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 bool debug;
  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         .id_table                      = id_table,
  69 };
  70
  71 struct ssu100_port_private {
  72         spinlock_t status_lock;
  73         u8 shadowLSR;
  74         u8 shadowMSR;
  75         wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
  76         struct async_icount icount;
  77 };
  78
  79 static void ssu100_release(struct usb_serial *serial)
  80 {
  81         struct ssu100_port_private *priv = usb_get_serial_port_data(*serial->port);
  82
  83         kfree(priv);
  84 }
  85
  86 static inline int ssu100_control_msg(struct usb_device *dev,
  87                                      u8 request, u16 data, u16 index)
  88 {
  89         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  90                                request, 0x40, data, index,
  91                                NULL, 0, 300);
  92 }
  93
  94 static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
  95 {
  96         u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));
  97
  98         return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
  99 }
 100
 101
 102 static inline int ssu100_getdevice(struct usb_device *dev, u8 *data)
 103 {
 104         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 105                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
 106                                data, 3, 300);
 107 }
 108
 109 static inline int ssu100_getregister(struct usb_device *dev,
 110                                      unsigned short uart,
 111                                      unsigned short reg,
 112                                      u8 *data)
 113 {
 114         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 115                                QT_SET_GET_REGISTER, 0xc0, reg,
 116                                uart, data, sizeof(*data), 300);
 117
 118 }
 119
 120
 121 static inline int ssu100_setregister(struct usb_device *dev,
 122                                      unsigned short uart,
 123                                      unsigned short reg,
 124                                      u16 data)
 125 {
 126         u16 value = (data << 8) | reg;
 127
 128         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 129                                QT_SET_GET_REGISTER, 0x40, value, uart,
 130                                NULL, 0, 300);
 131
 132 }
 133
 134 #define set_mctrl(dev, set)             update_mctrl((dev), (set), 0)
 135 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
 136
 137 /* these do not deal with device that have more than 1 port */
 138 static inline int update_mctrl(struct usb_device *dev, unsigned int set,
 139                                unsigned int clear)
 140 {
 141         unsigned urb_value;
 142         int result;
 143
 144         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 145                 dbg("%s - DTR|RTS not being set|cleared", __func__);
 146                 return 0;       /* no change */
 147         }
 148
 149         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 150         urb_value = 0;
 151         if (set & TIOCM_DTR)
 152                 urb_value |= UART_MCR_DTR;
 153         if (set & TIOCM_RTS)
 154                 urb_value |= UART_MCR_RTS;
 155
 156         result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
 157         if (result < 0)
 158                 dbg("%s Error from MODEM_CTRL urb", __func__);
 159
 160         return result;
 161 }
 162
 163 static int ssu100_initdevice(struct usb_device *dev)
 164 {
 165         u8 *data;
 166         int result = 0;
 167
 168         data = kzalloc(3, GFP_KERNEL);
 169         if (!data)
 170                 return -ENOMEM;
 171
 172         result = ssu100_getdevice(dev, data);
 173         if (result < 0) {
 174                 dbg("%s - get_device failed %i", __func__, result);
 175                 goto out;
 176         }
 177
 178         data[1] &= ~FULLPWRBIT;
 179
 180         result = ssu100_setdevice(dev, data);
 181         if (result < 0) {
 182                 dbg("%s - setdevice failed %i", __func__, result);
 183                 goto out;
 184         }
 185
 186         result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
 187         if (result < 0) {
 188                 dbg("%s - set prebuffer level failed %i", __func__, result);
 189                 goto out;
 190         }
 191
