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 /* default urb timeout for usb operations */
  31 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
  32
  33 #define QT_OPEN_CLOSE_CHANNEL       0xca
  34 #define QT_SET_GET_DEVICE           0xc2
  35 #define QT_SET_GET_REGISTER         0xc0
  36 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  37 #define QT_SET_ATF                  0xcd
  38 #define QT_TRANSFER_IN              0xc0
  39 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  40 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  41 #define QT2_BREAK_CONTROL           0xc8
  42 #define QT2_GET_SET_UART            0xc1
  43 #define QT2_FLUSH_DEVICE            0xc4
  44 #define QT2_GET_SET_QMCR            0xe1
  45 #define QT2_QMCR_RS232              0x40
  46 #define QT2_QMCR_RS422              0x10
  47
  48 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
  49
  50 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
  51
  52 /* status bytes for the device */
  53 #define QT2_CONTROL_BYTE    0x1b
  54 #define QT2_LINE_STATUS     0x00  /* following 1 byte is line status */
  55 #define QT2_MODEM_STATUS    0x01  /* following 1 byte is modem status */
  56 #define QT2_XMIT_HOLD       0x02  /* following 2 bytes are ?? */
  57 #define QT2_CHANGE_PORT     0x03  /* following 1 byte is port to change to */
  58 #define QT2_REC_FLUSH       0x04  /* no following info */
  59 #define QT2_XMIT_FLUSH      0x05  /* no following info */
  60 #define QT2_CONTROL_ESCAPE  0xff  /* pass through previous 2 control bytes */
  61
  62 #define  MAX_BAUD_RATE              921600
  63 #define  DEFAULT_BAUD_RATE          9600
  64
  65 #define QT2_WRITE_BUFFER_SIZE   512  /* size of write buffer */
  66 #define QT2_WRITE_CONTROL_SIZE  5    /* control bytes used for a write */
  67
  68 /* Version Information */
  69 #define DRIVER_VERSION "v0.1"
  70 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
  71
  72 #define USB_VENDOR_ID_QUATECH   0x061d
  73 #define QUATECH_SSU2_100        0xC120  /* RS232 single port */
  74 #define QUATECH_DSU2_100        0xC140  /* RS232 dual port */
  75 #define QUATECH_DSU2_400        0xC150  /* RS232/422/485 dual port */
  76 #define QUATECH_QSU2_100        0xC160  /* RS232 four port */
  77 #define QUATECH_QSU2_400        0xC170  /* RS232/422/485 four port */
  78 #define QUATECH_ESU2_100        0xC1A0  /* RS232 eight port */
  79 #define QUATECH_ESU2_400        0xC180  /* RS232/422/485 eight port */
  80
  81 struct qt2_device_detail {
  82         int product_id;
  83         int num_ports;
  84 };
  85
  86 #define QT_DETAILS(prod, ports) \
  87         .product_id = (prod),   \
  88         .num_ports = (ports)
  89
  90 static const struct qt2_device_detail qt2_device_details[] = {
  91         {QT_DETAILS(QUATECH_SSU2_100, 1)},
  92         {QT_DETAILS(QUATECH_DSU2_400, 2)},
  93         {QT_DETAILS(QUATECH_DSU2_100, 2)},
  94         {QT_DETAILS(QUATECH_QSU2_400, 4)},
  95         {QT_DETAILS(QUATECH_QSU2_100, 4)},
  96         {QT_DETAILS(QUATECH_ESU2_400, 8)},
  97         {QT_DETAILS(QUATECH_ESU2_100, 8)},
  98         {QT_DETAILS(0, 0)}      /* Terminating entry */
  99 };
 100
 101 static const struct usb_device_id id_table[] = {
 102         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
 103         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
 104         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
 105         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
 106         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
 107         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
 108         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
 109         {}                      /* Terminating entry */
 110 };
 111 MODULE_DEVICE_TABLE(usb, id_table);
 112
 113 struct qt2_serial_private {
 114         unsigned char current_port;  /* current port for incoming data */
 115
 116         struct urb      *read_urb;   /* shared among all ports */
 117         char            read_buffer[512];
 118 };
 119
 120 struct qt2_port_private {
 121         bool is_open;
 122         u8   device_port;
 123
 124         spinlock_t urb_lock;
 125         bool       urb_in_use;
 126         struct urb *write_urb;
 127         char       write_buffer[QT2_WRITE_BUFFER_SIZE];
 128
 129         spinlock_t  lock;
 130         u8          shadowLSR;
 131         u8          shadowMSR;
 132
 133         wait_queue_head_t   delta_msr_wait; /* Used for TIOCMIWAIT */
 134         struct async_icount icount;
 135
 136         struct usb_serial_port *port;
 137 };
 138
 139 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
 140 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
 141 static void qt2_write_bulk_callback(struct urb *urb);
 142 static void qt2_read_bulk_callback(struct urb *urb);
 143
 144 static void qt2_release(struct usb_serial *serial)
 145 {
 146         struct qt2_serial_private *serial_priv;
 147
 148         serial_priv = usb_get_serial_data(serial);
 149
 150         usb_free_urb(serial_priv->read_urb);
 151         kfree(serial_priv);
 152 }
 153
 154 static inline int calc_baud_divisor(int baudrate)
 155 {
 156         int divisor, rem;
 157
 158         divisor = MAX_BAUD_RATE / baudrate;
