drivers/usb/serial/quatech2.c

   1 /*
   2  * usb-serial driver for Quatech USB 2 devices
   3  *
   4  * Copyright (C) 2012 Bill Pemberton (wfp5p@virginia.edu)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version 2
   8  * as published by the Free Software Foundation.
   9  *
  10  *
  11  *  These devices all have only 1 bulk in and 1 bulk out that is shared
  12  *  for all serial ports.
  13  *
  14  */
  15
  16 #include <asm/unaligned.h>
  17 #include <linux/errno.h>
  18 #include <linux/init.h>
  19 #include <linux/slab.h>
  20 #include <linux/tty.h>
  21 #include <linux/tty_driver.h>
  22 #include <linux/tty_flip.h>
  23 #include <linux/module.h>
  24 #include <linux/serial.h>
  25 #include <linux/usb.h>
  26 #include <linux/usb/serial.h>
  27 #include <linux/serial_reg.h>
  28 #include <linux/uaccess.h>
  29
  30 /* default urb timeout for usb operations */
  31 #define QT2_USB_TIMEOUT USB_CTRL_SET_TIMEOUT
  32
  33 #define QT_OPEN_CLOSE_CHANNEL       0xca
  34 #define QT_SET_GET_DEVICE           0xc2
  35 #define QT_SET_GET_REGISTER         0xc0
  36 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  37 #define QT_SET_ATF                  0xcd
  38 #define QT_TRANSFER_IN              0xc0
  39 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  40 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  41 #define QT2_BREAK_CONTROL           0xc8
  42 #define QT2_GET_SET_UART            0xc1
  43 #define QT2_FLUSH_DEVICE            0xc4
  44 #define QT2_GET_SET_QMCR            0xe1
  45 #define QT2_QMCR_RS232              0x40
  46 #define QT2_QMCR_RS422              0x10
  47
  48 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
  49
  50 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
  51
  52 /* status bytes for the device */
  53 #define QT2_CONTROL_BYTE    0x1b
  54 #define QT2_LINE_STATUS     0x00  /* following 1 byte is line status */
  55 #define QT2_MODEM_STATUS    0x01  /* following 1 byte is modem status */
  56 #define QT2_XMIT_HOLD       0x02  /* following 2 bytes are ?? */
  57 #define QT2_CHANGE_PORT     0x03  /* following 1 byte is port to change to */
  58 #define QT2_REC_FLUSH       0x04  /* no following info */
  59 #define QT2_XMIT_FLUSH      0x05  /* no following info */
  60 #define QT2_CONTROL_ESCAPE  0xff  /* pass through previous 2 control bytes */
  61
  62 #define  MAX_BAUD_RATE              921600
  63 #define  DEFAULT_BAUD_RATE          9600
  64
  65 #define QT2_READ_BUFFER_SIZE    512  /* size of read buffer */
  66 #define QT2_WRITE_BUFFER_SIZE   512  /* size of write buffer */
  67 #define QT2_WRITE_CONTROL_SIZE  5    /* control bytes used for a write */
  68
  69 #define DRIVER_DESC "Quatech 2nd gen USB to Serial Driver"
  70
  71 #define USB_VENDOR_ID_QUATECH   0x061d
  72 #define QUATECH_SSU2_100        0xC120  /* RS232 single port */
  73 #define QUATECH_DSU2_100        0xC140  /* RS232 dual port */
  74 #define QUATECH_DSU2_400        0xC150  /* RS232/422/485 dual port */
  75 #define QUATECH_QSU2_100        0xC160  /* RS232 four port */
  76 #define QUATECH_QSU2_400        0xC170  /* RS232/422/485 four port */
  77 #define QUATECH_ESU2_100        0xC1A0  /* RS232 eight port */
  78 #define QUATECH_ESU2_400        0xC180  /* RS232/422/485 eight port */
  79
  80 struct qt2_device_detail {
  81         int product_id;
  82         int num_ports;
  83 };
  84
  85 #define QT_DETAILS(prod, ports) \
  86         .product_id = (prod),   \
  87         .num_ports = (ports)
  88
  89 static const struct qt2_device_detail qt2_device_details[] = {
  90         {QT_DETAILS(QUATECH_SSU2_100, 1)},
  91         {QT_DETAILS(QUATECH_DSU2_400, 2)},
  92         {QT_DETAILS(QUATECH_DSU2_100, 2)},
  93         {QT_DETAILS(QUATECH_QSU2_400, 4)},
  94         {QT_DETAILS(QUATECH_QSU2_100, 4)},
  95         {QT_DETAILS(QUATECH_ESU2_400, 8)},
  96         {QT_DETAILS(QUATECH_ESU2_100, 8)},
  97         {QT_DETAILS(0, 0)}      /* Terminating entry */
  98 };
  99
 100 static const struct usb_device_id id_table[] = {
 101         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU2_100)},
 102         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_100)},
 103         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_DSU2_400)},
 104         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_100)},
 105         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_QSU2_400)},
 106         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_100)},
