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 #include <linux/config.h>
  29
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32
  33 #include <linux/kernel.h>
  34 #include <linux/parport.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/delay.h>
  37 #include <linux/workqueue.h>
  38 #include <linux/smp_lock.h>
  39 #include <linux/sched.h>
  40
  41 #include <linux/kmod.h>
  42
  43 /* #define _CPIA_DEBUG_         define for verbose debug output */
  44 #include "cpia.h"
  45
  46 static int cpia_pp_open(void *privdata);
  47 static int cpia_pp_registerCallback(void *privdata, void (*cb) (void *cbdata),
  48                                     void *cbdata);
  49 static int cpia_pp_transferCmd(void *privdata, u8 *command, u8 *data);
  50 static int cpia_pp_streamStart(void *privdata);
  51 static int cpia_pp_streamStop(void *privdata);
  52 static int cpia_pp_streamRead(void *privdata, u8 *buffer, int noblock);
  53 static int cpia_pp_close(void *privdata);
  54
  55
  56 #define ABOUT "Parallel port driver for Vision CPiA based cameras"
  57
  58 #define PACKET_LENGTH  8
  59
  60 /* Magic numbers for defining port-device mappings */
  61 #define PPCPIA_PARPORT_UNSPEC -4
  62 #define PPCPIA_PARPORT_AUTO -3
  63 #define PPCPIA_PARPORT_OFF -2
  64 #define PPCPIA_PARPORT_NONE -1
  65
  66 #ifdef MODULE
  67 static int parport_nr[PARPORT_MAX] = {[0 ... PARPORT_MAX - 1] = PPCPIA_PARPORT_UNSPEC};
  68 static char *parport[PARPORT_MAX] = {NULL,};
  69
  70 MODULE_AUTHOR("B. Huisman <bhuism@cs.utwente.nl> & Peter Pregler <Peter_Pregler@email.com>");
  71 MODULE_DESCRIPTION("Parallel port driver for Vision CPiA based cameras");
  72 MODULE_LICENSE("GPL");
  73
  74 module_param_array(parport, charp, NULL, 0);
  75 MODULE_PARM_DESC(parport, "'auto' or a list of parallel port numbers. Just like lp.");
  76 #else
  77 static int parport_nr[PARPORT_MAX] __initdata =
  78         {[0 ... PARPORT_MAX - 1] = PPCPIA_PARPORT_UNSPEC};
  79 static int parport_ptr = 0;
  80 #endif
  81
  82 struct pp_cam_entry {
  83         struct pardevice *pdev;
  84         struct parport *port;
  85         struct work_struct cb_task;
  86         int open_count;
  87         wait_queue_head_t wq_stream;
  88         /* image state flags */
  89         int image_ready;        /* we got an interrupt */
  90         int image_complete;     /* we have seen 4 EOI */
  91
  92         int streaming; /* we are in streaming mode */
  93         int stream_irq;
  94 };
  95
  96 static struct cpia_camera_ops cpia_pp_ops =
  97 {
  98         cpia_pp_open,
  99         cpia_pp_registerCallback,
 100         cpia_pp_transferCmd,
 101         cpia_pp_streamStart,
 102         cpia_pp_streamStop,
 103         cpia_pp_streamRead,
 104         cpia_pp_close,
 105         1,
 106         THIS_MODULE
 107 };
 108
 109 static LIST_HEAD(cam_list);
 110 static spinlock_t cam_list_lock_pp;
 111
 112 /* FIXME */
 113 static void cpia_parport_enable_irq( struct parport *port ) {
 114         parport_enable_irq(port);
 115         mdelay(10);
 116         return;
 117 }
 118
 119 static void cpia_parport_disable_irq( struct parport *port ) {
 120         parport_disable_irq(port);
 121         mdelay(10);
 122         return;
 123 }
 124
 125 /* Special CPiA PPC modes: These are invoked by using the 1284 Extensibility
 126  * Link Flag during negotiation */
 127 #define UPLOAD_FLAG  0x08
 128 #define NIBBLE_TRANSFER 0x01
 129 #define ECP_TRANSFER 0x03
 130
 131 #define PARPORT_CHUNK_SIZE      PAGE_SIZE
 132
 133
 134 /****************************************************************************
 135  *
 136  *  CPiA-specific  low-level parport functions for nibble uploads
 137  *
 138  ***************************************************************************/
 139 /*  CPiA nonstandard "Nibble" mode (no nDataAvail signal after each byte). */
 140 /* The standard kernel parport_ieee1284_read_nibble() fails with the CPiA... */
 141
 142 static size_t cpia_read_nibble (struct parport *port,
 143                          void *buffer, size_t len,
 144                          int flags)
 145 {
 146         /* adapted verbatim, with one change, from
 147            parport_ieee1284_read_nibble() in drivers/parport/ieee1284-ops.c */
 148
 149         unsigned char *buf = buffer;
 150         int i;
 151         unsigned char byte = 0;
 152
 153         len *= 2; /* in nibbles */
