git.oblomov.eu Git - linux-2.6/blob - drivers/usb/serial/kl5kusb105.c

   1 /*
   2  * KLSI KL5KUSB105 chip RS232 converter driver
   3  *
   4  *   Copyright (C) 2001 Utz-Uwe Haus <haus@uuhaus.de>
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  * All information about the device was acquired using SniffUSB ans snoopUSB
  12  * on Windows98.
  13  * It was written out of frustration with the PalmConnect USB Serial adapter
  14  * sold by Palm Inc.
  15  * Neither Palm, nor their contractor (MCCI) or their supplier (KLSI) provided
  16  * information that was not already available.
  17  *
  18  * It seems that KLSI bought some silicon-design information from ScanLogic,
  19  * whose SL11R processor is at the core of the KL5KUSB chipset from KLSI.
  20  * KLSI has firmware available for their devices; it is probable that the
  21  * firmware differs from that used by KLSI in their products. If you have an
  22  * original KLSI device and can provide some information on it, I would be
  23  * most interested in adding support for it here. If you have any information
  24  * on the protocol used (or find errors in my reverse-engineered stuff), please
  25  * let me know.
  26  *
  27  * The code was only tested with a PalmConnect USB adapter; if you
  28  * are adventurous, try it with any KLSI-based device and let me know how it
  29  * breaks so that I can fix it!
  30  */
  31
  32 /* TODO:
  33  *      check modem line signals
  34  *      implement handshaking or decide that we do not support it
  35  */
  36
  37 /* History:
  38  *   0.3a - implemented pools of write URBs
  39  *   0.3  - alpha version for public testing
  40  *   0.2  - TIOCMGET works, so autopilot(1) can be used!
  41  *   0.1  - can be used to to pilot-xfer -p /dev/ttyUSB0 -l
  42  *
  43  *   The driver skeleton is mainly based on mct_u232.c and various other
  44  *   pieces of code shamelessly copied from the drivers/usb/serial/ directory.
  45  */
  46
  47
  48 #include <linux/kernel.h>
  49 #include <linux/errno.h>
  50 #include <linux/init.h>
  51 #include <linux/slab.h>
  52 #include <linux/tty.h>
  53 #include <linux/tty_driver.h>
  54 #include <linux/tty_flip.h>
  55 #include <linux/module.h>
  56 #include <asm/uaccess.h>
  57 #include <asm/unaligned.h>
  58 #include <linux/usb.h>
  59 #include <linux/usb/serial.h>
  60 #include "kl5kusb105.h"
  61
  62 static int debug;
  63
  64 /*
  65  * Version Information
  66  */
  67 #define DRIVER_VERSION "v0.3a"
  68 #define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>"
  69 #define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
  70
  71
  72 /*
  73  * Function prototypes
  74  */
  75 static int  klsi_105_startup             (struct usb_serial *serial);
  76 static void klsi_105_shutdown            (struct usb_serial *serial);
  77 static int  klsi_105_open                (struct usb_serial_port *port,
  78                                           struct file *filp);
  79 static void klsi_105_close               (struct usb_serial_port *port,
  80                                           struct file *filp);
  81 static int  klsi_105_write               (struct usb_serial_port *port,
  82                                           const unsigned char *buf,
  83                                           int count);
  84 static void klsi_105_write_bulk_callback (struct urb *urb);
  85 static int  klsi_105_chars_in_buffer     (struct usb_serial_port *port);
  86 static int  klsi_105_write_room          (struct usb_serial_port *port);
  87
  88 static void klsi_105_read_bulk_callback  (struct urb *urb);
  89 static void klsi_105_set_termios         (struct usb_serial_port *port,
  90                                           struct ktermios *old);
  91 static void klsi_105_throttle            (struct usb_serial_port *port);
  92 static void klsi_105_unthrottle          (struct usb_serial_port *port);
  93 /*
  94 static void klsi_105_break_ctl           (struct usb_serial_port *port,
  95                                           int break_state );
  96  */
  97 static int  klsi_105_tiocmget            (struct usb_serial_port *port,
  98                                           struct file *file);
  99 static int  klsi_105_tiocmset            (struct usb_serial_port *port,
 100                                           struct file *file, unsigned int set,
 101                                           unsigned int clear);
 102
 103 /*
 104  * All of the device info needed for the KLSI converters.
