Index: linux-2.6.15-rc2/drivers/leds/led-triggers.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.15-rc2/drivers/leds/led-triggers.c 2005-11-28 16:10:29.000000000 +0000 @@ -0,0 +1,240 @@ +/* + * LED Triggers Core + * + * Copyright 2005 Openedhand Ltd. + * + * Author: Richard Purdie + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "leds.h" + +static rwlock_t triggers_list_lock = RW_LOCK_UNLOCKED; +static LIST_HEAD(trigger_list); + +ssize_t led_trigger_store(struct class_device *dev, const char *buf, size_t count) +{ + struct led_device *led_dev = dev->class_data; + char trigger_name[TRIG_NAME_MAX]; + struct led_trigger *trig; + size_t len; + + trigger_name[sizeof(trigger_name) - 1] = '\0'; + strncpy(trigger_name, buf, sizeof(trigger_name) - 1); + len = strlen(trigger_name); + + if (len && trigger_name[len - 1] == '\n') + trigger_name[len - 1] = '\0'; + + if (!strcmp(trigger_name, "none")) { + write_lock(&led_dev->lock); + led_trigger_set(led_dev, NULL); + write_unlock(&led_dev->lock); + return count; + } + + read_lock(&triggers_list_lock); + list_for_each_entry(trig, &trigger_list, next_trig) { + if (!strcmp(trigger_name, trig->name)) { + write_lock(&led_dev->lock); + led_trigger_set(led_dev, trig); + write_unlock(&led_dev->lock); + + read_unlock(&triggers_list_lock); + return count; + } + } + read_unlock(&triggers_list_lock); + + return -EINVAL; +} + + +ssize_t led_trigger_show(struct class_device *dev, char *buf) +{ + struct led_device *led_dev = dev->class_data; + struct led_trigger *trig; + int len = 0; + + read_lock(&led_dev->lock); + + if (!led_dev->trigger) + len += sprintf(buf+len, "[none] "); + else + len += sprintf(buf+len, "none "); + + read_lock(&triggers_list_lock); + list_for_each_entry(trig, &trigger_list, next_trig) { + if (led_dev->trigger && !strcmp(led_dev->trigger->name, trig->name)) + len += sprintf(buf+len, "[%s] ", trig->name); + else + len += sprintf(buf+len, "%s ", trig->name); + } + read_unlock(&triggers_list_lock); + read_unlock(&led_dev->lock); + + len += sprintf(len+buf, "\n"); + return len; +} + +void led_trigger_event(struct led_trigger *trigger, int event) +{ + struct list_head *entry; + + if (!trigger) + return; + + read_lock(&trigger->led_devs); + list_for_each(entry, &trigger->led_devs) { + struct led_device *led_dev; + + led_dev = list_entry(entry, struct led_device, trig_list); + read_lock(&led_dev->lock); + if (event) + led_dev->brightness_set(led_dev, 100); + else + led_dev->brightness_set(led_dev, 0); + + read_unlock(&led_dev->lock); + } + read_unlock(&trigger->led_devs); +} + +/* Caller must ensure led_dev->lock held for write */ +void led_trigger_set(struct led_device *led_dev, struct led_trigger *trigger) +{ + /* Remove any existing trigger */ + if (led_dev->trigger) { + write_lock(&led_dev->trigger->leddev_list_lock); + list_del(&led_dev->trig_list); + write_unlock(&led_dev->trigger->leddev_list_lock); + if (led_dev->trigger->deactivate) + led_dev->trigger->deactivate(led_dev); + + } + if (trigger) { + write_lock(&trigger->leddev_list_lock); + list_add_tail(&led_dev->trig_list, &trigger->led_devs); + write_unlock(&trigger->leddev_list_lock); + if (trigger->activate) + trigger->activate(led_dev); + } + led_dev->trigger = trigger; +} + +void led_trigger_set_default(struct led_device *led_dev) +{ + struct led_trigger *trig; + + if (!led_dev->default_trigger) + return; + + write_lock(&led_dev->lock); + read_lock(&triggers_list_lock); + list_for_each_entry(trig, &trigger_list, next_trig) { + if (!strcmp(led_dev->default_trigger, trig->name)) + led_trigger_set(led_dev, trig); + } + read_unlock(&triggers_list_lock); + write_unlock(&led_dev->lock); +} + +int led_trigger_register(struct led_trigger *trigger) +{ + struct led_device *led_dev; + + rwlock_init(&trigger->leddev_list_lock); + INIT_LIST_HEAD(&trigger->led_devs); + + /* Add to the list of led triggers */ + write_lock(&triggers_list_lock); + list_add_tail(&trigger->next_trig, &trigger_list); + write_unlock(&triggers_list_lock); + + /* Register with any LEDs that have this as a default trigger */ + read_lock(&leds_list); + list_for_each_entry(led_dev, &leds_list, node) { + write_lock(&led_dev->lock); + if (!led_dev->trigger && led_dev->default_trigger && + !strcmp(led_dev->default_trigger, trigger->name)) + led_trigger_set(led_dev, trigger); + write_unlock(&led_dev->lock); + } + read_unlock(&leds_list); + + return 0; +} + +void led_trigger_register_simple(char *name, struct led_trigger **tp) +{ + struct led_trigger *trigger; + + trigger = kzalloc(sizeof(struct led_trigger), GFP_KERNEL); + + if (trigger) { + trigger->name = name; + led_trigger_register(trigger); + } + *tp = trigger; +} + + +void led_trigger_unregister(struct led_trigger *trigger) +{ + struct led_device *led_dev; + + /* Remove from the list of led triggers */ + write_lock(&triggers_list_lock); + list_del(&trigger->next_trig); + write_unlock(&triggers_list_lock); + + /* Remove anyone actively using this trigger */ + read_lock(&leds_list); + list_for_each_entry(led_dev, &leds_list, node) { + write_lock(&led_dev->lock); + if (led_dev->trigger == trigger) + led_trigger_set(led_dev, NULL); + write_unlock(&led_dev->lock); + } + read_unlock(&leds_list); +} + +void led_trigger_unregister_simple(struct led_trigger *trigger) +{ + led_trigger_unregister(trigger); + kfree(trigger); +} + +/* Used by LED Class */ +EXPORT_SYMBOL_GPL(led_trigger_set); +EXPORT_SYMBOL_GPL(led_trigger_set_default); +EXPORT_SYMBOL_GPL(led_trigger_show); +EXPORT_SYMBOL_GPL(led_trigger_store); + +/* LED Trigger Interface */ +EXPORT_SYMBOL_GPL(led_trigger_register); +EXPORT_SYMBOL_GPL(led_trigger_unregister); + +/* Simple LED Tigger Interface */ +EXPORT_SYMBOL_GPL(led_trigger_register_simple); +EXPORT_SYMBOL_GPL(led_trigger_unregister_simple); +EXPORT_SYMBOL_GPL(led_trigger_event); + +MODULE_AUTHOR("Richard Purdie"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("LED Triggers Core"); +