kernel/drivers/usb/serial/kl5kusb105.c

   1 /*
   2  * KLSI KL5KUSB105 chip RS232 converter driver
   3  *
   4  *   Copyright (C) 2010 Johan Hovold <jhovold@gmail.com>
   5  *   Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  * All information about the device was acquired using SniffUSB ans snoopUSB
  13  * on Windows98.
  14  * It was written out of frustration with the PalmConnect USB Serial adapter
  15  * sold by Palm Inc.
  16  * Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
  17  * information that was not already available.
  18  *
  19  * It seems that KLSI bought some silicon-design information from ScanLogic,
  20  * whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
  21  * KLSI has firmware available for their devices; it is probable that the
  22  * firmware differs from that used by KLSI in their products. If you have an
  23  * original KLSI device and can provide some information on it, I would be
  24  * most interested in adding support for it here. If you have any information
  25  * on the protocol used (or find errors in my reverse-engineered stuff), please
  26  * let me know.
  27  *
  28  * The code was only tested with a PalmConnect USB adapter; if you
  29  * are adventurous, try it with any KLSI-based device and let me know how it
  30  * breaks so that I can fix it!
  31  */
  32
  33 /* TODO:
  34  *      check modem line signals
  35  *      implement handshaking or decide that we do not support it
  36  */
  37
  38 #include <linux/kernel.h>
  39 #include <linux/errno.h>
  40 #include <linux/slab.h>
  41 #include <linux/tty.h>
  42 #include <linux/tty_driver.h>
  43 #include <linux/tty_flip.h>
  44 #include <linux/module.h>
  45 #include <linux/uaccess.h>
  46 #include <asm/unaligned.h>
  47 #include <linux/usb.h>
  48 #include <linux/usb/serial.h>
  49 #include "kl5kusb105.h"
  50
  51 #define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>, Johan Hovold <jhovold@gmail.com>"
  52 #define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
  53
  54
  55 /*
  56  * Function prototypes
  57  */
  58 static int klsi_105_port_probe(struct usb_serial_port *port);
  59 static int klsi_105_port_remove(struct usb_serial_port *port);
  60 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port);
  61 static void klsi_105_close(struct usb_serial_port *port);
  62 static void klsi_105_set_termios(struct tty_struct *tty,
  63                         struct usb_serial_port *port, struct ktermios *old);
  64 static int  klsi_105_tiocmget(struct tty_struct *tty);
  65 static void klsi_105_process_read_urb(struct urb *urb);
  66 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
  67                                                 void *dest, size_t size);
  68
  69 /*
  70  * All of the device info needed for the KLSI converters.
  71  */
  72 static const struct usb_device_id id_table[] = {
  73         { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
  74         { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
  75         { }             /* Terminating entry */
  76 };
  77
  78 MODULE_DEVICE_TABLE(usb, id_table);
  79
  80 static struct usb_serial_driver kl5kusb105d_device = {
  81         .driver = {
  82                 .owner =        THIS_MODULE,
  83                 .name =         "kl5kusb105d",
  84         },
  85         .description =          "KL5KUSB105D / PalmConnect",
  86         .id_table =             id_table,
  87         .num_ports =            1,
  88         .bulk_out_size =        64,
  89         .open =                 klsi_105_open,
  90         .close =                klsi_105_close,
  91         .set_termios =          klsi_105_set_termios,
  92         /*.break_ctl =          klsi_105_break_ctl,*/
  93         .tiocmget =             klsi_105_tiocmget,
  94         .port_probe =           klsi_105_port_probe,
  95         .port_remove =          klsi_105_port_remove,
  96         .throttle =             usb_serial_generic_throttle,
  97         .unthrottle =           usb_serial_generic_unthrottle,
  98         .process_read_urb =     klsi_105_process_read_urb,
  99         .prepare_write_buffer = klsi_105_prepare_write_buffer,
 100 };
 101
 102 static struct usb_serial_driver * const serial_drivers[] = {
 103         &kl5kusb105d_device, NULL
 104 };
 105
 106 struct klsi_105_port_settings {
 107         __u8    pktlen;         /* always 5, it seems */
 108         __u8    baudrate;
 109         __u8    databits;
 110         __u8    unknown1;
 111         __u8    unknown2;
 112 } __attribute__ ((packed));
 113
 114 struct klsi_105_private {
 115         struct klsi_105_port_settings   cfg;
 116         struct ktermios                 termios;
 117         unsigned long                   line_state; /* modem line settings */
 118         spinlock_t                      lock;
 119 };
 120
 121
 122 /*
 123  * Handle vendor specific USB requests
 124  */
 125
