1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* arch/sh/boards/landisk/gio.c - driver for landisk
*
* This driver will also support the I-O DATA Device, Inc. LANDISK Board.
* LANDISK and USL-5P Button, LED and GIO driver drive function.
*
* Copylight (C) 2006 kogiidena
* Copylight (C) 2002 Atom Create Engineering Co., Ltd. *
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kdev_t.h>
#include <linux/cdev.h>
#include <linux/fs.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/landisk/gio.h>
#include <asm/landisk/iodata_landisk.h>
#define DEVCOUNT 4
#define GIO_MINOR 2 /* GIO minor no. */
static dev_t dev;
static struct cdev *cdev_p;
static int openCnt;
static int gio_open(struct inode *inode, struct file *filp)
{
int minor;
minor = MINOR(inode->i_rdev);
if (minor < DEVCOUNT) {
if (openCnt > 0) {
return -EALREADY;
} else {
openCnt++;
return 0;
}
}
return -ENOENT;
}
static int gio_close(struct inode *inode, struct file *filp)
{
int minor;
minor = MINOR(inode->i_rdev);
if (minor < DEVCOUNT) {
openCnt--;
}
return 0;
}
static int gio_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
{
unsigned int data;
static unsigned int addr = 0;
if (cmd & 0x01) { /* write */
if (copy_from_user(&data, (int *)arg, sizeof(int))) {
return -EFAULT;
}
}
switch (cmd) {
case GIODRV_IOCSGIOSETADDR: /* address set */
addr = data;
break;
case GIODRV_IOCSGIODATA1: /* write byte */
ctrl_outb((unsigned char)(0x0ff & data), addr);
break;
case GIODRV_IOCSGIODATA2: /* write word */
if (addr & 0x01) {
return -EFAULT;
}
ctrl_outw((unsigned short int)(0x0ffff & data), addr);
break;
case GIODRV_IOCSGIODATA4: /* write long */
if (addr & 0x03) {
return -EFAULT;
}
ctrl_outl(data, addr);
break;
case GIODRV_IOCGGIODATA1: /* read byte */
data = ctrl_inb(addr);
break;
case GIODRV_IOCGGIODATA2: /* read word */
if (addr & 0x01) {
return -EFAULT;
}
data = ctrl_inw(addr);
break;
case GIODRV_IOCGGIODATA4: /* read long */
if (addr & 0x03) {
return -EFAULT;
}
data = ctrl_inl(addr);
break;
default:
return -EFAULT;
break;
}
if ((cmd & 0x01) == 0) { /* read */
if (copy_to_user((int *)arg, &data, sizeof(int))) {
return -EFAULT;
}
}
return 0;
}
static struct file_operations gio_fops = {
.owner = THIS_MODULE,
.open = gio_open, /* open */
.release = gio_close, /* release */
.ioctl = gio_ioctl, /* ioctl */
};
static int __init gio_init(void)
{
int error;
printk(KERN_INFO "gio: driver initialized\n");
openCnt = 0;
if ((error = alloc_chrdev_region(&dev, 0, DEVCOUNT, "gio")) < 0) {
printk(KERN_ERR
"gio: Couldn't alloc_chrdev_region, error=%d\n",
error);
return 1;
}
cdev_p = cdev_alloc();
cdev_p->ops = &gio_fops;
error = cdev_add(cdev_p, dev, DEVCOUNT);
if (error) {
printk(KERN_ERR
"gio: Couldn't cdev_add, error=%d\n", error);
return 1;
}
return 0;
}
static void __exit gio_exit(void)
{
cdev_del(cdev_p);
unregister_chrdev_region(dev, DEVCOUNT);
}
module_init(gio_init);
module_exit(gio_exit);
MODULE_LICENSE("GPL");
|
