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         wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
  82         struct async_icount icount;
  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];
 334         priv->shadowMSR = data[1];
 335         spin_unlock_irqrestore(&priv->status_lock, flags);
 336
 337         kfree(data);
 338
 339 /* set to 9600 */
 340         result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
 341         if (result < 0)
 342                 dbg("%s - set uart failed", __func__);
 343
 344         if (tty)
 345                 ssu100_set_termios(tty, port, tty->termios);
 346
 347         return usb_serial_generic_open(tty, port);
 348 }
 349
 350 static void ssu100_close(struct usb_serial_port *port)
 351 {
 352         dbg("%s", __func__);
 353         usb_serial_generic_close(port);
 354 }
 355
 356 static int get_serial_info(struct usb_serial_port *port,
 357                            struct serial_struct __user *retinfo)
 358 {
 359         struct serial_struct tmp;
 360
 361         if (!retinfo)
 362                 return -EFAULT;
 363
 364         memset(&tmp, 0, sizeof(tmp));
 365         tmp.line                = port->serial->minor;
 366         tmp.port                = 0;
 367         tmp.irq                 = 0;
 368         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 369         tmp.xmit_fifo_size      = port->bulk_out_size;
 370         tmp.baud_base           = 9600;
 371         tmp.close_delay         = 5*HZ;
 372         tmp.closing_wait        = 30*HZ;
 373
 374         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 375                 return -EFAULT;
 376         return 0;
 377 }
 378
 379 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 380 {
 381         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 382         struct async_icount prev, cur;
 383         unsigned long flags;
 384
 385         spin_lock_irqsave(&priv->status_lock, flags);
 386         prev = priv->icount;
 387         spin_unlock_irqrestore(&priv->status_lock, flags);
 388
 389         while (1) {
 390                 wait_event_interruptible(priv->delta_msr_wait,
 391                                          ((priv->icount.rng != prev.rng) ||
 392                                           (priv->icount.dsr != prev.dsr) ||
 393                                           (priv->icount.dcd != prev.dcd) ||
 394                                           (priv->icount.cts != prev.cts)));
 395
 396                 if (signal_pending(current))
 397                         return -ERESTARTSYS;
 398
 399                 spin_lock_irqsave(&priv->status_lock, flags);
 400                 cur = priv->icount;
 401                 spin_unlock_irqrestore(&priv->status_lock, flags);
 402
 403                 if ((prev.rng == cur.rng) &&
 404                     (prev.dsr == cur.dsr) &&
 405                     (prev.dcd == cur.dcd) &&
 406                     (prev.cts == cur.cts))
 407                         return -EIO;
 408
 409                 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
 410                     (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
 411                     (arg & TIOCM_CD  && (prev.dcd != cur.dcd)) ||
 412                     (arg & TIOCM_CTS && (prev.cts != cur.cts)))
 413                         return 0;
 414         }
 415         return 0;
 416 }
 417
 418 static int ssu100_get_icount(struct tty_struct *tty,
 419                         struct serial_icounter_struct *icount)
 420 {
 421         struct usb_serial_port *port = tty->driver_data;
 422         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 423         struct async_icount cnow = priv->icount;
 424
 425         icount->cts = cnow.cts;
 426         icount->dsr = cnow.dsr;
 427         icount->rng = cnow.rng;
 428         icount->dcd = cnow.dcd;
 429         icount->rx = cnow.rx;
 430         icount->tx = cnow.tx;
 431         icount->frame = cnow.frame;
 432         icount->overrun = cnow.overrun;
 433         icount->parity = cnow.parity;
 434         icount->brk = cnow.brk;
 435         icount->buf_overrun = cnow.buf_overrun;
 436
 437         return 0;
 438 }
 439
 440
 441
 442 static int ssu100_ioctl(struct tty_struct *tty, struct file *file,
 443                     unsigned int cmd, unsigned long arg)
 444 {
 445         struct usb_serial_port *port = tty->driver_data;
 446
 447         dbg("%s cmd 0x%04x", __func__, cmd);
 448
 449         switch (cmd) {
 450         case TIOCGSERIAL:
 451                 return get_serial_info(port,
 452                                        (struct serial_struct __user *) arg);
 453
 454         case TIOCMIWAIT:
 455                 return wait_modem_info(port, arg);
 456
 457         default:
 458                 break;
 459         }
 460
 461         dbg("%s arg not supported", __func__);
 462
 463         return -ENOIOCTLCMD;
