1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * GMA500 Backlight Interface 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (c) 2009-2011, Intel Corporation. 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * Authors: Eric Knopp 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include "psb_drv.h" 11*4882a593Smuzhiyun #include "psb_intel_reg.h" 12*4882a593Smuzhiyun #include "psb_intel_drv.h" 13*4882a593Smuzhiyun #include "intel_bios.h" 14*4882a593Smuzhiyun #include "power.h" 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE do_gma_backlight_set(struct drm_device * dev)17*4882a593Smuzhiyunstatic void do_gma_backlight_set(struct drm_device *dev) 18*4882a593Smuzhiyun { 19*4882a593Smuzhiyun struct drm_psb_private *dev_priv = dev->dev_private; 20*4882a593Smuzhiyun backlight_update_status(dev_priv->backlight_device); 21*4882a593Smuzhiyun } 22*4882a593Smuzhiyun #endif 23*4882a593Smuzhiyun gma_backlight_enable(struct drm_device * dev)24*4882a593Smuzhiyunvoid gma_backlight_enable(struct drm_device *dev) 25*4882a593Smuzhiyun { 26*4882a593Smuzhiyun #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 27*4882a593Smuzhiyun struct drm_psb_private *dev_priv = dev->dev_private; 28*4882a593Smuzhiyun dev_priv->backlight_enabled = true; 29*4882a593Smuzhiyun if (dev_priv->backlight_device) { 30*4882a593Smuzhiyun dev_priv->backlight_device->props.brightness = dev_priv->backlight_level; 31*4882a593Smuzhiyun do_gma_backlight_set(dev); 32*4882a593Smuzhiyun } 33*4882a593Smuzhiyun #endif 34*4882a593Smuzhiyun } 35*4882a593Smuzhiyun gma_backlight_disable(struct drm_device * dev)36*4882a593Smuzhiyunvoid gma_backlight_disable(struct drm_device *dev) 37*4882a593Smuzhiyun { 38*4882a593Smuzhiyun #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 39*4882a593Smuzhiyun struct drm_psb_private *dev_priv = dev->dev_private; 40*4882a593Smuzhiyun dev_priv->backlight_enabled = false; 41*4882a593Smuzhiyun if (dev_priv->backlight_device) { 42*4882a593Smuzhiyun dev_priv->backlight_device->props.brightness = 0; 43*4882a593Smuzhiyun do_gma_backlight_set(dev); 44*4882a593Smuzhiyun } 45*4882a593Smuzhiyun #endif 46*4882a593Smuzhiyun } 47*4882a593Smuzhiyun gma_backlight_set(struct drm_device * dev,int v)48*4882a593Smuzhiyunvoid gma_backlight_set(struct drm_device *dev, int v) 49*4882a593Smuzhiyun { 50*4882a593Smuzhiyun #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 51*4882a593Smuzhiyun struct drm_psb_private *dev_priv = dev->dev_private; 52*4882a593Smuzhiyun dev_priv->backlight_level = v; 53*4882a593Smuzhiyun if (dev_priv->backlight_device && dev_priv->backlight_enabled) { 54*4882a593Smuzhiyun dev_priv->backlight_device->props.brightness = v; 55*4882a593Smuzhiyun do_gma_backlight_set(dev); 56*4882a593Smuzhiyun } 57*4882a593Smuzhiyun #endif 58*4882a593Smuzhiyun } 59*4882a593Smuzhiyun gma_backlight_init(struct drm_device * dev)60*4882a593Smuzhiyunint gma_backlight_init(struct drm_device *dev) 61*4882a593Smuzhiyun { 62*4882a593Smuzhiyun #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 63*4882a593Smuzhiyun struct drm_psb_private *dev_priv = dev->dev_private; 64*4882a593Smuzhiyun dev_priv->backlight_enabled = true; 65*4882a593Smuzhiyun return dev_priv->ops->backlight_init(dev); 66*4882a593Smuzhiyun #else 67*4882a593Smuzhiyun return 0; 68*4882a593Smuzhiyun #endif 69*4882a593Smuzhiyun } 70*4882a593Smuzhiyun gma_backlight_exit(struct drm_device * dev)71*4882a593Smuzhiyunvoid gma_backlight_exit(struct drm_device *dev) 72*4882a593Smuzhiyun { 73*4882a593Smuzhiyun #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE 74*4882a593Smuzhiyun struct drm_psb_private *dev_priv = dev->dev_private; 75*4882a593Smuzhiyun if (dev_priv->backlight_device) { 76*4882a593Smuzhiyun dev_priv->backlight_device->props.brightness = 0; 77*4882a593Smuzhiyun backlight_update_status(dev_priv->backlight_device); 78*4882a593Smuzhiyun backlight_device_unregister(dev_priv->backlight_device); 79*4882a593Smuzhiyun } 80*4882a593Smuzhiyun #endif 81*4882a593Smuzhiyun } 82