1d2912cb1SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
2c72a1d60SRichard Purdie /*
3c72a1d60SRichard Purdie * LED Class Core
4c72a1d60SRichard Purdie *
5c72a1d60SRichard Purdie * Copyright 2005-2006 Openedhand Ltd.
6c72a1d60SRichard Purdie *
7c72a1d60SRichard Purdie * Author: Richard Purdie <rpurdie@openedhand.com>
8c72a1d60SRichard Purdie */
9c72a1d60SRichard Purdie
10c72a1d60SRichard Purdie #include <linux/kernel.h>
1104713306SJacek Anaszewski #include <linux/leds.h>
12c72a1d60SRichard Purdie #include <linux/list.h>
13c72a1d60SRichard Purdie #include <linux/module.h>
1404713306SJacek Anaszewski #include <linux/mutex.h>
158e1f4561SKrzysztof Kozlowski #include <linux/of.h>
16bb4e9af0SJacek Anaszewski #include <linux/property.h>
1772f8da32SRichard Purdie #include <linux/rwsem.h>
188e1f4561SKrzysztof Kozlowski #include <linux/slab.h>
19bb4e9af0SJacek Anaszewski #include <uapi/linux/uleds.h>
20c72a1d60SRichard Purdie #include "leds.h"
21c72a1d60SRichard Purdie
2272f8da32SRichard Purdie DECLARE_RWSEM(leds_list_lock);
23c72a1d60SRichard Purdie EXPORT_SYMBOL_GPL(leds_list_lock);
244d404fd5SNémeth Márton
254d404fd5SNémeth Márton LIST_HEAD(leds_list);
264d404fd5SNémeth Márton EXPORT_SYMBOL_GPL(leds_list);
27a403d930SBryan Wu
28bb4e9af0SJacek Anaszewski const char * const led_colors[LED_COLOR_ID_MAX] = {
29bb4e9af0SJacek Anaszewski [LED_COLOR_ID_WHITE] = "white",
30bb4e9af0SJacek Anaszewski [LED_COLOR_ID_RED] = "red",
31bb4e9af0SJacek Anaszewski [LED_COLOR_ID_GREEN] = "green",
32bb4e9af0SJacek Anaszewski [LED_COLOR_ID_BLUE] = "blue",
33bb4e9af0SJacek Anaszewski [LED_COLOR_ID_AMBER] = "amber",
34bb4e9af0SJacek Anaszewski [LED_COLOR_ID_VIOLET] = "violet",
35bb4e9af0SJacek Anaszewski [LED_COLOR_ID_YELLOW] = "yellow",
36bb4e9af0SJacek Anaszewski [LED_COLOR_ID_IR] = "ir",
3710d3e0d8SDan Murphy [LED_COLOR_ID_MULTI] = "multicolor",
3854212f5aSPavel Machek [LED_COLOR_ID_RGB] = "rgb",
39bb4e9af0SJacek Anaszewski };
40bb4e9af0SJacek Anaszewski EXPORT_SYMBOL_GPL(led_colors);
41bb4e9af0SJacek Anaszewski
__led_set_brightness(struct led_classdev * led_cdev,unsigned int value)42af0bfab9SAbanoub Sameh static int __led_set_brightness(struct led_classdev *led_cdev, unsigned int value)
43d4887af9SHeiner Kallweit {
44d4887af9SHeiner Kallweit if (!led_cdev->brightness_set)
45d4887af9SHeiner Kallweit return -ENOTSUPP;
46d4887af9SHeiner Kallweit
47d4887af9SHeiner Kallweit led_cdev->brightness_set(led_cdev, value);
48d4887af9SHeiner Kallweit
49d4887af9SHeiner Kallweit return 0;
50d4887af9SHeiner Kallweit }
51d4887af9SHeiner Kallweit
__led_set_brightness_blocking(struct led_classdev * led_cdev,unsigned int value)52af0bfab9SAbanoub Sameh static int __led_set_brightness_blocking(struct led_classdev *led_cdev, unsigned int value)
53d4887af9SHeiner Kallweit {
54d4887af9SHeiner Kallweit if (!led_cdev->brightness_set_blocking)
55d4887af9SHeiner Kallweit return -ENOTSUPP;
56d4887af9SHeiner Kallweit
57d4887af9SHeiner Kallweit return led_cdev->brightness_set_blocking(led_cdev, value);
58d4887af9SHeiner Kallweit }
59d4887af9SHeiner Kallweit
led_timer_function(struct timer_list * t)6049404665SKees Cook static void led_timer_function(struct timer_list *t)
61757b06aeSJacek Anaszewski {
6249404665SKees Cook struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer);
63757b06aeSJacek Anaszewski unsigned long brightness;
64757b06aeSJacek Anaszewski unsigned long delay;
65757b06aeSJacek Anaszewski
66757b06aeSJacek Anaszewski if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
6781fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, LED_OFF);
68a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
69757b06aeSJacek Anaszewski return;
70757b06aeSJacek Anaszewski }
71757b06aeSJacek Anaszewski
72a9c6ce57SHans de Goede if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP,
73a9c6ce57SHans de Goede &led_cdev->work_flags)) {
74a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
75757b06aeSJacek Anaszewski return;
76757b06aeSJacek Anaszewski }
77757b06aeSJacek Anaszewski
78757b06aeSJacek Anaszewski brightness = led_get_brightness(led_cdev);
79757b06aeSJacek Anaszewski if (!brightness) {
80757b06aeSJacek Anaszewski /* Time to switch the LED on. */
81eb1610b4SHans de Goede if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE,
82eb1610b4SHans de Goede &led_cdev->work_flags))
83eb1610b4SHans de Goede brightness = led_cdev->new_blink_brightness;
84eb1610b4SHans de Goede else
85757b06aeSJacek Anaszewski brightness = led_cdev->blink_brightness;
86757b06aeSJacek Anaszewski delay = led_cdev->blink_delay_on;
87757b06aeSJacek Anaszewski } else {
88757b06aeSJacek Anaszewski /* Store the current brightness value to be able
89757b06aeSJacek Anaszewski * to restore it when the delay_off period is over.