 192         result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
 193         if (result < 0) {
 194                 dbg("%s - set ATFprebuffer level failed %i", __func__, result);
 195                 goto out;
 196         }
 197
 198         result = ssu100_getdevice(dev, data);
 199         if (result < 0) {
 200                 dbg("%s - get_device failed %i", __func__, result);
 201                 goto out;
 202         }
 203
 204         data[0] &= ~(RR_BITS | DUPMODE_BITS);
 205         data[0] |= CLKS_X4;
 206         data[1] &= ~(LOOPMODE_BITS);
 207         data[1] |= RS232_MODE;
 208
 209         result = ssu100_setdevice(dev, data);
 210         if (result < 0) {
 211                 dbg("%s - setdevice failed %i", __func__, result);
 212                 goto out;
 213         }
 214
 215 out:    kfree(data);
 216         return result;
 217
 218 }
 219
 220
 221 static void ssu100_set_termios(struct tty_struct *tty,
 222                                struct usb_serial_port *port,
 223                                struct ktermios *old_termios)
 224 {
 225         struct usb_device *dev = port->serial->dev;
 226         struct ktermios *termios = tty->termios;
 227         u16 baud, divisor, remainder;
 228         unsigned int cflag = termios->c_cflag;
 229         u16 urb_value = 0; /* will hold the new flags */
 230         int result;
 231
 232         if (cflag & PARENB) {
 233                 if (cflag & PARODD)
 234                         urb_value |= UART_LCR_PARITY;
 235                 else
 236                         urb_value |= SERIAL_EVEN_PARITY;
 237         }
 238
 239         switch (cflag & CSIZE) {
 240         case CS5:
 241                 urb_value |= UART_LCR_WLEN5;
 242                 break;
 243         case CS6:
 244                 urb_value |= UART_LCR_WLEN6;
 245                 break;
 246         case CS7:
 247                 urb_value |= UART_LCR_WLEN7;
 248                 break;
 249         default:
 250         case CS8:
 251                 urb_value |= UART_LCR_WLEN8;
 252                 break;
 253         }
 254
 255         baud = tty_get_baud_rate(tty);
 256         if (!baud)
 257                 baud = 9600;
 258
 259         dbg("%s - got baud = %d\n", __func__, baud);
 260
 261
 262         divisor = MAX_BAUD_RATE / baud;
 263         remainder = MAX_BAUD_RATE % baud;
 264         if (((remainder * 2) >= baud) && (baud != 110))
 265                 divisor++;
 266
 267         urb_value = urb_value << 8;
 268
 269         result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
 270         if (result < 0)
 271                 dbg("%s - set uart failed", __func__);
 272
 273         if (cflag & CRTSCTS)
 274                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 275                                             SERIAL_CRTSCTS, 0);
 276         else
 277                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 278                                             0, 0);
 279         if (result < 0)
 280                 dbg("%s - set HW flow control failed", __func__);
 281
 282         if (I_IXOFF(tty) || I_IXON(tty)) {
 283                 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));
 284
 285                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 286                                             x, 0);
 287         } else
 288                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 289                                             0, 0);
 290
 291         if (result < 0)
 292                 dbg("%s - set SW flow control failed", __func__);
 293
 294 }
 295
 296
 297 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
 298 {
 299         struct usb_device *dev = port->serial->dev;
 300         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 301         u8 *data;
 302         int result;
 303         unsigned long flags;
 304
 305         data = kzalloc(2, GFP_KERNEL);
 306         if (!data)
 307                 return -ENOMEM;
 308
 309         result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 310                                  QT_OPEN_CLOSE_CHANNEL,
 311                                  QT_TRANSFER_IN, 0x01,
 312                                  0, data, 2, 300);
 313         if (result < 0) {
 314                 dbg("%s - open failed %i", __func__, result);
 315                 kfree(data);
 316                 return result;
 317         }
 318
