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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
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 port_number_show(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->port_number);
47}
48static DEVICE_ATTR_RO(port_number);
49
50static int usb_serial_device_probe(struct device *dev)
51{
52 struct usb_serial_driver *driver;
53 struct usb_serial_port *port;
54 int retval = 0;
55 int minor;
56
57 port = to_usb_serial_port(dev);
58 if (!port) {
59 retval = -ENODEV;
60 goto exit;
61 }
62
63 /* make sure suspend/resume doesn't race against port_probe */
64 retval = usb_autopm_get_interface(port->serial->interface);
65 if (retval)
66 goto exit;
67
68 driver = port->serial->type;
69 if (driver->port_probe) {
70 retval = driver->port_probe(port);
71 if (retval)
72 goto exit_with_autopm;
73 }
74
75 retval = device_create_file(dev, &dev_attr_port_number);
76 if (retval) {
77 if (driver->port_remove)
78 retval = driver->port_remove(port);
79 goto exit_with_autopm;
80 }
81
82 minor = port->minor;
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);
87
88exit_with_autopm:
89 usb_autopm_put_interface(port->serial->interface);
90exit:
91 return retval;
92}
93
94static int usb_serial_device_remove(struct device *dev)
95{
96 struct usb_serial_driver *driver;
97 struct usb_serial_port *port;
98 int retval = 0;
99 int minor;
100
101 port = to_usb_serial_port(dev);
102 if (!port)
103 return -ENODEV;
104
105 /* make sure suspend/resume doesn't race against port_remove */
106 usb_autopm_get_interface(port->serial->interface);
107
108 minor = port->minor;
109 tty_unregister_device(usb_serial_tty_driver, minor);
110
111 device_remove_file(&port->dev, &dev_attr_port_number);
112
113 driver = port->serial->type;
114 if (driver->port_remove)
115 retval = driver->port_remove(port);
116
117 dev_info(dev, "%s converter now disconnected from ttyUSB%d\n",
118 driver->description, minor);
119
120 usb_autopm_put_interface(port->serial->interface);
121 return retval;
122}
123
124static ssize_t new_id_store(struct device_driver *driver,
125 const char *buf, size_t count)
126{
127 struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
128 ssize_t retval = usb_store_new_id(&usb_drv->dynids, usb_drv->id_table,
129 driver, buf, count);
130
131 if (retval >= 0 && usb_drv->usb_driver != NULL)
132 retval = usb_store_new_id(&usb_drv->usb_driver->dynids,
133 usb_drv->usb_driver->id_table,
134 &usb_drv->usb_driver->drvwrap.driver,
135 buf, count);
136 return retval;
137}
138
139static ssize_t new_id_show(struct device_driver *driver, char *buf)
140{
141 struct usb_serial_driver *usb_drv = to_usb_serial_driver(driver);
142
143 return usb_show_dynids(&usb_drv->dynids, buf);
144}
145static DRIVER_ATTR_RW(new_id);
146
147static struct attribute *usb_serial_drv_attrs[] = {
148 &driver_attr_new_id.attr,
149 NULL,
150};
151ATTRIBUTE_GROUPS(usb_serial_drv);
152
153static void free_dynids(struct usb_serial_driver *drv)
154{
155 struct usb_dynid *dynid, *n;
156
157 spin_lock(&drv->dynids.lock);
158 list_for_each_entry_safe(dynid, n, &drv->dynids.list, node) {
159 list_del(&dynid->node);
160 kfree(dynid);
161 }
162 spin_unlock(&drv->dynids.lock);
163}
164
165struct bus_type usb_serial_bus_type = {
166 .name = "usb-serial",
167 .match = usb_serial_device_match,
168 .probe = usb_serial_device_probe,
169 .remove = usb_serial_device_remove,
170 .drv_groups = usb_serial_drv_groups,
171};
172
173int usb_serial_bus_register(struct usb_serial_driver *driver)
174{
175 int retval;
176
177 driver->driver.bus = &usb_serial_bus_type;
178 spin_lock_init(&driver->dynids.lock);
179 INIT_LIST_HEAD(&driver->dynids.list);
180
181 retval = driver_register(&driver->driver);
182
183 return retval;
184}
185
186void usb_serial_bus_deregister(struct usb_serial_driver *driver)
187{
188 free_dynids(driver);
189 driver_unregister(&driver->driver);
190}
191