90757b06aeSJacek Anaszewski */
91757b06aeSJacek Anaszewski led_cdev->blink_brightness = brightness;
92757b06aeSJacek Anaszewski brightness = LED_OFF;
93757b06aeSJacek Anaszewski delay = led_cdev->blink_delay_off;
94757b06aeSJacek Anaszewski }
95757b06aeSJacek Anaszewski
9681fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, brightness);
97757b06aeSJacek Anaszewski
98757b06aeSJacek Anaszewski /* Return in next iteration if led is in one-shot mode and we are in
99757b06aeSJacek Anaszewski * the final blink state so that the led is toggled each delay_on +
100757b06aeSJacek Anaszewski * delay_off milliseconds in worst case.
101757b06aeSJacek Anaszewski */
102a9c6ce57SHans de Goede if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) {
103a9c6ce57SHans de Goede if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) {
104757b06aeSJacek Anaszewski if (brightness)
105a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT_STOP,
106a9c6ce57SHans de Goede &led_cdev->work_flags);
107757b06aeSJacek Anaszewski } else {
108757b06aeSJacek Anaszewski if (!brightness)
109a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT_STOP,
110a9c6ce57SHans de Goede &led_cdev->work_flags);
111757b06aeSJacek Anaszewski }
112757b06aeSJacek Anaszewski }
113757b06aeSJacek Anaszewski
114757b06aeSJacek Anaszewski mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
115757b06aeSJacek Anaszewski }
116757b06aeSJacek Anaszewski
set_brightness_delayed_set_brightness(struct led_classdev * led_cdev,unsigned int value)117fa15d8c6SHans de Goede static void set_brightness_delayed_set_brightness(struct led_classdev *led_cdev,
118fa15d8c6SHans de Goede unsigned int value)
119757b06aeSJacek Anaszewski {
1201afcadfcSJacek Anaszewski int ret = 0;
121757b06aeSJacek Anaszewski
122fa15d8c6SHans de Goede ret = __led_set_brightness(led_cdev, value);
123d4887af9SHeiner Kallweit if (ret == -ENOTSUPP)
124fa15d8c6SHans de Goede ret = __led_set_brightness_blocking(led_cdev, value);
125d84d80f3SHeiner Kallweit if (ret < 0 &&
126d84d80f3SHeiner Kallweit /* LED HW might have been unplugged, therefore don't warn */
127d84d80f3SHeiner Kallweit !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) &&
128d84d80f3SHeiner Kallweit (led_cdev->flags & LED_HW_PLUGGABLE)))
1291afcadfcSJacek Anaszewski dev_err(led_cdev->dev,
1301afcadfcSJacek Anaszewski "Setting an LED's brightness failed (%d)\n", ret);
131757b06aeSJacek Anaszewski }
132757b06aeSJacek Anaszewski
set_brightness_delayed(struct work_struct * ws)133fa15d8c6SHans de Goede static void set_brightness_delayed(struct work_struct *ws)
134fa15d8c6SHans de Goede {
135fa15d8c6SHans de Goede struct led_classdev *led_cdev =
136fa15d8c6SHans de Goede container_of(ws, struct led_classdev, set_brightness_work);
137fa15d8c6SHans de Goede
138fa15d8c6SHans de Goede if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) {
139fa15d8c6SHans de Goede led_stop_software_blink(led_cdev);
140fa15d8c6SHans de Goede set_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags);
141fa15d8c6SHans de Goede }
142fa15d8c6SHans de Goede
143fa15d8c6SHans de Goede /*
144fa15d8c6SHans de Goede * Triggers may call led_set_brightness(LED_OFF),
145fa15d8c6SHans de Goede * led_set_brightness(LED_FULL) in quick succession to disable blinking
146fa15d8c6SHans de Goede * and turn the LED on. Both actions may have been scheduled to run
147fa15d8c6SHans de Goede * before this work item runs once. To make sure this works properly
148fa15d8c6SHans de Goede * handle LED_SET_BRIGHTNESS_OFF first.
