Contributors: 1
Author Tokens Token Proportion Commits Commit Proportion
Anton Bambura 847 100.00% 1 100.00%
Total 847 1 


// SPDX-License-Identifier: GPL-2.0-only

#include <linux/array_size.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>

#include <video/mipi_display.h>

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

struct samsung_ltl106hl02 {
	struct drm_panel panel;
	struct mipi_dsi_device *dsi;

	struct regulator *supply;
	struct gpio_desc *reset_gpio;
};

static inline struct samsung_ltl106hl02 *to_samsung_ltl106hl02(struct drm_panel *panel)
{
	return container_of(panel, struct samsung_ltl106hl02, panel);
}

static void samsung_ltl106hl02_reset(struct samsung_ltl106hl02 *ctx)
{
	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
	usleep_range(10000, 11000);
	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
	usleep_range(2000, 3000);
}

static int samsung_ltl106hl02_prepare(struct drm_panel *panel)
{
	struct samsung_ltl106hl02 *ctx = to_samsung_ltl106hl02(panel);
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };
	struct device *dev = &ctx->dsi->dev;
	int ret;

	ret = regulator_enable(ctx->supply);
	if (ret < 0) {
		dev_err(dev, "failed to enable power supply %d\n", ret);
		return ret;
	}

	if (ctx->reset_gpio)
		samsung_ltl106hl02_reset(ctx);

	mipi_dsi_dcs_exit_sleep_mode_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 70);

	mipi_dsi_dcs_set_display_on_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 5);

	return dsi_ctx.accum_err;
}

static int samsung_ltl106hl02_unprepare(struct drm_panel *panel)
{
	struct samsung_ltl106hl02 *ctx = to_samsung_ltl106hl02(panel);
	struct mipi_dsi_multi_context dsi_ctx = { .dsi = ctx->dsi };

	mipi_dsi_dcs_set_display_off_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 50);
	mipi_dsi_dcs_enter_sleep_mode_multi(&dsi_ctx);
	mipi_dsi_msleep(&dsi_ctx, 150);

	if (ctx->reset_gpio)
		gpiod_set_value_cansleep(ctx->reset_gpio, 1);

	regulator_disable(ctx->supply);

	return 0;
}

static const struct drm_display_mode samsung_ltl106hl02_mode = {
	.clock = (1920 + 32 + 32 + 64) * (1080 + 6 + 3 + 22) * 60 / 1000,
	.hdisplay = 1920,
	.hsync_start = 1920 + 32,
	.hsync_end = 1920 + 32 + 32,
	.htotal = 1920 + 32 + 32 + 64,
	.vdisplay = 1080,
	.vsync_start = 1080 + 6,
	.vsync_end = 1080 + 6 + 3,
	.vtotal = 1080 + 6 + 3 + 22,
	.width_mm = 235,
	.height_mm = 132,
	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
};

static int samsung_ltl106hl02_get_modes(struct drm_panel *panel,
					struct drm_connector *connector)
{
	return drm_connector_helper_get_modes_fixed(connector, &samsung_ltl106hl02_mode);
}

static const struct drm_panel_funcs samsung_ltl106hl02_panel_funcs = {
	.prepare = samsung_ltl106hl02_prepare,
	.unprepare = samsung_ltl106hl02_unprepare,
	.get_modes = samsung_ltl106hl02_get_modes,
};

static int samsung_ltl106hl02_probe(struct mipi_dsi_device *dsi)
{
	struct device *dev = &dsi->dev;
	struct samsung_ltl106hl02 *ctx;
	int ret;

	ctx = devm_drm_panel_alloc(dev, struct samsung_ltl106hl02, panel,
				   &samsung_ltl106hl02_panel_funcs,
				   DRM_MODE_CONNECTOR_DSI);
	if (IS_ERR(ctx))
		return PTR_ERR(ctx);

	ctx->supply = devm_regulator_get(dev, "power");
	if (IS_ERR(ctx->supply))
		return dev_err_probe(dev, PTR_ERR(ctx->supply),
				     "Failed to get power regulator\n");

	ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
	if (IS_ERR(ctx->reset_gpio))
		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
				     "Failed to get reset-gpios\n");

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

	dsi->lanes = 4;
	dsi->format = MIPI_DSI_FMT_RGB888;
	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM;

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

	drm_panel_add(&ctx->panel);

	ret = devm_mipi_dsi_attach(dev, dsi);
	if (ret < 0) {
		drm_panel_remove(&ctx->panel);
		return dev_err_probe(dev, ret, "Failed to attach to DSI host\n");
	}

	return 0;
}

static void samsung_ltl106hl02_remove(struct mipi_dsi_device *dsi)
{
	struct samsung_ltl106hl02 *ctx = mipi_dsi_get_drvdata(dsi);

	drm_panel_remove(&ctx->panel);
}

static const struct of_device_id samsung_ltl106hl02_of_match[] = {
	{ .compatible = "samsung,ltl106hl02-001" },
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, samsung_ltl106hl02_of_match);

static struct mipi_dsi_driver samsung_ltl106hl02_driver = {
	.driver = {
		.name = "panel-samsung-ltl106hl02",
		.of_match_table = samsung_ltl106hl02_of_match,
	},
	.probe = samsung_ltl106hl02_probe,
	.remove = samsung_ltl106hl02_remove,
};
module_mipi_dsi_driver(samsung_ltl106hl02_driver);

MODULE_AUTHOR("Anton Bambura <jenneron@protonmail.com>");
MODULE_DESCRIPTION("DRM driver for Samsung LTL106HL02 video mode DSI panel");
MODULE_LICENSE("GPL");