drivers/usb/serial/ssu100.c

   1 /*
   2  * usb-serial driver for Quatech SSU-100
   3  *
   4  * based on ftdi_sio.c and the original serqt_usb.c from Quatech
   5  *
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/init.h>
  10 #include <linux/slab.h>
  11 #include <linux/tty.h>
  12 #include <linux/tty_driver.h>
  13 #include <linux/tty_flip.h>
  14 #include <linux/module.h>
  15 #include <linux/serial.h>
  16 #include <linux/usb.h>
  17 #include <linux/usb/serial.h>
  18 #include <linux/serial_reg.h>
  19 #include <linux/uaccess.h>
  20
  21 #define QT_OPEN_CLOSE_CHANNEL       0xca
  22 #define QT_SET_GET_DEVICE           0xc2
  23 #define QT_SET_GET_REGISTER         0xc0
  24 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  25 #define QT_SET_ATF                  0xcd
  26 #define QT_GET_SET_UART             0xc1
  27 #define QT_TRANSFER_IN              0xc0
  28 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  29 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  30
  31 #define  SERIAL_MSR_MASK            0xf0
  32
  33 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
  34
  35 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
  36
  37 #define  MAX_BAUD_RATE              460800
  38
  39 #define ATC_DISABLED                0x00
  40 #define DUPMODE_BITS        0xc0
  41 #define RR_BITS             0x03
  42 #define LOOPMODE_BITS       0x41
  43 #define RS232_MODE          0x00
  44 #define RTSCTS_TO_CONNECTOR 0x40
  45 #define CLKS_X4             0x02
  46 #define FULLPWRBIT          0x00000080
  47 #define NEXT_BOARD_POWER_BIT        0x00000004
  48
  49 static int debug = 1;
  50
  51 /* Version Information */
  52 #define DRIVER_VERSION "v0.1"
  53 #define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"
  54
  55 #define USB_VENDOR_ID_QUATECH   0x061d  /* Quatech VID */
  56 #define QUATECH_SSU100  0xC020  /* SSU100 */
  57
  58 static const struct usb_device_id id_table[] = {
  59         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
  60         {}                      /* Terminating entry */
  61 };
  62
  63 MODULE_DEVICE_TABLE(usb, id_table);
  64
  65
  66 static struct usb_driver ssu100_driver = {
  67         .name                          = "ssu100",
  68         .probe                         = usb_serial_probe,
  69         .disconnect                    = usb_serial_disconnect,
  70         .id_table                      = id_table,
  71         .suspend                       = usb_serial_suspend,
  72         .resume                        = usb_serial_resume,
  73         .no_dynamic_id                 = 1,
  74         .supports_autosuspend          = 1,
  75 };
  76
  77 struct ssu100_port_private {
  78         spinlock_t status_lock;
  79         u8 shadowLSR;
  80         u8 shadowMSR;
  81         wait_queue_head_t delta_msr_wait; /* Used for TIOCMIWAIT */
  82         unsigned short max_packet_size;
  83         struct async_icount icount;
  84 };
  85
  86 static void ssu100_release(struct usb_serial *serial)
  87 {
  88         struct ssu100_port_private *priv = usb_get_serial_port_data(*serial->port);
  89
  90         dbg("%s", __func__);
  91         kfree(priv);
  92 }
  93
  94 static inline int ssu100_control_msg(struct usb_device *dev,
  95                                      u8 request, u16 data, u16 index)
  96 {
  97         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  98                                request, 0x40, data, index,
  99                                NULL, 0, 300);
 100 }
 101
 102 static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
 103 {
 104         u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));
 105
 106         return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
 107 }
 108
 109
 110 static inline int ssu100_getdevice(struct usb_device *dev, u8 *data)
 111 {
 112         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 113                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
 114                                data, 3, 300);
 115 }
 116
 117 static inline int ssu100_getregister(struct usb_device *dev,
 118                                      unsigned short uart,
 119                                      unsigned short reg,
 120                                      u8 *data)
 121 {
 122         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 123                                QT_SET_GET_REGISTER, 0xc0, reg,
 124                                uart, data, sizeof(*data), 300);
 125
 126 }
 127
 128
