Commit | Line | Data |
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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> | |
9de382fd | 32 | #include <linux/gpio/consumer.h> |
c50588ab | 33 | #include <linux/of.h> |
55fb8b06 | 34 | #include <linux/of_platform.h> |
b5cf88e4 | 35 | #include <linux/thermal.h> |
d6fe1360 | 36 | |
ef7a6124 LW |
37 | struct gpio_fan_speed { |
38 | int rpm; | |
39 | int ctrl_val; | |
40 | }; | |
41 | ||
d6fe1360 | 42 | struct gpio_fan_data { |
8c0eb9bc | 43 | struct device *dev; |
d6fe1360 | 44 | struct device *hwmon_dev; |
b5cf88e4 NM |
45 | /* Cooling device if any */ |
46 | struct thermal_cooling_device *cdev; | |
d6fe1360 | 47 | struct mutex lock; /* lock GPIOs operations. */ |
e99c2e5d | 48 | int num_gpios; |
9de382fd | 49 | struct gpio_desc **gpios; |
d6fe1360 SG |
50 | int num_speed; |
51 | struct gpio_fan_speed *speed; | |
52 | int speed_index; | |
6d20a6c0 | 53 | #ifdef CONFIG_PM_SLEEP |
d6fe1360 SG |
54 | int resume_speed; |
55 | #endif | |
56 | bool pwm_enable; | |
9de382fd | 57 | struct gpio_desc *alarm_gpio; |
d6fe1360 SG |
58 | struct work_struct alarm_work; |
59 | }; | |
60 | ||
61 | /* | |
62 | * Alarm GPIO. | |
63 | */ | |
64 | ||
65 | static void fan_alarm_notify(struct work_struct *ws) | |
66 | { | |
67 | struct gpio_fan_data *fan_data = | |
68 | container_of(ws, struct gpio_fan_data, alarm_work); | |
69 | ||
8c0eb9bc LW |
70 | sysfs_notify(&fan_data->dev->kobj, NULL, "fan1_alarm"); |
71 | kobject_uevent(&fan_data->dev->kobj, KOBJ_CHANGE); | |
d6fe1360 SG |
72 | } |
73 | ||
74 | static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id) | |
75 | { | |
76 | struct gpio_fan_data *fan_data = dev_id; | |
77 | ||
78 | schedule_work(&fan_data->alarm_work); | |
79 | ||
80 | return IRQ_NONE; | |
81 | } | |
82 | ||
c490c63e JL |
83 | static ssize_t fan1_alarm_show(struct device *dev, |
84 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
85 | { |
86 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
d6fe1360 | 87 | |
9de382fd LW |
88 | return sprintf(buf, "%d\n", |
89 | gpiod_get_value_cansleep(fan_data->alarm_gpio)); | |
d6fe1360 SG |
90 | } |
91 | ||
c490c63e | 92 | static DEVICE_ATTR_RO(fan1_alarm); |
d6fe1360 | 93 | |
b5482f7e | 94 | static int fan_alarm_init(struct gpio_fan_data *fan_data) |
d6fe1360 | 95 | { |
d6fe1360 | 96 | int alarm_irq; |
8c0eb9bc | 97 | struct device *dev = fan_data->dev; |
d6fe1360 | 98 | |
d6fe1360 SG |
99 | /* |
100 | * If the alarm GPIO don't support interrupts, just leave | |
101 | * without initializing the fail notification support. | |
102 | */ | |
9de382fd LW |
103 | alarm_irq = gpiod_to_irq(fan_data->alarm_gpio); |
104 | if (alarm_irq <= 0) | |
d6fe1360 SG |
105 | return 0; |
106 | ||
107 | INIT_WORK(&fan_data->alarm_work, fan_alarm_notify); | |
dced35ae | 108 | irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH); |
9de382fd LW |
109 | return devm_request_irq(dev, alarm_irq, fan_alarm_irq_handler, |
110 | IRQF_SHARED, "GPIO fan alarm", fan_data); | |
