drivers/media/video/cpia_pp.c

   1 /*
   2  * cpia_pp CPiA Parallel Port driver
   3  *
   4  * Supports CPiA based parallel port Video Camera's.
   5  *
   6  * (C) Copyright 1999 Bas Huisman <bhuism@cs.utwente.nl>
   7  * (C) Copyright 1999-2000 Scott J. Bertin <sbertin@securenym.net>,
   8  * (C) Copyright 1999-2000 Peter Pregler <Peter_Pregler@email.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 /* define _CPIA_DEBUG_ for verbose debug output (see cpia.h) */
  26 /* #define _CPIA_DEBUG_  1 */
  27
  28
  29 #include <linux/module.h>
  30 #include <linux/init.h>
  31
  32 #include <linux/kernel.h>
  33 #include <linux/parport.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/delay.h>
  36 #include <linux/workqueue.h>
  37 #include <linux/sched.h>
  38
  39 #include <linux/kmod.h>
  40
  41 /* #define _CPIA_DEBUG_         define for verbose debug output */
  42 #include "cpia.h"
  43
  44 static int cpia_pp_open(void *privdata);
  45 static int cpia_pp_registerCallback(void *privdata, void (*cb) (void *cbdata),
  46                                     void *cbdata);
  47 static int cpia_pp_transferCmd(void *privdata, u8 *command, u8 *data);
  48 static int cpia_pp_streamStart(void *privdata);
  49 static int cpia_pp_streamStop(void *privdata);
  50 static int cpia_pp_streamRead(void *privdata, u8 *buffer, int noblock);
  51 static int cpia_pp_close(void *privdata);
  52
  53
  54 #define ABOUT "Parallel port driver for Vision CPiA based cameras"
  55
  56 #define PACKET_LENGTH  8
  57
  58 /* Magic numbers for defining port-device mappings */
  59 #define PPCPIA_PARPORT_UNSPEC -4
  60 #define PPCPIA_PARPORT_AUTO -3
  61 #define PPCPIA_PARPORT_OFF -2
  62 #define PPCPIA_PARPORT_NONE -1
  63
  64 static int parport_nr[PARPORT_MAX] = {[0 ... PARPORT_MAX - 1] = PPCPIA_PARPORT_UNSPEC};
  65 static char *parport[PARPORT_MAX] = {NULL,};
  66
  67 MODULE_AUTHOR("B. Huisman <bhuism@cs.utwente.nl> & Peter Pregler <Peter_Pregler@email.com>");
  68 MODULE_DESCRIPTION("Parallel port driver for Vision CPiA based cameras");
  69 MODULE_LICENSE("GPL");
  70
  71 module_param_array(parport, charp, NULL, 0);
  72 MODULE_PARM_DESC(parport, "'auto' or a list of parallel port numbers. Just like lp.");
  73
  74 struct pp_cam_entry {
  75         struct pardevice *pdev;
  76         struct parport *port;
  77         struct work_struct cb_task;
  78         void (*cb_func)(void *cbdata);
  79         void *cb_data;
  80         int open_count;
  81         wait_queue_head_t wq_stream;
  82         /* image state flags */
  83         int image_ready;        /* we got an interrupt */
  84         int image_complete;     /* we have seen 4 EOI */
  85
  86         int streaming; /* we are in streaming mode */
  87         int stream_irq;
  88 };
  89
  90 static struct cpia_camera_ops cpia_pp_ops =
  91 {
  92         cpia_pp_open,
  93         cpia_pp_registerCallback,
  94         cpia_pp_transferCmd,
  95         cpia_pp_streamStart,
  96         cpia_pp_streamStop,
  97         cpia_pp_streamRead,
  98         cpia_pp_close,
  99         1,
 100         THIS_MODULE
 101 };
 102
 103 static LIST_HEAD(cam_list);
 104 static spinlock_t cam_list_lock_pp;
 105
 106 /* FIXME */
 107 static void cpia_parport_enable_irq( struct parport *port ) {
 108         parport_enable_irq(port);
 109         mdelay(10);
 110         return;
 111 }
 112
 113 static void cpia_parport_disable_irq( struct parport *port ) {
 114         parport_disable_irq(port);
 115         mdelay(10);
 116         return;
 117 }
 118
 119 /* Special CPiA PPC modes: These are invoked by using the 1284 Extensibility
 120  * Link Flag during negotiation */
 121 #define UPLOAD_FLAG  0x08
 122 #define NIBBLE_TRANSFER 0x01
 123 #define ECP_TRANSFER 0x03
 124
 125 #define PARPORT_CHUNK_SIZE      PAGE_SIZE
 126
 127
 128 static void cpia_pp_run_callback(struct work_struct *work)
 129 {
 130         void (*cb_func)(void *cbdata);
 131         void *cb_data;
 132         struct pp_cam_entry *cam;
 133
 134         cam = container_of(work, struct pp_cam_entry, cb_task);
 135         cb_func = cam->cb_func;
 136         cb_data = cam->cb_data;
 137
 138         cb_func(cb_data);
 139 }
 140
 141 /****************************************************************************
 142  *
 143  *  CPiA-specific  low-level parport functions for nibble uploads
 144  *
