drivers/staging/serqt_usb2/serqt_usb2.c

   1 /*
   2  * This code was developed for the Quatech USB line for linux, it used
   3  * much of the code developed by Greg Kroah-Hartman for USB serial devices
   4  *
   5  */
   6
   7 #include <linux/errno.h>
   8 #include <linux/init.h>
   9 #include <linux/slab.h>
  10 #include <linux/tty.h>
  11 #include <linux/tty_driver.h>
  12 #include <linux/tty_flip.h>
  13 #include <linux/module.h>
  14 #include <linux/serial.h>
  15 #include <linux/usb.h>
  16 #include <linux/usb/serial.h>
  17 #include <linux/uaccess.h>
  18
  19 /* Version Information */
  20 #define DRIVER_VERSION "v2.14"
  21 #define DRIVER_AUTHOR "Tim Gobeli, Quatech, Inc"
  22 #define DRIVER_DESC "Quatech USB to Serial Driver"
  23
  24 #define USB_VENDOR_ID_QUATECH                   0x061d  /* Quatech VID */
  25 #define QUATECH_SSU200  0xC030  /* SSU200 */
  26 #define QUATECH_DSU100  0xC040  /* DSU100 */
  27 #define QUATECH_DSU200  0xC050  /* DSU200 */
  28 #define QUATECH_QSU100  0xC060  /* QSU100 */
  29 #define QUATECH_QSU200  0xC070  /* QSU200 */
  30 #define QUATECH_ESU100A 0xC080  /* ESU100A */
  31 #define QUATECH_ESU100B 0xC081  /* ESU100B */
  32 #define QUATECH_ESU200A 0xC0A0  /* ESU200A */
  33 #define QUATECH_ESU200B 0xC0A1  /* ESU200B */
  34 #define QUATECH_HSU100A 0xC090  /* HSU100A */
  35 #define QUATECH_HSU100B 0xC091  /* HSU100B */
  36 #define QUATECH_HSU100C 0xC092  /* HSU100C */
  37 #define QUATECH_HSU100D 0xC093  /* HSU100D */
  38 #define QUATECH_HSU200A 0xC0B0  /* HSU200A */
  39 #define QUATECH_HSU200B 0xC0B1  /* HSU200B */
  40 #define QUATECH_HSU200C 0xC0B2  /* HSU200C */
  41 #define QUATECH_HSU200D 0xC0B3  /* HSU200D */
  42
  43 #define QT_SET_GET_DEVICE           0xc2
  44 #define QT_OPEN_CLOSE_CHANNEL       0xca
  45 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  46 #define QT_SET_ATF                  0xcd
  47 #define QT_GET_SET_REGISTER         0xc0
  48 #define QT_GET_SET_UART             0xc1
  49 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  50 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  51 #define QT_SW_FLOW_CONTROL_DISABLE  0xc7
  52 #define QT_BREAK_CONTROL            0xc8
  53
  54 #define USBD_TRANSFER_DIRECTION_IN    0xc0
  55 #define USBD_TRANSFER_DIRECTION_OUT   0x40
  56
  57 #define  MAX_BAUD_RATE              460800
  58 #define  MAX_BAUD_REMAINDER         4608
  59
  60 #define  DIV_LATCH_LS               0x00
  61 #define  XMT_HOLD_REGISTER          0x00
  62 #define  XVR_BUFFER_REGISTER        0x00
  63 #define  DIV_LATCH_MS               0x01
  64 #define  FIFO_CONTROL_REGISTER      0x02
  65 #define  LINE_CONTROL_REGISTER      0x03
  66 #define  MODEM_CONTROL_REGISTER     0x04
  67 #define  LINE_STATUS_REGISTER       0x05
  68 #define  MODEM_STATUS_REGISTER      0x06
  69
  70 #define  SERIAL_MCR_DTR             0x01
  71 #define  SERIAL_MCR_RTS             0x02
  72 #define  SERIAL_MCR_LOOP            0x10
  73
  74 #define  SERIAL_MSR_CTS             0x10
  75 #define  SERIAL_MSR_CD              0x80
  76 #define  SERIAL_MSR_RI              0x40
  77 #define  SERIAL_MSR_DSR             0x20
  78 #define  SERIAL_MSR_MASK            0xf0
  79
  80 #define  SERIAL_8_DATA              0x03
  81 #define  SERIAL_7_DATA              0x02
  82 #define  SERIAL_6_DATA              0x01
  83 #define  SERIAL_5_DATA              0x00
  84
  85 #define  SERIAL_ODD_PARITY          0X08
  86 #define  SERIAL_EVEN_PARITY         0X18
  87 #define  SERIAL_TWO_STOPB           0x04
  88 #define  SERIAL_ONE_STOPB           0x00
  89
  90 #define DEFAULT_DIVISOR  0x30   /* gives 9600 baud rate */
  91 #define DEFAULT_LCR SERIAL_8_DATA       /* 8, none , 1 */
  92
  93 #define FULLPWRBIT          0x00000080
  94 #define NEXT_BOARD_POWER_BIT        0x00000004
  95
  96 #define SERIAL_LSR_OE       0x02
  97 #define SERIAL_LSR_PE       0x04
  98 #define SERIAL_LSR_FE       0x08
  99 #define SERIAL_LSR_BI       0x10
 100
 101 #define  SERIAL_MSR_CTS             0x10
 102 #define  SERIAL_MSR_CD              0x80
 103 #define  SERIAL_MSR_RI              0x40
 104 #define  SERIAL_MSR_DSR             0x20
 105 #define  SERIAL_MSR_MASK            0xf0
 106
 107 #define PREFUFF_LEVEL_CONSERVATIVE  128
 108 #define ATC_DISABLED                0x0
 109
 110 #define RR_BITS             0x03        /* for clearing clock bits */
 111 #define DUPMODE_BITS        0xc0
 112 #define CLKS_X4             0x02
 113
 114 #define LOOPMODE_BITS       0x41        /* LOOP1 = b6, LOOP0 = b0 (PORT B) */
 115 #define ALL_LOOPBACK        0x01
 116 #define MODEM_CTRL          0x40
 117 #define RS232_MODE          0x00
 118
 119 static const struct usb_device_id id_table[] = {
 120         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU200)},
 121         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU100)},
 122         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU200)},
 123         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU100)},
 124         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU200)},
 125         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU100A)},
 126         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU100B)},
 127         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU200A)},
 128         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU200B)},
 129         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU100A)},
 130         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU100B)},
 131         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU100C)},
 132         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU100D)},
 133         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU200A)},
 134         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU200B)},
 135         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU200C)},
 136         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_HSU200D)},
 137         {}                      /* Terminating entry */
 138 };
 139 MODULE_DEVICE_TABLE(usb, id_table);
 140
 141 struct qt_get_device_data {
 142         __u8 porta;
 143         __u8 portb;
 144         __u8 portc;
 145 };
 146
 147 struct qt_open_channel_data {
 148         __u8 line_status;
 149         __u8 modem_status;
 150 };
 151
 152 struct quatech_port {
 153         int port_num;           /* number of the port */
 154         struct urb *write_urb;  /* write URB for this port */
 155         struct urb *read_urb;   /* read URB for this port */
 156         struct urb *int_urb;
 157
 158         __u8 shadowLCR;         /* last LCR value received */
 159         __u8 shadowMCR;         /* last MCR value received */
 160         __u8 shadowMSR;         /* last MSR value received */
 161         __u8 shadowLSR;         /* last LSR value received */
 162         char open_ports;
 163
 164         /* Used for TIOCMIWAIT */
 165         wait_queue_head_t msr_wait;
 166         char prev_status, diff_status;
 167
 168         wait_queue_head_t wait;
 169
 170         struct async_icount icount;
 171
 172         struct usb_serial_port *port;   /* owner of this object */
 173         struct qt_get_device_data DeviceData;
 174         struct mutex lock;
 175         bool read_urb_busy;
 176         int RxHolding;
 177         int ReadBulkStopped;
