drivers/usb/serial/quatech2.c

   1 /*
   2  * usb-serial driver for Quatech USB 2 devices
   3  *
   4  * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  *
  11  *  These devices all have only 1 bulk in and 1 bulk out that is shared
  12  *  for all serial ports.
  13  *
  14  */
  15
  16 #include <asm/unaligned.h>
  17 #include <linux/errno.h>
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/tty.h>
  21 #include <linux/tty_driver.h>
  22 #include <linux/tty_flip.h>
  23 #include <linux/module.h>
  24 #include <linux/serial.h>
  25 #include <linux/usb.h>
  26 #include <linux/usb/serial.h>
  27 #include <linux/serial_reg.h>
  28 #include <linux/uaccess.h>
  29
  30 static bool debug;
  31
  32 /* default urb timeout for usb operations */
  33 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
  34
  35 #define QT_OPEN_CLOSE_CHANNEL       0xca
  36 #define QT_SET_GET_DEVICE           0xc2
  37 #define QT_SET_GET_REGISTER         0xc0
  38 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  39 #define QT_SET_ATF                  0xcd
  40 #define QT_TRANSFER_IN              0xc0
  41 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  42 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  43 #define QT2_BREAK_CONTROL           0xc8
  44 #define QT2_GET_SET_UART            0xc1
  45 #define QT2_FLUSH_DEVICE            0xc4
  46 #define QT2_GET_SET_QMCR            0xe1
  47 #define QT2_QMCR_RS232              0x40
  48 #define QT2_QMCR_RS422              0x10
  49
  50 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
  51
  52 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
  53
  54 /* status bytes for the device */
  55 #define QT2_CONTROL_BYTE    0x1b
  56 #define QT2_LINE_STATUS     0x00  /* following 1 byte is line status */
  57 #define QT2_MODEM_STATUS    0x01  /* following 1 byte is modem status */
  58 #define QT2_XMIT_HOLD       0x02  /* following 2 bytes are ?? */
  59 #define QT2_CHANGE_PORT     0x03  /* following 1 byte is port to change to */
  60 #define QT2_REC_FLUSH       0x04  /* no following info */
  61 #define QT2_XMIT_FLUSH      0x05  /* no following info */
  62 #define QT2_CONTROL_ESCAPE  0xff  /* pass through previous 2 control bytes */
  63
  64 #define  MAX_BAUD_RATE              921600
  65 #define  DEFAULT_BAUD_RATE          9600
  66
  67 #define QT2_WRITE_BUFFER_SIZE   512  /* size of write buffer */
  68 #define QT2_WRITE_CONTROL_SIZE  5    /* control bytes used for a write */
  69
  70 /* Version Information */
  71 #define DRIVER_VERSION "v0.1"
  72 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
  73
  74 #define USB_VENDOR_ID_QUATECH   0x061d
  75 #define QUATECH_SSU2_100        0xC120  /* RS232 single port */
  76 #define QUATECH_DSU2_100        0xC140  /* RS232 dual port */
  77 #define QUATECH_DSU2_400        0xC150  /* RS232/422/485 dual port */
  78 #define QUATECH_QSU2_100        0xC160  /* RS232 four port */
  79 #define QUATECH_QSU2_400        0xC170  /* RS232/422/485 four port */
  80 #define QUATECH_ESU2_100        0xC1A0  /* RS232 eight port */
  81 #define QUATECH_ESU2_400        0xC180  /* RS232/422/485 eight port */
  82
  83 struct qt2_device_detail {
  84         int product_id;
  85         int num_ports;
  86 };
  87
  88 #define QT_DETAILS(prod, ports) \
  89         .product_id = (prod),   \
  90         .num_ports = (ports)
  91
  92 static const struct qt2_device_detail qt2_device_details[] = {
  93         {QT_DETAILS(QUATECH_SSU2_100, 1)},
  94         {QT_DETAILS(QUATECH_DSU2_400, 2)},
  95         {QT_DETAILS(QUATECH_DSU2_100, 2)},
  96         {QT_DETAILS(QUATECH_QSU2_400, 4)},
  97         {QT_DETAILS(QUATECH_QSU2_100, 4)},
  98         {QT_DETAILS(QUATECH_ESU2_400, 8)},
  99         {QT_DETAILS(QUATECH_ESU2_100, 8)},
 100         {QT_DETAILS(0, 0)}      /* Terminating entry */
 101 };
 102
 103 static const struct usb_device_id id_table[] = {
 104         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
 105         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
 106         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
 107         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
 108         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
 109         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
 110         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
 111         {}                      /* Terminating entry */
 112 };
 113 MODULE_DEVICE_TABLE(usb, id_table);
 114
 115 struct qt2_serial_private {
 116         unsigned char current_port;  /* current port for incoming data */
 117
 118         struct urb      *read_urb;   /* shared among all ports */
 119         char            read_buffer[512];
 120 };
 121
 122 struct qt2_port_private {
 123         bool is_open;
 124         u8   device_port;
 125
 126         spinlock_t urb_lock;
 127         bool       urb_in_use;
 128         struct urb *write_urb;
 129         char       write_buffer[QT2_WRITE_BUFFER_SIZE];
 130
 131         spinlock_t  lock;
 132         u8          shadowLSR;
 133         u8          shadowMSR;
 134
 135         wait_queue_head_t   delta_msr_wait; /* Used for TIOCMIWAIT */
 136         struct async_icount icount;
 137
 138         struct usb_serial_port *port;
 139 };
 140
 141 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
 142 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
 143 static void qt2_write_bulk_callback(struct urb *urb);
 144 static void qt2_read_bulk_callback(struct urb *urb);
