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_driver kl5kusb105d_device = {
 127         .driver = {
 128                 .owner =        THIS_MODULE,
 129         },
 130         .name =              "KL5KUSB105D / PalmConnect",
 131         .short_name =        "kl5kusb105d",
 132         .id_table =          id_table,
 133         .num_interrupt_in =  1,
 134         .num_bulk_in =       1,
 135         .num_bulk_out =      1,
 136         .num_ports =         1,
 137         .open =              klsi_105_open,
 138         .close =             klsi_105_close,
 139         .write =             klsi_105_write,
 140         .write_bulk_callback = klsi_105_write_bulk_callback,
 141         .chars_in_buffer =   klsi_105_chars_in_buffer,
 142         .write_room =        klsi_105_write_room,
 143         .read_bulk_callback =klsi_105_read_bulk_callback,
 144         .ioctl =             klsi_105_ioctl,
 145         .set_termios =       klsi_105_set_termios,
 146         /*.break_ctl =       klsi_105_break_ctl,*/
 147         .tiocmget =          klsi_105_tiocmget,
 148         .tiocmset =          klsi_105_tiocmset,
 149         .attach =            klsi_105_startup,
 150         .shutdown =          klsi_105_shutdown,
 151         .throttle =          klsi_105_throttle,
 152         .unthrottle =        klsi_105_unthrottle,
 153 };
 154
 155 struct klsi_105_port_settings {
 156         __u8    pktlen;         /* always 5, it seems */
 157         __u8    baudrate;
 158         __u8    databits;
 159         __u8    unknown1;
 160         __u8    unknown2;
 161 } __attribute__ ((packed));
 162
 163 /* we implement a pool of NUM_URBS urbs per usb_serial */
 164 #define NUM_URBS                        1
 165 #define URB_TRANSFER_BUFFER_SIZE        64
 166 struct klsi_105_private {
 167         struct klsi_105_port_settings   cfg;
 168         struct termios                  termios;
 169         unsigned long                   line_state; /* modem line settings */
 170         /* write pool */
 171         struct urb *                    write_urb_pool[NUM_URBS];
 172         spinlock_t                      lock;
 173         unsigned long                   bytes_in;
 174         unsigned long                   bytes_out;
 175 };
 176
 177
 178 /*
 179  * Handle vendor specific USB requests
 180  */
 181
 182
 183 #define KLSI_TIMEOUT     5000 /* default urb timeout */
 184
 185 static int klsi_105_chg_port_settings(struct usb_serial_port *port,
 186                                       struct klsi_105_port_settings *settings)
 187 {
 188         int rc;
 189
 190         rc = usb_control_msg(port->serial->dev,
 191                              usb_sndctrlpipe(port->serial->dev, 0),
 192                              KL5KUSB105A_SIO_SET_DATA,
 193                              USB_TYPE_VENDOR | USB_DIR_OUT | USB_RECIP_INTERFACE,
 194                              0, /* value */
 195                              0, /* index */
 196                              settings,
 197                              sizeof(struct klsi_105_port_settings),
 198                              KLSI_TIMEOUT);
 199         if (rc < 0)
 200                 err("Change port settings failed (error = %d)", rc);
 201         info("%s - %d byte block, baudrate %x, databits %d, u1 %d, u2 %d",
 202             __FUNCTION__,
 203             settings->pktlen,
 204             settings->baudrate, settings->databits,
 205             settings->unknown1, settings->unknown2);
 206         return rc;
 207 } /* klsi_105_chg_port_settings */
 208
 209 /* translate a 16-bit status value from the device to linux's TIO bits */
 210 static unsigned long klsi_105_status2linestate(const __u16 status)
 211 {
 212         unsigned long res = 0;
 213
 214         res =   ((status & KL5KUSB105A_DSR) ? TIOCM_DSR : 0)
 215               | ((status & KL5KUSB105A_CTS) ? TIOCM_CTS : 0)
 216               ;
 217
 218         return res;
 219 }
 220 /*
 221  * Read line control via vendor command and return result through
 222  * *line_state_p
 223  */
 224 /* It seems that the status buffer has always only 2 bytes length */
 225 #define KLSI_STATUSBUF_LEN      2
 226 static int klsi_105_get_line_state(struct usb_serial_port *port,
 227                                    unsigned long *line_state_p)
 228 {
 229         int rc;
 230         __u8 status_buf[KLSI_STATUSBUF_LEN] = { -1,-1};
 231         __u16 status;
 232
 233         info("%s - sending SIO Poll request", __FUNCTION__);
 234         rc = usb_control_msg(port->serial->dev,
 235                              usb_rcvctrlpipe(port->serial->dev, 0),
 236                              KL5KUSB105A_SIO_POLL,
 237                              USB_TYPE_VENDOR | USB_DIR_IN,
 238                              0, /* value */
 239                              0, /* index */
 240                              status_buf, KLSI_STATUSBUF_LEN,
 241                              10000
 242                              );
 243         if (rc < 0)
 244                 err("Reading line status failed (error = %d)", rc);
 245         else {
 246                 status = status_buf[0] + (status_buf[1]<<8);
 247
 248                 info("%s - read status %x %x", __FUNCTION__,
