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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 ssize_t show_port_number(struct device *dev,
42 struct device_attribute *attr, char *buf)
43{
44 struct usb_serial_port *port = to_usb_serial_port(dev);
45
46 return sprintf(buf, "%d\n", port->number - port->serial->minor);
47}
48
49static DEVICE_ATTR(port_number, S_IRUGO, show_port_number, NULL);
50
51static int usb_serial_device_probe(struct device *dev)
52{
53 struct usb_serial_driver *driver;
54 struct usb_serial_port *port;
55 int retval = 0;
56 int minor;
57
58 port = to_usb_serial_port(dev);
59 if (!port) {
60 retval = -ENODEV;
61 goto exit;
62 }
63 if (port->dev_state != PORT_REGISTERING)
64 goto exit;
65
66 driver = port->serial->type;
67 if (driver->port_probe) {
68 retval = driver->port_probe(port);
69 if (retval)
70 goto exit;
71 }
72
73 retval = device_create_file(dev, &dev_attr_port_number);
74 if (retval) {
75 if (driver->port_remove)
76 retval = driver->port_remove(port);
77 goto exit;
78 }
79
80 minor = port->number;
81 tty_register_device(usb_serial_tty_driver, minor, dev);
82 dev_info(&port->serial->dev->dev,
83 "%s converter now attached to ttyUSB%d\n",
84 driver->description, minor);
85
86exit:
87 return retval;
88}
89
90static int usb_serial_device_remove(struct device *dev)
91{
92 struct usb_serial_driver *driver;
93 struct usb_serial_port *port;
94 int retval = 0;
95 int minor;
96
97 port = to_usb_serial_port(dev);
98 if (!port)
99 return -ENODEV;
100
101 if (port->dev_state != PORT_UNREGISTERING)
102 return retval;
103
104 device_remove_file(&port->dev, &dev_attr_port_number);
105
106 driver = port->serial->type;
107 if (driver->port_remove)
108 retval = driver->port_remove(port);
109
110 minor = port->number;
111 tty_unregister_device(usb_serial_tty_driver, minor);
112 dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
113 driver->description, minor);
114
115 return retval;
116}
117
118#ifdef CONFIG_HOTPLUG
119static ssize_t store_new_id(struct device_driver *driver,
120 const char *buf, size_t count)
121{
122 struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
123 ssize_t retval = usb_store_new_id(&usb_drv->dynids, driver, buf, count);
124
125 if (retval >= 0 && usb_drv->usb_driver != NULL)
126 retval = usb_store_new_id(&usb_drv->usb_driver->dynids,
127 &usb_drv->usb_driver->drvwrap.driver,
128 buf, count);
129 return retval;
130}
131
132static struct driver_attribute drv_attrs[] = {
133 __ATTR(new_id, S_IWUSR, NULL, store_new_id),
134 __ATTR_NULL,
135};
136
137static void free_dynids(struct usb_serial_driver *drv)
138{
139 struct usb_dynid *dynid, *n;
140
141 spin_lock(&drv->dynids.lock);
142 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
143 list_del(&dynid->node);
144 kfree(dynid);
145 }
146 spin_unlock(&drv->dynids.lock);
147}
148
149#else
150static struct driver_attribute drv_attrs[] = {
151 __ATTR_NULL,
152};
153static inline void free_dynids(struct usb_serial_driver *drv)
154{
155}
156#endif
157
158struct bus_type usb_serial_bus_type = {
159 .name = "usb-serial",
160 .match = usb_serial_device_match,
161 .probe = usb_serial_device_probe,
162 .remove = usb_serial_device_remove,
163 .drv_attrs = drv_attrs,
164};
165
166int usb_serial_bus_register(struct usb_serial_driver *driver)
167{
168 int retval;
169
170 driver->driver.bus = &usb_serial_bus_type;
171 spin_lock_init(&driver->dynids.lock);
172 INIT_LIST_HEAD(&driver->dynids.list);
173
174 retval = driver_register(&driver->driver);
175
176 return retval;
177}
178
179void usb_serial_bus_deregister(struct usb_serial_driver *driver)
180{
181 free_dynids(driver);
182 driver_unregister(&driver->driver);
183}
184
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * USB Serial Converter Bus specific functions
4 *
5 * Copyright (C) 2002 Greg Kroah-Hartman (greg@kroah.com)
6 */
7
8#include <linux/kernel.h>
9#include <linux/errno.h>
10#include <linux/tty.h>
11#include <linux/slab.h>
12#include <linux/module.h>
13#include <linux/usb.h>
14#include <linux/usb/serial.h>
15
16static int usb_serial_device_match(struct device *dev,
17 struct device_driver *drv)
18{
19 struct usb_serial_driver *driver;
20 const struct usb_serial_port *port;
21
22 /*
23 * drivers are already assigned to ports in serial_probe so it's
24 * a simple check here.
