drivers/usb/serial/cyberjack.c

   1 /*
   2  *  REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver
   3  *
   4  *  Copyright (C) 2001  REINER SCT
   5  *  Author: Matthias Bruestle
   6  *
   7  *  Contact: support@reiner-sct.com (see MAINTAINERS)
   8  *
   9  *  This program is largely derived from work by the linux-usb group
  10  *  and associated source files.  Please see the usb/serial files for
  11  *  individual credits and copyrights.
  12  *
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  Thanks to Greg Kroah-Hartman (greg@kroah.com) for his help and
  19  *  patience.
  20  *
  21  *  In case of problems, please write to the contact e-mail address
  22  *  mentioned above.
  23  *
  24  *  Please note that later models of the cyberjack reader family are
  25  *  supported by a libusb-based userspace device driver.
  26  *
  27  *  Homepage: http://www.reiner-sct.de/support/treiber_cyberjack.php#linux
  28  */
  29
  30
  31 #include <linux/kernel.h>
  32 #include <linux/errno.h>
  33 #include <linux/init.h>
  34 #include <linux/slab.h>
  35 #include <linux/tty.h>
  36 #include <linux/tty_driver.h>
  37 #include <linux/tty_flip.h>
  38 #include <linux/module.h>
  39 #include <linux/spinlock.h>
  40 #include <asm/uaccess.h>
  41 #include <linux/usb.h>
  42 #include <linux/usb/serial.h>
  43
  44 #define CYBERJACK_LOCAL_BUF_SIZE 32
  45
  46 static int debug;
  47
  48 /*
  49  * Version Information
  50  */
  51 #define DRIVER_VERSION "v1.01"
  52 #define DRIVER_AUTHOR "Matthias Bruestle"
  53 #define DRIVER_DESC "REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver"
  54
  55
  56 #define CYBERJACK_VENDOR_ID     0x0C4B
  57 #define CYBERJACK_PRODUCT_ID    0x0100
  58
  59 /* Function prototypes */
  60 static int cyberjack_startup (struct usb_serial *serial);
  61 static void cyberjack_shutdown (struct usb_serial *serial);
  62 static int  cyberjack_open (struct usb_serial_port *port, struct file *filp);
  63 static void cyberjack_close (struct usb_serial_port *port, struct file *filp);
  64 static int cyberjack_write (struct usb_serial_port *port, const unsigned char *buf, int count);
  65 static int cyberjack_write_room( struct usb_serial_port *port );
  66 static void cyberjack_read_int_callback (struct urb *urb);
  67 static void cyberjack_read_bulk_callback (struct urb *urb);
  68 static void cyberjack_write_bulk_callback (struct urb *urb);
  69
  70 static struct usb_device_id id_table [] = {
  71         { USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
  72         { }                     /* Terminating entry */
  73 };
  74
  75 MODULE_DEVICE_TABLE (usb, id_table);
  76
  77 static struct usb_driver cyberjack_driver = {
  78         .name =         "cyberjack",
  79         .probe =        usb_serial_probe,
  80         .disconnect =   usb_serial_disconnect,
  81         .id_table =     id_table,
  82         .no_dynamic_id =        1,
  83 };
  84
  85 static struct usb_serial_driver cyberjack_device = {
  86         .driver = {
  87                 .owner =        THIS_MODULE,
  88                 .name =         "cyberjack",
  89         },
  90         .description =          "Reiner SCT Cyberjack USB card reader",
  91         .usb_driver =           &cyberjack_driver,
  92         .id_table =             id_table,
  93         .num_interrupt_in =     1,
  94         .num_bulk_in =          1,
  95         .num_bulk_out =         1,
