drivers/usb/serial/quatech2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * usb-serial driver for Quatech USB 2 devices
   4  *
   5  * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
   6  *
   7  *  These devices all have only 1 bulk in and 1 bulk out that is shared
   8  *  for all serial ports.
   9  *
  10  */
  11
  12 #include <asm/unaligned.h>
  13 #include <linux/errno.h>
  14 #include <linux/slab.h>
  15 #include <linux/tty.h>
  16 #include <linux/tty_driver.h>
  17 #include <linux/tty_flip.h>
  18 #include <linux/module.h>
  19 #include <linux/serial.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/serial.h>
  22 #include <linux/serial_reg.h>
  23 #include <linux/uaccess.h>
  24
  25 /* default urb timeout for usb operations */
  26 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
  27
  28 #define QT_OPEN_CLOSE_CHANNEL       0xca
  29 #define QT_SET_GET_DEVICE           0xc2
  30 #define QT_SET_GET_REGISTER         0xc0
  31 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  32 #define QT_SET_ATF                  0xcd
  33 #define QT_TRANSFER_IN              0xc0
  34 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  35 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  36 #define QT2_BREAK_CONTROL           0xc8
  37 #define QT2_GET_SET_UART            0xc1
  38 #define QT2_FLUSH_DEVICE            0xc4
  39 #define QT2_GET_SET_QMCR            0xe1
  40 #define QT2_QMCR_RS232              0x40
  41 #define QT2_QMCR_RS422              0x10
  42
  43 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
  44
  45 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
  46
  47 /* status bytes for the device */
  48 #define QT2_CONTROL_BYTE    0x1b
  49 #define QT2_LINE_STATUS     0x00  /* following 1 byte is line status */
  50 #define QT2_MODEM_STATUS    0x01  /* following 1 byte is modem status */
  51 #define QT2_XMIT_HOLD       0x02  /* following 2 bytes are ?? */
  52 #define QT2_CHANGE_PORT     0x03  /* following 1 byte is port to change to */
  53 #define QT2_REC_FLUSH       0x04  /* no following info */
  54 #define QT2_XMIT_FLUSH      0x05  /* no following info */
  55 #define QT2_CONTROL_ESCAPE  0xff  /* pass through previous 2 control bytes */
  56
  57 #define  MAX_BAUD_RATE              921600
  58 #define  DEFAULT_BAUD_RATE          9600
  59
  60 #define QT2_READ_BUFFER_SIZE    512  /* size of read buffer */
  61 #define QT2_WRITE_BUFFER_SIZE   512  /* size of write buffer */
  62 #define QT2_WRITE_CONTROL_SIZE  5    /* control bytes used for a write */
  63
  64 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
  65
  66 #define USB_VENDOR_ID_QUATECH   0x061d
  67 #define QUATECH_SSU2_100        0xC120  /* RS232 single port */
  68 #define QUATECH_DSU2_100        0xC140  /* RS232 dual port */
  69 #define QUATECH_DSU2_400        0xC150  /* RS232/422/485 dual port */
  70 #define QUATECH_QSU2_100        0xC160  /* RS232 four port */
  71 #define QUATECH_QSU2_400        0xC170  /* RS232/422/485 four port */
  72 #define QUATECH_ESU2_100        0xC1A0  /* RS232 eight port */
  73 #define QUATECH_ESU2_400        0xC180  /* RS232/422/485 eight port */
  74
  75 struct qt2_device_detail {
  76         int product_id;
  77         int num_ports;
  78 };
  79
  80 #define QT_DETAILS(prod, ports) \
  81         .product_id = (prod),   \
  82         .num_ports = (ports)
  83
  84 static const struct qt2_device_detail qt2_device_details[] = {
  85         {QT_DETAILS(QUATECH_SSU2_100, 1)},
  86         {QT_DETAILS(QUATECH_DSU2_400, 2)},
  87         {QT_DETAILS(QUATECH_DSU2_100, 2)},
  88         {QT_DETAILS(QUATECH_QSU2_400, 4)},
  89         {QT_DETAILS(QUATECH_QSU2_100, 4)},
  90         {QT_DETAILS(QUATECH_ESU2_400, 8)},
  91         {QT_DETAILS(QUATECH_ESU2_100, 8)},
  92         {QT_DETAILS(0, 0)}      /* Terminating entry */
  93 };
  94
  95 static const struct usb_device_id id_table[] = {
  96         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
  97         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
  98         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
  99         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
 100         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
 101         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
 102         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
 103         {}                      /* Terminating entry */
 104 };
 105 MODULE_DEVICE_TABLE(usb, id_table);
