2b7b6d44e2
The trigger core learned error handling for the activate callback and can handle device attributes now. This allows simplifying the driver considerably. Note that .deactivate() is only called when .activate() succeeded, so the check for .trigger_data being non-NULL can go away. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
105 lines
2.6 KiB
C
105 lines
2.6 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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#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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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 = led_trigger_get_led(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 = led_trigger_get_led(dev);
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unsigned long state;
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ssize_t ret = -EINVAL;
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ret = kstrtoul(buf, 10, &state);
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if (ret)
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return ret;
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led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
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led_cdev->blink_delay_on = state;
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return size;
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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 = led_trigger_get_led(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 = led_trigger_get_led(dev);
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unsigned long state;
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ssize_t ret = -EINVAL;
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ret = kstrtoul(buf, 10, &state);
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if (ret)
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return ret;
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led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
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led_cdev->blink_delay_off = state;
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return size;
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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 struct attribute *timer_trig_attrs[] = {
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&dev_attr_delay_on.attr,
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&dev_attr_delay_off.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(timer_trig);
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static int timer_trig_activate(struct led_classdev *led_cdev)
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{
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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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return 0;
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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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/* Stop blinking */
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led_set_brightness(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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.groups = timer_trig_groups,
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};
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module_led_trigger(timer_led_trigger);
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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 v2");
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