 107         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_ESU2_400)},
 108         {}                      /* Terminating entry */
 109 };
 110 MODULE_DEVICE_TABLE(usb, id_table);
 111
 112 struct qt2_serial_private {
 113         unsigned char current_port;  /* current port for incoming data */
 114
 115         struct urb      *read_urb;   /* shared among all ports */
 116         char            *read_buffer;
 117 };
 118
 119 struct qt2_port_private {
 120         u8   device_port;
 121
 122         spinlock_t urb_lock;
 123         bool       urb_in_use;
 124         struct urb *write_urb;
 125         char       *write_buffer;
 126
 127         spinlock_t  lock;
 128         u8          shadowLSR;
 129         u8          shadowMSR;
 130
 131         struct usb_serial_port *port;
 132 };
 133
 134 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
 135 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
 136 static void qt2_write_bulk_callback(struct urb *urb);
 137 static void qt2_read_bulk_callback(struct urb *urb);
 138
 139 static void qt2_release(struct usb_serial *serial)
 140 {
 141         struct qt2_serial_private *serial_priv;
 142
 143         serial_priv = usb_get_serial_data(serial);
 144
 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_getdevice(struct usb_device *dev, u8 *data)
 192 {
 193         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 194                                QT_SET_GET_DEVICE, 0xc0, 0, 0,
 195                                data, 3, QT2_USB_TIMEOUT);
 196 }
 197
 198 static inline int qt2_getregister(struct usb_device *dev,
 199                                   u8 uart,
 200                                   u8 reg,
 201                                   u8 *data)
 202 {
 203         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 204                                QT_SET_GET_REGISTER, 0xc0, reg,
 205                                uart, data, sizeof(*data), QT2_USB_TIMEOUT);
 206
 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 < 0) {
 376                 dev_err(&port->dev, "%s - open port failed %i", __func__,
 377                         status);
 378                 kfree(data);
 379                 return status;
 380         }
 381
 382         spin_lock_irqsave(&port_priv->lock, flags);
 383         port_priv->shadowLSR = data[0];
 384         port_priv->shadowMSR = data[1];
 385         spin_unlock_irqrestore(&port_priv->lock, flags);
 386
 387         kfree(data);
 388
 389         /* set to default speed and 8bit word size */
 390         status = qt2_set_port_config(serial->dev, device_port,
 391                                      DEFAULT_BAUD_RATE, UART_LCR_WLEN8);
 392         if (status < 0) {
 393                 dev_err(&port->dev, "%s - initial setup failed (%i)\n",
 394                         __func__, device_port);
 395                 return status;
 396         }
 397
 398         port_priv->device_port = (u8) device_port;
 399
 400         if (tty)
 401                 qt2_set_termios(tty, port, &tty->termios);
 402
 403         return 0;
 404
 405 }
 406
 407 static void qt2_close(struct usb_serial_port *port)
 408 {
 409         struct usb_serial *serial;
 410         struct qt2_port_private *port_priv;
 411         unsigned long flags;
 412         int i;
 413
 414         serial = port->serial;
 415         port_priv = usb_get_serial_port_data(port);
 416
 417         spin_lock_irqsave(&port_priv->urb_lock, flags);
 418         usb_kill_urb(port_priv->write_urb);
 419         port_priv->urb_in_use = false;
 420         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 421
 422         /* flush the port transmit buffer */
 423         i = usb_control_msg(serial->dev,
 424                             usb_rcvctrlpipe(serial->dev, 0),
 425                             QT2_FLUSH_DEVICE, 0x40, 1,
 426                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 427
 428         if (i < 0)
 429                 dev_err(&port->dev, "%s - transmit buffer flush failed: %i\n",
 430                         __func__, i);
 431
 432         /* flush the port receive buffer */
 433         i = usb_control_msg(serial->dev,
 434                             usb_rcvctrlpipe(serial->dev, 0),
 435                             QT2_FLUSH_DEVICE, 0x40, 0,
 436                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 437
 438         if (i < 0)
 439                 dev_err(&port->dev, "%s - receive buffer flush failed: %i\n",
