1 files changed, 134 insertions, 0 deletions
diff --git a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
new file mode 100644
index 000000000000..2f612c2d894b
--- /dev/null
+++ b/drivers/usb/serial/bus.c
@@ -0,0 +1,134 @@
+/*
+ * USB Serial Converter Bus specific functions
+ *
+ * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com)
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License version
+ *	2 as published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include "usb-serial.h"
+
+static int usb_serial_device_match (struct device *dev, struct device_driver *drv)
+{
+	struct usb_serial_device_type *driver;
+	const struct usb_serial_port *port;
+
+	/*
+	 * drivers are already assigned to ports in serial_probe so it's
+	 * a simple check here.
+	 */
+	port = to_usb_serial_port(dev);
+	if (!port)
+		return 0;
+
+	driver = to_usb_serial_driver(drv);
+
+	if (driver == port->serial->type)
+		return 1;
+
+	return 0;
+}
+
+struct bus_type usb_serial_bus_type = {
+	.name =		"usb-serial",
+	.match =	usb_serial_device_match,
+};
+
+static int usb_serial_device_probe (struct device *dev)
+{
+	struct usb_serial_device_type *driver;
+	struct usb_serial_port *port;
+	int retval = 0;
+	int minor;
+
+	port = to_usb_serial_port(dev);
+	if (!port) {
+		retval = -ENODEV;
+		goto exit;
+	}
+
+	driver = port->serial->type;
+	if (driver->port_probe) {
+		if (!try_module_get(driver->owner)) {
+			dev_err(dev, "module get failed, exiting\n");
+			retval = -EIO;
+			goto exit;
+		}
+		retval = driver->port_probe (port);
+		module_put(driver->owner);
+		if (retval)
+			goto exit;
+	}
+
+	minor = port->number;
+	tty_register_device (usb_serial_tty_driver, minor, dev);
+	dev_info(&port->serial->dev->dev, 
+		 "%s converter now attached to ttyUSB%d\n",
+		 driver->name, minor);
+
+exit:
+	return retval;
+}
+
+static int usb_serial_device_remove (struct device *dev)
+{
+	struct usb_serial_device_type *driver;
+	struct usb_serial_port *port;
+	int retval = 0;
+	int minor;
+
+	port = to_usb_serial_port(dev);
+	if (!port) {
+		return -ENODEV;
+	}
+
+	driver = port->serial->type;
+	if (driver->port_remove) {
+		if (!try_module_get(driver->owner)) {
+			dev_err(dev, "module get failed, exiting\n");
+			retval = -EIO;
+			goto exit;
+		}
+		retval = driver->port_remove (port);
+		module_put(driver->owner);
+	}
+exit:
+	minor = port->number;
+	tty_unregister_device (usb_serial_tty_driver, minor);
+	dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
+		 driver->name, minor);
+
+	return retval;
+}
+
+int usb_serial_bus_register(struct usb_serial_device_type *device)
+{
+	int retval;
+
+	if (device->short_name)
+		device->driver.name = (char *)device->short_name;
+	else
+		device->driver.name = (char *)device->name;
+	device->driver.bus = &usb_serial_bus_type;
+	device->driver.probe = usb_serial_device_probe;
+	device->driver.remove = usb_serial_device_remove;
+	device->driver.owner = device->owner;
+
+	retval = driver_register(&device->driver);
+
+	return retval;
+}
+
+void usb_serial_bus_deregister(struct usb_serial_device_type *device)
+{
+	driver_unregister (&device->driver);
+}
+