aboutsummaryrefslogblamecommitdiffstats
path: root/drivers/media/dvb/ttusb-dec/ttusb_dec.c
blob: 44dea32118483e9dbf14868dd927b84fdfad7ea1 (plain) (tree)
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838





















                                                                       

                        






                              




































































                                                                           
                                                
















                                                     
                                                  







                                                        
                                          


























                                                                   

                                              

















































































                                                                         


                                                                               

































                                                                          
                                                                   
                         
                                                                        























                                                                          
                                              









                                                                          
                                              














                                                             
                                              








































                                                                               
                                     









                                                                         
                                     





































































































































































































































































































































































































































































                                                                                 
                                                      








                                                      
                                      











































                                                                              
                                                      



















                                                                              
                                                              






                                              
                                      












































                                                                     

                                                                            







                                                        

                                                                         












































































































































































































                                                                               
                                                
 
                                    


                                

                                                                     
 









                                                                
 
                                                 
                                                         
 
                                         
 
                                                     
                                                                   

                                                               

                 















                                                       

                                    

























































                                                                                
                                           












                                                                              
                                           













                                                                               

                                           
                              
         




                                                 

                                           
                               
         



























                                                                               
                                   

































                                                                              
                                        























































                                                                                
                                                      







                                            
                                                                          



                                                                
                                                      












                                                                           
                                                      











                                                                                
                                                      



                              
                                                                    













                                                                        
                                              









                                                                     
                                                     




                                                  
                                                                 
 



                                                           
















































                                                                               


                                                                     
 
                                              


                                                                                                     
                                             












                                                          
                                                                     





                                                                        























                                                         
                                















                                                                                               
                                                                    














                                                                             
                      























































































                                                                              
/*
 * TTUSB DEC Driver
 *
 * Copyright (C) 2003-2004 Alex Woods <linux-dvb@giblets.org>
 * IR support by Peter Beutner <p.beutner@gmx.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/mutex.h>

#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/interrupt.h>
#include <linux/firmware.h>
#include <linux/crc32.h>
#include <linux/init.h>
#include <linux/input.h>

#include "dmxdev.h"
#include "dvb_demux.h"
#include "dvb_filter.h"
#include "dvb_frontend.h"
#include "dvb_net.h"
#include "ttusbdecfe.h"

static int debug;
static int output_pva;
static int enable_rc;

module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off debugging (default:off).");
module_param(output_pva, int, 0444);
MODULE_PARM_DESC(output_pva, "Output PVA from dvr device (default:off)");
module_param(enable_rc, int, 0644);
MODULE_PARM_DESC(enable_rc, "Turn on/off IR remote control(default: off)");

#define dprintk	if (debug) printk

#define DRIVER_NAME		"TechnoTrend/Hauppauge DEC USB"

#define COMMAND_PIPE		0x03
#define RESULT_PIPE		0x04
#define IN_PIPE			0x08
#define OUT_PIPE		0x07
#define IRQ_PIPE		0x0A

#define COMMAND_PACKET_SIZE	0x3c
#define ARM_PACKET_SIZE		0x1000
#define IRQ_PACKET_SIZE		0x8

#define ISO_BUF_COUNT		0x04
#define FRAMES_PER_ISO_BUF	0x04
#define ISO_FRAME_SIZE		0x0380

#define	MAX_PVA_LENGTH		6144

enum ttusb_dec_model {
	TTUSB_DEC2000T,
	TTUSB_DEC2540T,
	TTUSB_DEC3000S
};

enum ttusb_dec_packet_type {
	TTUSB_DEC_PACKET_PVA,
	TTUSB_DEC_PACKET_SECTION,
	TTUSB_DEC_PACKET_EMPTY
};

enum ttusb_dec_interface {
	TTUSB_DEC_INTERFACE_INITIAL,
	TTUSB_DEC_INTERFACE_IN,
	TTUSB_DEC_INTERFACE_OUT
};

struct ttusb_dec {
	enum ttusb_dec_model		model;
	char				*model_name;
	char				*firmware_name;
	int				can_playback;

	/* DVB bits */
	struct dvb_adapter		adapter;
	struct dmxdev			dmxdev;
	struct dvb_demux		demux;
	struct dmx_frontend		frontend;
	struct dvb_net			dvb_net;
	struct dvb_frontend*		fe;

	u16			pid[DMX_PES_OTHER];

	/* USB bits */
	struct usb_device		*udev;
	u8				trans_count;
	unsigned int			command_pipe;
	unsigned int			result_pipe;
	unsigned int			in_pipe;
	unsigned int			out_pipe;
	unsigned int			irq_pipe;
	enum ttusb_dec_interface	interface;
	struct mutex			usb_mutex;

	void			*irq_buffer;
	struct urb		*irq_urb;
	dma_addr_t		irq_dma_handle;
	void			*iso_buffer;
	dma_addr_t		iso_dma_handle;
	struct urb		*iso_urb[ISO_BUF_COUNT];
	int			iso_stream_count;
	struct mutex		iso_mutex;

	u8				packet[MAX_PVA_LENGTH + 4];
	enum ttusb_dec_packet_type	packet_type;
	int				packet_state;
	int				packet_length;
	int				packet_payload_length;
	u16				next_packet_id;

	int				pva_stream_count;
	int				filter_stream_count;

