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V4L/DVB (4854): Handle errors from input_register_device()
[linux-2.6/linux-loongson.git] / drivers / media / video / cpia_pp.c
blobb12cec94f4cc917af762dd93d459587b80804240
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/smp_lock.h>
38 #include <linux/sched.h>
39
40 #include <linux/kmod.h>
41
42 /* #define _CPIA_DEBUG_ define for verbose debug output */
43 #include "cpia.h"
44
45 static int cpia_pp_open(void *privdata);
46 static int cpia_pp_registerCallback(void *privdata, void (*cb) (void *cbdata),
47 void *cbdata);
48 static int cpia_pp_transferCmd(void *privdata, u8 *command, u8 *data);
49 static int cpia_pp_streamStart(void *privdata);
50 static int cpia_pp_streamStop(void *privdata);
51 static int cpia_pp_streamRead(void *privdata, u8 *buffer, int noblock);
52 static int cpia_pp_close(void *privdata);
53
54
55 #define ABOUT "Parallel port driver for Vision CPiA based cameras"
56
57 #define PACKET_LENGTH 8
58
59 /* Magic numbers for defining port-device mappings */
60 #define PPCPIA_PARPORT_UNSPEC -4
61 #define PPCPIA_PARPORT_AUTO -3
62 #define PPCPIA_PARPORT_OFF -2
63 #define PPCPIA_PARPORT_NONE -1
64
65 #ifdef MODULE
66 static int parport_nr[PARPORT_MAX] = {[0 ... PARPORT_MAX - 1] = PPCPIA_PARPORT_UNSPEC};
67 static char *parport[PARPORT_MAX] = {NULL,};
68
69 MODULE_AUTHOR("B. Huisman <bhuism@cs.utwente.nl> & Peter Pregler <Peter_Pregler@email.com>");
70 MODULE_DESCRIPTION("Parallel port driver for Vision CPiA based cameras");
71 MODULE_LICENSE("GPL");
72
73 module_param_array(parport, charp, NULL, 0);
74 MODULE_PARM_DESC(parport, "'auto' or a list of parallel port numbers. Just like lp.");
75 #else
76 static int parport_nr[PARPORT_MAX] __initdata =
77 {[0 ... PARPORT_MAX - 1] = PPCPIA_PARPORT_UNSPEC};
78 static int parport_ptr = 0;
79 #endif
80
81 struct pp_cam_entry {
82 struct pardevice *pdev;
83 struct parport *port;
84 struct work_struct cb_task;
85 void (*cb_func)(void *cbdata);
86 void *cb_data;
87 int open_count;
88 wait_queue_head_t wq_stream;
89 /* image state flags */
90 int image_ready; /* we got an interrupt */
91 int image_complete; /* we have seen 4 EOI */
92
93 int streaming; /* we are in streaming mode */
94 int stream_irq;
95 };
96
97 static struct cpia_camera_ops cpia_pp_ops =
98 {
99 cpia_pp_open,
100 cpia_pp_registerCallback,
101 cpia_pp_transferCmd,
102 cpia_pp_streamStart,
103 cpia_pp_streamStop,
104 cpia_pp_streamRead,
105 cpia_pp_close,
106 1,
107 THIS_MODULE
108 };
109
110 static LIST_HEAD(cam_list);
111 static spinlock_t cam_list_lock_pp;
112
113 /* FIXME */
114 static void cpia_parport_enable_irq( struct parport *port ) {
115 parport_enable_irq(port);
116 mdelay(10);
117 return;
118 }
119
120 static void cpia_parport_disable_irq( struct parport *port ) {
121 parport_disable_irq(port);
122 mdelay(10);
123 return;
124 }
125
126 /* Special CPiA PPC modes: These are invoked by using the 1284 Extensibility
127 * Link Flag during negotiation */
128 #define UPLOAD_FLAG 0x08
129 #define NIBBLE_TRANSFER 0x01
130 #define ECP_TRANSFER 0x03
131
132 #define PARPORT_CHUNK_SIZE PAGE_SIZE
133
134
135 static void cpia_pp_run_callback(struct work_struct *work)
136 {
137 void (*cb_func)(void *cbdata);
138 void *cb_data;
139 struct pp_cam_entry *cam;
140
141 cam = container_of(work, struct pp_cam_entry, cb_task);
142 cb_func = cam->cb_func;
143 cb_data = cam->cb_data;
144 work_release(work);
145
146 cb_func(cb_data);
147 }
148
149 /****************************************************************************
