Add the rt linux 4.1.3-rt3 as base
[kvmfornfv.git] / kernel / drivers / gpu / drm / gma500 / backlight.c
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
30 static 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
37 void 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
49 void 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
61 void 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
73 int 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
84 void 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 }