 106
 107 struct qt2_serial_private {
 108         unsigned char current_port;  /* current port for incoming data */
 109
 110         struct urb      *read_urb;   /* shared among all ports */
 111         char            *read_buffer;
 112 };
 113
 114 struct qt2_port_private {
 115         u8   device_port;
 116
 117         spinlock_t urb_lock;
 118         bool       urb_in_use;
 119         struct urb *write_urb;
 120         char       *write_buffer;
 121
 122         spinlock_t  lock;
 123         u8          shadowLSR;
 124         u8          shadowMSR;
 125
 126         struct usb_serial_port *port;
 127 };
 128
 129 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
 130 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
 131 static void qt2_write_bulk_callback(struct urb *urb);
 132 static void qt2_read_bulk_callback(struct urb *urb);
 133
 134 static void qt2_release(struct usb_serial *serial)
 135 {
 136         struct qt2_serial_private *serial_priv;
 137
 138         serial_priv = usb_get_serial_data(serial);
 139
 140         usb_kill_urb(serial_priv->read_urb);
 141         usb_free_urb(serial_priv->read_urb);
 142         kfree(serial_priv->read_buffer);
 143         kfree(serial_priv);
 144 }
 145
 146 static inline int calc_baud_divisor(int baudrate)
 147 {
 148         int divisor, rem;
 149
 150         divisor = MAX_BAUD_RATE / baudrate;
 151         rem = MAX_BAUD_RATE % baudrate;
 152         /* Round to nearest divisor */
 153         if (((rem * 2) >= baudrate) && (baudrate != 110))
 154                 divisor++;
 155
 156         return divisor;
 157 }
 158
 159 static inline int qt2_set_port_config(struct usb_device *dev,
 160                                       unsigned char port_number,
 161                                       u16 baudrate, u16 lcr)
 162 {
 163         int divisor = calc_baud_divisor(baudrate);
 164         u16 index = ((u16) (lcr << 8) | (u16) (port_number));
 165
 166         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 167                                QT2_GET_SET_UART, 0x40,
 168                                divisor, index, NULL, 0, QT2_USB_TIMEOUT);
 169 }
 170
 171 static inline int qt2_control_msg(struct usb_device *dev,
 172                                   u8 request, u16 data, u16 index)
 173 {
 174         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 175                                request, 0x40, data, index,
 176                                NULL, 0, QT2_USB_TIMEOUT);
 177 }
 178
 179 static inline int qt2_setdevice(struct usb_device *dev, u8 *data)
 180 {
 181         u16 x = ((u16) (data[1] << 8) | (u16) (data[0]));
 182
 183         return qt2_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
 184 }
 185
 186
 187 static inline int qt2_getregister(struct usb_device *dev,
 188                                   u8 uart,
 189                                   u8 reg,
 190                                   u8 *data)
 191 {
 192         int ret;
 193
 194         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 195                               QT_SET_GET_REGISTER, 0xc0, reg,
 196                               uart, data, sizeof(*data), QT2_USB_TIMEOUT);
 197         if (ret < (int)sizeof(*data)) {
 198                 if (ret >= 0)
 199                         ret = -EIO;
 200         }
 201
 202         return ret;
 203 }
 204
 205 static inline int qt2_setregister(struct usb_device *dev,
 206                                   u8 uart, u8 reg, u16 data)
 207 {
 208         u16 value = (data << 8) | reg;
 209
 210         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 211                                QT_SET_GET_REGISTER, 0x40, value, uart,
 212                                NULL, 0, QT2_USB_TIMEOUT);
 213 }
 214
 215 static inline int update_mctrl(struct qt2_port_private *port_priv,
 216                                unsigned int set, unsigned int clear)
 217 {
 218         struct usb_serial_port *port = port_priv->port;
 219         struct usb_device *dev = port->serial->dev;
 220         unsigned urb_value;
 221         int status;
 222
 223         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 224                 dev_dbg(&port->dev,
 225                         "update_mctrl - DTR|RTS not being set|cleared\n");
 226                 return 0;       /* no change */
 227         }
 228
 229         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 230         urb_value = 0;
