", fan_data, | |
577 | &gpio_fan_cool_ops); | |
55fb8b06 | 578 | #endif /* CONFIG_OF_GPIO */ |
d6fe1360 | 579 | |
d6fe1360 SG |
580 | fan_data->pdev = pdev; |
581 | platform_set_drvdata(pdev, fan_data); | |
582 | mutex_init(&fan_data->lock); | |
583 | ||
584 | /* Configure alarm GPIO if available. */ | |
585 | if (pdata->alarm) { | |
586 | err = fan_alarm_init(fan_data, pdata->alarm); | |
587 | if (err) | |
d00985f3 | 588 | return err; |
d6fe1360 SG |
589 | } |
590 | ||
591 | /* Configure control GPIOs if available. */ | |
592 | if (pdata->ctrl && pdata->num_ctrl > 0) { | |
c81cc5a4 GR |
593 | if (!pdata->speed || pdata->num_speed <= 1) |
594 | return -EINVAL; | |
d6fe1360 SG |
595 | err = fan_ctrl_init(fan_data, pdata); |
596 | if (err) | |
c81cc5a4 | 597 | return err; |
d6fe1360 SG |
598 | } |
599 | ||
d6fe1360 | 600 | /* Make this driver part of hwmon class. */ |
49153b09 AL |
601 | fan_data->hwmon_dev = |
602 | devm_hwmon_device_register_with_groups(&pdev->dev, | |
603 | "gpio_fan", fan_data, | |
604 | gpio_fan_groups); | |
7258a125 GR |
605 | if (IS_ERR(fan_data->hwmon_dev)) |
606 | return PTR_ERR(fan_data->hwmon_dev); | |
d6fe1360 SG |
607 | |
608 | dev_info(&pdev->dev, "GPIO fan initialized\n"); | |
609 | ||
610 | return 0; | |
d6fe1360 SG |
611 | } |
612 | ||
b5cf88e4 | 613 | static int gpio_fan_remove(struct platform_device *pdev) |
b95579cd | 614 | { |
b5cf88e4 NM |
615 | struct gpio_fan_data *fan_data = platform_get_drvdata(pdev); |
616 | ||
617 | if (!IS_ERR(fan_data->cdev)) | |
618 | thermal_cooling_device_unregister(fan_data->cdev); | |
b95579cd NM |
619 | |
620 | if (fan_data->ctrl) | |
621 | set_fan_speed(fan_data, 0); | |
b5cf88e4 NM |
622 | |
623 | return 0; | |
624 | } | |
625 | ||
626 | static void gpio_fan_shutdown(struct platform_device *pdev) | |
627 | { | |
628 | gpio_fan_remove(pdev); | |
b95579cd NM |
629 | } |
630 | ||
6d20a6c0 RW |
631 | #ifdef CONFIG_PM_SLEEP |
632 | static int gpio_fan_suspend(struct device *dev) | |
d6fe1360 | 633 | { |
6d20a6c0 | 634 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 SG |
635 | |
636 | if (fan_data->ctrl) { | |
637 | fan_data->resume_speed = fan_data->speed_index; | |
638 | set_fan_speed(fan_data, 0); | |
639 | } | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
6d20a6c0 | 644 | static int gpio_fan_resume(struct device *dev) |
d6fe1360 | 645 | { |
6d20a6c0 | 646 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 SG |
647 | |
648 | if (fan_data->ctrl) | |
649 | set_fan_speed(fan_data, fan_data->resume_speed); | |
650 | ||
651 | return 0; | |
652 | } | |
6d20a6c0 RW |
653 | |
654 | static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume); | |
24f9c539 | 655 | #define GPIO_FAN_PM (&gpio_fan_pm) |
d6fe1360 | 656 | #else |
6d20a6c0 | 657 | #define GPIO_FAN_PM NULL |
d6fe1360 SG |
658 | #endif |
659 | ||
660 | static struct platform_driver gpio_fan_driver = { | |
661 | .probe = gpio_fan_probe, | |
b5cf88e4 | 662 | .remove = gpio_fan_remove, |
b95579cd | 663 | .shutdown = gpio_fan_shutdown, |
d6fe1360 SG |
664 | .driver = { |
665 | .name = "gpio-fan", | |
6d20a6c0 | 666 | .pm = GPIO_FAN_PM, |
eaa7cc60 | 667 | #ifdef CONFIG_OF_GPIO |
55fb8b06 | 668 | .of_match_table = of_match_ptr(of_gpio_fan_match), |
eaa7cc60 | 669 | #endif |
d6fe1360 SG |
670 | }, |
671 | }; | |
672 | ||
25a236a5 | 673 | module_platform_driver(gpio_fan_driver); |
d6fe1360 SG |
674 | |
675 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); | |
676 | MODULE_DESCRIPTION("GPIO FAN driver"); | |
677 | MODULE_LICENSE("GPL"); | |
678 | MODULE_ALIAS("platform:gpio-fan"); |