// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2019 Theobroma Systems Design und Consulting GmbH
 *
 * base on panel-kingdisplay-kd097d04.c
 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
 */

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

#include <video/mipi_display.h>

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

struct ltk500hd1829_cmd {
        char cmd;
        char data;
};

struct ltk500hd1829_desc {
        const struct drm_display_mode *mode;
        const struct ltk500hd1829_cmd *init;
        unsigned int num_init;
};

struct ltk500hd1829 {
        struct device *dev;
        struct drm_panel panel;
        struct gpio_desc *reset_gpio;
        struct regulator *vcc;
        struct regulator *iovcc;
        const struct ltk500hd1829_desc *panel_desc;
};

static const struct ltk500hd1829_cmd ltk101b4029w_init[] = {
        /* Page0 */
        { 0xE0, 0x00 },
        /* PASSWORD */
        { 0xE1, 0x93 },
        { 0xE2, 0x65 },
        { 0xE3, 0xF8 },
        { 0x80, 0x03 }, /* 0X03:4-LANE; 0X02:3-LANE; 0X01:2-LANE */
        /* Page1 */
        { 0xE0, 0x01 },
        /* Set VCOM */
        { 0x00, 0x00 },
        { 0x01, 0x6F },
        /* Set Gamma Power, VGMP,VGMN,VGSP,VGSN */
        { 0x17, 0x00 },
        { 0x18, 0xAF }, /* 4.3V */
        { 0x19, 0x01 }, /* 0.3V */
        { 0x1A, 0x00 },
        { 0x1B, 0xAF }, /* 4.3V */
        { 0x1C, 0x01 }, /* 0.3V */
        /* Set Gate Power */
        { 0x1F, 0x3E }, /* VGH_R  = 15V */
        { 0x20, 0x28 }, /* VGL_R  = -12V */
        { 0x21, 0x28 }, /* VGL_R2 = -12V */
        { 0x22, 0x7E },
        /* SETPANEL */
        { 0x35, 0x26 },
        { 0x37, 0x09 },
        /* SET RGBCYC */
        { 0x38, 0x04 },
        { 0x39, 0x00 },
        { 0x3A, 0x01 },
        { 0x3C, 0x7C },
        { 0x3D, 0xFF },
        { 0x3E, 0xFF },
        { 0x3F, 0x7F },
        /* Set TCON */
        { 0x40, 0x06 }, /* RSO = 800 RGB */
        { 0x41, 0xA0 }, /* LN = 640->1280 line */
        { 0x42, 0x81 },
        { 0x43, 0x08 }, /* VFP = 8 */
        { 0x44, 0x0B }, /* VBP = 12 */
        { 0x45, 0x28 }, /* HBP = 40 */
        /* power voltage */
        { 0x55, 0x0F }, /* DCDCM = 0001, JD PWR_IC */
        { 0x57, 0x69 },
        { 0x59, 0x0A }, /* VCL = -2.9V */
        { 0x5A, 0x28 }, /* VGH = 15V */
        { 0x5B, 0x14 }, /* VGL = -11V */
        /* Gamma */
        { 0x5D, 0x7C },
        { 0x5E, 0x65 },
        { 0x5F, 0x55 },
        { 0x60, 0x47 },
        { 0x61, 0x43 },
        { 0x62, 0x32 },
        { 0x63, 0x34 },
        { 0x64, 0x1C },
        { 0x65, 0x33 },
        { 0x66, 0x31 },
        { 0x67, 0x30 },
        { 0x68, 0x4E },
        { 0x69, 0x3C },
        { 0x6A, 0x44 },
        { 0x6B, 0x35 },
        { 0x6C, 0x31 },
        { 0x6D, 0x23 },
        { 0x6E, 0x11 },
        { 0x6F, 0x00 },
        { 0x70, 0x7C },
        { 0x71, 0x65 },
        { 0x72, 0x55 },
        { 0x73, 0x47 },
        { 0x74, 0x43 },
        { 0x75, 0x32 },
        { 0x76, 0x34 },
        { 0x77, 0x1C },
        { 0x78, 0x33 },
        { 0x79, 0x31 },
        { 0x7A, 0x30 },
        { 0x7B, 0x4E },
        { 0x7C, 0x3C },
        { 0x7D, 0x44 },
        { 0x7E, 0x35 },
        { 0x7F, 0x31 },
        { 0x80, 0x23 },
        { 0x81, 0x11 },
        { 0x82, 0x00 },
         /* Page2, for GIP */
        { 0xE0, 0x02 },
        /* GIP_L Pin mapping */
        { 0x00, 0x1E },
        { 0x01, 0x1E },
        { 0x02, 0x41 },
        { 0x03, 0x41 },
        { 0x04, 0x43 },
        { 0x05, 0x43 },
        { 0x06, 0x1F },
        { 0x07, 0x1F },
        { 0x08, 0x35 },
        { 0x09, 0x1F },
        { 0x0A, 0x15 },
        { 0x0B, 0x15 },
        { 0x0C, 0x1F },
        { 0x0D, 0x47 },
        { 0x0E, 0x47 },
        { 0x0F, 0x45 },
        { 0x10, 0x45 },
        { 0x11, 0x4B },
        { 0x12, 0x4B },
        { 0x13, 0x49 },
        { 0x14, 0x49 },
        { 0x15, 0x1F },
        /* GIP_R Pin mapping */
        { 0x16, 0x1E },
        { 0x17, 0x1E },
        { 0x18, 0x40 },
        { 0x19, 0x40 },
        { 0x1A, 0x42 },
        { 0x1B, 0x42 },
        { 0x1C, 0x1F },
        { 0x1D, 0x1F },
        { 0x1E, 0x35 },
        { 0x1F, 0x1F },
        { 0x20, 0x15 },
        { 0x21, 0x15 },
        { 0x22, 0x1f },
        { 0x23, 0x46 },
        { 0x24, 0x46 },
        { 0x25, 0x44 },
        { 0x26, 0x44 },
        { 0x27, 0x4A },
        { 0x28, 0x4A },
        { 0x29, 0x48 },
        { 0x2A, 0x48 },
        { 0x2B, 0x1F },
        /* GIP Timing */
        { 0x58, 0x40 },
        { 0x5B, 0x30 },
        { 0x5C, 0x03 },
        { 0x5D, 0x30 },
        { 0x5E, 0x01 },
        { 0x5F, 0x02 },
        { 0x63, 0x14 },
        { 0x64, 0x6A },
        { 0x67, 0x73 },
        { 0x68, 0x05 },
        { 0x69, 0x14 },
        { 0x6A, 0x6A },
        { 0x6B, 0x08 },
        { 0x6C, 0x00 },
        { 0x6D, 0x00 },
        { 0x6E, 0x00 },
        { 0x6F, 0x88 },
        { 0x77, 0xDD },
        { 0x79, 0x0E },
        { 0x7A, 0x03 },
        { 0x7D, 0x14 },
        { 0x7E, 0x6A },
        /* Page4 */
        { 0xE0, 0x04 },
        { 0x09, 0x11 },
        { 0x0E, 0x48 },
        { 0x2B, 0x2B },
        { 0x2D, 0x03 },
        { 0x2E, 0x44 },
        /* Page0 */
        { 0xE0, 0x00 },
        { 0xE6, 0x02 },
        { 0xE7, 0x0C },
};