 178         char closePending;
 179 };
 180
 181 static int port_paranoia_check(struct usb_serial_port *port,
 182                                const char *function)
 183 {
 184         if (!port) {
 185                 pr_debug("%s - port == NULL", function);
 186                 return -1;
 187         }
 188         if (!port->serial) {
 189                 pr_debug("%s - port->serial == NULL\n", function);
 190                 return -1;
 191         }
 192
 193         return 0;
 194 }
 195
 196 static int serial_paranoia_check(struct usb_serial *serial,
 197                                  const char *function)
 198 {
 199         if (!serial) {
 200                 pr_debug("%s - serial == NULL\n", function);
 201                 return -1;
 202         }
 203
 204         if (!serial->type) {
 205                 pr_debug("%s - serial->type == NULL!", function);
 206                 return -1;
 207         }
 208
 209         return 0;
 210 }
 211
 212 static inline struct quatech_port *qt_get_port_private(struct usb_serial_port
 213                                                        *port)
 214 {
 215         return (struct quatech_port *)usb_get_serial_port_data(port);
 216 }
 217
 218 static inline void qt_set_port_private(struct usb_serial_port *port,
 219                                        struct quatech_port *data)
 220 {
 221         usb_set_serial_port_data(port, (void *)data);
 222 }
 223
 224 static struct usb_serial *get_usb_serial(struct usb_serial_port *port,
 225                                          const char *function)
 226 {
 227         /* if no port was specified, or it fails a paranoia check */
 228         if (!port ||
 229             port_paranoia_check(port, function) ||
 230             serial_paranoia_check(port->serial, function)) {
 231                 /*
 232                  * then say that we dont have a valid usb_serial thing,
 233                  * which will end up genrating -ENODEV return values
 234                  */
 235                 return NULL;
 236         }
 237
 238         return port->serial;
 239 }
 240
 241 static void ProcessLineStatus(struct quatech_port *qt_port,
 242                               unsigned char line_status)
 243 {
 244
 245         qt_port->shadowLSR =
 246             line_status & (SERIAL_LSR_OE | SERIAL_LSR_PE | SERIAL_LSR_FE |
 247                            SERIAL_LSR_BI);
 248 }
 249
 250 static void ProcessModemStatus(struct quatech_port *qt_port,
 251                                unsigned char modem_status)
 252 {
 253
 254         qt_port->shadowMSR = modem_status;
 255         wake_up_interruptible(&qt_port->wait);
 256 }
 257
 258 static void ProcessRxChar(struct usb_serial_port *port, unsigned char data)
 259 {
 260         struct urb *urb = port->read_urb;
 261         if (urb->actual_length)
 262                 tty_insert_flip_char(&port->port, data, TTY_NORMAL);
 263 }
 264
 265 static void qt_write_bulk_callback(struct urb *urb)
 266 {
 267         struct tty_struct *tty;
 268         int status;
 269         struct quatech_port *quatech_port;
 270
 271         status = urb->status;
 272
 273         if (status) {
 274                 dev_dbg(&urb->dev->dev,
 275                         "nonzero write bulk status received:%d\n", status);
 276                 return;
 277         }
 278
 279         quatech_port = urb->context;
 280
 281         tty = tty_port_tty_get(&quatech_port->port->port);
 282
 283         if (tty)
 284                 tty_wakeup(tty);
 285         tty_kref_put(tty);
 286 }
 287
 288 static void qt_interrupt_callback(struct urb *urb)
 289 {
 290         /* FIXME */
 291 }
 292
 293 static void qt_status_change_check(struct tty_struct *tty,
 294                                    struct urb *urb,
 295                                    struct quatech_port *qt_port,
 296                                    struct usb_serial_port *port)
 297 {
 298         int flag, i;
 299         unsigned char *data = urb->transfer_buffer;
 300         unsigned int RxCount = urb->actual_length;
 301
 302         for (i = 0; i < RxCount; ++i) {
 303                 /* Look ahead code here */
 304                 if ((i <= (RxCount - 3)) && (data[i] == 0x1b)
 305                     && (data[i + 1] == 0x1b)) {
 306                         flag = 0;
 307                         switch (data[i + 2]) {
 308                         case 0x00:
 309                                 if (i > (RxCount - 4)) {
 310                                         dev_dbg(&port->dev,
 311                                                 "Illegal escape seuences in received data\n");
 312                                         break;
 313                                 }
 314
 315                                 ProcessLineStatus(qt_port, data[i + 3]);
 316
 317                                 i += 3;
 318                                 flag = 1;
 319                                 break;
 320
 321                         case 0x01:
 322                                 if (i > (RxCount - 4)) {
 323                                         dev_dbg(&port->dev,
 324                                                 "Illegal escape seuences in received data\n");
 325                                         break;
 326                                 }
 327
 328                                 ProcessModemStatus(qt_port, data[i + 3]);
 329
 330                                 i += 3;
 331                                 flag = 1;
 332                                 break;
 333
 334                         case 0xff:
 335                                 dev_dbg(&port->dev, "No status sequence.\n");
 336
 337                                 ProcessRxChar(port, data[i]);
 338                                 ProcessRxChar(port, data[i + 1]);
 339
 340                                 i += 2;
 341                                 break;
 342                         }
 343                         if (flag == 1)
 344                                 continue;
 345                 }
 346
 347                 if (urb->actual_length)
 348                         tty_insert_flip_char(&port->port, data[i], TTY_NORMAL);
 349
 350         }
 351         tty_flip_buffer_push(tty);
 352 }
 353
 354 static void qt_read_bulk_callback(struct urb *urb)
 355 {
 356
 357         struct usb_serial_port *port = urb->context;
 358         struct usb_serial *serial = get_usb_serial(port, __func__);
 359         struct quatech_port *qt_port = qt_get_port_private(port);
 360         struct tty_struct *tty;
 361         int result;
 362
 363         if (urb->status) {
 364                 qt_port->ReadBulkStopped = 1;
 365                 dev_dbg(&urb->dev->dev,
 366                         "%s - nonzero write bulk status received: %d\n",
 367                         __func__, urb->status);
 368                 return;
 369         }
 370
 371         tty = tty_port_tty_get(&port->port);
 372         if (!tty)
 373                 return;
 374
 375         dev_dbg(&port->dev,
 376                 "%s - port->RxHolding = %d\n", __func__, qt_port->RxHolding);
 377
 378         if (port_paranoia_check(port, __func__) != 0) {
 379                 qt_port->ReadBulkStopped = 1;
 380                 goto exit;
 381         }
 382
 383         if (!serial)
 384                 goto exit;
 385