 145  ***************************************************************************/
 146 /*  CPiA nonstandard "Nibble" mode (no nDataAvail signal after each byte). */
 147 /* The standard kernel parport_ieee1284_read_nibble() fails with the CPiA... */
 148
 149 static size_t cpia_read_nibble (struct parport *port,
 150                          void *buffer, size_t len,
 151                          int flags)
 152 {
 153         /* adapted verbatim, with one change, from
 154            parport_ieee1284_read_nibble() in drivers/parport/ieee1284-ops.c */
 155
 156         unsigned char *buf = buffer;
 157         int i;
 158         unsigned char byte = 0;
 159
 160         len *= 2; /* in nibbles */
 161         for (i=0; i < len; i++) {
 162                 unsigned char nibble;
 163
 164                 /* The CPiA firmware suppresses the use of nDataAvail (nFault LO)
 165                  * after every second nibble to signal that more
 166                  * data is available.  (the total number of Bytes that
 167                  * should be sent is known; if too few are received, an error
 168                  * will be recorded after a timeout).
 169                  * This is incompatible with parport_ieee1284_read_nibble(),
 170                  * which expects to find nFault LO after every second nibble.
 171                  */
 172
 173                 /* Solution: modify cpia_read_nibble to only check for
 174                  * nDataAvail before the first nibble is sent.
 175                  */
 176
 177                 /* Does the error line indicate end of data? */
 178                 if (((i /*& 1*/) == 0) &&
 179                     (parport_read_status(port) & PARPORT_STATUS_ERROR)) {
 180                         DBG("%s: No more nibble data (%d bytes)\n",
 181                             port->name, i/2);
 182                         goto end_of_data;
 183                 }
 184
 185                 /* Event 7: Set nAutoFd low. */
 186                 parport_frob_control (port,
 187                                       PARPORT_CONTROL_AUTOFD,
 188                                       PARPORT_CONTROL_AUTOFD);
 189
 190                 /* Event 9: nAck goes low. */
 191                 port->ieee1284.phase = IEEE1284_PH_REV_DATA;
 192                 if (parport_wait_peripheral (port,
 193                                              PARPORT_STATUS_ACK, 0)) {
 194                         /* Timeout -- no more data? */
 195                                  DBG("%s: Nibble timeout at event 9 (%d bytes)\n",
 196                                  port->name, i/2);
 197                         parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
 198                         break;
 199                 }
 200
 201
 202                 /* Read a nibble. */
 203                 nibble = parport_read_status (port) >> 3;
 204                 nibble &= ~8;
 205                 if ((nibble & 0x10) == 0)
 206                         nibble |= 8;
 207                 nibble &= 0xf;
 208
 209                 /* Event 10: Set nAutoFd high. */
 210                 parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
 211
 212                 /* Event 11: nAck goes high. */
 213                 if (parport_wait_peripheral (port,
 214                                              PARPORT_STATUS_ACK,
 215                                              PARPORT_STATUS_ACK)) {
 216                         /* Timeout -- no more data? */
 217                         DBG("%s: Nibble timeout at event 11\n",
 218                                  port->name);
 219                         break;
 220                 }
 221
 222                 if (i & 1) {
 223                         /* Second nibble */
 224                         byte |= nibble << 4;
 225                         *buf++ = byte;
 226                 } else
 227                         byte = nibble;
 228         }
 229
 230         if (i == len) {
 231                 /* Read the last nibble without checking data avail. */
 232                 if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
 233                 end_of_data:
 234                         /* Go to reverse idle phase. */
 235                         parport_frob_control (port,
 236                                               PARPORT_CONTROL_AUTOFD,
 237                                               PARPORT_CONTROL_AUTOFD);