 105  */
 106 static struct usb_device_id id_table [] = {
 107         { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
 108         { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
 109         { }             /* Terminating entry */
 110 };
 111
 112 MODULE_DEVICE_TABLE (usb, id_table);
 113
 114 static struct usb_driver kl5kusb105d_driver = {
 115         .name =         "kl5kusb105d",
 116         .probe =        usb_serial_probe,
 117         .disconnect =   usb_serial_disconnect,
 118         .id_table =     id_table,
 119         .no_dynamic_id =        1,
 120 };
 121
 122 static struct usb_serial_driver kl5kusb105d_device = {
 123         .driver = {
 124                 .owner =        THIS_MODULE,
 125                 .name =         "kl5kusb105d",
 126         },
 127         .description =       "KL5KUSB105D / PalmConnect",
 128         .usb_driver =        &kl5kusb105d_driver,
 129         .id_table =          id_table,
 130         .num_ports =         1,
 131         .open =              klsi_105_open,
 132         .close =             klsi_105_close,
 133         .write =             klsi_105_write,
 134         .write_bulk_callback = klsi_105_write_bulk_callback,
 135         .chars_in_buffer =   klsi_105_chars_in_buffer,
 136         .write_room =        klsi_105_write_room,
 137         .read_bulk_callback =klsi_105_read_bulk_callback,
 138         .set_termios =       klsi_105_set_termios,
 139         /*.break_ctl =       klsi_105_break_ctl,*/
 140         .tiocmget =          klsi_105_tiocmget,
 141         .tiocmset =          klsi_105_tiocmset,
 142         .attach =            klsi_105_startup,
 143         .shutdown =          klsi_105_shutdown,
 144         .throttle =          klsi_105_throttle,
 145         .unthrottle =        klsi_105_unthrottle,
 146 };
 147
 148 struct klsi_105_port_settings {
 149         __u8    pktlen;         /* always 5, it seems */
 150         __u8    baudrate;
 151         __u8    databits;
 152         __u8    unknown1;
 153         __u8    unknown2;
 154 } __attribute__ ((packed));
 155
 156 /* we implement a pool of NUM_URBS urbs per usb_serial */
 157 #define NUM_URBS                        1
 158 #define URB_TRANSFER_BUFFER_SIZE        64
 159 struct klsi_105_private {
 160         struct klsi_105_port_settings   cfg;
 161         struct ktermios                 termios;
 162         unsigned long                   line_state; /* modem line settings */
 163         /* write pool */
 164         struct urb *                    write_urb_pool[NUM_URBS];
 165         spinlock_t                      lock;
 166         unsigned long                   bytes_in;
 167         unsigned long                   bytes_out;
 168 };
 169
 170
 171 /*
 172  * Handle vendor specific USB requests
 173  */
 174
 175
 176 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 177
 178 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 179                                       struct klsi_105_port_settings *settings)
 180 {
 181         int rc;
 182
 183         rc = usb_control_msg(port->serial->dev,
 184                              usb_sndctrlpipe(port->serial->dev, 0),
 185                              KL5KUSB105A_SIO_SET_DATA,
 186                              USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 187                              0, /* value */
 188                              0, /* index */
 189                              settings,
 190                              sizeof(struct klsi_105_port_settings),
 191                              KLSI_TIMEOUT);
 192         if (rc < 0)
 193                 err("Change port settings failed (error = %d)", rc);
 194         info("%s - %d byte block, baudrate %x, databits %d, u1 %d, u2 %d",
 195             __func__,
 196             settings->pktlen,
 197             settings->baudrate, settings->databits,
 198             settings->unknown1, settings->unknown2);
 199         return rc;
 200 } /* klsi_105_chg_port_settings */
 201
 202 /* translate a 16-bit status value from the device to linux's TIO bits */
 203 static unsigned long klsi_105_status2linestate(const __u16 status)
 204 {
 205         unsigned long res = 0;
 206
 207         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 208               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 209               ;
 210
 211         return res;
 212 }
 213 /*
 214  * Read line control via vendor command and return result through
 215  * *line_state_p
 216  */
 217 /* It seems that the status buffer has always only 2 bytes length */
 218 #define KLSI_STATUSBUF_LEN      2
 219 static int klsi_105_get_line_state(struct usb_serial_port *port,
 220                                    unsigned long *line_state_p)
 221 {
 222         int rc;
 223         __u8 status_buf[KLSI_STATUSBUF_LEN] = { -1,-1};
 224         __u16 status;
 225
 226         info("%s - sending SIO Poll request", __func__);
 227         rc = usb_control_msg(port->serial->dev,
 228                              usb_rcvctrlpipe(port->serial->dev, 0),
 229                              KL5KUSB105A_SIO_POLL,
 230                              USB_TYPE_VENDOR | USB_DIR_IN,
 231                              0, /* value */
 232                              0, /* index */
 233                              status_buf, KLSI_STATUSBUF_LEN,
 234                              10000
 235                              );
 236         if (rc < 0)
 237                 err("Reading line status failed (error = %d)", rc);
 238         else {
 239                 status = le16_to_cpu(get_unaligned((__le16 *)status_buf));
 240
 241                 info("%s - read status %x %x", __func__,
