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 <linux/usb.h>
  58 #include <linux/usb/serial.h>
  59 #include "kl5kusb105.h"
  60
  61 static int debug;
  62
  63 /*
  64  * Version Information
  65  */
  66 #define DRIVER_VERSION "v0.3a"
  67 #define DRIVER_AUTHOR "Utz-Uwe Haus <haus@uuhaus.de>"
  68 #define DRIVER_DESC "KLSI KL5KUSB105 chipset USB->Serial Converter driver"
  69
  70
  71 /*
  72  * Function prototypes
  73  */
  74 static int  klsi_105_startup             (struct usb_serial *serial);
  75 static void klsi_105_shutdown            (struct usb_serial *serial);
  76 static int  klsi_105_open                (struct usb_serial_port *port,
  77                                           struct file *filp);
  78 static void klsi_105_close               (struct usb_serial_port *port,
  79                                           struct file *filp);
  80 static int  klsi_105_write               (struct usb_serial_port *port,
  81                                           const unsigned char *buf,
  82                                           int count);
  83 static void klsi_105_write_bulk_callback (struct urb *urb);
  84 static int  klsi_105_chars_in_buffer     (struct usb_serial_port *port);
  85 static int  klsi_105_write_room          (struct usb_serial_port *port);
  86
  87 static void klsi_105_read_bulk_callback  (struct urb *urb);
  88 static void klsi_105_set_termios         (struct usb_serial_port *port,
  89                                           struct ktermios *old);
  90 static void klsi_105_throttle            (struct usb_serial_port *port);
  91 static void klsi_105_unthrottle          (struct usb_serial_port *port);
  92 /*
  93 static void klsi_105_break_ctl           (struct usb_serial_port *port,
  94                                           int break_state );
  95  */
  96 static int  klsi_105_tiocmget            (struct usb_serial_port *port,
  97                                           struct file *file);
  98 static int  klsi_105_tiocmset            (struct usb_serial_port *port,
  99                                           struct file *file, unsigned int set,
 100                                           unsigned int clear);
 101
 102 /*
 103  * All of the device info needed for the KLSI converters.
 104  */
 105 static struct usb_device_id id_table [] = {
 106         { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
 107         { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
 108         { }             /* Terminating entry */
 109 };
 110
 111 MODULE_DEVICE_TABLE (usb, id_table);
 112
 113 static struct usb_driver kl5kusb105d_driver = {
 114         .name =         "kl5kusb105d",
 115         .probe =        usb_serial_probe,
 116         .disconnect =   usb_serial_disconnect,
 117         .id_table =     id_table,
 118         .no_dynamic_id =        1,
 119 };
 120
 121 static struct usb_serial_driver kl5kusb105d_device = {
 122         .driver = {
 123                 .owner =        THIS_MODULE,
 124                 .name =         "kl5kusb105d",
 125         },
 126         .description =       "KL5KUSB105D / PalmConnect",
 127         .usb_driver =        &kl5kusb105d_driver,
 128         .id_table =          id_table,
 129         .num_interrupt_in =  1,
 130         .num_bulk_in =       1,
 131         .num_bulk_out =      1,
 132         .num_ports =         1,
 133         .open =              klsi_105_open,
 134         .close =             klsi_105_close,
 135         .write =             klsi_105_write,
 136         .write_bulk_callback = klsi_105_write_bulk_callback,
 137         .chars_in_buffer =   klsi_105_chars_in_buffer,
 138         .write_room =        klsi_105_write_room,
 139         .read_bulk_callback =klsi_105_read_bulk_callback,
 140         .set_termios =       klsi_105_set_termios,
 141         /*.break_ctl =       klsi_105_break_ctl,*/
 142         .tiocmget =          klsi_105_tiocmget,
 143         .tiocmset =          klsi_105_tiocmset,
 144         .attach =            klsi_105_startup,
 145         .shutdown =          klsi_105_shutdown,
 146         .throttle =          klsi_105_throttle,
 147         .unthrottle =        klsi_105_unthrottle,
 148 };
 149
 150 struct klsi_105_port_settings {
 151         __u8    pktlen;         /* always 5, it seems */
 152         __u8    baudrate;
 153         __u8    databits;
 154         __u8    unknown1;
 155         __u8    unknown2;
 156 } __attribute__ ((packed));
 157
 158 /* we implement a pool of NUM_URBS urbs per usb_serial */
 159 #define NUM_URBS                        1
