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 shadow_lcr;                /* last LCR value received */
 159         __u8 shadow_mcr;                /* last MCR value received */
 160         __u8 shadow_msr;                /* last MSR value received */
 161         __u8 shadow_lsr;                /* 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 device_data;
 174         struct mutex lock;
 175         bool read_urb_busy;
 176         int rx_holding;
 177         int read_bulk_stopped;
 178         char close_pending;
 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 process_line_status(struct quatech_port *qt_port,
 242                               unsigned char line_status)
 243 {
 244
 245         qt_port->shadow_lsr =
 246             line_status & (SERIAL_LSR_OE | SERIAL_LSR_PE | SERIAL_LSR_FE |
 247                            SERIAL_LSR_BI);
 248 }
 249
 250 static void process_modem_status(struct quatech_port *qt_port,
 251                                unsigned char modem_status)
 252 {
 253
 254         qt_port->shadow_msr = modem_status;
 255         wake_up_interruptible(&qt_port->wait);
 256 }
 257
 258 static void process_rx_char(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         int status;
 268         struct quatech_port *quatech_port;
 269
 270         status = urb->status;
 271
 272         if (status) {
 273                 dev_dbg(&urb->dev->dev,
 274                         "nonzero write bulk status received:%d\n", status);
 275                 return;
 276         }
 277
 278         quatech_port = urb->context;
 279
 280         tty_port_tty_wakeup(&quatech_port->port->port);
 281 }
 282
 283 static void qt_interrupt_callback(struct urb *urb)
 284 {
 285         /* FIXME */
 286 }
 287
 288 static void qt_status_change_check(struct urb *urb,
 289                                    struct quatech_port *qt_port,
 290                                    struct usb_serial_port *port)
 291 {
 292         int flag, i;
 293         unsigned char *data = urb->transfer_buffer;
 294         unsigned int rx_count = urb->actual_length;
 295
 296         for (i = 0; i < rx_count; ++i) {
 297                 /* Look ahead code here */
 298                 if ((i <= (rx_count - 3)) && (data[i] == 0x1b)
 299                     && (data[i + 1] == 0x1b)) {
 300                         flag = 0;
 301                         switch (data[i + 2]) {
 302                         case 0x00:
 303                                 if (i > (rx_count - 4)) {
 304                                         dev_dbg(&port->dev,
 305                                                 "Illegal escape seuences in received data\n");
 306                                         break;
 307                                 }
 308
 309                                 process_line_status(qt_port, data[i + 3]);
 310
 311                                 i += 3;
 312                                 flag = 1;
 313                                 break;
 314
 315                         case 0x01:
 316                                 if (i > (rx_count - 4)) {
 317                                         dev_dbg(&port->dev,
 318                                                 "Illegal escape seuences in received data\n");
 319                                         break;
 320                                 }
 321
 322                                 process_modem_status(qt_port, data[i + 3]);
 323
 324                                 i += 3;
 325                                 flag = 1;
 326                                 break;
 327
 328                         case 0xff:
 329                                 dev_dbg(&port->dev, "No status sequence.\n");
 330
 331                                 process_rx_char(port, data[i]);
 332                                 process_rx_char(port, data[i + 1]);
 333
 334                                 i += 2;
 335                                 break;
 336                         }
 337                         if (flag == 1)
 338                                 continue;
 339                 }
 340
 341                 if (urb->actual_length)
 342                         tty_insert_flip_char(&port->port, data[i], TTY_NORMAL);
 343
 344         }
 345         tty_flip_buffer_push(&port->port);
 346 }
 347
 348 static void qt_read_bulk_callback(struct urb *urb)
 349 {
 350
 351         struct usb_serial_port *port = urb->context;
 352         struct usb_serial *serial = get_usb_serial(port, __func__);
 353         struct quatech_port *qt_port = qt_get_port_private(port);
 354         int result;
 355
 356         if (urb->status) {
 357                 qt_port->read_bulk_stopped = 1;
 358                 dev_dbg(&urb->dev->dev,
 359                         "%s - nonzero write bulk status received: %d\n",
 360                         __func__, urb->status);
 361                 return;
 362         }
 363
 364         dev_dbg(&port->dev,
 365                 "%s - port->rx_holding = %d\n", __func__, qt_port->rx_holding);
 366
 367         if (port_paranoia_check(port, __func__) != 0) {
 368                 qt_port->read_bulk_stopped = 1;
 369                 return;
 370         }
 371
 372         if (!serial)
 373                 return;
 374
 375         if (qt_port->close_pending == 1) {
 376                 /* Were closing , stop reading */
 377                 dev_dbg(&port->dev,
 378                         "%s - (qt_port->close_pending == 1\n", __func__);
 379                 qt_port->read_bulk_stopped = 1;
 380                 return;
 381         }
 382
 383         /*
 384          * rx_holding is asserted by throttle, if we assert it, we're not
 385          * receiving any more characters and let the box handle the flow
 386          * control
 387          */
 388         if (qt_port->rx_holding == 1) {
 389                 qt_port->read_bulk_stopped = 1;
 390                 return;
 391         }
 392
 393         if (urb->status) {
 394                 qt_port->read_bulk_stopped = 1;
 395
 396                 dev_dbg(&port->dev,
 397                         "%s - nonzero read bulk status received: %d\n",
 398                         __func__, urb->status);
 399                 return;
 400         }
 401
 402         if (urb->actual_length)
 403                 qt_status_change_check(urb, qt_port, port);
 404
 405         /* Continue trying to always read  */
 406         usb_fill_bulk_urb(port->read_urb, serial->dev,
 407                           usb_rcvbulkpipe(serial->dev,
 408                                           port->bulk_in_endpointAddress),
 409                           port->read_urb->transfer_buffer,
 410                           port->read_urb->transfer_buffer_length,
 411                           qt_read_bulk_callback, port);
 412         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 413         if (result)
 414                 dev_dbg(&port->dev,
 415                         "%s - failed resubmitting read urb, error %d",
 416                         __func__, result);
 417         else {
 418                 if (urb->actual_length) {
 419                         tty_flip_buffer_push(&port->port);
 420                         tty_schedule_flip(&port->port);
 421                 }
 422         }
 423
 424         schedule_work(&port->work);
 425 }
 426
 427 /*
 428  * qt_get_device
 429  *   Issue a GET_DEVICE vendor-specific request on the default control pipe If
 430  *   successful, fills in the qt_get_device_data structure pointed to by
 431  *   device_data, otherwise return a negative error number of the problem.
