// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2024, Danila Tikhonov <danila@jiaxyga.com>
 */

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

/* Manufacturer Command Set */
#define MCS_ACCESS_PROT_OFF     0xb0
#define MCS_PASSWD              0xf0

struct ams581vf01 {
        struct drm_panel panel;
        struct mipi_dsi_device *dsi;
        struct gpio_desc *reset_gpio;
        struct regulator_bulk_data *supplies;
};

static const struct regulator_bulk_data ams581vf01_supplies[] = {
        { .supply = "vdd3p3" },
        { .supply = "vddio" },
        { .supply = "vsn" },
        { .supply = "vsp" },
};

static inline struct ams581vf01 *to_ams581vf01(struct drm_panel *panel)
{
        return container_of(panel, struct ams581vf01, panel);
}

static void ams581vf01_reset(struct ams581vf01 *ctx)
{
        gpiod_set_value_cansleep(ctx->reset_gpio, 1);
        usleep_range(10000, 11000);
        gpiod_set_value_cansleep(ctx->reset_gpio, 0);
        usleep_range(10000, 11000);
}

static int ams581vf01_on(struct ams581vf01 *ctx)
{
        struct mipi_dsi_device *dsi = ctx->dsi;
        struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

        /* Sleep Out, Wait 10ms */
        mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
        usleep_range(10000, 11000);

        /* TE On */
        mipi_dsi_dcs_set_tear_on_multi(&dsi_ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);

        /* MIC Setting */
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD, 0x5a, 0x5a); /* Unlock */
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xeb, 0x17,
                                               0x41, 0x92,
                                               0x0e, 0x10,
                                               0x82, 0x5a);
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD, 0xa5, 0xa5); /* Lock */

        /* Column & Page Address Setting */
        mipi_dsi_dcs_set_column_address_multi(&dsi_ctx, 0x0000, 0x0437);
        mipi_dsi_dcs_set_page_address_multi(&dsi_ctx, 0x0000, 0x0923);

        /* Brightness Setting */
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20);

        /* Horizontal & Vertical sync Setting */
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD, 0x5a, 0x5a); /* Unlock */
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_ACCESS_PROT_OFF, 0x09);
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xe8, 0x11, 0x30);
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD, 0xa5, 0xa5); /* Lock */
        mipi_dsi_msleep(&dsi_ctx, 110);

        /* Display On */
        mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);

        return dsi_ctx.accum_err;
}

static void ams581vf01_off(struct ams581vf01 *ctx)
{
        struct mipi_dsi_device *dsi = ctx->dsi;
        struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

        /* Display Off & Sleep In */
        mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
        mipi_dsi_msleep(&dsi_ctx, 20);
        mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);

        /* VCI operating mode change */
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD, 0x5a, 0x5a); /* Unlock */
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_ACCESS_PROT_OFF, 0x05);
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, 0xf4, 0x01);
        mipi_dsi_dcs_write_seq_multi(&dsi_ctx, MCS_PASSWD, 0xa5, 0xa5);  /* Lock */

        mipi_dsi_msleep(&dsi_ctx, 120);
}

static int ams581vf01_prepare(struct drm_panel *panel)
{
        struct ams581vf01 *ctx = to_ams581vf01(panel);
        int ret;

        ret = regulator_bulk_enable(ARRAY_SIZE(ams581vf01_supplies),
                                    ctx->supplies);
        if (ret < 0)
                return ret;

        ams581vf01_reset(ctx);

        ret = ams581vf01_on(ctx);
        if (ret < 0) {
                gpiod_set_value_cansleep(ctx->reset_gpio, 1);
                regulator_bulk_disable(ARRAY_SIZE(ams581vf01_supplies),
                                       ctx->supplies);
                return ret;
        }

        return 0;
}

static int ams581vf01_unprepare(struct drm_panel *panel)
{
        struct ams581vf01 *ctx = to_ams581vf01(panel);

        ams581vf01_off(ctx);

        gpiod_set_value_cansleep(ctx->reset_gpio, 1);
        regulator_bulk_disable(ARRAY_SIZE(ams581vf01_supplies),
                               ctx->supplies);