d6fe1360 SG |
111 | } |
112 | ||
d6fe1360 SG |
113 | /* |
114 | * Control GPIOs. | |
115 | */ | |
116 | ||
117 | /* Must be called with fan_data->lock held, except during initialization. */ | |
118 | static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val) | |
119 | { | |
120 | int i; | |
121 | ||
e99c2e5d | 122 | for (i = 0; i < fan_data->num_gpios; i++) |
9de382fd LW |
123 | gpiod_set_value_cansleep(fan_data->gpios[i], |
124 | (ctrl_val >> i) & 1); | |
d6fe1360 SG |
125 | } |
126 | ||
127 | static int __get_fan_ctrl(struct gpio_fan_data *fan_data) | |
128 | { | |
129 | int i; | |
130 | int ctrl_val = 0; | |
131 | ||
e99c2e5d | 132 | for (i = 0; i < fan_data->num_gpios; i++) { |
d6fe1360 SG |
133 | int value; |
134 | ||
9de382fd | 135 | value = gpiod_get_value_cansleep(fan_data->gpios[i]); |
d6fe1360 SG |
136 | ctrl_val |= (value << i); |
137 | } | |
138 | return ctrl_val; | |
139 | } | |
140 | ||
141 | /* Must be called with fan_data->lock held, except during initialization. */ | |
142 | static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index) | |
143 | { | |
144 | if (fan_data->speed_index == speed_index) | |
145 | return; | |
146 | ||
147 | __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val); | |
148 | fan_data->speed_index = speed_index; | |
149 | } | |
150 | ||
151 | static int get_fan_speed_index(struct gpio_fan_data *fan_data) | |
152 | { | |
153 | int ctrl_val = __get_fan_ctrl(fan_data); | |
154 | int i; | |
155 | ||
156 | for (i = 0; i < fan_data->num_speed; i++) | |
157 | if (fan_data->speed[i].ctrl_val == ctrl_val) | |
158 | return i; | |
159 | ||
8c0eb9bc | 160 | dev_warn(fan_data->dev, |
d6fe1360 SG |
161 | "missing speed array entry for GPIO value 0x%x\n", ctrl_val); |
162 | ||
c52ae3d2 | 163 | return -ENODEV; |
d6fe1360 SG |
164 | } |
165 | ||
2565fb05 | 166 | static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm) |
d6fe1360 SG |
167 | { |
168 | struct gpio_fan_speed *speed = fan_data->speed; | |
169 | int i; | |
170 | ||
171 | for (i = 0; i < fan_data->num_speed; i++) | |
172 | if (speed[i].rpm >= rpm) | |
173 | return i; | |
174 | ||
175 | return fan_data->num_speed - 1; | |
176 | } | |
177 | ||
c490c63e JL |
178 | static ssize_t pwm1_show(struct device *dev, struct device_attribute *attr, |
179 | char *buf) | |
d6fe1360 SG |
180 | { |
181 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
182 | u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1); | |
183 | ||
184 | return sprintf(buf, "%d\n", pwm); | |
185 | } | |
186 | ||
c490c63e JL |
187 | static ssize_t pwm1_store(struct device *dev, struct device_attribute *attr, |
188 | const char *buf, size_t count) | |
d6fe1360 SG |
189 | { |
190 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
191 | unsigned long pwm; | |
192 | int speed_index; | |
193 | int ret = count; | |
194 | ||
179c4fdb | 195 | if (kstrtoul(buf, 10, &pwm) || pwm > 255) |
d6fe1360 SG |
196 | return -EINVAL; |
197 | ||
198 | mutex_lock(&fan_data->lock); | |
199 | ||
