kernel/drivers/usb/serial/kobil_sct.c

   1 /*
   2  *  KOBIL USB Smart Card Terminal Driver
   3  *
   4  *  Copyright (C) 2002  KOBIL Systems GmbH
   5  *  Author: Thomas Wahrenbruch
   6  *
   7  *  Contact: linuxusb@kobil.de
   8  *
   9  *  This program is largely derived from work by the linux-usb group
  10  *  and associated source files.  Please see the usb/serial files for
  11  *  individual credits and copyrights.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
  19  *  patience.
  20  *
  21  * Supported readers: USB TWIN, KAAN Standard Plus and SecOVID Reader Plus
  22  * (Adapter K), B1 Professional and KAAN Professional (Adapter B)
  23  */
  24
  25
  26 #include <linux/kernel.h>
  27 #include <linux/errno.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include <linux/ioctl.h>
  38 #include "kobil_sct.h"
  39
  40 #define DRIVER_AUTHOR "KOBIL Systems GmbH - http://www.kobil.com"
  41 #define DRIVER_DESC "KOBIL USB Smart Card Terminal Driver (experimental)"
  42
  43 #define KOBIL_VENDOR_ID                 0x0D46
  44 #define KOBIL_ADAPTER_B_PRODUCT_ID      0x2011
  45 #define KOBIL_ADAPTER_K_PRODUCT_ID      0x2012
  46 #define KOBIL_USBTWIN_PRODUCT_ID        0x0078
  47 #define KOBIL_KAAN_SIM_PRODUCT_ID       0x0081
  48
  49 #define KOBIL_TIMEOUT           500
  50 #define KOBIL_BUF_LENGTH        300
  51
  52
  53 /* Function prototypes */
  54 static int kobil_attach(struct usb_serial *serial);
  55 static int kobil_port_probe(struct usb_serial_port *probe);
  56 static int kobil_port_remove(struct usb_serial_port *probe);
  57 static int  kobil_open(struct tty_struct *tty, struct usb_serial_port *port);
  58 static void kobil_close(struct usb_serial_port *port);
  59 static int  kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
  60                          const unsigned char *buf, int count);
  61 static int  kobil_write_room(struct tty_struct *tty);
  62 static int  kobil_ioctl(struct tty_struct *tty,
  63                         unsigned int cmd, unsigned long arg);
  64 static int  kobil_tiocmget(struct tty_struct *tty);
  65 static int  kobil_tiocmset(struct tty_struct *tty,
  66                            unsigned int set, unsigned int clear);
  67 static void kobil_read_int_callback(struct urb *urb);
  68 static void kobil_write_int_callback(struct urb *urb);
  69 static void kobil_set_termios(struct tty_struct *tty,
  70                         struct usb_serial_port *port, struct ktermios *old);
  71 static void kobil_init_termios(struct tty_struct *tty);
  72
  73 static const struct usb_device_id id_table[] = {
  74         { USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_B_PRODUCT_ID) },
  75         { USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_ADAPTER_K_PRODUCT_ID) },
  76         { USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_USBTWIN_PRODUCT_ID) },
  77         { USB_DEVICE(KOBIL_VENDOR_ID, KOBIL_KAAN_SIM_PRODUCT_ID) },
  78         { }                     /* Terminating entry */
  79 };
  80 MODULE_DEVICE_TABLE(usb, id_table);
  81
  82 static struct usb_serial_driver kobil_device = {
  83         .driver = {
  84                 .owner =        THIS_MODULE,
  85                 .name =         "kobil",
  86         },
  87         .description =          "KOBIL USB smart card terminal",
  88         .id_table =             id_table,
  89         .num_ports =            1,
  90         .attach =               kobil_attach,
  91         .port_probe =           kobil_port_probe,
  92         .port_remove =          kobil_port_remove,
  93         .ioctl =                kobil_ioctl,
  94         .set_termios =          kobil_set_termios,
  95         .init_termios =         kobil_init_termios,
  96         .tiocmget =             kobil_tiocmget,
  97         .tiocmset =             kobil_tiocmset,
  98         .open =                 kobil_open,
  99         .close =                kobil_close,
 100         .write =                kobil_write,
 101         .write_room =           kobil_write_room,
 102         .read_int_callback =    kobil_read_int_callback,
 103         .write_int_callback =   kobil_write_int_callback,
 104 };
 105
 106 static struct usb_serial_driver * const serial_drivers[] = {
 107         &kobil_device, NULL
 108 };
 109
 110 struct kobil_private {
 111         unsigned char buf[KOBIL_BUF_LENGTH]; /* buffer for the APDU to send */
 112         int filled;  /* index of the last char in buf */
 113         int cur_pos; /* index of the next char to send in buf */
 114         __u16 device_type;
 115 };
 116
 117
 118 static int kobil_attach(struct usb_serial *serial)
 119 {
 120         if (serial->num_interrupt_out < serial->num_ports) {
 121                 dev_err(&serial->interface->dev, "missing interrupt-out endpoint\n");
