Commit | Line | Data |
---|---|---|
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 | ||
c490c63e JL |
80 | static ssize_t fan1_alarm_show(struct device *dev, |
81 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
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 | ||
c490c63e | 93 | static DEVICE_ATTR_RO(fan1_alarm); |
d6fe1360 SG |
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 | ||
c490c63e JL |
191 | static ssize_t pwm1_show(struct device *dev, struct device_attribute *attr, |
192 | char *buf) | |
d6fe1360 SG |
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 | ||
c490c63e JL |
200 | static ssize_t pwm1_store(struct device *dev, struct device_attribute *attr, |
201 | const char *buf, size_t count) | |
d6fe1360 SG |
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 | ||
c490c63e JL |
227 | static ssize_t pwm1_enable_show(struct device *dev, |
228 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
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 | ||
c490c63e JL |
235 | static ssize_t pwm1_enable_store(struct device *dev, |
236 | struct device_attribute *attr, | |
237 | const char *buf, size_t count) | |
d6fe1360 SG |
238 | { |
239 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
240 | unsigned long val; | |
241 | ||
179c4fdb | 242 | if (kstrtoul(buf, 10, &val) || val > 1) |
d6fe1360 SG |
243 | return -EINVAL; |
244 | ||
245 | if (fan_data->pwm_enable == val) | |
246 | return count; | |
247 | ||
248 | mutex_lock(&fan_data->lock); | |
249 | ||
250 | fan_data->pwm_enable = val; | |
251 | ||
252 | /* Disable manual control mode: set fan at full speed. */ | |
253 | if (val == 0) | |
254 | set_fan_speed(fan_data, fan_data->num_speed - 1); | |
255 | ||
256 | mutex_unlock(&fan_data->lock); | |
257 | ||
258 | return count; | |
259 | } | |
260 | ||
c490c63e JL |
261 | static ssize_t pwm1_mode_show(struct device *dev, |
262 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
263 | { |
264 | return sprintf(buf, "0\n"); | |
265 | } | |
266 | ||
c490c63e JL |
267 | static ssize_t fan1_min_show(struct device *dev, |
268 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
269 | { |
270 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
271 | ||
272 | return sprintf(buf, "%d\n", fan_data->speed[0].rpm); | |
273 | } | |
274 | ||
c490c63e JL |
275 | static ssize_t fan1_max_show(struct device *dev, |
276 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
277 | { |
278 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
279 | ||
280 | return sprintf(buf, "%d\n", | |
281 | fan_data->speed[fan_data->num_speed - 1].rpm); | |
282 | } | |
283 | ||
c490c63e JL |
284 | static ssize_t fan1_input_show(struct device *dev, |
285 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
286 | { |
287 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
288 | ||
289 | return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm); | |
290 | } | |
291 | ||
292 | static ssize_t set_rpm(struct device *dev, struct device_attribute *attr, | |
293 | const char *buf, size_t count) | |
294 | { | |
295 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
296 | unsigned long rpm; | |
297 | int ret = count; | |
298 | ||
179c4fdb | 299 | if (kstrtoul(buf, 10, &rpm)) |
d6fe1360 SG |
300 | return -EINVAL; |
301 | ||
