Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
d6fe1360 SG |
2 | /* |
3 | * gpio-fan.c - Hwmon driver for fans connected to GPIO lines. | |
4 | * | |
5 | * Copyright (C) 2010 LaCie | |
6 | * | |
7 | * Author: Simon Guinot <sguinot@lacie.com> | |
d6fe1360 SG |
8 | */ |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/irq.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/mutex.h> | |
18 | #include <linux/hwmon.h> | |
9de382fd | 19 | #include <linux/gpio/consumer.h> |
c50588ab | 20 | #include <linux/of.h> |
55fb8b06 | 21 | #include <linux/of_platform.h> |
b5cf88e4 | 22 | #include <linux/thermal.h> |
d6fe1360 | 23 | |
ef7a6124 LW |
24 | struct gpio_fan_speed { |
25 | int rpm; | |
26 | int ctrl_val; | |
27 | }; | |
28 | ||
d6fe1360 | 29 | struct gpio_fan_data { |
8c0eb9bc | 30 | struct device *dev; |
d6fe1360 | 31 | struct device *hwmon_dev; |
b5cf88e4 NM |
32 | /* Cooling device if any */ |
33 | struct thermal_cooling_device *cdev; | |
d6fe1360 | 34 | struct mutex lock; /* lock GPIOs operations. */ |
e99c2e5d | 35 | int num_gpios; |
9de382fd | 36 | struct gpio_desc **gpios; |
d6fe1360 SG |
37 | int num_speed; |
38 | struct gpio_fan_speed *speed; | |
39 | int speed_index; | |
6d20a6c0 | 40 | #ifdef CONFIG_PM_SLEEP |
d6fe1360 SG |
41 | int resume_speed; |
42 | #endif | |
43 | bool pwm_enable; | |
9de382fd | 44 | struct gpio_desc *alarm_gpio; |
d6fe1360 SG |
45 | struct work_struct alarm_work; |
46 | }; | |
47 | ||
48 | /* | |
49 | * Alarm GPIO. | |
50 | */ | |
51 | ||
52 | static void fan_alarm_notify(struct work_struct *ws) | |
53 | { | |
54 | struct gpio_fan_data *fan_data = | |
55 | container_of(ws, struct gpio_fan_data, alarm_work); | |
56 | ||
277c628f CS |
57 | sysfs_notify(&fan_data->hwmon_dev->kobj, NULL, "fan1_alarm"); |
58 | kobject_uevent(&fan_data->hwmon_dev->kobj, KOBJ_CHANGE); | |
d6fe1360 SG |
59 | } |
60 | ||
61 | static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id) | |
62 | { | |
63 | struct gpio_fan_data *fan_data = dev_id; | |
64 | ||
65 | schedule_work(&fan_data->alarm_work); | |
66 | ||
67 | return IRQ_NONE; | |
68 | } | |
69 | ||
c490c63e JL |
70 | static ssize_t fan1_alarm_show(struct device *dev, |
71 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
72 | { |
73 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
d6fe1360 | 74 | |
9de382fd LW |
75 | return sprintf(buf, "%d\n", |
76 | gpiod_get_value_cansleep(fan_data->alarm_gpio)); | |
d6fe1360 SG |
77 | } |
78 | ||
c490c63e | 79 | static DEVICE_ATTR_RO(fan1_alarm); |
d6fe1360 | 80 | |
b5482f7e | 81 | static int fan_alarm_init(struct gpio_fan_data *fan_data) |
d6fe1360 | 82 | { |
d6fe1360 | 83 | int alarm_irq; |
8c0eb9bc | 84 | struct device *dev = fan_data->dev; |
d6fe1360 | 85 | |
d6fe1360 SG |
86 | /* |
87 | * If the alarm GPIO don't support interrupts, just leave | |
88 | * without initializing the fail notification support. | |
89 | */ | |
9de382fd LW |
90 | alarm_irq = gpiod_to_irq(fan_data->alarm_gpio); |
91 | if (alarm_irq <= 0) | |
d6fe1360 SG |
92 | return 0; |
93 | ||
94 | INIT_WORK(&fan_data->alarm_work, fan_alarm_notify); | |
dced35ae | 95 | irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH); |
9de382fd LW |
96 | return devm_request_irq(dev, alarm_irq, fan_alarm_irq_handler, |
97 | IRQF_SHARED, "GPIO fan alarm", fan_data); | |
d6fe1360 SG |
98 | } |
99 | ||
d6fe1360 SG |
100 | /* |
101 | * Control GPIOs. | |
102 | */ | |
103 | ||