 126
 127 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 128
 129 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 130                                       struct klsi_105_port_settings *settings)
 131 {
 132         int rc;
 133
 134         rc = usb_control_msg(port->serial->dev,
 135                         usb_sndctrlpipe(port->serial->dev, 0),
 136                         KL5KUSB105A_SIO_SET_DATA,
 137                         USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 138                         0, /* value */
 139                         0, /* index */
 140                         settings,
 141                         sizeof(struct klsi_105_port_settings),
 142                         KLSI_TIMEOUT);
 143         if (rc < 0)
 144                 dev_err(&port->dev,
 145                         "Change port settings failed (error = %d)\n", rc);
 146         dev_info(&port->serial->dev->dev,
 147                  "%d byte block, baudrate %x, databits %d, u1 %d, u2 %d\n",
 148                  settings->pktlen, settings->baudrate, settings->databits,
 149                  settings->unknown1, settings->unknown2);
 150         return rc;
 151 }
 152
 153 /* translate a 16-bit status value from the device to linux's TIO bits */
 154 static unsigned long klsi_105_status2linestate(const __u16 status)
 155 {
 156         unsigned long res = 0;
 157
 158         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 159               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 160               ;
 161
 162         return res;
 163 }
 164
 165 /*
 166  * Read line control via vendor command and return result through
 167  * *line_state_p
 168  */
 169 /* It seems that the status buffer has always only 2 bytes length */
 170 #define KLSI_STATUSBUF_LEN      2
 171 static int klsi_105_get_line_state(struct usb_serial_port *port,
 172                                    unsigned long *line_state_p)
 173 {
 174         int rc;
 175         u8 *status_buf;
 176         __u16 status;
 177
 178         dev_info(&port->serial->dev->dev, "sending SIO Poll request\n");
 179
 180         status_buf = kmalloc(KLSI_STATUSBUF_LEN, GFP_KERNEL);
 181         if (!status_buf)
 182                 return -ENOMEM;
 183
 184         status_buf[0] = 0xff;
 185         status_buf[1] = 0xff;
 186         rc = usb_control_msg(port->serial->dev,
 187                              usb_rcvctrlpipe(port->serial->dev, 0),
 188                              KL5KUSB105A_SIO_POLL,
 189                              USB_TYPE_VENDOR | USB_DIR_IN,
 190                              0, /* value */
 191                              0, /* index */
 192                              status_buf, KLSI_STATUSBUF_LEN,
 193                              10000
 194                              );
 195         if (rc < 0)
 196                 dev_err(&port->dev, "Reading line status failed (error = %d)\n",
 197                         rc);
 198         else {
 199                 status = get_unaligned_le16(status_buf);
 200
 201                 dev_info(&port->serial->dev->dev, "read status %x %x\n",
 202                          status_buf[0], status_buf[1]);
 203
 204                 *line_state_p = klsi_105_status2linestate(status);
 205         }
 206
 207         kfree(status_buf);
 208         return rc;
 209 }
 210
 211
 212 /*
 213  * Driver's tty interface functions
 214  */
 215
 216 static int klsi_105_port_probe(struct usb_serial_port *port)
 217 {
 218         struct klsi_105_private *priv;
 219
 220         priv = kmalloc(sizeof(*priv), GFP_KERNEL);
 221         if (!priv)
 222                 return -ENOMEM;
 223
 224         /* set initial values for control structures */
 225         priv->cfg.pktlen    = 5;
 226         priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 227         priv->cfg.databits  = kl5kusb105a_dtb_8;
 228         priv->cfg.unknown1  = 0;
 229         priv->cfg.unknown2  = 1;
 230
 231         priv->line_state    = 0;
 232
 233         spin_lock_init(&priv->lock);
 234
 235         /* priv->termios is left uninitialized until port opening */
 236
 237         usb_set_serial_port_data(port, priv);
 238
 239         return 0;
 240 }
 241
 242 static int klsi_105_port_remove(struct usb_serial_port *port)
 243 {
 244         struct klsi_105_private *priv;
 245
 246         priv = usb_get_serial_port_data(port);
 247         kfree(priv);
 248
 249         return 0;
 250 }
 251
 252 static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
 253 {
 254         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 255         int retval = 0;
 256         int rc;
 257         int i;
 258         unsigned long line_state;
 259         struct klsi_105_port_settings *cfg;
 260         unsigned long flags;
 261
 262         /* Do a defined restart:
 263          * Set up sane default baud rate and send the 'READ_ON'
 264          * vendor command.