 432  */
 433
 434 static int qt_get_device(struct usb_serial *serial,
 435                          struct qt_get_device_data *device_data)
 436 {
 437         int result;
 438         unsigned char *transfer_buffer;
 439
 440         transfer_buffer =
 441             kmalloc(sizeof(struct qt_get_device_data), GFP_KERNEL);
 442         if (!transfer_buffer)
 443                 return -ENOMEM;
 444
 445         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 446                                  QT_SET_GET_DEVICE, 0xc0, 0, 0,
 447                                  transfer_buffer,
 448                                  sizeof(struct qt_get_device_data), 300);
 449         if (result > 0)
 450                 memcpy(device_data, transfer_buffer,
 451                        sizeof(struct qt_get_device_data));
 452         kfree(transfer_buffer);
 453
 454         return result;
 455 }
 456
 457 /****************************************************************************
 458  *  box_set_prebuffer_level
 459    TELLS BOX WHEN TO ASSERT FLOW CONTROL
 460  ****************************************************************************/
 461 static int box_set_prebuffer_level(struct usb_serial *serial)
 462 {
 463         int result;
 464         __u16 buffer_length;
 465
 466         buffer_length = PREFUFF_LEVEL_CONSERVATIVE;
 467         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 468                                  QT_GET_SET_PREBUF_TRIG_LVL, 0x40,
 469                                  buffer_length, 0, NULL, 0, 300);
 470         return result;
 471 }
 472
 473 /****************************************************************************
 474  *  box_set_atc
 475    TELLS BOX WHEN TO ASSERT automatic transmitter control
 476    ****************************************************************************/
 477 static int box_set_atc(struct usb_serial *serial, __u16 n_mode)
 478 {
 479         int result;
 480         __u16 buffer_length;
 481
 482         buffer_length = PREFUFF_LEVEL_CONSERVATIVE;
 483
 484         result =
 485             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 486                             QT_SET_ATF, 0x40, n_mode, 0, NULL, 0, 300);
 487
 488         return result;
 489 }
 490
 491 /**
 492  * qt_set_device
 493  *   Issue a SET_DEVICE vendor-specific request on the default control pipe If
 494  *   successful returns the number of bytes written, otherwise it returns a
 495  *   negative error number of the problem.
 496  */
 497 static int qt_set_device(struct usb_serial *serial,
 498                          struct qt_get_device_data *device_data)
 499 {
 500         int result;
 501         __u16 length;
 502         __u16 port_settings;
 503
 504         port_settings = ((__u16) (device_data->portb));
 505         port_settings = (port_settings << 8);
 506         port_settings += ((__u16) (device_data->porta));
 507
 508         length = sizeof(struct qt_get_device_data);
 509
 510         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 511                                  QT_SET_GET_DEVICE, 0x40, port_settings,
 512                                  0, NULL, 0, 300);
 513         return result;
 514 }
 515
 516 static int qt_open_channel(struct usb_serial *serial, __u16 uart_num,
 517                            struct qt_open_channel_data *pdevice_data)
 518 {
 519         int result;
 520
 521         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 522                                  QT_OPEN_CLOSE_CHANNEL,
 523                                  USBD_TRANSFER_DIRECTION_IN, 1, uart_num,
 524                                  pdevice_data,
 525                                  sizeof(struct qt_open_channel_data), 300);
 526
 527         return result;
 528
 529 }
 530
 531 static int qt_close_channel(struct usb_serial *serial, __u16 uart_num)
 532 {
 533         int result;
 534
 535         result = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 536                                  QT_OPEN_CLOSE_CHANNEL,
 537                                  USBD_TRANSFER_DIRECTION_OUT, 0, uart_num,
 538                                  NULL, 0, 300);
 539
 540         return result;
 541
 542 }
 543
 544 /****************************************************************************
 545 * box_get_register
 546 *       issuse a GET_REGISTER vendor-spcific request on the default control pipe
 547 *       If successful, fills in the  p_value with the register value asked for
 548 ****************************************************************************/
 549 static int box_get_register(struct usb_serial *serial, unsigned short uart_num,
 550                           unsigned short register_num, __u8 *p_value)
 551 {
 552         int result;
 553         __u16 current_length;
 554
 555         current_length = sizeof(struct qt_get_device_data);
 556
 557         result =
 558             usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 559                             QT_GET_SET_REGISTER, 0xC0, register_num,
 560                             uart_num, (void *)p_value, sizeof(*p_value), 300);
 561
 562         return result;
 563 }
 564
 565 /****************************************************************************
 566 * box_set_register
 567 *       issuse a GET_REGISTER vendor-spcific request on the default control pipe
 568 *       If successful, fills in the  p_value with the register value asked for
 569 ****************************************************************************/
 570 static int box_set_register(struct usb_serial *serial, unsigned short uart_num,
 571                           unsigned short register_num, unsigned short value)
 572 {
 573         int result;
 574         unsigned short reg_and_byte;
 575
 576         reg_and_byte = value;
 577         reg_and_byte = reg_and_byte << 8;
 578         reg_and_byte = reg_and_byte + register_num;
