drivers/usb/serial/ssu100.c

   1 /*
   2  * usb-serial driver for Quatech SSU-100
   3  *
   4  * based on ftdi_sio.c and the original serqt_usb.c from Quatech
   5  *
   6  */
   7
   8 #include <linux/errno.h>
   9 #include <linux/slab.h>
  10 #include <linux/tty.h>
  11 #include <linux/tty_driver.h>
  12 #include <linux/tty_flip.h>
  13 #include <linux/module.h>
  14 #include <linux/serial.h>
  15 #include <linux/usb.h>
  16 #include <linux/usb/serial.h>
  17 #include <linux/serial_reg.h>
  18 #include <linux/uaccess.h>
  19
  20 #define QT_OPEN_CLOSE_CHANNEL       0xca
  21 #define QT_SET_GET_DEVICE           0xc2
  22 #define QT_SET_GET_REGISTER         0xc0
  23 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  24 #define QT_SET_ATF                  0xcd
  25 #define QT_GET_SET_UART             0xc1
  26 #define QT_TRANSFER_IN              0xc0
  27 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  28 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  29
  30 #define  SERIAL_MSR_MASK            0xf0
  31
  32 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
  33
  34 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
  35
  36 #define  MAX_BAUD_RATE              460800
  37
  38 #define ATC_DISABLED                0x00
  39 #define DUPMODE_BITS        0xc0
  40 #define RR_BITS             0x03
  41 #define LOOPMODE_BITS       0x41
  42 #define RS232_MODE          0x00
  43 #define RTSCTS_TO_CONNECTOR 0x40
  44 #define CLKS_X4             0x02
  45 #define FULLPWRBIT          0x00000080
  46 #define NEXT_BOARD_POWER_BIT        0x00000004
  47
  48 #define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"
  49
  50 #define USB_VENDOR_ID_QUATECH   0x061d  /* Quatech VID */
  51 #define QUATECH_SSU100  0xC020  /* SSU100 */
  52
  53 static const struct usb_device_id id_table[] = {
  54         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
  55         {}                      /* Terminating entry */
  56 };
  57 MODULE_DEVICE_TABLE(usb, id_table);
  58
  59 struct ssu100_port_private {
  60         spinlock_t status_lock;
  61         u8 shadowLSR;
  62         u8 shadowMSR;
  63 };
  64
  65 static inline int ssu100_control_msg(struct usb_device *dev,
  66                                      u8 request, u16 data, u16 index)
  67 {
  68         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  69                                request, 0x40, data, index,
  70                                NULL, 0, 300);
  71 }
  72
  73 static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
  74 {
  75         u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));
  76
  77         return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
  78 }
  79
  80
  81 static inline int ssu100_getdevice(struct usb_device *dev, u8 *data)
  82 {
  83         int ret;
  84
  85         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  86                               QT_SET_GET_DEVICE, 0xc0, 0, 0,
  87                               data, 3, 300);
  88         if (ret < 3) {
  89                 if (ret >= 0)
  90                         ret = -EIO;
  91         }
  92
  93         return ret;
  94 }
  95
  96 static inline int ssu100_getregister(struct usb_device *dev,
  97                                      unsigned short uart,
  98                                      unsigned short reg,
  99                                      u8 *data)
 100 {
 101         int ret;
 102
 103         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 104                               QT_SET_GET_REGISTER, 0xc0, reg,
 105                               uart, data, sizeof(*data), 300);
 106         if (ret < sizeof(*data)) {
 107                 if (ret >= 0)
 108                         ret = -EIO;
 109         }
 110
 111         return ret;
 112 }
 113
 114
 115 static inline int ssu100_setregister(struct usb_device *dev,
 116                                      unsigned short uart,
 117                                      unsigned short reg,
 118                                      u16 data)
 119 {
 120         u16 value = (data << 8) | reg;
 121
 122         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 123                                QT_SET_GET_REGISTER, 0x40, value, uart,
 124                                NULL, 0, 300);
 125
 126 }
 127
 128 #define set_mctrl(dev, set)             update_mctrl((dev), (set), 0)
 129 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
 130
 131 /* these do not deal with device that have more than 1 port */
 132 static inline int update_mctrl(struct usb_device *dev, unsigned int set,
 133                                unsigned int clear)
 134 {
 135         unsigned urb_value;
 136         int result;
 137
 138         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 139                 dev_dbg(&dev->dev, "%s - DTR|RTS not being set|cleared\n", __func__);
 140                 return 0;       /* no change */
 141         }
 142
 143         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 144         urb_value = 0;
 145         if (set & TIOCM_DTR)
 146                 urb_value |= UART_MCR_DTR;
 147         if (set & TIOCM_RTS)
