cregit-Linux how code gets into the kernel

Release 4.7 drivers/leds/led-triggers.c

Directory: drivers/leds
/*
 * LED Triggers Core
 *
 * Copyright 2005-2007 Openedhand Ltd.
 *
 * Author: Richard Purdie <rpurdie@openedhand.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/timer.h>
#include <linux/rwsem.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include "leds.h"

/*
 * Nests outside led_cdev->trigger_lock
 */
static DECLARE_RWSEM(triggers_list_lock);

LIST_HEAD(trigger_list);

 /* Used by LED Class */




ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct led_trigger *trig;
	int ret = count;

	mutex_lock(&led_cdev->led_access);

	if (led_sysfs_is_disabled(led_cdev)) {
		ret = -EBUSY;
		goto unlock;
	}

	if (sysfs_streq(buf, "none")) {
		led_trigger_remove(led_cdev);
		goto unlock;
	}

	down_read(&triggers_list_lock);
	list_for_each_entry(trig, &trigger_list, next_trig) {
		if (sysfs_streq(buf, trig->name)) {
			down_write(&led_cdev->trigger_lock);
			led_trigger_set(led_cdev, trig);
			up_write(&led_cdev->trigger_lock);

			up_read(&triggers_list_lock);
			goto unlock;
		}
	}
	up_read(&triggers_list_lock);

unlock:
	mutex_unlock(&led_cdev->led_access);
	return ret;
}

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richard purdierichard purdie11568.86%350.00%


jacek anaszewskijacek anaszewski4728.14%116.67%


heiner kallweitheiner kallweit42.40%116.67%


marton nemethmarton nemeth10.60%116.67%


Total167100.00%6100.00%




EXPORT_SYMBOL_GPL(led_trigger_store);




ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct led_trigger *trig;
	int len = 0;

	down_read(&triggers_list_lock);
	down_read(&led_cdev->trigger_lock);

	if (!led_cdev->trigger)
		len += sprintf(buf+len, "[none] ");
	else
		len += sprintf(buf+len, "none ");

	list_for_each_entry(trig, &trigger_list, next_trig) {
		if (led_cdev->trigger && !strcmp(led_cdev->trigger->name,
							trig->name))
			len += sprintf(buf+len, "[%s] ", trig->name);
		else
			len += sprintf(buf+len, "%s ", trig->name);
	}
	up_read(&led_cdev->trigger_lock);
	up_read(&triggers_list_lock);

	len += sprintf(len+buf, "\n");
	return len;
}

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richard purdierichard purdie172100.00%3100.00%


Total172100.00%3100.00%




EXPORT_SYMBOL_GPL(led_trigger_show);

/* Caller must ensure led_cdev->trigger_lock held */



void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
{
	unsigned long flags;
	char *event = NULL;
	char *envp[2];
	const char *name;

	name = trig ? trig->name : "none";
	event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);

	/* Remove any existing trigger */
	if (led_cdev->trigger) {
		write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
		list_del(&led_cdev->trig_list);
		write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock,
			flags);
		cancel_work_sync(&led_cdev->set_brightness_work);
		led_stop_software_blink(led_cdev);
		if (led_cdev->trigger->deactivate)
			led_cdev->trigger->deactivate(led_cdev);
		led_cdev->trigger = NULL;
		led_set_brightness(led_cdev, LED_OFF);
	}
	if (trig) {
		write_lock_irqsave(&trig->leddev_list_lock, flags);
		list_add_tail(&led_cdev->trig_list, &trig->led_cdevs);
		write_unlock_irqrestore(&trig->leddev_list_lock, flags);
		led_cdev->trigger = trig;
		if (trig->activate)
			trig->activate(led_cdev);
	}

	if (event) {
		envp[0] = event;
		envp[1] = NULL;
		kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp);
		kfree(event);
	}
}

Contributors
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richard purdierichard purdie12251.05%114.29%


colin crosscolin cross7832.64%114.29%


fabio baltierifabio baltieri135.44%114.29%


dmitry eremin-baryshkovdmitry eremin-baryshkov114.60%114.29%


bryan wubryan wu83.35%114.29%


paul collinspaul collins62.51%114.29%


shuah khanshuah khan10.42%114.29%


Total239100.00%7100.00%




EXPORT_SYMBOL_GPL(led_trigger_set);




void led_trigger_remove(struct led_classdev *led_cdev)
{
	down_write(&led_cdev->trigger_lock);
	led_trigger_set(led_cdev, NULL);
	up_write(&led_cdev->trigger_lock);
}

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marton nemethmarton nemeth33100.00%1100.00%