149fa15d8c6SHans de Goede */
150fa15d8c6SHans de Goede if (test_and_clear_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags))
151fa15d8c6SHans de Goede set_brightness_delayed_set_brightness(led_cdev, LED_OFF);
152fa15d8c6SHans de Goede
153fa15d8c6SHans de Goede if (test_and_clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags))
154fa15d8c6SHans de Goede set_brightness_delayed_set_brightness(led_cdev, led_cdev->delayed_set_value);
155*22720a87SHans de Goede
156*22720a87SHans de Goede if (test_and_clear_bit(LED_SET_BLINK, &led_cdev->work_flags)) {
157*22720a87SHans de Goede unsigned long delay_on = led_cdev->delayed_delay_on;
158*22720a87SHans de Goede unsigned long delay_off = led_cdev->delayed_delay_off;
159*22720a87SHans de Goede
160*22720a87SHans de Goede led_blink_set(led_cdev, &delay_on, &delay_off);
161*22720a87SHans de Goede }
162fa15d8c6SHans de Goede }
163fa15d8c6SHans de Goede
led_set_software_blink(struct led_classdev * led_cdev,unsigned long delay_on,unsigned long delay_off)164a403d930SBryan Wu static void led_set_software_blink(struct led_classdev *led_cdev,
165a403d930SBryan Wu unsigned long delay_on,
166a403d930SBryan Wu unsigned long delay_off)
167a403d930SBryan Wu {
168a403d930SBryan Wu int current_brightness;
169a403d930SBryan Wu
170a403d930SBryan Wu current_brightness = led_get_brightness(led_cdev);
171a403d930SBryan Wu if (current_brightness)
172a403d930SBryan Wu led_cdev->blink_brightness = current_brightness;
173a403d930SBryan Wu if (!led_cdev->blink_brightness)
174a403d930SBryan Wu led_cdev->blink_brightness = led_cdev->max_brightness;
175a403d930SBryan Wu
176a403d930SBryan Wu led_cdev->blink_delay_on = delay_on;
177a403d930SBryan Wu led_cdev->blink_delay_off = delay_off;
178a403d930SBryan Wu
1798d82fef8SStefan Sørensen /* never on - just set to off */
1808d82fef8SStefan Sørensen if (!delay_on) {
18181fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, LED_OFF);
182a403d930SBryan Wu return;
1838d82fef8SStefan Sørensen }
184a403d930SBryan Wu
185a403d930SBryan Wu /* never off - just set to brightness */
186a403d930SBryan Wu if (!delay_off) {
18781fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev,
18881fe8e5bSJacek Anaszewski led_cdev->blink_brightness);
189a403d930SBryan Wu return;
190a403d930SBryan Wu }
191a403d930SBryan Wu
192a9c6ce57SHans de Goede set_bit(LED_BLINK_SW, &led_cdev->work_flags);
1939067359fSJiri Kosina mod_timer(&led_cdev->blink_timer, jiffies + 1);
194a403d930SBryan Wu }
195a403d930SBryan Wu
196a403d930SBryan Wu
led_blink_setup(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)19720c0e6b8SBryan Wu static void led_blink_setup(struct led_classdev *led_cdev,
198a403d930SBryan Wu unsigned long *delay_on,
199a403d930SBryan Wu unsigned long *delay_off)
200a403d930SBryan Wu {
201a9c6ce57SHans de Goede if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
2025bb629c5SFabio Baltieri led_cdev->blink_set &&
203a403d930SBryan Wu !led_cdev->blink_set(led_cdev, delay_on, delay_off))
204a403d930SBryan Wu return;
205a403d930SBryan Wu
206a403d930SBryan Wu /* blink with 1 Hz as default if nothing specified */
207a403d930SBryan Wu if (!*delay_on && !*delay_off)
208a403d930SBryan Wu *delay_on = *delay_off = 500;
209a403d930SBryan Wu
210a403d930SBryan Wu led_set_software_blink(led_cdev, *delay_on, *delay_off);
211a403d930SBryan Wu }
2125bb629c5SFabio Baltieri
led_init_core(struct led_classdev * led_cdev)213757b06aeSJacek Anaszewski void led_init_core(struct led_classdev *led_cdev)
214757b06aeSJacek Anaszewski {
215757b06aeSJacek Anaszewski INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
216757b06aeSJacek Anaszewski
21749404665SKees Cook timer_setup(&led_cdev->blink_timer, led_timer_function, 0);
218757b06aeSJacek Anaszewski }
219757b06aeSJacek Anaszewski EXPORT_SYMBOL_GPL(led_init_core);
220757b06aeSJacek Anaszewski
led_blink_set(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off)2215bb629c5SFabio Baltieri void led_blink_set(struct led_classdev *led_cdev,
