kernel/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/slab.h>
  34 #include <linux/tty.h>
  35 #include <linux/tty_driver.h>
  36 #include <linux/tty_flip.h>
  37 #include <linux/module.h>
  38 #include <linux/spinlock.h>
  39 #include <linux/uaccess.h>
  40 #include <linux/usb.h>
  41 #include <linux/usb/serial.h>
  42
  43 #define CYBERJACK_LOCAL_BUF_SIZE 32
  44
  45 #define DRIVER_AUTHOR "Matthias Bruestle"
  46 #define DRIVER_DESC "REINER SCT cyberJack pinpad/e-com USB Chipcard Reader Driver"
  47
  48
  49 #define CYBERJACK_VENDOR_ID     0x0C4B
  50 #define CYBERJACK_PRODUCT_ID    0x0100
  51
  52 /* Function prototypes */
  53 static int cyberjack_port_probe(struct usb_serial_port *port);
  54 static int cyberjack_port_remove(struct usb_serial_port *port);
  55 static int  cyberjack_open(struct tty_struct *tty,
  56         struct usb_serial_port *port);
  57 static void cyberjack_close(struct usb_serial_port *port);
  58 static int cyberjack_write(struct tty_struct *tty,
  59         struct usb_serial_port *port, const unsigned char *buf, int count);
  60 static int cyberjack_write_room(struct tty_struct *tty);
  61 static void cyberjack_read_int_callback(struct urb *urb);
  62 static void cyberjack_read_bulk_callback(struct urb *urb);
  63 static void cyberjack_write_bulk_callback(struct urb *urb);
  64
  65 static const struct usb_device_id id_table[] = {
  66         { USB_DEVICE(CYBERJACK_VENDOR_ID, CYBERJACK_PRODUCT_ID) },
  67         { }                     /* Terminating entry */
  68 };
  69
  70 MODULE_DEVICE_TABLE(usb, id_table);
  71
  72 static struct usb_serial_driver cyberjack_device = {
  73         .driver = {
  74                 .owner =        THIS_MODULE,
  75                 .name =         "cyberjack",
  76         },
  77         .description =          "Reiner SCT Cyberjack USB card reader",
  78         .id_table =             id_table,
  79         .num_ports =            1,
  80         .port_probe =           cyberjack_port_probe,
  81         .port_remove =          cyberjack_port_remove,
  82         .open =                 cyberjack_open,
  83         .close =                cyberjack_close,
  84         .write =                cyberjack_write,
  85         .write_room =           cyberjack_write_room,
  86         .read_int_callback =    cyberjack_read_int_callback,
  87         .read_bulk_callback =   cyberjack_read_bulk_callback,
  88         .write_bulk_callback =  cyberjack_write_bulk_callback,
  89 };
  90
  91 static struct usb_serial_driver * const serial_drivers[] = {
  92         &cyberjack_device, NULL
  93 };
  94
  95 struct cyberjack_private {
  96         spinlock_t      lock;           /* Lock for SMP */
  97         short           rdtodo;         /* Bytes still to read */
  98         unsigned char   wrbuf[5*64];    /* Buffer for collecting data to write */
  99         short           wrfilled;       /* Overall data size we already got */
 100         short           wrsent;         /* Data already sent */
 101 };
 102
 103 static int cyberjack_port_probe(struct usb_serial_port *port)
 104 {
 105         struct cyberjack_private *priv;
 106         int result;
 107
 108         priv = kmalloc(sizeof(struct cyberjack_private), GFP_KERNEL);
 109         if (!priv)
 110                 return -ENOMEM;
 111
 112         spin_lock_init(&priv->lock);
 113         priv->rdtodo = 0;
 114         priv->wrfilled = 0;
 115         priv->wrsent = 0;
 116
 117         usb_set_serial_port_data(port, priv);
 118
 119         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 120         if (result)
 121                 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
 122
 123         return 0;
 124 }
 125
 126 static int cyberjack_port_remove(struct usb_serial_port *port)
 127 {
 128         struct cyberjack_private *priv;
 129
 130         usb_kill_urb(port->interrupt_in_urb);
 131
 132         priv = usb_get_serial_port_data(port);
 133         kfree(priv);
 134
 135         return 0;
 136 }
 137
 138 static int  cyberjack_open(struct tty_struct *tty,
 139                                         struct usb_serial_port *port)
 140 {
 141         struct cyberjack_private *priv;
 142         unsigned long flags;
 143         int result = 0;
 144
 145         dev_dbg(&port->dev, "%s - usb_clear_halt\n", __func__);
 146         usb_clear_halt(port->serial->dev, port->write_urb->pipe);
 147
 148         priv = usb_get_serial_port_data(port);
 149         spin_lock_irqsave(&priv->lock, flags);
 150         priv->rdtodo = 0;
 151         priv->wrfilled = 0;
 152         priv->wrsent = 0;
 153         spin_unlock_irqrestore(&priv->lock, flags);
 154
 155         return result;
 156 }
 157
 158 static void cyberjack_close(struct usb_serial_port *port)
 159 {
 160         usb_kill_urb(port->write_urb);
 161         usb_kill_urb(port->read_urb);
 162 }
 163
 164 static int cyberjack_write(struct tty_struct *tty,
 165         struct usb_serial_port *port, const unsigned char *buf, int count)
 166 {
 167         struct device *dev = &port->dev;
 168         struct cyberjack_private *priv = usb_get_serial_port_data(port);
 169         unsigned long flags;