 242                      status_buf[0], status_buf[1]);
 243
 244                 *line_state_p = klsi_105_status2linestate(status);
 245         }
 246
 247         return rc;
 248 }
 249
 250
 251 /*
 252  * Driver's tty interface functions
 253  */
 254
 255 static int klsi_105_startup (struct usb_serial *serial)
 256 {
 257         struct klsi_105_private *priv;
 258         int i, j;
 259
 260         /* check if we support the product id (see keyspan.c)
 261          * FIXME
 262          */
 263
 264         /* allocate the private data structure */
 265         for (i=0; i<serial->num_ports; i++) {
 266                 priv = kmalloc(sizeof(struct klsi_105_private),
 267                                                    GFP_KERNEL);
 268                 if (!priv) {
 269                         dbg("%skmalloc for klsi_105_private failed.", __func__);
 270                         i--;
 271                         goto err_cleanup;
 272                 }
 273                 /* set initial values for control structures */
 274                 priv->cfg.pktlen    = 5;
 275                 priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 276                 priv->cfg.databits  = kl5kusb105a_dtb_8;
 277                 priv->cfg.unknown1  = 0;
 278                 priv->cfg.unknown2  = 1;
 279
 280                 priv->line_state    = 0;
 281
 282                 priv->bytes_in      = 0;
 283                 priv->bytes_out     = 0;
 284                 usb_set_serial_port_data(serial->port[i], priv);
 285
 286                 spin_lock_init (&priv->lock);
 287                 for (j=0; j<NUM_URBS; j++) {
 288                         struct urb* urb = usb_alloc_urb(0, GFP_KERNEL);
 289
 290                         priv->write_urb_pool[j] = urb;
 291                         if (urb == NULL) {
 292                                 err("No more urbs???");
 293                                 goto err_cleanup;
 294                         }
 295
 296                         urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE,
 297                                                         GFP_KERNEL);
 298                         if (!urb->transfer_buffer) {
 299                                 err("%s - out of memory for urb buffers.", __func__);
 300                                 goto err_cleanup;
 301                         }
 302                 }
 303
 304                 /* priv->termios is left uninitalized until port opening */
 305                 init_waitqueue_head(&serial->port[i]->write_wait);
 306         }
 307
 308         return 0;
 309
 310 err_cleanup:
 311         for (; i >= 0; i--) {
 312                 priv = usb_get_serial_port_data(serial->port[i]);
 313                 for (j=0; j < NUM_URBS; j++) {
 314                         if (priv->write_urb_pool[j]) {
 315                                 kfree(priv->write_urb_pool[j]->transfer_buffer);
 316                                 usb_free_urb(priv->write_urb_pool[j]);
 317                         }
 318                 }
 319                 usb_set_serial_port_data(serial->port[i], NULL);
 320         }
 321         return -ENOMEM;
 322 } /* klsi_105_startup */
 323
 324
 325 static void klsi_105_shutdown (struct usb_serial *serial)
 326 {
 327         int i;
 328
 329         dbg("%s", __func__);
 330
 331         /* stop reads and writes on all ports */
 332         for (i=0; i < serial->num_ports; ++i) {
 333                 struct klsi_105_private *priv = usb_get_serial_port_data(serial->port[i]);
 334                 unsigned long flags;
 335
 336                 if (priv) {
 337                         /* kill our write urb pool */
 338                         int j;
 339                         struct urb **write_urbs = priv->write_urb_pool;
 340                         spin_lock_irqsave(&priv->lock,flags);
 341
 342                         for (j = 0; j < NUM_URBS; j++) {
 343                                 if (write_urbs[j]) {
 344                                         /* FIXME - uncomment the following
 345                                          * usb_kill_urb call when the host
 346                                          * controllers get fixed to set
 347                                          * urb->dev = NULL after the urb is
 348                                          * finished.  Otherwise this call
 349                                          * oopses. */
 350                                         /* usb_kill_urb(write_urbs[j]); */
 351                                         kfree(write_urbs[j]->transfer_buffer);
 352                                         usb_free_urb (write_urbs[j]);
 353                                 }
 354                         }
 355
 356                         spin_unlock_irqrestore (&priv->lock, flags);
 357
 358                         kfree(priv);
 359                         usb_set_serial_port_data(serial->port[i], NULL);
 360                 }
 361         }
 362 } /* klsi_105_shutdown */
 363
 364 static int  klsi_105_open (struct usb_serial_port *port, struct file *filp)
 365 {
 366         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 367         int retval = 0;
 368         int rc;
 369         int i;
 370         unsigned long line_state;
 371         struct klsi_105_port_settings cfg;
 372         unsigned long flags;
 373
 374         dbg("%s port %d", __func__, port->number);
 375
 376         /* force low_latency on so that our tty_push actually forces
 377          * the data through
 378          * port->tty->low_latency = 1; */
 379
 380         /* Do a defined restart:
 381          * Set up sane default baud rate and send the 'READ_ON'
 382          * vendor command.
