/*-
 * Copyright (c) 2015 Michal Meloun
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/malloc.h>

#include <machine/bus.h>

#include <dev/clk/clk.h>
#include <dev/drm2/drmP.h>
#include <dev/drm2/drm_crtc.h>
#include <dev/drm2/drm_crtc_helper.h>
#include <dev/drm2/drm_edid.h>
#include <dev/drm2/drm_fb_helper.h>
#include <dev/gpio/gpiobusvar.h>
#include <dev/ofw/ofw_bus_subr.h>

#include <arm/nvidia/drm2/tegra_drm.h>

#include <dt-bindings/gpio/gpio.h>

int
tegra_drm_connector_get_modes(struct drm_connector *connector)
{
        struct tegra_drm_encoder *output;
        struct edid *edid = NULL;
        int rv;

        output = container_of(connector, struct tegra_drm_encoder,
             connector);

        /* Panel is first */
        if (output->panel != NULL) {
                /* XXX panel parsing */
                return (0);
        }

        /* static EDID is second*/
        edid = output->edid;

        /* EDID from monitor is last */
        if (edid == NULL)
                edid = drm_get_edid(connector, output->ddc);

        if (edid == NULL)
                return (0);

        /* Process EDID */
        drm_mode_connector_update_edid_property(connector, edid);
        rv = drm_add_edid_modes(connector, edid);
        drm_edid_to_eld(connector, edid);
        return (rv);
}

struct drm_encoder *
tegra_drm_connector_best_encoder(struct drm_connector *connector)
{
        struct tegra_drm_encoder *output;

        output = container_of(connector, struct tegra_drm_encoder,
             connector);

        return &(output->encoder);
}

enum drm_connector_status
tegra_drm_connector_detect(struct drm_connector *connector, bool force)
{
        struct tegra_drm_encoder *output;
        bool active;
        int rv;

        output = container_of(connector, struct tegra_drm_encoder,
             connector);
        if (output->gpio_hpd == NULL) {
                return ((output->panel != NULL) ?
                    connector_status_connected:
                    connector_status_disconnected);
        }

        rv = gpio_pin_is_active(output->gpio_hpd, &active);
        if (rv  != 0) {
                device_printf(output->dev, " GPIO read failed: %d\n", rv);
                return (connector_status_unknown);
        }

        return (active ?
            connector_status_connected : connector_status_disconnected);
}

int
tegra_drm_encoder_attach(struct tegra_drm_encoder *output, phandle_t node)
{
        int rv;
        phandle_t ddc;

        /* XXX parse output panel here */

        rv = OF_getencprop_alloc(node, "nvidia,edid",
            (void **)&output->edid);

        /* EDID exist but have invalid size */
        if ((rv >= 0) && (rv != sizeof(struct edid))) {
                device_printf(output->dev,
                    "Malformed \"nvidia,edid\" property\n");
                if (output->edid != NULL)
                        free(output->edid, M_OFWPROP);
                return (ENXIO);
        }

        gpio_pin_get_by_ofw_property(output->dev, node, "nvidia,hpd-gpio",
            &output->gpio_hpd);
        ddc = 0;
        OF_getencprop(node, "nvidia,ddc-i2c-bus", &ddc, sizeof(ddc));
        if (ddc > 0)
                output->ddc = OF_device_from_xref(ddc);
        if ((output->edid == NULL) && (output->ddc == NULL))
                return (ENXIO);

        if (output->gpio_hpd != NULL) {
                output->connector.polled =
//                  DRM_CONNECTOR_POLL_HPD;
                    DRM_CONNECTOR_POLL_DISCONNECT |
                    DRM_CONNECTOR_POLL_CONNECT;
        }

        return (0);
}

int tegra_drm_encoder_init(struct tegra_drm_encoder *output,
    struct tegra_drm *drm)
{

        if (output->panel) {
                /* attach panel */
        }
        return (0);
}

int tegra_drm_encoder_exit(struct tegra_drm_encoder *output,
    struct tegra_drm *drm)
{

        if (output->panel) {
                /* detach panel */
        }
        return (0);
}