  96         .num_ports =            1,
  97         .attach =               cyberjack_startup,
  98         .shutdown =             cyberjack_shutdown,
  99         .open =                 cyberjack_open,
 100         .close =                cyberjack_close,
 101         .write =                cyberjack_write,
 102         .write_room =           cyberjack_write_room,
 103         .read_int_callback =    cyberjack_read_int_callback,
 104         .read_bulk_callback =   cyberjack_read_bulk_callback,
 105         .write_bulk_callback =  cyberjack_write_bulk_callback,
 106 };
 107
 108 struct cyberjack_private {
 109         spinlock_t      lock;           /* Lock for SMP */
 110         short           rdtodo;         /* Bytes still to read */
 111         unsigned char   wrbuf[5*64];    /* Buffer for collecting data to write */
 112         short           wrfilled;       /* Overall data size we already got */
 113         short           wrsent;         /* Data already sent */
 114 };
 115
 116 /* do some startup allocations not currently performed by usb_serial_probe() */
 117 static int cyberjack_startup (struct usb_serial *serial)
 118 {
 119         struct cyberjack_private *priv;
 120         int i;
 121
 122         dbg("%s", __FUNCTION__);
 123
 124         /* allocate the private data structure */
 125         priv = kmalloc(sizeof(struct cyberjack_private), GFP_KERNEL);
 126         if (!priv)
 127                 return -ENOMEM;
 128
 129         /* set initial values */
 130         spin_lock_init(&priv->lock);
 131         priv->rdtodo = 0;
 132         priv->wrfilled = 0;
 133         priv->wrsent = 0;
 134         usb_set_serial_port_data(serial->port[0], priv);
 135
 136         init_waitqueue_head(&serial->port[0]->write_wait);
 137
 138         for (i = 0; i < serial->num_ports; ++i) {
 139                 int result;
 140                 serial->port[i]->interrupt_in_urb->dev = serial->dev;
 141                 result = usb_submit_urb(serial->port[i]->interrupt_in_urb,
 142                                         GFP_KERNEL);
 143                 if (result)
 144                         err(" usb_submit_urb(read int) failed");
 145                 dbg("%s - usb_submit_urb(int urb)", __FUNCTION__);
 146         }
 147
 148         return( 0 );
 149 }
 150
 151 static void cyberjack_shutdown (struct usb_serial *serial)
 152 {
 153         int i;
 154
 155         dbg("%s", __FUNCTION__);
 156
 157         for (i=0; i < serial->num_ports; ++i) {
 158                 usb_kill_urb(serial->port[i]->interrupt_in_urb);
 159                 /* My special items, the standard routines free my urbs */
 160                 kfree(usb_get_serial_port_data(serial->port[i]));
 161                 usb_set_serial_port_data(serial->port[i], NULL);
 162         }
 163 }
 164
 165 static int  cyberjack_open (struct usb_serial_port *port, struct file *filp)
 166 {
 167         struct cyberjack_private *priv;
 168         unsigned long flags;
 169         int result = 0;
 170
 171         dbg("%s - port %d", __FUNCTION__, port->number);
 172
 173         dbg("%s - usb_clear_halt", __FUNCTION__ );
 174         usb_clear_halt(port->serial->dev, port->write_urb->pipe);
 175
 176         /* force low_latency on so that our tty_push actually forces
 177          * the data through, otherwise it is scheduled, and with high
 178          * data rates (like with OHCI) data can get lost.
