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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/*
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