Hi,
this patch adds support for reset_resume in cdc-acm. This function simply calls
tty_hangup() if there was any user of the tty at suspend time, and then calls
the normal resume function. Tested with a Samsung SGH-U900 device.
Without reset_resume, every time the system is hibernated during a PPP
connection, the device moves from ttyACMx to ttyACM(x+1), an it must be
unplugged and replugged in order for its original node ttyACMx to re-appear.
Instead, with reset_resume the device retains its node name across hibernation
cycles.
Regards,
Francesco
Signed-off-by: Francesco Lavra <francescolavra@xxxxxxxxxxxx>
--- a/drivers/usb/class/cdc-acm.c 2009-12-07 16:22:20.000000000 +0100
+++ b/drivers/usb/class/cdc-acm.c 2009-12-07 16:32:14.000000000 +0100
@@ -1460,6 +1460,19 @@ err_out:
return rv;
}
+static int acm_reset_resume(struct usb_interface *intf)
+{
+ struct acm *acm = usb_get_intfdata(intf);
+ struct tty_struct *tty;
+
+ tty = tty_port_tty_get(&acm->port);
+ if (tty) {
+ tty_hangup(tty);
+ tty_kref_put(tty);
+ }
+ return acm_resume(intf);
+}
+
#endif /* CONFIG_PM */
/*
* USB driver structure.
@@ -1546,6 +1559,7 @@ static struct usb_driver acm_driver = {
#ifdef CONFIG_PM
.suspend = acm_suspend,
.resume = acm_resume,
+ .reset_resume = acm_reset_resume,
#endif
.id_table = acm_ids,
#ifdef CONFIG_PM
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