 579
 580 /*
 581         result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 582                                  QT_GET_SET_REGISTER, 0xC0, register_num,
 583                                  uart_num, NULL, 0, 300);
 584 */
 585
 586         result =
 587             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 588                             QT_GET_SET_REGISTER, 0x40, reg_and_byte, uart_num,
 589                             NULL, 0, 300);
 590
 591         return result;
 592 }
 593
 594 /*
 595  * qt_setuart
 596  * issues a SET_UART vendor-specific request on the default control pipe
 597  * If successful sets baud rate divisor and LCR value
 598  */
 599 static int qt_setuart(struct usb_serial *serial, unsigned short uart_num,
 600                       unsigned short default_divisor, unsigned char default_lcr)
 601 {
 602         int result;
 603         unsigned short uart_num_and_lcr;
 604
 605         uart_num_and_lcr = (default_lcr << 8) + uart_num;
 606
 607         result =
 608             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 609                             QT_GET_SET_UART, 0x40, default_divisor,
 610                             uart_num_and_lcr, NULL, 0, 300);
 611
 612         return result;
 613 }
 614
 615 static int box_set_hw_flow_ctrl(struct usb_serial *serial, unsigned int index,
 616                              int b_set)
 617 {
 618         __u8 mcr = 0;
 619         __u8 msr = 0, mout_value = 0;
 620         unsigned int status;
 621
 622         if (b_set == 1) {
 623                 /* flow control, box will clear RTS line to prevent remote */
 624                 mcr = SERIAL_MCR_RTS;
 625         } /* device from xmitting more chars */
 626         else {
 627                 /* no flow control to remote device */
 628                 mcr = 0;
 629
 630         }
 631         mout_value = mcr << 8;
 632
 633         if (b_set == 1) {
 634                 /* flow control, box will inhibit xmit data if CTS line is
 635                  * asserted */
 636                 msr = SERIAL_MSR_CTS;
 637         } else {
 638                 /* Box will not inhimbe xmit data due to CTS line */
 639                 msr = 0;
 640         }
 641         mout_value |= msr;
 642
 643         status =
 644             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 645                             QT_HW_FLOW_CONTROL_MASK, 0x40, mout_value,
 646                             index, NULL, 0, 300);
 647         return status;
 648
 649 }
 650
 651 static int box_set_sw_flow_ctrl(struct usb_serial *serial, __u16 index,
 652                              unsigned char stop_char, unsigned char start_char)
 653 {
 654         __u16 n_sw_flow_out;
 655         int result;
 656
 657         n_sw_flow_out = start_char << 8;
 658         n_sw_flow_out = (unsigned short)stop_char;
 659
 660         result =
 661             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 662                             QT_SW_FLOW_CONTROL_MASK, 0x40, n_sw_flow_out,
 663                             index, NULL, 0, 300);
 664         return result;
 665
 666 }
 667
 668 static int box_disable_sw_flow_ctrl(struct usb_serial *serial, __u16 index)
 669 {
 670         int result;
 671
 672         result =
 673             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 674                             QT_SW_FLOW_CONTROL_DISABLE, 0x40, 0, index,
 675                             NULL, 0, 300);
 676         return result;
 677
 678 }
 679
 680 static int qt_startup(struct usb_serial *serial)
 681 {
 682         struct device *dev = &serial->dev->dev;
 683         struct usb_serial_port *port;
 684         struct quatech_port *qt_port;
 685         struct qt_get_device_data device_data;
 686         int i;
 687         int status;
 688
 689         /* Now setup per port private data */
 690         for (i = 0; i < serial->num_ports; i++) {
 691                 port = serial->port[i];
 692                 qt_port = kzalloc(sizeof(*qt_port), GFP_KERNEL);
 693                 if (!qt_port) {
 694                         for (--i; i >= 0; i--) {
 695                                 port = serial->port[i];
 696                                 kfree(usb_get_serial_port_data(port));
 697                                 usb_set_serial_port_data(port, NULL);
 698                         }
 699                         return -ENOMEM;
 700                 }
 701                 mutex_init(&qt_port->lock);
 702
 703                 usb_set_serial_port_data(port, qt_port);
 704
 705         }
 706
 707         status = qt_get_device(serial, &device_data);
 708         if (status < 0)
 709                 goto startup_error;
 710
 711         dev_dbg(dev, "device_data.portb = 0x%x\n", device_data.portb);
 712
 713         device_data.portb &= ~FULLPWRBIT;
 714         dev_dbg(dev, "Changing device_data.portb to 0x%x\n", device_data.portb);
 715
 716         status = qt_set_device(serial, &device_data);
 717         if (status < 0) {
 718                 dev_dbg(dev, "qt_set_device failed\n");
 719                 goto startup_error;
 720         }
 721
 722         status = qt_get_device(serial, &device_data);
 723         if (status < 0) {
 724                 dev_dbg(dev, "qt_get_device failed\n");
 725                 goto startup_error;
 726         }
 727
 728         switch (serial->dev->descriptor.idProduct) {
 729         case QUATECH_DSU100:
 730         case QUATECH_QSU100:
 731         case QUATECH_ESU100A:
 732         case QUATECH_ESU100B:
 733         case QUATECH_HSU100A:
 734         case QUATECH_HSU100B:
 735         case QUATECH_HSU100C:
 736         case QUATECH_HSU100D:
 737                 device_data.porta &= ~(RR_BITS | DUPMODE_BITS);
 738                 device_data.porta |= CLKS_X4;
 739                 device_data.portb &= ~(LOOPMODE_BITS);
 740                 device_data.portb |= RS232_MODE;
