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
ams_delta_lcd_set_power(struct lcd_device * dev,int power)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
ams_delta_lcd_set_contrast(struct lcd_device * dev,int value)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
ams_delta_lcd_get_power(struct lcd_device * dev)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
ams_delta_lcd_get_contrast(struct lcd_device * dev)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
ams_delta_panel_init(struct lcd_panel * panel,struct omapfb_device * fbdev)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
ams_delta_panel_cleanup(struct lcd_panel * panel)121 static void ams_delta_panel_cleanup(struct lcd_panel *panel)
122 {
123 gpio_free_array(_gpios, ARRAY_SIZE(_gpios));
124 }
125
ams_delta_panel_enable(struct lcd_panel * panel)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
ams_delta_panel_disable(struct lcd_panel * panel)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
ams_delta_panel_probe(struct platform_device * pdev)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
