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Commit 4e67185a authored by Juha Yrjola's avatar Juha Yrjola Committed by Greg Kroah-Hartman
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[PATCH] add usb transceiver set_suspend() method 



When a USB device is put into suspend mode, the current drawn from VBUS
has to be less than 500 uA. Some transceivers need to be put into a
special power-saving mode to accomplish this, and won't have a separate
OTG driver handling that.

This adds a suspend method to the "otg_transceiver" struct -- misnamed,
it's not only for OTG -- and calls it from the OMAP UDC driver.

Signed-off-by: default avatarJuha Yrj?l? <juha.yrjola@nokia.com>
Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent f37be9b9

drivers/usb/gadget/omap_udc.c

+4 −0
Original line number Diff line number Diff line
@@ -1788,8 +1788,12 @@ static void devstate_irq(struct omap_udc *udc, u16 irq_src) 
					udc->driver->suspend(&udc->gadget);

					spin_lock(&udc->lock);

				}

				if (udc->transceiver)

					otg_set_suspend(udc->transceiver, 1);

			} else {

				VDBG("resume\n");

				if (udc->transceiver)

					otg_set_suspend(udc->transceiver, 0);

				if (udc->gadget.speed == USB_SPEED_FULL

						&& udc->driver->resume) {

					spin_unlock(&udc->lock);

include/linux/usb_otg.h

+13 −0
Original line number Diff line number Diff line
@@ -63,6 +63,10 @@ struct otg_transceiver { 
	int	(*set_power)(struct otg_transceiver *otg,

				unsigned mA);



	/* for non-OTG B devices: set transceiver into suspend mode */

	int	(*set_suspend)(struct otg_transceiver *otg,

				int suspend);



	/* for B devices only:  start session with A-Host */

	int	(*start_srp)(struct otg_transceiver *otg);
@@ -107,6 +111,15 @@ otg_set_power(struct otg_transceiver *otg, unsigned mA) 
	return otg->set_power(otg, mA);

}



static inline int

otg_set_suspend(struct otg_transceiver *otg, int suspend)

{

	if (otg->set_suspend != NULL)

		return otg->set_suspend(otg, suspend);

	else

		return 0;

}



static inline int

otg_start_srp(struct otg_transceiver *otg)

{