 741                 break;
 742
 743         case QUATECH_SSU200:
 744         case QUATECH_DSU200:
 745         case QUATECH_QSU200:
 746         case QUATECH_ESU200A:
 747         case QUATECH_ESU200B:
 748         case QUATECH_HSU200A:
 749         case QUATECH_HSU200B:
 750         case QUATECH_HSU200C:
 751         case QUATECH_HSU200D:
 752                 device_data.porta &= ~(RR_BITS | DUPMODE_BITS);
 753                 device_data.porta |= CLKS_X4;
 754                 device_data.portb &= ~(LOOPMODE_BITS);
 755                 device_data.portb |= ALL_LOOPBACK;
 756                 break;
 757         default:
 758                 device_data.porta &= ~(RR_BITS | DUPMODE_BITS);
 759                 device_data.porta |= CLKS_X4;
 760                 device_data.portb &= ~(LOOPMODE_BITS);
 761                 device_data.portb |= RS232_MODE;
 762                 break;
 763
 764         }
 765
 766         status = box_set_prebuffer_level(serial);       /* sets to default value */
 767         if (status < 0) {
 768                 dev_dbg(dev, "box_set_prebuffer_level failed\n");
 769                 goto startup_error;
 770         }
 771
 772         status = box_set_atc(serial, ATC_DISABLED);
 773         if (status < 0) {
 774                 dev_dbg(dev, "box_set_atc failed\n");
 775                 goto startup_error;
 776         }
 777
 778         dev_dbg(dev, "device_data.portb = 0x%x\n", device_data.portb);
 779
 780         device_data.portb |= NEXT_BOARD_POWER_BIT;
 781         dev_dbg(dev, "Changing device_data.portb to 0x%x\n", device_data.portb);
 782
 783         status = qt_set_device(serial, &device_data);
 784         if (status < 0) {
 785                 dev_dbg(dev, "qt_set_device failed\n");
 786                 goto startup_error;
 787         }
 788
 789         return 0;
 790
 791 startup_error:
 792         for (i = 0; i < serial->num_ports; i++) {
 793                 port = serial->port[i];
 794                 qt_port = qt_get_port_private(port);
 795                 kfree(qt_port);
 796                 usb_set_serial_port_data(port, NULL);
 797         }
 798
 799         return -EIO;
 800 }
 801
 802 static void qt_release(struct usb_serial *serial)
 803 {
 804         struct usb_serial_port *port;
 805         struct quatech_port *qt_port;
 806         int i;
 807
 808         for (i = 0; i < serial->num_ports; i++) {
 809                 port = serial->port[i];
 810                 if (!port)
 811                         continue;
 812
 813                 qt_port = usb_get_serial_port_data(port);
 814                 kfree(qt_port);
 815                 usb_set_serial_port_data(port, NULL);
 816         }
 817
 818 }
 819
 820 static void qt_submit_urb_from_open(struct usb_serial *serial,
 821                                     struct usb_serial_port *port)
 822 {
 823         int result;
 824         struct usb_serial_port *port0 = serial->port[0];
 825
 826         /* set up interrupt urb */
 827         usb_fill_int_urb(port0->interrupt_in_urb,
 828                          serial->dev,
 829                          usb_rcvintpipe(serial->dev,
 830                                         port0->interrupt_in_endpointAddress),
 831                          port0->interrupt_in_buffer,
 832                          port0->interrupt_in_urb->transfer_buffer_length,
 833                          qt_interrupt_callback, serial,
 834                          port0->interrupt_in_urb->interval);
 835
 836         result = usb_submit_urb(port0->interrupt_in_urb,
 837                                 GFP_KERNEL);
 838         if (result) {
 839                 dev_err(&port->dev,
 840                         "%s - Error %d submitting interrupt urb\n",
 841                         __func__, result);
 842         }
 843 }
 844
 845 static int qt_open(struct tty_struct *tty,
 846                    struct usb_serial_port *port)
 847 {
 848         struct usb_serial *serial;
 849         struct quatech_port *quatech_port;
 850         struct quatech_port *port0;
 851         struct qt_open_channel_data channel_data;
 852
 853         int result;
 854
 855         if (port_paranoia_check(port, __func__))
 856                 return -ENODEV;
 857
 858         serial = port->serial;
 859
 860         if (serial_paranoia_check(serial, __func__))
 861                 return -ENODEV;
 862
 863         quatech_port = qt_get_port_private(port);
 864         port0 = qt_get_port_private(serial->port[0]);
 865
 866         if (quatech_port == NULL || port0 == NULL)
 867                 return -ENODEV;
 868
 869         usb_clear_halt(serial->dev, port->write_urb->pipe);
 870         usb_clear_halt(serial->dev, port->read_urb->pipe);
 871         port0->open_ports++;
 872
 873         result = qt_get_device(serial, &port0->device_data);
 874
 875         /* Port specific setups */
 876         result = qt_open_channel(serial, port->port_number, &channel_data);
 877         if (result < 0) {
 878                 dev_dbg(&port->dev, "qt_open_channel failed\n");
 879                 return result;
 880         }
 881         dev_dbg(&port->dev, "qt_open_channel completed.\n");
 882
 883 /* FIXME: are these needed?  Does it even do anything useful? */
 884         quatech_port->shadow_lsr = channel_data.line_status &
 885             (SERIAL_LSR_OE | SERIAL_LSR_PE | SERIAL_LSR_FE | SERIAL_LSR_BI);
 886
 887         quatech_port->shadow_msr = channel_data.modem_status &
 888             (SERIAL_MSR_CTS | SERIAL_MSR_DSR | SERIAL_MSR_RI | SERIAL_MSR_CD);
 889
 890         /* Set Baud rate to default and turn off (default)flow control here */
 891         result = qt_setuart(serial, port->port_number, DEFAULT_DIVISOR, DEFAULT_LCR);
 892         if (result < 0) {
 893                 dev_dbg(&port->dev, "qt_setuart failed\n");
 894                 return result;
 895         }
