drivers/usb/serial/ssu100.c

   1 /*
   2  * usb-serial driver for Quatech SSU-100
   3  *
   4  * based on ftdi_sio.c and the original serqt_usb.c from Quatech
   5  *
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/init.h>
  10 #include <linux/slab.h>
  11 #include <linux/tty.h>
  12 #include <linux/tty_driver.h>
  13 #include <linux/tty_flip.h>
  14 #include <linux/module.h>
  15 #include <linux/serial.h>
  16 #include <linux/usb.h>
  17 #include <linux/usb/serial.h>
  18 #include <linux/serial_reg.h>
  19 #include <linux/uaccess.h>
  20
  21 #define QT_OPEN_CLOSE_CHANNEL       0xca
  22 #define QT_SET_GET_DEVICE           0xc2
  23 #define QT_SET_GET_REGISTER         0xc0
  24 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  25 #define QT_SET_ATF                  0xcd
  26 #define QT_GET_SET_UART             0xc1
  27 #define QT_TRANSFER_IN              0xc0
  28 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  29 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  30
  31 #define  SERIAL_MSR_MASK            0xf0
  32
  33 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
  34
  35 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
  36
  37 #define  MAX_BAUD_RATE              460800
  38
  39 #define ATC_DISABLED                0x00
  40 #define DUPMODE_BITS        0xc0
  41 #define RR_BITS             0x03
  42 #define LOOPMODE_BITS       0x41
  43 #define RS232_MODE          0x00
  44 #define RTSCTS_TO_CONNECTOR 0x40
  45 #define CLKS_X4             0x02
  46 #define FULLPWRBIT          0x00000080
  47 #define NEXT_BOARD_POWER_BIT        0x00000004
  48
  49 static int debug = 1;
  50
  51 /* Version Information */
  52 #define DRIVER_VERSION "v0.1"
  53 #define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"
  54
  55 #define USB_VENDOR_ID_QUATECH   0x061d  /* Quatech VID */
  56 #define QUATECH_SSU100  0xC020  /* SSU100 */
  57
  58 static const struct usb_device_id id_table[] = {
  59         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
  60         {}                      /* Terminating entry */
  61 };
  62
  63 MODULE_DEVICE_TABLE(usb, id_table);
  64
  65
  66 static struct usb_driver ssu100_driver = {
  67         .name                          = "ssu100",
  68         .probe                         = usb_serial_probe,
  69         .disconnect                    = usb_serial_disconnect,
  70         .id_table                      = id_table,
  71         .suspend                       = usb_serial_suspend,
  72         .resume                        = usb_serial_resume,
  73         .no_dynamic_id                 = 1,
  74         .supports_autosuspend          = 1,
  75 };
  76
  77 struct ssu100_port_private {
  78         spinlock_t status_lock;
  79         u8 shadowLSR;
  80         u8 shadowMSR;
  81         wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
  82         unsigned short max_packet_size;
  83 };
  84
  85 static void ssu100_release(struct usb_serial *serial)
  86 {
  87         struct ssu100_port_private *priv = usb_get_serial_port_data(*serial->port);
  88
  89         dbg("%s", __func__);
  90         kfree(priv);
  91 }
  92
  93 static inline int ssu100_control_msg(struct usb_device *dev,
  94                                      u8 request, u16 data, u16 index)
  95 {
  96         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  97                                request, 0x40, data, index,
  98                                NULL, 0, 300);
  99 }
 100
 101 static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
 102 {
 103         u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));
 104
 105         return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
 106 }
 107
 108
 109 static inline int ssu100_getdevice(struct usb_device *dev, u8 *data)
 110 {
 111         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 112                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
 113                                data, 3, 300);
 114 }
 115
 116 static inline int ssu100_getregister(struct usb_device *dev,
 117                                      unsigned short uart,
 118                                      unsigned short reg,
 119                                      u8 *data)
 120 {
 121         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 122                                QT_SET_GET_REGISTER, 0xc0, reg,
 123                                uart, data, sizeof(*data), 300);
 124
 125 }
 126
 127
 128 static inline int ssu100_setregister(struct usb_device *dev,
 129                                      unsigned short uart,
 130                                      unsigned short reg,
 131                                      u16 data)
 132 {
 133         u16 value = (data << 8) | reg;
 134
 135         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 136                                QT_SET_GET_REGISTER, 0x40, value, uart,