static const struct drm_display_mode ltk101b4029w_mode = {
        .hdisplay       = 800,
        .hsync_start    = 800 + 18,
        .hsync_end      = 800 + 18 + 18,
        .htotal         = 800 + 18 + 18 + 18,
        .vdisplay       = 1280,
        .vsync_start    = 1280 + 24,
        .vsync_end      = 1280 + 24 + 4,
        .vtotal         = 1280 + 24 + 4 + 8,
        .clock          = 67330,
        .width_mm       = 136,
        .height_mm      = 218,
};

static const struct ltk500hd1829_desc ltk101b4029w_data = {
        .mode = &ltk101b4029w_mode,
        .init = ltk101b4029w_init,
        .num_init = ARRAY_SIZE(ltk101b4029w_init),
};

/*
 * There is no description in the Reference Manual about these commands.
 * We received them from the vendor, so just use them as is.
 */
static const struct ltk500hd1829_cmd ltk500hd1829_init[] = {
        { 0xE0, 0x00 },
        { 0xE1, 0x93 },
        { 0xE2, 0x65 },
        { 0xE3, 0xF8 },
        { 0x80, 0x03 },
        { 0xE0, 0x04 },
        { 0x2D, 0x03 },
        { 0xE0, 0x01 },
        { 0x00, 0x00 },
        { 0x01, 0xB6 },
        { 0x03, 0x00 },
        { 0x04, 0xC5 },
        { 0x17, 0x00 },
        { 0x18, 0xBF },
        { 0x19, 0x01 },
        { 0x1A, 0x00 },
        { 0x1B, 0xBF },
        { 0x1C, 0x01 },
        { 0x1F, 0x7C },
        { 0x20, 0x26 },
        { 0x21, 0x26 },
        { 0x22, 0x4E },
        { 0x37, 0x09 },
        { 0x38, 0x04 },
        { 0x39, 0x08 },
        { 0x3A, 0x1F },
        { 0x3B, 0x1F },
        { 0x3C, 0x78 },
        { 0x3D, 0xFF },
        { 0x3E, 0xFF },
        { 0x3F, 0x00 },
        { 0x40, 0x04 },
        { 0x41, 0xA0 },
        { 0x43, 0x0F },
        { 0x44, 0x0A },
        { 0x45, 0x24 },
        { 0x55, 0x01 },
        { 0x56, 0x01 },
        { 0x57, 0xA5 },
        { 0x58, 0x0A },
        { 0x59, 0x4A },
        { 0x5A, 0x38 },
        { 0x5B, 0x10 },
        { 0x5C, 0x19 },
        { 0x5D, 0x7C },
        { 0x5E, 0x64 },
        { 0x5F, 0x54 },
        { 0x60, 0x48 },
        { 0x61, 0x44 },
        { 0x62, 0x35 },
        { 0x63, 0x3A },
        { 0x64, 0x24 },
        { 0x65, 0x3B },
        { 0x66, 0x39 },
        { 0x67, 0x37 },
        { 0x68, 0x56 },
        { 0x69, 0x41 },
        { 0x6A, 0x47 },
        { 0x6B, 0x2F },
        { 0x6C, 0x23 },
        { 0x6D, 0x13 },
        { 0x6E, 0x02 },
        { 0x6F, 0x08 },
        { 0x70, 0x7C },
        { 0x71, 0x64 },
        { 0x72, 0x54 },
        { 0x73, 0x48 },
        { 0x74, 0x44 },
        { 0x75, 0x35 },
        { 0x76, 0x3A },
        { 0x77, 0x22 },
        { 0x78, 0x3B },
        { 0x79, 0x39 },
        { 0x7A, 0x38 },
        { 0x7B, 0x52 },
        { 0x7C, 0x41 },
        { 0x7D, 0x47 },
        { 0x7E, 0x2F },
        { 0x7F, 0x23 },
        { 0x80, 0x13 },
        { 0x81, 0x02 },
        { 0x82, 0x08 },
        { 0xE0, 0x02 },
        { 0x00, 0x57 },
        { 0x01, 0x77 },
        { 0x02, 0x44 },
        { 0x03, 0x46 },
        { 0x04, 0x48 },
        { 0x05, 0x4A },
        { 0x06, 0x4C },
        { 0x07, 0x4E },
