[linux-2.6-block.git] / drivers / leds / led-core.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * LED Class Core
 *
 * Copyright 2005-2006 Openedhand Ltd.
 *
 * Author: Richard Purdie <rpurdie@openedhand.com>
 */

#include <linux/kernel.h>
#include <linux/leds.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/property.h>
#include <linux/rwsem.h>
#include <linux/slab.h>
#include <uapi/linux/uleds.h>
#include "leds.h"

DECLARE_RWSEM(leds_list_lock);
EXPORT_SYMBOL_GPL(leds_list_lock);

LIST_HEAD(leds_list);
EXPORT_SYMBOL_GPL(leds_list);

const char * const led_colors[LED_COLOR_ID_MAX] = {
	[LED_COLOR_ID_WHITE] = "white",
	[LED_COLOR_ID_RED] = "red",
	[LED_COLOR_ID_GREEN] = "green",
	[LED_COLOR_ID_BLUE] = "blue",
	[LED_COLOR_ID_AMBER] = "amber",
	[LED_COLOR_ID_VIOLET] = "violet",
	[LED_COLOR_ID_YELLOW] = "yellow",
	[LED_COLOR_ID_IR] = "ir",
};
EXPORT_SYMBOL_GPL(led_colors);

static int __led_set_brightness(struct led_classdev *led_cdev,
				enum led_brightness value)
{
	if (!led_cdev->brightness_set)
		return -ENOTSUPP;

	led_cdev->brightness_set(led_cdev, value);

	return 0;
}

static int __led_set_brightness_blocking(struct led_classdev *led_cdev,
					 enum led_brightness value)
{
	if (!led_cdev->brightness_set_blocking)
		return -ENOTSUPP;

	return led_cdev->brightness_set_blocking(led_cdev, value);
}

static void led_timer_function(struct timer_list *t)
{
	struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer);
	unsigned long brightness;
	unsigned long delay;

	if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
		led_set_brightness_nosleep(led_cdev, LED_OFF);
		clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
		return;
	}

	if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP,
			       &led_cdev->work_flags)) {
		clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
		return;
	}

	brightness = led_get_brightness(led_cdev);
	if (!brightness) {
		/* Time to switch the LED on. */
		if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE,
					&led_cdev->work_flags))
			brightness = led_cdev->new_blink_brightness;
		else
			brightness = led_cdev->blink_brightness;
		delay = led_cdev->blink_delay_on;
	} else {
		/* Store the current brightness value to be able
		 * to restore it when the delay_off period is over.
		 */
		led_cdev->blink_brightness = brightness;
		brightness = LED_OFF;
		delay = led_cdev->blink_delay_off;
	}

	led_set_brightness_nosleep(led_cdev, brightness);

	/* Return in next iteration if led is in one-shot mode and we are in
	 * the final blink state so that the led is toggled each delay_on +
	 * delay_off milliseconds in worst case.
	 */
	if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) {
		if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) {
			if (brightness)
				set_bit(LED_BLINK_ONESHOT_STOP,
					&led_cdev->work_flags);
		} else {
			if (!brightness)
				set_bit(LED_BLINK_ONESHOT_STOP,
					&led_cdev->work_flags);
		}
	}

	mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
}

static void set_brightness_delayed(struct work_struct *ws)
{
	struct led_classdev *led_cdev =
		container_of(ws, struct led_classdev, set_brightness_work);
	int ret = 0;

	if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) {
		led_cdev->delayed_set_value = LED_OFF;
		led_stop_software_blink(led_cdev);
	}

	ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value);
	if (ret == -ENOTSUPP)
		ret = __led_set_brightness_blocking(led_cdev,
					led_cdev->delayed_set_value);
	if (ret < 0 &&
	    /* LED HW might have been unplugged, therefore don't warn */
	    !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) &&
	    (led_cdev->flags & LED_HW_PLUGGABLE)))
		dev_err(led_cdev->dev,
			"Setting an LED's brightness failed (%d)\n", ret);
}

static void led_set_software_blink(struct led_classdev *led_cdev,
				   unsigned long delay_on,
				   unsigned long delay_off)
{
	int current_brightness;

	current_brightness = led_get_brightness(led_cdev);
	if (current_brightness)
		led_cdev->blink_brightness = current_brightness;
	if (!led_cdev->blink_brightness)
		led_cdev->blink_brightness = led_cdev->max_brightness;

	led_cdev->blink_delay_on = delay_on;
	led_cdev->blink_delay_off = delay_off;

