// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2018-2019, Bridge Systems BV
 * Copyright (C) 2018-2019, Bootlin
 * Copyright (C) 2017, Free Electrons
 *
 * This file based on panel-ilitek-ili9881c.c
 */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/fb.h>
#include <linux/kernel.h>
#include <linux/media-bus-format.h>
#include <linux/module.h>

#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>

#include <drm/drm_connector.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>

struct rb070d30_panel {
        struct drm_panel panel;
        struct mipi_dsi_device *dsi;
        struct backlight_device *backlight;
        struct regulator *supply;

        struct {
                struct gpio_desc *power;
                struct gpio_desc *reset;
                struct gpio_desc *updn;
                struct gpio_desc *shlr;
        } gpios;
};

static inline struct rb070d30_panel *panel_to_rb070d30_panel(struct drm_panel *panel)
{
        return container_of(panel, struct rb070d30_panel, panel);
}

static int rb070d30_panel_prepare(struct drm_panel *panel)
{
        struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
        int ret;

        ret = regulator_enable(ctx->supply);
        if (ret < 0) {
                DRM_DEV_ERROR(&ctx->dsi->dev, "Failed to enable supply: %d\n", ret);
                return ret;
        }

        msleep(20);
        gpiod_set_value(ctx->gpios.power, 1);
        msleep(20);
        gpiod_set_value(ctx->gpios.reset, 1);
        msleep(20);
        return 0;
}

static int rb070d30_panel_unprepare(struct drm_panel *panel)
{
        struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);

        gpiod_set_value(ctx->gpios.reset, 0);
        gpiod_set_value(ctx->gpios.power, 0);
        regulator_disable(ctx->supply);

        return 0;
}

static int rb070d30_panel_enable(struct drm_panel *panel)
{
        struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
        int ret;

        ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
        if (ret)
                return ret;

        ret = backlight_enable(ctx->backlight);
        if (ret)
                goto out;

        return 0;

out:
        mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
        return ret;
}

static int rb070d30_panel_disable(struct drm_panel *panel)
{
        struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);

        backlight_disable(ctx->backlight);
        return mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
}

/* Default timings */
static const struct drm_display_mode default_mode = {
        .clock          = 51206,
        .hdisplay       = 1024,
        .hsync_start    = 1024 + 160,
        .hsync_end      = 1024 + 160 + 80,
        .htotal         = 1024 + 160 + 80 + 80,
        .vdisplay       = 600,
        .vsync_start    = 600 + 12,
        .vsync_end      = 600 + 12 + 10,
        .vtotal         = 600 + 12 + 10 + 13,
        .vrefresh       = 60,

        .width_mm       = 154,
        .height_mm      = 85,
};

static int rb070d30_panel_get_modes(struct drm_panel *panel)
{
        struct drm_connector *connector = panel->connector;
        struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
        struct drm_display_mode *mode;
        static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;

        mode = drm_mode_duplicate(panel->drm, &default_mode);
        if (!mode) {
                DRM_DEV_ERROR(&ctx->dsi->dev,
                              "Failed to add mode " DRM_MODE_FMT "\n",
                              DRM_MODE_ARG(&default_mode));
                return -EINVAL;
        }

        drm_mode_set_name(mode);

        mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
        drm_mode_probed_add(connector, mode);

        panel->connector->display_info.bpc = 8;
        panel->connector->display_info.width_mm = mode->width_mm;
        panel->connector->display_info.height_mm = mode->height_mm;
        drm_display_info_set_bus_formats(&connector->display_info,
                                         &bus_format, 1);

        return 1;
}

static const struct drm_panel_funcs rb070d30_panel_funcs = {
        .get_modes      = rb070d30_panel_get_modes,
        .prepare        = rb070d30_panel_prepare,
        .enable         = rb070d30_panel_enable,
        .disable        = rb070d30_panel_disable,
        .unprepare      = rb070d30_panel_unprepare,
};

static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi)
{
        struct rb070d30_panel *ctx;
        int ret;

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

        ctx->supply = devm_regulator_get(&dsi->dev, "vcc-lcd");
        if (IS_ERR(ctx->supply))
                return PTR_ERR(ctx->supply);

        mipi_dsi_set_drvdata(dsi, ctx);
        ctx->dsi = dsi;

        drm_panel_init(&ctx->panel);
        ctx->panel.dev = &dsi->dev;
        ctx->panel.funcs = &rb070d30_panel_funcs;

        ctx->gpios.reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
        if (IS_ERR(ctx->gpios.reset)) {
                DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
                return PTR_ERR(ctx->gpios.reset);
        }

        ctx->gpios.power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW);
        if (IS_ERR(ctx->gpios.power)) {
                DRM_DEV_ERROR(&dsi->dev, "Couldn't get our power GPIO\n");
                return PTR_ERR(ctx->gpios.power);
        }

        /*
         * We don't change the state of that GPIO later on but we need
         * to force it into a low state.
         */
        ctx->gpios.updn = devm_gpiod_get(&dsi->dev, "updn", GPIOD_OUT_LOW);
        if (IS_ERR(ctx->gpios.updn)) {
                DRM_DEV_ERROR(&dsi->dev, "Couldn't get our updn GPIO\n");
                return PTR_ERR(ctx->gpios.updn);
        }

        /*
         * We don't change the state of that GPIO later on but we need
         * to force it into a low state.
         */
        ctx->gpios.shlr = devm_gpiod_get(&dsi->dev, "shlr", GPIOD_OUT_LOW);
        if (IS_ERR(ctx->gpios.shlr)) {
                DRM_DEV_ERROR(&dsi->dev, "Couldn't get our shlr GPIO\n");
                return PTR_ERR(ctx->gpios.shlr);
        }

        ctx->backlight = devm_of_find_backlight(&dsi->dev);
        if (IS_ERR(ctx->backlight)) {
                DRM_DEV_ERROR(&dsi->dev, "Couldn't get our backlight\n");
                return PTR_ERR(ctx->backlight);
        }

        ret = drm_panel_add(&ctx->panel);
        if (ret < 0)
                return ret;

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

        return mipi_dsi_attach(dsi);
}

static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi)
{
        struct rb070d30_panel *ctx = mipi_dsi_get_drvdata(dsi);

        mipi_dsi_detach(dsi);
        drm_panel_remove(&ctx->panel);

        return 0;
}

static const struct of_device_id rb070d30_panel_of_match[] = {
        { .compatible = "ronbo,rb070d30" },
        { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, rb070d30_panel_of_match);

static struct mipi_dsi_driver rb070d30_panel_driver = {
        .probe = rb070d30_panel_dsi_probe,
        .remove = rb070d30_panel_dsi_remove,
        .driver = {
                .name = "panel-ronbo-rb070d30",
                .of_match_table = rb070d30_panel_of_match,
        },
};
module_mipi_dsi_driver(rb070d30_panel_driver);

MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>");
MODULE_AUTHOR("Konstantin Sudakov <k.sudakov@integrasources.com>");
MODULE_DESCRIPTION("Ronbo RB070D30 Panel Driver");
MODULE_LICENSE("GPL");