 154         for (i=0; i < len; i++) {
 155                 unsigned char nibble;
 156
 157                 /* The CPiA firmware suppresses the use of nDataAvail (nFault LO)
 158                  * after every second nibble to signal that more
 159                  * data is available.  (the total number of Bytes that
 160                  * should be sent is known; if too few are received, an error
 161                  * will be recorded after a timeout).
 162                  * This is incompatible with parport_ieee1284_read_nibble(),
 163                  * which expects to find nFault LO after every second nibble.
 164                  */
 165
 166                 /* Solution: modify cpia_read_nibble to only check for
 167                  * nDataAvail before the first nibble is sent.
 168                  */
 169
 170                 /* Does the error line indicate end of data? */
 171                 if (((i /*& 1*/) == 0) &&
 172                     (parport_read_status(port) & PARPORT_STATUS_ERROR)) {
 173                         DBG("%s: No more nibble data (%d bytes)\n",
 174                             port->name, i/2);
 175                         goto end_of_data;
 176                 }
 177
 178                 /* Event 7: Set nAutoFd low. */
 179                 parport_frob_control (port,
 180                                       PARPORT_CONTROL_AUTOFD,
 181                                       PARPORT_CONTROL_AUTOFD);
 182
 183                 /* Event 9: nAck goes low. */
 184                 port->ieee1284.phase = IEEE1284_PH_REV_DATA;
 185                 if (parport_wait_peripheral (port,
 186                                              PARPORT_STATUS_ACK, 0)) {
 187                         /* Timeout -- no more data? */
 188                                  DBG("%s: Nibble timeout at event 9 (%d bytes)\n",
 189                                  port->name, i/2);
 190                         parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
 191                         break;
 192                 }
 193
 194
 195                 /* Read a nibble. */
 196                 nibble = parport_read_status (port) >> 3;
 197                 nibble &= ~8;
 198                 if ((nibble & 0x10) == 0)
 199                         nibble |= 8;
 200                 nibble &= 0xf;
 201
 202                 /* Event 10: Set nAutoFd high. */
 203                 parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
 204
 205                 /* Event 11: nAck goes high. */
 206                 if (parport_wait_peripheral (port,
 207                                              PARPORT_STATUS_ACK,
 208                                              PARPORT_STATUS_ACK)) {
 209                         /* Timeout -- no more data? */
 210                         DBG("%s: Nibble timeout at event 11\n",
 211                                  port->name);
 212                         break;
 213                 }
 214
 215                 if (i & 1) {
 216                         /* Second nibble */
 217                         byte |= nibble << 4;
 218                         *buf++ = byte;
 219                 } else
 220                         byte = nibble;
 221         }
 222
 223         if (i == len) {
 224                 /* Read the last nibble without checking data avail. */
 225                 if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
 226                 end_of_data:
 227                         /* Go to reverse idle phase. */
 228                         parport_frob_control (port,
 229                                               PARPORT_CONTROL_AUTOFD,
 230                                               PARPORT_CONTROL_AUTOFD);
 231                         port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
 232                 }
 233                 else
 234                         port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
 235         }
 236
 237         return i/2;
 238 }
 239
 240 /* CPiA nonstandard "Nibble Stream" mode (2 nibbles per cycle, instead of 1)
 241  * (See CPiA Data sheet p. 31)
 242  *
 243  * "Nibble Stream" mode used by CPiA for uploads to non-ECP ports is a
 244  * nonstandard variant of nibble mode which allows the same (mediocre)
 245  * data flow of 8 bits per cycle as software-enabled ECP by TRISTATE-capable
 246  * parallel ports, but works also for  non-TRISTATE-capable ports.
