usb: gadget: pch_udc: Detecting VBUS through GPIO

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Problem:
 In USB Suspend, pch_udc handles 'disconnect'.

Root cause:
 The current pch_udc is not monitoring VBUS.
 When USB cable is disconnected, USB Device Controller generates
 an interrupt of USB Suspend.
 pch_udc cannot distinguish it is USB Suspend or disconnect.
 Therefore, pch_udc handles 'disconnect' after an interrupt of
 USB Suspend happend.

Solution:
 VBUS is detected through GPIO.
 After an interrupt produced USB Suspend, if VBUS is Low,
 pch_udc handles 'disconnect'.
 If VBUS is High, pch_udc handles 'suspend'.

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 16:35:26 +09:00 • committed by Felipe Balbi

parent 20edfbb6a1

commit dd63180b75

1 changed files with 142 additions and 3 deletions

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drivers/usb/gadget/pch_udc.c

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