 464 }
 465
 466 static int ssu100_attach(struct usb_serial *serial)
 467 {
 468         struct ssu100_port_private *priv;
 469         struct usb_serial_port *port = *serial->port;
 470
 471         dbg("%s", __func__);
 472
 473         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 474         if (!priv) {
 475                 dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
 476                         sizeof(*priv));
 477                 return -ENOMEM;
 478         }
 479
 480         spin_lock_init(&priv->status_lock);
 481         init_waitqueue_head(&priv->delta_msr_wait);
 482         usb_set_serial_port_data(port, priv);
 483
 484         return ssu100_initdevice(serial->dev);
 485 }
 486
 487 static int ssu100_tiocmget(struct tty_struct *tty)
 488 {
 489         struct usb_serial_port *port = tty->driver_data;
 490         struct usb_device *dev = port->serial->dev;
 491         u8 *d;
 492         int r;
 493
 494         dbg("%s\n", __func__);
 495
 496         d = kzalloc(2, GFP_KERNEL);
 497         if (!d)
 498                 return -ENOMEM;
 499
 500         r = ssu100_getregister(dev, 0, UART_MCR, d);
 501         if (r < 0)
 502                 goto mget_out;
 503
 504         r = ssu100_getregister(dev, 0, UART_MSR, d+1);
 505         if (r < 0)
 506                 goto mget_out;
 507
 508         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 509                 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 510                 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 511                 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 512                 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 513                 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 514
 515 mget_out:
 516         kfree(d);
 517         return r;
 518 }
 519
 520 static int ssu100_tiocmset(struct tty_struct *tty, struct file *file,
 521                            unsigned int set, unsigned int clear)
 522 {
 523         struct usb_serial_port *port = tty->driver_data;
 524         struct usb_device *dev = port->serial->dev;
 525
 526         dbg("%s\n", __func__);
 527         return update_mctrl(dev, set, clear);
 528 }
 529
 530 static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
 531 {
 532         struct usb_device *dev = port->serial->dev;
 533
 534         dbg("%s\n", __func__);
 535
 536         mutex_lock(&port->serial->disc_mutex);
 537         if (!port->serial->disconnected) {
 538                 /* Disable flow control */
 539                 if (!on &&
 540                     ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
 541                         dev_err(&port->dev, "error from flowcontrol urb\n");
 542                 /* drop RTS and DTR */
 543                 if (on)
 544                         set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 545                 else
 546                         clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 547         }
 548         mutex_unlock(&port->serial->disc_mutex);
 549 }
 550
 551 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
 552 {
 553         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 554         unsigned long flags;
 555
 556         spin_lock_irqsave(&priv->status_lock, flags);
 557         priv->shadowMSR = msr;
 558         spin_unlock_irqrestore(&priv->status_lock, flags);
 559
 560         if (msr & UART_MSR_ANY_DELTA) {
 561                 /* update input line counters */
 562                 if (msr & UART_MSR_DCTS)
 563                         priv->icount.cts++;
 564                 if (msr & UART_MSR_DDSR)
 565                         priv->icount.dsr++;
 566                 if (msr & UART_MSR_DDCD)
 567                         priv->icount.dcd++;
 568                 if (msr & UART_MSR_TERI)
 569                         priv->icount.rng++;
 570                 wake_up_interruptible(&priv->delta_msr_wait);
 571         }
 572 }
 573
 574 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
 575                               char *tty_flag)
 576 {
 577         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 578         unsigned long flags;
 579
 580         spin_lock_irqsave(&priv->status_lock, flags);
 581         priv->shadowLSR = lsr;
 582         spin_unlock_irqrestore(&priv->status_lock, flags);
 583
 584         *tty_flag = TTY_NORMAL;
 585         if (lsr & UART_LSR_BRK_ERROR_BITS) {
 586                 /* we always want to update icount, but we only want to
 587                  * update tty_flag for one case */
 588                 if (lsr & UART_LSR_BI) {
 589                         priv->icount.brk++;
 590                         *tty_flag = TTY_BREAK;
 591                         usb_serial_handle_break(port);
 592                 }
 593                 if (lsr & UART_LSR_PE) {
 594                         priv->icount.parity++;
