diff options
| -rw-r--r-- | sys/dev/usb/uhcivar.h | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/sys/dev/usb/uhcivar.h b/sys/dev/usb/uhcivar.h index 5183f84..fd9425a 100644 --- a/sys/dev/usb/uhcivar.h +++ b/sys/dev/usb/uhcivar.h @@ -41,13 +41,14 @@ /* * To avoid having 1024 TDs for each isochronous transfer we introduce * a virtual frame list. Every UHCI_VFRAMELIST_COUNT entries in the real - * frame list points to a non-active TD. These, in turn, which form the + * frame list points to a non-active TD. These, in turn, form the * starts of the virtual frame list. This also has the advantage that it - * simplifies linking in/out TD/QH in the schedule. + * simplifies linking in/out of TDs/QHs in the schedule. * Furthermore, initially each of the inactive TDs point to an inactive * QH that forms the start of the interrupt traffic for that slot. * Each of these QHs point to the same QH that is the start of control - * traffic. + * traffic. This QH points at another QH which is the start of the + * bulk traffic. * * UHCI_VFRAMELIST_COUNT should be a power of 2 and <= UHCI_FRAMELIST_COUNT. */ @@ -168,7 +169,7 @@ typedef struct uhci_softc { LIST_HEAD(, uhci_intr_info) sc_intrhead; /* Info for the root hub interrupt channel. */ - int sc_ival; /* time between root hug intrs */ + int sc_ival; /* time between root hub intrs */ usbd_xfer_handle sc_has_timo; /* root hub interrupt transfer */ char sc_vflock; /* for lock virtual frame list */ @@ -183,7 +184,7 @@ typedef struct uhci_softc { void *sc_shutdownhook; /* cookie from shutdown hook */ #endif - device_ptr_t sc_child; /* /dev/usb device */ + device_ptr_t sc_child; /* /dev/usb# device */ } uhci_softc_t; usbd_status uhci_init(uhci_softc_t *); |