 145
 146 static void qt2_release(struct usb_serial *serial)
 147 {
 148         int i;
 149
 150         kfree(usb_get_serial_data(serial));
 151
 152         for (i = 0; i < serial->num_ports; i++)
 153                 kfree(usb_get_serial_port_data(serial->port[i]));
 154 }
 155
 156 static inline int calc_baud_divisor(int baudrate)
 157 {
 158         int divisor, rem;
 159
 160         divisor = MAX_BAUD_RATE / baudrate;
 161         rem = MAX_BAUD_RATE % baudrate;
 162         /* Round to nearest divisor */
 163         if (((rem * 2) >= baudrate) && (baudrate != 110))
 164                 divisor++;
 165
 166         return divisor;
 167 }
 168
 169 static inline int qt2_set_port_config(struct usb_device *dev,
 170                                       unsigned char port_number,
 171                                       u16 baudrate, u16 lcr)
 172 {
 173         int divisor = calc_baud_divisor(baudrate);
 174         u16 index = ((u16) (lcr << 8) | (u16) (port_number));
 175
 176         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 177                                QT2_GET_SET_UART, 0x40,
 178                                divisor, index, NULL, 0, QT2_USB_TIMEOUT);
 179 }
 180
 181 static inline int qt2_control_msg(struct usb_device *dev,
 182                                   u8 request, u16 data, u16 index)
 183 {
 184         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 185                                request, 0x40, data, index,
 186                                NULL, 0, QT2_USB_TIMEOUT);
 187 }
 188
 189 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
 190 {
 191         u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
 192
 193         return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
 194 }
 195
 196
 197 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
 198 {
 199         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 200                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
 201                                data, 3, QT2_USB_TIMEOUT);
 202 }
 203
 204 static inline int qt2_getregister(struct usb_device *dev,
 205                                   u8 uart,
 206                                   u8 reg,
 207                                   u8 *data)
 208 {
 209         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 210                                QT_SET_GET_REGISTER, 0xc0, reg,
 211                                uart, data, sizeof(*data), QT2_USB_TIMEOUT);
 212
 213 }
 214
 215 static inline int qt2_setregister(struct usb_device *dev,
 216                                   u8 uart, u8 reg, u16 data)
 217 {
 218         u16 value = (data << 8) | reg;
 219
 220         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 221                                QT_SET_GET_REGISTER, 0x40, value, uart,
 222                                NULL, 0, QT2_USB_TIMEOUT);
 223 }
 224
 225 static inline int update_mctrl(struct qt2_port_private *port_priv,
 226                                unsigned int set, unsigned int clear)
 227 {
 228         struct usb_serial_port *port = port_priv->port;
 229         struct usb_device *dev = port->serial->dev;
 230         unsigned urb_value;
 231         int status;
 232
 233         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 234                 dev_dbg(&port->dev,
 235                         "update_mctrl - DTR|RTS not being set|cleared\n");
 236                 return 0;       /* no change */
 237         }
 238
 239         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 240         urb_value = 0;
 241         if (set & TIOCM_DTR)
 242                 urb_value |= UART_MCR_DTR;
 243         if (set & TIOCM_RTS)
 244                 urb_value |= UART_MCR_RTS;
 245
 246         status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
 247                                  urb_value);
 248         if (status < 0)
 249                 dev_err(&port->dev,
 250                         "update_mctrl - Error from MODEM_CTRL urb: %i\n",
 251                         status);
 252         return status;
 253 }
 254
 255 static int qt2_calc_num_ports(struct usb_serial *serial)
 256 {
 257         struct qt2_device_detail d;
 258         int i;
 259
 260         for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
 261                 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
 262                         return d.num_ports;
 263         }
 264
 265         /* we didn't recognize the device */
 266         dev_err(&serial->dev->dev,
 267                  "don't know the number of ports, assuming 1\n");
 268
 269         return 1;
 270 }
 271
 272 static void qt2_set_termios(struct tty_struct *tty,
 273                             struct usb_serial_port *port,
 274                             struct ktermios *old_termios)
 275 {
 276         struct usb_device *dev = port->serial->dev;
 277         struct qt2_port_private *port_priv;
 278         struct ktermios *termios = &tty->termios;
 279         u16 baud;
 280         unsigned int cflag = termios->c_cflag;
 281         u16 new_lcr = 0;
 282         int status;
 283
 284         port_priv = usb_get_serial_port_data(port);
 285
 286         if (cflag & PARENB) {
 287                 if (cflag & PARODD)
 288                         new_lcr |= UART_LCR_PARITY;
 289                 else
 290                         new_lcr |= SERIAL_EVEN_PARITY;
 291         }
 292
 293         switch (cflag & CSIZE) {
