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 <linux/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 tty_struct *tty,
  78                         struct usb_serial_port *port, struct file *filp);
  79 static void klsi_105_close(struct tty_struct *tty,
  80                         struct usb_serial_port *port, struct file *filp);
  81 static int  klsi_105_write(struct tty_struct *tty,
  82         struct usb_serial_port *port, const unsigned char *buf, int count);
  83 static void klsi_105_write_bulk_callback(struct urb *urb);
  84 static int  klsi_105_chars_in_buffer(struct tty_struct *tty);
  85 static int  klsi_105_write_room(struct tty_struct *tty);
  86 static void klsi_105_read_bulk_callback(struct urb *urb);
  87 static void klsi_105_set_termios(struct tty_struct *tty,
  88                         struct usb_serial_port *port, struct ktermios *old);
  89 static void klsi_105_throttle(struct tty_struct *tty);
  90 static void klsi_105_unthrottle(struct tty_struct *tty);
  91 static int  klsi_105_tiocmget(struct tty_struct *tty, struct file *file);
  92 static int  klsi_105_tiocmset(struct tty_struct *tty, struct file *file,
  93                         unsigned int set, unsigned int clear);
  94
  95 /*
  96  * All of the device info needed for the KLSI converters.
  97  */
  98 static struct usb_device_id id_table [] = {
  99         { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
 100         { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
 101         { }             /* Terminating entry */
 102 };
 103
 104 MODULE_DEVICE_TABLE(usb, id_table);
 105
 106 static struct usb_driver kl5kusb105d_driver = {
 107         .name =         "kl5kusb105d",
 108         .probe =        usb_serial_probe,
 109         .disconnect =   usb_serial_disconnect,
 110         .id_table =     id_table,
 111         .no_dynamic_id =        1,
 112 };
 113
 114 static struct usb_serial_driver kl5kusb105d_device = {
 115         .driver = {
 116                 .owner =        THIS_MODULE,
 117                 .name =         "kl5kusb105d",
 118         },
 119         .description =       "KL5KUSB105D / PalmConnect",
 120         .usb_driver =        &kl5kusb105d_driver,
 121         .id_table =          id_table,
 122         .num_ports =         1,
 123         .open =              klsi_105_open,
 124         .close =             klsi_105_close,
 125         .write =             klsi_105_write,
 126         .write_bulk_callback = klsi_105_write_bulk_callback,
 127         .chars_in_buffer =   klsi_105_chars_in_buffer,
 128         .write_room =        klsi_105_write_room,
 129         .read_bulk_callback = klsi_105_read_bulk_callback,
 130         .set_termios =       klsi_105_set_termios,
 131         /*.break_ctl =       klsi_105_break_ctl,*/
 132         .tiocmget =          klsi_105_tiocmget,
 133         .tiocmset =          klsi_105_tiocmset,
 134         .attach =            klsi_105_startup,
 135         .shutdown =          klsi_105_shutdown,
 136         .throttle =          klsi_105_throttle,
 137         .unthrottle =        klsi_105_unthrottle,
 138 };
 139
 140 struct klsi_105_port_settings {
 141         __u8    pktlen;         /* always 5, it seems */
 142         __u8    baudrate;
 143         __u8    databits;
 144         __u8    unknown1;
 145         __u8    unknown2;
 146 } __attribute__ ((packed));
 147
 148 /* we implement a pool of NUM_URBS urbs per usb_serial */
 149 #define NUM_URBS                        1
 150 #define URB_TRANSFER_BUFFER_SIZE        64
 151 struct klsi_105_private {
 152         struct klsi_105_port_settings   cfg;
 153         struct ktermios                 termios;
 154         unsigned long                   line_state; /* modem line settings */
 155         /* write pool */
 156         struct urb                      *write_urb_pool[NUM_URBS];
 157         spinlock_t                      lock;
 158         unsigned long                   bytes_in;
 159         unsigned long                   bytes_out;
 160 };
 161
 162
 163 /*
 164  * Handle vendor specific USB requests
 165  */
 166
 167
 168 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 169
 170 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 171                                       struct klsi_105_port_settings *settings)
 172 {
 173         int rc;
 174
 175         rc = usb_control_msg(port->serial->dev,
 176                         usb_sndctrlpipe(port->serial->dev, 0),
 177                         KL5KUSB105A_SIO_SET_DATA,
 178                         USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 179                         0, /* value */
 180                         0, /* index */
 181                         settings,
 182                         sizeof(struct klsi_105_port_settings),
 183                         KLSI_TIMEOUT);
 184         if (rc < 0)
 185                 err("Change port settings failed (error = %d)", rc);
 186         info("%s - %d byte block, baudrate %x, databits %d, u1 %d, u2 %d",
 187             __func__,
 188             settings->pktlen,