 179          */
 180         port->tty->low_latency = 1;
 181
 182         priv = usb_get_serial_port_data(port);
 183         spin_lock_irqsave(&priv->lock, flags);
 184         priv->rdtodo = 0;
 185         priv->wrfilled = 0;
 186         priv->wrsent = 0;
 187         spin_unlock_irqrestore(&priv->lock, flags);
 188
 189         return result;
 190 }
 191
 192 static void cyberjack_close (struct usb_serial_port *port, struct file *filp)
 193 {
 194         dbg("%s - port %d", __FUNCTION__, port->number);
 195
 196         if (port->serial->dev) {
 197                 /* shutdown any bulk reads that might be going on */
 198                 usb_kill_urb(port->write_urb);
 199                 usb_kill_urb(port->read_urb);
 200         }
 201 }
 202
 203 static int cyberjack_write (struct usb_serial_port *port, const unsigned char *buf, int count)
 204 {
 205         struct usb_serial *serial = port->serial;
 206         struct cyberjack_private *priv = usb_get_serial_port_data(port);
 207         unsigned long flags;
 208         int result;
 209         int wrexpected;
 210
 211         dbg("%s - port %d", __FUNCTION__, port->number);
 212
 213         if (count == 0) {
 214                 dbg("%s - write request of 0 bytes", __FUNCTION__);
 215                 return (0);
 216         }
 217
 218         spin_lock_bh(&port->lock);
 219         if (port->write_urb_busy) {
 220                 spin_unlock_bh(&port->lock);
 221                 dbg("%s - already writing", __FUNCTION__);
 222                 return 0;
 223         }
 224         port->write_urb_busy = 1;
 225         spin_unlock_bh(&port->lock);
 226
 227         spin_lock_irqsave(&priv->lock, flags);
 228
 229         if( (count+priv->wrfilled)>sizeof(priv->wrbuf) ) {
 230                 /* To much data for buffer. Reset buffer. */
 231                 priv->wrfilled=0;
 232                 spin_unlock_irqrestore(&priv->lock, flags);
 233                 port->write_urb_busy = 0;
 234                 return (0);
 235         }
 236
 237         /* Copy data */
 238         memcpy (priv->wrbuf+priv->wrfilled, buf, count);
 239
 240         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count,
 241                 priv->wrbuf+priv->wrfilled);
 242         priv->wrfilled += count;
 243
 244         if( priv->wrfilled >= 3 ) {
 245                 wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
 246                 dbg("%s - expected data: %d", __FUNCTION__, wrexpected);
 247         } else {
 248                 wrexpected = sizeof(priv->wrbuf);
 249         }
 250
 251         if( priv->wrfilled >= wrexpected ) {
 252                 /* We have enough data to begin transmission */
 253                 int length;
 254
 255                 dbg("%s - transmitting data (frame 1)", __FUNCTION__);
 256                 length = (wrexpected > port->bulk_out_size) ? port->bulk_out_size : wrexpected;
 257
 258                 memcpy (port->write_urb->transfer_buffer, priv->wrbuf, length );
 259                 priv->wrsent=length;
 260
 261                 /* set up our urb */
 262                 usb_fill_bulk_urb(port->write_urb, serial->dev,
 263                               usb_sndbulkpipe(serial->dev, port->bulk_out_endpointAddress),
 264                               port->write_urb->transfer_buffer, length,
 265                               ((serial->type->write_bulk_callback) ?
 266                                serial->type->write_bulk_callback :
 267                                cyberjack_write_bulk_callback),
 268                               port);
 269
 270                 /* send the data out the bulk port */
 271                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 272                 if (result) {
 273                         err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
 274                         /* Throw away data. No better idea what to do with it. */
 275                         priv->wrfilled=0;
 276                         priv->wrsent=0;
 277                         spin_unlock_irqrestore(&priv->lock, flags);
 278                         port->write_urb_busy = 0;
 279                         return 0;
 280                 }
 281
 282                 dbg("%s - priv->wrsent=%d", __FUNCTION__,priv->wrsent);
 283                 dbg("%s - priv->wrfilled=%d", __FUNCTION__,priv->wrfilled);
 284
 285                 if( priv->wrsent>=priv->wrfilled ) {
