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/*

 * Copyright © 2006-2010 Intel Corporation

 * Copyright (c) 2006 Dave Airlie 

 *

 * 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 AUTHORS OR COPYRIGHT HOLDERS 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:

 *	Eric Anholt 

 *      Dave Airlie 

 *      Jesse Barnes 

 *      Chris Wilson 

 */

#include "intel_drv.h"

static inline int pci_read_config_byte(struct pci_dev *dev, int where,

                    u8 *val)

{

    *val = PciRead8(dev->busnr, dev->devfn, where);

    return 1;

}

static inline int pci_write_config_byte(struct pci_dev *dev, int where,

                    u8 val)

{

    PciWrite8(dev->busnr, dev->devfn, where, val);

    return 1;

}

#define PCI_LBPC 0xf4 /* legacy/combination backlight modes */

void

intel_fixed_panel_mode(struct drm_display_mode *fixed_mode,

		       struct drm_display_mode *adjusted_mode)

{

	adjusted_mode->hdisplay = fixed_mode->hdisplay;

	adjusted_mode->hsync_start = fixed_mode->hsync_start;

	adjusted_mode->hsync_end = fixed_mode->hsync_end;

	adjusted_mode->htotal = fixed_mode->htotal;

	adjusted_mode->vdisplay = fixed_mode->vdisplay;

	adjusted_mode->vsync_start = fixed_mode->vsync_start;

	adjusted_mode->vsync_end = fixed_mode->vsync_end;

	adjusted_mode->vtotal = fixed_mode->vtotal;

	adjusted_mode->clock = fixed_mode->clock;

	drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);

}

/* adjusted_mode has been preset to be the panel's fixed mode */

void

intel_pch_panel_fitting(struct drm_device *dev,

			int fitting_mode,

			struct drm_display_mode *mode,

			struct drm_display_mode *adjusted_mode)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	int x, y, width, height;

	x = y = width = height = 0;

	/* Native modes don't need fitting */

	if (adjusted_mode->hdisplay == mode->hdisplay &&

	    adjusted_mode->vdisplay == mode->vdisplay)

		goto done;

	switch (fitting_mode) {

	case DRM_MODE_SCALE_CENTER:

		width = mode->hdisplay;

		height = mode->vdisplay;

		x = (adjusted_mode->hdisplay - width + 1)/2;

		y = (adjusted_mode->vdisplay - height + 1)/2;

		break;

	case DRM_MODE_SCALE_ASPECT:

		/* Scale but preserve the aspect ratio */

		{

			u32 scaled_width = adjusted_mode->hdisplay * mode->vdisplay;

			u32 scaled_height = mode->hdisplay * adjusted_mode->vdisplay;

			if (scaled_width > scaled_height) { /* pillar */

				width = scaled_height / mode->vdisplay;

				if (width & 1)

				    	width++;

				x = (adjusted_mode->hdisplay - width + 1) / 2;

				y = 0;

				height = adjusted_mode->vdisplay;

			} else if (scaled_width < scaled_height) { /* letter */

				height = scaled_width / mode->hdisplay;

				if (height & 1)

				    height++;

				y = (adjusted_mode->vdisplay - height + 1) / 2;

				x = 0;

				width = adjusted_mode->hdisplay;

			} else {

				x = y = 0;

				width = adjusted_mode->hdisplay;

				height = adjusted_mode->vdisplay;

			}

		}

		break;

	default:

	case DRM_MODE_SCALE_FULLSCREEN:

		x = y = 0;

		width = adjusted_mode->hdisplay;

		height = adjusted_mode->vdisplay;

		break;

	}

done:

	dev_priv->pch_pf_pos = (x << 16) | y;

	dev_priv->pch_pf_size = (width << 16) | height;

}

static int is_backlight_combination_mode(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (INTEL_INFO(dev)->gen >= 4)

		return I915_READ(BLC_PWM_CTL2) & BLM_COMBINATION_MODE;

	if (IS_GEN2(dev))

		return I915_READ(BLC_PWM_CTL) & BLM_LEGACY_MODE;

	return 0;

}

static u32 i915_read_blc_pwm_ctl(struct drm_i915_private *dev_priv)

{

	u32 val;

	/* Restore the CTL value if it lost, e.g. GPU reset */

	if (HAS_PCH_SPLIT(dev_priv->dev)) {

		val = I915_READ(BLC_PWM_PCH_CTL2);

		if (dev_priv->saveBLC_PWM_CTL2 == 0) {

			dev_priv->saveBLC_PWM_CTL2 = val;

		} else if (val == 0) {

			I915_WRITE(BLC_PWM_PCH_CTL2,

				   dev_priv->saveBLC_PWM_CTL);

			val = dev_priv->saveBLC_PWM_CTL;

		}

	} else {

		val = I915_READ(BLC_PWM_CTL);

		if (dev_priv->saveBLC_PWM_CTL == 0) {

			dev_priv->saveBLC_PWM_CTL = val;

			dev_priv->saveBLC_PWM_CTL2 = I915_READ(BLC_PWM_CTL2);

		} else if (val == 0) {

			I915_WRITE(BLC_PWM_CTL,

				   dev_priv->saveBLC_PWM_CTL);

			I915_WRITE(BLC_PWM_CTL2,

				   dev_priv->saveBLC_PWM_CTL2);

			val = dev_priv->saveBLC_PWM_CTL;

		}

	}

	return val;

}

u32 intel_panel_get_max_backlight(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 max;

	max = i915_read_blc_pwm_ctl(dev_priv);

	if (max == 0) {

		/* XXX add code here to query mode clock or hardware clock

		 * and program max PWM appropriately.

