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0f85e8498a
Allow initialization of delays used in timer trigger from Device Tree property. This is especially useful for embedded systems where the trigger might be used early, before bringing up user-space. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
139 lines
3.3 KiB
C
139 lines
3.3 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/slab.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 void pattern_init(struct led_classdev *led_cdev)
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{
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u32 *pattern;
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unsigned int size = 0;
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pattern = led_get_default_pattern(led_cdev, &size);
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if (!pattern)
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return;
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if (size != 2) {
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dev_warn(led_cdev->dev,
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"Expected 2 but got %u values for delays pattern\n",
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size);
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goto out;
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}
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led_cdev->blink_delay_on = pattern[0];
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led_cdev->blink_delay_off = pattern[1];
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/* led_blink_set() called by caller */
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out:
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kfree(pattern);
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}
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static int timer_trig_activate(struct led_classdev *led_cdev)
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{
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if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
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pattern_init(led_cdev);
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/*
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* Mark as initialized even on pattern_init() error because
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* any consecutive call to it would produce the same error.
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*/
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led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
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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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