 294         case CS5:
 295                 new_lcr |= UART_LCR_WLEN5;
 296                 break;
 297         case CS6:
 298                 new_lcr |= UART_LCR_WLEN6;
 299                 break;
 300         case CS7:
 301                 new_lcr |= UART_LCR_WLEN7;
 302                 break;
 303         default:
 304         case CS8:
 305                 new_lcr |= UART_LCR_WLEN8;
 306                 break;
 307         }
 308
 309         baud = tty_get_baud_rate(tty);
 310         if (!baud)
 311                 baud = 9600;
 312
 313         status = qt2_set_port_config(dev, port_priv->device_port, baud,
 314                                      new_lcr);
 315         if (status < 0)
 316                 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
 317                         __func__, status);
 318
 319         if (cflag & CRTSCTS)
 320                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 321                                          SERIAL_CRTSCTS,
 322                                          port_priv->device_port);
 323         else
 324                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 325                                          0, port_priv->device_port);
 326         if (status < 0)
 327                 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
 328                         __func__, status);
 329
 330         if (I_IXOFF(tty) || I_IXON(tty)) {
 331                 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
 332
 333                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 334                                          x, port_priv->device_port);
 335         } else
 336                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 337                                          0, port_priv->device_port);
 338
 339         if (status < 0)
 340                 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
 341                         __func__, status);
 342
 343 }
 344
 345 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
 346 {
 347         struct usb_serial *serial;
 348         struct qt2_port_private *port_priv;
 349         u8 *data;
 350         u16 device_port;
 351         int status;
 352         unsigned long flags;
 353
 354         device_port = (u16) (port->number - port->serial->minor);
 355
 356         serial = port->serial;
 357
 358         port_priv = usb_get_serial_port_data(port);
 359
 360         /* set the port to RS232 mode */
 361         status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
 362                                  QT2_QMCR_RS232, device_port);
 363         if (status < 0) {
 364                 dev_err(&port->dev,
 365                         "%s failed to set RS232 mode for port %i error %i\n",
 366                         __func__, device_port, status);
 367                 return status;
 368         }
 369
 370         data = kzalloc(2, GFP_KERNEL);
 371         if (!data)
 372                 return -ENOMEM;
 373
 374         /* open the port */
 375         status = usb_control_msg(serial->dev,
 376                                  usb_rcvctrlpipe(serial->dev, 0),
 377                                  QT_OPEN_CLOSE_CHANNEL,
 378                                  0xc0, 0,
 379                                  device_port, data, 2, QT2_USB_TIMEOUT);
 380
 381         if (status < 0) {
 382                 dev_err(&port->dev, "%s - open port failed %i", __func__,
 383                         status);
 384                 kfree(data);
 385                 return status;
 386         }
 387
 388         spin_lock_irqsave(&port_priv->lock, flags);
 389         port_priv->shadowLSR = data[0];
 390         port_priv->shadowMSR = data[1];
 391         spin_unlock_irqrestore(&port_priv->lock, flags);
 392
 393         kfree(data);
 394
 395         /* set to default speed and 8bit word size */
 396         status = qt2_set_port_config(serial->dev, device_port,
 397                                      DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
 398         if (status < 0) {
 399                 dev_err(&port->dev,
 400                         "%s - initial setup failed for port %i (%i)\n",
 401                         __func__, port->number, device_port);
 402                 return status;
 403         }
 404
 405         port_priv->is_open = true;
 406         port_priv->device_port = (u8) device_port;
 407
 408         if (tty)
 409                 qt2_set_termios(tty, port, &tty->termios);
 410
 411         return 0;
 412
 413 }
 414
 415 static void qt2_close(struct usb_serial_port *port)
 416 {
 417         struct usb_serial *serial;
 418         struct qt2_port_private *port_priv;
 419         unsigned long flags;
 420         int i;
 421
 422         serial = port->serial;
 423         port_priv = usb_get_serial_port_data(port);
 424
 425         port_priv->is_open = false;
 426
 427         spin_lock_irqsave(&port_priv->urb_lock, flags);
 428         if (port_priv->write_urb->status == -EINPROGRESS)
 429                 usb_kill_urb(port_priv->write_urb);
 430         port_priv->urb_in_use = false;
 431         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 432
 433         /* flush the port transmit buffer */
 434         i = usb_control_msg(serial->dev,
 435                             usb_rcvctrlpipe(serial->dev, 0),
 436                             QT2_FLUSH_DEVICE, 0x40, 1,