 440                         __func__, i);
 441
 442         /* close the port */
 443         i = usb_control_msg(serial->dev,
 444                             usb_sndctrlpipe(serial->dev, 0),
 445                             QT_OPEN_CLOSE_CHANNEL,
 446                             0x40, 0,
 447                             port_priv->device_port, NULL, 0, QT2_USB_TIMEOUT);
 448
 449         if (i < 0)
 450                 dev_err(&port->dev, "%s - close port failed %i\n",
 451                         __func__, i);
 452 }
 453
 454 static void qt2_disconnect(struct usb_serial *serial)
 455 {
 456         struct qt2_serial_private *serial_priv = usb_get_serial_data(serial);
 457
 458         usb_kill_urb(serial_priv->read_urb);
 459 }
 460
 461 static int get_serial_info(struct usb_serial_port *port,
 462                            struct serial_struct __user *retinfo)
 463 {
 464         struct serial_struct tmp;
 465
 466         if (!retinfo)
 467                 return -EFAULT;
 468
 469         memset(&tmp, 0, sizeof(tmp));
 470         tmp.line                = port->minor;
 471         tmp.port                = 0;
 472         tmp.irq                 = 0;
 473         tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
 474         tmp.xmit_fifo_size      = port->bulk_out_size;
 475         tmp.baud_base           = 9600;
 476         tmp.close_delay         = 5*HZ;
 477         tmp.closing_wait        = 30*HZ;
 478
 479         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 480                 return -EFAULT;
 481         return 0;
 482 }
 483
 484 static int qt2_ioctl(struct tty_struct *tty,
 485                      unsigned int cmd, unsigned long arg)
 486 {
 487         struct usb_serial_port *port = tty->driver_data;
 488
 489         switch (cmd) {
 490         case TIOCGSERIAL:
 491                 return get_serial_info(port,
 492                                        (struct serial_struct __user *)arg);
 493         default:
 494                 break;
 495         }
 496
 497         return -ENOIOCTLCMD;
 498 }
 499
 500 static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
 501 {
 502         switch (*ch) {
 503         case QT2_LINE_STATUS:
 504                 qt2_update_lsr(port, ch + 1);
 505                 break;
 506         case QT2_MODEM_STATUS:
 507                 qt2_update_msr(port, ch + 1);
 508                 break;
 509         }
 510 }
 511
 512 /* not needed, kept to document functionality */
 513 static void qt2_process_xmit_empty(struct usb_serial_port *port,
 514                                    unsigned char *ch)
 515 {
 516         int bytes_written;
 517
 518         bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
 519 }
 520
 521 /* not needed, kept to document functionality */
 522 static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
 523 {
 524         return;
 525 }
 526
 527 static void qt2_process_read_urb(struct urb *urb)
 528 {
 529         struct usb_serial *serial;
 530         struct qt2_serial_private *serial_priv;
 531         struct usb_serial_port *port;
 532         struct qt2_port_private *port_priv;
 533         bool escapeflag;
 534         unsigned char *ch;
 535         int i;
 536         unsigned char newport;
 537         int len = urb->actual_length;
 538
 539         if (!len)
 540                 return;
 541
 542         ch = urb->transfer_buffer;
 543         serial = urb->context;
 544         serial_priv = usb_get_serial_data(serial);
 545         port = serial->port[serial_priv->current_port];
 546         port_priv = usb_get_serial_port_data(port);
 547
 548         for (i = 0; i < urb->actual_length; i++) {
 549                 ch = (unsigned char *)urb->transfer_buffer + i;
 550                 if ((i <= (len - 3)) &&
 551                     (*ch == QT2_CONTROL_BYTE) &&
 552                     (*(ch + 1) == QT2_CONTROL_BYTE)) {
 553                         escapeflag = false;
 554                         switch (*(ch + 2)) {
 555                         case QT2_LINE_STATUS:
 556                         case QT2_MODEM_STATUS:
 557                                 if (i > (len - 4)) {
 558                                         dev_warn(&port->dev,
 559                                                  "%s - status message too short\n",
 560                                                 __func__);
 561                                         break;
 562                                 }
 563                                 qt2_process_status(port, ch + 2);