104 | /* Must be called with fan_data->lock held, except during initialization. */ | |
105 | static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val) | |
106 | { | |
107 | int i; | |
108 | ||
e99c2e5d | 109 | for (i = 0; i < fan_data->num_gpios; i++) |
9de382fd LW |
110 | gpiod_set_value_cansleep(fan_data->gpios[i], |
111 | (ctrl_val >> i) & 1); | |
d6fe1360 SG |
112 | } |
113 | ||
114 | static int __get_fan_ctrl(struct gpio_fan_data *fan_data) | |
115 | { | |
116 | int i; | |
117 | int ctrl_val = 0; | |
118 | ||
e99c2e5d | 119 | for (i = 0; i < fan_data->num_gpios; i++) { |
d6fe1360 SG |
120 | int value; |
121 | ||
9de382fd | 122 | value = gpiod_get_value_cansleep(fan_data->gpios[i]); |
d6fe1360 SG |
123 | ctrl_val |= (value << i); |
124 | } | |
125 | return ctrl_val; | |
126 | } | |
127 | ||
128 | /* Must be called with fan_data->lock held, except during initialization. */ | |
129 | static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index) | |
130 | { | |
131 | if (fan_data->speed_index == speed_index) | |
132 | return; | |
133 | ||
134 | __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val); | |
135 | fan_data->speed_index = speed_index; | |
136 | } | |
137 | ||
138 | static int get_fan_speed_index(struct gpio_fan_data *fan_data) | |
139 | { | |
140 | int ctrl_val = __get_fan_ctrl(fan_data); | |
141 | int i; | |
142 | ||
143 | for (i = 0; i < fan_data->num_speed; i++) | |
144 | if (fan_data->speed[i].ctrl_val == ctrl_val) | |
145 | return i; | |
146 | ||
8c0eb9bc | 147 | dev_warn(fan_data->dev, |
d6fe1360 SG |
148 | "missing speed array entry for GPIO value 0x%x\n", ctrl_val); |
149 | ||
c52ae3d2 | 150 | return -ENODEV; |
d6fe1360 SG |
151 | } |
152 | ||
2565fb05 | 153 | static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm) |
d6fe1360 SG |
154 | { |
155 | struct gpio_fan_speed *speed = fan_data->speed; | |
156 | int i; | |
157 | ||
158 | for (i = 0; i < fan_data->num_speed; i++) | |
159 | if (speed[i].rpm >= rpm) | |
160 | return i; | |
161 | ||
162 | return fan_data->num_speed - 1; | |
163 | } | |
164 | ||
c490c63e JL |
165 | static ssize_t pwm1_show(struct device *dev, struct device_attribute *attr, |
166 | char *buf) | |
d6fe1360 SG |
167 | { |
168 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
169 | u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1); | |
170 | ||
171 | return sprintf(buf, "%d\n", pwm); | |
172 | } | |
173 | ||
c490c63e JL |
174 | static ssize_t pwm1_store(struct device *dev, struct device_attribute *attr, |
175 | const char *buf, size_t count) | |
d6fe1360 SG |
176 | { |
177 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
178 | unsigned long pwm; | |
179 | int speed_index; | |
180 | int ret = count; | |
181 | ||
179c4fdb | 182 | if (kstrtoul(buf, 10, &pwm) || pwm > 255) |
d6fe1360 SG |
183 | return -EINVAL; |
184 | ||
185 | mutex_lock(&fan_data->lock); | |
186 | ||
187 | if (!fan_data->pwm_enable) { | |
188 | ret = -EPERM; | |
189 | goto exit_unlock; | |
190 | } | |
191 | ||
192 | speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255); | |
193 | set_fan_speed(fan_data, speed_index); | |
194 | ||
195 | exit_unlock: | |
196 | mutex_unlock(&fan_data->lock); | |
197 | ||
198 | return ret; | |
199 | } | |
200 | ||
c490c63e JL |
201 | static ssize_t pwm1_enable_show(struct device *dev, |
202 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
203 | { |
204 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
205 | ||