 129 static inline int ssu100_setregister(struct usb_device *dev,
 130                                      unsigned short uart,
 131                                      unsigned short reg,
 132                                      u16 data)
 133 {
 134         u16 value = (data << 8) | reg;
 135
 136         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 137                                QT_SET_GET_REGISTER, 0x40, value, uart,
 138                                NULL, 0, 300);
 139
 140 }
 141
 142 #define set_mctrl(dev, set)             update_mctrl((dev), (set), 0)
 143 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
 144
 145 /* these do not deal with device that have more than 1 port */
 146 static inline int update_mctrl(struct usb_device *dev, unsigned int set,
 147                                unsigned int clear)
 148 {
 149         unsigned urb_value;
 150         int result;
 151
 152         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 153                 dbg("%s - DTR|RTS not being set|cleared", __func__);
 154                 return 0;       /* no change */
 155         }
 156
 157         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 158         urb_value = 0;
 159         if (set & TIOCM_DTR)
 160                 urb_value |= UART_MCR_DTR;
 161         if (set & TIOCM_RTS)
 162                 urb_value |= UART_MCR_RTS;
 163
 164         result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
 165         if (result < 0)
 166                 dbg("%s Error from MODEM_CTRL urb", __func__);
 167
 168         return result;
 169 }
 170
 171 static int ssu100_initdevice(struct usb_device *dev)
 172 {
 173         u8 *data;
 174         int result = 0;
 175
 176         dbg("%s", __func__);
 177
 178         data = kzalloc(3, GFP_KERNEL);
 179         if (!data)
 180                 return -ENOMEM;
 181
 182         result = ssu100_getdevice(dev, data);
 183         if (result < 0) {
 184                 dbg("%s - get_device failed %i", __func__, result);
 185                 goto out;
 186         }
 187
 188         data[1] &= ~FULLPWRBIT;
 189
 190         result = ssu100_setdevice(dev, data);
 191         if (result < 0) {
 192                 dbg("%s - setdevice failed %i", __func__, result);
 193                 goto out;
 194         }
 195
 196         result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
 197         if (result < 0) {
 198                 dbg("%s - set prebuffer level failed %i", __func__, result);
 199                 goto out;
 200         }
 201
 202         result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
 203         if (result < 0) {
 204                 dbg("%s - set ATFprebuffer level failed %i", __func__, result);
 205                 goto out;
 206         }
 207
 208         result = ssu100_getdevice(dev, data);
 209         if (result < 0) {
 210                 dbg("%s - get_device failed %i", __func__, result);
 211                 goto out;
 212         }
 213
 214         data[0] &= ~(RR_BITS | DUPMODE_BITS);
 215         data[0] |= CLKS_X4;
 216         data[1] &= ~(LOOPMODE_BITS);
 217         data[1] |= RS232_MODE;
 218
 219         result = ssu100_setdevice(dev, data);
 220         if (result < 0) {
 221                 dbg("%s - setdevice failed %i", __func__, result);
 222                 goto out;
 223         }
 224
 225 out:    kfree(data);
 226         return result;
 227
 228 }
 229
 230
 231 static void ssu100_set_termios(struct tty_struct *tty,
 232                                struct usb_serial_port *port,
 233                                struct ktermios *old_termios)
 234 {
 235         struct usb_device *dev = port->serial->dev;
 236         struct ktermios *termios = tty->termios;
 237         u16 baud, divisor, remainder;
 238         unsigned int cflag = termios->c_cflag;
 239         u16 urb_value = 0; /* will hold the new flags */
 240         int result;
 241
 242         dbg("%s", __func__);
 243
 244         if (cflag & PARENB) {
 245                 if (cflag & PARODD)
 246                         urb_value |= UART_LCR_PARITY;
 247                 else
 248                         urb_value |= SERIAL_EVEN_PARITY;
 249         }
 250
 251         switch (cflag & CSIZE) {
 252         case CS5:
 253                 urb_value |= UART_LCR_WLEN5;
 254                 break;
 255         case CS6:
 256                 urb_value |= UART_LCR_WLEN6;
 257                 break;
 258         case CS7:
 259                 urb_value |= UART_LCR_WLEN7;
 260                 break;
