1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * GMA500 Backlight Interface
 4 *
 5 * Copyright (c) 2009-2011, Intel Corporation.
 6 *
 7 * Authors: Eric Knopp
 8 */
 9
10#include "psb_drv.h"
11#include "psb_intel_reg.h"
12#include "psb_intel_drv.h"
13#include "intel_bios.h"
14#include "power.h"
15
16#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
17static void do_gma_backlight_set(struct drm_device *dev)
18{
19	struct drm_psb_private *dev_priv = dev->dev_private;
20	backlight_update_status(dev_priv->backlight_device);
21}
22#endif
23
24void gma_backlight_enable(struct drm_device *dev)
25{
26#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
27	struct drm_psb_private *dev_priv = dev->dev_private;
28	dev_priv->backlight_enabled = true;
29	if (dev_priv->backlight_device) {
30		dev_priv->backlight_device->props.brightness = dev_priv->backlight_level;
31		do_gma_backlight_set(dev);
32	}
33#endif	
34}
35
36void gma_backlight_disable(struct drm_device *dev)
37{
38#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
39	struct drm_psb_private *dev_priv = dev->dev_private;
40	dev_priv->backlight_enabled = false;
41	if (dev_priv->backlight_device) {
42		dev_priv->backlight_device->props.brightness = 0;
43		do_gma_backlight_set(dev);
44	}
45#endif	
46}
47
48void gma_backlight_set(struct drm_device *dev, int v)
49{
50#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
51	struct drm_psb_private *dev_priv = dev->dev_private;
52	dev_priv->backlight_level = v;
53	if (dev_priv->backlight_device && dev_priv->backlight_enabled) {
54		dev_priv->backlight_device->props.brightness = v;
55		do_gma_backlight_set(dev);
56	}
57#endif	
58}
59
60int gma_backlight_init(struct drm_device *dev)
61{
62#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
63	struct drm_psb_private *dev_priv = dev->dev_private;
64	dev_priv->backlight_enabled = true;
65	return dev_priv->ops->backlight_init(dev);
66#else
67	return 0;
68#endif
69}
70
71void gma_backlight_exit(struct drm_device *dev)
72{
73#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
74	struct drm_psb_private *dev_priv = dev->dev_private;
75	if (dev_priv->backlight_device) {
76		dev_priv->backlight_device->props.brightness = 0;
77		backlight_update_status(dev_priv->backlight_device);
78		backlight_device_unregister(dev_priv->backlight_device);
79	}
80#endif
81}