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;
  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         struct async_icount icount;
  82 };
  83
  84 static void ssu100_release(struct usb_serial *serial)
  85 {
  86         struct ssu100_port_private *priv = usb_get_serial_port_data(*serial->port);
  87
  88         dbg("%s", __func__);
  89         kfree(priv);
  90 }
  91
  92 static inline int ssu100_control_msg(struct usb_device *dev,
  93                                      u8 request, u16 data, u16 index)
  94 {
  95         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  96                                request, 0x40, data, index,
  97                                NULL, 0, 300);
  98 }
  99
 100 static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
 101 {
 102         u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));
 103
 104         return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
 105 }
 106
 107
 108 static inline int ssu100_getdevice(struct usb_device *dev, u8 *data)
 109 {
 110         int ret;
 111
 112         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 113                               QT_SET_GET_DEVICE, 0xc0, 0, 0,
 114                               data, 3, 300);
 115         if (ret < 3) {
 116                 if (ret >= 0)
 117                         ret = -EIO;
 118         }
 119
 120         return ret;
 121 }
 122
 123 static inline int ssu100_getregister(struct usb_device *dev,
 124                                      unsigned short uart,
 125                                      unsigned short reg,
 126                                      u8 *data)
 127 {
 128         int ret;
 129
 130         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 131                               QT_SET_GET_REGISTER, 0xc0, reg,
 132                               uart, data, sizeof(*data), 300);
 133         if (ret < sizeof(*data)) {
 134                 if (ret >= 0)
 135                         ret = -EIO;
 136         }
 137
 138         return ret;
 139 }
 140
 141
 142 static inline int ssu100_setregister(struct usb_device *dev,
 143                                      unsigned short uart,
 144                                      unsigned short reg,
 145                                      u16 data)
 146 {
 147         u16 value = (data << 8) | reg;
 148
 149         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 150                                QT_SET_GET_REGISTER, 0x40, value, uart,
 151                                NULL, 0, 300);
 152
 153 }
 154
 155 #define set_mctrl(dev, set)             update_mctrl((dev), (set), 0)
 156 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
 157
 158 /* these do not deal with device that have more than 1 port */
 159 static inline int update_mctrl(struct usb_device *dev, unsigned int set,
 160                                unsigned int clear)
 161 {
 162         unsigned urb_value;
 163         int result;
 164
 165         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 166                 dbg("%s - DTR|RTS not being set|cleared", __func__);
 167                 return 0;       /* no change */
 168         }
 169
 170         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 171         urb_value = 0;
 172         if (set & TIOCM_DTR)
 173                 urb_value |= UART_MCR_DTR;
 174         if (set & TIOCM_RTS)
 175                 urb_value |= UART_MCR_RTS;
 176
 177         result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
 178         if (result < 0)
 179                 dbg("%s Error from MODEM_CTRL urb", __func__);
 180
 181         return result;
 182 }
 183
 184 static int ssu100_initdevice(struct usb_device *dev)
 185 {
 186         u8 *data;
 187         int result = 0;
 188
 189         dbg("%s", __func__);
 190
 191         data = kzalloc(3, GFP_KERNEL);
 192         if (!data)
 193                 return -ENOMEM;
 194
 195         result = ssu100_getdevice(dev, data);
 196         if (result < 0) {
 197                 dbg("%s - get_device failed %i", __func__, result);
 198                 goto out;
 199         }
 200
 201         data[1] &= ~FULLPWRBIT;
 202
 203         result = ssu100_setdevice(dev, data);
 204         if (result < 0) {
 205                 dbg("%s - setdevice failed %i", __func__, result);
 206                 goto out;
 207         }
 208
 209         result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
 210         if (result < 0) {
 211                 dbg("%s - set prebuffer level failed %i", __func__, result);
 212                 goto out;
 213         }
 214
 215         result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
 216         if (result < 0) {
