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/slab.h>
  19 #include <linux/tty.h>
  20 #include <linux/tty_driver.h>
  21 #include <linux/tty_flip.h>
  22 #include <linux/module.h>
  23 #include <linux/serial.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/serial.h>
  26 #include <linux/serial_reg.h>
  27 #include <linux/uaccess.h>
  28
  29 /* default urb timeout for usb operations */
  30 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
  31
  32 #define QT_OPEN_CLOSE_CHANNEL       0xca
  33 #define QT_SET_GET_DEVICE           0xc2
  34 #define QT_SET_GET_REGISTER         0xc0
  35 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  36 #define QT_SET_ATF                  0xcd
  37 #define QT_TRANSFER_IN              0xc0
  38 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  39 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  40 #define QT2_BREAK_CONTROL           0xc8
  41 #define QT2_GET_SET_UART            0xc1
  42 #define QT2_FLUSH_DEVICE            0xc4
  43 #define QT2_GET_SET_QMCR            0xe1
  44 #define QT2_QMCR_RS232              0x40
  45 #define QT2_QMCR_RS422              0x10
  46
  47 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
  48
  49 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
  50
  51 /* status bytes for the device */
  52 #define QT2_CONTROL_BYTE    0x1b
  53 #define QT2_LINE_STATUS     0x00  /* following 1 byte is line status */
  54 #define QT2_MODEM_STATUS    0x01  /* following 1 byte is modem status */
  55 #define QT2_XMIT_HOLD       0x02  /* following 2 bytes are ?? */
  56 #define QT2_CHANGE_PORT     0x03  /* following 1 byte is port to change to */
  57 #define QT2_REC_FLUSH       0x04  /* no following info */
  58 #define QT2_XMIT_FLUSH      0x05  /* no following info */
  59 #define QT2_CONTROL_ESCAPE  0xff  /* pass through previous 2 control bytes */
  60
  61 #define  MAX_BAUD_RATE              921600
  62 #define  DEFAULT_BAUD_RATE          9600
  63
  64 #define QT2_READ_BUFFER_SIZE    512  /* size of read buffer */
  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 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
  69
  70 #define USB_VENDOR_ID_QUATECH   0x061d
  71 #define QUATECH_SSU2_100        0xC120  /* RS232 single port */
  72 #define QUATECH_DSU2_100        0xC140  /* RS232 dual port */
  73 #define QUATECH_DSU2_400        0xC150  /* RS232/422/485 dual port */
  74 #define QUATECH_QSU2_100        0xC160  /* RS232 four port */
  75 #define QUATECH_QSU2_400        0xC170  /* RS232/422/485 four port */
  76 #define QUATECH_ESU2_100        0xC1A0  /* RS232 eight port */
  77 #define QUATECH_ESU2_400        0xC180  /* RS232/422/485 eight port */
  78
  79 struct qt2_device_detail {
  80         int product_id;
  81         int num_ports;
  82 };
  83
  84 #define QT_DETAILS(prod, ports) \
  85         .product_id = (prod),   \
  86         .num_ports = (ports)
  87
  88 static const struct qt2_device_detail qt2_device_details[] = {
  89         {QT_DETAILS(QUATECH_SSU2_100, 1)},
  90         {QT_DETAILS(QUATECH_DSU2_400, 2)},
  91         {QT_DETAILS(QUATECH_DSU2_100, 2)},
  92         {QT_DETAILS(QUATECH_QSU2_400, 4)},
  93         {QT_DETAILS(QUATECH_QSU2_100, 4)},
  94         {QT_DETAILS(QUATECH_ESU2_400, 8)},
  95         {QT_DETAILS(QUATECH_ESU2_100, 8)},
  96         {QT_DETAILS(0, 0)}      /* Terminating entry */
  97 };
  98
  99 static const struct usb_device_id id_table[] = {
 100         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
 101         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
 102         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
 103         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
 104         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
 105         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
 106         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
 107         {}                      /* Terminating entry */
 108 };
 109 MODULE_DEVICE_TABLE(usb, id_table);
 110
 111 struct qt2_serial_private {
 112         unsigned char current_port;  /* current port for incoming data */
 113
 114         struct urb      *read_urb;   /* shared among all ports */
 115         char            *read_buffer;
 116 };
 117
 118 struct qt2_port_private {
 119         u8   device_port;
 120
 121         spinlock_t urb_lock;
 122         bool       urb_in_use;
 123         struct urb *write_urb;
 124         char       *write_buffer;
 125
 126         spinlock_t  lock;
 127         u8          shadowLSR;
 128         u8          shadowMSR;
 129
 130         struct usb_serial_port *port;
 131 };
 132
 133 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
 134 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
 135 static void qt2_write_bulk_callback(struct urb *urb);
