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
|
/*
* Sky Nexus Register Driver
*
* Copyright (C) 2002 Brian Waite
*
* This driver allows reading the Nexus register
* It exports the /proc/sky_chassis_id and also
* /proc/sky_slot_id pseudo-file for status information.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/proc_fs.h>
#include <linux/hdpu_features.h>
#include <linux/platform_device.h>
#include <asm/io.h>
static int hdpu_nexus_probe(struct platform_device *pdev);
static int hdpu_nexus_remove(struct platform_device *pdev);
static struct proc_dir_entry *hdpu_slot_id;
static struct proc_dir_entry *hdpu_chassis_id;
static int slot_id = -1;
static int chassis_id = -1;
static struct platform_driver hdpu_nexus_driver = {
.probe = hdpu_nexus_probe,
.remove = hdpu_nexus_remove,
.driver = {
.name = HDPU_NEXUS_NAME,
},
};
int hdpu_slot_id_read(char *buffer, char **buffer_location, off_t offset,
int buffer_length, int *zero, void *ptr)
{
if (offset > 0)
return 0;
return sprintf(buffer, "%d\n", slot_id);
}
int hdpu_chassis_id_read(char *buffer, char **buffer_location, off_t offset,
int buffer_length, int *zero, void *ptr)
{
if (offset > 0)
return 0;
return sprintf(buffer, "%d\n", chassis_id);
}
static int hdpu_nexus_probe(struct platform_device *pdev)
{
struct resource *res;
int *nexus_id_addr;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
printk(KERN_ERR "sky_nexus: "
"Invalid memory resource.\n");
return -EINVAL;
}
nexus_id_addr = ioremap(res->start,
(unsigned long)(res->end - res->start));
if (nexus_id_addr) {
slot_id = (*nexus_id_addr >> 8) & 0x1f;
chassis_id = *nexus_id_addr & 0xff;
iounmap(nexus_id_addr);
} else {
printk(KERN_ERR "sky_nexus: Could not map slot id\n");
}
hdpu_slot_id = create_proc_entry("sky_slot_id", 0666, &proc_root);
hdpu_slot_id->read_proc = hdpu_slot_id_read;
hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root);
hdpu_chassis_id->read_proc = hdpu_chassis_id_read;
return 0;
}
static int hdpu_nexus_remove(struct platform_device *pdev)
{
slot_id = -1;
chassis_id = -1;
remove_proc_entry("sky_slot_id", &proc_root);
remove_proc_entry("sky_chassis_id", &proc_root);
hdpu_slot_id = 0;
hdpu_chassis_id = 0;
return 0;
}
static int __init nexus_init(void)
{
return platform_driver_register(&hdpu_nexus_driver);
}
static void __exit nexus_exit(void)
{
platform_driver_unregister(&hdpu_nexus_driver);
}
module_init(nexus_init);
module_exit(nexus_exit);
MODULE_AUTHOR("Brian Waite");
MODULE_LICENSE("GPL");
|
