drivers/usb/serial/quatech2.c

   1 /*
   2  * usb-serial driver for Quatech USB 2 devices
   3  *
   4  * Copyright (C) 2012 Bill Pemberton ([email protected])
   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_kill_urb(serial_priv->read_urb);
 145         usb_free_urb(serial_priv->read_urb);
 146         kfree(serial_priv->read_buffer);
 147         kfree(serial_priv);
 148 }
 149
 150 static inline int calc_baud_divisor(int baudrate)
 151 {
 152         int divisor, rem;
 153
 154         divisor = MAX_BAUD_RATE / baudrate;
 155         rem = MAX_BAUD_RATE % baudrate;
 156         /* Round to nearest divisor */
 157         if (((rem * 2) >= baudrate) && (baudrate != 110))
 158                 divisor++;
 159
 160         return divisor;
 161 }
 162
 163 static inline int qt2_set_port_config(struct usb_device *dev,
 164                                       unsigned char port_number,
 165                                       u16 baudrate, u16 lcr)
 166 {
 167         int divisor = calc_baud_divisor(baudrate);
 168         u16 index = ((u16) (lcr << 8) | (u16) (port_number));
 169
 170         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 171                                QT2_GET_SET_UART, 0x40,
 172                                divisor, index, NULL, 0, QT2_USB_TIMEOUT);
 173 }
 174
 175 static inline int qt2_control_msg(struct usb_device *dev,
 176                                   u8 request, u16 data, u16 index)
 177 {
 178         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 179                                request, 0x40, data, index,
 180                                NULL, 0, QT2_USB_TIMEOUT);
 181 }
 182
 183 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
 184 {
 185         u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
 186
 187         return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
 188 }
 189
 190
 191 static inline int qt2_getregister(struct usb_device *dev,
 192                                   u8 uart,
 193                                   u8 reg,
 194                                   u8 *data)
 195 {
 196         int ret;
 197
 198         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 199                               QT_SET_GET_REGISTER, 0xc0, reg,
 200                               uart, data, sizeof(*data), QT2_USB_TIMEOUT);
 201         if (ret < sizeof(*data)) {
 202                 if (ret >= 0)
 203                         ret = -EIO;
 204         }
 205
 206         return ret;
 207 }
 208
 209 static inline int qt2_setregister(struct usb_device *dev,
 210                                   u8 uart, u8 reg, u16 data)
 211 {
 212         u16 value = (data << 8) | reg;
 213
 214         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 215                                QT_SET_GET_REGISTER, 0x40, value, uart,
 216                                NULL, 0, QT2_USB_TIMEOUT);
 217 }
 218
 219 static inline int update_mctrl(struct qt2_port_private *port_priv,
 220                                unsigned int set, unsigned int clear)
 221 {
 222         struct usb_serial_port *port = port_priv->port;
 223         struct usb_device *dev = port->serial->dev;
 224         unsigned urb_value;
 225         int status;
 226
 227         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 228                 dev_dbg(&port->dev,
 229                         "update_mctrl - DTR|RTS not being set|cleared\n");
 230                 return 0;       /* no change */
 231         }
 232
 233         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 234         urb_value = 0;
 235         if (set & TIOCM_DTR)
 236                 urb_value |= UART_MCR_DTR;
 237         if (set & TIOCM_RTS)
 238                 urb_value |= UART_MCR_RTS;
 239
 240         status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
 241                                  urb_value);
 242         if (status < 0)
 243                 dev_err(&port->dev,
 244                         "update_mctrl - Error from MODEM_CTRL urb: %i\n",
 245                         status);
 246         return status;
 247 }
 248
 249 static int qt2_calc_num_ports(struct usb_serial *serial)
 250 {
 251         struct qt2_device_detail d;
 252         int i;
 253
 254         for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
 255                 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
 256                         return d.num_ports;
 257         }
 258
 259         /* we didn't recognize the device */
 260         dev_err(&serial->dev->dev,
 261                  "don't know the number of ports, assuming 1\n");
 262
 263         return 1;
 264 }
 265
 266 static void qt2_set_termios(struct tty_struct *tty,
