1/*
2 * Based on drivers/video/omap/lcd_inn1510.c
3 *
4 * LCD panel support for the Amstrad E3 (Delta) videophone.
5 *
6 * Copyright (C) 2006 Jonathan McDowell <noodles@earth.li>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
21 */
22
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/io.h>
26#include <linux/delay.h>
27#include <linux/lcd.h>
28#include <linux/gpio.h>
29
30#include <mach/hardware.h>
31#include <mach/board-ams-delta.h>
32
33#include "omapfb.h"
34
35#define AMS_DELTA_DEFAULT_CONTRAST	112
36
37#define AMS_DELTA_MAX_CONTRAST		0x00FF
38#define AMS_DELTA_LCD_POWER		0x0100
39
40
41/* LCD class device section */
42
43static int ams_delta_lcd;
44
45static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
46{
47	if (power == FB_BLANK_UNBLANK) {
48		if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER)) {
49			omap_writeb(ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
50					OMAP_PWL_ENABLE);
51			omap_writeb(1, OMAP_PWL_CLK_ENABLE);
52			ams_delta_lcd |= AMS_DELTA_LCD_POWER;
53		}
54	} else {
55		if (ams_delta_lcd & AMS_DELTA_LCD_POWER) {
56			omap_writeb(0, OMAP_PWL_ENABLE);
57			omap_writeb(0, OMAP_PWL_CLK_ENABLE);
58			ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
59		}
60	}
61	return 0;
62}
63
64static int ams_delta_lcd_set_contrast(struct lcd_device *dev, int value)
65{
66	if ((value >= 0) && (value <= AMS_DELTA_MAX_CONTRAST)) {
67		omap_writeb(value, OMAP_PWL_ENABLE);
68		ams_delta_lcd &= ~AMS_DELTA_MAX_CONTRAST;
69		ams_delta_lcd |= value;
70	}
71	return 0;
72}
73
74#ifdef CONFIG_LCD_CLASS_DEVICE
75static int ams_delta_lcd_get_power(struct lcd_device *dev)
76{
77	if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
78		return FB_BLANK_UNBLANK;
79	else
80		return FB_BLANK_POWERDOWN;
81}
82
83static int ams_delta_lcd_get_contrast(struct lcd_device *dev)
84{
85	if (!(ams_delta_lcd & AMS_DELTA_LCD_POWER))
86		return 0;
87
88	return ams_delta_lcd & AMS_DELTA_MAX_CONTRAST;
89}
90
91static struct lcd_ops ams_delta_lcd_ops = {
92	.get_power = ams_delta_lcd_get_power,
93	.set_power = ams_delta_lcd_set_power,
94	.get_contrast = ams_delta_lcd_get_contrast,
95	.set_contrast = ams_delta_lcd_set_contrast,
96};
97#endif
98
99
100/* omapfb panel section */
101
102static const struct gpio _gpios[] = {
103	{
104		.gpio	= AMS_DELTA_GPIO_PIN_LCD_VBLEN,
105		.flags	= GPIOF_OUT_INIT_LOW,
106		.label	= "lcd_vblen",
107	},
108	{
109		.gpio	= AMS_DELTA_GPIO_PIN_LCD_NDISP,
110		.flags	= GPIOF_OUT_INIT_LOW,
111		.label	= "lcd_ndisp",
112	},
113};
114
115static int ams_delta_panel_init(struct lcd_panel *panel,
116		struct omapfb_device *fbdev)
117{
118	return gpio_request_array(_gpios, ARRAY_SIZE(_gpios));
119}
120
121static void ams_delta_panel_cleanup(struct lcd_panel *panel)
122{
123	gpio_free_array(_gpios, ARRAY_SIZE(_gpios));
124}
125
126static int ams_delta_panel_enable(struct lcd_panel *panel)
127{
128	gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 1);
129	gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 1);
130	return 0;
131}
132
133static void ams_delta_panel_disable(struct lcd_panel *panel)
134{
135	gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_VBLEN, 0);
136	gpio_set_value(AMS_DELTA_GPIO_PIN_LCD_NDISP, 0);
137}
138
139static unsigned long ams_delta_panel_get_caps(struct lcd_panel *panel)
140{
141	return 0;
142}
143
144static struct lcd_panel ams_delta_panel = {
145	.name		= "ams-delta",
146	.config		= 0,
147
148	.bpp		= 12,
149	.data_lines	= 16,
150	.x_res		= 480,
151	.y_res		= 320,
152	.pixel_clock	= 4687,
153	.hsw		= 3,
154	.hfp		= 1,
155	.hbp		= 1,
156	.vsw		= 1,
157	.vfp		= 0,
158	.vbp		= 0,
159	.pcd		= 0,
160	.acb		= 37,
161
162	.init		= ams_delta_panel_init,
163	.cleanup	= ams_delta_panel_cleanup,
164	.enable		= ams_delta_panel_enable,
165	.disable	= ams_delta_panel_disable,
166	.get_caps	= ams_delta_panel_get_caps,
167};
168
169
170/* platform driver section */
171
172static int ams_delta_panel_probe(struct platform_device *pdev)
173{
174	struct lcd_device *lcd_device = NULL;
175#ifdef CONFIG_LCD_CLASS_DEVICE
176	int ret;
177
178	lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
179						&ams_delta_lcd_ops);
180
181	if (IS_ERR(lcd_device)) {
182		ret = PTR_ERR(lcd_device);
183		dev_err(&pdev->dev, "failed to register device\n");
184		return ret;
185	}
186
187	platform_set_drvdata(pdev, lcd_device);
188	lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
189#endif
190
191	ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
192	ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
193
194	omapfb_register_panel(&ams_delta_panel);
195	return 0;
196}
197
198static int ams_delta_panel_remove(struct platform_device *pdev)
199{
200	return 0;
201}
202
203static int ams_delta_panel_suspend(struct platform_device *pdev,
204		pm_message_t mesg)
205{
206	return 0;
207}
208
209static int ams_delta_panel_resume(struct platform_device *pdev)
210{
211	return 0;
212}
213
214static struct platform_driver ams_delta_panel_driver = {
215	.probe		= ams_delta_panel_probe,
216	.remove		= ams_delta_panel_remove,
217	.suspend	= ams_delta_panel_suspend,
218	.resume		= ams_delta_panel_resume,
219	.driver		= {
220		.name	= "lcd_ams_delta",
221	},
222};
223
224module_platform_driver(ams_delta_panel_driver);
225