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         .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         .supports_autosuspend          = 1,
  74 };
  75
  76 struct ssu100_port_private {
  77         spinlock_t status_lock;
  78         u8 shadowLSR;
  79         u8 shadowMSR;
  80         wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
  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         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 111                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
 112                                data, 3, 300);
 113 }
 114
 115 static inline int ssu100_getregister(struct usb_device *dev,
 116                                      unsigned short uart,
 117                                      unsigned short reg,
 118                                      u8 *data)
 119 {
 120         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 121                                QT_SET_GET_REGISTER, 0xc0, reg,
 122                                uart, data, sizeof(*data), 300);
 123
 124 }
 125
 126
 127 static inline int ssu100_setregister(struct usb_device *dev,
 128                                      unsigned short uart,
 129                                      unsigned short reg,
 130                                      u16 data)
 131 {
 132         u16 value = (data << 8) | reg;
 133
 134         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 135                                QT_SET_GET_REGISTER, 0x40, value, uart,
 136                                NULL, 0, 300);
 137
 138 }
 139
 140 #define set_mctrl(dev, set)             update_mctrl((dev), (set), 0)
 141 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
 142
 143 /* these do not deal with device that have more than 1 port */
 144 static inline int update_mctrl(struct usb_device *dev, unsigned int set,
 145                                unsigned int clear)
 146 {
 147         unsigned urb_value;
 148         int result;
 149
 150         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 151                 dbg("%s - DTR|RTS not being set|cleared", __func__);
 152                 return 0;       /* no change */
 153         }
 154
 155         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 156         urb_value = 0;
 157         if (set & TIOCM_DTR)
 158                 urb_value |= UART_MCR_DTR;
 159         if (set & TIOCM_RTS)
 160                 urb_value |= UART_MCR_RTS;
 161
 162         result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
 163         if (result < 0)
 164                 dbg("%s Error from MODEM_CTRL urb", __func__);
 165
 166         return result;
 167 }
 168
 169 static int ssu100_initdevice(struct usb_device *dev)
 170 {
 171         u8 *data;
 172         int result = 0;
 173
 174         dbg("%s", __func__);
 175
 176         data = kzalloc(3, GFP_KERNEL);
 177         if (!data)
 178                 return -ENOMEM;
 179
 180         result = ssu100_getdevice(dev, data);
 181         if (result < 0) {
 182                 dbg("%s - get_device failed %i", __func__, result);
 183                 goto out;
 184         }
 185
 186         data[1] &= ~FULLPWRBIT;
 187
 188         result = ssu100_setdevice(dev, data);
 189         if (result < 0) {
 190                 dbg("%s - setdevice failed %i", __func__, result);
 191                 goto out;
 192         }
 193
 194         result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
 195         if (result < 0) {
 196                 dbg("%s - set prebuffer level failed %i", __func__, result);
 197                 goto out;
 198         }
 199
 200         result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
 201         if (result < 0) {
 202                 dbg("%s - set ATFprebuffer level failed %i", __func__, result);
 203                 goto out;
 204         }
 205
 206         result = ssu100_getdevice(dev, data);
 207         if (result < 0) {
 208                 dbg("%s - get_device failed %i", __func__, result);
 209                 goto out;
 210         }
 211
 212         data[0] &= ~(RR_BITS | DUPMODE_BITS);
 213         data[0] |= CLKS_X4;
 214         data[1] &= ~(LOOPMODE_BITS);
 215         data[1] |= RS232_MODE;
 216
 217         result = ssu100_setdevice(dev, data);
 218         if (result < 0) {
 219                 dbg("%s - setdevice failed %i", __func__, result);