 137                                NULL, 0, 300);
 138
 139 }
 140
 141 #define set_mctrl(dev, set)             update_mctrl((dev), (set), 0)
 142 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
 143
 144 /* these do not deal with device that have more than 1 port */
 145 static inline int update_mctrl(struct usb_device *dev, unsigned int set,
 146                                unsigned int clear)
 147 {
 148         unsigned urb_value;
 149         int result;
 150
 151         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 152                 dbg("%s - DTR|RTS not being set|cleared", __func__);
 153                 return 0;       /* no change */
 154         }
 155
 156         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 157         urb_value = 0;
 158         if (set & TIOCM_DTR)
 159                 urb_value |= UART_MCR_DTR;
 160         if (set & TIOCM_RTS)
 161                 urb_value |= UART_MCR_RTS;
 162
 163         result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
 164         if (result < 0)
 165                 dbg("%s Error from MODEM_CTRL urb", __func__);
 166
 167         return result;
 168 }
 169
 170 static int ssu100_initdevice(struct usb_device *dev)
 171 {
 172         u8 *data;
 173         int result = 0;
 174
 175         dbg("%s", __func__);
 176
 177         data = kzalloc(3, GFP_KERNEL);
 178         if (!data)
 179                 return -ENOMEM;
 180
 181         result = ssu100_getdevice(dev, data);
 182         if (result < 0) {
 183                 dbg("%s - get_device failed %i", __func__, result);
 184                 goto out;
 185         }
 186
 187         data[1] &= ~FULLPWRBIT;
 188
 189         result = ssu100_setdevice(dev, data);
 190         if (result < 0) {
 191                 dbg("%s - setdevice failed %i", __func__, result);
 192                 goto out;
 193         }
 194
 195         result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
 196         if (result < 0) {
 197                 dbg("%s - set prebuffer level failed %i", __func__, result);
 198                 goto out;
 199         }
 200
 201         result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
 202         if (result < 0) {
 203                 dbg("%s - set ATFprebuffer level failed %i", __func__, result);
 204                 goto out;
 205         }
 206
 207         result = ssu100_getdevice(dev, data);
 208         if (result < 0) {
 209                 dbg("%s - get_device failed %i", __func__, result);
 210                 goto out;
 211         }
 212
 213         data[0] &= ~(RR_BITS | DUPMODE_BITS);
 214         data[0] |= CLKS_X4;
 215         data[1] &= ~(LOOPMODE_BITS);
 216         data[1] |= RS232_MODE;
 217
 218         result = ssu100_setdevice(dev, data);
 219         if (result < 0) {
 220                 dbg("%s - setdevice failed %i", __func__, result);
 221                 goto out;
 222         }
 223
 224 out:    kfree(data);
 225         return result;
 226
 227 }
 228
 229
 230 static void ssu100_set_termios(struct tty_struct *tty,
 231                                struct usb_serial_port *port,
 232                                struct ktermios *old_termios)
 233 {
 234         struct usb_device *dev = port->serial->dev;
 235         struct ktermios *termios = tty->termios;
 236         u16 baud, divisor, remainder;
 237         unsigned int cflag = termios->c_cflag;
 238         u16 urb_value = 0; /* will hold the new flags */
 239         int result;
 240
 241         dbg("%s", __func__);
 242
 243         if (cflag & PARENB) {
 244                 if (cflag & PARODD)
 245                         urb_value |= UART_LCR_PARITY;
 246                 else
 247                         urb_value |= SERIAL_EVEN_PARITY;
 248         }
 249
 250         switch (cflag & CSIZE) {
 251         case CS5:
 252                 urb_value |= UART_LCR_WLEN5;
 253                 break;
 254         case CS6:
 255                 urb_value |= UART_LCR_WLEN6;
 256                 break;
 257         case CS7:
 258                 urb_value |= UART_LCR_WLEN7;
 259                 break;
 260         default:
 261         case CS8:
 262                 urb_value |= UART_LCR_WLEN8;
 263                 break;
 264         }
 265
 266         baud = tty_get_baud_rate(tty);
 267         if (!baud)
 268                 baud = 9600;
 269
 270         dbg("%s - got baud = %d\n", __func__, baud);
 271
 272
 273         divisor = MAX_BAUD_RATE / baud;
 274         remainder = MAX_BAUD_RATE % baud;
 275         if (((remainder * 2) >= baud) && (baud != 110))
 276                 divisor++;
 277
 278         urb_value = urb_value << 8;
 279
 280         result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
 281         if (result < 0)
 282                 dbg("%s - set uart failed", __func__);
 283
 284         if (cflag & CRTSCTS)