Total33100.00%1100.00%




EXPORT_SYMBOL_GPL(led_trigger_remove);




void led_trigger_set_default(struct led_classdev *led_cdev)
{
	struct led_trigger *trig;

	if (!led_cdev->default_trigger)
		return;

	down_read(&triggers_list_lock);
	down_write(&led_cdev->trigger_lock);
	list_for_each_entry(trig, &trigger_list, next_trig) {
		if (!strcmp(led_cdev->default_trigger, trig->name))
			led_trigger_set(led_cdev, trig);
	}
	up_write(&led_cdev->trigger_lock);
	up_read(&triggers_list_lock);
}

Contributors
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richard purdierichard purdie82100.00%2100.00%


Total82100.00%2100.00%




EXPORT_SYMBOL_GPL(led_trigger_set_default);




void led_trigger_rename_static(const char *name, struct led_trigger *trig)
{
	/* new name must be on a temporary string to prevent races */
	BUG_ON(name == trig->name);

	down_write(&triggers_list_lock);
	/* this assumes that trig->name was originaly allocated to
         * non constant storage */
	strcpy((char *)trig->name, name);
	up_write(&triggers_list_lock);
}

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Total51100.00%1100.00%




EXPORT_SYMBOL_GPL(led_trigger_rename_static);

/* LED Trigger Interface */




int led_trigger_register(struct led_trigger *trig)
{
	struct led_classdev *led_cdev;
	struct led_trigger *_trig;

	rwlock_init(&trig->leddev_list_lock);
	INIT_LIST_HEAD(&trig->led_cdevs);

	down_write(&triggers_list_lock);
	/* Make sure the trigger's name isn't already in use */
	list_for_each_entry(_trig, &trigger_list, next_trig) {
		if (!strcmp(_trig->name, trig->name)) {
			up_write(&triggers_list_lock);
			return -EEXIST;
		}
	}
	/* Add to the list of led triggers */
	list_add_tail(&trig->next_trig, &trigger_list);
	up_write(&triggers_list_lock);

	/* Register with any LEDs that have this as a default trigger */
	down_read(&leds_list_lock);
	list_for_each_entry(led_cdev, &leds_list, node) {
		down_write(&led_cdev->trigger_lock);
		if (!led_cdev->trigger && led_cdev->default_trigger &&
			    !strcmp(led_cdev->default_trigger, trig->name))
			led_trigger_set(led_cdev, trig);
		up_write(&led_cdev->trigger_lock);
	}
	up_read(&leds_list_lock);

	return 0;
}

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richard purdierichard purdie12071.01%360.00%


adam nielsenadam nielsen3923.08%120.00%


bryan wubryan wu105.92%120.00%


Total169100.00%5100.00%




EXPORT_SYMBOL_GPL(led_trigger_register);




void led_trigger_unregister(struct led_trigger *trig)
{
	struct led_classdev *led_cdev;

	if (list_empty_careful(&trig->next_trig))
		return;

	/* Remove from the list of led triggers */
	down_write(&triggers_list_lock);
	list_del_init(&trig->next_trig);
	up_write(&triggers_list_lock);

	/* Remove anyone actively using this trigger */
	down_read(&leds_list_lock);
	list_for_each_entry(led_cdev, &leds_list, node) {
		down_write(&led_cdev->trigger_lock);
		if (led_cdev->trigger == trig)
			led_trigger_set(led_cdev, NULL);
		up_write(&led_cdev->trigger_lock);
	}
	up_read(&leds_list_lock);
}

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richard purdierichard purdie8685.15%360.00%


sasha levinsasha levin1211.88%120.00%


bryan wubryan wu32.97%120.00%


Total101100.00%5100.00%




EXPORT_SYMBOL_GPL(led_trigger_unregister);




static void devm_led_trigger_release(struct device *dev, void *res)
{
	led_trigger_unregister(*(struct led_trigger **)res);
}


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heiner kallweitheiner kallweit27100.00%1100.00%


Total27100.00%1100.00%






int devm_led_trigger_register(struct device *dev,
			      struct led_trigger *trig)
{
	struct led_trigger **dr;
	int rc;

	dr = devres_alloc(devm_led_trigger_release, sizeof(*dr),
			  GFP_KERNEL);
	if (!dr)
		return -ENOMEM;

	*dr = trig;

	rc = led_trigger_register(trig);
	if (rc)
		devres_free(dr);
	else
		devres_add(dev, dr);

	return rc;
}

Contributors
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heiner kallweitheiner kallweit80100.00%1100.00%


Total80100.00%1100.00%




EXPORT_SYMBOL_GPL(devm_led_trigger_register);

