drivers/usb/serial/ssu100.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * usb-serial driver for Quatech SSU-100
   4  *
   5  * based on ftdi_sio.c and the original serqt_usb.c from Quatech
   6  *
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/slab.h>
  11 #include <linux/tty.h>
  12 #include <linux/tty_driver.h>
  13 #include <linux/tty_flip.h>
  14 #include <linux/module.h>
  15 #include <linux/serial.h>
  16 #include <linux/usb.h>
  17 #include <linux/usb/serial.h>
  18 #include <linux/serial_reg.h>
  19 #include <linux/uaccess.h>
  20
  21 #define QT_OPEN_CLOSE_CHANNEL       0xca
  22 #define QT_SET_GET_DEVICE           0xc2
  23 #define QT_SET_GET_REGISTER         0xc0
  24 #define QT_GET_SET_PREBUF_TRIG_LVL  0xcc
  25 #define QT_SET_ATF                  0xcd
  26 #define QT_GET_SET_UART             0xc1
  27 #define QT_TRANSFER_IN              0xc0
  28 #define QT_HW_FLOW_CONTROL_MASK     0xc5
  29 #define QT_SW_FLOW_CONTROL_MASK     0xc6
  30
  31 #define  SERIAL_MSR_MASK            0xf0
  32
  33 #define  SERIAL_CRTSCTS ((UART_MCR_RTS << 8) | UART_MSR_CTS)
  34
  35 #define  SERIAL_EVEN_PARITY         (UART_LCR_PARITY | UART_LCR_EPAR)
  36
  37 #define  MAX_BAUD_RATE              460800
  38
  39 #define ATC_DISABLED                0x00
  40 #define DUPMODE_BITS        0xc0
  41 #define RR_BITS             0x03
  42 #define LOOPMODE_BITS       0x41
  43 #define RS232_MODE          0x00
  44 #define RTSCTS_TO_CONNECTOR 0x40
  45 #define CLKS_X4             0x02
  46 #define FULLPWRBIT          0x00000080
  47 #define NEXT_BOARD_POWER_BIT        0x00000004
  48
  49 #define DRIVER_DESC "Quatech SSU-100 USB to Serial Driver"
  50
  51 #define USB_VENDOR_ID_QUATECH   0x061d  /* Quatech VID */
  52 #define QUATECH_SSU100  0xC020  /* SSU100 */
  53
  54 static const struct usb_device_id id_table[] = {
  55         {USB_DEVICE(USB_VENDOR_ID_QUATECH, QUATECH_SSU100)},
  56         {}                      /* Terminating entry */
  57 };
  58 MODULE_DEVICE_TABLE(usb, id_table);
  59
  60 struct ssu100_port_private {
  61         spinlock_t status_lock;
  62         u8 shadowLSR;
  63         u8 shadowMSR;
  64 };
  65
  66 static inline int ssu100_control_msg(struct usb_device *dev,
  67                                      u8 request, u16 data, u16 index)
  68 {
  69         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  70                                request, 0x40, data, index,
  71                                NULL, 0, 300);
  72 }
  73
  74 static inline int ssu100_setdevice(struct usb_device *dev, u8 *data)
  75 {
  76         u16 x = ((u16)(data[1] << 8) | (u16)(data[0]));
  77
  78         return ssu100_control_msg(dev, QT_SET_GET_DEVICE, x, 0);
  79 }
  80
  81
  82 static inline int ssu100_getdevice(struct usb_device *dev, u8 *data)
  83 {
  84         int ret;
  85
  86         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
  87                               QT_SET_GET_DEVICE, 0xc0, 0, 0,
  88                               data, 3, 300);
  89         if (ret < 3) {
  90                 if (ret >= 0)
  91                         ret = -EIO;
  92         }
  93
  94         return ret;
  95 }
  96
  97 static inline int ssu100_getregister(struct usb_device *dev,
  98                                      unsigned short uart,
  99                                      unsigned short reg,
 100                                      u8 *data)
 101 {
 102         int ret;
 103
 104         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 105                               QT_SET_GET_REGISTER, 0xc0, reg,
 106                               uart, data, sizeof(*data), 300);
 107         if (ret < (int)sizeof(*data)) {
 108                 if (ret >= 0)
 109                         ret = -EIO;
 110         }
 111
 112         return ret;
 113 }
 114
 115
 116 static inline int ssu100_setregister(struct usb_device *dev,
 117                                      unsigned short uart,
 118                                      unsigned short reg,
 119                                      u16 data)
 120 {
 121         u16 value = (data << 8) | reg;
 122