 238                         port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
 239                 }
 240                 else
 241                         port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
 242         }
 243
 244         return i/2;
 245 }
 246
 247 /* CPiA nonstandard "Nibble Stream" mode (2 nibbles per cycle, instead of 1)
 248  * (See CPiA Data sheet p. 31)
 249  *
 250  * "Nibble Stream" mode used by CPiA for uploads to non-ECP ports is a
 251  * nonstandard variant of nibble mode which allows the same (mediocre)
 252  * data flow of 8 bits per cycle as software-enabled ECP by TRISTATE-capable
 253  * parallel ports, but works also for  non-TRISTATE-capable ports.
 254  * (Standard nibble mode only send 4 bits per cycle)
 255  *
 256  */
 257
 258 static size_t cpia_read_nibble_stream(struct parport *port,
 259                                void *buffer, size_t len,
 260                                int flags)
 261 {
 262         int i;
 263         unsigned char *buf = buffer;
 264         int endseen = 0;
 265
 266         for (i=0; i < len; i++) {
 267                 unsigned char nibble[2], byte = 0;
 268                 int j;
 269
 270                 /* Image Data is complete when 4 consecutive EOI bytes (0xff) are seen */
 271                 if (endseen > 3 )
 272                         break;
 273
 274                 /* Event 7: Set nAutoFd low. */
 275                 parport_frob_control (port,
 276                                       PARPORT_CONTROL_AUTOFD,
 277                                       PARPORT_CONTROL_AUTOFD);
 278
 279                 /* Event 9: nAck goes low. */
 280                 port->ieee1284.phase = IEEE1284_PH_REV_DATA;
 281                 if (parport_wait_peripheral (port,
 282                                              PARPORT_STATUS_ACK, 0)) {
 283                         /* Timeout -- no more data? */
 284                                  DBG("%s: Nibble timeout at event 9 (%d bytes)\n",
 285                                  port->name, i/2);
 286                         parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
 287                         break;
 288                 }
 289
 290                 /* Read lower nibble */
 291                 nibble[0] = parport_read_status (port) >>3;
 292
 293                 /* Event 10: Set nAutoFd high. */
 294                 parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
 295
 296                 /* Event 11: nAck goes high. */
 297                 if (parport_wait_peripheral (port,
 298                                              PARPORT_STATUS_ACK,
 299                                              PARPORT_STATUS_ACK)) {
 300                         /* Timeout -- no more data? */
 301                         DBG("%s: Nibble timeout at event 11\n",
 302                                  port->name);
 303                         break;
 304                 }
 305
 306                 /* Read upper nibble */
 307                 nibble[1] = parport_read_status (port) >>3;
 308
 309                 /* reassemble the byte */
 310                 for (j = 0; j < 2 ; j++ ) {
 311                         nibble[j] &= ~8;
 312                         if ((nibble[j] & 0x10) == 0)
 313                                 nibble[j] |= 8;
 314                         nibble[j] &= 0xf;
 315                 }
 316                 byte = (nibble[0] |(nibble[1] << 4));
 317                 *buf++ = byte;
 318
 319                 if(byte == EOI)
 320                   endseen++;
 321                 else
 322                   endseen = 0;
 323         }
 324         return i;
 325 }
 326
 327 /****************************************************************************
 328  *
 329  *  EndTransferMode
 330  *
 331  ***************************************************************************/
 332 static void EndTransferMode(struct pp_cam_entry *cam)
 333 {
 334         parport_negotiate(cam->port, IEEE1284_MODE_COMPAT);
 335 }
 336
 337 /****************************************************************************
 338  *
 339  *  ForwardSetup
 340  *
 341  ***************************************************************************/
 342 static int ForwardSetup(struct pp_cam_entry *cam)
 343 {
 344         int retry;
 345
 346         /* The CPiA uses ECP protocol for Downloads from the Host to the camera.
