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fff26f8141
By setting initial values blink_delay_on and blink_delay_off in a led_classdev struct, this change starts the blinking when the led is initialized. With this patch, you can initialize blink_delay_on and blink_delay_off in led_classdev with default_trigger set to "timer", and the led will start up blinking. The current ledtrig-timer implementation ignores any initial blink_delay_on/blink_delay_off settings, and requires setting blink_delay_on/blink_delay_off (typically from userspace) before the led blinks. Signed-off-by: Esben Haabendal <eha@doredevelopment.dk> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
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* LED Kernel Timer Trigger
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*
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* Copyright 2005-2006 Openedhand Ltd.
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*
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* Author: Richard Purdie <rpurdie@openedhand.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/ctype.h>
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#include <linux/leds.h>
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#include "leds.h"
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static ssize_t led_delay_on_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
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}
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static ssize_t led_delay_on_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t size)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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int ret = -EINVAL;
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char *after;
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unsigned long state = simple_strtoul(buf, &after, 10);
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size_t count = after - buf;
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if (isspace(*after))
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count++;
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if (count == size) {
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led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
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ret = count;
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}
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return ret;
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}
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static ssize_t led_delay_off_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
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}
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static ssize_t led_delay_off_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t size)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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int ret = -EINVAL;
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char *after;
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unsigned long state = simple_strtoul(buf, &after, 10);
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size_t count = after - buf;
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if (isspace(*after))
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count++;
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if (count == size) {
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led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
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ret = count;
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}
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return ret;
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}
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static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
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static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
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static void timer_trig_activate(struct led_classdev *led_cdev)
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{
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int rc;
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led_cdev->trigger_data = NULL;
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rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
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if (rc)
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return;
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rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
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if (rc)
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goto err_out_delayon;
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led_blink_set(led_cdev, &led_cdev->blink_delay_on,
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&led_cdev->blink_delay_off);
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led_cdev->trigger_data = (void *)1;
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return;
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err_out_delayon:
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device_remove_file(led_cdev->dev, &dev_attr_delay_on);
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}
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static void timer_trig_deactivate(struct led_classdev *led_cdev)
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{
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if (led_cdev->trigger_data) {
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device_remove_file(led_cdev->dev, &dev_attr_delay_on);
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device_remove_file(led_cdev->dev, &dev_attr_delay_off);
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}
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/* Stop blinking */
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led_brightness_set(led_cdev, LED_OFF);
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}
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static struct led_trigger timer_led_trigger = {
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.name = "timer",
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.activate = timer_trig_activate,
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.deactivate = timer_trig_deactivate,
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};
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static int __init timer_trig_init(void)
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{
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return led_trigger_register(&timer_led_trigger);
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}
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static void __exit timer_trig_exit(void)
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{
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led_trigger_unregister(&timer_led_trigger);
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}
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module_init(timer_trig_init);
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module_exit(timer_trig_exit);
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MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
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MODULE_DESCRIPTION("Timer LED trigger");
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MODULE_LICENSE("GPL");
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