	struct dvb_filter_pes2ts	a_pes2ts;
	struct dvb_filter_pes2ts	v_pes2ts;

	u8			v_pes[16 + MAX_PVA_LENGTH];
	int			v_pes_length;
	int			v_pes_postbytes;

	struct list_head	urb_frame_list;
	struct tasklet_struct	urb_tasklet;
	spinlock_t		urb_frame_list_lock;

	struct dvb_demux_filter	*audio_filter;
	struct dvb_demux_filter	*video_filter;
	struct list_head	filter_info_list;
	spinlock_t		filter_info_list_lock;

	struct input_dev	*rc_input_dev;
	char			rc_phys[64];

	int			active; /* Loaded successfully */
};

struct urb_frame {
	u8			data[ISO_FRAME_SIZE];
	int			length;
	struct list_head	urb_frame_list;
};

struct filter_info {
	u8			stream_id;
	struct dvb_demux_filter	*filter;
	struct list_head	filter_info_list;
};

static u16 rc_keys[] = {
	KEY_POWER,
	KEY_MUTE,
	KEY_1,
	KEY_2,
	KEY_3,
	KEY_4,
	KEY_5,
	KEY_6,
	KEY_7,
	KEY_8,
	KEY_9,
	KEY_0,
	KEY_CHANNELUP,
	KEY_VOLUMEDOWN,
	KEY_OK,
	KEY_VOLUMEUP,
	KEY_CHANNELDOWN,
	KEY_PREVIOUS,
	KEY_ESC,
	KEY_RED,
	KEY_GREEN,
	KEY_YELLOW,
	KEY_BLUE,
	KEY_OPTION,
	KEY_M,
	KEY_RADIO
};

static void ttusb_dec_set_model(struct ttusb_dec *dec,
				enum ttusb_dec_model model);

static void ttusb_dec_handle_irq( struct urb *urb, struct pt_regs *regs)
{
	struct ttusb_dec * dec = urb->context;
	char *buffer = dec->irq_buffer;
	int retval;

	switch(urb->status) {
		case 0: /*success*/
			break;
		case -ECONNRESET:
		case -ENOENT:
		case -ESHUTDOWN:
		case -ETIMEDOUT:
			/* this urb is dead, cleanup */
			dprintk("%s:urb shutting down with status: %d\n",
					__FUNCTION__, urb->status);
			return;
		default:
			dprintk("%s:nonzero status received: %d\n",
					__FUNCTION__,urb->status);
			goto exit;
	}

	if( (buffer[0] == 0x1) && (buffer[2] == 0x15) )  {
		/* IR - Event */
		/* this is an fact a bit too simple implementation;
		 * the box also reports a keyrepeat signal
		 * (with buffer[3] == 0x40) in an intervall of ~100ms.
		 * But to handle this correctly we had to imlemenent some
		 * kind of timer which signals a 'key up' event if no
		 * keyrepeat signal is recieved for lets say 200ms.
		 * this should/could be added later ...
		 * for now lets report each signal as a key down and up*/
		dprintk("%s:rc signal:%d\n", __FUNCTION__, buffer[4]);
		input_report_key(dec->rc_input_dev, rc_keys[buffer[4] - 1], 1);
		input_report_key(dec->rc_input_dev, rc_keys[buffer[4] - 1], 0);
		input_sync(dec->rc_input_dev);
	}

exit:	retval = usb_submit_urb(urb, GFP_ATOMIC);
	if(retval)
		printk("%s - usb_commit_urb failed with result: %d\n",
			__FUNCTION__, retval);
}

static u16 crc16(u16 crc, const u8 *buf, size_t len)
{
	u16 tmp;

	while (len--) {
		crc ^= *buf++;
		crc ^= (u8)crc >> 4;
		tmp = (u8)crc;
		crc ^= (tmp ^ (tmp << 1)) << 4;
	}
	return crc;
}

static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command,
				  int param_length, const u8 params[],
				  int *result_length, u8 cmd_result[])
{
	int result, actual_len, i;
	u8 *b;

	dprintk("%s\n", __FUNCTION__);

	b = kmalloc(COMMAND_PACKET_SIZE + 4, GFP_KERNEL);
	if (!b)
		return -ENOMEM;

	if ((result = mutex_lock_interruptible(&dec->usb_mutex))) {
		kfree(b);
		printk("%s: Failed to lock usb mutex.\n", __FUNCTION__);
		return result;
	}

	b[0] = 0xaa;
	b[1] = ++dec->trans_count;
	b[2] = command;
	b[3] = param_length;

	if (params)
		memcpy(&b[4], params, param_length);

	if (debug) {
		printk("%s: command: ", __FUNCTION__);
		for (i = 0; i < param_length + 4; i++)
			printk("0x%02X ", b[i]);
		printk("\n");
	}

	result = usb_bulk_msg(dec->udev, dec->command_pipe, b,
			      COMMAND_PACKET_SIZE + 4, &actual_len, 1000);

	if (result) {
		printk("%s: command bulk message failed: error %d\n",
		       __FUNCTION__, result);
		mutex_unlock(&dec->usb_mutex);
		kfree(b);
		return result;
	}

	result = usb_bulk_msg(dec->udev, dec->result_pipe, b,
			      COMMAND_PACKET_SIZE + 4, &actual_len, 1000);