 285                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 286                                             SERIAL_CRTSCTS, 0);
 287         else
 288                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 289                                             0, 0);
 290         if (result < 0)
 291                 dbg("%s - set HW flow control failed", __func__);
 292
 293         if (I_IXOFF(tty) || I_IXON(tty)) {
 294                 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));
 295
 296                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 297                                             x, 0);
 298         } else
 299                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 300                                             0, 0);
 301
 302         if (result < 0)
 303                 dbg("%s - set SW flow control failed", __func__);
 304
 305 }
 306
 307
 308 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
 309 {
 310         struct usb_device *dev = port->serial->dev;
 311         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 312         u8 *data;
 313         int result;
 314         unsigned long flags;
 315
 316         dbg("%s - port %d", __func__, port->number);
 317
 318         data = kzalloc(2, GFP_KERNEL);
 319         if (!data)
 320                 return -ENOMEM;
 321
 322         result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 323                                  QT_OPEN_CLOSE_CHANNEL,
 324                                  QT_TRANSFER_IN, 0x01,
 325                                  0, data, 2, 300);
 326         if (result < 0) {
 327                 dbg("%s - open failed %i", __func__, result);
 328                 kfree(data);
 329                 return result;
 330         }
 331
 332         spin_lock_irqsave(&priv->status_lock, flags);
 333         priv->shadowLSR = data[0]  & (UART_LSR_OE | UART_LSR_PE |
 334                                       UART_LSR_FE | UART_LSR_BI);
 335
 336         priv->shadowMSR = data[1]  & (UART_MSR_CTS | UART_MSR_DSR |
 337                                       UART_MSR_RI | UART_MSR_DCD);
 338         spin_unlock_irqrestore(&priv->status_lock, flags);
 339
 340         kfree(data);
 341
 342 /* set to 9600 */
 343         result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
 344         if (result < 0)
 345                 dbg("%s - set uart failed", __func__);
 346
 347         if (tty)
 348                 ssu100_set_termios(tty, port, tty->termios);
 349
 350         return usb_serial_generic_open(tty, port);
 351 }
 352
 353 static void ssu100_close(struct usb_serial_port *port)
 354 {
 355         dbg("%s", __func__);
 356         usb_serial_generic_close(port);
 357 }
 358
 359 static int get_serial_info(struct usb_serial_port *port,
 360                            struct serial_struct __user *retinfo)
 361 {
 362         struct serial_struct tmp;
 363
 364         if (!retinfo)
 365                 return -EFAULT;
 366
 367         memset(&tmp, 0, sizeof(tmp));
 368         tmp.line                = port->serial->minor;
 369         tmp.port                = 0;
 370         tmp.irq                 = 0;
 371         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 372         tmp.xmit_fifo_size      = port->bulk_out_size;
 373         tmp.baud_base           = 9600;
 374         tmp.close_delay         = 5*HZ;
 375         tmp.closing_wait        = 30*HZ;
 376
 377         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 378                 return -EFAULT;
 379         return 0;
 380 }
 381
 382 static int ssu100_ioctl(struct tty_struct *tty, struct file *file,
 383                     unsigned int cmd, unsigned long arg)
 384 {
 385         struct usb_serial_port *port = tty->driver_data;
 386         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 387
 388         dbg("%s cmd 0x%04x", __func__, cmd);
 389
 390         switch (cmd) {
 391         case TIOCGSERIAL:
 392                 return get_serial_info(port,
 393                                        (struct serial_struct __user *) arg);
 394
 395         case TIOCMIWAIT:
 396                 while (priv != NULL) {
 397                         u8 prevMSR = priv->shadowMSR & SERIAL_MSR_MASK;
 398                         interruptible_sleep_on(&priv->delta_msr_wait);
 399                         /* see if a signal did it */
 400                         if (signal_pending(current))
 401                                 return -ERESTARTSYS;
 402                         else {
 403                                 u8 diff = (priv->shadowMSR & SERIAL_MSR_MASK) ^ prevMSR;
 404                                 if (!diff)
 405                                         return -EIO; /* no change => error */
 406
 407                                 /* Return 0 if caller wanted to know about
 408                                    these bits */
 409
