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/config.h>
  49 #include <linux/kernel.h>
  50 #include <linux/errno.h>
  51 #include <linux/init.h>
  52 #include <linux/slab.h>
  53 #include <linux/tty.h>
  54 #include <linux/tty_driver.h>
  55 #include <linux/tty_flip.h>
  56 #include <linux/module.h>
  57 #include <asm/uaccess.h>
  58 #include <linux/usb.h>
  59 #include "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, struct pt_regs *regs);
  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, struct pt_regs *regs);
  89 static void klsi_105_set_termios         (struct usb_serial_port *port,
  90                                           struct termios * old);
  91 static int  klsi_105_ioctl               (struct usb_serial_port *port,
  92                                           struct file * file,
  93                                           unsigned int cmd,
  94                                           unsigned long arg);
  95 static void klsi_105_throttle            (struct usb_serial_port *port);
  96 static void klsi_105_unthrottle          (struct usb_serial_port *port);
  97 /*
  98 static void klsi_105_break_ctl           (struct usb_serial_port *port,
  99                                           int break_state );
 100  */
 101 static int  klsi_105_tiocmget            (struct usb_serial_port *port,
 102                                           struct file *file);
 103 static int  klsi_105_tiocmset            (struct usb_serial_port *port,
 104                                           struct file *file, unsigned int set,
 105                                           unsigned int clear);
 106
 107 /*
 108  * All of the device info needed for the KLSI converters.
 109  */
 110 static struct usb_device_id id_table [] = {
 111         { USB_DEVICE(PALMCONNECT_VID, PALMCONNECT_PID) },
 112         { USB_DEVICE(KLSI_VID, KLSI_KL5KUSB105D_PID) },
 113         { }             /* Terminating entry */
 114 };
 115
 116 MODULE_DEVICE_TABLE (usb, id_table);
 117
 118 static struct usb_driver kl5kusb105d_driver = {
 119         .owner =        THIS_MODULE,
 120         .name =         "kl5kusb105d",
 121         .probe =        usb_serial_probe,
 122         .disconnect =   usb_serial_disconnect,
 123         .id_table =     id_table,
 124 };
 125
 126 static struct usb_serial_device_type kl5kusb105d_device = {
 127         .owner =             THIS_MODULE,
 128         .name =              "KL5KUSB105D / PalmConnect",
 129         .short_name =        "kl5kusb105d",
 130         .id_table =          id_table,
 131         .num_interrupt_in =  1,
 132         .num_bulk_in =       1,
 133         .num_bulk_out =      1,
 134         .num_ports =         1,
 135         .open =              klsi_105_open,
 136         .close =             klsi_105_close,
 137         .write =             klsi_105_write,
 138         .write_bulk_callback = klsi_105_write_bulk_callback,
 139         .chars_in_buffer =   klsi_105_chars_in_buffer,
 140         .write_room =        klsi_105_write_room,
 141         .read_bulk_callback =klsi_105_read_bulk_callback,
 142         .ioctl =             klsi_105_ioctl,
 143         .set_termios =       klsi_105_set_termios,
 144         /*.break_ctl =       klsi_105_break_ctl,*/
 145         .tiocmget =          klsi_105_tiocmget,
 146         .tiocmset =          klsi_105_tiocmset,
 147         .attach =            klsi_105_startup,
 148         .shutdown =          klsi_105_shutdown,
 149         .throttle =          klsi_105_throttle,
 150         .unthrottle =        klsi_105_unthrottle,
 151 };
 152
 153 struct klsi_105_port_settings {
 154         __u8    pktlen;         /* always 5, it seems */
 155         __u8    baudrate;
 156         __u8    databits;
 157         __u8    unknown1;
 158         __u8    unknown2;
 159 } __attribute__ ((packed));
 160
 161 /* we implement a pool of NUM_URBS urbs per usb_serial */
 162 #define NUM_URBS                        1
 163 #define URB_TRANSFER_BUFFER_SIZE        64
 164 struct klsi_105_private {
 165         struct klsi_105_port_settings   cfg;
 166         struct termios                  termios;
 167         unsigned long                   line_state; /* modem line settings */
 168         /* write pool */
 169         struct urb *                    write_urb_pool[NUM_URBS];
 170         spinlock_t                      lock;
 171         unsigned long                   bytes_in;
 172         unsigned long                   bytes_out;
 173 };
 174
 175
 176 /*
 177  * Handle vendor specific USB requests
 178  */
 179
 180
 181 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 182
 183 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 184                                       struct klsi_105_port_settings *settings)
 185 {
 186         int rc;
 187
 188         rc = usb_control_msg(port->serial->dev,
 189                              usb_sndctrlpipe(port->serial->dev, 0),
 190                              KL5KUSB105A_SIO_SET_DATA,
 191                              USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 192                              0, /* value */
