// SPDX-License-Identifier: GPL-2.0-only
/*
 * TPD12S015 HDMI ESD protection & level shifter chip driver
 *
 * Copyright (C) 2013 Texas Instruments
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 */

#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>

#include <video/omapfb_dss.h>

struct panel_drv_data {
        struct omap_dss_device dssdev;
        struct omap_dss_device *in;

        struct gpio_desc *ct_cp_hpd_gpio;
        struct gpio_desc *ls_oe_gpio;
        struct gpio_desc *hpd_gpio;

        struct omap_video_timings timings;
};

#define to_panel_data(x) container_of(x, struct panel_drv_data, dssdev)

static int tpd_connect(struct omap_dss_device *dssdev,
                struct omap_dss_device *dst)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;
        int r;

        r = in->ops.hdmi->connect(in, dssdev);
        if (r)
                return r;

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

        if (ddata->ct_cp_hpd_gpio) {
                gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 1);
                /* DC-DC converter needs at max 300us to get to 90% of 5V */
                udelay(300);
        }

        return 0;
}

static void tpd_disconnect(struct omap_dss_device *dssdev,
                struct omap_dss_device *dst)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        WARN_ON(dst != dssdev->dst);

        if (dst != dssdev->dst)
                return;

        gpiod_set_value_cansleep(ddata->ct_cp_hpd_gpio, 0);

        dst->src = NULL;
        dssdev->dst = NULL;

        in->ops.hdmi->disconnect(in, &ddata->dssdev);
}

static int tpd_enable(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;
        int r;

        if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
                return 0;

        in->ops.hdmi->set_timings(in, &ddata->timings);

        r = in->ops.hdmi->enable(in);
        if (r)
                return r;

        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

        return r;
}

static void tpd_disable(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
                return;

        in->ops.hdmi->disable(in);

        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static void tpd_set_timings(struct omap_dss_device *dssdev,
                struct omap_video_timings *timings)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        ddata->timings = *timings;
        dssdev->panel.timings = *timings;

        in->ops.hdmi->set_timings(in, timings);
}

static void tpd_get_timings(struct omap_dss_device *dssdev,
                struct omap_video_timings *timings)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);

        *timings = ddata->timings;
}

static int tpd_check_timings(struct omap_dss_device *dssdev,
                struct omap_video_timings *timings)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;
        int r;

        r = in->ops.hdmi->check_timings(in, timings);

        return r;
}

static int tpd_read_edid(struct omap_dss_device *dssdev,
                u8 *edid, int len)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;
        int r;

        if (!gpiod_get_value_cansleep(ddata->hpd_gpio))
                return -ENODEV;

        gpiod_set_value_cansleep(ddata->ls_oe_gpio, 1);

        r = in->ops.hdmi->read_edid(in, edid, len);

        gpiod_set_value_cansleep(ddata->ls_oe_gpio, 0);

        return r;
}

static bool tpd_detect(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);

        return gpiod_get_value_cansleep(ddata->hpd_gpio);
}

static int tpd_set_infoframe(struct omap_dss_device *dssdev,
                const struct hdmi_avi_infoframe *avi)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        return in->ops.hdmi->set_infoframe(in, avi);
}

static int tpd_set_hdmi_mode(struct omap_dss_device *dssdev,
                bool hdmi_mode)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        return in->ops.hdmi->set_hdmi_mode(in, hdmi_mode);
}

static const struct omapdss_hdmi_ops tpd_hdmi_ops = {
        .connect                = tpd_connect,
        .disconnect             = tpd_disconnect,

        .enable                 = tpd_enable,
        .disable                = tpd_disable,

        .check_timings          = tpd_check_timings,
        .set_timings            = tpd_set_timings,
        .get_timings            = tpd_get_timings,

        .read_edid              = tpd_read_edid,
        .detect                 = tpd_detect,
        .set_infoframe          = tpd_set_infoframe,
        .set_hdmi_mode          = tpd_set_hdmi_mode,
};

static int tpd_probe_of(struct platform_device *pdev)
{
        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
        struct device_node *node = pdev->dev.of_node;
        struct omap_dss_device *in;

        in = omapdss_of_find_source_for_first_ep(node);
        if (IS_ERR(in)) {
                dev_err(&pdev->dev, "failed to find video source\n");
                return PTR_ERR(in);
        }

        ddata->in = in;

        return 0;
}

static int tpd_probe(struct platform_device *pdev)
{
        struct omap_dss_device *dssdev;
        struct panel_drv_data *ddata;
        int r;
        struct gpio_desc *gpio;

        ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
        if (!ddata)
                return -ENOMEM;

        platform_set_drvdata(pdev, ddata);

        if (pdev->dev.of_node) {
                r = tpd_probe_of(pdev);
                if (r)
                        return r;
        } else {
                return -ENODEV;
        }

        gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 0,
                GPIOD_OUT_LOW);
        if (IS_ERR(gpio)) {
                r = PTR_ERR(gpio);
                goto err_gpio;
        }

        ddata->ct_cp_hpd_gpio = gpio;

        gpio = devm_gpiod_get_index_optional(&pdev->dev, NULL, 1,
                GPIOD_OUT_LOW);
        if (IS_ERR(gpio)) {
                r = PTR_ERR(gpio);
                goto err_gpio;
        }

        ddata->ls_oe_gpio = gpio;

        gpio = devm_gpiod_get_index(&pdev->dev, NULL, 2,
                GPIOD_IN);
        if (IS_ERR(gpio)) {
                r = PTR_ERR(gpio);
                goto err_gpio;
        }

        ddata->hpd_gpio = gpio;

        dssdev = &ddata->dssdev;
        dssdev->ops.hdmi = &tpd_hdmi_ops;
        dssdev->dev = &pdev->dev;
        dssdev->type = OMAP_DISPLAY_TYPE_HDMI;
        dssdev->output_type = OMAP_DISPLAY_TYPE_HDMI;
        dssdev->owner = THIS_MODULE;
        dssdev->port_num = 1;

        r = omapdss_register_output(dssdev);
        if (r) {
                dev_err(&pdev->dev, "Failed to register output\n");
                goto err_reg;
        }

        return 0;
err_reg:
err_gpio:
        omap_dss_put_device(ddata->in);
        return r;
}

static void tpd_remove(struct platform_device *pdev)
{
        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
        struct omap_dss_device *dssdev = &ddata->dssdev;
        struct omap_dss_device *in = ddata->in;

        omapdss_unregister_output(&ddata->dssdev);

        WARN_ON(omapdss_device_is_enabled(dssdev));
        if (omapdss_device_is_enabled(dssdev))
                tpd_disable(dssdev);

        WARN_ON(omapdss_device_is_connected(dssdev));
        if (omapdss_device_is_connected(dssdev))
                tpd_disconnect(dssdev, dssdev->dst);

        omap_dss_put_device(in);
}

static const struct of_device_id tpd_of_match[] = {
        { .compatible = "omapdss,ti,tpd12s015", },
        {},
};

MODULE_DEVICE_TABLE(of, tpd_of_match);

static struct platform_driver tpd_driver = {
        .probe  = tpd_probe,
        .remove = tpd_remove,
        .driver = {
                .name   = "tpd12s015",
                .of_match_table = tpd_of_match,
        },
};

module_platform_driver(tpd_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("TPD12S015 driver");
MODULE_LICENSE("GPL");