 564                                 i += 3;
 565                                 escapeflag = true;
 566                                 break;
 567                         case QT2_XMIT_HOLD:
 568                                 if (i > (len - 5)) {
 569                                         dev_warn(&port->dev,
 570                                                  "%s - xmit_empty message too short\n",
 571                                                  __func__);
 572                                         break;
 573                                 }
 574                                 qt2_process_xmit_empty(port, ch + 3);
 575                                 i += 4;
 576                                 escapeflag = true;
 577                                 break;
 578                         case QT2_CHANGE_PORT:
 579                                 if (i > (len - 4)) {
 580                                         dev_warn(&port->dev,
 581                                                  "%s - change_port message too short\n",
 582                                                  __func__);
 583                                         break;
 584                                 }
 585                                 tty_flip_buffer_push(&port->port);
 586
 587                                 newport = *(ch + 3);
 588
 589                                 if (newport > serial->num_ports) {
 590                                         dev_err(&port->dev,
 591                                                 "%s - port change to invalid port: %i\n",
 592                                                 __func__, newport);
 593                                         break;
 594                                 }
 595
 596                                 serial_priv->current_port = newport;
 597                                 port = serial->port[serial_priv->current_port];
 598                                 port_priv = usb_get_serial_port_data(port);
 599                                 i += 3;
 600                                 escapeflag = true;
 601                                 break;
 602                         case QT2_REC_FLUSH:
 603                         case QT2_XMIT_FLUSH:
 604                                 qt2_process_flush(port, ch + 2);
 605                                 i += 2;
 606                                 escapeflag = true;
 607                                 break;
 608                         case QT2_CONTROL_ESCAPE:
 609                                 tty_buffer_request_room(&port->port, 2);
 610                                 tty_insert_flip_string(&port->port, ch, 2);
 611                                 i += 2;
 612                                 escapeflag = true;
 613                                 break;
 614                         default:
 615                                 dev_warn(&port->dev,
 616                                          "%s - unsupported command %i\n",
 617                                          __func__, *(ch + 2));
 618                                 break;
 619                         }
 620                         if (escapeflag)
 621                                 continue;
 622                 }
 623
 624                 tty_buffer_request_room(&port->port, 1);
 625                 tty_insert_flip_string(&port->port, ch, 1);
 626         }
 627
 628         tty_flip_buffer_push(&port->port);
 629 }
 630
 631 static void qt2_write_bulk_callback(struct urb *urb)
 632 {
 633         struct usb_serial_port *port;
 634         struct qt2_port_private *port_priv;
 635
 636         port = urb->context;
 637         port_priv = usb_get_serial_port_data(port);
 638
 639         spin_lock(&port_priv->urb_lock);
 640
 641         port_priv->urb_in_use = false;
 642         usb_serial_port_softint(port);
 643
 644         spin_unlock(&port_priv->urb_lock);
 645
 646 }
 647
 648 static void qt2_read_bulk_callback(struct urb *urb)
 649 {
 650         struct usb_serial *serial = urb->context;
 651         int status;
 652
 653         if (urb->status) {
 654                 dev_warn(&serial->dev->dev,
 655                          "%s - non-zero urb status: %i\n", __func__,
 656                          urb->status);
 657                 return;
 658         }
 659
 660         qt2_process_read_urb(urb);
 661
 662         status = usb_submit_urb(urb, GFP_ATOMIC);
 663         if (status != 0)
 664                 dev_err(&serial->dev->dev,