        { 0x08, 0x50 },
        { 0x09, 0x55 },
        { 0x0A, 0x52 },
        { 0x0B, 0x55 },
        { 0x0C, 0x55 },
        { 0x0D, 0x55 },
        { 0x0E, 0x55 },
        { 0x0F, 0x55 },
        { 0x10, 0x55 },
        { 0x11, 0x55 },
        { 0x12, 0x55 },
        { 0x13, 0x40 },
        { 0x14, 0x55 },
        { 0x15, 0x55 },
        { 0x16, 0x57 },
        { 0x17, 0x77 },
        { 0x18, 0x45 },
        { 0x19, 0x47 },
        { 0x1A, 0x49 },
        { 0x1B, 0x4B },
        { 0x1C, 0x4D },
        { 0x1D, 0x4F },
        { 0x1E, 0x51 },
        { 0x1F, 0x55 },
        { 0x20, 0x53 },
        { 0x21, 0x55 },
        { 0x22, 0x55 },
        { 0x23, 0x55 },
        { 0x24, 0x55 },
        { 0x25, 0x55 },
        { 0x26, 0x55 },
        { 0x27, 0x55 },
        { 0x28, 0x55 },
        { 0x29, 0x41 },
        { 0x2A, 0x55 },
        { 0x2B, 0x55 },
        { 0x2C, 0x57 },
        { 0x2D, 0x77 },
        { 0x2E, 0x4F },
        { 0x2F, 0x4D },
        { 0x30, 0x4B },
        { 0x31, 0x49 },
        { 0x32, 0x47 },
        { 0x33, 0x45 },
        { 0x34, 0x41 },
        { 0x35, 0x55 },
        { 0x36, 0x53 },
        { 0x37, 0x55 },
        { 0x38, 0x55 },
        { 0x39, 0x55 },
        { 0x3A, 0x55 },
        { 0x3B, 0x55 },
        { 0x3C, 0x55 },
        { 0x3D, 0x55 },
        { 0x3E, 0x55 },
        { 0x3F, 0x51 },
        { 0x40, 0x55 },
        { 0x41, 0x55 },
        { 0x42, 0x57 },
        { 0x43, 0x77 },
        { 0x44, 0x4E },
        { 0x45, 0x4C },
        { 0x46, 0x4A },
        { 0x47, 0x48 },
        { 0x48, 0x46 },
        { 0x49, 0x44 },
        { 0x4A, 0x40 },
        { 0x4B, 0x55 },
        { 0x4C, 0x52 },
        { 0x4D, 0x55 },
        { 0x4E, 0x55 },
        { 0x4F, 0x55 },
        { 0x50, 0x55 },
        { 0x51, 0x55 },
        { 0x52, 0x55 },
        { 0x53, 0x55 },
        { 0x54, 0x55 },
        { 0x55, 0x50 },
        { 0x56, 0x55 },
        { 0x57, 0x55 },
        { 0x58, 0x40 },
        { 0x59, 0x00 },
        { 0x5A, 0x00 },
        { 0x5B, 0x10 },
        { 0x5C, 0x09 },
        { 0x5D, 0x30 },
        { 0x5E, 0x01 },
        { 0x5F, 0x02 },
        { 0x60, 0x30 },
        { 0x61, 0x03 },
        { 0x62, 0x04 },
        { 0x63, 0x06 },
        { 0x64, 0x6A },
        { 0x65, 0x75 },
        { 0x66, 0x0F },
        { 0x67, 0xB3 },
        { 0x68, 0x0B },
        { 0x69, 0x06 },
        { 0x6A, 0x6A },
        { 0x6B, 0x10 },
        { 0x6C, 0x00 },
        { 0x6D, 0x04 },
        { 0x6E, 0x04 },
        { 0x6F, 0x88 },
        { 0x70, 0x00 },
        { 0x71, 0x00 },
        { 0x72, 0x06 },
        { 0x73, 0x7B },
        { 0x74, 0x00 },
        { 0x75, 0xBC },
        { 0x76, 0x00 },
        { 0x77, 0x05 },
        { 0x78, 0x2E },
        { 0x79, 0x00 },
        { 0x7A, 0x00 },
        { 0x7B, 0x00 },
        { 0x7C, 0x00 },
        { 0x7D, 0x03 },
        { 0x7E, 0x7B },
        { 0xE0, 0x04 },
        { 0x09, 0x10 },
        { 0x2B, 0x2B },
        { 0x2E, 0x44 },
        { 0xE0, 0x00 },
        { 0xE6, 0x02 },
        { 0xE7, 0x02 },
        { 0x35, 0x00 },
};