 347          * This will be software-emulated if ECP hardware is not present
 348          */
 349
 350         /* the usual camera maximum response time is 10ms, but after receiving
 351          * some commands, it needs up to 40ms. (Data Sheet p. 32)*/
 352
 353         for(retry = 0; retry < 4; ++retry) {
 354                 if(!parport_negotiate(cam->port, IEEE1284_MODE_ECP)) {
 355                         break;
 356                 }
 357                 mdelay(10);
 358         }
 359         if(retry == 4) {
 360                 DBG("Unable to negotiate IEEE1284 ECP Download mode\n");
 361                 return -1;
 362         }
 363         return 0;
 364 }
 365 /****************************************************************************
 366  *
 367  *  ReverseSetup
 368  *
 369  ***************************************************************************/
 370 static int ReverseSetup(struct pp_cam_entry *cam, int extensibility)
 371 {
 372         int retry;
 373         int upload_mode, mode = IEEE1284_MODE_ECP;
 374         int transfer_mode = ECP_TRANSFER;
 375
 376         if (!(cam->port->modes & PARPORT_MODE_ECP) &&
 377              !(cam->port->modes & PARPORT_MODE_TRISTATE)) {
 378                 mode = IEEE1284_MODE_NIBBLE;
 379                 transfer_mode = NIBBLE_TRANSFER;
 380         }
 381
 382         upload_mode = mode;
 383         if(extensibility) mode = UPLOAD_FLAG|transfer_mode|IEEE1284_EXT_LINK;
 384
 385         /* the usual camera maximum response time is 10ms, but after
 386          * receiving some commands, it needs up to 40ms. */
 387
 388         for(retry = 0; retry < 4; ++retry) {
 389                 if(!parport_negotiate(cam->port, mode)) {
 390                         break;
 391                 }
 392                 mdelay(10);
 393         }
 394         if(retry == 4) {
 395                 if(extensibility)
 396                         DBG("Unable to negotiate upload extensibility mode\n");
 397                 else
 398                         DBG("Unable to negotiate upload mode\n");
 399                 return -1;
 400         }
 401         if(extensibility) cam->port->ieee1284.mode = upload_mode;
 402         return 0;
 403 }
 404
 405 /****************************************************************************
 406  *
 407  *  WritePacket
 408  *
 409  ***************************************************************************/
 410 static int WritePacket(struct pp_cam_entry *cam, const u8 *packet, size_t size)
 411 {
 412         int retval=0;
 413         int size_written;
 414
 415         if (packet == NULL) {
 416                 return -EINVAL;
 417         }
 418         if (ForwardSetup(cam)) {
 419                 DBG("Write failed in setup\n");
 420                 return -EIO;
 421         }
 422         size_written = parport_write(cam->port, packet, size);
 423         if(size_written != size) {
 424                 DBG("Write failed, wrote %d/%d\n", size_written, size);
 425                 retval = -EIO;
 426         }
 427         EndTransferMode(cam);
 428         return retval;
 429 }
 430
 431 /****************************************************************************
 432  *
 433  *  ReadPacket
 434  *
 435  ***************************************************************************/
 436 static int ReadPacket(struct pp_cam_entry *cam, u8 *packet, size_t size)
 437 {
 438         int retval=0;
 439
 440         if (packet == NULL) {
 441                 return -EINVAL;
 442         }
 443         if (ReverseSetup(cam, 0)) {
 444                 return -EIO;
 445         }
 446
 447         /* support for CPiA variant nibble reads */
 448         if(cam->port->ieee1284.mode == IEEE1284_MODE_NIBBLE) {
 449                 if(cpia_read_nibble(cam->port, packet, size, 0) != size)
 450                         retval = -EIO;
 451         } else {