 136 static void qt2_read_bulk_callback(struct urb *urb);
 137
 138 static void qt2_release(struct usb_serial *serial)
 139 {
 140         struct qt2_serial_private *serial_priv;
 141
 142         serial_priv = usb_get_serial_data(serial);
 143
 144         usb_free_urb(serial_priv->read_urb);
 145         kfree(serial_priv->read_buffer);
 146         kfree(serial_priv);
 147 }
 148
 149 static inline int calc_baud_divisor(int baudrate)
 150 {
 151         int divisor, rem;
 152
 153         divisor = MAX_BAUD_RATE / baudrate;
 154         rem = MAX_BAUD_RATE % baudrate;
 155         /* Round to nearest divisor */
 156         if (((rem * 2) >= baudrate) && (baudrate != 110))
 157                 divisor++;
 158
 159         return divisor;
 160 }
 161
 162 static inline int qt2_set_port_config(struct usb_device *dev,
 163                                       unsigned char port_number,
 164                                       u16 baudrate, u16 lcr)
 165 {
 166         int divisor = calc_baud_divisor(baudrate);
 167         u16 index = ((u16) (lcr << 8) | (u16) (port_number));
 168
 169         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 170                                QT2_GET_SET_UART, 0x40,
 171                                divisor, index, NULL, 0, QT2_USB_TIMEOUT);
 172 }
 173
 174 static inline int qt2_control_msg(struct usb_device *dev,
 175                                   u8 request, u16 data, u16 index)
 176 {
 177         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 178                                request, 0x40, data, index,
 179                                NULL, 0, QT2_USB_TIMEOUT);
 180 }
 181
 182 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
 183 {
 184         u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
 185
 186         return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
 187 }
 188
 189
 190 static inline int qt2_getdevice(struct usb_device *dev, u8 *data)
 191 {
 192         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 193                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
 194                                data, 3, QT2_USB_TIMEOUT);
 195 }
 196
 197 static inline int qt2_getregister(struct usb_device *dev,
 198                                   u8 uart,
 199                                   u8 reg,
 200                                   u8 *data)
 201 {
 202         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 203                                QT_SET_GET_REGISTER, 0xc0, reg,
 204                                uart, data, sizeof(*data), QT2_USB_TIMEOUT);
 205
 206 }
 207
 208 static inline int qt2_setregister(struct usb_device *dev,
 209                                   u8 uart, u8 reg, u16 data)
 210 {
 211         u16 value = (data << 8) | reg;
 212
 213         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 214                                QT_SET_GET_REGISTER, 0x40, value, uart,
 215                                NULL, 0, QT2_USB_TIMEOUT);
 216 }
 217
 218 static inline int update_mctrl(struct qt2_port_private *port_priv,
 219                                unsigned int set, unsigned int clear)
 220 {
 221         struct usb_serial_port *port = port_priv->port;
 222         struct usb_device *dev = port->serial->dev;
 223         unsigned urb_value;
 224         int status;
 225
 226         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 227                 dev_dbg(&port->dev,
 228                         "update_mctrl - DTR|RTS not being set|cleared\n");
 229                 return 0;       /* no change */
 230         }
 231
 232         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 233         urb_value = 0;
 234         if (set & TIOCM_DTR)
 235                 urb_value |= UART_MCR_DTR;
 236         if (set & TIOCM_RTS)
 237                 urb_value |= UART_MCR_RTS;
 238
 239         status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
 240                                  urb_value);
 241         if (status < 0)
 242                 dev_err(&port->dev,
 243                         "update_mctrl - Error from MODEM_CTRL urb: %i\n",
 244                         status);
 245         return status;
 246 }
 247
 248 static int qt2_calc_num_ports(struct usb_serial *serial)
 249 {
 250         struct qt2_device_detail d;
 251         int i;
 252
 253         for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
 254                 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
 255                         return d.num_ports;
 256         }
 257
 258         /* we didn't recognize the device */
 259         dev_err(&serial->dev->dev,
 260                  "don't know the number of ports, assuming 1\n");
 261
 262         return 1;
 263 }
 264