 193                              0, /* index */
 194                              settings,
 195                              sizeof(struct klsi_105_port_settings),
 196                              KLSI_TIMEOUT);
 197         if (rc < 0)
 198                 err("Change port settings failed (error = %d)", rc);
 199         info("%s - %d byte block, baudrate %x, databits %d, u1 %d, u2 %d",
 200             __FUNCTION__,
 201             settings->pktlen,
 202             settings->baudrate, settings->databits,
 203             settings->unknown1, settings->unknown2);
 204         return rc;
 205 } /* klsi_105_chg_port_settings */
 206
 207 /* translate a 16-bit status value from the device to linux's TIO bits */
 208 static unsigned long klsi_105_status2linestate(const __u16 status)
 209 {
 210         unsigned long res = 0;
 211
 212         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 213               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 214               ;
 215
 216         return res;
 217 }
 218 /*
 219  * Read line control via vendor command and return result through
 220  * *line_state_p
 221  */
 222 /* It seems that the status buffer has always only 2 bytes length */
 223 #define KLSI_STATUSBUF_LEN      2
 224 static int klsi_105_get_line_state(struct usb_serial_port *port,
 225                                    unsigned long *line_state_p)
 226 {
 227         int rc;
 228         __u8 status_buf[KLSI_STATUSBUF_LEN] = { -1,-1};
 229         __u16 status;
 230
 231         info("%s - sending SIO Poll request", __FUNCTION__);
 232         rc = usb_control_msg(port->serial->dev,
 233                              usb_rcvctrlpipe(port->serial->dev, 0),
 234                              KL5KUSB105A_SIO_POLL,
 235                              USB_TYPE_VENDOR | USB_DIR_IN,
 236                              0, /* value */
 237                              0, /* index */
 238                              status_buf, KLSI_STATUSBUF_LEN,
 239                              10000
 240                              );
 241         if (rc < 0)
 242                 err("Reading line status failed (error = %d)", rc);
 243         else {
 244                 status = status_buf[0] + (status_buf[1]<<8);
 245
 246                 info("%s - read status %x %x", __FUNCTION__,
 247                      status_buf[0], status_buf[1]);
 248
 249                 *line_state_p = klsi_105_status2linestate(status);
 250         }
 251
 252         return rc;
 253 }
 254
 255
 256 /*
 257  * Driver's tty interface functions
 258  */
 259
 260 static int klsi_105_startup (struct usb_serial *serial)
 261 {
 262         struct klsi_105_private *priv;
 263         int i;
 264
 265         /* check if we support the product id (see keyspan.c)
 266          * FIXME
 267          */
 268
 269         /* allocate the private data structure */
 270         for (i=0; i<serial->num_ports; i++) {
 271                 int j;
 272                 priv = kmalloc(sizeof(struct klsi_105_private),
 273                                                    GFP_KERNEL);
 274                 if (!priv) {
 275                         dbg("%skmalloc for klsi_105_private failed.", __FUNCTION__);
 276                         return -ENOMEM;
 277                 }
 278                 /* set initial values for control structures */
 279                 priv->cfg.pktlen    = 5;
 280                 priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 281                 priv->cfg.databits  = kl5kusb105a_dtb_8;
 282                 priv->cfg.unknown1  = 0;
 283                 priv->cfg.unknown2  = 1;
 284
 285                 priv->line_state    = 0;
 286
 287                 priv->bytes_in      = 0;
 288                 priv->bytes_out     = 0;
 289                 usb_set_serial_port_data(serial->port[i], priv);
 290
 291                 spin_lock_init (&priv->lock);
 292                 for (j=0; j<NUM_URBS; j++) {
 293                         struct urb* urb = usb_alloc_urb(0, GFP_KERNEL);
 294
 295                         priv->write_urb_pool[j] = urb;
 296                         if (urb == NULL) {
 297                                 err("No more urbs???");
 298                                 continue;
 299                         }
 300
 301                         urb->transfer_buffer = NULL;
 302                         urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE,
 303                                                         GFP_KERNEL);
 304                         if (!urb->transfer_buffer) {
 305                                 err("%s - out of memory for urb buffers.", __FUNCTION__);
 306                                 continue;
 307                         }
 308                 }
 309
 310                 /* priv->termios is left uninitalized until port opening */
 311                 init_waitqueue_head(&serial->port[i]->write_wait);
 312         }
 313
 314         return (0);
 315 } /* klsi_105_startup */
 316
 317