 896         dev_dbg(&port->dev, "qt_setuart completed.\n");
 897
 898         /*
 899          * Put this here to make it responsive to stty and defaults set by
 900          * the tty layer
 901          */
 902
 903         /*  Check to see if we've set up our endpoint info yet */
 904         if (port0->open_ports == 1) {
 905                 if (serial->port[0]->interrupt_in_buffer == NULL)
 906                         qt_submit_urb_from_open(serial, port);
 907         }
 908
 909         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
 910         dev_dbg(&port->dev,
 911                 "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
 912         dev_dbg(&port->dev,
 913                 "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
 914         dev_dbg(&port->dev, "Interrupt endpoint is %d\n",
 915                 port->interrupt_in_endpointAddress);
 916         dev_dbg(&port->dev, "port's number in the device is %d\n",
 917                 quatech_port->port_num);
 918         quatech_port->read_urb = port->read_urb;
 919
 920         /* set up our bulk in urb */
 921
 922         usb_fill_bulk_urb(quatech_port->read_urb,
 923                           serial->dev,
 924                           usb_rcvbulkpipe(serial->dev,
 925                                           port->bulk_in_endpointAddress),
 926                           port->bulk_in_buffer,
 927                           quatech_port->read_urb->transfer_buffer_length,
 928                           qt_read_bulk_callback, quatech_port);
 929
 930         dev_dbg(&port->dev, "qt_open: bulkin endpoint is %d\n",
 931                 port->bulk_in_endpointAddress);
 932         quatech_port->read_urb_busy = true;
 933         result = usb_submit_urb(quatech_port->read_urb, GFP_KERNEL);
 934         if (result) {
 935                 dev_err(&port->dev,
 936                         "%s - Error %d submitting control urb\n",
 937                         __func__, result);
 938                 quatech_port->read_urb_busy = false;
 939         }
 940
 941         /* initialize our wait queues */
 942         init_waitqueue_head(&quatech_port->wait);
 943         init_waitqueue_head(&quatech_port->msr_wait);
 944
 945         /* initialize our icount structure */
 946         memset(&(quatech_port->icount), 0x00, sizeof(quatech_port->icount));
 947
 948         return 0;
 949
 950 }
 951
 952 static int qt_chars_in_buffer(struct tty_struct *tty)
 953 {
 954         struct usb_serial_port *port = tty->driver_data;
 955         struct usb_serial *serial;
 956         int chars = 0;
 957
 958         serial = get_usb_serial(port, __func__);
 959
 960         if (serial->num_bulk_out) {
 961                 if (port->write_urb->status == -EINPROGRESS)
 962                         chars = port->write_urb->transfer_buffer_length;
 963         }
 964
 965         return chars;
 966 }
 967
 968 static void qt_block_until_empty(struct tty_struct *tty,
 969                                  struct quatech_port *qt_port)
 970 {
 971         int timeout = HZ / 10;
 972         int wait = 30;
 973         int count;
 974
 975         while (1) {
 976
 977                 count = qt_chars_in_buffer(tty);
 978
 979                 if (count <= 0)
 980                         return;
 981
 982                 interruptible_sleep_on_timeout(&qt_port->wait, timeout);
 983
 984                 wait--;
 985                 if (wait == 0) {
 986                         dev_dbg(&qt_port->port->dev, "%s - TIMEOUT", __func__);
 987                         return;
 988                 } else {
 989                         wait = 30;
 990                 }
 991         }
 992 }
 993
 994 static void qt_close(struct usb_serial_port *port)
 995 {
 996         struct usb_serial *serial = port->serial;
 997         struct quatech_port *qt_port;
 998         struct quatech_port *port0;
 999         struct tty_struct *tty;
1000         int status;
1001         unsigned int index;
1002         status = 0;
1003
1004         tty = tty_port_tty_get(&port->port);
1005         index = port->port_number;
1006
1007         qt_port = qt_get_port_private(port);
1008         port0 = qt_get_port_private(serial->port[0]);
1009
1010         /* shutdown any bulk reads that might be going on */
1011         if (serial->num_bulk_out)
1012                 usb_unlink_urb(port->write_urb);
1013         if (serial->num_bulk_in)
1014                 usb_unlink_urb(port->read_urb);
1015
1016         /* wait up to for transmitter to empty */
1017         if (serial->dev)
1018                 qt_block_until_empty(tty, qt_port);
1019         tty_kref_put(tty);
1020
1021         /* Close uart channel */
1022         status = qt_close_channel(serial, index);
1023         if (status < 0)
1024                 dev_dbg(&port->dev, "%s - qt_close_channel failed.\n", __func__);
1025
1026         port0->open_ports--;
1027
1028         dev_dbg(&port->dev, "qt_num_open_ports in close%d\n", port0->open_ports);
1029
1030         if (port0->open_ports == 0) {
1031                 if (serial->port[0]->interrupt_in_urb) {
1032                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1033                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1034                 }
1035
1036         }
1037
1038         if (qt_port->write_urb) {
1039                 /* if this urb had a transfer buffer already (old tx) free it */
1040                 kfree(qt_port->write_urb->transfer_buffer);
1041                 usb_free_urb(qt_port->write_urb);
1042         }
1043
1044 }
1045
1046 static int qt_write(struct tty_struct *tty, struct usb_serial_port *port,
1047                     const unsigned char *buf, int count)
1048 {
1049         int result;
1050         struct usb_serial *serial = get_usb_serial(port, __func__);
1051
1052         if (serial == NULL)
1053                 return -ENODEV;
1054
1055         if (count == 0) {