 231         if (set & TIOCM_DTR)
 232                 urb_value |= UART_MCR_DTR;
 233         if (set & TIOCM_RTS)
 234                 urb_value |= UART_MCR_RTS;
 235
 236         status = qt2_setregister(dev, port_priv->device_port, UART_MCR,
 237                                  urb_value);
 238         if (status < 0)
 239                 dev_err(&port->dev,
 240                         "update_mctrl - Error from MODEM_CTRL urb: %i\n",
 241                         status);
 242         return status;
 243 }
 244
 245 static int qt2_calc_num_ports(struct usb_serial *serial,
 246                                         struct usb_serial_endpoints *epds)
 247 {
 248         struct qt2_device_detail d;
 249         int i;
 250
 251         for (i = 0; d = qt2_device_details[i], d.product_id != 0; i++) {
 252                 if (d.product_id == le16_to_cpu(serial->dev->descriptor.idProduct))
 253                         return d.num_ports;
 254         }
 255
 256         /* we didn't recognize the device */
 257         dev_err(&serial->dev->dev,
 258                  "don't know the number of ports, assuming 1\n");
 259
 260         return 1;
 261 }
 262
 263 static void qt2_set_termios(struct tty_struct *tty,
 264                             struct usb_serial_port *port,
 265                             struct ktermios *old_termios)
 266 {
 267         struct usb_device *dev = port->serial->dev;
 268         struct qt2_port_private *port_priv;
 269         struct ktermios *termios = &tty->termios;
 270         u16 baud;
 271         unsigned int cflag = termios->c_cflag;
 272         u16 new_lcr = 0;
 273         int status;
 274
 275         port_priv = usb_get_serial_port_data(port);
 276
 277         if (cflag & PARENB) {
 278                 if (cflag & PARODD)
 279                         new_lcr |= UART_LCR_PARITY;
 280                 else
 281                         new_lcr |= SERIAL_EVEN_PARITY;
 282         }
 283
 284         switch (cflag & CSIZE) {
 285         case CS5:
 286                 new_lcr |= UART_LCR_WLEN5;
 287                 break;
 288         case CS6:
 289                 new_lcr |= UART_LCR_WLEN6;
 290                 break;
 291         case CS7:
 292                 new_lcr |= UART_LCR_WLEN7;
 293                 break;
 294         default:
 295         case CS8:
 296                 new_lcr |= UART_LCR_WLEN8;
 297                 break;
 298         }
 299
 300         baud = tty_get_baud_rate(tty);
 301         if (!baud)
 302                 baud = 9600;
 303
 304         status = qt2_set_port_config(dev, port_priv->device_port, baud,
 305                                      new_lcr);
 306         if (status < 0)
 307                 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
 308                         __func__, status);
 309
 310         if (cflag & CRTSCTS)
 311                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 312                                          SERIAL_CRTSCTS,
 313                                          port_priv->device_port);
 314         else
 315                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 316                                          0, port_priv->device_port);
 317         if (status < 0)
 318                 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
 319                         __func__, status);
 320
 321         if (I_IXOFF(tty) || I_IXON(tty)) {
 322                 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
 323
 324                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 325                                          x, port_priv->device_port);
 326         } else
 327                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 328                                          0, port_priv->device_port);
 329
 330         if (status < 0)
 331                 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
 332                         __func__, status);
 333
 334 }
 335
 336 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
 337 {
 338         struct usb_serial *serial;
 339         struct qt2_port_private *port_priv;
 340         u8 *data;
 341         u16 device_port;
 342         int status;
 343         unsigned long flags;
 344
 345         device_port = port->port_number;
 346
 347         serial = port->serial;
 348
 349         port_priv = usb_get_serial_port_data(port);
 350
 351         /* set the port to RS232 mode */