 123         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 124                                QT_SET_GET_REGISTER, 0x40, value, uart,
 125                                NULL, 0, 300);
 126
 127 }
 128
 129 #define set_mctrl(dev, set)             update_mctrl((dev), (set), 0)
 130 #define clear_mctrl(dev, clear) update_mctrl((dev), 0, (clear))
 131
 132 /* these do not deal with device that have more than 1 port */
 133 static inline int update_mctrl(struct usb_device *dev, unsigned int set,
 134                                unsigned int clear)
 135 {
 136         unsigned urb_value;
 137         int result;
 138
 139         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0) {
 140                 dev_dbg(&dev->dev, "%s - DTR|RTS not being set|cleared\n", __func__);
 141                 return 0;       /* no change */
 142         }
 143
 144         clear &= ~set;  /* 'set' takes precedence over 'clear' */
 145         urb_value = 0;
 146         if (set & TIOCM_DTR)
 147                 urb_value |= UART_MCR_DTR;
 148         if (set & TIOCM_RTS)
 149                 urb_value |= UART_MCR_RTS;
 150
 151         result = ssu100_setregister(dev, 0, UART_MCR, urb_value);
 152         if (result < 0)
 153                 dev_dbg(&dev->dev, "%s Error from MODEM_CTRL urb\n", __func__);
 154
 155         return result;
 156 }
 157
 158 static int ssu100_initdevice(struct usb_device *dev)
 159 {
 160         u8 *data;
 161         int result = 0;
 162
 163         data = kzalloc(3, GFP_KERNEL);
 164         if (!data)
 165                 return -ENOMEM;
 166
 167         result = ssu100_getdevice(dev, data);
 168         if (result < 0) {
 169                 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result);
 170                 goto out;
 171         }
 172
 173         data[1] &= ~FULLPWRBIT;
 174
 175         result = ssu100_setdevice(dev, data);
 176         if (result < 0) {
 177                 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result);
 178                 goto out;
 179         }
 180
 181         result = ssu100_control_msg(dev, QT_GET_SET_PREBUF_TRIG_LVL, 128, 0);
 182         if (result < 0) {
 183                 dev_dbg(&dev->dev, "%s - set prebuffer level failed %i\n", __func__, result);
 184                 goto out;
 185         }
 186
 187         result = ssu100_control_msg(dev, QT_SET_ATF, ATC_DISABLED, 0);
 188         if (result < 0) {
 189                 dev_dbg(&dev->dev, "%s - set ATFprebuffer level failed %i\n", __func__, result);
 190                 goto out;
 191         }
 192
 193         result = ssu100_getdevice(dev, data);
 194         if (result < 0) {
 195                 dev_dbg(&dev->dev, "%s - get_device failed %i\n", __func__, result);
 196                 goto out;
 197         }
 198
 199         data[0] &= ~(RR_BITS | DUPMODE_BITS);
 200         data[0] |= CLKS_X4;
 201         data[1] &= ~(LOOPMODE_BITS);
 202         data[1] |= RS232_MODE;
 203
 204         result = ssu100_setdevice(dev, data);
 205         if (result < 0) {
 206                 dev_dbg(&dev->dev, "%s - setdevice failed %i\n", __func__, result);
 207                 goto out;
 208         }
 209
 210 out:    kfree(data);
 211         return result;
 212
 213 }
 214
 215
 216 static void ssu100_set_termios(struct tty_struct *tty,
 217                                struct usb_serial_port *port,
 218                                struct ktermios *old_termios)
 219 {
 220         struct usb_device *dev = port->serial->dev;
 221         struct ktermios *termios = &tty->termios;
 222         u16 baud, divisor, remainder;
 223         unsigned int cflag = termios->c_cflag;
 224         u16 urb_value = 0; /* will hold the new flags */
 225         int result;
 226
 227         if (cflag & PARENB) {
 228                 if (cflag & PARODD)
 229                         urb_value |= UART_LCR_PARITY;
 230                 else
 231                         urb_value |= SERIAL_EVEN_PARITY;
 232         }
 233
 234         switch (cflag & CSIZE) {
 235         case CS5:
 236                 urb_value |= UART_LCR_WLEN5;
 237                 break;
 238         case CS6:
