// SPDX-License-Identifier: GPL-2.0-or-later
/* Hisilicon Hibmc SoC drm driver
 *
 * Based on the bochs drm driver.
 *
 * Copyright (c) 2016 Huawei Limited.
 *
 * Author:
 *      Rongrong Zou <zourongrong@huawei.com>
 *      Rongrong Zou <zourongrong@gmail.com>
 *      Jianhua Li <lijianhua@huawei.com>
 */

#include <linux/io.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_print.h>
#include <drm/drm_simple_kms_helper.h>

#include "hibmc_drm_drv.h"
#include "hibmc_drm_regs.h"

static int hibmc_connector_get_modes(struct drm_connector *connector)
{
        struct drm_mode_config *mode_config = &connector->dev->mode_config;
        struct hibmc_vdac *vdac = to_hibmc_vdac(connector);
        int count;

        if (vdac->phys_status == connector_status_connected) {
                count = drm_connector_helper_get_modes(connector);
        } else {
                drm_edid_connector_update(connector, NULL);
                count = drm_add_modes_noedid(connector,
                                             mode_config->max_width,
                                             mode_config->max_height);
                if (count)
                        drm_set_preferred_mode(connector, 1024, 768);
        }

        return count;
}

static void hibmc_connector_destroy(struct drm_connector *connector)
{
        struct hibmc_vdac *vdac = to_hibmc_vdac(connector);

        hibmc_ddc_del(vdac);
        drm_connector_cleanup(connector);
}

static int hibmc_vdac_detect(struct drm_connector *connector,
                             struct drm_modeset_acquire_ctx *ctx,
                             bool force)
{
        struct hibmc_drm_private *priv = to_hibmc_drm_private(connector->dev);
        int status = drm_connector_helper_detect_from_ddc(connector, ctx,
                                                         force);
        struct hibmc_vdac *vdac = to_hibmc_vdac(connector);

        if (priv->dp.phys_status == connector_status_connected) {
                vdac->phys_status = status;
                return status;
        }

        if (status != vdac->phys_status)
                ++connector->epoch_counter;
        vdac->phys_status = status;

        /* When both the DP and VDAC physical status are disconnected,
         * the "connected" status is returned to support KVM display.
         */
        return connector_status_connected;
}

static const struct drm_connector_helper_funcs
        hibmc_connector_helper_funcs = {
        .get_modes = hibmc_connector_get_modes,
        .detect_ctx = hibmc_vdac_detect,
};

static const struct drm_connector_funcs hibmc_connector_funcs = {
        .fill_modes = drm_helper_probe_single_connector_modes,
        .destroy = hibmc_connector_destroy,
        .reset = drm_atomic_helper_connector_reset,
        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};

int hibmc_vdac_init(struct hibmc_drm_private *priv)
{
        struct drm_device *dev = &priv->dev;
        struct hibmc_vdac *vdac = &priv->vdac;
        struct drm_encoder *encoder = &vdac->encoder;
        struct drm_crtc *crtc = &priv->crtc;
        struct drm_connector *connector = &vdac->connector;
        int ret;

        ret = hibmc_ddc_create(dev, vdac);
        if (ret) {
                drm_err(dev, "failed to create ddc: %d\n", ret);
                return ret;
        }

        encoder->possible_crtcs = drm_crtc_mask(crtc);
        ret = drmm_encoder_init(dev, encoder, NULL, DRM_MODE_ENCODER_DAC, NULL);
        if (ret) {
                drm_err(dev, "failed to init encoder: %d\n", ret);
                goto err;
        }

        ret = drm_connector_init_with_ddc(dev, connector,
                                          &hibmc_connector_funcs,
                                          DRM_MODE_CONNECTOR_VGA,
                                          &vdac->adapter);
        if (ret) {
                drm_err(dev, "failed to init connector: %d\n", ret);
                goto err;
        }

        drm_connector_helper_add(connector, &hibmc_connector_helper_funcs);

        drm_connector_attach_encoder(connector, encoder);

        connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;

        vdac->phys_status = connector_status_disconnected;

        return 0;

err:
        hibmc_ddc_del(vdac);

        return ret;
}