 148                 urb_value |= UART_MCR_RTS;
 149
 150         result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
 151         if (result < 0)
 152                 dev_dbg(&dev->dev, "%s Error from MODEM_CTRL urb\n", __func__);
 153
 154         return result;
 155 }
 156
 157 static int ssu100_initdevice(struct usb_device *dev)
 158 {
 159         u8 *data;
 160         int result = 0;
 161
 162         data = kzalloc(3, GFP_KERNEL);
 163         if (!data)
 164                 return -ENOMEM;
 165
 166         result = ssu100_getdevice(dev, data);
 167         if (result < 0) {
 168                 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result);
 169                 goto out;
 170         }
 171
 172         data[1] &= ~FULLPWRBIT;
 173
 174         result = ssu100_setdevice(dev, data);
 175         if (result < 0) {
 176                 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result);
 177                 goto out;
 178         }
 179
 180         result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
 181         if (result < 0) {
 182                 dev_dbg(&dev->dev, "%s - set prebuffer level failed %i\n", __func__, result);
 183                 goto out;
 184         }
 185
 186         result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
 187         if (result < 0) {
 188                 dev_dbg(&dev->dev, "%s - set ATFprebuffer level failed %i\n", __func__, result);
 189                 goto out;
 190         }
 191
 192         result = ssu100_getdevice(dev, data);
 193         if (result < 0) {
 194                 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result);
 195                 goto out;
 196         }
 197
 198         data[0] &= ~(RR_BITS | DUPMODE_BITS);
 199         data[0] |= CLKS_X4;
 200         data[1] &= ~(LOOPMODE_BITS);
 201         data[1] |= RS232_MODE;
 202
 203         result = ssu100_setdevice(dev, data);
 204         if (result < 0) {
 205                 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result);
 206                 goto out;
 207         }
 208
 209 out:    kfree(data);
 210         return result;
 211
 212 }
 213
 214
 215 static void ssu100_set_termios(struct tty_struct *tty,
 216                                struct usb_serial_port *port,
 217                                struct ktermios *old_termios)
 218 {
 219         struct usb_device *dev = port->serial->dev;
 220         struct ktermios *termios = &tty->termios;
 221         u16 baud, divisor, remainder;
 222         unsigned int cflag = termios->c_cflag;
 223         u16 urb_value = 0; /* will hold the new flags */
 224         int result;
 225
 226         if (cflag & PARENB) {
 227                 if (cflag & PARODD)
 228                         urb_value |= UART_LCR_PARITY;
 229                 else
 230                         urb_value |= SERIAL_EVEN_PARITY;
 231         }
 232
 233         switch (cflag & CSIZE) {
 234         case CS5:
 235                 urb_value |= UART_LCR_WLEN5;
 236                 break;
 237         case CS6:
 238                 urb_value |= UART_LCR_WLEN6;
 239                 break;
 240         case CS7:
 241                 urb_value |= UART_LCR_WLEN7;
 242                 break;
 243         default:
 244         case CS8:
 245                 urb_value |= UART_LCR_WLEN8;
 246                 break;
 247         }
 248
 249         baud = tty_get_baud_rate(tty);
 250         if (!baud)
 251                 baud = 9600;
 252
 253         dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud);
 254
 255
 256         divisor = MAX_BAUD_RATE / baud;
 257         remainder = MAX_BAUD_RATE % baud;
 258         if (((remainder * 2) >= baud) && (baud != 110))
 259                 divisor++;
 260
 261         urb_value = urb_value << 8;
 262
 263         result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
 264         if (result < 0)
 265                 dev_dbg(&port->dev, "%s - set uart failed\n", __func__);
 266
 267         if (cflag & CRTSCTS)
 268                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 269                                             SERIAL_CRTSCTS, 0);
 270         else
 271                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 272                                             0, 0);
 273         if (result < 0)
 274                 dev_dbg(&port->dev, "%s - set HW flow control failed\n", __func__);
 275
 276         if (I_IXOFF(tty) || I_IXON(tty)) {
 277                 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));
 278
 279                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 280                                             x, 0);
 281         } else
 282                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 283                                             0, 0);
 284
 285         if (result < 0)
 286                 dev_dbg(&port->dev, "%s - set SW flow control failed\n", __func__);
 287
 288 }
 289
 290
 291 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
 292 {
 293         struct usb_device *dev = port->serial->dev;
 294         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 295         u8 *data;