 220                 goto out;
 221         }
 222
 223 out:    kfree(data);
 224         return result;
 225
 226 }
 227
 228
 229 static void ssu100_set_termios(struct tty_struct *tty,
 230                                struct usb_serial_port *port,
 231                                struct ktermios *old_termios)
 232 {
 233         struct usb_device *dev = port->serial->dev;
 234         struct ktermios *termios = tty->termios;
 235         u16 baud, divisor, remainder;
 236         unsigned int cflag = termios->c_cflag;
 237         u16 urb_value = 0; /* will hold the new flags */
 238         int result;
 239
 240         dbg("%s", __func__);
 241
 242         if (cflag & PARENB) {
 243                 if (cflag & PARODD)
 244                         urb_value |= UART_LCR_PARITY;
 245                 else
 246                         urb_value |= SERIAL_EVEN_PARITY;
 247         }
 248
 249         switch (cflag & CSIZE) {
 250         case CS5:
 251                 urb_value |= UART_LCR_WLEN5;
 252                 break;
 253         case CS6:
 254                 urb_value |= UART_LCR_WLEN6;
 255                 break;
 256         case CS7:
 257                 urb_value |= UART_LCR_WLEN7;
 258                 break;
 259         default:
 260         case CS8:
 261                 urb_value |= UART_LCR_WLEN8;
 262                 break;
 263         }
 264
 265         baud = tty_get_baud_rate(tty);
 266         if (!baud)
 267                 baud = 9600;
 268
 269         dbg("%s - got baud = %d\n", __func__, baud);
 270
 271
 272         divisor = MAX_BAUD_RATE / baud;
 273         remainder = MAX_BAUD_RATE % baud;
 274         if (((remainder * 2) >= baud) && (baud != 110))
 275                 divisor++;
 276
 277         urb_value = urb_value << 8;
 278
 279         result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
 280         if (result < 0)
 281                 dbg("%s - set uart failed", __func__);
 282
 283         if (cflag & CRTSCTS)
 284                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 285                                             SERIAL_CRTSCTS, 0);
 286         else
 287                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 288                                             0, 0);
 289         if (result < 0)
 290                 dbg("%s - set HW flow control failed", __func__);
 291
 292         if (I_IXOFF(tty) || I_IXON(tty)) {
 293                 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));
 294
 295                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 296                                             x, 0);
 297         } else
 298                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 299                                             0, 0);
 300
 301         if (result < 0)
 302                 dbg("%s - set SW flow control failed", __func__);
 303
 304 }
 305
 306
 307 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
 308 {
 309         struct usb_device *dev = port->serial->dev;
 310         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 311         u8 *data;
 312         int result;
 313         unsigned long flags;
 314
 315         dbg("%s - port %d", __func__, port->number);
 316
 317         data = kzalloc(2, GFP_KERNEL);
 318         if (!data)
 319                 return -ENOMEM;
 320
 321         result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 322                                  QT_OPEN_CLOSE_CHANNEL,
 323                                  QT_TRANSFER_IN, 0x01,
 324                                  0, data, 2, 300);
 325         if (result < 0) {
 326                 dbg("%s - open failed %i", __func__, result);
 327                 kfree(data);
 328                 return result;
 329         }
 330
 331         spin_lock_irqsave(&priv->status_lock, flags);
 332         priv->shadowLSR = data[0];
 333         priv->shadowMSR = data[1];
 334         spin_unlock_irqrestore(&priv->status_lock, flags);
 335
 336         kfree(data);
 337
 338 /* set to 9600 */
 339         result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
 340         if (result < 0)
 341                 dbg("%s - set uart failed", __func__);
 342
 343         if (tty)
 344                 ssu100_set_termios(tty, port, tty->termios);
 345
 346         return usb_serial_generic_open(tty, port);
 347 }
