// SPDX-License-Identifier: GPL-2.0-only
/*
 * DRM driver for Renesas R63419 based dual-DSI video mode panels
 *
 * Copyright (c) 2025, Kancy Joe <kancy2333@outlook.com>
 * Copyright (C) 2026 Linaro Limited
 * Author: Neil Armstrong <neil.armstrong@linaro.org>
 */

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

#include <video/mipi_display.h>

#include <drm/drm_connector.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>

struct renesas_r63419_panel {
	struct drm_panel panel;
	struct mipi_dsi_device *dsi[2];
	const struct panel_desc *desc;

	struct gpio_desc *reset_gpio;
	struct regulator_bulk_data *vdd_supplies;
	struct regulator_bulk_data *vcc_supplies;
	enum drm_panel_orientation orientation;
};

/* VDDIO/VDD Supplies */
static const struct regulator_bulk_data renesas_r63419_vdd_supplies[] = {
	{ .supply = "vddio" },
	{ .supply = "vdd" },
};

/* VSP/VSN/VCI Supplies */
static const struct regulator_bulk_data renesas_r63419_vcc_supplies[] = {
	{ .supply = "vsp" },
	{ .supply = "vsn" },
	{ .supply = "vci" },
};

struct panel_desc {
	const struct drm_display_mode *mode;
	unsigned int lanes;
	unsigned long mode_flags;
	enum mipi_dsi_pixel_format format;
	const struct mipi_dsi_device_info dsi_info;
};

static const struct drm_display_mode wt0600_mode = {
	/* Dual dsi */
	.clock = 2 * (720 + 100 + 8 + 40) * (2560 + 15 + 2 + 8) * 60 / 1000,
	.hdisplay = 2 * 720,
	.hsync_start = 2 * (720 + 100),
	.hsync_end = 2 * (720 + 100 + 8),
	.htotal = 2 * (720 + 100 + 8 + 40),
	.vdisplay = 2560,
	.vsync_start = 2560 + 15,
	.vsync_end = 2560 + 15 + 2,
	.vtotal = 2560 + 15 + 2 + 8,
	.type = DRM_MODE_TYPE_DRIVER,
	.width_mm = 74,
	.height_mm = 131,
};

static const struct drm_display_mode wt0630_mode = {
	/* Dual dsi */
	.clock = 2 * (720 + 100 + 8 + 40) * (2560 + 15 + 2 + 8) * 60 / 1000,
	.hdisplay = 2 * 720,
	.hsync_start = 2 * (720 + 100),
	.hsync_end = 2 * (720 + 100 + 8),
	.htotal = 2 * (720 + 100 + 8 + 40),
	.vdisplay = 2560,
	.vsync_start = 2560 + 15,
	.vsync_end = 2560 + 15 + 2,
	.vtotal = 2560 + 15 + 2 + 8,
	.type = DRM_MODE_TYPE_DRIVER,
	.width_mm = 78,
	.height_mm = 140,
};

static struct panel_desc wt0600_desc = {
	.lanes = 4,
	.mode = &wt0600_mode,
	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
		      MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM,
	.format = MIPI_DSI_FMT_RGB888,
};

static struct panel_desc wt0630_desc = {
	.lanes = 4,
	.mode = &wt0630_mode,  /* wt0600 only has different screen size */
	.mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
		      MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM,
	.format = MIPI_DSI_FMT_RGB888,
};

static inline struct renesas_r63419_panel *
to_renesas_r63419_panel(struct drm_panel *panel)
{
	return container_of(panel, struct renesas_r63419_panel, panel);
}

static int renesas_r63419_on(struct renesas_r63419_panel *ctx)
{
	struct mipi_dsi_multi_context dsi_ctx = { 0 };