 267                             struct usb_serial_port *port,
 268                             struct ktermios *old_termios)
 269 {
 270         struct usb_device *dev = port->serial->dev;
 271         struct qt2_port_private *port_priv;
 272         struct ktermios *termios = &tty->termios;
 273         u16 baud;
 274         unsigned int cflag = termios->c_cflag;
 275         u16 new_lcr = 0;
 276         int status;
 277
 278         port_priv = usb_get_serial_port_data(port);
 279
 280         if (cflag & PARENB) {
 281                 if (cflag & PARODD)
 282                         new_lcr |= UART_LCR_PARITY;
 283                 else
 284                         new_lcr |= SERIAL_EVEN_PARITY;
 285         }
 286
 287         switch (cflag & CSIZE) {
 288         case CS5:
 289                 new_lcr |= UART_LCR_WLEN5;
 290                 break;
 291         case CS6:
 292                 new_lcr |= UART_LCR_WLEN6;
 293                 break;
 294         case CS7:
 295                 new_lcr |= UART_LCR_WLEN7;
 296                 break;
 297         default:
 298         case CS8:
 299                 new_lcr |= UART_LCR_WLEN8;
 300                 break;
 301         }
 302
 303         baud = tty_get_baud_rate(tty);
 304         if (!baud)
 305                 baud = 9600;
 306
 307         status = qt2_set_port_config(dev, port_priv->device_port, baud,
 308                                      new_lcr);
 309         if (status < 0)
 310                 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
 311                         __func__, status);
 312
 313         if (cflag & CRTSCTS)
 314                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 315                                          SERIAL_CRTSCTS,
 316                                          port_priv->device_port);
 317         else
 318                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 319                                          0, port_priv->device_port);
 320         if (status < 0)
 321                 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
 322                         __func__, status);
 323
 324         if (I_IXOFF(tty) || I_IXON(tty)) {
 325                 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
 326
 327                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 328                                          x, port_priv->device_port);
 329         } else
 330                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 331                                          0, port_priv->device_port);
 332
 333         if (status < 0)
 334                 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
 335                         __func__, status);
 336
 337 }
 338
 339 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
 340 {
 341         struct usb_serial *serial;
 342         struct qt2_port_private *port_priv;
 343         u8 *data;
 344         u16 device_port;
 345         int status;
 346         unsigned long flags;
 347
 348         device_port = port->port_number;
 349
 350         serial = port->serial;
 351
 352         port_priv = usb_get_serial_port_data(port);
 353
 354         /* set the port to RS232 mode */
 355         status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
 356                                  QT2_QMCR_RS232, device_port);
 357         if (status < 0) {
 358                 dev_err(&port->dev,
 359                         "%s failed to set RS232 mode for port %i error %i\n",
 360                         __func__, device_port, status);
 361                 return status;
 362         }
 363
 364         data = kzalloc(2, GFP_KERNEL);
 365         if (!data)
 366                 return -ENOMEM;
 367
 368         /* open the port */
 369         status = usb_control_msg(serial->dev,
 370                                  usb_rcvctrlpipe(serial->dev, 0),
 371                                  QT_OPEN_CLOSE_CHANNEL,
 372                                  0xc0, 0,
 373                                  device_port, data, 2, QT2_USB_TIMEOUT);
 374
 375         if (status < 2) {
 376                 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
 377                         status);
 378                 if (status >= 0)
 379                         status = -EIO;
 380                 kfree(data);
 381                 return status;
 382         }
 383
 384         spin_lock_irqsave(&port_priv->lock, flags);
 385         port_priv->shadowLSR = data[0];
 386         port_priv->shadowMSR = data[1];
 387         spin_unlock_irqrestore(&port_priv->lock, flags);
 388
 389         kfree(data);
 390
 391         /* set to default speed and 8bit word size */
 392         status = qt2_set_port_config(serial->dev, device_port,