 247  * (Standard nibble mode only send 4 bits per cycle)
 248  *
 249  */
 250
 251 static size_t cpia_read_nibble_stream(struct parport *port,
 252                                void *buffer, size_t len,
 253                                int flags)
 254 {
 255         int i;
 256         unsigned char *buf = buffer;
 257         int endseen = 0;
 258
 259         for (i=0; i < len; i++) {
 260                 unsigned char nibble[2], byte = 0;
 261                 int j;
 262
 263                 /* Image Data is complete when 4 consecutive EOI bytes (0xff) are seen */
 264                 if (endseen > 3 )
 265                         break;
 266
 267                 /* Event 7: Set nAutoFd low. */
 268                 parport_frob_control (port,
 269                                       PARPORT_CONTROL_AUTOFD,
 270                                       PARPORT_CONTROL_AUTOFD);
 271
 272                 /* Event 9: nAck goes low. */
 273                 port->ieee1284.phase = IEEE1284_PH_REV_DATA;
 274                 if (parport_wait_peripheral (port,
 275                                              PARPORT_STATUS_ACK, 0)) {
 276                         /* Timeout -- no more data? */
 277                                  DBG("%s: Nibble timeout at event 9 (%d bytes)\n",
 278                                  port->name, i/2);
 279                         parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
 280                         break;
 281                 }
 282
 283                 /* Read lower nibble */
 284                 nibble[0] = parport_read_status (port) >>3;
 285
 286                 /* Event 10: Set nAutoFd high. */
 287                 parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
 288
 289                 /* Event 11: nAck goes high. */
 290                 if (parport_wait_peripheral (port,
 291                                              PARPORT_STATUS_ACK,
 292                                              PARPORT_STATUS_ACK)) {
 293                         /* Timeout -- no more data? */
 294                         DBG("%s: Nibble timeout at event 11\n",
 295                                  port->name);
 296                         break;
 297                 }
 298
 299                 /* Read upper nibble */
 300                 nibble[1] = parport_read_status (port) >>3;
 301
 302                 /* reassemble the byte */
 303                 for (j = 0; j < 2 ; j++ ) {
 304                         nibble[j] &= ~8;
 305                         if ((nibble[j] & 0x10) == 0)
 306                                 nibble[j] |= 8;
 307                         nibble[j] &= 0xf;
 308                 }
 309                 byte = (nibble[0] |(nibble[1] << 4));
 310                 *buf++ = byte;
 311
 312                 if(byte == EOI)
 313                   endseen++;
 314                 else
 315                   endseen = 0;
 316         }
 317         return i;
 318 }
 319
 320 /****************************************************************************
 321  *
 322  *  EndTransferMode
 323  *
 324  ***************************************************************************/
 325 static void EndTransferMode(struct pp_cam_entry *cam)
 326 {
 327         parport_negotiate(cam->port, IEEE1284_MODE_COMPAT);
 328 }
 329
 330 /****************************************************************************
 331  *
 332  *  ForwardSetup
 333  *
 334  ***************************************************************************/
 335 static int ForwardSetup(struct pp_cam_entry *cam)
 336 {
 337         int retry;
 338
 339         /* The CPiA uses ECP protocol for Downloads from the Host to the camera.