2225bb629c5SFabio Baltieri unsigned long *delay_on,
2235bb629c5SFabio Baltieri unsigned long *delay_off)
2245bb629c5SFabio Baltieri {
2257b6af2c5SJacek Anaszewski del_timer_sync(&led_cdev->blink_timer);
2265bb629c5SFabio Baltieri
2277b6af2c5SJacek Anaszewski clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
228a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
229a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
2305bb629c5SFabio Baltieri
2315bb629c5SFabio Baltieri led_blink_setup(led_cdev, delay_on, delay_off);
2325bb629c5SFabio Baltieri }
2332806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_blink_set);
234a403d930SBryan Wu
led_blink_set_oneshot(struct led_classdev * led_cdev,unsigned long * delay_on,unsigned long * delay_off,int invert)2355bb629c5SFabio Baltieri void led_blink_set_oneshot(struct led_classdev *led_cdev,
2365bb629c5SFabio Baltieri unsigned long *delay_on,
2375bb629c5SFabio Baltieri unsigned long *delay_off,
2385bb629c5SFabio Baltieri int invert)
2395bb629c5SFabio Baltieri {
240a9c6ce57SHans de Goede if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
2419067359fSJiri Kosina timer_pending(&led_cdev->blink_timer))
2425bb629c5SFabio Baltieri return;
2435bb629c5SFabio Baltieri
244a9c6ce57SHans de Goede set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
245a9c6ce57SHans de Goede clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
2465bb629c5SFabio Baltieri
2475bb629c5SFabio Baltieri if (invert)
248a9c6ce57SHans de Goede set_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
2495bb629c5SFabio Baltieri else
250a9c6ce57SHans de Goede clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
2515bb629c5SFabio Baltieri
2525bb629c5SFabio Baltieri led_blink_setup(led_cdev, delay_on, delay_off);
2535bb629c5SFabio Baltieri }
2542806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_blink_set_oneshot);
2555bb629c5SFabio Baltieri
led_blink_set_nosleep(struct led_classdev * led_cdev,unsigned long delay_on,unsigned long delay_off)256*22720a87SHans de Goede void led_blink_set_nosleep(struct led_classdev *led_cdev, unsigned long delay_on,
257*22720a87SHans de Goede unsigned long delay_off)
258*22720a87SHans de Goede {
259*22720a87SHans de Goede /* If necessary delegate to a work queue task. */
260*22720a87SHans de Goede if (led_cdev->blink_set && led_cdev->brightness_set_blocking) {
261*22720a87SHans de Goede led_cdev->delayed_delay_on = delay_on;
262*22720a87SHans de Goede led_cdev->delayed_delay_off = delay_off;
263*22720a87SHans de Goede set_bit(LED_SET_BLINK, &led_cdev->work_flags);
264*22720a87SHans de Goede schedule_work(&led_cdev->set_brightness_work);
265*22720a87SHans de Goede return;
266*22720a87SHans de Goede }
267*22720a87SHans de Goede
268*22720a87SHans de Goede led_blink_set(led_cdev, &delay_on, &delay_off);
269*22720a87SHans de Goede }
270*22720a87SHans de Goede EXPORT_SYMBOL_GPL(led_blink_set_nosleep);
271*22720a87SHans de Goede
led_stop_software_blink(struct led_classdev * led_cdev)272d23a22a7SFabio Baltieri void led_stop_software_blink(struct led_classdev *led_cdev)
273a403d930SBryan Wu {
2749067359fSJiri Kosina del_timer_sync(&led_cdev->blink_timer);
27543786482SFabio Baltieri led_cdev->blink_delay_on = 0;
27643786482SFabio Baltieri led_cdev->blink_delay_off = 0;
277a9c6ce57SHans de Goede clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
278d23a22a7SFabio Baltieri }
279d23a22a7SFabio Baltieri EXPORT_SYMBOL_GPL(led_stop_software_blink);
280d23a22a7SFabio Baltieri
led_set_brightness(struct led_classdev * led_cdev,unsigned int brightness)281af0bfab9SAbanoub Sameh void led_set_brightness(struct led_classdev *led_cdev, unsigned int brightness)
282d23a22a7SFabio Baltieri {
283f1e80c07SJacek Anaszewski /*
2847cfe749fSTony Makkiel * If software blink is active, delay brightness setting
285f1e80c07SJacek Anaszewski * until the next timer tick.