 160 #define URB_TRANSFER_BUFFER_SIZE        64
 161 struct klsi_105_private {
 162         struct klsi_105_port_settings   cfg;
 163         struct ktermios                 termios;
 164         unsigned long                   line_state; /* modem line settings */
 165         /* write pool */
 166         struct urb *                    write_urb_pool[NUM_URBS];
 167         spinlock_t                      lock;
 168         unsigned long                   bytes_in;
 169         unsigned long                   bytes_out;
 170 };
 171
 172
 173 /*
 174  * Handle vendor specific USB requests
 175  */
 176
 177
 178 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 179
 180 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 181                                       struct klsi_105_port_settings *settings)
 182 {
 183         int rc;
 184
 185         rc = usb_control_msg(port->serial->dev,
 186                              usb_sndctrlpipe(port->serial->dev, 0),
 187                              KL5KUSB105A_SIO_SET_DATA,
 188                              USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 189                              0, /* value */
 190                              0, /* index */
 191                              settings,
 192                              sizeof(struct klsi_105_port_settings),
 193                              KLSI_TIMEOUT);
 194         if (rc < 0)
 195                 err("Change port settings failed (error = %d)", rc);
 196         info("%s - %d byte block, baudrate %x, databits %d, u1 %d, u2 %d",
 197             __FUNCTION__,
 198             settings->pktlen,
 199             settings->baudrate, settings->databits,
 200             settings->unknown1, settings->unknown2);
 201         return rc;
 202 } /* klsi_105_chg_port_settings */
 203
 204 /* translate a 16-bit status value from the device to linux's TIO bits */
 205 static unsigned long klsi_105_status2linestate(const __u16 status)
 206 {
 207         unsigned long res = 0;
 208
 209         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 210               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 211               ;
 212
 213         return res;
 214 }
 215 /*
 216  * Read line control via vendor command and return result through
 217  * *line_state_p
 218  */
 219 /* It seems that the status buffer has always only 2 bytes length */
 220 #define KLSI_STATUSBUF_LEN      2
 221 static int klsi_105_get_line_state(struct usb_serial_port *port,
 222                                    unsigned long *line_state_p)
 223 {
 224         int rc;
 225         __u8 status_buf[KLSI_STATUSBUF_LEN] = { -1,-1};
 226         __u16 status;
 227
 228         info("%s - sending SIO Poll request", __FUNCTION__);
 229         rc = usb_control_msg(port->serial->dev,
 230                              usb_rcvctrlpipe(port->serial->dev, 0),
 231                              KL5KUSB105A_SIO_POLL,
 232                              USB_TYPE_VENDOR | USB_DIR_IN,
 233                              0, /* value */
 234                              0, /* index */
 235                              status_buf, KLSI_STATUSBUF_LEN,
 236                              10000
 237                              );
 238         if (rc < 0)
 239                 err("Reading line status failed (error = %d)", rc);
 240         else {
 241                 status = le16_to_cpu(*(u16 *)status_buf);
 242
 243                 info("%s - read status %x %x", __FUNCTION__,
 244                      status_buf[0], status_buf[1]);
 245
 246                 *line_state_p = klsi_105_status2linestate(status);
 247         }
 248
 249         return rc;
 250 }
 251
 252
 253 /*
 254  * Driver's tty interface functions
 255  */
 256
 257 static int klsi_105_startup (struct usb_serial *serial)
 258 {
 259         struct klsi_105_private *priv;
 260         int i, j;
 261
 262         /* check if we support the product id (see keyspan.c)
 263          * FIXME
 264          */
 265
 266         /* allocate the private data structure */
 267         for (i=0; i<serial->num_ports; i++) {
 268                 priv = kmalloc(sizeof(struct klsi_105_private),
 269                                                    GFP_KERNEL);
 270                 if (!priv) {
 271                         dbg("%skmalloc for klsi_105_private failed.", __FUNCTION__);
 272                         i--;
 273                         goto err_cleanup;
 274                 }
 275                 /* set initial values for control structures */
 276                 priv->cfg.pktlen    = 5;