 318 static void klsi_105_shutdown (struct usb_serial *serial)
 319 {
 320         int i;
 321
 322         dbg("%s", __FUNCTION__);
 323
 324         /* stop reads and writes on all ports */
 325         for (i=0; i < serial->num_ports; ++i) {
 326                 struct klsi_105_private *priv = 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
 349                         spin_unlock_irqrestore (&priv->lock, flags);
 350
 351                         kfree(priv);
 352                         usb_set_serial_port_data(serial->port[i], NULL);
 353                 }
 354         }
 355 } /* klsi_105_shutdown */
 356
 357 static int  klsi_105_open (struct usb_serial_port *port, struct file *filp)
 358 {
 359         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 360         int retval = 0;
 361         int rc;
 362         int i;
 363         unsigned long line_state;
 364         struct klsi_105_port_settings cfg;
 365         unsigned long flags;
 366
 367         dbg("%s port %d", __FUNCTION__, port->number);
 368
 369         /* force low_latency on so that our tty_push actually forces
 370          * the data through
 371          * port->tty->low_latency = 1; */
 372
 373         /* Do a defined restart:
 374          * Set up sane default baud rate and send the 'READ_ON'
 375          * vendor command.
 376          * FIXME: set modem line control (how?)
 377          * Then read the modem line control and store values in
 378          * priv->line_state.
 379          */
 380         cfg.pktlen   = 5;
 381         cfg.baudrate = kl5kusb105a_sio_b9600;
 382         cfg.databits = kl5kusb105a_dtb_8;
 383         cfg.unknown1 = 0;
 384         cfg.unknown2 = 1;
 385         klsi_105_chg_port_settings(port, &cfg);
 386
 387         /* set up termios structure */
 388         spin_lock_irqsave (&priv->lock, flags);
 389         priv->termios.c_iflag = port->tty->termios->c_iflag;
 390         priv->termios.c_oflag = port->tty->termios->c_oflag;
 391         priv->termios.c_cflag = port->tty->termios->c_cflag;
 392         priv->termios.c_lflag = port->tty->termios->c_lflag;
 393         for (i=0; i<NCCS; i++)
 394                 priv->termios.c_cc[i] = port->tty->termios->c_cc[i];
 395         priv->cfg.pktlen   = cfg.pktlen;
 396         priv->cfg.baudrate = cfg.baudrate;
 397         priv->cfg.databits = cfg.databits;
 398         priv->cfg.unknown1 = cfg.unknown1;
 399         priv->cfg.unknown2 = cfg.unknown2;
 400         spin_unlock_irqrestore (&priv->lock, flags);
 401
 402         /* READ_ON and urb submission */
 403         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
 404                       usb_rcvbulkpipe(port->serial->dev,
 405                                       port->bulk_in_endpointAddress),
 406                       port->read_urb->transfer_buffer,
 407                       port->read_urb->transfer_buffer_length,
 408                       klsi_105_read_bulk_callback,
 409                       port);
 410
 411         rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
 412         if (rc) {
 413                 err("%s - failed submitting read urb, error %d", __FUNCTION__, rc);
 414                 retval = rc;
 415                 goto exit;
 416         }
 417
 418         rc = usb_control_msg(port->serial->dev,
 419                              usb_sndctrlpipe(port->serial->dev,0),
 420                              KL5KUSB105A_SIO_CONFIGURE,
 421                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 422                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 423                              0, /* index */
 424                              NULL,
 425                              0,
 426                              KLSI_TIMEOUT);
 427         if (rc < 0) {
 428                 err("Enabling read failed (error = %d)", rc);
 429                 retval = rc;
 430         } else
 431                 dbg("%s - enabled reading", __FUNCTION__);
 432
 433         rc = klsi_105_get_line_state(port, &line_state);
 434         if (rc >= 0) {
 435                 spin_lock_irqsave (&priv->lock, flags);
 436                 priv->line_state = line_state;
 437                 spin_unlock_irqrestore (&priv->lock, flags);
 438                 dbg("%s - read line state 0x%lx", __FUNCTION__, line_state);
 439                 retval = 0;
 440         } else
 441                 retval = rc;
 442
 443 exit:
 444         return retval;
 445 } /* klsi_105_open */
 446
 447
 448 static void klsi_105_close (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", __FUNCTION__, port->number);
 454
 455         /* send READ_OFF */
 456         rc = usb_control_msg (port->serial->dev,
 457                               usb_sndctrlpipe(port->serial->dev, 0),
 458                               KL5KUSB105A_SIO_CONFIGURE,
 459                               USB_TYPE_VENDOR | USB_DIR_OUT,
 460                               KL5KUSB105A_SIO_CONFIGURE_READ_OFF,
 461                               0, /* index */
 462                               NULL, 0,
 463                               KLSI_TIMEOUT);
