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4d404fd5c5
Break the lines which were more than 80 characters into more lines; replace SPACEs with TABs; correct ident at switch-case; change character encoding from ISO-8859-2 to UTF-8. The order of the functions in led-triggers.c changed in order the similar functions can still be together under titles "Used by LED Class", "LED Trigger Interface" and "Simple LED Tigger Interface" as was grouped before when exported with EXPORT_SYMBOL. Signed-off-by: Márton Németh <nm127@freemail.hu> Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
237 lines
6.2 KiB
C
237 lines
6.2 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/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/sysdev.h>
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#include <linux/timer.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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struct timer_trig_data {
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int brightness_on; /* LED brightness during "on" period.
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* (LED_OFF < brightness_on <= LED_FULL)
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*/
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unsigned long delay_on; /* milliseconds on */
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unsigned long delay_off; /* milliseconds off */
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struct timer_list timer;
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};
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static void led_timer_function(unsigned long data)
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{
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struct led_classdev *led_cdev = (struct led_classdev *) data;
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struct timer_trig_data *timer_data = led_cdev->trigger_data;
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unsigned long brightness;
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unsigned long delay;
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if (!timer_data->delay_on || !timer_data->delay_off) {
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led_set_brightness(led_cdev, LED_OFF);
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return;
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}
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brightness = led_get_brightness(led_cdev);
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if (!brightness) {
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/* Time to switch the LED on. */
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brightness = timer_data->brightness_on;
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delay = timer_data->delay_on;
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} else {
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/* Store the current brightness value to be able
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* to restore it when the delay_off period is over.
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*/
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timer_data->brightness_on = brightness;
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brightness = LED_OFF;
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delay = timer_data->delay_off;
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}
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led_set_brightness(led_cdev, brightness);
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mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay));
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}
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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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struct timer_trig_data *timer_data = led_cdev->trigger_data;
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sprintf(buf, "%lu\n", timer_data->delay_on);
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return strlen(buf) + 1;
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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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struct timer_trig_data *timer_data = led_cdev->trigger_data;
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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 (*after && isspace(*after))
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count++;
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if (count == size) {
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if (timer_data->delay_on != state) {
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/* the new value differs from the previous */
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timer_data->delay_on = state;
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/* deactivate previous settings */
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del_timer_sync(&timer_data->timer);
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/* try to activate hardware acceleration, if any */
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if (!led_cdev->blink_set ||
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led_cdev->blink_set(led_cdev,
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&timer_data->delay_on, &timer_data->delay_off)) {
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/* no hardware acceleration, blink via timer */
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mod_timer(&timer_data->timer, jiffies + 1);
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}
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}
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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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struct timer_trig_data *timer_data = led_cdev->trigger_data;
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sprintf(buf, "%lu\n", timer_data->delay_off);
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return strlen(buf) + 1;
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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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struct timer_trig_data *timer_data = led_cdev->trigger_data;
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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 (*after && isspace(*after))
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count++;
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if (count == size) {
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if (timer_data->delay_off != state) {
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/* the new value differs from the previous */
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timer_data->delay_off = state;
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/* deactivate previous settings */
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del_timer_sync(&timer_data->timer);
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/* try to activate hardware acceleration, if any */
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if (!led_cdev->blink_set ||
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led_cdev->blink_set(led_cdev,
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&timer_data->delay_on, &timer_data->delay_off)) {
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/* no hardware acceleration, blink via timer */
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mod_timer(&timer_data->timer, jiffies + 1);
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}
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}
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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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struct timer_trig_data *timer_data;
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int rc;
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timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL);
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if (!timer_data)
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return;
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timer_data->brightness_on = led_get_brightness(led_cdev);
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if (timer_data->brightness_on == LED_OFF)
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timer_data->brightness_on = LED_FULL;
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led_cdev->trigger_data = timer_data;
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init_timer(&timer_data->timer);
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timer_data->timer.function = led_timer_function;
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timer_data->timer.data = (unsigned long) led_cdev;
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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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goto err_out;
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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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/* If there is hardware support for blinking, start one
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* user friendly blink rate chosen by the driver.
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*/
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if (led_cdev->blink_set)
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led_cdev->blink_set(led_cdev,
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&timer_data->delay_on, &timer_data->delay_off);
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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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err_out:
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led_cdev->trigger_data = NULL;
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kfree(timer_data);
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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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struct timer_trig_data *timer_data = led_cdev->trigger_data;
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if (timer_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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del_timer_sync(&timer_data->timer);
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kfree(timer_data);
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}
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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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