 277                 priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 278                 priv->cfg.databits  = kl5kusb105a_dtb_8;
 279                 priv->cfg.unknown1  = 0;
 280                 priv->cfg.unknown2  = 1;
 281
 282                 priv->line_state    = 0;
 283
 284                 priv->bytes_in      = 0;
 285                 priv->bytes_out     = 0;
 286                 usb_set_serial_port_data(serial->port[i], priv);
 287
 288                 spin_lock_init (&priv->lock);
 289                 for (j=0; j<NUM_URBS; j++) {
 290                         struct urb* urb = usb_alloc_urb(0, GFP_KERNEL);
 291
 292                         priv->write_urb_pool[j] = urb;
 293                         if (urb == NULL) {
 294                                 err("No more urbs???");
 295                                 goto err_cleanup;
 296                         }
 297
 298                         urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE,
 299                                                         GFP_KERNEL);
 300                         if (!urb->transfer_buffer) {
 301                                 err("%s - out of memory for urb buffers.", __FUNCTION__);
 302                                 goto err_cleanup;
 303                         }
 304                 }
 305
 306                 /* priv->termios is left uninitalized until port opening */
 307                 init_waitqueue_head(&serial->port[i]->write_wait);
 308         }
 309
 310         return 0;
 311
 312 err_cleanup:
 313         for (; i >= 0; i--) {
 314                 priv = usb_get_serial_port_data(serial->port[i]);
 315                 for (j=0; j < NUM_URBS; j++) {
 316                         if (priv->write_urb_pool[j]) {
 317                                 kfree(priv->write_urb_pool[j]->transfer_buffer);
 318                                 usb_free_urb(priv->write_urb_pool[j]);
 319                         }
 320                 }
 321                 usb_set_serial_port_data(serial->port[i], NULL);
 322         }
 323         return -ENOMEM;
 324 } /* klsi_105_startup */
 325
 326
 327 static void klsi_105_shutdown (struct usb_serial *serial)
 328 {
 329         int i;
 330
 331         dbg("%s", __FUNCTION__);
 332
 333         /* stop reads and writes on all ports */
 334         for (i=0; i < serial->num_ports; ++i) {
 335                 struct klsi_105_private *priv = usb_get_serial_port_data(serial->port[i]);
 336                 unsigned long flags;
 337
 338                 if (priv) {
 339                         /* kill our write urb pool */
 340                         int j;
 341                         struct urb **write_urbs = priv->write_urb_pool;
 342                         spin_lock_irqsave(&priv->lock,flags);
 343
 344                         for (j = 0; j < NUM_URBS; j++) {
 345                                 if (write_urbs[j]) {
 346                                         /* FIXME - uncomment the following
 347                                          * usb_kill_urb call when the host
 348                                          * controllers get fixed to set
 349                                          * urb->dev = NULL after the urb is
 350                                          * finished.  Otherwise this call
 351                                          * oopses. */
 352                                         /* usb_kill_urb(write_urbs[j]); */
 353                                         kfree(write_urbs[j]->transfer_buffer);
 354                                         usb_free_urb (write_urbs[j]);
 355                                 }
 356                         }
 357
 358                         spin_unlock_irqrestore (&priv->lock, flags);
 359
 360                         kfree(priv);
 361                         usb_set_serial_port_data(serial->port[i], NULL);
 362                 }
 363         }
 364 } /* klsi_105_shutdown */
 365
 366 static int  klsi_105_open (struct usb_serial_port *port, struct file *filp)
 367 {
 368         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 369         int retval = 0;
 370         int rc;
 371         int i;
 372         unsigned long line_state;
 373         struct klsi_105_port_settings cfg;
 374         unsigned long flags;
 375
 376         dbg("%s port %d", __FUNCTION__, port->number);
 377
 378         /* force low_latency on so that our tty_push actually forces
 379          * the data through
 380          * port->tty->low_latency = 1; */
 381
 382         /* Do a defined restart:
 383          * Set up sane default baud rate and send the 'READ_ON'
 384          * vendor command.