 393                                      DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
 394         if (status < 0) {
 395                 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
 396                         __func__, device_port);
 397                 return status;
 398         }
 399
 400         port_priv->device_port = (u8) device_port;
 401
 402         if (tty)
 403                 qt2_set_termios(tty, port, &tty->termios);
 404
 405         return 0;
 406
 407 }
 408
 409 static void qt2_close(struct usb_serial_port *port)
 410 {
 411         struct usb_serial *serial;
 412         struct qt2_port_private *port_priv;
 413         int i;
 414
 415         serial = port->serial;
 416         port_priv = usb_get_serial_port_data(port);
 417
 418         usb_kill_urb(port_priv->write_urb);
 419
 420         /* flush the port transmit buffer */
 421         i = usb_control_msg(serial->dev,
 422                             usb_rcvctrlpipe(serial->dev, 0),
 423                             QT2_FLUSH_DEVICE, 0x40, 1,
 424                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 425
 426         if (i < 0)
 427                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
 428                         __func__, i);
 429
 430         /* flush the port receive buffer */
 431         i = usb_control_msg(serial->dev,
 432                             usb_rcvctrlpipe(serial->dev, 0),
 433                             QT2_FLUSH_DEVICE, 0x40, 0,
 434                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 435
 436         if (i < 0)
 437                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
 438                         __func__, i);
 439
 440         /* close the port */
 441         i = usb_control_msg(serial->dev,
 442                             usb_sndctrlpipe(serial->dev, 0),
 443                             QT_OPEN_CLOSE_CHANNEL,
 444                             0x40, 0,
 445                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 446
 447         if (i < 0)
 448                 dev_err(&port->dev, "%s - close port failed %i\n",
 449                         __func__, i);
 450 }
 451
 452 static void qt2_disconnect(struct usb_serial *serial)
 453 {
 454         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
 455
 456         usb_kill_urb(serial_priv->read_urb);
 457 }
 458
 459 static int get_serial_info(struct usb_serial_port *port,
 460                            struct serial_struct __user *retinfo)
 461 {
 462         struct serial_struct tmp;
 463
 464         memset(&tmp, 0, sizeof(tmp));
 465         tmp.line                = port->minor;
 466         tmp.port                = 0;
 467         tmp.irq                 = 0;
 468         tmp.xmit_fifo_size      = port->bulk_out_size;
 469         tmp.baud_base           = 9600;
 470         tmp.close_delay         = 5*HZ;
 471         tmp.closing_wait        = 30*HZ;
 472
 473         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 474                 return -EFAULT;
 475         return 0;
 476 }
 477
 478 static int qt2_ioctl(struct tty_struct *tty,
 479                      unsigned int cmd, unsigned long arg)
 480 {
 481         struct usb_serial_port *port = tty->driver_data;
 482
 483         switch (cmd) {
 484         case TIOCGSERIAL:
 485                 return get_serial_info(port,
 486                                        (struct serial_struct __user *)arg);
 487         default:
 488                 break;
 489         }
 490
 491         return -ENOIOCTLCMD;
 492 }
 493
 494 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
 495 {
 496         switch (*ch) {
 497         case QT2_LINE_STATUS:
 498                 qt2_update_lsr(port, ch + 1);
 499                 break;
 500         case QT2_MODEM_STATUS:
 501                 qt2_update_msr(port, ch + 1);
 502                 break;
 503         }
 504 }
 505
 506 /* not needed, kept to document functionality */
 507 static void qt2_process_xmit_empty(struct usb_serial_port *port,
 508                                    unsigned char *ch)
 509 {
 510         int bytes_written;
 511
 512         bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
 513 }
 514
 515 /* not needed, kept to document functionality */
 516 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
 517 {
 518         return;
 519 }
 520
 521 static void qt2_process_read_urb(struct urb *urb)
 522 {
 523         struct usb_serial *serial;
 524         struct qt2_serial_private *serial_priv;
 525         struct usb_serial_port *port;
 526         struct qt2_port_private *port_priv;
 527         bool escapeflag;
 528         unsigned char *ch;
 529         int i;
