2 * USB Serial Converter Bus specific functions
4 * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/tty.h>
14 #include <linux/slab.h>
15 #include <linux/module.h>
16 #include <linux/usb.h>
17 #include <linux/usb/serial.h>
19 static int usb_serial_device_match(struct device *dev,
20 struct device_driver *drv)
22 struct usb_serial_driver *driver;
23 const struct usb_serial_port *port;
26 * drivers are already assigned to ports in serial_probe so it's
27 * a simple check here.
29 port = to_usb_serial_port(dev);
33 driver = to_usb_serial_driver(drv);
35 if (driver == port->serial->type)
41 static ssize_t port_number_show(struct device *dev,
42 struct device_attribute *attr, char *buf)
44 struct usb_serial_port *port = to_usb_serial_port(dev);
46 return sprintf(buf, "%d\n", port->port_number);
48 static DEVICE_ATTR_RO(port_number);
50 static int usb_serial_device_probe(struct device *dev)
52 struct usb_serial_driver *driver;
53 struct usb_serial_port *port;
57 port = to_usb_serial_port(dev);
63 /* make sure suspend/resume doesn't race against port_probe */
64 retval = usb_autopm_get_interface(port->serial->interface);
68 driver = port->serial->type;
69 if (driver->port_probe) {
70 retval = driver->port_probe(port);
72 goto exit_with_autopm;
75 retval = device_create_file(dev, &dev_attr_port_number);
77 if (driver->port_remove)
78 retval = driver->port_remove(port);
79 goto exit_with_autopm;
83 tty_register_device(usb_serial_tty_driver, minor, dev);
84 dev_info(&port->serial->dev->dev,
85 "%s converter now attached to ttyUSB%d\n",
86 driver->description, minor);
89 usb_autopm_put_interface(port->serial->interface);
94 static int usb_serial_device_remove(struct device *dev)
96 struct usb_serial_driver *driver;
97 struct usb_serial_port *port;
101 port = to_usb_serial_port(dev);
105 /* make sure suspend/resume doesn't race against port_remove */
106 usb_autopm_get_interface(port->serial->interface);
109 tty_unregister_device(usb_serial_tty_driver, minor);
111 device_remove_file(&port->dev, &dev_attr_port_number);
113 driver = port->serial->type;
114 if (driver->port_remove)
115 retval = driver->port_remove(port);
117 dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
118 driver->description, minor);
120 usb_autopm_put_interface(port->serial->interface);
124 static ssize_t new_id_store(struct device_driver *driver,
125 const char *buf, size_t count)
127 struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
128 ssize_t retval = usb_store_new_id(&usb_drv->dynids, driver, buf, count);
130 if (retval >= 0 && usb_drv->usb_driver != NULL)
131 retval = usb_store_new_id(&usb_drv->usb_driver->dynids,
132 &usb_drv->usb_driver->drvwrap.driver,
137 static ssize_t new_id_show(struct device_driver *driver, char *buf)
139 struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
141 return usb_show_dynids(&usb_drv->dynids, buf);
143 static DRIVER_ATTR_RW(new_id);
145 static struct attribute *usb_serial_drv_attrs[] = {
146 &driver_attr_new_id.attr,
149 ATTRIBUTE_GROUPS(usb_serial_drv);
151 static void free_dynids(struct usb_serial_driver *drv)
153 struct usb_dynid *dynid, *n;
155 spin_lock(&drv->dynids.lock);
156 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
157 list_del(&dynid->node);
160 spin_unlock(&drv->dynids.lock);
163 struct bus_type usb_serial_bus_type = {
164 .name = "usb-serial",
165 .match = usb_serial_device_match,
166 .probe = usb_serial_device_probe,
167 .remove = usb_serial_device_remove,
168 .drv_groups = usb_serial_drv_groups,
171 int usb_serial_bus_register(struct usb_serial_driver *driver)
175 driver->driver.bus = &usb_serial_bus_type;
176 spin_lock_init(&driver->dynids.lock);
177 INIT_LIST_HEAD(&driver->dynids.list);
179 retval = driver_register(&driver->driver);
184 void usb_serial_bus_deregister(struct usb_serial_driver *driver)
187 driver_unregister(&driver->driver);