/*
 * Copyright (C) 2011 Samsung Electronics Co.Ltd
 * Authors:
 *	Inki Dae <inki.dae@samsung.com>
 *	Seung-Woo Kim <sw0312.kim@samsung.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */

#include "drmP.h"

#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>

#include <drm/exynos_drm.h>

#include "exynos_drm_drv.h"
#include "exynos_drm_hdmi.h"

#define to_context(dev)		platform_get_drvdata(to_platform_device(dev))
#define to_subdrv(dev)		to_context(dev)
#define get_ctx_from_subdrv(subdrv)	container_of(subdrv,\
					struct drm_hdmi_context, subdrv);

/* these callback points shoud be set by specific drivers. */
static struct exynos_hdmi_display_ops *hdmi_display_ops;
static struct exynos_hdmi_manager_ops *hdmi_manager_ops;
static struct exynos_hdmi_overlay_ops *hdmi_overlay_ops;

struct drm_hdmi_context {
	struct exynos_drm_subdrv	subdrv;
	struct exynos_drm_hdmi_context	*hdmi_ctx;
	struct exynos_drm_hdmi_context	*mixer_ctx;
	struct work_struct		work;
};

void exynos_drm_display_ops_register(struct exynos_hdmi_display_ops
					*display_ops)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (display_ops)
		hdmi_display_ops = display_ops;
}
EXPORT_SYMBOL(exynos_drm_display_ops_register);

void exynos_drm_manager_ops_register(struct exynos_hdmi_manager_ops
					*manager_ops)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (manager_ops)
		hdmi_manager_ops = manager_ops;
}
EXPORT_SYMBOL(exynos_drm_manager_ops_register);

void exynos_drm_overlay_ops_register(struct exynos_hdmi_overlay_ops
					*overlay_ops)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (overlay_ops)
		hdmi_overlay_ops = overlay_ops;
}
EXPORT_SYMBOL(exynos_drm_overlay_ops_register);

static bool drm_hdmi_is_connected(struct device *dev)
{
	struct drm_hdmi_context *ctx = to_context(dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_display_ops && hdmi_display_ops->is_connected)
		return hdmi_display_ops->is_connected(ctx->hdmi_ctx->ctx);

	return false;
}

static int drm_hdmi_get_edid(struct device *dev,
		struct drm_connector *connector, u8 *edid, int len)
{
	struct drm_hdmi_context *ctx = to_context(dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_display_ops && hdmi_display_ops->get_edid)
		return hdmi_display_ops->get_edid(ctx->hdmi_ctx->ctx,
				connector, edid, len);

	return 0;
}

static int drm_hdmi_check_timing(struct device *dev, void *timing)
{
	struct drm_hdmi_context *ctx = to_context(dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_display_ops && hdmi_display_ops->check_timing)
		return hdmi_display_ops->check_timing(ctx->hdmi_ctx->ctx,
				timing);

	return 0;
}

static int drm_hdmi_power_on(struct device *dev, int mode)
{
	struct drm_hdmi_context *ctx = to_context(dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_display_ops && hdmi_display_ops->power_on)
		return hdmi_display_ops->power_on(ctx->hdmi_ctx->ctx, mode);

	return 0;
}

static struct exynos_drm_display_ops drm_hdmi_display_ops = {
	.type = EXYNOS_DISPLAY_TYPE_HDMI,
	.is_connected = drm_hdmi_is_connected,
	.get_edid = drm_hdmi_get_edid,
	.check_timing = drm_hdmi_check_timing,
	.power_on = drm_hdmi_power_on,
};

static int drm_hdmi_enable_vblank(struct device *subdrv_dev)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);
	struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
	struct exynos_drm_manager *manager = &subdrv->manager;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_overlay_ops && hdmi_overlay_ops->enable_vblank)
		return hdmi_overlay_ops->enable_vblank(ctx->mixer_ctx->ctx,
							manager->pipe);