 249                      status_buf[0], status_buf[1]);
 250
 251                 *line_state_p = klsi_105_status2linestate(status);
 252         }
 253
 254         return rc;
 255 }
 256
 257
 258 /*
 259  * Driver's tty interface functions
 260  */
 261
 262 static int klsi_105_startup (struct usb_serial *serial)
 263 {
 264         struct klsi_105_private *priv;
 265         int i;
 266
 267         /* check if we support the product id (see keyspan.c)
 268          * FIXME
 269          */
 270
 271         /* allocate the private data structure */
 272         for (i=0; i<serial->num_ports; i++) {
 273                 int j;
 274                 priv = kmalloc(sizeof(struct klsi_105_private),
 275                                                    GFP_KERNEL);
 276                 if (!priv) {
 277                         dbg("%skmalloc for klsi_105_private failed.", __FUNCTION__);
 278                         return -ENOMEM;
 279                 }
 280                 /* set initial values for control structures */
 281                 priv->cfg.pktlen    = 5;
 282                 priv->cfg.baudrate  = kl5kusb105a_sio_b9600;
 283                 priv->cfg.databits  = kl5kusb105a_dtb_8;
 284                 priv->cfg.unknown1  = 0;
 285                 priv->cfg.unknown2  = 1;
 286
 287                 priv->line_state    = 0;
 288
 289                 priv->bytes_in      = 0;
 290                 priv->bytes_out     = 0;
 291                 usb_set_serial_port_data(serial->port[i], priv);
 292
 293                 spin_lock_init (&priv->lock);
 294                 for (j=0; j<NUM_URBS; j++) {
 295                         struct urb* urb = usb_alloc_urb(0, GFP_KERNEL);
 296
 297                         priv->write_urb_pool[j] = urb;
 298                         if (urb == NULL) {
 299                                 err("No more urbs???");
 300                                 continue;
 301                         }
 302
 303                         urb->transfer_buffer = NULL;
 304                         urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE,
 305                                                         GFP_KERNEL);
 306                         if (!urb->transfer_buffer) {
 307                                 err("%s - out of memory for urb buffers.", __FUNCTION__);
 308                                 continue;
 309                         }
 310                 }
 311
 312                 /* priv->termios is left uninitalized until port opening */
 313                 init_waitqueue_head(&serial->port[i]->write_wait);
 314         }
 315
 316         return (0);
 317 } /* klsi_105_startup */
 318
 319
 320 static void klsi_105_shutdown (struct usb_serial *serial)
 321 {
 322         int i;
 323
 324         dbg("%s", __FUNCTION__);
 325
 326         /* stop reads and writes on all ports */
 327         for (i=0; i < serial->num_ports; ++i) {
 328                 struct klsi_105_private *priv = usb_get_serial_port_data(serial->port[i]);
 329                 unsigned long flags;
 330
 331                 if (priv) {
 332                         /* kill our write urb pool */
 333                         int j;
 334                         struct urb **write_urbs = priv->write_urb_pool;
 335                         spin_lock_irqsave(&priv->lock,flags);
 336
 337                         for (j = 0; j < NUM_URBS; j++) {
 338                                 if (write_urbs[j]) {
 339                                         /* FIXME - uncomment the following
 340                                          * usb_kill_urb call when the host
 341                                          * controllers get fixed to set
 342                                          * urb->dev = NULL after the urb is
 343                                          * finished.  Otherwise this call
 344                                          * oopses. */
 345                                         /* usb_kill_urb(write_urbs[j]); */
 346                                         kfree(write_urbs[j]->transfer_buffer);
 347                                         usb_free_urb (write_urbs[j]);
 348                                 }
 349                         }
 350
 351                         spin_unlock_irqrestore (&priv->lock, flags);
 352
 353                         kfree(priv);
 354                         usb_set_serial_port_data(serial->port[i], NULL);
 355                 }
 356         }
 357 } /* klsi_105_shutdown */
 358
 359 static int  klsi_105_open (struct usb_serial_port *port, struct file *filp)
 360 {
 361         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 362         int retval = 0;
 363         int rc;
 364         int i;
 365         unsigned long line_state;
 366         struct klsi_105_port_settings cfg;
 367         unsigned long flags;
 368
 369         dbg("%s port %d", __FUNCTION__, port->number);
 370
 371         /* force low_latency on so that our tty_push actually forces
 372          * the data through
 373          * port->tty->low_latency = 1; */
 374
 375         /* Do a defined restart:
 376          * Set up sane default baud rate and send the 'READ_ON'
 377          * vendor command.