 261         default:
 262         case CS8:
 263                 urb_value |= UART_LCR_WLEN8;
 264                 break;
 265         }
 266
 267         baud = tty_get_baud_rate(tty);
 268         if (!baud)
 269                 baud = 9600;
 270
 271         dbg("%s - got baud = %d\n", __func__, baud);
 272
 273
 274         divisor = MAX_BAUD_RATE / baud;
 275         remainder = MAX_BAUD_RATE % baud;
 276         if (((remainder * 2) >= baud) && (baud != 110))
 277                 divisor++;
 278
 279         urb_value = urb_value << 8;
 280
 281         result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
 282         if (result < 0)
 283                 dbg("%s - set uart failed", __func__);
 284
 285         if (cflag & CRTSCTS)
 286                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 287                                             SERIAL_CRTSCTS, 0);
 288         else
 289                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 290                                             0, 0);
 291         if (result < 0)
 292                 dbg("%s - set HW flow control failed", __func__);
 293
 294         if (I_IXOFF(tty) || I_IXON(tty)) {
 295                 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));
 296
 297                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 298                                             x, 0);
 299         } else
 300                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 301                                             0, 0);
 302
 303         if (result < 0)
 304                 dbg("%s - set SW flow control failed", __func__);
 305
 306 }
 307
 308
 309 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
 310 {
 311         struct usb_device *dev = port->serial->dev;
 312         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 313         u8 *data;
 314         int result;
 315         unsigned long flags;
 316
 317         dbg("%s - port %d", __func__, port->number);
 318
 319         data = kzalloc(2, GFP_KERNEL);
 320         if (!data)
 321                 return -ENOMEM;
 322
 323         result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 324                                  QT_OPEN_CLOSE_CHANNEL,
 325                                  QT_TRANSFER_IN, 0x01,
 326                                  0, data, 2, 300);
 327         if (result < 0) {
 328                 dbg("%s - open failed %i", __func__, result);
 329                 kfree(data);
 330                 return result;
 331         }
 332
 333         spin_lock_irqsave(&priv->status_lock, flags);
 334         priv->shadowLSR = data[0];
 335         priv->shadowMSR = data[1];
 336         spin_unlock_irqrestore(&priv->status_lock, flags);
 337
 338         kfree(data);
 339
 340 /* set to 9600 */
 341         result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
 342         if (result < 0)
 343                 dbg("%s - set uart failed", __func__);
 344
 345         if (tty)
 346                 ssu100_set_termios(tty, port, tty->termios);
 347
 348         return usb_serial_generic_open(tty, port);
 349 }
 350
 351 static void ssu100_close(struct usb_serial_port *port)
 352 {
 353         dbg("%s", __func__);
 354         usb_serial_generic_close(port);
 355 }
 356
 357 static int get_serial_info(struct usb_serial_port *port,
 358                            struct serial_struct __user *retinfo)
 359 {
 360         struct serial_struct tmp;
 361
 362         if (!retinfo)
 363                 return -EFAULT;
 364
 365         memset(&tmp, 0, sizeof(tmp));
 366         tmp.line                = port->serial->minor;
 367         tmp.port                = 0;
 368         tmp.irq                 = 0;
 369         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 370         tmp.xmit_fifo_size      = port->bulk_out_size;
 371         tmp.baud_base           = 9600;
 372         tmp.close_delay         = 5*HZ;
 373         tmp.closing_wait        = 30*HZ;
 374
 375         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 376                 return -EFAULT;
 377         return 0;
 378 }
 379
 380 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 381 {
 382         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 383         struct async_icount prev, cur;
 384         unsigned long flags;
 385
 386         spin_lock_irqsave(&priv->status_lock, flags);
 387         prev = priv->icount;
 388         spin_unlock_irqrestore(&priv->status_lock, flags);
 389
 390         while (1) {