 464         if (rc < 0)
 465                     err("Disabling read failed (error = %d)", rc);
 466
 467         /* shutdown our bulk reads and writes */
 468         usb_kill_urb(port->write_urb);
 469         usb_kill_urb(port->read_urb);
 470         /* unlink our write pool */
 471         /* FIXME */
 472         /* wgg - do I need this? I think so. */
 473         usb_kill_urb(port->interrupt_in_urb);
 474         info("kl5kusb105 port stats: %ld bytes in, %ld bytes out", priv->bytes_in, priv->bytes_out);
 475 } /* klsi_105_close */
 476
 477
 478 /* We need to write a complete 64-byte data block and encode the
 479  * number actually sent in the first double-byte, LSB-order. That
 480  * leaves at most 62 bytes of payload.
 481  */
 482 #define KLSI_105_DATA_OFFSET    2   /* in the bulk urb data block */
 483
 484
 485 static int klsi_105_write (struct usb_serial_port *port,
 486                            const unsigned char *buf, int count)
 487 {
 488         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 489         int result, size;
 490         int bytes_sent=0;
 491
 492         dbg("%s - port %d", __FUNCTION__, port->number);
 493
 494         while (count > 0) {
 495                 /* try to find a free urb (write 0 bytes if none) */
 496                 struct urb *urb = NULL;
 497                 unsigned long flags;
 498                 int i;
 499                 /* since the pool is per-port we might not need the spin lock !? */
 500                 spin_lock_irqsave (&priv->lock, flags);
 501                 for (i=0; i<NUM_URBS; i++) {
 502                         if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
 503                                 urb = priv->write_urb_pool[i];
 504                                 dbg("%s - using pool URB %d", __FUNCTION__, i);
 505                                 break;
 506                         }
 507                 }
 508                 spin_unlock_irqrestore (&priv->lock, flags);
 509
 510                 if (urb==NULL) {
 511                         dbg("%s - no more free urbs", __FUNCTION__);
 512                         goto exit;
 513                 }
 514
 515                 if (urb->transfer_buffer == NULL) {
 516                         urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
 517                         if (urb->transfer_buffer == NULL) {
 518                                 err("%s - no more kernel memory...", __FUNCTION__);
 519                                 goto exit;
 520                         }
 521                 }
 522
 523                 size = min (count, port->bulk_out_size - KLSI_105_DATA_OFFSET);
 524                 size = min (size, URB_TRANSFER_BUFFER_SIZE - KLSI_105_DATA_OFFSET);
 525
 526                 memcpy (urb->transfer_buffer + KLSI_105_DATA_OFFSET, buf, size);
 527
 528                 /* write payload size into transfer buffer */
 529                 ((__u8 *)urb->transfer_buffer)[0] = (__u8) (size & 0xFF);
 530                 ((__u8 *)urb->transfer_buffer)[1] = (__u8) ((size & 0xFF00)>>8);
 531
 532                 /* set up our urb */
 533                 usb_fill_bulk_urb(urb, port->serial->dev,
 534                               usb_sndbulkpipe(port->serial->dev,
 535                                               port->bulk_out_endpointAddress),
 536                               urb->transfer_buffer,
 537                               URB_TRANSFER_BUFFER_SIZE,
 538                               klsi_105_write_bulk_callback,
 539                               port);
 540
 541                 /* send the data out the bulk port */
 542                 result = usb_submit_urb(urb, GFP_ATOMIC);
 543                 if (result) {
 544                         err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
 545                         goto exit;
 546                 }
 547                 buf += size;
 548                 bytes_sent += size;
 549                 count -= size;
 550         }
 551 exit:
 552         /* lockless, but it's for debug info only... */
 553         priv->bytes_out+=bytes_sent;
 554
 555         return bytes_sent;      /* that's how much we wrote */
 556 } /* klsi_105_write */
 557
 558 static void klsi_105_write_bulk_callback ( struct urb *urb, struct pt_regs *regs)
 559 {
 560         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 561
 562         dbg("%s - port %d", __FUNCTION__, port->number);
 563
 564         if (urb->status) {
 565                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__,
 566                     urb->status);
 567                 return;
 568         }
 569
 570         /* from generic_write_bulk_callback */
 571         schedule_work(&port->work);
 572 } /* klsi_105_write_bulk_completion_callback */
 573
 574
 575 /* return number of characters currently in the writing process */
 576 static int klsi_105_chars_in_buffer (struct usb_serial_port *port)
 577 {
 578         int chars = 0;
 579         int i;
 580         unsigned long flags;