 170         int result;
 171         int wrexpected;
 172
 173         if (count == 0) {
 174                 dev_dbg(dev, "%s - write request of 0 bytes\n", __func__);
 175                 return 0;
 176         }
 177
 178         if (!test_and_clear_bit(0, &port->write_urbs_free)) {
 179                 dev_dbg(dev, "%s - already writing\n", __func__);
 180                 return 0;
 181         }
 182
 183         spin_lock_irqsave(&priv->lock, flags);
 184
 185         if (count+priv->wrfilled > sizeof(priv->wrbuf)) {
 186                 /* To much data for buffer. Reset buffer. */
 187                 priv->wrfilled = 0;
 188                 spin_unlock_irqrestore(&priv->lock, flags);
 189                 set_bit(0, &port->write_urbs_free);
 190                 return 0;
 191         }
 192
 193         /* Copy data */
 194         memcpy(priv->wrbuf + priv->wrfilled, buf, count);
 195
 196         usb_serial_debug_data(dev, __func__, count, priv->wrbuf + priv->wrfilled);
 197         priv->wrfilled += count;
 198
 199         if (priv->wrfilled >= 3) {
 200                 wrexpected = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
 201                 dev_dbg(dev, "%s - expected data: %d\n", __func__, wrexpected);
 202         } else
 203                 wrexpected = sizeof(priv->wrbuf);
 204
 205         if (priv->wrfilled >= wrexpected) {
 206                 /* We have enough data to begin transmission */
 207                 int length;
 208
 209                 dev_dbg(dev, "%s - transmitting data (frame 1)\n", __func__);
 210                 length = (wrexpected > port->bulk_out_size) ?
 211                                         port->bulk_out_size : wrexpected;
 212
 213                 memcpy(port->write_urb->transfer_buffer, priv->wrbuf, length);
 214                 priv->wrsent = length;
 215
 216                 /* set up our urb */
 217                 port->write_urb->transfer_buffer_length = length;
 218
 219                 /* send the data out the bulk port */
 220                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 221                 if (result) {
 222                         dev_err(&port->dev,
 223                                 "%s - failed submitting write urb, error %d\n",
 224                                 __func__, result);
 225                         /* Throw away data. No better idea what to do with it. */
 226                         priv->wrfilled = 0;
 227                         priv->wrsent = 0;
 228                         spin_unlock_irqrestore(&priv->lock, flags);
 229                         set_bit(0, &port->write_urbs_free);
 230                         return 0;
 231                 }
 232
 233                 dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
 234                 dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);
 235
 236                 if (priv->wrsent >= priv->wrfilled) {
 237                         dev_dbg(dev, "%s - buffer cleaned\n", __func__);
 238                         memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
 239                         priv->wrfilled = 0;
 240                         priv->wrsent = 0;
 241                 }
 242         }
 243
 244         spin_unlock_irqrestore(&priv->lock, flags);
 245
 246         return count;
 247 }
 248
 249 static int cyberjack_write_room(struct tty_struct *tty)
 250 {
 251         /* FIXME: .... */
 252         return CYBERJACK_LOCAL_BUF_SIZE;
 253 }
 254
 255 static void cyberjack_read_int_callback(struct urb *urb)
 256 {
 257         struct usb_serial_port *port = urb->context;
 258         struct cyberjack_private *priv = usb_get_serial_port_data(port);
 259         struct device *dev = &port->dev;
 260         unsigned char *data = urb->transfer_buffer;
 261         int status = urb->status;
 262         int result;
 263
 264         /* the urb might have been killed. */
 265         if (status)
 266                 return;
 267
 268         usb_serial_debug_data(dev, __func__, urb->actual_length, data);
 269
 270         /* React only to interrupts signaling a bulk_in transfer */
 271         if (urb->actual_length == 4 && data[0] == 0x01) {
 272                 short old_rdtodo;
 273
 274                 /* This is a announcement of coming bulk_ins. */
 275                 unsigned short size = ((unsigned short)data[3]<<8)+data[2]+3;
 276
 277                 spin_lock(&priv->lock);
 278
 279                 old_rdtodo = priv->rdtodo;
 280
 281                 if (old_rdtodo > SHRT_MAX - size) {
 282                         dev_dbg(dev, "To many bulk_in urbs to do.\n");
 283                         spin_unlock(&priv->lock);
 284                         goto resubmit;
 285                 }
 286
 287                 /* "+=" is probably more fault tolerant than "=" */
 288                 priv->rdtodo += size;
 289
 290                 dev_dbg(dev, "%s - rdtodo: %d\n", __func__, priv->rdtodo);
 291
 292                 spin_unlock(&priv->lock);
 293
 294                 if (!old_rdtodo) {
 295                         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 296                         if (result)
