linux/drivers/usb/serial/quatech2.c
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   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
  75struct 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
  84static 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
  95static 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};
 105MODULE_DEVICE_TABLE(usb, id_table);
 106
 107struct 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
 114struct 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
 129static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch);
 130static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch);
 131static void qt2_write_bulk_callback(struct urb *urb);
 132static void qt2_read_bulk_callback(struct urb *urb);
 133
 134static 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
 146static 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
 159static 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
 171static 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
 179static 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
 187static 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
 205static 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
 215static 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
 245static 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
 263static 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
 336static 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
 406static 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_rcvctrlpipe(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_rcvctrlpipe(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
 449static 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
 456static int get_serial_info(struct tty_struct *tty,
 457                           struct serial_struct *ss)
 458{
 459        struct usb_serial_port *port = tty->driver_data;
 460
 461        ss->line                = port->minor;
 462        ss->port                = 0;
 463        ss->irq                 = 0;
 464        ss->xmit_fifo_size      = port->bulk_out_size;
 465        ss->baud_base           = 9600;
 466        ss->close_delay         = 5*HZ;
 467        ss->closing_wait        = 30*HZ;
 468        return 0;
 469}
 470
 471static void qt2_process_status(struct usb_serial_port *port, unsigned char *ch)
 472{
 473        switch (*ch) {
 474        case QT2_LINE_STATUS:
 475                qt2_update_lsr(port, ch + 1);
 476                break;
 477        case QT2_MODEM_STATUS:
 478                qt2_update_msr(port, ch + 1);
 479                break;
 480        }
 481}
 482
 483/* not needed, kept to document functionality */
 484static void qt2_process_xmit_empty(struct usb_serial_port *port,
 485                                   unsigned char *ch)
 486{
 487        int bytes_written;
 488
 489        bytes_written = (int)(*ch) + (int)(*(ch + 1) << 4);
 490}
 491
 492/* not needed, kept to document functionality */
 493static void qt2_process_flush(struct usb_serial_port *port, unsigned char *ch)
 494{
 495        return;
 496}
 497
 498static void qt2_process_read_urb(struct urb *urb)
 499{
 500        struct usb_serial *serial;
 501        struct qt2_serial_private *serial_priv;
 502        struct usb_serial_port *port;
 503        bool escapeflag;
 504        unsigned char *ch;
 505        int i;
 506        unsigned char newport;
 507        int len = urb->actual_length;
 508
 509        if (!len)
 510                return;
 511
 512        ch = urb->transfer_buffer;
 513        serial = urb->context;
 514        serial_priv = usb_get_serial_data(serial);
 515        port = serial->port[serial_priv->current_port];
 516
 517        for (i = 0; i < urb->actual_length; i++) {
 518                ch = (unsigned char *)urb->transfer_buffer + i;
 519                if ((i <= (len - 3)) &&
 520                    (*ch == QT2_CONTROL_BYTE) &&
 521                    (*(ch + 1) == QT2_CONTROL_BYTE)) {
 522                        escapeflag = false;
 523                        switch (*(ch + 2)) {
 524                        case QT2_LINE_STATUS:
 525                        case QT2_MODEM_STATUS:
 526                                if (i > (len - 4)) {
 527                                        dev_warn(&port->dev,
 528                                                 "%s - status message too short\n",