 319         spin_lock_irqsave(&priv->status_lock, flags);
 320         priv->shadowLSR = data[0];
 321         priv->shadowMSR = data[1];
 322         spin_unlock_irqrestore(&priv->status_lock, flags);
 323
 324         kfree(data);
 325
 326 /* set to 9600 */
 327         result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
 328         if (result < 0)
 329                 dbg("%s - set uart failed", __func__);
 330
 331         if (tty)
 332                 ssu100_set_termios(tty, port, tty->termios);
 333
 334         return usb_serial_generic_open(tty, port);
 335 }
 336
 337 static void ssu100_close(struct usb_serial_port *port)
 338 {
 339         usb_serial_generic_close(port);
 340 }
 341
 342 static int get_serial_info(struct usb_serial_port *port,
 343                            struct serial_struct __user *retinfo)
 344 {
 345         struct serial_struct tmp;
 346
 347         if (!retinfo)
 348                 return -EFAULT;
 349
 350         memset(&tmp, 0, sizeof(tmp));
 351         tmp.line                = port->serial->minor;
 352         tmp.port                = 0;
 353         tmp.irq                 = 0;
 354         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 355         tmp.xmit_fifo_size      = port->bulk_out_size;
 356         tmp.baud_base           = 9600;
 357         tmp.close_delay         = 5*HZ;
 358         tmp.closing_wait        = 30*HZ;
 359
 360         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 361                 return -EFAULT;
 362         return 0;
 363 }
 364
 365 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 366 {
 367         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 368         struct async_icount prev, cur;
 369         unsigned long flags;
 370
 371         spin_lock_irqsave(&priv->status_lock, flags);
 372         prev = priv->icount;
 373         spin_unlock_irqrestore(&priv->status_lock, flags);
 374
 375         while (1) {
 376                 wait_event_interruptible(priv->delta_msr_wait,
 377                                          ((priv->icount.rng != prev.rng) ||
 378                                           (priv->icount.dsr != prev.dsr) ||
 379                                           (priv->icount.dcd != prev.dcd) ||
 380                                           (priv->icount.cts != prev.cts)));
 381
 382                 if (signal_pending(current))
 383                         return -ERESTARTSYS;
 384
 385                 spin_lock_irqsave(&priv->status_lock, flags);
 386                 cur = priv->icount;
 387                 spin_unlock_irqrestore(&priv->status_lock, flags);
 388
 389                 if ((prev.rng == cur.rng) &&
 390                     (prev.dsr == cur.dsr) &&
 391                     (prev.dcd == cur.dcd) &&
 392                     (prev.cts == cur.cts))
 393                         return -EIO;
 394
 395                 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
 396                     (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
 397                     (arg & TIOCM_CD  && (prev.dcd != cur.dcd)) ||
 398                     (arg & TIOCM_CTS && (prev.cts != cur.cts)))
 399                         return 0;
 400         }
 401         return 0;
 402 }
 403
 404 static int ssu100_get_icount(struct tty_struct *tty,
 405                         struct serial_icounter_struct *icount)
 406 {
 407         struct usb_serial_port *port = tty->driver_data;
 408         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 409         struct async_icount cnow = priv->icount;
 410
 411         icount->cts = cnow.cts;
 412         icount->dsr = cnow.dsr;
 413         icount->rng = cnow.rng;
 414         icount->dcd = cnow.dcd;
 415         icount->rx = cnow.rx;
 416         icount->tx = cnow.tx;
 417         icount->frame = cnow.frame;
 418         icount->overrun = cnow.overrun;
 419         icount->parity = cnow.parity;
 420         icount->brk = cnow.brk;
 421         icount->buf_overrun = cnow.buf_overrun;
 422
 423         return 0;
 424 }
 425
 426
 427
 428 static int ssu100_ioctl(struct tty_struct *tty,
 429                     unsigned int cmd, unsigned long arg)
 430 {
 431         struct usb_serial_port *port = tty->driver_data;
 432
 433         dbg("%s cmd 0x%04x", __func__, cmd);
 434
 435         switch (cmd) {
 436         case TIOCGSERIAL:
 437                 return get_serial_info(port,
 438                                        (struct serial_struct __user *) arg);
 439
