91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* USB Wishbone-Serial adapter driver
|
|
*
|
|
* Copyright (C) 2013 Wesley W. Terpstra <w.terpstra@gsi.de>
|
|
* Copyright (C) 2013 GSI Helmholtz Centre for Heavy Ion Research GmbH
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/tty.h>
|
|
#include <linux/module.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/usb/serial.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#define GSI_VENDOR_OPENCLOSE 0xB0
|
|
|
|
static const struct usb_device_id id_table[] = {
|
|
{ USB_DEVICE_AND_INTERFACE_INFO(0x1D50, 0x6062, 0xFF, 0xFF, 0xFF) },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(usb, id_table);
|
|
|
|
/*
|
|
* Etherbone must be told that a new stream has begun before data arrives.
|
|
* This is necessary to restart the negotiation of Wishbone bus parameters.
|
|
* Similarly, when the stream ends, Etherbone must be told so that the cycle
|
|
* line can be driven low in the case that userspace failed to do so.
|
|
*/
|
|
static int usb_gsi_openclose(struct usb_serial_port *port, int value)
|
|
{
|
|
struct usb_device *dev = port->serial->dev;
|
|
|
|
return usb_control_msg(
|
|
dev,
|
|
usb_sndctrlpipe(dev, 0), /* Send to EP0OUT */
|
|
GSI_VENDOR_OPENCLOSE,
|
|
USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE,
|
|
value, /* wValue = device is open(1) or closed(0) */
|
|
port->serial->interface->cur_altsetting->desc.bInterfaceNumber,
|
|
NULL, 0, /* There is no data stage */
|
|
5000); /* Timeout till operation fails */
|
|
}
|
|
|
|
static int wishbone_serial_open(struct tty_struct *tty,
|
|
struct usb_serial_port *port)
|
|
{
|
|
int retval;
|
|
|
|
retval = usb_gsi_openclose(port, 1);
|
|
if (retval) {
|
|
dev_err(&port->serial->dev->dev,
|
|
"Could not mark device as open (%d)\n",
|
|
retval);
|
|
return retval;
|
|
}
|
|
|
|
retval = usb_serial_generic_open(tty, port);
|
|
if (retval)
|
|
usb_gsi_openclose(port, 0);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void wishbone_serial_close(struct usb_serial_port *port)
|
|
{
|
|
usb_serial_generic_close(port);
|
|
usb_gsi_openclose(port, 0);
|
|
}
|
|
|
|
static struct usb_serial_driver wishbone_serial_device = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "wishbone_serial",
|
|
},
|
|
.id_table = id_table,
|
|
.num_ports = 1,
|
|
.open = &wishbone_serial_open,
|
|
.close = &wishbone_serial_close,
|
|
};
|
|
|
|
static struct usb_serial_driver * const serial_drivers[] = {
|
|
&wishbone_serial_device, NULL
|
|
};
|
|
|
|
module_usb_serial_driver(serial_drivers, id_table);
|
|
|
|
MODULE_AUTHOR("Wesley W. Terpstra <w.terpstra@gsi.de>");
|
|
MODULE_DESCRIPTION("USB Wishbone-Serial adapter");
|
|
MODULE_LICENSE("GPL");
|