 286                         dbg("%s - buffer cleaned", __FUNCTION__);
 287                         memset( priv->wrbuf, 0, sizeof(priv->wrbuf) );
 288                         priv->wrfilled=0;
 289                         priv->wrsent=0;
 290                 }
 291         }
 292
 293         spin_unlock_irqrestore(&priv->lock, flags);
 294
 295         return (count);
 296 }
 297
 298 static int cyberjack_write_room( struct usb_serial_port *port )
 299 {
 300         return CYBERJACK_LOCAL_BUF_SIZE;
 301 }
 302
 303 static void cyberjack_read_int_callback( struct urb *urb )
 304 {
 305         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 306         struct cyberjack_private *priv = usb_get_serial_port_data(port);
 307         unsigned char *data = urb->transfer_buffer;
 308         int status = urb->status;
 309         int result;
 310
 311         dbg("%s - port %d", __FUNCTION__, port->number);
 312
 313         /* the urb might have been killed. */
 314         if (status)
 315                 return;
 316
 317         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 318
 319         /* React only to interrupts signaling a bulk_in transfer */
 320         if( (urb->actual_length==4) && (data[0]==0x01) ) {
 321                 short old_rdtodo;
 322                 int result;
 323
 324                 /* This is a announcement of coming bulk_ins. */
 325                 unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;
 326
 327                 spin_lock(&priv->lock);
 328
 329                 old_rdtodo = priv->rdtodo;
 330
 331                 if( (old_rdtodo+size)<(old_rdtodo) ) {
 332                         dbg( "To many bulk_in urbs to do." );
 333                         spin_unlock(&priv->lock);
 334                         goto resubmit;
 335                 }
 336
 337                 /* "+=" is probably more fault tollerant than "=" */
 338                 priv->rdtodo += size;
 339
 340                 dbg("%s - rdtodo: %d", __FUNCTION__, priv->rdtodo);
 341
 342                 spin_unlock(&priv->lock);
 343
 344                 if( !old_rdtodo ) {
 345                         port->read_urb->dev = port->serial->dev;
 346                         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 347                         if( result )
 348                                 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
 349                         dbg("%s - usb_submit_urb(read urb)", __FUNCTION__);
 350                 }
 351         }
 352
 353 resubmit:
 354         port->interrupt_in_urb->dev = port->serial->dev;
 355         result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
 356         if (result)
 357                 err(" usb_submit_urb(read int) failed");
 358         dbg("%s - usb_submit_urb(int urb)", __FUNCTION__);
 359 }
 360
 361 static void cyberjack_read_bulk_callback (struct urb *urb)
 362 {
 363         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 364         struct cyberjack_private *priv = usb_get_serial_port_data(port);
 365         struct tty_struct *tty;
 366         unsigned char *data = urb->transfer_buffer;
 367         short todo;
 368         int result;
 369         int status = urb->status;
 370
 371         dbg("%s - port %d", __FUNCTION__, port->number);
 372
 373         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 374         if (status) {
 375                 dbg("%s - nonzero read bulk status received: %d",
 376                     __FUNCTION__, status);
 377                 return;
 378         }
 379
 380         tty = port->tty;
 381         if (!tty) {
 382                 dbg("%s - ignoring since device not open\n", __FUNCTION__);
 383                 return;
 384         }
 385         if (urb->actual_length) {
 386                 tty_buffer_request_room(tty, urb->actual_length);
 387                 tty_insert_flip_string(tty, data, urb->actual_length);
 388                 tty_flip_buffer_push(tty);
 389         }
 390
 391         spin_lock(&priv->lock);
 392
 393         /* Reduce urbs to do by one. */
 394         priv->rdtodo-=urb->actual_length;
 395         /* Just to be sure */
 396         if ( priv->rdtodo<0 ) priv->rdtodo = 0;
 397         todo = priv->rdtodo;
 398
 399         spin_unlock(&priv->lock);
 400
 401         dbg("%s - rdtodo: %d", __FUNCTION__, todo);
 402
 403         /* Continue to read if we have still urbs to do. */
 404         if( todo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/ ) {
