/*
 * TFP410 DPI-to-DVI encoder driver
 *
 * Copyright (C) 2013 Texas Instruments
 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <video/omapdss.h>
#include <video/omap-panel-data.h>

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

        int pd_gpio;
        int data_lines;

        struct omap_video_timings timings;
};

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

static int tfp410_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;

        if (omapdss_device_is_connected(dssdev))
                return -EBUSY;

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

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

        return 0;
}

static void tfp410_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(!omapdss_device_is_connected(dssdev));
        if (!omapdss_device_is_connected(dssdev))
                return;

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

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

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

static int tfp410_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 (!omapdss_device_is_connected(dssdev))
                return -ENODEV;

        if (omapdss_device_is_enabled(dssdev))
                return 0;

        in->ops.dpi->set_timings(in, &ddata->timings);
        in->ops.dpi->set_data_lines(in, ddata->data_lines);

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

        if (gpio_is_valid(ddata->pd_gpio))
                gpio_set_value_cansleep(ddata->pd_gpio, 1);

        dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;

        return 0;
}

static void tfp410_disable(struct omap_dss_device *dssdev)
{
        struct panel_drv_data *ddata = to_panel_data(dssdev);
        struct omap_dss_device *in = ddata->in;

        if (!omapdss_device_is_enabled(dssdev))
                return;

        if (gpio_is_valid(ddata->pd_gpio))
                gpio_set_value_cansleep(ddata->pd_gpio, 0);

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

        dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
}

static void tfp410_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.dpi->set_timings(in, timings);
}

static void tfp410_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 tfp410_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;

        return in->ops.dpi->check_timings(in, timings);
}

static const struct omapdss_dvi_ops tfp410_dvi_ops = {
        .connect        = tfp410_connect,
        .disconnect     = tfp410_disconnect,

        .enable         = tfp410_enable,
        .disable        = tfp410_disable,

        .check_timings  = tfp410_check_timings,
        .set_timings    = tfp410_set_timings,
        .get_timings    = tfp410_get_timings,
};

static int tfp410_probe_pdata(struct platform_device *pdev)
{
        struct panel_drv_data *ddata = platform_get_drvdata(pdev);
        struct encoder_tfp410_platform_data *pdata;
        struct omap_dss_device *dssdev, *in;

        pdata = dev_get_platdata(&pdev->dev);

        ddata->pd_gpio = pdata->power_down_gpio;

        ddata->data_lines = pdata->data_lines;

        in = omap_dss_find_output(pdata->source);
        if (in == NULL) {
                dev_err(&pdev->dev, "Failed to find video source\n");
                return -ENODEV;
        }

        ddata->in = in;

        dssdev = &ddata->dssdev;
        dssdev->name = pdata->name;

        return 0;
}

static int tfp410_probe(struct platform_device *pdev)
{
        struct panel_drv_data *ddata;
        struct omap_dss_device *dssdev;
        int r;

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

        platform_set_drvdata(pdev, ddata);

        if (dev_get_platdata(&pdev->dev)) {
                r = tfp410_probe_pdata(pdev);
                if (r)
                        return r;
        } else {
                return -ENODEV;
        }

        if (gpio_is_valid(ddata->pd_gpio)) {
                r = devm_gpio_request_one(&pdev->dev, ddata->pd_gpio,
                                GPIOF_OUT_INIT_LOW, "tfp410 PD");
                if (r) {
                        dev_err(&pdev->dev, "Failed to request PD GPIO %d\n",
                                        ddata->pd_gpio);
                        goto err_gpio;
                }
        }

        dssdev = &ddata->dssdev;
        dssdev->ops.dvi = &tfp410_dvi_ops;
        dssdev->dev = &pdev->dev;
        dssdev->type = OMAP_DISPLAY_TYPE_DPI;
        dssdev->output_type = OMAP_DISPLAY_TYPE_DVI;
        dssdev->owner = THIS_MODULE;
        dssdev->phy.dpi.data_lines = ddata->data_lines;

        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 int __exit tfp410_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))
                tfp410_disable(dssdev);

        WARN_ON(omapdss_device_is_connected(dssdev));
        if (omapdss_device_is_connected(dssdev))
                tfp410_disconnect(dssdev, dssdev->dst);

        omap_dss_put_device(in);

        return 0;
}

static struct platform_driver tfp410_driver = {
        .probe  = tfp410_probe,
        .remove = __exit_p(tfp410_remove),
        .driver = {
                .name   = "tfp410",
                .owner  = THIS_MODULE,
        },
};

module_platform_driver(tfp410_driver);

MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
MODULE_DESCRIPTION("TFP410 DPI to DVI encoder driver");
MODULE_LICENSE("GPL");