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}

  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 <acpi/video.h>
 11
 12#include "psb_drv.h"
 13#include "psb_intel_reg.h"
 14#include "psb_intel_drv.h"
 15#include "intel_bios.h"
 16#include "power.h"
 17
 
 
 
 
 
 
 
 
 18void gma_backlight_enable(struct drm_device *dev)
 19{
 20	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 21
 22	dev_priv->backlight_enabled = true;
 23	dev_priv->ops->backlight_set(dev, dev_priv->backlight_level);
 
 
 
 
 24}
 25
 26void gma_backlight_disable(struct drm_device *dev)
 27{
 28	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 29
 30	dev_priv->backlight_enabled = false;
 31	dev_priv->ops->backlight_set(dev, 0);
 
 
 
 
 32}
 33
 34void gma_backlight_set(struct drm_device *dev, int v)
 35{
 36	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 37
 38	dev_priv->backlight_level = v;
 39	if (dev_priv->backlight_enabled)
 40		dev_priv->ops->backlight_set(dev, v);
 41}
 42
 43static int gma_backlight_get_brightness(struct backlight_device *bd)
 44{
 45	struct drm_device *dev = bl_get_data(bd);
 46	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 47
 48	if (dev_priv->ops->backlight_get)
 49		return dev_priv->ops->backlight_get(dev);
 50
 51	return dev_priv->backlight_level;
 52}
 53
 54static int gma_backlight_update_status(struct backlight_device *bd)
 55{
 56	struct drm_device *dev = bl_get_data(bd);
 57	int level = backlight_get_brightness(bd);
 58
 59	/* Percentage 1-100% being valid */
 60	if (level < 1)
 61		level = 1;
 62
 63	gma_backlight_set(dev, level);
 64	return 0;
 65}
 66
 67static const struct backlight_ops gma_backlight_ops __maybe_unused = {
 68	.get_brightness = gma_backlight_get_brightness,
 69	.update_status  = gma_backlight_update_status,
 70};
 71
 72int gma_backlight_init(struct drm_device *dev)
 73{
 74	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
 75	struct backlight_properties props __maybe_unused = {};
 76	int ret;
 77
 78	dev_priv->backlight_enabled = true;
 79	dev_priv->backlight_level = 100;
 80
 81	ret = dev_priv->ops->backlight_init(dev);
 82	if (ret)
 83		return ret;
 84
 85	if (!acpi_video_backlight_use_native()) {
 86		drm_info(dev, "Skipping %s backlight registration\n",
 87			 dev_priv->ops->backlight_name);
 88		return 0;
 89	}
 90
 91#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
 92	props.brightness = dev_priv->backlight_level;
 93	props.max_brightness = PSB_MAX_BRIGHTNESS;
 94	props.type = BACKLIGHT_RAW;
 95
 96	dev_priv->backlight_device =
 97		backlight_device_register(dev_priv->ops->backlight_name,
 98					  dev->dev, dev,
 99					  &gma_backlight_ops, &props);
100	if (IS_ERR(dev_priv->backlight_device))
101		return PTR_ERR(dev_priv->backlight_device);
102#endif
103
104	return 0;
105}
106
107void gma_backlight_exit(struct drm_device *dev)
108{
109#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
110	struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
111
112	if (dev_priv->backlight_device)
 
113		backlight_device_unregister(dev_priv->backlight_device);
 
114#endif
115}