302 | mutex_lock(&fan_data->lock); | |
303 | ||
304 | if (!fan_data->pwm_enable) { | |
305 | ret = -EPERM; | |
306 | goto exit_unlock; | |
307 | } | |
308 | ||
309 | set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm)); | |
310 | ||
311 | exit_unlock: | |
312 | mutex_unlock(&fan_data->lock); | |
313 | ||
314 | return ret; | |
315 | } | |
316 | ||
c490c63e JL |
317 | static DEVICE_ATTR_RW(pwm1); |
318 | static DEVICE_ATTR_RW(pwm1_enable); | |
319 | static DEVICE_ATTR_RO(pwm1_mode); | |
320 | static DEVICE_ATTR_RO(fan1_min); | |
321 | static DEVICE_ATTR_RO(fan1_max); | |
322 | static DEVICE_ATTR_RO(fan1_input); | |
323 | static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, fan1_input_show, set_rpm); | |
d6fe1360 | 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; | |
b5cf88e4 NM |
409 | |
410 | if (!fan_data) | |
411 | return -EINVAL; | |
412 | ||
000e0949 | 413 | *state = fan_data->speed_index; |
b5cf88e4 NM |
414 | return 0; |
415 | } | |
416 | ||
417 | static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev, | |
418 | unsigned long state) | |
419 | { | |
420 | struct gpio_fan_data *fan_data = cdev->devdata; | |
421 | ||
422 | if (!fan_data) | |
423 | return -EINVAL; | |
424 | ||
425 | set_fan_speed(fan_data, state); | |
426 | return 0; | |
427 | } | |
428 | ||
429 | static const struct thermal_cooling_device_ops gpio_fan_cool_ops = { | |
430 | .get_max_state = gpio_fan_get_max_state, | |
431 | .get_cur_state = gpio_fan_get_cur_state, | |
432 | .set_cur_state = gpio_fan_set_cur_state, | |
433 | }; | |
434 | ||
55fb8b06 JL |
435 | #ifdef CONFIG_OF_GPIO |
436 | /* | |
437 | * Translate OpenFirmware node properties into platform_data | |
438 | */ | |
439 | static int gpio_fan_get_of_pdata(struct device *dev, | |
440 | struct gpio_fan_platform_data *pdata) | |
441 | { | |
442 | struct device_node *node; | |
443 | struct gpio_fan_speed *speed; | |
444 | unsigned *ctrl; | |
445 | unsigned i; | |
446 | u32 u; | |
447 | struct property *prop; | |
448 | const __be32 *p; | |
449 | ||
450 | node = dev->of_node; | |
451 | ||
73ef85f4 SG |
452 | /* Alarm GPIO if one exists */ |
453 | if (of_gpio_named_count(node, "alarm-gpios") > 0) { | |
454 | struct gpio_fan_alarm *alarm; | |
455 | int val; | |
456 | enum of_gpio_flags flags; | |
457 | ||
458 | alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm), | |
459 | GFP_KERNEL); | |
460 | if (!alarm) | |
461 | return -ENOMEM; | |
462 | ||
463 | val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags); | |
464 | if (val < 0) | |
465 | return val; | |
466 | alarm->gpio = val; | |
467 | alarm->active_low = flags & OF_GPIO_ACTIVE_LOW; | |
468 | ||
469 | pdata->alarm = alarm; | |
470 | } | |
471 | ||
55fb8b06 JL |
472 | /* Fill GPIO pin array */ |
473 | pdata->num_ctrl = of_gpio_count(node); | |
e80beb27 | 474 | if (pdata->num_ctrl <= 0) { |
73ef85f4 SG |
475 | if (pdata->alarm) |
476 | return 0; | |
477 | dev_err(dev, "DT properties empty / missing"); | |
55fb8b06 JL |
478 | return -ENODEV; |
479 | } | |
480 | ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned), | |
481 | GFP_KERNEL); | |
482 | if (!ctrl) | |
483 | return -ENOMEM; | |
484 | for (i = 0; i < pdata->num_ctrl; i++) { | |
485 | int val; | |
486 | ||
487 | val = of_get_gpio(node, i); | |
488 | if (val < 0) | |