 385          * FIXME: set modem line control (how?)
 386          * Then read the modem line control and store values in
 387          * priv->line_state.
 388          */
 389         cfg.pktlen   = 5;
 390         cfg.baudrate = kl5kusb105a_sio_b9600;
 391         cfg.databits = kl5kusb105a_dtb_8;
 392         cfg.unknown1 = 0;
 393         cfg.unknown2 = 1;
 394         klsi_105_chg_port_settings(port, &cfg);
 395
 396         /* set up termios structure */
 397         spin_lock_irqsave (&priv->lock, flags);
 398         priv->termios.c_iflag = port->tty->termios->c_iflag;
 399         priv->termios.c_oflag = port->tty->termios->c_oflag;
 400         priv->termios.c_cflag = port->tty->termios->c_cflag;
 401         priv->termios.c_lflag = port->tty->termios->c_lflag;
 402         for (i=0; i<NCCS; i++)
 403                 priv->termios.c_cc[i] = port->tty->termios->c_cc[i];
 404         priv->cfg.pktlen   = cfg.pktlen;
 405         priv->cfg.baudrate = cfg.baudrate;
 406         priv->cfg.databits = cfg.databits;
 407         priv->cfg.unknown1 = cfg.unknown1;
 408         priv->cfg.unknown2 = cfg.unknown2;
 409         spin_unlock_irqrestore (&priv->lock, flags);
 410
 411         /* READ_ON and urb submission */
 412         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
 413                       usb_rcvbulkpipe(port->serial->dev,
 414                                       port->bulk_in_endpointAddress),
 415                       port->read_urb->transfer_buffer,
 416                       port->read_urb->transfer_buffer_length,
 417                       klsi_105_read_bulk_callback,
 418                       port);
 419
 420         rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
 421         if (rc) {
 422                 err("%s - failed submitting read urb, error %d", __FUNCTION__, rc);
 423                 retval = rc;
 424                 goto exit;
 425         }
 426
 427         rc = usb_control_msg(port->serial->dev,
 428                              usb_sndctrlpipe(port->serial->dev,0),
 429                              KL5KUSB105A_SIO_CONFIGURE,
 430                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 431                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 432                              0, /* index */
 433                              NULL,
 434                              0,
 435                              KLSI_TIMEOUT);
 436         if (rc < 0) {
 437                 err("Enabling read failed (error = %d)", rc);
 438                 retval = rc;
 439         } else
 440                 dbg("%s - enabled reading", __FUNCTION__);
 441
 442         rc = klsi_105_get_line_state(port, &line_state);
 443         if (rc >= 0) {
 444                 spin_lock_irqsave (&priv->lock, flags);
 445                 priv->line_state = line_state;
 446                 spin_unlock_irqrestore (&priv->lock, flags);
 447                 dbg("%s - read line state 0x%lx", __FUNCTION__, line_state);
 448                 retval = 0;
 449         } else
 450                 retval = rc;
 451
 452 exit:
 453         return retval;
 454 } /* klsi_105_open */
 455
 456
 457 static void klsi_105_close (struct usb_serial_port *port, struct file *filp)
 458 {
 459         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 460         int rc;
 461
 462         dbg("%s port %d", __FUNCTION__, port->number);
 463
 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         /* shutdown our bulk reads and writes */
 477         usb_kill_urb(port->write_urb);
 478         usb_kill_urb(port->read_urb);
 479         /* unlink our write pool */
 480         /* FIXME */
 481         /* wgg - do I need this? I think so. */
 482         usb_kill_urb(port->interrupt_in_urb);
 483         info("kl5kusb105 port stats: %ld bytes in, %ld bytes out", priv->bytes_in, priv->bytes_out);
 484 } /* klsi_105_close */
 485
 486
 487 /* We need to write a complete 64-byte data block and encode the
 488  * number actually sent in the first double-byte, LSB-order. That
 489  * leaves at most 62 bytes of payload.
