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USB Gadget: Verify VBUS current before setting the device self-powered bit 

Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Praveena Nadahally <praveen.nadahally@stericsson.com>
Signed-off-by: Parirajan Muthalagu <parirajan.muthalagu@stericsson.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
hifive-unleashed-5.1
Parirajan Muthalagu 2010-08-25 16:33:26 +05:30 committed by Greg Kroah-Hartman
parent 90593899de
commit 37b5801e16
2 changed files with 17 additions and 1 deletions
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8
drivers/usb/gadget/composite.c
View File

@ -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

10
include/linux/usb/ch9.h
View File

@ -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 */