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authorJuha Yrj?l? <juha.yrjola@nokia.com>2005-10-16 15:47:04 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2005-10-28 16:47:45 -0700
commit4e67185a7ac3ecb1710e636e2f7e318e99298c7a (patch)
tree035fa1745baa6490425d44dc126c72ddc366497f
parentf37be9b9be3ebc02d2d075d7f53f7802f3e005db (diff)
[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: Juha Yrj?l? <juha.yrjola@nokia.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/usb/gadget/omap_udc.c4
-rw-r--r--include/linux/usb_otg.h13
2 files changed, 17 insertions, 0 deletions
diff --git a/drivers/usb/gadget/omap_udc.c b/drivers/usb/gadget/omap_udc.c
index de8a89ae4bc..b42799bc747 100644
--- a/drivers/usb/gadget/omap_udc.c
+++ b/drivers/usb/gadget/omap_udc.c
@@ -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);
diff --git a/include/linux/usb_otg.h b/include/linux/usb_otg.h
index c6683146e9b..f827f6e203c 100644
--- a/include/linux/usb_otg.h
+++ b/include/linux/usb_otg.h
@@ -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);
@@ -108,6 +112,15 @@ otg_set_power(struct otg_transceiver *otg, unsigned 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)
{
return otg->start_srp(otg);