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authorAlan Stern <stern@rowland.harvard.edu>2007-05-04 19:52:20 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2007-07-13 03:29:47 +0400
commit0458d5b4c9cc4ca0f62625d0144ddc4b4bc97a3c (patch)
tree8b1fcb4f063ef4aa6f2e3cd41a60d986a1e432d4 /include/linux/usb.h
parentce7cd137fced114d49178b73d468b82096a107fb (diff)
downloadlinux-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.h8
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;