 386         if (qt_port->closePending == 1) {
 387                 /* Were closing , stop reading */
 388                 dev_dbg(&port->dev,
 389                         "%s - (qt_port->closepending == 1\n", __func__);
 390                 qt_port->ReadBulkStopped = 1;
 391                 goto exit;
 392         }
 393
 394         /*
 395          * RxHolding is asserted by throttle, if we assert it, we're not
 396          * receiving any more characters and let the box handle the flow
 397          * control
 398          */
 399         if (qt_port->RxHolding == 1) {
 400                 qt_port->ReadBulkStopped = 1;
 401                 goto exit;
 402         }
 403
 404         if (urb->status) {
 405                 qt_port->ReadBulkStopped = 1;
 406
 407                 dev_dbg(&port->dev,
 408                         "%s - nonzero read bulk status received: %d\n",
 409                         __func__, urb->status);
 410                 goto exit;
 411         }
 412
 413         if (urb->actual_length)
 414                 qt_status_change_check(tty, urb, qt_port, port);
 415
 416         /* Continue trying to always read  */
 417         usb_fill_bulk_urb(port->read_urb, serial->dev,
 418                           usb_rcvbulkpipe(serial->dev,
 419                                           port->bulk_in_endpointAddress),
 420                           port->read_urb->transfer_buffer,
 421                           port->read_urb->transfer_buffer_length,
 422                           qt_read_bulk_callback, port);
 423         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 424         if (result)
 425                 dev_dbg(&port->dev,
 426                         "%s - failed resubmitting read urb, error %d",
 427                         __func__, result);
 428         else {
 429                 if (urb->actual_length) {
 430                         tty_flip_buffer_push(tty);
 431                         tty_schedule_flip(tty);
 432                 }
 433         }
 434
 435         schedule_work(&port->work);
 436 exit:
 437         tty_kref_put(tty);
 438 }
 439
 440 /*
 441  * qt_get_device
 442  *   Issue a GET_DEVICE vendor-specific request on the default control pipe If
 443  *   successful, fills in the qt_get_device_data structure pointed to by
 444  *   device_data, otherwise return a negative error number of the problem.
 445  */
 446
 447 static int qt_get_device(struct usb_serial *serial,
 448                          struct qt_get_device_data *device_data)
 449 {
 450         int result;
 451         unsigned char *transfer_buffer;
 452
 453         transfer_buffer =
 454             kmalloc(sizeof(struct qt_get_device_data), GFP_KERNEL);
 455         if (!transfer_buffer)
 456                 return -ENOMEM;
 457
 458         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 459                                  QT_SET_GET_DEVICE, 0xc0, 0, 0,
 460                                  transfer_buffer,
 461                                  sizeof(struct qt_get_device_data), 300);
 462         if (result > 0)
 463                 memcpy(device_data, transfer_buffer,
 464                        sizeof(struct qt_get_device_data));
 465         kfree(transfer_buffer);
 466
 467         return result;
 468 }
 469
 470 /****************************************************************************
 471  *  BoxSetPrebufferLevel
 472    TELLS BOX WHEN TO ASSERT FLOW CONTROL
 473  ****************************************************************************/
 474 static int BoxSetPrebufferLevel(struct usb_serial *serial)
 475 {
 476         int result;
 477         __u16 buffer_length;
 478
 479         buffer_length = PREFUFF_LEVEL_CONSERVATIVE;
 480         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 481                                  QT_GET_SET_PREBUF_TRIG_LVL, 0x40,
 482                                  buffer_length, 0, NULL, 0, 300);
 483         return result;
 484 }
 485
 486 /****************************************************************************
 487  *  BoxSetATC
 488    TELLS BOX WHEN TO ASSERT automatic transmitter control
 489    ****************************************************************************/
 490 static int BoxSetATC(struct usb_serial *serial, __u16 n_Mode)
 491 {
 492         int result;
 493         __u16 buffer_length;
 494
 495         buffer_length = PREFUFF_LEVEL_CONSERVATIVE;
 496
 497         result =
 498             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 499                             QT_SET_ATF, 0x40, n_Mode, 0, NULL, 0, 300);
 500
 501         return result;
 502 }
 503
 504 /**
 505  * qt_set_device
 506  *   Issue a SET_DEVICE vendor-specific request on the default control pipe If
 507  *   successful returns the number of bytes written, otherwise it returns a
 508  *   negative error number of the problem.
 509  */
 510 static int qt_set_device(struct usb_serial *serial,
 511                          struct qt_get_device_data *device_data)
 512 {
 513         int result;
 514         __u16 length;
 515         __u16 PortSettings;
 516
 517         PortSettings = ((__u16) (device_data->portb));
 518         PortSettings = (PortSettings << 8);
 519         PortSettings += ((__u16) (device_data->porta));
 520
 521         length = sizeof(struct qt_get_device_data);
 522
 523         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 524                                  QT_SET_GET_DEVICE, 0x40, PortSettings,
 525                                  0, NULL, 0, 300);
 526         return result;
 527 }
 528
 529 static int qt_open_channel(struct usb_serial *serial, __u16 Uart_Number,
 530                            struct qt_open_channel_data *pDeviceData)
 531 {
 532         int result;
 533
 534         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 535                                  QT_OPEN_CLOSE_CHANNEL,
 536                                  USBD_TRANSFER_DIRECTION_IN, 1, Uart_Number,
 537                                  pDeviceData,
 538                                  sizeof(struct qt_open_channel_data), 300);
 539
 540         return result;
 541
 542 }
 543
 544 static int qt_close_channel(struct usb_serial *serial, __u16 Uart_Number)
 545 {
 546         int result;
 547
 548         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 549                                  QT_OPEN_CLOSE_CHANNEL,
 550                                  USBD_TRANSFER_DIRECTION_OUT, 0, Uart_Number,
 551                                  NULL, 0, 300);
 552
 553         return result;
 554
 555 }
 556
 557 /****************************************************************************
 558 * BoxGetRegister
 559 *       issuse a GET_REGISTER vendor-spcific request on the default control pipe
 560 *       If successful, fills in the  pValue with the register value asked for
 561 ****************************************************************************/
 562 static int BoxGetRegister(struct usb_serial *serial, unsigned short Uart_Number,
 563                           unsigned short Register_Num, __u8 *pValue)
 564 {
 565         int result;
 566         __u16 current_length;
 567
 568         current_length = sizeof(struct qt_get_device_data);
 569
 570         result =
 571             usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 572                             QT_GET_SET_REGISTER, 0xC0, Register_Num,
