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ide: add warm-plug support for IDE devices (take 2)

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* Add 'struct class ide_port_class' ('ide_port' class) and a 'struct
  device *portdev' ('ide_port' class device) in ide_hwif_t.

* Register 'ide_port' class in ide_init() and unregister it in
  cleanup_module().

* Create ->portdev in ide_register_port () and unregister it in
  ide_unregister().

* Add "delete_devices" class device attribute for unregistering IDE devices
  on a port and "scan" one for probing+registering IDE devices on a port.

* Add ide_sysfs_register_port() helper for registering "delete_devices"
  and "scan" attributes with ->portdev.  Call it in ide_device_add_all().

* Document IDE warm-plug support in Documentation/ide/warm-plug-howto.txt.

v2:
* Convert patch from using 'struct class_device' to use 'struct device'.
  (thanks to Kay Sievers for doing it)

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2008-04-18 00:46:23 +02:00
parent 50672e5d74
commit f74c91413e
4 changed files with 110 additions and 3 deletions
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24
drivers/ide/ide.c
View File

@ -78,6 +78,8 @@
/* default maximum number of failures */
#define IDE_DEFAULT_MAX_FAILURES 1
struct class *ide_port_class;
static const u8 ide_hwif_to_major[] = { IDE0_MAJOR, IDE1_MAJOR,
IDE2_MAJOR, IDE3_MAJOR,
IDE4_MAJOR, IDE5_MAJOR,
@ -591,6 +593,7 @@ void ide_unregister(unsigned int index, int init_default, int restore)
ide_remove_port_from_hwgroup(hwif);
device_unregister(hwif->portdev);
device_unregister(&hwif->gendev);
wait_for_completion(&hwif->gendev_rel_comp);
@ -1590,6 +1593,13 @@ struct bus_type ide_bus_type = {
EXPORT_SYMBOL_GPL(ide_bus_type);
static void ide_port_class_release(struct device *portdev)
{
ide_hwif_t *hwif = dev_get_drvdata(portdev);
put_device(&hwif->gendev);
}
/*
* This is gets invoked once during initialization, to set *everything* up
*/
@ -1610,11 +1620,23 @@ static int __init ide_init(void)
return ret;
}
ide_port_class = class_create(THIS_MODULE, "ide_port");
if (IS_ERR(ide_port_class)) {
ret = PTR_ERR(ide_port_class);
goto out_port_class;
}
ide_port_class->dev_release = ide_port_class_release;
init_ide_data();
proc_ide_create();
return 0;
out_port_class:
bus_unregister(&ide_bus_type);
return ret;
}
#ifdef MODULE
@ -1651,6 +1673,8 @@ void __exit cleanup_module (void)
proc_ide_destroy();
class_destroy(ide_port_class);
bus_unregister(&ide_bus_type);
}