	/* never on - just set to off */
	if (!delay_on) {
		led_set_brightness_nosleep(led_cdev, LED_OFF);
		return;
	}

	/* never off - just set to brightness */
	if (!delay_off) {
		led_set_brightness_nosleep(led_cdev,
					   led_cdev->blink_brightness);
		return;
	}

	set_bit(LED_BLINK_SW, &led_cdev->work_flags);
	mod_timer(&led_cdev->blink_timer, jiffies + 1);
}


static void led_blink_setup(struct led_classdev *led_cdev,
		     unsigned long *delay_on,
		     unsigned long *delay_off)
{
	if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
	    led_cdev->blink_set &&
	    !led_cdev->blink_set(led_cdev, delay_on, delay_off))
		return;

	/* blink with 1 Hz as default if nothing specified */
	if (!*delay_on && !*delay_off)
		*delay_on = *delay_off = 500;

	led_set_software_blink(led_cdev, *delay_on, *delay_off);
}

void led_init_core(struct led_classdev *led_cdev)
{
	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);

	timer_setup(&led_cdev->blink_timer, led_timer_function, 0);
}
EXPORT_SYMBOL_GPL(led_init_core);

void led_blink_set(struct led_classdev *led_cdev,
		   unsigned long *delay_on,
		   unsigned long *delay_off)
{
	del_timer_sync(&led_cdev->blink_timer);

	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
	clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);

	led_blink_setup(led_cdev, delay_on, delay_off);
}
EXPORT_SYMBOL_GPL(led_blink_set);

void led_blink_set_oneshot(struct led_classdev *led_cdev,
			   unsigned long *delay_on,
			   unsigned long *delay_off,
			   int invert)
{
	if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
	     timer_pending(&led_cdev->blink_timer))
		return;

	set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);

	if (invert)
		set_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
	else
		clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags);

	led_blink_setup(led_cdev, delay_on, delay_off);
}
EXPORT_SYMBOL_GPL(led_blink_set_oneshot);

void led_stop_software_blink(struct led_classdev *led_cdev)
{
	del_timer_sync(&led_cdev->blink_timer);
	led_cdev->blink_delay_on = 0;
	led_cdev->blink_delay_off = 0;
	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
}
EXPORT_SYMBOL_GPL(led_stop_software_blink);

void led_set_brightness(struct led_classdev *led_cdev,
			enum led_brightness brightness)
{
	/*
	 * If software blink is active, delay brightness setting
	 * until the next timer tick.
	 */
	if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) {
		/*
		 * If we need to disable soft blinking delegate this to the
		 * work queue task to avoid problems in case we are called
		 * from hard irq context.
		 */
		if (brightness == LED_OFF) {
			set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags);
			schedule_work(&led_cdev->set_brightness_work);
		} else {
			set_bit(LED_BLINK_BRIGHTNESS_CHANGE,
				&led_cdev->work_flags);
			led_cdev->new_blink_brightness = brightness;
		}
		return;
	}

	led_set_brightness_nosleep(led_cdev, brightness);
}
EXPORT_SYMBOL_GPL(led_set_brightness);

void led_set_brightness_nopm(struct led_classdev *led_cdev,
			      enum led_brightness value)
{
	/* Use brightness_set op if available, it is guaranteed not to sleep */
	if (!__led_set_brightness(led_cdev, value))
		return;