 437                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 438
 439         if (i < 0)
 440                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
 441                         __func__, i);
 442
 443         /* flush the port receive buffer */
 444         i = usb_control_msg(serial->dev,
 445                             usb_rcvctrlpipe(serial->dev, 0),
 446                             QT2_FLUSH_DEVICE, 0x40, 0,
 447                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 448
 449         if (i < 0)
 450                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
 451                         __func__, i);
 452
 453         /* close the port */
 454         i = usb_control_msg(serial->dev,
 455                             usb_sndctrlpipe(serial->dev, 0),
 456                             QT_OPEN_CLOSE_CHANNEL,
 457                             0x40, 0,
 458                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 459
 460         if (i < 0)
 461                 dev_err(&port->dev, "%s - close port failed %i\n",
 462                         __func__, i);
 463
 464 }
 465
 466 static void qt2_disconnect(struct usb_serial *serial)
 467 {
 468         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
 469         struct qt2_port_private *port_priv;
 470         int i;
 471
 472         if (serial_priv->read_urb->status == -EINPROGRESS)
 473                 usb_kill_urb(serial_priv->read_urb);
 474
 475         usb_free_urb(serial_priv->read_urb);
 476
 477         for (i = 0; i < serial->num_ports; i++) {
 478                 port_priv = usb_get_serial_port_data(serial->port[i]);
 479
 480                 if (port_priv->write_urb->status == -EINPROGRESS)
 481                         usb_kill_urb(port_priv->write_urb);
 482                 usb_free_urb(port_priv->write_urb);
 483         }
 484 }
 485
 486 static int get_serial_info(struct usb_serial_port *port,
 487                            struct serial_struct __user *retinfo)
 488 {
 489         struct serial_struct tmp;
 490
 491         if (!retinfo)
 492                 return -EFAULT;
 493
 494         memset(&tmp, 0, sizeof(tmp));
 495         tmp.line                = port->serial->minor;
 496         tmp.port                = 0;
 497         tmp.irq                 = 0;
 498         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 499         tmp.xmit_fifo_size      = port->bulk_out_size;
 500         tmp.baud_base           = 9600;
 501         tmp.close_delay         = 5*HZ;
 502         tmp.closing_wait        = 30*HZ;
 503
 504         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 505                 return -EFAULT;
 506         return 0;
 507 }
 508
 509 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 510 {
 511         struct qt2_port_private *priv = usb_get_serial_port_data(port);
 512         struct async_icount prev, cur;
 513         unsigned long flags;
 514
 515         spin_lock_irqsave(&priv->lock, flags);
 516         prev = priv->icount;
 517         spin_unlock_irqrestore(&priv->lock, flags);
 518
 519         while (1) {
 520                 wait_event_interruptible(priv->delta_msr_wait,
 521                                          ((priv->icount.rng != prev.rng) ||
 522                                           (priv->icount.dsr != prev.dsr) ||
 523                                           (priv->icount.dcd != prev.dcd) ||
 524                                           (priv->icount.cts != prev.cts)));
 525
 526                 if (signal_pending(current))
 527                         return -ERESTARTSYS;
 528
 529                 spin_lock_irqsave(&priv->lock, flags);
 530                 cur = priv->icount;
 531                 spin_unlock_irqrestore(&priv->lock, flags);
 532
 533                 if ((prev.rng == cur.rng) &&
 534                     (prev.dsr == cur.dsr) &&
 535                     (prev.dcd == cur.dcd) &&
 536                     (prev.cts == cur.cts))
 537                         return -EIO;
 538
 539                 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
 540                     (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
 541                     (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
 542                     (arg & TIOCM_CTS && (prev.cts != cur.cts)))
 543                         return 0;
 544         }
 545         return 0;
 546 }
 547
 548 static int qt2_get_icount(struct tty_struct *tty,
 549                           struct serial_icounter_struct *icount)
 550 {
 551         struct usb_serial_port *port = tty->driver_data;
 552         struct qt2_port_private *priv = usb_get_serial_port_data(port);
 553         struct async_icount cnow = priv->icount;
 554
 555         icount->cts = cnow.cts;
 556         icount->dsr = cnow.dsr;
 557         icount->rng = cnow.rng;
 558         icount->dcd = cnow.dcd;
 559         icount->rx = cnow.rx;
 560         icount->tx = cnow.tx;
 561         icount->frame = cnow.frame;
 562         icount->overrun = cnow.overrun;
 563         icount->parity = cnow.parity;
 564         icount->brk = cnow.brk;
 565         icount->buf_overrun = cnow.buf_overrun;
 566
 567         return 0;
 568 }
 569
 570 static int qt2_ioctl(struct tty_struct *tty,
 571                      unsigned int cmd, unsigned long arg)
 572 {
 573         struct usb_serial_port *port = tty->driver_data;
 574
 575         switch (cmd) {
 576         case TIOCGSERIAL:
 577                 return get_serial_info(port,