 159         rem = MAX_BAUD_RATE % baudrate;
 160         /* Round to nearest divisor */
 161         if (((rem * 2) >= baudrate) && (baudrate != 110))
 162                 divisor++;
 163
 164         return divisor;
 165 }
 166
 167 static inline int qt2_set_port_config(struct usb_device *dev,
 168                                       unsigned char port_number,
 169                                       u16 baudrate, u16 lcr)
 170 {
 171         int divisor = calc_baud_divisor(baudrate);
 172         u16 index = ((u16) (lcr << 8) | (u16) (port_number));
 173
 174         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 175                                QT2_GET_SET_UART, 0x40,
 176                                divisor, index, NULL, 0, QT2_USB_TIMEOUT);
 177 }
 178
 179 static inline int qt2_control_msg(struct usb_device *dev,
 180                                   u8 request, u16 data, u16 index)
 181 {
 182         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 183                                request, 0x40, data, index,
 184                                NULL, 0, QT2_USB_TIMEOUT);
 185 }
 186
 187 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
 188 {
 189         u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
 190
 191         return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
 192 }
 193
 194
 195 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
 196 {
 197         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 198                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
 199                                data, 3, QT2_USB_TIMEOUT);
 200 }
 201
 202 static inline int qt2_getregister(struct usb_device *dev,
 203                                   u8 uart,
 204                                   u8 reg,
 205                                   u8 *data)
 206 {
 207         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 208                                QT_SET_GET_REGISTER, 0xc0, reg,
 209                                uart, data, sizeof(*data), QT2_USB_TIMEOUT);
 210
 211 }
 212
 213 static inline int qt2_setregister(struct usb_device *dev,
 214                                   u8 uart, u8 reg, u16 data)
 215 {
 216         u16 value = (data << 8) | reg;
 217
 218         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 219                                QT_SET_GET_REGISTER, 0x40, value, uart,
 220                                NULL, 0, QT2_USB_TIMEOUT);
 221 }
 222
 223 static inline int update_mctrl(struct qt2_port_private *port_priv,
 224                                unsigned int set, unsigned int clear)
 225 {
 226         struct usb_serial_port *port = port_priv->port;
 227         struct usb_device *dev = port->serial->dev;
 228         unsigned urb_value;
 229         int status;
 230
 231         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 232                 dev_dbg(&port->dev,
 233                         "update_mctrl - DTR|RTS not being set|cleared\n");
 234                 return 0;       /* no change */
 235         }
 236
 237         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 238         urb_value = 0;
 239         if (set & TIOCM_DTR)
 240                 urb_value |= UART_MCR_DTR;
 241         if (set & TIOCM_RTS)
 242                 urb_value |= UART_MCR_RTS;
 243
 244         status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
 245                                  urb_value);
 246         if (status < 0)
 247                 dev_err(&port->dev,
 248                         "update_mctrl - Error from MODEM_CTRL urb: %i\n",
 249                         status);
 250         return status;
 251 }
 252
 253 static int qt2_calc_num_ports(struct usb_serial *serial)
 254 {
 255         struct qt2_device_detail d;
 256         int i;
 257
 258         for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
 259                 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
 260                         return d.num_ports;
 261         }
 262
 263         /* we didn't recognize the device */
 264         dev_err(&serial->dev->dev,
 265                  "don't know the number of ports, assuming 1\n");
 266
 267         return 1;
 268 }
 269
 270 static void qt2_set_termios(struct tty_struct *tty,
 271                             struct usb_serial_port *port,
 272                             struct ktermios *old_termios)
 273 {
 274         struct usb_device *dev = port->serial->dev;
 275         struct qt2_port_private *port_priv;
 276         struct ktermios *termios = &tty->termios;
 277         u16 baud;
 278         unsigned int cflag = termios->c_cflag;
 279         u16 new_lcr = 0;
 280         int status;
 281
 282         port_priv = usb_get_serial_port_data(port);
 283
 284         if (cflag & PARENB) {
 285                 if (cflag & PARODD)
 286                         new_lcr |= UART_LCR_PARITY;
 287                 else
 288                         new_lcr |= SERIAL_EVEN_PARITY;
 289         }
 290
 291         switch (cflag & CSIZE) {
 292         case CS5:
 293                 new_lcr |= UART_LCR_WLEN5;
 294                 break;
 295         case CS6:
 296                 new_lcr |= UART_LCR_WLEN6;
 297                 break;