286f1e80c07SJacek Anaszewski */
287a9c6ce57SHans de Goede if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) {
288f1e80c07SJacek Anaszewski /*
289f1e80c07SJacek Anaszewski * If we need to disable soft blinking delegate this to the
290f1e80c07SJacek Anaszewski * work queue task to avoid problems in case we are called
291f1e80c07SJacek Anaszewski * from hard irq context.
292f1e80c07SJacek Anaszewski */
293af0bfab9SAbanoub Sameh if (!brightness) {
294a9c6ce57SHans de Goede set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags);
295d23a22a7SFabio Baltieri schedule_work(&led_cdev->set_brightness_work);
296f1e80c07SJacek Anaszewski } else {
297a9c6ce57SHans de Goede set_bit(LED_BLINK_BRIGHTNESS_CHANGE,
298a9c6ce57SHans de Goede &led_cdev->work_flags);
299eb1610b4SHans de Goede led_cdev->new_blink_brightness = brightness;
300f1e80c07SJacek Anaszewski }
301d23a22a7SFabio Baltieri return;
302d23a22a7SFabio Baltieri }
30343786482SFabio Baltieri
30481fe8e5bSJacek Anaszewski led_set_brightness_nosleep(led_cdev, brightness);
305a403d930SBryan Wu }
3062806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness);
3073ef7de53SJacek Anaszewski
led_set_brightness_nopm(struct led_classdev * led_cdev,unsigned int value)308af0bfab9SAbanoub Sameh void led_set_brightness_nopm(struct led_classdev *led_cdev, unsigned int value)
30981fe8e5bSJacek Anaszewski {
31081fe8e5bSJacek Anaszewski /* Use brightness_set op if available, it is guaranteed not to sleep */
311d4887af9SHeiner Kallweit if (!__led_set_brightness(led_cdev, value))
31281fe8e5bSJacek Anaszewski return;
31381fe8e5bSJacek Anaszewski
314fa15d8c6SHans de Goede /*
315fa15d8c6SHans de Goede * Brightness setting can sleep, delegate it to a work queue task.
316fa15d8c6SHans de Goede * value 0 / LED_OFF is special, since it also disables hw-blinking
317fa15d8c6SHans de Goede * (sw-blink disable is handled in led_set_brightness()).
318fa15d8c6SHans de Goede * To avoid a hw-blink-disable getting lost when a second brightness
319fa15d8c6SHans de Goede * change is done immediately afterwards (before the work runs),
320fa15d8c6SHans de Goede * it uses a separate work_flag.
321fa15d8c6SHans de Goede */
322fa15d8c6SHans de Goede if (value) {
32381fe8e5bSJacek Anaszewski led_cdev->delayed_set_value = value;
324fa15d8c6SHans de Goede set_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags);
325fa15d8c6SHans de Goede } else {
326fa15d8c6SHans de Goede clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags);
327*22720a87SHans de Goede clear_bit(LED_SET_BLINK, &led_cdev->work_flags);
328fa15d8c6SHans de Goede set_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags);
329fa15d8c6SHans de Goede }
330fa15d8c6SHans de Goede
33181fe8e5bSJacek Anaszewski schedule_work(&led_cdev->set_brightness_work);
33281fe8e5bSJacek Anaszewski }
33381fe8e5bSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_nopm);
33481fe8e5bSJacek Anaszewski
led_set_brightness_nosleep(struct led_classdev * led_cdev,unsigned int value)335af0bfab9SAbanoub Sameh void led_set_brightness_nosleep(struct led_classdev *led_cdev, unsigned int value)
33681fe8e5bSJacek Anaszewski {
33781fe8e5bSJacek Anaszewski led_cdev->brightness = min(value, led_cdev->max_brightness);
33881fe8e5bSJacek Anaszewski
33981fe8e5bSJacek Anaszewski if (led_cdev->flags & LED_SUSPENDED)
34081fe8e5bSJacek Anaszewski return;
34181fe8e5bSJacek Anaszewski
34281fe8e5bSJacek Anaszewski led_set_brightness_nopm(led_cdev, led_cdev->brightness);
34381fe8e5bSJacek Anaszewski }
34481fe8e5bSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
34581fe8e5bSJacek Anaszewski
led_set_brightness_sync(struct led_classdev * led_cdev,unsigned int value)346af0bfab9SAbanoub Sameh int led_set_brightness_sync(struct led_classdev *led_cdev, unsigned int value)
34713ae79bbSJacek Anaszewski {
