Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / leds / led-core.c

diff --git a/kernel/drivers/leds/led-core.c b/kernel/drivers/leds/led-core.c
new file mode 100644 (file)
index 0000000..9886dac
--- /dev/null
+++ b/kernel/drivers/leds/led-core.c
@@ -0,0 +1,175 @@
+/*
+ * LED Class Core
+ *
+ * Copyright 2005-2006 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/rwsem.h>
+#include "leds.h"
+
+DECLARE_RWSEM(leds_list_lock);
+EXPORT_SYMBOL_GPL(leds_list_lock);
+
+LIST_HEAD(leds_list);
+EXPORT_SYMBOL_GPL(leds_list);
+
+static void led_set_software_blink(struct led_classdev *led_cdev,
+                                  unsigned long delay_on,
+                                  unsigned long delay_off)
+{
+       int current_brightness;
+
+       current_brightness = led_get_brightness(led_cdev);
+       if (current_brightness)
+               led_cdev->blink_brightness = current_brightness;
+       if (!led_cdev->blink_brightness)
+               led_cdev->blink_brightness = led_cdev->max_brightness;
+
+       led_cdev->blink_delay_on = delay_on;
+       led_cdev->blink_delay_off = delay_off;
+
+       /* never on - just set to off */
+       if (!delay_on) {
+               led_set_brightness_async(led_cdev, LED_OFF);
+               return;
+       }
+
+       /* never off - just set to brightness */
+       if (!delay_off) {
+               led_set_brightness_async(led_cdev, led_cdev->blink_brightness);
+               return;
+       }
+
+       mod_timer(&led_cdev->blink_timer, jiffies + 1);
+}
+
+
+static void led_blink_setup(struct led_classdev *led_cdev,
+                    unsigned long *delay_on,
+                    unsigned long *delay_off)
+{
+       if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
+           led_cdev->blink_set &&
+           !led_cdev->blink_set(led_cdev, delay_on, delay_off))
+               return;
+
+       /* blink with 1 Hz as default if nothing specified */
+       if (!*delay_on && !*delay_off)
+               *delay_on = *delay_off = 500;
+
+       led_set_software_blink(led_cdev, *delay_on, *delay_off);
+}
+
+void led_blink_set(struct led_classdev *led_cdev,
+                  unsigned long *delay_on,
+                  unsigned long *delay_off)
+{
+       del_timer_sync(&led_cdev->blink_timer);
+
+       led_cdev->flags &= ~LED_BLINK_ONESHOT;
+       led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
+
+       led_blink_setup(led_cdev, delay_on, delay_off);
+}
+EXPORT_SYMBOL(led_blink_set);
+
+void led_blink_set_oneshot(struct led_classdev *led_cdev,
+                          unsigned long *delay_on,
+                          unsigned long *delay_off,
+                          int invert)
+{
+       if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
+            timer_pending(&led_cdev->blink_timer))
+               return;
+
+       led_cdev->flags |= LED_BLINK_ONESHOT;
+       led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
+
+       if (invert)
+               led_cdev->flags |= LED_BLINK_INVERT;
+       else
+               led_cdev->flags &= ~LED_BLINK_INVERT;
+
+       led_blink_setup(led_cdev, delay_on, delay_off);
+}
+EXPORT_SYMBOL(led_blink_set_oneshot);
+
+void led_stop_software_blink(struct led_classdev *led_cdev)
+{
+       del_timer_sync(&led_cdev->blink_timer);
+       led_cdev->blink_delay_on = 0;
+       led_cdev->blink_delay_off = 0;
+}
+EXPORT_SYMBOL_GPL(led_stop_software_blink);
+
+void led_set_brightness(struct led_classdev *led_cdev,
+                       enum led_brightness brightness)
+{
+       int ret = 0;
+
+       /* delay brightness setting if need to stop soft-blink timer */
+       if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
+               led_cdev->delayed_set_value = brightness;
+               schedule_work(&led_cdev->set_brightness_work);
+               return;
+       }
+
+       if (led_cdev->flags & SET_BRIGHTNESS_ASYNC) {
+               led_set_brightness_async(led_cdev, brightness);
+               return;
+       } else if (led_cdev->flags & SET_BRIGHTNESS_SYNC)
+               ret = led_set_brightness_sync(led_cdev, brightness);
+       else
+               ret = -EINVAL;
+
+       if (ret < 0)
+               dev_dbg(led_cdev->dev, "Setting LED brightness failed (%d)\n",
+                       ret);
+}
+EXPORT_SYMBOL(led_set_brightness);
+
+int led_update_brightness(struct led_classdev *led_cdev)
+{
+       int ret = 0;
+
+       if (led_cdev->brightness_get) {
+               ret = led_cdev->brightness_get(led_cdev);
+               if (ret >= 0) {
+                       led_cdev->brightness = ret;
+                       return 0;
+               }
+       }
+
+       return ret;
+}
+EXPORT_SYMBOL(led_update_brightness);
+
+/* Caller must ensure led_cdev->led_access held */
+void led_sysfs_disable(struct led_classdev *led_cdev)
+{
+       lockdep_assert_held(&led_cdev->led_access);
+
+       led_cdev->flags |= LED_SYSFS_DISABLE;
+}
+EXPORT_SYMBOL_GPL(led_sysfs_disable);
+
+/* Caller must ensure led_cdev->led_access held */
+void led_sysfs_enable(struct led_classdev *led_cdev)
+{
+       lockdep_assert_held(&led_cdev->led_access);
+
+       led_cdev->flags &= ~LED_SYSFS_DISABLE;
+}
+EXPORT_SYMBOL_GPL(led_sysfs_enable);