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 <linux/soc/ti/omap1-io.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
29static int ams_delta_lcd;
30static struct gpio_desc *gpiod_vblen;
31static struct gpio_desc *gpiod_ndisp;
32
33static 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(v: ams_delta_lcd & AMS_DELTA_MAX_CONTRAST,
38 OMAP_PWL_ENABLE);
39 omap_writeb(v: 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(v: 0, OMAP_PWL_ENABLE);
45 omap_writeb(v: 0, OMAP_PWL_CLK_ENABLE);
46 ams_delta_lcd &= ~AMS_DELTA_LCD_POWER;
47 }
48 }
49 return 0;
50}
51
52static 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(v: 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
63static 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
71static 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
79static 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
90static int ams_delta_panel_enable(struct lcd_panel *panel)
91{
92 gpiod_set_value(desc: gpiod_ndisp, value: 1);
93 gpiod_set_value(desc: gpiod_vblen, value: 1);
94 return 0;
95}
96
97static void ams_delta_panel_disable(struct lcd_panel *panel)
98{
99 gpiod_set_value(desc: gpiod_vblen, value: 0);
100 gpiod_set_value(desc: gpiod_ndisp, value: 0);
101}
102
103static 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
128static int ams_delta_panel_probe(struct platform_device *pdev)
129{
130 struct lcd_device *lcd_device = NULL;
131
132 gpiod_vblen = devm_gpiod_get(dev: &pdev->dev, con_id: "vblen", flags: GPIOD_OUT_LOW);
133 if (IS_ERR(ptr: gpiod_vblen))
134 return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: gpiod_vblen),
135 fmt: "VBLEN GPIO request failed\n");
136
137 gpiod_ndisp = devm_gpiod_get(dev: &pdev->dev, con_id: "ndisp", flags: GPIOD_OUT_LOW);
138 if (IS_ERR(ptr: gpiod_ndisp))
139 return dev_err_probe(dev: &pdev->dev, err: PTR_ERR(ptr: gpiod_ndisp),
140 fmt: "NDISP GPIO request failed\n");
141
142#ifdef CONFIG_LCD_CLASS_DEVICE
143 lcd_device = lcd_device_register(name: "omapfb", parent: &pdev->dev, NULL,
144 ops: &ams_delta_lcd_ops);
145
146 if (IS_ERR(ptr: lcd_device)) {
147 int ret = PTR_ERR(ptr: lcd_device);
148
149 dev_err(&pdev->dev, "failed to register device\n");
150 return ret;
151 }
152
153 platform_set_drvdata(pdev, data: lcd_device);
154 lcd_device->props.max_contrast = AMS_DELTA_MAX_CONTRAST;
155#endif
156
157 ams_delta_lcd_set_contrast(dev: lcd_device, AMS_DELTA_DEFAULT_CONTRAST);
158 ams_delta_lcd_set_power(dev: lcd_device, power: FB_BLANK_UNBLANK);
159
160 omapfb_register_panel(panel: &ams_delta_panel);
161 return 0;
162}
163
164static struct platform_driver ams_delta_panel_driver = {
165 .probe = ams_delta_panel_probe,
166 .driver = {
167 .name = "lcd_ams_delta",
168 },
169};
170
171module_platform_driver(ams_delta_panel_driver);
172
173MODULE_AUTHOR("Jonathan McDowell <noodles@earth.li>");
174MODULE_DESCRIPTION("LCD panel support for the Amstrad E3 (Delta) videophone");
175MODULE_LICENSE("GPL");
176

source code of linux/drivers/video/fbdev/omap/lcd_ams_delta.c