 352         status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
 353                                  QT2_QMCR_RS232, device_port);
 354         if (status < 0) {
 355                 dev_err(&port->dev,
 356                         "%s failed to set RS232 mode for port %i error %i\n",
 357                         __func__, device_port, status);
 358                 return status;
 359         }
 360
 361         data = kzalloc(2, GFP_KERNEL);
 362         if (!data)
 363                 return -ENOMEM;
 364
 365         /* open the port */
 366         status = usb_control_msg(serial->dev,
 367                                  usb_rcvctrlpipe(serial->dev, 0),
 368                                  QT_OPEN_CLOSE_CHANNEL,
 369                                  0xc0, 0,
 370                                  device_port, data, 2, QT2_USB_TIMEOUT);
 371
 372         if (status < 2) {
 373                 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
 374                         status);
 375                 if (status >= 0)
 376                         status = -EIO;
 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         int i;
 411
 412         serial = port->serial;
 413         port_priv = usb_get_serial_port_data(port);
 414
 415         usb_kill_urb(port_priv->write_urb);
 416
 417         /* flush the port transmit buffer */
 418         i = usb_control_msg(serial->dev,
 419                             usb_sndctrlpipe(serial->dev, 0),
 420                             QT2_FLUSH_DEVICE, 0x40, 1,
 421                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 422
 423         if (i < 0)
 424                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
 425                         __func__, i);
 426
 427         /* flush the port receive buffer */
 428         i = usb_control_msg(serial->dev,
 429                             usb_sndctrlpipe(serial->dev, 0),
 430                             QT2_FLUSH_DEVICE, 0x40, 0,
 431                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 432
 433         if (i < 0)
 434                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
 435                         __func__, i);
 436
 437         /* close the port */
 438         i = usb_control_msg(serial->dev,
 439                             usb_sndctrlpipe(serial->dev, 0),
 440                             QT_OPEN_CLOSE_CHANNEL,
 441                             0x40, 0,
 442                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 443
 444         if (i < 0)
 445                 dev_err(&port->dev, "%s - close port failed %i\n",
 446                         __func__, i);
 447 }
 448
 449 static void qt2_disconnect(struct usb_serial *serial)
 450 {
 451         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
 452
 453         usb_kill_urb(serial_priv->read_urb);
 454 }
 455
 456 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
 457 {
 458         switch (*ch) {
 459         case QT2_LINE_STATUS:
 460                 qt2_update_lsr(port, ch + 1);
 461                 break;
 462         case QT2_MODEM_STATUS:
 463                 qt2_update_msr(port, ch + 1);
 464                 break;
 465         }
 466 }
 467
 468 static void qt2_process_read_urb(struct urb *urb)
 469 {
 470         struct usb_serial *serial;
 471         struct qt2_serial_private *serial_priv;
 472         struct usb_serial_port *port;
 473         bool escapeflag;
 474         unsigned char *ch;
 475         int i;
 476         unsigned char newport;
 477         int len = urb->actual_length;
 478
 479         if (!len)
 480                 return;
 481
 482         ch = urb->transfer_buffer;
 483         serial = urb->context;
 484         serial_priv = usb_get_serial_data(serial);
 485         port = serial->port[serial_priv->current_port];
 486
 487         for (i = 0; i < urb->actual_length; i++) {
 488                 ch = (unsigned char *)urb->transfer_buffer + i;
 489                 if ((i <= (len - 3)) &&
 490                     (*ch == QT2_CONTROL_BYTE) &&
 491                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
 492                         escapeflag = false;
 493                         switch (*(ch + 2)) {
 494                         case QT2_LINE_STATUS:
 495                         case QT2_MODEM_STATUS:
 496                                 if (i > (len - 4)) {
 497                                         dev_warn(&port->dev,
 498                                                  "%s - status message too short\n",
