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 ([email protected])
   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                             const 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         new_lcr |= UART_LCR_WLEN(tty_get_char_size(cflag));
 285
 286         baud = tty_get_baud_rate(tty);
 287         if (!baud)
 288                 baud = 9600;
 289
 290         status = qt2_set_port_config(dev, port_priv->device_port, baud,
 291                                      new_lcr);
 292         if (status < 0)
 293                 dev_err(&port->dev, "%s - qt2_set_port_config failed: %i\n",
 294                         __func__, status);
 295
 296         if (cflag & CRTSCTS)
 297                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 298                                          SERIAL_CRTSCTS,
 299                                          port_priv->device_port);
 300         else
 301                 status = qt2_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 302                                          0, port_priv->device_port);
 303         if (status < 0)
 304                 dev_err(&port->dev, "%s - set HW flow control failed: %i\n",
 305                         __func__, status);
 306
 307         if (I_IXOFF(tty) || I_IXON(tty)) {
 308                 u16 x = ((u16) (START_CHAR(tty) << 8) | (u16) (STOP_CHAR(tty)));
 309
 310                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 311                                          x, port_priv->device_port);
 312         } else
 313                 status = qt2_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 314                                          0, port_priv->device_port);
 315
 316         if (status < 0)
 317                 dev_err(&port->dev, "%s - set SW flow control failed: %i\n",
 318                         __func__, status);
 319
 320 }
 321
 322 static int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
 323 {
 324         struct usb_serial *serial;
 325         struct qt2_port_private *port_priv;
 326         u8 *data;
 327         u16 device_port;
 328         int status;
 329         unsigned long flags;
 330
 331         device_port = port->port_number;
 332
 333         serial = port->serial;
 334
 335         port_priv = usb_get_serial_port_data(port);
 336
 337         /* set the port to RS232 mode */
 338         status = qt2_control_msg(serial->dev, QT2_GET_SET_QMCR,
 339                                  QT2_QMCR_RS232, device_port);
 340         if (status < 0) {
 341                 dev_err(&port->dev,
 342                         "%s failed to set RS232 mode for port %i error %i\n",
 343                         __func__, device_port, status);
 344                 return status;
 345         }
 346
 347         data = kzalloc(2, GFP_KERNEL);
 348         if (!data)
 349                 return -ENOMEM;
 350
 351         /* open the port */
 352         status = usb_control_msg(serial->dev,
 353                                  usb_rcvctrlpipe(serial->dev, 0),
 354                                  QT_OPEN_CLOSE_CHANNEL,
 355                                  0xc0, 0,
 356                                  device_port, data, 2, QT2_USB_TIMEOUT);
 357
 358         if (status < 2) {
 359                 dev_err(&port->dev, "%s - open port failed %i\n", __func__,
 360                         status);
 361                 if (status >= 0)
 362                         status = -EIO;
 363                 kfree(data);
 364                 return status;
 365         }
 366
 367         spin_lock_irqsave(&port_priv->lock, flags);
 368         port_priv->shadowLSR = data[0];
 369         port_priv->shadowMSR = data[1];
 370         spin_unlock_irqrestore(&port_priv->lock, flags);
 371
 372         kfree(data);
 373
 374         /* set to default speed and 8bit word size */
 375         status = qt2_set_port_config(serial->dev, device_port,
 376                                      DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
 377         if (status < 0) {
 378                 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
 379                         __func__, device_port);
 380                 return status;
 381         }
 382
 383         port_priv->device_port = (u8) device_port;
 384
 385         if (tty)
 386                 qt2_set_termios(tty, port, &tty->termios);
 387
 388         return 0;
 389
 390 }
 391
 392 static void qt2_close(struct usb_serial_port *port)
 393 {
 394         struct usb_serial *serial;
 395         struct qt2_port_private *port_priv;
 396         int i;
 397
 398         serial = port->serial;
 399         port_priv = usb_get_serial_port_data(port);
 400
 401         usb_kill_urb(port_priv->write_urb);
 402
 403         /* flush the port transmit buffer */
 404         i = usb_control_msg(serial->dev,
 405                             usb_sndctrlpipe(serial->dev, 0),
 406                             QT2_FLUSH_DEVICE, 0x40, 1,
 407                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 408
 409         if (i < 0)
 410                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