 665                         "%s - resubmit read urb failed: %i\n",
 666                         __func__, status);
 667 }
 668
 669 static int qt2_setup_urbs(struct usb_serial *serial)
 670 {
 671         struct usb_serial_port *port0;
 672         struct qt2_serial_private *serial_priv;
 673         int status;
 674
 675         port0 = serial->port[0];
 676
 677         serial_priv = usb_get_serial_data(serial);
 678         serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 679         if (!serial_priv->read_urb) {
 680                 dev_err(&serial->dev->dev, "No free urbs available\n");
 681                 return -ENOMEM;
 682         }
 683
 684         usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
 685                           usb_rcvbulkpipe(serial->dev,
 686                                           port0->bulk_in_endpointAddress),
 687                           serial_priv->read_buffer,
 688                           QT2_READ_BUFFER_SIZE,
 689                           qt2_read_bulk_callback, serial);
 690
 691         status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
 692         if (status != 0) {
 693                 dev_err(&serial->dev->dev,
 694                         "%s - submit read urb failed %i\n", __func__, status);
 695                 usb_free_urb(serial_priv->read_urb);
 696                 return status;
 697         }
 698
 699         return 0;
 700 }
 701
 702 static int qt2_attach(struct usb_serial *serial)
 703 {
 704         struct qt2_serial_private *serial_priv;
 705         int status;
 706
 707         /* power on unit */
 708         status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 709                                  0xc2, 0x40, 0x8000, 0, NULL, 0,
 710                                  QT2_USB_TIMEOUT);
 711         if (status < 0) {
 712                 dev_err(&serial->dev->dev,
 713                         "%s - failed to power on unit: %i\n", __func__, status);
 714                 return status;
 715         }
 716
 717         serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 718         if (!serial_priv) {
 719                 dev_err(&serial->dev->dev, "%s - Out of memory\n", __func__);
 720                 return -ENOMEM;
 721         }
 722
 723         serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
 724         if (!serial_priv->read_buffer) {
 725                 status = -ENOMEM;
 726                 goto err_buf;
 727         }
 728
 729         usb_set_serial_data(serial, serial_priv);
 730
 731         status = qt2_setup_urbs(serial);
 732         if (status != 0)
 733                 goto attach_failed;
 734
 735         return 0;
 736
 737 attach_failed:
 738         kfree(serial_priv->read_buffer);
 739 err_buf:
 740         kfree(serial_priv);
 741         return status;
 742 }
 743
 744 static int qt2_port_probe(struct usb_serial_port *port)
 745 {
 746         struct usb_serial *serial = port->serial;
 747         struct qt2_port_private *port_priv;
 748         u8 bEndpointAddress;
 749
 750         port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
 751         if (!port_priv)
 752                 return -ENOMEM;
 753
 754         spin_lock_init(&port_priv->lock);
 755         spin_lock_init(&port_priv->urb_lock);
 756         port_priv->port = port;
 757
 758         port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
 759         if (!port_priv->write_buffer)
 760                 goto err_buf;
 761
 762         port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 763         if (!port_priv->write_urb)
 764                 goto err_urb;
 765
 766         bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
 767         usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
 768                                 usb_sndbulkpipe(serial->dev, bEndpointAddress),
 769                                 port_priv->write_buffer,
 770                                 QT2_WRITE_BUFFER_SIZE,
 771                                 qt2_write_bulk_callback, port);
 772
 773         usb_set_serial_port_data(port, port_priv);
 774
 775         return 0;
 776 err_urb:
 777         kfree(port_priv->write_buffer);
 778 err_buf:
 779         kfree(port_priv);
 780         return -ENOMEM;
 781 }
 782
 783 static int qt2_port_remove(struct usb_serial_port *port)
 784 {
 785         struct qt2_port_private *port_priv;
 786
 787         port_priv = usb_get_serial_port_data(port);