 265 static void qt2_set_termios(struct tty_struct *tty,
 266                             struct usb_serial_port *port,
 267                             struct ktermios *old_termios)
 268 {
 269         struct usb_device *dev = port->serial->dev;
 270         struct qt2_port_private *port_priv;
 271         struct ktermios *termios = &tty->termios;
 272         u16 baud;
 273         unsigned int cflag = termios->c_cflag;
 274         u16 new_lcr = 0;
 275         int status;
 276
 277         port_priv = usb_get_serial_port_data(port);
 278
 279         if (cflag & PARENB) {
 280                 if (cflag & PARODD)
 281                         new_lcr |= UART_LCR_PARITY;
 282                 else
 283                         new_lcr |= SERIAL_EVEN_PARITY;
 284         }
 285
 286         switch (cflag & CSIZE) {
 287         case CS5:
 288                 new_lcr |= UART_LCR_WLEN5;
 289                 break;
 290         case CS6:
 291                 new_lcr |= UART_LCR_WLEN6;
 292                 break;
 293         case CS7:
 294                 new_lcr |= UART_LCR_WLEN7;
 295                 break;
 296         default:
 297         case CS8:
 298                 new_lcr |= UART_LCR_WLEN8;
 299                 break;
 300         }
 301
 302         baud = tty_get_baud_rate(tty);
 303         if (!baud)
 304                 baud = 9600;
 305
 306         status = qt2_set_port_config(dev, port_priv->device_port, baud,
 307                                      new_lcr);
 308         if (status < 0)
 309                 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
 310                         __func__, status);
 311
 312         if (cflag & CRTSCTS)
 313                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 314                                          SERIAL_CRTSCTS,
 315                                          port_priv->device_port);
 316         else
 317                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 318                                          0, port_priv->device_port);
 319         if (status < 0)
 320                 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
 321                         __func__, status);
 322
 323         if (I_IXOFF(tty) || I_IXON(tty)) {
 324                 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
 325
 326                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 327                                          x, port_priv->device_port);
 328         } else
 329                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 330                                          0, port_priv->device_port);
 331
 332         if (status < 0)
 333                 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
 334                         __func__, status);
 335
 336 }
 337
 338 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
 339 {
 340         struct usb_serial *serial;
 341         struct qt2_port_private *port_priv;
 342         u8 *data;
 343         u16 device_port;
 344         int status;
 345         unsigned long flags;
 346
 347         device_port = port->port_number;
 348
 349         serial = port->serial;
 350
 351         port_priv = usb_get_serial_port_data(port);
 352
 353         /* set the port to RS232 mode */
 354         status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
 355                                  QT2_QMCR_RS232, device_port);
 356         if (status < 0) {
 357                 dev_err(&port->dev,
 358                         "%s failed to set RS232 mode for port %i error %i\n",
 359                         __func__, device_port, status);
 360                 return status;
 361         }
 362
 363         data = kzalloc(2, GFP_KERNEL);
 364         if (!data)
 365                 return -ENOMEM;
 366
 367         /* open the port */
 368         status = usb_control_msg(serial->dev,
 369                                  usb_rcvctrlpipe(serial->dev, 0),
 370                                  QT_OPEN_CLOSE_CHANNEL,
 371                                  0xc0, 0,
 372                                  device_port, data, 2, QT2_USB_TIMEOUT);
 373
 374         if (status < 0) {
 375                 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
 376                         status);
 377                 kfree(data);
 378                 return status;
 379         }
 380
 381         spin_lock_irqsave(&port_priv->lock, flags);
 382         port_priv->shadowLSR = data[0];
 383         port_priv->shadowMSR = data[1];
 384         spin_unlock_irqrestore(&port_priv->lock, flags);
 385
 386         kfree(data);
 387
 388         /* set to default speed and 8bit word size */
 389         status = qt2_set_port_config(serial->dev, device_port,
