// SPDX-License-Identifier: GPL-2.0-only
/*
 * TDO Y17P TFT LCD drm_panel driver.
 *
 * SPI configured DPI display controller
 * Copyright (C) 2022 Raspberry Pi Ltd
 *
 * Derived from drivers/drm/gpu/panel/panel-sitronix-st7789v.c
 * Copyright (C) 2017 Free Electrons
 */

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

#include <linux/bitops.h>
#include <linux/gpio/consumer.h>
#include <linux/media-bus-format.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>

#include <video/mipi_display.h>
#include <video/of_videomode.h>
#include <video/videomode.h>

struct tdo_y17p {
	struct drm_panel panel;
	struct spi_device *spi;
	struct gpio_desc *reset;
	struct regulator *power;
	u32 bus_format;
};

static const u16 panel_init[] = {
	0x0ff, 0x1ff, 0x198, 0x106, 0x104, 0x101, 0x008, 0x110,
	0x021, 0x109, 0x030, 0x102, 0x031, 0x100, 0x040, 0x110,
	0x041, 0x155, 0x042, 0x102, 0x043, 0x109, 0x044, 0x107,
	0x050, 0x178, 0x051, 0x178, 0x052, 0x100, 0x053, 0x16d,
	0x060, 0x107, 0x061, 0x100, 0x062, 0x108, 0x063, 0x100,
	0x0a0, 0x100, 0x0a1, 0x107, 0x0a2, 0x10c, 0x0a3, 0x10b,
	0x0a4, 0x103, 0x0a5, 0x107, 0x0a6, 0x106, 0x0a7, 0x104,
	0x0a8, 0x108, 0x0a9, 0x10c, 0x0aa, 0x113, 0x0ab, 0x106,
	0x0ac, 0x10d, 0x0ad, 0x119, 0x0ae, 0x110, 0x0af, 0x100,
	0x0c0, 0x100, 0x0c1, 0x107, 0x0c2, 0x10c, 0x0c3, 0x10b,
	0x0c4, 0x103, 0x0c5, 0x107, 0x0c6, 0x107, 0x0c7, 0x104,
	0x0c8, 0x108, 0x0c9, 0x10c, 0x0ca, 0x113, 0x0cb, 0x106,
	0x0cc, 0x10d, 0x0cd, 0x118, 0x0ce, 0x110, 0x0cf, 0x100,
	0x0ff, 0x1ff, 0x198, 0x106, 0x104, 0x106, 0x000, 0x120,
	0x001, 0x10a, 0x002, 0x100, 0x003, 0x100, 0x004, 0x101,
	0x005, 0x101, 0x006, 0x198, 0x007, 0x106, 0x008, 0x101,
	0x009, 0x180, 0x00a, 0x100, 0x00b, 0x100, 0x00c, 0x101,
	0x00d, 0x101, 0x00e, 0x100, 0x00f, 0x100, 0x010, 0x1f0,
	0x011, 0x1f4, 0x012, 0x101, 0x013, 0x100, 0x014, 0x100,
	0x015, 0x1c0, 0x016, 0x108, 0x017, 0x100, 0x018, 0x100,
	0x019, 0x100, 0x01a, 0x100, 0x01b, 0x100, 0x01c, 0x100,
	0x01d, 0x100, 0x020, 0x101, 0x021, 0x123, 0x022, 0x145,
	0x023, 0x167, 0x024, 0x101, 0x025, 0x123, 0x026, 0x145,
	0x027, 0x167, 0x030, 0x111, 0x031, 0x111, 0x032, 0x100,
	0x033, 0x1ee, 0x034, 0x1ff, 0x035, 0x1bb, 0x036, 0x1aa,
	0x037, 0x1dd, 0x038, 0x1cc, 0x039, 0x166, 0x03a, 0x177,
	0x03b, 0x122, 0x03c, 0x122, 0x03d, 0x122, 0x03e, 0x122,
	0x03f, 0x122, 0x040, 0x122, 0x052, 0x110, 0x053, 0x110,
	0x0ff, 0x1ff, 0x198, 0x106, 0x104, 0x107, 0x018, 0x11d,
	0x017, 0x122, 0x002, 0x177, 0x026, 0x1b2, 0x0e1, 0x179,
	0x0ff, 0x1ff, 0x198, 0x106, 0x104, 0x100, 0x03a, 0x160,
	0x035, 0x100, 0x011, 0x100,
};

#define NUM_INIT_REGS ARRAY_SIZE(panel_init)

static inline struct tdo_y17p *panel_to_tdo_y17p(struct drm_panel *panel)
{
	return container_of(panel, struct tdo_y17p, panel);
}

static int tdo_y17p_write_msg(struct tdo_y17p *ctx, const u16 *msg, unsigned int len)
{
	struct spi_transfer xfer = { };
	struct spi_message spi;

	spi_message_init(&spi);

	xfer.tx_buf = msg;
	xfer.bits_per_word = 9;
	xfer.len = sizeof(u16) * len;