static const struct drm_display_mode ltk500hd1829_mode = {
        .hdisplay       = 720,
        .hsync_start    = 720 + 50,
        .hsync_end      = 720 + 50 + 50,
        .htotal         = 720 + 50 + 50 + 50,
        .vdisplay       = 1280,
        .vsync_start    = 1280 + 30,
        .vsync_end      = 1280 + 30 + 4,
        .vtotal         = 1280 + 30 + 4 + 12,
        .clock          = 69217,
        .width_mm       = 62,
        .height_mm      = 110,
};

static const struct ltk500hd1829_desc ltk500hd1829_data = {
        .mode = &ltk500hd1829_mode,
        .init = ltk500hd1829_init,
        .num_init = ARRAY_SIZE(ltk500hd1829_init),
};

static inline
struct ltk500hd1829 *panel_to_ltk500hd1829(struct drm_panel *panel)
{
        return container_of(panel, struct ltk500hd1829, panel);
}

static int ltk500hd1829_unprepare(struct drm_panel *panel)
{
        struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
        struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
        int ret;

        ret = mipi_dsi_dcs_set_display_off(dsi);
        if (ret < 0)
                dev_err(panel->dev, "failed to set display off: %d\n", ret);

        ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
        if (ret < 0) {
                dev_err(panel->dev, "failed to enter sleep mode: %d\n", ret);
        }