 440         case TIOCMIWAIT:
 441                 return wait_modem_info(port, arg);
 442
 443         default:
 444                 break;
 445         }
 446
 447         dbg("%s arg not supported", __func__);
 448
 449         return -ENOIOCTLCMD;
 450 }
 451
 452 static int ssu100_attach(struct usb_serial *serial)
 453 {
 454         struct ssu100_port_private *priv;
 455         struct usb_serial_port *port = *serial->port;
 456
 457         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 458         if (!priv) {
 459                 dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
 460                         sizeof(*priv));
 461                 return -ENOMEM;
 462         }
 463
 464         spin_lock_init(&priv->status_lock);
 465         init_waitqueue_head(&priv->delta_msr_wait);
 466         usb_set_serial_port_data(port, priv);
 467
 468         return ssu100_initdevice(serial->dev);
 469 }
 470
 471 static int ssu100_tiocmget(struct tty_struct *tty)
 472 {
 473         struct usb_serial_port *port = tty->driver_data;
 474         struct usb_device *dev = port->serial->dev;
 475         u8 *d;
 476         int r;
 477
 478         d = kzalloc(2, GFP_KERNEL);
 479         if (!d)
 480                 return -ENOMEM;
 481
 482         r = ssu100_getregister(dev, 0, UART_MCR, d);
 483         if (r < 0)
 484                 goto mget_out;
 485
 486         r = ssu100_getregister(dev, 0, UART_MSR, d+1);
 487         if (r < 0)
 488                 goto mget_out;
 489
 490         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 491                 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 492                 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 493                 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 494                 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 495                 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 496
 497 mget_out:
 498         kfree(d);
 499         return r;
 500 }
 501
 502 static int ssu100_tiocmset(struct tty_struct *tty,
 503                            unsigned int set, unsigned int clear)
 504 {
 505         struct usb_serial_port *port = tty->driver_data;
 506         struct usb_device *dev = port->serial->dev;
 507
 508         return update_mctrl(dev, set, clear);
 509 }
 510
 511 static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
 512 {
 513         struct usb_device *dev = port->serial->dev;
 514
 515         mutex_lock(&port->serial->disc_mutex);
 516         if (!port->serial->disconnected) {
 517                 /* Disable flow control */
 518                 if (!on &&
 519                     ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
 520                         dev_err(&port->dev, "error from flowcontrol urb\n");
 521                 /* drop RTS and DTR */
 522                 if (on)
 523                         set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 524                 else
 525                         clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 526         }
 527         mutex_unlock(&port->serial->disc_mutex);
 528 }
 529
 530 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
 531 {
 532         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 533         unsigned long flags;
 534
 535         spin_lock_irqsave(&priv->status_lock, flags);
 536         priv->shadowMSR = msr;
 537         spin_unlock_irqrestore(&priv->status_lock, flags);
 538
 539         if (msr & UART_MSR_ANY_DELTA) {
 540                 /* update input line counters */
 541                 if (msr & UART_MSR_DCTS)
 542                         priv->icount.cts++;
 543                 if (msr & UART_MSR_DDSR)
 544                         priv->icount.dsr++;
 545                 if (msr & UART_MSR_DDCD)
 546                         priv->icount.dcd++;
 547                 if (msr & UART_MSR_TERI)
 548                         priv->icount.rng++;
 549                 wake_up_interruptible(&priv->delta_msr_wait);
 550         }
 551 }
 552
 553 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
 554                               char *tty_flag)
 555 {
 556         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 557         unsigned long flags;
 558
 559         spin_lock_irqsave(&priv->status_lock, flags);
 560         priv->shadowLSR = lsr;
 561         spin_unlock_irqrestore(&priv->status_lock, flags);
 562
 563         *tty_flag = TTY_NORMAL;
