// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2019-2024 Linaro Ltd
 * Author: Sumit Semwal <sumit.semwal@linaro.org>
 *       Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
 */

#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_panel.h>
#include <drm/drm_probe_helper.h>
#include <drm/display/drm_dsc.h>
#include <drm/display/drm_dsc_helper.h>

static const struct regulator_bulk_data sw43408_supplies[] = {
        { .supply = "vddi", /* 1.8 V */
          .init_load_uA = 62000 },
        { .supply = "vpnl", /* 3.0 V */
          .init_load_uA = 857000 },
};

struct sw43408_panel {
        struct drm_panel base;
        struct mipi_dsi_device *link;

        struct regulator_bulk_data *supplies;

        struct gpio_desc *reset_gpio;

        struct drm_dsc_config dsc;
};

static inline struct sw43408_panel *to_panel_info(struct drm_panel *panel)
{
        return container_of(panel, struct sw43408_panel, base);
}

static int sw43408_unprepare(struct drm_panel *panel)
{
        struct sw43408_panel *sw43408 = to_panel_info(panel);
        struct mipi_dsi_multi_context ctx = { .dsi = sw43408->link };
        int ret;

        mipi_dsi_dcs_set_display_off_multi(&ctx);

        mipi_dsi_dcs_enter_sleep_mode_multi(&ctx);

        mipi_dsi_msleep(&ctx, 100);

        gpiod_set_value(sw43408->reset_gpio, 1);

        ret = regulator_bulk_disable(ARRAY_SIZE(sw43408_supplies), sw43408->supplies);

        return ret ? : ctx.accum_err;
}

static int sw43408_program(struct drm_panel *panel)
{
        struct sw43408_panel *sw43408 = to_panel_info(panel);
        struct mipi_dsi_multi_context ctx = { .dsi = sw43408->link };
        struct drm_dsc_picture_parameter_set pps;

        mipi_dsi_dcs_write_seq_multi(&ctx, MIPI_DCS_SET_GAMMA_CURVE, 0x02);

        mipi_dsi_dcs_set_tear_on_multi(&ctx, MIPI_DSI_DCS_TEAR_MODE_VBLANK);

        mipi_dsi_dcs_write_seq_multi(&ctx, 0x53, 0x0c, 0x30);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0x55, 0x00, 0x70, 0xdf, 0x00, 0x70, 0xdf);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xf7, 0x01, 0x49, 0x0c);

        mipi_dsi_dcs_exit_sleep_mode_multi(&ctx);

        mipi_dsi_msleep(&ctx, 135);

        /* COMPRESSION_MODE moved after setting the PPS */

        mipi_dsi_dcs_write_seq_multi(&ctx, 0xb0, 0xac);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xe5,
                               0x00, 0x3a, 0x00, 0x3a, 0x00, 0x0e, 0x10);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xb5,
                               0x75, 0x60, 0x2d, 0x5d, 0x80, 0x00, 0x0a, 0x0b,
                               0x00, 0x05, 0x0b, 0x00, 0x80, 0x0d, 0x0e, 0x40,
                               0x00, 0x0c, 0x00, 0x16, 0x00, 0xb8, 0x00, 0x80,
                               0x0d, 0x0e, 0x40, 0x00, 0x0c, 0x00, 0x16, 0x00,
                               0xb8, 0x00, 0x81, 0x00, 0x03, 0x03, 0x03, 0x01,
                               0x01);
        mipi_dsi_msleep(&ctx, 85);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xcd,
                               0x00, 0x00, 0x00, 0x19, 0x19, 0x19, 0x19, 0x19,
                               0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19,
                               0x16, 0x16);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xcb, 0x80, 0x5c, 0x07, 0x03, 0x28);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xc0, 0x02, 0x02, 0x0f);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0x55, 0x04, 0x61, 0xdb, 0x04, 0x70, 0xdb);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xb0, 0xca);

        mipi_dsi_dcs_set_display_on_multi(&ctx);

        mipi_dsi_msleep(&ctx, 50);

        sw43408->link->mode_flags &= ~MIPI_DSI_MODE_LPM;

        drm_dsc_pps_payload_pack(&pps, sw43408->link->dsc);

        mipi_dsi_picture_parameter_set_multi(&ctx, &pps);

        sw43408->link->mode_flags |= MIPI_DSI_MODE_LPM;

        /*
         * This panel uses PPS selectors with offset:
         * PPS 1 if pps_identifier is 0
         * PPS 2 if pps_identifier is 1
         */
        mipi_dsi_compression_mode_ext_multi(&ctx, true,
                                            MIPI_DSI_COMPRESSION_DSC, 1);
        return ctx.accum_err;
}

static void sw43408_reset(struct sw43408_panel *ctx)
{
        gpiod_set_value(ctx->reset_gpio, 0);
        usleep_range(9000, 10000);
        gpiod_set_value(ctx->reset_gpio, 1);
        usleep_range(1000, 2000);
        gpiod_set_value(ctx->reset_gpio, 0);
        usleep_range(9000, 10000);
}

static int sw43408_prepare(struct drm_panel *panel)
{
        struct sw43408_panel *ctx = to_panel_info(panel);
        int ret;

        ret = regulator_bulk_enable(ARRAY_SIZE(sw43408_supplies), ctx->supplies);
        if (ret < 0)
                return ret;

        usleep_range(5000, 6000);

        sw43408_reset(ctx);

        ret = sw43408_program(panel);
        if (ret)
                goto poweroff;

        return 0;

poweroff:
        gpiod_set_value(ctx->reset_gpio, 1);
        regulator_bulk_disable(ARRAY_SIZE(sw43408_supplies), ctx->supplies);
        return ret;
}

static const struct drm_display_mode lh546wf1_ed01_mode = {
        .clock = (1080 + 20 + 32 + 20) * (2160 + 20 + 4 + 20) * 60 / 1000,