150 *
151 * CPiA-specific low-level parport functions for nibble uploads
152 *
153 ***************************************************************************/
154 /* CPiA nonstandard "Nibble" mode (no nDataAvail signal after each byte). */
155 /* The standard kernel parport_ieee1284_read_nibble() fails with the CPiA... */
156
157 static size_t cpia_read_nibble (struct parport *port,
158 void *buffer, size_t len,
159 int flags)
160 {
161 /* adapted verbatim, with one change, from
162 parport_ieee1284_read_nibble() in drivers/parport/ieee1284-ops.c */
163
164 unsigned char *buf = buffer;
165 int i;
166 unsigned char byte = 0;
167
168 len *= 2; /* in nibbles */
169 for (i=0; i < len; i++) {
170 unsigned char nibble;
171
172 /* The CPiA firmware suppresses the use of nDataAvail (nFault LO)
173 * after every second nibble to signal that more
174 * data is available. (the total number of Bytes that
175 * should be sent is known; if too few are received, an error
176 * will be recorded after a timeout).
177 * This is incompatible with parport_ieee1284_read_nibble(),
178 * which expects to find nFault LO after every second nibble.
179 */
180
181 /* Solution: modify cpia_read_nibble to only check for
182 * nDataAvail before the first nibble is sent.
183 */
184
185 /* Does the error line indicate end of data? */
186 if (((i /*& 1*/) == 0) &&
187 (parport_read_status(port) & PARPORT_STATUS_ERROR)) {
188 DBG("%s: No more nibble data (%d bytes)\n",
189 port->name, i/2);
190 goto end_of_data;
191 }
192
193 /* Event 7: Set nAutoFd low. */
194 parport_frob_control (port,
195 PARPORT_CONTROL_AUTOFD,
196 PARPORT_CONTROL_AUTOFD);
197
198 /* Event 9: nAck goes low. */
199 port->ieee1284.phase = IEEE1284_PH_REV_DATA;
200 if (parport_wait_peripheral (port,
201 PARPORT_STATUS_ACK, 0)) {
202 /* Timeout -- no more data? */
203 DBG("%s: Nibble timeout at event 9 (%d bytes)\n",
204 port->name, i/2);
205 parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
206 break;
207 }
208
209
210 /* Read a nibble. */
211 nibble = parport_read_status (port) >> 3;
212 nibble &= ~8;
213 if ((nibble & 0x10) == 0)
214 nibble |= 8;
215 nibble &= 0xf;
216
217 /* Event 10: Set nAutoFd high. */
218 parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
219
220 /* Event 11: nAck goes high. */
221 if (parport_wait_peripheral (port,
222 PARPORT_STATUS_ACK,
223 PARPORT_STATUS_ACK)) {
224 /* Timeout -- no more data? */
225 DBG("%s: Nibble timeout at event 11\n",
226 port->name);
227 break;
228 }
229
230 if (i & 1) {
231 /* Second nibble */
232 byte |= nibble << 4;
233 *buf++ = byte;
234 } else
235 byte = nibble;
236 }
237
238 if (i == len) {
239 /* Read the last nibble without checking data avail. */
240 if (parport_read_status (port) & PARPORT_STATUS_ERROR) {
241 end_of_data:
242 /* Go to reverse idle phase. */
243 parport_frob_control (port,
244 PARPORT_CONTROL_AUTOFD,
245 PARPORT_CONTROL_AUTOFD);
246 port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE;
247 }
248 else
249 port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL;
250 }
251
252 return i/2;
253 }
254
255 /* CPiA nonstandard "Nibble Stream" mode (2 nibbles per cycle, instead of 1)
256 * (See CPiA Data sheet p. 31)
257 *
258 * "Nibble Stream" mode used by CPiA for uploads to non-ECP ports is a
259 * nonstandard variant of nibble mode which allows the same (mediocre)
260 * data flow of 8 bits per cycle as software-enabled ECP by TRISTATE-capable
261 * parallel ports, but works also for non-TRISTATE-capable ports.