 581         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 582
 583         spin_lock_irqsave (&priv->lock, flags);
 584
 585         for (i = 0; i < NUM_URBS; ++i) {
 586                 if (priv->write_urb_pool[i]->status == -EINPROGRESS) {
 587                         chars += URB_TRANSFER_BUFFER_SIZE;
 588                 }
 589         }
 590
 591         spin_unlock_irqrestore (&priv->lock, flags);
 592
 593         dbg("%s - returns %d", __FUNCTION__, chars);
 594         return (chars);
 595 }
 596
 597 static int klsi_105_write_room (struct usb_serial_port *port)
 598 {
 599         unsigned long flags;
 600         int i;
 601         int room = 0;
 602         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 603
 604         spin_lock_irqsave (&priv->lock, flags);
 605         for (i = 0; i < NUM_URBS; ++i) {
 606                 if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
 607                         room += URB_TRANSFER_BUFFER_SIZE;
 608                 }
 609         }
 610
 611         spin_unlock_irqrestore (&priv->lock, flags);
 612
 613         dbg("%s - returns %d", __FUNCTION__, room);
 614         return (room);
 615 }
 616
 617
 618
 619 static void klsi_105_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 620 {
 621         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 622         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 623         struct tty_struct *tty;
 624         unsigned char *data = urb->transfer_buffer;
 625         int rc;
 626
 627         dbg("%s - port %d", __FUNCTION__, port->number);
 628
 629         /* The urb might have been killed. */
 630         if (urb->status) {
 631                 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__,
 632                     urb->status);
 633                 return;
 634         }
 635
 636         /* The data received is again preceded by a length double-byte in LSB-
 637          * first order (see klsi_105_write() )
 638          */
 639         if (urb->actual_length == 0) {
 640                 /* empty urbs seem to happen, we ignore them */
 641                 /* dbg("%s - emtpy URB", __FUNCTION__); */
 642                ;
 643         } else if (urb->actual_length <= 2) {
 644                 dbg("%s - size %d URB not understood", __FUNCTION__,
 645                     urb->actual_length);
 646                 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
 647                                       urb->actual_length, data);
 648         } else {
 649                 int i;
 650                 int bytes_sent = ((__u8 *) data)[0] +
 651                                  ((unsigned int) ((__u8 *) data)[1] << 8);
 652                 tty = port->tty;
 653                 /* we should immediately resubmit the URB, before attempting
 654                  * to pass the data on to the tty layer. But that needs locking
 655                  * against re-entry an then mixed-up data because of
 656                  * intermixed tty_flip_buffer_push()s
 657                  * FIXME
 658                  */
 659                 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
 660                                       urb->actual_length, data);
 661
 662                 if (bytes_sent + 2 > urb->actual_length) {
 663                         dbg("%s - trying to read more data than available"
 664                             " (%d vs. %d)", __FUNCTION__,
 665                             bytes_sent+2, urb->actual_length);
 666                         /* cap at implied limit */
 667                         bytes_sent = urb->actual_length - 2;
 668                 }
 669
 670                 for (i = 2; i < 2+bytes_sent; i++) {
 671                         /* if we insert more than TTY_FLIPBUF_SIZE characters,
 672                          * we drop them. */
 673                         if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
 674                                 tty_flip_buffer_push(tty);
 675                         }
 676                         /* this doesn't actually push the data through unless
 677                          * tty->low_latency is set */
 678                         tty_insert_flip_char(tty, ((__u8*) data)[i], 0);
 679                 }
 680                 tty_flip_buffer_push(tty);
 681
 682                 /* again lockless, but debug info only */
 683                 priv->bytes_in += bytes_sent;
 684         }
 685         /* Continue trying to always read  */
 686         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
 687                       usb_rcvbulkpipe(port->serial->dev,
 688                                       port->bulk_in_endpointAddress),
 689                       port->read_urb->transfer_buffer,
 690                       port->read_urb->transfer_buffer_length,
 691                       klsi_105_read_bulk_callback,
 692                       port);
 693         rc = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 694         if (rc)
 695                 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, rc);