206 | return sprintf(buf, "%d\n", fan_data->pwm_enable); | |
207 | } | |
208 | ||
c490c63e JL |
209 | static ssize_t pwm1_enable_store(struct device *dev, |
210 | struct device_attribute *attr, | |
211 | const char *buf, size_t count) | |
d6fe1360 SG |
212 | { |
213 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
214 | unsigned long val; | |
215 | ||
179c4fdb | 216 | if (kstrtoul(buf, 10, &val) || val > 1) |
d6fe1360 SG |
217 | return -EINVAL; |
218 | ||
219 | if (fan_data->pwm_enable == val) | |
220 | return count; | |
221 | ||
222 | mutex_lock(&fan_data->lock); | |
223 | ||
224 | fan_data->pwm_enable = val; | |
225 | ||
226 | /* Disable manual control mode: set fan at full speed. */ | |
227 | if (val == 0) | |
228 | set_fan_speed(fan_data, fan_data->num_speed - 1); | |
229 | ||
230 | mutex_unlock(&fan_data->lock); | |
231 | ||
232 | return count; | |
233 | } | |
234 | ||
c490c63e JL |
235 | static ssize_t pwm1_mode_show(struct device *dev, |
236 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
237 | { |
238 | return sprintf(buf, "0\n"); | |
239 | } | |
240 | ||
c490c63e JL |
241 | static ssize_t fan1_min_show(struct device *dev, |
242 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
243 | { |
244 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
245 | ||
246 | return sprintf(buf, "%d\n", fan_data->speed[0].rpm); | |
247 | } | |
248 | ||
c490c63e JL |
249 | static ssize_t fan1_max_show(struct device *dev, |
250 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
251 | { |
252 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
253 | ||
254 | return sprintf(buf, "%d\n", | |
255 | fan_data->speed[fan_data->num_speed - 1].rpm); | |
256 | } | |
257 | ||
c490c63e JL |
258 | static ssize_t fan1_input_show(struct device *dev, |
259 | struct device_attribute *attr, char *buf) | |
d6fe1360 SG |
260 | { |
261 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
262 | ||
263 | return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm); | |
264 | } | |
265 | ||
266 | static ssize_t set_rpm(struct device *dev, struct device_attribute *attr, | |
267 | const char *buf, size_t count) | |
268 | { | |
269 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); | |
270 | unsigned long rpm; | |
271 | int ret = count; | |
272 | ||
179c4fdb | 273 | if (kstrtoul(buf, 10, &rpm)) |
d6fe1360 SG |
274 | return -EINVAL; |
275 | ||
276 | mutex_lock(&fan_data->lock); | |
277 | ||
278 | if (!fan_data->pwm_enable) { | |
279 | ret = -EPERM; | |
280 | goto exit_unlock; | |
281 | } | |
282 | ||
283 | set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm)); | |
284 | ||
285 | exit_unlock: | |
286 | mutex_unlock(&fan_data->lock); | |
287 | ||
288 | return ret; | |
289 | } | |
290 | ||
c490c63e JL |
291 | static DEVICE_ATTR_RW(pwm1); |
292 | static DEVICE_ATTR_RW(pwm1_enable); | |
293 | static DEVICE_ATTR_RO(pwm1_mode); | |
294 | static DEVICE_ATTR_RO(fan1_min); | |
295 | static DEVICE_ATTR_RO(fan1_max); | |
296 | static DEVICE_ATTR_RO(fan1_input); | |
905bc0d4 | 297 | static DEVICE_ATTR(fan1_target, 0644, fan1_input_show, set_rpm); |
d6fe1360 | 298 | |
c81cc5a4 GR |
299 | static umode_t gpio_fan_is_visible(struct kobject *kobj, |
300 | struct attribute *attr, int index) | |
301 | { | |
302 | struct device *dev = container_of(kobj, struct device, kobj); | |
303 | struct gpio_fan_data *data = dev_get_drvdata(dev); | |
304 | ||
c9933cb1 | 305 | if (index == 0 && !data->alarm_gpio) |