200 | if (!fan_data->pwm_enable) { | |
201 | ret = -EPERM; | |
202 | goto exit_unlock; | |
203 | } | |
204 | ||
205 | speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255); | |
206 | set_fan_speed(fan_data, speed_index); | |
207 | ||
208 | exit_unlock: | |
209 | mutex_unlock(&fan_data->lock); | |
210 | ||
211 | return ret; | |
212 | } | |
213 | ||
c490c63e JL |
214 | static ssize_t pwm1_enable_show(struct device *dev, |
215 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
216 | { |
217 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
218 | ||
219 | return sprintf(buf, "%d\n", fan_data->pwm_enable); | |
220 | } | |
221 | ||
c490c63e JL |
222 | static ssize_t pwm1_enable_store(struct device *dev, |
223 | struct device_attribute *attr, | |
224 | const char *buf, size_t count) | |
d6fe1360 SG |
225 | { |
226 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
227 | unsigned long val; | |
228 | ||
179c4fdb | 229 | if (kstrtoul(buf, 10, &val) || val > 1) |
d6fe1360 SG |
230 | return -EINVAL; |
231 | ||
232 | if (fan_data->pwm_enable == val) | |
233 | return count; | |
234 | ||
235 | mutex_lock(&fan_data->lock); | |
236 | ||
237 | fan_data->pwm_enable = val; | |
238 | ||
239 | /* Disable manual control mode: set fan at full speed. */ | |
240 | if (val == 0) | |
241 | set_fan_speed(fan_data, fan_data->num_speed - 1); | |
242 | ||
243 | mutex_unlock(&fan_data->lock); | |
244 | ||
245 | return count; | |
246 | } | |
247 | ||
c490c63e JL |
248 | static ssize_t pwm1_mode_show(struct device *dev, |
249 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
250 | { |
251 | return sprintf(buf, "0\n"); | |
252 | } | |
253 | ||
c490c63e JL |
254 | static ssize_t fan1_min_show(struct device *dev, |
255 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
256 | { |
257 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
258 | ||
259 | return sprintf(buf, "%d\n", fan_data->speed[0].rpm); | |
260 | } | |
261 | ||
c490c63e JL |
262 | static ssize_t fan1_max_show(struct device *dev, |
263 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
264 | { |
265 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
266 | ||
267 | return sprintf(buf, "%d\n", | |
268 | fan_data->speed[fan_data->num_speed - 1].rpm); | |
269 | } | |
270 | ||
c490c63e JL |
271 | static ssize_t fan1_input_show(struct device *dev, |
272 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
273 | { |
274 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
275 | ||
276 | return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm); | |
277 | } | |
278 | ||
279 | static ssize_t set_rpm(struct device *dev, struct device_attribute *attr, | |
280 | const char *buf, size_t count) | |
281 | { | |
282 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
283 | unsigned long rpm; | |
284 | int ret = count; | |
285 | ||
179c4fdb | 286 | if (kstrtoul(buf, 10, &rpm)) |
d6fe1360 SG |
287 | return -EINVAL; |
288 | ||
289 | mutex_lock(&fan_data->lock); | |
290 | ||
291 | if (!fan_data->pwm_enable) { | |
