// SPDX-License-Identifier: GPL-2.0
/*
 * Mantix MLAF057WE51 5.7" MIPI-DSI panel driver
 *
 * Copyright (C) Purism SPC 2020
 */

#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/media-bus-format.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>

#define DRV_NAME "panel-mantix-mlaf057we51"

/* Manufacturer specific Commands send via DSI */
#define MANTIX_CMD_OTP_STOP_RELOAD_MIPI 0x41
#define MANTIX_CMD_INT_CANCEL           0x4c
#define MANTIX_CMD_SPI_FINISH           0x90

struct mantix {
        struct device *dev;
        struct drm_panel panel;

        struct gpio_desc *reset_gpio;
        struct gpio_desc *tp_rstn_gpio;

        struct regulator *avdd;
        struct regulator *avee;
        struct regulator *vddi;

        const struct drm_display_mode *default_mode;
};

static inline struct mantix *panel_to_mantix(struct drm_panel *panel)
{
        return container_of(panel, struct mantix, panel);
}

static void mantix_init_sequence(struct mipi_dsi_multi_context *dsi_ctx)
{
        /*
         * Init sequence was supplied by the panel vendor.
         */
        mipi_dsi_generic_write_seq_multi(dsi_ctx, MANTIX_CMD_OTP_STOP_RELOAD_MIPI, 0x5a);

        mipi_dsi_generic_write_seq_multi(dsi_ctx, MANTIX_CMD_INT_CANCEL, 0x03);

        mipi_dsi_generic_write_seq_multi(dsi_ctx, MANTIX_CMD_OTP_STOP_RELOAD_MIPI, 0x5a, 0x03);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, 0x80, 0xa9, 0x00); /* VCOM */

        mipi_dsi_generic_write_seq_multi(dsi_ctx, MANTIX_CMD_SPI_FINISH, 0xa5);
        mipi_dsi_generic_write_seq_multi(dsi_ctx, MANTIX_CMD_OTP_STOP_RELOAD_MIPI, 0x00, 0x2f);
}

static int mantix_enable(struct drm_panel *panel)
{
        struct mantix *ctx = panel_to_mantix(panel);
        struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
        struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

        mantix_init_sequence(&dsi_ctx);
        if (!dsi_ctx.accum_err)
                dev_dbg(ctx->dev, "Panel init sequence done\n");

        /* remainder to 120ms (7.3.1 Note 4) */
        mipi_dsi_msleep(&dsi_ctx, 70);

        mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
        mipi_dsi_msleep(&dsi_ctx, 120);

        mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
        mipi_dsi_usleep_range(&dsi_ctx, 10000, 12000);

        return dsi_ctx.accum_err;
}

static int mantix_disable(struct drm_panel *panel)
{
        struct mantix *ctx = panel_to_mantix(panel);
        struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
        struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

        mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
        mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);

        /* T10 */
        mipi_dsi_msleep(&dsi_ctx, 150);

        return dsi_ctx.accum_err;
}

static int mantix_unprepare(struct drm_panel *panel)
{
        struct mantix *ctx = panel_to_mantix(panel);

        regulator_disable(ctx->avee);
        regulator_disable(ctx->avdd);
        /* T11 */
        usleep_range(5000, 6000);
        regulator_disable(ctx->vddi);

        gpiod_set_value_cansleep(ctx->tp_rstn_gpio, 1);
        usleep_range(5000, 6000);
        gpiod_set_value_cansleep(ctx->reset_gpio, 1);

        /* T14 */
        msleep(50);

        return 0;
}

static int mantix_prepare(struct drm_panel *panel)
{
        struct mantix *ctx = panel_to_mantix(panel);
        int ret;

        /* Focaltech FT8006P, section 7.3.1 and 7.3.4 */
        dev_dbg(ctx->dev, "Resetting the panel\n");
        ret = regulator_enable(ctx->vddi);
        if (ret < 0) {
                dev_err(ctx->dev, "Failed to enable vddi supply: %d\n", ret);
                return ret;
        }

        /* T1 + T2 */
        usleep_range(8000, 10000);

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

        /* T2d */
        usleep_range(3500, 4000);
        ret = regulator_enable(ctx->avee);
        if (ret < 0) {
                dev_err(ctx->dev, "Failed to enable avee supply: %d\n", ret);
                return ret;
        }

        usleep_range(100, 200);
        gpiod_set_value_cansleep(ctx->tp_rstn_gpio, 0);
        usleep_range(100, 200);
        gpiod_set_value_cansleep(ctx->reset_gpio, 0);

