drm/gma500/backlight.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * GMA500 Backlight Interface
0004  *
0005  * Copyright (c) 2009-2011, Intel Corporation.
0006  *
0007  * Authors: Eric Knopp
0008  */
0009
0010 #include "psb_drv.h"
0011 #include "psb_intel_reg.h"
0012 #include "psb_intel_drv.h"
0013 #include "intel_bios.h"
0014 #include "power.h"
0015
0016 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
0017 static void do_gma_backlight_set(struct drm_device *dev)
0018 {
0019     struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
0020     backlight_update_status(dev_priv->backlight_device);
0021 }
0022 #endif
0023
0024 void gma_backlight_enable(struct drm_device *dev)
0025 {
0026 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
0027     struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
0028     dev_priv->backlight_enabled = true;
0029     if (dev_priv->backlight_device) {
0030         dev_priv->backlight_device->props.brightness = dev_priv->backlight_level;
0031         do_gma_backlight_set(dev);
0032     }
0033 #endif
0034 }
0035
0036 void gma_backlight_disable(struct drm_device *dev)
0037 {
0038 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
0039     struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
0040     dev_priv->backlight_enabled = false;
0041     if (dev_priv->backlight_device) {
0042         dev_priv->backlight_device->props.brightness = 0;
0043         do_gma_backlight_set(dev);
0044     }
0045 #endif
0046 }
0047
0048 void gma_backlight_set(struct drm_device *dev, int v)
0049 {
0050 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
0051     struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
0052     dev_priv->backlight_level = v;
0053     if (dev_priv->backlight_device && dev_priv->backlight_enabled) {
0054         dev_priv->backlight_device->props.brightness = v;
0055         do_gma_backlight_set(dev);
0056     }
0057 #endif
0058 }
0059
0060 int gma_backlight_init(struct drm_device *dev)
0061 {
0062 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
0063     struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
0064     dev_priv->backlight_enabled = true;
0065     return dev_priv->ops->backlight_init(dev);
0066 #else
0067     return 0;
0068 #endif
0069 }
0070
0071 void gma_backlight_exit(struct drm_device *dev)
0072 {
0073 #ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
0074     struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
0075     if (dev_priv->backlight_device) {
0076         dev_priv->backlight_device->props.brightness = 0;
0077         backlight_update_status(dev_priv->backlight_device);
0078         backlight_device_unregister(dev_priv->backlight_device);
0079     }
0080 #endif
0081 }