	/* If brightness setting can sleep, delegate it to a work queue task */
	led_cdev->delayed_set_value = value;
	schedule_work(&led_cdev->set_brightness_work);
}
EXPORT_SYMBOL_GPL(led_set_brightness_nopm);

void led_set_brightness_nosleep(struct led_classdev *led_cdev,
				enum led_brightness value)
{
	led_cdev->brightness = min(value, led_cdev->max_brightness);

	if (led_cdev->flags & LED_SUSPENDED)
		return;

	led_set_brightness_nopm(led_cdev, led_cdev->brightness);
}
EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);

int led_set_brightness_sync(struct led_classdev *led_cdev,
			    enum led_brightness value)
{
	if (led_cdev->blink_delay_on || led_cdev->blink_delay_off)
		return -EBUSY;

	led_cdev->brightness = min(value, led_cdev->max_brightness);

	if (led_cdev->flags & LED_SUSPENDED)
		return 0;

	return __led_set_brightness_blocking(led_cdev, led_cdev->brightness);
}
EXPORT_SYMBOL_GPL(led_set_brightness_sync);

int led_update_brightness(struct led_classdev *led_cdev)
{
	int ret = 0;

	if (led_cdev->brightness_get) {
		ret = led_cdev->brightness_get(led_cdev);
		if (ret >= 0) {
			led_cdev->brightness = ret;
			return 0;
		}
	}

	return ret;
}
EXPORT_SYMBOL_GPL(led_update_brightness);

u32 *led_get_default_pattern(struct led_classdev *led_cdev, unsigned int *size)
{
	struct fwnode_handle *fwnode = led_cdev->dev->fwnode;
	u32 *pattern;
	int count;

	count = fwnode_property_count_u32(fwnode, "led-pattern");
	if (count < 0)
		return NULL;

	pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
	if (!pattern)
		return NULL;

	if (fwnode_property_read_u32_array(fwnode, "led-pattern", pattern, count)) {
		kfree(pattern);
		return NULL;
	}

	*size = count;

	return pattern;
}
EXPORT_SYMBOL_GPL(led_get_default_pattern);

/* Caller must ensure led_cdev->led_access held */
void led_sysfs_disable(struct led_classdev *led_cdev)
{
	lockdep_assert_held(&led_cdev->led_access);

	led_cdev->flags |= LED_SYSFS_DISABLE;
}
EXPORT_SYMBOL_GPL(led_sysfs_disable);

/* Caller must ensure led_cdev->led_access held */
void led_sysfs_enable(struct led_classdev *led_cdev)
{
	lockdep_assert_held(&led_cdev->led_access);

	led_cdev->flags &= ~LED_SYSFS_DISABLE;
}
EXPORT_SYMBOL_GPL(led_sysfs_enable);

static void led_parse_fwnode_props(struct device *dev,
				   struct fwnode_handle *fwnode,
				   struct led_properties *props)
{
	int ret;

	if (!fwnode)
		return;

	if (fwnode_property_present(fwnode, "label")) {
		ret = fwnode_property_read_string(fwnode, "label", &props->label);
		if (ret)
			dev_err(dev, "Error parsing 'label' property (%d)\n", ret);
		return;
	}

	if (fwnode_property_present(fwnode, "color")) {
		ret = fwnode_property_read_u32(fwnode, "color", &props->color);
		if (ret)
			dev_err(dev, "Error parsing 'color' property (%d)\n", ret);
		else if (props->color >= LED_COLOR_ID_MAX)
			dev_err(dev, "LED color identifier out of range\n");
		else
			props->color_present = true;
	}


	if (!fwnode_property_present(fwnode, "function"))
		return;

	ret = fwnode_property_read_string(fwnode, "function", &props->function);
	if (ret) {
		dev_err(dev,
			"Error parsing 'function' property (%d)\n",
			ret);
	}

	if (!fwnode_property_present(fwnode, "function-enumerator"))
		return;

	ret = fwnode_property_read_u32(fwnode, "function-enumerator",
				       &props->func_enum);
	if (ret) {
		dev_err(dev,
			"Error parsing 'function-enumerator' property (%d)\n",
			ret);
	} else {
		props->func_enum_present = true;
	}
}

int led_compose_name(struct device *dev, struct led_init_data *init_data,
		     char *led_classdev_name)
{
	struct led_properties props = {};
	struct fwnode_handle *fwnode = init_data->fwnode;
	const char *devicename = init_data->devicename;

	if (!led_classdev_name)
		return -EINVAL;

	led_parse_fwnode_props(dev, fwnode, &props);