 578                                        (struct serial_struct __user *)arg);
 579
 580         case TIOCMIWAIT:
 581                 return wait_modem_info(port, arg);
 582
 583         default:
 584                 break;
 585         }
 586
 587         return -ENOIOCTLCMD;
 588 }
 589
 590 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
 591 {
 592         switch (*ch) {
 593         case QT2_LINE_STATUS:
 594                 qt2_update_lsr(port, ch + 1);
 595                 break;
 596         case QT2_MODEM_STATUS:
 597                 qt2_update_msr(port, ch + 1);
 598                 break;
 599         }
 600 }
 601
 602 /* not needed, kept to document functionality */
 603 static void qt2_process_xmit_empty(struct usb_serial_port *port,
 604                                    unsigned char *ch)
 605 {
 606         int bytes_written;
 607
 608         bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
 609 }
 610
 611 /* not needed, kept to document functionality */
 612 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
 613 {
 614         return;
 615 }
 616
 617 void qt2_process_read_urb(struct urb *urb)
 618 {
 619         struct usb_serial *serial;
 620         struct qt2_serial_private *serial_priv;
 621         struct usb_serial_port *port;
 622         struct qt2_port_private *port_priv;
 623         struct tty_struct *tty;
 624         bool escapeflag;
 625         unsigned char *ch;
 626         int i;
 627         unsigned char newport;
 628         int len = urb->actual_length;
 629
 630         if (!len)
 631                 return;
 632
 633         ch = urb->transfer_buffer;
 634         tty = NULL;
 635         serial = urb->context;
 636         serial_priv = usb_get_serial_data(serial);
 637         port = serial->port[serial_priv->current_port];
 638         port_priv = usb_get_serial_port_data(port);
 639
 640         if (port_priv->is_open)
 641                 tty = tty_port_tty_get(&port->port);
 642
 643         for (i = 0; i < urb->actual_length; i++) {
 644                 ch = (unsigned char *)urb->transfer_buffer + i;
 645                 if ((i <= (len - 3)) &&
 646                     (*ch == QT2_CONTROL_BYTE) &&
 647                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
 648                         escapeflag = false;
 649                         switch (*(ch + 2)) {
 650                         case QT2_LINE_STATUS:
 651                         case QT2_MODEM_STATUS:
 652                                 if (i > (len - 4)) {
 653                                         dev_warn(&port->dev,
 654                                                  "%s - status message too short\n",
 655                                                 __func__);
 656                                         break;
 657                                 }
 658                                 qt2_process_status(port, ch + 2);
 659                                 i += 3;
 660                                 escapeflag = true;
 661                                 break;
 662                         case QT2_XMIT_HOLD:
 663                                 if (i > (len - 5)) {
 664                                         dev_warn(&port->dev,
 665                                                  "%s - xmit_empty message too short\n",
 666                                                  __func__);
 667                                         break;
 668                                 }
 669                                 qt2_process_xmit_empty(port, ch + 3);
 670                                 i += 4;
 671                                 escapeflag = true;
 672                                 break;
 673                         case QT2_CHANGE_PORT:
 674                                 if (i > (len - 4)) {
 675                                         dev_warn(&port->dev,
 676                                                  "%s - change_port message too short\n",
 677                                                  __func__);
 678                                         break;
 679                                 }
 680                                 if (tty) {
 681                                         tty_flip_buffer_push(tty);
 682                                         tty_kref_put(tty);
 683                                 }
 684
 685                                 newport = *(ch + 3);
 686
 687                                 if (newport > serial->num_ports) {
 688                                         dev_err(&port->dev,
 689                                                 "%s - port change to invalid port: %i\n",
 690                                                 __func__, newport);
 691                                         break;
 692                                 }
 693
 694                                 serial_priv->current_port = newport;
 695                                 port = serial->port[serial_priv->current_port];
 696                                 port_priv = usb_get_serial_port_data(port);
 697                                 if (port_priv->is_open)
 698                                         tty = tty_port_tty_get(&port->port);
 699                                 else
 700                                         tty = NULL;
 701                                 i += 3;
 702                                 escapeflag = true;
 703                                 break;
 704                         case QT2_REC_FLUSH:
