1/*
2 * USB Serial Converter Bus specific functions
3 *
4 * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com)
5 *
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.
9 */
10
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>
18
19static int usb_serial_device_match(struct device *dev,
20						struct device_driver *drv)
21{
22	struct usb_serial_driver *driver;
23	const struct usb_serial_port *port;
24
25	/*
26	 * drivers are already assigned to ports in serial_probe so it's
27	 * a simple check here.
28	 */
29	port = to_usb_serial_port(dev);
30	if (!port)
31		return 0;
32
33	driver = to_usb_serial_driver(drv);
34
35	if (driver == port->serial->type)
36		return 1;
37
38	return 0;
39}
40
41static int usb_serial_device_probe(struct device *dev)
42{
43	struct usb_serial_driver *driver;
44	struct usb_serial_port *port;
45	struct device *tty_dev;
46	int retval = 0;
47	int minor;
48
49	port = to_usb_serial_port(dev);
50	if (!port)
51		return -ENODEV;
52
53	/* make sure suspend/resume doesn't race against port_probe */
54	retval = usb_autopm_get_interface(port->serial->interface);
55	if (retval)
56		return retval;
57
58	driver = port->serial->type;
59	if (driver->port_probe) {
60		retval = driver->port_probe(port);
61		if (retval)
62			goto err_autopm_put;
63	}
64
65	minor = port->minor;
66	tty_dev = tty_register_device(usb_serial_tty_driver, minor, dev);
67	if (IS_ERR(tty_dev)) {
68		retval = PTR_ERR(tty_dev);
69		goto err_port_remove;
70	}
71
72	usb_autopm_put_interface(port->serial->interface);
73
74	dev_info(&port->serial->dev->dev,
75		 "%s converter now attached to ttyUSB%d\n",
76		 driver->description, minor);
77
78	return 0;
79
80err_port_remove:
81	if (driver->port_remove)
82		driver->port_remove(port);
83err_autopm_put:
84	usb_autopm_put_interface(port->serial->interface);
85
86	return retval;
87}
88
89static int usb_serial_device_remove(struct device *dev)
90{
91	struct usb_serial_driver *driver;
92	struct usb_serial_port *port;
93	int retval = 0;
94	int minor;
95	int autopm_err;
96
97	port = to_usb_serial_port(dev);
98	if (!port)
99		return -ENODEV;
100
101	/*
102	 * Make sure suspend/resume doesn't race against port_remove.
103	 *
104	 * Note that no further runtime PM callbacks will be made if
105	 * autopm_get fails.
106	 */
107	autopm_err = usb_autopm_get_interface(port->serial->interface);
108
109	minor = port->minor;
110	tty_unregister_device(usb_serial_tty_driver, minor);
111
112	driver = port->serial->type;
113	if (driver->port_remove)
114		retval = driver->port_remove(port);
115
116	dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
117		 driver->description, minor);
118
119	if (!autopm_err)
120		usb_autopm_put_interface(port->serial->interface);
121
122	return retval;
123}
124
125static ssize_t new_id_store(struct device_driver *driver,
126			    const char *buf, size_t count)
127{
128	struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
129	ssize_t retval = usb_store_new_id(&usb_drv->dynids, usb_drv->id_table,
130					 driver, buf, count);
131
132	if (retval >= 0 && usb_drv->usb_driver != NULL)
133		retval = usb_store_new_id(&usb_drv->usb_driver->dynids,
134					  usb_drv->usb_driver->id_table,
135					  &usb_drv->usb_driver->drvwrap.driver,
136					  buf, count);
137	return retval;
138}
139
140static ssize_t new_id_show(struct device_driver *driver, char *buf)
141{
142	struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
143
144	return usb_show_dynids(&usb_drv->dynids, buf);
145}
146static DRIVER_ATTR_RW(new_id);
147
148static struct attribute *usb_serial_drv_attrs[] = {
149	&driver_attr_new_id.attr,
150	NULL,
151};
152ATTRIBUTE_GROUPS(usb_serial_drv);
153
154static void free_dynids(struct usb_serial_driver *drv)
155{
156	struct usb_dynid *dynid, *n;
157
158	spin_lock(&drv->dynids.lock);
159	list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
160		list_del(&dynid->node);
161		kfree(dynid);
162	}
163	spin_unlock(&drv->dynids.lock);
164}
165
166struct bus_type usb_serial_bus_type = {
167	.name =		"usb-serial",
168	.match =	usb_serial_device_match,
169	.probe =	usb_serial_device_probe,
170	.remove =	usb_serial_device_remove,
171	.drv_groups = 	usb_serial_drv_groups,
172};
173
174int usb_serial_bus_register(struct usb_serial_driver *driver)
175{
176	int retval;
177
178	driver->driver.bus = &usb_serial_bus_type;
179	spin_lock_init(&driver->dynids.lock);
180	INIT_LIST_HEAD(&driver->dynids.list);
181
182	retval = driver_register(&driver->driver);
183
184	return retval;
185}
186
187void usb_serial_bus_deregister(struct usb_serial_driver *driver)
188{
189	free_dynids(driver);
190	driver_unregister(&driver->driver);
191}
192
193