	if (props.label) {
		/*
		 * If init_data.devicename is NULL, then it indicates that
		 * DT label should be used as-is for LED class device name.
		 * Otherwise the label is prepended with devicename to compose
		 * the final LED class device name.
		 */
		if (!devicename) {
			strscpy(led_classdev_name, props.label,
				LED_MAX_NAME_SIZE);
		} else {
			snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
				 devicename, props.label);
		}
	} else if (props.function || props.color_present) {
		char tmp_buf[LED_MAX_NAME_SIZE];

		if (props.func_enum_present) {
			snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s-%d",
				 props.color_present ? led_colors[props.color] : "",
				 props.function ?: "", props.func_enum);
		} else {
			snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s",
				 props.color_present ? led_colors[props.color] : "",
				 props.function ?: "");
		}
		if (init_data->devname_mandatory) {
			snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
				 devicename, tmp_buf);
		} else {
			strscpy(led_classdev_name, tmp_buf, LED_MAX_NAME_SIZE);

		}
	} else if (init_data->default_label) {
		if (!devicename) {
			dev_err(dev, "Legacy LED naming requires devicename segment");
			return -EINVAL;
		}
		snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
			 devicename, init_data->default_label);
	} else if (is_of_node(fwnode)) {
		strscpy(led_classdev_name, to_of_node(fwnode)->name,
			LED_MAX_NAME_SIZE);
	} else
		return -EINVAL;