 340          * This will be software-emulated if ECP hardware is not present
 341          */
 342
 343         /* the usual camera maximum response time is 10ms, but after receiving
 344          * some commands, it needs up to 40ms. (Data Sheet p. 32)*/
 345
 346         for(retry = 0; retry < 4; ++retry) {
 347                 if(!parport_negotiate(cam->port, IEEE1284_MODE_ECP)) {
 348                         break;
 349                 }
 350                 mdelay(10);
 351         }
 352         if(retry == 4) {
 353                 DBG("Unable to negotiate IEEE1284 ECP Download mode\n");
 354                 return -1;
 355         }
 356         return 0;
 357 }
 358 /****************************************************************************
 359  *
 360  *  ReverseSetup
 361  *
 362  ***************************************************************************/
 363 static int ReverseSetup(struct pp_cam_entry *cam, int extensibility)
 364 {
 365         int retry;
 366         int upload_mode, mode = IEEE1284_MODE_ECP;
 367         int transfer_mode = ECP_TRANSFER;
 368
 369         if (!(cam->port->modes & PARPORT_MODE_ECP) &&
 370              !(cam->port->modes & PARPORT_MODE_TRISTATE)) {
 371                 mode = IEEE1284_MODE_NIBBLE;
 372                 transfer_mode = NIBBLE_TRANSFER;
 373         }
 374
 375         upload_mode = mode;
 376         if(extensibility) mode = UPLOAD_FLAG|transfer_mode|IEEE1284_EXT_LINK;
 377
 378         /* the usual camera maximum response time is 10ms, but after
 379          * receiving some commands, it needs up to 40ms. */
 380
 381         for(retry = 0; retry < 4; ++retry) {
 382                 if(!parport_negotiate(cam->port, mode)) {
 383                         break;
 384                 }
 385                 mdelay(10);
 386         }
 387         if(retry == 4) {
 388                 if(extensibility)
 389                         DBG("Unable to negotiate upload extensibility mode\n");
 390                 else
 391                         DBG("Unable to negotiate upload mode\n");
 392                 return -1;
 393         }
 394         if(extensibility) cam->port->ieee1284.mode = upload_mode;
 395         return 0;
 396 }
 397
 398 /****************************************************************************
 399  *
 400  *  WritePacket
 401  *
 402  ***************************************************************************/
 403 static int WritePacket(struct pp_cam_entry *cam, const u8 *packet, size_t size)
 404 {
 405         int retval=0;
 406         int size_written;
 407
 408         if (packet == NULL) {
 409                 return -EINVAL;
 410         }
 411         if (ForwardSetup(cam)) {
 412                 DBG("Write failed in setup\n");
 413                 return -EIO;
 414         }
 415         size_written = parport_write(cam->port, packet, size);
 416         if(size_written != size) {
 417                 DBG("Write failed, wrote %d/%d\n", size_written, size);
 418                 retval = -EIO;
 419         }
 420         EndTransferMode(cam);
 421         return retval;
 422 }
 423
 424 /****************************************************************************
 425  *
 426  *  ReadPacket
 427  *
 428  ***************************************************************************/
 429 static int ReadPacket(struct pp_cam_entry *cam, u8 *packet, size_t size)
 430 {
 431         int retval=0;
 432
 433         if (packet == NULL) {
 434                 return -EINVAL;
 435         }
 436         if (ReverseSetup(cam, 0)) {
 437                 return -EIO;
 438         }
 439
 440         /* support for CPiA variant nibble reads */
 441         if(cam->port->ieee1284.mode == IEEE1284_MODE_NIBBLE) {
 442                 if(cpia_read_nibble(cam->port, packet, size, 0) != size)
 443                         retval = -EIO;
 444         } else {
 445                 if(parport_read(cam->port, packet, size) != size)
 446                         retval = -EIO;
 447         }