 239                 urb_value |= UART_LCR_WLEN6;
 240                 break;
 241         case CS7:
 242                 urb_value |= UART_LCR_WLEN7;
 243                 break;
 244         default:
 245         case CS8:
 246                 urb_value |= UART_LCR_WLEN8;
 247                 break;
 248         }
 249
 250         baud = tty_get_baud_rate(tty);
 251         if (!baud)
 252                 baud = 9600;
 253
 254         dev_dbg(&port->dev, "%s - got baud = %d\n", __func__, baud);
 255
 256
 257         divisor = MAX_BAUD_RATE / baud;
 258         remainder = MAX_BAUD_RATE % baud;
 259         if (((remainder * 2) >= baud) && (baud != 110))
 260                 divisor++;
 261
 262         urb_value = urb_value << 8;
 263
 264         result = ssu100_control_msg(dev, QT_GET_SET_UART, divisor, urb_value);
 265         if (result < 0)
 266                 dev_dbg(&port->dev, "%s - set uart failed\n", __func__);
 267
 268         if (cflag & CRTSCTS)
 269                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 270                                             SERIAL_CRTSCTS, 0);
 271         else
 272                 result = ssu100_control_msg(dev, QT_HW_FLOW_CONTROL_MASK,
 273                                             0, 0);
 274         if (result < 0)
 275                 dev_dbg(&port->dev, "%s - set HW flow control failed\n", __func__);
 276
 277         if (I_IXOFF(tty) || I_IXON(tty)) {
 278                 u16 x = ((u16)(START_CHAR(tty) << 8) | (u16)(STOP_CHAR(tty)));
 279
 280                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 281                                             x, 0);
 282         } else
 283                 result = ssu100_control_msg(dev, QT_SW_FLOW_CONTROL_MASK,
 284                                             0, 0);
 285
 286         if (result < 0)
 287                 dev_dbg(&port->dev, "%s - set SW flow control failed\n", __func__);
 288
 289 }
 290
 291
 292 static int ssu100_open(struct tty_struct *tty, struct usb_serial_port *port)
 293 {
 294         struct usb_device *dev = port->serial->dev;
 295         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 296         u8 *data;
 297         int result;
 298         unsigned long flags;
 299
 300         data = kzalloc(2, GFP_KERNEL);
 301         if (!data)
 302                 return -ENOMEM;
 303
 304         result = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 305                                  QT_OPEN_CLOSE_CHANNEL,
 306                                  QT_TRANSFER_IN, 0x01,
 307                                  0, data, 2, 300);
 308         if (result < 2) {
 309                 dev_dbg(&port->dev, "%s - open failed %i\n", __func__, result);
 310                 if (result >= 0)
 311                         result = -EIO;
 312                 kfree(data);
 313                 return result;
 314         }
 315
 316         spin_lock_irqsave(&priv->status_lock, flags);
 317         priv->shadowLSR = data[0];
 318         priv->shadowMSR = data[1];
 319         spin_unlock_irqrestore(&priv->status_lock, flags);
 320
 321         kfree(data);
 322
 323 /* set to 9600 */
 324         result = ssu100_control_msg(dev, QT_GET_SET_UART, 0x30, 0x0300);
 325         if (result < 0)
 326                 dev_dbg(&port->dev, "%s - set uart failed\n", __func__);
 327
 328         if (tty)
 329                 ssu100_set_termios(tty, port, &tty->termios);
 330
 331         return usb_serial_generic_open(tty, port);
 332 }
 333
 334 static int get_serial_info(struct usb_serial_port *port,
 335                            struct serial_struct __user *retinfo)
 336 {
 337         struct serial_struct tmp;
 338
 339         memset(&tmp, 0, sizeof(tmp));
 340         tmp.line                = port->minor;
 341         tmp.port                = 0;
 342         tmp.irq                 = 0;
 343         tmp.xmit_fifo_size      = port->bulk_out_size;
 344         tmp.baud_base           = 9600;
 345         tmp.close_delay         = 5*HZ;
 346         tmp.closing_wait        = 30*HZ;
 347
 348         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
 349                 return -EFAULT;