 411                         __func__, i);
 412
 413         /* flush the port receive buffer */
 414         i = usb_control_msg(serial->dev,
 415                             usb_sndctrlpipe(serial->dev, 0),
 416                             QT2_FLUSH_DEVICE, 0x40, 0,
 417                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 418
 419         if (i < 0)
 420                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
 421                         __func__, i);
 422
 423         /* close the port */
 424         i = usb_control_msg(serial->dev,
 425                             usb_sndctrlpipe(serial->dev, 0),
 426                             QT_OPEN_CLOSE_CHANNEL,
 427                             0x40, 0,
 428                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 429
 430         if (i < 0)
 431                 dev_err(&port->dev, "%s - close port failed %i\n",
 432                         __func__, i);
 433 }
 434
 435 static void qt2_disconnect(struct usb_serial *serial)
 436 {
 437         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
 438
 439         usb_kill_urb(serial_priv->read_urb);
 440 }
 441
 442 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
 443 {
 444         switch (*ch) {
 445         case QT2_LINE_STATUS:
 446                 qt2_update_lsr(port, ch + 1);
 447                 break;
 448         case QT2_MODEM_STATUS:
 449                 qt2_update_msr(port, ch + 1);
 450                 break;
 451         }
 452 }
 453
 454 static void qt2_process_read_urb(struct urb *urb)
 455 {
 456         struct usb_serial *serial;
 457         struct qt2_serial_private *serial_priv;
 458         struct usb_serial_port *port;
 459         bool escapeflag;
 460         unsigned char *ch;
 461         int i;
 462         unsigned char newport;
 463         int len = urb->actual_length;
 464
 465         if (!len)
 466                 return;
 467
 468         ch = urb->transfer_buffer;
 469         serial = urb->context;
 470         serial_priv = usb_get_serial_data(serial);
 471         port = serial->port[serial_priv->current_port];
 472
 473         for (i = 0; i < urb->actual_length; i++) {
 474                 ch = (unsigned char *)urb->transfer_buffer + i;
 475                 if ((i <= (len - 3)) &&
 476                     (*ch == QT2_CONTROL_BYTE) &&
 477                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
 478                         escapeflag = false;
 479                         switch (*(ch + 2)) {
 480                         case QT2_LINE_STATUS:
 481                         case QT2_MODEM_STATUS:
 482                                 if (i > (len - 4)) {
 483                                         dev_warn(&port->dev,
 484                                                  "%s - status message too short\n",
 485                                                 __func__);
 486                                         break;
 487                                 }
 488                                 qt2_process_status(port, ch + 2);
 489                                 i += 3;
 490                                 escapeflag = true;
 491                                 break;
 492                         case QT2_XMIT_HOLD:
 493                                 if (i > (len - 5)) {
 494                                         dev_warn(&port->dev,
 495                                                  "%s - xmit_empty message too short\n",
 496                                                  __func__);
 497                                         break;
 498                                 }
 499                                 /* bytes_written = (ch[1] << 4) + ch[0]; */
 500                                 i += 4;
 501                                 escapeflag = true;
 502                                 break;
 503                         case QT2_CHANGE_PORT:
 504                                 if (i > (len - 4)) {
 505                                         dev_warn(&port->dev,
 506                                                  "%s - change_port message too short\n",
 507                                                  __func__);
 508                                         break;
 509                                 }
 510                                 tty_flip_buffer_push(&port->port);
 511
 512                                 newport = *(ch + 3);
 513
 514                                 if (newport > serial->num_ports) {
 515                                         dev_err(&port->dev,
 516                                                 "%s - port change to invalid port: %i\n",
 517                                                 __func__, newport);
 518                                         break;
 519                                 }
 520
 521                                 serial_priv->current_port = newport;
 522                                 port = serial->port[serial_priv->current_port];
 523                                 i += 3;
 524                                 escapeflag = true;
 525                                 break;
 526                         case QT2_REC_FLUSH:
 527                         case QT2_XMIT_FLUSH:
 528                                 i += 2;
 529                                 escapeflag = true;
 530                                 break;
 531                         case QT2_CONTROL_ESCAPE:
 532                                 tty_insert_flip_string(&port->port, ch, 2);
 533                                 i += 2;
 534                                 escapeflag = true;
 535                                 break;
 536                         default:
 537                                 dev_warn(&port->dev,
 538                                          "%s - unsupported command %i\n",
 539                                          __func__, *(ch + 2));
 540                                 break;
 541                         }
 542                         if (escapeflag)
 543                                 continue;
 544                 }
 545
 546                 tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
 547         }
 548
 549         tty_flip_buffer_push(&port->port);
 550 }
 551
 552 static void qt2_write_bulk_callback(struct urb *urb)
 553 {
 554         struct usb_serial_port *port;
 555         struct qt2_port_private *port_priv;
 556         unsigned long flags;
 557
 558         port = urb->context;
 559         port_priv = usb_get_serial_port_data(port);
 560
 561         spin_lock_irqsave(&port_priv->urb_lock, flags);
 562
 563         port_priv->urb_in_use = false;
 564         usb_serial_port_softint(port);
 565
 566         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 567
 568 }
 569
 570 static void qt2_read_bulk_callback(struct urb *urb)
 571 {
 572         struct usb_serial *serial = urb->context;
 573         int status;
 574
 575         if (urb->status) {
 576                 dev_warn(&serial->dev->dev,
 577                          "%s - non-zero urb status: %i\n", __func__,
 578                          urb->status);
 579                 return;
 580         }
 581
 582         qt2_process_read_urb(urb);
 583
 584         status = usb_submit_urb(urb, GFP_ATOMIC);
 585         if (status != 0)
 586                 dev_err(&serial->dev->dev,
 587                         "%s - resubmit read urb failed: %i\n",
 588                         __func__, status);
 589 }
 590
 591 static int qt2_setup_urbs(struct usb_serial *serial)
 592 {
 593         struct usb_serial_port *port0;
 594         struct qt2_serial_private *serial_priv;
 595         int status;
 596
 597         port0 = serial->port[0];
 598
 599         serial_priv = usb_get_serial_data(serial);
 600         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 601         if (!serial_priv->read_urb)
 602                 return -ENOMEM;
 603
 604         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
 605                           usb_rcvbulkpipe(serial->dev,
 606                                           port0->bulk_in_endpointAddress),
 607                           serial_priv->read_buffer,
 608                           QT2_READ_BUFFER_SIZE,
 609                           qt2_read_bulk_callback, serial);
 610
 611         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
 612         if (status != 0) {
 613                 dev_err(&serial->dev->dev,
 614                         "%s - submit read urb failed %i\n", __func__, status);
 615                 usb_free_urb(serial_priv->read_urb);
 616                 return status;
 617         }
 618
 619         return 0;
 620 }
 621
 622 static int qt2_attach(struct usb_serial *serial)
 623 {
 624         struct qt2_serial_private *serial_priv;
 625         int status;
 626
 627         /* power on unit */
 628         status = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
 629                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
 630                                  QT2_USB_TIMEOUT);
 631         if (status < 0) {
 632                 dev_err(&serial->dev->dev,
 633                         "%s - failed to power on unit: %i\n", __func__, status);
 634                 return status;
 635         }
 636
 637         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 638         if (!serial_priv)
 639                 return -ENOMEM;
 640
 641         serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
 642         if (!serial_priv->read_buffer) {
 643                 status = -ENOMEM;
 644                 goto err_buf;
 645         }
 646
 647         usb_set_serial_data(serial, serial_priv);
 648
 649         status = qt2_setup_urbs(serial);
 650         if (status != 0)
 651                 goto attach_failed;
 652
 653         return 0;
 654
 655 attach_failed:
 656         kfree(serial_priv->read_buffer);
 657 err_buf:
 658         kfree(serial_priv);
 659         return status;
 660 }
 661
 662 static int qt2_port_probe(struct usb_serial_port *port)
 663 {
 664         struct usb_serial *serial = port->serial;
 665         struct qt2_port_private *port_priv;
 666         u8 bEndpointAddress;
 667
 668         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
 669         if (!port_priv)
 670                 return -ENOMEM;
 671
 672         spin_lock_init(&port_priv->lock);