25 */
26 port = to_usb_serial_port(dev);
27 if (!port)
28 return 0;
29
30 driver = to_usb_serial_driver(drv);
31
32 if (driver == port->serial->type)
33 return 1;
34
35 return 0;
36}
37
38static int usb_serial_device_probe(struct device *dev)
39{
40 struct usb_serial_driver *driver;
41 struct usb_serial_port *port;
42 struct device *tty_dev;
43 int retval = 0;
44 int minor;
45
46 port = to_usb_serial_port(dev);
47 if (!port)
48 return -ENODEV;
49
50 /* make sure suspend/resume doesn't race against port_probe */
51 retval = usb_autopm_get_interface(port->serial->interface);
52 if (retval)
53 return retval;
54
55 driver = port->serial->type;
56 if (driver->port_probe) {
57 retval = driver->port_probe(port);
58 if (retval)
59 goto err_autopm_put;
60 }
61
62 minor = port->minor;
63 tty_dev = tty_port_register_device(&port->port, usb_serial_tty_driver,
64 minor, dev);
65 if (IS_ERR(tty_dev)) {
66 retval = PTR_ERR(tty_dev);
67 goto err_port_remove;
68 }
69
70 usb_autopm_put_interface(port->serial->interface);
71
72 dev_info(&port->serial->dev->dev,
73 "%s converter now attached to ttyUSB%d\n",
74 driver->description, minor);
75
76 return 0;
77
78err_port_remove:
79 if (driver->port_remove)
80 driver->port_remove(port);
81err_autopm_put:
82 usb_autopm_put_interface(port->serial->interface);
83
84 return retval;
85}
86
87static int usb_serial_device_remove(struct device *dev)
88{
89 struct usb_serial_driver *driver;
90 struct usb_serial_port *port;
91 int retval = 0;
92 int minor;
93 int autopm_err;
94
95 port = to_usb_serial_port(dev);
96 if (!port)
97 return -ENODEV;
98
99 /*
100 * Make sure suspend/resume doesn't race against port_remove.
101 *
102 * Note that no further runtime PM callbacks will be made if
103 * autopm_get fails.
104 */
105 autopm_err = usb_autopm_get_interface(port->serial->interface);
106
107 minor = port->minor;
108 tty_unregister_device(usb_serial_tty_driver, minor);
109
110 driver = port->serial->type;
111 if (driver->port_remove)
112 retval = driver->port_remove(port);
113
114 dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
115 driver->description, minor);
116
117 if (!autopm_err)
118 usb_autopm_put_interface(port->serial->interface);
119
120 return retval;
121}
122
123static ssize_t new_id_store(struct device_driver *driver,
124 const char *buf, size_t count)
125{
126 struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
127 ssize_t retval = usb_store_new_id(&usb_drv->dynids, usb_drv->id_table,
128 driver, buf, count);
129
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->id_table,
133 &usb_drv->usb_driver->drvwrap.driver,
134 buf, count);
135 return retval;
136}
137
138static ssize_t new_id_show(struct device_driver *driver, char *buf)
139{
140 struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
141
142 return usb_show_dynids(&usb_drv->dynids, buf);
143}
144static DRIVER_ATTR_RW(new_id);
145
146static struct attribute *usb_serial_drv_attrs[] = {
147 &driver_attr_new_id.attr,
148 NULL,
149};
150ATTRIBUTE_GROUPS(usb_serial_drv);
151
152static void free_dynids(struct usb_serial_driver *drv)
153{
154 struct usb_dynid *dynid, *n;
155
156 spin_lock(&drv->dynids.lock);
157 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
158 list_del(&dynid->node);
159 kfree(dynid);
160 }
161 spin_unlock(&drv->dynids.lock);
162}
163
164struct bus_type usb_serial_bus_type = {
165 .name = "usb-serial",
166 .match = usb_serial_device_match,
167 .probe = usb_serial_device_probe,
168 .remove = usb_serial_device_remove,
169 .drv_groups = usb_serial_drv_groups,
170};
171
172int usb_serial_bus_register(struct usb_serial_driver *driver)
173{
174 int retval;
175
176 driver->driver.bus = &usb_serial_bus_type;
177 spin_lock_init(&driver->dynids.lock);
178 INIT_LIST_HEAD(&driver->dynids.list);
179
180 retval = driver_register(&driver->driver);
181
182 return retval;
183}
184
185void usb_serial_bus_deregister(struct usb_serial_driver *driver)
186{
187 free_dynids(driver);
188 driver_unregister(&driver->driver);
189}
190