262 * (Standard nibble mode only send 4 bits per cycle)
263 *
264 */
265
266 static size_t cpia_read_nibble_stream(struct parport *port,
267 void *buffer, size_t len,
268 int flags)
269 {
270 int i;
271 unsigned char *buf = buffer;
272 int endseen = 0;
273
274 for (i=0; i < len; i++) {
275 unsigned char nibble[2], byte = 0;
276 int j;
277
278 /* Image Data is complete when 4 consecutive EOI bytes (0xff) are seen */
279 if (endseen > 3 )
280 break;
281
282 /* Event 7: Set nAutoFd low. */
283 parport_frob_control (port,
284 PARPORT_CONTROL_AUTOFD,
285 PARPORT_CONTROL_AUTOFD);
286
287 /* Event 9: nAck goes low. */
288 port->ieee1284.phase = IEEE1284_PH_REV_DATA;
289 if (parport_wait_peripheral (port,
290 PARPORT_STATUS_ACK, 0)) {
291 /* Timeout -- no more data? */
292 DBG("%s: Nibble timeout at event 9 (%d bytes)\n",
293 port->name, i/2);
294 parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
295 break;
296 }
297
298 /* Read lower nibble */
299 nibble[0] = parport_read_status (port) >>3;
300
301 /* Event 10: Set nAutoFd high. */
302 parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0);
303
304 /* Event 11: nAck goes high. */
305 if (parport_wait_peripheral (port,
306 PARPORT_STATUS_ACK,
307 PARPORT_STATUS_ACK)) {
308 /* Timeout -- no more data? */
309 DBG("%s: Nibble timeout at event 11\n",
310 port->name);
311 break;
312 }
313
314 /* Read upper nibble */
315 nibble[1] = parport_read_status (port) >>3;
316
317 /* reassemble the byte */
318 for (j = 0; j < 2 ; j++ ) {
319 nibble[j] &= ~8;
320 if ((nibble[j] & 0x10) == 0)
321 nibble[j] |= 8;
322 nibble[j] &= 0xf;
323 }
324 byte = (nibble[0] |(nibble[1] << 4));
325 *buf++ = byte;
326
327 if(byte == EOI)
328 endseen++;
329 else
330 endseen = 0;
331 }
332 return i;
333 }
334
335 /****************************************************************************
336 *
337 * EndTransferMode
338 *
339 ***************************************************************************/
340 static void EndTransferMode(struct pp_cam_entry *cam)
341 {
342 parport_negotiate(cam->port, IEEE1284_MODE_COMPAT);
343 }
344
345 /****************************************************************************
346 *
347 * ForwardSetup
348 *
349 ***************************************************************************/
350 static int ForwardSetup(struct pp_cam_entry *cam)
351 {
352 int retry;
353
354 /* The CPiA uses ECP protocol for Downloads from the Host to the camera.