 265          * FIXME: set modem line control (how?)
 266          * Then read the modem line control and store values in
 267          * priv->line_state.
 268          */
 269         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 270         if (!cfg)
 271                 return -ENOMEM;
 272
 273         cfg->pktlen   = 5;
 274         cfg->baudrate = kl5kusb105a_sio_b9600;
 275         cfg->databits = kl5kusb105a_dtb_8;
 276         cfg->unknown1 = 0;
 277         cfg->unknown2 = 1;
 278         klsi_105_chg_port_settings(port, cfg);
 279
 280         /* set up termios structure */
 281         spin_lock_irqsave(&priv->lock, flags);
 282         priv->termios.c_iflag = tty->termios.c_iflag;
 283         priv->termios.c_oflag = tty->termios.c_oflag;
 284         priv->termios.c_cflag = tty->termios.c_cflag;
 285         priv->termios.c_lflag = tty->termios.c_lflag;
 286         for (i = 0; i < NCCS; i++)
 287                 priv->termios.c_cc[i] = tty->termios.c_cc[i];
 288         priv->cfg.pktlen   = cfg->pktlen;
 289         priv->cfg.baudrate = cfg->baudrate;
 290         priv->cfg.databits = cfg->databits;
 291         priv->cfg.unknown1 = cfg->unknown1;
 292         priv->cfg.unknown2 = cfg->unknown2;
 293         spin_unlock_irqrestore(&priv->lock, flags);
 294
 295         /* READ_ON and urb submission */
 296         rc = usb_serial_generic_open(tty, port);
 297         if (rc) {
 298                 retval = rc;
 299                 goto exit;
 300         }
 301
 302         rc = usb_control_msg(port->serial->dev,
 303                              usb_sndctrlpipe(port->serial->dev, 0),
 304                              KL5KUSB105A_SIO_CONFIGURE,
 305                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 306                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 307                              0, /* index */
 308                              NULL,
 309                              0,
 310                              KLSI_TIMEOUT);
 311         if (rc < 0) {
 312                 dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
 313                 retval = rc;
 314         } else
 315                 dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
 316
 317         rc = klsi_105_get_line_state(port, &line_state);
 318         if (rc >= 0) {
 319                 spin_lock_irqsave(&priv->lock, flags);
 320                 priv->line_state = line_state;
 321                 spin_unlock_irqrestore(&priv->lock, flags);
 322                 dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
 323                 retval = 0;
 324         } else
 325                 retval = rc;
 326
 327 exit:
 328         kfree(cfg);
 329         return retval;
 330 }
 331
 332 static void klsi_105_close(struct usb_serial_port *port)
 333 {
 334         int rc;
 335
 336         /* send READ_OFF */
 337         rc = usb_control_msg(port->serial->dev,
 338                              usb_sndctrlpipe(port->serial->dev, 0),
 339                              KL5KUSB105A_SIO_CONFIGURE,
 340                              USB_TYPE_VENDOR | USB_DIR_OUT,
 341                              KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 342                              0, /* index */
 343                              NULL, 0,
 344                              KLSI_TIMEOUT);
 345         if (rc < 0)
 346                 dev_err(&port->dev, "failed to disable read: %d\n", rc);
 347
 348         /* shutdown our bulk reads and writes */
 349         usb_serial_generic_close(port);
 350 }
 351
 352 /* We need to write a complete 64-byte data block and encode the
 353  * number actually sent in the first double-byte, LSB-order. That
 354  * leaves at most 62 bytes of payload.