34813ae79bbSJacek Anaszewski if (led_cdev->blink_delay_on || led_cdev->blink_delay_off)
34913ae79bbSJacek Anaszewski return -EBUSY;
35013ae79bbSJacek Anaszewski
35113ae79bbSJacek Anaszewski led_cdev->brightness = min(value, led_cdev->max_brightness);
35213ae79bbSJacek Anaszewski
35313ae79bbSJacek Anaszewski if (led_cdev->flags & LED_SUSPENDED)
35413ae79bbSJacek Anaszewski return 0;
35513ae79bbSJacek Anaszewski
356d4887af9SHeiner Kallweit return __led_set_brightness_blocking(led_cdev, led_cdev->brightness);
35713ae79bbSJacek Anaszewski }
35813ae79bbSJacek Anaszewski EXPORT_SYMBOL_GPL(led_set_brightness_sync);
35913ae79bbSJacek Anaszewski
led_update_brightness(struct led_classdev * led_cdev)3603ef7de53SJacek Anaszewski int led_update_brightness(struct led_classdev *led_cdev)
3613ef7de53SJacek Anaszewski {
3623ef7de53SJacek Anaszewski int ret = 0;
3633ef7de53SJacek Anaszewski
3643ef7de53SJacek Anaszewski if (led_cdev->brightness_get) {
3653ef7de53SJacek Anaszewski ret = led_cdev->brightness_get(led_cdev);
3663ef7de53SJacek Anaszewski if (ret >= 0) {
3673ef7de53SJacek Anaszewski led_cdev->brightness = ret;
3683ef7de53SJacek Anaszewski return 0;
3693ef7de53SJacek Anaszewski }
3703ef7de53SJacek Anaszewski }
3713ef7de53SJacek Anaszewski
3723ef7de53SJacek Anaszewski return ret;
3733ef7de53SJacek Anaszewski }
3742806e2ffSJacek Anaszewski EXPORT_SYMBOL_GPL(led_update_brightness);
375acd899e4SJacek Anaszewski
led_get_default_pattern(struct led_classdev * led_cdev,unsigned int * size)3768e1f4561SKrzysztof Kozlowski u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)
3778e1f4561SKrzysztof Kozlowski {
378fd81d7e9SAndy Shevchenko struct fwnode_handle *fwnode = led_cdev->dev->fwnode;
3798e1f4561SKrzysztof Kozlowski u32 *pattern;
3808e1f4561SKrzysztof Kozlowski int count;
3818e1f4561SKrzysztof Kozlowski
382fd81d7e9SAndy Shevchenko count = fwnode_property_count_u32(fwnode, "led-pattern");
3838e1f4561SKrzysztof Kozlowski if (count < 0)
3848e1f4561SKrzysztof Kozlowski return NULL;
3858e1f4561SKrzysztof Kozlowski
3868e1f4561SKrzysztof Kozlowski pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
3878e1f4561SKrzysztof Kozlowski if (!pattern)
3888e1f4561SKrzysztof Kozlowski return NULL;
3898e1f4561SKrzysztof Kozlowski
390fd81d7e9SAndy Shevchenko if (fwnode_property_read_u32_array(fwnode, "led-pattern", pattern, count)) {
3918e1f4561SKrzysztof Kozlowski kfree(pattern);
3928e1f4561SKrzysztof Kozlowski return NULL;
3938e1f4561SKrzysztof Kozlowski }
3948e1f4561SKrzysztof Kozlowski
3958e1f4561SKrzysztof Kozlowski *size = count;
3968e1f4561SKrzysztof Kozlowski
3978e1f4561SKrzysztof Kozlowski return pattern;
3988e1f4561SKrzysztof Kozlowski }
3998e1f4561SKrzysztof Kozlowski EXPORT_SYMBOL_GPL(led_get_default_pattern);
4008e1f4561SKrzysztof Kozlowski
401acd899e4SJacek Anaszewski /* Caller must ensure led_cdev->led_access held */
led_sysfs_disable(struct led_classdev * led_cdev)402acd899e4SJacek Anaszewski void led_sysfs_disable(struct led_classdev *led_cdev)
403acd899e4SJacek Anaszewski {
404acd899e4SJacek Anaszewski lockdep_assert_held(&led_cdev->led_access);
405acd899e4SJacek Anaszewski
406acd899e4SJacek Anaszewski led_cdev->flags |= LED_SYSFS_DISABLE;
407acd899e4SJacek Anaszewski }
408acd899e4SJacek Anaszewski EXPORT_SYMBOL_GPL(led_sysfs_disable);
409acd899e4SJacek Anaszewski
410acd899e4SJacek Anaszewski /* Caller must ensure led_cdev->led_access held */
led_sysfs_enable(struct led_classdev * led_cdev)411acd899e4SJacek Anaszewski void led_sysfs_enable(struct led_classdev *led_cdev)
412acd899e4SJacek Anaszewski {
413acd899e4SJacek Anaszewski lockdep_assert_held(&led_cdev->led_access);
414acd899e4SJacek Anaszewski
415acd899e4SJacek Anaszewski led_cdev->flags &= ~LED_SYSFS_DISABLE;
416acd899e4SJacek Anaszewski }
417acd899e4SJacek Anaszewski EXPORT_SYMBOL_GPL(led_sysfs_enable);
