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-rw-r--r--drivers/usb/serial/wishbone-serial.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/drivers/usb/serial/wishbone-serial.c b/drivers/usb/serial/wishbone-serial.c
new file mode 100644
index 000000000..ff4092f9b
--- /dev/null
+++ b/drivers/usb/serial/wishbone-serial.c
@@ -0,0 +1,90 @@
+// 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");