lcd_ams_delta.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Based on drivers/video/omap/lcd_inn1510.c
  4 *
  5 * LCD panel support for the Amstrad E3 (Delta) videophone.
  6 *
  7 * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
  8 */
  9
 10#include <linux/module.h>
 11#include <linux/platform_device.h>
 12#include <linux/io.h>
 13#include <linux/delay.h>
 14#include <linux/gpio/consumer.h>
 15#include <linux/lcd.h>
 16
 17#include <linux/soc/ti/omap1-io.h>
 18
 19#include "omapfb.h"
 20
 21#define AMS_DELTA_DEFAULT_CONTRAST	112
 22
 23#define AMS_DELTA_MAX_CONTRAST		0x00FF
 24#define AMS_DELTA_LCD_POWER		0x0100
 25
 26
 27/* LCD class device section */
 28
 29static int ams_delta_lcd;
 30static struct gpio_desc *gpiod_vblen;
 31static struct gpio_desc *gpiod_ndisp;
 32
 33static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
 34{
 35	if (power == LCD_POWER_ON) {
 36		if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
 37			omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
 38					OMAP_PWL_ENABLE);
 39			omap_writeb(1, OMAP_PWL_CLK_ENABLE);
 40			ams_delta_lcd |= AMS_DELTA_LCD_POWER;
 41		}
 42	} else {
 43		if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
 44			omap_writeb(0, OMAP_PWL_ENABLE);
 45			omap_writeb(0, OMAP_PWL_CLK_ENABLE);
 46			ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
 47		}
 48	}
 49	return 0;
 50}
 51
 52static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
 53{
 54	if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
 55		omap_writeb(value, OMAP_PWL_ENABLE);
 56		ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
 57		ams_delta_lcd |= value;
 58	}
 59	return 0;
 60}
 61
 62#ifdef CONFIG_LCD_CLASS_DEVICE
 63static int ams_delta_lcd_get_power(struct lcd_device *dev)
 64{
 65	if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
 66		return LCD_POWER_ON;
 67	else
 68		return LCD_POWER_OFF;
 69}
 70
 71static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
 72{
 73	if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
 74		return 0;
 75
 76	return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
 77}
 78
 79static const struct lcd_ops ams_delta_lcd_ops = {
 80	.get_power = ams_delta_lcd_get_power,
 81	.set_power = ams_delta_lcd_set_power,
 82	.get_contrast = ams_delta_lcd_get_contrast,
 83	.set_contrast = ams_delta_lcd_set_contrast,
 84};
 85#endif
 86
 87
 88/* omapfb panel section */
 89
 90static int ams_delta_panel_enable(struct lcd_panel *panel)
 91{
 92	gpiod_set_value(gpiod_ndisp, 1);
 93	gpiod_set_value(gpiod_vblen, 1);
 94	return 0;
 95}
 96
 97static void ams_delta_panel_disable(struct lcd_panel *panel)
 98{
 99	gpiod_set_value(gpiod_vblen, 0);
100	gpiod_set_value(gpiod_ndisp, 0);
101}
102
103static struct lcd_panel ams_delta_panel = {
104	.name		= "ams-delta",
105	.config		= 0,
106
107	.bpp		= 12,
108	.data_lines	= 16,
109	.x_res		= 480,
110	.y_res		= 320,
111	.pixel_clock	= 4687,
112	.hsw		= 3,
113	.hfp		= 1,
114	.hbp		= 1,
115	.vsw		= 1,
116	.vfp		= 0,
117	.vbp		= 0,
118	.pcd		= 0,
119	.acb		= 37,
120
121	.enable		= ams_delta_panel_enable,
122	.disable	= ams_delta_panel_disable,
123};
124
125
126/* platform driver section */
127
128static int ams_delta_panel_probe(struct platform_device *pdev)
129{
130	struct lcd_device *lcd_device = NULL;
131
132	gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
133	if (IS_ERR(gpiod_vblen))
134		return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_vblen),
135				     "VBLEN GPIO request failed\n");
136
137	gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW);
138	if (IS_ERR(gpiod_ndisp))
139		return dev_err_probe(&pdev->dev, PTR_ERR(gpiod_ndisp),
140				     "NDISP GPIO request failed\n");
141
142#ifdef CONFIG_LCD_CLASS_DEVICE
143	lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
144						&ams_delta_lcd_ops);
145
146	if (IS_ERR(lcd_device)) {
147		int ret = PTR_ERR(lcd_device);
148
149		dev_err(&pdev->dev, "failed to register device\n");
150		return ret;
151	}
152
153	platform_set_drvdata(pdev, lcd_device);
154	lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
155#endif
156
157	ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
158	ams_delta_lcd_set_power(lcd_device, LCD_POWER_ON);
159
160	omapfb_register_panel(&ams_delta_panel);
161	return 0;
162}
163
164static struct platform_driver ams_delta_panel_driver = {
165	.probe		= ams_delta_panel_probe,
166	.driver		= {
167		.name	= "lcd_ams_delta",
168	},
169};
170
171module_platform_driver(ams_delta_panel_driver);
172
173MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
174MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone");
175MODULE_LICENSE("GPL");