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 static void do_gma_backlight_set(struct drm_device *dev)
  30 {
  31 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
  32         struct drm_psb_private *dev_priv = dev->dev_private;
  33         backlight_update_status(dev_priv->backlight_device);
  34 #endif
  35 }
  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 }