489 | return val; | |
490 | ctrl[i] = val; | |
491 | } | |
492 | pdata->ctrl = ctrl; | |
493 | ||
494 | /* Get number of RPM/ctrl_val pairs in speed map */ | |
495 | prop = of_find_property(node, "gpio-fan,speed-map", &i); | |
496 | if (!prop) { | |
497 | dev_err(dev, "gpio-fan,speed-map DT property missing"); | |
498 | return -ENODEV; | |
499 | } | |
500 | i = i / sizeof(u32); | |
501 | if (i == 0 || i & 1) { | |
502 | dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries"); | |
503 | return -ENODEV; | |
504 | } | |
505 | pdata->num_speed = i / 2; | |
506 | ||
507 | /* | |
508 | * Populate speed map | |
509 | * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...> | |
510 | * this needs splitting into pairs to create gpio_fan_speed structs | |
511 | */ | |
512 | speed = devm_kzalloc(dev, | |
513 | pdata->num_speed * sizeof(struct gpio_fan_speed), | |
514 | GFP_KERNEL); | |
515 | if (!speed) | |
516 | return -ENOMEM; | |
517 | p = NULL; | |
518 | for (i = 0; i < pdata->num_speed; i++) { | |
519 | p = of_prop_next_u32(prop, p, &u); | |
520 | if (!p) | |
521 | return -ENODEV; | |
522 | speed[i].rpm = u; | |
523 | p = of_prop_next_u32(prop, p, &u); | |
524 | if (!p) | |
525 | return -ENODEV; | |
526 | speed[i].ctrl_val = u; | |
527 | } | |
528 | pdata->speed = speed; | |
529 | ||
55fb8b06 JL |
530 | return 0; |
531 | } | |
532 | ||
6de709c5 | 533 | static const struct of_device_id of_gpio_fan_match[] = { |
55fb8b06 JL |
534 | { .compatible = "gpio-fan", }, |
535 | {}, | |
536 | }; | |
fe515288 | 537 | MODULE_DEVICE_TABLE(of, of_gpio_fan_match); |
55fb8b06 JL |
538 | #endif /* CONFIG_OF_GPIO */ |
539 | ||
6c931ae1 | 540 | static int gpio_fan_probe(struct platform_device *pdev) |
d6fe1360 SG |
541 | { |
542 | int err; | |
543 | struct gpio_fan_data *fan_data; | |
a8b3a3a5 | 544 | struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev); |
d6fe1360 | 545 | |
b5cf88e4 NM |
546 | fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data), |
547 | GFP_KERNEL); | |
548 | if (!fan_data) | |
549 | return -ENOMEM; | |
550 | ||
55fb8b06 JL |
551 | #ifdef CONFIG_OF_GPIO |
552 | if (!pdata) { | |
553 | pdata = devm_kzalloc(&pdev->dev, | |
554 | sizeof(struct gpio_fan_platform_data), | |
555 | GFP_KERNEL); | |
556 | if (!pdata) | |
557 | return -ENOMEM; | |
558 | ||
559 | err = gpio_fan_get_of_pdata(&pdev->dev, pdata); | |
560 | if (err) | |
561 | return err; | |
562 | } | |
563 | #else /* CONFIG_OF_GPIO */ | |
d6fe1360 SG |
564 | if (!pdata) |
565 | return -EINVAL; | |
55fb8b06 | 566 | #endif /* CONFIG_OF_GPIO */ |
d6fe1360 | 567 | |
d6fe1360 SG |
568 | fan_data->pdev = pdev; |
569 | platform_set_drvdata(pdev, fan_data); | |
570 | mutex_init(&fan_data->lock); | |
571 | ||
572 | /* Configure alarm GPIO if available. */ | |
573 | if (pdata->alarm) { | |
574 | err = fan_alarm_init(fan_data, pdata->alarm); | |
575 | if (err) | |
d00985f3 | 576 | return err; |
d6fe1360 SG |
577 | } |
578 | ||
579 | /* Configure control GPIOs if available. */ | |
580 | if (pdata->ctrl && pdata->num_ctrl > 0) { | |
c81cc5a4 GR |
581 | if (!pdata->speed || pdata->num_speed <= 1) |
582 | return -EINVAL; | |
d6fe1360 SG |
583 | err = fan_ctrl_init(fan_data, pdata); |
584 | if (err) | |
c81cc5a4 | 585 | return err; |
d6fe1360 SG |
586 | } |
587 | ||
