diff options
Diffstat (limited to 'drivers/usb/core/usb.h')
| -rw-r--r-- | drivers/usb/core/usb.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h index 1c528c1bf0b..fb7d8fcb455 100644 --- a/drivers/usb/core/usb.h +++ b/drivers/usb/core/usb.h @@ -38,6 +38,15 @@ extern char *usb_cache_string(struct usb_device *udev, int index); extern int usb_set_configuration(struct usb_device *dev, int configuration); extern int usb_choose_configuration(struct usb_device *udev); +static inline unsigned usb_get_max_power(struct usb_device *udev, + struct usb_host_config *c) +{ + /* SuperSpeed power is in 8 mA units; others are in 2 mA units */ + unsigned mul = (udev->speed == USB_SPEED_SUPER ? 8 : 2); + + return c->desc.bMaxPower * mul; +} + extern void usb_kick_khubd(struct usb_device *dev); extern int usb_match_one_id_intf(struct usb_device *dev, struct usb_host_interface *intf, |