// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Avionic Design GmbH
 * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
 */

#include <drm/drm_atomic_helper.h>
#include <drm/drm_panel.h>
#include <drm/drm_simple_kms_helper.h>

#include "drm.h"
#include "dc.h"

#include <media/cec-notifier.h>

int tegra_output_connector_get_modes(struct drm_connector *connector)
{
        struct tegra_output *output = connector_to_output(connector);
        struct edid *edid = NULL;
        int err = 0;

        /*
         * If the panel provides one or more modes, use them exclusively and
         * ignore any other means of obtaining a mode.
         */
        if (output->panel) {
                err = drm_panel_get_modes(output->panel, connector);
                if (err > 0)
                        return err;
        }

        if (output->edid)
                edid = kmemdup(output->edid, sizeof(*edid), GFP_KERNEL);
        else if (output->ddc)
                edid = drm_get_edid(connector, output->ddc);

        cec_notifier_set_phys_addr_from_edid(output->cec, edid);
        drm_connector_update_edid_property(connector, edid);

        if (edid) {
                err = drm_add_edid_modes(connector, edid);
                kfree(edid);
        }

        return err;
}

enum drm_connector_status
tegra_output_connector_detect(struct drm_connector *connector, bool force)
{
        struct tegra_output *output = connector_to_output(connector);
        enum drm_connector_status status = connector_status_unknown;

        if (output->hpd_gpio) {
                if (gpiod_get_value(output->hpd_gpio) == 0)
                        status = connector_status_disconnected;
                else
                        status = connector_status_connected;
        } else {
                if (!output->panel)
                        status = connector_status_disconnected;
                else
                        status = connector_status_connected;
        }

        if (status != connector_status_connected)
                cec_notifier_phys_addr_invalidate(output->cec);

        return status;
}

void tegra_output_connector_destroy(struct drm_connector *connector)
{
        struct tegra_output *output = connector_to_output(connector);

        if (output->cec)
                cec_notifier_conn_unregister(output->cec);

        drm_connector_unregister(connector);
        drm_connector_cleanup(connector);
}

static irqreturn_t hpd_irq(int irq, void *data)
{
        struct tegra_output *output = data;

        if (output->connector.dev)
                drm_helper_hpd_irq_event(output->connector.dev);

        return IRQ_HANDLED;
}

int tegra_output_probe(struct tegra_output *output)
{
        struct device_node *ddc, *panel;
        unsigned long flags;
        int err, size;

        if (!output->of_node)
                output->of_node = output->dev->of_node;

        panel = of_parse_phandle(output->of_node, "nvidia,panel", 0);
        if (panel) {
                output->panel = of_drm_find_panel(panel);
                if (IS_ERR(output->panel))
                        return PTR_ERR(output->panel);

                of_node_put(panel);
        }

        output->edid = of_get_property(output->of_node, "nvidia,edid", &size);

        ddc = of_parse_phandle(output->of_node, "nvidia,ddc-i2c-bus", 0);
        if (ddc) {
                output->ddc = of_find_i2c_adapter_by_node(ddc);
                if (!output->ddc) {
                        err = -EPROBE_DEFER;
                        of_node_put(ddc);
                        return err;
                }

                of_node_put(ddc);
        }

        output->hpd_gpio = devm_gpiod_get_from_of_node(output->dev,
                                                       output->of_node,
                                                       "nvidia,hpd-gpio", 0,
                                                       GPIOD_IN,
                                                       "HDMI hotplug detect");
        if (IS_ERR(output->hpd_gpio)) {
                if (PTR_ERR(output->hpd_gpio) != -ENOENT)
                        return PTR_ERR(output->hpd_gpio);

                output->hpd_gpio = NULL;
        }

        if (output->hpd_gpio) {
                err = gpiod_to_irq(output->hpd_gpio);
                if (err < 0) {
                        dev_err(output->dev, "gpiod_to_irq(): %d\n", err);
                        return err;
                }

                output->hpd_irq = err;

                flags = IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
                        IRQF_ONESHOT;

                err = request_threaded_irq(output->hpd_irq, NULL, hpd_irq,
                                           flags, "hpd", output);
                if (err < 0) {
                        dev_err(output->dev, "failed to request IRQ#%u: %d\n",
                                output->hpd_irq, err);
                        return err;
                }

                output->connector.polled = DRM_CONNECTOR_POLL_HPD;

                /*
                 * Disable the interrupt until the connector has been
                 * initialized to avoid a race in the hotplug interrupt
                 * handler.
                 */
                disable_irq(output->hpd_irq);
        }

        return 0;
}

void tegra_output_remove(struct tegra_output *output)
{
        if (output->hpd_gpio)
                free_irq(output->hpd_irq, output);

        if (output->ddc)
                put_device(&output->ddc->dev);
}

int tegra_output_init(struct drm_device *drm, struct tegra_output *output)
{
        int connector_type;
        int err;

        if (output->panel) {
                err = drm_panel_attach(output->panel, &output->connector);
                if (err < 0)
                        return err;
        }

        /*
         * The connector is now registered and ready to receive hotplug events
         * so the hotplug interrupt can be enabled.
         */
        if (output->hpd_gpio)
                enable_irq(output->hpd_irq);

        connector_type = output->connector.connector_type;
        /*
         * Create a CEC notifier for HDMI connector.
         */
        if (connector_type == DRM_MODE_CONNECTOR_HDMIA ||
            connector_type == DRM_MODE_CONNECTOR_HDMIB) {
                struct cec_connector_info conn_info;

                cec_fill_conn_info_from_drm(&conn_info, &output->connector);
                output->cec = cec_notifier_conn_register(output->dev, NULL,
                                                         &conn_info);
                if (!output->cec)
                        return -ENOMEM;
        }

        return 0;
}

void tegra_output_exit(struct tegra_output *output)
{
        /*
         * The connector is going away, so the interrupt must be disabled to
         * prevent the hotplug interrupt handler from potentially crashing.
         */
        if (output->hpd_gpio)
                disable_irq(output->hpd_irq);

        if (output->panel)
                drm_panel_detach(output->panel);
}

void tegra_output_find_possible_crtcs(struct tegra_output *output,
                                      struct drm_device *drm)
{
        struct device *dev = output->dev;
        struct drm_crtc *crtc;
        unsigned int mask = 0;

        drm_for_each_crtc(crtc, drm) {
                struct tegra_dc *dc = to_tegra_dc(crtc);

                if (tegra_dc_has_output(dc, dev))
                        mask |= drm_crtc_mask(crtc);
        }

        if (mask == 0) {
                dev_warn(dev, "missing output definition for heads in DT\n");
                mask = 0x3;
        }

        output->encoder.possible_crtcs = mask;
}

int tegra_output_suspend(struct tegra_output *output)
{
        if (output->hpd_irq)
                disable_irq(output->hpd_irq);

        return 0;
}

int tegra_output_resume(struct tegra_output *output)
{
        if (output->hpd_irq)
                enable_irq(output->hpd_irq);

        return 0;
}