/* Simple LED Tigger Interface */




void led_trigger_event(struct led_trigger *trig,
			enum led_brightness brightness)
{
	struct led_classdev *led_cdev;

	if (!trig)
		return;

	read_lock(&trig->leddev_list_lock);
	list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list)
		led_set_brightness(led_cdev, brightness);
	read_unlock(&trig->leddev_list_lock);
}

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marton nemethmarton nemeth2748.21%228.57%


richard purdierichard purdie1832.14%228.57%


zhao gangzhao gang58.93%114.29%


bryan wubryan wu58.93%114.29%


fabio baltierifabio baltieri11.79%114.29%


Total56100.00%7100.00%




EXPORT_SYMBOL_GPL(led_trigger_event);




static void led_trigger_blink_setup(struct led_trigger *trig,
			     unsigned long *delay_on,
			     unsigned long *delay_off,
			     int oneshot,
			     int invert)
{
	struct led_classdev *led_cdev;

	if (!trig)
		return;

	read_lock(&trig->leddev_list_lock);
	list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) {
		if (oneshot)
			led_blink_set_oneshot(led_cdev, delay_on, delay_off,
					      invert);
		else
			led_blink_set(led_cdev, delay_on, delay_off);
	}
	read_unlock(&trig->leddev_list_lock);
}


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fabio baltierifabio baltieri2325.84%120.00%


bryan wubryan wu66.74%240.00%


zhao gangzhao gang66.74%120.00%


Total89100.00%5100.00%






void led_trigger_blink(struct led_trigger *trig,
		       unsigned long *delay_on,
		       unsigned long *delay_off)
{
	led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0);
}

Contributors
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fabio baltierifabio baltieri33100.00%1100.00%


Total33100.00%1100.00%




EXPORT_SYMBOL_GPL(led_trigger_blink);




void led_trigger_blink_oneshot(struct led_trigger *trig,
			       unsigned long *delay_on,
			       unsigned long *delay_off,
			       int invert)
{
	led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert);
}

Contributors
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Total36100.00%1100.00%




EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot);




void led_trigger_register_simple(const char *name, struct led_trigger **tp)
{
	struct led_trigger *trig;
	int err;

	trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);

	if (trig) {
		trig->name = name;
		err = led_trigger_register(trig);
		if (err < 0) {
			kfree(trig);
			trig = NULL;
			pr_warn("LED trigger %s failed to register (%d)\n",
				name, err);
		}
	} else {
		pr_warn("LED trigger %s failed to register (no memory)\n",
			name);
	}
	*tp = trig;
}

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marton nemethmarton nemeth6263.92%120.00%


richard purdierichard purdie1212.37%120.00%


masakazu mokunomasakazu mokuno99.28%120.00%


bryan wubryan wu88.25%120.00%


sachin kamatsachin kamat66.19%120.00%


Total97100.00%5100.00%




EXPORT_SYMBOL_GPL(led_trigger_register_simple);




void led_trigger_unregister_simple(struct led_trigger *trig)
{
	if (trig)
		led_trigger_unregister(trig);
	kfree(trig);
}

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marton nemethmarton nemeth1770.83%133.33%


bryan wubryan wu416.67%133.33%


richard purdierichard purdie312.50%133.33%


Total24100.00%3100.00%




EXPORT_SYMBOL_GPL(led_trigger_unregister_simple);

MODULE_AUTHOR("Richard Purdie");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("LED Triggers Core");

Overall Contributors
PersonTokensPropCommitsCommitProp
richard purdierichard purdie80350.57%518.52%


marton nemethmarton nemeth17310.89%27.41%


fabio baltierifabio baltieri16710.52%311.11%


heiner kallweitheiner kallweit1167.30%27.41%


colin crosscolin cross784.91%13.70%


vasily khoruzhickvasily khoruzhick593.72%13.70%


jacek anaszewskijacek anaszewski472.96%13.70%


bryan wubryan wu442.77%27.41%


adam nielsenadam nielsen392.46%13.70%


sasha levinsasha levin120.76%13.70%


dmitry eremin-baryshkovdmitry eremin-baryshkov110.69%13.70%


zhao gangzhao gang110.69%13.70%


masakazu mokunomasakazu mokuno90.57%13.70%


paul collinspaul collins60.38%13.70%


sachin kamatsachin kamat60.38%13.70%


tejun heotejun heo30.19%13.70%


ingo molnaringo molnar30.19%13.70%


shuah khanshuah khan10.06%13.70%


ezequiel garciaezequiel garcia0.00%00.00%


Total1588100.00%27100.00%

  
Directory: drivers/leds



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