 122                 return -ENODEV;
 123         }
 124
 125         return 0;
 126 }
 127
 128 static int kobil_port_probe(struct usb_serial_port *port)
 129 {
 130         struct usb_serial *serial = port->serial;
 131         struct kobil_private *priv;
 132
 133         priv = kmalloc(sizeof(struct kobil_private), GFP_KERNEL);
 134         if (!priv)
 135                 return -ENOMEM;
 136
 137         priv->filled = 0;
 138         priv->cur_pos = 0;
 139         priv->device_type = le16_to_cpu(serial->dev->descriptor.idProduct);
 140
 141         switch (priv->device_type) {
 142         case KOBIL_ADAPTER_B_PRODUCT_ID:
 143                 dev_dbg(&serial->dev->dev, "KOBIL B1 PRO / KAAN PRO detected\n");
 144                 break;
 145         case KOBIL_ADAPTER_K_PRODUCT_ID:
 146                 dev_dbg(&serial->dev->dev, "KOBIL KAAN Standard Plus / SecOVID Reader Plus detected\n");
 147                 break;
 148         case KOBIL_USBTWIN_PRODUCT_ID:
 149                 dev_dbg(&serial->dev->dev, "KOBIL USBTWIN detected\n");
 150                 break;
 151         case KOBIL_KAAN_SIM_PRODUCT_ID:
 152                 dev_dbg(&serial->dev->dev, "KOBIL KAAN SIM detected\n");
 153                 break;
 154         }
 155         usb_set_serial_port_data(port, priv);
 156
 157         return 0;
 158 }
 159
 160
 161 static int kobil_port_remove(struct usb_serial_port *port)
 162 {
 163         struct kobil_private *priv;
 164
 165         priv = usb_get_serial_port_data(port);
 166         kfree(priv);
 167
 168         return 0;
 169 }
 170
 171 static void kobil_init_termios(struct tty_struct *tty)
 172 {
 173         /* Default to echo off and other sane device settings */
 174         tty->termios.c_lflag = 0;
 175         tty->termios.c_iflag &= ~(ISIG | ICANON | ECHO | IEXTEN | XCASE);
 176         tty->termios.c_iflag |= IGNBRK | IGNPAR | IXOFF;
 177         /* do NOT translate CR to CR-NL (0x0A -> 0x0A 0x0D) */
 178         tty->termios.c_oflag &= ~ONLCR;
 179 }
 180
 181 static int kobil_open(struct tty_struct *tty, struct usb_serial_port *port)
 182 {
 183         struct device *dev = &port->dev;
 184         int result = 0;
 185         struct kobil_private *priv;
 186         unsigned char *transfer_buffer;
 187         int transfer_buffer_length = 8;
 188
 189         priv = usb_get_serial_port_data(port);
 190
 191         /* allocate memory for transfer buffer */
 192         transfer_buffer = kzalloc(transfer_buffer_length, GFP_KERNEL);
 193         if (!transfer_buffer)
 194                 return -ENOMEM;
 195
 196         /* get hardware version */
 197         result = usb_control_msg(port->serial->dev,
 198                           usb_rcvctrlpipe(port->serial->dev, 0),
 199                           SUSBCRequest_GetMisc,
 200                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
 201                           SUSBCR_MSC_GetHWVersion,
 202                           0,
 203                           transfer_buffer,
 204                           transfer_buffer_length,
 205                           KOBIL_TIMEOUT
 206         );
 207         dev_dbg(dev, "%s - Send get_HW_version URB returns: %i\n", __func__, result);
 208         dev_dbg(dev, "Hardware version: %i.%i.%i\n", transfer_buffer[0],
 209                 transfer_buffer[1], transfer_buffer[2]);
 210
 211         /* get firmware version */
 212         result = usb_control_msg(port->serial->dev,
 213                           usb_rcvctrlpipe(port->serial->dev, 0),
 214                           SUSBCRequest_GetMisc,
 215                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
 216                           SUSBCR_MSC_GetFWVersion,
 217                           0,
 218                           transfer_buffer,
 219                           transfer_buffer_length,
 220                           KOBIL_TIMEOUT
 221         );
 222         dev_dbg(dev, "%s - Send get_FW_version URB returns: %i\n", __func__, result);
 223         dev_dbg(dev, "Firmware version: %i.%i.%i\n", transfer_buffer[0],
 224                 transfer_buffer[1], transfer_buffer[2]);
 225
 226         if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
 227                         priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) {
 228                 /* Setting Baudrate, Parity and Stopbits */
 229                 result = usb_control_msg(port->serial->dev,
 230                           usb_sndctrlpipe(port->serial->dev, 0),
 231                           SUSBCRequest_SetBaudRateParityAndStopBits,
 232                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 233                           SUSBCR_SBR_9600 | SUSBCR_SPASB_EvenParity |
 234                                                         SUSBCR_SPASB_1StopBit,