 788         usb_free_urb(port_priv->write_urb);
 789         kfree(port_priv->write_buffer);
 790         kfree(port_priv);
 791
 792         return 0;
 793 }
 794
 795 static int qt2_tiocmget(struct tty_struct *tty)
 796 {
 797         struct usb_serial_port *port = tty->driver_data;
 798         struct usb_device *dev = port->serial->dev;
 799         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 800         u8 *d;
 801         int r;
 802
 803         d = kzalloc(2, GFP_KERNEL);
 804         if (!d)
 805                 return -ENOMEM;
 806
 807         r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
 808         if (r < 0)
 809                 goto mget_out;
 810
 811         r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
 812         if (r < 0)
 813                 goto mget_out;
 814
 815         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 816             (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 817             (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 818             (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 819             (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 820             (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 821
 822 mget_out:
 823         kfree(d);
 824         return r;
 825 }
 826
 827 static int qt2_tiocmset(struct tty_struct *tty,
 828                         unsigned int set, unsigned int clear)
 829 {
 830         struct qt2_port_private *port_priv;
 831
 832         port_priv = usb_get_serial_port_data(tty->driver_data);
 833         return update_mctrl(port_priv, set, clear);
 834 }
 835
 836 static void qt2_break_ctl(struct tty_struct *tty, int break_state)
 837 {
 838         struct usb_serial_port *port = tty->driver_data;
 839         struct qt2_port_private *port_priv;
 840         int status;
 841         u16 val;
 842
 843         port_priv = usb_get_serial_port_data(port);
 844
 845         val = (break_state == -1) ? 1 : 0;
 846
 847         status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
 848                                  val, port_priv->device_port);
 849         if (status < 0)
 850                 dev_warn(&port->dev,
 851                          "%s - failed to send control message: %i\n", __func__,
 852                          status);
 853 }
 854
 855
 856
 857 static void qt2_dtr_rts(struct usb_serial_port *port, int on)
 858 {
 859         struct usb_device *dev = port->serial->dev;
 860         struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 861
 862         /* Disable flow control */
 863         if (!on) {
 864                 if (qt2_setregister(dev, port_priv->device_port,
 865                                            UART_MCR, 0) < 0)
 866                         dev_warn(&port->dev, "error from flowcontrol urb\n");
 867         }
 868         /* drop RTS and DTR */
 869         if (on)
 870                 update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
 871         else
 872                 update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 873 }
 874
 875 static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
 876 {
 877         struct qt2_port_private *port_priv;
 878         u8 newMSR = (u8) *ch;
 879         unsigned long flags;
 880
 881         port_priv = usb_get_serial_port_data(port);
 882
 883         spin_lock_irqsave(&port_priv->lock, flags);
 884         port_priv->shadowMSR = newMSR;
 885         spin_unlock_irqrestore(&port_priv->lock, flags);
 886
 887         if (newMSR & UART_MSR_ANY_DELTA) {
 888                 /* update input line counters */
 889                 if (newMSR & UART_MSR_DCTS)
 890                         port->icount.cts++;
 891                 if (newMSR & UART_MSR_DDSR)
 892                         port->icount.dsr++;
 893                 if (newMSR & UART_MSR_DDCD)
 894                         port->icount.dcd++;
 895                 if (newMSR & UART_MSR_TERI)
 896                         port->icount.rng++;
 897
 898                 wake_up_interruptible(&port->port.delta_msr_wait);
 899         }
 900 }
 901
 902 static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
 903 {
 904         struct qt2_port_private *port_priv;
 905         struct async_icount *icount;
 906         unsigned long flags;
 907         u8 newLSR = (u8) *ch;
 908
 909         port_priv = usb_get_serial_port_data(port);
 910
 911         if (newLSR & UART_LSR_BI)
 912                 newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
