Commit 1157f69b authored by Wesley W. Terpstra's avatar Wesley W. Terpstra Committed by Greg Kroah-Hartman

usb-serial: add support for USB Wishbone-serial adapters

Wishbone is an open hardware SoC bus commonly used in FPGA
designs. Bus access can be serialized using the Etherbone
protocol <http://www.ohwr.org/projects/etherbone-core>.

This driver is intended to be used with devices which attach
their internal Wishbone bus to a USB serial interface using
the Etherbone protocol. A userspace library is required to
speak the protocol made available by this driver as ttyUSBx.
Signed-off-by: 's avatarWesley W. Terpstra <w.terpstra@gsi.de>
Signed-off-by: 's avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0fcb9989
...@@ -667,6 +667,23 @@ config USB_SERIAL_ZIO ...@@ -667,6 +667,23 @@ config USB_SERIAL_ZIO
To compile this driver as a module, choose M here: the To compile this driver as a module, choose M here: the
module will be called zio. module will be called zio.
config USB_SERIAL_WISHBONE
tristate "USB-Wishbone adapter interface driver"
help
Say Y here if you want to use a USB attached Wishbone bus.
Wishbone is an open hardware SoC bus commonly used in FPGA
designs. Bus access can be serialized using the Etherbone
protocol <http://www.ohwr.org/projects/etherbone-core>.
This driver is intended to be used with devices which attach
their internal Wishbone bus to a USB serial interface using
the Etherbone protocol. A userspace library is required to
speak the protocol made available by this driver as ttyUSBx.
To compile this driver as a module, choose M here: the
module will be called wishbone-serial.
config USB_SERIAL_ZTE config USB_SERIAL_ZTE
tristate "ZTE USB serial driver" tristate "ZTE USB serial driver"
help help
......
...@@ -58,6 +58,7 @@ obj-$(CONFIG_USB_SERIAL_SYMBOL) += symbolserial.o ...@@ -58,6 +58,7 @@ obj-$(CONFIG_USB_SERIAL_SYMBOL) += symbolserial.o
obj-$(CONFIG_USB_SERIAL_WWAN) += usb_wwan.o obj-$(CONFIG_USB_SERIAL_WWAN) += usb_wwan.o
obj-$(CONFIG_USB_SERIAL_TI) += ti_usb_3410_5052.o obj-$(CONFIG_USB_SERIAL_TI) += ti_usb_3410_5052.o
obj-$(CONFIG_USB_SERIAL_VISOR) += visor.o obj-$(CONFIG_USB_SERIAL_VISOR) += visor.o
obj-$(CONFIG_USB_SERIAL_WISHBONE) += wishbone-serial.o
obj-$(CONFIG_USB_SERIAL_WHITEHEAT) += whiteheat.o obj-$(CONFIG_USB_SERIAL_WHITEHEAT) += whiteheat.o
obj-$(CONFIG_USB_SERIAL_XIRCOM) += keyspan_pda.o obj-$(CONFIG_USB_SERIAL_XIRCOM) += keyspan_pda.o
obj-$(CONFIG_USB_SERIAL_VIVOPAY_SERIAL) += vivopay-serial.o obj-$(CONFIG_USB_SERIAL_VIVOPAY_SERIAL) += vivopay-serial.o
......
/*
* 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
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/init.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,
0, 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");
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