 217                 dbg("%s - set ATFprebuffer level failed %i", __func__, result);
 218                 goto out;
 219         }
 220
 221         result = ssu100_getdevice(dev, data);
 222         if (result < 0) {
 223                 dbg("%s - get_device failed %i", __func__, result);
 224                 goto out;
 225         }
 226
 227         data[0] &= ~(RR_BITS | DUPMODE_BITS);
 228         data[0] |= CLKS_X4;
 229         data[1] &= ~(LOOPMODE_BITS);
 230         data[1] |= RS232_MODE;
 231
 232         result = ssu100_setdevice(dev, data);
 233         if (result < 0) {
 234                 dbg("%s - setdevice failed %i", __func__, result);
 235                 goto out;
 236         }
 237
 238 out:    kfree(data);
 239         return result;
 240
 241 }
 242
 243
 244 static void ssu100_set_termios(struct tty_struct *tty,
 245                                struct usb_serial_port *port,
 246                                struct ktermios *old_termios)
 247 {
 248         struct usb_device *dev = port->serial->dev;
 249         struct ktermios *termios = tty->termios;
 250         u16 baud, divisor, remainder;
 251         unsigned int cflag = termios->c_cflag;
 252         u16 urb_value = 0; /* will hold the new flags */
 253         int result;
 254
 255         dbg("%s", __func__);
 256
 257         if (cflag & PARENB) {
 258                 if (cflag & PARODD)
 259                         urb_value |= UART_LCR_PARITY;
 260                 else
 261                         urb_value |= SERIAL_EVEN_PARITY;
 262         }
 263
 264         switch (cflag & CSIZE) {
 265         case CS5:
 266                 urb_value |= UART_LCR_WLEN5;
 267                 break;
 268         case CS6:
 269                 urb_value |= UART_LCR_WLEN6;
 270                 break;
 271         case CS7:
 272                 urb_value |= UART_LCR_WLEN7;
 273                 break;
 274         default:
 275         case CS8:
 276                 urb_value |= UART_LCR_WLEN8;
 277                 break;
 278         }
 279
 280         baud = tty_get_baud_rate(tty);
 281         if (!baud)
 282                 baud = 9600;
 283
 284         dbg("%s - got baud = %d\n", __func__, baud);
 285
 286
 287         divisor = MAX_BAUD_RATE / baud;
 288         remainder = MAX_BAUD_RATE % baud;
 289         if (((remainder * 2) >= baud) && (baud != 110))
 290                 divisor++;
 291
 292         urb_value = urb_value << 8;
 293
 294         result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
 295         if (result < 0)
 296                 dbg("%s - set uart failed", __func__);
 297
 298         if (cflag & CRTSCTS)
 299                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 300                                             SERIAL_CRTSCTS, 0);
 301         else
 302                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 303                                             0, 0);
 304         if (result < 0)
 305                 dbg("%s - set HW flow control failed", __func__);
 306
 307         if (I_IXOFF(tty) || I_IXON(tty)) {
 308                 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));
 309
 310                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 311                                             x, 0);
 312         } else
 313                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 314                                             0, 0);
 315
 316         if (result < 0)
 317                 dbg("%s - set SW flow control failed", __func__);
 318
 319 }
 320
 321
 322 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
 323 {
 324         struct usb_device *dev = port->serial->dev;
 325         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 326         u8 *data;
 327         int result;
 328         unsigned long flags;
 329
 330         dbg("%s - port %d", __func__, port->number);
 331
 332         data = kzalloc(2, GFP_KERNEL);
 333         if (!data)
 334                 return -ENOMEM;
 335
 336         result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 337                                  QT_OPEN_CLOSE_CHANNEL,
 338                                  QT_TRANSFER_IN, 0x01,
 339                                  0, data, 2, 300);
 340         if (result < 2) {
 341                 dbg("%s - open failed %i", __func__, result);
 342                 if (result >= 0)
 343                         result = -EIO;
 344                 kfree(data);
 345                 return result;
 346         }
 347
 348         spin_lock_irqsave(&priv->status_lock, flags);
 349         priv->shadowLSR = data[0];
 350         priv->shadowMSR = data[1];
 351         spin_unlock_irqrestore(&priv->status_lock, flags);