 298         case CS7:
 299                 new_lcr |= UART_LCR_WLEN7;
 300                 break;
 301         default:
 302         case CS8:
 303                 new_lcr |= UART_LCR_WLEN8;
 304                 break;
 305         }
 306
 307         baud = tty_get_baud_rate(tty);
 308         if (!baud)
 309                 baud = 9600;
 310
 311         status = qt2_set_port_config(dev, port_priv->device_port, baud,
 312                                      new_lcr);
 313         if (status < 0)
 314                 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
 315                         __func__, status);
 316
 317         if (cflag & CRTSCTS)
 318                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 319                                          SERIAL_CRTSCTS,
 320                                          port_priv->device_port);
 321         else
 322                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 323                                          0, port_priv->device_port);
 324         if (status < 0)
 325                 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
 326                         __func__, status);
 327
 328         if (I_IXOFF(tty) || I_IXON(tty)) {
 329                 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
 330
 331                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 332                                          x, port_priv->device_port);
 333         } else
 334                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 335                                          0, port_priv->device_port);
 336
 337         if (status < 0)
 338                 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
 339                         __func__, status);
 340
 341 }
 342
 343 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
 344 {
 345         struct usb_serial *serial;
 346         struct qt2_port_private *port_priv;
 347         u8 *data;
 348         u16 device_port;
 349         int status;
 350         unsigned long flags;
 351
 352         device_port = (u16) (port->number - port->serial->minor);
 353
 354         serial = port->serial;
 355
 356         port_priv = usb_get_serial_port_data(port);
 357
 358         /* set the port to RS232 mode */
 359         status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
 360                                  QT2_QMCR_RS232, device_port);
 361         if (status < 0) {
 362                 dev_err(&port->dev,
 363                         "%s failed to set RS232 mode for port %i error %i\n",
 364                         __func__, device_port, status);
 365                 return status;
 366         }
 367
 368         data = kzalloc(2, GFP_KERNEL);
 369         if (!data)
 370                 return -ENOMEM;
 371
 372         /* open the port */
 373         status = usb_control_msg(serial->dev,
 374                                  usb_rcvctrlpipe(serial->dev, 0),
 375                                  QT_OPEN_CLOSE_CHANNEL,
 376                                  0xc0, 0,
 377                                  device_port, data, 2, QT2_USB_TIMEOUT);
 378
 379         if (status < 0) {
 380                 dev_err(&port->dev, "%s - open port failed %i", __func__,
 381                         status);
 382                 kfree(data);
 383                 return status;
 384         }
 385
 386         spin_lock_irqsave(&port_priv->lock, flags);
 387         port_priv->shadowLSR = data[0];
 388         port_priv->shadowMSR = data[1];
 389         spin_unlock_irqrestore(&port_priv->lock, flags);
 390
 391         kfree(data);
 392
 393         /* set to default speed and 8bit word size */
 394         status = qt2_set_port_config(serial->dev, device_port,
 395                                      DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
 396         if (status < 0) {
 397                 dev_err(&port->dev,
 398                         "%s - initial setup failed for port %i (%i)\n",
 399                         __func__, port->number, device_port);
 400                 return status;
 401         }
 402
 403         port_priv->is_open = true;
 404         port_priv->device_port = (u8) device_port;
 405
 406         if (tty)
 407                 qt2_set_termios(tty, port, &tty->termios);
 408
 409         return 0;
 410
 411 }
 412
 413 static void qt2_close(struct usb_serial_port *port)
 414 {
 415         struct usb_serial *serial;
 416         struct qt2_port_private *port_priv;
 417         unsigned long flags;
 418         int i;
 419
 420         serial = port->serial;
 421         port_priv = usb_get_serial_port_data(port);
 422
 423         port_priv->is_open = false;
 424
 425         spin_lock_irqsave(&port_priv->urb_lock, flags);
 426         usb_kill_urb(port_priv->write_urb);
 427         port_priv->urb_in_use = false;
 428         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 429
 430         mutex_lock(&port->serial->disc_mutex);
 431         if (port->serial->disconnected) {
 432                 mutex_unlock(&port->serial->disc_mutex);
 433                 return;
 434         }
 435
 436         /* flush the port transmit buffer */
 437         i = usb_control_msg(serial->dev,