	return 0;
}
EXPORT_SYMBOL_GPL(led_compose_name);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
c72a1d60 RP	2	/*
	3	* LED Class Core
	4	*
	5	* Copyright 2005-2006 Openedhand Ltd.
	6	*
	7	* Author: Richard Purdie <rpurdie@openedhand.com>
c72a1d60 RP	8	*/
	9
	10	#include <linux/kernel.h>
04713306	11	#include <linux/leds.h>
c72a1d60 RP	12	#include <linux/list.h>
c72a1d60 RP	13	#include <linux/module.h>
04713306	14	#include <linux/mutex.h>
8e1f4561	15	#include <linux/of.h>
bb4e9af0	16	#include <linux/property.h>
72f8da32	17	#include <linux/rwsem.h>
8e1f4561	18	#include <linux/slab.h>
bb4e9af0	19	#include <uapi/linux/uleds.h>
c72a1d60 RP	20	#include "leds.h"
c72a1d60 RP	21
72f8da32	22	DECLARE_RWSEM(leds_list_lock);
4d404fd5	23	EXPORT_SYMBOL_GPL(leds_list_lock);
c72a1d60	24
4d404fd5	25	LIST_HEAD(leds_list);
c72a1d60	26	EXPORT_SYMBOL_GPL(leds_list);
a403d930	27
bb4e9af0 JA	28	const char * const led_colors[LED_COLOR_ID_MAX] = {
	29	[LED_COLOR_ID_WHITE] = "white",
	30	[LED_COLOR_ID_RED] = "red",
	31	[LED_COLOR_ID_GREEN] = "green",
	32	[LED_COLOR_ID_BLUE] = "blue",
	33	[LED_COLOR_ID_AMBER] = "amber",
	34	[LED_COLOR_ID_VIOLET] = "violet",
	35	[LED_COLOR_ID_YELLOW] = "yellow",
	36	[LED_COLOR_ID_IR] = "ir",
	37	};
	38	EXPORT_SYMBOL_GPL(led_colors);
	39
d4887af9 HK	40	static int __led_set_brightness(struct led_classdev *led_cdev,
	41	enum led_brightness value)
	42	{
	43	if (!led_cdev->brightness_set)
	44	return -ENOTSUPP;
	45
	46	led_cdev->brightness_set(led_cdev, value);
	47
	48	return 0;
	49	}
	50
	51	static int __led_set_brightness_blocking(struct led_classdev *led_cdev,
	52	enum led_brightness value)
	53	{
	54	if (!led_cdev->brightness_set_blocking)
	55	return -ENOTSUPP;
	56
	57	return led_cdev->brightness_set_blocking(led_cdev, value);
	58	}
	59
49404665	60	static void led_timer_function(struct timer_list *t)
757b06ae	61	{
49404665	62	struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer);
757b06ae JA	63	unsigned long brightness;
	64	unsigned long delay;
	65
	66	if (!led_cdev->blink_delay_on \|\| !led_cdev->blink_delay_off) {
81fe8e5b	67	led_set_brightness_nosleep(led_cdev, LED_OFF);
a9c6ce57	68	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
757b06ae JA	69	return;
	70	}
	71
a9c6ce57 HG	72	if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP,
	73	&led_cdev->work_flags)) {
	74	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
757b06ae JA	75	return;
	76	}
	77
	78	brightness = led_get_brightness(led_cdev);
	79	if (!brightness) {
	80	/* Time to switch the LED on. */
eb1610b4 HG	81	if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE,
	82	&led_cdev->work_flags))
	83	brightness = led_cdev->new_blink_brightness;
	84	else
	85	brightness = led_cdev->blink_brightness;
757b06ae JA	86	delay = led_cdev->blink_delay_on;
	87	} else {
	88	/* Store the current brightness value to be able
	89	* to restore it when the delay_off period is over.
	90	*/
eb1610b4	91	led_cdev->blink_brightness = brightness;
757b06ae JA	92	brightness = LED_OFF;
	93	delay = led_cdev->blink_delay_off;
	94	}
	95
81fe8e5b	96	led_set_brightness_nosleep(led_cdev, brightness);
757b06ae JA	97
	98	/* Return in next iteration if led is in one-shot mode and we are in
	99	* the final blink state so that the led is toggled each delay_on +
	100	* delay_off milliseconds in worst case.
	101	*/
a9c6ce57 HG	102	if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) {
a9c6ce57 HG	103	if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) {
757b06ae	104	if (brightness)
a9c6ce57 HG	105	set_bit(LED_BLINK_ONESHOT_STOP,
a9c6ce57 HG	106	&led_cdev->work_flags);
757b06ae JA	107	} else {
757b06ae JA	108	if (!brightness)
a9c6ce57 HG	109	set_bit(LED_BLINK_ONESHOT_STOP,
a9c6ce57 HG	110	&led_cdev->work_flags);
757b06ae JA	111	}
	112	}
	113
	114	mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
	115	}
	116
	117	static void set_brightness_delayed(struct work_struct *ws)
	118	{
	119	struct led_classdev *led_cdev =
	120	container_of(ws, struct led_classdev, set_brightness_work);