 390                                      DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
 391         if (status < 0) {
 392                 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
 393                         __func__, device_port);
 394                 return status;
 395         }
 396
 397         port_priv->device_port = (u8) device_port;
 398
 399         if (tty)
 400                 qt2_set_termios(tty, port, &tty->termios);
 401
 402         return 0;
 403
 404 }
 405
 406 static void qt2_close(struct usb_serial_port *port)
 407 {
 408         struct usb_serial *serial;
 409         struct qt2_port_private *port_priv;
 410         unsigned long flags;
 411         int i;
 412
 413         serial = port->serial;
 414         port_priv = usb_get_serial_port_data(port);
 415
 416         spin_lock_irqsave(&port_priv->urb_lock, flags);
 417         usb_kill_urb(port_priv->write_urb);
 418         port_priv->urb_in_use = false;
 419         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 420
 421         /* flush the port transmit buffer */
 422         i = usb_control_msg(serial->dev,
 423                             usb_rcvctrlpipe(serial->dev, 0),
 424                             QT2_FLUSH_DEVICE, 0x40, 1,
 425                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 426
 427         if (i < 0)
 428                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
 429                         __func__, i);
 430
 431         /* flush the port receive buffer */
 432         i = usb_control_msg(serial->dev,
 433                             usb_rcvctrlpipe(serial->dev, 0),
 434                             QT2_FLUSH_DEVICE, 0x40, 0,
 435                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 436
 437         if (i < 0)
 438                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
 439                         __func__, i);
 440
 441         /* close the port */
 442         i = usb_control_msg(serial->dev,
 443                             usb_sndctrlpipe(serial->dev, 0),
 444                             QT_OPEN_CLOSE_CHANNEL,
 445                             0x40, 0,
 446                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 447
 448         if (i < 0)
 449                 dev_err(&port->dev, "%s - close port failed %i\n",
 450                         __func__, i);
 451 }
 452
 453 static void qt2_disconnect(struct usb_serial *serial)
 454 {
 455         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
 456
 457         usb_kill_urb(serial_priv->read_urb);
 458 }
 459
 460 static int get_serial_info(struct usb_serial_port *port,
 461                            struct serial_struct __user *retinfo)
 462 {
 463         struct serial_struct tmp;
 464
 465         if (!retinfo)
 466                 return -EFAULT;
 467
 468         memset(&tmp, 0, sizeof(tmp));
 469         tmp.line                = port->minor;
 470         tmp.port                = 0;
 471         tmp.irq                 = 0;
 472         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 473         tmp.xmit_fifo_size      = port->bulk_out_size;
 474         tmp.baud_base           = 9600;
 475         tmp.close_delay         = 5*HZ;
 476         tmp.closing_wait        = 30*HZ;
 477
 478         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 479                 return -EFAULT;
 480         return 0;
 481 }
 482
 483 static int qt2_ioctl(struct tty_struct *tty,
 484                      unsigned int cmd, unsigned long arg)
 485 {
 486         struct usb_serial_port *port = tty->driver_data;
 487
 488         switch (cmd) {
 489         case TIOCGSERIAL:
 490                 return get_serial_info(port,
 491                                        (struct serial_struct __user *)arg);
 492         default:
 493                 break;
 494         }
 495
 496         return -ENOIOCTLCMD;
 497 }
 498
 499 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
 500 {
 501         switch (*ch) {
 502         case QT2_LINE_STATUS:
 503                 qt2_update_lsr(port, ch + 1);
 504                 break;
 505         case QT2_MODEM_STATUS:
 506                 qt2_update_msr(port, ch + 1);
 507                 break;
 508         }
 509 }
 510
 511 /* not needed, kept to document functionality */
 512 static void qt2_process_xmit_empty(struct usb_serial_port *port,
 513                                    unsigned char *ch)
 514 {
 515         int bytes_written;
 516
 517         bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
 518 }
 519
 520 /* not needed, kept to document functionality */
 521 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
 522 {
 523         return;
 524 }
 525
 526 static void qt2_process_read_urb(struct urb *urb)
 527 {
 528         struct usb_serial *serial;