 530         unsigned char newport;
 531         int len = urb->actual_length;
 532
 533         if (!len)
 534                 return;
 535
 536         ch = urb->transfer_buffer;
 537         serial = urb->context;
 538         serial_priv = usb_get_serial_data(serial);
 539         port = serial->port[serial_priv->current_port];
 540         port_priv = usb_get_serial_port_data(port);
 541
 542         for (i = 0; i < urb->actual_length; i++) {
 543                 ch = (unsigned char *)urb->transfer_buffer + i;
 544                 if ((i <= (len - 3)) &&
 545                     (*ch == QT2_CONTROL_BYTE) &&
 546                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
 547                         escapeflag = false;
 548                         switch (*(ch + 2)) {
 549                         case QT2_LINE_STATUS:
 550                         case QT2_MODEM_STATUS:
 551                                 if (i > (len - 4)) {
 552                                         dev_warn(&port->dev,
 553                                                  "%s - status message too short\n",
 554                                                 __func__);
 555                                         break;
 556                                 }
 557                                 qt2_process_status(port, ch + 2);
 558                                 i += 3;
 559                                 escapeflag = true;
 560                                 break;
 561                         case QT2_XMIT_HOLD:
 562                                 if (i > (len - 5)) {
 563                                         dev_warn(&port->dev,
 564                                                  "%s - xmit_empty message too short\n",
 565                                                  __func__);
 566                                         break;
 567                                 }
 568                                 qt2_process_xmit_empty(port, ch + 3);
 569                                 i += 4;
 570                                 escapeflag = true;
 571                                 break;
 572                         case QT2_CHANGE_PORT:
 573                                 if (i > (len - 4)) {
 574                                         dev_warn(&port->dev,
 575                                                  "%s - change_port message too short\n",
 576                                                  __func__);
 577                                         break;
 578                                 }
 579                                 tty_flip_buffer_push(&port->port);
 580
 581                                 newport = *(ch + 3);
 582
 583                                 if (newport > serial->num_ports) {
 584                                         dev_err(&port->dev,
 585                                                 "%s - port change to invalid port: %i\n",
 586                                                 __func__, newport);
 587                                         break;
 588                                 }
 589
 590                                 serial_priv->current_port = newport;
 591                                 port = serial->port[serial_priv->current_port];
 592                                 port_priv = usb_get_serial_port_data(port);
 593                                 i += 3;
 594                                 escapeflag = true;
 595                                 break;
 596                         case QT2_REC_FLUSH:
 597                         case QT2_XMIT_FLUSH:
 598                                 qt2_process_flush(port, ch + 2);
 599                                 i += 2;
 600                                 escapeflag = true;
 601                                 break;
 602                         case QT2_CONTROL_ESCAPE:
 603                                 tty_buffer_request_room(&port->port, 2);
 604                                 tty_insert_flip_string(&port->port, ch, 2);
 605                                 i += 2;
 606                                 escapeflag = true;
 607                                 break;
 608                         default:
 609                                 dev_warn(&port->dev,
 610                                          "%s - unsupported command %i\n",
 611                                          __func__, *(ch + 2));
 612                                 break;
 613                         }
 614                         if (escapeflag)
 615                                 continue;
 616                 }
 617
 618                 tty_buffer_request_room(&port->port, 1);
 619                 tty_insert_flip_string(&port->port, ch, 1);
 620         }
 621
 622         tty_flip_buffer_push(&port->port);