 490  */
 491 #define KLSI_105_DATA_OFFSET    2   /* in the bulk urb data block */
 492
 493
 494 static int klsi_105_write (struct usb_serial_port *port,
 495                            const unsigned char *buf, int count)
 496 {
 497         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 498         int result, size;
 499         int bytes_sent=0;
 500
 501         dbg("%s - port %d", __FUNCTION__, port->number);
 502
 503         while (count > 0) {
 504                 /* try to find a free urb (write 0 bytes if none) */
 505                 struct urb *urb = NULL;
 506                 unsigned long flags;
 507                 int i;
 508                 /* since the pool is per-port we might not need the spin lock !? */
 509                 spin_lock_irqsave (&priv->lock, flags);
 510                 for (i=0; i<NUM_URBS; i++) {
 511                         if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
 512                                 urb = priv->write_urb_pool[i];
 513                                 dbg("%s - using pool URB %d", __FUNCTION__, i);
 514                                 break;
 515                         }
 516                 }
 517                 spin_unlock_irqrestore (&priv->lock, flags);
 518
 519                 if (urb==NULL) {
 520                         dbg("%s - no more free urbs", __FUNCTION__);
 521                         goto exit;
 522                 }
 523
 524                 if (urb->transfer_buffer == NULL) {
 525                         urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
 526                         if (urb->transfer_buffer == NULL) {
 527                                 err("%s - no more kernel memory...", __FUNCTION__);
 528                                 goto exit;
 529                         }
 530                 }
 531
 532                 size = min (count, port->bulk_out_size - KLSI_105_DATA_OFFSET);
 533                 size = min (size, URB_TRANSFER_BUFFER_SIZE - KLSI_105_DATA_OFFSET);
 534
 535                 memcpy (urb->transfer_buffer + KLSI_105_DATA_OFFSET, buf, size);
 536
 537                 /* write payload size into transfer buffer */
 538                 ((__u8 *)urb->transfer_buffer)[0] = (__u8) (size & 0xFF);
 539                 ((__u8 *)urb->transfer_buffer)[1] = (__u8) ((size & 0xFF00)>>8);
 540
 541                 /* set up our urb */
 542                 usb_fill_bulk_urb(urb, port->serial->dev,
 543                               usb_sndbulkpipe(port->serial->dev,
 544                                               port->bulk_out_endpointAddress),
 545                               urb->transfer_buffer,
 546                               URB_TRANSFER_BUFFER_SIZE,
 547                               klsi_105_write_bulk_callback,
 548                               port);
 549
 550                 /* send the data out the bulk port */
 551                 result = usb_submit_urb(urb, GFP_ATOMIC);
 552                 if (result) {
 553                         err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
 554                         goto exit;
 555                 }
 556                 buf += size;
 557                 bytes_sent += size;
 558                 count -= size;
 559         }
 560 exit:
 561         /* lockless, but it's for debug info only... */
 562         priv->bytes_out+=bytes_sent;
 563
 564         return bytes_sent;      /* that's how much we wrote */
 565 } /* klsi_105_write */
 566
 567 static void klsi_105_write_bulk_callback ( struct urb *urb)
 568 {
 569         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 570
 571         dbg("%s - port %d", __FUNCTION__, port->number);
 572
 573         if (urb->status) {
 574                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__,
 575                     urb->status);
 576                 return;
 577         }
 578
 579         usb_serial_port_softint(port);
 580 } /* klsi_105_write_bulk_completion_callback */
 581
 582
 583 /* return number of characters currently in the writing process */
 584 static int klsi_105_chars_in_buffer (struct usb_serial_port *port)
 585 {
 586         int chars = 0;
 587         int i;
 588         unsigned long flags;
 589         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 590
 591         spin_lock_irqsave (&priv->lock, flags);
 592
 593         for (i = 0; i < NUM_URBS; ++i) {
 594                 if (priv->write_urb_pool[i]->status == -EINPROGRESS) {
 595                         chars += URB_TRANSFER_BUFFER_SIZE;
 596                 }
 597         }
 598
 599         spin_unlock_irqrestore (&priv->lock, flags);
 600
 601         dbg("%s - returns %d", __FUNCTION__, chars);
 602         return (chars);
 603 }
 604
 605 static int klsi_105_write_room (struct usb_serial_port *port)
 606 {
 607         unsigned long flags;
 608         int i;
 609         int room = 0;
 610         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 611
 612         spin_lock_irqsave (&priv->lock, flags);
 613         for (i = 0; i < NUM_URBS; ++i) {
 614                 if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
 615                         room += URB_TRANSFER_BUFFER_SIZE;
 616                 }
 617         }
 618
 619         spin_unlock_irqrestore (&priv->lock, flags);
 620
 621         dbg("%s - returns %d", __FUNCTION__, room);
 622         return (room);
 623 }
 624
 625
 626
 627 static void klsi_105_read_bulk_callback (struct urb *urb)
 628 {
 629         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 630         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 631         struct tty_struct *tty;
 632         unsigned char *data = urb->transfer_buffer;
 633         int rc;
 634
 635         dbg("%s - port %d", __FUNCTION__, port->number);
 636
 637         /* The urb might have been killed. */
 638         if (urb->status) {
 639                 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__,
 640                     urb->status);
 641                 return;