 696 } /* klsi_105_read_bulk_callback */
 697
 698
 699 static void klsi_105_set_termios (struct usb_serial_port *port,
 700                                   struct termios *old_termios)
 701 {
 702         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 703         unsigned int iflag = port->tty->termios->c_iflag;
 704         unsigned int old_iflag = old_termios->c_iflag;
 705         unsigned int cflag = port->tty->termios->c_cflag;
 706         unsigned int old_cflag = old_termios->c_cflag;
 707         struct klsi_105_port_settings cfg;
 708         unsigned long flags;
 709
 710         /* lock while we are modifying the settings */
 711         spin_lock_irqsave (&priv->lock, flags);
 712
 713         /*
 714          * Update baud rate
 715          */
 716         if( (cflag & CBAUD) != (old_cflag & CBAUD) ) {
 717                 /* reassert DTR and (maybe) RTS on transition from B0 */
 718                 if( (old_cflag & CBAUD) == B0 ) {
 719                         dbg("%s: baud was B0", __FUNCTION__);
 720 #if 0
 721                         priv->control_state |= TIOCM_DTR;
 722                         /* don't set RTS if using hardware flow control */
 723                         if (!(old_cflag & CRTSCTS)) {
 724                                 priv->control_state |= TIOCM_RTS;
 725                         }
 726                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 727 #endif
 728                 }
 729
 730                 switch(cflag & CBAUD) {
 731                 case B0: /* handled below */
 732                         break;
 733                 case B1200: priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 734                         break;
 735                 case B2400: priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 736                         break;
 737                 case B4800: priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 738                         break;
 739                 case B9600: priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 740                         break;
 741                 case B19200: priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 742                         break;
 743                 case B38400: priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 744                         break;
 745                 case B57600: priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 746                         break;
 747                 case B115200: priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 748                         break;
 749                 default:
 750                         err("KLSI USB->Serial converter:"
 751                             " unsupported baudrate request, using default"
 752                             " of 9600");
 753                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 754                         break;
 755                 }
 756                 if ((cflag & CBAUD) == B0 ) {
 757                         dbg("%s: baud is B0", __FUNCTION__);
 758                         /* Drop RTS and DTR */
 759                         /* maybe this should be simulated by sending read
 760                          * disable and read enable messages?
 761                          */
 762                         ;
 763 #if 0
 764                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 765                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 766 #endif
 767                 }
 768         }
 769
 770         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 771                 /* set the number of data bits */
 772                 switch (cflag & CSIZE) {
 773                 case CS5:
 774                         dbg("%s - 5 bits/byte not supported", __FUNCTION__);
 775                         spin_unlock_irqrestore (&priv->lock, flags);
 776                         return ;
 777                 case CS6:
 778                         dbg("%s - 6 bits/byte not supported", __FUNCTION__);
 779                         spin_unlock_irqrestore (&priv->lock, flags);
 780                         return ;
 781                 case CS7:
 782                         priv->cfg.databits = kl5kusb105a_dtb_7;
 783                         break;
 784                 case CS8:
 785                         priv->cfg.databits = kl5kusb105a_dtb_8;
 786                         break;
 787                 default:
 788                         err("CSIZE was not CS5-CS8, using default of 8");
 789                         priv->cfg.databits = kl5kusb105a_dtb_8;
 790                         break;
 791                 }
 792         }
 793
 794         /*
 795          * Update line control register (LCR)
 796          */
 797         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 798             || (cflag & CSTOPB) != (old_cflag & CSTOPB) ) {
 799
 800 #if 0
 801                 priv->last_lcr = 0;
 802
 803                 /* set the parity */
 804                 if (cflag & PARENB)
 805                         priv->last_lcr |= (cflag & PARODD) ?
