// SPDX-License-Identifier: GPL-2.0+
/*
 * This file based on panel-ilitek-ili9881c.c
 */

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

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

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

enum ili9881c_op {
	ILI9881C_SWITCH_PAGE,
	ILI9881C_COMMAND,
};

struct ili9881c_instr {
	enum ili9881c_op	op;

	union arg {
		struct cmd {
			u8	cmd;
			u8	data;
		} cmd;
		u8	page;
	} arg;
};

#define ILI9881C_SWITCH_PAGE_INSTR(_page)	\
	{					\
		.op = ILI9881C_SWITCH_PAGE,	\
		.arg = {			\
			.page = (_page),	\
		},				\
	}

#define ILI9881C_COMMAND_INSTR(_cmd, _data)		\
	{						\
		.op = ILI9881C_COMMAND,		\
		.arg = {				\
			.cmd = {			\
				.cmd = (_cmd),		\
				.data = (_data),	\
			},				\
		},					\
	}

static const struct ili9881c_instr ili9881c_init[] = {
	ILI9881C_COMMAND_INSTR(0xB2, 0x50),
	ILI9881C_COMMAND_INSTR(0x80, 0x8B),
	ILI9881C_COMMAND_INSTR(0x81, 0x78),
	ILI9881C_COMMAND_INSTR(0x82, 0x84),
	ILI9881C_COMMAND_INSTR(0x83, 0x88),
	ILI9881C_COMMAND_INSTR(0x84, 0xA8),
	ILI9881C_COMMAND_INSTR(0x85, 0xE3),
	ILI9881C_COMMAND_INSTR(0x86, 0x88)
};

/*
 * The panel seems to accept some private DCS commands that map
 * directly to registers.
 *
 * It is organised by page, with each page having its own set of
 * registers, and the first page looks like it's holding the standard
 * DCS commands.
 *
 * So before any attempt at sending a command or data, we have to be
 * sure if we're in the right page or not.
 */
static int ili9881c_switch_page(struct ili9881c *ctx, u8 page)
{
	u8 buf[4] = { 0xff, 0x98, 0x81, page };
	int ret;

	ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
	if (ret < 0)
		return ret;

	return 0;
}

static int ili9881c_send_cmd_data(struct ili9881c *ctx, u8 cmd, u8 data)
{
	u8 buf[2] = { cmd, data };
	int ret;

	ret = mipi_dsi_dcs_write_buffer(ctx->dsi, buf, sizeof(buf));
	if (ret < 0)
		return ret;

	return 0;
}

struct rb070d30_panel {
	struct drm_panel panel;
	struct mipi_dsi_device *dsi;
	//struct backlight_device *backlight;
	//struct regulator *supply;

	struct {
		//struct gpio_desc *power;
		struct gpio_desc *reset;
		//struct gpio_desc *updn;
		//struct gpio_desc *shlr;
	} gpios;
};

static inline struct rb070d30_panel *panel_to_rb070d30_panel(struct drm_panel *panel)
{
	return container_of(panel, struct rb070d30_panel, panel);
}

static int rb070d30_panel_prepare(struct drm_panel *panel)
{
	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
	int ret;

	/*
	ret = regulator_enable(ctx->supply);
	if (ret < 0) {
		DRM_DEV_ERROR(&ctx->dsi->dev, "Failed to enable supply: %d\n", ret);
		return ret;
	}
	*/

	//msleep(20);
	//gpiod_set_value(ctx->gpios.power, 1);
	msleep(20);
	gpiod_set_value(ctx->gpios.reset, 0);
	msleep(20);
	gpiod_set_value(ctx->gpios.reset, 1);
	msleep(20);



	for (i = 0; i < ARRAY_SIZE(ili9881c_init); i++) {
		const struct ili9881c_instr *instr = &ili9881c_init[i];

		if (instr->op == ILI9881C_SWITCH_PAGE)
			ret = ili9881c_switch_page(ctx, instr->arg.page);
		else if (instr->op == ILI9881C_COMMAND)
			ret = ili9881c_send_cmd_data(ctx, instr->arg.cmd.cmd,
						      instr->arg.cmd.data);

		if (ret)
			return ret;
	}




	return 0;
}

static int rb070d30_panel_unprepare(struct drm_panel *panel)
{
	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);

	gpiod_set_value(ctx->gpios.reset, 0);
	//gpiod_set_value(ctx->gpios.power, 0);
	//regulator_disable(ctx->supply);

	return 0;
}

static int rb070d30_panel_enable(struct drm_panel *panel)
{
	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
	int ret;

	ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi);
	if (ret)
		return ret;

	/*
	ret = backlight_enable(ctx->backlight);
	if (ret)
		goto out;
	*/

	return 0;