 405                 port->read_urb->dev = port->serial->dev;
 406                 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 407                 if (result)
 408                         err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
 409                 dbg("%s - usb_submit_urb(read urb)", __FUNCTION__);
 410         }
 411 }
 412
 413 static void cyberjack_write_bulk_callback (struct urb *urb)
 414 {
 415         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 416         struct cyberjack_private *priv = usb_get_serial_port_data(port);
 417         int status = urb->status;
 418
 419         dbg("%s - port %d", __FUNCTION__, port->number);
 420
 421         port->write_urb_busy = 0;
 422         if (status) {
 423                 dbg("%s - nonzero write bulk status received: %d",
 424                     __FUNCTION__, status);
 425                 return;
 426         }
 427
 428         spin_lock(&priv->lock);
 429
 430         /* only do something if we have more data to send */
 431         if( priv->wrfilled ) {
 432                 int length, blksize, result;
 433
 434                 dbg("%s - transmitting data (frame n)", __FUNCTION__);
 435
 436                 length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
 437                         port->bulk_out_size : (priv->wrfilled - priv->wrsent);
 438
 439                 memcpy (port->write_urb->transfer_buffer, priv->wrbuf + priv->wrsent,
 440                         length );
 441                 priv->wrsent+=length;
 442
 443                 /* set up our urb */
 444                 usb_fill_bulk_urb(port->write_urb, port->serial->dev,
 445                               usb_sndbulkpipe(port->serial->dev, port->bulk_out_endpointAddress),
 446                               port->write_urb->transfer_buffer, length,
 447                               ((port->serial->type->write_bulk_callback) ?
 448                                port->serial->type->write_bulk_callback :
 449                                cyberjack_write_bulk_callback),
 450                               port);
 451
 452                 /* send the data out the bulk port */
 453                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 454                 if (result) {
 455                         err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
 456                         /* Throw away data. No better idea what to do with it. */
 457                         priv->wrfilled=0;
 458                         priv->wrsent=0;
 459                         goto exit;
 460                 }
 461
 462                 dbg("%s - priv->wrsent=%d", __FUNCTION__,priv->wrsent);
 463                 dbg("%s - priv->wrfilled=%d", __FUNCTION__,priv->wrfilled);
 464
 465                 blksize = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
 466
 467                 if( (priv->wrsent>=priv->wrfilled) || (priv->wrsent>=blksize) ) {
 468                         dbg("%s - buffer cleaned", __FUNCTION__);
 469                         memset( priv->wrbuf, 0, sizeof(priv->wrbuf) );
 470                         priv->wrfilled=0;
 471                         priv->wrsent=0;
 472                 }
 473         }
 474
 475 exit:
 476         spin_unlock(&priv->lock);
 477         usb_serial_port_softint(port);
 478 }
 479
 480 static int __init cyberjack_init (void)
 481 {
 482         int retval;
 483         retval  = usb_serial_register(&cyberjack_device);
 484         if (retval)
 485                 goto failed_usb_serial_register;
 486         retval = usb_register(&cyberjack_driver);
 487         if (retval)
 488                 goto failed_usb_register;
 489
 490         info(DRIVER_VERSION " " DRIVER_AUTHOR);
 491         info(DRIVER_DESC);
 492
 493         return 0;
 494 failed_usb_register:
 495         usb_serial_deregister(&cyberjack_device);
 496 failed_usb_serial_register:
 497         return retval;
 498 }
 499
 500 static void __exit cyberjack_exit (void)
 501 {
 502         usb_deregister (&cyberjack_driver);
 503         usb_serial_deregister (&cyberjack_device);
 504 }
 505
 506 module_init(cyberjack_init);
 507 module_exit(cyberjack_exit);
 508
 509 MODULE_AUTHOR( DRIVER_AUTHOR );
 510 MODULE_DESCRIPTION( DRIVER_DESC );
 511 MODULE_VERSION( DRIVER_VERSION );
 512 MODULE_LICENSE("GPL");
 513
 514 module_param(debug, bool, S_IRUGO | S_IWUSR);
 515 MODULE_PARM_DESC(debug, "Debug enabled or not");