 438                             usb_rcvctrlpipe(serial->dev, 0),
 439                             QT2_FLUSH_DEVICE, 0x40, 1,
 440                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 441
 442         if (i < 0)
 443                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
 444                         __func__, i);
 445
 446         /* flush the port receive buffer */
 447         i = usb_control_msg(serial->dev,
 448                             usb_rcvctrlpipe(serial->dev, 0),
 449                             QT2_FLUSH_DEVICE, 0x40, 0,
 450                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 451
 452         if (i < 0)
 453                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
 454                         __func__, i);
 455
 456         /* close the port */
 457         i = usb_control_msg(serial->dev,
 458                             usb_sndctrlpipe(serial->dev, 0),
 459                             QT_OPEN_CLOSE_CHANNEL,
 460                             0x40, 0,
 461                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 462
 463         if (i < 0)
 464                 dev_err(&port->dev, "%s - close port failed %i\n",
 465                         __func__, i);
 466
 467         mutex_unlock(&port->serial->disc_mutex);
 468 }
 469
 470 static void qt2_disconnect(struct usb_serial *serial)
 471 {
 472         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
 473
 474         usb_kill_urb(serial_priv->read_urb);
 475 }
 476
 477 static int get_serial_info(struct usb_serial_port *port,
 478                            struct serial_struct __user *retinfo)
 479 {
 480         struct serial_struct tmp;
 481
 482         if (!retinfo)
 483                 return -EFAULT;
 484
 485         memset(&tmp, 0, sizeof(tmp));
 486         tmp.line                = port->serial->minor;
 487         tmp.port                = 0;
 488         tmp.irq                 = 0;
 489         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 490         tmp.xmit_fifo_size      = port->bulk_out_size;
 491         tmp.baud_base           = 9600;
 492         tmp.close_delay         = 5*HZ;
 493         tmp.closing_wait        = 30*HZ;
 494
 495         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 496                 return -EFAULT;
 497         return 0;
 498 }
 499
 500 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 501 {
 502         struct qt2_port_private *priv = usb_get_serial_port_data(port);
 503         struct async_icount prev, cur;
 504         unsigned long flags;
 505
 506         spin_lock_irqsave(&priv->lock, flags);
 507         prev = priv->icount;
 508         spin_unlock_irqrestore(&priv->lock, flags);
 509
 510         while (1) {
 511                 wait_event_interruptible(priv->delta_msr_wait,
 512                                          ((priv->icount.rng != prev.rng) ||
 513                                           (priv->icount.dsr != prev.dsr) ||
 514                                           (priv->icount.dcd != prev.dcd) ||
 515                                           (priv->icount.cts != prev.cts)));
 516
 517                 if (signal_pending(current))
 518                         return -ERESTARTSYS;
 519
 520                 spin_lock_irqsave(&priv->lock, flags);
 521                 cur = priv->icount;
 522                 spin_unlock_irqrestore(&priv->lock, flags);
 523
 524                 if ((prev.rng == cur.rng) &&
 525                     (prev.dsr == cur.dsr) &&
 526                     (prev.dcd == cur.dcd) &&
 527                     (prev.cts == cur.cts))
 528                         return -EIO;
 529
 530                 if ((arg & TIOCM_RNG && (prev.rng != cur.rng)) ||
 531                     (arg & TIOCM_DSR && (prev.dsr != cur.dsr)) ||
 532                     (arg & TIOCM_CD && (prev.dcd != cur.dcd)) ||
 533                     (arg & TIOCM_CTS && (prev.cts != cur.cts)))
 534                         return 0;
 535         }
 536         return 0;
 537 }
 538
 539 static int qt2_get_icount(struct tty_struct *tty,
 540                           struct serial_icounter_struct *icount)
 541 {
 542         struct usb_serial_port *port = tty->driver_data;
 543         struct qt2_port_private *priv = usb_get_serial_port_data(port);
 544         struct async_icount cnow = priv->icount;
 545
 546         icount->cts = cnow.cts;
 547         icount->dsr = cnow.dsr;
 548         icount->rng = cnow.rng;
 549         icount->dcd = cnow.dcd;
 550         icount->rx = cnow.rx;
 551         icount->tx = cnow.tx;
 552         icount->frame = cnow.frame;
 553         icount->overrun = cnow.overrun;
 554         icount->parity = cnow.parity;
 555         icount->brk = cnow.brk;
 556         icount->buf_overrun = cnow.buf_overrun;
 557
 558         return 0;
 559 }
 560
 561 static int qt2_ioctl(struct tty_struct *tty,
 562                      unsigned int cmd, unsigned long arg)
 563 {
 564         struct usb_serial_port *port = tty->driver_data;
 565
 566         switch (cmd) {
 567         case TIOCGSERIAL:
 568                 return get_serial_info(port,
 569                                        (struct serial_struct __user *)arg);
 570
 571         case TIOCMIWAIT:
 572                 return wait_modem_info(port, arg);
 573
 574         default:
 575                 break;
 576         }
 577
 578         return -ENOIOCTLCMD;
 579 }
 580
 581 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
 582 {
 583         switch (*ch) {
 584         case QT2_LINE_STATUS:
 585                 qt2_update_lsr(port, ch + 1);
 586                 break;
 587         case QT2_MODEM_STATUS:
 588                 qt2_update_msr(port, ch + 1);
 589                 break;
 590         }
 591 }
 592
 593 /* not needed, kept to document functionality */
 594 static void qt2_process_xmit_empty(struct usb_serial_port *port,
 595                                    unsigned char *ch)
 596 {
 597         int bytes_written;
 598
 599         bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
 600 }
 601
 602 /* not needed, kept to document functionality */
 603 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
 604 {
 605         return;
 606 }
 607
 608 void qt2_process_read_urb(struct urb *urb)
 609 {
 610         struct usb_serial *serial;
 611         struct qt2_serial_private *serial_priv;
 612         struct usb_serial_port *port;
 613         struct qt2_port_private *port_priv;
 614         struct tty_struct *tty;
 615         bool escapeflag;
 616         unsigned char *ch;
 617         int i;
 618         unsigned char newport;
 619         int len = urb->actual_length;
 620
 621         if (!len)
 622                 return;
 623
 624         ch = urb->transfer_buffer;
 625         tty = NULL;
 626         serial = urb->context;
 627         serial_priv = usb_get_serial_data(serial);
 628         port = serial->port[serial_priv->current_port];
 629         port_priv = usb_get_serial_port_data(port);
 630
 631         if (port_priv->is_open)
 632                 tty = tty_port_tty_get(&port->port);
 633
 634         for (i = 0; i < urb->actual_length; i++) {
 635                 ch = (unsigned char *)urb->transfer_buffer + i;
 636                 if ((i <= (len - 3)) &&
 637                     (*ch == QT2_CONTROL_BYTE) &&
 638                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
 639                         escapeflag = false;
 640                         switch (*(ch + 2)) {
 641                         case QT2_LINE_STATUS:
 642                         case QT2_MODEM_STATUS:
 643                                 if (i > (len - 4)) {
 644                                         dev_warn(&port->dev,
 645                                                  "%s - status message too short\n",
 646                                                 __func__);
 647                                         break;
 648                                 }
 649                                 qt2_process_status(port, ch + 2);
 650                                 i += 3;
 651                                 escapeflag = true;
 652                                 break;
 653                         case QT2_XMIT_HOLD:
 654                                 if (i > (len - 5)) {
 655                                         dev_warn(&port->dev,
 656                                                  "%s - xmit_empty message too short\n",
 657                                                  __func__);
 658                                         break;
 659                                 }
 660                                 qt2_process_xmit_empty(port, ch + 3);
 661                                 i += 4;
 662                                 escapeflag = true;
 663                                 break;
 664                         case QT2_CHANGE_PORT:
 665                                 if (i > (len - 4)) {
 666                                         dev_warn(&port->dev,
 667                                                  "%s - change_port message too short\n",
 668                                                  __func__);
 669                                         break;
 670                                 }
 671                                 if (tty) {
 672                                         tty_flip_buffer_push(tty);
 673                                         tty_kref_put(tty);
 674                                 }
 675
 676                                 newport = *(ch + 3);
 677
 678                                 if (newport > serial->num_ports) {
 679                                         dev_err(&port->dev,
 680                                                 "%s - port change to invalid port: %i\n",
 681                                                 __func__, newport);
 682                                         break;
 683                                 }
 684
 685                                 serial_priv->current_port = newport;
 686                                 port = serial->port[serial_priv->current_port];
 687                                 port_priv = usb_get_serial_port_data(port);
 688                                 if (port_priv->is_open)
 689                                         tty = tty_port_tty_get(&port->port);
 690                                 else
 691                                         tty = NULL;
 692                                 i += 3;
 693                                 escapeflag = true;