 348
 349 static void ssu100_close(struct usb_serial_port *port)
 350 {
 351         dbg("%s", __func__);
 352         usb_serial_generic_close(port);
 353 }
 354
 355 static int get_serial_info(struct usb_serial_port *port,
 356                            struct serial_struct __user *retinfo)
 357 {
 358         struct serial_struct tmp;
 359
 360         if (!retinfo)
 361                 return -EFAULT;
 362
 363         memset(&tmp, 0, sizeof(tmp));
 364         tmp.line                = port->serial->minor;
 365         tmp.port                = 0;
 366         tmp.irq                 = 0;
 367         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 368         tmp.xmit_fifo_size      = port->bulk_out_size;
 369         tmp.baud_base           = 9600;
 370         tmp.close_delay         = 5*HZ;
 371         tmp.closing_wait        = 30*HZ;
 372
 373         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 374                 return -EFAULT;
 375         return 0;
 376 }
 377
 378 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 379 {
 380         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 381         struct async_icount prev, cur;
 382         unsigned long flags;
 383
 384         spin_lock_irqsave(&priv->status_lock, flags);
 385         prev = priv->icount;
 386         spin_unlock_irqrestore(&priv->status_lock, flags);
 387
 388         while (1) {
 389                 wait_event_interruptible(priv->delta_msr_wait,
 390                                          ((priv->icount.rng != prev.rng) ||
 391                                           (priv->icount.dsr != prev.dsr) ||
 392                                           (priv->icount.dcd != prev.dcd) ||
 393                                           (priv->icount.cts != prev.cts)));
 394
 395                 if (signal_pending(current))
 396                         return -ERESTARTSYS;
 397
 398                 spin_lock_irqsave(&priv->status_lock, flags);
 399                 cur = priv->icount;
 400                 spin_unlock_irqrestore(&priv->status_lock, flags);
 401
 402                 if ((prev.rng == cur.rng) &&
 403                     (prev.dsr == cur.dsr) &&
 404                     (prev.dcd == cur.dcd) &&
 405                     (prev.cts == cur.cts))
 406                         return -EIO;
 407
 408                 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
 409                     (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
 410                     (arg & TIOCM_CD  && (prev.dcd != cur.dcd)) ||
 411                     (arg & TIOCM_CTS && (prev.cts != cur.cts)))
 412                         return 0;
 413         }
 414         return 0;
 415 }
 416
 417 static int ssu100_get_icount(struct tty_struct *tty,
 418                         struct serial_icounter_struct *icount)
 419 {
 420         struct usb_serial_port *port = tty->driver_data;
 421         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 422         struct async_icount cnow = priv->icount;
 423
 424         icount->cts = cnow.cts;
 425         icount->dsr = cnow.dsr;
 426         icount->rng = cnow.rng;
 427         icount->dcd = cnow.dcd;
 428         icount->rx = cnow.rx;
 429         icount->tx = cnow.tx;
 430         icount->frame = cnow.frame;
 431         icount->overrun = cnow.overrun;
 432         icount->parity = cnow.parity;
 433         icount->brk = cnow.brk;
 434         icount->buf_overrun = cnow.buf_overrun;
 435
 436         return 0;
 437 }
 438
 439
 440
 441 static int ssu100_ioctl(struct tty_struct *tty,
 442                     unsigned int cmd, unsigned long arg)
 443 {
 444         struct usb_serial_port *port = tty->driver_data;
 445
 446         dbg("%s cmd 0x%04x", __func__, cmd);
 447
 448         switch (cmd) {
 449         case TIOCGSERIAL:
 450                 return get_serial_info(port,
 451                                        (struct serial_struct __user *) arg);
 452
 453         case TIOCMIWAIT:
 454                 return wait_modem_info(port, arg);
 455
 456         default:
 457                 break;
 458         }
 459
 460         dbg("%s arg not supported", __func__);
 461
 462         return -ENOIOCTLCMD;
 463 }
 464
 465 static int ssu100_attach(struct usb_serial *serial)
 466 {
 467         struct ssu100_port_private *priv;
 468         struct usb_serial_port *port = *serial->port;
 469