 673         spin_lock_init(&port_priv->urb_lock);
 674         port_priv->port = port;
 675
 676         port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
 677         if (!port_priv->write_buffer)
 678                 goto err_buf;
 679
 680         port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 681         if (!port_priv->write_urb)
 682                 goto err_urb;
 683
 684         bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
 685         usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
 686                                 usb_sndbulkpipe(serial->dev, bEndpointAddress),
 687                                 port_priv->write_buffer,
 688                                 QT2_WRITE_BUFFER_SIZE,
 689                                 qt2_write_bulk_callback, port);
 690
 691         usb_set_serial_port_data(port, port_priv);
 692
 693         return 0;
 694 err_urb:
 695         kfree(port_priv->write_buffer);
 696 err_buf:
 697         kfree(port_priv);
 698         return -ENOMEM;
 699 }
 700
 701 static void qt2_port_remove(struct usb_serial_port *port)
 702 {
 703         struct qt2_port_private *port_priv;
 704
 705         port_priv = usb_get_serial_port_data(port);
 706         usb_free_urb(port_priv->write_urb);
 707         kfree(port_priv->write_buffer);
 708         kfree(port_priv);
 709 }
 710
 711 static int qt2_tiocmget(struct tty_struct *tty)
 712 {
 713         struct usb_serial_port *port = tty->driver_data;
 714         struct usb_device *dev = port->serial->dev;
 715         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 716         u8 *d;
 717         int r;
 718
 719         d = kzalloc(2, GFP_KERNEL);
 720         if (!d)
 721                 return -ENOMEM;
 722
 723         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
 724         if (r < 0)
 725                 goto mget_out;
 726
 727         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
 728         if (r < 0)
 729                 goto mget_out;
 730
 731         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 732             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 733             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 734             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 735             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 736             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 737
 738 mget_out:
 739         kfree(d);
 740         return r;
 741 }
 742
 743 static int qt2_tiocmset(struct tty_struct *tty,
 744                         unsigned int set, unsigned int clear)
 745 {
 746         struct qt2_port_private *port_priv;
 747
 748         port_priv = usb_get_serial_port_data(tty->driver_data);
 749         return update_mctrl(port_priv, set, clear);
 750 }
 751
 752 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
 753 {
 754         struct usb_serial_port *port = tty->driver_data;
 755         struct qt2_port_private *port_priv;
 756         int status;
 757         u16 val;
 758
 759         port_priv = usb_get_serial_port_data(port);
 760
 761         val = (break_state == -1) ? 1 : 0;
 762
 763         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
 764                                  val, port_priv->device_port);
 765         if (status < 0)
 766                 dev_warn(&port->dev,
 767                          "%s - failed to send control message: %i\n", __func__,
 768                          status);
 769 }
 770
 771
 772
 773 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
 774 {
 775         struct usb_device *dev = port->serial->dev;
 776         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 777
 778         /* Disable flow control */
 779         if (!on) {
 780                 if (qt2_setregister(dev, port_priv->device_port,
 781                                            UART_MCR, 0) < 0)
 782                         dev_warn(&port->dev, "error from flowcontrol urb\n");
 783         }
 784         /* drop RTS and DTR */
 785         if (on)
 786                 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
 787         else
 788                 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 789 }
 790
 791 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
 792 {
 793         struct qt2_port_private *port_priv;
 794         u8 newMSR = (u8) *ch;
 795         unsigned long flags;
 796
 797         /* May be called from qt2_process_read_urb() for an unbound port. */
 798         port_priv = usb_get_serial_port_data(port);
 799         if (!port_priv)
 800                 return;
 801
 802         spin_lock_irqsave(&port_priv->lock, flags);
 803         port_priv->shadowMSR = newMSR;
 804         spin_unlock_irqrestore(&port_priv->lock, flags);
 805
 806         if (newMSR & UART_MSR_ANY_DELTA) {
 807                 /* update input line counters */
 808                 if (newMSR & UART_MSR_DCTS)
 809                         port->icount.cts++;
 810                 if (newMSR & UART_MSR_DDSR)
 811                         port->icount.dsr++;
 812                 if (newMSR & UART_MSR_DDCD)
 813                         port->icount.dcd++;