292 | ret = -EPERM; | |
293 | goto exit_unlock; | |
294 | } | |
295 | ||
296 | set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm)); | |
297 | ||
298 | exit_unlock: | |
299 | mutex_unlock(&fan_data->lock); | |
300 | ||
301 | return ret; | |
302 | } | |
303 | ||
c490c63e JL |
304 | static DEVICE_ATTR_RW(pwm1); |
305 | static DEVICE_ATTR_RW(pwm1_enable); | |
306 | static DEVICE_ATTR_RO(pwm1_mode); | |
307 | static DEVICE_ATTR_RO(fan1_min); | |
308 | static DEVICE_ATTR_RO(fan1_max); | |
309 | static DEVICE_ATTR_RO(fan1_input); | |
310 | static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, fan1_input_show, set_rpm); | |
d6fe1360 | 311 | |
c81cc5a4 GR |
312 | static umode_t gpio_fan_is_visible(struct kobject *kobj, |
313 | struct attribute *attr, int index) | |
314 | { | |
315 | struct device *dev = container_of(kobj, struct device, kobj); | |
316 | struct gpio_fan_data *data = dev_get_drvdata(dev); | |
317 | ||
c9933cb1 | 318 | if (index == 0 && !data->alarm_gpio) |
c81cc5a4 | 319 | return 0; |
e99c2e5d | 320 | if (index > 0 && !data->gpios) |
c81cc5a4 GR |
321 | return 0; |
322 | ||
323 | return attr->mode; | |
324 | } | |
325 | ||
326 | static struct attribute *gpio_fan_attributes[] = { | |
7258a125 GR |
327 | &dev_attr_fan1_alarm.attr, /* 0 */ |
328 | &dev_attr_pwm1.attr, /* 1 */ | |
d6fe1360 SG |
329 | &dev_attr_pwm1_enable.attr, |
330 | &dev_attr_pwm1_mode.attr, | |
331 | &dev_attr_fan1_input.attr, | |
332 | &dev_attr_fan1_target.attr, | |
333 | &dev_attr_fan1_min.attr, | |
334 | &dev_attr_fan1_max.attr, | |
335 | NULL | |
336 | }; | |
337 | ||
c81cc5a4 GR |
338 | static const struct attribute_group gpio_fan_group = { |
339 | .attrs = gpio_fan_attributes, | |
340 | .is_visible = gpio_fan_is_visible, | |
d6fe1360 SG |
341 | }; |
342 | ||
7258a125 GR |
343 | static const struct attribute_group *gpio_fan_groups[] = { |
344 | &gpio_fan_group, | |
345 | NULL | |
346 | }; | |
347 | ||
b5482f7e | 348 | static int fan_ctrl_init(struct gpio_fan_data *fan_data) |
d6fe1360 | 349 | { |
e99c2e5d | 350 | int num_gpios = fan_data->num_gpios; |
9de382fd | 351 | struct gpio_desc **gpios = fan_data->gpios; |
d6fe1360 SG |
352 | int i, err; |
353 | ||
e99c2e5d | 354 | for (i = 0; i < num_gpios; i++) { |
9de382fd LW |
355 | /* |
356 | * The GPIO descriptors were retrieved with GPIOD_ASIS so here | |
357 | * we set the GPIO into output mode, carefully preserving the | |
358 | * current value by setting it to whatever it is already set | |
359 | * (no surprise changes in default fan speed). | |
360 | */ | |
361 | err = gpiod_direction_output(gpios[i], | |
362 | gpiod_get_value_cansleep(gpios[i])); | |
d00985f3 GR |
363 | if (err) |
364 | return err; | |
d6fe1360 SG |
365 | } |
366 | ||
d6fe1360 SG |
367 | fan_data->pwm_enable = true; /* Enable manual fan speed control. */ |
368 | fan_data->speed_index = get_fan_speed_index(fan_data); | |
d00985f3 | 369 | if (fan_data->speed_index < 0) |
c52ae3d2 | 370 | return fan_data->speed_index; |
