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| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2012-07-05 17:17:24 -0700 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2012-07-11 07:06:48 -0400 |
| commit | 024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb (patch) | |
| tree | 3ad556877608c58bd7844f82810dfc0d471d4f63 /include/linux/usb.h | |
| parent | f74631e3426474183389e55f703797bd965cd356 (diff) | |
| download | lwn-024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb.tar.gz lwn-024f117c2f3c4bb5df6e6696b709e0f3ed7e5dbb.zip | |
USB: Add a sysfs file to show LTM capabilities.
USB 3.0 devices can optionally support Latency Tolerance Messaging
(LTM). Add a new sysfs file in the device directory to show whether a
device is LTM capable. This file will be present for both USB 2.0 and
USB 3.0 devices.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'include/linux/usb.h')
| -rw-r--r-- | include/linux/usb.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/usb.h b/include/linux/usb.h index f29831bad235..f8506ed0f97b 100644 --- a/include/linux/usb.h +++ b/include/linux/usb.h @@ -636,6 +636,14 @@ extern void usb_unlocked_enable_lpm(struct usb_device *udev); extern int usb_disable_ltm(struct usb_device *udev); extern void usb_enable_ltm(struct usb_device *udev); +static inline bool usb_device_supports_ltm(struct usb_device *udev) +{ + if (udev->speed != USB_SPEED_SUPER || !udev->bos || !udev->bos->ss_cap) + return false; + return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT; +} + + /*-------------------------------------------------------------------------*/ /* for drivers using iso endpoints */ |