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USB: Add a sysfs file to show LTM capabilities.

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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>
This commit is contained in:
Sarah Sharp 2012-07-05 17:17:24 -07:00
parent f74631e342
commit 024f117c2f
4 changed files with 30 additions and 7 deletions
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8
include/linux/usb.h
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@ -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 */