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