 913
 914         spin_lock_irqsave(&port_priv->lock, flags);
 915         port_priv->shadowLSR = newLSR;
 916         spin_unlock_irqrestore(&port_priv->lock, flags);
 917
 918         icount = &port->icount;
 919
 920         if (newLSR & UART_LSR_BRK_ERROR_BITS) {
 921
 922                 if (newLSR & UART_LSR_BI)
 923                         icount->brk++;
 924
 925                 if (newLSR & UART_LSR_OE)
 926                         icount->overrun++;
 927
 928                 if (newLSR & UART_LSR_PE)
 929                         icount->parity++;
 930
 931                 if (newLSR & UART_LSR_FE)
 932                         icount->frame++;
 933         }
 934
 935 }
 936
 937 static int qt2_write_room(struct tty_struct *tty)
 938 {
 939         struct usb_serial_port *port = tty->driver_data;
 940         struct qt2_port_private *port_priv;
 941         unsigned long flags = 0;
 942         int r;
 943
 944         port_priv = usb_get_serial_port_data(port);
 945
 946         spin_lock_irqsave(&port_priv->urb_lock, flags);
 947
 948         if (port_priv->urb_in_use)
 949                 r = 0;
 950         else
 951                 r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
 952
 953         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 954
 955         return r;
 956 }
 957
 958 static int qt2_write(struct tty_struct *tty,
 959                      struct usb_serial_port *port,
 960                      const unsigned char *buf, int count)
 961 {
 962         struct qt2_port_private *port_priv;
 963         struct urb *write_urb;
 964         unsigned char *data;
 965         unsigned long flags;
 966         int status;
 967         int bytes_out = 0;
 968
 969         port_priv = usb_get_serial_port_data(port);
 970
 971         if (port_priv->write_urb == NULL) {
 972                 dev_err(&port->dev, "%s - no output urb\n", __func__);
 973                 return 0;
 974         }
 975         write_urb = port_priv->write_urb;
 976
 977         count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
 978
 979         data = write_urb->transfer_buffer;
 980         spin_lock_irqsave(&port_priv->urb_lock, flags);
 981         if (port_priv->urb_in_use == true) {
 982                 dev_err(&port->dev, "qt2_write - urb is in use\n");
 983                 goto write_out;
 984         }
 985
 986         *data++ = QT2_CONTROL_BYTE;
 987         *data++ = QT2_CONTROL_BYTE;
 988         *data++ = port_priv->device_port;
 989         put_unaligned_le16(count, data);
 990         data += 2;
 991         memcpy(data, buf, count);
 992
 993         write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
 994
 995         status = usb_submit_urb(write_urb, GFP_ATOMIC);
 996         if (status == 0) {
 997                 port_priv->urb_in_use = true;
 998                 bytes_out += count;
 999         }
1000
1001 write_out:
1002         spin_unlock_irqrestore(&port_priv->urb_lock, flags);
1003         return bytes_out;
1004 }
1005
1006
1007 static struct usb_serial_driver qt2_device = {
1008         .driver = {
1009                 .owner = THIS_MODULE,
1010                 .name = "quatech-serial",
1011         },
1012         .description         = DRIVER_DESC,
1013         .id_table            = id_table,
1014         .open                = qt2_open,
1015         .close               = qt2_close,
1016         .write               = qt2_write,
1017         .write_room          = qt2_write_room,
1018         .calc_num_ports      = qt2_calc_num_ports,
1019         .attach              = qt2_attach,
1020         .release             = qt2_release,
1021         .disconnect          = qt2_disconnect,
1022         .port_probe          = qt2_port_probe,
1023         .port_remove         = qt2_port_remove,
1024         .dtr_rts             = qt2_dtr_rts,
1025         .break_ctl           = qt2_break_ctl,
1026         .tiocmget            = qt2_tiocmget,
1027         .tiocmset            = qt2_tiocmset,
1028         .tiocmiwait          = usb_serial_generic_tiocmiwait,
1029         .get_icount          = usb_serial_generic_get_icount,
1030         .ioctl               = qt2_ioctl,
1031         .set_termios         = qt2_set_termios,
1032 };
1033
1034 static struct usb_serial_driver *const serial_drivers[] = {
1035         &qt2_device, NULL
1036 };
1037
1038 module_usb_serial_driver(serial_drivers, id_table);
1039
1040 MODULE_DESCRIPTION(DRIVER_DESC);
1041 MODULE_LICENSE("GPL");