From 37b5801e16d2e192fe2b20f4af33aa8c6e8786f3 Mon Sep 17 00:00:00 2001 From: Parirajan Muthalagu Date: Wed, 25 Aug 2010 16:33:26 +0530 Subject: [PATCH] USB Gadget: Verify VBUS current before setting the device self-powered bit Acked-by: David Brownell Acked-by: Linus Walleij Signed-off-by: Praveena Nadahally Signed-off-by: Parirajan Muthalagu Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/composite.c | 8 +++++++- include/linux/usb/ch9.h | 10 ++++++++++ 2 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 1160c55de7f2..eaa9a599df63 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1074,7 +1074,13 @@ static int composite_bind(struct usb_gadget *gadget) cdev->bufsiz = USB_BUFSIZ; cdev->driver = composite; - usb_gadget_set_selfpowered(gadget); + /* + * As per USB compliance update, a device that is actively drawing + * more than 100mA from USB must report itself as bus-powered in + * the GetStatus(DEVICE) call. + */ + if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW) + usb_gadget_set_selfpowered(gadget); /* interface and string IDs start at zero via kzalloc. * we force endpoints to start unassigned; few controller diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h index da2ed77d3e8d..b0f7e9f57176 100644 --- a/include/linux/usb/ch9.h +++ b/include/linux/usb/ch9.h @@ -808,4 +808,14 @@ enum usb_device_state { */ }; +/*-------------------------------------------------------------------------*/ + +/* + * As per USB compliance update, a device that is actively drawing + * more than 100mA from USB must report itself as bus-powered in + * the GetStatus(DEVICE) call. + * http://compliance.usb.org/index.asp?UpdateFile=Electrical&Format=Standard#34 + */ +#define USB_SELF_POWER_VBUS_MAX_DRAW 100 + #endif /* __LINUX_USB_CH9_H */ -- 2.20.1