 350         return 0;
 351 }
 352
 353 static int ssu100_ioctl(struct tty_struct *tty,
 354                     unsigned int cmd, unsigned long arg)
 355 {
 356         struct usb_serial_port *port = tty->driver_data;
 357
 358         switch (cmd) {
 359         case TIOCGSERIAL:
 360                 return get_serial_info(port,
 361                                        (struct serial_struct __user *) arg);
 362         default:
 363                 break;
 364         }
 365
 366         return -ENOIOCTLCMD;
 367 }
 368
 369 static int ssu100_attach(struct usb_serial *serial)
 370 {
 371         return ssu100_initdevice(serial->dev);
 372 }
 373
 374 static int ssu100_port_probe(struct usb_serial_port *port)
 375 {
 376         struct ssu100_port_private *priv;
 377
 378         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 379         if (!priv)
 380                 return -ENOMEM;
 381
 382         spin_lock_init(&priv->status_lock);
 383
 384         usb_set_serial_port_data(port, priv);
 385
 386         return 0;
 387 }
 388
 389 static int ssu100_port_remove(struct usb_serial_port *port)
 390 {
 391         struct ssu100_port_private *priv;
 392
 393         priv = usb_get_serial_port_data(port);
 394         kfree(priv);
 395
 396         return 0;
 397 }
 398
 399 static int ssu100_tiocmget(struct tty_struct *tty)
 400 {
 401         struct usb_serial_port *port = tty->driver_data;
 402         struct usb_device *dev = port->serial->dev;
 403         u8 *d;
 404         int r;
 405
 406         d = kzalloc(2, GFP_KERNEL);
 407         if (!d)
 408                 return -ENOMEM;
 409
 410         r = ssu100_getregister(dev, 0, UART_MCR, d);
 411         if (r < 0)
 412                 goto mget_out;
 413
 414         r = ssu100_getregister(dev, 0, UART_MSR, d+1);
 415         if (r < 0)
 416                 goto mget_out;
 417
 418         r = (d[0] & UART_MCR_DTR ? TIOCM_DTR : 0) |
 419                 (d[0] & UART_MCR_RTS ? TIOCM_RTS : 0) |
 420                 (d[1] & UART_MSR_CTS ? TIOCM_CTS : 0) |
 421                 (d[1] & UART_MSR_DCD ? TIOCM_CAR : 0) |
 422                 (d[1] & UART_MSR_RI ? TIOCM_RI : 0) |
 423                 (d[1] & UART_MSR_DSR ? TIOCM_DSR : 0);
 424
 425 mget_out:
 426         kfree(d);
 427         return r;
 428 }
 429
 430 static int ssu100_tiocmset(struct tty_struct *tty,
 431                            unsigned int set, unsigned int clear)
 432 {
 433         struct usb_serial_port *port = tty->driver_data;
 434         struct usb_device *dev = port->serial->dev;
 435
 436         return update_mctrl(dev, set, clear);
 437 }
 438
 439 static void ssu100_dtr_rts(struct usb_serial_port *port, int on)
 440 {
 441         struct usb_device *dev = port->serial->dev;
 442
 443         /* Disable flow control */
 444         if (!on) {
 445                 if (ssu100_setregister(dev, 0, UART_MCR, 0) < 0)
 446                         dev_err(&port->dev, "error from flowcontrol urb\n");
 447         }
 448         /* drop RTS and DTR */
 449         if (on)
 450                 set_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 451         else
 452                 clear_mctrl(dev, TIOCM_DTR | TIOCM_RTS);
 453 }
 454
 455 static void ssu100_update_msr(struct usb_serial_port *port, u8 msr)
 456 {
 457         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 458         unsigned long flags;
 459
 460         spin_lock_irqsave(&priv->status_lock, flags);
 461         priv->shadowMSR = msr;
 462         spin_unlock_irqrestore(&priv->status_lock, flags);
 463
 464         if (msr & UART_MSR_ANY_DELTA) {
 465                 /* update input line counters */
 466                 if (msr & UART_MSR_DCTS)
 467                         port->icount.cts++;
 468                 if (msr & UART_MSR_DDSR)
 469                         port->icount.dsr++;
 470                 if (msr & UART_MSR_DDCD)
 471                         port->icount.dcd++;
 472                 if (msr & UART_MSR_TERI)
 473                         port->icount.rng++;
 474                 wake_up_interruptible(&port->port.delta_msr_wait);
 475         }
 476 }
 477