 529                                                __func__);
 530                                        break;
 531                                }
 532                                qt2_process_status(port, ch + 2);
 533                                i += 3;
 534                                escapeflag = true;
 535                                break;
 536                        case QT2_XMIT_HOLD:
 537                                if (i > (len - 5)) {
 538                                        dev_warn(&port->dev,
 539                                                 "%s - xmit_empty message too short\n",
 540                                                 __func__);
 541                                        break;
 542                                }
 543                                qt2_process_xmit_empty(port, ch + 3);
 544                                i += 4;
 545                                escapeflag = true;
 546                                break;
 547                        case QT2_CHANGE_PORT:
 548                                if (i > (len - 4)) {
 549                                        dev_warn(&port->dev,
 550                                                 "%s - change_port message too short\n",
 551                                                 __func__);
 552                                        break;
 553                                }
 554                                tty_flip_buffer_push(&port->port);
 555
 556                                newport = *(ch + 3);
 557
 558                                if (newport > serial->num_ports) {
 559                                        dev_err(&port->dev,
 560                                                "%s - port change to invalid port: %i\n",
 561                                                __func__, newport);
 562                                        break;
 563                                }
 564
 565                                serial_priv->current_port = newport;
 566                                port = serial->port[serial_priv->current_port];
 567                                i += 3;
 568                                escapeflag = true;
 569                                break;
 570                        case QT2_REC_FLUSH:
 571                        case QT2_XMIT_FLUSH:
 572                                qt2_process_flush(port, ch + 2);
 573                                i += 2;
 574                                escapeflag = true;
 575                                break;
 576                        case QT2_CONTROL_ESCAPE:
 577                                tty_insert_flip_string(&port->port, ch, 2);
 578                                i += 2;
 579                                escapeflag = true;
 580                                break;
 581                        default:
 582                                dev_warn(&port->dev,
 583                                         "%s - unsupported command %i\n",
 584                                         __func__, *(ch + 2));
 585                                break;
 586                        }
 587                        if (escapeflag)
 588                                continue;
 589                }
 590
 591                tty_insert_flip_char(&port->port, *ch, TTY_NORMAL);
 592        }
 593
 594        tty_flip_buffer_push(&port->port);
 595}
 596
 597static void qt2_write_bulk_callback(struct urb *urb)
 598{
 599        struct usb_serial_port *port;
 600        struct qt2_port_private *port_priv;
 601        unsigned long flags;
 602
 603        port = urb->context;
 604        port_priv = usb_get_serial_port_data(port);
 605
 606        spin_lock_irqsave(&port_priv->urb_lock, flags);
 607
 608        port_priv->urb_in_use = false;
 609        usb_serial_port_softint(port);
 610
 611        spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 612
 613}
 614
 615static void qt2_read_bulk_callback(struct urb *urb)
 616{
 617        struct usb_serial *serial = urb->context;
 618        int status;
 619
 620        if (urb->status) {
 621                dev_warn(&serial->dev->dev,
 622                         "%s - non-zero urb status: %i\n", __func__,
 623                         urb->status);
 624                return;
 625        }
 626
 627        qt2_process_read_urb(urb);
 628
 629        status = usb_submit_urb(urb, GFP_ATOMIC);