 642         }
 643
 644         /* The data received is again preceded by a length double-byte in LSB-
 645          * first order (see klsi_105_write() )
 646          */
 647         if (urb->actual_length == 0) {
 648                 /* empty urbs seem to happen, we ignore them */
 649                 /* dbg("%s - emtpy URB", __FUNCTION__); */
 650                ;
 651         } else if (urb->actual_length <= 2) {
 652                 dbg("%s - size %d URB not understood", __FUNCTION__,
 653                     urb->actual_length);
 654                 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
 655                                       urb->actual_length, data);
 656         } else {
 657                 int bytes_sent = ((__u8 *) data)[0] +
 658                                  ((unsigned int) ((__u8 *) data)[1] << 8);
 659                 tty = port->tty;
 660                 /* we should immediately resubmit the URB, before attempting
 661                  * to pass the data on to the tty layer. But that needs locking
 662                  * against re-entry an then mixed-up data because of
 663                  * intermixed tty_flip_buffer_push()s
 664                  * FIXME
 665                  */
 666                 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
 667                                       urb->actual_length, data);
 668
 669                 if (bytes_sent + 2 > urb->actual_length) {
 670                         dbg("%s - trying to read more data than available"
 671                             " (%d vs. %d)", __FUNCTION__,
 672                             bytes_sent+2, urb->actual_length);
 673                         /* cap at implied limit */
 674                         bytes_sent = urb->actual_length - 2;
 675                 }
 676
 677                 tty_buffer_request_room(tty, bytes_sent);
 678                 tty_insert_flip_string(tty, data + 2, bytes_sent);
 679                 tty_flip_buffer_push(tty);
 680
 681                 /* again lockless, but debug info only */
 682                 priv->bytes_in += bytes_sent;
 683         }
 684         /* Continue trying to always read  */
 685         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
 686                       usb_rcvbulkpipe(port->serial->dev,
 687                                       port->bulk_in_endpointAddress),
 688                       port->read_urb->transfer_buffer,
 689                       port->read_urb->transfer_buffer_length,
 690                       klsi_105_read_bulk_callback,
 691                       port);
 692         rc = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 693         if (rc)
 694                 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, rc);
 695 } /* klsi_105_read_bulk_callback */
 696
 697
 698 static void klsi_105_set_termios (struct usb_serial_port *port,
 699                                   struct ktermios *old_termios)
 700 {
 701         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 702         unsigned int iflag = port->tty->termios->c_iflag;
 703         unsigned int old_iflag = old_termios->c_iflag;
 704         unsigned int cflag = port->tty->termios->c_cflag;
 705         unsigned int old_cflag = old_termios->c_cflag;
 706         struct klsi_105_port_settings cfg;
 707         unsigned long flags;
 708
 709         /* lock while we are modifying the settings */
 710         spin_lock_irqsave (&priv->lock, flags);
 711
 712         /*
 713          * Update baud rate
 714          */
 715         if( (cflag & CBAUD) != (old_cflag & CBAUD) ) {
 716                 /* reassert DTR and (maybe) RTS on transition from B0 */
 717                 if( (old_cflag & CBAUD) == B0 ) {
 718                         dbg("%s: baud was B0", __FUNCTION__);
 719 #if 0
 720                         priv->control_state |= TIOCM_DTR;
 721                         /* don't set RTS if using hardware flow control */
 722                         if (!(old_cflag & CRTSCTS)) {
 723                                 priv->control_state |= TIOCM_RTS;
 724                         }
 725                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 726 #endif
 727                 }
 728
 729                 switch(cflag & CBAUD) {
 730                 case B0: /* handled below */
 731                         break;
 732                 case B1200: priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 733                         break;
 734                 case B2400: priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 735                         break;
 736                 case B4800: priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 737                         break;
 738                 case B9600: priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 739                         break;
 740                 case B19200: priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 741                         break;
 742                 case B38400: priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 743                         break;
 744                 case B57600: priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 745                         break;
 746                 case B115200: priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 747                         break;
 748                 default:
 749                         err("KLSI USB->Serial converter:"
 750                             " unsupported baudrate request, using default"
 751                             " of 9600");
 752                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 753                         break;
 754                 }
 755                 if ((cflag & CBAUD) == B0 ) {
 756                         dbg("%s: baud is B0", __FUNCTION__);
 757                         /* Drop RTS and DTR */
 758                         /* maybe this should be simulated by sending read
 759                          * disable and read enable messages?