 383          * FIXME: set modem line control (how?)
 384          * Then read the modem line control and store values in
 385          * priv->line_state.
 386          */
 387         cfg.pktlen   = 5;
 388         cfg.baudrate = kl5kusb105a_sio_b9600;
 389         cfg.databits = kl5kusb105a_dtb_8;
 390         cfg.unknown1 = 0;
 391         cfg.unknown2 = 1;
 392         klsi_105_chg_port_settings(port, &cfg);
 393
 394         /* set up termios structure */
 395         spin_lock_irqsave (&priv->lock, flags);
 396         priv->termios.c_iflag = port->tty->termios->c_iflag;
 397         priv->termios.c_oflag = port->tty->termios->c_oflag;
 398         priv->termios.c_cflag = port->tty->termios->c_cflag;
 399         priv->termios.c_lflag = port->tty->termios->c_lflag;
 400         for (i=0; i<NCCS; i++)
 401                 priv->termios.c_cc[i] = port->tty->termios->c_cc[i];
 402         priv->cfg.pktlen   = cfg.pktlen;
 403         priv->cfg.baudrate = cfg.baudrate;
 404         priv->cfg.databits = cfg.databits;
 405         priv->cfg.unknown1 = cfg.unknown1;
 406         priv->cfg.unknown2 = cfg.unknown2;
 407         spin_unlock_irqrestore (&priv->lock, flags);
 408
 409         /* READ_ON and urb submission */
 410         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
 411                       usb_rcvbulkpipe(port->serial->dev,
 412                                       port->bulk_in_endpointAddress),
 413                       port->read_urb->transfer_buffer,
 414                       port->read_urb->transfer_buffer_length,
 415                       klsi_105_read_bulk_callback,
 416                       port);
 417
 418         rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
 419         if (rc) {
 420                 err("%s - failed submitting read urb, error %d", __func__, rc);
 421                 retval = rc;
 422                 goto exit;
 423         }
 424
 425         rc = usb_control_msg(port->serial->dev,
 426                              usb_sndctrlpipe(port->serial->dev,0),
 427                              KL5KUSB105A_SIO_CONFIGURE,
 428                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 429                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 430                              0, /* index */
 431                              NULL,
 432                              0,
 433                              KLSI_TIMEOUT);
 434         if (rc < 0) {
 435                 err("Enabling read failed (error = %d)", rc);
 436                 retval = rc;
 437         } else
 438                 dbg("%s - enabled reading", __func__);
 439
 440         rc = klsi_105_get_line_state(port, &line_state);
 441         if (rc >= 0) {
 442                 spin_lock_irqsave (&priv->lock, flags);
 443                 priv->line_state = line_state;
 444                 spin_unlock_irqrestore (&priv->lock, flags);
 445                 dbg("%s - read line state 0x%lx", __func__, line_state);
 446                 retval = 0;
 447         } else
 448                 retval = rc;
 449
 450 exit:
 451         return retval;
 452 } /* klsi_105_open */
 453
 454
 455 static void klsi_105_close (struct usb_serial_port *port, struct file *filp)
 456 {
 457         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 458         int rc;
 459
 460         dbg("%s port %d", __func__, port->number);
 461
 462         mutex_lock(&port->serial->disc_mutex);
 463         if (!port->serial->disconnected) {
 464                 /* send READ_OFF */
 465                 rc = usb_control_msg (port->serial->dev,
 466                                       usb_sndctrlpipe(port->serial->dev, 0),
 467                                       KL5KUSB105A_SIO_CONFIGURE,
 468                                       USB_TYPE_VENDOR | USB_DIR_OUT,
 469                                       KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 470                                       0, /* index */
 471                                       NULL, 0,
 472                                       KLSI_TIMEOUT);
 473                 if (rc < 0)
 474                         err("Disabling read failed (error = %d)", rc);
 475         }
 476         mutex_unlock(&port->serial->disc_mutex);
 477
 478         /* shutdown our bulk reads and writes */
 479         usb_kill_urb(port->write_urb);
 480         usb_kill_urb(port->read_urb);
 481         /* unlink our write pool */
 482         /* FIXME */
 483         /* wgg - do I need this? I think so. */
 484         usb_kill_urb(port->interrupt_in_urb);
 485         info("kl5kusb105 port stats: %ld bytes in, %ld bytes out", priv->bytes_in, priv->bytes_out);
 486 } /* klsi_105_close */
 487
 488
 489 /* We need to write a complete 64-byte data block and encode the
 490  * number actually sent in the first double-byte, LSB-order. That
 491  * leaves at most 62 bytes of payload.