 573                             Uart_Number, (void *)pValue, sizeof(*pValue), 300);
 574
 575         return result;
 576 }
 577
 578 /****************************************************************************
 579 * BoxSetRegister
 580 *       issuse a GET_REGISTER vendor-spcific request on the default control pipe
 581 *       If successful, fills in the  pValue with the register value asked for
 582 ****************************************************************************/
 583 static int BoxSetRegister(struct usb_serial *serial, unsigned short Uart_Number,
 584                           unsigned short Register_Num, unsigned short Value)
 585 {
 586         int result;
 587         unsigned short RegAndByte;
 588
 589         RegAndByte = Value;
 590         RegAndByte = RegAndByte << 8;
 591         RegAndByte = RegAndByte + Register_Num;
 592
 593 /*
 594         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 595                                  QT_GET_SET_REGISTER, 0xC0, Register_Num,
 596                                  Uart_Number, NULL, 0, 300);
 597 */
 598
 599         result =
 600             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 601                             QT_GET_SET_REGISTER, 0x40, RegAndByte, Uart_Number,
 602                             NULL, 0, 300);
 603
 604         return result;
 605 }
 606
 607 /*
 608  * qt_setuart
 609  * issues a SET_UART vendor-specific request on the default control pipe
 610  * If successful sets baud rate divisor and LCR value
 611  */
 612 static int qt_setuart(struct usb_serial *serial, unsigned short Uart_Number,
 613                       unsigned short default_divisor, unsigned char default_LCR)
 614 {
 615         int result;
 616         unsigned short UartNumandLCR;
 617
 618         UartNumandLCR = (default_LCR << 8) + Uart_Number;
 619
 620         result =
 621             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 622                             QT_GET_SET_UART, 0x40, default_divisor,
 623                             UartNumandLCR, NULL, 0, 300);
 624
 625         return result;
 626 }
 627
 628 static int BoxSetHW_FlowCtrl(struct usb_serial *serial, unsigned int index,
 629                              int bSet)
 630 {
 631         __u8 mcr = 0;
 632         __u8 msr = 0, MOUT_Value = 0;
 633         unsigned int status;
 634
 635         if (bSet == 1) {
 636                 /* flow control, box will clear RTS line to prevent remote */
 637                 mcr = SERIAL_MCR_RTS;
 638         } /* device from xmitting more chars */
 639         else {
 640                 /* no flow control to remote device */
 641                 mcr = 0;
 642
 643         }
 644         MOUT_Value = mcr << 8;
 645
 646         if (bSet == 1) {
 647                 /* flow control, box will inhibit xmit data if CTS line is
 648                  * asserted */
 649                 msr = SERIAL_MSR_CTS;
 650         } else {
 651                 /* Box will not inhimbe xmit data due to CTS line */
 652                 msr = 0;
 653         }
 654         MOUT_Value |= msr;
 655
 656         status =
 657             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 658                             QT_HW_FLOW_CONTROL_MASK, 0x40, MOUT_Value,
 659                             index, NULL, 0, 300);
 660         return status;
 661
 662 }
 663
 664 static int BoxSetSW_FlowCtrl(struct usb_serial *serial, __u16 index,
 665                              unsigned char stop_char, unsigned char start_char)
 666 {
 667         __u16 nSWflowout;
 668         int result;
 669
 670         nSWflowout = start_char << 8;
 671         nSWflowout = (unsigned short)stop_char;
 672
 673         result =
 674             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 675                             QT_SW_FLOW_CONTROL_MASK, 0x40, nSWflowout,
 676                             index, NULL, 0, 300);
 677         return result;
 678
 679 }
 680
 681 static int BoxDisable_SW_FlowCtrl(struct usb_serial *serial, __u16 index)
 682 {
 683         int result;
 684
 685         result =
 686             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 687                             QT_SW_FLOW_CONTROL_DISABLE, 0x40, 0, index,
 688                             NULL, 0, 300);
 689         return result;
 690
 691 }
 692
 693 static int qt_startup(struct usb_serial *serial)
 694 {
 695         struct device *dev = &serial->dev->dev;
 696         struct usb_serial_port *port;
 697         struct quatech_port *qt_port;
 698         struct qt_get_device_data DeviceData;
 699         int i;
 700         int status;
 701
 702         /* Now setup per port private data */
 703         for (i = 0; i < serial->num_ports; i++) {
 704                 port = serial->port[i];
 705                 qt_port = kzalloc(sizeof(*qt_port), GFP_KERNEL);
 706                 if (!qt_port) {
 707                         for (--i; i >= 0; i--) {
 708                                 port = serial->port[i];
 709                                 kfree(usb_get_serial_port_data(port));
 710                                 usb_set_serial_port_data(port, NULL);
 711                         }
 712                         return -ENOMEM;
 713                 }
 714                 mutex_init(&qt_port->lock);
 715
 716                 usb_set_serial_port_data(port, qt_port);
 717
 718         }
 719
 720         status = qt_get_device(serial, &DeviceData);
 721         if (status < 0)
 722                 goto startup_error;
 723
 724         dev_dbg(dev, "DeviceData.portb = 0x%x\n", DeviceData.portb);
 725
 726         DeviceData.portb &= ~FULLPWRBIT;
 727         dev_dbg(dev, "Changing DeviceData.portb to 0x%x\n", DeviceData.portb);
 728
 729         status = qt_set_device(serial, &DeviceData);
 730         if (status < 0) {
 731                 dev_dbg(dev, "qt_set_device failed\n");
 732                 goto startup_error;
 733         }
 734
 735         status = qt_get_device(serial, &DeviceData);
 736         if (status < 0) {
 737                 dev_dbg(dev, "qt_get_device failed\n");
 738                 goto startup_error;
 739         }
 740
 741         switch (serial->dev->descriptor.idProduct) {
 742         case QUATECH_DSU100:
 743         case QUATECH_QSU100:
 744         case QUATECH_ESU100A:
 745         case QUATECH_ESU100B:
 746         case QUATECH_HSU100A:
 747         case QUATECH_HSU100B:
 748         case QUATECH_HSU100C:
 749         case QUATECH_HSU100D:
 750                 DeviceData.porta &= ~(RR_BITS | DUPMODE_BITS);
 751                 DeviceData.porta |= CLKS_X4;
 752                 DeviceData.portb &= ~(LOOPMODE_BITS);
 753                 DeviceData.portb |= RS232_MODE;
 754                 break;
 755
 756         case QUATECH_SSU200:
 757         case QUATECH_DSU200:
 758         case QUATECH_QSU200:
 759         case QUATECH_ESU200A:
 760         case QUATECH_ESU200B:
 761         case QUATECH_HSU200A:
 762         case QUATECH_HSU200B:
 763         case QUATECH_HSU200C:
 764         case QUATECH_HSU200D:
 765                 DeviceData.porta &= ~(RR_BITS | DUPMODE_BITS);
 766                 DeviceData.porta |= CLKS_X4;
 767                 DeviceData.portb &= ~(LOOPMODE_BITS);