 623 }
 624
 625 static void qt2_write_bulk_callback(struct urb *urb)
 626 {
 627         struct usb_serial_port *port;
 628         struct qt2_port_private *port_priv;
 629
 630         port = urb->context;
 631         port_priv = usb_get_serial_port_data(port);
 632
 633         spin_lock(&port_priv->urb_lock);
 634
 635         port_priv->urb_in_use = false;
 636         usb_serial_port_softint(port);
 637
 638         spin_unlock(&port_priv->urb_lock);
 639
 640 }
 641
 642 static void qt2_read_bulk_callback(struct urb *urb)
 643 {
 644         struct usb_serial *serial = urb->context;
 645         int status;
 646
 647         if (urb->status) {
 648                 dev_warn(&serial->dev->dev,
 649                          "%s - non-zero urb status: %i\n", __func__,
 650                          urb->status);
 651                 return;
 652         }
 653
 654         qt2_process_read_urb(urb);
 655
 656         status = usb_submit_urb(urb, GFP_ATOMIC);
 657         if (status != 0)
 658                 dev_err(&serial->dev->dev,
 659                         "%s - resubmit read urb failed: %i\n",
 660                         __func__, status);
 661 }
 662
 663 static int qt2_setup_urbs(struct usb_serial *serial)
 664 {
 665         struct usb_serial_port *port0;
 666         struct qt2_serial_private *serial_priv;
 667         int status;
 668
 669         port0 = serial->port[0];
 670
 671         serial_priv = usb_get_serial_data(serial);
 672         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 673         if (!serial_priv->read_urb)
 674                 return -ENOMEM;
 675
 676         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
 677                           usb_rcvbulkpipe(serial->dev,
 678                                           port0->bulk_in_endpointAddress),
 679                           serial_priv->read_buffer,
 680                           QT2_READ_BUFFER_SIZE,
 681                           qt2_read_bulk_callback, serial);
 682
 683         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
 684         if (status != 0) {
 685                 dev_err(&serial->dev->dev,
 686                         "%s - submit read urb failed %i\n", __func__, status);
 687                 usb_free_urb(serial_priv->read_urb);
 688                 return status;
 689         }
 690
 691         return 0;
 692 }
 693
 694 static int qt2_attach(struct usb_serial *serial)
 695 {
 696         struct qt2_serial_private *serial_priv;
 697         int status;
 698
 699         /* power on unit */
 700         status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 701                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
 702                                  QT2_USB_TIMEOUT);
 703         if (status < 0) {
 704                 dev_err(&serial->dev->dev,
 705                         "%s - failed to power on unit: %i\n", __func__, status);
 706                 return status;
 707         }
 708
 709         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 710         if (!serial_priv)
 711                 return -ENOMEM;
 712
 713         serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
 714         if (!serial_priv->read_buffer) {
 715                 status = -ENOMEM;
 716                 goto err_buf;
 717         }
 718
 719         usb_set_serial_data(serial, serial_priv);
 720
 721         status = qt2_setup_urbs(serial);
 722         if (status != 0)
 723                 goto attach_failed;
 724
 725         return 0;
 726
 727 attach_failed:
 728         kfree(serial_priv->read_buffer);
 729 err_buf:
 730         kfree(serial_priv);
 731         return status;
 732 }
 733
 734 static int qt2_port_probe(struct usb_serial_port *port)
 735 {
 736         struct usb_serial *serial = port->serial;
 737         struct qt2_port_private *port_priv;
 738         u8 bEndpointAddress;
 739
 740         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
 741         if (!port_priv)
 742                 return -ENOMEM;
 743
 744         spin_lock_init(&port_priv->lock);
 745         spin_lock_init(&port_priv->urb_lock);
 746         port_priv->port = port;
 747
 748         port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
 749         if (!port_priv->write_buffer)
 750                 goto err_buf;
 751
 752         port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 753         if (!port_priv->write_urb)
 754                 goto err_urb;
 755
 756         bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
 757         usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
 758                                 usb_sndbulkpipe(serial->dev, bEndpointAddress),
 759                                 port_priv->write_buffer,