 296         int result;
 297         unsigned long flags;
 298
 299         data = kzalloc(2, GFP_KERNEL);
 300         if (!data)
 301                 return -ENOMEM;
 302
 303         result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 304                                  QT_OPEN_CLOSE_CHANNEL,
 305                                  QT_TRANSFER_IN, 0x01,
 306                                  0, data, 2, 300);
 307         if (result < 2) {
 308                 dev_dbg(&port->dev, "%s - open failed %i\n", __func__, result);
 309                 if (result >= 0)
 310                         result = -EIO;
 311                 kfree(data);
 312                 return result;
 313         }
 314
 315         spin_lock_irqsave(&priv->status_lock, flags);
 316         priv->shadowLSR = data[0];
 317         priv->shadowMSR = data[1];
 318         spin_unlock_irqrestore(&priv->status_lock, flags);
 319
 320         kfree(data);
 321
 322 /* set to 9600 */
 323         result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
 324         if (result < 0)
 325                 dev_dbg(&port->dev, "%s - set uart failed\n", __func__);
 326
 327         if (tty)
 328                 ssu100_set_termios(tty, port, &tty->termios);
 329
 330         return usb_serial_generic_open(tty, port);
 331 }
 332
 333 static int get_serial_info(struct usb_serial_port *port,
 334                            struct serial_struct __user *retinfo)
 335 {
 336         struct serial_struct tmp;
 337
 338         memset(&tmp, 0, sizeof(tmp));
 339         tmp.line                = port->minor;
 340         tmp.port                = 0;
 341         tmp.irq                 = 0;
 342         tmp.xmit_fifo_size      = port->bulk_out_size;
 343         tmp.baud_base           = 9600;
 344         tmp.close_delay         = 5*HZ;
 345         tmp.closing_wait        = 30*HZ;
 346
 347         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 348                 return -EFAULT;
 349         return 0;
 350 }
 351
 352 static int ssu100_ioctl(struct tty_struct *tty,
 353                     unsigned int cmd, unsigned long arg)
 354 {
 355         struct usb_serial_port *port = tty->driver_data;
 356
 357         switch (cmd) {
 358         case TIOCGSERIAL:
 359                 return get_serial_info(port,
 360                                        (struct serial_struct __user *) arg);
 361         default:
 362                 break;
 363         }
 364
 365         return -ENOIOCTLCMD;
 366 }
 367
 368 static int ssu100_attach(struct usb_serial *serial)
 369 {
 370         return ssu100_initdevice(serial->dev);
 371 }
 372
 373 static int ssu100_port_probe(struct usb_serial_port *port)
 374 {
 375         struct ssu100_port_private *priv;
 376
 377         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 378         if (!priv)
 379                 return -ENOMEM;
 380
 381         spin_lock_init(&priv->status_lock);
 382
 383         usb_set_serial_port_data(port, priv);
 384
 385         return 0;
 386 }
 387
 388 static int ssu100_port_remove(struct usb_serial_port *port)
 389 {
 390         struct ssu100_port_private *priv;
 391
 392         priv = usb_get_serial_port_data(port);
 393         kfree(priv);
 394
 395         return 0;
 396 }
 397
 398 static int ssu100_tiocmget(struct tty_struct *tty)
 399 {
 400         struct usb_serial_port *port = tty->driver_data;
 401         struct usb_device *dev = port->serial->dev;
 402         u8 *d;
 403         int r;
 404
 405         d = kzalloc(2, GFP_KERNEL);
 406         if (!d)
 407                 return -ENOMEM;
 408
 409         r = ssu100_getregister(dev, 0, UART_MCR, d);
 410         if (r < 0)
 411                 goto mget_out;
 412
 413         r = ssu100_getregister(dev, 0, UART_MSR, d+1);
 414         if (r < 0)
 415                 goto mget_out;
 416
 417         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 418                 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 419                 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 420                 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 421                 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 422                 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 423
 424 mget_out:
 425         kfree(d);
 426         return r;
 427 }
 428
 429 static int ssu100_tiocmset(struct tty_struct *tty,
 430                            unsigned int set, unsigned int clear)
 431 {
 432         struct usb_serial_port *port = tty->driver_data;
 433         struct usb_device *dev = port->serial->dev;
 434
 435         return update_mctrl(dev, set, clear);
 436 }
 437
 438 static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
 439 {
 440         struct usb_device *dev = port->serial->dev;
 441
 442         /* Disable flow control */
 443         if (!on) {
 444                 if (ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
 445                         dev_err(&port->dev, "error from flowcontrol urb\n");
 446         }
 447         /* drop RTS and DTR */
 448         if (on)