355 * This will be software-emulated if ECP hardware is not present
356 */
357
358 /* the usual camera maximum response time is 10ms, but after receiving
359 * some commands, it needs up to 40ms. (Data Sheet p. 32)*/
360
361 for(retry = 0; retry < 4; ++retry) {
362 if(!parport_negotiate(cam->port, IEEE1284_MODE_ECP)) {
363 break;
364 }
365 mdelay(10);
366 }
367 if(retry == 4) {
368 DBG("Unable to negotiate IEEE1284 ECP Download mode\n");
369 return -1;
370 }
371 return 0;
372 }
373 /****************************************************************************
374 *
375 * ReverseSetup
376 *
377 ***************************************************************************/
378 static int ReverseSetup(struct pp_cam_entry *cam, int extensibility)
379 {
380 int retry;
381 int upload_mode, mode = IEEE1284_MODE_ECP;
382 int transfer_mode = ECP_TRANSFER;
383
384 if (!(cam->port->modes & PARPORT_MODE_ECP) &&
385 !(cam->port->modes & PARPORT_MODE_TRISTATE)) {
386 mode = IEEE1284_MODE_NIBBLE;
387 transfer_mode = NIBBLE_TRANSFER;
388 }
389
390 upload_mode = mode;
391 if(extensibility) mode = UPLOAD_FLAG|transfer_mode|IEEE1284_EXT_LINK;
392
393 /* the usual camera maximum response time is 10ms, but after
394 * receiving some commands, it needs up to 40ms. */
395
396 for(retry = 0; retry < 4; ++retry) {
397 if(!parport_negotiate(cam->port, mode)) {
398 break;
399 }
400 mdelay(10);
401 }
402 if(retry == 4) {
403 if(extensibility)
404 DBG("Unable to negotiate upload extensibility mode\n");
405 else
406 DBG("Unable to negotiate upload mode\n");
407 return -1;
408 }
409 if(extensibility) cam->port->ieee1284.mode = upload_mode;
410 return 0;
411 }
412
413 /****************************************************************************
414 *
415 * WritePacket
416 *
417 ***************************************************************************/
418 static int WritePacket(struct pp_cam_entry *cam, const u8 *packet, size_t size)
419 {
420 int retval=0;
421 int size_written;
422
423 if (packet == NULL) {
424 return -EINVAL;
425 }
426 if (ForwardSetup(cam)) {
427 DBG("Write failed in setup\n");
428 return -EIO;
429 }
430 size_written = parport_write(cam->port, packet, size);
431 if(size_written != size) {
432 DBG("Write failed, wrote %d/%d\n", size_written, size);
433 retval = -EIO;
434 }
435 EndTransferMode(cam);
436 return retval;
437 }
438
439 /****************************************************************************
440 *
441 * ReadPacket
442 *
443 ***************************************************************************/
444 static int ReadPacket(struct pp_cam_entry *cam, u8 *packet, size_t size)
445 {
446 int retval=0;
447
448 if (packet == NULL) {
449 return -EINVAL;
450 }
451 if (ReverseSetup(cam, 0)) {
452 return -EIO;
453 }
454
455 /* support for CPiA variant nibble reads */
456 if(cam->port->ieee1284.mode == IEEE1284_MODE_NIBBLE) {
457 if(cpia_read_nibble(cam->port, packet, size, 0) != size)
458 retval = -EIO;
459 } else {
460 if(parport_read(cam->port, packet, size) != size)
461 retval = -EIO;
462 }
463 EndTransferMode(cam);
464 return retval;
465 }
466
467 /****************************************************************************
468 *
469 * cpia_pp_streamStart
470 *
471 ***************************************************************************/
472 static int cpia_pp_streamStart(void *privdata)
473 {
474 struct pp_cam_entry *cam = privdata;
475 DBG("\n");
476 cam->streaming=1;
477 cam->image_ready=0;
478 //if (ReverseSetup(cam,1)) return -EIO;
479 if(cam->stream_irq) cpia_parport_enable_irq(cam->port);
480 return 0;
481 }
482