 492  */
 493 #define KLSI_105_DATA_OFFSET    2   /* in the bulk urb data block */
 494
 495
 496 static int klsi_105_write (struct usb_serial_port *port,
 497                            const unsigned char *buf, int count)
 498 {
 499         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 500         int result, size;
 501         int bytes_sent=0;
 502
 503         dbg("%s - port %d", __func__, port->number);
 504
 505         while (count > 0) {
 506                 /* try to find a free urb (write 0 bytes if none) */
 507                 struct urb *urb = NULL;
 508                 unsigned long flags;
 509                 int i;
 510                 /* since the pool is per-port we might not need the spin lock !? */
 511                 spin_lock_irqsave (&priv->lock, flags);
 512                 for (i=0; i<NUM_URBS; i++) {
 513                         if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
 514                                 urb = priv->write_urb_pool[i];
 515                                 dbg("%s - using pool URB %d", __func__, i);
 516                                 break;
 517                         }
 518                 }
 519                 spin_unlock_irqrestore (&priv->lock, flags);
 520
 521                 if (urb==NULL) {
 522                         dbg("%s - no more free urbs", __func__);
 523                         goto exit;
 524                 }
 525
 526                 if (urb->transfer_buffer == NULL) {
 527                         urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
 528                         if (urb->transfer_buffer == NULL) {
 529                                 err("%s - no more kernel memory...", __func__);
 530                                 goto exit;
 531                         }
 532                 }
 533
 534                 size = min (count, port->bulk_out_size - KLSI_105_DATA_OFFSET);
 535                 size = min (size, URB_TRANSFER_BUFFER_SIZE - KLSI_105_DATA_OFFSET);
 536
 537                 memcpy (urb->transfer_buffer + KLSI_105_DATA_OFFSET, buf, size);
 538
 539                 /* write payload size into transfer buffer */
 540                 ((__u8 *)urb->transfer_buffer)[0] = (__u8) (size & 0xFF);
 541                 ((__u8 *)urb->transfer_buffer)[1] = (__u8) ((size & 0xFF00)>>8);
 542
 543                 /* set up our urb */
 544                 usb_fill_bulk_urb(urb, port->serial->dev,
 545                               usb_sndbulkpipe(port->serial->dev,
 546                                               port->bulk_out_endpointAddress),
 547                               urb->transfer_buffer,
 548                               URB_TRANSFER_BUFFER_SIZE,
 549                               klsi_105_write_bulk_callback,
 550                               port);
 551
 552                 /* send the data out the bulk port */
 553                 result = usb_submit_urb(urb, GFP_ATOMIC);
 554                 if (result) {
 555                         err("%s - failed submitting write urb, error %d", __func__, result);
 556                         goto exit;
 557                 }
 558                 buf += size;
 559                 bytes_sent += size;
 560                 count -= size;
 561         }
 562 exit:
 563         /* lockless, but it's for debug info only... */
 564         priv->bytes_out+=bytes_sent;
 565
 566         return bytes_sent;      /* that's how much we wrote */
 567 } /* klsi_105_write */
 568
 569 static void klsi_105_write_bulk_callback ( struct urb *urb)
 570 {
 571         struct usb_serial_port *port = urb->context;
 572         int status = urb->status;
 573
 574         dbg("%s - port %d", __func__, port->number);
 575
 576         if (status) {
 577                 dbg("%s - nonzero write bulk status received: %d", __func__,
 578                     status);
 579                 return;
 580         }
 581
 582         usb_serial_port_softint(port);
 583 } /* klsi_105_write_bulk_completion_callback */
 584
 585
 586 /* return number of characters currently in the writing process */
 587 static int klsi_105_chars_in_buffer (struct usb_serial_port *port)
 588 {
 589         int chars = 0;
 590         int i;
 591         unsigned long flags;
 592         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 593
 594         spin_lock_irqsave (&priv->lock, flags);
 595
 596         for (i = 0; i < NUM_URBS; ++i) {
 597                 if (priv->write_urb_pool[i]->status == -EINPROGRESS) {
 598                         chars += URB_TRANSFER_BUFFER_SIZE;
 599                 }
 600         }
 601
 602         spin_unlock_irqrestore (&priv->lock, flags);
 603
 604         dbg("%s - returns %d", __func__, chars);
 605         return (chars);
 606 }
 607
 608 static int klsi_105_write_room (struct usb_serial_port *port)
 609 {
 610         unsigned long flags;
 611         int i;
 612         int room = 0;
 613         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 614
