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

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

struct tm5p5_nt35596 {
        struct drm_panel panel;
        struct mipi_dsi_device *dsi;
        struct regulator_bulk_data supplies[2];
        struct gpio_desc *reset_gpio;
};

static inline struct tm5p5_nt35596 *to_tm5p5_nt35596(struct drm_panel *panel)
{
        return container_of(panel, struct tm5p5_nt35596, panel);
}

static void tm5p5_nt35596_reset(struct tm5p5_nt35596 *ctx)
{
        gpiod_set_value_cansleep(ctx->reset_gpio, 1);
        usleep_range(1000, 2000);
        gpiod_set_value_cansleep(ctx->reset_gpio, 0);
        usleep_range(1000, 2000);
        gpiod_set_value_cansleep(ctx->reset_gpio, 1);
        usleep_range(15000, 16000);
}

static void tm5p5_nt35596_on(struct mipi_dsi_multi_context *dsi_ctx)
{
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0xff, 0x05);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0xfb, 0x01);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0xc5, 0x31);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0xff, 0x04);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x01, 0x84);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x05, 0x25);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x06, 0x01);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x07, 0x20);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x08, 0x06);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x09, 0x08);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x0a, 0x10);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x0b, 0x10);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x0c, 0x10);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x0d, 0x14);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x0e, 0x14);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x0f, 0x14);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x10, 0x14);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x11, 0x14);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x12, 0x14);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x17, 0xf3);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x18, 0xc0);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x19, 0xc0);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x1a, 0xc0);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x1b, 0xb3);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x1c, 0xb3);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x1d, 0xb3);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x1e, 0xb3);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x1f, 0xb3);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x20, 0xb3);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0xfb, 0x01);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0xff, 0x00);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0xfb, 0x01);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x35, 0x01);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0xd3, 0x06);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0xd4, 0x04);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x5e, 0x0d);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x11, 0x00);

        mipi_dsi_msleep(dsi_ctx, 100);

        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x29, 0x00);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x53, 0x24);
}

static void tm5p5_nt35596_off(struct mipi_dsi_multi_context *dsi_ctx)
{
        mipi_dsi_dcs_set_display_off_multi(dsi_ctx);

        mipi_dsi_msleep(dsi_ctx, 60);

        mipi_dsi_dcs_enter_sleep_mode_multi(dsi_ctx);

        mipi_dsi_dcs_write_seq_multi(dsi_ctx, 0x4f, 0x01);
}

static int tm5p5_nt35596_prepare(struct drm_panel *panel)
{
        struct tm5p5_nt35596 *ctx = to_tm5p5_nt35596(panel);
        struct mipi_dsi_multi_context dsi_ctx = {.dsi = ctx->dsi};

        dsi_ctx.accum_err = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
        if (dsi_ctx.accum_err)
                return dsi_ctx.accum_err;

        tm5p5_nt35596_reset(ctx);

        tm5p5_nt35596_on(&dsi_ctx);

        if (dsi_ctx.accum_err) {
                gpiod_set_value_cansleep(ctx->reset_gpio, 0);
                regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
                                       ctx->supplies);
        }

        return dsi_ctx.accum_err;
}

static int tm5p5_nt35596_unprepare(struct drm_panel *panel)
{
        struct tm5p5_nt35596 *ctx = to_tm5p5_nt35596(panel);
        struct mipi_dsi_multi_context dsi_ctx = {.dsi = ctx->dsi};

        tm5p5_nt35596_off(&dsi_ctx);

        gpiod_set_value_cansleep(ctx->reset_gpio, 0);
        regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
                               ctx->supplies);

        return dsi_ctx.accum_err;
}

static const struct drm_display_mode tm5p5_nt35596_mode = {
        .clock = (1080 + 100 + 8 + 16) * (1920 + 4 + 2 + 4) * 60 / 1000,
        .hdisplay = 1080,
        .hsync_start = 1080 + 100,
        .hsync_end = 1080 + 100 + 8,
        .htotal = 1080 + 100 + 8 + 16,
        .vdisplay = 1920,
        .vsync_start = 1920 + 4,
        .vsync_end = 1920 + 4 + 2,
        .vtotal = 1920 + 4 + 2 + 4,
        .width_mm = 68,
        .height_mm = 121,
};