 378          * FIXME: set modem line control (how?)
 379          * Then read the modem line control and store values in
 380          * priv->line_state.
 381          */
 382         cfg.pktlen   = 5;
 383         cfg.baudrate = kl5kusb105a_sio_b9600;
 384         cfg.databits = kl5kusb105a_dtb_8;
 385         cfg.unknown1 = 0;
 386         cfg.unknown2 = 1;
 387         klsi_105_chg_port_settings(port, &cfg);
 388
 389         /* set up termios structure */
 390         spin_lock_irqsave (&priv->lock, flags);
 391         priv->termios.c_iflag = port->tty->termios->c_iflag;
 392         priv->termios.c_oflag = port->tty->termios->c_oflag;
 393         priv->termios.c_cflag = port->tty->termios->c_cflag;
 394         priv->termios.c_lflag = port->tty->termios->c_lflag;
 395         for (i=0; i<NCCS; i++)
 396                 priv->termios.c_cc[i] = port->tty->termios->c_cc[i];
 397         priv->cfg.pktlen   = cfg.pktlen;
 398         priv->cfg.baudrate = cfg.baudrate;
 399         priv->cfg.databits = cfg.databits;
 400         priv->cfg.unknown1 = cfg.unknown1;
 401         priv->cfg.unknown2 = cfg.unknown2;
 402         spin_unlock_irqrestore (&priv->lock, flags);
 403
 404         /* READ_ON and urb submission */
 405         usb_fill_bulk_urb(port->read_urb, port->serial->dev,
 406                       usb_rcvbulkpipe(port->serial->dev,
 407                                       port->bulk_in_endpointAddress),
 408                       port->read_urb->transfer_buffer,
 409                       port->read_urb->transfer_buffer_length,
 410                       klsi_105_read_bulk_callback,
 411                       port);
 412
 413         rc = usb_submit_urb(port->read_urb, GFP_KERNEL);
 414         if (rc) {
 415                 err("%s - failed submitting read urb, error %d", __FUNCTION__, rc);
 416                 retval = rc;
 417                 goto exit;
 418         }
 419
 420         rc = usb_control_msg(port->serial->dev,
 421                              usb_sndctrlpipe(port->serial->dev,0),
 422                              KL5KUSB105A_SIO_CONFIGURE,
 423                              USB_TYPE_VENDOR|USB_DIR_OUT|USB_RECIP_INTERFACE,
 424                              KL5KUSB105A_SIO_CONFIGURE_READ_ON,
 425                              0, /* index */
 426                              NULL,
 427                              0,
 428                              KLSI_TIMEOUT);
 429         if (rc < 0) {
 430                 err("Enabling read failed (error = %d)", rc);
 431                 retval = rc;
 432         } else
 433                 dbg("%s - enabled reading", __FUNCTION__);
 434
 435         rc = klsi_105_get_line_state(port, &line_state);
 436         if (rc >= 0) {
 437                 spin_lock_irqsave (&priv->lock, flags);
 438                 priv->line_state = line_state;
 439                 spin_unlock_irqrestore (&priv->lock, flags);
 440                 dbg("%s - read line state 0x%lx", __FUNCTION__, line_state);
 441                 retval = 0;
 442         } else
 443                 retval = rc;
 444
 445 exit:
 446         return retval;
 447 } /* klsi_105_open */
 448
 449
 450 static void klsi_105_close (struct usb_serial_port *port, struct file *filp)
 451 {
 452         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 453         int rc;
 454
 455         dbg("%s port %d", __FUNCTION__, port->number);
 456
 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         /* shutdown our bulk reads and writes */
 470         usb_kill_urb(port->write_urb);
 471         usb_kill_urb(port->read_urb);
 472         /* unlink our write pool */
 473         /* FIXME */
 474         /* wgg - do I need this? I think so. */
 475         usb_kill_urb(port->interrupt_in_urb);
 476         info("kl5kusb105 port stats: %ld bytes in, %ld bytes out", priv->bytes_in, priv->bytes_out);
 477 } /* klsi_105_close */
 478
 479
 480 /* We need to write a complete 64-byte data block and encode the
 481  * number actually sent in the first double-byte, LSB-order. That
 482  * leaves at most 62 bytes of payload.
