diff options
| -rw-r--r-- | Documentation/driver-api/usb/anchors.rst (renamed from Documentation/usb/anchors.txt) | 36 | ||||
| -rw-r--r-- | Documentation/driver-api/usb/index.rst | 1 |
2 files changed, 21 insertions, 16 deletions
diff --git a/Documentation/usb/anchors.txt b/Documentation/driver-api/usb/anchors.rst index fe6a99a32bbd..4b248e691bd6 100644 --- a/Documentation/usb/anchors.txt +++ b/Documentation/driver-api/usb/anchors.rst @@ -1,3 +1,6 @@ +USB Anchors +~~~~~~~~~~~ + What is anchor? =============== @@ -13,7 +16,7 @@ Allocation and Initialisation ============================= There's no API to allocate an anchor. It is simply declared -as struct usb_anchor. init_usb_anchor() must be called to +as struct usb_anchor. :c:func:`init_usb_anchor` must be called to initialise the data structure. Deallocation @@ -26,52 +29,53 @@ Association and disassociation of URBs with anchors =================================================== An association of URBs to an anchor is made by an explicit -call to usb_anchor_urb(). The association is maintained until +call to :c:func:`usb_anchor_urb`. The association is maintained until an URB is finished by (successful) completion. Thus disassociation is automatic. A function is provided to forcibly finish (kill) all URBs associated with an anchor. -Furthermore, disassociation can be made with usb_unanchor_urb() +Furthermore, disassociation can be made with :c:func:`usb_unanchor_urb` Operations on multitudes of URBs ================================ -usb_kill_anchored_urbs() ------------------------- +:c:func:`usb_kill_anchored_urbs` +-------------------------------- This function kills all URBs associated with an anchor. The URBs are called in the reverse temporal order they were submitted. This way no data can be reordered. -usb_unlink_anchored_urbs() --------------------------- +:c:func:`usb_unlink_anchored_urbs` +---------------------------------- + This function unlinks all URBs associated with an anchor. The URBs are processed in the reverse temporal order they were submitted. -This is similar to usb_kill_anchored_urbs(), but it will not sleep. +This is similar to :c:func:`usb_kill_anchored_urbs`, but it will not sleep. Therefore no guarantee is made that the URBs have been unlinked when the call returns. They may be unlinked later but will be unlinked in finite time. -usb_scuttle_anchored_urbs() ---------------------------- +:c:func:`usb_scuttle_anchored_urbs` +----------------------------------- All URBs of an anchor are unanchored en masse. -usb_wait_anchor_empty_timeout() -------------------------------- +:c:func:`usb_wait_anchor_empty_timeout` +--------------------------------------- This function waits for all URBs associated with an anchor to finish or a timeout, whichever comes first. Its return value will tell you whether the timeout was reached. -usb_anchor_empty() ------------------- +:c:func:`usb_anchor_empty` +-------------------------- Returns true if no URBs are associated with an anchor. Locking is the caller's responsibility. -usb_get_from_anchor() ---------------------- +:c:func:`usb_get_from_anchor` +----------------------------- Returns the oldest anchored URB of an anchor. The URB is unanchored and returned with a reference. As you may mix URBs to several diff --git a/Documentation/driver-api/usb/index.rst b/Documentation/driver-api/usb/index.rst index cf2fa2e8d236..5dfb04b2d730 100644 --- a/Documentation/driver-api/usb/index.rst +++ b/Documentation/driver-api/usb/index.rst @@ -6,6 +6,7 @@ Linux USB API usb gadget + anchors writing_usb_driver writing_musb_glue_layer |