//out:
	//mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
	//return ret;
}

static int rb070d30_panel_disable(struct drm_panel *panel)
{
	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);

	//backlight_disable(ctx->backlight);
	return mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
}

/* Default timings */
static const struct drm_display_mode default_mode = {
	.clock		= 51206,
	.hdisplay	= 1024,
	.hsync_start	= 1024 + 160,
	.hsync_end	= 1024 + 160 + 80,
	.htotal		= 1024 + 160 + 80 + 80,
	.vdisplay	= 600,
	.vsync_start	= 600 + 12,
	.vsync_end	= 600 + 12 + 10,
	.vtotal		= 600 + 12 + 10 + 13,
	.vrefresh	= 60,

	.width_mm	= 154,
	.height_mm	= 85,
};

static int rb070d30_panel_get_modes(struct drm_panel *panel)
{
	struct drm_connector *connector = panel->connector;
	struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel);
	struct drm_display_mode *mode;
	static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;

	mode = drm_mode_duplicate(panel->drm, &default_mode);
	if (!mode) {
		DRM_DEV_ERROR(&ctx->dsi->dev,
			      "Failed to add mode " DRM_MODE_FMT "\n",
			      DRM_MODE_ARG(&default_mode));
		return -EINVAL;
	}

	drm_mode_set_name(mode);

	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
	drm_mode_probed_add(connector, mode);

	panel->connector->display_info.bpc = 8;
	panel->connector->display_info.width_mm = mode->width_mm;
	panel->connector->display_info.height_mm = mode->height_mm;
	drm_display_info_set_bus_formats(&connector->display_info,
					 &bus_format, 1);

	return 1;
}

static const struct drm_panel_funcs rb070d30_panel_funcs = {
	.get_modes	= rb070d30_panel_get_modes,
	.prepare	= rb070d30_panel_prepare,
	.enable		= rb070d30_panel_enable,
	.disable	= rb070d30_panel_disable,
	.unprepare	= rb070d30_panel_unprepare,
};

static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi)
{
	struct rb070d30_panel *ctx;
	int ret;

	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
		return -ENOMEM;

	/*
	ctx->supply = devm_regulator_get(&dsi->dev, "vcc-lcd");
	if (IS_ERR(ctx->supply))
		return PTR_ERR(ctx->supply);
	*/

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

	drm_panel_init(&ctx->panel, &dsi->dev, &rb070d30_panel_funcs,
		       DRM_MODE_CONNECTOR_DSI);

	ctx->gpios.reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(ctx->gpios.reset)) {
		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
		return PTR_ERR(ctx->gpios.reset);
	}

	/*
	ctx->gpios.power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW);
	if (IS_ERR(ctx->gpios.power)) {
		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our power GPIO\n");
		return PTR_ERR(ctx->gpios.power);
	}
	*/

	/*
	 * We don't change the state of that GPIO later on but we need
	 * to force it into a low state.
	 */
	/*
	ctx->gpios.updn = devm_gpiod_get(&dsi->dev, "updn", GPIOD_OUT_LOW);
	if (IS_ERR(ctx->gpios.updn)) {
		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our updn GPIO\n");
		return PTR_ERR(ctx->gpios.updn);
	}*/

	/*
	 * We don't change the state of that GPIO later on but we need
	 * to force it into a low state.
	 */
	/*
	ctx->gpios.shlr = devm_gpiod_get(&dsi->dev, "shlr", GPIOD_OUT_LOW);
	if (IS_ERR(ctx->gpios.shlr)) {
		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our shlr GPIO\n");
		return PTR_ERR(ctx->gpios.shlr);
	}

	ctx->backlight = devm_of_find_backlight(&dsi->dev);
	if (IS_ERR(ctx->backlight)) {
		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our backlight\n");
		return PTR_ERR(ctx->backlight);
	}*/

	ret = drm_panel_add(&ctx->panel);
	if (ret < 0)
		return ret;

	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM;
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->lanes = 2;

	return mipi_dsi_attach(dsi);
}

static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi)
{
	struct rb070d30_panel *ctx = mipi_dsi_get_drvdata(dsi);

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

	return 0;
}

static const struct of_device_id rb070d30_panel_of_match[] = {
	{ .compatible = "dmb,rb070d30" },
	{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, rb070d30_panel_of_match);

static struct mipi_dsi_driver rb070d30_panel_driver = {
	.probe = rb070d30_panel_dsi_probe,
	.remove = rb070d30_panel_dsi_remove,
	.driver = {
		.name = "panel-dmb-rb070d30",
		.of_match_table	= rb070d30_panel_of_match,
	},
};
module_mipi_dsi_driver(rb070d30_panel_driver);


MODULE_LICENSE("GPL");