 189             settings->baudrate, settings->databits,
 190             settings->unknown1, settings->unknown2);
 191         return rc;
 192 } /* klsi_105_chg_port_settings */
 193
 194 /* translate a 16-bit status value from the device to linux's TIO bits */
 195 static unsigned long klsi_105_status2linestate(const __u16 status)
 196 {
 197         unsigned long res = 0;
 198
 199         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 200               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 201               ;
 202
 203         return res;
 204 }
 205 /*
 206  * Read line control via vendor command and return result through
 207  * *line_state_p
 208  */
 209 /* It seems that the status buffer has always only 2 bytes length */
 210 #define KLSI_STATUSBUF_LEN      2
 211 static int klsi_105_get_line_state(struct usb_serial_port *port,
 212                                    unsigned long *line_state_p)
 213 {
 214         int rc;
 215         __u8 status_buf[KLSI_STATUSBUF_LEN] = { -1, -1};
 216         __u16 status;
 217
 218         info("%s - sending SIO Poll request", __func__);
 219         rc = usb_control_msg(port->serial->dev,
 220                              usb_rcvctrlpipe(port->serial->dev, 0),
 221                              KL5KUSB105A_SIO_POLL,
 222                              USB_TYPE_VENDOR | USB_DIR_IN,
 223                              0, /* value */
 224                              0, /* index */
 225                              status_buf, KLSI_STATUSBUF_LEN,
 226                              10000
 227                              );
 228         if (rc < 0)
 229                 err("Reading line status failed (error = %d)", rc);
 230         else {
 231                 status = get_unaligned_le16(status_buf);
 232
 233                 info("%s - read status %x %x", __func__,
 234                      status_buf[0], status_buf[1]);
 235
 236                 *line_state_p = klsi_105_status2linestate(status);
 237         }
 238         return rc;
 239 }
 240
 241
 242 /*
 243  * Driver's tty interface functions
 244  */
 245
 246 static int klsi_105_startup(struct usb_serial *serial)
 247 {
 248         struct klsi_105_private *priv;
 249         int i, j;
 250
 251         /* check if we support the product id (see keyspan.c)
 252          * FIXME
 253          */
 254
 255         /* allocate the private data structure */
 256         for (i = 0; i < serial->num_ports; i++) {
 257                 priv = kmalloc(sizeof(struct klsi_105_private),
 258                                                    GFP_KERNEL);
 259                 if (!priv) {
 260                         dbg("%skmalloc for klsi_105_private failed.", __func__);
 261                         i--;
 262                         goto err_cleanup;
 263                 }
 264                 /* set initial values for control structures */
 265                 priv->cfg.pktlen    = 5;
 266                 priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 267                 priv->cfg.databits  = kl5kusb105a_dtb_8;
 268                 priv->cfg.unknown1  = 0;
 269                 priv->cfg.unknown2  = 1;
 270
 271                 priv->line_state    = 0;
 272
 273                 priv->bytes_in      = 0;
 274                 priv->bytes_out     = 0;
 275                 usb_set_serial_port_data(serial->port[i], priv);
 276
 277                 spin_lock_init(&priv->lock);
 278                 for (j = 0; j < NUM_URBS; j++) {
 279                         struct urb *urb = usb_alloc_urb(0, GFP_KERNEL);
 280
 281                         priv->write_urb_pool[j] = urb;
 282                         if (urb == NULL) {
 283                                 err("No more urbs???");
 284                                 goto err_cleanup;
 285                         }
 286
 287                         urb->transfer_buffer =
 288                                 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
 289                         if (!urb->transfer_buffer) {
 290                                 err("%s - out of memory for urb buffers.",
 291                                                                 __func__);
 292                                 goto err_cleanup;
 293                         }
 294                 }
 295
 296                 /* priv->termios is left uninitalized until port opening */
 297                 init_waitqueue_head(&serial->port[i]->write_wait);
 298         }
 299
 300         return 0;
 301
 302 err_cleanup:
 303         for (; i >= 0; i--) {
 304                 priv = usb_get_serial_port_data(serial->port[i]);
 305                 for (j = 0; j < NUM_URBS; j++) {
 306                         if (priv->write_urb_pool[j]) {
 307                                 kfree(priv->write_urb_pool[j]->transfer_buffer);
 308                                 usb_free_urb(priv->write_urb_pool[j]);
 309                         }
 310                 }
 311                 usb_set_serial_port_data(serial->port[i], NULL);
 312         }
 313         return -ENOMEM;
 314 } /* klsi_105_startup */
 315
 316
