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