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 
43 static int ams_delta_lcd;
44 
45 static 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 
64 static 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
75 static 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 
83 static 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 
91 static 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 
102 static 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 
115 static 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 
121 static void ams_delta_panel_cleanup(struct lcd_panel *panel)
122 {
123 	gpio_free_array(_gpios, ARRAY_SIZE(_gpios));
124 }
125 
126 static 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 
133 static 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 
139 static struct lcd_panel ams_delta_panel = {
140 	.name		= "ams-delta",
141 	.config		= 0,
142 
143 	.bpp		= 12,
144 	.data_lines	= 16,
145 	.x_res		= 480,
146 	.y_res		= 320,
147 	.pixel_clock	= 4687,
148 	.hsw		= 3,
149 	.hfp		= 1,
150 	.hbp		= 1,
151 	.vsw		= 1,
152 	.vfp		= 0,
153 	.vbp		= 0,
154 	.pcd		= 0,
155 	.acb		= 37,
156 
157 	.init		= ams_delta_panel_init,
158 	.cleanup	= ams_delta_panel_cleanup,
159 	.enable		= ams_delta_panel_enable,
160 	.disable	= ams_delta_panel_disable,
161 };
162 
163 
164 /* platform driver section */
165 
166 static int ams_delta_panel_probe(struct platform_device *pdev)
167 {
168 	struct lcd_device *lcd_device = NULL;
169 #ifdef CONFIG_LCD_CLASS_DEVICE
170 	int ret;
171 
172 	lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
173 						&ams_delta_lcd_ops);
174 
175 	if (IS_ERR(lcd_device)) {
176 		ret = PTR_ERR(lcd_device);
177 		dev_err(&pdev->dev, "failed to register device\n");
178 		return ret;
179 	}
180 
181 	platform_set_drvdata(pdev, lcd_device);
182 	lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
183 #endif
184 
185 	ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
186 	ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
187 
188 	omapfb_register_panel(&ams_delta_panel);
189 	return 0;
190 }
191 
192 static struct platform_driver ams_delta_panel_driver = {
193 	.probe		= ams_delta_panel_probe,
194 	.driver		= {
195 		.name	= "lcd_ams_delta",
196 	},
197 };
198 
199 module_platform_driver(ams_delta_panel_driver);
200 
201 MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
202 MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone");
203 MODULE_LICENSE("GPL");
204