483 /****************************************************************************
484 *
485 * cpia_pp_streamStop
486 *
487 ***************************************************************************/
488 static int cpia_pp_streamStop(void *privdata)
489 {
490 struct pp_cam_entry *cam = privdata;
491
492 DBG("\n");
493 cam->streaming=0;
494 cpia_parport_disable_irq(cam->port);
495 //EndTransferMode(cam);
496
497 return 0;
498 }
499
500 /****************************************************************************
501 *
502 * cpia_pp_streamRead
503 *
504 ***************************************************************************/
505 static int cpia_pp_read(struct parport *port, u8 *buffer, int len)
506 {
507 int bytes_read;
508
509 /* support for CPiA variant "nibble stream" reads */
510 if(port->ieee1284.mode == IEEE1284_MODE_NIBBLE)
511 bytes_read = cpia_read_nibble_stream(port,buffer,len,0);
512 else {
513 int new_bytes;
514 for(bytes_read=0; bytes_read<len; bytes_read += new_bytes) {
515 new_bytes = parport_read(port, buffer+bytes_read,
516 len-bytes_read);
517 if(new_bytes < 0) break;
518 }
519 }
520 return bytes_read;
521 }
522
523 static int cpia_pp_streamRead(void *privdata, u8 *buffer, int noblock)
524 {
525 struct pp_cam_entry *cam = privdata;
526 int read_bytes = 0;
527 int i, endseen, block_size, new_bytes;
528
529 if(cam == NULL) {
530 DBG("Internal driver error: cam is NULL\n");
531 return -EINVAL;
532 }
533 if(buffer == NULL) {
534 DBG("Internal driver error: buffer is NULL\n");
535 return -EINVAL;
536 }
537 //if(cam->streaming) DBG("%d / %d\n", cam->image_ready, noblock);
538 if( cam->stream_irq ) {
539 DBG("%d\n", cam->image_ready);
540 cam->image_ready--;
541 }
542 cam->image_complete=0;
543 if (0/*cam->streaming*/) {
544 if(!cam->image_ready) {
545 if(noblock) return -EWOULDBLOCK;
546 interruptible_sleep_on(&cam->wq_stream);
547 if( signal_pending(current) ) return -EINTR;
548 DBG("%d\n", cam->image_ready);
549 }
550 } else {
551 if (ReverseSetup(cam, 1)) {
552 DBG("unable to ReverseSetup\n");
553 return -EIO;
554 }
555 }
556 endseen = 0;
557 block_size = PARPORT_CHUNK_SIZE;
558 while( !cam->image_complete ) {
559 cond_resched();
560
561 new_bytes = cpia_pp_read(cam->port, buffer, block_size );
562 if( new_bytes <= 0 ) {
563 break;
564 }
565 i=-1;
566 while(++i<new_bytes && endseen<4) {
567 if(*buffer==EOI) {
568 endseen++;
569 } else {
570 endseen=0;
571 }
572 buffer++;
573 }
574 read_bytes += i;
575 if( endseen==4 ) {
576 cam->image_complete=1;
577 break;
578 }
579 if( CPIA_MAX_IMAGE_SIZE-read_bytes <= PARPORT_CHUNK_SIZE ) {
580 block_size=CPIA_MAX_IMAGE_SIZE-read_bytes;
581 }
582 }
583 EndTransferMode(cam);
584 return cam->image_complete ? read_bytes : -EIO;
585 }
586 /****************************************************************************
587 *
588 * cpia_pp_transferCmd
589 *
590 ***************************************************************************/
591 static int cpia_pp_transferCmd(void *privdata, u8 *command, u8 *data)
592 {
593 int err;
594 int retval=0;
595 int databytes;
596 struct pp_cam_entry *cam = privdata;
597
598 if(cam == NULL) {
599 DBG("Internal driver error: cam is NULL\n");
600 return -EINVAL;
601 }
602 if(command == NULL) {
603 DBG("Internal driver error: command is NULL\n");
604 return -EINVAL;
605 }
606 databytes = (((int)command[7])<<8) | command[6];
607 if ((err = WritePacket(cam, command, PACKET_LENGTH)) < 0) {
608 DBG("Error writing command\n");
609 return err;
610 }
611 if(command[0] == DATA_IN) {
612 u8 buffer[8];
613 if(data == NULL) {
614 DBG("Internal driver error: data is NULL\n");