 352
 353         kfree(data);
 354
 355 /* set to 9600 */
 356         result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
 357         if (result < 0)
 358                 dbg("%s - set uart failed", __func__);
 359
 360         if (tty)
 361                 ssu100_set_termios(tty, port, tty->termios);
 362
 363         return usb_serial_generic_open(tty, port);
 364 }
 365
 366 static void ssu100_close(struct usb_serial_port *port)
 367 {
 368         dbg("%s", __func__);
 369         usb_serial_generic_close(port);
 370 }
 371
 372 static int get_serial_info(struct usb_serial_port *port,
 373                            struct serial_struct __user *retinfo)
 374 {
 375         struct serial_struct tmp;
 376
 377         if (!retinfo)
 378                 return -EFAULT;
 379
 380         memset(&tmp, 0, sizeof(tmp));
 381         tmp.line                = port->serial->minor;
 382         tmp.port                = 0;
 383         tmp.irq                 = 0;
 384         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 385         tmp.xmit_fifo_size      = port->bulk_out_size;
 386         tmp.baud_base           = 9600;
 387         tmp.close_delay         = 5*HZ;
 388         tmp.closing_wait        = 30*HZ;
 389
 390         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 391                 return -EFAULT;
 392         return 0;
 393 }
 394
 395 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 396 {
 397         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 398         struct async_icount prev, cur;
 399         unsigned long flags;
 400
 401         spin_lock_irqsave(&priv->status_lock, flags);
 402         prev = priv->icount;
 403         spin_unlock_irqrestore(&priv->status_lock, flags);
 404
 405         while (1) {
 406                 wait_event_interruptible(port->delta_msr_wait,
 407                                          (port->serial->disconnected ||
 408                                           (priv->icount.rng != prev.rng) ||
 409                                           (priv->icount.dsr != prev.dsr) ||
 410                                           (priv->icount.dcd != prev.dcd) ||
 411                                           (priv->icount.cts != prev.cts)));
 412
 413                 if (signal_pending(current))
 414                         return -ERESTARTSYS;
 415
 416                 if (port->serial->disconnected)
 417                         return -EIO;
 418
 419                 spin_lock_irqsave(&priv->status_lock, flags);
 420                 cur = priv->icount;
 421                 spin_unlock_irqrestore(&priv->status_lock, flags);
 422
 423                 if ((prev.rng == cur.rng) &&
 424                     (prev.dsr == cur.dsr) &&
 425                     (prev.dcd == cur.dcd) &&
 426                     (prev.cts == cur.cts))
 427                         return -EIO;
 428
 429                 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
 430                     (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
 431                     (arg & TIOCM_CD  && (prev.dcd != cur.dcd)) ||
 432                     (arg & TIOCM_CTS && (prev.cts != cur.cts)))
 433                         return 0;
 434         }
 435         return 0;
 436 }
 437
 438 static int ssu100_get_icount(struct tty_struct *tty,
 439                         struct serial_icounter_struct *icount)
 440 {
 441         struct usb_serial_port *port = tty->driver_data;
 442         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 443         struct async_icount cnow = priv->icount;
 444
 445         icount->cts = cnow.cts;
 446         icount->dsr = cnow.dsr;
 447         icount->rng = cnow.rng;
 448         icount->dcd = cnow.dcd;
 449         icount->rx = cnow.rx;
 450         icount->tx = cnow.tx;
 451         icount->frame = cnow.frame;
 452         icount->overrun = cnow.overrun;
 453         icount->parity = cnow.parity;
 454         icount->brk = cnow.brk;
 455         icount->buf_overrun = cnow.buf_overrun;
 456
 457         return 0;
 458 }
 459
 460
 461
 462 static int ssu100_ioctl(struct tty_struct *tty,
 463                     unsigned int cmd, unsigned long arg)
 464 {
 465         struct usb_serial_port *port = tty->driver_data;
 466
 467         dbg("%s cmd 0x%04x", __func__, cmd);
 468
 469         switch (cmd) {
 470         case TIOCGSERIAL:
 471                 return get_serial_info(port,
 472                                        (struct serial_struct __user *) arg);
 473
 474         case TIOCMIWAIT:
 475                 return wait_modem_info(port, arg);
 476
 477         default:
 478                 break;
 479         }
 480
 481         dbg("%s arg not supported", __func__);