 615         spin_lock_irqsave (&priv->lock, flags);
 616         for (i = 0; i < NUM_URBS; ++i) {
 617                 if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
 618                         room += URB_TRANSFER_BUFFER_SIZE;
 619                 }
 620         }
 621
 622         spin_unlock_irqrestore (&priv->lock, flags);
 623
 624         dbg("%s - returns %d", __func__, room);
 625         return (room);
 626 }
 627
 628
 629
 630 static void klsi_105_read_bulk_callback (struct urb *urb)
 631 {
 632         struct usb_serial_port *port = urb->context;
 633         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 634         struct tty_struct *tty;
 635         unsigned char *data = urb->transfer_buffer;
 636         int rc;
 637         int status = urb->status;
 638
 639         dbg("%s - port %d", __func__, port->number);
 640
 641         /* The urb might have been killed. */
 642         if (status) {
 643                 dbg("%s - nonzero read bulk status received: %d", __func__,
 644                     status);
 645                 return;
 646         }
 647
 648         /* The data received is again preceded by a length double-byte in LSB-
 649          * first order (see klsi_105_write() )
 650          */
 651         if (urb->actual_length == 0) {
 652                 /* empty urbs seem to happen, we ignore them */
 653                 /* dbg("%s - emtpy URB", __func__); */
 654                ;
 655         } else if (urb->actual_length <= 2) {
 656                 dbg("%s - size %d URB not understood", __func__,
 657                     urb->actual_length);
 658                 usb_serial_debug_data(debug, &port->dev, __func__,
 659                                       urb->actual_length, data);
 660         } else {
 661                 int bytes_sent = ((__u8 *) data)[0] +
 662                                  ((unsigned int) ((__u8 *) data)[1] << 8);
 663                 tty = port->tty;
 664                 /* we should immediately resubmit the URB, before attempting
 665                  * to pass the data on to the tty layer. But that needs locking
 666                  * against re-entry an then mixed-up data because of
 667                  * intermixed tty_flip_buffer_push()s
 668                  * FIXME
 669                  */
 670                 usb_serial_debug_data(debug, &port->dev, __func__,
 671                                       urb->actual_length, data);
 672
 673                 if (bytes_sent + 2 > urb->actual_length) {
 674                         dbg("%s - trying to read more data than available"
 675                             " (%d vs. %d)", __func__,
 676                             bytes_sent+2, urb->actual_length);
 677                         /* cap at implied limit */
 678                         bytes_sent = urb->actual_length - 2;
 679                 }
 680
 681                 tty_buffer_request_room(tty, bytes_sent);
 682                 tty_insert_flip_string(tty, data + 2, bytes_sent);
 683                 tty_flip_buffer_push(tty);
 684
 685                 /* again lockless, but debug info only */
 686                 priv->bytes_in += bytes_sent;
 687         }
 688         /* Continue trying to always read  */
 689         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
 690                       usb_rcvbulkpipe(port->serial->dev,
 691                                       port->bulk_in_endpointAddress),
 692                       port->read_urb->transfer_buffer,
 693                       port->read_urb->transfer_buffer_length,
 694                       klsi_105_read_bulk_callback,
 695                       port);
 696         rc = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 697         if (rc)
 698                 err("%s - failed resubmitting read urb, error %d", __func__, rc);
 699 } /* klsi_105_read_bulk_callback */
 700
 701
 702 static void klsi_105_set_termios (struct usb_serial_port *port,
 703                                   struct ktermios *old_termios)
 704 {
 705         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 706         struct tty_struct *tty = port->tty;
 707         unsigned int iflag = tty->termios->c_iflag;
 708         unsigned int old_iflag = old_termios->c_iflag;
 709         unsigned int cflag = tty->termios->c_cflag;
 710         unsigned int old_cflag = old_termios->c_cflag;
 711         struct klsi_105_port_settings cfg;
 712         unsigned long flags;
 713         speed_t baud;
 714
 715         /* lock while we are modifying the settings */
 716         spin_lock_irqsave (&priv->lock, flags);
 717
 718         /*
 719          * Update baud rate
 720          */
 721         baud = tty_get_baud_rate(tty);
 722
 723         if( (cflag & CBAUD) != (old_cflag & CBAUD) ) {
 724                 /* reassert DTR and (maybe) RTS on transition from B0 */
 725                 if( (old_cflag & CBAUD) == B0 ) {
 726                         dbg("%s: baud was B0", __func__);
 727 #if 0