 529         struct qt2_serial_private *serial_priv;
 530         struct usb_serial_port *port;
 531         struct qt2_port_private *port_priv;
 532         bool escapeflag;
 533         unsigned char *ch;
 534         int i;
 535         unsigned char newport;
 536         int len = urb->actual_length;
 537
 538         if (!len)
 539                 return;
 540
 541         ch = urb->transfer_buffer;
 542         serial = urb->context;
 543         serial_priv = usb_get_serial_data(serial);
 544         port = serial->port[serial_priv->current_port];
 545         port_priv = usb_get_serial_port_data(port);
 546
 547         for (i = 0; i < urb->actual_length; i++) {
 548                 ch = (unsigned char *)urb->transfer_buffer + i;
 549                 if ((i <= (len - 3)) &&
 550                     (*ch == QT2_CONTROL_BYTE) &&
 551                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
 552                         escapeflag = false;
 553                         switch (*(ch + 2)) {
 554                         case QT2_LINE_STATUS:
 555                         case QT2_MODEM_STATUS:
 556                                 if (i > (len - 4)) {
 557                                         dev_warn(&port->dev,
 558                                                  "%s - status message too short\n",
 559                                                 __func__);
 560                                         break;
 561                                 }
 562                                 qt2_process_status(port, ch + 2);
 563                                 i += 3;
 564                                 escapeflag = true;
 565                                 break;
 566                         case QT2_XMIT_HOLD:
 567                                 if (i > (len - 5)) {
 568                                         dev_warn(&port->dev,
 569                                                  "%s - xmit_empty message too short\n",
 570                                                  __func__);
 571                                         break;
 572                                 }
 573                                 qt2_process_xmit_empty(port, ch + 3);
 574                                 i += 4;
 575                                 escapeflag = true;
 576                                 break;
 577                         case QT2_CHANGE_PORT:
 578                                 if (i > (len - 4)) {
 579                                         dev_warn(&port->dev,
 580                                                  "%s - change_port message too short\n",
 581                                                  __func__);
 582                                         break;
 583                                 }
 584                                 tty_flip_buffer_push(&port->port);
 585
 586                                 newport = *(ch + 3);
 587
 588                                 if (newport > serial->num_ports) {
 589                                         dev_err(&port->dev,
 590                                                 "%s - port change to invalid port: %i\n",
 591                                                 __func__, newport);
 592                                         break;
 593                                 }
 594
 595                                 serial_priv->current_port = newport;
 596                                 port = serial->port[serial_priv->current_port];
 597                                 port_priv = usb_get_serial_port_data(port);
 598                                 i += 3;
 599                                 escapeflag = true;
 600                                 break;
 601                         case QT2_REC_FLUSH:
 602                         case QT2_XMIT_FLUSH:
 603                                 qt2_process_flush(port, ch + 2);
 604                                 i += 2;
 605                                 escapeflag = true;
 606                                 break;
 607                         case QT2_CONTROL_ESCAPE:
 608                                 tty_buffer_request_room(&port->port, 2);
 609                                 tty_insert_flip_string(&port->port, ch, 2);
 610                                 i += 2;
 611                                 escapeflag = true;
 612                                 break;
 613                         default:
 614                                 dev_warn(&port->dev,
 615                                          "%s - unsupported command %i\n",
 616                                          __func__, *(ch + 2));
 617                                 break;
 618                         }
 619                         if (escapeflag)
 620                                 continue;
 621                 }
 622
