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
do_gma_backlight_set(struct drm_device * dev)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
gma_backlight_enable(struct drm_device * dev)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
gma_backlight_disable(struct drm_device * dev)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
gma_backlight_set(struct drm_device * dev,int v)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
gma_backlight_init(struct drm_device * dev)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
gma_backlight_exit(struct drm_device * dev)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 }
95