d6fe1360 | 588 | /* Make this driver part of hwmon class. */ |
49153b09 AL |
589 | fan_data->hwmon_dev = |
590 | devm_hwmon_device_register_with_groups(&pdev->dev, | |
591 | "gpio_fan", fan_data, | |
592 | gpio_fan_groups); | |
7258a125 GR |
593 | if (IS_ERR(fan_data->hwmon_dev)) |
594 | return PTR_ERR(fan_data->hwmon_dev); | |
e76ea261 NM |
595 | #ifdef CONFIG_OF_GPIO |
596 | /* Optional cooling device register for Device tree platforms */ | |
597 | fan_data->cdev = thermal_of_cooling_device_register(pdev->dev.of_node, | |
598 | "gpio-fan", | |
599 | fan_data, | |
600 | &gpio_fan_cool_ops); | |
601 | #else /* CONFIG_OF_GPIO */ | |
602 | /* Optional cooling device register for non Device tree platforms */ | |
603 | fan_data->cdev = thermal_cooling_device_register("gpio-fan", fan_data, | |
604 | &gpio_fan_cool_ops); | |
605 | #endif /* CONFIG_OF_GPIO */ | |
d6fe1360 SG |
606 | |
607 | dev_info(&pdev->dev, "GPIO fan initialized\n"); | |
608 | ||
609 | return 0; | |
d6fe1360 SG |
610 | } |
611 | ||
b5cf88e4 | 612 | static int gpio_fan_remove(struct platform_device *pdev) |
b95579cd | 613 | { |
b5cf88e4 NM |
614 | struct gpio_fan_data *fan_data = platform_get_drvdata(pdev); |
615 | ||
616 | if (!IS_ERR(fan_data->cdev)) | |
617 | thermal_cooling_device_unregister(fan_data->cdev); | |
b95579cd NM |
618 | |
619 | if (fan_data->ctrl) | |
620 | set_fan_speed(fan_data, 0); | |
b5cf88e4 NM |
621 | |
622 | return 0; | |
623 | } | |
624 | ||
625 | static void gpio_fan_shutdown(struct platform_device *pdev) | |
626 | { | |
627 | gpio_fan_remove(pdev); | |
b95579cd NM |
628 | } |
629 | ||
6d20a6c0 RW |
630 | #ifdef CONFIG_PM_SLEEP |
631 | static int gpio_fan_suspend(struct device *dev) | |
d6fe1360 | 632 | { |
6d20a6c0 | 633 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 SG |
634 | |
635 | if (fan_data->ctrl) { | |
636 | fan_data->resume_speed = fan_data->speed_index; | |
637 | set_fan_speed(fan_data, 0); | |
638 | } | |
639 | ||
640 | return 0; | |
641 | } | |
642 | ||
6d20a6c0 | 643 | static int gpio_fan_resume(struct device *dev) |
d6fe1360 | 644 | { |
6d20a6c0 | 645 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 SG |
646 | |
647 | if (fan_data->ctrl) | |
648 | set_fan_speed(fan_data, fan_data->resume_speed); | |
649 | ||
650 | return 0; | |
651 | } | |
6d20a6c0 RW |
652 | |
653 | static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume); | |
24f9c539 | 654 | #define GPIO_FAN_PM (&gpio_fan_pm) |
d6fe1360 | 655 | #else |
6d20a6c0 | 656 | #define GPIO_FAN_PM NULL |
d6fe1360 SG |
657 | #endif |
658 | ||
659 | static struct platform_driver gpio_fan_driver = { | |
660 | .probe = gpio_fan_probe, | |
b5cf88e4 | 661 | .remove = gpio_fan_remove, |
b95579cd | 662 | .shutdown = gpio_fan_shutdown, |
d6fe1360 SG |
663 | .driver = { |
664 | .name = "gpio-fan", | |
6d20a6c0 | 665 | .pm = GPIO_FAN_PM, |
eaa7cc60 | 666 | #ifdef CONFIG_OF_GPIO |
55fb8b06 | 667 | .of_match_table = of_match_ptr(of_gpio_fan_match), |
eaa7cc60 | 668 | #endif |
d6fe1360 SG |
669 | }, |
670 | }; | |
671 | ||
25a236a5 | 672 | module_platform_driver(gpio_fan_driver); |
d6fe1360 SG |
673 | |
674 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); | |
675 | MODULE_DESCRIPTION("GPIO FAN driver"); | |
676 | MODULE_LICENSE("GPL"); | |
677 | MODULE_ALIAS("platform:gpio-fan"); |