 478 static void ssu100_update_lsr(struct usb_serial_port *port, u8 lsr,
 479                               char *tty_flag)
 480 {
 481         struct ssu100_port_private *priv = usb_get_serial_port_data(port);
 482         unsigned long flags;
 483
 484         spin_lock_irqsave(&priv->status_lock, flags);
 485         priv->shadowLSR = lsr;
 486         spin_unlock_irqrestore(&priv->status_lock, flags);
 487
 488         *tty_flag = TTY_NORMAL;
 489         if (lsr & UART_LSR_BRK_ERROR_BITS) {
 490                 /* we always want to update icount, but we only want to
 491                  * update tty_flag for one case */
 492                 if (lsr & UART_LSR_BI) {
 493                         port->icount.brk++;
 494                         *tty_flag = TTY_BREAK;
 495                         usb_serial_handle_break(port);
 496                 }
 497                 if (lsr & UART_LSR_PE) {
 498                         port->icount.parity++;
 499                         if (*tty_flag == TTY_NORMAL)
 500                                 *tty_flag = TTY_PARITY;
 501                 }
 502                 if (lsr & UART_LSR_FE) {
 503                         port->icount.frame++;
 504                         if (*tty_flag == TTY_NORMAL)
 505                                 *tty_flag = TTY_FRAME;
 506                 }
 507                 if (lsr & UART_LSR_OE) {
 508                         port->icount.overrun++;
 509                         tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 510                 }
 511         }
 512
 513 }
 514
 515 static void ssu100_process_read_urb(struct urb *urb)
 516 {
 517         struct usb_serial_port *port = urb->context;
 518         char *packet = (char *)urb->transfer_buffer;
 519         char flag = TTY_NORMAL;
 520         u32 len = urb->actual_length;
 521         int i;
 522         char *ch;
 523
 524         if ((len >= 4) &&
 525             (packet[0] == 0x1b) && (packet[1] == 0x1b) &&
 526             ((packet[2] == 0x00) || (packet[2] == 0x01))) {
 527                 if (packet[2] == 0x00)
 528                         ssu100_update_lsr(port, packet[3], &flag);
 529                 if (packet[2] == 0x01)
 530                         ssu100_update_msr(port, packet[3]);
 531
 532                 len -= 4;
 533                 ch = packet + 4;
 534         } else
 535                 ch = packet;
 536
 537         if (!len)
 538                 return; /* status only */
 539
 540         if (port->port.console && port->sysrq) {
 541                 for (i = 0; i < len; i++, ch++) {
 542                         if (!usb_serial_handle_sysrq_char(port, *ch))
 543                                 tty_insert_flip_char(&port->port, *ch, flag);
 544                 }
 545         } else
 546                 tty_insert_flip_string_fixed_flag(&port->port, ch, flag, len);
 547
 548         tty_flip_buffer_push(&port->port);
 549 }
 550
 551 static struct usb_serial_driver ssu100_device = {
 552         .driver = {
 553                 .owner = THIS_MODULE,
 554                 .name = "ssu100",
 555         },
 556         .description         = DRIVER_DESC,
 557         .id_table            = id_table,
 558         .num_ports           = 1,
 559         .open                = ssu100_open,
 560         .attach              = ssu100_attach,
 561         .port_probe          = ssu100_port_probe,
 562         .port_remove         = ssu100_port_remove,
 563         .dtr_rts             = ssu100_dtr_rts,
 564         .process_read_urb    = ssu100_process_read_urb,
 565         .tiocmget            = ssu100_tiocmget,
 566         .tiocmset            = ssu100_tiocmset,
 567         .tiocmiwait          = usb_serial_generic_tiocmiwait,
 568         .get_icount          = usb_serial_generic_get_icount,
 569         .ioctl               = ssu100_ioctl,
 570         .set_termios         = ssu100_set_termios,
 571 };
 572
 573 static struct usb_serial_driver * const serial_drivers[] = {
 574         &ssu100_device, NULL
 575 };
 576
 577 module_usb_serial_driver(serial_drivers, id_table);
 578
 579 MODULE_DESCRIPTION(DRIVER_DESC);
 580 MODULE_LICENSE("GPL v2");