		 */

        printk(KERN_WARNING "fixme: max PWM is zero.\n");

		return 1;

	}

	if (HAS_PCH_SPLIT(dev)) {

		max >>= 16;

	} else {

		if (INTEL_INFO(dev)->gen < 4)

			max >>= 17;

		else

			max >>= 16;

		if (is_backlight_combination_mode(dev))

			max *= 0xff;

	}

	DRM_DEBUG_DRIVER("max backlight PWM = %d\n", max);

	return max;

}

u32 intel_panel_get_backlight(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 val;

	if (HAS_PCH_SPLIT(dev)) {

		val = I915_READ(BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;

	} else {

		val = I915_READ(BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;

		if (INTEL_INFO(dev)->gen < 4)

			val >>= 1;

		if (is_backlight_combination_mode(dev)) {

			u8 lbpc;

			pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);

			val *= lbpc;

		}

	}

	DRM_DEBUG_DRIVER("get backlight PWM = %d\n", val);

	return val;

}

static void intel_pch_panel_set_backlight(struct drm_device *dev, u32 level)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 val = I915_READ(BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;

	I915_WRITE(BLC_PWM_CPU_CTL, val | level);

}

static void intel_panel_actually_set_backlight(struct drm_device *dev, u32 level)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	u32 tmp;

	DRM_DEBUG_DRIVER("set backlight PWM = %d\n", level);

	if (HAS_PCH_SPLIT(dev))

		return intel_pch_panel_set_backlight(dev, level);

	if (is_backlight_combination_mode(dev)) {

		u32 max = intel_panel_get_max_backlight(dev);

		u8 lbpc;

		lbpc = level * 0xfe / max + 1;

		level /= lbpc;

		pci_write_config_byte(dev->pdev, PCI_LBPC, lbpc);

	}

	tmp = I915_READ(BLC_PWM_CTL);

	if (INTEL_INFO(dev)->gen < 4)

		level <<= 1;

		tmp &= ~BACKLIGHT_DUTY_CYCLE_MASK;

	I915_WRITE(BLC_PWM_CTL, tmp | level);

}

void intel_panel_set_backlight(struct drm_device *dev, u32 level)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	dev_priv->backlight_level = level;

	if (dev_priv->backlight_enabled)

		intel_panel_actually_set_backlight(dev, level);

}

void intel_panel_disable_backlight(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

		dev_priv->backlight_enabled = false;

	intel_panel_actually_set_backlight(dev, 0);

}

void intel_panel_enable_backlight(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (dev_priv->backlight_level == 0)

		dev_priv->backlight_level = intel_panel_get_max_backlight(dev);

	dev_priv->backlight_enabled = true;

	intel_panel_actually_set_backlight(dev, dev_priv->backlight_level);

}

static void intel_panel_init_backlight(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	dev_priv->backlight_level = intel_panel_get_backlight(dev);

	dev_priv->backlight_enabled = dev_priv->backlight_level != 0;

}

enum drm_connector_status

intel_panel_detect(struct drm_device *dev)

{

#if 0

	struct drm_i915_private *dev_priv = dev->dev_private;

#endif

	if (i915_panel_ignore_lid)

		return i915_panel_ignore_lid > 0 ?

			connector_status_connected :

			connector_status_disconnected;

	/* opregion lid state on HP 2540p is wrong at boot up,

	 * appears to be either the BIOS or Linux ACPI fault */

#if 0

	/* Assume that the BIOS does not lie through the OpRegion... */

	if (dev_priv->opregion.lid_state)

		return ioread32(dev_priv->opregion.lid_state) & 0x1 ?

			connector_status_connected :

			connector_status_disconnected;

#endif

	return connector_status_unknown;

}

#ifdef CONFIG_BACKLIGHT_CLASS_DEVICE

static int intel_panel_update_status(struct backlight_device *bd)

{

	struct drm_device *dev = bl_get_data(bd);

	intel_panel_set_backlight(dev, bd->props.brightness);

	return 0;

}

static int intel_panel_get_brightness(struct backlight_device *bd)

{

	struct drm_device *dev = bl_get_data(bd);

	struct drm_i915_private *dev_priv = dev->dev_private;

	return dev_priv->backlight_level;

}

static const struct backlight_ops intel_panel_bl_ops = {

	.update_status = intel_panel_update_status,

	.get_brightness = intel_panel_get_brightness,

};

int intel_panel_setup_backlight(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct backlight_properties props;

	struct drm_connector *connector;

	intel_panel_init_backlight(dev);

	if (dev_priv->int_lvds_connector)

		connector = dev_priv->int_lvds_connector;

	else if (dev_priv->int_edp_connector)

		connector = dev_priv->int_edp_connector;

	else

		return -ENODEV;

	props.type = BACKLIGHT_RAW;

	props.max_brightness = intel_panel_get_max_backlight(dev);

	dev_priv->backlight =

		backlight_device_register("intel_backlight",

					  &connector->kdev, dev,

					  &intel_panel_bl_ops, &props);

	if (IS_ERR(dev_priv->backlight)) {

		DRM_ERROR("Failed to register backlight: %ld\n",

			  PTR_ERR(dev_priv->backlight));

		dev_priv->backlight = NULL;

		return -ENODEV;

	}

	dev_priv->backlight->props.brightness = intel_panel_get_backlight(dev);

	return 0;

}

void intel_panel_destroy_backlight(struct drm_device *dev)

{

	struct drm_i915_private *dev_priv = dev->dev_private;

	if (dev_priv->backlight)

		backlight_device_unregister(dev_priv->backlight);

}

#else

int intel_panel_setup_backlight(struct drm_device *dev)

{

	intel_panel_init_backlight(dev);

	return 0;

}

void intel_panel_destroy_backlight(struct drm_device *dev)

{

	return;

}

#endif