	return 0;
}

static void drm_hdmi_disable_vblank(struct device *subdrv_dev)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_overlay_ops && hdmi_overlay_ops->disable_vblank)
		return hdmi_overlay_ops->disable_vblank(ctx->mixer_ctx->ctx);
}

static void drm_hdmi_mode_set(struct device *subdrv_dev, void *mode)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_manager_ops && hdmi_manager_ops->mode_set)
		hdmi_manager_ops->mode_set(ctx->hdmi_ctx->ctx, mode);
}

static void drm_hdmi_commit(struct device *subdrv_dev)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_manager_ops && hdmi_manager_ops->commit)
		hdmi_manager_ops->commit(ctx->hdmi_ctx->ctx);
}

static void drm_hdmi_dpms(struct device *subdrv_dev, int mode)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	switch (mode) {
	case DRM_MODE_DPMS_ON:
		break;
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
	case DRM_MODE_DPMS_OFF:
		if (hdmi_manager_ops && hdmi_manager_ops->disable)
			hdmi_manager_ops->disable(ctx->hdmi_ctx->ctx);
		break;
	default:
		DRM_DEBUG_KMS("unkown dps mode: %d\n", mode);
		break;
	}
}

static struct exynos_drm_manager_ops drm_hdmi_manager_ops = {
	.dpms = drm_hdmi_dpms,
	.enable_vblank = drm_hdmi_enable_vblank,
	.disable_vblank = drm_hdmi_disable_vblank,
	.mode_set = drm_hdmi_mode_set,
	.commit = drm_hdmi_commit,
};

static void drm_mixer_mode_set(struct device *subdrv_dev,
		struct exynos_drm_overlay *overlay)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_overlay_ops && hdmi_overlay_ops->win_mode_set)
		hdmi_overlay_ops->win_mode_set(ctx->mixer_ctx->ctx, overlay);
}

static void drm_mixer_commit(struct device *subdrv_dev, int zpos)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_overlay_ops && hdmi_overlay_ops->win_commit)
		hdmi_overlay_ops->win_commit(ctx->mixer_ctx->ctx, zpos);
}

static void drm_mixer_disable(struct device *subdrv_dev, int zpos)
{
	struct drm_hdmi_context *ctx = to_context(subdrv_dev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (hdmi_overlay_ops && hdmi_overlay_ops->win_disable)
		hdmi_overlay_ops->win_disable(ctx->mixer_ctx->ctx, zpos);
}

static struct exynos_drm_overlay_ops drm_hdmi_overlay_ops = {
	.mode_set = drm_mixer_mode_set,
	.commit = drm_mixer_commit,
	.disable = drm_mixer_disable,
};


static int hdmi_subdrv_probe(struct drm_device *drm_dev,
		struct device *dev)
{
	struct exynos_drm_subdrv *subdrv = to_subdrv(dev);
	struct drm_hdmi_context *ctx;
	struct platform_device *pdev = to_platform_device(dev);
	struct exynos_drm_common_hdmi_pd *pd;
	int ret;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	pd = pdev->dev.platform_data;

	if (!pd) {
		DRM_DEBUG_KMS("platform data is null.\n");
		return -EFAULT;
	}

	if (!pd->hdmi_dev) {
		DRM_DEBUG_KMS("hdmi device is null.\n");
		return -EFAULT;
	}

	if (!pd->mixer_dev) {
		DRM_DEBUG_KMS("mixer device is null.\n");
		return -EFAULT;
	}

	ret = platform_driver_register(&hdmi_driver);
	if (ret) {
		DRM_DEBUG_KMS("failed to register hdmi driver.\n");
		return ret;
	}

	ret = platform_driver_register(&mixer_driver);
	if (ret) {
		DRM_DEBUG_KMS("failed to register mixer driver.\n");
		goto err_hdmidrv;
	}

	ctx = get_ctx_from_subdrv(subdrv);

	ctx->hdmi_ctx = (struct exynos_drm_hdmi_context *)
				to_context(pd->hdmi_dev);
	if (!ctx->hdmi_ctx) {
		DRM_DEBUG_KMS("hdmi context is null.\n");
		ret = -EFAULT;
		goto err_mixerdrv;
	}

