USB: Add the USB 2.0 extension descriptor. (35e5437e) · Commits · 戴 / test

This device descriptor was added by the recent USB Link Power Management (LPM) ECN. It indicates whether the USB device supports LPM. This descriptor is grouped under a Binary Device Object Store (BOS) descriptor. Update the BOS comments to indicate any USB device (not just wireless USB devices) can implement BOS descriptors. Signed-off-by:

Sarah Sharp <sarah.a.sharp@intel.com> Acked-by:

David Brownell <dbrownell@users.sourceforge.net> Signed-off-by:

Greg Kroah-Hartman <gregkh@suse.de>

include/linux/usb/ch9.h

+11 −1

Original line number	Diff line number	Diff line
		@@ -455,7 +455,7 @@ struct usb_encryption_descriptor {

		/-------------------------------------------------------------------------/

		/* USB_DT_BOS: group of wireless capabilities */
		/* USB_DT_BOS: group of device-level capabilities */
		struct usb_bos_descriptor {
		__u8 bLength;
		__u8 bDescriptorType;
		@@ -501,6 +501,16 @@ struct usb_wireless_cap_descriptor { /* Ultra Wide Band */
		__u8 bReserved;
		} __attribute__((packed));

		#define USB_CAP_TYPE_EXT 2

		struct usb_ext_cap_descriptor { /* Link Power Management */
		__u8 bLength;
		__u8 bDescriptorType;
		__u8 bDevCapabilityType;
		__u8 bmAttributes;
		#define USB_LPM_SUPPORT (1 << 1) /* supports LPM */
		} __attribute__((packed));

		/-------------------------------------------------------------------------/

		/* USB_DT_WIRELESS_ENDPOINT_COMP: companion descriptor associated with

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