 317 static void klsi_105_shutdown(struct usb_serial *serial)
 318 {
 319         int i;
 320
 321         dbg("%s", __func__);
 322
 323         /* stop reads and writes on all ports */
 324         for (i = 0; i < serial->num_ports; ++i) {
 325                 struct klsi_105_private *priv =
 326                                 usb_get_serial_port_data(serial->port[i]);
 327                 unsigned long flags;
 328
 329                 if (priv) {
 330                         /* kill our write urb pool */
 331                         int j;
 332                         struct urb **write_urbs = priv->write_urb_pool;
 333                         spin_lock_irqsave(&priv->lock, flags);
 334
 335                         for (j = 0; j < NUM_URBS; j++) {
 336                                 if (write_urbs[j]) {
 337                                         /* FIXME - uncomment the following
 338                                          * usb_kill_urb call when the host
 339                                          * controllers get fixed to set
 340                                          * urb->dev = NULL after the urb is
 341                                          * finished.  Otherwise this call
 342                                          * oopses. */
 343                                         /* usb_kill_urb(write_urbs[j]); */
 344                                         kfree(write_urbs[j]->transfer_buffer);
 345                                         usb_free_urb(write_urbs[j]);
 346                                 }
 347                         }
 348                         spin_unlock_irqrestore(&priv->lock, flags);
 349                         kfree(priv);
 350                         usb_set_serial_port_data(serial->port[i], NULL);
 351                 }
 352         }
 353 } /* klsi_105_shutdown */
 354
 355 static int  klsi_105_open(struct tty_struct *tty,
 356                         struct usb_serial_port *port, struct file *filp)
 357 {
 358         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 359         int retval = 0;
 360         int rc;
 361         int i;
 362         unsigned long line_state;
 363         struct klsi_105_port_settings cfg;
 364         unsigned long flags;
 365
 366         dbg("%s port %d", __func__, port->number);
 367
 368         /* force low_latency on so that our tty_push actually forces
 369          * the data through
 370          * tty->low_latency = 1; */
 371
 372         /* Do a defined restart:
 373          * Set up sane default baud rate and send the 'READ_ON'
 374          * vendor command.
 375          * FIXME: set modem line control (how?)
 376          * Then read the modem line control and store values in
 377          * priv->line_state.
 378          */
 379         cfg.pktlen   = 5;
 380         cfg.baudrate = kl5kusb105a_sio_b9600;
 381         cfg.databits = kl5kusb105a_dtb_8;
 382         cfg.unknown1 = 0;
 383         cfg.unknown2 = 1;
 384         klsi_105_chg_port_settings(port, &cfg);
 385
 386         /* set up termios structure */
 387         spin_lock_irqsave(&priv->lock, flags);
 388         priv->termios.c_iflag = tty->termios->c_iflag;
 389         priv->termios.c_oflag = tty->termios->c_oflag;
 390         priv->termios.c_cflag = tty->termios->c_cflag;
 391         priv->termios.c_lflag = tty->termios->c_lflag;
 392         for (i = 0; i < NCCS; i++)
 393                 priv->termios.c_cc[i] = tty->termios->c_cc[i];
 394         priv->cfg.pktlen   = cfg.pktlen;
 395         priv->cfg.baudrate = cfg.baudrate;
 396         priv->cfg.databits = cfg.databits;
 397         priv->cfg.unknown1 = cfg.unknown1;
 398         priv->cfg.unknown2 = cfg.unknown2;
 399         spin_unlock_irqrestore(&priv->lock, flags);
 400
 401         /* READ_ON and urb submission */
 402         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
 403                       usb_rcvbulkpipe(port->serial->dev,
 404                                       port->bulk_in_endpointAddress),
 405                       port->read_urb->transfer_buffer,
 406                       port->read_urb->transfer_buffer_length,
 407                       klsi_105_read_bulk_callback,
 408                       port);
 409
 410         rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
 411         if (rc) {
 412                 err("%s - failed submitting read urb, error %d", __func__, rc);
 413                 retval = rc;
 414                 goto exit;
 415         }
 416
 417         rc = usb_control_msg(port->serial->dev,
 418                              usb_sndctrlpipe(port->serial->dev, 0),
 419                              KL5KUSB105A_SIO_CONFIGURE,
 420                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 421                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 422                              0, /* index */
 423                              NULL,
 424                              0,
 425                              KLSI_TIMEOUT);
 426         if (rc < 0) {
 427                 err("Enabling read failed (error = %d)", rc);
 428                 retval = rc;
