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usbcore: check device's LPM capability 

Check device's LPM capability by examining the bmAttibutes field of the
USB2.0 Extension Descriptor.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Andiry Xu 2011-09-23 14:19:48 -07:00 committed by Greg Kroah-Hartman
parent 3148bf041d
commit 1ff4df5684
2 changed files with 10 additions and 2 deletions
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10
drivers/usb/core/hub.c
View File

@ -3083,8 +3083,14 @@ hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
goto fail;
}
if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201)
usb_get_bos_descriptor(udev);
if (udev->wusb == 0 && le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0201) {
retval = usb_get_bos_descriptor(udev);
if (!retval) {
if (udev->bos->ext_cap && (USB_LPM_SUPPORT &
le32_to_cpu(udev->bos->ext_cap->bmAttributes)))
udev->lpm_capable = 1;
}
}
retval = 0;
/* notify HCD that we have a device connected and addressed */

2
include/linux/usb.h
View File

@ -410,6 +410,7 @@ struct usb_tt;
* FIXME -- complete doc
* @authenticated: Crypto authentication passed
* @wusb: device is Wireless USB
* @lpm_capable: device supports LPM
* @string_langid: language ID for strings
* @product: iProduct string, if present (static)
* @manufacturer: iManufacturer string, if present (static)
@ -472,6 +473,7 @@ struct usb_device {
unsigned authorized:1;
unsigned authenticated:1;
unsigned wusb:1;
unsigned lpm_capable:1;
int string_langid;
/* static strings from the device */