 499                                                 __func__);
 500                                         break;
 501                                 }
 502                                 qt2_process_status(port, ch + 2);
 503                                 i += 3;
 504                                 escapeflag = true;
 505                                 break;
 506                         case QT2_XMIT_HOLD:
 507                                 if (i > (len - 5)) {
 508                                         dev_warn(&port->dev,
 509                                                  "%s - xmit_empty message too short\n",
 510                                                  __func__);
 511                                         break;
 512                                 }
 513                                 /* bytes_written = (ch[1] << 4) + ch[0]; */
 514                                 i += 4;
 515                                 escapeflag = true;
 516                                 break;
 517                         case QT2_CHANGE_PORT:
 518                                 if (i > (len - 4)) {
 519                                         dev_warn(&port->dev,
 520                                                  "%s - change_port message too short\n",
 521                                                  __func__);
 522                                         break;
 523                                 }
 524                                 tty_flip_buffer_push(&port->port);
 525
 526                                 newport = *(ch + 3);
 527
 528                                 if (newport > serial->num_ports) {
 529                                         dev_err(&port->dev,
 530                                                 "%s - port change to invalid port: %i\n",
 531                                                 __func__, newport);
 532                                         break;
 533                                 }
 534
 535                                 serial_priv->current_port = newport;
 536                                 port = serial->port[serial_priv->current_port];
 537                                 i += 3;
 538                                 escapeflag = true;
 539                                 break;
 540                         case QT2_REC_FLUSH:
 541                         case QT2_XMIT_FLUSH:
 542                                 i += 2;
 543                                 escapeflag = true;
 544                                 break;
 545                         case QT2_CONTROL_ESCAPE:
 546                                 tty_insert_flip_string(&port->port, ch, 2);
 547                                 i += 2;
 548                                 escapeflag = true;
 549                                 break;
 550                         default:
 551                                 dev_warn(&port->dev,
 552                                          "%s - unsupported command %i\n",
 553                                          __func__, *(ch + 2));
 554                                 break;
 555                         }
 556                         if (escapeflag)
 557                                 continue;
 558                 }
 559
 560                 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
 561         }
 562
 563         tty_flip_buffer_push(&port->port);
 564 }
 565
 566 static void qt2_write_bulk_callback(struct urb *urb)
 567 {
 568         struct usb_serial_port *port;
 569         struct qt2_port_private *port_priv;
 570         unsigned long flags;
 571
 572         port = urb->context;
 573         port_priv = usb_get_serial_port_data(port);
 574
 575         spin_lock_irqsave(&port_priv->urb_lock, flags);
 576
 577         port_priv->urb_in_use = false;
 578         usb_serial_port_softint(port);
 579
 580         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 581
 582 }
 583
 584 static void qt2_read_bulk_callback(struct urb *urb)
 585 {
 586         struct usb_serial *serial = urb->context;
 587         int status;
 588
 589         if (urb->status) {
 590                 dev_warn(&serial->dev->dev,
 591                          "%s - non-zero urb status: %i\n", __func__,
 592                          urb->status);
 593                 return;
 594         }
 595
 596         qt2_process_read_urb(urb);
 597
 598         status = usb_submit_urb(urb, GFP_ATOMIC);
 599         if (status != 0)