	ctx->hdmi_ctx->drm_dev = drm_dev;

	ctx->mixer_ctx = (struct exynos_drm_hdmi_context *)
				to_context(pd->mixer_dev);
	if (!ctx->mixer_ctx) {
		DRM_DEBUG_KMS("mixer context is null.\n");
		ret = -EFAULT;
		goto err_mixerdrv;
	}

	ctx->mixer_ctx->drm_dev = drm_dev;

	return 0;

err_mixerdrv:
	platform_driver_unregister(&mixer_driver);
err_hdmidrv:
	platform_driver_unregister(&hdmi_driver);
	return ret;
}

static void hdmi_subdrv_remove(struct drm_device *drm_dev)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	platform_driver_unregister(&hdmi_driver);
	platform_driver_unregister(&mixer_driver);
}

static void exynos_drm_hdmi_late_probe(struct work_struct *work)
{
	struct drm_hdmi_context *ctx = container_of(work,
				struct drm_hdmi_context, work);

	/*
	 * this function calls subdrv->probe() so this must be called
	 * after probe context.
	 *
	 * PS. subdrv->probe() will call platform_driver_register() to probe
	 * hdmi and mixer driver.
	 */
	exynos_drm_subdrv_register(&ctx->subdrv);
}

static int __devinit exynos_drm_hdmi_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct exynos_drm_subdrv *subdrv;
	struct drm_hdmi_context *ctx;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
	if (!ctx) {
		DRM_LOG_KMS("failed to alloc common hdmi context.\n");
		return -ENOMEM;
	}

	subdrv = &ctx->subdrv;

	subdrv->probe = hdmi_subdrv_probe;
	subdrv->remove = hdmi_subdrv_remove;
	subdrv->manager.pipe = -1;
	subdrv->manager.ops = &drm_hdmi_manager_ops;
	subdrv->manager.overlay_ops = &drm_hdmi_overlay_ops;
	subdrv->manager.display_ops = &drm_hdmi_display_ops;
	subdrv->manager.dev = dev;

	platform_set_drvdata(pdev, subdrv);

	INIT_WORK(&ctx->work, exynos_drm_hdmi_late_probe);

	schedule_work(&ctx->work);

	return 0;
}

static int hdmi_runtime_suspend(struct device *dev)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	return 0;
}

static int hdmi_runtime_resume(struct device *dev)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	return 0;
}

static const struct dev_pm_ops hdmi_pm_ops = {
	.runtime_suspend = hdmi_runtime_suspend,
	.runtime_resume	 = hdmi_runtime_resume,
};

static int __devexit exynos_drm_hdmi_remove(struct platform_device *pdev)
{
	struct drm_hdmi_context *ctx = platform_get_drvdata(pdev);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	exynos_drm_subdrv_unregister(&ctx->subdrv);
	kfree(ctx);

	return 0;
}

static struct platform_driver exynos_drm_common_hdmi_driver = {
	.probe		= exynos_drm_hdmi_probe,
	.remove		= __devexit_p(exynos_drm_hdmi_remove),
	.driver		= {
		.name	= "exynos-drm-hdmi",
		.owner	= THIS_MODULE,
		.pm = &hdmi_pm_ops,
	},
};

static int __init exynos_drm_hdmi_init(void)
{
	int ret;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	ret = platform_driver_register(&exynos_drm_common_hdmi_driver);
	if (ret) {
		DRM_DEBUG_KMS("failed to register hdmi common driver.\n");
		return ret;
	}

	return ret;
}

static void __exit exynos_drm_hdmi_exit(void)
{
	platform_driver_unregister(&exynos_drm_common_hdmi_driver);
}

module_init(exynos_drm_hdmi_init);
module_exit(exynos_drm_hdmi_exit);

MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
MODULE_AUTHOR("Seung-Woo Kim, <sw0312.kim@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DRM HDMI Driver");
MODULE_LICENSE("GPL");