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| author | Alan Stern <stern@rowland.harvard.edu> | 2007-05-04 19:52:20 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-13 03:29:47 +0400 |
| commit | 0458d5b4c9cc4ca0f62625d0144ddc4b4bc97a3c (patch) | |
| tree | 8b1fcb4f063ef4aa6f2e3cd41a60d986a1e432d4 /include/linux/usb.h | |
| parent | ce7cd137fced114d49178b73d468b82096a107fb (diff) | |
| download | linux-0458d5b4c9cc4ca0f62625d0144ddc4b4bc97a3c.tar.xz | |
USB: add USB-Persist facility
This patch (as886) adds the controversial USB-persist facility,
allowing USB devices to persist across a power loss during system
suspend.
The facility is controlled by a new Kconfig option (with appropriate
warnings about the potential dangers); when the option is off the
behavior will remain the same as it is now. But when the option is
on, people will be able to use suspend-to-disk and keep their USB
filesystems intact -- something particularly valuable for small
machines where the root filesystem is on a USB device!
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/usb.h')
| -rw-r--r-- | include/linux/usb.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index 56aa2ee21f1b..3d63e0c2dd70 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -403,6 +403,7 @@ struct usb_device { unsigned auto_pm:1; /* autosuspend/resume in progress */ unsigned do_remote_wakeup:1; /* remote wakeup should be enabled */ + unsigned reset_resume:1; /* needs reset instead of resume */ unsigned autosuspend_disabled:1; /* autosuspend and autoresume */ unsigned autoresume_disabled:1; /* disabled by the user */ #endif @@ -819,7 +820,10 @@ struct usbdrv_wrap { * @pre_reset: Called by usb_reset_composite_device() when the device * is about to be reset. * @post_reset: Called by usb_reset_composite_device() after the device - * has been reset. + * has been reset, or in lieu of @resume following a reset-resume + * (i.e., the device is reset instead of being resumed, as might + * happen if power was lost). The second argument tells which is + * the reason. * @id_table: USB drivers use ID table to support hotplugging. * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set * or your driver's probe function will never get called. @@ -861,7 +865,7 @@ struct usb_driver { int (*resume) (struct usb_interface *intf); void (*pre_reset) (struct usb_interface *intf); - void (*post_reset) (struct usb_interface *intf); + void (*post_reset) (struct usb_interface *intf, int reset_resume); const struct usb_device_id *id_table; |