        return 0;
}

static const struct drm_display_mode ams581vf01_mode = {
        .clock = (1080 + 32 + 73 + 98) * (2340 + 8 + 1 + 8) * 60 / 1000,
        .hdisplay = 1080,
        .hsync_start = 1080 + 32,
        .hsync_end = 1080 + 32 + 73,
        .htotal = 1080 + 32 + 73 + 98,
        .vdisplay = 2340,
        .vsync_start = 2340 + 8,
        .vsync_end = 2340 + 8 + 1,
        .vtotal = 2340 + 8 + 1 + 8,
        .width_mm = 62,
        .height_mm = 134,
        .type = DRM_MODE_TYPE_DRIVER,
};

static int ams581vf01_get_modes(struct drm_panel *panel,
                                 struct drm_connector *connector)
{
        return drm_connector_helper_get_modes_fixed(connector, &ams581vf01_mode);
}

static const struct drm_panel_funcs ams581vf01_panel_funcs = {
        .prepare = ams581vf01_prepare,
        .unprepare = ams581vf01_unprepare,
        .get_modes = ams581vf01_get_modes,
};

static int ams581vf01_bl_update_status(struct backlight_device *bl)
{
        struct mipi_dsi_device *dsi = bl_get_data(bl);
        u16 brightness = backlight_get_brightness(bl);
        int ret;

        dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

        ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
        if (ret < 0)
                return ret;

        dsi->mode_flags |= MIPI_DSI_MODE_LPM;

        return 0;
}

static const struct backlight_ops ams581vf01_bl_ops = {
        .update_status = ams581vf01_bl_update_status,
};

static struct backlight_device *
ams581vf01_create_backlight(struct mipi_dsi_device *dsi)
{
        struct device *dev = &dsi->dev;
        const struct backlight_properties props = {
                .type = BACKLIGHT_RAW,
                .brightness = 511,
                .max_brightness = 1023,
        };

        return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
                                                &ams581vf01_bl_ops, &props);
}

static int ams581vf01_probe(struct mipi_dsi_device *dsi)
{
        struct device *dev = &dsi->dev;
        struct ams581vf01 *ctx;
        int ret;

        ctx = devm_drm_panel_alloc(&dsi->dev, struct ams581vf01, panel,
                                   &ams581vf01_panel_funcs,
                                   DRM_MODE_CONNECTOR_DSI);
        if (IS_ERR(ctx))
                return PTR_ERR(ctx);

        ret = devm_regulator_bulk_get_const(&dsi->dev,
                                            ARRAY_SIZE(ams581vf01_supplies),
                                            ams581vf01_supplies,
                                            &ctx->supplies);
        if (ret < 0)
                return dev_err_probe(dev, ret, "Failed to get regulators\n");

        ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
        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_BURST |
                          MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM;

        ctx->panel.prepare_prev_first = true;

        ctx->panel.backlight = ams581vf01_create_backlight(dsi);
        if (IS_ERR(ctx->panel.backlight))
                return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
                                        "Failed to create 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 ams581vf01_remove(struct mipi_dsi_device *dsi)
{
        struct ams581vf01 *ctx = mipi_dsi_get_drvdata(dsi);

        drm_panel_remove(&ctx->panel);
}

static const struct of_device_id ams581vf01_of_match[] = {
        { .compatible = "samsung,ams581vf01" },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ams581vf01_of_match);

static struct mipi_dsi_driver ams581vf01_driver = {
        .probe = ams581vf01_probe,
        .remove = ams581vf01_remove,
        .driver = {
                .name = "panel-samsung-ams581vf01",
                .of_match_table = ams581vf01_of_match,
        },
};
module_mipi_dsi_driver(ams581vf01_driver);

MODULE_AUTHOR("Danila Tikhonov <danila@jiaxyga.com>");
MODULE_DESCRIPTION("DRM driver for SAMSUNG AMS581VF01 cmd mode dsi panel");
MODULE_LICENSE("GPL");