 694                                 break;
 695                         case QT2_REC_FLUSH:
 696                         case QT2_XMIT_FLUSH:
 697                                 qt2_process_flush(port, ch + 2);
 698                                 i += 2;
 699                                 escapeflag = true;
 700                                 break;
 701                         case QT2_CONTROL_ESCAPE:
 702                                 tty_buffer_request_room(tty, 2);
 703                                 tty_insert_flip_string(tty, ch, 2);
 704                                 i += 2;
 705                                 escapeflag = true;
 706                                 break;
 707                         default:
 708                                 dev_warn(&port->dev,
 709                                          "%s - unsupported command %i\n",
 710                                          __func__, *(ch + 2));
 711                                 break;
 712                         }
 713                         if (escapeflag)
 714                                 continue;
 715                 }
 716
 717                 if (tty) {
 718                         tty_buffer_request_room(tty, 1);
 719                         tty_insert_flip_string(tty, ch, 1);
 720                 }
 721         }
 722
 723         if (tty) {
 724                 tty_flip_buffer_push(tty);
 725                 tty_kref_put(tty);
 726         }
 727 }
 728
 729 static void qt2_write_bulk_callback(struct urb *urb)
 730 {
 731         struct usb_serial_port *port;
 732         struct qt2_port_private *port_priv;
 733
 734         port = urb->context;
 735         port_priv = usb_get_serial_port_data(port);
 736
 737         spin_lock(&port_priv->urb_lock);
 738
 739         port_priv->urb_in_use = false;
 740         usb_serial_port_softint(port);
 741
 742         spin_unlock(&port_priv->urb_lock);
 743
 744 }
 745
 746 static void qt2_read_bulk_callback(struct urb *urb)
 747 {
 748         struct usb_serial *serial = urb->context;
 749         int status;
 750
 751         if (urb->status) {
 752                 dev_warn(&serial->dev->dev,
 753                          "%s - non-zero urb status: %i\n", __func__,
 754                          urb->status);
 755                 return;
 756         }
 757
 758         qt2_process_read_urb(urb);
 759
 760         status = usb_submit_urb(urb, GFP_ATOMIC);
 761         if (status != 0)
 762                 dev_err(&serial->dev->dev,
 763                         "%s - resubmit read urb failed: %i\n",
 764                         __func__, status);
 765 }
 766
 767 static int qt2_setup_urbs(struct usb_serial *serial)
 768 {
 769         struct usb_serial_port *port0;
 770         struct qt2_serial_private *serial_priv;
 771         int status;
 772
 773         port0 = serial->port[0];
 774
 775         serial_priv = usb_get_serial_data(serial);
 776         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 777         if (!serial_priv->read_urb) {
 778                 dev_err(&serial->dev->dev, "No free urbs available\n");
 779                 return -ENOMEM;
 780         }
 781
 782         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
 783                           usb_rcvbulkpipe(serial->dev,
 784                                           port0->bulk_in_endpointAddress),
 785                           serial_priv->read_buffer,
 786                           sizeof(serial_priv->read_buffer),
 787                           qt2_read_bulk_callback, serial);
 788
 789         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
 790         if (status != 0) {
 791                 dev_err(&serial->dev->dev,
 792                         "%s - submit read urb failed %i\n", __func__, status);
 793                 usb_free_urb(serial_priv->read_urb);
 794                 return status;
 795         }
 796
 797         return 0;
 798 }
 799
 800 static int qt2_attach(struct usb_serial *serial)
 801 {
 802         struct qt2_serial_private *serial_priv;
 803         int status;
 804
 805         /* power on unit */
 806         status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 807                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
 808                                  QT2_USB_TIMEOUT);
 809         if (status < 0) {
 810                 dev_err(&serial->dev->dev,
 811                         "%s - failed to power on unit: %i\n", __func__, status);
 812                 return status;
 813         }
 814
 815         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 816         if (!serial_priv) {
 817                 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
 818                 return -ENOMEM;
 819         }
 820
 821         usb_set_serial_data(serial, serial_priv);
 822
 823         status = qt2_setup_urbs(serial);
 824         if (status != 0)
 825                 goto attach_failed;
 826
 827         return 0;
 828
 829 attach_failed:
 830         kfree(serial_priv);
 831         return status;
 832 }
 833
 834 static int qt2_port_probe(struct usb_serial_port *port)
 835 {
 836         struct usb_serial *serial = port->serial;
 837         struct qt2_port_private *port_priv;
