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path: root/drivers/leds/ledtrig-transient.c
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Diffstat (limited to 'drivers/leds/ledtrig-transient.c')
-rw-r--r--drivers/leds/ledtrig-transient.c237
1 files changed, 0 insertions, 237 deletions
diff --git a/drivers/leds/ledtrig-transient.c b/drivers/leds/ledtrig-transient.c
deleted file mode 100644
index 398f1042c43e..000000000000
--- a/drivers/leds/ledtrig-transient.c
+++ /dev/null
@@ -1,237 +0,0 @@
-/*
- * LED Kernel Transient Trigger
- *
- * Copyright (C) 2012 Shuah Khan <shuahkhan@gmail.com>
- *
- * Based on Richard Purdie's ledtrig-timer.c and Atsushi Nemoto's
- * ledtrig-heartbeat.c
- * Design and use-case input from Jonas Bonn <jonas@southpole.se> and
- * Neil Brown <neilb@suse.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-/*
- * Transient trigger allows one shot timer activation. Please refer to
- * Documentation/leds/ledtrig-transient.txt for details
-*/
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/device.h>
-#include <linux/slab.h>
-#include <linux/timer.h>
-#include <linux/leds.h>
-#include "leds.h"
-
-struct transient_trig_data {
- int activate;
- int state;
- int restore_state;
- unsigned long duration;
- struct timer_list timer;
-};
-
-static void transient_timer_function(unsigned long data)
-{
- struct led_classdev *led_cdev = (struct led_classdev *) data;
- struct transient_trig_data *transient_data = led_cdev->trigger_data;
-
- transient_data->activate = 0;
- __led_set_brightness(led_cdev, transient_data->restore_state);
-}
-
-static ssize_t transient_activate_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct led_classdev *led_cdev = dev_get_drvdata(dev);
- struct transient_trig_data *transient_data = led_cdev->trigger_data;
-
- return sprintf(buf, "%d\n", transient_data->activate);
-}
-
-static ssize_t transient_activate_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t size)
-{
- struct led_classdev *led_cdev = dev_get_drvdata(dev);
- struct transient_trig_data *transient_data = led_cdev->trigger_data;
- unsigned long state;
- ssize_t ret;
-
- ret = kstrtoul(buf, 10, &state);
- if (ret)
- return ret;
-
- if (state != 1 && state != 0)
- return -EINVAL;
-
- /* cancel the running timer */
- if (state == 0 && transient_data->activate == 1) {
- del_timer(&transient_data->timer);
- transient_data->activate = state;
- __led_set_brightness(led_cdev, transient_data->restore_state);
- return size;
- }
-
- /* start timer if there is no active timer */
- if (state == 1 && transient_data->activate == 0 &&
- transient_data->duration != 0) {
- transient_data->activate = state;
- __led_set_brightness(led_cdev, transient_data->state);
- transient_data->restore_state =
- (transient_data->state == LED_FULL) ? LED_OFF : LED_FULL;
- mod_timer(&transient_data->timer,
- jiffies + transient_data->duration);
- }
-
- /* state == 0 && transient_data->activate == 0
- timer is not active - just return */
- /* state == 1 && transient_data->activate == 1
- timer is already active - just return */
-
- return size;
-}
-
-static ssize_t transient_duration_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct led_classdev *led_cdev = dev_get_drvdata(dev);
- struct transient_trig_data *transient_data = led_cdev->trigger_data;
-
- return sprintf(buf, "%lu\n", transient_data->duration);
-}
-
-static ssize_t transient_duration_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t size)
-{
- struct led_classdev *led_cdev = dev_get_drvdata(dev);
- struct transient_trig_data *transient_data = led_cdev->trigger_data;
- unsigned long state;
- ssize_t ret;
-
- ret = kstrtoul(buf, 10, &state);
- if (ret)
- return ret;
-
- transient_data->duration = state;
- return size;
-}
-
-static ssize_t transient_state_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct led_classdev *led_cdev = dev_get_drvdata(dev);
- struct transient_trig_data *transient_data = led_cdev->trigger_data;
- int state;
-
- state = (transient_data->state == LED_FULL) ? 1 : 0;
- return sprintf(buf, "%d\n", state);
-}
-
-static ssize_t transient_state_store(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t size)
-{
- struct led_classdev *led_cdev = dev_get_drvdata(dev);
- struct transient_trig_data *transient_data = led_cdev->trigger_data;
- unsigned long state;
- ssize_t ret;
-
- ret = kstrtoul(buf, 10, &state);
- if (ret)
- return ret;
-
- if (state != 1 && state != 0)
- return -EINVAL;
-
- transient_data->state = (state == 1) ? LED_FULL : LED_OFF;
- return size;
-}
-
-static DEVICE_ATTR(activate, 0644, transient_activate_show,
- transient_activate_store);
-static DEVICE_ATTR(duration, 0644, transient_duration_show,
- transient_duration_store);
-static DEVICE_ATTR(state, 0644, transient_state_show, transient_state_store);
-
-static void transient_trig_activate(struct led_classdev *led_cdev)
-{
- int rc;
- struct transient_trig_data *tdata;
-
- tdata = kzalloc(sizeof(struct transient_trig_data), GFP_KERNEL);
- if (!tdata) {
- dev_err(led_cdev->dev,
- "unable to allocate transient trigger\n");
- return;
- }
- led_cdev->trigger_data = tdata;
-
- rc = device_create_file(led_cdev->dev, &dev_attr_activate);
- if (rc)
- goto err_out;
-
- rc = device_create_file(led_cdev->dev, &dev_attr_duration);
- if (rc)
- goto err_out_duration;
-
- rc = device_create_file(led_cdev->dev, &dev_attr_state);
- if (rc)
- goto err_out_state;
-
- setup_timer(&tdata->timer, transient_timer_function,
- (unsigned long) led_cdev);
- led_cdev->activated = true;
-
- return;
-
-err_out_state:
- device_remove_file(led_cdev->dev, &dev_attr_duration);
-err_out_duration:
- device_remove_file(led_cdev->dev, &dev_attr_activate);
-err_out:
- dev_err(led_cdev->dev, "unable to register transient trigger\n");
- led_cdev->trigger_data = NULL;
- kfree(tdata);
-}
-
-static void transient_trig_deactivate(struct led_classdev *led_cdev)
-{
- struct transient_trig_data *transient_data = led_cdev->trigger_data;
-
- if (led_cdev->activated) {
- del_timer_sync(&transient_data->timer);
- __led_set_brightness(led_cdev, transient_data->restore_state);
- device_remove_file(led_cdev->dev, &dev_attr_activate);
- device_remove_file(led_cdev->dev, &dev_attr_duration);
- device_remove_file(led_cdev->dev, &dev_attr_state);
- led_cdev->trigger_data = NULL;
- led_cdev->activated = false;
- kfree(transient_data);
- }
-}
-
-static struct led_trigger transient_trigger = {
- .name = "transient",
- .activate = transient_trig_activate,
- .deactivate = transient_trig_deactivate,
-};
-
-static int __init transient_trig_init(void)
-{
- return led_trigger_register(&transient_trigger);
-}
-
-static void __exit transient_trig_exit(void)
-{
- led_trigger_unregister(&transient_trigger);
-}
-
-module_init(transient_trig_init);
-module_exit(transient_trig_exit);
-
-MODULE_AUTHOR("Shuah Khan <shuahkhan@gmail.com>");
-MODULE_DESCRIPTION("Transient LED trigger");
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2025-12-13 01:27:53 +0000