	/*
	 * Panel registers are loaded from DDIC Non Volatile Memory
	 *
	 * The DDIC expects this sequence to get out of sleep and enable display
	 */

	mipi_dsi_dual(mipi_dsi_dcs_set_display_on_multi,
		      &dsi_ctx, ctx->dsi[0], ctx->dsi[1]);
	mipi_dsi_msleep(&dsi_ctx, 50);

	mipi_dsi_dual(mipi_dsi_dcs_exit_sleep_mode_multi,
		      &dsi_ctx, ctx->dsi[0], ctx->dsi[1]);
	mipi_dsi_msleep(&dsi_ctx, 150);

	return dsi_ctx.accum_err;
}

static int renesas_r63419_disable(struct drm_panel *panel)
{
	struct renesas_r63419_panel *ctx = to_renesas_r63419_panel(panel);
	struct mipi_dsi_multi_context dsi_ctx = { 0 };

	mipi_dsi_dual(mipi_dsi_dcs_set_display_off_multi,
		      &dsi_ctx, ctx->dsi[0], ctx->dsi[1]);
	mipi_dsi_msleep(&dsi_ctx, 50);

	mipi_dsi_dual(mipi_dsi_dcs_enter_sleep_mode_multi,
		      &dsi_ctx, ctx->dsi[0], ctx->dsi[1]);
	mipi_dsi_msleep(&dsi_ctx, 120);

	return 0;
}

static int renesas_r63419_prepare(struct drm_panel *panel)
{
	struct renesas_r63419_panel *ctx = to_renesas_r63419_panel(panel);
	int ret;

	ret = regulator_bulk_enable(ARRAY_SIZE(renesas_r63419_vdd_supplies),
				    ctx->vdd_supplies);
	if (ret < 0)
		return ret;

	usleep_range(1000, 2000);

	ret = regulator_bulk_enable(ARRAY_SIZE(renesas_r63419_vcc_supplies),
				    ctx->vcc_supplies);
	if (ret < 0) {
		regulator_bulk_disable(ARRAY_SIZE(renesas_r63419_vdd_supplies),
				       ctx->vdd_supplies);
		return ret;
	}

	usleep_range(1000, 2000);

	gpiod_set_value_cansleep(ctx->reset_gpio, 0);

	usleep_range(3000, 4000);

	ret = renesas_r63419_on(ctx);
	if (ret < 0) {
		dev_err(panel->dev, "Failed to initialize panel: %d\n", ret);

		/* Power off sequence from the r63419 datasheet */
		regulator_bulk_disable(ARRAY_SIZE(renesas_r63419_vdd_supplies),
				       ctx->vdd_supplies);

		gpiod_set_value_cansleep(ctx->reset_gpio, 1);

		regulator_bulk_disable(ARRAY_SIZE(renesas_r63419_vcc_supplies),
				       ctx->vcc_supplies);

		return ret;
	}

	return 0;
}

static int renesas_r63419_unprepare(struct drm_panel *panel)
{
	struct renesas_r63419_panel *ctx = to_renesas_r63419_panel(panel);

	/* Power off sequence from the r63419 datasheet */
	regulator_bulk_disable(ARRAY_SIZE(renesas_r63419_vdd_supplies), ctx->vdd_supplies);

	gpiod_set_value_cansleep(ctx->reset_gpio, 1);

	regulator_bulk_disable(ARRAY_SIZE(renesas_r63419_vcc_supplies), ctx->vcc_supplies);

	return 0;
}

static int renesas_r63419_get_modes(struct drm_panel *panel,
				    struct drm_connector *connector)
{
	struct renesas_r63419_panel *ctx = to_renesas_r63419_panel(panel);
	const struct drm_display_mode *mode = ctx->desc->mode;

	return drm_connector_helper_get_modes_fixed(connector, mode);
}

static enum drm_panel_orientation
renesas_r63419_get_orientation(struct drm_panel *panel)
{
	struct renesas_r63419_panel *ctx = to_renesas_r63419_panel(panel);

	return ctx->orientation;
}

static const struct drm_panel_funcs renesas_r63419_panel_funcs = {
	.disable = renesas_r63419_disable,
	.prepare = renesas_r63419_prepare,
	.unprepare = renesas_r63419_unprepare,
	.get_modes = renesas_r63419_get_modes,
	.get_orientation = renesas_r63419_get_orientation,
};

static int renesas_r63419_probe(struct mipi_dsi_device *dsi)
{
	struct mipi_dsi_device_info info = { 0 };
	struct device *dev = &dsi->dev;
	struct renesas_r63419_panel *ctx;
	struct device_node *dsi1_node;
	struct mipi_dsi_host *dsi1_host;
	int ret, i;