	if (result) {
		printk("%s: result bulk message failed: error %d\n",
		       __FUNCTION__, result);
		mutex_unlock(&dec->usb_mutex);
		kfree(b);
		return result;
	} else {
		if (debug) {
			printk("%s: result: ", __FUNCTION__);
			for (i = 0; i < actual_len; i++)
				printk("0x%02X ", b[i]);
			printk("\n");
		}

		if (result_length)
			*result_length = b[3];
		if (cmd_result && b[3] > 0)
			memcpy(cmd_result, &b[4], b[3]);

		mutex_unlock(&dec->usb_mutex);

		kfree(b);
		return 0;
	}
}

static int ttusb_dec_get_stb_state (struct ttusb_dec *dec, unsigned int *mode,
				    unsigned int *model, unsigned int *version)
{
	u8 c[COMMAND_PACKET_SIZE];
	int c_length;
	int result;
	unsigned int tmp;

	dprintk("%s\n", __FUNCTION__);

	result = ttusb_dec_send_command(dec, 0x08, 0, NULL, &c_length, c);
	if (result)
		return result;

	if (c_length >= 0x0c) {
		if (mode != NULL) {
			memcpy(&tmp, c, 4);
			*mode = ntohl(tmp);
		}
		if (model != NULL) {
			memcpy(&tmp, &c[4], 4);
			*model = ntohl(tmp);
		}
		if (version != NULL) {
			memcpy(&tmp, &c[8], 4);
			*version = ntohl(tmp);
		}
		return 0;
	} else {
		return -1;
	}
}

static int ttusb_dec_audio_pes2ts_cb(void *priv, unsigned char *data)
{
	struct ttusb_dec *dec = priv;

	dec->audio_filter->feed->cb.ts(data, 188, NULL, 0,
				       &dec->audio_filter->feed->feed.ts,
				       DMX_OK);

	return 0;
}

static int ttusb_dec_video_pes2ts_cb(void *priv, unsigned char *data)
{
	struct ttusb_dec *dec = priv;

	dec->video_filter->feed->cb.ts(data, 188, NULL, 0,
				       &dec->video_filter->feed->feed.ts,
				       DMX_OK);

	return 0;
}

static void ttusb_dec_set_pids(struct ttusb_dec *dec)
{
	u8 b[] = { 0x00, 0x00, 0x00, 0x00,
		   0x00, 0x00, 0xff, 0xff,
		   0xff, 0xff, 0xff, 0xff };

	u16 pcr = htons(dec->pid[DMX_PES_PCR]);
	u16 audio = htons(dec->pid[DMX_PES_AUDIO]);
	u16 video = htons(dec->pid[DMX_PES_VIDEO]);

	dprintk("%s\n", __FUNCTION__);

	memcpy(&b[0], &pcr, 2);
	memcpy(&b[2], &audio, 2);
	memcpy(&b[4], &video, 2);

	ttusb_dec_send_command(dec, 0x50, sizeof(b), b, NULL, NULL);

	dvb_filter_pes2ts_init(&dec->a_pes2ts, dec->pid[DMX_PES_AUDIO],
			       ttusb_dec_audio_pes2ts_cb, dec);
	dvb_filter_pes2ts_init(&dec->v_pes2ts, dec->pid[DMX_PES_VIDEO],
			       ttusb_dec_video_pes2ts_cb, dec);
	dec->v_pes_length = 0;
	dec->v_pes_postbytes = 0;
}

static void ttusb_dec_process_pva(struct ttusb_dec *dec, u8 *pva, int length)
{
	if (length < 8) {
		printk("%s: packet too short - discarding\n", __FUNCTION__);
		return;
	}

	if (length > 8 + MAX_PVA_LENGTH) {
		printk("%s: packet too long - discarding\n", __FUNCTION__);
		return;
	}

	switch (pva[2]) {

	case 0x01: {		/* VideoStream */
		int prebytes = pva[5] & 0x03;
		int postbytes = (pva[5] & 0x0c) >> 2;
		u16 v_pes_payload_length;

		if (output_pva) {
			dec->video_filter->feed->cb.ts(pva, length, NULL, 0,
				&dec->video_filter->feed->feed.ts, DMX_OK);
			return;
		}

		if (dec->v_pes_postbytes > 0 &&
		    dec->v_pes_postbytes == prebytes) {
			memcpy(&dec->v_pes[dec->v_pes_length],
			       &pva[12], prebytes);

			dvb_filter_pes2ts(&dec->v_pes2ts, dec->v_pes,
					  dec->v_pes_length + prebytes, 1);
		}

		if (pva[5] & 0x10) {
			dec->v_pes[7] = 0x80;
			dec->v_pes[8] = 0x05;

			dec->v_pes[9] = 0x21 | ((pva[8] & 0xc0) >> 5);
			dec->v_pes[10] = ((pva[8] & 0x3f) << 2) |
					 ((pva[9] & 0xc0) >> 6);
			dec->v_pes[11] = 0x01 |
					 ((pva[9] & 0x3f) << 2) |
					 ((pva[10] & 0x80) >> 6);
			dec->v_pes[12] = ((pva[10] & 0x7f) << 1) |
					 ((pva[11] & 0xc0) >> 7);
			dec->v_pes[13] = 0x01 | ((pva[11] & 0x7f) << 1);

