drivers/gpu/drm/nouveau/nouveau_backlight.c - maze/linux - Git at Google

 /*
  * Copyright (C) 2009 Red Hat <mjg@redhat.com>
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files (the
  * "Software"), to deal in the Software without restriction, including
  * without limitation the rights to use, copy, modify, merge, publish,
  * distribute, sublicense, and/or sell copies of the Software, and to
  * permit persons to whom the Software is furnished to do so, subject to
  * the following conditions:
  *
  * The above copyright notice and this permission notice (including the
  * next paragraph) shall be included in all copies or substantial
  * portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  *
  */

 /*
  * Authors:
  *  Matthew Garrett <mjg@redhat.com>
  *
  * Register locations derived from NVClock by Roderick Colenbrander
  */

 #include <linux/backlight.h>
 #include <linux/acpi.h>

 #include "drmP.h"
 #include "nouveau_drv.h"
 #include "nouveau_drm.h"
 #include "nouveau_reg.h"
 #include "nouveau_encoder.h"

 static int
 nv40_get_intensity(struct backlight_device *bd)
 {
 	struct drm_device *dev = bl_get_data(bd);
 	int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
 									>> 16;

 	return val;
 }

 static int
 nv40_set_intensity(struct backlight_device *bd)
 {
 	struct drm_device *dev = bl_get_data(bd);
 	int val = bd->props.brightness;
 	int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);

 	nv_wr32(dev, NV40_PMC_BACKLIGHT,
 		 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));

 	return 0;
 }

 static const struct backlight_ops nv40_bl_ops = {
 	.options = BL_CORE_SUSPENDRESUME,
 	.get_brightness = nv40_get_intensity,
 	.update_status = nv40_set_intensity,
 };

 static int
 nv40_backlight_init(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct backlight_properties props;
 	struct backlight_device *bd;

 	if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
 		return 0;

 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.max_brightness = 31;
 	bd = backlight_device_register("nv_backlight", &connector->kdev, dev,
 				       &nv40_bl_ops, &props);
 	if (IS_ERR(bd))
 		return PTR_ERR(bd);

 	dev_priv->backlight = bd;
 	bd->props.brightness = nv40_get_intensity(bd);
 	backlight_update_status(bd);

 	return 0;
 }

 static int
 nv50_get_intensity(struct backlight_device *bd)
 {
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct drm_device *dev = nv_encoder->base.base.dev;
 	int or = nv_encoder->or;
 	u32 div = 1025;
 	u32 val;

 	val  = nv_rd32(dev, NV50_PDISP_SOR_PWM_CTL(or));
 	val &= NV50_PDISP_SOR_PWM_CTL_VAL;
 	return ((val * 100) + (div / 2)) / div;
 }

 static int
 nv50_set_intensity(struct backlight_device *bd)
 {
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct drm_device *dev = nv_encoder->base.base.dev;
 	int or = nv_encoder->or;
 	u32 div = 1025;
 	u32 val = (bd->props.brightness * div) / 100;

 	nv_wr32(dev, NV50_PDISP_SOR_PWM_CTL(or),
 		     NV50_PDISP_SOR_PWM_CTL_NEW | val);
 	return 0;
 }

 static const struct backlight_ops nv50_bl_ops = {
 	.options = BL_CORE_SUSPENDRESUME,
 	.get_brightness = nv50_get_intensity,
 	.update_status = nv50_set_intensity,
 };

 static int
 nva3_get_intensity(struct backlight_device *bd)
 {
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct drm_device *dev = nv_encoder->base.base.dev;
 	int or = nv_encoder->or;
 	u32 div, val;

 	div  = nv_rd32(dev, NV50_PDISP_SOR_PWM_DIV(or));
 	val  = nv_rd32(dev, NV50_PDISP_SOR_PWM_CTL(or));
 	val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
 	if (div && div >= val)
 		return ((val * 100) + (div / 2)) / div;

 	return 100;
 }

 static int
 nva3_set_intensity(struct backlight_device *bd)
 {
 	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
 	struct drm_device *dev = nv_encoder->base.base.dev;
 	int or = nv_encoder->or;
 	u32 div, val;

 	div = nv_rd32(dev, NV50_PDISP_SOR_PWM_DIV(or));
 	val = (bd->props.brightness * div) / 100;
 	if (div) {
 		nv_wr32(dev, NV50_PDISP_SOR_PWM_CTL(or), val |
 			     NV50_PDISP_SOR_PWM_CTL_NEW |
 			     NVA3_PDISP_SOR_PWM_CTL_UNK);
 		return 0;
 	}

