// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Texas Instruments Ltd
 * Author: Archit Taneja <archit@ti.com>
 */

#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>

#include <video/omapfb_dss.h>

#include "dss.h"

static LIST_HEAD(output_list);
static DEFINE_MUTEX(output_lock);

int omapdss_output_set_device(struct omap_dss_device *out,
                struct omap_dss_device *dssdev)
{
        int r;

        mutex_lock(&output_lock);

        if (out->dst) {
                DSSERR("output already has device %s connected to it\n",
                        out->dst->name);
                r = -EINVAL;
                goto err;
        }

        if (out->output_type != dssdev->type) {
                DSSERR("output type and display type don't match\n");
                r = -EINVAL;
                goto err;
        }

        out->dst = dssdev;
        dssdev->src = out;

        mutex_unlock(&output_lock);

        return 0;
err:
        mutex_unlock(&output_lock);

        return r;
}
EXPORT_SYMBOL(omapdss_output_set_device);

int omapdss_output_unset_device(struct omap_dss_device *out)
{
        int r;

        mutex_lock(&output_lock);

        if (!out->dst) {
                DSSERR("output doesn't have a device connected to it\n");
                r = -EINVAL;
                goto err;
        }

        if (out->dst->state != OMAP_DSS_DISPLAY_DISABLED) {
                DSSERR("device %s is not disabled, cannot unset device\n",
                                out->dst->name);
                r = -EINVAL;
                goto err;
        }

        out->dst->src = NULL;
        out->dst = NULL;

        mutex_unlock(&output_lock);

        return 0;
err:
        mutex_unlock(&output_lock);

        return r;
}
EXPORT_SYMBOL(omapdss_output_unset_device);

int omapdss_register_output(struct omap_dss_device *out)
{
        list_add_tail(&out->list, &output_list);
        return 0;
}
EXPORT_SYMBOL(omapdss_register_output);

void omapdss_unregister_output(struct omap_dss_device *out)
{
        list_del(&out->list);
}
EXPORT_SYMBOL(omapdss_unregister_output);

struct omap_dss_device *omap_dss_get_output(enum omap_dss_output_id id)
{
        struct omap_dss_device *out;

        list_for_each_entry(out, &output_list, list) {
                if (out->id == id)
                        return out;
        }

        return NULL;
}
EXPORT_SYMBOL(omap_dss_get_output);

struct omap_dss_device *omap_dss_find_output(const char *name)
{
        struct omap_dss_device *out;

        list_for_each_entry(out, &output_list, list) {
                if (strcmp(out->name, name) == 0)
                        return omap_dss_get_device(out);
        }

        return NULL;
}
EXPORT_SYMBOL(omap_dss_find_output);

struct omap_dss_device *omap_dss_find_output_by_port_node(struct device_node *port)
{
        struct device_node *src_node;
        struct omap_dss_device *out;
        u32 reg;

        src_node = dss_of_port_get_parent_device(port);
        if (!src_node)
                return NULL;

        reg = dss_of_port_get_port_number(port);

        list_for_each_entry(out, &output_list, list) {
                if (out->dev->of_node == src_node && out->port_num == reg) {
                        of_node_put(src_node);
                        return omap_dss_get_device(out);
                }
        }

        of_node_put(src_node);

        return NULL;
}
EXPORT_SYMBOL(omap_dss_find_output_by_port_node);

struct omap_dss_device *omapdss_find_output_from_display(struct omap_dss_device *dssdev)
{
        while (dssdev->src)
                dssdev = dssdev->src;

        if (dssdev->id != 0)
                return omap_dss_get_device(dssdev);

        return NULL;
}
EXPORT_SYMBOL(omapdss_find_output_from_display);

struct omap_overlay_manager *omapdss_find_mgr_from_display(struct omap_dss_device *dssdev)
{
        struct omap_dss_device *out;
        struct omap_overlay_manager *mgr;

        out = omapdss_find_output_from_display(dssdev);

        if (out == NULL)
                return NULL;

        mgr = out->manager;

        omap_dss_put_device(out);

        return mgr;
}
EXPORT_SYMBOL(omapdss_find_mgr_from_display);

static const struct dss_mgr_ops *dss_mgr_ops;

int dss_install_mgr_ops(const struct dss_mgr_ops *mgr_ops)
{
        if (dss_mgr_ops)
                return -EBUSY;

        dss_mgr_ops = mgr_ops;

        return 0;
}
EXPORT_SYMBOL(dss_install_mgr_ops);

void dss_uninstall_mgr_ops(void)
{
        dss_mgr_ops = NULL;
}
EXPORT_SYMBOL(dss_uninstall_mgr_ops);

int dss_mgr_connect(struct omap_overlay_manager *mgr,
                struct omap_dss_device *dst)
{
        return dss_mgr_ops->connect(mgr, dst);
}
EXPORT_SYMBOL(dss_mgr_connect);

void dss_mgr_disconnect(struct omap_overlay_manager *mgr,
                struct omap_dss_device *dst)
{
        dss_mgr_ops->disconnect(mgr, dst);
}
EXPORT_SYMBOL(dss_mgr_disconnect);

void dss_mgr_set_timings(struct omap_overlay_manager *mgr,
                const struct omap_video_timings *timings)
{
        dss_mgr_ops->set_timings(mgr, timings);
}
EXPORT_SYMBOL(dss_mgr_set_timings);

void dss_mgr_set_lcd_config(struct omap_overlay_manager *mgr,
                const struct dss_lcd_mgr_config *config)
{
        dss_mgr_ops->set_lcd_config(mgr, config);
}
EXPORT_SYMBOL(dss_mgr_set_lcd_config);

int dss_mgr_enable(struct omap_overlay_manager *mgr)
{
        return dss_mgr_ops->enable(mgr);
}
EXPORT_SYMBOL(dss_mgr_enable);

void dss_mgr_disable(struct omap_overlay_manager *mgr)
{
        dss_mgr_ops->disable(mgr);
}
EXPORT_SYMBOL(dss_mgr_disable);

void dss_mgr_start_update(struct omap_overlay_manager *mgr)
{
        dss_mgr_ops->start_update(mgr);
}
EXPORT_SYMBOL(dss_mgr_start_update);

int dss_mgr_register_framedone_handler(struct omap_overlay_manager *mgr,
                void (*handler)(void *), void *data)
{
        return dss_mgr_ops->register_framedone_handler(mgr, handler, data);
}
EXPORT_SYMBOL(dss_mgr_register_framedone_handler);

void dss_mgr_unregister_framedone_handler(struct omap_overlay_manager *mgr,
                void (*handler)(void *), void *data)
{
        dss_mgr_ops->unregister_framedone_handler(mgr, handler, data);
}
EXPORT_SYMBOL(dss_mgr_unregister_framedone_handler);