1afcadfc	121	int ret = 0;
757b06ae	122
a9c6ce57	123	if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) {
f1e80c07 JA	124	led_cdev->delayed_set_value = LED_OFF;
f1e80c07 JA	125	led_stop_software_blink(led_cdev);
f1e80c07	126	}
757b06ae	127
d4887af9 HK	128	ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value);
	129	if (ret == -ENOTSUPP)
	130	ret = __led_set_brightness_blocking(led_cdev,
	131	led_cdev->delayed_set_value);
d84d80f3 HK	132	if (ret < 0 &&
	133	/* LED HW might have been unplugged, therefore don't warn */
	134	!(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) &&
	135	(led_cdev->flags & LED_HW_PLUGGABLE)))
1afcadfc JA	136	dev_err(led_cdev->dev,
1afcadfc JA	137	"Setting an LED's brightness failed (%d)\n", ret);
757b06ae JA	138	}
757b06ae JA	139
a403d930 BW	140	static void led_set_software_blink(struct led_classdev *led_cdev,
	141	unsigned long delay_on,
	142	unsigned long delay_off)
	143	{
	144	int current_brightness;
	145
	146	current_brightness = led_get_brightness(led_cdev);
	147	if (current_brightness)
	148	led_cdev->blink_brightness = current_brightness;
	149	if (!led_cdev->blink_brightness)
	150	led_cdev->blink_brightness = led_cdev->max_brightness;
	151
a403d930 BW	152	led_cdev->blink_delay_on = delay_on;
	153	led_cdev->blink_delay_off = delay_off;
	154
8d82fef8 SS	155	/* never on - just set to off */
8d82fef8 SS	156	if (!delay_on) {
81fe8e5b	157	led_set_brightness_nosleep(led_cdev, LED_OFF);
a403d930	158	return;
8d82fef8	159	}
a403d930 BW	160
	161	/* never off - just set to brightness */
	162	if (!delay_off) {
81fe8e5b JA	163	led_set_brightness_nosleep(led_cdev,
81fe8e5b JA	164	led_cdev->blink_brightness);
a403d930 BW	165	return;
	166	}
	167
a9c6ce57	168	set_bit(LED_BLINK_SW, &led_cdev->work_flags);
9067359f	169	mod_timer(&led_cdev->blink_timer, jiffies + 1);
a403d930 BW	170	}
	171
	172
20c0e6b8	173	static void led_blink_setup(struct led_classdev *led_cdev,
5bb629c5 FB	174	unsigned long *delay_on,
5bb629c5 FB	175	unsigned long *delay_off)
a403d930	176	{
a9c6ce57	177	if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
5bb629c5	178	led_cdev->blink_set &&
a403d930 BW	179	!led_cdev->blink_set(led_cdev, delay_on, delay_off))
	180	return;
	181
	182	/* blink with 1 Hz as default if nothing specified */
	183	if (!delay_on && !delay_off)
	184	delay_on = delay_off = 500;
	185
	186	led_set_software_blink(led_cdev, delay_on, delay_off);
	187	}
5bb629c5	188
757b06ae JA	189	void led_init_core(struct led_classdev *led_cdev)
	190	{
	191	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
	192
49404665	193	timer_setup(&led_cdev->blink_timer, led_timer_function, 0);
757b06ae JA	194	}
	195	EXPORT_SYMBOL_GPL(led_init_core);
	196
5bb629c5 FB	197	void led_blink_set(struct led_classdev *led_cdev,
	198	unsigned long *delay_on,
	199	unsigned long *delay_off)
	200	{
7b6af2c5	201	del_timer_sync(&led_cdev->blink_timer);
5bb629c5	202
7b6af2c5	203	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
a9c6ce57 HG	204	clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
a9c6ce57 HG	205	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
5bb629c5 FB	206
	207	led_blink_setup(led_cdev, delay_on, delay_off);
	208	}
2806e2ff	209	EXPORT_SYMBOL_GPL(led_blink_set);
a403d930	210
5bb629c5 FB	211	void led_blink_set_oneshot(struct led_classdev *led_cdev,
	212	unsigned long *delay_on,
	213	unsigned long *delay_off,
	214	int invert)
	215	{
a9c6ce57	216	if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
9067359f	217	timer_pending(&led_cdev->blink_timer))
5bb629c5 FB	218	return;
5bb629c5 FB	219
a9c6ce57 HG	220	set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
a9c6ce57 HG	221	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
5bb629c5 FB	222
5bb629c5 FB	223	if (invert)
a9c6ce57	224	set_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
5bb629c5	225	else
a9c6ce57	226	clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
5bb629c5 FB	227