1056                 dev_dbg(&port->dev,
1057                         "%s - write request of 0 bytes\n", __func__);
1058                 return 0;
1059         }
1060
1061         /* only do something if we have a bulk out endpoint */
1062         if (serial->num_bulk_out) {
1063                 if (port->write_urb->status == -EINPROGRESS) {
1064                         dev_dbg(&port->dev, "%s - already writing\n", __func__);
1065                         return 0;
1066                 }
1067
1068                 count =
1069                     (count > port->bulk_out_size) ? port->bulk_out_size : count;
1070                 memcpy(port->write_urb->transfer_buffer, buf, count);
1071
1072                 /* set up our urb */
1073
1074                 usb_fill_bulk_urb(port->write_urb, serial->dev,
1075                                   usb_sndbulkpipe(serial->dev,
1076                                                   port->
1077                                                   bulk_out_endpointAddress),
1078                                   port->write_urb->transfer_buffer, count,
1079                                   qt_write_bulk_callback, port);
1080
1081                 /* send the data out the bulk port */
1082                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
1083                 if (result)
1084                         dev_dbg(&port->dev,
1085                                 "%s - failed submitting write urb, error %d\n",
1086                                 __func__, result);
1087                 else
1088                         result = count;
1089
1090                 return result;
1091         }
1092
1093         /* no bulk out, so return 0 bytes written */
1094         return 0;
1095 }
1096
1097 static int qt_write_room(struct tty_struct *tty)
1098 {
1099         struct usb_serial_port *port = tty->driver_data;
1100         struct usb_serial *serial;
1101         struct quatech_port *qt_port;
1102
1103         int retval = -EINVAL;
1104
1105         if (port_paranoia_check(port, __func__))
1106                 return -1;
1107
1108         serial = get_usb_serial(port, __func__);
1109
1110         if (!serial)
1111                 return -ENODEV;
1112
1113         qt_port = qt_get_port_private(port);
1114
1115         mutex_lock(&qt_port->lock);
1116
1117         if (serial->num_bulk_out) {
1118                 if (port->write_urb->status != -EINPROGRESS)
1119                         retval = port->bulk_out_size;
1120         }
1121
1122         mutex_unlock(&qt_port->lock);
1123         return retval;
1124
1125 }
1126
1127 static int qt_ioctl(struct tty_struct *tty,
1128                     unsigned int cmd, unsigned long arg)
1129 {
1130         struct usb_serial_port *port = tty->driver_data;
1131         struct quatech_port *qt_port = qt_get_port_private(port);
1132         unsigned int index;
1133
1134         dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
1135
1136         index = port->port_number;
1137
1138         if (cmd == TIOCMIWAIT) {
1139                 while (qt_port != NULL) {
1140                         interruptible_sleep_on(&qt_port->msr_wait);
1141                         if (signal_pending(current))
1142                                 return -ERESTARTSYS;
1143                         else {
1144                                 char diff = qt_port->diff_status;
1145
1146                                 if (diff == 0)
1147                                         return -EIO;    /* no change => error */
1148
1149                                 /* Consume all events */
1150                                 qt_port->diff_status = 0;
1151
1152                                 if (((arg & TIOCM_RNG)
1153                                      && (diff & SERIAL_MSR_RI))
1154                                     || ((arg & TIOCM_DSR)
1155                                         && (diff & SERIAL_MSR_DSR))
1156                                     || ((arg & TIOCM_CD)
1157                                         && (diff & SERIAL_MSR_CD))
1158                                     || ((arg & TIOCM_CTS)
1159                                         && (diff & SERIAL_MSR_CTS))) {
1160                                         return 0;
1161                                 }
1162                         }
1163                 }
1164                 return 0;
1165         }
1166
1167         dev_dbg(&port->dev, "%s -No ioctl for that one.\n", __func__);
1168         return -ENOIOCTLCMD;
1169 }
1170
1171 static void qt_set_termios(struct tty_struct *tty,
1172                            struct usb_serial_port *port,
1173                            struct ktermios *old_termios)
1174 {
1175         struct ktermios *termios = &tty->termios;
1176         unsigned char new_lcr = 0;
1177         unsigned int cflag = termios->c_cflag;
1178         unsigned int index;
1179         int baud, divisor, remainder;
1180         int status;
1181
1182         index = port->port_number;
1183
1184         switch (cflag & CSIZE) {
1185         case CS5:
1186                 new_lcr |= SERIAL_5_DATA;
1187                 break;
1188         case CS6:
1189                 new_lcr |= SERIAL_6_DATA;
1190                 break;
1191         case CS7:
1192                 new_lcr |= SERIAL_7_DATA;
1193                 break;
1194         default:
1195                 termios->c_cflag &= ~CSIZE;
1196                 termios->c_cflag |= CS8;
1197         case CS8:
1198                 new_lcr |= SERIAL_8_DATA;
1199                 break;
1200         }
1201
1202         /* Parity stuff */
1203         if (cflag & PARENB) {
1204                 if (cflag & PARODD)
1205                         new_lcr |= SERIAL_ODD_PARITY;
1206                 else
1207                         new_lcr |= SERIAL_EVEN_PARITY;
1208         }
1209         if (cflag & CSTOPB)
1210                 new_lcr |= SERIAL_TWO_STOPB;