 482
 483         return -ENOIOCTLCMD;
 484 }
 485
 486 static int ssu100_attach(struct usb_serial *serial)
 487 {
 488         struct ssu100_port_private *priv;
 489         struct usb_serial_port *port = *serial->port;
 490
 491         dbg("%s", __func__);
 492
 493         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 494         if (!priv) {
 495                 dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
 496                         sizeof(*priv));
 497                 return -ENOMEM;
 498         }
 499
 500         spin_lock_init(&priv->status_lock);
 501         usb_set_serial_port_data(port, priv);
 502
 503         return ssu100_initdevice(serial->dev);
 504 }
 505
 506 static int ssu100_tiocmget(struct tty_struct *tty)
 507 {
 508         struct usb_serial_port *port = tty->driver_data;
 509         struct usb_device *dev = port->serial->dev;
 510         u8 *d;
 511         int r;
 512
 513         dbg("%s\n", __func__);
 514
 515         d = kzalloc(2, GFP_KERNEL);
 516         if (!d)
 517                 return -ENOMEM;
 518
 519         r = ssu100_getregister(dev, 0, UART_MCR, d);
 520         if (r < 0)
 521                 goto mget_out;
 522
 523         r = ssu100_getregister(dev, 0, UART_MSR, d+1);
 524         if (r < 0)
 525                 goto mget_out;
 526
 527         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 528                 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 529                 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 530                 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 531                 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 532                 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 533
 534 mget_out:
 535         kfree(d);
 536         return r;
 537 }
 538
 539 static int ssu100_tiocmset(struct tty_struct *tty,
 540                            unsigned int set, unsigned int clear)
 541 {
 542         struct usb_serial_port *port = tty->driver_data;
 543         struct usb_device *dev = port->serial->dev;
 544
 545         dbg("%s\n", __func__);
 546         return update_mctrl(dev, set, clear);
 547 }
 548
 549 static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
 550 {
 551         struct usb_device *dev = port->serial->dev;
 552
 553         dbg("%s\n", __func__);
 554
 555         /* Disable flow control */
 556         if (!on) {
 557                 if (ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
 558                         dev_err(&port->dev, "error from flowcontrol urb\n");
 559         }
 560         /* drop RTS and DTR */
 561         if (on)
 562                 set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 563         else
 564                 clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 565 }
 566
 567 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
 568 {
 569         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 570         unsigned long flags;
 571
 572         spin_lock_irqsave(&priv->status_lock, flags);
 573         priv->shadowMSR = msr;
 574         spin_unlock_irqrestore(&priv->status_lock, flags);
 575
 576         if (msr & UART_MSR_ANY_DELTA) {
 577                 /* update input line counters */
 578                 if (msr & UART_MSR_DCTS)
 579                         priv->icount.cts++;
 580                 if (msr & UART_MSR_DDSR)
 581                         priv->icount.dsr++;
 582                 if (msr & UART_MSR_DDCD)
 583                         priv->icount.dcd++;
 584                 if (msr & UART_MSR_TERI)
 585                         priv->icount.rng++;
 586                 wake_up_interruptible(&port->delta_msr_wait);
 587         }
 588 }
 589
 590 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
 591                               char *tty_flag)
 592 {
 593         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 594         unsigned long flags;
 595
 596         spin_lock_irqsave(&priv->status_lock, flags);
 597         priv->shadowLSR = lsr;
 598         spin_unlock_irqrestore(&priv->status_lock, flags);
 599
 600         *tty_flag = TTY_NORMAL;
 601         if (lsr & UART_LSR_BRK_ERROR_BITS) {
 602                 /* we always want to update icount, but we only want to
 603                  * update tty_flag for one case */
 604                 if (lsr & UART_LSR_BI) {
 605                         priv->icount.brk++;
 606                         *tty_flag = TTY_BREAK;
 607                         usb_serial_handle_break(port);
 608                 }
 609                 if (lsr & UART_LSR_PE) {
 610                         priv->icount.parity++;
 611                         if (*tty_flag == TTY_NORMAL)
