b8a261b59c
This fixes a sparse warning where we should be using NULL instead of 0 Cc: Wesley W. Terpstra <w.terpstra@gsi.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/*
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* USB Wishbone-Serial adapter driver
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*
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* Copyright (C) 2013 Wesley W. Terpstra <w.terpstra@gsi.de>
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* Copyright (C) 2013 GSI Helmholtz Centre for Heavy Ion Research GmbH
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/tty.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#include <linux/uaccess.h>
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#define GSI_VENDOR_OPENCLOSE 0xB0
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE_AND_INTERFACE_INFO(0x1D50, 0x6062, 0xFF, 0xFF, 0xFF) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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/*
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* Etherbone must be told that a new stream has begun before data arrives.
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* This is necessary to restart the negotiation of Wishbone bus parameters.
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* Similarly, when the stream ends, Etherbone must be told so that the cycle
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* line can be driven low in the case that userspace failed to do so.
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*/
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static int usb_gsi_openclose(struct usb_serial_port *port, int value)
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{
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struct usb_device *dev = port->serial->dev;
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return usb_control_msg(
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dev,
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usb_sndctrlpipe(dev, 0), /* Send to EP0OUT */
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GSI_VENDOR_OPENCLOSE,
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USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
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value, /* wValue = device is open(1) or closed(0) */
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port->serial->interface->cur_altsetting->desc.bInterfaceNumber,
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NULL, 0, /* There is no data stage */
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5000); /* Timeout till operation fails */
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}
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static int wishbone_serial_open(struct tty_struct *tty,
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struct usb_serial_port *port)
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{
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int retval;
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retval = usb_gsi_openclose(port, 1);
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if (retval) {
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dev_err(&port->serial->dev->dev,
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"Could not mark device as open (%d)\n",
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retval);
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return retval;
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}
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retval = usb_serial_generic_open(tty, port);
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if (retval)
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usb_gsi_openclose(port, 0);
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return retval;
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}
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static void wishbone_serial_close(struct usb_serial_port *port)
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{
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usb_serial_generic_close(port);
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usb_gsi_openclose(port, 0);
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}
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static struct usb_serial_driver wishbone_serial_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "wishbone_serial",
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},
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.id_table = id_table,
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.num_ports = 1,
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.open = &wishbone_serial_open,
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.close = &wishbone_serial_close,
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};
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static struct usb_serial_driver * const serial_drivers[] = {
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&wishbone_serial_device, NULL
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};
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module_usb_serial_driver(serial_drivers, id_table);
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MODULE_AUTHOR("Wesley W. Terpstra <w.terpstra@gsi.de>");
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MODULE_DESCRIPTION("USB Wishbone-Serial adapter");
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MODULE_LICENSE("GPL");
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