/* $NetBSD: hdmi_connector.c,v 1.4 2021/12/19 11:01:10 riastradh Exp $ */

/*-
* Copyright (c) 2019 Jared McNeill <[email protected]>
* 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: hdmi_connector.c,v 1.4 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_crtc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_edid.h>
#include <drm/drm_probe_helper.h>

static const struct device_compatible_entry compat_data[] = {
       { .compat = "hdmi-connector" },
       DEVICE_COMPAT_EOL
};

struct dispcon_hdmi_connector {
       struct drm_connector            base;
       struct fdtbus_gpio_pin          *hpd;
       i2c_tag_t                       ddc;

       int                             type;   /* DRM_MODE_CONNECTOR_* */
};

struct dispcon_hdmi_softc {
       struct fdt_device_ports         sc_ports;
       struct dispcon_hdmi_connector   sc_connector;
};

#define to_dispcon_hdmi_connector(x)    container_of(x, struct dispcon_hdmi_connector, base)

static enum drm_connector_status
dispcon_hdmi_connector_detect(struct drm_connector *connector, bool force)
{
       struct dispcon_hdmi_connector *hdmi_connector = to_dispcon_hdmi_connector(connector);
       bool con;

       if (hdmi_connector->hpd == NULL) {
               /*
                * No hotplug detect pin available. Assume that we are connected.
                */
               return connector_status_connected;
       }

       /*
        * Read connect status from hotplug detect pin.
        */
       con = fdtbus_gpio_read(hdmi_connector->hpd);
       if (con) {
               return connector_status_connected;
       } else {
               return connector_status_disconnected;
       }
}

static void
dispcon_hdmi_connector_destroy(struct drm_connector *connector)
{
       drm_connector_unregister(connector);
       drm_connector_cleanup(connector);
}

static const struct drm_connector_funcs dispcon_hdmi_connector_funcs = {
       .dpms = drm_helper_connector_dpms,
       .detect = dispcon_hdmi_connector_detect,
       .fill_modes = drm_helper_probe_single_connector_modes,
       .destroy = dispcon_hdmi_connector_destroy,
};

static int
dispcon_hdmi_connector_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode)
{
       return MODE_OK;
}

static int
dispcon_hdmi_connector_get_modes(struct drm_connector *connector)
{
       struct dispcon_hdmi_connector *hdmi_connector = to_dispcon_hdmi_connector(connector);
       char edid[EDID_LENGTH * 4];
       struct edid *pedid = NULL;
       int error, block;

       if (hdmi_connector->ddc != NULL) {
               memset(edid, 0, sizeof(edid));
               for (block = 0; block < 4; block++) {
                       error = ddc_read_edid_block(hdmi_connector->ddc,
                           &edid[block * EDID_LENGTH], EDID_LENGTH, block);
                       if (error)
                               break;
                       if (block == 0) {
                               pedid = (struct edid *)edid;
                               if (edid[0x7e] == 0)
                                       break;
                       }
               }
       }

       drm_connector_update_edid_property(connector, pedid);
       if (pedid == NULL)
               return 0;

       return drm_add_edid_modes(connector, pedid);
}

static const struct drm_connector_helper_funcs dispcon_hdmi_connector_helper_funcs = {
       .mode_valid = dispcon_hdmi_connector_mode_valid,
       .get_modes = dispcon_hdmi_connector_get_modes,
};

static int
dispcon_hdmi_ep_activate(device_t dev, struct fdt_endpoint *ep, bool activate)
{
       struct drm_connector *connector = fdt_endpoint_get_data(ep);
       struct dispcon_hdmi_connector *hdmi_connector = to_dispcon_hdmi_connector(connector);
       struct fdt_endpoint *rep = fdt_endpoint_remote(ep);
       struct drm_encoder *encoder;

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

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

       if (activate) {
               encoder = fdt_endpoint_get_data(rep);

               connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
               connector->interlace_allowed = 0;
               connector->doublescan_allowed = 0;

               drm_connector_init(encoder->dev, connector, &dispcon_hdmi_connector_funcs,
                   hdmi_connector->type);
               drm_connector_helper_add(connector, &dispcon_hdmi_connector_helper_funcs);
               drm_connector_register(connector);
               drm_connector_attach_encoder(connector, encoder);
       }

       return 0;
}

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

       return &sc->sc_connector.base;
}

static int
dispcon_hdmi_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
dispcon_hdmi_attach(device_t parent, device_t self, void *aux)
{
       struct dispcon_hdmi_softc * const sc = device_private(self);
       struct dispcon_hdmi_connector * const hdmi_connector = &sc->sc_connector;
       struct fdt_attach_args * const faa = aux;
       const int phandle = faa->faa_phandle;

       aprint_naive("\n");
       aprint_normal(": HDMI connector\n");

       hdmi_connector->type = DRM_MODE_CONNECTOR_HDMIA;
       hdmi_connector->hpd = fdtbus_gpio_acquire(phandle, "hpd-gpios", GPIO_PIN_INPUT);
       hdmi_connector->ddc = fdtbus_i2c_acquire(phandle, "ddc-i2c-bus");

       sc->sc_ports.dp_ep_activate = dispcon_hdmi_ep_activate;
       sc->sc_ports.dp_ep_get_data = dispcon_hdmi_ep_get_data;
       fdt_ports_register(&sc->sc_ports, self, phandle, EP_DRM_CONNECTOR);
}

CFATTACH_DECL_NEW(dispcon_hdmi, sizeof(struct dispcon_hdmi_softc),
       dispcon_hdmi_match, dispcon_hdmi_attach, NULL, NULL);

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