 612                                 *tty_flag = TTY_PARITY;
 613                 }
 614                 if (lsr & UART_LSR_FE) {
 615                         priv->icount.frame++;
 616                         if (*tty_flag == TTY_NORMAL)
 617                                 *tty_flag = TTY_FRAME;
 618                 }
 619                 if (lsr & UART_LSR_OE) {
 620                         priv->icount.overrun++;
 621                         tty_insert_flip_char(tty_port_tty_get(&port->port),
 622                                              0, TTY_OVERRUN);
 623                 }
 624         }
 625
 626 }
 627
 628 static int ssu100_process_packet(struct urb *urb,
 629                                  struct tty_struct *tty)
 630 {
 631         struct usb_serial_port *port = urb->context;
 632         char *packet = (char *)urb->transfer_buffer;
 633         char flag = TTY_NORMAL;
 634         u32 len = urb->actual_length;
 635         int i;
 636         char *ch;
 637
 638         dbg("%s - port %d", __func__, port->number);
 639
 640         if ((len >= 4) &&
 641             (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
 642             ((packet[2] == 0x00) || (packet[2] == 0x01))) {
 643                 if (packet[2] == 0x00)
 644                         ssu100_update_lsr(port, packet[3], &flag);
 645                 if (packet[2] == 0x01)
 646                         ssu100_update_msr(port, packet[3]);
 647
 648                 len -= 4;
 649                 ch = packet + 4;
 650         } else
 651                 ch = packet;
 652
 653         if (!len)
 654                 return 0;       /* status only */
 655
 656         if (port->port.console && port->sysrq) {
 657                 for (i = 0; i < len; i++, ch++) {
 658                         if (!usb_serial_handle_sysrq_char(port, *ch))
 659                                 tty_insert_flip_char(tty, *ch, flag);
 660                 }
 661         } else
 662                 tty_insert_flip_string_fixed_flag(tty, ch, flag, len);
 663
 664         return len;
 665 }
 666
 667 static void ssu100_process_read_urb(struct urb *urb)
 668 {
 669         struct usb_serial_port *port = urb->context;
 670         struct tty_struct *tty;
 671         int count;
 672
 673         dbg("%s", __func__);
 674
 675         tty = tty_port_tty_get(&port->port);
 676         if (!tty)
 677                 return;
 678
 679         count = ssu100_process_packet(urb, tty);
 680
 681         if (count)
 682                 tty_flip_buffer_push(tty);
 683         tty_kref_put(tty);
 684 }
 685
 686 static struct usb_serial_driver ssu100_device = {
 687         .driver = {
 688                 .owner = THIS_MODULE,
 689                 .name = "ssu100",
 690         },
 691         .description         = DRIVER_DESC,
 692         .id_table            = id_table,
 693         .usb_driver          = &ssu100_driver,
 694         .num_ports           = 1,
 695         .open                = ssu100_open,
 696         .close               = ssu100_close,
 697         .attach              = ssu100_attach,
 698         .release             = ssu100_release,
 699         .dtr_rts             = ssu100_dtr_rts,
 700         .process_read_urb    = ssu100_process_read_urb,
 701         .tiocmget            = ssu100_tiocmget,
 702         .tiocmset            = ssu100_tiocmset,
 703         .get_icount          = ssu100_get_icount,
 704         .ioctl               = ssu100_ioctl,
 705         .set_termios         = ssu100_set_termios,
 706         .disconnect          = usb_serial_generic_disconnect,
 707 };
 708
 709 static int __init ssu100_init(void)
 710 {
 711         int retval;
 712
 713         dbg("%s", __func__);
 714
 715         /* register with usb-serial */
 716         retval = usb_serial_register(&ssu100_device);
 717
 718         if (retval)
 719                 goto failed_usb_sio_register;
 720
 721         retval = usb_register(&ssu100_driver);
 722         if (retval)
 723                 goto failed_usb_register;
 724
 725         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 726                DRIVER_DESC "\n");
 727
 728         return 0;
 729
 730 failed_usb_register:
 731         usb_serial_deregister(&ssu100_device);
 732 failed_usb_sio_register:
 733         return retval;
 734 }
 735
 736 static void __exit ssu100_exit(void)
 737 {
 738         usb_deregister(&ssu100_driver);
 739         usb_serial_deregister(&ssu100_device);
 740 }
 741
 742 module_init(ssu100_init);
 743 module_exit(ssu100_exit);
 744
 745 MODULE_DESCRIPTION(DRIVER_DESC);
 746 MODULE_LICENSE("GPL");
 747
 748 module_param(debug, bool, S_IRUGO | S_IWUSR);
 749 MODULE_PARM_DESC(debug, "Debug enabled or not");