	spi_message_add_tail(&xfer, &spi);
	return spi_sync(ctx->spi, &spi);
}

static const struct drm_display_mode tdo_y17pe_720x720_mode = {
	.clock = 36720,
	.hdisplay = 720,
	.hsync_start = 720 + 20,
	.hsync_end = 720 + 20 + 20,
	.htotal = 720 + 20 + 20 + 40,
	.vdisplay = 720,
	.vsync_start = 720 + 15,
	.vsync_end = 720 + 15 + 15,
	.vtotal = 720 + 15 + 15 + 15,
	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
};

static int tdo_y17p_get_modes(struct drm_panel *panel,
			      struct drm_connector *connector)
{
	struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
	struct drm_display_mode *mode;

	mode = drm_mode_duplicate(connector->dev, &tdo_y17pe_720x720_mode);
	if (!mode) {
		dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
			tdo_y17pe_720x720_mode.hdisplay,
			tdo_y17pe_720x720_mode.vdisplay,
			drm_mode_vrefresh(&tdo_y17pe_720x720_mode));
		return -ENOMEM;
	}

	drm_mode_set_name(mode);

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

	connector->display_info.width_mm = 72;
	connector->display_info.height_mm = 72;
	drm_display_info_set_bus_formats(&connector->display_info,
					 &ctx->bus_format, 1);
	connector->display_info.bus_flags = 0;

	return 1;
}

static int tdo_y17p_prepare(struct drm_panel *panel)
{
	struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
	int ret;

	ret = regulator_enable(ctx->power);
	if (ret)
		return ret;

	ret = tdo_y17p_write_msg(ctx, panel_init, NUM_INIT_REGS);

	msleep(120);

	return ret;
}

static int tdo_y17p_enable(struct drm_panel *panel)
{
	struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
	const u16 msg[] = { MIPI_DCS_SET_DISPLAY_ON };
	int ret;

	ret = tdo_y17p_write_msg(ctx, msg, ARRAY_SIZE(msg));

	return ret;
}

static int tdo_y17p_disable(struct drm_panel *panel)
{
	struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
	const u16 msg[] = { MIPI_DCS_SET_DISPLAY_OFF };
	int ret;

	ret = tdo_y17p_write_msg(ctx, msg, ARRAY_SIZE(msg));

	return ret;
}

static int tdo_y17p_unprepare(struct drm_panel *panel)
{
	struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
	const u16 msg[] = { MIPI_DCS_ENTER_SLEEP_MODE };
	int ret;

	ret = tdo_y17p_write_msg(ctx, msg, ARRAY_SIZE(msg));

	return ret;
}

static const struct drm_panel_funcs tdo_y17p_drm_funcs = {
	.disable	= tdo_y17p_disable,
	.enable		= tdo_y17p_enable,
	.get_modes	= tdo_y17p_get_modes,
	.prepare	= tdo_y17p_prepare,
	.unprepare	= tdo_y17p_unprepare,
};

static const struct of_device_id tdo_y17p_of_match[] = {
	{	.compatible = "tdo,tl040hds20ct",
		.data = (void *)MEDIA_BUS_FMT_BGR888_1X24,
	}, {
		.compatible = "pimoroni,hyperpixel4square",
		.data = (void *)MEDIA_BUS_FMT_BGR666_1X24_CPADHI,
	}, {
		.compatible = "tdo,y17p",
		.data = (void *)MEDIA_BUS_FMT_BGR888_1X24,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(of, tdo_y17p_of_match);

static int tdo_y17p_probe(struct spi_device *spi)
{
	const struct of_device_id *id;
	struct tdo_y17p *ctx;
	int ret;

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

	id = of_match_node(tdo_y17p_of_match, spi->dev.of_node);
	if (!id)
		return -ENODEV;

	ctx->bus_format = (u32)(uintptr_t)id->data;

	spi_set_drvdata(spi, ctx);
	ctx->spi = spi;

	drm_panel_init(&ctx->panel, &spi->dev, &tdo_y17p_drm_funcs,
		       DRM_MODE_CONNECTOR_DPI);

	ctx->power = devm_regulator_get(&spi->dev, "power");
	if (IS_ERR(ctx->power))
		return PTR_ERR(ctx->power);

	ctx->reset = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(ctx->reset)) {
		dev_err(&spi->dev, "Couldn't get our reset line\n");
		return PTR_ERR(ctx->reset);
	}

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

	drm_panel_add(&ctx->panel);

	return 0;
}

static void tdo_y17p_remove(struct spi_device *spi)
{
	struct tdo_y17p *ctx = spi_get_drvdata(spi);

	drm_panel_remove(&ctx->panel);
}

static const struct spi_device_id tdo_y17p_ids[] = {
	{ "tl040hds20ct", 0 },
	{ "hyperpixel4square", 0 },
	{ "y17p", 0 },
	{ /* sentinel */ }
};

MODULE_DEVICE_TABLE(spi, tdo_y17p_ids);

static struct spi_driver tdo_y17p_driver = {
	.probe = tdo_y17p_probe,
	.remove = tdo_y17p_remove,
	.driver = {
		.name = "tdo_y17p",
		.of_match_table = tdo_y17p_of_match,
	},
	.id_table = tdo_y17p_ids,
};
module_spi_driver(tdo_y17p_driver);

MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com>");
MODULE_DESCRIPTION("TDO Y17P LCD panel driver");
MODULE_LICENSE("GPL v2");