			memcpy(&dec->v_pes[14], &pva[12 + prebytes],
			       length - 12 - prebytes);
			dec->v_pes_length = 14 + length - 12 - prebytes;
		} else {
			dec->v_pes[7] = 0x00;
			dec->v_pes[8] = 0x00;

			memcpy(&dec->v_pes[9], &pva[8], length - 8);
			dec->v_pes_length = 9 + length - 8;
		}

		dec->v_pes_postbytes = postbytes;

		if (dec->v_pes[9 + dec->v_pes[8]] == 0x00 &&
		    dec->v_pes[10 + dec->v_pes[8]] == 0x00 &&
		    dec->v_pes[11 + dec->v_pes[8]] == 0x01)
			dec->v_pes[6] = 0x84;
		else
			dec->v_pes[6] = 0x80;

		v_pes_payload_length = htons(dec->v_pes_length - 6 +
					     postbytes);
		memcpy(&dec->v_pes[4], &v_pes_payload_length, 2);

		if (postbytes == 0)
			dvb_filter_pes2ts(&dec->v_pes2ts, dec->v_pes,
					  dec->v_pes_length, 1);

		break;
	}

	case 0x02:		/* MainAudioStream */
		if (output_pva) {
			dec->audio_filter->feed->cb.ts(pva, length, NULL, 0,
				&dec->audio_filter->feed->feed.ts, DMX_OK);
			return;
		}

		dvb_filter_pes2ts(&dec->a_pes2ts, &pva[8], length - 8,
				  pva[5] & 0x10);
		break;

	default:
		printk("%s: unknown PVA type: %02x.\n", __FUNCTION__,
		       pva[2]);
		break;
	}
}

static void ttusb_dec_process_filter(struct ttusb_dec *dec, u8 *packet,
				     int length)
{
	struct list_head *item;
	struct filter_info *finfo;
	struct dvb_demux_filter *filter = NULL;
	unsigned long flags;
	u8 sid;

	sid = packet[1];
	spin_lock_irqsave(&dec->filter_info_list_lock, flags);
	for (item = dec->filter_info_list.next; item != &dec->filter_info_list;
	     item = item->next) {
		finfo = list_entry(item, struct filter_info, filter_info_list);
		if (finfo->stream_id == sid) {
			filter = finfo->filter;
			break;
		}
	}
	spin_unlock_irqrestore(&dec->filter_info_list_lock, flags);

	if (filter)
		filter->feed->cb.sec(&packet[2], length - 2, NULL, 0,
				     &filter->filter, DMX_OK);
}

static void ttusb_dec_process_packet(struct ttusb_dec *dec)
{
	int i;
	u16 csum = 0;
	u16 packet_id;

	if (dec->packet_length % 2) {
		printk("%s: odd sized packet - discarding\n", __FUNCTION__);
		return;
	}

	for (i = 0; i < dec->packet_length; i += 2)
		csum ^= ((dec->packet[i] << 8) + dec->packet[i + 1]);

	if (csum) {
		printk("%s: checksum failed - discarding\n", __FUNCTION__);
		return;
	}

	packet_id = dec->packet[dec->packet_length - 4] << 8;
	packet_id += dec->packet[dec->packet_length - 3];

	if ((packet_id != dec->next_packet_id) && dec->next_packet_id) {
		printk("%s: warning: lost packets between %u and %u\n",
		       __FUNCTION__, dec->next_packet_id - 1, packet_id);
	}

	if (packet_id == 0xffff)
		dec->next_packet_id = 0x8000;
	else
		dec->next_packet_id = packet_id + 1;

	switch (dec->packet_type) {
	case TTUSB_DEC_PACKET_PVA:
		if (dec->pva_stream_count)
			ttusb_dec_process_pva(dec, dec->packet,
					      dec->packet_payload_length);
		break;

	case TTUSB_DEC_PACKET_SECTION:
		if (dec->filter_stream_count)
			ttusb_dec_process_filter(dec, dec->packet,
						 dec->packet_payload_length);
		break;

	case TTUSB_DEC_PACKET_EMPTY:
		break;
	}
}

static void swap_bytes(u8 *b, int length)
{
	u8 c;

	length -= length % 2;
	for (; length; b += 2, length -= 2) {
		c = *b;
		*b = *(b + 1);
		*(b + 1) = c;
	}
}

static void ttusb_dec_process_urb_frame(struct ttusb_dec *dec, u8 *b,
					int length)
{
	swap_bytes(b, length);

	while (length) {
		switch (dec->packet_state) {

		case 0:
		case 1:
		case 2:
			if (*b++ == 0xaa)
				dec->packet_state++;
			else
				dec->packet_state = 0;

			length--;
			break;

		case 3:
			if (*b == 0x00) {
				dec->packet_state++;
				dec->packet_length = 0;
			} else if (*b != 0xaa) {
				dec->packet_state = 0;
			}

			b++;
			length--;
			break;

		case 4:
			dec->packet[dec->packet_length++] = *b++;

			if (dec->packet_length == 2) {
				if (dec->packet[0] == 'A' &&
				    dec->packet[1] == 'V') {
					dec->packet_type =
						TTUSB_DEC_PACKET_PVA;
					dec->packet_state++;
				} else if (dec->packet[0] == 'S') {
					dec->packet_type =
						TTUSB_DEC_PACKET_SECTION;
					dec->packet_state++;
				} else if (dec->packet[0] == 0x00) {
					dec->packet_type =
						TTUSB_DEC_PACKET_EMPTY;
					dec->packet_payload_length = 2;
					dec->packet_state = 7;
				} else {
					printk("%s: unknown packet type: "
					       "%02x%02x\n", __FUNCTION__,
					       dec->packet[0], dec->packet[1]);
					dec->packet_state = 0;
				}
			}