 429         } else
 430                 dbg("%s - enabled reading", __func__);
 431
 432         rc = klsi_105_get_line_state(port, &line_state);
 433         if (rc >= 0) {
 434                 spin_lock_irqsave(&priv->lock, flags);
 435                 priv->line_state = line_state;
 436                 spin_unlock_irqrestore(&priv->lock, flags);
 437                 dbg("%s - read line state 0x%lx", __func__, line_state);
 438                 retval = 0;
 439         } else
 440                 retval = rc;
 441
 442 exit:
 443         return retval;
 444 } /* klsi_105_open */
 445
 446
 447 static void klsi_105_close(struct tty_struct *tty,
 448                         struct usb_serial_port *port, struct file *filp)
 449 {
 450         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 451         int rc;
 452
 453         dbg("%s port %d", __func__, port->number);
 454
 455         mutex_lock(&port->serial->disc_mutex);
 456         if (!port->serial->disconnected) {
 457                 /* send READ_OFF */
 458                 rc = usb_control_msg(port->serial->dev,
 459                                      usb_sndctrlpipe(port->serial->dev, 0),
 460                                      KL5KUSB105A_SIO_CONFIGURE,
 461                                      USB_TYPE_VENDOR | USB_DIR_OUT,
 462                                      KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 463                                      0, /* index */
 464                                      NULL, 0,
 465                                      KLSI_TIMEOUT);
 466                 if (rc < 0)
 467                         err("Disabling read failed (error = %d)", rc);
 468         }
 469         mutex_unlock(&port->serial->disc_mutex);
 470
 471         /* shutdown our bulk reads and writes */
 472         usb_kill_urb(port->write_urb);
 473         usb_kill_urb(port->read_urb);
 474         /* unlink our write pool */
 475         /* FIXME */
 476         /* wgg - do I need this? I think so. */
 477         usb_kill_urb(port->interrupt_in_urb);
 478         info("kl5kusb105 port stats: %ld bytes in, %ld bytes out",
 479                                         priv->bytes_in, priv->bytes_out);
 480 } /* klsi_105_close */
 481
 482
 483 /* We need to write a complete 64-byte data block and encode the
 484  * number actually sent in the first double-byte, LSB-order. That
 485  * leaves at most 62 bytes of payload.
 486  */
 487 #define KLSI_105_DATA_OFFSET    2   /* in the bulk urb data block */
 488
 489
 490 static int klsi_105_write(struct tty_struct *tty,
 491         struct usb_serial_port *port, const unsigned char *buf, int count)
 492 {
 493         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 494         int result, size;
 495         int bytes_sent = 0;
 496
 497         dbg("%s - port %d", __func__, port->number);
 498
 499         while (count > 0) {
 500                 /* try to find a free urb (write 0 bytes if none) */
 501                 struct urb *urb = NULL;
 502                 unsigned long flags;
 503                 int i;
 504                 /* since the pool is per-port we might not need
 505                    the spin lock !? */
 506                 spin_lock_irqsave(&priv->lock, flags);
 507                 for (i = 0; i < NUM_URBS; i++) {
 508                         if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
 509                                 urb = priv->write_urb_pool[i];
 510                                 dbg("%s - using pool URB %d", __func__, i);
 511                                 break;
 512                         }
 513                 }
 514                 spin_unlock_irqrestore(&priv->lock, flags);
 515
 516                 if (urb == NULL) {
 517                         dbg("%s - no more free urbs", __func__);
 518                         goto exit;
 519                 }
 520
 521                 if (urb->transfer_buffer == NULL) {
 522                         urb->transfer_buffer =
 523                                 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
 524                         if (urb->transfer_buffer == NULL) {
 525                                 err("%s - no more kernel memory...", __func__);
 526                                 goto exit;
 527                         }
 528                 }
 529
 530                 size = min(count, port->bulk_out_size - KLSI_105_DATA_OFFSET);
 531                 size = min(size, URB_TRANSFER_BUFFER_SIZE -
 532                                                         KLSI_105_DATA_OFFSET);
 533
 534                 memcpy(urb->transfer_buffer + KLSI_105_DATA_OFFSET, buf, size);
 535
 536                 /* write payload size into transfer buffer */
 537                 ((__u8 *)urb->transfer_buffer)[0] = (__u8) (size & 0xFF);
 538                 ((__u8 *)urb->transfer_buffer)[1] = (__u8) ((size & 0xFF00)>>8);
 539
 540                 /* set up our urb */
 541                 usb_fill_bulk_urb(urb, port->serial->dev,
 542                               usb_sndbulkpipe(port->serial->dev,