d6fe1360 | 371 | |
c81cc5a4 | 372 | return 0; |
d6fe1360 SG |
373 | } |
374 | ||
b5cf88e4 NM |
375 | static int gpio_fan_get_max_state(struct thermal_cooling_device *cdev, |
376 | unsigned long *state) | |
377 | { | |
378 | struct gpio_fan_data *fan_data = cdev->devdata; | |
379 | ||
380 | if (!fan_data) | |
381 | return -EINVAL; | |
382 | ||
383 | *state = fan_data->num_speed - 1; | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static int gpio_fan_get_cur_state(struct thermal_cooling_device *cdev, | |
388 | unsigned long *state) | |
389 | { | |
390 | struct gpio_fan_data *fan_data = cdev->devdata; | |
b5cf88e4 NM |
391 | |
392 | if (!fan_data) | |
393 | return -EINVAL; | |
394 | ||
000e0949 | 395 | *state = fan_data->speed_index; |
b5cf88e4 NM |
396 | return 0; |
397 | } | |
398 | ||
399 | static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev, | |
400 | unsigned long state) | |
401 | { | |
402 | struct gpio_fan_data *fan_data = cdev->devdata; | |
403 | ||
404 | if (!fan_data) | |
405 | return -EINVAL; | |
406 | ||
407 | set_fan_speed(fan_data, state); | |
408 | return 0; | |
409 | } | |
410 | ||
411 | static const struct thermal_cooling_device_ops gpio_fan_cool_ops = { | |
412 | .get_max_state = gpio_fan_get_max_state, | |
413 | .get_cur_state = gpio_fan_get_cur_state, | |
414 | .set_cur_state = gpio_fan_set_cur_state, | |
415 | }; | |
416 | ||
55fb8b06 JL |
417 | /* |
418 | * Translate OpenFirmware node properties into platform_data | |
419 | */ | |
b5482f7e | 420 | static int gpio_fan_get_of_data(struct gpio_fan_data *fan_data) |
55fb8b06 | 421 | { |
55fb8b06 | 422 | struct gpio_fan_speed *speed; |
b5482f7e LW |
423 | struct device *dev = fan_data->dev; |
424 | struct device_node *np = dev->of_node; | |
9de382fd | 425 | struct gpio_desc **gpios; |
55fb8b06 JL |
426 | unsigned i; |
427 | u32 u; | |
428 | struct property *prop; | |
429 | const __be32 *p; | |
430 | ||
73ef85f4 | 431 | /* Alarm GPIO if one exists */ |
9de382fd LW |
432 | fan_data->alarm_gpio = devm_gpiod_get_optional(dev, "alarm", GPIOD_IN); |
433 | if (IS_ERR(fan_data->alarm_gpio)) | |
434 | return PTR_ERR(fan_data->alarm_gpio); | |
73ef85f4 | 435 | |
55fb8b06 | 436 | /* Fill GPIO pin array */ |
9de382fd | 437 | fan_data->num_gpios = gpiod_count(dev, NULL); |
e99c2e5d | 438 | if (fan_data->num_gpios <= 0) { |
c9933cb1 | 439 | if (fan_data->alarm_gpio) |
73ef85f4 SG |
440 | return 0; |
441 | dev_err(dev, "DT properties empty / missing"); | |
55fb8b06 JL |
442 | return -ENODEV; |
443 | } | |
a86854d0 KC |
444 | gpios = devm_kcalloc(dev, |
445 | fan_data->num_gpios, sizeof(struct gpio_desc *), | |
9de382fd | 446 | GFP_KERNEL); |
e99c2e5d | 447 | if (!gpios) |
55fb8b06 | 448 | return -ENOMEM; |
e99c2e5d | 449 | for (i = 0; i < fan_data->num_gpios; i++) { |
9de382fd LW |
450 | gpios[i] = devm_gpiod_get_index(dev, NULL, i, GPIOD_ASIS); |
451 | if (IS_ERR(gpios[i])) | |
452 | return PTR_ERR(gpios[i]); | |
55fb8b06 | 453 | } |
e99c2e5d | 454 | fan_data->gpios = gpios; |
55fb8b06 JL |
