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