// SPDX-License-Identifier: GPL-2.0
/*
 * Synaptics R63353 Controller driver
 *
 * Copyright (C) 2020 BSH Hausgerate GmbH
 */

#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/media-bus-format.h>

#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>

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

#include <video/mipi_display.h>

#define R63353_INSTR(...) { \
                .len = sizeof((u8[]) {__VA_ARGS__}), \
                .data = (u8[]){__VA_ARGS__} \
        }

struct r63353_instr {
        size_t len;
        const u8 *data;
};

static const struct r63353_instr sharp_ls068b3sx02_init[] = {
        R63353_INSTR(0x51, 0xff),
        R63353_INSTR(0x53, 0x0c),
        R63353_INSTR(0x55, 0x00),
        R63353_INSTR(0x84, 0x00),
        R63353_INSTR(0x29),
};

struct r63353_desc {
        const char *name;
        const struct r63353_instr *init;
        const size_t init_length;
        const struct drm_display_mode *mode;
        u32 width_mm;
        u32 height_mm;
};

struct r63353_panel {
        struct drm_panel base;
        struct mipi_dsi_device *dsi;

        struct gpio_desc *reset_gpio;
        struct regulator *dvdd;
        struct regulator *avdd;

        struct r63353_desc *pdata;
};

static inline struct r63353_panel *to_r63353_panel(struct drm_panel *panel)
{
        return container_of(panel, struct r63353_panel, base);
}

static int r63353_panel_power_on(struct r63353_panel *rpanel)
{
        struct mipi_dsi_device *dsi = rpanel->dsi;
        struct device *dev = &dsi->dev;
        int ret;

        ret = regulator_enable(rpanel->avdd);
        if (ret) {
                dev_err(dev, "Failed to enable avdd regulator (%d)\n", ret);
                return ret;
        }

        usleep_range(15000, 25000);

        ret = regulator_enable(rpanel->dvdd);
        if (ret) {
                dev_err(dev, "Failed to enable dvdd regulator (%d)\n", ret);
                regulator_disable(rpanel->avdd);
                return ret;
        }

        usleep_range(300000, 350000);
        gpiod_set_value(rpanel->reset_gpio, 1);
        usleep_range(15000, 25000);

        return 0;
}

static int r63353_panel_power_off(struct r63353_panel *rpanel)
{
        gpiod_set_value(rpanel->reset_gpio, 0);
        regulator_disable(rpanel->dvdd);
        regulator_disable(rpanel->avdd);

        return 0;
}

static int r63353_panel_activate(struct r63353_panel *rpanel)
{
        struct mipi_dsi_device *dsi = rpanel->dsi;
        struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };
        int i;

        mipi_dsi_dcs_soft_reset_multi(&dsi_ctx);

        mipi_dsi_usleep_range(&dsi_ctx, 15000, 17000);

        mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);

        for (i = 0; i < rpanel->pdata->init_length; i++) {
                const struct r63353_instr *instr = &rpanel->pdata->init[i];

                mipi_dsi_dcs_write_buffer_multi(&dsi_ctx, instr->data,
                                                instr->len);
        }

        mipi_dsi_msleep(&dsi_ctx, 120);

        mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);

        mipi_dsi_usleep_range(&dsi_ctx, 5000, 10000);

        mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);

        if (dsi_ctx.accum_err)
                gpiod_set_value(rpanel->reset_gpio, 0);

        return dsi_ctx.accum_err;
}

static int r63353_panel_prepare(struct drm_panel *panel)
{
        struct r63353_panel *rpanel = to_r63353_panel(panel);
        struct mipi_dsi_device *dsi = rpanel->dsi;
        struct device *dev = &dsi->dev;
        int ret;

        dev_dbg(dev, "Preparing\n");

        ret = r63353_panel_power_on(rpanel);
        if (ret)
                return ret;

        ret = r63353_panel_activate(rpanel);
        if (ret) {
                r63353_panel_power_off(rpanel);
                return ret;
        }

        dev_dbg(dev, "Prepared\n");
        return 0;
}

static void r63353_panel_deactivate(struct r63353_panel *rpanel)
{
        struct mipi_dsi_device *dsi = rpanel->dsi;
        struct mipi_dsi_multi_context dsi_ctx = { .dsi = dsi };

        mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);

        mipi_dsi_usleep_range(&dsi_ctx, 5000, 10000);

        mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
}

static int r63353_panel_unprepare(struct drm_panel *panel)
{
        struct r63353_panel *rpanel = to_r63353_panel(panel);

        r63353_panel_deactivate(rpanel);
        r63353_panel_power_off(rpanel);

        return 0;
}

static const struct drm_display_mode sharp_ls068b3sx02_timing = {
        .clock = 70000,
        .hdisplay = 640,
        .hsync_start = 640 + 35,
        .hsync_end = 640 + 35 + 2,
        .htotal = 640 + 35 + 2 + 150,
        .vdisplay = 1280,
        .vsync_start = 1280 + 2,
        .vsync_end = 1280 + 2 + 4,
        .vtotal = 1280 + 2 + 4 + 0,
};

