Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 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 | |
Zhao Yakui | d112a81 | 2012-08-08 13:55:55 +0000 | [diff] [blame] | 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 | |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 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; |
Zhao Yakui | d112a81 | 2012-08-08 13:55:55 +0000 | [diff] [blame] | 77 | dev_priv->backlight_enabled = true; |
Alan Cox | bbbb262 | 2011-11-03 18:21:31 +0000 | [diff] [blame] | 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 | } |