c81cc5a4 | 306 | return 0; |
e99c2e5d | 307 | if (index > 0 && !data->gpios) |
c81cc5a4 GR |
308 | return 0; |
309 | ||
310 | return attr->mode; | |
311 | } | |
312 | ||
313 | static struct attribute *gpio_fan_attributes[] = { | |
7258a125 GR |
314 | &dev_attr_fan1_alarm.attr, /* 0 */ |
315 | &dev_attr_pwm1.attr, /* 1 */ | |
d6fe1360 SG |
316 | &dev_attr_pwm1_enable.attr, |
317 | &dev_attr_pwm1_mode.attr, | |
318 | &dev_attr_fan1_input.attr, | |
319 | &dev_attr_fan1_target.attr, | |
320 | &dev_attr_fan1_min.attr, | |
321 | &dev_attr_fan1_max.attr, | |
322 | NULL | |
323 | }; | |
324 | ||
c81cc5a4 GR |
325 | static const struct attribute_group gpio_fan_group = { |
326 | .attrs = gpio_fan_attributes, | |
327 | .is_visible = gpio_fan_is_visible, | |
d6fe1360 SG |
328 | }; |
329 | ||
7258a125 GR |
330 | static const struct attribute_group *gpio_fan_groups[] = { |
331 | &gpio_fan_group, | |
332 | NULL | |
333 | }; | |
334 | ||
b5482f7e | 335 | static int fan_ctrl_init(struct gpio_fan_data *fan_data) |
d6fe1360 | 336 | { |
e99c2e5d | 337 | int num_gpios = fan_data->num_gpios; |
9de382fd | 338 | struct gpio_desc **gpios = fan_data->gpios; |
d6fe1360 SG |
339 | int i, err; |
340 | ||
e99c2e5d | 341 | for (i = 0; i < num_gpios; i++) { |
9de382fd LW |
342 | /* |
343 | * The GPIO descriptors were retrieved with GPIOD_ASIS so here | |
344 | * we set the GPIO into output mode, carefully preserving the | |
345 | * current value by setting it to whatever it is already set | |
346 | * (no surprise changes in default fan speed). | |
347 | */ | |
348 | err = gpiod_direction_output(gpios[i], | |
349 | gpiod_get_value_cansleep(gpios[i])); | |
d00985f3 GR |
350 | if (err) |
351 | return err; | |
d6fe1360 SG |
352 | } |
353 | ||
d6fe1360 SG |
354 | fan_data->pwm_enable = true; /* Enable manual fan speed control. */ |
355 | fan_data->speed_index = get_fan_speed_index(fan_data); | |
d00985f3 | 356 | if (fan_data->speed_index < 0) |
c52ae3d2 | 357 | return fan_data->speed_index; |
d6fe1360 | 358 | |
c81cc5a4 | 359 | return 0; |
d6fe1360 SG |
360 | } |
361 | ||
b5cf88e4 NM |
362 | static int gpio_fan_get_max_state(struct thermal_cooling_device *cdev, |
363 | unsigned long *state) | |
364 | { | |
365 | struct gpio_fan_data *fan_data = cdev->devdata; | |
366 | ||
367 | if (!fan_data) | |
368 | return -EINVAL; | |
369 | ||
370 | *state = fan_data->num_speed - 1; | |
371 | return 0; | |
372 | } | |
373 | ||
374 | static int gpio_fan_get_cur_state(struct thermal_cooling_device *cdev, | |
375 | unsigned long *state) | |
376 | { | |
377 | struct gpio_fan_data *fan_data = cdev->devdata; | |
b5cf88e4 NM |
378 | |
379 | if (!fan_data) | |
380 | return -EINVAL; | |
381 | ||
000e0949 | 382 | *state = fan_data->speed_index; |
b5cf88e4 NM |
383 | return 0; |
384 | } | |
385 | ||
386 | static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev, | |
387 | unsigned long state) | |
388 | { | |
389 | struct gpio_fan_data *fan_data = cdev->devdata; | |
390 | ||
391 | if (!fan_data) | |
392 | return -EINVAL; | |
393 | ||
394 | set_fan_speed(fan_data, state); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | static const struct thermal_cooling_device_ops gpio_fan_cool_ops = { | |
399 | .get_max_state = gpio_fan_get_max_state, | |
400 | .get_cur_state = gpio_fan_get_cur_state, | |
401 | .set_cur_state = gpio_fan_set_cur_state, | |
402 | }; | |
403 | ||
55fb8b06 JL |
404 | /* |
405 | * Translate OpenFirmware node properties into platform_data | |
