1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 *
4 * LCD driver for HP Jornada 700 series (710/720/728)
5 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
6 */
7
8 #include <linux/device.h>
9 #include <linux/fb.h>
10 #include <linux/kernel.h>
11 #include <linux/lcd.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/delay.h>
15
16 #include <mach/jornada720.h>
17 #include <mach/hardware.h>
18
19 #include <video/s1d13xxxfb.h>
20
21 #define LCD_MAX_CONTRAST 0xff
22 #define LCD_DEF_CONTRAST 0x80
23
jornada_lcd_get_power(struct lcd_device * ld)24 static int jornada_lcd_get_power(struct lcd_device *ld)
25 {
26 return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
27 }
28
jornada_lcd_get_contrast(struct lcd_device * ld)29 static int jornada_lcd_get_contrast(struct lcd_device *ld)
30 {
31 int ret;
32
33 if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
34 return 0;
35
36 jornada_ssp_start();
37
38 if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
39 ret = jornada_ssp_byte(TXDUMMY);
40 goto success;
41 }
42
43 dev_err(&ld->dev, "failed to set contrast\n");
44 ret = -ETIMEDOUT;
45
46 success:
47 jornada_ssp_end();
48 return ret;
49 }
50
jornada_lcd_set_contrast(struct lcd_device * ld,int value)51 static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
52 {
53 int ret = 0;
54
55 jornada_ssp_start();
56
57 /* start by sending our set contrast cmd to mcu */
58 if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
59 /* if successful push the new value */
60 if (jornada_ssp_byte(value) == TXDUMMY)
61 goto success;
62 }
63
64 dev_err(&ld->dev, "failed to set contrast\n");
65 ret = -ETIMEDOUT;
66
67 success:
68 jornada_ssp_end();
69 return ret;
70 }
71
jornada_lcd_set_power(struct lcd_device * ld,int power)72 static int jornada_lcd_set_power(struct lcd_device *ld, int power)
73 {
74 if (power != FB_BLANK_UNBLANK) {
75 PPSR &= ~PPC_LDD2;
76 PPDR |= PPC_LDD2;
77 } else {
78 PPSR |= PPC_LDD2;
79 }
80
81 return 0;
82 }
83
84 static struct lcd_ops jornada_lcd_props = {
85 .get_contrast = jornada_lcd_get_contrast,
86 .set_contrast = jornada_lcd_set_contrast,
87 .get_power = jornada_lcd_get_power,
88 .set_power = jornada_lcd_set_power,
89 };
90
jornada_lcd_probe(struct platform_device * pdev)91 static int jornada_lcd_probe(struct platform_device *pdev)
92 {
93 struct lcd_device *lcd_device;
94 int ret;
95
96 lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
97 &pdev->dev, NULL, &jornada_lcd_props);
98
99 if (IS_ERR(lcd_device)) {
100 ret = PTR_ERR(lcd_device);
101 dev_err(&pdev->dev, "failed to register device\n");
102 return ret;
103 }
104
105 platform_set_drvdata(pdev, lcd_device);
106
107 /* lets set our default values */
108 jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
109 jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
110 /* give it some time to startup */
111 msleep(100);
112
113 return 0;
114 }
115
116 static struct platform_driver jornada_lcd_driver = {
117 .probe = jornada_lcd_probe,
118 .driver = {
119 .name = "jornada_lcd",
120 },
121 };
122
123 module_platform_driver(jornada_lcd_driver);
124
125 MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
126 MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
127 MODULE_LICENSE("GPL");
128