tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 *
3 * LCD driver for HP Jornada 700 series (710/720/728)
4 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 or any later version as published by the Free Software Foundation.
9 *
10 */
11
12#include <linux/device.h>
13#include <linux/fb.h>
14#include <linux/kernel.h>
15#include <linux/lcd.h>
16#include <linux/module.h>
17#include <linux/platform_device.h>
18#include <linux/delay.h>
19
20#include <mach/jornada720.h>
21#include <mach/hardware.h>
22
23#include <video/s1d13xxxfb.h>
24
25#define LCD_MAX_CONTRAST 0xff
26#define LCD_DEF_CONTRAST 0x80
27
28static int jornada_lcd_get_power(struct lcd_device *dev)
29{
30 /* LDD2 in PPC = LCD POWER */
31 if (PPSR & PPC_LDD2)
32 return FB_BLANK_UNBLANK; /* PW ON */
33 else
34 return FB_BLANK_POWERDOWN; /* PW OFF */
35}
36
37static int jornada_lcd_get_contrast(struct lcd_device *dev)
38{
39 int ret;
40
41 if (jornada_lcd_get_power(dev) != FB_BLANK_UNBLANK)
42 return 0;
43
44 jornada_ssp_start();
45
46 if (jornada_ssp_byte(GETCONTRAST) != TXDUMMY) {
47 printk(KERN_ERR "lcd: get contrast failed\n");
48 jornada_ssp_end();
49 return -ETIMEDOUT;
50 } else {
51 ret = jornada_ssp_byte(TXDUMMY);
52 jornada_ssp_end();
53 return ret;
54 }
55}
56
57static int jornada_lcd_set_contrast(struct lcd_device *dev, int value)
58{
59 int ret;
60
61 jornada_ssp_start();
62
63 /* start by sending our set contrast cmd to mcu */
64 ret = jornada_ssp_byte(SETCONTRAST);
65
66 /* push the new value */
67 if (jornada_ssp_byte(value) != TXDUMMY) {
68 printk(KERN_ERR "lcd : set contrast failed\n");
69 jornada_ssp_end();
70 return -ETIMEDOUT;
71 }
72
73 /* if we get here we can assume everything went well */
74 jornada_ssp_end();
75
76 return 0;
77}
78
79static int jornada_lcd_set_power(struct lcd_device *dev, int power)
80{
81 if (power != FB_BLANK_UNBLANK) {
82 PPSR &= ~PPC_LDD2;
83 PPDR |= PPC_LDD2;
84 } else
85 PPSR |= PPC_LDD2;
86
87 return 0;
88}
89
90static struct lcd_ops jornada_lcd_props = {
91 .get_contrast = jornada_lcd_get_contrast,
92 .set_contrast = jornada_lcd_set_contrast,
93 .get_power = jornada_lcd_get_power,
94 .set_power = jornada_lcd_set_power,
95};
96
97static int jornada_lcd_probe(struct platform_device *pdev)
98{
99 struct lcd_device *lcd_device;
100 int ret;
101
102 lcd_device = lcd_device_register(S1D_DEVICENAME, &pdev->dev, NULL, &jornada_lcd_props);
103
104 if (IS_ERR(lcd_device)) {
105 ret = PTR_ERR(lcd_device);
106 printk(KERN_ERR "lcd : failed to register device\n");
107 return ret;
108 }
109
110 platform_set_drvdata(pdev, lcd_device);
111
112 /* lets set our default values */
113 jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
114 jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
115 /* give it some time to startup */
116 msleep(100);
117
118 return 0;
119}
120
121static int jornada_lcd_remove(struct platform_device *pdev)
122{
123 struct lcd_device *lcd_device = platform_get_drvdata(pdev);
124
125 lcd_device_unregister(lcd_device);
126
127 return 0;
128}
129
130static struct platform_driver jornada_lcd_driver = {
131 .probe = jornada_lcd_probe,
132 .remove = jornada_lcd_remove,
133 .driver = {
134 .name = "jornada_lcd",
135 },
136};
137
138int __init jornada_lcd_init(void)
139{
140 return platform_driver_register(&jornada_lcd_driver);
141}
142
143void __exit jornada_lcd_exit(void)
144{
145 platform_driver_unregister(&jornada_lcd_driver);
146}
147
148MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
149MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
150MODULE_LICENSE("GPL");
151
152module_init(jornada_lcd_init);
153module_exit(jornada_lcd_exit);