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// 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 const 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");
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