// SPDX-License-Identifier: GPL-2.0 OR MIT

/*
 *  Xen para-virtual DRM device
 *
 * Copyright (C) 2016-2018 EPAM Systems Inc.
 *
 * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
 */

#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_probe_helper.h>

#include <video/videomode.h>

#include "xen_drm_front.h"
#include "xen_drm_front_conn.h"
#include "xen_drm_front_kms.h"

static struct xen_drm_front_drm_pipeline *
to_xen_drm_pipeline(struct drm_connector *connector)
{
        return container_of(connector, struct xen_drm_front_drm_pipeline, conn);
}

static const u32 plane_formats[] = {
        DRM_FORMAT_RGB565,
        DRM_FORMAT_RGB888,
        DRM_FORMAT_XRGB8888,
        DRM_FORMAT_ARGB8888,
        DRM_FORMAT_XRGB4444,
        DRM_FORMAT_ARGB4444,
        DRM_FORMAT_XRGB1555,
        DRM_FORMAT_ARGB1555,
        DRM_FORMAT_YUYV,
};

const u32 *xen_drm_front_conn_get_formats(int *format_count)
{
        *format_count = ARRAY_SIZE(plane_formats);
        return plane_formats;
}

static int connector_detect(struct drm_connector *connector,
                            struct drm_modeset_acquire_ctx *ctx,
                            bool force)
{
        struct xen_drm_front_drm_pipeline *pipeline =
                        to_xen_drm_pipeline(connector);

        if (drm_dev_is_unplugged(connector->dev))
                pipeline->conn_connected = false;

        return pipeline->conn_connected ? connector_status_connected :
                        connector_status_disconnected;
}

#define XEN_DRM_CRTC_VREFRESH_HZ        60

static int connector_get_modes(struct drm_connector *connector)
{
        struct xen_drm_front_drm_pipeline *pipeline =
                        to_xen_drm_pipeline(connector);
        struct drm_display_mode *mode;
        struct videomode videomode;
        int width, height;

        mode = drm_mode_create(connector->dev);
        if (!mode)
                return 0;

        memset(&videomode, 0, sizeof(videomode));
        videomode.hactive = pipeline->width;
        videomode.vactive = pipeline->height;
        width = videomode.hactive + videomode.hfront_porch +
                        videomode.hback_porch + videomode.hsync_len;
        height = videomode.vactive + videomode.vfront_porch +
                        videomode.vback_porch + videomode.vsync_len;
        videomode.pixelclock = width * height * XEN_DRM_CRTC_VREFRESH_HZ;
        mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;

        drm_display_mode_from_videomode(&videomode, mode);
        drm_mode_probed_add(connector, mode);
        return 1;
}

static const struct drm_connector_helper_funcs connector_helper_funcs = {
        .get_modes = connector_get_modes,
        .detect_ctx = connector_detect,
};

static const struct drm_connector_funcs connector_funcs = {
        .fill_modes = drm_helper_probe_single_connector_modes,
        .destroy = drm_connector_cleanup,
        .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 xen_drm_front_conn_init(struct xen_drm_front_drm_info *drm_info,
                            struct drm_connector *connector)
{
        struct xen_drm_front_drm_pipeline *pipeline =
                        to_xen_drm_pipeline(connector);

        drm_connector_helper_add(connector, &connector_helper_funcs);

        pipeline->conn_connected = true;

        connector->polled = DRM_CONNECTOR_POLL_CONNECT |
                        DRM_CONNECTOR_POLL_DISCONNECT;

        return drm_connector_init(drm_info->drm_dev, connector,
                                  &connector_funcs, DRM_MODE_CONNECTOR_VIRTUAL);
}