418bb4e9af0SJacek Anaszewski
led_parse_fwnode_props(struct device * dev,struct fwnode_handle * fwnode,struct led_properties * props)419bb4e9af0SJacek Anaszewski static void led_parse_fwnode_props(struct device *dev,
420bb4e9af0SJacek Anaszewski struct fwnode_handle *fwnode,
421bb4e9af0SJacek Anaszewski struct led_properties *props)
422bb4e9af0SJacek Anaszewski {
423bb4e9af0SJacek Anaszewski int ret;
424bb4e9af0SJacek Anaszewski
425bb4e9af0SJacek Anaszewski if (!fwnode)
426bb4e9af0SJacek Anaszewski return;
427bb4e9af0SJacek Anaszewski
428bb4e9af0SJacek Anaszewski if (fwnode_property_present(fwnode, "label")) {
429bb4e9af0SJacek Anaszewski ret = fwnode_property_read_string(fwnode, "label", &props->label);
430bb4e9af0SJacek Anaszewski if (ret)
431bb4e9af0SJacek Anaszewski dev_err(dev, "Error parsing 'label' property (%d)\n", ret);
432bb4e9af0SJacek Anaszewski return;
433bb4e9af0SJacek Anaszewski }
434bb4e9af0SJacek Anaszewski
435bb4e9af0SJacek Anaszewski if (fwnode_property_present(fwnode, "color")) {
436bb4e9af0SJacek Anaszewski ret = fwnode_property_read_u32(fwnode, "color", &props->color);
437bb4e9af0SJacek Anaszewski if (ret)
438bb4e9af0SJacek Anaszewski dev_err(dev, "Error parsing 'color' property (%d)\n", ret);
439bb4e9af0SJacek Anaszewski else if (props->color >= LED_COLOR_ID_MAX)
440bb4e9af0SJacek Anaszewski dev_err(dev, "LED color identifier out of range\n");
441bb4e9af0SJacek Anaszewski else
442bb4e9af0SJacek Anaszewski props->color_present = true;
443bb4e9af0SJacek Anaszewski }
444bb4e9af0SJacek Anaszewski
445bb4e9af0SJacek Anaszewski
446bb4e9af0SJacek Anaszewski if (!fwnode_property_present(fwnode, "function"))
447bb4e9af0SJacek Anaszewski return;
448bb4e9af0SJacek Anaszewski
449bb4e9af0SJacek Anaszewski ret = fwnode_property_read_string(fwnode, "function", &props->function);
450bb4e9af0SJacek Anaszewski if (ret) {
451bb4e9af0SJacek Anaszewski dev_err(dev,
452bb4e9af0SJacek Anaszewski "Error parsing 'function' property (%d)\n",
453bb4e9af0SJacek Anaszewski ret);
454bb4e9af0SJacek Anaszewski }
455bb4e9af0SJacek Anaszewski
456bb4e9af0SJacek Anaszewski if (!fwnode_property_present(fwnode, "function-enumerator"))
457bb4e9af0SJacek Anaszewski return;
458bb4e9af0SJacek Anaszewski
459bb4e9af0SJacek Anaszewski ret = fwnode_property_read_u32(fwnode, "function-enumerator",
460bb4e9af0SJacek Anaszewski &props->func_enum);
461bb4e9af0SJacek Anaszewski if (ret) {
462bb4e9af0SJacek Anaszewski dev_err(dev,
463bb4e9af0SJacek Anaszewski "Error parsing 'function-enumerator' property (%d)\n",
464bb4e9af0SJacek Anaszewski ret);
465bb4e9af0SJacek Anaszewski } else {
466bb4e9af0SJacek Anaszewski props->func_enum_present = true;
467bb4e9af0SJacek Anaszewski }
468bb4e9af0SJacek Anaszewski }
469bb4e9af0SJacek Anaszewski
led_compose_name(struct device * dev,struct led_init_data * init_data,char * led_classdev_name)470bb4e9af0SJacek Anaszewski int led_compose_name(struct device *dev, struct led_init_data *init_data,
471bb4e9af0SJacek Anaszewski char *led_classdev_name)
472bb4e9af0SJacek Anaszewski {
473bb4e9af0SJacek Anaszewski struct led_properties props = {};
474bb4e9af0SJacek Anaszewski struct fwnode_handle *fwnode = init_data->fwnode;
475bb4e9af0SJacek Anaszewski const char *devicename = init_data->devicename;
476bb4e9af0SJacek Anaszewski
477bb4e9af0SJacek Anaszewski if (!led_classdev_name)
478bb4e9af0SJacek Anaszewski return -EINVAL;
479bb4e9af0SJacek Anaszewski
480bb4e9af0SJacek Anaszewski led_parse_fwnode_props(dev, fwnode, &props);
481bb4e9af0SJacek Anaszewski
482bb4e9af0SJacek Anaszewski if (props.label) {
483bb4e9af0SJacek Anaszewski /*
484bb4e9af0SJacek Anaszewski * If init_data.devicename is NULL, then it indicates that
485bb4e9af0SJacek Anaszewski * DT label should be used as-is for LED class device name.