 600                 dev_err(&serial->dev->dev,
 601                         "%s - resubmit read urb failed: %i\n",
 602                         __func__, status);
 603 }
 604
 605 static int qt2_setup_urbs(struct usb_serial *serial)
 606 {
 607         struct usb_serial_port *port0;
 608         struct qt2_serial_private *serial_priv;
 609         int status;
 610
 611         port0 = serial->port[0];
 612
 613         serial_priv = usb_get_serial_data(serial);
 614         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 615         if (!serial_priv->read_urb)
 616                 return -ENOMEM;
 617
 618         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
 619                           usb_rcvbulkpipe(serial->dev,
 620                                           port0->bulk_in_endpointAddress),
 621                           serial_priv->read_buffer,
 622                           QT2_READ_BUFFER_SIZE,
 623                           qt2_read_bulk_callback, serial);
 624
 625         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
 626         if (status != 0) {
 627                 dev_err(&serial->dev->dev,
 628                         "%s - submit read urb failed %i\n", __func__, status);
 629                 usb_free_urb(serial_priv->read_urb);
 630                 return status;
 631         }
 632
 633         return 0;
 634 }
 635
 636 static int qt2_attach(struct usb_serial *serial)
 637 {
 638         struct qt2_serial_private *serial_priv;
 639         int status;
 640
 641         /* power on unit */
 642         status = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 643                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
 644                                  QT2_USB_TIMEOUT);
 645         if (status < 0) {
 646                 dev_err(&serial->dev->dev,
 647                         "%s - failed to power on unit: %i\n", __func__, status);
 648                 return status;
 649         }
 650
 651         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 652         if (!serial_priv)
 653                 return -ENOMEM;
 654
 655         serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
 656         if (!serial_priv->read_buffer) {
 657                 status = -ENOMEM;
 658                 goto err_buf;
 659         }
 660
 661         usb_set_serial_data(serial, serial_priv);
 662
 663         status = qt2_setup_urbs(serial);
 664         if (status != 0)
 665                 goto attach_failed;
 666
 667         return 0;
 668
 669 attach_failed:
 670         kfree(serial_priv->read_buffer);
 671 err_buf:
 672         kfree(serial_priv);
 673         return status;
 674 }
 675
 676 static int qt2_port_probe(struct usb_serial_port *port)
 677 {
 678         struct usb_serial *serial = port->serial;
 679         struct qt2_port_private *port_priv;
 680         u8 bEndpointAddress;
 681
 682         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
 683         if (!port_priv)
 684                 return -ENOMEM;
 685
 686         spin_lock_init(&port_priv->lock);
 687         spin_lock_init(&port_priv->urb_lock);
 688         port_priv->port = port;
 689
 690         port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
 691         if (!port_priv->write_buffer)
 692                 goto err_buf;
 693
 694         port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 695         if (!port_priv->write_urb)
 696                 goto err_urb;
 697
 698         bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
 699         usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
 700                                 usb_sndbulkpipe(serial->dev, bEndpointAddress),
 701                                 port_priv->write_buffer,
 702                                 QT2_WRITE_BUFFER_SIZE,
 703                                 qt2_write_bulk_callback, port);
 704
 705         usb_set_serial_port_data(port, port_priv);
 706
 707         return 0;
 708 err_urb:
 709         kfree(port_priv->write_buffer);
 710 err_buf:
 711         kfree(port_priv);
 712         return -ENOMEM;
 713 }
 714
 715 static void qt2_port_remove(struct usb_serial_port *port)
 716 {
 717         struct qt2_port_private *port_priv;
 718
 719         port_priv = usb_get_serial_port_data(port);
 720         usb_free_urb(port_priv->write_urb);
 721         kfree(port_priv->write_buffer);
 722         kfree(port_priv);
 723 }
 724
 725 static int qt2_tiocmget(struct tty_struct *tty)
