118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* GMA500 Backlight Interface
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*
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* Copyright (c) 2009-2011, Intel Corporation.
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*
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* Authors: Eric Knopp
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*/
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#include <linux/backlight.h>
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#include <acpi/video.h>
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#include "psb_drv.h"
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#include "psb_intel_reg.h"
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#include "psb_intel_drv.h"
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#include "intel_bios.h"
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#include "power.h"
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void gma_backlight_enable(struct drm_device *dev)
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{
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struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
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dev_priv->backlight_enabled = true;
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dev_priv->ops->backlight_set(dev, dev_priv->backlight_level);
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}
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void gma_backlight_disable(struct drm_device *dev)
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{
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struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
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dev_priv->backlight_enabled = false;
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dev_priv->ops->backlight_set(dev, 0);
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}
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void gma_backlight_set(struct drm_device *dev, int v)
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{
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struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
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dev_priv->backlight_level = v;
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if (dev_priv->backlight_enabled)
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dev_priv->ops->backlight_set(dev, v);
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}
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static int gma_backlight_get_brightness(struct backlight_device *bd)
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{
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struct drm_device *dev = bl_get_data(bd);
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struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
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if (dev_priv->ops->backlight_get)
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return dev_priv->ops->backlight_get(dev);
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return dev_priv->backlight_level;
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}
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static int gma_backlight_update_status(struct backlight_device *bd)
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{
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struct drm_device *dev = bl_get_data(bd);
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int level = backlight_get_brightness(bd);
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/* Percentage 1-100% being valid */
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if (level < 1)
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level = 1;
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gma_backlight_set(dev, level);
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return 0;
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}
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static const struct backlight_ops gma_backlight_ops __maybe_unused = {
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.get_brightness = gma_backlight_get_brightness,
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.update_status = gma_backlight_update_status,
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};
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int gma_backlight_init(struct drm_device *dev)
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{
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struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
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struct backlight_properties props __maybe_unused = {};
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int ret;
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dev_priv->backlight_enabled = true;
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dev_priv->backlight_level = 100;
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ret = dev_priv->ops->backlight_init(dev);
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if (ret)
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return ret;
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if (!acpi_video_backlight_use_native()) {
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drm_info(dev, "Skipping %s backlight registration\n",
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dev_priv->ops->backlight_name);
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return 0;
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}
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#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
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props.brightness = dev_priv->backlight_level;
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props.max_brightness = PSB_MAX_BRIGHTNESS;
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props.type = BACKLIGHT_RAW;
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dev_priv->backlight_device =
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backlight_device_register(dev_priv->ops->backlight_name,
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dev->dev, dev,
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&gma_backlight_ops, &props);
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if (IS_ERR(dev_priv->backlight_device))
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return PTR_ERR(dev_priv->backlight_device);
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#endif
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return 0;
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}
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void gma_backlight_exit(struct drm_device *dev)
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{
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#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE
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struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
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if (dev_priv->backlight_device)
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backlight_device_unregister(dev_priv->backlight_device);
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#endif
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}
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