/* $NetBSD: fdt_panel.c,v 1.6 2021/12/19 11:01:10 riastradh Exp $ */

/*-
 * Copyright (c) 2019 Jonathan A. Kollasch <jakllsch@kollasch.net>
 * 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 ``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 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fdt_panel.c,v 1.6 2021/12/19 11:01:10 riastradh Exp $");

#include <sys/param.h>
#include <sys/bus.h>
#include <sys/device.h>
#include <sys/gpio.h>
#include <sys/systm.h>

#include <dev/fdt/fdt_port.h>
#include <dev/fdt/fdtvar.h>

#include <dev/i2c/ddcvar.h>

#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_panel.h>

static const struct device_compatible_entry compat_data[] = {
        { .compat = "simple-panel" },
        { .compat = "boe,nv140fhmn49" },
        DEVICE_COMPAT_EOL
};

struct panel_fdt_softc {
        device_t                        sc_dev;
        struct fdt_device_ports         sc_ports;
        struct drm_panel                sc_panel;
        struct fdtbus_gpio_pin *        sc_enable;
        struct fdtbus_regulator *       sc_regulator;
};

#define to_panel_fdt(x) container_of(x, struct panel_fdt_softc, sc_panel)

static int
panel_fdt_enable(struct drm_panel * panel)
{
        struct panel_fdt_softc * const sc = to_panel_fdt(panel);

        if (sc->sc_enable) {
                fdtbus_gpio_write(sc->sc_enable, true);
        }

        if (!cold)
                kpause("panele", false, mstohz(200), NULL);

        return 0;
}

static int
panel_fdt_prepare(struct drm_panel * panel)
{
        struct panel_fdt_softc * const sc = to_panel_fdt(panel);

        if (sc->sc_regulator) {
                fdtbus_regulator_enable(sc->sc_regulator);
        }

        if (cold)
                delay(210000);
        else
                kpause("panelp", false, mstohz(210), NULL);

        return 0;
}

static const struct drm_panel_funcs panel_fdt_funcs = {
        .disable = NULL,
        .enable = panel_fdt_enable,
        .get_modes = NULL,
        .get_timings = NULL,
        .prepare = panel_fdt_prepare,
        .unprepare = NULL,
};

static int
panel_fdt_ep_activate(device_t dev, struct fdt_endpoint *ep, bool activate)
{
        struct fdt_endpoint *rep = fdt_endpoint_remote(ep);

        if (fdt_endpoint_port_index(ep) != 0)
                return EINVAL;

        if (fdt_endpoint_type(rep) != EP_DRM_ENCODER)
                return EINVAL;

        return 0;
}

static void *
panel_fdt_ep_get_data(device_t dev, struct fdt_endpoint *ep)
{
        struct panel_fdt_softc * const sc = device_private(dev);

        return &sc->sc_panel;
}

static int
panel_fdt_match(device_t parent, cfdata_t cf, void *aux)
{
        struct fdt_attach_args * const faa = aux;

        return of_compatible_match(faa->faa_phandle, compat_data);
}

static void
panel_fdt_attach(device_t parent, device_t self, void *aux)
{
        struct panel_fdt_softc * const sc = device_private(self);
        struct fdt_attach_args * const faa = aux;
        const int phandle = faa->faa_phandle;

        aprint_naive("\n");
        aprint_normal(": panel\n");

        sc->sc_dev = self;

        /* required for "simple-panel" */
        sc->sc_regulator = fdtbus_regulator_acquire(phandle, "power-supply");
        if (sc->sc_regulator == NULL) {
                aprint_error_dev(self, "regulator not found\n");
                return;
        }

        /* optional for "simple-panel" */
        sc->sc_enable = fdtbus_gpio_acquire_index(phandle,
            "enable-gpios", 0, GPIO_PIN_OUTPUT);

        sc->sc_ports.dp_ep_activate = panel_fdt_ep_activate;
        sc->sc_ports.dp_ep_get_data = panel_fdt_ep_get_data;
        fdt_ports_register(&sc->sc_ports, self, phandle, EP_DRM_PANEL);

        drm_panel_init(&sc->sc_panel, self, &panel_fdt_funcs, DRM_MODE_CONNECTOR_DPI);
        sc->sc_panel.funcs = &panel_fdt_funcs;

        drm_panel_add(&sc->sc_panel);
}

CFATTACH_DECL_NEW(panel_fdt, sizeof(struct panel_fdt_softc),
        panel_fdt_match, panel_fdt_attach, NULL, NULL);