 838         u8 bEndpointAddress;
 839
 840         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
 841         if (!port_priv)
 842                 return -ENOMEM;
 843
 844         spin_lock_init(&port_priv->lock);
 845         spin_lock_init(&port_priv->urb_lock);
 846         init_waitqueue_head(&port_priv->delta_msr_wait);
 847         port_priv->port = port;
 848
 849         port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 850         if (!port_priv->write_urb) {
 851                 kfree(port_priv);
 852                 return -ENOMEM;
 853         }
 854         bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
 855         usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
 856                                 usb_sndbulkpipe(serial->dev, bEndpointAddress),
 857                                 port_priv->write_buffer,
 858                                 sizeof(port_priv->write_buffer),
 859                                 qt2_write_bulk_callback, port);
 860
 861         usb_set_serial_port_data(port, port_priv);
 862
 863         return 0;
 864 }
 865
 866 static int qt2_port_remove(struct usb_serial_port *port)
 867 {
 868         struct qt2_port_private *port_priv;
 869
 870         port_priv = usb_get_serial_port_data(port);
 871         usb_free_urb(port_priv->write_urb);
 872         kfree(port_priv);
 873
 874         return 0;
 875 }
 876
 877 static int qt2_tiocmget(struct tty_struct *tty)
 878 {
 879         struct usb_serial_port *port = tty->driver_data;
 880         struct usb_device *dev = port->serial->dev;
 881         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 882         u8 *d;
 883         int r;
 884
 885         d = kzalloc(2, GFP_KERNEL);
 886         if (!d)
 887                 return -ENOMEM;
 888
 889         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
 890         if (r < 0)
 891                 goto mget_out;
 892
 893         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
 894         if (r < 0)
 895                 goto mget_out;
 896
 897         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 898             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 899             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 900             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 901             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 902             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 903
 904 mget_out:
 905         kfree(d);
 906         return r;
 907 }
 908
 909 static int qt2_tiocmset(struct tty_struct *tty,
 910                         unsigned int set, unsigned int clear)
 911 {
 912         struct qt2_port_private *port_priv;
 913
 914         port_priv = usb_get_serial_port_data(tty->driver_data);
 915         return update_mctrl(port_priv, set, clear);
 916 }
 917
 918 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
 919 {
 920         struct usb_serial_port *port = tty->driver_data;
 921         struct qt2_port_private *port_priv;
 922         int status;
 923         u16 val;
 924
 925         port_priv = usb_get_serial_port_data(port);
 926
 927         if (!port_priv->is_open) {
 928                 dev_err(&port->dev,
 929                         "%s - port is not open\n", __func__);
 930                 return;
 931         }
 932
 933         val = (break_state == -1) ? 1 : 0;
 934
 935         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
 936                                  val, port_priv->device_port);
 937         if (status < 0)
 938                 dev_warn(&port->dev,
 939                          "%s - failed to send control message: %i\n", __func__,
 940                          status);
 941 }
 942
 943
 944
 945 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
 946 {
 947         struct usb_device *dev = port->serial->dev;
 948         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 949
 950         mutex_lock(&port->serial->disc_mutex);
 951         if (!port->serial->disconnected) {
 952                 /* Disable flow control */
 953                 if (!on && qt2_setregister(dev, port_priv->device_port,
 954                                            UART_MCR, 0) < 0)
 955                         dev_warn(&port->dev, "error from flowcontrol urb\n");
 956                 /* drop RTS and DTR */
 957                 if (on)
 958                         update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
 959                 else
 960                         update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 961         }
 962         mutex_unlock(&port->serial->disc_mutex);
 963 }
 964
 965 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
 966 {
 967         struct qt2_port_private *port_priv;
 968         u8 newMSR = (u8) *ch;
 969         unsigned long flags;
 970
 971         port_priv = usb_get_serial_port_data(port);
 972
 973         spin_lock_irqsave(&port_priv->lock, flags);
 974         port_priv->shadowMSR = newMSR;
 975         spin_unlock_irqrestore(&port_priv->lock, flags);
 976
 977         if (newMSR & UART_MSR_ANY_DELTA) {
 978                 /* update input line counters */
 979                 if (newMSR & UART_MSR_DCTS)