 623                 tty_buffer_request_room(&port->port, 1);
 624                 tty_insert_flip_string(&port->port, ch, 1);
 625         }
 626
 627         tty_flip_buffer_push(&port->port);
 628 }
 629
 630 static void qt2_write_bulk_callback(struct urb *urb)
 631 {
 632         struct usb_serial_port *port;
 633         struct qt2_port_private *port_priv;
 634
 635         port = urb->context;
 636         port_priv = usb_get_serial_port_data(port);
 637
 638         spin_lock(&port_priv->urb_lock);
 639
 640         port_priv->urb_in_use = false;
 641         usb_serial_port_softint(port);
 642
 643         spin_unlock(&port_priv->urb_lock);
 644
 645 }
 646
 647 static void qt2_read_bulk_callback(struct urb *urb)
 648 {
 649         struct usb_serial *serial = urb->context;
 650         int status;
 651
 652         if (urb->status) {
 653                 dev_warn(&serial->dev->dev,
 654                          "%s - non-zero urb status: %i\n", __func__,
 655                          urb->status);
 656                 return;
 657         }
 658
 659         qt2_process_read_urb(urb);
 660
 661         status = usb_submit_urb(urb, GFP_ATOMIC);
 662         if (status != 0)
 663                 dev_err(&serial->dev->dev,
 664                         "%s - resubmit read urb failed: %i\n",
 665                         __func__, status);
 666 }
 667
 668 static int qt2_setup_urbs(struct usb_serial *serial)
 669 {
 670         struct usb_serial_port *port0;
 671         struct qt2_serial_private *serial_priv;
 672         int status;
 673
 674         port0 = serial->port[0];
 675
 676         serial_priv = usb_get_serial_data(serial);
 677         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 678         if (!serial_priv->read_urb)
 679                 return -ENOMEM;
 680
 681         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
 682                           usb_rcvbulkpipe(serial->dev,
 683                                           port0->bulk_in_endpointAddress),
 684                           serial_priv->read_buffer,
 685                           QT2_READ_BUFFER_SIZE,
 686                           qt2_read_bulk_callback, serial);
 687
 688         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
 689         if (status != 0) {
 690                 dev_err(&serial->dev->dev,
 691                         "%s - submit read urb failed %i\n", __func__, status);
 692                 usb_free_urb(serial_priv->read_urb);
 693                 return status;
 694         }
 695
 696         return 0;
 697 }
 698
 699 static int qt2_attach(struct usb_serial *serial)
 700 {
 701         struct qt2_serial_private *serial_priv;
 702         int status;
 703
 704         /* power on unit */
 705         status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 706                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
 707                                  QT2_USB_TIMEOUT);
 708         if (status < 0) {
 709                 dev_err(&serial->dev->dev,
 710                         "%s - failed to power on unit: %i\n", __func__, status);
 711                 return status;
 712         }
 713
 714         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 715         if (!serial_priv)
 716                 return -ENOMEM;
 717
 718         serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
 719         if (!serial_priv->read_buffer) {
 720                 status = -ENOMEM;
 721                 goto err_buf;
 722         }
 723
 724         usb_set_serial_data(serial, serial_priv);
 725
 726         status = qt2_setup_urbs(serial);
 727         if (status != 0)
 728                 goto attach_failed;
 729
 730         return 0;
 731
 732 attach_failed:
 733         kfree(serial_priv->read_buffer);
 734 err_buf:
 735         kfree(serial_priv);
 736         return status;
 737 }
 738
 739 static int qt2_port_probe(struct usb_serial_port *port)
 740 {
 741         struct usb_serial *serial = port->serial;
 742         struct qt2_port_private *port_priv;
 743         u8 bEndpointAddress;
 744
 745         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
 746         if (!port_priv)
 747                 return -ENOMEM;
 748
 749         spin_lock_init(&port_priv->lock);
 750         spin_lock_init(&port_priv->urb_lock);
 751         port_priv->port = port;
 752
 753         port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
 754         if (!port_priv->write_buffer)
 755                 goto err_buf;
 756
 757         port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 758         if (!port_priv->write_urb)
 759                 goto err_urb;
 760
 761         bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
 762         usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
