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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120// SPDX-License-Identifier: GPL-2.0-only/* * GMA500 Backlight Interface * * Copyright (c) 2009-2011, Intel Corporation. * * Authors: Eric Knopp */
#include <linux/backlight.h>
#include <acpi/video.h>
#include <drm/drm_print.h>
#include "psb_drv.h"#include "psb_intel_reg.h"#include "psb_intel_drv.h"#include "intel_bios.h"#include "power.h"
void gma_backlight_enable(struct drm_device *dev){ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
dev_priv->backlight_enabled = true; dev_priv->ops->backlight_set(dev, dev_priv->backlight_level);}
void gma_backlight_disable(struct drm_device *dev){ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
dev_priv->backlight_enabled = false; dev_priv->ops->backlight_set(dev, 0);}
void gma_backlight_set(struct drm_device *dev, int v){ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
dev_priv->backlight_level = v; if (dev_priv->backlight_enabled) dev_priv->ops->backlight_set(dev, v);}
static int gma_backlight_get_brightness(struct backlight_device *bd){ struct drm_device *dev = bl_get_data(bd); struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
if (dev_priv->ops->backlight_get) return dev_priv->ops->backlight_get(dev);
return dev_priv->backlight_level;}
static int gma_backlight_update_status(struct backlight_device *bd){ struct drm_device *dev = bl_get_data(bd); int level = backlight_get_brightness(bd);
/* Percentage 1-100% being valid */ if (level < 1) level = 1;
gma_backlight_set(dev, level); return 0;}
static const struct backlight_ops gma_backlight_ops __maybe_unused = { .get_brightness = gma_backlight_get_brightness, .update_status = gma_backlight_update_status,};
int gma_backlight_init(struct drm_device *dev){ struct drm_psb_private *dev_priv = to_drm_psb_private(dev); struct backlight_properties props __maybe_unused = {}; int ret;
dev_priv->backlight_enabled = true; dev_priv->backlight_level = 100;
ret = dev_priv->ops->backlight_init(dev); if (ret) return ret;
if (!acpi_video_backlight_use_native()) { drm_info(dev, "Skipping %s backlight registration\n", dev_priv->ops->backlight_name); return 0; }
#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE props.brightness = dev_priv->backlight_level; props.max_brightness = PSB_MAX_BRIGHTNESS; props.type = BACKLIGHT_RAW;
dev_priv->backlight_device = backlight_device_register(dev_priv->ops->backlight_name, dev->dev, dev, &gma_backlight_ops, &props); if (IS_ERR(dev_priv->backlight_device)) return PTR_ERR(dev_priv->backlight_device);#endif
return 0;}
void gma_backlight_exit(struct drm_device *dev){#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
if (dev_priv->backlight_device) backlight_device_unregister(dev_priv->backlight_device);#endif}