// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2012 Sascha Hauer, Pengutronix
 *
 * bridge driver for legacy DT bindings, utilizing display-timings node
 *
 * Author: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
 */

#include <linux/export.h>

#include <drm/drm_bridge.h>
#include <drm/drm_modes.h>
#include <drm/drm_probe_helper.h>
#include <drm/bridge/of-display-mode-bridge.h>

#include <video/of_display_timing.h>
#include <video/of_videomode.h>

struct of_display_mode_bridge {
        struct drm_bridge base;

        struct drm_display_mode mode;
        u32 bus_flags;
};

#define to_of_display_mode_bridge(bridge) container_of(bridge, struct of_display_mode_bridge, base)

static int of_display_mode_bridge_attach(struct drm_bridge *bridge,
                                         struct drm_encoder *encoder,
                                         enum drm_bridge_attach_flags flags)
{
        if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
                return -EINVAL;

        return 0;
}

static int of_display_mode_bridge_get_modes(struct drm_bridge *bridge,
                                            struct drm_connector *connector)
{
        struct of_display_mode_bridge *of_bridge = to_of_display_mode_bridge(bridge);
        int ret;

        ret = drm_connector_helper_get_modes_fixed(connector, &of_bridge->mode);
        if (ret)
                return ret;

        connector->display_info.bus_flags = of_bridge->bus_flags;

        return 0;
}

struct drm_bridge_funcs of_display_mode_bridge_funcs = {
        .attach = of_display_mode_bridge_attach,
        .get_modes = of_display_mode_bridge_get_modes,
};

struct drm_bridge *devm_drm_of_display_mode_bridge(struct device *dev,
                                                   struct device_node *np,
                                                   int type)
{
        struct of_display_mode_bridge *of_bridge;
        int ret;

        of_bridge = devm_drm_bridge_alloc(dev, struct of_display_mode_bridge,
                                          base, &of_display_mode_bridge_funcs);
        if (IS_ERR(of_bridge))
                return ERR_CAST(of_bridge);

        ret = of_get_drm_display_mode(np,
                                      &of_bridge->mode,
                                      &of_bridge->bus_flags,
                                      OF_USE_NATIVE_MODE);
        if (ret)
                return ERR_PTR(ret);

        of_bridge->mode.type |= DRM_MODE_TYPE_DRIVER;

        of_bridge->base.of_node = np;
        of_bridge->base.ops = DRM_BRIDGE_OP_MODES;
        of_bridge->base.type = type;

        ret = devm_drm_bridge_add(dev, &of_bridge->base);
        if (ret)
                return ERR_PTR(ret);

        return &of_bridge->base;
}
EXPORT_SYMBOL_GPL(devm_drm_of_display_mode_bridge);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DRM bridge driver for legacy DT bindings");