 452                 if(parport_read(cam->port, packet, size) != size)
 453                         retval = -EIO;
 454         }
 455         EndTransferMode(cam);
 456         return retval;
 457 }
 458
 459 /****************************************************************************
 460  *
 461  *  cpia_pp_streamStart
 462  *
 463  ***************************************************************************/
 464 static int cpia_pp_streamStart(void *privdata)
 465 {
 466         struct pp_cam_entry *cam = privdata;
 467         DBG("\n");
 468         cam->streaming=1;
 469         cam->image_ready=0;
 470         //if (ReverseSetup(cam,1)) return -EIO;
 471         if(cam->stream_irq) cpia_parport_enable_irq(cam->port);
 472         return 0;
 473 }
 474
 475 /****************************************************************************
 476  *
 477  *  cpia_pp_streamStop
 478  *
 479  ***************************************************************************/
 480 static int cpia_pp_streamStop(void *privdata)
 481 {
 482         struct pp_cam_entry *cam = privdata;
 483
 484         DBG("\n");
 485         cam->streaming=0;
 486         cpia_parport_disable_irq(cam->port);
 487         //EndTransferMode(cam);
 488
 489         return 0;
 490 }
 491
 492 /****************************************************************************
 493  *
 494  *  cpia_pp_streamRead
 495  *
 496  ***************************************************************************/
 497 static int cpia_pp_read(struct parport *port, u8 *buffer, int len)
 498 {
 499         int bytes_read;
 500
 501         /* support for CPiA variant "nibble stream" reads */
 502         if(port->ieee1284.mode == IEEE1284_MODE_NIBBLE)
 503                 bytes_read = cpia_read_nibble_stream(port,buffer,len,0);
 504         else {
 505                 int new_bytes;
 506                 for(bytes_read=0; bytes_read<len; bytes_read += new_bytes) {
 507                         new_bytes = parport_read(port, buffer+bytes_read,
 508                                                  len-bytes_read);
 509                         if(new_bytes < 0) break;
 510                 }
 511         }
 512         return bytes_read;
 513 }
 514
 515 static int cpia_pp_streamRead(void *privdata, u8 *buffer, int noblock)
 516 {
 517         struct pp_cam_entry *cam = privdata;
 518         int read_bytes = 0;
 519         int i, endseen, block_size, new_bytes;
 520
 521         if(cam == NULL) {
 522                 DBG("Internal driver error: cam is NULL\n");
 523                 return -EINVAL;
 524         }
 525         if(buffer == NULL) {
 526                 DBG("Internal driver error: buffer is NULL\n");
 527                 return -EINVAL;
 528         }
 529         //if(cam->streaming) DBG("%d / %d\n", cam->image_ready, noblock);
 530         if( cam->stream_irq ) {
 531                 DBG("%d\n", cam->image_ready);
 532                 cam->image_ready--;
 533         }
 534         cam->image_complete=0;
 535         if (0/*cam->streaming*/) {
 536                 if(!cam->image_ready) {
 537                         if(noblock) return -EWOULDBLOCK;
 538                         interruptible_sleep_on(&cam->wq_stream);
 539                         if( signal_pending(current) ) return -EINTR;
 540                         DBG("%d\n", cam->image_ready);
 541                 }
 542         } else {
 543                 if (ReverseSetup(cam, 1)) {
 544                         DBG("unable to ReverseSetup\n");
 545                         return -EIO;
 546                 }
 547         }
 548         endseen = 0;
 549         block_size = PARPORT_CHUNK_SIZE;
 550         while( !cam->image_complete ) {
 551                 cond_resched();
 552
 553                 new_bytes = cpia_pp_read(cam->port, buffer, block_size );
 554                 if( new_bytes <= 0 ) {
 555                         break;
