From a9548c55295a4268f9187e1ec93264a0682fa745 Mon Sep 17 00:00:00 2001 From: John Youn Date: Fri, 28 Apr 2017 12:55:20 +0400 Subject: usb: gadget: Allow a non-SuperSpeed gadget to support LPM This commit allows a gadget that does not support SuperSpeed to indicate that it supports LPM. It does this by setting the 'lpm_capable' flag in the gadget structure. If a gadget sets this, the composite gadget framework will set the bcdUSB to 0x0201 to indicate that this supports BOS descriptors, and also return a USB 2.0 Extension descriptor as part of the BOS descriptor set. See USB 2.0 LPM ECN Section 3. Signed-off-by: John Youn Signed-off-by: Sevak Arakelyan Signed-off-by: Felipe Balbi --- include/linux/usb/gadget.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index fbc22a39e7bc..3ee5f2a7c0b4 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -352,6 +352,8 @@ struct usb_gadget_ops { * @deactivated: True if gadget is deactivated - in deactivated state it cannot * be connected. * @connected: True if gadget is connected. + * @lpm_capable: If the gadget max_speed is FULL or HIGH, this flag + * indicates that it supports LPM as per the LPM ECN & errata. * * Gadgets have a mostly-portable "gadget driver" implementing device * functions, handling all usb configurations and interfaces. Gadget @@ -404,6 +406,7 @@ struct usb_gadget { unsigned is_selfpowered:1; unsigned deactivated:1; unsigned connected:1; + unsigned lpm_capable:1; }; #define work_to_gadget(w) (container_of((w), struct usb_gadget, work)) -- cgit v1.2.3