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 19 static 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 41 static 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 80 err_port_remove: 81 if (driver->port_remove) 82 driver->port_remove(port); 83 err_autopm_put: 84 usb_autopm_put_interface(port->serial->interface); 85 86 return retval; 87 } 88 89 static 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 } 124 125 static 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 } 139 140 static 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 } 146 static DRIVER_ATTR_RW(new_id); 147 148 static struct attribute *usb_serial_drv_attrs[] = { 149 &driver_attr_new_id.attr, 150 NULL, 151 }; 152 ATTRIBUTE_GROUPS(usb_serial_drv); 153 154 static 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 } 165 166 struct 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 }; 173 174 int 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 } 186 187 void usb_serial_bus_deregister(struct usb_serial_driver *driver) 188 { 189 free_dynids(driver); 190 driver_unregister(&driver->driver); 191 } 192 193