1 files changed, 175 insertions, 0 deletions
diff --git a/drivers/video/fbdev/omap/lcd_ams_delta.c b/drivers/video/fbdev/omap/lcd_ams_delta.c
new file mode 100644
index 000000000..6f860c814
--- /dev/null
+++ b/drivers/video/fbdev/omap/lcd_ams_delta.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Based on drivers/video/omap/lcd_inn1510.c
+ *
+ * LCD panel support for the Amstrad E3 (Delta) videophone.
+ *
+ * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/lcd.h>
+
+#include <linux/soc/ti/omap1-io.h>
+
+#include "omapfb.h"
+
+#define AMS_DELTA_DEFAULT_CONTRAST	112
+
+#define AMS_DELTA_MAX_CONTRAST		0x00FF
+#define AMS_DELTA_LCD_POWER		0x0100
+
+
+/* LCD class device section */
+
+static int ams_delta_lcd;
+static struct gpio_desc *gpiod_vblen;
+static struct gpio_desc *gpiod_ndisp;
+
+static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
+{
+	if (power == FB_BLANK_UNBLANK) {
+		if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
+			omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
+					OMAP_PWL_ENABLE);
+			omap_writeb(1, OMAP_PWL_CLK_ENABLE);
+			ams_delta_lcd |= AMS_DELTA_LCD_POWER;
+		}
+	} else {
+		if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
+			omap_writeb(0, OMAP_PWL_ENABLE);
+			omap_writeb(0, OMAP_PWL_CLK_ENABLE);
+			ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
+		}
+	}
+	return 0;
+}
+
+static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
+{
+	if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
+		omap_writeb(value, OMAP_PWL_ENABLE);
+		ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
+		ams_delta_lcd |= value;
+	}
+	return 0;
+}
+
+#ifdef CONFIG_LCD_CLASS_DEVICE
+static int ams_delta_lcd_get_power(struct lcd_device *dev)
+{
+	if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
+		return FB_BLANK_UNBLANK;
+	else
+		return FB_BLANK_POWERDOWN;
+}
+
+static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
+{
+	if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
+		return 0;
+
+	return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
+}
+
+static struct lcd_ops ams_delta_lcd_ops = {
+	.get_power = ams_delta_lcd_get_power,
+	.set_power = ams_delta_lcd_set_power,
+	.get_contrast = ams_delta_lcd_get_contrast,
+	.set_contrast = ams_delta_lcd_set_contrast,
+};
+#endif
+
+
+/* omapfb panel section */
+
+static int ams_delta_panel_enable(struct lcd_panel *panel)
+{
+	gpiod_set_value(gpiod_ndisp, 1);
+	gpiod_set_value(gpiod_vblen, 1);
+	return 0;
+}
+
+static void ams_delta_panel_disable(struct lcd_panel *panel)
+{
+	gpiod_set_value(gpiod_vblen, 0);
+	gpiod_set_value(gpiod_ndisp, 0);
+}
+
+static struct lcd_panel ams_delta_panel = {
+	.name		= "ams-delta",
+	.config		= 0,
+
+	.bpp		= 12,
+	.data_lines	= 16,
+	.x_res		= 480,
+	.y_res		= 320,
+	.pixel_clock	= 4687,
+	.hsw		= 3,
+	.hfp		= 1,
+	.hbp		= 1,
+	.vsw		= 1,
+	.vfp		= 0,
+	.vbp		= 0,
+	.pcd		= 0,
+	.acb		= 37,
+
+	.enable		= ams_delta_panel_enable,
+	.disable	= ams_delta_panel_disable,
+};
+
+
+/* platform driver section */
+
+static int ams_delta_panel_probe(struct platform_device *pdev)
+{
+	struct lcd_device *lcd_device = NULL;
+
+	gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
+	if (IS_ERR(gpiod_vblen))
+		return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_vblen),
+				     "VBLEN GPIO request failed\n");
+
+	gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW);
+	if (IS_ERR(gpiod_ndisp))
+		return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_ndisp),
+				     "NDISP GPIO request failed\n");
+
+#ifdef CONFIG_LCD_CLASS_DEVICE
+	lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
+						&ams_delta_lcd_ops);
+
+	if (IS_ERR(lcd_device)) {
+		int ret = PTR_ERR(lcd_device);
+
+		dev_err(&pdev->dev, "failed to register device\n");
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, lcd_device);
+	lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
+#endif
+
+	ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
+	ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
+
+	omapfb_register_panel(&ams_delta_panel);
+	return 0;
+}
+
+static struct platform_driver ams_delta_panel_driver = {
+	.probe		= ams_delta_panel_probe,
+	.driver		= {
+		.name	= "lcd_ams_delta",
+	},
+};
+
+module_platform_driver(ams_delta_panel_driver);
+
+MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
+MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone");
+MODULE_LICENSE("GPL");