 760                          */
 761                         ;
 762 #if 0
 763                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 764                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 765 #endif
 766                 }
 767         }
 768
 769         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 770                 /* set the number of data bits */
 771                 switch (cflag & CSIZE) {
 772                 case CS5:
 773                         dbg("%s - 5 bits/byte not supported", __FUNCTION__);
 774                         spin_unlock_irqrestore (&priv->lock, flags);
 775                         return ;
 776                 case CS6:
 777                         dbg("%s - 6 bits/byte not supported", __FUNCTION__);
 778                         spin_unlock_irqrestore (&priv->lock, flags);
 779                         return ;
 780                 case CS7:
 781                         priv->cfg.databits = kl5kusb105a_dtb_7;
 782                         break;
 783                 case CS8:
 784                         priv->cfg.databits = kl5kusb105a_dtb_8;
 785                         break;
 786                 default:
 787                         err("CSIZE was not CS5-CS8, using default of 8");
 788                         priv->cfg.databits = kl5kusb105a_dtb_8;
 789                         break;
 790                 }
 791         }
 792
 793         /*
 794          * Update line control register (LCR)
 795          */
 796         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 797             || (cflag & CSTOPB) != (old_cflag & CSTOPB) ) {
 798
 799 #if 0
 800                 priv->last_lcr = 0;
 801
 802                 /* set the parity */
 803                 if (cflag & PARENB)
 804                         priv->last_lcr |= (cflag & PARODD) ?
 805                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 806                 else
 807                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 808
 809                 /* set the number of stop bits */
 810                 priv->last_lcr |= (cflag & CSTOPB) ?
 811                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 812
 813                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 814 #endif
 815                 ;
 816         }
 817
 818         /*
 819          * Set flow control: well, I do not really now how to handle DTR/RTS.
 820          * Just do what we have seen with SniffUSB on Win98.
