diff options
Diffstat (limited to 'include/linux/usb/ch9.h')
| -rw-r--r-- | include/linux/usb/ch9.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h index d5da6c68c250..61b29057b054 100644 --- a/include/linux/usb/ch9.h +++ b/include/linux/usb/ch9.h @@ -605,8 +605,26 @@ struct usb_ss_ep_comp_descriptor { } __attribute__ ((packed)); #define USB_DT_SS_EP_COMP_SIZE 6 + /* Bits 4:0 of bmAttributes if this is a bulk endpoint */ -#define USB_SS_MAX_STREAMS(p) (1 << ((p) & 0x1f)) +static inline int +usb_ss_max_streams(const struct usb_ss_ep_comp_descriptor *comp) +{ + int max_streams; + + if (!comp) + return 0; + + max_streams = comp->bmAttributes & 0x1f; + + if (!max_streams) + return 0; + + max_streams = 1 << max_streams; + + return max_streams; +} + /* Bits 1:0 of bmAttributes if this is an isoc endpoint */ #define USB_SS_MULT(p) (1 + ((p) & 0x3)) |