static int r63353_panel_get_modes(struct drm_panel *panel,
                                  struct drm_connector *connector)
{
        struct r63353_panel *rpanel = to_r63353_panel(panel);
        struct drm_display_mode *mode;
        static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;

        mode = drm_mode_duplicate(connector->dev, rpanel->pdata->mode);
        if (!mode)
                return -ENOMEM;

        drm_mode_set_name(mode);
        drm_mode_probed_add(connector, mode);

        mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
        connector->display_info.width_mm = rpanel->pdata->width_mm;
        connector->display_info.height_mm = rpanel->pdata->height_mm;

        drm_display_info_set_bus_formats(&connector->display_info,
                                         &bus_format, 1);

        return 1;
}

static const struct drm_panel_funcs r63353_panel_funcs = {
        .prepare = r63353_panel_prepare,
        .unprepare = r63353_panel_unprepare,
        .get_modes = r63353_panel_get_modes,
};

static int r63353_panel_probe(struct mipi_dsi_device *dsi)
{
        int ret = 0;
        struct device *dev = &dsi->dev;
        struct r63353_panel *panel;

        panel = devm_drm_panel_alloc(dev, struct r63353_panel, base,
                                     &r63353_panel_funcs,
                                     DRM_MODE_CONNECTOR_DSI);
        if (IS_ERR(panel))
                return PTR_ERR(panel);

        mipi_dsi_set_drvdata(dsi, panel);
        panel->dsi = dsi;
        panel->pdata = (struct r63353_desc *)of_device_get_match_data(dev);

        dev_info(dev, "Panel %s\n", panel->pdata->name);

        dsi->lanes = 2;
        dsi->format = MIPI_DSI_FMT_RGB888;
        dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
                          MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM |
                          MIPI_DSI_MODE_VIDEO_SYNC_PULSE | MIPI_DSI_MODE_NO_EOT_PACKET;

        panel->dvdd = devm_regulator_get(dev, "dvdd");
        if (IS_ERR(panel->dvdd))
                return PTR_ERR(panel->dvdd);
        panel->avdd = devm_regulator_get(dev, "avdd");
        if (IS_ERR(panel->avdd))
                return PTR_ERR(panel->avdd);

        panel->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
        if (IS_ERR(panel->reset_gpio)) {
                dev_err(dev, "failed to get RESET GPIO\n");
                return PTR_ERR(panel->reset_gpio);
        }

        panel->base.prepare_prev_first = true;
        ret = drm_panel_of_backlight(&panel->base);
        if (ret)
                return ret;

        drm_panel_add(&panel->base);

        ret = mipi_dsi_attach(dsi);
        if (ret < 0) {
                dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
                drm_panel_remove(&panel->base);
                return ret;
        }

        return ret;
}

static void r63353_panel_remove(struct mipi_dsi_device *dsi)
{
        struct r63353_panel *rpanel = mipi_dsi_get_drvdata(dsi);
        struct device *dev = &dsi->dev;
        int ret;

        ret = mipi_dsi_detach(dsi);
        if (ret < 0)
                dev_err(dev, "Failed to detach from host (%d)\n", ret);

        drm_panel_remove(&rpanel->base);
}

static void r63353_panel_shutdown(struct mipi_dsi_device *dsi)
{
        struct r63353_panel *rpanel = mipi_dsi_get_drvdata(dsi);

        drm_panel_unprepare(&rpanel->base);
}

static const struct r63353_desc sharp_ls068b3sx02_data = {
        .name = "Sharp LS068B3SX02",
        .mode = &sharp_ls068b3sx02_timing,
        .init = sharp_ls068b3sx02_init,
        .init_length = ARRAY_SIZE(sharp_ls068b3sx02_init),
        .width_mm = 68,
        .height_mm = 159,
};

static const struct of_device_id r63353_of_match[] = {
        { .compatible = "sharp,ls068b3sx02", .data = &sharp_ls068b3sx02_data },
        { }
};

MODULE_DEVICE_TABLE(of, r63353_of_match);

static struct mipi_dsi_driver r63353_panel_driver = {
        .driver = {
                   .name = "r63353-dsi",
                   .of_match_table = r63353_of_match,
        },
        .probe = r63353_panel_probe,
        .remove = r63353_panel_remove,
        .shutdown = r63353_panel_shutdown,
};

module_mipi_dsi_driver(r63353_panel_driver);

MODULE_AUTHOR("Matthias Proske <Matthias.Proske@bshg.com>");
MODULE_AUTHOR("Michael Trimarchi <michael@amarulasolutions.com>");
MODULE_DESCRIPTION("Synaptics R63353 Controller Driver");
MODULE_LICENSE("GPL");