	ctx = devm_drm_panel_alloc(dev, struct renesas_r63419_panel, panel,
				   &renesas_r63419_panel_funcs, DRM_MODE_CONNECTOR_DSI);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);

	ctx->desc = of_device_get_match_data(dev);
	if (!ctx->desc)
		return dev_err_probe(dev, -ENODEV,
				     "Failed to get panel description\n");

	ret = devm_regulator_bulk_get_const(&dsi->dev,
					    ARRAY_SIZE(renesas_r63419_vdd_supplies),
					    renesas_r63419_vdd_supplies, &ctx->vdd_supplies);
	if (ret < 0)
		return ret;

	ret = devm_regulator_bulk_get_const(&dsi->dev,
					    ARRAY_SIZE(renesas_r63419_vcc_supplies),
					    renesas_r63419_vcc_supplies, &ctx->vcc_supplies);
	if (ret < 0)
		return ret;

	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
	if (IS_ERR(ctx->reset_gpio))
		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
				     "Failed to get reset gpio\n");

	/* Get second DSI host */
	dsi1_node = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
	if (!dsi1_node)
		return dev_err_probe(dev, -ENODEV,
				     "Failed to get remote node for second DSI\n");

	dsi1_host = of_find_mipi_dsi_host_by_node(dsi1_node);
	of_node_put(dsi1_node);
	if (!dsi1_host)
		return dev_err_probe(dev, -EPROBE_DEFER,
				     "Failed to find second DSI host\n");

	/* Copy current DSI info, do not provide OF node since no driver needs to be attached */
	strscpy(info.type, dsi->name);
	info.channel = dsi->channel;

	/* Register the second DSI device */
	ctx->dsi[1] = devm_mipi_dsi_device_register_full(dev, dsi1_host, &info);
	if (IS_ERR(ctx->dsi[1]))
		return dev_err_probe(dev, PTR_ERR(ctx->dsi[1]),
				     "Failed to register second DSI device\n");

	ctx->dsi[0] = dsi;
	mipi_dsi_set_drvdata(dsi, ctx);

	/* Get panel orientation */
	ret = drm_of_get_panel_orientation(dev->of_node, &ctx->orientation);
	if (ret < 0 && ret != -ENODEV)
		return dev_err_probe(dev, ret,
				     "Failed to get panel orientation\n");

	ctx->panel.prepare_prev_first = true;

	ret = drm_panel_of_backlight(&ctx->panel);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to get backlight\n");

	ret = devm_drm_panel_add(dev, &ctx->panel);
	if (ret)
		return dev_err_probe(dev, ret, "Failed to add panel\n");

	/* Configure and attach both DSI devices */
	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
		ctx->dsi[i]->lanes = ctx->desc->lanes;
		ctx->dsi[i]->format = ctx->desc->format;
		ctx->dsi[i]->mode_flags = ctx->desc->mode_flags;

		ret = devm_mipi_dsi_attach(dev, ctx->dsi[i]);
		if (ret < 0)
			return dev_err_probe(dev, ret,
					     "Failed to attach DSI device %d\n", i);
	}

	return 0;
}

static const struct of_device_id renesas_r63419_of_match[] = {
	{
		.compatible = "ayaneo,wt0600-2k",
		.data = &wt0600_desc,
	},
	{
		.compatible = "ayaneo,wt0630-2k",
		.data = &wt0630_desc,
	},
	{}
};
MODULE_DEVICE_TABLE(of, renesas_r63419_of_match);

static struct mipi_dsi_driver renesas_r63419_driver = {
	.probe = renesas_r63419_probe,
	.driver = {
		.name = "panel-renesas-r63419",
		.of_match_table = renesas_r63419_of_match,
	},
};
module_mipi_dsi_driver(renesas_r63419_driver);

MODULE_AUTHOR("Kancy Joe <kancy2333@outlook.com>");
MODULE_AUTHOR("Neil Armstrong <neil.armstrong@linaro.org>");
MODULE_DESCRIPTION("DRM driver for Renesas R63419 based dual-DSI video mode panels");
MODULE_LICENSE("GPL");