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USB: serial: hook up reset_resume callback

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The callback is now hooked up for any USB to serial driver that wants
it.  We only register the callback if any of the usb-serial structures
want it, this keeps the USB core happy.

Thanks to Alan Stern for the ideas on how to do this.

Cc: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2012-05-15 15:40:00 -07:00
parent 09c94e628a
commit 7186364e46
2 changed files with 25 additions and 2 deletions
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24
drivers/usb/serial/usb-serial.c
View file

@ -1,7 +1,7 @@
/*
* USB Serial Converter driver
*
* Copyright (C) 1999 - 2005 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 1999 - 2012 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (C) 2000 Peter Berger (pberger@brimson.com)
* Copyright (C) 2000 Al Borchers (borchers@steinerpoint.com)
*
@ -1166,6 +1166,20 @@ int usb_serial_resume(struct usb_interface *intf)
}
EXPORT_SYMBOL(usb_serial_resume);
static int usb_serial_reset_resume(struct usb_interface *intf)
{
struct usb_serial *serial = usb_get_intfdata(intf);
int rv;
serial->suspending = 0;
if (serial->type->reset_resume)
rv = serial->type->reset_resume(serial);
else
rv = usb_serial_generic_resume(serial);
return rv;
}
static const struct tty_operations serial_ops = {
.open = serial_open,
.close = serial_close,
@ -1403,6 +1417,14 @@ int usb_serial_register_drivers(struct usb_serial_driver *const serial_drivers[]
udriver->resume = usb_serial_resume;
udriver->probe = usb_serial_probe;
udriver->disconnect = usb_serial_disconnect;
/* we only set the reset_resume field if the serial_driver has one */
for (sd = serial_drivers; *sd; ++sd) {
if ((*sd)->reset_resume)
udriver->reset_resume = usb_serial_reset_resume;
break;
}
rc = usb_register(udriver);
if (rc)
return rc;

3
include/linux/usb/serial.h
View file

@ -1,7 +1,7 @@
/*
* USB Serial Converter stuff
*
* Copyright (C) 1999 - 2005
* Copyright (C) 1999 - 2012
* Greg Kroah-Hartman (greg@kroah.com)
*
* This program is free software; you can redistribute it and/or modify
@ -249,6 +249,7 @@ struct usb_serial_driver {
int (*suspend)(struct usb_serial *serial, pm_message_t message);
int (*resume)(struct usb_serial *serial);
int (*reset_resume)(struct usb_serial *serial);
/* serial function calls */
/* Called by console and by the tty layer */