 630        if (status != 0)
 631                dev_err(&serial->dev->dev,
 632                        "%s - resubmit read urb failed: %i\n",
 633                        __func__, status);
 634}
 635
 636static int qt2_setup_urbs(struct usb_serial *serial)
 637{
 638        struct usb_serial_port *port0;
 639        struct qt2_serial_private *serial_priv;
 640        int status;
 641
 642        port0 = serial->port[0];
 643
 644        serial_priv = usb_get_serial_data(serial);
 645        serial_priv->read_urb = usb_alloc_urb(0, GFP_KERNEL);
 646        if (!serial_priv->read_urb)
 647                return -ENOMEM;
 648
 649        usb_fill_bulk_urb(serial_priv->read_urb, serial->dev,
 650                          usb_rcvbulkpipe(serial->dev,
 651                                          port0->bulk_in_endpointAddress),
 652                          serial_priv->read_buffer,
 653                          QT2_READ_BUFFER_SIZE,
 654                          qt2_read_bulk_callback, serial);
 655
 656        status = usb_submit_urb(serial_priv->read_urb, GFP_KERNEL);
 657        if (status != 0) {
 658                dev_err(&serial->dev->dev,
 659                        "%s - submit read urb failed %i\n", __func__, status);
 660                usb_free_urb(serial_priv->read_urb);
 661                return status;
 662        }
 663
 664        return 0;
 665}
 666
 667static int qt2_attach(struct usb_serial *serial)
 668{
 669        struct qt2_serial_private *serial_priv;
 670        int status;
 671
 672        /* power on unit */
 673        status = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
 674                                 0xc2, 0x40, 0x8000, 0, NULL, 0,
 675                                 QT2_USB_TIMEOUT);
 676        if (status < 0) {
 677                dev_err(&serial->dev->dev,
 678                        "%s - failed to power on unit: %i\n", __func__, status);
 679                return status;
 680        }
 681
 682        serial_priv = kzalloc(sizeof(*serial_priv), GFP_KERNEL);
 683        if (!serial_priv)
 684                return -ENOMEM;
 685
 686        serial_priv->read_buffer = kmalloc(QT2_READ_BUFFER_SIZE, GFP_KERNEL);
 687        if (!serial_priv->read_buffer) {
 688                status = -ENOMEM;
 689                goto err_buf;
 690        }
 691
 692        usb_set_serial_data(serial, serial_priv);
 693
 694        status = qt2_setup_urbs(serial);
 695        if (status != 0)
 696                goto attach_failed;
 697
 698        return 0;
 699
 700attach_failed:
 701        kfree(serial_priv->read_buffer);
 702err_buf:
 703        kfree(serial_priv);
 704        return status;
 705}
 706
 707static int qt2_port_probe(struct usb_serial_port *port)
 708{
 709        struct usb_serial *serial = port->serial;
 710        struct qt2_port_private *port_priv;
 711        u8 bEndpointAddress;
 712
 713        port_priv = kzalloc(sizeof(*port_priv), GFP_KERNEL);
 714        if (!port_priv)
 715                return -ENOMEM;
 716
 717        spin_lock_init(&port_priv->lock);
 718        spin_lock_init(&port_priv->urb_lock);
 719        port_priv->port = port;
 720
 721        port_priv->write_buffer = kmalloc(QT2_WRITE_BUFFER_SIZE, GFP_KERNEL);
 722        if (!port_priv->write_buffer)
 723                goto err_buf;
 724
 725        port_priv->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 726        if (!port_priv->write_urb)
 727                goto err_urb;
 728
 729        bEndpointAddress = serial->port[0]->bulk_out_endpointAddress;
 730        usb_fill_bulk_urb(port_priv->write_urb, serial->dev,
 731                                usb_sndbulkpipe(serial->dev, bEndpointAddress),
 732                                port_priv->write_buffer,
 733                                QT2_WRITE_BUFFER_SIZE,
 734                                qt2_write_bulk_callback, port);
 735
 736        usb_set_serial_port_data(port, port_priv);
 737
 738        return 0;
 739err_urb:
 740        kfree(port_priv->write_buffer);
 741err_buf:
 742        kfree(port_priv);
 743        return -ENOMEM;
 744}
 745
 746static int qt2_port_remove(struct usb_serial_port *port)
 747{
 748        struct qt2_port_private *port_priv;
 749
 750        port_priv = usb_get_serial_port_data(port);
 751        usb_free_urb(port_priv->write_urb);
 752        kfree(port_priv->write_buffer);