 483  */
 484 #define KLSI_105_DATA_OFFSET    2   /* in the bulk urb data block */
 485
 486
 487 static int klsi_105_write (struct usb_serial_port *port,
 488                            const unsigned char *buf, int count)
 489 {
 490         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 491         int result, size;
 492         int bytes_sent=0;
 493
 494         dbg("%s - port %d", __FUNCTION__, port->number);
 495
 496         while (count > 0) {
 497                 /* try to find a free urb (write 0 bytes if none) */
 498                 struct urb *urb = NULL;
 499                 unsigned long flags;
 500                 int i;
 501                 /* since the pool is per-port we might not need the spin lock !? */
 502                 spin_lock_irqsave (&priv->lock, flags);
 503                 for (i=0; i<NUM_URBS; i++) {
 504                         if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
 505                                 urb = priv->write_urb_pool[i];
 506                                 dbg("%s - using pool URB %d", __FUNCTION__, i);
 507                                 break;
 508                         }
 509                 }
 510                 spin_unlock_irqrestore (&priv->lock, flags);
 511
 512                 if (urb==NULL) {
 513                         dbg("%s - no more free urbs", __FUNCTION__);
 514                         goto exit;
 515                 }
 516
 517                 if (urb->transfer_buffer == NULL) {
 518                         urb->transfer_buffer = kmalloc (URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
 519                         if (urb->transfer_buffer == NULL) {
 520                                 err("%s - no more kernel memory...", __FUNCTION__);
 521                                 goto exit;
 522                         }
 523                 }
 524
 525                 size = min (count, port->bulk_out_size - KLSI_105_DATA_OFFSET);
 526                 size = min (size, URB_TRANSFER_BUFFER_SIZE - KLSI_105_DATA_OFFSET);
 527
 528                 memcpy (urb->transfer_buffer + KLSI_105_DATA_OFFSET, buf, size);
 529
 530                 /* write payload size into transfer buffer */
 531                 ((__u8 *)urb->transfer_buffer)[0] = (__u8) (size & 0xFF);
 532                 ((__u8 *)urb->transfer_buffer)[1] = (__u8) ((size & 0xFF00)>>8);
 533
 534                 /* set up our urb */
 535                 usb_fill_bulk_urb(urb, port->serial->dev,
 536                               usb_sndbulkpipe(port->serial->dev,
 537                                               port->bulk_out_endpointAddress),
 538                               urb->transfer_buffer,
 539                               URB_TRANSFER_BUFFER_SIZE,
 540                               klsi_105_write_bulk_callback,
 541                               port);
 542
 543                 /* send the data out the bulk port */
 544                 result = usb_submit_urb(urb, GFP_ATOMIC);
 545                 if (result) {
 546                         err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
 547                         goto exit;
 548                 }
 549                 buf += size;
 550                 bytes_sent += size;
 551                 count -= size;
 552         }
 553 exit:
 554         /* lockless, but it's for debug info only... */
 555         priv->bytes_out+=bytes_sent;
 556
 557         return bytes_sent;      /* that's how much we wrote */
 558 } /* klsi_105_write */
 559
 560 static void klsi_105_write_bulk_callback ( struct urb *urb, struct pt_regs *regs)
 561 {
 562         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 563
 564         dbg("%s - port %d", __FUNCTION__, port->number);
 565
 566         if (urb->status) {
 567                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__,
 568                     urb->status);
 569                 return;
 570         }
 571
 572         /* from generic_write_bulk_callback */
 573         schedule_work(&port->work);
 574 } /* klsi_105_write_bulk_completion_callback */
 575
 576
 577 /* return number of characters currently in the writing process */
 578 static int klsi_105_chars_in_buffer (struct usb_serial_port *port)
 579 {
 580         int chars = 0;
 581         int i;
 582         unsigned long flags;
 583         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 584
 585         spin_lock_irqsave (&priv->lock, flags);
 586
 587         for (i = 0; i < NUM_URBS; ++i) {
 588                 if (priv->write_urb_pool[i]->status == -EINPROGRESS) {
 589                         chars += URB_TRANSFER_BUFFER_SIZE;
 590                 }
 591         }
 592