			length--;
			break;

		case 5:
			dec->packet[dec->packet_length++] = *b++;

			if (dec->packet_type == TTUSB_DEC_PACKET_PVA &&
			    dec->packet_length == 8) {
				dec->packet_state++;
				dec->packet_payload_length = 8 +
					(dec->packet[6] << 8) +
					dec->packet[7];
			} else if (dec->packet_type ==
					TTUSB_DEC_PACKET_SECTION &&
				   dec->packet_length == 5) {
				dec->packet_state++;
				dec->packet_payload_length = 5 +
					((dec->packet[3] & 0x0f) << 8) +
					dec->packet[4];
			}

			length--;
			break;

		case 6: {
			int remainder = dec->packet_payload_length -
					dec->packet_length;

			if (length >= remainder) {
				memcpy(dec->packet + dec->packet_length,
				       b, remainder);
				dec->packet_length += remainder;
				b += remainder;
				length -= remainder;
				dec->packet_state++;
			} else {
				memcpy(&dec->packet[dec->packet_length],
				       b, length);
				dec->packet_length += length;
				length = 0;
			}

			break;
		}

		case 7: {
			int tail = 4;

			dec->packet[dec->packet_length++] = *b++;

			if (dec->packet_type == TTUSB_DEC_PACKET_SECTION &&
			    dec->packet_payload_length % 2)
				tail++;

			if (dec->packet_length ==
			    dec->packet_payload_length + tail) {
				ttusb_dec_process_packet(dec);
				dec->packet_state = 0;
			}

			length--;
			break;
		}

		default:
			printk("%s: illegal packet state encountered.\n",
			       __FUNCTION__);
			dec->packet_state = 0;
		}
	}
}

static void ttusb_dec_process_urb_frame_list(unsigned long data)
{
	struct ttusb_dec *dec = (struct ttusb_dec *)data;
	struct list_head *item;
	struct urb_frame *frame;
	unsigned long flags;

	while (1) {
		spin_lock_irqsave(&dec->urb_frame_list_lock, flags);
		if ((item = dec->urb_frame_list.next) != &dec->urb_frame_list) {
			frame = list_entry(item, struct urb_frame,
					   urb_frame_list);
			list_del(&frame->urb_frame_list);
		} else {
			spin_unlock_irqrestore(&dec->urb_frame_list_lock,
					       flags);
			return;
		}
		spin_unlock_irqrestore(&dec->urb_frame_list_lock, flags);

		ttusb_dec_process_urb_frame(dec, frame->data, frame->length);
		kfree(frame);
	}
}

static void ttusb_dec_process_urb(struct urb *urb, struct pt_regs *ptregs)
{
	struct ttusb_dec *dec = urb->context;

	if (!urb->status) {
		int i;

		for (i = 0; i < FRAMES_PER_ISO_BUF; i++) {
			struct usb_iso_packet_descriptor *d;
			u8 *b;
			int length;
			struct urb_frame *frame;

			d = &urb->iso_frame_desc[i];
			b = urb->transfer_buffer + d->offset;
			length = d->actual_length;

			if ((frame = kmalloc(sizeof(struct urb_frame),
					     GFP_ATOMIC))) {
				unsigned long flags;

				memcpy(frame->data, b, length);
				frame->length = length;

				spin_lock_irqsave(&dec->urb_frame_list_lock,
						     flags);
				list_add_tail(&frame->urb_frame_list,
					      &dec->urb_frame_list);
				spin_unlock_irqrestore(&dec->urb_frame_list_lock,
						       flags);

				tasklet_schedule(&dec->urb_tasklet);
			}
		}
	} else {
		 /* -ENOENT is expected when unlinking urbs */
		if (urb->status != -ENOENT)
			dprintk("%s: urb error: %d\n", __FUNCTION__,
				urb->status);
	}

	if (dec->iso_stream_count)
		usb_submit_urb(urb, GFP_ATOMIC);
}

static void ttusb_dec_setup_urbs(struct ttusb_dec *dec)
{
	int i, j, buffer_offset = 0;

	dprintk("%s\n", __FUNCTION__);

	for (i = 0; i < ISO_BUF_COUNT; i++) {
		int frame_offset = 0;
		struct urb *urb = dec->iso_urb[i];

		urb->dev = dec->udev;
		urb->context = dec;
		urb->complete = ttusb_dec_process_urb;
		urb->pipe = dec->in_pipe;
		urb->transfer_flags = URB_ISO_ASAP;
		urb->interval = 1;
		urb->number_of_packets = FRAMES_PER_ISO_BUF;
		urb->transfer_buffer_length = ISO_FRAME_SIZE *
					      FRAMES_PER_ISO_BUF;
		urb->transfer_buffer = dec->iso_buffer + buffer_offset;
		buffer_offset += ISO_FRAME_SIZE * FRAMES_PER_ISO_BUF;