 391                 wait_event_interruptible(priv->delta_msr_wait,
 392                                          ((priv->icount.rng != prev.rng) ||
 393                                           (priv->icount.dsr != prev.dsr) ||
 394                                           (priv->icount.dcd != prev.dcd) ||
 395                                           (priv->icount.cts != prev.cts)));
 396
 397                 if (signal_pending(current))
 398                         return -ERESTARTSYS;
 399
 400                 spin_lock_irqsave(&priv->status_lock, flags);
 401                 cur = priv->icount;
 402                 spin_unlock_irqrestore(&priv->status_lock, flags);
 403
 404                 if ((prev.rng == cur.rng) &&
 405                     (prev.dsr == cur.dsr) &&
 406                     (prev.dcd == cur.dcd) &&
 407                     (prev.cts == cur.cts))
 408                         return -EIO;
 409
 410                 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
 411                     (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
 412                     (arg & TIOCM_CD  && (prev.dcd != cur.dcd)) ||
 413                     (arg & TIOCM_CTS && (prev.cts != cur.cts)))
 414                         return 0;
 415         }
 416         return 0;
 417 }
 418
 419 static int ssu100_ioctl(struct tty_struct *tty, struct file *file,
 420                     unsigned int cmd, unsigned long arg)
 421 {
 422         struct usb_serial_port *port = tty->driver_data;
 423         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 424         void __user *user_arg = (void __user *)arg;
 425
 426         dbg("%s cmd 0x%04x", __func__, cmd);
 427
 428         switch (cmd) {
 429         case TIOCGSERIAL:
 430                 return get_serial_info(port,
 431                                        (struct serial_struct __user *) arg);
 432
 433         case TIOCMIWAIT:
 434                 return wait_modem_info(port, arg);
 435
 436         case TIOCGICOUNT:
 437         {
 438                 struct serial_icounter_struct icount;
 439                 struct async_icount cnow = priv->icount;
 440                 memset(&icount, 0, sizeof(icount));
 441                 icount.cts = cnow.cts;
 442                 icount.dsr = cnow.dsr;
 443                 icount.rng = cnow.rng;
 444                 icount.dcd = cnow.dcd;
 445                 icount.rx = cnow.rx;
 446                 icount.tx = cnow.tx;
 447                 icount.frame = cnow.frame;
 448                 icount.overrun = cnow.overrun;
 449                 icount.parity = cnow.parity;
 450                 icount.brk = cnow.brk;
 451                 icount.buf_overrun = cnow.buf_overrun;
 452                 if (copy_to_user(user_arg, &icount, sizeof(icount)))
 453                         return -EFAULT;
 454                 return 0;
 455         }
 456
 457         default:
 458                 break;
 459         }
 460
 461         dbg("%s arg not supported", __func__);
 462
 463         return -ENOIOCTLCMD;
 464 }
 465
 466 static void ssu100_set_max_packet_size(struct usb_serial_port *port)
 467 {
 468         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 469         struct usb_serial *serial = port->serial;
 470         struct usb_device *udev = serial->dev;
 471
 472         struct usb_interface *interface = serial->interface;
 473         struct usb_endpoint_descriptor *ep_desc = &interface->cur_altsetting->endpoint[1].desc;
 474
 475         unsigned num_endpoints;
 476         int i;
 477         unsigned long flags;
 478
 479         num_endpoints = interface->cur_altsetting->desc.bNumEndpoints;
 480         dev_info(&udev->dev, "Number of endpoints %d\n", num_endpoints);
 481
 482         for (i = 0; i < num_endpoints; i++) {
 483                 dev_info(&udev->dev, "Endpoint %d MaxPacketSize %d\n", i+1,
 484                         interface->cur_altsetting->endpoint[i].desc.wMaxPacketSize);
 485                 ep_desc = &interface->cur_altsetting->endpoint[i].desc;
 486         }
 487
 488         /* set max packet size based on descriptor */
 489         spin_lock_irqsave(&priv->status_lock, flags);
 490         priv->max_packet_size = ep_desc->wMaxPacketSize;
 491         spin_unlock_irqrestore(&priv->status_lock, flags);
 492
 493         dev_info(&udev->dev, "Setting MaxPacketSize %d\n", priv->max_packet_size);
 494 }
 495
 496 static int ssu100_attach(struct usb_serial *serial)
 497 {
 498         struct ssu100_port_private *priv;
 499         struct usb_serial_port *port = *serial->port;
