diff options
| author | Vincent Palatin <vpalatin@chromium.org> | 2015-05-04 11:30:54 -0600 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2015-05-14 18:49:33 -0600 |
| commit | 08f3bb0bcd84b57cc627ab0acda8aebacf27544e (patch) | |
| tree | bf28622599d080f8c11754a53a6f8387a5529177 /common/usb.c | |
| parent | 6a72e804a2b27e95cc7394876cc6a57f29e70817 (diff) | |
| download | u-boot-08f3bb0bcd84b57cc627ab0acda8aebacf27544e.tar.gz | |
usb: add device connection/disconnection detection
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>
Diffstat (limited to 'common/usb.c')
| -rw-r--r-- | common/usb.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/common/usb.c b/common/usb.c index 20c614cbcb..6283f3992c 100644 --- a/common/usb.c +++ b/common/usb.c @@ -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. |