 235                           0,
 236                           NULL,
 237                           0,
 238                           KOBIL_TIMEOUT
 239                 );
 240                 dev_dbg(dev, "%s - Send set_baudrate URB returns: %i\n", __func__, result);
 241
 242                 /* reset all queues */
 243                 result = usb_control_msg(port->serial->dev,
 244                           usb_sndctrlpipe(port->serial->dev, 0),
 245                           SUSBCRequest_Misc,
 246                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 247                           SUSBCR_MSC_ResetAllQueues,
 248                           0,
 249                           NULL,
 250                           0,
 251                           KOBIL_TIMEOUT
 252                 );
 253                 dev_dbg(dev, "%s - Send reset_all_queues URB returns: %i\n", __func__, result);
 254         }
 255         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID ||
 256             priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
 257             priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
 258                 /* start reading (Adapter B 'cause PNP string) */
 259                 result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 260                 dev_dbg(dev, "%s - Send read URB returns: %i\n", __func__, result);
 261         }
 262
 263         kfree(transfer_buffer);
 264         return 0;
 265 }
 266
 267
 268 static void kobil_close(struct usb_serial_port *port)
 269 {
 270         /* FIXME: Add rts/dtr methods */
 271         usb_kill_urb(port->interrupt_out_urb);
 272         usb_kill_urb(port->interrupt_in_urb);
 273 }
 274
 275
 276 static void kobil_read_int_callback(struct urb *urb)
 277 {
 278         int result;
 279         struct usb_serial_port *port = urb->context;
 280         unsigned char *data = urb->transfer_buffer;
 281         int status = urb->status;
 282
 283         if (status) {
 284                 dev_dbg(&port->dev, "%s - Read int status not zero: %d\n", __func__, status);
 285                 return;
 286         }
 287
 288         if (urb->actual_length) {
 289                 usb_serial_debug_data(&port->dev, __func__, urb->actual_length,
 290                                                                         data);
 291                 tty_insert_flip_string(&port->port, data, urb->actual_length);
 292                 tty_flip_buffer_push(&port->port);
 293         }
 294
 295         result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
 296         dev_dbg(&port->dev, "%s - Send read URB returns: %i\n", __func__, result);
 297 }
 298
 299
 300 static void kobil_write_int_callback(struct urb *urb)
 301 {
 302 }
 303
 304
 305 static int kobil_write(struct tty_struct *tty, struct usb_serial_port *port,
 306                         const unsigned char *buf, int count)
 307 {
 308         int length = 0;
 309         int result = 0;
 310         int todo = 0;
 311         struct kobil_private *priv;
 312
 313         if (count == 0) {
 314                 dev_dbg(&port->dev, "%s - write request of 0 bytes\n", __func__);
 315                 return 0;
 316         }
 317
 318         priv = usb_get_serial_port_data(port);
 319
 320         if (count > (KOBIL_BUF_LENGTH - priv->filled)) {
 321                 dev_dbg(&port->dev, "%s - Error: write request bigger than buffer size\n", __func__);
 322                 return -ENOMEM;
 323         }
 324
 325         /* Copy data to buffer */
 326         memcpy(priv->buf + priv->filled, buf, count);
 327         usb_serial_debug_data(&port->dev, __func__, count, priv->buf + priv->filled);
 328         priv->filled = priv->filled + count;
 329
 330         /* only send complete block. TWIN, KAAN SIM and adapter K
 331            use the same protocol. */
 332         if (((priv->device_type != KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 2) && (priv->filled >= (priv->buf[1] + 3))) ||
 333              ((priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) && (priv->filled > 3) && (priv->filled >= (priv->buf[2] + 4)))) {
 334                 /* stop reading (except TWIN and KAAN SIM) */
 335                 if ((priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID)
 336                         || (priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID))
 337                         usb_kill_urb(port->interrupt_in_urb);
 338
 339                 todo = priv->filled - priv->cur_pos;
 340
 341                 while (todo > 0) {
 342                         /* max 8 byte in one urb (endpoint size) */
 343                         length = min(todo, port->interrupt_out_size);
 344                         /* copy data to transfer buffer */