 449                 set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 450         else
 451                 clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 452 }
 453
 454 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
 455 {
 456         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 457         unsigned long flags;
 458
 459         spin_lock_irqsave(&priv->status_lock, flags);
 460         priv->shadowMSR = msr;
 461         spin_unlock_irqrestore(&priv->status_lock, flags);
 462
 463         if (msr & UART_MSR_ANY_DELTA) {
 464                 /* update input line counters */
 465                 if (msr & UART_MSR_DCTS)
 466                         port->icount.cts++;
 467                 if (msr & UART_MSR_DDSR)
 468                         port->icount.dsr++;
 469                 if (msr & UART_MSR_DDCD)
 470                         port->icount.dcd++;
 471                 if (msr & UART_MSR_TERI)
 472                         port->icount.rng++;
 473                 wake_up_interruptible(&port->port.delta_msr_wait);
 474         }
 475 }
 476
 477 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
 478                               char *tty_flag)
 479 {
 480         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 481         unsigned long flags;
 482
 483         spin_lock_irqsave(&priv->status_lock, flags);
 484         priv->shadowLSR = lsr;
 485         spin_unlock_irqrestore(&priv->status_lock, flags);
 486
 487         *tty_flag = TTY_NORMAL;
 488         if (lsr & UART_LSR_BRK_ERROR_BITS) {
 489                 /* we always want to update icount, but we only want to
 490                  * update tty_flag for one case */
 491                 if (lsr & UART_LSR_BI) {
 492                         port->icount.brk++;
 493                         *tty_flag = TTY_BREAK;
 494                         usb_serial_handle_break(port);
 495                 }
 496                 if (lsr & UART_LSR_PE) {
 497                         port->icount.parity++;
 498                         if (*tty_flag == TTY_NORMAL)
 499                                 *tty_flag = TTY_PARITY;
 500                 }
 501                 if (lsr & UART_LSR_FE) {
 502                         port->icount.frame++;
 503                         if (*tty_flag == TTY_NORMAL)
 504                                 *tty_flag = TTY_FRAME;
 505                 }
 506                 if (lsr & UART_LSR_OE) {
 507                         port->icount.overrun++;
 508                         tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 509                 }
 510         }
 511
 512 }
 513
 514 static void ssu100_process_read_urb(struct urb *urb)
 515 {
 516         struct usb_serial_port *port = urb->context;
 517         char *packet = (char *)urb->transfer_buffer;
 518         char flag = TTY_NORMAL;
 519         u32 len = urb->actual_length;
 520         int i;
 521         char *ch;
 522
 523         if ((len >= 4) &&
 524             (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
 525             ((packet[2] == 0x00) || (packet[2] == 0x01))) {
 526                 if (packet[2] == 0x00)
 527                         ssu100_update_lsr(port, packet[3], &flag);
 528                 if (packet[2] == 0x01)
 529                         ssu100_update_msr(port, packet[3]);
 530
 531                 len -= 4;
 532                 ch = packet + 4;
 533         } else
 534                 ch = packet;
 535
 536         if (!len)
 537                 return; /* status only */
 538
 539         if (port->port.console && port->sysrq) {
 540                 for (i = 0; i < len; i++, ch++) {
 541                         if (!usb_serial_handle_sysrq_char(port, *ch))
 542                                 tty_insert_flip_char(&port->port, *ch, flag);
 543                 }
 544         } else
 545                 tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len);
 546
 547         tty_flip_buffer_push(&port->port);
 548 }
 549
 550 static struct usb_serial_driver ssu100_device = {
 551         .driver = {
 552                 .owner = THIS_MODULE,
 553                 .name = "ssu100",
 554         },
 555         .description         = DRIVER_DESC,
 556         .id_table            = id_table,
 557         .num_ports           = 1,
 558         .open                = ssu100_open,
 559         .attach              = ssu100_attach,
 560         .port_probe          = ssu100_port_probe,
 561         .port_remove         = ssu100_port_remove,
 562         .dtr_rts             = ssu100_dtr_rts,
 563         .process_read_urb    = ssu100_process_read_urb,
 564         .tiocmget            = ssu100_tiocmget,
 565         .tiocmset            = ssu100_tiocmset,
 566         .tiocmiwait          = usb_serial_generic_tiocmiwait,
 567         .get_icount          = usb_serial_generic_get_icount,
 568         .ioctl               = ssu100_ioctl,
 569         .set_termios         = ssu100_set_termios,
 570 };
 571
 572 static struct usb_serial_driver * const serial_drivers[] = {
 573         &ssu100_device, NULL
 574 };
 575
 576 module_usb_serial_driver(serial_drivers, id_table);
 577
 578 MODULE_DESCRIPTION(DRIVER_DESC);
 579 MODULE_LICENSE("GPL");