 593         spin_unlock_irqrestore (&priv->lock, flags);
 594
 595         dbg("%s - returns %d", __FUNCTION__, chars);
 596         return (chars);
 597 }
 598
 599 static int klsi_105_write_room (struct usb_serial_port *port)
 600 {
 601         unsigned long flags;
 602         int i;
 603         int room = 0;
 604         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 605
 606         spin_lock_irqsave (&priv->lock, flags);
 607         for (i = 0; i < NUM_URBS; ++i) {
 608                 if (priv->write_urb_pool[i]->status != -EINPROGRESS) {
 609                         room += URB_TRANSFER_BUFFER_SIZE;
 610                 }
 611         }
 612
 613         spin_unlock_irqrestore (&priv->lock, flags);
 614
 615         dbg("%s - returns %d", __FUNCTION__, room);
 616         return (room);
 617 }
 618
 619
 620
 621 static void klsi_105_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 622 {
 623         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 624         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 625         struct tty_struct *tty;
 626         unsigned char *data = urb->transfer_buffer;
 627         int rc;
 628
 629         dbg("%s - port %d", __FUNCTION__, port->number);
 630
 631         /* The urb might have been killed. */
 632         if (urb->status) {
 633                 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__,
 634                     urb->status);
 635                 return;
 636         }
 637
 638         /* The data received is again preceded by a length double-byte in LSB-
 639          * first order (see klsi_105_write() )
 640          */
 641         if (urb->actual_length == 0) {
 642                 /* empty urbs seem to happen, we ignore them */
 643                 /* dbg("%s - emtpy URB", __FUNCTION__); */
 644                ;
 645         } else if (urb->actual_length <= 2) {
 646                 dbg("%s - size %d URB not understood", __FUNCTION__,
 647                     urb->actual_length);
 648                 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
 649                                       urb->actual_length, data);
 650         } else {
 651                 int i;
 652                 int bytes_sent = ((__u8 *) data)[0] +
 653                                  ((unsigned int) ((__u8 *) data)[1] << 8);
 654                 tty = port->tty;
 655                 /* we should immediately resubmit the URB, before attempting
 656                  * to pass the data on to the tty layer. But that needs locking
 657                  * against re-entry an then mixed-up data because of
 658                  * intermixed tty_flip_buffer_push()s
 659                  * FIXME
 660                  */
 661                 usb_serial_debug_data(debug, &port->dev, __FUNCTION__,
 662                                       urb->actual_length, data);
 663
 664                 if (bytes_sent + 2 > urb->actual_length) {
 665                         dbg("%s - trying to read more data than available"
 666                             " (%d vs. %d)", __FUNCTION__,
 667                             bytes_sent+2, urb->actual_length);
 668                         /* cap at implied limit */
 669                         bytes_sent = urb->actual_length - 2;
 670                 }
 671
 672                 for (i = 2; i < 2+bytes_sent; i++) {
 673                         /* if we insert more than TTY_FLIPBUF_SIZE characters,
 674                          * we drop them. */
 675                         if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
 676                                 tty_flip_buffer_push(tty);
 677                         }
 678                         /* this doesn't actually push the data through unless
 679                          * tty->low_latency is set */
 680                         tty_insert_flip_char(tty, ((__u8*) data)[i], 0);
 681                 }
 682                 tty_flip_buffer_push(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", __FUNCTION__, rc);
 698 } /* klsi_105_read_bulk_callback */
 699
 700
 701 static void klsi_105_set_termios (struct usb_serial_port *port,
 702                                   struct termios *old_termios)
 703 {
 704         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 705         unsigned int iflag = port->tty->termios->c_iflag;
 706         unsigned int old_iflag = old_termios->c_iflag;
 707         unsigned int cflag = port->tty->termios->c_cflag;
 708         unsigned int old_cflag = old_termios->c_cflag;
 709         struct klsi_105_port_settings cfg;
 710         unsigned long flags;
 711
 712         /* lock while we are modifying the settings */