 345                         memcpy(port->interrupt_out_buffer,
 346                                         priv->buf + priv->cur_pos, length);
 347                         port->interrupt_out_urb->transfer_buffer_length = length;
 348
 349                         priv->cur_pos = priv->cur_pos + length;
 350                         result = usb_submit_urb(port->interrupt_out_urb,
 351                                         GFP_ATOMIC);
 352                         dev_dbg(&port->dev, "%s - Send write URB returns: %i\n", __func__, result);
 353                         todo = priv->filled - priv->cur_pos;
 354
 355                         if (todo > 0)
 356                                 msleep(24);
 357                 }
 358
 359                 priv->filled = 0;
 360                 priv->cur_pos = 0;
 361
 362                 /* start reading (except TWIN and KAAN SIM) */
 363                 if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID ||
 364                         priv->device_type == KOBIL_ADAPTER_K_PRODUCT_ID) {
 365                         result = usb_submit_urb(port->interrupt_in_urb,
 366                                         GFP_ATOMIC);
 367                         dev_dbg(&port->dev, "%s - Send read URB returns: %i\n", __func__, result);
 368                 }
 369         }
 370         return count;
 371 }
 372
 373
 374 static int kobil_write_room(struct tty_struct *tty)
 375 {
 376         /* FIXME */
 377         return 8;
 378 }
 379
 380
 381 static int kobil_tiocmget(struct tty_struct *tty)
 382 {
 383         struct usb_serial_port *port = tty->driver_data;
 384         struct kobil_private *priv;
 385         int result;
 386         unsigned char *transfer_buffer;
 387         int transfer_buffer_length = 8;
 388
 389         priv = usb_get_serial_port_data(port);
 390         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID
 391                         || priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
 392                 /* This device doesn't support ioctl calls */
 393                 return -EINVAL;
 394         }
 395
 396         /* allocate memory for transfer buffer */
 397         transfer_buffer = kzalloc(transfer_buffer_length, GFP_KERNEL);
 398         if (!transfer_buffer)
 399                 return -ENOMEM;
 400
 401         result = usb_control_msg(port->serial->dev,
 402                           usb_rcvctrlpipe(port->serial->dev, 0),
 403                           SUSBCRequest_GetStatusLineState,
 404                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_IN,
 405                           0,
 406                           0,
 407                           transfer_buffer,
 408                           transfer_buffer_length,
 409                           KOBIL_TIMEOUT);
 410
 411         dev_dbg(&port->dev, "%s - Send get_status_line_state URB returns: %i. Statusline: %02x\n",
 412                 __func__, result, transfer_buffer[0]);
 413
 414         result = 0;
 415         if ((transfer_buffer[0] & SUSBCR_GSL_DSR) != 0)
 416                 result = TIOCM_DSR;
 417         kfree(transfer_buffer);
 418         return result;
 419 }
 420
 421 static int kobil_tiocmset(struct tty_struct *tty,
 422                            unsigned int set, unsigned int clear)
 423 {
 424         struct usb_serial_port *port = tty->driver_data;
 425         struct device *dev = &port->dev;
 426         struct kobil_private *priv;
 427         int result;
 428         int dtr = 0;
 429         int rts = 0;
 430
 431         /* FIXME: locking ? */
 432         priv = usb_get_serial_port_data(port);
 433         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID
 434                 || priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
 435                 /* This device doesn't support ioctl calls */
 436                 return -EINVAL;
 437         }
 438
 439         if (set & TIOCM_RTS)
 440                 rts = 1;
 441         if (set & TIOCM_DTR)
 442                 dtr = 1;
 443         if (clear & TIOCM_RTS)
 444                 rts = 0;
 445         if (clear & TIOCM_DTR)
 446                 dtr = 0;
 447
 448         if (priv->device_type == KOBIL_ADAPTER_B_PRODUCT_ID) {
 449                 if (dtr != 0)
 450                         dev_dbg(dev, "%s - Setting DTR\n", __func__);
 451                 else
 452                         dev_dbg(dev, "%s - Clearing DTR\n", __func__);
 453                 result = usb_control_msg(port->serial->dev,
 454                           usb_sndctrlpipe(port->serial->dev, 0),
 455                           SUSBCRequest_SetStatusLinesOrQueues,
 456                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 457                           ((dtr != 0) ? SUSBCR_SSL_SETDTR : SUSBCR_SSL_CLRDTR),