 448         EndTransferMode(cam);
 449         return retval;
 450 }
 451
 452 /****************************************************************************
 453  *
 454  *  cpia_pp_streamStart
 455  *
 456  ***************************************************************************/
 457 static int cpia_pp_streamStart(void *privdata)
 458 {
 459         struct pp_cam_entry *cam = privdata;
 460         DBG("\n");
 461         cam->streaming=1;
 462         cam->image_ready=0;
 463         //if (ReverseSetup(cam,1)) return -EIO;
 464         if(cam->stream_irq) cpia_parport_enable_irq(cam->port);
 465         return 0;
 466 }
 467
 468 /****************************************************************************
 469  *
 470  *  cpia_pp_streamStop
 471  *
 472  ***************************************************************************/
 473 static int cpia_pp_streamStop(void *privdata)
 474 {
 475         struct pp_cam_entry *cam = privdata;
 476
 477         DBG("\n");
 478         cam->streaming=0;
 479         cpia_parport_disable_irq(cam->port);
 480         //EndTransferMode(cam);
 481
 482         return 0;
 483 }
 484
 485 /****************************************************************************
 486  *
 487  *  cpia_pp_streamRead
 488  *
 489  ***************************************************************************/
 490 static int cpia_pp_read(struct parport *port, u8 *buffer, int len)
 491 {
 492         int bytes_read;
 493
 494         /* support for CPiA variant "nibble stream" reads */
 495         if(port->ieee1284.mode == IEEE1284_MODE_NIBBLE)
 496                 bytes_read = cpia_read_nibble_stream(port,buffer,len,0);
 497         else {
 498                 int new_bytes;
 499                 for(bytes_read=0; bytes_read<len; bytes_read += new_bytes) {
 500                         new_bytes = parport_read(port, buffer+bytes_read,
 501                                                  len-bytes_read);
 502                         if(new_bytes < 0) break;
 503                 }
 504         }
 505         return bytes_read;
 506 }
 507
 508 static int cpia_pp_streamRead(void *privdata, u8 *buffer, int noblock)
 509 {
 510         struct pp_cam_entry *cam = privdata;
 511         int read_bytes = 0;
 512         int i, endseen, block_size, new_bytes;
 513
 514         if(cam == NULL) {
 515                 DBG("Internal driver error: cam is NULL\n");
 516                 return -EINVAL;
 517         }
 518         if(buffer == NULL) {
 519                 DBG("Internal driver error: buffer is NULL\n");
 520                 return -EINVAL;
 521         }
 522         //if(cam->streaming) DBG("%d / %d\n", cam->image_ready, noblock);
 523         if( cam->stream_irq ) {
 524                 DBG("%d\n", cam->image_ready);
 525                 cam->image_ready--;
 526         }
 527         cam->image_complete=0;
 528         if (0/*cam->streaming*/) {
 529                 if(!cam->image_ready) {
 530                         if(noblock) return -EWOULDBLOCK;
 531                         interruptible_sleep_on(&cam->wq_stream);
 532                         if( signal_pending(current) ) return -EINTR;
 533                         DBG("%d\n", cam->image_ready);
 534                 }
 535         } else {
 536                 if (ReverseSetup(cam, 1)) {
 537                         DBG("unable to ReverseSetup\n");
 538                         return -EIO;
 539                 }
 540         }
 541         endseen = 0;
 542         block_size = PARPORT_CHUNK_SIZE;
 543         while( !cam->image_complete ) {
 544                 cond_resched();
 545
 546                 new_bytes = cpia_pp_read(cam->port, buffer, block_size );
 547                 if( new_bytes <= 0 ) {
 548                         break;
 549                 }
 550                 i=-1;
 551                 while(++i<new_bytes && endseen<4) {
 552                         if(*buffer==EOI) {
 553                                 endseen++;
 554                         } else {