 760                                 QT2_WRITE_BUFFER_SIZE,
 761                                 qt2_write_bulk_callback, port);
 762
 763         usb_set_serial_port_data(port, port_priv);
 764
 765         return 0;
 766 err_urb:
 767         kfree(port_priv->write_buffer);
 768 err_buf:
 769         kfree(port_priv);
 770         return -ENOMEM;
 771 }
 772
 773 static int qt2_port_remove(struct usb_serial_port *port)
 774 {
 775         struct qt2_port_private *port_priv;
 776
 777         port_priv = usb_get_serial_port_data(port);
 778         usb_free_urb(port_priv->write_urb);
 779         kfree(port_priv->write_buffer);
 780         kfree(port_priv);
 781
 782         return 0;
 783 }
 784
 785 static int qt2_tiocmget(struct tty_struct *tty)
 786 {
 787         struct usb_serial_port *port = tty->driver_data;
 788         struct usb_device *dev = port->serial->dev;
 789         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 790         u8 *d;
 791         int r;
 792
 793         d = kzalloc(2, GFP_KERNEL);
 794         if (!d)
 795                 return -ENOMEM;
 796
 797         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
 798         if (r < 0)
 799                 goto mget_out;
 800
 801         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
 802         if (r < 0)
 803                 goto mget_out;
 804
 805         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 806             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 807             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 808             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 809             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 810             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 811
 812 mget_out:
 813         kfree(d);
 814         return r;
 815 }
 816
 817 static int qt2_tiocmset(struct tty_struct *tty,
 818                         unsigned int set, unsigned int clear)
 819 {
 820         struct qt2_port_private *port_priv;
 821
 822         port_priv = usb_get_serial_port_data(tty->driver_data);
 823         return update_mctrl(port_priv, set, clear);
 824 }
 825
 826 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
 827 {
 828         struct usb_serial_port *port = tty->driver_data;
 829         struct qt2_port_private *port_priv;
 830         int status;
 831         u16 val;
 832
 833         port_priv = usb_get_serial_port_data(port);
 834
 835         val = (break_state == -1) ? 1 : 0;
 836
 837         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
 838                                  val, port_priv->device_port);
 839         if (status < 0)
 840                 dev_warn(&port->dev,
 841                          "%s - failed to send control message: %i\n", __func__,
 842                          status);
 843 }
 844
 845
 846
 847 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
 848 {
 849         struct usb_device *dev = port->serial->dev;
 850         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 851
 852         /* Disable flow control */
 853         if (!on) {
 854                 if (qt2_setregister(dev, port_priv->device_port,
 855                                            UART_MCR, 0) < 0)
 856                         dev_warn(&port->dev, "error from flowcontrol urb\n");
 857         }
 858         /* drop RTS and DTR */
 859         if (on)
 860                 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
 861         else
 862                 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 863 }
 864
 865 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
 866 {
 867         struct qt2_port_private *port_priv;
 868         u8 newMSR = (u8) *ch;
 869         unsigned long flags;
 870
 871         port_priv = usb_get_serial_port_data(port);
 872
 873         spin_lock_irqsave(&port_priv->lock, flags);
 874         port_priv->shadowMSR = newMSR;
 875         spin_unlock_irqrestore(&port_priv->lock, flags);
 876
 877         if (newMSR & UART_MSR_ANY_DELTA) {
 878                 /* update input line counters */
 879                 if (newMSR & UART_MSR_DCTS)
 880                         port->icount.cts++;
 881                 if (newMSR & UART_MSR_DDSR)
 882                         port->icount.dsr++;
 883                 if (newMSR & UART_MSR_DDCD)
 884                         port->icount.dcd++;
 885                 if (newMSR & UART_MSR_TERI)
 886                         port->icount.rng++;
 887
 888                 wake_up_interruptible(&port->port.delta_msr_wait);
 889         }
 890 }
 891
 892 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
 893 {
 894         struct qt2_port_private *port_priv;
