zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/drivers/usb/serial/bus.c b/ap/os/linux/linux-3.4.x/drivers/usb/serial/bus.c
new file mode 100644
index 0000000..358d2d6
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/drivers/usb/serial/bus.c
@@ -0,0 +1,188 @@
+/*
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/tty.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/usb.h>
+#include <linux/usb/serial.h>
+
+static int usb_serial_device_match(struct device *dev,
+ struct device_driver *drv)
+{
+ struct usb_serial_driver *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;
+}
+
+static ssize_t show_port_number(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct usb_serial_port *port = to_usb_serial_port(dev);
+
+ return sprintf(buf, "%d\n", port->number - port->serial->minor);
+}
+
+static DEVICE_ATTR(port_number, S_IRUGO, show_port_number, NULL);
+
+static int usb_serial_device_probe(struct device *dev)
+{
+ struct usb_serial_driver *driver;
+ struct usb_serial_port *port;
+ struct device *tty_dev;
+ 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) {
+ retval = driver->port_probe(port);
+ if (retval)
+ goto exit;
+ }
+
+ retval = device_create_file(dev, &dev_attr_port_number);
+ if (retval) {
+ if (driver->port_remove)
+ driver->port_remove(port);
+ goto exit;
+ }
+
+ minor = port->number;
+ tty_dev = tty_register_device(usb_serial_tty_driver, minor, dev);
+ if (IS_ERR(tty_dev)) {
+ retval = PTR_ERR(tty_dev);
+ device_remove_file(dev, &dev_attr_port_number);
+ if (driver->port_remove)
+ driver->port_remove(port);
+ goto exit;
+ }
+
+ dev_info(&port->serial->dev->dev,
+ "%s converter now attached to ttyUSB%d\n",
+ driver->description, minor);
+
+exit:
+ return retval;
+}
+
+static int usb_serial_device_remove(struct device *dev)
+{
+ struct usb_serial_driver *driver;
+ struct usb_serial_port *port;
+ int retval = 0;
+ int minor;
+
+ port = to_usb_serial_port(dev);
+ if (!port)
+ return -ENODEV;
+
+ device_remove_file(&port->dev, &dev_attr_port_number);
+
+ driver = port->serial->type;
+ if (driver->port_remove)
+ retval = driver->port_remove(port);
+
+ minor = port->number;
+ tty_unregister_device(usb_serial_tty_driver, minor);
+ dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
+ driver->description, minor);
+
+ return retval;
+}
+
+#ifdef CONFIG_HOTPLUG
+static ssize_t store_new_id(struct device_driver *driver,
+ const char *buf, size_t count)
+{
+ struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
+ ssize_t retval = usb_store_new_id(&usb_drv->dynids, driver, buf, count);
+
+ if (retval >= 0 && usb_drv->usb_driver != NULL)
+ retval = usb_store_new_id(&usb_drv->usb_driver->dynids,
+ &usb_drv->usb_driver->drvwrap.driver,
+ buf, count);
+ return retval;
+}
+
+static struct driver_attribute drv_attrs[] = {
+ __ATTR(new_id, S_IWUSR, NULL, store_new_id),
+ __ATTR_NULL,
+};
+
+static void free_dynids(struct usb_serial_driver *drv)
+{
+ struct usb_dynid *dynid, *n;
+
+ spin_lock(&drv->dynids.lock);
+ list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
+ list_del(&dynid->node);
+ kfree(dynid);
+ }
+ spin_unlock(&drv->dynids.lock);
+}
+
+#else
+static struct driver_attribute drv_attrs[] = {
+ __ATTR_NULL,
+};
+static inline void free_dynids(struct usb_serial_driver *drv)
+{
+}
+#endif
+
+struct bus_type usb_serial_bus_type = {
+ .name = "usb-serial",
+ .match = usb_serial_device_match,
+ .probe = usb_serial_device_probe,
+ .remove = usb_serial_device_remove,
+ .drv_attrs = drv_attrs,
+};
+
+int usb_serial_bus_register(struct usb_serial_driver *driver)
+{
+ int retval;
+
+ driver->driver.bus = &usb_serial_bus_type;
+ spin_lock_init(&driver->dynids.lock);
+ INIT_LIST_HEAD(&driver->dynids.list);
+
+ retval = driver_register(&driver->driver);
+
+ return retval;
+}
+
+void usb_serial_bus_deregister(struct usb_serial_driver *driver)
+{
+ free_dynids(driver);
+ driver_unregister(&driver->driver);
+}
+