 753        kfree(port_priv);
 754
 755        return 0;
 756}
 757
 758static int qt2_tiocmget(struct tty_struct *tty)
 759{
 760        struct usb_serial_port *port = tty->driver_data;
 761        struct usb_device *dev = port->serial->dev;
 762        struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 763        u8 *d;
 764        int r;
 765
 766        d = kzalloc(2, GFP_KERNEL);
 767        if (!d)
 768                return -ENOMEM;
 769
 770        r = qt2_getregister(dev, port_priv->device_port, UART_MCR, d);
 771        if (r < 0)
 772                goto mget_out;
 773
 774        r = qt2_getregister(dev, port_priv->device_port, UART_MSR, d + 1);
 775        if (r < 0)
 776                goto mget_out;
 777
 778        r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 779            (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 780            (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 781            (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 782            (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 783            (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 784
 785mget_out:
 786        kfree(d);
 787        return r;
 788}
 789
 790static int qt2_tiocmset(struct tty_struct *tty,
 791                        unsigned int set, unsigned int clear)
 792{
 793        struct qt2_port_private *port_priv;
 794
 795        port_priv = usb_get_serial_port_data(tty->driver_data);
 796        return update_mctrl(port_priv, set, clear);
 797}
 798
 799static void qt2_break_ctl(struct tty_struct *tty, int break_state)
 800{
 801        struct usb_serial_port *port = tty->driver_data;
 802        struct qt2_port_private *port_priv;
 803        int status;
 804        u16 val;
 805
 806        port_priv = usb_get_serial_port_data(port);
 807
 808        val = (break_state == -1) ? 1 : 0;
 809
 810        status = qt2_control_msg(port->serial->dev, QT2_BREAK_CONTROL,
 811                                 val, port_priv->device_port);
 812        if (status < 0)
 813                dev_warn(&port->dev,
 814                         "%s - failed to send control message: %i\n", __func__,
 815                         status);
 816}
 817
 818
 819
 820static void qt2_dtr_rts(struct usb_serial_port *port, int on)
 821{
 822        struct usb_device *dev = port->serial->dev;
 823        struct qt2_port_private *port_priv = usb_get_serial_port_data(port);
 824
 825        /* Disable flow control */
 826        if (!on) {
 827                if (qt2_setregister(dev, port_priv->device_port,
 828                                           UART_MCR, 0) < 0)
 829                        dev_warn(&port->dev, "error from flowcontrol urb\n");
 830        }
 831        /* drop RTS and DTR */
 832        if (on)
 833                update_mctrl(port_priv, TIOCM_DTR | TIOCM_RTS, 0);
 834        else
 835                update_mctrl(port_priv, 0, TIOCM_DTR | TIOCM_RTS);
 836}
 837
 838static void qt2_update_msr(struct usb_serial_port *port, unsigned char *ch)
 839{
 840        struct qt2_port_private *port_priv;
 841        u8 newMSR = (u8) *ch;
 842        unsigned long flags;
 843
 844        port_priv = usb_get_serial_port_data(port);
 845
 846        spin_lock_irqsave(&port_priv->lock, flags);
 847        port_priv->shadowMSR = newMSR;
 848        spin_unlock_irqrestore(&port_priv->lock, flags);
 849
 850        if (newMSR & UART_MSR_ANY_DELTA) {
 851                /* update input line counters */
 852                if (newMSR & UART_MSR_DCTS)
 853                        port->icount.cts++;
 854                if (newMSR & UART_MSR_DDSR)
 855                        port->icount.dsr++;
 856                if (newMSR & UART_MSR_DDCD)
 857                        port->icount.dcd++;
 858                if (newMSR & UART_MSR_TERI)
 859                        port->icount.rng++;
 860
 861                wake_up_interruptible(&port->port.delta_msr_wait);
 862        }
 863}
 864
 865static void qt2_update_lsr(struct usb_serial_port *port, unsigned char *ch)
 866{
 867        struct qt2_port_private *port_priv;
 868        struct async_icount *icount;
 869        unsigned long flags;
 870        u8 newLSR = (u8) *ch;
 871
 872        port_priv = usb_get_serial_port_data(port);
 873
 874        if (newLSR & UART_LSR_BI)
 875                newLSR &= (u8) (UART_LSR_OE | UART_LSR_BI);
 876