 768                 DeviceData.portb |= ALL_LOOPBACK;
 769                 break;
 770         default:
 771                 DeviceData.porta &= ~(RR_BITS | DUPMODE_BITS);
 772                 DeviceData.porta |= CLKS_X4;
 773                 DeviceData.portb &= ~(LOOPMODE_BITS);
 774                 DeviceData.portb |= RS232_MODE;
 775                 break;
 776
 777         }
 778
 779         status = BoxSetPrebufferLevel(serial);  /* sets to default value */
 780         if (status < 0) {
 781                 dev_dbg(dev, "BoxSetPrebufferLevel failed\n");
 782                 goto startup_error;
 783         }
 784
 785         status = BoxSetATC(serial, ATC_DISABLED);
 786         if (status < 0) {
 787                 dev_dbg(dev, "BoxSetATC failed\n");
 788                 goto startup_error;
 789         }
 790
 791         dev_dbg(dev, "DeviceData.portb = 0x%x\n", DeviceData.portb);
 792
 793         DeviceData.portb |= NEXT_BOARD_POWER_BIT;
 794         dev_dbg(dev, "Changing DeviceData.portb to 0x%x\n", DeviceData.portb);
 795
 796         status = qt_set_device(serial, &DeviceData);
 797         if (status < 0) {
 798                 dev_dbg(dev, "qt_set_device failed\n");
 799                 goto startup_error;
 800         }
 801
 802         return 0;
 803
 804 startup_error:
 805         for (i = 0; i < serial->num_ports; i++) {
 806                 port = serial->port[i];
 807                 qt_port = qt_get_port_private(port);
 808                 kfree(qt_port);
 809                 usb_set_serial_port_data(port, NULL);
 810         }
 811
 812         return -EIO;
 813 }
 814
 815 static void qt_release(struct usb_serial *serial)
 816 {
 817         struct usb_serial_port *port;
 818         struct quatech_port *qt_port;
 819         int i;
 820
 821         for (i = 0; i < serial->num_ports; i++) {
 822                 port = serial->port[i];
 823                 if (!port)
 824                         continue;
 825
 826                 qt_port = usb_get_serial_port_data(port);
 827                 kfree(qt_port);
 828                 usb_set_serial_port_data(port, NULL);
 829         }
 830
 831 }
 832
 833 static void qt_submit_urb_from_open(struct usb_serial *serial,
 834                                     struct usb_serial_port *port)
 835 {
 836         int result;
 837         struct usb_serial_port *port0 = serial->port[0];
 838
 839         /* set up interrupt urb */
 840         usb_fill_int_urb(port0->interrupt_in_urb,
 841                          serial->dev,
 842                          usb_rcvintpipe(serial->dev,
 843                                         port0->interrupt_in_endpointAddress),
 844                          port0->interrupt_in_buffer,
 845                          port0->interrupt_in_urb->transfer_buffer_length,
 846                          qt_interrupt_callback, serial,
 847                          port0->interrupt_in_urb->interval);
 848
 849         result = usb_submit_urb(port0->interrupt_in_urb,
 850                                 GFP_KERNEL);
 851         if (result) {
 852                 dev_err(&port->dev,
 853                         "%s - Error %d submitting interrupt urb\n",
 854                         __func__, result);
 855         }
 856 }
 857
 858 static int qt_open(struct tty_struct *tty,
 859                    struct usb_serial_port *port)
 860 {
 861         struct usb_serial *serial;
 862         struct quatech_port *quatech_port;
 863         struct quatech_port *port0;
 864         struct qt_open_channel_data ChannelData;
 865
 866         int result;
 867
 868         if (port_paranoia_check(port, __func__))
 869                 return -ENODEV;
 870
 871         serial = port->serial;
 872
 873         if (serial_paranoia_check(serial, __func__))
 874                 return -ENODEV;
 875
 876         quatech_port = qt_get_port_private(port);
 877         port0 = qt_get_port_private(serial->port[0]);
 878
 879         if (quatech_port == NULL || port0 == NULL)
 880                 return -ENODEV;
 881
 882         usb_clear_halt(serial->dev, port->write_urb->pipe);
 883         usb_clear_halt(serial->dev, port->read_urb->pipe);
 884         port0->open_ports++;
 885
 886         result = qt_get_device(serial, &port0->DeviceData);
 887
 888         /* Port specific setups */
 889         result = qt_open_channel(serial, port->number, &ChannelData);
 890         if (result < 0) {
 891                 dev_dbg(&port->dev, "qt_open_channel failed\n");
 892                 return result;
 893         }
 894         dev_dbg(&port->dev, "qt_open_channel completed.\n");
 895
 896 /* FIXME: are these needed?  Does it even do anything useful? */
 897         quatech_port->shadowLSR = ChannelData.line_status &
 898             (SERIAL_LSR_OE | SERIAL_LSR_PE | SERIAL_LSR_FE | SERIAL_LSR_BI);
 899
 900         quatech_port->shadowMSR = ChannelData.modem_status &
 901             (SERIAL_MSR_CTS | SERIAL_MSR_DSR | SERIAL_MSR_RI | SERIAL_MSR_CD);
 902
 903         /* Set Baud rate to default and turn off (default)flow control here */
 904         result = qt_setuart(serial, port->number, DEFAULT_DIVISOR, DEFAULT_LCR);
 905         if (result < 0) {
 906                 dev_dbg(&port->dev, "qt_setuart failed\n");
 907                 return result;
 908         }
 909         dev_dbg(&port->dev, "qt_setuart completed.\n");
 910
 911         /*
 912          * Put this here to make it responsive to stty and defaults set by
 913          * the tty layer
 914          */
 915
 916         /*  Check to see if we've set up our endpoint info yet */
 917         if (port0->open_ports == 1) {
 918                 if (serial->port[0]->interrupt_in_buffer == NULL)
 919                         qt_submit_urb_from_open(serial, port);
 920         }
 921
 922         dev_dbg(&port->dev, "port number is %d\n", port->number);
 923         dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
 924         dev_dbg(&port->dev,
 925                 "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
 926         dev_dbg(&port->dev,
 927                 "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
 928         dev_dbg(&port->dev, "Interrupt endpoint is %d\n",
 929                 port->interrupt_in_endpointAddress);
 930         dev_dbg(&port->dev, "port's number in the device is %d\n",
 931                 quatech_port->port_num);
 932         quatech_port->read_urb = port->read_urb;
 933
 934         /* set up our bulk in urb */
 935
 936         usb_fill_bulk_urb(quatech_port->read_urb,
 937                           serial->dev,
 938                           usb_rcvbulkpipe(serial->dev,
 939                                           port->bulk_in_endpointAddress),
 940                           port->bulk_in_buffer,
 941                           quatech_port->read_urb->transfer_buffer_length,
 942                           qt_read_bulk_callback, quatech_port);
 943
 944         dev_dbg(&port->dev, "qt_open: bulkin endpoint is %d\n",
 945                 port->bulk_in_endpointAddress);
 946         quatech_port->read_urb_busy = true;
 947         result = usb_submit_urb(quatech_port->read_urb, GFP_KERNEL);
 948         if (result) {
 949                 dev_err(&port->dev,
 950                         "%s - Error %d submitting control urb\n",
 951                         __func__, result);