 728                         priv->control_state |= TIOCM_DTR;
 729                         /* don't set RTS if using hardware flow control */
 730                         if (!(old_cflag & CRTSCTS)) {
 731                                 priv->control_state |= TIOCM_RTS;
 732                         }
 733                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 734 #endif
 735                 }
 736         }
 737         switch(baud) {
 738                 case 0: /* handled below */
 739                         break;
 740                 case 1200:
 741                         priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 742                         break;
 743                 case 2400:
 744                         priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 745                         break;
 746                 case 4800:
 747                         priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 748                         break;
 749                 case 9600:
 750                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 751                         break;
 752                 case 19200:
 753                         priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 754                         break;
 755                 case 38400:
 756                         priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 757                         break;
 758                 case 57600:
 759                         priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 760                         break;
 761                 case 115200:
 762                         priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 763                         break;
 764                 default:
 765                         dbg("KLSI USB->Serial converter:"
 766                             " unsupported baudrate request, using default"
 767                             " of 9600");
 768                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 769                         baud = 9600;
 770                         break;
 771         }
 772         if ((cflag & CBAUD) == B0 ) {
 773                 dbg("%s: baud is B0", __func__);
 774                 /* Drop RTS and DTR */
 775                 /* maybe this should be simulated by sending read
 776                  * disable and read enable messages?
 777                  */
 778                 ;
 779 #if 0
 780                 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 781                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 782 #endif
 783         }
 784         tty_encode_baud_rate(tty, baud, baud);
 785
 786         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 787                 /* set the number of data bits */
 788                 switch (cflag & CSIZE) {
 789                 case CS5:
 790                         dbg("%s - 5 bits/byte not supported", __func__);
 791                         spin_unlock_irqrestore (&priv->lock, flags);
 792                         return ;
 793                 case CS6:
 794                         dbg("%s - 6 bits/byte not supported", __func__);
 795                         spin_unlock_irqrestore (&priv->lock, flags);
 796                         return ;
 797                 case CS7:
 798                         priv->cfg.databits = kl5kusb105a_dtb_7;
 799                         break;
 800                 case CS8:
 801                         priv->cfg.databits = kl5kusb105a_dtb_8;
 802                         break;
 803                 default:
 804                         err("CSIZE was not CS5-CS8, using default of 8");
 805                         priv->cfg.databits = kl5kusb105a_dtb_8;
 806                         break;
 807                 }
 808         }
 809
 810         /*
 811          * Update line control register (LCR)
 812          */
 813         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 814             || (cflag & CSTOPB) != (old_cflag & CSTOPB) ) {
 815
 816                 /* Not currently supported */
 817                 tty->termios->c_cflag &= ~(PARENB|PARODD|CSTOPB);
 818 #if 0
 819                 priv->last_lcr = 0;
 820
 821                 /* set the parity */
 822                 if (cflag & PARENB)
 823                         priv->last_lcr |= (cflag & PARODD) ?
 824                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 825                 else
 826                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 827
 828                 /* set the number of stop bits */
 829                 priv->last_lcr |= (cflag & CSTOPB) ?
 830                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 831
 832                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 833 #endif
 834                 ;
 835         }
 836
 837         /*
 838          * Set flow control: well, I do not really now how to handle DTR/RTS.
 839          * Just do what we have seen with SniffUSB on Win98.