 500
 501         dbg("%s", __func__);
 502
 503         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 504         if (!priv) {
 505                 dev_err(&port->dev, "%s- kmalloc(%Zd) failed.\n", __func__,
 506                         sizeof(*priv));
 507                 return -ENOMEM;
 508         }
 509
 510         spin_lock_init(&priv->status_lock);
 511         init_waitqueue_head(&priv->delta_msr_wait);
 512         usb_set_serial_port_data(port, priv);
 513         ssu100_set_max_packet_size(port);
 514
 515         return ssu100_initdevice(serial->dev);
 516 }
 517
 518 static int ssu100_tiocmget(struct tty_struct *tty, struct file *file)
 519 {
 520         struct usb_serial_port *port = tty->driver_data;
 521         struct usb_device *dev = port->serial->dev;
 522         u8 *d;
 523         int r;
 524
 525         dbg("%s\n", __func__);
 526
 527         d = kzalloc(2, GFP_KERNEL);
 528         if (!d)
 529                 return -ENOMEM;
 530
 531         r = ssu100_getregister(dev, 0, UART_MCR, d);
 532         if (r < 0)
 533                 goto mget_out;
 534
 535         r = ssu100_getregister(dev, 0, UART_MSR, d+1);
 536         if (r < 0)
 537                 goto mget_out;
 538
 539         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 540                 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 541                 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 542                 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 543                 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 544                 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 545
 546 mget_out:
 547         kfree(d);
 548         return r;
 549 }
 550
 551 static int ssu100_tiocmset(struct tty_struct *tty, struct file *file,
 552                            unsigned int set, unsigned int clear)
 553 {
 554         struct usb_serial_port *port = tty->driver_data;
 555         struct usb_device *dev = port->serial->dev;
 556
 557         dbg("%s\n", __func__);
 558         return update_mctrl(dev, set, clear);
 559 }
 560
 561 static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
 562 {
 563         struct usb_device *dev = port->serial->dev;
 564
 565         dbg("%s\n", __func__);
 566
 567         mutex_lock(&port->serial->disc_mutex);
 568         if (!port->serial->disconnected) {
 569                 /* Disable flow control */
 570                 if (!on &&
 571                     ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
 572                         dev_err(&port->dev, "error from flowcontrol urb\n");
 573                 /* drop RTS and DTR */
 574                 if (on)
 575                         set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 576                 else
 577                         clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 578         }
 579         mutex_unlock(&port->serial->disc_mutex);
 580 }
 581
 582 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
 583 {
 584         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 585         unsigned long flags;
 586
 587         spin_lock_irqsave(&priv->status_lock, flags);
 588         priv->shadowMSR = msr;
 589         spin_unlock_irqrestore(&priv->status_lock, flags);
 590
 591         if (msr & UART_MSR_ANY_DELTA) {
 592                 /* update input line counters */
 593                 if (msr & UART_MSR_DCTS)
 594                         priv->icount.cts++;
 595                 if (msr & UART_MSR_DDSR)
 596                         priv->icount.dsr++;
 597                 if (msr & UART_MSR_DDCD)
 598                         priv->icount.dcd++;
 599                 if (msr & UART_MSR_TERI)
 600                         priv->icount.rng++;
 601                 wake_up_interruptible(&priv->delta_msr_wait);
 602         }
 603 }
 604
 605 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr)
 606 {
 607         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 608         unsigned long flags;
 609
 610         spin_lock_irqsave(&priv->status_lock, flags);
 611         priv->shadowLSR = lsr;
 612         spin_unlock_irqrestore(&priv->status_lock, flags);
 613
 614         if (lsr & UART_LSR_BRK_ERROR_BITS) {
 615                 if (lsr & UART_LSR_BI)
 616                         priv->icount.brk++;
 617                 if (lsr & UART_LSR_FE)
 618                         priv->icount.frame++;
 619                 if (lsr & UART_LSR_PE)
 620                         priv->icount.parity++;
