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 <mach/hardware.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
29 static int ams_delta_lcd;
30 static struct gpio_desc *gpiod_vblen;
31 static struct gpio_desc *gpiod_ndisp;
32
ams_delta_lcd_set_power(struct lcd_device * dev,int power)33 static int ams_delta_lcd_set_power(struct lcd_device *dev, int power)
34 {
35 if (power == FB_BLANK_UNBLANK) {
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
ams_delta_lcd_set_contrast(struct lcd_device * dev,int value)52 static 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
ams_delta_lcd_get_power(struct lcd_device * dev)63 static int ams_delta_lcd_get_power(struct lcd_device *dev)
64 {
65 if (ams_delta_lcd & AMS_DELTA_LCD_POWER)
66 return FB_BLANK_UNBLANK;
67 else
68 return FB_BLANK_POWERDOWN;
69 }
70
ams_delta_lcd_get_contrast(struct lcd_device * dev)71 static 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
79 static 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
ams_delta_panel_enable(struct lcd_panel * panel)90 static 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
ams_delta_panel_disable(struct lcd_panel * panel)97 static 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
103 static 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
ams_delta_panel_probe(struct platform_device * pdev)128 static int ams_delta_panel_probe(struct platform_device *pdev)
129 {
130 struct lcd_device *lcd_device = NULL;
131 int ret;
132
133 gpiod_vblen = devm_gpiod_get(&pdev->dev, "vblen", GPIOD_OUT_LOW);
134 if (IS_ERR(gpiod_vblen)) {
135 ret = PTR_ERR(gpiod_vblen);
136 dev_err(&pdev->dev, "VBLEN GPIO request failed (%d)\n", ret);
137 return ret;
138 }
139
140 gpiod_ndisp = devm_gpiod_get(&pdev->dev, "ndisp", GPIOD_OUT_LOW);
141 if (IS_ERR(gpiod_ndisp)) {
142 ret = PTR_ERR(gpiod_ndisp);
143 dev_err(&pdev->dev, "NDISP GPIO request failed (%d)\n", ret);
144 return ret;
145 }
146
147 #ifdef CONFIG_LCD_CLASS_DEVICE
148 lcd_device = lcd_device_register("omapfb", &pdev->dev, NULL,
149 &ams_delta_lcd_ops);
150
151 if (IS_ERR(lcd_device)) {
152 ret = PTR_ERR(lcd_device);
153 dev_err(&pdev->dev, "failed to register device\n");
154 return ret;
155 }
156
157 platform_set_drvdata(pdev, lcd_device);
158 lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
159 #endif
160
161 ams_delta_lcd_set_contrast(lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
162 ams_delta_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
163
164 omapfb_register_panel(&ams_delta_panel);
165 return 0;
166 }
167
168 static struct platform_driver ams_delta_panel_driver = {
169 .probe = ams_delta_panel_probe,
170 .driver = {
171 .name = "lcd_ams_delta",
172 },
173 };
174
175 module_platform_driver(ams_delta_panel_driver);
176
177 MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
178 MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone");
179 MODULE_LICENSE("GPL");
180