 713         spin_lock_irqsave (&priv->lock, flags);
 714
 715         /*
 716          * Update baud rate
 717          */
 718         if( (cflag & CBAUD) != (old_cflag & CBAUD) ) {
 719                 /* reassert DTR and (maybe) RTS on transition from B0 */
 720                 if( (old_cflag & CBAUD) == B0 ) {
 721                         dbg("%s: baud was B0", __FUNCTION__);
 722 #if 0
 723                         priv->control_state |= TIOCM_DTR;
 724                         /* don't set RTS if using hardware flow control */
 725                         if (!(old_cflag & CRTSCTS)) {
 726                                 priv->control_state |= TIOCM_RTS;
 727                         }
 728                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 729 #endif
 730                 }
 731
 732                 switch(cflag & CBAUD) {
 733                 case B0: /* handled below */
 734                         break;
 735                 case B1200: priv->cfg.baudrate = kl5kusb105a_sio_b1200;
 736                         break;
 737                 case B2400: priv->cfg.baudrate = kl5kusb105a_sio_b2400;
 738                         break;
 739                 case B4800: priv->cfg.baudrate = kl5kusb105a_sio_b4800;
 740                         break;
 741                 case B9600: priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 742                         break;
 743                 case B19200: priv->cfg.baudrate = kl5kusb105a_sio_b19200;
 744                         break;
 745                 case B38400: priv->cfg.baudrate = kl5kusb105a_sio_b38400;
 746                         break;
 747                 case B57600: priv->cfg.baudrate = kl5kusb105a_sio_b57600;
 748                         break;
 749                 case B115200: priv->cfg.baudrate = kl5kusb105a_sio_b115200;
 750                         break;
 751                 default:
 752                         err("KLSI USB->Serial converter:"
 753                             " unsupported baudrate request, using default"
 754                             " of 9600");
 755                         priv->cfg.baudrate = kl5kusb105a_sio_b9600;
 756                         break;
 757                 }
 758                 if ((cflag & CBAUD) == B0 ) {
 759                         dbg("%s: baud is B0", __FUNCTION__);
 760                         /* Drop RTS and DTR */
 761                         /* maybe this should be simulated by sending read
 762                          * disable and read enable messages?
 763                          */
 764                         ;
 765 #if 0
 766                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 767                         mct_u232_set_modem_ctrl(serial, priv->control_state);
 768 #endif
 769                 }
 770         }
 771
 772         if ((cflag & CSIZE) != (old_cflag & CSIZE)) {
 773                 /* set the number of data bits */
 774                 switch (cflag & CSIZE) {
 775                 case CS5:
 776                         dbg("%s - 5 bits/byte not supported", __FUNCTION__);
 777                         spin_unlock_irqrestore (&priv->lock, flags);
 778                         return ;
 779                 case CS6:
 780                         dbg("%s - 6 bits/byte not supported", __FUNCTION__);
 781                         spin_unlock_irqrestore (&priv->lock, flags);
 782                         return ;
 783                 case CS7:
 784                         priv->cfg.databits = kl5kusb105a_dtb_7;
 785                         break;
 786                 case CS8:
 787                         priv->cfg.databits = kl5kusb105a_dtb_8;
 788                         break;
 789                 default:
 790                         err("CSIZE was not CS5-CS8, using default of 8");
 791                         priv->cfg.databits = kl5kusb105a_dtb_8;
 792                         break;
 793                 }
 794         }
 795
 796         /*
 797          * Update line control register (LCR)
 798          */
 799         if ((cflag & (PARENB|PARODD)) != (old_cflag & (PARENB|PARODD))
 800             || (cflag & CSTOPB) != (old_cflag & CSTOPB) ) {
 801
 802 #if 0
 803                 priv->last_lcr = 0;
 804
 805                 /* set the parity */
 806                 if (cflag & PARENB)
 807                         priv->last_lcr |= (cflag & PARODD) ?
 808                                 MCT_U232_PARITY_ODD : MCT_U232_PARITY_EVEN;
 809                 else
 810                         priv->last_lcr |= MCT_U232_PARITY_NONE;
 811
 812                 /* set the number of stop bits */
 813                 priv->last_lcr |= (cflag & CSTOPB) ?
