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140 lines
3.3 KiB
140 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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; |
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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; |
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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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/* |
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* If "set brightness to 0" is pending in workqueue, we don't |
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* want that to be reordered after blink_set() |
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*/ |
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flush_work(&led_cdev->set_brightness_work); |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Timer LED trigger"); |
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MODULE_LICENSE("GPL v2");
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