		for (j = 0; j < FRAMES_PER_ISO_BUF; j++) {
			urb->iso_frame_desc[j].offset = frame_offset;
			urb->iso_frame_desc[j].length = ISO_FRAME_SIZE;
			frame_offset += ISO_FRAME_SIZE;
		}
	}
}

static void ttusb_dec_stop_iso_xfer(struct ttusb_dec *dec)
{
	int i;

	dprintk("%s\n", __FUNCTION__);

	if (mutex_lock_interruptible(&dec->iso_mutex))
		return;

	dec->iso_stream_count--;

	if (!dec->iso_stream_count) {
		for (i = 0; i < ISO_BUF_COUNT; i++)
			usb_kill_urb(dec->iso_urb[i]);
	}

	mutex_unlock(&dec->iso_mutex);
}

/* Setting the interface of the DEC tends to take down the USB communications
 * for a short period, so it's important not to call this function just before
 * trying to talk to it.
 */
static int ttusb_dec_set_interface(struct ttusb_dec *dec,
				   enum ttusb_dec_interface interface)
{
	int result = 0;
	u8 b[] = { 0x05 };

	if (interface != dec->interface) {
		switch (interface) {
		case TTUSB_DEC_INTERFACE_INITIAL:
			result = usb_set_interface(dec->udev, 0, 0);
			break;
		case TTUSB_DEC_INTERFACE_IN:
			result = ttusb_dec_send_command(dec, 0x80, sizeof(b),
							b, NULL, NULL);
			if (result)
				return result;
			result = usb_set_interface(dec->udev, 0, 8);
			break;
		case TTUSB_DEC_INTERFACE_OUT:
			result = usb_set_interface(dec->udev, 0, 1);
			break;
		}

		if (result)
			return result;

		dec->interface = interface;
	}

	return 0;
}

static int ttusb_dec_start_iso_xfer(struct ttusb_dec *dec)
{
	int i, result;

	dprintk("%s\n", __FUNCTION__);

	if (mutex_lock_interruptible(&dec->iso_mutex))
		return -EAGAIN;

	if (!dec->iso_stream_count) {
		ttusb_dec_setup_urbs(dec);

		dec->packet_state = 0;
		dec->v_pes_postbytes = 0;
		dec->next_packet_id = 0;

		for (i = 0; i < ISO_BUF_COUNT; i++) {
			if ((result = usb_submit_urb(dec->iso_urb[i],
						     GFP_ATOMIC))) {
				printk("%s: failed urb submission %d: "
				       "error %d\n", __FUNCTION__, i, result);

				while (i) {
					usb_kill_urb(dec->iso_urb[i - 1]);
					i--;
				}

				mutex_unlock(&dec->iso_mutex);
				return result;
			}
		}
	}

	dec->iso_stream_count++;

	mutex_unlock(&dec->iso_mutex);

	return 0;
}

static int ttusb_dec_start_ts_feed(struct dvb_demux_feed *dvbdmxfeed)
{
	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
	struct ttusb_dec *dec = dvbdmx->priv;
	u8 b0[] = { 0x05 };
	int result = 0;

	dprintk("%s\n", __FUNCTION__);

	dprintk("  ts_type:");

	if (dvbdmxfeed->ts_type & TS_DECODER)
		dprintk(" TS_DECODER");

	if (dvbdmxfeed->ts_type & TS_PACKET)
		dprintk(" TS_PACKET");

	if (dvbdmxfeed->ts_type & TS_PAYLOAD_ONLY)
		dprintk(" TS_PAYLOAD_ONLY");

	dprintk("\n");

	switch (dvbdmxfeed->pes_type) {

	case DMX_TS_PES_VIDEO:
		dprintk("  pes_type: DMX_TS_PES_VIDEO\n");
		dec->pid[DMX_PES_PCR] = dvbdmxfeed->pid;
		dec->pid[DMX_PES_VIDEO] = dvbdmxfeed->pid;
		dec->video_filter = dvbdmxfeed->filter;
		ttusb_dec_set_pids(dec);
		break;

	case DMX_TS_PES_AUDIO:
		dprintk("  pes_type: DMX_TS_PES_AUDIO\n");
		dec->pid[DMX_PES_AUDIO] = dvbdmxfeed->pid;
		dec->audio_filter = dvbdmxfeed->filter;
		ttusb_dec_set_pids(dec);
		break;

	case DMX_TS_PES_TELETEXT:
		dec->pid[DMX_PES_TELETEXT] = dvbdmxfeed->pid;
		dprintk("  pes_type: DMX_TS_PES_TELETEXT(not supported)\n");
		return -ENOSYS;

	case DMX_TS_PES_PCR:
		dprintk("  pes_type: DMX_TS_PES_PCR\n");
		dec->pid[DMX_PES_PCR] = dvbdmxfeed->pid;
		ttusb_dec_set_pids(dec);
		break;

	case DMX_TS_PES_OTHER:
		dprintk("  pes_type: DMX_TS_PES_OTHER(not supported)\n");
		return -ENOSYS;

	default:
		dprintk("  pes_type: unknown (%d)\n", dvbdmxfeed->pes_type);
		return -EINVAL;