486bb4e9af0SJacek Anaszewski * Otherwise the label is prepended with devicename to compose
487bb4e9af0SJacek Anaszewski * the final LED class device name.
488bb4e9af0SJacek Anaszewski */
489bb4e9af0SJacek Anaszewski if (!devicename) {
490bb4e9af0SJacek Anaszewski strscpy(led_classdev_name, props.label,
491bb4e9af0SJacek Anaszewski LED_MAX_NAME_SIZE);
492bb4e9af0SJacek Anaszewski } else {
493bb4e9af0SJacek Anaszewski snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
494bb4e9af0SJacek Anaszewski devicename, props.label);
495bb4e9af0SJacek Anaszewski }
496bb4e9af0SJacek Anaszewski } else if (props.function || props.color_present) {
497bb4e9af0SJacek Anaszewski char tmp_buf[LED_MAX_NAME_SIZE];
498bb4e9af0SJacek Anaszewski
499bb4e9af0SJacek Anaszewski if (props.func_enum_present) {
500bb4e9af0SJacek Anaszewski snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s-%d",
501bb4e9af0SJacek Anaszewski props.color_present ? led_colors[props.color] : "",
502bb4e9af0SJacek Anaszewski props.function ?: "", props.func_enum);
503bb4e9af0SJacek Anaszewski } else {
504bb4e9af0SJacek Anaszewski snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s",
505bb4e9af0SJacek Anaszewski props.color_present ? led_colors[props.color] : "",
506bb4e9af0SJacek Anaszewski props.function ?: "");
507bb4e9af0SJacek Anaszewski }
508bb4e9af0SJacek Anaszewski if (init_data->devname_mandatory) {
509bb4e9af0SJacek Anaszewski snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
510bb4e9af0SJacek Anaszewski devicename, tmp_buf);
511bb4e9af0SJacek Anaszewski } else {
512bb4e9af0SJacek Anaszewski strscpy(led_classdev_name, tmp_buf, LED_MAX_NAME_SIZE);
513bb4e9af0SJacek Anaszewski
514bb4e9af0SJacek Anaszewski }
515bb4e9af0SJacek Anaszewski } else if (init_data->default_label) {
516bb4e9af0SJacek Anaszewski if (!devicename) {
517bb4e9af0SJacek Anaszewski dev_err(dev, "Legacy LED naming requires devicename segment");
518bb4e9af0SJacek Anaszewski return -EINVAL;
519bb4e9af0SJacek Anaszewski }
520bb4e9af0SJacek Anaszewski snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
521bb4e9af0SJacek Anaszewski devicename, init_data->default_label);
522bb4e9af0SJacek Anaszewski } else if (is_of_node(fwnode)) {
523bb4e9af0SJacek Anaszewski strscpy(led_classdev_name, to_of_node(fwnode)->name,
524bb4e9af0SJacek Anaszewski LED_MAX_NAME_SIZE);
525bb4e9af0SJacek Anaszewski } else
526bb4e9af0SJacek Anaszewski return -EINVAL;
527bb4e9af0SJacek Anaszewski
528bb4e9af0SJacek Anaszewski return 0;
529bb4e9af0SJacek Anaszewski }
530bb4e9af0SJacek Anaszewski EXPORT_SYMBOL_GPL(led_compose_name);
531791bc411SDenis Osterland-Heim
led_init_default_state_get(struct fwnode_handle * fwnode)532791bc411SDenis Osterland-Heim enum led_default_state led_init_default_state_get(struct fwnode_handle *fwnode)
533791bc411SDenis Osterland-Heim {
534791bc411SDenis Osterland-Heim const char *state = NULL;
535791bc411SDenis Osterland-Heim
536791bc411SDenis Osterland-Heim if (!fwnode_property_read_string(fwnode, "default-state", &state)) {
537791bc411SDenis Osterland-Heim if (!strcmp(state, "keep"))
538791bc411SDenis Osterland-Heim return LEDS_DEFSTATE_KEEP;
539791bc411SDenis Osterland-Heim if (!strcmp(state, "on"))
540791bc411SDenis Osterland-Heim return LEDS_DEFSTATE_ON;
541791bc411SDenis Osterland-Heim }
542791bc411SDenis Osterland-Heim
543791bc411SDenis Osterland-Heim return LEDS_DEFSTATE_OFF;
544791bc411SDenis Osterland-Heim }
545791bc411SDenis Osterland-Heim EXPORT_SYMBOL_GPL(led_init_default_state_get);
546