455 | |
456 | /* Get number of RPM/ctrl_val pairs in speed map */ | |
b5482f7e | 457 | prop = of_find_property(np, "gpio-fan,speed-map", &i); |
55fb8b06 JL |
458 | if (!prop) { |
459 | dev_err(dev, "gpio-fan,speed-map DT property missing"); | |
460 | return -ENODEV; | |
461 | } | |
462 | i = i / sizeof(u32); | |
463 | if (i == 0 || i & 1) { | |
464 | dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries"); | |
465 | return -ENODEV; | |
466 | } | |
b5482f7e | 467 | fan_data->num_speed = i / 2; |
55fb8b06 JL |
468 | |
469 | /* | |
470 | * Populate speed map | |
471 | * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...> | |
472 | * this needs splitting into pairs to create gpio_fan_speed structs | |
473 | */ | |
a86854d0 KC |
474 | speed = devm_kcalloc(dev, |
475 | fan_data->num_speed, sizeof(struct gpio_fan_speed), | |
55fb8b06 JL |
476 | GFP_KERNEL); |
477 | if (!speed) | |
478 | return -ENOMEM; | |
479 | p = NULL; | |
b5482f7e | 480 | for (i = 0; i < fan_data->num_speed; i++) { |
55fb8b06 JL |
481 | p = of_prop_next_u32(prop, p, &u); |
482 | if (!p) | |
483 | return -ENODEV; | |
484 | speed[i].rpm = u; | |
485 | p = of_prop_next_u32(prop, p, &u); | |
486 | if (!p) | |
487 | return -ENODEV; | |
488 | speed[i].ctrl_val = u; | |
489 | } | |
b5482f7e | 490 | fan_data->speed = speed; |
55fb8b06 | 491 | |
55fb8b06 JL |
492 | return 0; |
493 | } | |
494 | ||
6de709c5 | 495 | static const struct of_device_id of_gpio_fan_match[] = { |
55fb8b06 JL |
496 | { .compatible = "gpio-fan", }, |
497 | {}, | |
498 | }; | |
fe515288 | 499 | MODULE_DEVICE_TABLE(of, of_gpio_fan_match); |
55fb8b06 | 500 | |
6c931ae1 | 501 | static int gpio_fan_probe(struct platform_device *pdev) |
d6fe1360 SG |
502 | { |
503 | int err; | |
504 | struct gpio_fan_data *fan_data; | |
f9013c16 LW |
505 | struct device *dev = &pdev->dev; |
506 | struct device_node *np = dev->of_node; | |
d6fe1360 | 507 | |
f9013c16 | 508 | fan_data = devm_kzalloc(dev, sizeof(struct gpio_fan_data), |
b5cf88e4 NM |
509 | GFP_KERNEL); |
510 | if (!fan_data) | |
511 | return -ENOMEM; | |
512 | ||
534e28d8 | 513 | fan_data->dev = dev; |
b5482f7e | 514 | err = gpio_fan_get_of_data(fan_data); |
a9b4c8af LW |
515 | if (err) |
516 | return err; | |
d6fe1360 | 517 | |
d6fe1360 SG |
518 | platform_set_drvdata(pdev, fan_data); |
519 | mutex_init(&fan_data->lock); | |
520 | ||
521 | /* Configure alarm GPIO if available. */ | |
c9933cb1 | 522 | if (fan_data->alarm_gpio) { |
b5482f7e | 523 | err = fan_alarm_init(fan_data); |
d6fe1360 | 524 | if (err) |
d00985f3 | 525 | return err; |
d6fe1360 SG |
526 | } |
527 | ||
528 | /* Configure control GPIOs if available. */ | |
e99c2e5d | 529 | if (fan_data->gpios && fan_data->num_gpios > 0) { |
b5482f7e | 530 | if (!fan_data->speed || fan_data->num_speed <= 1) |
c81cc5a4 | 531 | return -EINVAL; |
b5482f7e | 532 | err = fan_ctrl_init(fan_data); |
d6fe1360 | 533 | if (err) |
c81cc5a4 | 534 | return err; |
d6fe1360 SG |
535 | } |
536 | ||
d6fe1360 | 537 | /* Make this driver part of hwmon class. */ |