 705                         case QT2_XMIT_FLUSH:
 706                                 qt2_process_flush(port, ch + 2);
 707                                 i += 2;
 708                                 escapeflag = true;
 709                                 break;
 710                         case QT2_CONTROL_ESCAPE:
 711                                 tty_buffer_request_room(tty, 2);
 712                                 tty_insert_flip_string(tty, ch, 2);
 713                                 i += 2;
 714                                 escapeflag = true;
 715                                 break;
 716                         default:
 717                                 dev_warn(&port->dev,
 718                                          "%s - unsupported command %i\n",
 719                                          __func__, *(ch + 2));
 720                                 break;
 721                         }
 722                         if (escapeflag)
 723                                 continue;
 724                 }
 725
 726                 if (tty) {
 727                         tty_buffer_request_room(tty, 1);
 728                         tty_insert_flip_string(tty, ch, 1);
 729                 }
 730         }
 731
 732         if (tty) {
 733                 tty_flip_buffer_push(tty);
 734                 tty_kref_put(tty);
 735         }
 736 }
 737
 738 static void qt2_write_bulk_callback(struct urb *urb)
 739 {
 740         struct usb_serial_port *port;
 741         struct qt2_port_private *port_priv;
 742
 743         port = urb->context;
 744         port_priv = usb_get_serial_port_data(port);
 745
 746         spin_lock(&port_priv->urb_lock);
 747
 748         port_priv->urb_in_use = false;
 749         usb_serial_port_softint(port);
 750
 751         spin_unlock(&port_priv->urb_lock);
 752
 753 }
 754
 755 static void qt2_read_bulk_callback(struct urb *urb)
 756 {
 757         struct usb_serial *serial = urb->context;
 758         int status;
 759
 760         if (urb->status) {
 761                 dev_warn(&serial->dev->dev,
 762                          "%s - non-zero urb status: %i\n", __func__,
 763                          urb->status);
 764                 return;
 765         }
 766
 767         qt2_process_read_urb(urb);
 768
 769         status = usb_submit_urb(urb, GFP_ATOMIC);
 770         if (status != 0)
 771                 dev_err(&serial->dev->dev,
 772                         "%s - resubmit read urb failed: %i\n",
 773                         __func__, status);
 774 }
 775
 776 static int qt2_setup_urbs(struct usb_serial *serial)
 777 {
 778         struct usb_serial_port *port;
 779         struct usb_serial_port *port0;
 780         struct qt2_serial_private *serial_priv;
 781         struct qt2_port_private *port_priv;
 782         int pcount, status;
 783
 784         port0 = serial->port[0];
 785
 786         serial_priv = usb_get_serial_data(serial);
 787         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 788         if (!serial_priv->read_urb) {
 789                 dev_err(&serial->dev->dev, "No free urbs available\n");
 790                 return -ENOMEM;
 791         }
 792
 793         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
 794                           usb_rcvbulkpipe(serial->dev,
 795                                           port0->bulk_in_endpointAddress),
 796                           serial_priv->read_buffer,
 797                           sizeof(serial_priv->read_buffer),
 798                           qt2_read_bulk_callback, serial);
 799
 800         /* setup write_urb for each port */
 801         for (pcount = 0; pcount < serial->num_ports; pcount++) {
 802
 803                 port = serial->port[pcount];
 804                 port_priv = usb_get_serial_port_data(port);
 805
 806                 port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 807                 if (!port_priv->write_urb) {
 808                         dev_err(&serial->dev->dev,
 809                                 "failed to alloc write_urb for port %i\n",
 810                                 pcount);
 811                         return -ENOMEM;
 812                 }
 813
 814                 usb_fill_bulk_urb(port_priv->write_urb,
 815                                   serial->dev,
 816                                   usb_sndbulkpipe(serial->dev,
 817                                                   port0->
 818                                                   bulk_out_endpointAddress),
 819                                   port_priv->write_buffer,
 820                                   sizeof(port_priv->write_buffer),
 821                                   qt2_write_bulk_callback, port);
 822         }
 823
 824         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
 825         if (status != 0) {
 826                 dev_err(&serial->dev->dev,
 827                         "%s - submit read urb failed %i\n", __func__, status);
 828                 return status;
 829         }
 830
 831         return 0;
 832
 833 }
 834
 835 static int qt2_attach(struct usb_serial *serial)
 836 {
 837         struct qt2_serial_private *serial_priv;
 838         struct qt2_port_private *port_priv;
 839         int status, pcount;
 840
 841         /* power on unit */
 842         status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 843                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
 844                                  QT2_USB_TIMEOUT);
