// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2015 Red Hat
 * Copyright (C) 2015 Sony Mobile Communications Inc.
 * Author: Werner Johansson <werner.johansson@sonymobile.com>
 *
 * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
 */

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>

#include <video/mipi_display.h>

#include <drm/drm_crtc.h>
#include <drm/drm_device.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>

/*
 * When power is turned off to this panel a minimum off time of 500ms has to be
 * observed before powering back on as there's no external reset pin. Keep
 * track of earliest wakeup time and delay subsequent prepare call accordingly
 */
#define MIN_POFF_MS (500)

struct wuxga_nt_panel {
        struct drm_panel base;
        struct mipi_dsi_device *dsi;

        struct regulator *supply;

        bool prepared;
        bool enabled;

        ktime_t earliest_wake;

        const struct drm_display_mode *mode;
};

static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
{
        return container_of(panel, struct wuxga_nt_panel, base);
}

static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
{
        return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
}

static int wuxga_nt_panel_disable(struct drm_panel *panel)
{
        struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
        int mipi_ret, bl_ret = 0;

        if (!wuxga_nt->enabled)
                return 0;

        mipi_ret = mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);

        wuxga_nt->enabled = false;

        return mipi_ret ? mipi_ret : bl_ret;
}

static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
{
        struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);

        if (!wuxga_nt->prepared)
                return 0;

        regulator_disable(wuxga_nt->supply);
        wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
        wuxga_nt->prepared = false;

        return 0;
}

static int wuxga_nt_panel_prepare(struct drm_panel *panel)
{
        struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
        int ret;
        s64 enablewait;

        if (wuxga_nt->prepared)
                return 0;

        /*
         * If the user re-enabled the panel before the required off-time then
         * we need to wait the remaining period before re-enabling regulator
         */
        enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());

        /* Sanity check, this should never happen */
        if (enablewait > MIN_POFF_MS)
                enablewait = MIN_POFF_MS;

        if (enablewait > 0)
                msleep(enablewait);

        ret = regulator_enable(wuxga_nt->supply);
        if (ret < 0)
                return ret;

        /*
         * A minimum delay of 250ms is required after power-up until commands
         * can be sent
         */
        msleep(250);

        ret = wuxga_nt_panel_on(wuxga_nt);
        if (ret < 0) {
                dev_err(panel->dev, "failed to set panel on: %d\n", ret);
                goto poweroff;
        }

        wuxga_nt->prepared = true;

        return 0;

poweroff:
        regulator_disable(wuxga_nt->supply);

        return ret;
}

static int wuxga_nt_panel_enable(struct drm_panel *panel)
{
        struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);

        if (wuxga_nt->enabled)
                return 0;

        wuxga_nt->enabled = true;

        return 0;
}

static const struct drm_display_mode default_mode = {
        .clock = 164402,
        .hdisplay = 1920,
        .hsync_start = 1920 + 152,
        .hsync_end = 1920 + 152 + 52,
        .htotal = 1920 + 152 + 52 + 20,
        .vdisplay = 1200,
        .vsync_start = 1200 + 24,
        .vsync_end = 1200 + 24 + 6,
        .vtotal = 1200 + 24 + 6 + 48,
};

static int wuxga_nt_panel_get_modes(struct drm_panel *panel,
                                    struct drm_connector *connector)
{
        struct drm_display_mode *mode;

        mode = drm_mode_duplicate(connector->dev, &default_mode);
        if (!mode) {
                dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
                        default_mode.hdisplay, default_mode.vdisplay,
                        drm_mode_vrefresh(&default_mode));
                return -ENOMEM;
        }

        drm_mode_set_name(mode);

        drm_mode_probed_add(connector, mode);

        connector->display_info.width_mm = 217;
        connector->display_info.height_mm = 136;

        return 1;
}

static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
        .disable = wuxga_nt_panel_disable,
        .unprepare = wuxga_nt_panel_unprepare,
        .prepare = wuxga_nt_panel_prepare,
        .enable = wuxga_nt_panel_enable,
        .get_modes = wuxga_nt_panel_get_modes,
};

static const struct of_device_id wuxga_nt_of_match[] = {
        { .compatible = "panasonic,vvx10f034n00", },
        { }
};
MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);

static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
{
        struct device *dev = &wuxga_nt->dsi->dev;
        int ret;

        wuxga_nt->mode = &default_mode;

        wuxga_nt->supply = devm_regulator_get(dev, "power");
        if (IS_ERR(wuxga_nt->supply))
                return PTR_ERR(wuxga_nt->supply);

        drm_panel_init(&wuxga_nt->base, &wuxga_nt->dsi->dev,
                       &wuxga_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);

        ret = drm_panel_of_backlight(&wuxga_nt->base);
        if (ret)
                return ret;

        drm_panel_add(&wuxga_nt->base);

        return 0;
}

static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
{
        if (wuxga_nt->base.dev)
                drm_panel_remove(&wuxga_nt->base);
}

static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
{
        struct wuxga_nt_panel *wuxga_nt;
        int ret;

        dsi->lanes = 4;
        dsi->format = MIPI_DSI_FMT_RGB888;
        dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
                        MIPI_DSI_MODE_VIDEO_HSE |
                        MIPI_DSI_CLOCK_NON_CONTINUOUS |
                        MIPI_DSI_MODE_LPM;

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

        mipi_dsi_set_drvdata(dsi, wuxga_nt);

        wuxga_nt->dsi = dsi;

        ret = wuxga_nt_panel_add(wuxga_nt);
        if (ret < 0)
                return ret;

        return mipi_dsi_attach(dsi);
}

static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
{
        struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
        int ret;

        ret = drm_panel_disable(&wuxga_nt->base);
        if (ret < 0)
                dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);

        ret = mipi_dsi_detach(dsi);
        if (ret < 0)
                dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);

        wuxga_nt_panel_del(wuxga_nt);

        return 0;
}

static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
{
        struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);

        drm_panel_disable(&wuxga_nt->base);
}

static struct mipi_dsi_driver wuxga_nt_panel_driver = {
        .driver = {
                .name = "panel-panasonic-vvx10f034n00",
                .of_match_table = wuxga_nt_of_match,
        },
        .probe = wuxga_nt_panel_probe,
        .remove = wuxga_nt_panel_remove,
        .shutdown = wuxga_nt_panel_shutdown,
};
module_mipi_dsi_driver(wuxga_nt_panel_driver);

MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
MODULE_LICENSE("GPL v2");