 556                 }
 557                 i=-1;
 558                 while(++i<new_bytes && endseen<4) {
 559                         if(*buffer==EOI) {
 560                                 endseen++;
 561                         } else {
 562                                 endseen=0;
 563                         }
 564                         buffer++;
 565                 }
 566                 read_bytes += i;
 567                 if( endseen==4 ) {
 568                         cam->image_complete=1;
 569                         break;
 570                 }
 571                 if( CPIA_MAX_IMAGE_SIZE-read_bytes <= PARPORT_CHUNK_SIZE ) {
 572                         block_size=CPIA_MAX_IMAGE_SIZE-read_bytes;
 573                 }
 574         }
 575         EndTransferMode(cam);
 576         return cam->image_complete ? read_bytes : -EIO;
 577 }
 578 /****************************************************************************
 579  *
 580  *  cpia_pp_transferCmd
 581  *
 582  ***************************************************************************/
 583 static int cpia_pp_transferCmd(void *privdata, u8 *command, u8 *data)
 584 {
 585         int err;
 586         int retval=0;
 587         int databytes;
 588         struct pp_cam_entry *cam = privdata;
 589
 590         if(cam == NULL) {
 591                 DBG("Internal driver error: cam is NULL\n");
 592                 return -EINVAL;
 593         }
 594         if(command == NULL) {
 595                 DBG("Internal driver error: command is NULL\n");
 596                 return -EINVAL;
 597         }
 598         databytes = (((int)command[7])<<8) | command[6];
 599         if ((err = WritePacket(cam, command, PACKET_LENGTH)) < 0) {
 600                 DBG("Error writing command\n");
 601                 return err;
 602         }
 603         if(command[0] == DATA_IN) {
 604                 u8 buffer[8];
 605                 if(data == NULL) {
 606                         DBG("Internal driver error: data is NULL\n");
 607                         return -EINVAL;
 608                 }
 609                 if((err = ReadPacket(cam, buffer, 8)) < 0) {
 610                         DBG("Error reading command result\n");
 611                        return err;
 612                 }
 613                 memcpy(data, buffer, databytes);
 614         } else if(command[0] == DATA_OUT) {
 615                 if(databytes > 0) {
 616                         if(data == NULL) {
 617                                 DBG("Internal driver error: data is NULL\n");
 618                                 retval = -EINVAL;
 619                         } else {
 620                                 if((err=WritePacket(cam, data, databytes)) < 0){
 621                                         DBG("Error writing command data\n");
 622                                         return err;
 623                                 }
 624                         }
 625                 }
 626         } else {
 627                 DBG("Unexpected first byte of command: %x\n", command[0]);
 628                 retval = -EINVAL;
 629         }
 630         return retval;
 631 }
 632
 633 /****************************************************************************
 634  *
 635  *  cpia_pp_open
 636  *
 637  ***************************************************************************/
 638 static int cpia_pp_open(void *privdata)
 639 {
 640         struct pp_cam_entry *cam = (struct pp_cam_entry *)privdata;
 641
 642         if (cam == NULL)
 643                 return -EINVAL;
 644
 645         if(cam->open_count == 0) {
 646                 if (parport_claim(cam->pdev)) {
 647                         DBG("failed to claim the port\n");
 648                         return -EBUSY;
 649                 }
 650                 parport_negotiate(cam->port, IEEE1284_MODE_COMPAT);
