/* exynos_drm_core.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Author:
 *	Inki Dae <inki.dae@samsung.com>
 *	Joonyoung Shim <jy0922.shim@samsung.com>
 *	Seung-Woo Kim <sw0312.kim@samsung.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
 * VA LINUX SYSTEMS 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.
 */

#include "drmP.h"
#include "exynos_drm_drv.h"
#include "exynos_drm_encoder.h"
#include "exynos_drm_connector.h"
#include "exynos_drm_fbdev.h"

static DEFINE_MUTEX(exynos_drm_mutex);
static LIST_HEAD(exynos_drm_subdrv_list);
static struct drm_device *drm_dev;

static int exynos_drm_subdrv_probe(struct drm_device *dev,
					struct exynos_drm_subdrv *subdrv)
{
	struct drm_encoder *encoder;
	struct drm_connector *connector;

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

	if (subdrv->probe) {
		int ret;

		/*
		 * this probe callback would be called by sub driver
		 * after setting of all resources to this sub driver,
		 * such as clock, irq and register map are done or by load()
		 * of exynos drm driver.
		 *
		 * P.S. note that this driver is considered for modularization.
		 */
		ret = subdrv->probe(dev, subdrv->manager.dev);
		if (ret)
			return ret;
	}

	/* create and initialize a encoder for this sub driver. */
	encoder = exynos_drm_encoder_create(dev, &subdrv->manager,
			(1 << MAX_CRTC) - 1);
	if (!encoder) {
		DRM_ERROR("failed to create encoder\n");
		return -EFAULT;
	}

	/*
	 * create and initialize a connector for this sub driver and
	 * attach the encoder created above to the connector.
	 */
	connector = exynos_drm_connector_create(dev, encoder);
	if (!connector) {
		DRM_ERROR("failed to create connector\n");
		encoder->funcs->destroy(encoder);
		return -EFAULT;
	}

	subdrv->encoder = encoder;
	subdrv->connector = connector;

	return 0;
}

static void exynos_drm_subdrv_remove(struct drm_device *dev,
				      struct exynos_drm_subdrv *subdrv)
{
	DRM_DEBUG_DRIVER("%s\n", __FILE__);

	if (subdrv->remove)
		subdrv->remove(dev);

	if (subdrv->encoder) {
		struct drm_encoder *encoder = subdrv->encoder;
		encoder->funcs->destroy(encoder);
		subdrv->encoder = NULL;
	}

	if (subdrv->connector) {
		struct drm_connector *connector = subdrv->connector;
		connector->funcs->destroy(connector);
		subdrv->connector = NULL;
	}
}

int exynos_drm_device_register(struct drm_device *dev)
{
	struct exynos_drm_subdrv *subdrv, *n;
	int err;

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

	if (!dev)
		return -EINVAL;

	if (drm_dev) {
		DRM_ERROR("Already drm device were registered\n");
		return -EBUSY;
	}

	mutex_lock(&exynos_drm_mutex);
	list_for_each_entry_safe(subdrv, n, &exynos_drm_subdrv_list, list) {
		err = exynos_drm_subdrv_probe(dev, subdrv);
		if (err) {
			DRM_DEBUG("exynos drm subdrv probe failed.\n");
			list_del(&subdrv->list);
		}
	}

	drm_dev = dev;
	mutex_unlock(&exynos_drm_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(exynos_drm_device_register);

int exynos_drm_device_unregister(struct drm_device *dev)
{
	struct exynos_drm_subdrv *subdrv;

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

	if (!dev || dev != drm_dev) {
		WARN(1, "Unexpected drm device unregister!\n");
		return -EINVAL;
	}

	mutex_lock(&exynos_drm_mutex);
	list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list)
		exynos_drm_subdrv_remove(dev, subdrv);

	drm_dev = NULL;
	mutex_unlock(&exynos_drm_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(exynos_drm_device_unregister);

static int exynos_drm_mode_group_reinit(struct drm_device *dev)
{
	struct drm_mode_group *group = &dev->primary->mode_group;
	uint32_t *id_list = group->id_list;
	int ret;

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

	ret = drm_mode_group_init_legacy_group(dev, group);
	if (ret < 0)
		return ret;

	kfree(id_list);
	return 0;
}

int exynos_drm_subdrv_register(struct exynos_drm_subdrv *subdrv)
{
	int err;

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

	if (!subdrv)
		return -EINVAL;

	mutex_lock(&exynos_drm_mutex);
	if (drm_dev) {
		err = exynos_drm_subdrv_probe(drm_dev, subdrv);
		if (err) {
			DRM_ERROR("failed to probe exynos drm subdrv\n");
			mutex_unlock(&exynos_drm_mutex);
			return err;
		}

		/*
		 * if any specific driver such as fimd or hdmi driver called
		 * exynos_drm_subdrv_register() later than drm_load(),
		 * the fb helper should be re-initialized and re-configured.
		 */
		err = exynos_drm_fbdev_reinit(drm_dev);
		if (err) {
			DRM_ERROR("failed to reinitialize exynos drm fbdev\n");
			exynos_drm_subdrv_remove(drm_dev, subdrv);
			mutex_unlock(&exynos_drm_mutex);
			return err;
		}

		err = exynos_drm_mode_group_reinit(drm_dev);
		if (err) {
			DRM_ERROR("failed to reinitialize mode group\n");
			exynos_drm_fbdev_fini(drm_dev);
			exynos_drm_subdrv_remove(drm_dev, subdrv);
			mutex_unlock(&exynos_drm_mutex);
			return err;
		}
	}

	subdrv->drm_dev = drm_dev;

	list_add_tail(&subdrv->list, &exynos_drm_subdrv_list);
	mutex_unlock(&exynos_drm_mutex);

	return 0;
}
EXPORT_SYMBOL_GPL(exynos_drm_subdrv_register);

int exynos_drm_subdrv_unregister(struct exynos_drm_subdrv *subdrv)
{
	int ret = -EFAULT;

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

	if (!subdrv) {
		DRM_DEBUG("Unexpected exynos drm subdrv unregister!\n");
		return ret;
	}

	mutex_lock(&exynos_drm_mutex);
	if (drm_dev) {
		exynos_drm_subdrv_remove(drm_dev, subdrv);
		list_del(&subdrv->list);

		/*
		 * fb helper should be updated once a sub driver is released
		 * to re-configure crtc and connector and also to re-setup
		 * drm framebuffer.
		 */
		ret = exynos_drm_fbdev_reinit(drm_dev);
		if (ret < 0) {
			DRM_ERROR("failed fb helper reinit.\n");
			goto fail;
		}

		ret = exynos_drm_mode_group_reinit(drm_dev);
		if (ret < 0) {
			DRM_ERROR("failed drm mode group reinit.\n");
			goto fail;
		}
	}

fail:
	mutex_unlock(&exynos_drm_mutex);
	return ret;
}
EXPORT_SYMBOL_GPL(exynos_drm_subdrv_unregister);

MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
MODULE_AUTHOR("Seung-Woo Kim <sw0312.kim@samsung.com>");
MODULE_DESCRIPTION("Samsung SoC DRM Core Driver");
MODULE_LICENSE("GPL");