 555                                 endseen=0;
 556                         }
 557                         buffer++;
 558                 }
 559                 read_bytes += i;
 560                 if( endseen==4 ) {
 561                         cam->image_complete=1;
 562                         break;
 563                 }
 564                 if( CPIA_MAX_IMAGE_SIZE-read_bytes <= PARPORT_CHUNK_SIZE ) {
 565                         block_size=CPIA_MAX_IMAGE_SIZE-read_bytes;
 566                 }
 567         }
 568         EndTransferMode(cam);
 569         return cam->image_complete ? read_bytes : -EIO;
 570 }
 571 /****************************************************************************
 572  *
 573  *  cpia_pp_transferCmd
 574  *
 575  ***************************************************************************/
 576 static int cpia_pp_transferCmd(void *privdata, u8 *command, u8 *data)
 577 {
 578         int err;
 579         int retval=0;
 580         int databytes;
 581         struct pp_cam_entry *cam = privdata;
 582
 583         if(cam == NULL) {
 584                 DBG("Internal driver error: cam is NULL\n");
 585                 return -EINVAL;
 586         }
 587         if(command == NULL) {
 588                 DBG("Internal driver error: command is NULL\n");
 589                 return -EINVAL;
 590         }
 591         databytes = (((int)command[7])<<8) | command[6];
 592         if ((err = WritePacket(cam, command, PACKET_LENGTH)) < 0) {
 593                 DBG("Error writing command\n");
 594                 return err;
 595         }
 596         if(command[0] == DATA_IN) {
 597                 u8 buffer[8];
 598                 if(data == NULL) {
 599                         DBG("Internal driver error: data is NULL\n");
 600                         return -EINVAL;
 601                 }
 602                 if((err = ReadPacket(cam, buffer, 8)) < 0) {
 603                         DBG("Error reading command result\n");
 604                        return err;
 605                 }
 606                 memcpy(data, buffer, databytes);
 607         } else if(command[0] == DATA_OUT) {
 608                 if(databytes > 0) {
 609                         if(data == NULL) {
 610                                 DBG("Internal driver error: data is NULL\n");
 611                                 retval = -EINVAL;
 612                         } else {
 613                                 if((err=WritePacket(cam, data, databytes)) < 0){
 614                                         DBG("Error writing command data\n");
 615                                         return err;
 616                                 }
 617                         }
 618                 }
 619         } else {
 620                 DBG("Unexpected first byte of command: %x\n", command[0]);
 621                 retval = -EINVAL;
 622         }
 623         return retval;
 624 }
 625
 626 /****************************************************************************
 627  *
 628  *  cpia_pp_open
 629  *
 630  ***************************************************************************/
 631 static int cpia_pp_open(void *privdata)
 632 {
 633         struct pp_cam_entry *cam = (struct pp_cam_entry *)privdata;
 634
 635         if (cam == NULL)
 636                 return -EINVAL;
 637
 638         if(cam->open_count == 0) {
 639                 if (parport_claim(cam->pdev)) {
 640                         DBG("failed to claim the port\n");
 641                         return -EBUSY;
 642                 }
 643                 parport_negotiate(cam->port, IEEE1284_MODE_COMPAT);
 644                 parport_data_forward(cam->port);
 645                 parport_write_control(cam->port, PARPORT_CONTROL_SELECT);
 646                 udelay(50);
 647                 parport_write_control(cam->port,
 648                                       PARPORT_CONTROL_SELECT
 649                                       | PARPORT_CONTROL_INIT);
 650         }
 651
 652         ++cam->open_count;