 564         if (lsr & UART_LSR_BRK_ERROR_BITS) {
 565                 /* we always want to update icount, but we only want to
 566                  * update tty_flag for one case */
 567                 if (lsr & UART_LSR_BI) {
 568                         priv->icount.brk++;
 569                         *tty_flag = TTY_BREAK;
 570                         usb_serial_handle_break(port);
 571                 }
 572                 if (lsr & UART_LSR_PE) {
 573                         priv->icount.parity++;
 574                         if (*tty_flag == TTY_NORMAL)
 575                                 *tty_flag = TTY_PARITY;
 576                 }
 577                 if (lsr & UART_LSR_FE) {
 578                         priv->icount.frame++;
 579                         if (*tty_flag == TTY_NORMAL)
 580                                 *tty_flag = TTY_FRAME;
 581                 }
 582                 if (lsr & UART_LSR_OE){
 583                         priv->icount.overrun++;
 584                         if (*tty_flag == TTY_NORMAL)
 585                                 *tty_flag = TTY_OVERRUN;
 586                 }
 587         }
 588
 589 }
 590
 591 static int ssu100_process_packet(struct urb *urb,
 592                                  struct tty_struct *tty)
 593 {
 594         struct usb_serial_port *port = urb->context;
 595         char *packet = (char *)urb->transfer_buffer;
 596         char flag = TTY_NORMAL;
 597         u32 len = urb->actual_length;
 598         int i;
 599         char *ch;
 600
 601         if ((len >= 4) &&
 602             (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
 603             ((packet[2] == 0x00) || (packet[2] == 0x01))) {
 604                 if (packet[2] == 0x00) {
 605                         ssu100_update_lsr(port, packet[3], &flag);
 606                         if (flag == TTY_OVERRUN)
 607                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 608                 }
 609                 if (packet[2] == 0x01)
 610                         ssu100_update_msr(port, packet[3]);
 611
 612                 len -= 4;
 613                 ch = packet + 4;
 614         } else
 615                 ch = packet;
 616
 617         if (!len)
 618                 return 0;       /* status only */
 619
 620         if (port->port.console && port->sysrq) {
 621                 for (i = 0; i < len; i++, ch++) {
 622                         if (!usb_serial_handle_sysrq_char(port, *ch))
 623                                 tty_insert_flip_char(tty, *ch, flag);
 624                 }
 625         } else
 626                 tty_insert_flip_string_fixed_flag(tty, ch, flag, len);
 627
 628         return len;
 629 }
 630
 631 static void ssu100_process_read_urb(struct urb *urb)
 632 {
 633         struct usb_serial_port *port = urb->context;
 634         struct tty_struct *tty;
 635         int count;
 636
 637         tty = tty_port_tty_get(&port->port);
 638         if (!tty)
 639                 return;
 640
 641         count = ssu100_process_packet(urb, tty);
 642
 643         if (count)
 644                 tty_flip_buffer_push(tty);
 645         tty_kref_put(tty);
 646 }
 647
 648 static struct usb_serial_driver ssu100_device = {
 649         .driver = {
 650                 .owner = THIS_MODULE,
 651                 .name = "ssu100",
 652         },
 653         .description         = DRIVER_DESC,
 654         .id_table            = id_table,
 655         .num_ports           = 1,
 656         .open                = ssu100_open,
 657         .close               = ssu100_close,
 658         .attach              = ssu100_attach,
 659         .release             = ssu100_release,
 660         .dtr_rts             = ssu100_dtr_rts,
 661         .process_read_urb    = ssu100_process_read_urb,
 662         .tiocmget            = ssu100_tiocmget,
 663         .tiocmset            = ssu100_tiocmset,
 664         .get_icount          = ssu100_get_icount,
 665         .ioctl               = ssu100_ioctl,
 666         .set_termios         = ssu100_set_termios,
 667         .disconnect          = usb_serial_generic_disconnect,
 668 };
 669
 670 static struct usb_serial_driver * const serial_drivers[] = {
 671         &ssu100_device, NULL
 672 };
 673
 674 module_usb_serial_driver(ssu100_driver, serial_drivers);
 675
 676 MODULE_DESCRIPTION(DRIVER_DESC);
 677 MODULE_LICENSE("GPL");
 678
 679 module_param(debug, bool, S_IRUGO | S_IWUSR);
 680 MODULE_PARM_DESC(debug, "Debug enabled or not");