49153b09 | 538 | fan_data->hwmon_dev = |
f9013c16 | 539 | devm_hwmon_device_register_with_groups(dev, |
49153b09 AL |
540 | "gpio_fan", fan_data, |
541 | gpio_fan_groups); | |
7258a125 GR |
542 | if (IS_ERR(fan_data->hwmon_dev)) |
543 | return PTR_ERR(fan_data->hwmon_dev); | |
a9b4c8af | 544 | |
e76ea261 | 545 | /* Optional cooling device register for Device tree platforms */ |
f9013c16 | 546 | fan_data->cdev = thermal_of_cooling_device_register(np, |
e76ea261 NM |
547 | "gpio-fan", |
548 | fan_data, | |
549 | &gpio_fan_cool_ops); | |
d6fe1360 | 550 | |
f9013c16 | 551 | dev_info(dev, "GPIO fan initialized\n"); |
d6fe1360 SG |
552 | |
553 | return 0; | |
d6fe1360 SG |
554 | } |
555 | ||
b5cf88e4 | 556 | static int gpio_fan_remove(struct platform_device *pdev) |
b95579cd | 557 | { |
b5cf88e4 NM |
558 | struct gpio_fan_data *fan_data = platform_get_drvdata(pdev); |
559 | ||
560 | if (!IS_ERR(fan_data->cdev)) | |
561 | thermal_cooling_device_unregister(fan_data->cdev); | |
b95579cd | 562 | |
e99c2e5d | 563 | if (fan_data->gpios) |
b95579cd | 564 | set_fan_speed(fan_data, 0); |
b5cf88e4 NM |
565 | |
566 | return 0; | |
567 | } | |
568 | ||
569 | static void gpio_fan_shutdown(struct platform_device *pdev) | |
570 | { | |
571 | gpio_fan_remove(pdev); | |
b95579cd NM |
572 | } |
573 | ||
6d20a6c0 RW |
574 | #ifdef CONFIG_PM_SLEEP |
575 | static int gpio_fan_suspend(struct device *dev) | |
d6fe1360 | 576 | { |
6d20a6c0 | 577 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 | 578 | |
e99c2e5d | 579 | if (fan_data->gpios) { |
d6fe1360 SG |
580 | fan_data->resume_speed = fan_data->speed_index; |
581 | set_fan_speed(fan_data, 0); | |
582 | } | |
583 | ||
584 | return 0; | |
585 | } | |
586 | ||
6d20a6c0 | 587 | static int gpio_fan_resume(struct device *dev) |
d6fe1360 | 588 | { |
6d20a6c0 | 589 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 | 590 | |
e99c2e5d | 591 | if (fan_data->gpios) |
d6fe1360 SG |
592 | set_fan_speed(fan_data, fan_data->resume_speed); |
593 | ||
594 | return 0; | |
595 | } | |
6d20a6c0 RW |
596 | |
597 | static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume); | |
24f9c539 | 598 | #define GPIO_FAN_PM (&gpio_fan_pm) |
d6fe1360 | 599 | #else |
6d20a6c0 | 600 | #define GPIO_FAN_PM NULL |
d6fe1360 SG |
601 | #endif |
602 | ||
603 | static struct platform_driver gpio_fan_driver = { | |
604 | .probe = gpio_fan_probe, | |
b5cf88e4 | 605 | .remove = gpio_fan_remove, |
b95579cd | 606 | .shutdown = gpio_fan_shutdown, |
d6fe1360 SG |
607 | .driver = { |
608 | .name = "gpio-fan", | |
6d20a6c0 | 609 | .pm = GPIO_FAN_PM, |
55fb8b06 | 610 | .of_match_table = of_match_ptr(of_gpio_fan_match), |
d6fe1360 SG |
611 | }, |
612 | }; | |
613 | ||
25a236a5 | 614 | module_platform_driver(gpio_fan_driver); |
d6fe1360 SG |
615 | |
616 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); | |
617 | MODULE_DESCRIPTION("GPIO FAN driver"); | |
618 | MODULE_LICENSE("GPL"); | |
619 | MODULE_ALIAS("platform:gpio-fan"); |