 895         struct async_icount *icount;
 896         unsigned long flags;
 897         u8 newLSR = (u8) *ch;
 898
 899         port_priv = usb_get_serial_port_data(port);
 900
 901         if (newLSR & UART_LSR_BI)
 902                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
 903
 904         spin_lock_irqsave(&port_priv->lock, flags);
 905         port_priv->shadowLSR = newLSR;
 906         spin_unlock_irqrestore(&port_priv->lock, flags);
 907
 908         icount = &port->icount;
 909
 910         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
 911
 912                 if (newLSR & UART_LSR_BI)
 913                         icount->brk++;
 914
 915                 if (newLSR & UART_LSR_OE)
 916                         icount->overrun++;
 917
 918                 if (newLSR & UART_LSR_PE)
 919                         icount->parity++;
 920
 921                 if (newLSR & UART_LSR_FE)
 922                         icount->frame++;
 923         }
 924
 925 }
 926
 927 static int qt2_write_room(struct tty_struct *tty)
 928 {
 929         struct usb_serial_port *port = tty->driver_data;
 930         struct qt2_port_private *port_priv;
 931         unsigned long flags = 0;
 932         int r;
 933
 934         port_priv = usb_get_serial_port_data(port);
 935
 936         spin_lock_irqsave(&port_priv->urb_lock, flags);
 937
 938         if (port_priv->urb_in_use)
 939                 r = 0;
 940         else
 941                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
 942
 943         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 944
 945         return r;
 946 }
 947
 948 static int qt2_write(struct tty_struct *tty,
 949                      struct usb_serial_port *port,
 950                      const unsigned char *buf, int count)
 951 {
 952         struct qt2_port_private *port_priv;
 953         struct urb *write_urb;
 954         unsigned char *data;
 955         unsigned long flags;
 956         int status;
 957         int bytes_out = 0;
 958
 959         port_priv = usb_get_serial_port_data(port);
 960
 961         if (port_priv->write_urb == NULL) {
 962                 dev_err(&port->dev, "%s - no output urb\n", __func__);
 963                 return 0;
 964         }
 965         write_urb = port_priv->write_urb;
 966
 967         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
 968
 969         data = write_urb->transfer_buffer;
 970         spin_lock_irqsave(&port_priv->urb_lock, flags);
 971         if (port_priv->urb_in_use) {
 972                 dev_err(&port->dev, "qt2_write - urb is in use\n");
 973                 goto write_out;
 974         }
 975
 976         *data++ = QT2_CONTROL_BYTE;
 977         *data++ = QT2_CONTROL_BYTE;
 978         *data++ = port_priv->device_port;
 979         put_unaligned_le16(count, data);
 980         data += 2;
 981         memcpy(data, buf, count);
 982
 983         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
 984
 985         status = usb_submit_urb(write_urb, GFP_ATOMIC);
 986         if (status == 0) {
 987                 port_priv->urb_in_use = true;
 988                 bytes_out += count;
 989         }
 990
 991 write_out:
 992         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 993         return bytes_out;
 994 }
 995
 996
 997 static struct usb_serial_driver qt2_device = {
 998         .driver = {
 999                 .owner = THIS_MODULE,
1000                 .name = "quatech-serial",
1001         },
1002         .description         = DRIVER_DESC,
1003         .id_table            = id_table,
1004         .open                = qt2_open,
1005         .close               = qt2_close,
1006         .write               = qt2_write,
1007         .write_room          = qt2_write_room,
1008         .calc_num_ports      = qt2_calc_num_ports,
1009         .attach              = qt2_attach,
1010         .release             = qt2_release,
1011         .disconnect          = qt2_disconnect,
1012         .port_probe          = qt2_port_probe,
1013         .port_remove         = qt2_port_remove,
1014         .dtr_rts             = qt2_dtr_rts,
1015         .break_ctl           = qt2_break_ctl,
1016         .tiocmget            = qt2_tiocmget,
1017         .tiocmset            = qt2_tiocmset,
1018         .tiocmiwait          = usb_serial_generic_tiocmiwait,
1019         .get_icount          = usb_serial_generic_get_icount,
1020         .ioctl               = qt2_ioctl,
1021         .set_termios         = qt2_set_termios,
1022 };
1023
1024 static struct usb_serial_driver *const serial_drivers[] = {
1025         &qt2_device, NULL
1026 };
1027
1028 module_usb_serial_driver(serial_drivers, id_table);
1029
1030 MODULE_DESCRIPTION(DRIVER_DESC);
1031 MODULE_LICENSE("GPL");