// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Samsung SoC DP (Display Port) interface driver.
 *
 * Copyright (C) 2012 Samsung Electronics Co., Ltd.
 * Author: Jingoo Han <jg1.han@samsung.com>
 */

#include <linux/clk.h>
#include <linux/component.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>

#include <drm/bridge/analogix_dp.h>
#include <drm/bridge/of-display-mode-bridge.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_bridge_connector.h>
#include <drm/drm_crtc.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/exynos_drm.h>

#include "exynos_drm_crtc.h"

#define to_dp(nm)       container_of(nm, struct exynos_dp_device, nm)

struct exynos_dp_device {
        struct drm_encoder         encoder;
        struct drm_device          *drm_dev;
        struct device              *dev;

        struct analogix_dp_device *adp;
        struct analogix_dp_plat_data plat_data;
};

static int exynos_dp_crtc_clock_enable(struct analogix_dp_plat_data *plat_data,
                                bool enable)
{
        struct exynos_dp_device *dp = to_dp(plat_data);
        struct drm_encoder *encoder = &dp->encoder;

        if (!encoder->crtc)
                return -EPERM;

        exynos_drm_pipe_clk_enable(to_exynos_crtc(encoder->crtc), enable);

        return 0;
}

static int exynos_dp_poweron(struct analogix_dp_plat_data *plat_data)
{
        return exynos_dp_crtc_clock_enable(plat_data, true);
}

static int exynos_dp_poweroff(struct analogix_dp_plat_data *plat_data)
{
        return exynos_dp_crtc_clock_enable(plat_data, false);
}

static void exynos_dp_mode_set(struct drm_encoder *encoder,
                               struct drm_display_mode *mode,
                               struct drm_display_mode *adjusted_mode)
{
}

static void exynos_dp_nop(struct drm_encoder *encoder)
{
        /* do nothing */
}

static const struct drm_encoder_helper_funcs exynos_dp_encoder_helper_funcs = {
        .mode_set = exynos_dp_mode_set,
        .enable = exynos_dp_nop,
        .disable = exynos_dp_nop,
};

static int exynos_dp_bind(struct device *dev, struct device *master, void *data)
{
        struct exynos_dp_device *dp = dev_get_drvdata(dev);
        struct drm_encoder *encoder = &dp->encoder;
        struct drm_device *drm_dev = data;
        struct drm_connector *connector;
        int ret;

        dp->drm_dev = drm_dev;

        drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);

        drm_encoder_helper_add(encoder, &exynos_dp_encoder_helper_funcs);

        ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
        if (ret < 0)
                return ret;

        dp->plat_data.encoder = encoder;

        ret = analogix_dp_bind(dp->adp, dp->drm_dev);
        if (ret) {
                dp->encoder.funcs->destroy(&dp->encoder);
                return ret;
        }

        connector = drm_bridge_connector_init(dp->drm_dev, dp->plat_data.encoder);
        if (IS_ERR(connector)) {
                ret = PTR_ERR(connector);
                dev_err(dp->dev, "Failed to initialize bridge_connector\n");
                return ret;
        }

        return 0;
}

static void exynos_dp_unbind(struct device *dev, struct device *master,
                             void *data)
{
        struct exynos_dp_device *dp = dev_get_drvdata(dev);

        analogix_dp_unbind(dp->adp);
        dp->encoder.funcs->destroy(&dp->encoder);
}

static const struct component_ops exynos_dp_ops = {
        .bind   = exynos_dp_bind,
        .unbind = exynos_dp_unbind,
};

static int exynos_dp_probe(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct device_node *np;
        struct exynos_dp_device *dp;

        dp = devm_kzalloc(&pdev->dev, sizeof(struct exynos_dp_device),
                          GFP_KERNEL);
        if (!dp)
                return -ENOMEM;

        dp->dev = dev;
        /*
         * We just use the drvdata until driver run into component
         * add function, and then we would set drvdata to null, so
         * that analogix dp driver would take charge of the drvdata.
         */
        platform_set_drvdata(pdev, dp);

        /* This is for the backward compatibility. */
        np = of_parse_phandle(dev->of_node, "panel", 0);
        if (np) {
                dp->plat_data.panel = of_drm_find_panel(np);

                of_node_put(np);
                if (IS_ERR(dp->plat_data.panel))
                        return PTR_ERR(dp->plat_data.panel);

                goto out;
        }

        if (of_get_display_timings(dev->of_node)) {
                dp->plat_data.next_bridge = devm_drm_of_display_mode_bridge(dp->dev,
                                                                        dp->dev->of_node,
                                                                        DRM_MODE_CONNECTOR_eDP);
                if (IS_ERR(dp->plat_data.next_bridge))
                        return PTR_ERR(dp->plat_data.next_bridge);
        }

        /* The remote port can be either a panel or a bridge */
        dp->plat_data.dev_type = EXYNOS_DP;
        dp->plat_data.power_on = exynos_dp_poweron;
        dp->plat_data.power_off = exynos_dp_poweroff;
        dp->plat_data.ops = &exynos_dp_ops;

out:
        dp->adp = analogix_dp_probe(dev, &dp->plat_data);
        if (IS_ERR(dp->adp))
                return PTR_ERR(dp->adp);

        if (dp->plat_data.panel || dp->plat_data.next_bridge)
                return component_add(&pdev->dev, &exynos_dp_ops);
        else
                return analogix_dp_finish_probe(dp->adp);
}

static void exynos_dp_remove(struct platform_device *pdev)
{
        component_del(&pdev->dev, &exynos_dp_ops);
}

static int exynos_dp_suspend(struct device *dev)
{
        struct exynos_dp_device *dp = dev_get_drvdata(dev);

        return analogix_dp_suspend(dp->adp);
}

static int exynos_dp_resume(struct device *dev)
{
        struct exynos_dp_device *dp = dev_get_drvdata(dev);

        return analogix_dp_resume(dp->adp);
}

static DEFINE_RUNTIME_DEV_PM_OPS(exynos_dp_pm_ops, exynos_dp_suspend,
                                 exynos_dp_resume, NULL);

static const struct of_device_id exynos_dp_match[] = {
        { .compatible = "samsung,exynos5-dp" },
        {},
};
MODULE_DEVICE_TABLE(of, exynos_dp_match);

struct platform_driver dp_driver = {
        .probe          = exynos_dp_probe,
        .remove         = exynos_dp_remove,
        .driver         = {
                .name   = "exynos-dp",
                .pm     = pm_ptr(&exynos_dp_pm_ops),
                .of_match_table = exynos_dp_match,
        },
};

MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
MODULE_DESCRIPTION("Samsung Specific Analogix-DP Driver Extension");
MODULE_LICENSE("GPL v2");