summaryrefslogtreecommitdiffstats
path: root/drivers/misc/hdpuftrs/hdpu_nexus.c
blob: 2887b21479800669f0af10b66e7dd79ddbdb0d19 (plain)
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
/*
 *	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 <linux/seq_file.h>
#include <asm/io.h>

static int hdpu_nexus_probe(struct platform_device *pdev);
static int hdpu_nexus_remove(struct platform_device *pdev);
static int hdpu_slot_id_open(struct inode *inode, struct file *file);
static int hdpu_slot_id_read(struct seq_file *seq, void *offset);
static int hdpu_chassis_id_open(struct inode *inode, struct file *file);
static int hdpu_chassis_id_read(struct seq_file *seq, void *offset);

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 const struct file_operations proc_slot_id = {
	.open = hdpu_slot_id_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static const struct file_operations proc_chassis_id = {
	.open = hdpu_chassis_id_open,
	.read = seq_read,
	.llseek	= seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static struct platform_driver hdpu_nexus_driver = {
	.probe = hdpu_nexus_probe,
	.remove = hdpu_nexus_remove,
	.driver = {
		.name = HDPU_NEXUS_NAME,
	},
};

static int hdpu_slot_id_open(struct inode *inode, struct file *file)
{
	return single_open(file, hdpu_slot_id_read, NULL);
}

static int hdpu_slot_id_read(struct seq_file *seq, void *offset)
{
	seq_printf(seq, "%d\n", slot_id);
	return 0;
}

static int hdpu_chassis_id_open(struct inode *inode, struct file *file)
{
	return single_open(file, hdpu_chassis_id_read, NULL);
}

static int hdpu_chassis_id_read(struct seq_file *seq, void *offset)
{
	seq_printf(seq, "%d\n", chassis_id);
	return 0;
}

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);
	if (!hdpu_slot_id) {
		printk(KERN_WARNING "sky_nexus: "
		       "Unable to create proc dir entry: sky_slot_id\n");
	} else {
		hdpu_slot_id->proc_fops = &proc_slot_id;
		hdpu_slot_id->owner = THIS_MODULE;
	}

	hdpu_chassis_id = create_proc_entry("sky_chassis_id", 0666, &proc_root);
	if (!hdpu_chassis_id) {
		printk(KERN_WARNING "sky_nexus: "
		       "Unable to create proc dir entry: sky_chassis_id\n");
	} else {
		hdpu_chassis_id->proc_fops = &proc_chassis_id;
		hdpu_chassis_id->owner = THIS_MODULE;
	}

	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");
OpenPOWER on IntegriCloud