 355  */
 356 #define KLSI_HDR_LEN            2
 357 static int klsi_105_prepare_write_buffer(struct usb_serial_port *port,
 358                                                 void *dest, size_t size)
 359 {
 360         unsigned char *buf = dest;
 361         int count;
 362
 363         count = kfifo_out_locked(&port->write_fifo, buf + KLSI_HDR_LEN, size,
 364                                                                 &port->lock);
 365         put_unaligned_le16(count, buf);
 366
 367         return count + KLSI_HDR_LEN;
 368 }
 369
 370 /* The data received is preceded by a length double-byte in LSB-first order.
 371  */
 372 static void klsi_105_process_read_urb(struct urb *urb)
 373 {
 374         struct usb_serial_port *port = urb->context;
 375         unsigned char *data = urb->transfer_buffer;
 376         unsigned len;
 377
 378         /* empty urbs seem to happen, we ignore them */
 379         if (!urb->actual_length)
 380                 return;
 381
 382         if (urb->actual_length <= KLSI_HDR_LEN) {
 383                 dev_dbg(&port->dev, "%s - malformed packet\n", __func__);
 384                 return;
 385         }
 386
 387         len = get_unaligned_le16(data);
 388         if (len > urb->actual_length - KLSI_HDR_LEN) {
 389                 dev_dbg(&port->dev, "%s - packet length mismatch\n", __func__);
 390                 len = urb->actual_length - KLSI_HDR_LEN;
 391         }
 392
 393         tty_insert_flip_string(&port->port, data + KLSI_HDR_LEN, len);
 394         tty_flip_buffer_push(&port->port);
 395 }
 396
 397 static void klsi_105_set_termios(struct tty_struct *tty,
 398                                  struct usb_serial_port *port,
 399                                  struct ktermios *old_termios)
 400 {
 401         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 402         struct device *dev = &port->dev;
 403         unsigned int iflag = tty->termios.c_iflag;
 404         unsigned int old_iflag = old_termios->c_iflag;
 405         unsigned int cflag = tty->termios.c_cflag;
 406         unsigned int old_cflag = old_termios->c_cflag;
 407         struct klsi_105_port_settings *cfg;
 408         unsigned long flags;
 409         speed_t baud;
 410
 411         cfg = kmalloc(sizeof(*cfg), GFP_KERNEL);
 412         if (!cfg)
 413                 return;
 414
 415         /* lock while we are modifying the settings */
 416         spin_lock_irqsave(&priv->lock, flags);
 417
 418         /*
 419          * Update baud rate
 420          */
 421         baud = tty_get_baud_rate(tty);
 422
 423         if ((cflag & CBAUD) != (old_cflag & CBAUD)) {
 424                 /* reassert DTR and (maybe) RTS on transition from B0 */
 425                 if ((old_cflag & CBAUD) == B0) {
 426                         dev_dbg(dev, "%s: baud was B0\n", __func__);
 427 #if 0
 428                         priv->control_state |= TIOCM_DTR;
 429                         /* don't set RTS if using hardware flow control */
 430                         if (!(old_cflag & CRTSCTS))
 431                                 priv->control_state |= TIOCM_RTS;
 432                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 433 #endif
 434                 }
 435         }
 436         switch (baud) {
 437         case 0: /* handled below */
 438                 break;
 439         case 1200:
 440                 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 441                 break;
 442         case 2400:
 443                 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 444                 break;
 445         case 4800:
 446                 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 447                 break;
 448         case 9600:
 449                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 450                 break;
 451         case 19200:
 452                 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 453                 break;
 454         case 38400:
 455                 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 456                 break;
 457         case 57600:
 458                 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 459                 break;
 460         case 115200:
 461                 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 462                 break;
 463         default:
 464                 dev_dbg(dev, "unsupported baudrate, using 9600\n");
 465                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 466                 baud = 9600;
 467                 break;
 468         }
 469         if ((cflag & CBAUD) == B0) {
 470                 dev_dbg(dev, "%s: baud is B0\n", __func__);
 471                 /* Drop RTS and DTR */
 472                 /* maybe this should be simulated by sending read
 473                  * disable and read enable messages?