 840          */
 841         if( (iflag & IXOFF) != (old_iflag & IXOFF)
 842             || (iflag & IXON) != (old_iflag & IXON)
 843             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS) ) {
 844
 845                 /* Not currently supported */
 846                 tty->termios->c_cflag &= ~CRTSCTS;
 847                 /* Drop DTR/RTS if no flow control otherwise assert */
 848 #if 0
 849                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS) )
 850                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 851                 else
 852                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 853                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 854 #endif
 855                 ;
 856         }
 857         memcpy (&cfg, &priv->cfg, sizeof(cfg));
 858         spin_unlock_irqrestore (&priv->lock, flags);
 859
 860         /* now commit changes to device */
 861         klsi_105_chg_port_settings(port, &cfg);
 862 } /* klsi_105_set_termios */
 863
 864
 865 #if 0
 866 static void mct_u232_break_ctl( struct usb_serial_port *port, int break_state )
 867 {
 868         struct usb_serial *serial = port->serial;
 869         struct mct_u232_private *priv = (struct mct_u232_private *)port->private;
 870         unsigned char lcr = priv->last_lcr;
 871
 872         dbg("%sstate=%d", __func__, break_state);
 873
 874         if (break_state)
 875                 lcr |= MCT_U232_SET_BREAK;
 876
 877         mct_u232_set_line_ctrl(serial, lcr);
 878 } /* mct_u232_break_ctl */
 879 #endif
 880
 881 static int klsi_105_tiocmget (struct usb_serial_port *port, struct file *file)
 882 {
 883         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 884         unsigned long flags;
 885         int rc;
 886         unsigned long line_state;
 887         dbg("%s - request, just guessing", __func__);
 888
 889         rc = klsi_105_get_line_state(port, &line_state);
 890         if (rc < 0) {
 891                 err("Reading line control failed (error = %d)", rc);
 892                 /* better return value? EAGAIN? */
 893                 return rc;
 894         }
 895
 896         spin_lock_irqsave (&priv->lock, flags);
 897         priv->line_state = line_state;
 898         spin_unlock_irqrestore (&priv->lock, flags);
 899         dbg("%s - read line state 0x%lx", __func__, line_state);
 900         return (int)line_state;
 901 }
 902
 903 static int klsi_105_tiocmset (struct usb_serial_port *port, struct file *file,
 904                               unsigned int set, unsigned int clear)
 905 {
 906         int retval = -EINVAL;
 907
 908         dbg("%s", __func__);
 909
 910 /* if this ever gets implemented, it should be done something like this:
 911         struct usb_serial *serial = port->serial;
 912         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 913         unsigned long flags;
 914         int control;
 915
 916         spin_lock_irqsave (&priv->lock, flags);
 917         if (set & TIOCM_RTS)
 918                 priv->control_state |= TIOCM_RTS;
 919         if (set & TIOCM_DTR)
 920                 priv->control_state |= TIOCM_DTR;
 921         if (clear & TIOCM_RTS)
 922                 priv->control_state &= ~TIOCM_RTS;
 923         if (clear & TIOCM_DTR)
 924                 priv->control_state &= ~TIOCM_DTR;
 925         control = priv->control_state;
 926         spin_unlock_irqrestore (&priv->lock, flags);
 927         retval = mct_u232_set_modem_ctrl(serial, control);
 928 */
 929         return retval;
 930 }
 931
 932 static void klsi_105_throttle (struct usb_serial_port *port)
 933 {
 934         dbg("%s - port %d", __func__, port->number);
 935         usb_kill_urb(port->read_urb);
 936 }
 937
 938 static void klsi_105_unthrottle (struct usb_serial_port *port)
 939 {
 940         int result;
 941
 942         dbg("%s - port %d", __func__, port->number);
 943
 944         port->read_urb->dev = port->serial->dev;
 945         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 946         if (result)
 947                 err("%s - failed submitting read urb, error %d", __func__,
 948                     result);
 949 }
 950
 951
 952
 953 static int __init klsi_105_init (void)
 954 {
 955         int retval;
 956         retval = usb_serial_register(&kl5kusb105d_device);
 957         if (retval)
 958                 goto failed_usb_serial_register;
 959         retval = usb_register(&kl5kusb105d_driver);
 960         if (retval)
 961                 goto failed_usb_register;
 962
 963         info(DRIVER_DESC " " DRIVER_VERSION);
 964         return 0;
 965 failed_usb_register:
 966         usb_serial_deregister(&kl5kusb105d_device);
 967 failed_usb_serial_register:
 968         return retval;
 969 }
 970
 971
 972 static void __exit klsi_105_exit (void)
 973 {
 974         usb_deregister (&kl5kusb105d_driver);
 975         usb_serial_deregister (&kl5kusb105d_device);
 976 }
 977
 978
 979 module_init (klsi_105_init);
 980 module_exit (klsi_105_exit);
 981
 982 MODULE_AUTHOR( DRIVER_AUTHOR );
 983 MODULE_DESCRIPTION( DRIVER_DESC );
 984 MODULE_LICENSE("GPL");
 985
 986
 987 module_param(debug, bool, S_IRUGO | S_IWUSR);
 988 MODULE_PARM_DESC(debug, "enable extensive debugging messages");
 989
 990 /* vim: set sts=8 ts=8 sw=8: */