 470         dbg("%s", __func__);
 471
 472         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 473         if (!priv) {
 474                 dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
 475                         sizeof(*priv));
 476                 return -ENOMEM;
 477         }
 478
 479         spin_lock_init(&priv->status_lock);
 480         init_waitqueue_head(&priv->delta_msr_wait);
 481         usb_set_serial_port_data(port, priv);
 482
 483         return ssu100_initdevice(serial->dev);
 484 }
 485
 486 static int ssu100_tiocmget(struct tty_struct *tty)
 487 {
 488         struct usb_serial_port *port = tty->driver_data;
 489         struct usb_device *dev = port->serial->dev;
 490         u8 *d;
 491         int r;
 492
 493         dbg("%s\n", __func__);
 494
 495         d = kzalloc(2, GFP_KERNEL);
 496         if (!d)
 497                 return -ENOMEM;
 498
 499         r = ssu100_getregister(dev, 0, UART_MCR, d);
 500         if (r < 0)
 501                 goto mget_out;
 502
 503         r = ssu100_getregister(dev, 0, UART_MSR, d+1);
 504         if (r < 0)
 505                 goto mget_out;
 506
 507         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 508                 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 509                 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 510                 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 511                 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 512                 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 513
 514 mget_out:
 515         kfree(d);
 516         return r;
 517 }
 518
 519 static int ssu100_tiocmset(struct tty_struct *tty,
 520                            unsigned int set, unsigned int clear)
 521 {
 522         struct usb_serial_port *port = tty->driver_data;
 523         struct usb_device *dev = port->serial->dev;
 524
 525         dbg("%s\n", __func__);
 526         return update_mctrl(dev, set, clear);
 527 }
 528
 529 static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
 530 {
 531         struct usb_device *dev = port->serial->dev;
 532
 533         dbg("%s\n", __func__);
 534
 535         mutex_lock(&port->serial->disc_mutex);
 536         if (!port->serial->disconnected) {
 537                 /* Disable flow control */
 538                 if (!on &&
 539                     ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
 540                         dev_err(&port->dev, "error from flowcontrol urb\n");
 541                 /* drop RTS and DTR */
 542                 if (on)
 543                         set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 544                 else
 545                         clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 546         }
 547         mutex_unlock(&port->serial->disc_mutex);
 548 }
 549
 550 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
 551 {
 552         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 553         unsigned long flags;
 554
 555         spin_lock_irqsave(&priv->status_lock, flags);
 556         priv->shadowMSR = msr;
 557         spin_unlock_irqrestore(&priv->status_lock, flags);
 558
 559         if (msr & UART_MSR_ANY_DELTA) {
 560                 /* update input line counters */
 561                 if (msr & UART_MSR_DCTS)
 562                         priv->icount.cts++;
 563                 if (msr & UART_MSR_DDSR)
 564                         priv->icount.dsr++;
 565                 if (msr & UART_MSR_DDCD)
 566                         priv->icount.dcd++;
 567                 if (msr & UART_MSR_TERI)
 568                         priv->icount.rng++;
 569                 wake_up_interruptible(&priv->delta_msr_wait);
 570         }
 571 }
 572
 573 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
 574                               char *tty_flag)
 575 {
 576         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 577         unsigned long flags;
 578
 579         spin_lock_irqsave(&priv->status_lock, flags);
 580         priv->shadowLSR = lsr;
 581         spin_unlock_irqrestore(&priv->status_lock, flags);
 582
 583         *tty_flag = TTY_NORMAL;
 584         if (lsr & UART_LSR_BRK_ERROR_BITS) {
 585                 /* we always want to update icount, but we only want to
 586                  * update tty_flag for one case */
 587                 if (lsr & UART_LSR_BI) {