 458                           0,
 459                           NULL,
 460                           0,
 461                           KOBIL_TIMEOUT);
 462         } else {
 463                 if (rts != 0)
 464                         dev_dbg(dev, "%s - Setting RTS\n", __func__);
 465                 else
 466                         dev_dbg(dev, "%s - Clearing RTS\n", __func__);
 467                 result = usb_control_msg(port->serial->dev,
 468                         usb_sndctrlpipe(port->serial->dev, 0),
 469                         SUSBCRequest_SetStatusLinesOrQueues,
 470                         USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 471                         ((rts != 0) ? SUSBCR_SSL_SETRTS : SUSBCR_SSL_CLRRTS),
 472                         0,
 473                         NULL,
 474                         0,
 475                         KOBIL_TIMEOUT);
 476         }
 477         dev_dbg(dev, "%s - Send set_status_line URB returns: %i\n", __func__, result);
 478         return (result < 0) ? result : 0;
 479 }
 480
 481 static void kobil_set_termios(struct tty_struct *tty,
 482                         struct usb_serial_port *port, struct ktermios *old)
 483 {
 484         struct kobil_private *priv;
 485         int result;
 486         unsigned short urb_val = 0;
 487         int c_cflag = tty->termios.c_cflag;
 488         speed_t speed;
 489
 490         priv = usb_get_serial_port_data(port);
 491         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID ||
 492                         priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID) {
 493                 /* This device doesn't support ioctl calls */
 494                 tty_termios_copy_hw(&tty->termios, old);
 495                 return;
 496         }
 497
 498         speed = tty_get_baud_rate(tty);
 499         switch (speed) {
 500         case 1200:
 501                 urb_val = SUSBCR_SBR_1200;
 502                 break;
 503         default:
 504                 speed = 9600;
 505         case 9600:
 506                 urb_val = SUSBCR_SBR_9600;
 507                 break;
 508         }
 509         urb_val |= (c_cflag & CSTOPB) ? SUSBCR_SPASB_2StopBits :
 510                                                         SUSBCR_SPASB_1StopBit;
 511         if (c_cflag & PARENB) {
 512                 if  (c_cflag & PARODD)
 513                         urb_val |= SUSBCR_SPASB_OddParity;
 514                 else
 515                         urb_val |= SUSBCR_SPASB_EvenParity;
 516         } else
 517                 urb_val |= SUSBCR_SPASB_NoParity;
 518         tty->termios.c_cflag &= ~CMSPAR;
 519         tty_encode_baud_rate(tty, speed, speed);
 520
 521         result = usb_control_msg(port->serial->dev,
 522                   usb_sndctrlpipe(port->serial->dev, 0),
 523                   SUSBCRequest_SetBaudRateParityAndStopBits,
 524                   USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 525                   urb_val,
 526                   0,
 527                   NULL,
 528                   0,
 529                   KOBIL_TIMEOUT
 530                 );
 531 }
 532
 533 static int kobil_ioctl(struct tty_struct *tty,
 534                                         unsigned int cmd, unsigned long arg)
 535 {
 536         struct usb_serial_port *port = tty->driver_data;
 537         struct kobil_private *priv = usb_get_serial_port_data(port);
 538         int result;
 539
 540         if (priv->device_type == KOBIL_USBTWIN_PRODUCT_ID ||
 541                         priv->device_type == KOBIL_KAAN_SIM_PRODUCT_ID)
 542                 /* This device doesn't support ioctl calls */
 543                 return -ENOIOCTLCMD;
 544
 545         switch (cmd) {
 546         case TCFLSH:
 547                 result = usb_control_msg(port->serial->dev,
 548                           usb_sndctrlpipe(port->serial->dev, 0),
 549                           SUSBCRequest_Misc,
 550                           USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT,
 551                           SUSBCR_MSC_ResetAllQueues,
 552                           0,
 553                           NULL,
 554                           0,
 555                           KOBIL_TIMEOUT
 556                         );
 557
 558                 dev_dbg(&port->dev,
 559                         "%s - Send reset_all_queues (FLUSH) URB returns: %i\n",
 560                         __func__, result);
 561                 return (result < 0) ? -EIO: 0;
 562         default:
 563                 return -ENOIOCTLCMD;
 564         }
 565 }
 566
 567 module_usb_serial_driver(serial_drivers, id_table);
 568
 569 MODULE_AUTHOR(DRIVER_AUTHOR);
 570 MODULE_DESCRIPTION(DRIVER_DESC);
 571 MODULE_LICENSE("GPL");