drivers/staging/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 int gma_backlight_init(struct drm_device *dev)
  30 {
  31 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
  32         struct drm_psb_private *dev_priv = dev->dev_private;
  33         return dev_priv->ops->backlight_init(dev);
  34 #else
  35         return 0;
  36 #endif
  37 }
  38
  39 void gma_backlight_exit(struct drm_device *dev)
  40 {
  41 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
  42         struct drm_psb_private *dev_priv = dev->dev_private;
  43         if (dev_priv->backlight_device) {
  44                 dev_priv->backlight_device->props.brightness = 0;
  45                 backlight_update_status(dev_priv->backlight_device);
  46                 backlight_device_unregister(dev_priv->backlight_device);
  47         }
  48 #endif
  49 }