1211         else
1212                 new_lcr |= SERIAL_ONE_STOPB;
1213
1214         dev_dbg(&port->dev, "%s - 4\n", __func__);
1215
1216         /* Thats the LCR stuff, go ahead and set it */
1217         baud = tty_get_baud_rate(tty);
1218         if (!baud)
1219                 /* pick a default, any default... */
1220                 baud = 9600;
1221
1222         dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud);
1223
1224         divisor = MAX_BAUD_RATE / baud;
1225         remainder = MAX_BAUD_RATE % baud;
1226         /* Round to nearest divisor */
1227         if (((remainder * 2) >= baud) && (baud != 110))
1228                 divisor++;
1229
1230         /*
1231          * Set Baud rate to default and turn off (default)flow control here
1232          */
1233         status =
1234             qt_setuart(port->serial, index, (unsigned short)divisor, new_lcr);
1235         if (status < 0) {
1236                 dev_dbg(&port->dev, "qt_setuart failed\n");
1237                 return;
1238         }
1239
1240         /* Now determine flow control */
1241         if (cflag & CRTSCTS) {
1242                 dev_dbg(&port->dev, "%s - Enabling HW flow control\n", __func__);
1243
1244                 /* Enable RTS/CTS flow control */
1245                 status = box_set_hw_flow_ctrl(port->serial, index, 1);
1246
1247                 if (status < 0) {
1248                         dev_dbg(&port->dev, "box_set_hw_flow_ctrl failed\n");
1249                         return;
1250                 }
1251         } else {
1252                 /* Disable RTS/CTS flow control */
1253                 dev_dbg(&port->dev,
1254                         "%s - disabling HW flow control\n", __func__);
1255
1256                 status = box_set_hw_flow_ctrl(port->serial, index, 0);
1257                 if (status < 0) {
1258                         dev_dbg(&port->dev, "box_set_hw_flow_ctrl failed\n");
1259                         return;
1260                 }
1261
1262         }
1263
1264         /* if we are implementing XON/XOFF, set the start and stop character in
1265          * the device */
1266         if (I_IXOFF(tty) || I_IXON(tty)) {
1267                 unsigned char stop_char = STOP_CHAR(tty);
1268                 unsigned char start_char = START_CHAR(tty);
1269                 status =
1270                     box_set_sw_flow_ctrl(port->serial, index, stop_char,
1271                                       start_char);
1272                 if (status < 0)
1273                         dev_dbg(&port->dev,
1274                                 "box_set_sw_flow_ctrl (enabled) failed\n");
1275
1276         } else {
1277                 /* disable SW flow control */
1278                 status = box_disable_sw_flow_ctrl(port->serial, index);
1279                 if (status < 0)
1280                         dev_dbg(&port->dev,
1281                                 "box_set_sw_flow_ctrl (diabling) failed\n");
1282
1283         }
1284         termios->c_cflag &= ~CMSPAR;
1285         /* FIXME:
1286            Error cases should be returning the actual bits changed only
1287         */
1288 }
1289
1290 static void qt_break(struct tty_struct *tty, int break_state)
1291 {
1292         struct usb_serial_port *port = tty->driver_data;
1293         struct usb_serial *serial = get_usb_serial(port, __func__);
1294         struct quatech_port *qt_port;
1295         u16 index, onoff;
1296         unsigned int result;
1297
1298         index = port->port_number;
1299
1300         qt_port = qt_get_port_private(port);
1301
1302         if (break_state == -1)
1303                 onoff = 1;
1304         else
1305                 onoff = 0;
1306
1307         mutex_lock(&qt_port->lock);
1308
1309         result =
1310             usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1311                             QT_BREAK_CONTROL, 0x40, onoff, index, NULL, 0, 300);
1312
1313         mutex_unlock(&qt_port->lock);
1314 }
1315
1316 static inline int qt_real_tiocmget(struct tty_struct *tty,
1317                                    struct usb_serial_port *port,
1318                                    struct usb_serial *serial)
1319 {
1320
1321         u8 mcr;
1322         u8 msr;
1323         unsigned int result = 0;
1324         int status;
1325         unsigned int index;
1326
1327         index = port->port_number;
1328         status =
1329             box_get_register(port->serial, index, MODEM_CONTROL_REGISTER, &mcr);
1330         if (status >= 0) {
1331                 status =
1332                     box_get_register(port->serial, index,
1333                                    MODEM_STATUS_REGISTER, &msr);
1334
1335         }
1336
1337         if (status >= 0) {
1338                 result = ((mcr & SERIAL_MCR_DTR) ? TIOCM_DTR : 0)
1339                     /* DTR IS SET */
1340                     | ((mcr & SERIAL_MCR_RTS) ? TIOCM_RTS : 0)
1341                     /* RTS IS SET */
1342                     | ((msr & SERIAL_MSR_CTS) ? TIOCM_CTS : 0)
1343                     /* CTS is set */
1344                     | ((msr & SERIAL_MSR_CD) ? TIOCM_CAR : 0)
1345                     /* Carrier detect is set */
1346                     | ((msr & SERIAL_MSR_RI) ? TIOCM_RI : 0)
1347                     /* Ring indicator set */
1348                     | ((msr & SERIAL_MSR_DSR) ? TIOCM_DSR : 0);
1349                 /* DSR is set */
1350                 return result;
1351
1352         } else
1353                 return -ESPIPE;
1354 }
1355
1356 static inline int qt_real_tiocmset(struct tty_struct *tty,
1357                                    struct usb_serial_port *port,
1358                                    struct usb_serial *serial,
1359                                    unsigned int value)
1360 {
1361
1362         u8 mcr;
1363         int status;
1364         unsigned int index;
1365
1366         index = port->port_number;
