GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2016 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ */
+
+#ifndef _BACKLIGHT_H
+#define _BACKLIGHT_H
+
+enum {
+	BACKLIGHT_MAX		= 100,
+	BACKLIGHT_MIN		= 0,
+	BACKLIGHT_OFF		= -1,
+	BACKLIGHT_DEFAULT	= -2,
+};
+
+struct backlight_ops {
+	/**
+	 * enable() - Enable a backlight
+	 *
+	 * @dev:	Backlight device to enable
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*enable)(struct udevice *dev);
+
+	/**
+	 * set_brightness - Set brightness
+	 *
+	 * @dev:	Backlight device to update
+	 * @percent:	Brightness value (0 to 100, or BACKLIGHT_... value)
+	 * @return 0 if OK, -ve on error
+	 */
+	int (*set_brightness)(struct udevice *dev, int percent);
+};
+
+#define backlight_get_ops(dev)	((struct backlight_ops *)(dev)->driver->ops)
+
+/**
+ * backlight_enable() - Enable a backlight
+ *
+ * @dev:	Backlight device to enable
+ * @return 0 if OK, -ve on error
+ */
+int backlight_enable(struct udevice *dev);
+
+/**
+ * backlight_set_brightness - Set brightness
+ *
+ * @dev:	Backlight device to update
+ * @percent:	Brightness value (0 to 100, or BACKLIGHT_... value)
+ * @return 0 if OK, -ve on error
+ */
+int backlight_set_brightness(struct udevice *dev, int percent);
+
+#endif