 814                         MCT_U232_STOP_BITS_2 : MCT_U232_STOP_BITS_1;
 815
 816                 mct_u232_set_line_ctrl(serial, priv->last_lcr);
 817 #endif
 818                 ;
 819         }
 820
 821         /*
 822          * Set flow control: well, I do not really now how to handle DTR/RTS.
 823          * Just do what we have seen with SniffUSB on Win98.
 824          */
 825         if( (iflag & IXOFF) != (old_iflag & IXOFF)
 826             || (iflag & IXON) != (old_iflag & IXON)
 827             ||  (cflag & CRTSCTS) != (old_cflag & CRTSCTS) ) {
 828
 829                 /* Drop DTR/RTS if no flow control otherwise assert */
 830 #if 0
 831                 if ((iflag & IXOFF) || (iflag & IXON) || (cflag & CRTSCTS) )
 832                         priv->control_state |= TIOCM_DTR | TIOCM_RTS;
 833                 else
 834                         priv->control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 835                 mct_u232_set_modem_ctrl(serial, priv->control_state);
 836 #endif
 837                 ;
 838         }
 839         memcpy (&cfg, &priv->cfg, sizeof(cfg));
 840         spin_unlock_irqrestore (&priv->lock, flags);
 841
 842         /* now commit changes to device */
 843         klsi_105_chg_port_settings(port, &cfg);
 844 } /* klsi_105_set_termios */
 845
 846
 847 #if 0
 848 static void mct_u232_break_ctl( struct usb_serial_port *port, int break_state )
 849 {
 850         struct usb_serial *serial = port->serial;
 851         struct mct_u232_private *priv = (struct mct_u232_private *)port->private;
 852         unsigned char lcr = priv->last_lcr;
 853
 854         dbg("%sstate=%d", __FUNCTION__, break_state);
 855
 856         if (break_state)
 857                 lcr |= MCT_U232_SET_BREAK;
 858
 859         mct_u232_set_line_ctrl(serial, lcr);
 860 } /* mct_u232_break_ctl */
 861 #endif
 862
 863 static int klsi_105_tiocmget (struct usb_serial_port *port, struct file *file)
 864 {
 865         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 866         unsigned long flags;
 867         int rc;
 868         unsigned long line_state;
 869         dbg("%s - request, just guessing", __FUNCTION__);
 870
 871         rc = klsi_105_get_line_state(port, &line_state);
 872         if (rc < 0) {
 873                 err("Reading line control failed (error = %d)", rc);
 874                 /* better return value? EAGAIN? */
 875                 return rc;
 876         }
 877
 878         spin_lock_irqsave (&priv->lock, flags);
 879         priv->line_state = line_state;
 880         spin_unlock_irqrestore (&priv->lock, flags);
 881         dbg("%s - read line state 0x%lx", __FUNCTION__, line_state);
 882         return (int)line_state;
 883 }
 884
 885 static int klsi_105_tiocmset (struct usb_serial_port *port, struct file *file,
 886                               unsigned int set, unsigned int clear)
 887 {
 888         int retval = -EINVAL;
 889
 890         dbg("%s", __FUNCTION__);
 891
 892 /* if this ever gets implemented, it should be done something like this:
 893         struct usb_serial *serial = port->serial;
 894         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 895         unsigned long flags;
 896         int control;
 897
 898         spin_lock_irqsave (&priv->lock, flags);
 899         if (set & TIOCM_RTS)
 900                 priv->control_state |= TIOCM_RTS;
 901         if (set & TIOCM_DTR)
 902                 priv->control_state |= TIOCM_DTR;
 903         if (clear & TIOCM_RTS)
 904                 priv->control_state &= ~TIOCM_RTS;
 905         if (clear & TIOCM_DTR)
 906                 priv->control_state &= ~TIOCM_DTR;
 907         control = priv->control_state;
 908         spin_unlock_irqrestore (&priv->lock, flags);
 909         retval = mct_u232_set_modem_ctrl(serial, control);
 910 */
 911         return retval;
 912 }
 913
 914 static int klsi_105_ioctl (struct usb_serial_port *port, struct file * file,
 915                            unsigned int cmd, unsigned long arg)
 916 {
 917         struct klsi_105_private *priv = usb_get_serial_port_data(port);
 918         void __user *user_arg = (void __user *)arg;
 919
 920         dbg("%scmd=0x%x", __FUNCTION__, cmd);
 921
 922         /* Based on code from acm.c and others */