 	return -EINVAL;
 }

 static const struct backlight_ops nva3_bl_ops = {
 	.options = BL_CORE_SUSPENDRESUME,
 	.get_brightness = nva3_get_intensity,
 	.update_status = nva3_set_intensity,
 };

 static int
 nv50_backlight_init(struct drm_connector *connector)
 {
 	struct drm_device *dev = connector->dev;
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct nouveau_encoder *nv_encoder;
 	struct backlight_properties props;
 	struct backlight_device *bd;
 	const struct backlight_ops *ops;

 	nv_encoder = find_encoder(connector, OUTPUT_LVDS);
 	if (!nv_encoder) {
 		nv_encoder = find_encoder(connector, OUTPUT_DP);
 		if (!nv_encoder)
 			return -ENODEV;
 	}

 	if (!nv_rd32(dev, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
 		return 0;

 	if (dev_priv->chipset <= 0xa0 ||
 	    dev_priv->chipset == 0xaa ||
 	    dev_priv->chipset == 0xac)
 		ops = &nv50_bl_ops;
 	else
 		ops = &nva3_bl_ops;

 	memset(&props, 0, sizeof(struct backlight_properties));
 	props.type = BACKLIGHT_RAW;
 	props.max_brightness = 100;
 	bd = backlight_device_register("nv_backlight", &connector->kdev,
 				       nv_encoder, ops, &props);
 	if (IS_ERR(bd))
 		return PTR_ERR(bd);

 	dev_priv->backlight = bd;
 	bd->props.brightness = bd->ops->get_brightness(bd);
 	backlight_update_status(bd);
 	return 0;
 }

 int
 nouveau_backlight_init(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;
 	struct drm_connector *connector;

 #ifdef CONFIG_ACPI
 	if (acpi_video_backlight_support()) {
 		NV_INFO(dev, "ACPI backlight interface available, "
 			     "not registering our own\n");
 		return 0;
 	}
 #endif

 	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 		if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
 		    connector->connector_type != DRM_MODE_CONNECTOR_eDP)
 			continue;

 		switch (dev_priv->card_type) {
 		case NV_40:
 			return nv40_backlight_init(connector);
 		case NV_50:
 			return nv50_backlight_init(connector);
 		default:
 			break;
 		}
 	}


 	return 0;
 }

 void
 nouveau_backlight_exit(struct drm_device *dev)
 {
 	struct drm_nouveau_private *dev_priv = dev->dev_private;

 	if (dev_priv->backlight) {
 		backlight_device_unregister(dev_priv->backlight);
 		dev_priv->backlight = NULL;
 	}
 }
	/*
	* Copyright (C) 2009 Red Hat <mjg@redhat.com>
	*
	* Permission is hereby granted, free of charge, to any person obtaining
	* a copy of this software and associated documentation files (the
	* "Software"), to deal in the Software without restriction, including
	* without limitation the rights to use, copy, modify, merge, publish,
	* distribute, sublicense, and/or sell copies of the Software, and to
	* permit persons to whom the Software is furnished to do so, subject to
	* the following conditions:
	*
	* The above copyright notice and this permission notice (including the
	* next paragraph) shall be included in all copies or substantial
	* portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
	* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
	* IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
	* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
	* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	*
	*/

	/*
	* Authors:
	* Matthew Garrett <mjg@redhat.com>
	*
	* Register locations derived from NVClock by Roderick Colenbrander
	*/

	#include <linux/backlight.h>
	#include <linux/acpi.h>

	#include "drmP.h"
	#include "nouveau_drv.h"
	#include "nouveau_drm.h"
	#include "nouveau_reg.h"
	#include "nouveau_encoder.h"

	static int
	nv40_get_intensity(struct backlight_device *bd)
	{
	struct drm_device *dev = bl_get_data(bd);
	int val = (nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)
	>> 16;

	return val;
	}

	static int
	nv40_set_intensity(struct backlight_device *bd)
	{
	struct drm_device *dev = bl_get_data(bd);
	int val = bd->props.brightness;
	int reg = nv_rd32(dev, NV40_PMC_BACKLIGHT);

	nv_wr32(dev, NV40_PMC_BACKLIGHT,
	(val << 16) \| (reg & ~NV40_PMC_BACKLIGHT_MASK));

	return 0;
	}

	static const struct backlight_ops nv40_bl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = nv40_get_intensity,
	.update_status = nv40_set_intensity,
	};

	static int
	nv40_backlight_init(struct drm_connector *connector)
	{
	struct drm_device *dev = connector->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct backlight_properties props;
	struct backlight_device *bd;

	if (!(nv_rd32(dev, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
	return 0;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = 31;
	bd = backlight_device_register("nv_backlight", &connector->kdev, dev,
	&nv40_bl_ops, &props);
	if (IS_ERR(bd))
	return PTR_ERR(bd);