 821          */
 822         if( (iflag & IXOFF) != (old_iflag & IXOFF)
 823             || (iflag & IXON) != (old_iflag & IXON)
 824             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS) ) {
 825
 826                 /* Drop DTR/RTS if no flow control otherwise assert */
 827 #if 0
 828                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS) )
 829                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 830                 else
 831                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 832                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 833 #endif
 834                 ;
 835         }
 836         memcpy (&cfg, &priv->cfg, sizeof(cfg));
 837         spin_unlock_irqrestore (&priv->lock, flags);
 838
 839         /* now commit changes to device */
 840         klsi_105_chg_port_settings(port, &cfg);
 841 } /* klsi_105_set_termios */
 842
 843
 844 #if 0
 845 static void mct_u232_break_ctl( struct usb_serial_port *port, int break_state )
 846 {
 847         struct usb_serial *serial = port->serial;
 848         struct mct_u232_private *priv = (struct mct_u232_private *)port->private;
 849         unsigned char lcr = priv->last_lcr;
 850
 851         dbg("%sstate=%d", __FUNCTION__, break_state);
 852
 853         if (break_state)
 854                 lcr |= MCT_U232_SET_BREAK;
 855
 856         mct_u232_set_line_ctrl(serial, lcr);
 857 } /* mct_u232_break_ctl */
 858 #endif
 859
 860 static int klsi_105_tiocmget (struct usb_serial_port *port, struct file *file)
 861 {
 862         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 863         unsigned long flags;
 864         int rc;
 865         unsigned long line_state;
 866         dbg("%s - request, just guessing", __FUNCTION__);
 867
 868         rc = klsi_105_get_line_state(port, &line_state);
 869         if (rc < 0) {
 870                 err("Reading line control failed (error = %d)", rc);
 871                 /* better return value? EAGAIN? */
 872                 return rc;
 873         }
 874
 875         spin_lock_irqsave (&priv->lock, flags);
 876         priv->line_state = line_state;
 877         spin_unlock_irqrestore (&priv->lock, flags);
 878         dbg("%s - read line state 0x%lx", __FUNCTION__, line_state);
 879         return (int)line_state;
 880 }
 881
 882 static int klsi_105_tiocmset (struct usb_serial_port *port, struct file *file,
 883                               unsigned int set, unsigned int clear)
 884 {
 885         int retval = -EINVAL;
 886
 887         dbg("%s", __FUNCTION__);
 888
 889 /* if this ever gets implemented, it should be done something like this:
 890         struct usb_serial *serial = port->serial;
 891         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 892         unsigned long flags;
 893         int control;
 894
 895         spin_lock_irqsave (&priv->lock, flags);
 896         if (set & TIOCM_RTS)
 897                 priv->control_state |= TIOCM_RTS;
 898         if (set & TIOCM_DTR)
 899                 priv->control_state |= TIOCM_DTR;
 900         if (clear & TIOCM_RTS)
 901                 priv->control_state &= ~TIOCM_RTS;
 902         if (clear & TIOCM_DTR)
 903                 priv->control_state &= ~TIOCM_DTR;
 904         control = priv->control_state;
 905         spin_unlock_irqrestore (&priv->lock, flags);
 906         retval = mct_u232_set_modem_ctrl(serial, control);
 907 */
 908         return retval;
 909 }
 910
 911 static void klsi_105_throttle (struct usb_serial_port *port)
 912 {
 913         dbg("%s - port %d", __FUNCTION__, port->number);
 914         usb_kill_urb(port->read_urb);
 915 }
 916
 917 static void klsi_105_unthrottle (struct usb_serial_port *port)
 918 {
 919         int result;
 920
 921         dbg("%s - port %d", __FUNCTION__, port->number);
 922
 923         port->read_urb->dev = port->serial->dev;
 924         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 925         if (result)
 926                 err("%s - failed submitting read urb, error %d", __FUNCTION__,
 927                     result);
 928 }
 929
 930
 931
 932 static int __init klsi_105_init (void)
 933 {
 934         int retval;
 935         retval = usb_serial_register(&kl5kusb105d_device);
 936         if (retval)
 937                 goto failed_usb_serial_register;
 938         retval = usb_register(&kl5kusb105d_driver);
 939         if (retval)
 940                 goto failed_usb_register;
 941
 942         info(DRIVER_DESC " " DRIVER_VERSION);
 943         return 0;
 944 failed_usb_register:
 945         usb_serial_deregister(&kl5kusb105d_device);
 946 failed_usb_serial_register:
 947         return retval;
 948 }
 949
 950
 951 static void __exit klsi_105_exit (void)
 952 {
 953         usb_deregister (&kl5kusb105d_driver);
 954         usb_serial_deregister (&kl5kusb105d_device);
 955 }
 956
 957
 958 module_init (klsi_105_init);
 959 module_exit (klsi_105_exit);
 960
 961 MODULE_AUTHOR( DRIVER_AUTHOR );
 962 MODULE_DESCRIPTION( DRIVER_DESC );
 963 MODULE_LICENSE("GPL");
 964
 965
 966 module_param(debug, bool, S_IRUGO | S_IWUSR);
 967 MODULE_PARM_DESC(debug, "enable extensive debugging messages");
 968
 969 /* vim: set sts=8 ts=8 sw=8: */