 806                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 807                 else
 808                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 809
 810                 /* set the number of stop bits */
 811                 priv->last_lcr |= (cflag & CSTOPB) ?
 812                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 813
 814                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 815 #endif
 816                 ;
 817         }
 818
 819         /*
 820          * Set flow control: well, I do not really now how to handle DTR/RTS.
 821          * Just do what we have seen with SniffUSB on Win98.
 822          */
 823         if( (iflag & IXOFF) != (old_iflag & IXOFF)
 824             || (iflag & IXON) != (old_iflag & IXON)
 825             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS) ) {
 826
 827                 /* Drop DTR/RTS if no flow control otherwise assert */
 828 #if 0
 829                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS) )
 830                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 831                 else
 832                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 833                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 834 #endif
 835                 ;
 836         }
 837         memcpy (&cfg, &priv->cfg, sizeof(cfg));
 838         spin_unlock_irqrestore (&priv->lock, flags);
 839
 840         /* now commit changes to device */
 841         klsi_105_chg_port_settings(port, &cfg);
 842 } /* klsi_105_set_termios */
 843
 844
 845 #if 0
 846 static void mct_u232_break_ctl( struct usb_serial_port *port, int break_state )
 847 {
 848         struct usb_serial *serial = port->serial;
 849         struct mct_u232_private *priv = (struct mct_u232_private *)port->private;
 850         unsigned char lcr = priv->last_lcr;
 851
 852         dbg("%sstate=%d", __FUNCTION__, break_state);
 853
 854         if (break_state)
 855                 lcr |= MCT_U232_SET_BREAK;
 856
 857         mct_u232_set_line_ctrl(serial, lcr);
 858 } /* mct_u232_break_ctl */
 859 #endif
 860
 861 static int klsi_105_tiocmget (struct usb_serial_port *port, struct file *file)
 862 {
 863         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 864         unsigned long flags;
 865         int rc;
 866         unsigned long line_state;
 867         dbg("%s - request, just guessing", __FUNCTION__);
 868
 869         rc = klsi_105_get_line_state(port, &line_state);
 870         if (rc < 0) {
 871                 err("Reading line control failed (error = %d)", rc);
 872                 /* better return value? EAGAIN? */
 873                 return rc;
 874         }
 875
 876         spin_lock_irqsave (&priv->lock, flags);
 877         priv->line_state = line_state;
 878         spin_unlock_irqrestore (&priv->lock, flags);
 879         dbg("%s - read line state 0x%lx", __FUNCTION__, line_state);
 880         return (int)line_state;
 881 }
 882
 883 static int klsi_105_tiocmset (struct usb_serial_port *port, struct file *file,
 884                               unsigned int set, unsigned int clear)
 885 {
 886         int retval = -EINVAL;
 887
 888         dbg("%s", __FUNCTION__);
 889
 890 /* if this ever gets implemented, it should be done something like this:
 891         struct usb_serial *serial = port->serial;
 892         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 893         unsigned long flags;
 894         int control;
 895
 896         spin_lock_irqsave (&priv->lock, flags);
 897         if (set & TIOCM_RTS)
 898                 priv->control_state |= TIOCM_RTS;
 899         if (set & TIOCM_DTR)
 900                 priv->control_state |= TIOCM_DTR;
 901         if (clear & TIOCM_RTS)
 902                 priv->control_state &= ~TIOCM_RTS;
 903         if (clear & TIOCM_DTR)
 904                 priv->control_state &= ~TIOCM_DTR;
 905         control = priv->control_state;
 906         spin_unlock_irqrestore (&priv->lock, flags);
 907         retval = mct_u232_set_modem_ctrl(serial, control);
 908 */
 909         return retval;
 910 }
 911
 912 static int klsi_105_ioctl (struct usb_serial_port *port, struct file * file,
 913                            unsigned int cmd, unsigned long arg)
 914 {
 915         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 916         void __user *user_arg = (void __user *)arg;