	}

	result = ttusb_dec_send_command(dec, 0x80, sizeof(b0), b0, NULL, NULL);
	if (result)
		return result;

	dec->pva_stream_count++;
	return ttusb_dec_start_iso_xfer(dec);
}

static int ttusb_dec_start_sec_feed(struct dvb_demux_feed *dvbdmxfeed)
{
	struct ttusb_dec *dec = dvbdmxfeed->demux->priv;
	u8 b0[] = { 0x00, 0x00, 0x00, 0x01,
		    0x00, 0x00, 0x00, 0x00,
		    0x00, 0x00, 0x00, 0x00,
		    0x00, 0x00, 0x00, 0x00,
		    0x00, 0xff, 0x00, 0x00,
		    0x00, 0x00, 0x00, 0x00,
		    0x00, 0x00, 0x00, 0x00,
		    0x00 };
	u16 pid;
	u8 c[COMMAND_PACKET_SIZE];
	int c_length;
	int result;
	struct filter_info *finfo;
	unsigned long flags;
	u8 x = 1;

	dprintk("%s\n", __FUNCTION__);

	pid = htons(dvbdmxfeed->pid);
	memcpy(&b0[0], &pid, 2);
	memcpy(&b0[4], &x, 1);
	memcpy(&b0[5], &dvbdmxfeed->filter->filter.filter_value[0], 1);

	result = ttusb_dec_send_command(dec, 0x60, sizeof(b0), b0,
					&c_length, c);

	if (!result) {
		if (c_length == 2) {
			if (!(finfo = kmalloc(sizeof(struct filter_info),
					      GFP_ATOMIC)))
				return -ENOMEM;

			finfo->stream_id = c[1];
			finfo->filter = dvbdmxfeed->filter;

			spin_lock_irqsave(&dec->filter_info_list_lock, flags);
			list_add_tail(&finfo->filter_info_list,
				      &dec->filter_info_list);
			spin_unlock_irqrestore(&dec->filter_info_list_lock,
					       flags);

			dvbdmxfeed->priv = finfo;

			dec->filter_stream_count++;
			return ttusb_dec_start_iso_xfer(dec);
		}

		return -EAGAIN;
	} else
		return result;
}

static int ttusb_dec_start_feed(struct dvb_demux_feed *dvbdmxfeed)
{
	struct dvb_demux *dvbdmx = dvbdmxfeed->demux;

	dprintk("%s\n", __FUNCTION__);

	if (!dvbdmx->dmx.frontend)
		return -EINVAL;

	dprintk("  pid: 0x%04X\n", dvbdmxfeed->pid);

	switch (dvbdmxfeed->type) {

	case DMX_TYPE_TS:
		return ttusb_dec_start_ts_feed(dvbdmxfeed);
		break;

	case DMX_TYPE_SEC:
		return ttusb_dec_start_sec_feed(dvbdmxfeed);
		break;

	default:
		dprintk("  type: unknown (%d)\n", dvbdmxfeed->type);
		return -EINVAL;

	}
}

static int ttusb_dec_stop_ts_feed(struct dvb_demux_feed *dvbdmxfeed)
{
	struct ttusb_dec *dec = dvbdmxfeed->demux->priv;
	u8 b0[] = { 0x00 };

	ttusb_dec_send_command(dec, 0x81, sizeof(b0), b0, NULL, NULL);

	dec->pva_stream_count--;

	ttusb_dec_stop_iso_xfer(dec);

	return 0;
}

static int ttusb_dec_stop_sec_feed(struct dvb_demux_feed *dvbdmxfeed)
{
	struct ttusb_dec *dec = dvbdmxfeed->demux->priv;
	u8 b0[] = { 0x00, 0x00 };
	struct filter_info *finfo = (struct filter_info *)dvbdmxfeed->priv;
	unsigned long flags;

	b0[1] = finfo->stream_id;
	spin_lock_irqsave(&dec->filter_info_list_lock, flags);
	list_del(&finfo->filter_info_list);
	spin_unlock_irqrestore(&dec->filter_info_list_lock, flags);
	kfree(finfo);
	ttusb_dec_send_command(dec, 0x62, sizeof(b0), b0, NULL, NULL);

	dec->filter_stream_count--;

	ttusb_dec_stop_iso_xfer(dec);

	return 0;
}

static int ttusb_dec_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
{
	dprintk("%s\n", __FUNCTION__);

	switch (dvbdmxfeed->type) {
	case DMX_TYPE_TS:
		return ttusb_dec_stop_ts_feed(dvbdmxfeed);
		break;

	case DMX_TYPE_SEC:
		return ttusb_dec_stop_sec_feed(dvbdmxfeed);
		break;
	}

	return 0;
}

static void ttusb_dec_free_iso_urbs(struct ttusb_dec *dec)
{
	int i;

	dprintk("%s\n", __FUNCTION__);

	for (i = 0; i < ISO_BUF_COUNT; i++)
		if (dec->iso_urb[i])
			usb_free_urb(dec->iso_urb[i]);

	pci_free_consistent(NULL,
			    ISO_FRAME_SIZE * (FRAMES_PER_ISO_BUF *
					      ISO_BUF_COUNT),
			    dec->iso_buffer, dec->iso_dma_handle);
}

static int ttusb_dec_alloc_iso_urbs(struct ttusb_dec *dec)
{
	int i;

	dprintk("%s\n", __FUNCTION__);

	dec->iso_buffer = pci_alloc_consistent(NULL,
					       ISO_FRAME_SIZE *
					       (FRAMES_PER_ISO_BUF *
						ISO_BUF_COUNT),
					       &dec->iso_dma_handle);