 952                 quatech_port->read_urb_busy = false;
 953         }
 954
 955         /* initialize our wait queues */
 956         init_waitqueue_head(&quatech_port->wait);
 957         init_waitqueue_head(&quatech_port->msr_wait);
 958
 959         /* initialize our icount structure */
 960         memset(&(quatech_port->icount), 0x00, sizeof(quatech_port->icount));
 961
 962         return 0;
 963
 964 }
 965
 966 static int qt_chars_in_buffer(struct tty_struct *tty)
 967 {
 968         struct usb_serial_port *port = tty->driver_data;
 969         struct usb_serial *serial;
 970         int chars = 0;
 971
 972         serial = get_usb_serial(port, __func__);
 973
 974         if (serial->num_bulk_out) {
 975                 if (port->write_urb->status == -EINPROGRESS)
 976                         chars = port->write_urb->transfer_buffer_length;
 977         }
 978
 979         return chars;
 980 }
 981
 982 static void qt_block_until_empty(struct tty_struct *tty,
 983                                  struct quatech_port *qt_port)
 984 {
 985         int timeout = HZ / 10;
 986         int wait = 30;
 987         int count;
 988
 989         while (1) {
 990
 991                 count = qt_chars_in_buffer(tty);
 992
 993                 if (count <= 0)
 994                         return;
 995
 996                 interruptible_sleep_on_timeout(&qt_port->wait, timeout);
 997
 998                 wait--;
 999                 if (wait == 0) {
1000                         dev_dbg(&qt_port->port->dev, "%s - TIMEOUT", __func__);
1001                         return;
1002                 } else {
1003                         wait = 30;
1004                 }
1005         }
1006 }
1007
1008 static void qt_close(struct usb_serial_port *port)
1009 {
1010         struct usb_serial *serial = port->serial;
1011         struct quatech_port *qt_port;
1012         struct quatech_port *port0;
1013         struct tty_struct *tty;
1014         int status;
1015         unsigned int index;
1016         status = 0;
1017
1018         tty = tty_port_tty_get(&port->port);
1019         index = tty->index - serial->minor;
1020
1021         qt_port = qt_get_port_private(port);
1022         port0 = qt_get_port_private(serial->port[0]);
1023
1024         /* shutdown any bulk reads that might be going on */
1025         if (serial->num_bulk_out)
1026                 usb_unlink_urb(port->write_urb);
1027         if (serial->num_bulk_in)
1028                 usb_unlink_urb(port->read_urb);
1029
1030         /* wait up to for transmitter to empty */
1031         if (serial->dev)
1032                 qt_block_until_empty(tty, qt_port);
1033         tty_kref_put(tty);
1034
1035         /* Close uart channel */
1036         status = qt_close_channel(serial, index);
1037         if (status < 0)
1038                 dev_dbg(&port->dev,
1039                         "%s - port %d qt_close_channel failed.\n",
1040                         __func__, port->number);
1041
1042         port0->open_ports--;
1043
1044         dev_dbg(&port->dev, "qt_num_open_ports in close%d:in port%d\n",
1045                 port0->open_ports, port->number);
1046
1047         if (port0->open_ports == 0) {
1048                 if (serial->port[0]->interrupt_in_urb) {
1049                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1050                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1051                 }
1052
1053         }
1054
1055         if (qt_port->write_urb) {
1056                 /* if this urb had a transfer buffer already (old tx) free it */
1057                 kfree(qt_port->write_urb->transfer_buffer);
1058                 usb_free_urb(qt_port->write_urb);
1059         }
1060
1061 }
1062
1063 static int qt_write(struct tty_struct *tty, struct usb_serial_port *port,
1064                     const unsigned char *buf, int count)
1065 {
1066         int result;
1067         struct usb_serial *serial = get_usb_serial(port, __func__);
1068
1069         if (serial == NULL)
1070                 return -ENODEV;
1071
1072         if (count == 0) {
1073                 dev_dbg(&port->dev,
1074                         "%s - write request of 0 bytes\n", __func__);
1075                 return 0;
1076         }
1077
1078         /* only do something if we have a bulk out endpoint */
1079         if (serial->num_bulk_out) {
1080                 if (port->write_urb->status == -EINPROGRESS) {
1081                         dev_dbg(&port->dev, "%s - already writing\n", __func__);
1082                         return 0;
1083                 }
1084
1085                 count =
1086                     (count > port->bulk_out_size) ? port->bulk_out_size : count;
1087                 memcpy(port->write_urb->transfer_buffer, buf, count);
1088
1089                 /* set up our urb */
1090
1091                 usb_fill_bulk_urb(port->write_urb, serial->dev,
1092                                   usb_sndbulkpipe(serial->dev,
1093                                                   port->
1094                                                   bulk_out_endpointAddress),
1095                                   port->write_urb->transfer_buffer, count,
1096                                   qt_write_bulk_callback, port);
1097
1098                 /* send the data out the bulk port */
1099                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1100                 if (result)
1101                         dev_dbg(&port->dev,
1102                                 "%s - failed submitting write urb, error %d\n",
1103                                 __func__, result);
1104                 else
1105                         result = count;
1106
1107                 return result;
1108         }
1109
1110         /* no bulk out, so return 0 bytes written */
1111         return 0;
1112 }
1113
1114 static int qt_write_room(struct tty_struct *tty)
1115 {
1116         struct usb_serial_port *port = tty->driver_data;
1117         struct usb_serial *serial;
1118         struct quatech_port *qt_port;
1119
1120         int retval = -EINVAL;
1121
1122         if (port_paranoia_check(port, __func__))
1123                 return -1;
1124
1125         serial = get_usb_serial(port, __func__);
1126
1127         if (!serial)
1128                 return -ENODEV;
1129
1130         qt_port = qt_get_port_private(port);
1131
1132         mutex_lock(&qt_port->lock);
1133
1134         if (serial->num_bulk_out) {
1135                 if (port->write_urb->status != -EINPROGRESS)
1136                         retval = port->bulk_out_size;
1137         }
1138
1139         mutex_unlock(&qt_port->lock);
1140         return retval;
1141
1142 }
1143
1144 static int qt_ioctl(struct tty_struct *tty,
1145                     unsigned int cmd, unsigned long arg)
1146 {
1147         struct usb_serial_port *port = tty->driver_data;
1148         struct quatech_port *qt_port = qt_get_port_private(port);
1149         struct usb_serial *serial = get_usb_serial(port, __func__);
1150         unsigned int index;
1151
1152         dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
1153
1154         index = tty->index - serial->minor;
1155
1156         if (cmd == TIOCMIWAIT) {
1157                 while (qt_port != NULL) {
1158                         interruptible_sleep_on(&qt_port->msr_wait);