 726 {
 727         struct usb_serial_port *port = tty->driver_data;
 728         struct usb_device *dev = port->serial->dev;
 729         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 730         u8 *d;
 731         int r;
 732
 733         d = kzalloc(2, GFP_KERNEL);
 734         if (!d)
 735                 return -ENOMEM;
 736
 737         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
 738         if (r < 0)
 739                 goto mget_out;
 740
 741         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
 742         if (r < 0)
 743                 goto mget_out;
 744
 745         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 746             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 747             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 748             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 749             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 750             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 751
 752 mget_out:
 753         kfree(d);
 754         return r;
 755 }
 756
 757 static int qt2_tiocmset(struct tty_struct *tty,
 758                         unsigned int set, unsigned int clear)
 759 {
 760         struct qt2_port_private *port_priv;
 761
 762         port_priv = usb_get_serial_port_data(tty->driver_data);
 763         return update_mctrl(port_priv, set, clear);
 764 }
 765
 766 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
 767 {
 768         struct usb_serial_port *port = tty->driver_data;
 769         struct qt2_port_private *port_priv;
 770         int status;
 771         u16 val;
 772
 773         port_priv = usb_get_serial_port_data(port);
 774
 775         val = (break_state == -1) ? 1 : 0;
 776
 777         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
 778                                  val, port_priv->device_port);
 779         if (status < 0)
 780                 dev_warn(&port->dev,
 781                          "%s - failed to send control message: %i\n", __func__,
 782                          status);
 783 }
 784
 785
 786
 787 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
 788 {
 789         struct usb_device *dev = port->serial->dev;
 790         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 791
 792         /* Disable flow control */
 793         if (!on) {
 794                 if (qt2_setregister(dev, port_priv->device_port,
 795                                            UART_MCR, 0) < 0)
 796                         dev_warn(&port->dev, "error from flowcontrol urb\n");
 797         }
 798         /* drop RTS and DTR */
 799         if (on)
 800                 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
 801         else
 802                 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 803 }
 804
 805 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
 806 {
 807         struct qt2_port_private *port_priv;
 808         u8 newMSR = (u8) *ch;
 809         unsigned long flags;
 810
 811         /* May be called from qt2_process_read_urb() for an unbound port. */
 812         port_priv = usb_get_serial_port_data(port);
 813         if (!port_priv)
 814                 return;
 815
 816         spin_lock_irqsave(&port_priv->lock, flags);
 817         port_priv->shadowMSR = newMSR;
 818         spin_unlock_irqrestore(&port_priv->lock, flags);
 819
 820         if (newMSR & UART_MSR_ANY_DELTA) {
 821                 /* update input line counters */
 822                 if (newMSR & UART_MSR_DCTS)
 823                         port->icount.cts++;
 824                 if (newMSR & UART_MSR_DDSR)
 825                         port->icount.dsr++;
 826                 if (newMSR & UART_MSR_DDCD)
 827                         port->icount.dcd++;
 828                 if (newMSR & UART_MSR_TERI)
 829                         port->icount.rng++;
 830
 831                 wake_up_interruptible(&port->port.delta_msr_wait);
 832         }
 833 }
 834
 835 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
 836 {
 837         struct qt2_port_private *port_priv;
 838         struct async_icount *icount;
 839         unsigned long flags;
 840         u8 newLSR = (u8) *ch;
 841
 842         /* May be called from qt2_process_read_urb() for an unbound port. */
 843         port_priv = usb_get_serial_port_data(port);
 844         if (!port_priv)
 845                 return;
 846
 847         if (newLSR & UART_LSR_BI)
