1/*
2 * GMA500 Backlight Interface
3 *
4 * Copyright (c) 2009-2011, Intel Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License along with
16 * this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Authors: Eric Knopp
20 *
21 */
22
23#include "psb_drv.h"
24#include "psb_intel_reg.h"
25#include "psb_intel_drv.h"
26#include "intel_bios.h"
27#include "power.h"
28
29#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
30static void do_gma_backlight_set(struct drm_device *dev)
31{
32	struct drm_psb_private *dev_priv = dev->dev_private;
33	backlight_update_status(dev_priv->backlight_device);
34}
35#endif
36
37void gma_backlight_enable(struct drm_device *dev)
38{
39#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
40	struct drm_psb_private *dev_priv = dev->dev_private;
41	dev_priv->backlight_enabled = true;
42	if (dev_priv->backlight_device) {
43		dev_priv->backlight_device->props.brightness = dev_priv->backlight_level;
44		do_gma_backlight_set(dev);
45	}
46#endif
47}
48
49void gma_backlight_disable(struct drm_device *dev)
50{
51#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
52	struct drm_psb_private *dev_priv = dev->dev_private;
53	dev_priv->backlight_enabled = false;
54	if (dev_priv->backlight_device) {
55		dev_priv->backlight_device->props.brightness = 0;
56		do_gma_backlight_set(dev);
57	}
58#endif
59}
60
61void gma_backlight_set(struct drm_device *dev, int v)
62{
63#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
64	struct drm_psb_private *dev_priv = dev->dev_private;
65	dev_priv->backlight_level = v;
66	if (dev_priv->backlight_device && dev_priv->backlight_enabled) {
67		dev_priv->backlight_device->props.brightness = v;
68		do_gma_backlight_set(dev);
69	}
70#endif
71}
72
73int gma_backlight_init(struct drm_device *dev)
74{
75#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
76	struct drm_psb_private *dev_priv = dev->dev_private;
77	dev_priv->backlight_enabled = true;
78	return dev_priv->ops->backlight_init(dev);
79#else
80	return 0;
81#endif
82}
83
84void gma_backlight_exit(struct drm_device *dev)
85{
86#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
87	struct drm_psb_private *dev_priv = dev->dev_private;
88	if (dev_priv->backlight_device) {
89		dev_priv->backlight_device->props.brightness = 0;
90		backlight_update_status(dev_priv->backlight_device);
91		backlight_device_unregister(dev_priv->backlight_device);
92	}
93#endif
94}
95