406 | */ | |
b5482f7e | 407 | static int gpio_fan_get_of_data(struct gpio_fan_data *fan_data) |
55fb8b06 | 408 | { |
55fb8b06 | 409 | struct gpio_fan_speed *speed; |
b5482f7e LW |
410 | struct device *dev = fan_data->dev; |
411 | struct device_node *np = dev->of_node; | |
9de382fd | 412 | struct gpio_desc **gpios; |
55fb8b06 JL |
413 | unsigned i; |
414 | u32 u; | |
415 | struct property *prop; | |
416 | const __be32 *p; | |
417 | ||
73ef85f4 | 418 | /* Alarm GPIO if one exists */ |
9de382fd LW |
419 | fan_data->alarm_gpio = devm_gpiod_get_optional(dev, "alarm", GPIOD_IN); |
420 | if (IS_ERR(fan_data->alarm_gpio)) | |
421 | return PTR_ERR(fan_data->alarm_gpio); | |
73ef85f4 | 422 | |
55fb8b06 | 423 | /* Fill GPIO pin array */ |
9de382fd | 424 | fan_data->num_gpios = gpiod_count(dev, NULL); |
e99c2e5d | 425 | if (fan_data->num_gpios <= 0) { |
c9933cb1 | 426 | if (fan_data->alarm_gpio) |
73ef85f4 SG |
427 | return 0; |
428 | dev_err(dev, "DT properties empty / missing"); | |
55fb8b06 JL |
429 | return -ENODEV; |
430 | } | |
a86854d0 KC |
431 | gpios = devm_kcalloc(dev, |
432 | fan_data->num_gpios, sizeof(struct gpio_desc *), | |
9de382fd | 433 | GFP_KERNEL); |
e99c2e5d | 434 | if (!gpios) |
55fb8b06 | 435 | return -ENOMEM; |
e99c2e5d | 436 | for (i = 0; i < fan_data->num_gpios; i++) { |
9de382fd LW |
437 | gpios[i] = devm_gpiod_get_index(dev, NULL, i, GPIOD_ASIS); |
438 | if (IS_ERR(gpios[i])) | |
439 | return PTR_ERR(gpios[i]); | |
55fb8b06 | 440 | } |
e99c2e5d | 441 | fan_data->gpios = gpios; |
55fb8b06 JL |
442 | |
443 | /* Get number of RPM/ctrl_val pairs in speed map */ | |
b5482f7e | 444 | prop = of_find_property(np, "gpio-fan,speed-map", &i); |
55fb8b06 JL |
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 | } | |
b5482f7e | 454 | fan_data->num_speed = i / 2; |
55fb8b06 JL |
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 | */ | |
a86854d0 KC |
461 | speed = devm_kcalloc(dev, |
462 | fan_data->num_speed, sizeof(struct gpio_fan_speed), | |
55fb8b06 JL |
463 | GFP_KERNEL); |
464 | if (!speed) | |
465 | return -ENOMEM; | |
466 | p = NULL; | |
b5482f7e | 467 | for (i = 0; i < fan_data->num_speed; i++) { |
55fb8b06 JL |
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 | } | |
b5482f7e | 477 | fan_data->speed = speed; |
55fb8b06 | 478 | |
55fb8b06 JL |
479 | return 0; |
480 | } | |
481 | ||
6de709c5 | 482 | static const struct of_device_id of_gpio_fan_match[] = { |
55fb8b06 JL |
483 | { .compatible = "gpio-fan", }, |
484 | {}, | |
485 | }; | |
fe515288 | 486 | MODULE_DEVICE_TABLE(of, of_gpio_fan_match); |
55fb8b06 | 487 | |
95347845 GR |
488 | static void gpio_fan_stop(void *data) |
489 | { | |
490 | set_fan_speed(data, 0); | |
491 | } | |
492 | ||
6c931ae1 | 493 | static int gpio_fan_probe(struct platform_device *pdev) |
d6fe1360 SG |
494 | { |
495 | int err; | |
496 | struct gpio_fan_data *fan_data; | |
f9013c16 LW |
497 | struct device *dev = &pdev->dev; |
498 | struct device_node *np = dev->of_node; | |
d6fe1360 | 499 | |
f9013c16 | 500 | fan_data = devm_kzalloc(dev, sizeof(struct gpio_fan_data), |
b5cf88e4 NM |
501 | GFP_KERNEL); |
502 | if (!fan_data) | |
503 | return -ENOMEM; | |
504 | ||
534e28d8 | 505 | fan_data->dev = dev; |
b5482f7e | 506 | err = gpio_fan_get_of_data(fan_data); |
a9b4c8af LW |
507 | if (err) |
508 | return err; | |
d6fe1360 | 509 | |
d6fe1360 SG |
510 | platform_set_drvdata(pdev, fan_data); |