 543                                               port->bulk_out_endpointAddress),
 544                               urb->transfer_buffer,
 545                               URB_TRANSFER_BUFFER_SIZE,
 546                               klsi_105_write_bulk_callback,
 547                               port);
 548
 549                 /* send the data out the bulk port */
 550                 result = usb_submit_urb(urb, GFP_ATOMIC);
 551                 if (result) {
 552                         err("%s - failed submitting write urb, error %d",
 553                                                         __func__, 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 = urb->context;
 570         int status = urb->status;
 571
 572         dbg("%s - port %d", __func__, port->number);
 573
 574         if (status) {
 575                 dbg("%s - nonzero write bulk status received: %d", __func__,
 576                     status);
 577                 return;
 578         }
 579
 580         usb_serial_port_softint(port);
 581 } /* klsi_105_write_bulk_completion_callback */
 582
 583
 584 /* return number of characters currently in the writing process */
 585 static int klsi_105_chars_in_buffer(struct tty_struct *tty)
 586 {
 587         struct usb_serial_port *port = tty->driver_data;
 588         int chars = 0;
 589         int i;
 590         unsigned long flags;
 591         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 592
 593         spin_lock_irqsave(&priv->lock, flags);
 594
 595         for (i = 0; i < NUM_URBS; ++i) {
 596                 if (priv->write_urb_pool[i]->status == -EINPROGRESS)
 597                         chars += URB_TRANSFER_BUFFER_SIZE;
 598         }
 599
 600         spin_unlock_irqrestore(&priv->lock, flags);
 601
 602         dbg("%s - returns %d", __func__, chars);
 603         return chars;
 604 }
 605
 606 static int klsi_105_write_room(struct tty_struct *tty)
 607 {
 608         struct usb_serial_port *port = tty->driver_data;
 609         unsigned long flags;
 610         int i;
 611         int room = 0;
 612         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 613
 614         spin_lock_irqsave(&priv->lock, flags);
 615         for (i = 0; i < NUM_URBS; ++i) {
 616                 if (priv->write_urb_pool[i]->status != -EINPROGRESS)
 617                         room += URB_TRANSFER_BUFFER_SIZE;
 618         }
 619
 620         spin_unlock_irqrestore(&priv->lock, flags);
 621
 622         dbg("%s - returns %d", __func__, room);
 623         return room;
 624 }
 625
 626
 627
 628 static void klsi_105_read_bulk_callback(struct urb *urb)
 629 {
 630         struct usb_serial_port *port = urb->context;
 631         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 632         struct tty_struct *tty;
 633         unsigned char *data = urb->transfer_buffer;
 634         int rc;
 635         int status = urb->status;
 636
 637         dbg("%s - port %d", __func__, port->number);
 638
 639         /* The urb might have been killed. */
 640         if (status) {
 641                 dbg("%s - nonzero read bulk status received: %d", __func__,
 642                     status);
 643                 return;
 644         }
 645
 646         /* The data received is again preceded by a length double-byte in LSB-
 647          * first order (see klsi_105_write() )
 648          */
 649         if (urb->actual_length == 0) {
 650                 /* empty urbs seem to happen, we ignore them */
 651                 /* dbg("%s - emtpy URB", __func__); */
 652                ;
 653         } else if (urb->actual_length <= 2) {
 654                 dbg("%s - size %d URB not understood", __func__,
 655                     urb->actual_length);
 656                 usb_serial_debug_data(debug, &port->dev, __func__,
 657                                       urb->actual_length, data);
 658         } else {
 659                 int bytes_sent = ((__u8 *) data)[0] +
 660                                  ((unsigned int) ((__u8 *) data)[1] << 8);
 661                 tty = tty_port_tty_get(&port->port);
 662                 /* we should immediately resubmit the URB, before attempting
 663                  * to pass the data on to the tty layer. But that needs locking
 664                  * against re-entry an then mixed-up data because of
 665                  * intermixed tty_flip_buffer_push()s
 666                  * FIXME
 667                  */
 668                 usb_serial_debug_data(debug, &port->dev, __func__,
 669                                       urb->actual_length, data);
 670
 671                 if (bytes_sent + 2 > urb->actual_length) {
 672                         dbg("%s - trying to read more data than available"
 673                             " (%d vs. %d)", __func__,
 674                             bytes_sent+2, urb->actual_length);
 675                         /* cap at implied limit */
 676                         bytes_sent = urb->actual_length - 2;
 677                 }
 678
 679                 tty_buffer_request_room(tty, bytes_sent);
 680                 tty_insert_flip_string(tty, data + 2, bytes_sent);
