[ 034/167] [PATCH] usb: gadget: udc-core: stop UDC on device-initiateddisconnect

From: Ben Hutchings
Date: Wed May 09 2012 - 02:31:11 EST

3.2-stable review patch. If anyone has any objections, please let me know.


From: Felipe Balbi <balbi@xxxxxx>

commit 6d258a4c42089229b855fd706622029decf316d6 upstream.

When we want to do device-initiated disconnect,
let's make sure we stop the UDC in order to
e.g. allow lower power states to be achieved by
turning off unnecessary clocks and/or stoping

When reconnecting, call ->udc_start() again to
make sure UDC is reinitialized.

Signed-off-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
drivers/usb/gadget/udc-core.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c
index 56da49f..c261887 100644
--- a/drivers/usb/gadget/udc-core.c
+++ b/drivers/usb/gadget/udc-core.c
@@ -411,8 +411,12 @@ static ssize_t usb_udc_softconn_store(struct device *dev,
struct usb_udc *udc = container_of(dev, struct usb_udc, dev);

if (sysfs_streq(buf, "connect")) {
+ if (udc_is_newstyle(udc))
+ usb_gadget_udc_start(udc->gadget, udc->driver);
} else if (sysfs_streq(buf, "disconnect")) {
+ if (udc_is_newstyle(udc))
+ usb_gadget_udc_stop(udc->gadget, udc->driver);
} else {
dev_err(dev, "unsupported command '%s'\n", buf);

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