 923         switch (cmd) {
 924         case TIOCMIWAIT:
 925                 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
 926                 /* TODO */
 927                 dbg("%s - TIOCMIWAIT not handled", __FUNCTION__);
 928                 return -ENOIOCTLCMD;
 929         case TIOCGICOUNT:
 930                 /* return count of modemline transitions */
 931                 /* TODO */
 932                 dbg("%s - TIOCGICOUNT not handled", __FUNCTION__);
 933                 return -ENOIOCTLCMD;
 934         case TCGETS:
 935                 /* return current info to caller */
 936                 dbg("%s - TCGETS data faked/incomplete", __FUNCTION__);
 937
 938                 if (!access_ok(VERIFY_WRITE, user_arg, sizeof(struct termios)))
 939                         return -EFAULT;
 940
 941                 if (kernel_termios_to_user_termios((struct termios __user *)arg,
 942                                                    &priv->termios))
 943                         return -EFAULT;
 944                 return 0;
 945         case TCSETS:
 946                 /* set port termios to the one given by the user */
 947                 dbg("%s - TCSETS not handled", __FUNCTION__);
 948
 949                 if (!access_ok(VERIFY_READ, user_arg, sizeof(struct termios)))
 950                         return -EFAULT;
 951
 952                 if (user_termios_to_kernel_termios(&priv->termios,
 953                                                    (struct termios __user *)arg))
 954                         return -EFAULT;
 955                 klsi_105_set_termios(port, &priv->termios);
 956                 return 0;
 957         case TCSETSW: {
 958                 /* set port termios and try to wait for completion of last
 959                  * write operation */
 960                 /* We guess here. If there are not too many write urbs
 961                  * outstanding, we lie. */
 962                 /* what is the right way to wait here? schedule() ? */
 963                 /*
 964                 while (klsi_105_chars_in_buffer(port) > (NUM_URBS / 4 ) * URB_TRANSFER_BUFFER_SIZE)
 965                             schedule();
 966                  */
 967                 return -ENOIOCTLCMD;
 968                       }
 969         default:
 970                 dbg("%s: arg not supported - 0x%04x", __FUNCTION__,cmd);
 971                 return(-ENOIOCTLCMD);
 972                 break;
 973         }
 974         return 0;
 975 } /* klsi_105_ioctl */
 976
 977 static void klsi_105_throttle (struct usb_serial_port *port)
 978 {
 979         dbg("%s - port %d", __FUNCTION__, port->number);
 980         usb_kill_urb(port->read_urb);
 981 }
 982
 983 static void klsi_105_unthrottle (struct usb_serial_port *port)
 984 {
 985         int result;
 986
 987         dbg("%s - port %d", __FUNCTION__, port->number);
 988
 989         port->read_urb->dev = port->serial->dev;
 990         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 991         if (result)
 992                 err("%s - failed submitting read urb, error %d", __FUNCTION__,
 993                     result);
 994 }
 995
 996
 997
 998 static int __init klsi_105_init (void)
 999 {
1000         int retval;
1001         retval = usb_serial_register(&kl5kusb105d_device);
1002         if (retval)
1003                 goto failed_usb_serial_register;
1004         retval = usb_register(&kl5kusb105d_driver);
1005         if (retval)
1006                 goto failed_usb_register;
1007
1008         info(DRIVER_DESC " " DRIVER_VERSION);
1009         return 0;
1010 failed_usb_register:
1011         usb_serial_deregister(&kl5kusb105d_device);
1012 failed_usb_serial_register:
1013         return retval;
1014 }
1015
1016
1017 static void __exit klsi_105_exit (void)
1018 {
1019         usb_deregister (&kl5kusb105d_driver);
1020         usb_serial_deregister (&kl5kusb105d_device);
1021 }
1022
1023
1024 module_init (klsi_105_init);
1025 module_exit (klsi_105_exit);
1026
1027 MODULE_AUTHOR( DRIVER_AUTHOR );
1028 MODULE_DESCRIPTION( DRIVER_DESC );
1029 MODULE_LICENSE("GPL");
1030
1031
1032 module_param(debug, bool, S_IRUGO | S_IWUSR);
1033 MODULE_PARM_DESC(debug, "enable extensive debugging messages");
1034
1035 /* vim: set sts=8 ts=8 sw=8: */