        .hdisplay = 1080,
        .hsync_start = 1080 + 20,
        .hsync_end = 1080 + 20 + 32,
        .htotal = 1080 + 20 + 32 + 20,

        .vdisplay = 2160,
        .vsync_start = 2160 + 20,
        .vsync_end = 2160 + 20 + 4,
        .vtotal = 2160 + 20 + 4 + 20,

        .width_mm = 62,
        .height_mm = 124,

        .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
};

static int sw43408_get_modes(struct drm_panel *panel,
                             struct drm_connector *connector)
{
        return drm_connector_helper_get_modes_fixed(connector, &lh546wf1_ed01_mode);
}

static int sw43408_backlight_update_status(struct backlight_device *bl)
{
        struct mipi_dsi_device *dsi = bl_get_data(bl);
        u16 brightness = backlight_get_brightness(bl);

        return mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
}

static const struct backlight_ops sw43408_backlight_ops = {
        .update_status = sw43408_backlight_update_status,
};

static int sw43408_backlight_init(struct sw43408_panel *ctx)
{
        struct device *dev = &ctx->link->dev;
        const struct backlight_properties props = {
                .type = BACKLIGHT_PLATFORM,
                .brightness = 255,
                .max_brightness = 255,
        };

        ctx->base.backlight = devm_backlight_device_register(dev, dev_name(dev), dev,
                                                             ctx->link,
                                                             &sw43408_backlight_ops,
                                                             &props);

        if (IS_ERR(ctx->base.backlight))
                return dev_err_probe(dev, PTR_ERR(ctx->base.backlight),
                                     "Failed to create backlight\n");

        return 0;
}

static const struct drm_panel_funcs sw43408_funcs = {
        .unprepare = sw43408_unprepare,
        .prepare = sw43408_prepare,
        .get_modes = sw43408_get_modes,
};

static const struct of_device_id sw43408_of_match[] = {
        { .compatible = "lg,sw43408", }, /* legacy */
        { .compatible = "lg,sw43408-lh546wf1-ed01", },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sw43408_of_match);

static int sw43408_add(struct sw43408_panel *ctx)
{
        struct device *dev = &ctx->link->dev;
        int ret;

        ret = devm_regulator_bulk_get_const(dev,
                                            ARRAY_SIZE(sw43408_supplies),
                                            sw43408_supplies,
                                            &ctx->supplies);
        if (ret < 0)
                return ret;

        ctx->reset_gpio = devm_gpiod_get(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");
        }

        ret = sw43408_backlight_init(ctx);
        if (ret < 0)
                return ret;

        ctx->base.prepare_prev_first = true;

        drm_panel_add(&ctx->base);
        return ret;
}

static int sw43408_probe(struct mipi_dsi_device *dsi)
{
        struct sw43408_panel *ctx;
        int ret;

        ctx = devm_drm_panel_alloc(&dsi->dev, __typeof(*ctx), base,
                                   &sw43408_funcs, DRM_MODE_CONNECTOR_DSI);

        if (IS_ERR(ctx))
                return PTR_ERR(ctx);

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

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

        ret = sw43408_add(ctx);
        if (ret < 0)
                return ret;

        /* The panel works only in the DSC mode. Set DSC params. */
        ctx->dsc.dsc_version_major = 0x1;
        ctx->dsc.dsc_version_minor = 0x1;

        /* slice_count * slice_width == width */
        ctx->dsc.slice_height = 16;
        ctx->dsc.slice_width = 540;
        ctx->dsc.slice_count = 2;
        ctx->dsc.bits_per_component = 8;
        ctx->dsc.bits_per_pixel = 8 << 4;
        ctx->dsc.block_pred_enable = true;

        dsi->dsc = &ctx->dsc;

        return mipi_dsi_attach(dsi);
}

static void sw43408_remove(struct mipi_dsi_device *dsi)
{
        struct sw43408_panel *ctx = mipi_dsi_get_drvdata(dsi);
        int ret;

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

        drm_panel_remove(&ctx->base);
}

static struct mipi_dsi_driver sw43408_driver = {
        .driver = {
                .name = "panel-lg-sw43408",
                .of_match_table = sw43408_of_match,
        },
        .probe = sw43408_probe,
        .remove = sw43408_remove,
};
module_mipi_dsi_driver(sw43408_driver);

MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
MODULE_DESCRIPTION("LG SW436408 MIPI-DSI LED panel");
MODULE_LICENSE("GPL");