// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2015 Texas Instruments
 * Author: Jyri Sarha <jsarha@ti.com>
 */

#include <linux/component.h>
#include <linux/of_graph.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_of.h>
#include <drm/drm_simple_kms_helper.h>

#include "tilcdc_drv.h"
#include "tilcdc_external.h"

static const struct tilcdc_panel_info panel_info_tda998x = {
                .ac_bias                = 255,
                .ac_bias_intrpt         = 0,
                .dma_burst_sz           = 16,
                .bpp                    = 16,
                .fdd                    = 0x80,
                .tft_alt_mode           = 0,
                .invert_pxl_clk         = 1,
                .sync_edge              = 1,
                .sync_ctrl              = 1,
                .raster_order           = 0,
};

static const struct tilcdc_panel_info panel_info_default = {
                .ac_bias                = 255,
                .ac_bias_intrpt         = 0,
                .dma_burst_sz           = 16,
                .bpp                    = 16,
                .fdd                    = 0x80,
                .tft_alt_mode           = 0,
                .sync_edge              = 0,
                .sync_ctrl              = 1,
                .raster_order           = 0,
};

static
struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
                                                    struct drm_encoder *encoder)
{
        struct drm_connector *connector;

        list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
                if (drm_connector_has_possible_encoder(connector, encoder))
                        return connector;
        }

        dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
                encoder->name, encoder->base.id);

        return NULL;
}

int tilcdc_add_component_encoder(struct drm_device *ddev)
{
        struct tilcdc_drm_private *priv = ddev->dev_private;
        struct drm_encoder *encoder = NULL, *iter;

        list_for_each_entry(iter, &ddev->mode_config.encoder_list, head)
                if (iter->possible_crtcs & (1 << priv->crtc->index)) {
                        encoder = iter;
                        break;
                }

        if (!encoder) {
                dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
                return -ENODEV;
        }

        priv->external_connector =
                tilcdc_encoder_find_connector(ddev, encoder);

        if (!priv->external_connector)
                return -ENODEV;

        /* Only tda998x is supported at the moment. */
        tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
        tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);

        return 0;
}

static
int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
{
        struct tilcdc_drm_private *priv = ddev->dev_private;
        int ret;

        priv->external_encoder->possible_crtcs = BIT(0);

        ret = drm_bridge_attach(priv->external_encoder, bridge, NULL, 0);
        if (ret)
                return ret;

        tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);

        priv->external_connector =
                tilcdc_encoder_find_connector(ddev, priv->external_encoder);
        if (!priv->external_connector)
                return -ENODEV;

        return 0;
}

int tilcdc_attach_external_device(struct drm_device *ddev)
{
        struct tilcdc_drm_private *priv = ddev->dev_private;
        struct drm_bridge *bridge;
        struct drm_panel *panel;
        int ret;

        ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
                                          &panel, &bridge);
        if (ret == -ENODEV)
                return 0;
        else if (ret)
                return ret;

        priv->external_encoder = devm_kzalloc(ddev->dev,
                                              sizeof(*priv->external_encoder),
                                              GFP_KERNEL);
        if (!priv->external_encoder)
                return -ENOMEM;

        ret = drm_simple_encoder_init(ddev, priv->external_encoder,
                                      DRM_MODE_ENCODER_NONE);
        if (ret) {
                dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
                return ret;
        }

        if (panel) {
                bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel,
                                                         DRM_MODE_CONNECTOR_DPI);
                if (IS_ERR(bridge)) {
                        ret = PTR_ERR(bridge);
                        goto err_encoder_cleanup;
                }
        }

        ret = tilcdc_attach_bridge(ddev, bridge);
        if (ret)
                goto err_encoder_cleanup;

        return 0;

err_encoder_cleanup:
        drm_encoder_cleanup(priv->external_encoder);
        return ret;
}

static int dev_match_of(struct device *dev, void *data)
{
        return dev->of_node == data;
}

int tilcdc_get_external_components(struct device *dev,
                                   struct component_match **match)
{
        struct device_node *node;

        node = of_graph_get_remote_node(dev->of_node, 0, 0);

        if (!of_device_is_compatible(node, "nxp,tda998x")) {
                of_node_put(node);
                return 0;
        }

        if (match)
                drm_of_component_match_add(dev, match, dev_match_of, node);
        of_node_put(node);
        return 1;
}