 653
 654         return 0;
 655 }
 656
 657 /****************************************************************************
 658  *
 659  *  cpia_pp_registerCallback
 660  *
 661  ***************************************************************************/
 662 static int cpia_pp_registerCallback(void *privdata, void (*cb)(void *cbdata), void *cbdata)
 663 {
 664         struct pp_cam_entry *cam = privdata;
 665         int retval = 0;
 666
 667         if(cam->port->irq != PARPORT_IRQ_NONE) {
 668                 INIT_WORK(&cam->cb_task, cb, cbdata);
 669         } else {
 670                 retval = -1;
 671         }
 672         return retval;
 673 }
 674
 675 /****************************************************************************
 676  *
 677  *  cpia_pp_close
 678  *
 679  ***************************************************************************/
 680 static int cpia_pp_close(void *privdata)
 681 {
 682         struct pp_cam_entry *cam = privdata;
 683         if (--cam->open_count == 0) {
 684                 parport_release(cam->pdev);
 685         }
 686         return 0;
 687 }
 688
 689 /****************************************************************************
 690  *
 691  *  cpia_pp_register
 692  *
 693  ***************************************************************************/
 694 static int cpia_pp_register(struct parport *port)
 695 {
 696         struct pardevice *pdev = NULL;
 697         struct pp_cam_entry *cam;
 698         struct cam_data *cpia;
 699
 700         if (!(port->modes & PARPORT_MODE_PCSPP)) {
 701                 LOG("port is not supported by CPiA driver\n");
 702                 return -ENXIO;
 703         }
 704
 705         cam = kzalloc(sizeof(struct pp_cam_entry), GFP_KERNEL);
 706         if (cam == NULL) {
 707                 LOG("failed to allocate camera structure\n");
 708                 return -ENOMEM;
 709         }
 710
 711         pdev = parport_register_device(port, "cpia_pp", NULL, NULL,
 712                                        NULL, 0, cam);
 713
 714         if (!pdev) {
 715                 LOG("failed to parport_register_device\n");
 716                 kfree(cam);
 717                 return -ENXIO;
 718         }
 719
 720         cam->pdev = pdev;
 721         cam->port = port;
 722         init_waitqueue_head(&cam->wq_stream);
 723
 724         cam->streaming = 0;
 725         cam->stream_irq = 0;
 726
 727         if((cpia = cpia_register_camera(&cpia_pp_ops, cam)) == NULL) {
 728                 LOG("failed to cpia_register_camera\n");
 729                 parport_unregister_device(pdev);
 730                 kfree(cam);
 731                 return -ENXIO;
 732         }
 733         spin_lock( &cam_list_lock_pp );
 734         list_add( &cpia->cam_data_list, &cam_list );
 735         spin_unlock( &cam_list_lock_pp );
 736
 737         return 0;
 738 }
 739
 740 static void cpia_pp_detach (struct parport *port)
 741 {
 742         struct list_head *tmp;
 743         struct cam_data *cpia = NULL;
 744         struct pp_cam_entry *cam;
 745
 746         spin_lock( &cam_list_lock_pp );
 747         list_for_each (tmp, &cam_list) {
 748                 cpia = list_entry(tmp, struct cam_data, cam_data_list);
 749                 cam = (struct pp_cam_entry *) cpia->lowlevel_data;
 750                 if (cam && cam->port->number == port->number) {
 751                         list_del(&cpia->cam_data_list);
 752                         break;
 753                 }
 754                 cpia = NULL;
 755         }
 756         spin_unlock( &cam_list_lock_pp );
 757
 758         if (!cpia) {
 759                 DBG("cpia_pp_detach failed to find cam_data in cam_list\n");
 760                 return;
 761         }
 762
 763         cam = (struct pp_cam_entry *) cpia->lowlevel_data;
 764         cpia_unregister_camera(cpia);
 765         if(cam->open_count > 0)
 766                 cpia_pp_close(cam);
 767         parport_unregister_device(cam->pdev);
