Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 329 insertions, 0 deletions

diff --git a/drivers/leds/led-core.c b/drivers/leds/led-core.c
new file mode 100644
index 000000000..ede4fa0ac
--- /dev/null
+++ b/drivers/leds/led-core.c
@@ -0,0 +1,329 @@
+/*
+ * 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 int __led_set_brightness(struct led_classdev *led_cdev,
+				enum led_brightness value)
+{
+	if (!led_cdev->brightness_set)
+		return -ENOTSUPP;
+
+	led_cdev->brightness_set(led_cdev, value);
+
+	return 0;
+}
+
+static int __led_set_brightness_blocking(struct led_classdev *led_cdev,
+					 enum led_brightness value)
+{
+	if (!led_cdev->brightness_set_blocking)
+		return -ENOTSUPP;
+
+	return led_cdev->brightness_set_blocking(led_cdev, value);
+}
+
+static void led_timer_function(struct timer_list *t)
+{
+	struct led_classdev *led_cdev = from_timer(led_cdev, t, blink_timer);
+	unsigned long brightness;
+	unsigned long delay;
+
+	if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
+		led_set_brightness_nosleep(led_cdev, LED_OFF);
+		clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
+		return;
+	}
+
+	if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP,
+			       &led_cdev->work_flags)) {
+		clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
+		return;
+	}
+
+	brightness = led_get_brightness(led_cdev);
+	if (!brightness) {
+		/* Time to switch the LED on. */
+		if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE,
+					&led_cdev->work_flags))
+			brightness = led_cdev->new_blink_brightness;
+		else
+			brightness = led_cdev->blink_brightness;
+		delay = led_cdev->blink_delay_on;
+	} else {
+		/* Store the current brightness value to be able
+		 * to restore it when the delay_off period is over.
+		 */
+		led_cdev->blink_brightness = brightness;
+		brightness = LED_OFF;
+		delay = led_cdev->blink_delay_off;
+	}
+
+	led_set_brightness_nosleep(led_cdev, brightness);
+
+	/* Return in next iteration if led is in one-shot mode and we are in
+	 * the final blink state so that the led is toggled each delay_on +
+	 * delay_off milliseconds in worst case.
+	 */
+	if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) {
+		if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) {
+			if (brightness)
+				set_bit(LED_BLINK_ONESHOT_STOP,
+					&led_cdev->work_flags);
+		} else {
+			if (!brightness)
+				set_bit(LED_BLINK_ONESHOT_STOP,
+					&led_cdev->work_flags);
+		}
+	}
+
+	mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
+}
+
+static void set_brightness_delayed(struct work_struct *ws)
+{
+	struct led_classdev *led_cdev =
+		container_of(ws, struct led_classdev, set_brightness_work);
+	int ret = 0;
+
+	if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) {
+		led_cdev->delayed_set_value = LED_OFF;
+		led_stop_software_blink(led_cdev);
+	}
+
+	ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value);
+	if (ret == -ENOTSUPP)
+		ret = __led_set_brightness_blocking(led_cdev,
+					led_cdev->delayed_set_value);
+	if (ret < 0 &&
+	    /* LED HW might have been unplugged, therefore don't warn */
+	    !(ret == -ENODEV && (led_cdev->flags & LED_UNREGISTERING) &&
+	    (led_cdev->flags & LED_HW_PLUGGABLE)))
+		dev_err(led_cdev->dev,
+			"Setting an LED's brightness failed (%d)\n", ret);
+}
+
+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_nosleep(led_cdev, LED_OFF);
+		return;
+	}
+
+	/* never off - just set to brightness */
+	if (!delay_off) {
+		led_set_brightness_nosleep(led_cdev,
+					   led_cdev->blink_brightness);
+		return;
+	}
+
+	set_bit(LED_BLINK_SW, &led_cdev->work_flags);
+	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 (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
+	    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_init_core(struct led_classdev *led_cdev)
+{
+	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
+
+	timer_setup(&led_cdev->blink_timer, led_timer_function, 0);
+}
+EXPORT_SYMBOL_GPL(led_init_core);
+
+void led_blink_set(struct led_classdev *led_cdev,
+		   unsigned long *delay_on,
+		   unsigned long *delay_off)
+{
+	del_timer_sync(&led_cdev->blink_timer);
+
+	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
+	clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
+	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
+
+	led_blink_setup(led_cdev, delay_on, delay_off);
+}
+EXPORT_SYMBOL_GPL(led_blink_set);
+
+void led_blink_set_oneshot(struct led_classdev *led_cdev,
+			   unsigned long *delay_on,
+			   unsigned long *delay_off,
+			   int invert)
+{
+	if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
+	     timer_pending(&led_cdev->blink_timer))
+		return;
+
+	set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
+	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
+
+	if (invert)
+		set_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
+	else
+		clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
+
+	led_blink_setup(led_cdev, delay_on, delay_off);
+}
+EXPORT_SYMBOL_GPL(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;
+	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
+}
+EXPORT_SYMBOL_GPL(led_stop_software_blink);
+
+void led_set_brightness(struct led_classdev *led_cdev,
+			enum led_brightness brightness)
+{
+	/*
+	 * If software blink is active, delay brightness setting
+	 * until the next timer tick.
+	 */
+	if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) {
+		/*
+		 * If we need to disable soft blinking delegate this to the
+		 * work queue task to avoid problems in case we are called
+		 * from hard irq context.
+		 */
+		if (brightness == LED_OFF) {
+			set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags);
+			schedule_work(&led_cdev->set_brightness_work);
+		} else {
+			set_bit(LED_BLINK_BRIGHTNESS_CHANGE,
+				&led_cdev->work_flags);
+			led_cdev->new_blink_brightness = brightness;
+		}
+		return;
+	}
+
+	led_set_brightness_nosleep(led_cdev, brightness);
+}
+EXPORT_SYMBOL_GPL(led_set_brightness);
+
+void led_set_brightness_nopm(struct led_classdev *led_cdev,
+			      enum led_brightness value)
+{
+	/* Use brightness_set op if available, it is guaranteed not to sleep */
+	if (!__led_set_brightness(led_cdev, value))
+		return;
+
+	/* If brightness setting can sleep, delegate it to a work queue task */
+	led_cdev->delayed_set_value = value;
+	schedule_work(&led_cdev->set_brightness_work);
+}
+EXPORT_SYMBOL_GPL(led_set_brightness_nopm);
+
+void led_set_brightness_nosleep(struct led_classdev *led_cdev,
+				enum led_brightness value)
+{
+	led_cdev->brightness = min(value, led_cdev->max_brightness);
+
+	if (led_cdev->flags & LED_SUSPENDED)
+		return;
+
+	led_set_brightness_nopm(led_cdev, led_cdev->brightness);
+}
+EXPORT_SYMBOL_GPL(led_set_brightness_nosleep);
+
+int led_set_brightness_sync(struct led_classdev *led_cdev,
+			    enum led_brightness value)
+{
+	if (led_cdev->blink_delay_on || led_cdev->blink_delay_off)
+		return -EBUSY;
+
+	led_cdev->brightness = min(value, led_cdev->max_brightness);
+
+	if (led_cdev->flags & LED_SUSPENDED)
+		return 0;
+
+	return __led_set_brightness_blocking(led_cdev, led_cdev->brightness);
+}
+EXPORT_SYMBOL_GPL(led_set_brightness_sync);
+
+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_GPL(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);