aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ide/ide-generic.c
blob: a6073e248f450df8e09408652024b58dcc348d95 (plain) (blame)
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
/*
 * generic/default IDE host driver
 *
 * Copyright (C) 2004, 2008 Bartlomiej Zolnierkiewicz
 * This code was split off from ide.c.  See it for original copyrights.
 *
 * May be copied or modified under the terms of the GNU General Public License.
 */

/*
 * For special cases new interfaces may be added using sysfs, i.e.
 *
 *	echo -n "0x168:0x36e:10" > /sys/class/ide_generic/add
 *
 * will add an interface using I/O ports 0x168-0x16f/0x36e and IRQ 10.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/ide.h>

#define DRV_NAME	"ide_generic"

static ssize_t store_add(struct class *cls, const char *buf, size_t n)
{
	ide_hwif_t *hwif;
	unsigned int base, ctl;
	int irq;
	hw_regs_t hw;
	u8 idx[] = { 0xff, 0xff, 0xff, 0xff };

	if (sscanf(buf, "%x:%x:%d", &base, &ctl, &irq) != 3)
		return -EINVAL;

	hwif = ide_find_port();
	if (hwif == NULL)
		return -ENOENT;

	memset(&hw, 0, sizeof(hw));
	ide_std_init_ports(&hw, base, ctl);
	hw.irq = irq;
	hw.chipset = ide_generic;

	ide_init_port_hw(hwif, &hw);

	idx[0] = hwif->index;

	ide_device_add(idx, NULL);

	return n;
};

static struct class_attribute ide_generic_class_attrs[] = {
	__ATTR(add, S_IWUSR, NULL, store_add),
	__ATTR_NULL
};

static void ide_generic_class_release(struct class *cls)
{
	kfree(cls);
}

static int __init ide_generic_sysfs_init(void)
{
	struct class *cls;
	int rc;

	cls = kzalloc(sizeof(*cls), GFP_KERNEL);
	if (!cls)
		return -ENOMEM;

	cls->name = DRV_NAME;
	cls->owner = THIS_MODULE;
	cls->class_release = ide_generic_class_release;
	cls->class_attrs = ide_generic_class_attrs;

	rc = class_register(cls);
	if (rc) {
		kfree(cls);
		return rc;
	}

	return 0;
}

static int __init ide_generic_init(void)
{
	u8 idx[MAX_HWIFS];
	int i;

	for (i = 0; i < MAX_HWIFS; i++) {
		ide_hwif_t *hwif;
		unsigned long io_addr = ide_default_io_base(i);
		hw_regs_t hw;

		idx[i] = 0xff;

		if (io_addr) {
			if (!request_region(io_addr, 8, DRV_NAME)) {
				printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX "
						"not free.\n",
						DRV_NAME, io_addr, io_addr + 7);
				continue;
			}

			if (!request_region(io_addr + 0x206, 1, DRV_NAME)) {
				printk(KERN_ERR "%s: I/O resource 0x%lX "
						"not free.\n",
						DRV_NAME, io_addr + 0x206);
				release_region(io_addr, 8);
				continue;
			}

			/*
			 * Skip probing if the corresponding
			 * slot is already occupied.
			 */
			hwif = ide_find_port();
			if (hwif == NULL || hwif->index != i) {
				idx[i] = 0xff;
				continue;
			}

			memset(&hw, 0, sizeof(hw));
			ide_std_init_ports(&hw, io_addr, io_addr + 0x206);
			hw.irq = ide_default_irq(io_addr);
			ide_init_port_hw(hwif, &hw);

			idx[i] = i;
		}
	}

	ide_device_add_all(idx, NULL);

	if (ide_generic_sysfs_init())
		printk(KERN_ERR DRV_NAME ": failed to create ide_generic "
					 "class\n");

	return 0;
}

module_init(ide_generic_init);

MODULE_LICENSE("GPL");