// 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/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>

static const struct regulator_bulk_data lg_ld070wx3_supplies[] = {
        { .supply = "vdd" }, { .supply = "vcc" },
};

struct lg_ld070wx3 {
        struct drm_panel panel;
        struct mipi_dsi_device *dsi;

        struct regulator_bulk_data *supplies;
};

static inline struct lg_ld070wx3 *to_lg_ld070wx3(struct drm_panel *panel)
{
        return container_of(panel, struct lg_ld070wx3, panel);
}

static int lg_ld070wx3_prepare(struct drm_panel *panel)
{
        struct lg_ld070wx3 *priv = to_lg_ld070wx3(panel);
        struct mipi_dsi_multi_context ctx = { .dsi = priv->dsi };
        struct device *dev = panel->dev;
        int ret;

        ret = regulator_bulk_enable(ARRAY_SIZE(lg_ld070wx3_supplies), priv->supplies);
        if (ret < 0) {
                dev_err(dev, "failed to enable power supplies: %d\n", ret);
                return ret;
        }

        /*
         * According to spec delay between enabling supply is 0,
         * for regulators to reach required voltage ~5ms needed.
         * MIPI interface signal for setup requires additional
         * 110ms which in total results in 115ms.
         */
        mdelay(115);

        mipi_dsi_dcs_soft_reset_multi(&ctx);
        mipi_dsi_msleep(&ctx, 20);

        /* Differential input impedance selection */
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xae, 0x0b);

        /* Enter test mode 1 and 2*/
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xee, 0xea);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xef, 0x5f);

        /* Increased MIPI CLK driving ability */
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xf2, 0x68);

        /* Exit test mode 1 and 2 */
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xee, 0x00);
        mipi_dsi_dcs_write_seq_multi(&ctx, 0xef, 0x00);

        return ctx.accum_err;
}

static int lg_ld070wx3_unprepare(struct drm_panel *panel)
{
        struct lg_ld070wx3 *priv = to_lg_ld070wx3(panel);
        struct mipi_dsi_multi_context ctx = { .dsi = priv->dsi };

        mipi_dsi_dcs_enter_sleep_mode_multi(&ctx);

        msleep(50);

        regulator_bulk_disable(ARRAY_SIZE(lg_ld070wx3_supplies), priv->supplies);

        /* power supply must be off for at least 1s after panel disable */
        msleep(1000);

        return 0;
}

static const struct drm_display_mode lg_ld070wx3_mode = {
        .clock = (800 + 32 + 48 + 8) * (1280 + 5 + 3 + 1) * 60 / 1000,
        .hdisplay = 800,
        .hsync_start = 800 + 32,
        .hsync_end = 800 + 32 + 48,
        .htotal = 800 + 32 + 48 + 8,
        .vdisplay = 1280,
        .vsync_start = 1280 + 5,
        .vsync_end = 1280 + 5 + 3,
        .vtotal = 1280 + 5 + 3 + 1,
        .width_mm = 94,
        .height_mm = 151,
        .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
};

static int lg_ld070wx3_get_modes(struct drm_panel *panel,
                                 struct drm_connector *connector)
{
        return drm_connector_helper_get_modes_fixed(connector, &lg_ld070wx3_mode);
}

static const struct drm_panel_funcs lg_ld070wx3_panel_funcs = {
        .prepare = lg_ld070wx3_prepare,
        .unprepare = lg_ld070wx3_unprepare,
        .get_modes = lg_ld070wx3_get_modes,
};

static int lg_ld070wx3_probe(struct mipi_dsi_device *dsi)
{
        struct device *dev = &dsi->dev;
        struct lg_ld070wx3 *priv;
        int ret;

        priv = devm_drm_panel_alloc(dev, struct lg_ld070wx3, panel,
                                    &lg_ld070wx3_panel_funcs,
                                    DRM_MODE_CONNECTOR_DSI);
        if (IS_ERR(priv))
                return PTR_ERR(priv);

        ret = devm_regulator_bulk_get_const(dev, ARRAY_SIZE(lg_ld070wx3_supplies),
                                            lg_ld070wx3_supplies, &priv->supplies);
        if (ret < 0)
                return dev_err_probe(dev, ret, "failed to get supplies\n");

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

        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(&priv->panel);
        if (ret < 0)
                return dev_err_probe(dev, ret, "failed to get backlight\n");

        drm_panel_add(&priv->panel);

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

        return 0;
}

static void lg_ld070wx3_remove(struct mipi_dsi_device *dsi)
{
        struct lg_ld070wx3 *priv = mipi_dsi_get_drvdata(dsi);

        drm_panel_remove(&priv->panel);
}

static const struct of_device_id lg_ld070wx3_of_match[] = {
        { .compatible = "lg,ld070wx3-sl01" },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, lg_ld070wx3_of_match);

static struct mipi_dsi_driver lg_ld070wx3_driver = {
        .driver = {
                .name = "panel-lg-ld070wx3",
                .of_match_table = lg_ld070wx3_of_match,
        },
        .probe = lg_ld070wx3_probe,
        .remove = lg_ld070wx3_remove,
};
module_mipi_dsi_driver(lg_ld070wx3_driver);

MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
MODULE_DESCRIPTION("LG LD070WX3-SL01 DSI panel driver");
MODULE_LICENSE("GPL");