 474                  */
 475                 ;
 476 #if 0
 477                 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 478                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 479 #endif
 480         }
 481         tty_encode_baud_rate(tty, baud, baud);
 482
 483         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 484                 /* set the number of data bits */
 485                 switch (cflag & CSIZE) {
 486                 case CS5:
 487                         dev_dbg(dev, "%s - 5 bits/byte not supported\n", __func__);
 488                         spin_unlock_irqrestore(&priv->lock, flags);
 489                         goto err;
 490                 case CS6:
 491                         dev_dbg(dev, "%s - 6 bits/byte not supported\n", __func__);
 492                         spin_unlock_irqrestore(&priv->lock, flags);
 493                         goto err;
 494                 case CS7:
 495                         priv->cfg.databits = kl5kusb105a_dtb_7;
 496                         break;
 497                 case CS8:
 498                         priv->cfg.databits = kl5kusb105a_dtb_8;
 499                         break;
 500                 default:
 501                         dev_err(dev, "CSIZE was not CS5-CS8, using default of 8\n");
 502                         priv->cfg.databits = kl5kusb105a_dtb_8;
 503                         break;
 504                 }
 505         }
 506
 507         /*
 508          * Update line control register (LCR)
 509          */
 510         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 511             || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 512                 /* Not currently supported */
 513                 tty->termios.c_cflag &= ~(PARENB|PARODD|CSTOPB);
 514 #if 0
 515                 priv->last_lcr = 0;
 516
 517                 /* set the parity */
 518                 if (cflag & PARENB)
 519                         priv->last_lcr |= (cflag & PARODD) ?
 520                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 521                 else
 522                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 523
 524                 /* set the number of stop bits */
 525                 priv->last_lcr |= (cflag & CSTOPB) ?
 526                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 527
 528                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 529 #endif
 530                 ;
 531         }
 532         /*
 533          * Set flow control: well, I do not really now how to handle DTR/RTS.
 534          * Just do what we have seen with SniffUSB on Win98.
 535          */
 536         if ((iflag & IXOFF) != (old_iflag & IXOFF)
 537             || (iflag & IXON) != (old_iflag & IXON)
 538             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 539                 /* Not currently supported */
 540                 tty->termios.c_cflag &= ~CRTSCTS;
 541                 /* Drop DTR/RTS if no flow control otherwise assert */
 542 #if 0
 543                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
 544                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 545                 else
 546                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 547                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 548 #endif
 549                 ;
 550         }
 551         memcpy(cfg, &priv->cfg, sizeof(*cfg));
 552         spin_unlock_irqrestore(&priv->lock, flags);
 553
 554         /* now commit changes to device */
 555         klsi_105_chg_port_settings(port, cfg);
 556 err:
 557         kfree(cfg);
 558 }
 559
 560 #if 0
 561 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
 562 {
 563         struct usb_serial_port *port = tty->driver_data;
 564         struct usb_serial *serial = port->serial;
 565         struct mct_u232_private *priv =
 566                                 (struct mct_u232_private *)port->private;
 567         unsigned char lcr = priv->last_lcr;
 568
 569         dev_dbg(&port->dev, "%s - state=%d\n", __func__, break_state);
 570
 571         /* LOCKING */
 572         if (break_state)
 573                 lcr |= MCT_U232_SET_BREAK;
 574
 575         mct_u232_set_line_ctrl(serial, lcr);
 576 }
 577 #endif
 578
 579 static int klsi_105_tiocmget(struct tty_struct *tty)
 580 {
 581         struct usb_serial_port *port = tty->driver_data;
 582         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 583         unsigned long flags;
 584         int rc;
 585         unsigned long line_state;
 586
 587         rc = klsi_105_get_line_state(port, &line_state);
 588         if (rc < 0) {
 589                 dev_err(&port->dev,
 590                         "Reading line control failed (error = %d)\n", rc);
 591                 /* better return value? EAGAIN? */
 592                 return rc;
 593         }
 594
 595         spin_lock_irqsave(&priv->lock, flags);
 596         priv->line_state = line_state;
 597         spin_unlock_irqrestore(&priv->lock, flags);
 598         dev_dbg(&port->dev, "%s - read line state 0x%lx\n", __func__, line_state);
 599         return (int)line_state;
 600 }
 601
 602 module_usb_serial_driver(serial_drivers, id_table);
 603
 604 MODULE_AUTHOR(DRIVER_AUTHOR);
 605 MODULE_DESCRIPTION(DRIVER_DESC);
 606 MODULE_LICENSE("GPL");