	228	led_blink_setup(led_cdev, delay_on, delay_off);
	229	}
2806e2ff	230	EXPORT_SYMBOL_GPL(led_blink_set_oneshot);
5bb629c5	231
d23a22a7	232	void led_stop_software_blink(struct led_classdev *led_cdev)
a403d930	233	{
9067359f	234	del_timer_sync(&led_cdev->blink_timer);
43786482 FB	235	led_cdev->blink_delay_on = 0;
43786482 FB	236	led_cdev->blink_delay_off = 0;
a9c6ce57	237	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
d23a22a7 FB	238	}
	239	EXPORT_SYMBOL_GPL(led_stop_software_blink);
	240
	241	void led_set_brightness(struct led_classdev *led_cdev,
	242	enum led_brightness brightness)
	243	{
f1e80c07	244	/*
7cfe749f	245	* If software blink is active, delay brightness setting
f1e80c07 JA	246	* until the next timer tick.
f1e80c07 JA	247	*/
a9c6ce57	248	if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) {
f1e80c07 JA	249	/*
	250	* If we need to disable soft blinking delegate this to the
	251	* work queue task to avoid problems in case we are called
	252	* from hard irq context.
	253	*/
	254	if (brightness == LED_OFF) {
a9c6ce57	255	set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags);
76931edd	256	schedule_work(&led_cdev->set_brightness_work);
f1e80c07	257	} else {
a9c6ce57 HG	258	set_bit(LED_BLINK_BRIGHTNESS_CHANGE,
a9c6ce57 HG	259	&led_cdev->work_flags);
eb1610b4	260	led_cdev->new_blink_brightness = brightness;
f1e80c07	261	}
d23a22a7 FB	262	return;
d23a22a7 FB	263	}
43786482	264
13ae79bb	265	led_set_brightness_nosleep(led_cdev, brightness);
a403d930	266	}
2806e2ff	267	EXPORT_SYMBOL_GPL(led_set_brightness);
3ef7de53	268
81fe8e5b JA	269	void led_set_brightness_nopm(struct led_classdev *led_cdev,
	270	enum led_brightness value)
	271	{
	272	/* Use brightness_set op if available, it is guaranteed not to sleep */
d4887af9	273	if (!__led_set_brightness(led_cdev, value))
81fe8e5b	274	return;
81fe8e5b JA	275
	276	/* If brightness setting can sleep, delegate it to a work queue task */
	277	led_cdev->delayed_set_value = value;
	278	schedule_work(&led_cdev->set_brightness_work);
	279	}
	280	EXPORT_SYMBOL_GPL(led_set_brightness_nopm);
	281
	282	void led_set_brightness_nosleep(struct led_classdev *led_cdev,
	283	enum led_brightness value)
	284	{
	285	led_cdev->brightness = min(value, led_cdev->max_brightness);
	286
	287	if (led_cdev->flags & LED_SUSPENDED)
	288	return;
	289
	290	led_set_brightness_nopm(led_cdev, led_cdev->brightness);
	291	}
	292	EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
	293
13ae79bb JA	294	int led_set_brightness_sync(struct led_classdev *led_cdev,
	295	enum led_brightness value)
	296	{
	297	if (led_cdev->blink_delay_on \|\| led_cdev->blink_delay_off)
	298	return -EBUSY;
	299
	300	led_cdev->brightness = min(value, led_cdev->max_brightness);
	301
	302	if (led_cdev->flags & LED_SUSPENDED)
	303	return 0;
	304
d4887af9	305	return __led_set_brightness_blocking(led_cdev, led_cdev->brightness);
13ae79bb JA	306	}
	307	EXPORT_SYMBOL_GPL(led_set_brightness_sync);
	308
3ef7de53 JA	309	int led_update_brightness(struct led_classdev *led_cdev)
	310	{
	311	int ret = 0;
	312
	313	if (led_cdev->brightness_get) {
	314	ret = led_cdev->brightness_get(led_cdev);
	315	if (ret >= 0) {
	316	led_cdev->brightness = ret;
	317	return 0;
	318	}
	319	}
	320
	321	return ret;
	322	}
2806e2ff	323	EXPORT_SYMBOL_GPL(led_update_brightness);
acd899e4	324
8e1f4561 KK	325	u32 led_get_default_pattern(struct led_classdev led_cdev, unsigned int *size)
8e1f4561 KK	326	{
fd81d7e9	327	struct fwnode_handle *fwnode = led_cdev->dev->fwnode;
8e1f4561 KK	328	u32 *pattern;
	329	int count;
	330
fd81d7e9	331	count = fwnode_property_count_u32(fwnode, "led-pattern");
8e1f4561 KK	332	if (count < 0)
	333	return NULL;
	334
	335	pattern = kcalloc(count, sizeof(*pattern), GFP_KERNEL);
	336	if (!pattern)
	337	return NULL;
	338
fd81d7e9	339	if (fwnode_property_read_u32_array(fwnode, "led-pattern", pattern, count)) {
8e1f4561 KK	340	kfree(pattern);
	341	return NULL;
	342	}
	343
	344	*size = count;
	345
	346	return pattern;
	347	}
