From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- drivers/gpu/drm/gma500/backlight.c | 115 +++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 drivers/gpu/drm/gma500/backlight.c (limited to 'drivers/gpu/drm/gma500/backlight.c') diff --git a/drivers/gpu/drm/gma500/backlight.c b/drivers/gpu/drm/gma500/backlight.c new file mode 100644 index 000000000..577a4987b --- /dev/null +++ b/drivers/gpu/drm/gma500/backlight.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * GMA500 Backlight Interface + * + * Copyright (c) 2009-2011, Intel Corporation. + * + * Authors: Eric Knopp + */ + +#include + +#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 +} -- cgit v1.2.3