        /* T6 */
        msleep(50);

        return 0;
}

static const struct drm_display_mode default_mode_mantix = {
        .hdisplay    = 720,
        .hsync_start = 720 + 45,
        .hsync_end   = 720 + 45 + 14,
        .htotal      = 720 + 45 + 14 + 25,
        .vdisplay    = 1440,
        .vsync_start = 1440 + 130,
        .vsync_end   = 1440 + 130 + 8,
        .vtotal      = 1440 + 130 + 8 + 106,
        .clock       = 85298,
        .flags       = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
        .width_mm    = 65,
        .height_mm   = 130,
};

static const struct drm_display_mode default_mode_ys = {
        .hdisplay    = 720,
        .hsync_start = 720 + 45,
        .hsync_end   = 720 + 45 + 14,
        .htotal      = 720 + 45 + 14 + 25,
        .vdisplay    = 1440,
        .vsync_start = 1440 + 175,
        .vsync_end   = 1440 + 175 + 8,
        .vtotal      = 1440 + 175 + 8 + 50,
        .clock       = 85298,
        .flags       = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
        .width_mm    = 65,
        .height_mm   = 130,
};

static const u32 mantix_bus_formats[] = {
        MEDIA_BUS_FMT_RGB888_1X24,
};

static int mantix_get_modes(struct drm_panel *panel,
                            struct drm_connector *connector)
{
        struct mantix *ctx = panel_to_mantix(panel);
        struct drm_display_mode *mode;

        mode = drm_mode_duplicate(connector->dev, ctx->default_mode);
        if (!mode) {
                dev_err(ctx->dev, "Failed to add mode %ux%u@%u\n",
                        ctx->default_mode->hdisplay, ctx->default_mode->vdisplay,
                        drm_mode_vrefresh(ctx->default_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);

        drm_display_info_set_bus_formats(&connector->display_info,
                                         mantix_bus_formats,
                                         ARRAY_SIZE(mantix_bus_formats));

        return 1;
}

static const struct drm_panel_funcs mantix_drm_funcs = {
        .disable   = mantix_disable,
        .unprepare = mantix_unprepare,
        .prepare   = mantix_prepare,
        .enable    = mantix_enable,
        .get_modes = mantix_get_modes,
};

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

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

        ctx->default_mode = of_device_get_match_data(dev);

        ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
        if (IS_ERR(ctx->reset_gpio)) {
                dev_err(dev, "cannot get reset gpio\n");
                return PTR_ERR(ctx->reset_gpio);
        }

        ctx->tp_rstn_gpio = devm_gpiod_get(dev, "mantix,tp-rstn", GPIOD_OUT_HIGH);
        if (IS_ERR(ctx->tp_rstn_gpio)) {
                dev_err(dev, "cannot get tp-rstn gpio\n");
                return PTR_ERR(ctx->tp_rstn_gpio);
        }

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

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

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

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

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

        ret = drm_panel_of_backlight(&ctx->panel);
        if (ret)
                return ret;

        drm_panel_add(&ctx->panel);

        ret = mipi_dsi_attach(dsi);
        if (ret < 0) {
                dev_err(dev, "mipi_dsi_attach failed (%d). Is host ready?\n", ret);
                drm_panel_remove(&ctx->panel);
                return ret;
        }

        dev_info(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
                 ctx->default_mode->hdisplay, ctx->default_mode->vdisplay,
                 drm_mode_vrefresh(ctx->default_mode),
                 mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);

        return 0;
}

static void mantix_shutdown(struct mipi_dsi_device *dsi)
{
        struct mantix *ctx = mipi_dsi_get_drvdata(dsi);

        drm_panel_unprepare(&ctx->panel);
        drm_panel_disable(&ctx->panel);
}

static void mantix_remove(struct mipi_dsi_device *dsi)
{
        struct mantix *ctx = mipi_dsi_get_drvdata(dsi);

        mantix_shutdown(dsi);

        mipi_dsi_detach(dsi);
        drm_panel_remove(&ctx->panel);
}

static const struct of_device_id mantix_of_match[] = {
        { .compatible = "mantix,mlaf057we51-x", .data = &default_mode_mantix },
        { .compatible = "ys,ys57pss36bh5gq", .data = &default_mode_ys },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mantix_of_match);

static struct mipi_dsi_driver mantix_driver = {
        .probe  = mantix_probe,
        .remove = mantix_remove,
        .shutdown = mantix_shutdown,
        .driver = {
                .name = DRV_NAME,
                .of_match_table = mantix_of_match,
        },
};
module_mipi_dsi_driver(mantix_driver);

MODULE_AUTHOR("Guido Günther <agx@sigxcpu.org>");
MODULE_DESCRIPTION("DRM driver for Mantix MLAF057WE51-X MIPI DSI panel");
MODULE_LICENSE("GPL v2");