 410                                 if (((arg & TIOCM_RNG) && (diff & UART_MSR_RI)) ||
 411                                     ((arg & TIOCM_DSR) && (diff & UART_MSR_DSR)) ||
 412                                     ((arg & TIOCM_CD) && (diff & UART_MSR_DCD)) ||
 413                                     ((arg & TIOCM_CTS) && (diff & UART_MSR_CTS)))
 414                                         return 0;
 415                         }
 416                 }
 417                 return 0;
 418
 419         default:
 420                 break;
 421         }
 422
 423         dbg("%s arg not supported", __func__);
 424
 425         return -ENOIOCTLCMD;
 426 }
 427
 428 static void ssu100_set_max_packet_size(struct usb_serial_port *port)
 429 {
 430         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 431         struct usb_serial *serial = port->serial;
 432         struct usb_device *udev = serial->dev;
 433
 434         struct usb_interface *interface = serial->interface;
 435         struct usb_endpoint_descriptor *ep_desc = &interface->cur_altsetting->endpoint[1].desc;
 436
 437         unsigned num_endpoints;
 438         int i;
 439         unsigned long flags;
 440
 441         num_endpoints = interface->cur_altsetting->desc.bNumEndpoints;
 442         dev_info(&udev->dev, "Number of endpoints %d\n", num_endpoints);
 443
 444         for (i = 0; i < num_endpoints; i++) {
 445                 dev_info(&udev->dev, "Endpoint %d MaxPacketSize %d\n", i+1,
 446                         interface->cur_altsetting->endpoint[i].desc.wMaxPacketSize);
 447                 ep_desc = &interface->cur_altsetting->endpoint[i].desc;
 448         }
 449
 450         /* set max packet size based on descriptor */
 451         spin_lock_irqsave(&priv->status_lock, flags);
 452         priv->max_packet_size = ep_desc->wMaxPacketSize;
 453         spin_unlock_irqrestore(&priv->status_lock, flags);
 454
 455         dev_info(&udev->dev, "Setting MaxPacketSize %d\n", priv->max_packet_size);
 456 }
 457
 458 static int ssu100_attach(struct usb_serial *serial)
 459 {
 460         struct ssu100_port_private *priv;
 461         struct usb_serial_port *port = *serial->port;
 462
 463         dbg("%s", __func__);
 464
 465         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 466         if (!priv) {
 467                 dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
 468                         sizeof(*priv));
 469                 return -ENOMEM;
 470         }
 471
 472         spin_lock_init(&priv->status_lock);
 473         init_waitqueue_head(&priv->delta_msr_wait);
 474         usb_set_serial_port_data(port, priv);
 475         ssu100_set_max_packet_size(port);
 476
 477         return ssu100_initdevice(serial->dev);
 478 }
 479
 480 static int ssu100_tiocmget(struct tty_struct *tty, struct file *file)
 481 {
 482         struct usb_serial_port *port = tty->driver_data;
 483         struct usb_device *dev = port->serial->dev;
 484         u8 *d;
 485         int r;
 486
 487         dbg("%s\n", __func__);
 488
 489         d = kzalloc(2, GFP_KERNEL);
 490         if (!d)
 491                 return -ENOMEM;
 492
 493         r = ssu100_getregister(dev, 0, UART_MCR, d);
 494         if (r < 0)
 495                 goto mget_out;
 496
 497         r = ssu100_getregister(dev, 0, UART_MSR, d+1);
 498         if (r < 0)
 499                 goto mget_out;
 500
 501         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 502                 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 503                 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 504                 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 505                 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 506                 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 507
 508 mget_out:
 509         kfree(d);
 510         return r;
 511 }
 512
 513 static int ssu100_tiocmset(struct tty_struct *tty, struct file *file,
 514                            unsigned int set, unsigned int clear)
 515 {
 516         struct usb_serial_port *port = tty->driver_data;
 517         struct usb_device *dev = port->serial->dev;
 518
 519         dbg("%s\n", __func__);
 520         return update_mctrl(dev, set, clear);
 521 }
 522
 523 static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
 524 {
 525         struct usb_device *dev = port->serial->dev;
 526
 527         dbg("%s\n", __func__);
 528
 529         mutex_lock(&port->serial->disc_mutex);
 530         if (!port->serial->disconnected) {
 531                 /* Disable flow control */
 532                 if (!on &&
 533                     ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
 534                         dev_err(&port->dev, "error from flowcontrol urb\n");
 535                 /* drop RTS and DTR */
 536                 if (on)
 537                         set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 538                 else
