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

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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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Tomoya MORINAGA 2012-02-03 16:14:18 +09:00 • committed by Felipe Balbi

parent dd63180b75

commit 637b78eb31

1 changed files with 83 additions and 4 deletions

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drivers/usb/gadget/pch_udc.c

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