 651                 parport_data_forward(cam->port);
 652                 parport_write_control(cam->port, PARPORT_CONTROL_SELECT);
 653                 udelay(50);
 654                 parport_write_control(cam->port,
 655                                       PARPORT_CONTROL_SELECT
 656                                       | PARPORT_CONTROL_INIT);
 657         }
 658
 659         ++cam->open_count;
 660
 661         return 0;
 662 }
 663
 664 /****************************************************************************
 665  *
 666  *  cpia_pp_registerCallback
 667  *
 668  ***************************************************************************/
 669 static int cpia_pp_registerCallback(void *privdata, void (*cb)(void *cbdata), void *cbdata)
 670 {
 671         struct pp_cam_entry *cam = privdata;
 672         int retval = 0;
 673
 674         if(cam->port->irq != PARPORT_IRQ_NONE) {
 675                 cam->cb_func = cb;
 676                 cam->cb_data = cbdata;
 677                 INIT_WORK(&cam->cb_task, cpia_pp_run_callback);
 678         } else {
 679                 retval = -1;
 680         }
 681         return retval;
 682 }
 683
 684 /****************************************************************************
 685  *
 686  *  cpia_pp_close
 687  *
 688  ***************************************************************************/
 689 static int cpia_pp_close(void *privdata)
 690 {
 691         struct pp_cam_entry *cam = privdata;
 692         if (--cam->open_count == 0) {
 693                 parport_release(cam->pdev);
 694         }
 695         return 0;
 696 }
 697
 698 /****************************************************************************
 699  *
 700  *  cpia_pp_register
 701  *
 702  ***************************************************************************/
 703 static int cpia_pp_register(struct parport *port)
 704 {
 705         struct pardevice *pdev = NULL;
 706         struct pp_cam_entry *cam;
 707         struct cam_data *cpia;
 708
 709         if (!(port->modes & PARPORT_MODE_PCSPP)) {
 710                 LOG("port is not supported by CPiA driver\n");
 711                 return -ENXIO;
 712         }
 713
 714         cam = kzalloc(sizeof(struct pp_cam_entry), GFP_KERNEL);
 715         if (cam == NULL) {
 716                 LOG("failed to allocate camera structure\n");
 717                 return -ENOMEM;
 718         }
 719
 720         pdev = parport_register_device(port, "cpia_pp", NULL, NULL,
 721                                        NULL, 0, cam);
 722
 723         if (!pdev) {
 724                 LOG("failed to parport_register_device\n");
 725                 kfree(cam);
 726                 return -ENXIO;
 727         }
 728
 729         cam->pdev = pdev;
 730         cam->port = port;
 731         init_waitqueue_head(&cam->wq_stream);
 732
 733         cam->streaming = 0;
 734         cam->stream_irq = 0;
 735
 736         if((cpia = cpia_register_camera(&cpia_pp_ops, cam)) == NULL) {
 737                 LOG("failed to cpia_register_camera\n");
 738                 parport_unregister_device(pdev);
 739                 kfree(cam);
 740                 return -ENXIO;
 741         }
 742         spin_lock( &cam_list_lock_pp );
 743         list_add( &cpia->cam_data_list, &cam_list );
 744         spin_unlock( &cam_list_lock_pp );
 745
 746         return 0;
 747 }
 748
 749 static void cpia_pp_detach (struct parport *port)
 750 {
 751         struct list_head *tmp;
 752         struct cam_data *cpia = NULL;
 753         struct pp_cam_entry *cam;
 754
 755         spin_lock( &cam_list_lock_pp );
 756         list_for_each (tmp, &cam_list) {
 757                 cpia = list_entry(tmp, struct cam_data, cam_data_list);
 758                 cam = (struct pp_cam_entry *) cpia->lowlevel_data;
 759                 if (cam && cam->port->number == port->number) {
 760                         list_del(&cpia->cam_data_list);