        /* 120ms to enter sleep mode */
        msleep(120);

        regulator_disable(ctx->iovcc);
        regulator_disable(ctx->vcc);

        return 0;
}

static int ltk500hd1829_prepare(struct drm_panel *panel)
{
        struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
        struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
        unsigned int i;
        int ret;

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

        gpiod_set_value_cansleep(ctx->reset_gpio, 1);
        /* tRW: 10us */
        usleep_range(10, 20);
        gpiod_set_value_cansleep(ctx->reset_gpio, 0);

        /* tRT: >= 5ms */
        usleep_range(5000, 6000);

        for (i = 0; i < ctx->panel_desc->num_init; i++) {
                ret = mipi_dsi_generic_write(dsi, &ctx->panel_desc->init[i],
                                             sizeof(struct ltk500hd1829_cmd));
                if (ret < 0) {
                        dev_err(panel->dev, "failed to write init cmds: %d\n", ret);
                        goto disable_iovcc;
                }
        }

        ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
        if (ret < 0) {
                dev_err(panel->dev, "failed to exit sleep mode: %d\n", ret);
                goto disable_iovcc;
        }

        /* 120ms to exit sleep mode */
        msleep(120);

        ret = mipi_dsi_dcs_set_display_on(dsi);
        if (ret < 0) {
                dev_err(panel->dev, "failed to set display on: %d\n", ret);
                goto disable_iovcc;
        }

        return 0;

disable_iovcc:
        regulator_disable(ctx->iovcc);
disable_vcc:
        regulator_disable(ctx->vcc);
        return ret;
}

static int ltk500hd1829_get_modes(struct drm_panel *panel,
                                  struct drm_connector *connector)
{
        struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
        struct drm_display_mode *mode;

        mode = drm_mode_duplicate(connector->dev, ctx->panel_desc->mode);
        if (!mode) {
                dev_err(ctx->dev, "failed to add mode %ux%u@%u\n",
                        ctx->panel_desc->mode->hdisplay, ctx->panel_desc->mode->vdisplay,
                        drm_mode_vrefresh(ctx->panel_desc->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 ltk500hd1829_funcs = {
        .unprepare = ltk500hd1829_unprepare,
        .prepare = ltk500hd1829_prepare,
        .get_modes = ltk500hd1829_get_modes,
};

static int ltk500hd1829_probe(struct mipi_dsi_device *dsi)
{
        struct ltk500hd1829 *ctx;
        struct device *dev = &dsi->dev;
        int ret;

        ctx = devm_drm_panel_alloc(dev, struct ltk500hd1829, panel,
                                   &ltk500hd1829_funcs,
                                   DRM_MODE_CONNECTOR_DSI);
        if (IS_ERR(ctx))
                return PTR_ERR(ctx);

        ctx->panel_desc = of_device_get_match_data(dev);
        if (!ctx->panel_desc)
                return -EINVAL;

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

        ctx->vcc = devm_regulator_get(dev, "vcc");
        if (IS_ERR(ctx->vcc)) {
                ret = PTR_ERR(ctx->vcc);
                if (ret != -EPROBE_DEFER)
                        dev_err(dev, "Failed to request vcc regulator: %d\n", ret);
                return ret;
        }

        ctx->iovcc = devm_regulator_get(dev, "iovcc");
        if (IS_ERR(ctx->iovcc)) {
                ret = PTR_ERR(ctx->iovcc);
                if (ret != -EPROBE_DEFER)
                        dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
                return ret;
        }

        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_VIDEO_BURST |
                          MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET;

        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\n", ret);
                drm_panel_remove(&ctx->panel);
                return ret;
        }

        return 0;
}

static void ltk500hd1829_remove(struct mipi_dsi_device *dsi)
{
        struct ltk500hd1829 *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 ltk500hd1829_of_match[] = {
        {
                .compatible = "leadtek,ltk101b4029w",
                .data = &ltk101b4029w_data,
        },
        {
                .compatible = "leadtek,ltk500hd1829",
                .data = &ltk500hd1829_data,
        },
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ltk500hd1829_of_match);

static struct mipi_dsi_driver ltk500hd1829_driver = {
        .driver = {
                .name = "panel-leadtek-ltk500hd1829",
                .of_match_table = ltk500hd1829_of_match,
        },
        .probe = ltk500hd1829_probe,
        .remove = ltk500hd1829_remove,
};
module_mipi_dsi_driver(ltk500hd1829_driver);

MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
MODULE_DESCRIPTION("Leadtek LTK500HD1829 panel driver");
MODULE_LICENSE("GPL v2");