 539                         clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 540         }
 541         mutex_unlock(&port->serial->disc_mutex);
 542 }
 543
 544 static int ssu100_process_packet(struct tty_struct *tty,
 545                                  struct usb_serial_port *port,
 546                                  struct ssu100_port_private *priv,
 547                                  char *packet, int len)
 548 {
 549         int i;
 550         char flag;
 551         char *ch;
 552
 553         dbg("%s - port %d", __func__, port->number);
 554
 555         if ((len >= 4) &&
 556             (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
 557             ((packet[2] == 0x00) || (packet[2] == 0x01))) {
 558                 if (packet[2] == 0x00)
 559                         priv->shadowLSR = packet[3] & (UART_LSR_OE |
 560                                                        UART_LSR_PE |
 561                                                        UART_LSR_FE |
 562                                                        UART_LSR_BI);
 563
 564                 if (packet[2] == 0x01) {
 565                         priv->shadowMSR = packet[3];
 566                         wake_up_interruptible(&priv->delta_msr_wait);
 567                 }
 568
 569                 len -= 4;
 570                 ch = packet + 4;
 571         } else
 572                 ch = packet;
 573
 574         if (!len)
 575                 return 0;       /* status only */
 576
 577         if (port->port.console && port->sysrq) {
 578                 for (i = 0; i < len; i++, ch++) {
 579                         if (!usb_serial_handle_sysrq_char(tty, port, *ch))
 580                                 tty_insert_flip_char(tty, *ch, flag);
 581                 }
 582         } else
 583                 tty_insert_flip_string_fixed_flag(tty, ch, flag, len);
 584
 585         return len;
 586 }
 587
 588 static void ssu100_process_read_urb(struct urb *urb)
 589 {
 590         struct usb_serial_port *port = urb->context;
 591         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 592         char *data = (char *)urb->transfer_buffer;
 593         struct tty_struct *tty;
 594         int count = 0;
 595         int i;
 596         int len;
 597
 598         dbg("%s", __func__);
 599
 600         tty = tty_port_tty_get(&port->port);
 601         if (!tty)
 602                 return;
 603
 604         for (i = 0; i < urb->actual_length; i += priv->max_packet_size) {
 605                 len = min_t(int, urb->actual_length - i, priv->max_packet_size);
 606                 count += ssu100_process_packet(tty, port, priv, &data[i], len);
 607         }
 608
 609         if (count)
 610                 tty_flip_buffer_push(tty);
 611         tty_kref_put(tty);
 612 }
 613
 614
 615 static struct usb_serial_driver ssu100_device = {
 616         .driver = {
 617                 .owner = THIS_MODULE,
 618                 .name = "ssu100",
 619         },
 620         .description         = DRIVER_DESC,
 621         .id_table            = id_table,
 622         .usb_driver          = &ssu100_driver,
 623         .num_ports           = 1,
 624         .bulk_in_size        = 256,
 625         .bulk_out_size       = 256,
 626         .open                = ssu100_open,
 627         .close               = ssu100_close,
 628         .attach              = ssu100_attach,
 629         .release             = ssu100_release,
 630         .dtr_rts             = ssu100_dtr_rts,
 631         .process_read_urb    = ssu100_process_read_urb,
 632         .tiocmget            = ssu100_tiocmget,
 633         .tiocmset            = ssu100_tiocmset,
 634         .ioctl               = ssu100_ioctl,
 635         .set_termios         = ssu100_set_termios,
 636 };
 637
 638 static int __init ssu100_init(void)
 639 {
 640         int retval;
 641
 642         dbg("%s", __func__);
 643
 644         /* register with usb-serial */
 645         retval = usb_serial_register(&ssu100_device);
 646
 647         if (retval)
 648                 goto failed_usb_sio_register;
 649
 650         retval = usb_register(&ssu100_driver);
 651         if (retval)
 652                 goto failed_usb_register;
 653
 654         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 655                DRIVER_DESC "\n");
 656
 657         return 0;
 658
 659 failed_usb_register:
 660         usb_serial_deregister(&ssu100_device);
 661 failed_usb_sio_register:
 662         return retval;
 663 }
 664
 665 static void __exit ssu100_exit(void)
 666 {
 667         usb_deregister(&ssu100_driver);
 668         usb_serial_deregister(&ssu100_device);
 669 }
 670
 671 module_init(ssu100_init);
 672 module_exit(ssu100_exit);
 673
 674 MODULE_DESCRIPTION(DRIVER_DESC);
 675 MODULE_LICENSE("GPL");
 676
 677 module_param(debug, bool, S_IRUGO | S_IWUSR);
 678 MODULE_PARM_DESC(debug, "Debug enabled or not");