1159                         if (signal_pending(current))
1160                                 return -ERESTARTSYS;
1161                         else {
1162                                 char diff = qt_port->diff_status;
1163
1164                                 if (diff == 0)
1165                                         return -EIO;    /* no change => error */
1166
1167                                 /* Consume all events */
1168                                 qt_port->diff_status = 0;
1169
1170                                 if (((arg & TIOCM_RNG)
1171                                      && (diff & SERIAL_MSR_RI))
1172                                     || ((arg & TIOCM_DSR)
1173                                         && (diff & SERIAL_MSR_DSR))
1174                                     || ((arg & TIOCM_CD)
1175                                         && (diff & SERIAL_MSR_CD))
1176                                     || ((arg & TIOCM_CTS)
1177                                         && (diff & SERIAL_MSR_CTS))) {
1178                                         return 0;
1179                                 }
1180                         }
1181                 }
1182                 return 0;
1183         }
1184
1185         dev_dbg(&port->dev, "%s -No ioctl for that one.  port = %d\n",
1186                 __func__, port->number);
1187         return -ENOIOCTLCMD;
1188 }
1189
1190 static void qt_set_termios(struct tty_struct *tty,
1191                            struct usb_serial_port *port,
1192                            struct ktermios *old_termios)
1193 {
1194         struct ktermios *termios = &tty->termios;
1195         unsigned char new_LCR = 0;
1196         unsigned int cflag = termios->c_cflag;
1197         unsigned int index;
1198         int baud, divisor, remainder;
1199         int status;
1200
1201         index = tty->index - port->serial->minor;
1202
1203         switch (cflag & CSIZE) {
1204         case CS5:
1205                 new_LCR |= SERIAL_5_DATA;
1206                 break;
1207         case CS6:
1208                 new_LCR |= SERIAL_6_DATA;
1209                 break;
1210         case CS7:
1211                 new_LCR |= SERIAL_7_DATA;
1212                 break;
1213         default:
1214                 termios->c_cflag &= ~CSIZE;
1215                 termios->c_cflag |= CS8;
1216         case CS8:
1217                 new_LCR |= SERIAL_8_DATA;
1218                 break;
1219         }
1220
1221         /* Parity stuff */
1222         if (cflag & PARENB) {
1223                 if (cflag & PARODD)
1224                         new_LCR |= SERIAL_ODD_PARITY;
1225                 else
1226                         new_LCR |= SERIAL_EVEN_PARITY;
1227         }
1228         if (cflag & CSTOPB)
1229                 new_LCR |= SERIAL_TWO_STOPB;
1230         else
1231                 new_LCR |= SERIAL_ONE_STOPB;
1232
1233         dev_dbg(&port->dev, "%s - 4\n", __func__);
1234
1235         /* Thats the LCR stuff, go ahead and set it */
1236         baud = tty_get_baud_rate(tty);
1237         if (!baud)
1238                 /* pick a default, any default... */
1239                 baud = 9600;
1240
1241         dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud);
1242
1243         divisor = MAX_BAUD_RATE / baud;
1244         remainder = MAX_BAUD_RATE % baud;
1245         /* Round to nearest divisor */
1246         if (((remainder * 2) >= baud) && (baud != 110))
1247                 divisor++;
1248
1249         /*
1250          * Set Baud rate to default and turn off (default)flow control here
1251          */
1252         status =
1253             qt_setuart(port->serial, index, (unsigned short)divisor, new_LCR);
1254         if (status < 0) {
1255                 dev_dbg(&port->dev, "qt_setuart failed\n");
1256                 return;
1257         }
1258
1259         /* Now determine flow control */
1260         if (cflag & CRTSCTS) {
1261                 dev_dbg(&port->dev, "%s - Enabling HW flow control port %d\n",
1262                         __func__, port->number);
1263
1264                 /* Enable RTS/CTS flow control */
1265                 status = BoxSetHW_FlowCtrl(port->serial, index, 1);
1266
1267                 if (status < 0) {
1268                         dev_dbg(&port->dev, "BoxSetHW_FlowCtrl failed\n");
1269                         return;
1270                 }
1271         } else {
1272                 /* Disable RTS/CTS flow control */
1273                 dev_dbg(&port->dev,
1274                         "%s - disabling HW flow control port %d\n",
1275                         __func__, port->number);
1276
1277                 status = BoxSetHW_FlowCtrl(port->serial, index, 0);
1278                 if (status < 0) {
1279                         dev_dbg(&port->dev, "BoxSetHW_FlowCtrl failed\n");
1280                         return;
1281                 }
1282
1283         }
1284
1285         /* if we are implementing XON/XOFF, set the start and stop character in
1286          * the device */
1287         if (I_IXOFF(tty) || I_IXON(tty)) {
1288                 unsigned char stop_char = STOP_CHAR(tty);
1289                 unsigned char start_char = START_CHAR(tty);
1290                 status =
1291                     BoxSetSW_FlowCtrl(port->serial, index, stop_char,
1292                                       start_char);
1293                 if (status < 0)
1294                         dev_dbg(&port->dev,
1295                                 "BoxSetSW_FlowCtrl (enabled) failed\n");
1296
1297         } else {
1298                 /* disable SW flow control */
1299                 status = BoxDisable_SW_FlowCtrl(port->serial, index);
1300                 if (status < 0)
1301                         dev_dbg(&port->dev,
1302                                 "BoxSetSW_FlowCtrl (diabling) failed\n");
1303
1304         }
1305         termios->c_cflag &= ~CMSPAR;
1306         /* FIXME:
1307            Error cases should be returning the actual bits changed only
1308         */
1309 }
1310
1311 static void qt_break(struct tty_struct *tty, int break_state)
1312 {
1313         struct usb_serial_port *port = tty->driver_data;
1314         struct usb_serial *serial = get_usb_serial(port, __func__);
1315         struct quatech_port *qt_port;
1316         u16 index, onoff;
1317         unsigned int result;
1318
1319         index = tty->index - serial->minor;
1320
1321         qt_port = qt_get_port_private(port);
1322
1323         if (break_state == -1)
1324                 onoff = 1;
1325         else
1326                 onoff = 0;
1327
1328         mutex_lock(&qt_port->lock);
1329
1330         result =
1331             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1332                             QT_BREAK_CONTROL, 0x40, onoff, index, NULL, 0, 300);
1333
1334         mutex_unlock(&qt_port->lock);
1335 }
1336
1337 static inline int qt_real_tiocmget(struct tty_struct *tty,
1338                                    struct usb_serial_port *port,
1339                                    struct usb_serial *serial)
1340 {
1341
1342         u8 mcr;
1343         u8 msr;
1344         unsigned int result = 0;
1345         int status;
1346         unsigned int index;
1347
1348         index = tty->index - serial->minor;
1349         status =
1350             BoxGetRegister(port->serial, index, MODEM_CONTROL_REGISTER, &mcr);