 768         cpia->lowlevel_data = NULL;
 769         kfree(cam);
 770 }
 771
 772 static void cpia_pp_attach (struct parport *port)
 773 {
 774         unsigned int i;
 775
 776         switch (parport_nr[0])
 777         {
 778         case PPCPIA_PARPORT_UNSPEC:
 779         case PPCPIA_PARPORT_AUTO:
 780                 if (port->probe_info[0].class != PARPORT_CLASS_MEDIA ||
 781                     port->probe_info[0].cmdset == NULL ||
 782                     strncmp(port->probe_info[0].cmdset, "CPIA_1", 6) != 0)
 783                         return;
 784
 785                 cpia_pp_register(port);
 786
 787                 break;
 788
 789         default:
 790                 for (i = 0; i < PARPORT_MAX; ++i) {
 791                         if (port->number == parport_nr[i]) {
 792                                 cpia_pp_register(port);
 793                                 break;
 794                         }
 795                 }
 796                 break;
 797         }
 798 }
 799
 800 static struct parport_driver cpia_pp_driver = {
 801         .name = "cpia_pp",
 802         .attach = cpia_pp_attach,
 803         .detach = cpia_pp_detach,
 804 };
 805
 806 int cpia_pp_init(void)
 807 {
 808         printk(KERN_INFO "%s v%d.%d.%d\n",ABOUT,
 809                CPIA_PP_MAJ_VER,CPIA_PP_MIN_VER,CPIA_PP_PATCH_VER);
 810
 811         if(parport_nr[0] == PPCPIA_PARPORT_OFF) {
 812                 printk("  disabled\n");
 813                 return 0;
 814         }
 815
 816         spin_lock_init( &cam_list_lock_pp );
 817
 818         if (parport_register_driver (&cpia_pp_driver)) {
 819                 LOG ("unable to register with parport\n");
 820                 return -EIO;
 821         }
 822         return 0;
 823 }
 824
 825 #ifdef MODULE
 826 int init_module(void)
 827 {
 828         if (parport[0]) {
 829                 /* The user gave some parameters.  Let's see what they were. */
 830                 if (!strncmp(parport[0], "auto", 4)) {
 831                         parport_nr[0] = PPCPIA_PARPORT_AUTO;
 832                 } else {
 833                         int n;
 834                         for (n = 0; n < PARPORT_MAX && parport[n]; n++) {
 835                                 if (!strncmp(parport[n], "none", 4)) {
 836                                         parport_nr[n] = PPCPIA_PARPORT_NONE;
 837                                 } else {
 838                                         char *ep;
 839                                         unsigned long r = simple_strtoul(parport[n], &ep, 0);
 840                                         if (ep != parport[n]) {
 841                                                 parport_nr[n] = r;
 842                                         } else {
 843                                                 LOG("bad port specifier `%s'\n", parport[n]);
 844                                                 return -ENODEV;
 845                                         }
 846                                 }
 847                         }
 848                 }
 849         }
 850         return cpia_pp_init();
 851 }
 852
 853 void cleanup_module(void)
 854 {
 855         parport_unregister_driver (&cpia_pp_driver);
 856         return;
 857 }
 858
 859 #else /* !MODULE */
 860
 861 static int __init cpia_pp_setup(char *str)
 862 {
 863         if (!strncmp(str, "parport", 7)) {
 864                 int n = simple_strtoul(str + 7, NULL, 10);
 865                 if (parport_ptr < PARPORT_MAX) {
 866                         parport_nr[parport_ptr++] = n;
 867                 } else {
 868                         LOG("too many ports, %s ignored.\n", str);
 869                 }
 870         } else if (!strcmp(str, "auto")) {
 871                 parport_nr[0] = PPCPIA_PARPORT_AUTO;
 872         } else if (!strcmp(str, "none")) {
 873                 parport_nr[parport_ptr++] = PPCPIA_PARPORT_NONE;
 874         }
 875
 876         return 0;
 877 }
 878
 879 __setup("cpia_pp=", cpia_pp_setup);
 880
 881 #endif /* !MODULE */