From: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Date: Fri, 3 Feb 2012 07:14:18 +0000 (+0900)
Subject: usb: gadget: pch_udc: Detecting VBUS through GPIO with interrupt
X-Git-Tag: v3.4-rc1~184^2~22^2~39^2~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=637b78eb31e0b167ed913f1750bb645dfeda38f0;p=pandora-kernel.git

usb: gadget: pch_udc: Detecting VBUS through GPIO with interrupt

Problem:
 pch_udc continues operation even if VBUS becomes Low.
 pch_udc performs D+ pulling up before VBUS becomes High.
 USB device should be controlled according to VBUS state.

Root cause:
 The current pch_udc is not always monitoring VBUS.

Solution:
 The change of VBUS is detected using an interrupt of GPIO.
 If VBUS became Low, pch_udc handles 'disconnect'.
 After VBUS became High, a pull improves D+, and pch_udc
 handles 'connect'.

[ balbi@ti.com : make it actually compile ]

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@gmail.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
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