// SPDX-License-Identifier: GPL-2.0-only

#include <linux/array_size.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>

#include <video/mipi_display.h>

#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>

struct samsung_ltl106hl02 {
        struct drm_panel panel;
        struct mipi_dsi_device *dsi;

        struct regulator *supply;
        struct gpio_desc *reset_gpio;
};

static inline struct samsung_ltl106hl02 *to_samsung_ltl106hl02(struct drm_panel *panel)
{
        return container_of(panel, struct samsung_ltl106hl02, panel);
}

static void samsung_ltl106hl02_reset(struct samsung_ltl106hl02 *ctx)
{
        gpiod_set_value_cansleep(ctx->reset_gpio, 1);
        usleep_range(10000, 11000);
        gpiod_set_value_cansleep(ctx->reset_gpio, 0);
        usleep_range(2000, 3000);
}

static int samsung_ltl106hl02_prepare(struct drm_panel *panel)
{
        struct samsung_ltl106hl02 *ctx = to_samsung_ltl106hl02(panel);
        struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
        struct device *dev = &ctx->dsi->dev;
        int ret;

        ret = regulator_enable(ctx->supply);
        if (ret < 0) {
                dev_err(dev, "failed to enable power supply %d\n", ret);
                return ret;
        }

        if (ctx->reset_gpio)
                samsung_ltl106hl02_reset(ctx);

        mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
        mipi_dsi_msleep(&dsi_ctx, 70);

        mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
        mipi_dsi_msleep(&dsi_ctx, 5);

        return dsi_ctx.accum_err;
}

static int samsung_ltl106hl02_unprepare(struct drm_panel *panel)
{
        struct samsung_ltl106hl02 *ctx = to_samsung_ltl106hl02(panel);
        struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };

        mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
        mipi_dsi_msleep(&dsi_ctx, 50);
        mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
        mipi_dsi_msleep(&dsi_ctx, 150);

        if (ctx->reset_gpio)
                gpiod_set_value_cansleep(ctx->reset_gpio, 1);

        regulator_disable(ctx->supply);

        return 0;
}

static const struct drm_display_mode samsung_ltl106hl02_mode = {
        .clock = (1920 + 32 + 32 + 64) * (1080 + 6 + 3 + 22) * 60 / 1000,
        .hdisplay = 1920,
        .hsync_start = 1920 + 32,
        .hsync_end = 1920 + 32 + 32,
        .htotal = 1920 + 32 + 32 + 64,
        .vdisplay = 1080,
        .vsync_start = 1080 + 6,
        .vsync_end = 1080 + 6 + 3,
        .vtotal = 1080 + 6 + 3 + 22,
        .width_mm = 235,
        .height_mm = 132,
        .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
};

static int samsung_ltl106hl02_get_modes(struct drm_panel *panel,
                                        struct drm_connector *connector)
{
        return drm_connector_helper_get_modes_fixed(connector, &samsung_ltl106hl02_mode);
}

static const struct drm_panel_funcs samsung_ltl106hl02_panel_funcs = {
        .prepare = samsung_ltl106hl02_prepare,
        .unprepare = samsung_ltl106hl02_unprepare,
        .get_modes = samsung_ltl106hl02_get_modes,
};

static int samsung_ltl106hl02_probe(struct mipi_dsi_device *dsi)
{
        struct device *dev = &dsi->dev;
        struct samsung_ltl106hl02 *ctx;
        int ret;

        ctx = devm_drm_panel_alloc(dev, struct samsung_ltl106hl02, panel,
                                   &samsung_ltl106hl02_panel_funcs,
                                   DRM_MODE_CONNECTOR_DSI);
        if (IS_ERR(ctx))
                return PTR_ERR(ctx);

        ctx->supply = devm_regulator_get(dev, "power");
        if (IS_ERR(ctx->supply))
                return dev_err_probe(dev, PTR_ERR(ctx->supply),
                                     "Failed to get power regulator\n");

        ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
        if (IS_ERR(ctx->reset_gpio))
                return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
                                     "Failed to get reset-gpios\n");

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

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

        ret = drm_panel_of_backlight(&ctx->panel);
        if (ret)
                return dev_err_probe(dev, ret, "Failed to get backlight\n");

        drm_panel_add(&ctx->panel);

        ret = devm_mipi_dsi_attach(dev, dsi);
        if (ret < 0) {
                drm_panel_remove(&ctx->panel);
                return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
        }

        return 0;
}

static void samsung_ltl106hl02_remove(struct mipi_dsi_device *dsi)
{
        struct samsung_ltl106hl02 *ctx = mipi_dsi_get_drvdata(dsi);

        drm_panel_remove(&ctx->panel);
}

static const struct of_device_id samsung_ltl106hl02_of_match[] = {
        { .compatible = "samsung,ltl106hl02-001" },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, samsung_ltl106hl02_of_match);

static struct mipi_dsi_driver samsung_ltl106hl02_driver = {
        .driver = {
                .name = "panel-samsung-ltl106hl02",
                .of_match_table = samsung_ltl106hl02_of_match,
        },
        .probe = samsung_ltl106hl02_probe,
        .remove = samsung_ltl106hl02_remove,
};
module_mipi_dsi_driver(samsung_ltl106hl02_driver);

MODULE_AUTHOR("Anton Bambura <jenneron@protonmail.com>");
MODULE_DESCRIPTION("DRM driver for Samsung LTL106HL02 video mode DSI panel");
MODULE_LICENSE("GPL");