 595                         if (*tty_flag == TTY_NORMAL)
 596                                 *tty_flag = TTY_PARITY;
 597                 }
 598                 if (lsr & UART_LSR_FE) {
 599                         priv->icount.frame++;
 600                         if (*tty_flag == TTY_NORMAL)
 601                                 *tty_flag = TTY_FRAME;
 602                 }
 603                 if (lsr & UART_LSR_OE){
 604                         priv->icount.overrun++;
 605                         if (*tty_flag == TTY_NORMAL)
 606                                 *tty_flag = TTY_OVERRUN;
 607                 }
 608         }
 609
 610 }
 611
 612 static int ssu100_process_packet(struct urb *urb,
 613                                  struct tty_struct *tty)
 614 {
 615         struct usb_serial_port *port = urb->context;
 616         char *packet = (char *)urb->transfer_buffer;
 617         char flag = TTY_NORMAL;
 618         u32 len = urb->actual_length;
 619         int i;
 620         char *ch;
 621
 622         dbg("%s - port %d", __func__, port->number);
 623
 624         if ((len >= 4) &&
 625             (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
 626             ((packet[2] == 0x00) || (packet[2] == 0x01))) {
 627                 if (packet[2] == 0x00) {
 628                         ssu100_update_lsr(port, packet[3], &flag);
 629                         if (flag == TTY_OVERRUN)
 630                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 631                 }
 632                 if (packet[2] == 0x01)
 633                         ssu100_update_msr(port, packet[3]);
 634
 635                 len -= 4;
 636                 ch = packet + 4;
 637         } else
 638                 ch = packet;
 639
 640         if (!len)
 641                 return 0;       /* status only */
 642
 643         if (port->port.console && port->sysrq) {
 644                 for (i = 0; i < len; i++, ch++) {
 645                         if (!usb_serial_handle_sysrq_char(port, *ch))
 646                                 tty_insert_flip_char(tty, *ch, flag);
 647                 }
 648         } else
 649                 tty_insert_flip_string_fixed_flag(tty, ch, flag, len);
 650
 651         return len;
 652 }
 653
 654 static void ssu100_process_read_urb(struct urb *urb)
 655 {
 656         struct usb_serial_port *port = urb->context;
 657         struct tty_struct *tty;
 658         int count;
 659
 660         dbg("%s", __func__);
 661
 662         tty = tty_port_tty_get(&port->port);
 663         if (!tty)
 664                 return;
 665
 666         count = ssu100_process_packet(urb, tty);
 667
 668         if (count)
 669                 tty_flip_buffer_push(tty);
 670         tty_kref_put(tty);
 671 }
 672
 673 static struct usb_serial_driver ssu100_device = {
 674         .driver = {
 675                 .owner = THIS_MODULE,
 676                 .name = "ssu100",
 677         },
 678         .description         = DRIVER_DESC,
 679         .id_table            = id_table,
 680         .usb_driver          = &ssu100_driver,
 681         .num_ports           = 1,
 682         .open                = ssu100_open,
 683         .close               = ssu100_close,
 684         .attach              = ssu100_attach,
 685         .release             = ssu100_release,
 686         .dtr_rts             = ssu100_dtr_rts,
 687         .process_read_urb    = ssu100_process_read_urb,
 688         .tiocmget            = ssu100_tiocmget,
 689         .tiocmset            = ssu100_tiocmset,
 690         .get_icount          = ssu100_get_icount,
 691         .ioctl               = ssu100_ioctl,
 692         .set_termios         = ssu100_set_termios,
 693         .disconnect          = usb_serial_generic_disconnect,
 694 };
 695
 696 static int __init ssu100_init(void)
 697 {
 698         int retval;
 699
 700         dbg("%s", __func__);
 701
 702         /* register with usb-serial */
 703         retval = usb_serial_register(&ssu100_device);
 704
 705         if (retval)
 706                 goto failed_usb_sio_register;
 707
 708         retval = usb_register(&ssu100_driver);
 709         if (retval)
 710                 goto failed_usb_register;
 711
 712         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 713                DRIVER_DESC "\n");
 714
 715         return 0;
 716
 717 failed_usb_register:
 718         usb_serial_deregister(&ssu100_device);
 719 failed_usb_sio_register:
 720         return retval;
 721 }
 722
 723 static void __exit ssu100_exit(void)
 724 {
 725         usb_deregister(&ssu100_driver);
 726         usb_serial_deregister(&ssu100_device);
 727 }
 728
 729 module_init(ssu100_init);
 730 module_exit(ssu100_exit);
 731
 732 MODULE_DESCRIPTION(DRIVER_DESC);
 733 MODULE_LICENSE("GPL");
 734
 735 module_param(debug, bool, S_IRUGO | S_IWUSR);
 736 MODULE_PARM_DESC(debug, "Debug enabled or not");