/** @file $Id: vboxvideo_crtc.c 39335 2011-11-16 15:37:26Z vboxsync $
 *
 * VirtualBox Additions Linux kernel video driver, KMS support
 */

/*
 * Copyright (C) 2011 Oracle Corporation
 *
 * This file is part of VirtualBox Open Source Edition (OSE), as
 * available from http://www.virtualbox.org. This file is free software;
 * you can redistribute it and/or modify it under the terms of the GNU
 * General Public License (GPL) as published by the Free Software
 * Foundation, in version 2 as it comes in the "COPYING" file of the
 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
 * --------------------------------------------------------------------
 *
 * This code is based on
 * glint_crtc.c
 * with the following copyright and permission notice:
 *
 * Copyright 2010 Matt Turner.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Matt Turner
 */

#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33)

#include <VBox/VBoxVideoGuest.h>

#include "vboxvideo_drv.h"

#include "drm/drm_crtc_helper.h"

static void vboxvideo_crtc_dpms(struct drm_crtc *crtc, int mode)
{
    struct vboxvideo_crtc *vboxvideo_crtc = to_vboxvideo_crtc(crtc);
    struct drm_device *dev = crtc->dev;
    struct vboxvideo_device *gdev = dev->dev_private;

    if (mode == vboxvideo_crtc->last_dpms) /* Don't do unnecesary mode changes. */
        return;

    vboxvideo_crtc->last_dpms = mode;

    switch (mode) {
    case DRM_MODE_DPMS_STANDBY:
    case DRM_MODE_DPMS_SUSPEND:
    case DRM_MODE_DPMS_OFF:
        vboxvideo_crtc->enabled = false;
        break;
    case DRM_MODE_DPMS_ON:
        vboxvideo_crtc->enabled = true;
        break;
    }
}

static bool vboxvideo_crtc_mode_fixup(struct drm_crtc *crtc,
                  struct drm_display_mode *mode,
                  struct drm_display_mode *adjusted_mode)
{
    return true;
}

static int vboxvideo_crtc_mode_set(struct drm_crtc *crtc,
                                   struct drm_display_mode *mode,
                                   struct drm_display_mode *adjusted_mode,
                                   int x, int y, struct drm_framebuffer *old_fb)
{
    /*
    struct vboxvideo_crtc *vboxvideo_crtc = to_vboxvideo_crtc(crtc);

    vboxvideo_crtc_set_base(crtc, x, y, old_fb);
    vboxvideo_set_crtc_timing(crtc, adjusted_mode);
    vboxvideo_set_pll(crtc, adjusted_mode);
    */
    return 0;
}

static void vboxvideo_crtc_prepare(struct drm_crtc *crtc)
{
    struct drm_device *dev = crtc->dev;
    struct drm_crtc *crtci;

    /*
    list_for_each_entry(crtci, &dev->mode_config.crtc_list, head)
        vboxvideo_crtc_dpms(crtci, DRM_MODE_DPMS_OFF);
    */
}

static void vboxvideo_crtc_commit(struct drm_crtc *crtc)
{
    struct drm_device *dev = crtc->dev;
    struct drm_crtc *crtci;

    /*
    list_for_each_entry(crtci, &dev->mode_config.crtc_list, head) {
        if (crtci->enabled)
            vboxvideo_crtc_dpms(crtci, DRM_MODE_DPMS_ON);
    }
    */
}

static void vboxvideo_crtc_load_lut(struct drm_crtc *crtc)
{
    /* Dummy */
}

static void vboxvideo_crtc_gamma_set(struct drm_crtc *crtc, u16 *red,
                                     u16 *green, u16 *blue, uint32_t size)
{
    /* Dummy */
}

static void vboxvideo_crtc_destroy(struct drm_crtc *crtc)
{
    struct vboxvideo_crtc *vboxvideo_crtc = to_vboxvideo_crtc(crtc);

    drm_crtc_cleanup(crtc);
    kfree(vboxvideo_crtc);
}

static const struct drm_crtc_funcs vboxvideo_crtc_funcs = {
    /*
    .cursor_set = vboxvideo_crtc_cursor_set,
    .cursor_move = vboxvideo_crtc_cursor_move,
    */
    .cursor_set = NULL,
    .cursor_move = NULL,
    .gamma_set = vboxvideo_crtc_gamma_set,
    .set_config = drm_crtc_helper_set_config,
    .destroy = vboxvideo_crtc_destroy,
};

static const struct drm_crtc_helper_funcs vboxvideo_helper_funcs = {
    .dpms = vboxvideo_crtc_dpms,
    .mode_fixup = vboxvideo_crtc_mode_fixup,
    .mode_set = vboxvideo_crtc_mode_set,
    /*
    .mode_set_base = vboxvideo_crtc_set_base,
    */
    .prepare = vboxvideo_crtc_prepare,
    .commit = vboxvideo_crtc_commit,
    .load_lut = vboxvideo_crtc_load_lut,
};

void vboxvideo_crtc_init(struct drm_device *dev, int index)
{
    struct vboxvideo_device *gdev = dev->dev_private;
    struct vboxvideo_crtc *vboxvideo_crtc;
    int i;

    vboxvideo_crtc = kzalloc(  sizeof(struct vboxvideo_crtc)
                             + (VBOXVIDEOFB_CONN_LIMIT
                                * sizeof(struct drm_connector *)),
                             GFP_KERNEL);
    if (vboxvideo_crtc == NULL)
        return;

    drm_crtc_init(dev, &vboxvideo_crtc->base, &vboxvideo_crtc_funcs);

    vboxvideo_crtc->crtc_id = index;
    vboxvideo_crtc->last_dpms = VBOXVIDEO_DPMS_CLEARED;
    gdev->mode_info.crtcs[index] = vboxvideo_crtc;

    drm_crtc_helper_add(&vboxvideo_crtc->base, &vboxvideo_helper_funcs);
}

#endif /* LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27) */