 845         if (status < 0) {
 846                 dev_err(&serial->dev->dev,
 847                         "%s - failed to power on unit: %i\n", __func__, status);
 848                 return status;
 849         }
 850
 851         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 852         if (!serial_priv) {
 853                 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
 854                 return -ENOMEM;
 855         }
 856
 857         usb_set_serial_data(serial, serial_priv);
 858
 859         for (pcount = 0; pcount < serial->num_ports; pcount++) {
 860                 port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
 861                 if (!port_priv) {
 862                         dev_err(&serial->dev->dev,
 863                                 "%s- kmalloc(%Zd) failed.\n", __func__,
 864                                 sizeof(*port_priv));
 865                         pcount--;
 866                         status = -ENOMEM;
 867                         goto attach_failed;
 868                 }
 869
 870                 spin_lock_init(&port_priv->lock);
 871                 spin_lock_init(&port_priv->urb_lock);
 872                 init_waitqueue_head(&port_priv->delta_msr_wait);
 873
 874                 port_priv->port = serial->port[pcount];
 875
 876                 usb_set_serial_port_data(serial->port[pcount], port_priv);
 877         }
 878
 879         status = qt2_setup_urbs(serial);
 880         if (status != 0)
 881                 goto attach_failed;
 882
 883         return 0;
 884
 885 attach_failed:
 886         for (/* empty */; pcount >= 0; pcount--) {
 887                 port_priv = usb_get_serial_port_data(serial->port[pcount]);
 888                 kfree(port_priv);
 889         }
 890         kfree(serial_priv);
 891         return status;
 892 }
 893
 894 static int qt2_tiocmget(struct tty_struct *tty)
 895 {
 896         struct usb_serial_port *port = tty->driver_data;
 897         struct usb_device *dev = port->serial->dev;
 898         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 899         u8 *d;
 900         int r;
 901
 902         d = kzalloc(2, GFP_KERNEL);
 903         if (!d)
 904                 return -ENOMEM;
 905
 906         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
 907         if (r < 0)
 908                 goto mget_out;
 909
 910         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
 911         if (r < 0)
 912                 goto mget_out;
 913
 914         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 915             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 916             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 917             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 918             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 919             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 920
 921 mget_out:
 922         kfree(d);
 923         return r;
 924 }
 925
 926 static int qt2_tiocmset(struct tty_struct *tty,
 927                         unsigned int set, unsigned int clear)
 928 {
 929         struct qt2_port_private *port_priv;
 930
 931         port_priv = usb_get_serial_port_data(tty->driver_data);
 932         return update_mctrl(port_priv, set, clear);
 933 }
 934
 935 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
 936 {
 937         struct usb_serial_port *port = tty->driver_data;
 938         struct qt2_port_private *port_priv;
 939         int status;
 940         u16 val;
 941
 942         port_priv = usb_get_serial_port_data(port);
 943
 944         if (!port_priv->is_open) {
 945                 dev_err(&port->dev,
 946                         "%s - port is not open\n", __func__);
 947                 return;
 948         }
 949
 950         val = (break_state == -1) ? 1 : 0;
 951
 952         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
 953                                  val, port_priv->device_port);
 954         if (status < 0)
 955                 dev_warn(&port->dev,
 956                          "%s - failed to send control message: %i\n", __func__,
 957                          status);
 958 }
 959
 960
 961
 962 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
 963 {
 964         struct usb_device *dev = port->serial->dev;
 965         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 966
 967         mutex_lock(&port->serial->disc_mutex);
 968         if (!port->serial->disconnected) {
 969                 /* Disable flow control */
 970                 if (!on && qt2_setregister(dev, port_priv->device_port,
 971                                            UART_MCR, 0) < 0)
 972                         dev_warn(&port->dev, "error from flowcontrol urb\n");
 973                 /* drop RTS and DTR */
 974                 if (on)
 975                         update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
 976                 else
 977                         update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 978         }
 979         mutex_unlock(&port->serial->disc_mutex);
 980 }
 981
 982 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
 983 {
 984         struct qt2_port_private *port_priv;
 985         u8 newMSR = (u8) *ch;
 986         unsigned long flags;
 987
 988         port_priv = usb_get_serial_port_data(port);
 989
 990         spin_lock_irqsave(&port_priv->lock, flags);
 991         port_priv->shadowMSR = newMSR;