 763                                 usb_sndbulkpipe(serial->dev, bEndpointAddress),
 764                                 port_priv->write_buffer,
 765                                 QT2_WRITE_BUFFER_SIZE,
 766                                 qt2_write_bulk_callback, port);
 767
 768         usb_set_serial_port_data(port, port_priv);
 769
 770         return 0;
 771 err_urb:
 772         kfree(port_priv->write_buffer);
 773 err_buf:
 774         kfree(port_priv);
 775         return -ENOMEM;
 776 }
 777
 778 static int qt2_port_remove(struct usb_serial_port *port)
 779 {
 780         struct qt2_port_private *port_priv;
 781
 782         port_priv = usb_get_serial_port_data(port);
 783         usb_free_urb(port_priv->write_urb);
 784         kfree(port_priv->write_buffer);
 785         kfree(port_priv);
 786
 787         return 0;
 788 }
 789
 790 static int qt2_tiocmget(struct tty_struct *tty)
 791 {
 792         struct usb_serial_port *port = tty->driver_data;
 793         struct usb_device *dev = port->serial->dev;
 794         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 795         u8 *d;
 796         int r;
 797
 798         d = kzalloc(2, GFP_KERNEL);
 799         if (!d)
 800                 return -ENOMEM;
 801
 802         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
 803         if (r < 0)
 804                 goto mget_out;
 805
 806         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
 807         if (r < 0)
 808                 goto mget_out;
 809
 810         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 811             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 812             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 813             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 814             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 815             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 816
 817 mget_out:
 818         kfree(d);
 819         return r;
 820 }
 821
 822 static int qt2_tiocmset(struct tty_struct *tty,
 823                         unsigned int set, unsigned int clear)
 824 {
 825         struct qt2_port_private *port_priv;
 826
 827         port_priv = usb_get_serial_port_data(tty->driver_data);
 828         return update_mctrl(port_priv, set, clear);
 829 }
 830
 831 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
 832 {
 833         struct usb_serial_port *port = tty->driver_data;
 834         struct qt2_port_private *port_priv;
 835         int status;
 836         u16 val;
 837
 838         port_priv = usb_get_serial_port_data(port);
 839
 840         val = (break_state == -1) ? 1 : 0;
 841
 842         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
 843                                  val, port_priv->device_port);
 844         if (status < 0)
 845                 dev_warn(&port->dev,
 846                          "%s - failed to send control message: %i\n", __func__,
 847                          status);
 848 }
 849
 850
 851
 852 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
 853 {
 854         struct usb_device *dev = port->serial->dev;
 855         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 856
 857         /* Disable flow control */
 858         if (!on) {
 859                 if (qt2_setregister(dev, port_priv->device_port,
 860                                            UART_MCR, 0) < 0)
 861                         dev_warn(&port->dev, "error from flowcontrol urb\n");
 862         }
 863         /* drop RTS and DTR */
 864         if (on)
 865                 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
 866         else
 867                 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 868 }
 869
 870 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
 871 {
 872         struct qt2_port_private *port_priv;
 873         u8 newMSR = (u8) *ch;
 874         unsigned long flags;
 875
 876         port_priv = usb_get_serial_port_data(port);
 877
 878         spin_lock_irqsave(&port_priv->lock, flags);
 879         port_priv->shadowMSR = newMSR;
 880         spin_unlock_irqrestore(&port_priv->lock, flags);
 881
 882         if (newMSR & UART_MSR_ANY_DELTA) {
 883                 /* update input line counters */
 884                 if (newMSR & UART_MSR_DCTS)
 885                         port->icount.cts++;
 886                 if (newMSR & UART_MSR_DDSR)
 887                         port->icount.dsr++;
 888                 if (newMSR & UART_MSR_DDCD)
 889                         port->icount.dcd++;
 890                 if (newMSR & UART_MSR_TERI)
 891                         port->icount.rng++;
 892
 893                 wake_up_interruptible(&port->port.delta_msr_wait);
 894         }
 895 }
 896
 897 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
 898 {