 877        spin_lock_irqsave(&port_priv->lock, flags);
 878        port_priv->shadowLSR = newLSR;
 879        spin_unlock_irqrestore(&port_priv->lock, flags);
 880
 881        icount = &port->icount;
 882
 883        if (newLSR & UART_LSR_BRK_ERROR_BITS) {
 884
 885                if (newLSR & UART_LSR_BI)
 886                        icount->brk++;
 887
 888                if (newLSR & UART_LSR_OE)
 889                        icount->overrun++;
 890
 891                if (newLSR & UART_LSR_PE)
 892                        icount->parity++;
 893
 894                if (newLSR & UART_LSR_FE)
 895                        icount->frame++;
 896        }
 897
 898}
 899
 900static int qt2_write_room(struct tty_struct *tty)
 901{
 902        struct usb_serial_port *port = tty->driver_data;
 903        struct qt2_port_private *port_priv;
 904        unsigned long flags = 0;
 905        int r;
 906
 907        port_priv = usb_get_serial_port_data(port);
 908
 909        spin_lock_irqsave(&port_priv->urb_lock, flags);
 910
 911        if (port_priv->urb_in_use)
 912                r = 0;
 913        else
 914                r = QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE;
 915
 916        spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 917
 918        return r;
 919}
 920
 921static int qt2_write(struct tty_struct *tty,
 922                     struct usb_serial_port *port,
 923                     const unsigned char *buf, int count)
 924{
 925        struct qt2_port_private *port_priv;
 926        struct urb *write_urb;
 927        unsigned char *data;
 928        unsigned long flags;
 929        int status;
 930        int bytes_out = 0;
 931
 932        port_priv = usb_get_serial_port_data(port);
 933
 934        if (port_priv->write_urb == NULL) {
 935                dev_err(&port->dev, "%s - no output urb\n", __func__);
 936                return 0;
 937        }
 938        write_urb = port_priv->write_urb;
 939
 940        count = min(count, QT2_WRITE_BUFFER_SIZE - QT2_WRITE_CONTROL_SIZE);
 941
 942        data = write_urb->transfer_buffer;
 943        spin_lock_irqsave(&port_priv->urb_lock, flags);
 944        if (port_priv->urb_in_use) {
 945                dev_err(&port->dev, "qt2_write - urb is in use\n");
 946                goto write_out;
 947        }
 948
 949        *data++ = QT2_CONTROL_BYTE;
 950        *data++ = QT2_CONTROL_BYTE;
 951        *data++ = port_priv->device_port;
 952        put_unaligned_le16(count, data);
 953        data += 2;
 954        memcpy(data, buf, count);
 955
 956        write_urb->transfer_buffer_length = count + QT2_WRITE_CONTROL_SIZE;
 957
 958        status = usb_submit_urb(write_urb, GFP_ATOMIC);
 959        if (status == 0) {
 960                port_priv->urb_in_use = true;
 961                bytes_out += count;
 962        }
 963
 964write_out:
 965        spin_unlock_irqrestore(&port_priv->urb_lock, flags);
 966        return bytes_out;
 967}
 968
 969
 970static struct usb_serial_driver qt2_device = {
 971        .driver = {
 972                .owner = THIS_MODULE,
 973                .name = "quatech-serial",
 974        },
 975        .description         = DRIVER_DESC,
 976        .id_table            = id_table,
 977        .open                = qt2_open,
 978        .close               = qt2_close,
 979        .write               = qt2_write,
 980        .write_room          = qt2_write_room,
 981        .calc_num_ports      = qt2_calc_num_ports,
 982        .attach              = qt2_attach,
 983        .release             = qt2_release,
 984        .disconnect          = qt2_disconnect,
 985        .port_probe          = qt2_port_probe,
 986        .port_remove         = qt2_port_remove,
 987        .dtr_rts             = qt2_dtr_rts,
 988        .break_ctl           = qt2_break_ctl,
 989        .tiocmget            = qt2_tiocmget,
 990        .tiocmset            = qt2_tiocmset,
 991        .tiocmiwait          = usb_serial_generic_tiocmiwait,
 992        .get_icount          = usb_serial_generic_get_icount,
 993        .get_serial          = get_serial_info,
 994        .set_termios         = qt2_set_termios,
 995};
 996
 997static struct usb_serial_driver *const serial_drivers[] = {
 998        &qt2_device, NULL
 999};
1000
1001module_usb_serial_driver(serial_drivers, id_table);
1002
1003MODULE_DESCRIPTION(DRIVER_DESC);
1004MODULE_LICENSE("GPL v2");
1005