![Jacek Anaszewski](/assets/img/avatar_default.png)
There are use cases when setting a LED brightness has to have immediate effect (e.g. setting a torch LED brightness). This patch extends LED subsystem to support such operations. The LED subsystem internal API __led_set_brightness is changed to led_set_brightness_async and new led_set_brightness_sync API is added. Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> Acked-by: Kyungmin Park <kyungmin.park@samsung.com> Cc: Richard Purdie <rpurdie@rpsys.net> Signed-off-by: Bryan Wu <cooloney@gmail.com>
205 lines
5.1 KiB
C
205 lines
5.1 KiB
C
/*
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* One-shot LED Trigger
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*
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* Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
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*
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* Based on ledtrig-timer.c by 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/slab.h>
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#include <linux/leds.h>
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#include "../leds.h"
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#define DEFAULT_DELAY 100
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struct oneshot_trig_data {
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unsigned int invert;
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};
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static ssize_t led_shot(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 oneshot_trig_data *oneshot_data = led_cdev->trigger_data;
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led_blink_set_oneshot(led_cdev,
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&led_cdev->blink_delay_on, &led_cdev->blink_delay_off,
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oneshot_data->invert);
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/* content is ignored */
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return size;
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}
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static ssize_t led_invert_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 oneshot_trig_data *oneshot_data = led_cdev->trigger_data;
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return sprintf(buf, "%u\n", oneshot_data->invert);
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}
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static ssize_t led_invert_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 oneshot_trig_data *oneshot_data = led_cdev->trigger_data;
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unsigned long state;
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int ret;
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ret = kstrtoul(buf, 0, &state);
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if (ret)
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return ret;
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oneshot_data->invert = !!state;
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if (oneshot_data->invert)
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led_set_brightness_async(led_cdev, LED_FULL);
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else
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led_set_brightness_async(led_cdev, LED_OFF);
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return size;
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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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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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unsigned long state;
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int ret;
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ret = kstrtoul(buf, 0, &state);
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if (ret)
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return ret;
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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 = 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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unsigned long state;
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int ret;
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ret = kstrtoul(buf, 0, &state);
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if (ret)
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return ret;
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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 DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
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static DEVICE_ATTR(shot, 0200, NULL, led_shot);
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static void oneshot_trig_activate(struct led_classdev *led_cdev)
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{
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struct oneshot_trig_data *oneshot_data;
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int rc;
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oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL);
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if (!oneshot_data)
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return;
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led_cdev->trigger_data = oneshot_data;
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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_trig_data;
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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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rc = device_create_file(led_cdev->dev, &dev_attr_invert);
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if (rc)
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goto err_out_delayoff;
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rc = device_create_file(led_cdev->dev, &dev_attr_shot);
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if (rc)
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goto err_out_invert;
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led_cdev->blink_delay_on = DEFAULT_DELAY;
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led_cdev->blink_delay_off = DEFAULT_DELAY;
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led_cdev->activated = true;
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return;
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err_out_invert:
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device_remove_file(led_cdev->dev, &dev_attr_invert);
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err_out_delayoff:
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device_remove_file(led_cdev->dev, &dev_attr_delay_off);
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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_trig_data:
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kfree(led_cdev->trigger_data);
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}
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static void oneshot_trig_deactivate(struct led_classdev *led_cdev)
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{
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struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data;
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if (led_cdev->activated) {
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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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device_remove_file(led_cdev->dev, &dev_attr_invert);
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device_remove_file(led_cdev->dev, &dev_attr_shot);
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kfree(oneshot_data);
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led_cdev->activated = false;
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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 oneshot_led_trigger = {
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.name = "oneshot",
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.activate = oneshot_trig_activate,
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.deactivate = oneshot_trig_deactivate,
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};
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static int __init oneshot_trig_init(void)
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{
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return led_trigger_register(&oneshot_led_trigger);
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}
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static void __exit oneshot_trig_exit(void)
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{
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led_trigger_unregister(&oneshot_led_trigger);
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}
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module_init(oneshot_trig_init);
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module_exit(oneshot_trig_exit);
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MODULE_AUTHOR("Fabio Baltieri <fabio.baltieri@gmail.com>");
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MODULE_DESCRIPTION("One-shot LED trigger");
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MODULE_LICENSE("GPL");
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