 899         struct qt2_port_private *port_priv;
 900         struct async_icount *icount;
 901         unsigned long flags;
 902         u8 newLSR = (u8) *ch;
 903
 904         port_priv = usb_get_serial_port_data(port);
 905
 906         if (newLSR & UART_LSR_BI)
 907                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
 908
 909         spin_lock_irqsave(&port_priv->lock, flags);
 910         port_priv->shadowLSR = newLSR;
 911         spin_unlock_irqrestore(&port_priv->lock, flags);
 912
 913         icount = &port->icount;
 914
 915         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
 916
 917                 if (newLSR & UART_LSR_BI)
 918                         icount->brk++;
 919
 920                 if (newLSR & UART_LSR_OE)
 921                         icount->overrun++;
 922
 923                 if (newLSR & UART_LSR_PE)
 924                         icount->parity++;
 925
 926                 if (newLSR & UART_LSR_FE)
 927                         icount->frame++;
 928         }
 929
 930 }
 931
 932 static int qt2_write_room(struct tty_struct *tty)
 933 {
 934         struct usb_serial_port *port = tty->driver_data;
 935         struct qt2_port_private *port_priv;
 936         unsigned long flags = 0;
 937         int r;
 938
 939         port_priv = usb_get_serial_port_data(port);
 940
 941         spin_lock_irqsave(&port_priv->urb_lock, flags);
 942
 943         if (port_priv->urb_in_use)
 944                 r = 0;
 945         else
 946                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
 947
 948         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 949
 950         return r;
 951 }
 952
 953 static int qt2_write(struct tty_struct *tty,
 954                      struct usb_serial_port *port,
 955                      const unsigned char *buf, int count)
 956 {
 957         struct qt2_port_private *port_priv;
 958         struct urb *write_urb;
 959         unsigned char *data;
 960         unsigned long flags;
 961         int status;
 962         int bytes_out = 0;
 963
 964         port_priv = usb_get_serial_port_data(port);
 965
 966         if (port_priv->write_urb == NULL) {
 967                 dev_err(&port->dev, "%s - no output urb\n", __func__);
 968                 return 0;
 969         }
 970         write_urb = port_priv->write_urb;
 971
 972         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
 973
 974         data = write_urb->transfer_buffer;
 975         spin_lock_irqsave(&port_priv->urb_lock, flags);
 976         if (port_priv->urb_in_use == true) {
 977                 dev_err(&port->dev, "qt2_write - urb is in use\n");
 978                 goto write_out;
 979         }
 980
 981         *data++ = QT2_CONTROL_BYTE;
 982         *data++ = QT2_CONTROL_BYTE;
 983         *data++ = port_priv->device_port;
 984         put_unaligned_le16(count, data);
 985         data += 2;
 986         memcpy(data, buf, count);
 987
 988         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
 989
 990         status = usb_submit_urb(write_urb, GFP_ATOMIC);
 991         if (status == 0) {
 992                 port_priv->urb_in_use = true;
 993                 bytes_out += count;
 994         }
 995
 996 write_out:
 997         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 998         return bytes_out;
 999 }
1000
1001
1002 static struct usb_serial_driver qt2_device = {
1003         .driver = {
1004                 .owner = THIS_MODULE,
1005                 .name = "quatech-serial",
1006         },
1007         .description         = DRIVER_DESC,
1008         .id_table            = id_table,
1009         .open                = qt2_open,
1010         .close               = qt2_close,
1011         .write               = qt2_write,
1012         .write_room          = qt2_write_room,
1013         .calc_num_ports      = qt2_calc_num_ports,
1014         .attach              = qt2_attach,
1015         .release             = qt2_release,
1016         .disconnect          = qt2_disconnect,
1017         .port_probe          = qt2_port_probe,
1018         .port_remove         = qt2_port_remove,
1019         .dtr_rts             = qt2_dtr_rts,
1020         .break_ctl           = qt2_break_ctl,
1021         .tiocmget            = qt2_tiocmget,
1022         .tiocmset            = qt2_tiocmset,
1023         .tiocmiwait          = usb_serial_generic_tiocmiwait,
1024         .get_icount          = usb_serial_generic_get_icount,
1025         .ioctl               = qt2_ioctl,
1026         .set_termios         = qt2_set_termios,
1027 };
1028
1029 static struct usb_serial_driver *const serial_drivers[] = {
1030         &qt2_device, NULL
1031 };
1032
1033 module_usb_serial_driver(serial_drivers, id_table);
1034
1035 MODULE_DESCRIPTION(DRIVER_DESC);
1036 MODULE_LICENSE("GPL");