summaryrefslogtreecommitdiffstats
path: root/drivers/video/fbdev/omap/lcd_ams_delta.c
blob: cddbd00cbf9fffdbe92e8e3c12ef3ebf3b4fa0be (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
/*
 * 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>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#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 <mach/hardware.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;
	int ret;

	gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
	if (IS_ERR(gpiod_vblen)) {
		ret = PTR_ERR(gpiod_vblen);
		dev_err(&pdev->dev, "VBLEN GPIO request failed (%d)\n", ret);
		return ret;
	}

	gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW);
	if (IS_ERR(gpiod_ndisp)) {
		ret = PTR_ERR(gpiod_ndisp);
		dev_err(&pdev->dev, "NDISP GPIO request failed (%d)\n", ret);
		return ret;
	}

#ifdef CONFIG_LCD_CLASS_DEVICE
	lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
						&ams_delta_lcd_ops);

	if (IS_ERR(lcd_device)) {
		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");