ide-generic: add ide_generic class and attribute for adding new interfaces

* Add ide_generic_sysfs_init() helper registering 'ide_generic' class
  (together with ide_generic_class_release() ->class_release method)
  and use it in ide_generic_init().

* Add "add" class attribute to 'ide_generic' class for adding new interfaces
  (it is intended to be a replacement for obsoleted "idex=base[,ctl[,irq]]"
  kernel parameters).
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <>
parent f74c9141
* generic/default IDE host driver
* Copyright (C) 2004 Bartlomiej Zolnierkiewicz
* 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(base);
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),
static void ide_generic_class_release(struct class *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) {
return rc;
return 0;
static int __init ide_generic_init(void)
u8 idx[MAX_HWIFS];
......@@ -30,6 +102,10 @@ static int __init ide_generic_init(void)
ide_device_add_all(idx, NULL);
if (ide_generic_sysfs_init())
printk(KERN_ERR DRV_NAME ": failed to create ide_generic "
return 0;
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