 621                 if (lsr & UART_LSR_OE)
 622                         priv->icount.overrun++;
 623         }
 624 }
 625
 626 static int ssu100_process_packet(struct tty_struct *tty,
 627                                  struct usb_serial_port *port,
 628                                  struct ssu100_port_private *priv,
 629                                  char *packet, int len)
 630 {
 631         int i;
 632         char flag;
 633         char *ch;
 634
 635         dbg("%s - port %d", __func__, port->number);
 636
 637         if ((len >= 4) &&
 638             (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
 639             ((packet[2] == 0x00) || (packet[2] == 0x01))) {
 640                 if (packet[2] == 0x00)
 641                         ssu100_update_lsr(port, packet[3]);
 642                 if (packet[2] == 0x01)
 643                         ssu100_update_msr(port, packet[3]);
 644
 645                 len -= 4;
 646                 ch = packet + 4;
 647         } else
 648                 ch = packet;
 649
 650         if (!len)
 651                 return 0;       /* status only */
 652
 653         if (port->port.console && port->sysrq) {
 654                 for (i = 0; i < len; i++, ch++) {
 655                         if (!usb_serial_handle_sysrq_char(tty, port, *ch))
 656                                 tty_insert_flip_char(tty, *ch, flag);
 657                 }
 658         } else
 659                 tty_insert_flip_string_fixed_flag(tty, ch, flag, len);
 660
 661         return len;
 662 }
 663
 664 static void ssu100_process_read_urb(struct urb *urb)
 665 {
 666         struct usb_serial_port *port = urb->context;
 667         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 668         char *data = (char *)urb->transfer_buffer;
 669         struct tty_struct *tty;
 670         int count = 0;
 671         int i;
 672         int len;
 673
 674         dbg("%s", __func__);
 675
 676         tty = tty_port_tty_get(&port->port);
 677         if (!tty)
 678                 return;
 679
 680         for (i = 0; i < urb->actual_length; i += priv->max_packet_size) {
 681                 len = min_t(int, urb->actual_length - i, priv->max_packet_size);
 682                 count += ssu100_process_packet(tty, port, priv, &data[i], len);
 683         }
 684
 685         if (count)
 686                 tty_flip_buffer_push(tty);
 687         tty_kref_put(tty);
 688 }
 689
 690
 691 static struct usb_serial_driver ssu100_device = {
 692         .driver = {
 693                 .owner = THIS_MODULE,
 694                 .name = "ssu100",
 695         },
 696         .description         = DRIVER_DESC,
 697         .id_table            = id_table,
 698         .usb_driver          = &ssu100_driver,
 699         .num_ports           = 1,
 700         .bulk_in_size        = 256,
 701         .bulk_out_size       = 256,
 702         .open                = ssu100_open,
 703         .close               = ssu100_close,
 704         .attach              = ssu100_attach,
 705         .release             = ssu100_release,
 706         .dtr_rts             = ssu100_dtr_rts,
 707         .process_read_urb    = ssu100_process_read_urb,
 708         .tiocmget            = ssu100_tiocmget,
 709         .tiocmset            = ssu100_tiocmset,
 710         .ioctl               = ssu100_ioctl,
 711         .set_termios         = ssu100_set_termios,
 712 };
 713
 714 static int __init ssu100_init(void)
 715 {
 716         int retval;
 717
 718         dbg("%s", __func__);
 719
 720         /* register with usb-serial */
 721         retval = usb_serial_register(&ssu100_device);
 722
 723         if (retval)
 724                 goto failed_usb_sio_register;
 725
 726         retval = usb_register(&ssu100_driver);
 727         if (retval)
 728                 goto failed_usb_register;
 729
 730         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 731                DRIVER_DESC "\n");
 732
 733         return 0;
 734
 735 failed_usb_register:
 736         usb_serial_deregister(&ssu100_device);
 737 failed_usb_sio_register:
 738         return retval;
 739 }
 740
 741 static void __exit ssu100_exit(void)
 742 {
 743         usb_deregister(&ssu100_driver);
 744         usb_serial_deregister(&ssu100_device);
 745 }
 746
 747 module_init(ssu100_init);
 748 module_exit(ssu100_exit);
 749
 750 MODULE_DESCRIPTION(DRIVER_DESC);
 751 MODULE_LICENSE("GPL");
 752
 753 module_param(debug, bool, S_IRUGO | S_IWUSR);
 754 MODULE_PARM_DESC(debug, "Debug enabled or not");