 992         spin_unlock_irqrestore(&port_priv->lock, flags);
 993
 994         if (newMSR & UART_MSR_ANY_DELTA) {
 995                 /* update input line counters */
 996                 if (newMSR & UART_MSR_DCTS)
 997                         port_priv->icount.cts++;
 998
 999                 if (newMSR & UART_MSR_DDSR)
1000                         port_priv->icount.dsr++;
1001
1002                 if (newMSR & UART_MSR_DDCD)
1003                         port_priv->icount.dcd++;
1004
1005                 if (newMSR & UART_MSR_TERI)
1006                         port_priv->icount.rng++;
1007
1008                 wake_up_interruptible(&port_priv->delta_msr_wait);
1009         }
1010 }
1011
1012 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
1013 {
1014         struct qt2_port_private *port_priv;
1015         struct async_icount *icount;
1016         unsigned long flags;
1017         u8 newLSR = (u8) *ch;
1018
1019         port_priv = usb_get_serial_port_data(port);
1020
1021         if (newLSR & UART_LSR_BI)
1022                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
1023
1024         spin_lock_irqsave(&port_priv->lock, flags);
1025         port_priv->shadowLSR = newLSR;
1026         spin_unlock_irqrestore(&port_priv->lock, flags);
1027
1028         icount = &port_priv->icount;
1029
1030         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
1031
1032                 if (newLSR & UART_LSR_BI)
1033                         icount->brk++;
1034
1035                 if (newLSR & UART_LSR_OE)
1036                         icount->overrun++;
1037
1038                 if (newLSR & UART_LSR_PE)
1039                         icount->parity++;
1040
1041                 if (newLSR & UART_LSR_FE)
1042                         icount->frame++;
1043         }
1044
1045 }
1046
1047 static int qt2_write_room(struct tty_struct *tty)
1048 {
1049         struct usb_serial_port *port = tty->driver_data;
1050         struct qt2_port_private *port_priv;
1051         unsigned long flags = 0;
1052         int r;
1053
1054         port_priv = usb_get_serial_port_data(port);
1055
1056         spin_lock_irqsave(&port_priv->urb_lock, flags);
1057
1058         if (port_priv->urb_in_use)
1059                 r = 0;
1060         else
1061                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
1062
1063         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1064
1065         return r;
1066 }
1067
1068 static int qt2_write(struct tty_struct *tty,
1069                      struct usb_serial_port *port,
1070                      const unsigned char *buf, int count)
1071 {
1072         struct qt2_port_private *port_priv;
1073         struct urb *write_urb;
1074         unsigned char *data;
1075         unsigned long flags;
1076         int status;
1077         int bytes_out = 0;
1078
1079         port_priv = usb_get_serial_port_data(port);
1080
1081         if (port_priv->write_urb == NULL) {
1082                 dev_err(&port->dev, "%s - no output urb\n", __func__);
1083                 return 0;
1084         }
1085         write_urb = port_priv->write_urb;
1086
1087         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
1088
1089         data = write_urb->transfer_buffer;
1090         spin_lock_irqsave(&port_priv->urb_lock, flags);
1091         if (port_priv->urb_in_use == true) {
1092                 printk(KERN_INFO "qt2_write - urb is in use\n");
1093                 goto write_out;
1094         }
1095
1096         *data++ = QT2_CONTROL_BYTE;
1097         *data++ = QT2_CONTROL_BYTE;
1098         *data++ = port_priv->device_port;
1099         put_unaligned_le16(count, data);
1100         data += 2;
1101         memcpy(data, buf, count);
1102
1103         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
1104
1105         status = usb_submit_urb(write_urb, GFP_ATOMIC);
1106         if (status == 0) {
1107                 port_priv->urb_in_use = true;
1108                 bytes_out += count;
1109         }
1110
1111 write_out:
1112         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1113         return bytes_out;
1114 }
1115
1116
1117 static struct usb_serial_driver qt2_device = {
1118         .driver = {
1119                 .owner = THIS_MODULE,
1120                 .name = "quatech-serial",
1121         },
1122         .description         = DRIVER_DESC,
1123         .id_table            = id_table,
1124         .open                = qt2_open,
1125         .close               = qt2_close,
1126         .write               = qt2_write,
1127         .write_room          = qt2_write_room,
1128         .calc_num_ports      = qt2_calc_num_ports,
1129         .attach              = qt2_attach,
1130         .release             = qt2_release,
1131         .disconnect          = qt2_disconnect,
1132         .dtr_rts             = qt2_dtr_rts,
1133         .break_ctl           = qt2_break_ctl,
1134         .tiocmget            = qt2_tiocmget,
1135         .tiocmset            = qt2_tiocmset,
1136         .get_icount          = qt2_get_icount,
1137         .ioctl               = qt2_ioctl,
1138         .set_termios         = qt2_set_termios,
1139 };
1140
1141 static struct usb_serial_driver *const serial_drivers[] = {
1142         &qt2_device, NULL
1143 };
1144
1145 module_usb_serial_driver(serial_drivers, id_table);
1146
1147 MODULE_DESCRIPTION(DRIVER_DESC);
1148 MODULE_LICENSE("GPL");
1149
1150 module_param(debug, bool, S_IRUGO | S_IWUSR);
1151 MODULE_PARM_DESC(debug, "Debug enabled or not");