	dev_priv->backlight = bd;
	bd->props.brightness = nv40_get_intensity(bd);
	backlight_update_status(bd);

	return 0;
	}

	static int
	nv50_get_intensity(struct backlight_device *bd)
	{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct drm_device *dev = nv_encoder->base.base.dev;
	int or = nv_encoder->or;
	u32 div = 1025;
	u32 val;

	val = nv_rd32(dev, NV50_PDISP_SOR_PWM_CTL(or));
	val &= NV50_PDISP_SOR_PWM_CTL_VAL;
	return ((val * 100) + (div / 2)) / div;
	}

	static int
	nv50_set_intensity(struct backlight_device *bd)
	{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct drm_device *dev = nv_encoder->base.base.dev;
	int or = nv_encoder->or;
	u32 div = 1025;
	u32 val = (bd->props.brightness * div) / 100;

	nv_wr32(dev, NV50_PDISP_SOR_PWM_CTL(or),
	NV50_PDISP_SOR_PWM_CTL_NEW \| val);
	return 0;
	}

	static const struct backlight_ops nv50_bl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = nv50_get_intensity,
	.update_status = nv50_set_intensity,
	};

	static int
	nva3_get_intensity(struct backlight_device *bd)
	{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct drm_device *dev = nv_encoder->base.base.dev;
	int or = nv_encoder->or;
	u32 div, val;

	div = nv_rd32(dev, NV50_PDISP_SOR_PWM_DIV(or));
	val = nv_rd32(dev, NV50_PDISP_SOR_PWM_CTL(or));
	val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
	if (div && div >= val)
	return ((val * 100) + (div / 2)) / div;

	return 100;
	}

	static int
	nva3_set_intensity(struct backlight_device *bd)
	{
	struct nouveau_encoder *nv_encoder = bl_get_data(bd);
	struct drm_device *dev = nv_encoder->base.base.dev;
	int or = nv_encoder->or;
	u32 div, val;

	div = nv_rd32(dev, NV50_PDISP_SOR_PWM_DIV(or));
	val = (bd->props.brightness * div) / 100;
	if (div) {
	nv_wr32(dev, NV50_PDISP_SOR_PWM_CTL(or), val \|
	NV50_PDISP_SOR_PWM_CTL_NEW \|
	NVA3_PDISP_SOR_PWM_CTL_UNK);
	return 0;
	}

	return -EINVAL;
	}

	static const struct backlight_ops nva3_bl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = nva3_get_intensity,
	.update_status = nva3_set_intensity,
	};

	static int
	nv50_backlight_init(struct drm_connector *connector)
	{
	struct drm_device *dev = connector->dev;
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nouveau_encoder *nv_encoder;
	struct backlight_properties props;
	struct backlight_device *bd;
	const struct backlight_ops *ops;

	nv_encoder = find_encoder(connector, OUTPUT_LVDS);
	if (!nv_encoder) {
	nv_encoder = find_encoder(connector, OUTPUT_DP);
	if (!nv_encoder)
	return -ENODEV;
	}

	if (!nv_rd32(dev, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or)))
	return 0;

	if (dev_priv->chipset <= 0xa0 \|\|
	dev_priv->chipset == 0xaa \|\|
	dev_priv->chipset == 0xac)
	ops = &nv50_bl_ops;
	else
	ops = &nva3_bl_ops;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = 100;
	bd = backlight_device_register("nv_backlight", &connector->kdev,
	nv_encoder, ops, &props);
	if (IS_ERR(bd))
	return PTR_ERR(bd);

	dev_priv->backlight = bd;
	bd->props.brightness = bd->ops->get_brightness(bd);
	backlight_update_status(bd);
	return 0;
	}

	int
	nouveau_backlight_init(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct drm_connector *connector;

	#ifdef CONFIG_ACPI
	if (acpi_video_backlight_support()) {
	NV_INFO(dev, "ACPI backlight interface available, "
	"not registering our own\n");
	return 0;
	}
	#endif

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS &&
	connector->connector_type != DRM_MODE_CONNECTOR_eDP)
	continue;

	switch (dev_priv->card_type) {
	case NV_40:
	return nv40_backlight_init(connector);
	case NV_50:
	return nv50_backlight_init(connector);
	default:
	break;
	}
	}


	return 0;
	}

	void
	nouveau_backlight_exit(struct drm_device *dev)
	{
	struct drm_nouveau_private *dev_priv = dev->dev_private;

	if (dev_priv->backlight) {
	backlight_device_unregister(dev_priv->backlight);
	dev_priv->backlight = NULL;
	}
	}