 681                 tty_flip_buffer_push(tty);
 682                 tty_kref_put(tty);
 683
 684                 /* again lockless, but debug info only */
 685                 priv->bytes_in += bytes_sent;
 686         }
 687         /* Continue trying to always read  */
 688         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
 689                       usb_rcvbulkpipe(port->serial->dev,
 690                                       port->bulk_in_endpointAddress),
 691                       port->read_urb->transfer_buffer,
 692                       port->read_urb->transfer_buffer_length,
 693                       klsi_105_read_bulk_callback,
 694                       port);
 695         rc = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 696         if (rc)
 697                 err("%s - failed resubmitting read urb, error %d",
 698                                                         __func__, rc);
 699 } /* klsi_105_read_bulk_callback */
 700
 701
 702 static void klsi_105_set_termios(struct tty_struct *tty,
 703                                  struct usb_serial_port *port,
 704                                  struct ktermios *old_termios)
 705 {
 706         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 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                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 733 #endif
 734                 }
 735         }
 736         switch (baud) {
 737         case 0: /* handled below */
 738                 break;
 739         case 1200:
 740                 priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 741                 break;
 742         case 2400:
 743                 priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 744                 break;
 745         case 4800:
 746                 priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 747                 break;
 748         case 9600:
 749                 priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 750                 break;
 751         case 19200:
 752                 priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 753                 break;
 754         case 38400:
 755                 priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 756                 break;
 757         case 57600:
 758                 priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 759                 break;
 760         case 115200:
 761                 priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 762                 break;
 763         default:
 764                 dbg("KLSI USB->Serial converter:"
 765                     " unsupported baudrate request, using default of 9600");
 766                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 767                 baud = 9600;
 768                 break;
 769         }
 770         if ((cflag & CBAUD) == B0) {
 771                 dbg("%s: baud is B0", __func__);
 772                 /* Drop RTS and DTR */
 773                 /* maybe this should be simulated by sending read
 774                  * disable and read enable messages?
 775                  */
 776                 ;
 777 #if 0
 778                 priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 779                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 780 #endif
 781         }
 782         tty_encode_baud_rate(tty, baud, baud);
 783
 784         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 785                 /* set the number of data bits */
 786                 switch (cflag & CSIZE) {
 787                 case CS5:
 788                         dbg("%s - 5 bits/byte not supported", __func__);
 789                         spin_unlock_irqrestore(&priv->lock, flags);
 790                         return ;
 791                 case CS6:
 792                         dbg("%s - 6 bits/byte not supported", __func__);
 793                         spin_unlock_irqrestore(&priv->lock, flags);
 794                         return ;
 795                 case CS7:
 796                         priv->cfg.databits = kl5kusb105a_dtb_7;
 797                         break;
 798                 case CS8:
 799                         priv->cfg.databits = kl5kusb105a_dtb_8;
 800                         break;
 801                 default:
 802                         err("CSIZE was not CS5-CS8, using default of 8");
 803                         priv->cfg.databits = kl5kusb105a_dtb_8;
 804                         break;
 805                 }
 806         }
 807
 808         /*
 809          * Update line control register (LCR)
 810          */
 811         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 812             || (cflag & CSTOPB) != (old_cflag & CSTOPB)) {
 813                 /* Not currently supported */
 814                 tty->termios->c_cflag &= ~(PARENB|PARODD|CSTOPB);
 815 #if 0
 816                 priv->last_lcr = 0;
 817
 818                 /* set the parity */
 819                 if (cflag & PARENB)
 820                         priv->last_lcr |= (cflag & PARODD) ?