 297                                 dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
 298                                         __func__, result);
 299                         dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
 300                 }
 301         }
 302
 303 resubmit:
 304         result = usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC);
 305         if (result)
 306                 dev_err(&port->dev, "usb_submit_urb(read int) failed\n");
 307         dev_dbg(dev, "%s - usb_submit_urb(int urb)\n", __func__);
 308 }
 309
 310 static void cyberjack_read_bulk_callback(struct urb *urb)
 311 {
 312         struct usb_serial_port *port = urb->context;
 313         struct cyberjack_private *priv = usb_get_serial_port_data(port);
 314         struct device *dev = &port->dev;
 315         unsigned char *data = urb->transfer_buffer;
 316         short todo;
 317         int result;
 318         int status = urb->status;
 319
 320         usb_serial_debug_data(dev, __func__, urb->actual_length, data);
 321         if (status) {
 322                 dev_dbg(dev, "%s - nonzero read bulk status received: %d\n",
 323                         __func__, status);
 324                 return;
 325         }
 326
 327         if (urb->actual_length) {
 328                 tty_insert_flip_string(&port->port, data, urb->actual_length);
 329                 tty_flip_buffer_push(&port->port);
 330         }
 331
 332         spin_lock(&priv->lock);
 333
 334         /* Reduce urbs to do by one. */
 335         priv->rdtodo -= urb->actual_length;
 336         /* Just to be sure */
 337         if (priv->rdtodo < 0)
 338                 priv->rdtodo = 0;
 339         todo = priv->rdtodo;
 340
 341         spin_unlock(&priv->lock);
 342
 343         dev_dbg(dev, "%s - rdtodo: %d\n", __func__, todo);
 344
 345         /* Continue to read if we have still urbs to do. */
 346         if (todo /* || (urb->actual_length==port->bulk_in_endpointAddress)*/) {
 347                 result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 348                 if (result)
 349                         dev_err(dev, "%s - failed resubmitting read urb, error %d\n",
 350                                 __func__, result);
 351                 dev_dbg(dev, "%s - usb_submit_urb(read urb)\n", __func__);
 352         }
 353 }
 354
 355 static void cyberjack_write_bulk_callback(struct urb *urb)
 356 {
 357         struct usb_serial_port *port = urb->context;
 358         struct cyberjack_private *priv = usb_get_serial_port_data(port);
 359         struct device *dev = &port->dev;
 360         int status = urb->status;
 361
 362         set_bit(0, &port->write_urbs_free);
 363         if (status) {
 364                 dev_dbg(dev, "%s - nonzero write bulk status received: %d\n",
 365                         __func__, status);
 366                 return;
 367         }
 368
 369         spin_lock(&priv->lock);
 370
 371         /* only do something if we have more data to send */
 372         if (priv->wrfilled) {
 373                 int length, blksize, result;
 374
 375                 dev_dbg(dev, "%s - transmitting data (frame n)\n", __func__);
 376
 377                 length = ((priv->wrfilled - priv->wrsent) > port->bulk_out_size) ?
 378                         port->bulk_out_size : (priv->wrfilled - priv->wrsent);
 379
 380                 memcpy(port->write_urb->transfer_buffer,
 381                                         priv->wrbuf + priv->wrsent, length);
 382                 priv->wrsent += length;
 383
 384                 /* set up our urb */
 385                 port->write_urb->transfer_buffer_length = length;
 386
 387                 /* send the data out the bulk port */
 388                 result = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 389                 if (result) {
 390                         dev_err(dev, "%s - failed submitting write urb, error %d\n",
 391                                 __func__, result);
 392                         /* Throw away data. No better idea what to do with it. */
 393                         priv->wrfilled = 0;
 394                         priv->wrsent = 0;
 395                         goto exit;
 396                 }
 397
 398                 dev_dbg(dev, "%s - priv->wrsent=%d\n", __func__, priv->wrsent);
 399                 dev_dbg(dev, "%s - priv->wrfilled=%d\n", __func__, priv->wrfilled);
 400
 401                 blksize = ((int)priv->wrbuf[2]<<8)+priv->wrbuf[1]+3;
 402
 403                 if (priv->wrsent >= priv->wrfilled ||
 404                                         priv->wrsent >= blksize) {
 405                         dev_dbg(dev, "%s - buffer cleaned\n", __func__);
 406                         memset(priv->wrbuf, 0, sizeof(priv->wrbuf));
 407                         priv->wrfilled = 0;
 408                         priv->wrsent = 0;
 409                 }
 410         }
 411
 412 exit:
 413         spin_unlock(&priv->lock);
 414         usb_serial_port_softint(port);
 415 }
 416
 417 module_usb_serial_driver(serial_drivers, id_table);
 418
 419 MODULE_AUTHOR(DRIVER_AUTHOR);
 420 MODULE_DESCRIPTION(DRIVER_DESC);
 421 MODULE_LICENSE("GPL");