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- /*
- * 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/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");
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