linux-kernel - [PATCH 0/2] usb: gadget: Fix gadget deactivaton feature

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Message-id: <1428395513-22229-1-git-send-email-r.baldyga@samsung.com>
Date:	Tue, 07 Apr 2015 10:31:51 +0200
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, m.szyprowski@...sung.com,
	andrzej.p@...sung.com, Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH 0/2] usb: gadget: Fix gadget deactivaton feature

Hi,

This patch set introduces two functions usb_gadget_deactivate() and
usb_gadget_activate(), designed to prevent udc-core from showing binded
gadget to host until it will be ready to work. It also makes
usb_function_deactivate()/activate() using these functions.

So far gadget deactivation was made by calling usb_gadget_disconnect(),
but since we have usb_gadget_connect() called after gadget->bind()
(in udc_bind_to_driver()) this method doesn't provide expected result.
Calling function usb_gadget_disconnect() before gadget connection doesn't
prevent udc-core from connecting gadget to driver - usb_gadget_disconnect()
call is ignored and gadget is connected regardless to it. This usually
results with errors, for example because we binded gadget with 0
configurations.

This patch set fixes this problem adding functions allowing to perform
effective gadget deactivation from gadget->bind().

Best regards,
Robert Baldyga

Robert Baldyga (2):
  usb: gadget: add usb_gadget_activate/deactivate functions
  usb: composite: fix usb_function_activate/deactivate functions

 drivers/usb/gadget/composite.c |   4 +-
 include/linux/usb/gadget.h     | 100 ++++++++++++++++++++++++++++++++++++++---
 2 files changed, 96 insertions(+), 8 deletions(-)

-- 
1.9.1

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