 821                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 822                 else
 823                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 824
 825                 /* set the number of stop bits */
 826                 priv->last_lcr |= (cflag & CSTOPB) ?
 827                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 828
 829                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 830 #endif
 831                 ;
 832         }
 833         /*
 834          * Set flow control: well, I do not really now how to handle DTR/RTS.
 835          * Just do what we have seen with SniffUSB on Win98.
 836          */
 837         if ((iflag & IXOFF) != (old_iflag & IXOFF)
 838             || (iflag & IXON) != (old_iflag & IXON)
 839             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS)) {
 840                 /* Not currently supported */
 841                 tty->termios->c_cflag &= ~CRTSCTS;
 842                 /* Drop DTR/RTS if no flow control otherwise assert */
 843 #if 0
 844                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS))
 845                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 846                 else
 847                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 848                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 849 #endif
 850                 ;
 851         }
 852         memcpy(&cfg, &priv->cfg, sizeof(cfg));
 853         spin_unlock_irqrestore(&priv->lock, flags);
 854
 855         /* now commit changes to device */
 856         klsi_105_chg_port_settings(port, &cfg);
 857 } /* klsi_105_set_termios */
 858
 859
 860 #if 0
 861 static void mct_u232_break_ctl(struct tty_struct *tty, int break_state)
 862 {
 863         struct usb_serial_port *port = tty->driver_data;
 864         struct usb_serial *serial = port->serial;
 865         struct mct_u232_private *priv =
 866                                 (struct mct_u232_private *)port->private;
 867         unsigned char lcr = priv->last_lcr;
 868
 869         dbg("%sstate=%d", __func__, break_state);
 870
 871         if (break_state)
 872                 lcr |= MCT_U232_SET_BREAK;
 873
 874         mct_u232_set_line_ctrl(serial, lcr);
 875 } /* mct_u232_break_ctl */
 876 #endif
 877
 878 static int klsi_105_tiocmget(struct tty_struct *tty, struct file *file)
 879 {
 880         struct usb_serial_port *port = tty->driver_data;
 881         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 882         unsigned long flags;
 883         int rc;
 884         unsigned long line_state;
 885         dbg("%s - request, just guessing", __func__);
 886
 887         rc = klsi_105_get_line_state(port, &line_state);
 888         if (rc < 0) {
 889                 err("Reading line control failed (error = %d)", rc);
 890                 /* better return value? EAGAIN? */
 891                 return rc;
 892         }
 893
 894         spin_lock_irqsave(&priv->lock, flags);
 895         priv->line_state = line_state;
 896         spin_unlock_irqrestore(&priv->lock, flags);
 897         dbg("%s - read line state 0x%lx", __func__, line_state);
 898         return (int)line_state;
 899 }
 900
 901 static int klsi_105_tiocmset(struct tty_struct *tty, struct file *file,
 902                              unsigned int set, unsigned int clear)
 903 {
 904         int retval = -EINVAL;
 905
 906         dbg("%s", __func__);
 907
 908 /* if this ever gets implemented, it should be done something like this:
 909         struct usb_serial *serial = port->serial;
 910         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 911         unsigned long flags;
 912         int control;
 913
 914         spin_lock_irqsave (&priv->lock, flags);
 915         if (set & TIOCM_RTS)
 916                 priv->control_state |= TIOCM_RTS;
 917         if (set & TIOCM_DTR)
 918                 priv->control_state |= TIOCM_DTR;
 919         if (clear & TIOCM_RTS)
 920                 priv->control_state &= ~TIOCM_RTS;
 921         if (clear & TIOCM_DTR)
 922                 priv->control_state &= ~TIOCM_DTR;
 923         control = priv->control_state;
 924         spin_unlock_irqrestore (&priv->lock, flags);
 925         retval = mct_u232_set_modem_ctrl(serial, control);
 926 */
 927         return retval;
 928 }
 929
 930 static void klsi_105_throttle(struct tty_struct *tty)
 931 {
 932         struct usb_serial_port *port = tty->driver_data;
 933         dbg("%s - port %d", __func__, port->number);
 934         usb_kill_urb(port->read_urb);
 935 }
 936
 937 static void klsi_105_unthrottle(struct tty_struct *tty)
 938 {
 939         struct usb_serial_port *port = tty->driver_data;
 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: */