1351         if (status >= 0) {
1352                 status =
1353                     BoxGetRegister(port->serial, index,
1354                                    MODEM_STATUS_REGISTER, &msr);
1355
1356         }
1357
1358         if (status >= 0) {
1359                 result = ((mcr & SERIAL_MCR_DTR) ? TIOCM_DTR : 0)
1360                     /* DTR IS SET */
1361                     | ((mcr & SERIAL_MCR_RTS) ? TIOCM_RTS : 0)
1362                     /* RTS IS SET */
1363                     | ((msr & SERIAL_MSR_CTS) ? TIOCM_CTS : 0)
1364                     /* CTS is set */
1365                     | ((msr & SERIAL_MSR_CD) ? TIOCM_CAR : 0)
1366                     /* Carrier detect is set */
1367                     | ((msr & SERIAL_MSR_RI) ? TIOCM_RI : 0)
1368                     /* Ring indicator set */
1369                     | ((msr & SERIAL_MSR_DSR) ? TIOCM_DSR : 0);
1370                 /* DSR is set */
1371                 return result;
1372
1373         } else
1374                 return -ESPIPE;
1375 }
1376
1377 static inline int qt_real_tiocmset(struct tty_struct *tty,
1378                                    struct usb_serial_port *port,
1379                                    struct usb_serial *serial,
1380                                    unsigned int value)
1381 {
1382
1383         u8 mcr;
1384         int status;
1385         unsigned int index;
1386
1387         index = tty->index - serial->minor;
1388         status =
1389             BoxGetRegister(port->serial, index, MODEM_CONTROL_REGISTER, &mcr);
1390         if (status < 0)
1391                 return -ESPIPE;
1392
1393         /*
1394          * Turn off the RTS and DTR and loopback and then only turn on what was
1395          * asked for
1396          */
1397         mcr &= ~(SERIAL_MCR_RTS | SERIAL_MCR_DTR | SERIAL_MCR_LOOP);
1398         if (value & TIOCM_RTS)
1399                 mcr |= SERIAL_MCR_RTS;
1400         if (value & TIOCM_DTR)
1401                 mcr |= SERIAL_MCR_DTR;
1402         if (value & TIOCM_LOOP)
1403                 mcr |= SERIAL_MCR_LOOP;
1404
1405         status =
1406             BoxSetRegister(port->serial, index, MODEM_CONTROL_REGISTER, mcr);
1407         if (status < 0)
1408                 return -ESPIPE;
1409         else
1410                 return 0;
1411 }
1412
1413 static int qt_tiocmget(struct tty_struct *tty)
1414 {
1415         struct usb_serial_port *port = tty->driver_data;
1416         struct usb_serial *serial = get_usb_serial(port, __func__);
1417         struct quatech_port *qt_port = qt_get_port_private(port);
1418         int retval;
1419
1420         if (!serial)
1421                 return -ENODEV;
1422
1423         mutex_lock(&qt_port->lock);
1424         retval = qt_real_tiocmget(tty, port, serial);
1425         mutex_unlock(&qt_port->lock);
1426         return retval;
1427 }
1428
1429 static int qt_tiocmset(struct tty_struct *tty,
1430                        unsigned int set, unsigned int clear)
1431 {
1432
1433         struct usb_serial_port *port = tty->driver_data;
1434         struct usb_serial *serial = get_usb_serial(port, __func__);
1435         struct quatech_port *qt_port = qt_get_port_private(port);
1436         int retval;
1437
1438         if (!serial)
1439                 return -ENODEV;
1440
1441         mutex_lock(&qt_port->lock);
1442         retval = qt_real_tiocmset(tty, port, serial, set);
1443         mutex_unlock(&qt_port->lock);
1444         return retval;
1445 }
1446
1447 static void qt_throttle(struct tty_struct *tty)
1448 {
1449         struct usb_serial_port *port = tty->driver_data;
1450         struct usb_serial *serial = get_usb_serial(port, __func__);
1451         struct quatech_port *qt_port;
1452
1453         if (!serial)
1454                 return;
1455
1456         qt_port = qt_get_port_private(port);
1457
1458         mutex_lock(&qt_port->lock);
1459
1460         /* pass on to the driver specific version of this function */
1461         qt_port->RxHolding = 1;
1462
1463         mutex_unlock(&qt_port->lock);
1464 }
1465
1466 static void qt_submit_urb_from_unthrottle(struct usb_serial_port *port,
1467                                           struct usb_serial *serial)
1468 {
1469         int result;
1470
1471         /* Start reading from the device */
1472         usb_fill_bulk_urb(port->read_urb, serial->dev,
1473                           usb_rcvbulkpipe(serial->dev,
1474                                           port->bulk_in_endpointAddress),
1475                           port->read_urb->transfer_buffer,
1476                           port->read_urb->transfer_buffer_length,
1477                           qt_read_bulk_callback, port);
1478
1479         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1480
1481         if (result)
1482                 dev_err(&port->dev,
1483                         "%s - failed restarting read urb, error %d\n",
1484                         __func__, result);
1485 }
1486
1487 static void qt_unthrottle(struct tty_struct *tty)
1488 {
1489         struct usb_serial_port *port = tty->driver_data;
1490         struct usb_serial *serial = get_usb_serial(port, __func__);
1491         struct quatech_port *qt_port;
1492
1493         if (!serial)
1494                 return;
1495
1496         qt_port = qt_get_port_private(port);
1497
1498         mutex_lock(&qt_port->lock);
1499
1500         if (qt_port->RxHolding == 1) {
1501                 dev_dbg(&port->dev, "%s -qt_port->RxHolding == 1\n", __func__);
1502
1503                 qt_port->RxHolding = 0;
1504                 dev_dbg(&port->dev, "%s - qt_port->RxHolding = 0\n", __func__);
1505
1506                 /* if we have a bulk endpoint, start it up */
1507                 if ((serial->num_bulk_in) && (qt_port->ReadBulkStopped == 1))
1508                         qt_submit_urb_from_unthrottle(port, serial);
1509         }
1510         mutex_unlock(&qt_port->lock);
1511 }
1512
1513 static int qt_calc_num_ports(struct usb_serial *serial)
1514 {
1515         int num_ports;
1516
1517         num_ports =
1518             (serial->interface->cur_altsetting->desc.bNumEndpoints - 1) / 2;
1519
1520         return num_ports;
1521 }
1522
1523 static struct usb_serial_driver quatech_device = {
1524         .driver = {
1525                    .owner = THIS_MODULE,
1526                    .name = "serqt",
1527                    },
1528         .description = DRIVER_DESC,
1529         .id_table = id_table,
1530         .num_ports = 8,
1531         .open = qt_open,
1532         .close = qt_close,
1533         .write = qt_write,
1534         .write_room = qt_write_room,
1535         .chars_in_buffer = qt_chars_in_buffer,
1536         .throttle = qt_throttle,
1537         .unthrottle = qt_unthrottle,
1538         .calc_num_ports = qt_calc_num_ports,
1539         .ioctl = qt_ioctl,
1540         .set_termios = qt_set_termios,
1541         .break_ctl = qt_break,
1542         .tiocmget = qt_tiocmget,
1543         .tiocmset = qt_tiocmset,
1544         .attach = qt_startup,
1545         .release = qt_release,
1546 };
1547
1548 static struct usb_serial_driver * const serial_drivers[] = {
1549         &quatech_device, NULL
1550 };
1551
1552 module_usb_serial_driver(serial_drivers, id_table);
1553
1554 MODULE_AUTHOR(DRIVER_AUTHOR);
1555 MODULE_DESCRIPTION(DRIVER_DESC);
1556 MODULE_LICENSE("GPL");