 917
 918         dbg("%scmd=0x%x", __FUNCTION__, cmd);
 919
 920         /* Based on code from acm.c and others */
 921         switch (cmd) {
 922         case TIOCMIWAIT:
 923                 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
 924                 /* TODO */
 925                 dbg("%s - TIOCMIWAIT not handled", __FUNCTION__);
 926                 return -ENOIOCTLCMD;
 927         case TIOCGICOUNT:
 928                 /* return count of modemline transitions */
 929                 /* TODO */
 930                 dbg("%s - TIOCGICOUNT not handled", __FUNCTION__);
 931                 return -ENOIOCTLCMD;
 932         case TCGETS:
 933                 /* return current info to caller */
 934                 dbg("%s - TCGETS data faked/incomplete", __FUNCTION__);
 935
 936                 if (!access_ok(VERIFY_WRITE, user_arg, sizeof(struct termios)))
 937                         return -EFAULT;
 938
 939                 if (kernel_termios_to_user_termios((struct termios __user *)arg,
 940                                                    &priv->termios))
 941                         return -EFAULT;
 942                 return 0;
 943         case TCSETS:
 944                 /* set port termios to the one given by the user */
 945                 dbg("%s - TCSETS not handled", __FUNCTION__);
 946
 947                 if (!access_ok(VERIFY_READ, user_arg, sizeof(struct termios)))
 948                         return -EFAULT;
 949
 950                 if (user_termios_to_kernel_termios(&priv->termios,
 951                                                    (struct termios __user *)arg))
 952                         return -EFAULT;
 953                 klsi_105_set_termios(port, &priv->termios);
 954                 return 0;
 955         case TCSETSW: {
 956                 /* set port termios and try to wait for completion of last
 957                  * write operation */
 958                 /* We guess here. If there are not too many write urbs
 959                  * outstanding, we lie. */
 960                 /* what is the right way to wait here? schedule() ? */
 961                 /*
 962                 while (klsi_105_chars_in_buffer(port) > (NUM_URBS / 4 ) * URB_TRANSFER_BUFFER_SIZE)
 963                             schedule();
 964                  */
 965                 return -ENOIOCTLCMD;
 966                       }
 967         default:
 968                 dbg("%s: arg not supported - 0x%04x", __FUNCTION__,cmd);
 969                 return(-ENOIOCTLCMD);
 970                 break;
 971         }
 972         return 0;
 973 } /* klsi_105_ioctl */
 974
 975 static void klsi_105_throttle (struct usb_serial_port *port)
 976 {
 977         dbg("%s - port %d", __FUNCTION__, port->number);
 978         usb_kill_urb(port->read_urb);
 979 }
 980
 981 static void klsi_105_unthrottle (struct usb_serial_port *port)
 982 {
 983         int result;
 984
 985         dbg("%s - port %d", __FUNCTION__, port->number);
 986
 987         port->read_urb->dev = port->serial->dev;
 988         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 989         if (result)
 990                 err("%s - failed submitting read urb, error %d", __FUNCTION__,
 991                     result);
 992 }
 993
 994
 995
 996 static int __init klsi_105_init (void)
 997 {
 998         int retval;
 999         retval = usb_serial_register(&kl5kusb105d_device);
1000         if (retval)
1001                 goto failed_usb_serial_register;
1002         retval = usb_register(&kl5kusb105d_driver);
1003         if (retval)
1004                 goto failed_usb_register;
1005
1006         info(DRIVER_DESC " " DRIVER_VERSION);
1007         return 0;
1008 failed_usb_register:
1009         usb_serial_deregister(&kl5kusb105d_device);
1010 failed_usb_serial_register:
1011         return retval;
1012 }
1013
1014
1015 static void __exit klsi_105_exit (void)
1016 {
1017         usb_deregister (&kl5kusb105d_driver);
1018         usb_serial_deregister (&kl5kusb105d_device);
1019 }
1020
1021
1022 module_init (klsi_105_init);
1023 module_exit (klsi_105_exit);
1024
1025 MODULE_AUTHOR( DRIVER_AUTHOR );
1026 MODULE_DESCRIPTION( DRIVER_DESC );
1027 MODULE_LICENSE("GPL");
1028
1029
1030 module_param(debug, bool, S_IRUGO | S_IWUSR);
1031 MODULE_PARM_DESC(debug, "enable extensive debugging messages");
1032
1033 /* vim: set sts=8 ts=8 sw=8: */