diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/usb/composite.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h index cb28d4302781..26b30db9770c 100644 --- a/include/linux/usb/composite.h +++ b/include/linux/usb/composite.h @@ -38,6 +38,14 @@ #include <linux/usb/gadget.h> #include <linux/switch.h> +/* + * USB function drivers should return USB_GADGET_DELAYED_STATUS if they + * wish to delay the data/status stages of the control transfer till they + * are ready. The control transfer will then be kept from completing till + * all the function drivers that requested for USB_GADGET_DELAYED_STAUS + * invoke usb_composite_setup_continue(). + */ +#define USB_GADGET_DELAYED_STATUS 0x7fff /* Impossibly large value */ struct usb_composite_dev; struct usb_configuration; @@ -300,7 +308,7 @@ struct usb_composite_driver { extern int usb_composite_register(struct usb_composite_driver *); extern void usb_composite_unregister(struct usb_composite_driver *); - +extern void usb_composite_setup_continue(struct usb_composite_dev *cdev); /** * struct usb_composite_device - represents one composite usb gadget @@ -354,7 +362,12 @@ struct usb_composite_dev { */ unsigned deactivations; - /* protects at least deactivation count */ + /* the composite driver won't complete the control transfer's + * data/status stages till delayed_status is zero. + */ + int delayed_status; + + /* protects deactivations and delayed_status counts*/ spinlock_t lock; /* switch indicating connected/disconnected state */ |