 814                 if (newMSR & UART_MSR_TERI)
 815                         port->icount.rng++;
 816
 817                 wake_up_interruptible(&port->port.delta_msr_wait);
 818         }
 819 }
 820
 821 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
 822 {
 823         struct qt2_port_private *port_priv;
 824         struct async_icount *icount;
 825         unsigned long flags;
 826         u8 newLSR = (u8) *ch;
 827
 828         /* May be called from qt2_process_read_urb() for an unbound port. */
 829         port_priv = usb_get_serial_port_data(port);
 830         if (!port_priv)
 831                 return;
 832
 833         if (newLSR & UART_LSR_BI)
 834                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
 835
 836         spin_lock_irqsave(&port_priv->lock, flags);
 837         port_priv->shadowLSR = newLSR;
 838         spin_unlock_irqrestore(&port_priv->lock, flags);
 839
 840         icount = &port->icount;
 841
 842         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
 843
 844                 if (newLSR & UART_LSR_BI)
 845                         icount->brk++;
 846
 847                 if (newLSR & UART_LSR_OE)
 848                         icount->overrun++;
 849
 850                 if (newLSR & UART_LSR_PE)
 851                         icount->parity++;
 852
 853                 if (newLSR & UART_LSR_FE)
 854                         icount->frame++;
 855         }
 856
 857 }
 858
 859 static unsigned int qt2_write_room(struct tty_struct *tty)
 860 {
 861         struct usb_serial_port *port = tty->driver_data;
 862         struct qt2_port_private *port_priv;
 863         unsigned long flags;
 864         unsigned int r;
 865
 866         port_priv = usb_get_serial_port_data(port);
 867
 868         spin_lock_irqsave(&port_priv->urb_lock, flags);
 869
 870         if (port_priv->urb_in_use)
 871                 r = 0;
 872         else
 873                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
 874
 875         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 876
 877         return r;
 878 }
 879
 880 static int qt2_write(struct tty_struct *tty,
 881                      struct usb_serial_port *port,
 882                      const unsigned char *buf, int count)
 883 {
 884         struct qt2_port_private *port_priv;
 885         struct urb *write_urb;
 886         unsigned char *data;
 887         unsigned long flags;
 888         int status;
 889         int bytes_out = 0;
 890
 891         port_priv = usb_get_serial_port_data(port);
 892
 893         if (port_priv->write_urb == NULL) {
 894                 dev_err(&port->dev, "%s - no output urb\n", __func__);
 895                 return 0;
 896         }
 897         write_urb = port_priv->write_urb;
 898
 899         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
 900
 901         data = write_urb->transfer_buffer;
 902         spin_lock_irqsave(&port_priv->urb_lock, flags);
 903         if (port_priv->urb_in_use) {
 904                 dev_err(&port->dev, "qt2_write - urb is in use\n");
 905                 goto write_out;
 906         }
 907
 908         *data++ = QT2_CONTROL_BYTE;
 909         *data++ = QT2_CONTROL_BYTE;
 910         *data++ = port_priv->device_port;
 911         put_unaligned_le16(count, data);
 912         data += 2;
 913         memcpy(data, buf, count);
 914
 915         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
 916
 917         status = usb_submit_urb(write_urb, GFP_ATOMIC);
 918         if (status == 0) {
 919                 port_priv->urb_in_use = true;
 920                 bytes_out += count;
 921         }
 922
 923 write_out:
 924         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 925         return bytes_out;
 926 }
 927
 928
 929 static struct usb_serial_driver qt2_device = {
 930         .driver = {
 931                 .owner = THIS_MODULE,
 932                 .name = "quatech-serial",
 933         },
 934         .description         = DRIVER_DESC,
 935         .id_table            = id_table,
 936         .open                = qt2_open,
 937         .close               = qt2_close,
 938         .write               = qt2_write,
 939         .write_room          = qt2_write_room,
 940         .calc_num_ports      = qt2_calc_num_ports,
 941         .attach              = qt2_attach,
 942         .release             = qt2_release,
 943         .disconnect          = qt2_disconnect,
 944         .port_probe          = qt2_port_probe,
 945         .port_remove         = qt2_port_remove,
 946         .dtr_rts             = qt2_dtr_rts,
 947         .break_ctl           = qt2_break_ctl,
 948         .tiocmget            = qt2_tiocmget,
 949         .tiocmset            = qt2_tiocmset,
 950         .tiocmiwait          = usb_serial_generic_tiocmiwait,
 951         .get_icount          = usb_serial_generic_get_icount,
 952         .set_termios         = qt2_set_termios,
 953 };
 954
 955 static struct usb_serial_driver *const serial_drivers[] = {
 956         &qt2_device, NULL
 957 };
 958
 959 module_usb_serial_driver(serial_drivers, id_table);
 960
 961 MODULE_DESCRIPTION(DRIVER_DESC);
 962 MODULE_LICENSE("GPL v2");