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 } 95