diff options
Diffstat (limited to 'include/linux/usb/composite.h')
| -rw-r--r-- | include/linux/usb/composite.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h index 3d29a7dcac2..b78cba466d3 100644 --- a/include/linux/usb/composite.h +++ b/include/linux/usb/composite.h @@ -37,6 +37,14 @@ #include <linux/usb/ch9.h> #include <linux/usb/gadget.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_configuration; @@ -188,7 +196,7 @@ ep_choose(struct usb_gadget *g, struct usb_endpoint_descriptor *hs, * @bind() method is then used to initialize all the functions and then * call @usb_add_function() for them. * - * Those functions would normally be independant of each other, but that's + * Those functions would normally be independent of each other, but that's * not mandatory. CDC WMC devices are an example where functions often * depend on other functions, with some functions subsidiary to others. * Such interdependency may be managed in any way, so long as all of the @@ -285,6 +293,7 @@ struct usb_composite_driver { extern int usb_composite_probe(struct usb_composite_driver *driver, int (*bind)(struct usb_composite_dev *cdev)); extern void usb_composite_unregister(struct usb_composite_driver *driver); +extern void usb_composite_setup_continue(struct usb_composite_dev *cdev); /** @@ -342,7 +351,12 @@ 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; }; |