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usb: add device connection/disconnection detection

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Provide a function to detect USB device insertion/removal in order to
avoid having to do USB enumeration in a tight loop when trying to detect
peripheral hotplugging.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>

Reviewed-by: Stefan Reinauer <reinauer@chromium.org>
Tested-by: Stefan Reinauer <reinauer@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Vincent Palatin 2015-05-04 11:30:54 -06:00 • committed by Simon Glass
parent 6a72e804a2
commit 08f3bb0bcd
3 changed files with 29 additions and 1 deletions
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26
common/usb.c
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@ -148,6 +148,32 @@ int usb_stop(void)
return 0;
}
/******************************************************************************
* Detect if a USB device has been plugged or unplugged.
*/
int usb_detect_change(void)
{
int i, j;
int change = 0;
for (j = 0; j < USB_MAX_DEVICE; j++) {
for (i = 0; i < usb_dev[j].maxchild; i++) {
struct usb_port_status status;
if (usb_get_port_status(&usb_dev[j], i + 1,
&status) < 0)
/* USB request failed */
continue;
if (le16_to_cpu(status.wPortChange) &
USB_PORT_STAT_C_CONNECTION)
change++;
}
}
return change;
}
/*
* disables the asynch behaviour of the control message. This is used for data
* transfers that uses the exclusiv access to the control and bulk messages.