615 return -EINVAL;
616 }
617 if((err = ReadPacket(cam, buffer, 8)) < 0) {
618 DBG("Error reading command result\n");
619 return err;
620 }
621 memcpy(data, buffer, databytes);
622 } else if(command[0] == DATA_OUT) {
623 if(databytes > 0) {
624 if(data == NULL) {
625 DBG("Internal driver error: data is NULL\n");
626 retval = -EINVAL;
627 } else {
628 if((err=WritePacket(cam, data, databytes)) < 0){
629 DBG("Error writing command data\n");
630 return err;
631 }
632 }
633 }
634 } else {
635 DBG("Unexpected first byte of command: %x\n", command[0]);
636 retval = -EINVAL;
637 }
638 return retval;
639 }
640
641 /****************************************************************************
642 *
643 * cpia_pp_open
644 *
645 ***************************************************************************/
646 static int cpia_pp_open(void *privdata)
647 {
648 struct pp_cam_entry *cam = (struct pp_cam_entry *)privdata;
649
650 if (cam == NULL)
651 return -EINVAL;
652
653 if(cam->open_count == 0) {
654 if (parport_claim(cam->pdev)) {
655 DBG("failed to claim the port\n");
656 return -EBUSY;
657 }
658 parport_negotiate(cam->port, IEEE1284_MODE_COMPAT);
659 parport_data_forward(cam->port);
660 parport_write_control(cam->port, PARPORT_CONTROL_SELECT);
661 udelay(50);
662 parport_write_control(cam->port,
663 PARPORT_CONTROL_SELECT
664 | PARPORT_CONTROL_INIT);
665 }
666
667 ++cam->open_count;
668
669 return 0;
670 }
671
672 /****************************************************************************
673 *
674 * cpia_pp_registerCallback
675 *
676 ***************************************************************************/
677 static int cpia_pp_registerCallback(void *privdata, void (*cb)(void *cbdata), void *cbdata)
678 {
679 struct pp_cam_entry *cam = privdata;
680 int retval = 0;
681
682 if(cam->port->irq != PARPORT_IRQ_NONE) {
683 cam->cb_func = cb;
684 cam->cb_data = cbdata;
685 INIT_WORK_NAR(&cam->cb_task, cpia_pp_run_callback);
686 } else {
687 retval = -1;
688 }
689 return retval;
690 }
691
692 /****************************************************************************
693 *
694 * cpia_pp_close
695 *
696 ***************************************************************************/
697 static int cpia_pp_close(void *privdata)
698 {
699 struct pp_cam_entry *cam = privdata;
700 if (--cam->open_count == 0) {
701 parport_release(cam->pdev);
702 }
703 return 0;
704 }
705
706 /****************************************************************************
707 *
708 * cpia_pp_register
709 *
710 ***************************************************************************/
711 static int cpia_pp_register(struct parport *port)
712 {
713 struct pardevice *pdev = NULL;
714 struct pp_cam_entry *cam;
715 struct cam_data *cpia;
716
717 if (!(port->modes & PARPORT_MODE_PCSPP)) {
718 LOG("port is not supported by CPiA driver\n");
719 return -ENXIO;
720 }
721
722 cam = kzalloc(sizeof(struct pp_cam_entry), GFP_KERNEL);
723 if (cam == NULL) {
724 LOG("failed to allocate camera structure\n");
725 return -ENOMEM;
726 }
727
728 pdev = parport_register_device(port, "cpia_pp", NULL, NULL,
729 NULL, 0, cam);
730
731 if (!pdev) {
732 LOG("failed to parport_register_device\n");
733 kfree(cam);
734 return -ENXIO;
735 }
736
737 cam->pdev = pdev;
738 cam->port = port;
739 init_waitqueue_head(&cam->wq_stream);
740
741 cam->streaming = 0;
742 cam->stream_irq = 0;
743
744 if((cpia = cpia_register_camera(&cpia_pp_ops, cam)) == NULL) {
745 LOG("failed to cpia_register_camera\n");
746 parport_unregister_device(pdev);
747 kfree(cam);
748 return -ENXIO;
749 }
750 spin_lock( &cam_list_lock_pp );