1367         status =
1368             box_get_register(port->serial, index, MODEM_CONTROL_REGISTER, &mcr);
1369         if (status < 0)
1370                 return -ESPIPE;
1371
1372         /*
1373          * Turn off the RTS and DTR and loopback and then only turn on what was
1374          * asked for
1375          */
1376         mcr &= ~(SERIAL_MCR_RTS | SERIAL_MCR_DTR | SERIAL_MCR_LOOP);
1377         if (value & TIOCM_RTS)
1378                 mcr |= SERIAL_MCR_RTS;
1379         if (value & TIOCM_DTR)
1380                 mcr |= SERIAL_MCR_DTR;
1381         if (value & TIOCM_LOOP)
1382                 mcr |= SERIAL_MCR_LOOP;
1383
1384         status =
1385             box_set_register(port->serial, index, MODEM_CONTROL_REGISTER, mcr);
1386         if (status < 0)
1387                 return -ESPIPE;
1388         else
1389                 return 0;
1390 }
1391
1392 static int qt_tiocmget(struct tty_struct *tty)
1393 {
1394         struct usb_serial_port *port = tty->driver_data;
1395         struct usb_serial *serial = get_usb_serial(port, __func__);
1396         struct quatech_port *qt_port = qt_get_port_private(port);
1397         int retval;
1398
1399         if (!serial)
1400                 return -ENODEV;
1401
1402         mutex_lock(&qt_port->lock);
1403         retval = qt_real_tiocmget(tty, port, serial);
1404         mutex_unlock(&qt_port->lock);
1405         return retval;
1406 }
1407
1408 static int qt_tiocmset(struct tty_struct *tty,
1409                        unsigned int set, unsigned int clear)
1410 {
1411
1412         struct usb_serial_port *port = tty->driver_data;
1413         struct usb_serial *serial = get_usb_serial(port, __func__);
1414         struct quatech_port *qt_port = qt_get_port_private(port);
1415         int retval;
1416
1417         if (!serial)
1418                 return -ENODEV;
1419
1420         mutex_lock(&qt_port->lock);
1421         retval = qt_real_tiocmset(tty, port, serial, set);
1422         mutex_unlock(&qt_port->lock);
1423         return retval;
1424 }
1425
1426 static void qt_throttle(struct tty_struct *tty)
1427 {
1428         struct usb_serial_port *port = tty->driver_data;
1429         struct usb_serial *serial = get_usb_serial(port, __func__);
1430         struct quatech_port *qt_port;
1431
1432         if (!serial)
1433                 return;
1434
1435         qt_port = qt_get_port_private(port);
1436
1437         mutex_lock(&qt_port->lock);
1438
1439         /* pass on to the driver specific version of this function */
1440         qt_port->rx_holding = 1;
1441
1442         mutex_unlock(&qt_port->lock);
1443 }
1444
1445 static void qt_submit_urb_from_unthrottle(struct usb_serial_port *port,
1446                                           struct usb_serial *serial)
1447 {
1448         int result;
1449
1450         /* Start reading from the device */
1451         usb_fill_bulk_urb(port->read_urb, serial->dev,
1452                           usb_rcvbulkpipe(serial->dev,
1453                                           port->bulk_in_endpointAddress),
1454                           port->read_urb->transfer_buffer,
1455                           port->read_urb->transfer_buffer_length,
1456                           qt_read_bulk_callback, port);
1457
1458         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1459
1460         if (result)
1461                 dev_err(&port->dev,
1462                         "%s - failed restarting read urb, error %d\n",
1463                         __func__, result);
1464 }
1465
1466 static void qt_unthrottle(struct tty_struct *tty)
1467 {
1468         struct usb_serial_port *port = tty->driver_data;
1469         struct usb_serial *serial = get_usb_serial(port, __func__);
1470         struct quatech_port *qt_port;
1471
1472         if (!serial)
1473                 return;
1474
1475         qt_port = qt_get_port_private(port);
1476
1477         mutex_lock(&qt_port->lock);
1478
1479         if (qt_port->rx_holding == 1) {
1480                 dev_dbg(&port->dev, "%s -qt_port->rx_holding == 1\n", __func__);
1481
1482                 qt_port->rx_holding = 0;
1483                 dev_dbg(&port->dev, "%s - qt_port->rx_holding = 0\n", __func__);
1484
1485                 /* if we have a bulk endpoint, start it up */
1486                 if ((serial->num_bulk_in) && (qt_port->read_bulk_stopped == 1))
1487                         qt_submit_urb_from_unthrottle(port, serial);
1488         }
1489         mutex_unlock(&qt_port->lock);
1490 }
1491
1492 static int qt_calc_num_ports(struct usb_serial *serial)
1493 {
1494         int num_ports;
1495
1496         num_ports =
1497             (serial->interface->cur_altsetting->desc.bNumEndpoints - 1) / 2;
1498
1499         return num_ports;
1500 }
1501
1502 static struct usb_serial_driver quatech_device = {
1503         .driver = {
1504                    .owner = THIS_MODULE,
1505                    .name = "serqt",
1506                    },
1507         .description = DRIVER_DESC,
1508         .id_table = id_table,
1509         .num_ports = 8,
1510         .open = qt_open,
1511         .close = qt_close,
1512         .write = qt_write,
1513         .write_room = qt_write_room,
1514         .chars_in_buffer = qt_chars_in_buffer,
1515         .throttle = qt_throttle,
1516         .unthrottle = qt_unthrottle,
1517         .calc_num_ports = qt_calc_num_ports,
1518         .ioctl = qt_ioctl,
1519         .set_termios = qt_set_termios,
1520         .break_ctl = qt_break,
1521         .tiocmget = qt_tiocmget,
1522         .tiocmset = qt_tiocmset,
1523         .attach = qt_startup,
1524         .release = qt_release,
1525 };
1526
1527 static struct usb_serial_driver * const serial_drivers[] = {
1528         &quatech_device, NULL
1529 };
1530
1531 module_usb_serial_driver(serial_drivers, id_table);
1532
1533 MODULE_AUTHOR(DRIVER_AUTHOR);
1534 MODULE_DESCRIPTION(DRIVER_DESC);
1535 MODULE_LICENSE("GPL");