 848                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
 849
 850         spin_lock_irqsave(&port_priv->lock, flags);
 851         port_priv->shadowLSR = newLSR;
 852         spin_unlock_irqrestore(&port_priv->lock, flags);
 853
 854         icount = &port->icount;
 855
 856         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
 857
 858                 if (newLSR & UART_LSR_BI)
 859                         icount->brk++;
 860
 861                 if (newLSR & UART_LSR_OE)
 862                         icount->overrun++;
 863
 864                 if (newLSR & UART_LSR_PE)
 865                         icount->parity++;
 866
 867                 if (newLSR & UART_LSR_FE)
 868                         icount->frame++;
 869         }
 870
 871 }
 872
 873 static int qt2_write_room(struct tty_struct *tty)
 874 {
 875         struct usb_serial_port *port = tty->driver_data;
 876         struct qt2_port_private *port_priv;
 877         unsigned long flags = 0;
 878         int r;
 879
 880         port_priv = usb_get_serial_port_data(port);
 881
 882         spin_lock_irqsave(&port_priv->urb_lock, flags);
 883
 884         if (port_priv->urb_in_use)
 885                 r = 0;
 886         else
 887                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
 888
 889         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 890
 891         return r;
 892 }
 893
 894 static int qt2_write(struct tty_struct *tty,
 895                      struct usb_serial_port *port,
 896                      const unsigned char *buf, int count)
 897 {
 898         struct qt2_port_private *port_priv;
 899         struct urb *write_urb;
 900         unsigned char *data;
 901         unsigned long flags;
 902         int status;
 903         int bytes_out = 0;
 904
 905         port_priv = usb_get_serial_port_data(port);
 906
 907         if (port_priv->write_urb == NULL) {
 908                 dev_err(&port->dev, "%s - no output urb\n", __func__);
 909                 return 0;
 910         }
 911         write_urb = port_priv->write_urb;
 912
 913         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
 914
 915         data = write_urb->transfer_buffer;
 916         spin_lock_irqsave(&port_priv->urb_lock, flags);
 917         if (port_priv->urb_in_use) {
 918                 dev_err(&port->dev, "qt2_write - urb is in use\n");
 919                 goto write_out;
 920         }
 921
 922         *data++ = QT2_CONTROL_BYTE;
 923         *data++ = QT2_CONTROL_BYTE;
 924         *data++ = port_priv->device_port;
 925         put_unaligned_le16(count, data);
 926         data += 2;
 927         memcpy(data, buf, count);
 928
 929         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
 930
 931         status = usb_submit_urb(write_urb, GFP_ATOMIC);
 932         if (status == 0) {
 933                 port_priv->urb_in_use = true;
 934                 bytes_out += count;
 935         }
 936
 937 write_out:
 938         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 939         return bytes_out;
 940 }
 941
 942
 943 static struct usb_serial_driver qt2_device = {
 944         .driver = {
 945                 .owner = THIS_MODULE,
 946                 .name = "quatech-serial",
 947         },
 948         .description         = DRIVER_DESC,
 949         .id_table            = id_table,
 950         .open                = qt2_open,
 951         .close               = qt2_close,
 952         .write               = qt2_write,
 953         .write_room          = qt2_write_room,
 954         .calc_num_ports      = qt2_calc_num_ports,
 955         .attach              = qt2_attach,
 956         .release             = qt2_release,
 957         .disconnect          = qt2_disconnect,
 958         .port_probe          = qt2_port_probe,
 959         .port_remove         = qt2_port_remove,
 960         .dtr_rts             = qt2_dtr_rts,
 961         .break_ctl           = qt2_break_ctl,
 962         .tiocmget            = qt2_tiocmget,
 963         .tiocmset            = qt2_tiocmset,
 964         .tiocmiwait          = usb_serial_generic_tiocmiwait,
 965         .get_icount          = usb_serial_generic_get_icount,
 966         .set_termios         = qt2_set_termios,
 967 };
 968
 969 static struct usb_serial_driver *const serial_drivers[] = {
 970         &qt2_device, NULL
 971 };
 972
 973 module_usb_serial_driver(serial_drivers, id_table);
 974
 975 MODULE_DESCRIPTION(DRIVER_DESC);
 976 MODULE_LICENSE("GPL v2");