6b13f685e
 김민수
BSP 최초 추가
|
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
|
/* linux/drivers/char/nsc_gpio.c
National Semiconductor common GPIO device-file/VFS methods.
Allows a user space process to control the GPIO pins.
Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
Copyright (c) 2005 Jim Cromie <jim.cromie@gmail.com>
*/
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/nsc_gpio.h>
#include <linux/platform_device.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#define NAME "nsc_gpio"
void nsc_gpio_dump(struct nsc_gpio_ops *amp, unsigned index)
{
/* retrieve current config w/o changing it */
u32 config = amp->gpio_config(index, ~0, 0);
/* user requested via 'v' command, so its INFO */
dev_info(amp->dev, "io%02u: 0x%04x %s %s %s %s %s %s %s\tio:%d/%d
",
index, config,
(config & 1) ? "OE" : "TS", /* output-enabled/tristate */
(config & 2) ? "PP" : "OD", /* push pull / open drain */
(config & 4) ? "PUE" : "PUD", /* pull up enabled/disabled */
(config & 8) ? "LOCKED" : "", /* locked / unlocked */
(config & 16) ? "LEVEL" : "EDGE",/* level/edge input */
(config & 32) ? "HI" : "LO", /* trigger on rise/fall edge */
(config & 64) ? "DEBOUNCE" : "", /* debounce */
amp->gpio_get(index), amp->gpio_current(index));
}
ssize_t nsc_gpio_write(struct file *file, const char __user *data,
size_t len, loff_t *ppos)
{
unsigned m = iminor(file_inode(file));
struct nsc_gpio_ops *amp = file->private_data;
struct device *dev = amp->dev;
size_t i;
int err = 0;
for (i = 0; i < len; ++i) {
char c;
if (get_user(c, data + i))
return -EFAULT;
switch (c) {
case '0':
amp->gpio_set(m, 0);
break;
case '1':
amp->gpio_set(m, 1);
break;
case 'O':
dev_dbg(dev, "GPIO%d output enabled
", m);
amp->gpio_config(m, ~1, 1);
break;
case 'o':
dev_dbg(dev, "GPIO%d output disabled
", m);
amp->gpio_config(m, ~1, 0);
break;
case 'T':
dev_dbg(dev, "GPIO%d output is push pull
", m);
amp->gpio_config(m, ~2, 2);
break;
case 't':
dev_dbg(dev, "GPIO%d output is open drain
", m);
amp->gpio_config(m, ~2, 0);
break;
case 'P':
dev_dbg(dev, "GPIO%d pull up enabled
", m);
amp->gpio_config(m, ~4, 4);
break;
case 'p':
dev_dbg(dev, "GPIO%d pull up disabled
", m);
amp->gpio_config(m, ~4, 0);
break;
case 'v':
/* View Current pin settings */
amp->gpio_dump(amp, m);
break;
case '
':
/* end of settings string, do nothing */
break;
default:
dev_err(dev, "io%2d bad setting: chr<0x%2x>
",
m, (int)c);
err++;
}
}
if (err)
return -EINVAL; /* full string handled, report error */
return len;
}
ssize_t nsc_gpio_read(struct file *file, char __user * buf,
size_t len, loff_t * ppos)
{
unsigned m = iminor(file_inode(file));
int value;
struct nsc_gpio_ops *amp = file->private_data;
value = amp->gpio_get(m);
if (put_user(value ? '1' : '0', buf))
return -EFAULT;
return 1;
}
/* common file-ops routines for both scx200_gpio and pc87360_gpio */
EXPORT_SYMBOL(nsc_gpio_write);
EXPORT_SYMBOL(nsc_gpio_read);
EXPORT_SYMBOL(nsc_gpio_dump);
static int __init nsc_gpio_init(void)
{
printk(KERN_DEBUG NAME " initializing
");
return 0;
}
static void __exit nsc_gpio_cleanup(void)
{
printk(KERN_DEBUG NAME " cleanup
");
}
module_init(nsc_gpio_init);
module_exit(nsc_gpio_cleanup);
MODULE_AUTHOR("Jim Cromie <jim.cromie@gmail.com>");
MODULE_DESCRIPTION("NatSemi GPIO Common Methods");
MODULE_LICENSE("GPL");
|