 588                         priv->icount.brk++;
 589                         *tty_flag = TTY_BREAK;
 590                         usb_serial_handle_break(port);
 591                 }
 592                 if (lsr & UART_LSR_PE) {
 593                         priv->icount.parity++;
 594                         if (*tty_flag == TTY_NORMAL)
 595                                 *tty_flag = TTY_PARITY;
 596                 }
 597                 if (lsr & UART_LSR_FE) {
 598                         priv->icount.frame++;
 599                         if (*tty_flag == TTY_NORMAL)
 600                                 *tty_flag = TTY_FRAME;
 601                 }
 602                 if (lsr & UART_LSR_OE){
 603                         priv->icount.overrun++;
 604                         if (*tty_flag == TTY_NORMAL)
 605                                 *tty_flag = TTY_OVERRUN;
 606                 }
 607         }
 608
 609 }
 610
 611 static int ssu100_process_packet(struct urb *urb,
 612                                  struct tty_struct *tty)
 613 {
 614         struct usb_serial_port *port = urb->context;
 615         char *packet = (char *)urb->transfer_buffer;
 616         char flag = TTY_NORMAL;
 617         u32 len = urb->actual_length;
 618         int i;
 619         char *ch;
 620
 621         dbg("%s - port %d", __func__, port->number);
 622
 623         if ((len >= 4) &&
 624             (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
 625             ((packet[2] == 0x00) || (packet[2] == 0x01))) {
 626                 if (packet[2] == 0x00) {
 627                         ssu100_update_lsr(port, packet[3], &flag);
 628                         if (flag == TTY_OVERRUN)
 629                                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
 630                 }
 631                 if (packet[2] == 0x01)
 632                         ssu100_update_msr(port, packet[3]);
 633
 634                 len -= 4;
 635                 ch = packet + 4;
 636         } else
 637                 ch = packet;
 638
 639         if (!len)
 640                 return 0;       /* status only */
 641
 642         if (port->port.console && port->sysrq) {
 643                 for (i = 0; i < len; i++, ch++) {
 644                         if (!usb_serial_handle_sysrq_char(port, *ch))
 645                                 tty_insert_flip_char(tty, *ch, flag);
 646                 }
 647         } else
 648                 tty_insert_flip_string_fixed_flag(tty, ch, flag, len);
 649
 650         return len;
 651 }
 652
 653 static void ssu100_process_read_urb(struct urb *urb)
 654 {
 655         struct usb_serial_port *port = urb->context;
 656         struct tty_struct *tty;
 657         int count;
 658
 659         dbg("%s", __func__);
 660
 661         tty = tty_port_tty_get(&port->port);
 662         if (!tty)
 663                 return;
 664
 665         count = ssu100_process_packet(urb, tty);
 666
 667         if (count)
 668                 tty_flip_buffer_push(tty);
 669         tty_kref_put(tty);
 670 }
 671
 672 static struct usb_serial_driver ssu100_device = {
 673         .driver = {
 674                 .owner = THIS_MODULE,
 675                 .name = "ssu100",
 676         },
 677         .description         = DRIVER_DESC,
 678         .id_table            = id_table,
 679         .num_ports           = 1,
 680         .open                = ssu100_open,
 681         .close               = ssu100_close,
 682         .attach              = ssu100_attach,
 683         .release             = ssu100_release,
 684         .dtr_rts             = ssu100_dtr_rts,
 685         .process_read_urb    = ssu100_process_read_urb,
 686         .tiocmget            = ssu100_tiocmget,
 687         .tiocmset            = ssu100_tiocmset,
 688         .get_icount          = ssu100_get_icount,
 689         .ioctl               = ssu100_ioctl,
 690         .set_termios         = ssu100_set_termios,
 691         .disconnect          = usb_serial_generic_disconnect,
 692 };
 693
 694 static struct usb_serial_driver * const serial_drivers[] = {
 695         &ssu100_device, NULL
 696 };
 697
 698 module_usb_serial_driver(ssu100_driver, serial_drivers);
 699
 700 MODULE_DESCRIPTION(DRIVER_DESC);
 701 MODULE_LICENSE("GPL");
 702
 703 module_param(debug, bool, S_IRUGO | S_IWUSR);
 704 MODULE_PARM_DESC(debug, "Debug enabled or not");