 980                         port_priv->icount.cts++;
 981
 982                 if (newMSR & UART_MSR_DDSR)
 983                         port_priv->icount.dsr++;
 984
 985                 if (newMSR & UART_MSR_DDCD)
 986                         port_priv->icount.dcd++;
 987
 988                 if (newMSR & UART_MSR_TERI)
 989                         port_priv->icount.rng++;
 990
 991                 wake_up_interruptible(&port_priv->delta_msr_wait);
 992         }
 993 }
 994
 995 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
 996 {
 997         struct qt2_port_private *port_priv;
 998         struct async_icount *icount;
 999         unsigned long flags;
1000         u8 newLSR = (u8) *ch;
1001
1002         port_priv = usb_get_serial_port_data(port);
1003
1004         if (newLSR & UART_LSR_BI)
1005                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
1006
1007         spin_lock_irqsave(&port_priv->lock, flags);
1008         port_priv->shadowLSR = newLSR;
1009         spin_unlock_irqrestore(&port_priv->lock, flags);
1010
1011         icount = &port_priv->icount;
1012
1013         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
1014
1015                 if (newLSR & UART_LSR_BI)
1016                         icount->brk++;
1017
1018                 if (newLSR & UART_LSR_OE)
1019                         icount->overrun++;
1020
1021                 if (newLSR & UART_LSR_PE)
1022                         icount->parity++;
1023
1024                 if (newLSR & UART_LSR_FE)
1025                         icount->frame++;
1026         }
1027
1028 }
1029
1030 static int qt2_write_room(struct tty_struct *tty)
1031 {
1032         struct usb_serial_port *port = tty->driver_data;
1033         struct qt2_port_private *port_priv;
1034         unsigned long flags = 0;
1035         int r;
1036
1037         port_priv = usb_get_serial_port_data(port);
1038
1039         spin_lock_irqsave(&port_priv->urb_lock, flags);
1040
1041         if (port_priv->urb_in_use)
1042                 r = 0;
1043         else
1044                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
1045
1046         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1047
1048         return r;
1049 }
1050
1051 static int qt2_write(struct tty_struct *tty,
1052                      struct usb_serial_port *port,
1053                      const unsigned char *buf, int count)
1054 {
1055         struct qt2_port_private *port_priv;
1056         struct urb *write_urb;
1057         unsigned char *data;
1058         unsigned long flags;
1059         int status;
1060         int bytes_out = 0;
1061
1062         port_priv = usb_get_serial_port_data(port);
1063
1064         if (port_priv->write_urb == NULL) {
1065                 dev_err(&port->dev, "%s - no output urb\n", __func__);
1066                 return 0;
1067         }
1068         write_urb = port_priv->write_urb;
1069
1070         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
1071
1072         data = write_urb->transfer_buffer;
1073         spin_lock_irqsave(&port_priv->urb_lock, flags);
1074         if (port_priv->urb_in_use == true) {
1075                 dev_err(&port->dev, "qt2_write - urb is in use\n");
1076                 goto write_out;
1077         }
1078
1079         *data++ = QT2_CONTROL_BYTE;
1080         *data++ = QT2_CONTROL_BYTE;
1081         *data++ = port_priv->device_port;
1082         put_unaligned_le16(count, data);
1083         data += 2;
1084         memcpy(data, buf, count);
1085
1086         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
1087
1088         status = usb_submit_urb(write_urb, GFP_ATOMIC);
1089         if (status == 0) {
1090                 port_priv->urb_in_use = true;
1091                 bytes_out += count;
1092         }
1093
1094 write_out:
1095         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1096         return bytes_out;
1097 }
1098
1099
1100 static struct usb_serial_driver qt2_device = {
1101         .driver = {
1102                 .owner = THIS_MODULE,
1103                 .name = "quatech-serial",
1104         },
1105         .description         = DRIVER_DESC,
1106         .id_table            = id_table,
1107         .open                = qt2_open,
1108         .close               = qt2_close,
1109         .write               = qt2_write,
1110         .write_room          = qt2_write_room,
1111         .calc_num_ports      = qt2_calc_num_ports,
1112         .attach              = qt2_attach,
1113         .release             = qt2_release,
1114         .disconnect          = qt2_disconnect,
1115         .port_probe          = qt2_port_probe,
1116         .port_remove         = qt2_port_remove,
1117         .dtr_rts             = qt2_dtr_rts,
1118         .break_ctl           = qt2_break_ctl,
1119         .tiocmget            = qt2_tiocmget,
1120         .tiocmset            = qt2_tiocmset,
1121         .get_icount          = qt2_get_icount,
1122         .ioctl               = qt2_ioctl,
1123         .set_termios         = qt2_set_termios,
1124 };
1125
1126 static struct usb_serial_driver *const serial_drivers[] = {
1127         &qt2_device, NULL
1128 };
1129
1130 module_usb_serial_driver(serial_drivers, id_table);
1131
1132 MODULE_DESCRIPTION(DRIVER_DESC);
1133 MODULE_LICENSE("GPL");