/*	$NetBSD: xen_drm_front_conn.c,v 1.2 2021/12/18 23:45:45 riastradh Exp $	*/

// 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: xen_drm_front_conn.c,v 1.2 2021/12/18 23:45:45 riastradh Exp $");

#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.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,
};

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);
}