 761                         break;
 762                 }
 763                 cpia = NULL;
 764         }
 765         spin_unlock( &cam_list_lock_pp );
 766
 767         if (!cpia) {
 768                 DBG("cpia_pp_detach failed to find cam_data in cam_list\n");
 769                 return;
 770         }
 771
 772         cam = (struct pp_cam_entry *) cpia->lowlevel_data;
 773         cpia_unregister_camera(cpia);
 774         if(cam->open_count > 0)
 775                 cpia_pp_close(cam);
 776         parport_unregister_device(cam->pdev);
 777         cpia->lowlevel_data = NULL;
 778         kfree(cam);
 779 }
 780
 781 static void cpia_pp_attach (struct parport *port)
 782 {
 783         unsigned int i;
 784
 785         switch (parport_nr[0])
 786         {
 787         case PPCPIA_PARPORT_UNSPEC:
 788         case PPCPIA_PARPORT_AUTO:
 789                 if (port->probe_info[0].class != PARPORT_CLASS_MEDIA ||
 790                     port->probe_info[0].cmdset == NULL ||
 791                     strncmp(port->probe_info[0].cmdset, "CPIA_1", 6) != 0)
 792                         return;
 793
 794                 cpia_pp_register(port);
 795
 796                 break;
 797
 798         default:
 799                 for (i = 0; i < PARPORT_MAX; ++i) {
 800                         if (port->number == parport_nr[i]) {
 801                                 cpia_pp_register(port);
 802                                 break;
 803                         }
 804                 }
 805                 break;
 806         }
 807 }
 808
 809 static struct parport_driver cpia_pp_driver = {
 810         .name = "cpia_pp",
 811         .attach = cpia_pp_attach,
 812         .detach = cpia_pp_detach,
 813 };
 814
 815 static int __init cpia_pp_init(void)
 816 {
 817         printk(KERN_INFO "%s v%d.%d.%d\n",ABOUT,
 818                CPIA_PP_MAJ_VER,CPIA_PP_MIN_VER,CPIA_PP_PATCH_VER);
 819
 820         if(parport_nr[0] == PPCPIA_PARPORT_OFF) {
 821                 printk("  disabled\n");
 822                 return 0;
 823         }
 824
 825         spin_lock_init( &cam_list_lock_pp );
 826
 827         if (parport_register_driver (&cpia_pp_driver)) {
 828                 LOG ("unable to register with parport\n");
 829                 return -EIO;
 830         }
 831         return 0;
 832 }
 833
 834 static int __init cpia_init(void)
 835 {
 836         if (parport[0]) {
 837                 /* The user gave some parameters.  Let's see what they were. */
 838                 if (!strncmp(parport[0], "auto", 4)) {
 839                         parport_nr[0] = PPCPIA_PARPORT_AUTO;
 840                 } else {
 841                         int n;
 842                         for (n = 0; n < PARPORT_MAX && parport[n]; n++) {
 843                                 if (!strncmp(parport[n], "none", 4)) {
 844                                         parport_nr[n] = PPCPIA_PARPORT_NONE;
 845                                 } else {
 846                                         char *ep;
 847                                         unsigned long r = simple_strtoul(parport[n], &ep, 0);
 848                                         if (ep != parport[n]) {
 849                                                 parport_nr[n] = r;
 850                                         } else {
 851                                                 LOG("bad port specifier `%s'\n", parport[n]);
 852                                                 return -ENODEV;
 853                                         }
 854                                 }
 855                         }
 856                 }
 857         }
 858         return cpia_pp_init();
 859 }
 860
 861 static void __exit cpia_cleanup(void)
 862 {
 863         parport_unregister_driver(&cpia_pp_driver);
 864         return;
 865 }
 866
 867 module_init(cpia_init);
 868 module_exit(cpia_cleanup);