	348	EXPORT_SYMBOL_GPL(led_get_default_pattern);
	349
acd899e4 JA	350	/* Caller must ensure led_cdev->led_access held */
	351	void led_sysfs_disable(struct led_classdev *led_cdev)
	352	{
	353	lockdep_assert_held(&led_cdev->led_access);
	354
	355	led_cdev->flags \|= LED_SYSFS_DISABLE;
	356	}
	357	EXPORT_SYMBOL_GPL(led_sysfs_disable);
	358
	359	/* Caller must ensure led_cdev->led_access held */
	360	void led_sysfs_enable(struct led_classdev *led_cdev)
	361	{
	362	lockdep_assert_held(&led_cdev->led_access);
	363
	364	led_cdev->flags &= ~LED_SYSFS_DISABLE;
	365	}
	366	EXPORT_SYMBOL_GPL(led_sysfs_enable);
bb4e9af0 JA	367
	368	static void led_parse_fwnode_props(struct device *dev,
	369	struct fwnode_handle *fwnode,
	370	struct led_properties *props)
	371	{
	372	int ret;
	373
	374	if (!fwnode)
	375	return;
	376
	377	if (fwnode_property_present(fwnode, "label")) {
	378	ret = fwnode_property_read_string(fwnode, "label", &props->label);
	379	if (ret)
	380	dev_err(dev, "Error parsing 'label' property (%d)\n", ret);
	381	return;
	382	}
	383
	384	if (fwnode_property_present(fwnode, "color")) {
	385	ret = fwnode_property_read_u32(fwnode, "color", &props->color);
	386	if (ret)
	387	dev_err(dev, "Error parsing 'color' property (%d)\n", ret);
	388	else if (props->color >= LED_COLOR_ID_MAX)
	389	dev_err(dev, "LED color identifier out of range\n");
	390	else
	391	props->color_present = true;
	392	}
	393
	394
	395	if (!fwnode_property_present(fwnode, "function"))
	396	return;
	397
	398	ret = fwnode_property_read_string(fwnode, "function", &props->function);
	399	if (ret) {
	400	dev_err(dev,
	401	"Error parsing 'function' property (%d)\n",
	402	ret);
	403	}
	404
	405	if (!fwnode_property_present(fwnode, "function-enumerator"))
	406	return;
	407
	408	ret = fwnode_property_read_u32(fwnode, "function-enumerator",
	409	&props->func_enum);
	410	if (ret) {
	411	dev_err(dev,
	412	"Error parsing 'function-enumerator' property (%d)\n",
	413	ret);
	414	} else {
	415	props->func_enum_present = true;
	416	}
	417	}
	418
	419	int led_compose_name(struct device dev, struct led_init_data init_data,
	420	char *led_classdev_name)
	421	{
	422	struct led_properties props = {};
	423	struct fwnode_handle *fwnode = init_data->fwnode;
	424	const char *devicename = init_data->devicename;
	425
	426	if (!led_classdev_name)
	427	return -EINVAL;
	428
	429	led_parse_fwnode_props(dev, fwnode, &props);
	430
431	if (props.label) {
432	/*
433	* If init_data.devicename is NULL, then it indicates that
434	* DT label should be used as-is for LED class device name.
435	* Otherwise the label is prepended with devicename to compose
436	* the final LED class device name.
437	*/
438	if (!devicename) {
439	strscpy(led_classdev_name, props.label,
440	LED_MAX_NAME_SIZE);
441	} else {
442	snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
443	devicename, props.label);
444	}
445	} else if (props.function \|\| props.color_present) {
446	char tmp_buf[LED_MAX_NAME_SIZE];
447
448	if (props.func_enum_present) {
449	snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s-%d",
450	props.color_present ? led_colors[props.color] : "",
451	props.function ?: "", props.func_enum);
452	} else {
453	snprintf(tmp_buf, LED_MAX_NAME_SIZE, "%s:%s",
454	props.color_present ? led_colors[props.color] : "",
455	props.function ?: "");
456	}
457	if (init_data->devname_mandatory) {
458	snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
459	devicename, tmp_buf);
460	} else {
461	strscpy(led_classdev_name, tmp_buf, LED_MAX_NAME_SIZE);
462
463	}
464	} else if (init_data->default_label) {
465	if (!devicename) {
466	dev_err(dev, "Legacy LED naming requires devicename segment");
467	return -EINVAL;
468	}
469	snprintf(led_classdev_name, LED_MAX_NAME_SIZE, "%s:%s",
470	devicename, init_data->default_label);
471	} else if (is_of_node(fwnode)) {
472	strscpy(led_classdev_name, to_of_node(fwnode)->name,
473	LED_MAX_NAME_SIZE);
474	} else
475	return -EINVAL;
476
477	return 0;
478	}
479	EXPORT_SYMBOL_GPL(led_compose_name);