static int tm5p5_nt35596_get_modes(struct drm_panel *panel,
                                   struct drm_connector *connector)
{
        struct drm_display_mode *mode;

        mode = drm_mode_duplicate(connector->dev, &tm5p5_nt35596_mode);
        if (!mode)
                return -ENOMEM;

        drm_mode_set_name(mode);

        mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
        connector->display_info.width_mm = mode->width_mm;
        connector->display_info.height_mm = mode->height_mm;
        drm_mode_probed_add(connector, mode);

        return 1;
}

static const struct drm_panel_funcs tm5p5_nt35596_panel_funcs = {
        .prepare = tm5p5_nt35596_prepare,
        .unprepare = tm5p5_nt35596_unprepare,
        .get_modes = tm5p5_nt35596_get_modes,
};

static int tm5p5_nt35596_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(dsi, brightness);
        if (ret < 0)
                return ret;

        dsi->mode_flags |= MIPI_DSI_MODE_LPM;

        return 0;
}

static int tm5p5_nt35596_bl_get_brightness(struct backlight_device *bl)
{
        struct mipi_dsi_device *dsi = bl_get_data(bl);
        u16 brightness = bl->props.brightness;
        int ret;

        dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;

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

        dsi->mode_flags |= MIPI_DSI_MODE_LPM;

        return brightness & 0xff;
}

static const struct backlight_ops tm5p5_nt35596_bl_ops = {
        .update_status = tm5p5_nt35596_bl_update_status,
        .get_brightness = tm5p5_nt35596_bl_get_brightness,
};

static struct backlight_device *
tm5p5_nt35596_create_backlight(struct mipi_dsi_device *dsi)
{
        struct device *dev = &dsi->dev;
        const struct backlight_properties props = {
                .type = BACKLIGHT_RAW,
                .brightness = 255,
                .max_brightness = 255,
        };

        return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
                                              &tm5p5_nt35596_bl_ops, &props);
}

static int tm5p5_nt35596_probe(struct mipi_dsi_device *dsi)
{
        struct device *dev = &dsi->dev;
        struct tm5p5_nt35596 *ctx;
        int ret;

        ctx = devm_drm_panel_alloc(dev, struct tm5p5_nt35596, panel,
                                   &tm5p5_nt35596_panel_funcs,
                                   DRM_MODE_CONNECTOR_DSI);
        if (IS_ERR(ctx))
                return PTR_ERR(ctx);

        ctx->supplies[0].supply = "vdd";
        ctx->supplies[1].supply = "vddio";
        ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
                                      ctx->supplies);
        if (ret < 0) {
                dev_err(dev, "Failed to get regulators: %d\n", ret);
                return ret;
        }

        ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
        if (IS_ERR(ctx->reset_gpio)) {
                ret = PTR_ERR(ctx->reset_gpio);
                dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
                return ret;
        }

        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_VIDEO_BURST |
                          MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_NO_EOT_PACKET |
                          MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM;

        ctx->panel.backlight = tm5p5_nt35596_create_backlight(dsi);
        if (IS_ERR(ctx->panel.backlight)) {
                ret = PTR_ERR(ctx->panel.backlight);
                dev_err(dev, "Failed to create backlight: %d\n", ret);
                return ret;
        }

        drm_panel_add(&ctx->panel);

        ret = mipi_dsi_attach(dsi);
        if (ret < 0) {
                dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
                return ret;
        }

        return 0;
}

static void tm5p5_nt35596_remove(struct mipi_dsi_device *dsi)
{
        struct tm5p5_nt35596 *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->panel);
}

static const struct of_device_id tm5p5_nt35596_of_match[] = {
        { .compatible = "asus,z00t-tm5p5-n35596" },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, tm5p5_nt35596_of_match);

static struct mipi_dsi_driver tm5p5_nt35596_driver = {
        .probe = tm5p5_nt35596_probe,
        .remove = tm5p5_nt35596_remove,
        .driver = {
                .name = "panel-tm5p5-nt35596",
                .of_match_table = tm5p5_nt35596_of_match,
        },
};
module_mipi_dsi_driver(tm5p5_nt35596_driver);

MODULE_AUTHOR("Konrad Dybcio <konradybcio@gmail.com>");
MODULE_DESCRIPTION("DRM driver for tm5p5 nt35596 1080p video mode dsi panel");
MODULE_LICENSE("GPL v2");