751 list_add( &cpia->cam_data_list, &cam_list );
752 spin_unlock( &cam_list_lock_pp );
753
754 return 0;
755 }
756
757 static void cpia_pp_detach (struct parport *port)
758 {
759 struct list_head *tmp;
760 struct cam_data *cpia = NULL;
761 struct pp_cam_entry *cam;
762
763 spin_lock( &cam_list_lock_pp );
764 list_for_each (tmp, &cam_list) {
765 cpia = list_entry(tmp, struct cam_data, cam_data_list);
766 cam = (struct pp_cam_entry *) cpia->lowlevel_data;
767 if (cam && cam->port->number == port->number) {
768 list_del(&cpia->cam_data_list);
769 break;
770 }
771 cpia = NULL;
772 }
773 spin_unlock( &cam_list_lock_pp );
774
775 if (!cpia) {
776 DBG("cpia_pp_detach failed to find cam_data in cam_list\n");
777 return;
778 }
779
780 cam = (struct pp_cam_entry *) cpia->lowlevel_data;
781 cpia_unregister_camera(cpia);
782 if(cam->open_count > 0)
783 cpia_pp_close(cam);
784 parport_unregister_device(cam->pdev);
785 cpia->lowlevel_data = NULL;
786 kfree(cam);
787 }
788
789 static void cpia_pp_attach (struct parport *port)
790 {
791 unsigned int i;
792
793 switch (parport_nr[0])
794 {
795 case PPCPIA_PARPORT_UNSPEC:
796 case PPCPIA_PARPORT_AUTO:
797 if (port->probe_info[0].class != PARPORT_CLASS_MEDIA ||
798 port->probe_info[0].cmdset == NULL ||
799 strncmp(port->probe_info[0].cmdset, "CPIA_1", 6) != 0)
800 return;
801
802 cpia_pp_register(port);
803
804 break;
805
806 default:
807 for (i = 0; i < PARPORT_MAX; ++i) {
808 if (port->number == parport_nr[i]) {
809 cpia_pp_register(port);
810 break;
811 }
812 }
813 break;
814 }
815 }
816
817 static struct parport_driver cpia_pp_driver = {
818 .name = "cpia_pp",
819 .attach = cpia_pp_attach,
820 .detach = cpia_pp_detach,
821 };
822
823 static int cpia_pp_init(void)
824 {
825 printk(KERN_INFO "%s v%d.%d.%d\n",ABOUT,
826 CPIA_PP_MAJ_VER,CPIA_PP_MIN_VER,CPIA_PP_PATCH_VER);
827
828 if(parport_nr[0] == PPCPIA_PARPORT_OFF) {
829 printk(" disabled\n");
830 return 0;
831 }
832
833 spin_lock_init( &cam_list_lock_pp );
834
835 if (parport_register_driver (&cpia_pp_driver)) {
836 LOG ("unable to register with parport\n");
837 return -EIO;
838 }
839 return 0;
840 }
841
842 #ifdef MODULE
843 int init_module(void)
844 {
845 if (parport[0]) {
846 /* The user gave some parameters. Let's see what they were. */
847 if (!strncmp(parport[0], "auto", 4)) {
848 parport_nr[0] = PPCPIA_PARPORT_AUTO;
849 } else {
850 int n;
851 for (n = 0; n < PARPORT_MAX && parport[n]; n++) {
852 if (!strncmp(parport[n], "none", 4)) {
853 parport_nr[n] = PPCPIA_PARPORT_NONE;
854 } else {
855 char *ep;
856 unsigned long r = simple_strtoul(parport[n], &ep, 0);
857 if (ep != parport[n]) {
858 parport_nr[n] = r;
859 } else {
860 LOG("bad port specifier `%s'\n", parport[n]);
861 return -ENODEV;
862 }
863 }
864 }
865 }
866 }
867 return cpia_pp_init();
868 }
869
870 void cleanup_module(void)
871 {
872 parport_unregister_driver (&cpia_pp_driver);
873 return;
874 }
875
876 #else /* !MODULE */
877
878 static int __init cpia_pp_setup(char *str)
879 {
880 int err;
881
882 if (!strncmp(str, "parport", 7)) {
883 int n = simple_strtoul(str + 7, NULL, 10);
884 if (parport_ptr < PARPORT_MAX) {
885 parport_nr[parport_ptr++] = n;
886 } else {
887 LOG("too many ports, %s ignored.\n", str);
888 }
889 } else if (!strcmp(str, "auto")) {
890 parport_nr[0] = PPCPIA_PARPORT_AUTO;
891 } else if (!strcmp(str, "none")) {
892 parport_nr[parport_ptr++] = PPCPIA_PARPORT_NONE;
893 }
894
895 err=cpia_pp_init();
896 if (err)
897 return err;
898
899 return 1;
900 }
901
902 __setup("cpia_pp=", cpia_pp_setup);
903
904 #endif /* !MODULE */
linux kernel for loongson