511 | mutex_init(&fan_data->lock); | |
512 | ||
d6fe1360 | 513 | /* Configure control GPIOs if available. */ |
e99c2e5d | 514 | if (fan_data->gpios && fan_data->num_gpios > 0) { |
b5482f7e | 515 | if (!fan_data->speed || fan_data->num_speed <= 1) |
c81cc5a4 | 516 | return -EINVAL; |
b5482f7e | 517 | err = fan_ctrl_init(fan_data); |
d6fe1360 | 518 | if (err) |
c81cc5a4 | 519 | return err; |
b9bb92e1 GR |
520 | err = devm_add_action_or_reset(dev, gpio_fan_stop, fan_data); |
521 | if (err) | |
522 | return err; | |
d6fe1360 SG |
523 | } |
524 | ||
d6fe1360 | 525 | /* Make this driver part of hwmon class. */ |
49153b09 | 526 | fan_data->hwmon_dev = |
f9013c16 | 527 | devm_hwmon_device_register_with_groups(dev, |
49153b09 AL |
528 | "gpio_fan", fan_data, |
529 | gpio_fan_groups); | |
7258a125 GR |
530 | if (IS_ERR(fan_data->hwmon_dev)) |
531 | return PTR_ERR(fan_data->hwmon_dev); | |
a9b4c8af | 532 | |
f2173fa2 CS |
533 | /* Configure alarm GPIO if available. */ |
534 | if (fan_data->alarm_gpio) { | |
535 | err = fan_alarm_init(fan_data); | |
536 | if (err) | |
537 | return err; | |
538 | } | |
539 | ||
e76ea261 | 540 | /* Optional cooling device register for Device tree platforms */ |
95347845 GR |
541 | fan_data->cdev = devm_thermal_of_cooling_device_register(dev, np, |
542 | "gpio-fan", fan_data, &gpio_fan_cool_ops); | |
d6fe1360 | 543 | |
f9013c16 | 544 | dev_info(dev, "GPIO fan initialized\n"); |
d6fe1360 SG |
545 | |
546 | return 0; | |
d6fe1360 SG |
547 | } |
548 | ||
95347845 | 549 | static void gpio_fan_shutdown(struct platform_device *pdev) |
b95579cd | 550 | { |
b5cf88e4 NM |
551 | struct gpio_fan_data *fan_data = platform_get_drvdata(pdev); |
552 | ||
e99c2e5d | 553 | if (fan_data->gpios) |
b95579cd NM |
554 | set_fan_speed(fan_data, 0); |
555 | } | |
556 | ||
6d20a6c0 RW |
557 | #ifdef CONFIG_PM_SLEEP |
558 | static int gpio_fan_suspend(struct device *dev) | |
d6fe1360 | 559 | { |
6d20a6c0 | 560 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 | 561 | |
e99c2e5d | 562 | if (fan_data->gpios) { |
d6fe1360 SG |
563 | fan_data->resume_speed = fan_data->speed_index; |
564 | set_fan_speed(fan_data, 0); | |
565 | } | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
6d20a6c0 | 570 | static int gpio_fan_resume(struct device *dev) |
d6fe1360 | 571 | { |
6d20a6c0 | 572 | struct gpio_fan_data *fan_data = dev_get_drvdata(dev); |
d6fe1360 | 573 | |
e99c2e5d | 574 | if (fan_data->gpios) |
d6fe1360 SG |
575 | set_fan_speed(fan_data, fan_data->resume_speed); |
576 | ||
577 | return 0; | |
578 | } | |
6d20a6c0 RW |
579 | |
580 | static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume); | |
24f9c539 | 581 | #define GPIO_FAN_PM (&gpio_fan_pm) |
d6fe1360 | 582 | #else |
6d20a6c0 | 583 | #define GPIO_FAN_PM NULL |
d6fe1360 SG |
584 | #endif |
585 | ||
586 | static struct platform_driver gpio_fan_driver = { | |
587 | .probe = gpio_fan_probe, | |
b95579cd | 588 | .shutdown = gpio_fan_shutdown, |
d6fe1360 SG |
589 | .driver = { |
590 | .name = "gpio-fan", | |
6d20a6c0 | 591 | .pm = GPIO_FAN_PM, |
55fb8b06 | 592 | .of_match_table = of_match_ptr(of_gpio_fan_match), |
d6fe1360 SG |
593 | }, |
594 | }; | |
595 | ||
25a236a5 | 596 | module_platform_driver(gpio_fan_driver); |
d6fe1360 SG |
597 | |
598 | MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>"); | |
599 | MODULE_DESCRIPTION("GPIO FAN driver"); | |
600 | MODULE_LICENSE("GPL"); | |
601 | MODULE_ALIAS("platform:gpio-fan"); |