	memset(dec->iso_buffer, 0,
	       ISO_FRAME_SIZE * (FRAMES_PER_ISO_BUF * ISO_BUF_COUNT));

	for (i = 0; i < ISO_BUF_COUNT; i++) {
		struct urb *urb;

		if (!(urb = usb_alloc_urb(FRAMES_PER_ISO_BUF, GFP_ATOMIC))) {
			ttusb_dec_free_iso_urbs(dec);
			return -ENOMEM;
		}

		dec->iso_urb[i] = urb;
	}

	ttusb_dec_setup_urbs(dec);

	return 0;
}

static void ttusb_dec_init_tasklet(struct ttusb_dec *dec)
{
	spin_lock_init(&dec->urb_frame_list_lock);
	INIT_LIST_HEAD(&dec->urb_frame_list);
	tasklet_init(&dec->urb_tasklet, ttusb_dec_process_urb_frame_list,
		     (unsigned long)dec);
}

static int ttusb_init_rc( struct ttusb_dec *dec)
{
	struct input_dev *input_dev;
	u8 b[] = { 0x00, 0x01 };
	int i;

	usb_make_path(dec->udev, dec->rc_phys, sizeof(dec->rc_phys));
	strlcpy(dec->rc_phys, "/input0", sizeof(dec->rc_phys));

	dec->rc_input_dev = input_dev = input_allocate_device();
	if (!input_dev)
		return -ENOMEM;

	input_dev->name = "ttusb_dec remote control";
	input_dev->phys = dec->rc_phys;
	input_dev->evbit[0] = BIT(EV_KEY);
	input_dev->keycodesize = sizeof(u16);
	input_dev->keycodemax = 0x1a;
	input_dev->keycode = rc_keys;

	for (i = 0; i < ARRAY_SIZE(rc_keys); i++)
		  set_bit(rc_keys[i], input_dev->keybit);

	input_register_device(input_dev);

	if (usb_submit_urb(dec->irq_urb, GFP_KERNEL))
		printk("%s: usb_submit_urb failed\n",__FUNCTION__);
	/* enable irq pipe */
	ttusb_dec_send_command(dec,0xb0,sizeof(b),b,NULL,NULL);

	return 0;
}

static void ttusb_dec_init_v_pes(struct ttusb_dec *dec)
{
	dprintk("%s\n", __FUNCTION__);

	dec->v_pes[0] = 0x00;
	dec->v_pes[1] = 0x00;
	dec->v_pes[2] = 0x01;
	dec->v_pes[3] = 0xe0;
}

static int ttusb_dec_init_usb(struct ttusb_dec *dec)
{
	dprintk("%s\n", __FUNCTION__);

	mutex_init(&dec->usb_mutex);
	mutex_init(&dec->iso_mutex);

	dec->command_pipe = usb_sndbulkpipe(dec->udev, COMMAND_PIPE);
	dec->result_pipe = usb_rcvbulkpipe(dec->udev, RESULT_PIPE);
	dec->in_pipe = usb_rcvisocpipe(dec->udev, IN_PIPE);
	dec->out_pipe = usb_sndisocpipe(dec->udev, OUT_PIPE);
	dec->irq_pipe = usb_rcvintpipe(dec->udev, IRQ_PIPE);

	if(enable_rc) {
		dec->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
		if(!dec->irq_urb) {
			return -ENOMEM;
		}
		dec->irq_buffer = usb_buffer_alloc(dec->udev,IRQ_PACKET_SIZE,
					SLAB_ATOMIC, &dec->irq_dma_handle);
		if(!dec->irq_buffer) {
			return -ENOMEM;
		}
		usb_fill_int_urb(dec->irq_urb, dec->udev,dec->irq_pipe,
				 dec->irq_buffer, IRQ_PACKET_SIZE,
				 ttusb_dec_handle_irq, dec, 1);
		dec->irq_urb->transfer_dma = dec->irq_dma_handle;
		dec->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
	}

	return ttusb_dec_alloc_iso_urbs(dec);
}

static int ttusb_dec_boot_dsp(struct ttusb_dec *dec)
{
	int i, j, actual_len, result, size, trans_count;
	u8 b0[] = { 0x00, 0x00, 0x00, 0x00,
		    0x00, 0x00, 0x00, 0x00,
		    0x61, 0x00 };
	u8 b1[] = { 0x61 };
	u8 *b;
	char idstring[21];
	u8 *firmware = NULL;
	size_t firmware_size = 0;
	u16 firmware_csum = 0;
	u16 firmware_csum_ns;
	u32 firmware_size_nl;
	u32 crc32_csum, crc32_check, tmp;
	const struct firmware *fw_entry = NULL;

	dprintk("%s\n", __FUNCTION__);

	if (request_firmware(&fw_entry, dec->firmware_name, &dec->udev->dev)) {
		printk(KERN_ERR "%s: Firmware (%s) unavailable.\n",
		       __FUNCTION__, dec->firmware_name);
		return 1;
	}

	firmware = fw_entry->data;
	firmware_size = fw_entry->size;

	if (firmware_size < 60) {
		printk("%s: firmware size too small for DSP code (%zu < 60).\n",
			__FUNCTION__, firmware_size);
		release_firmware(fw_entry);
		return -1;
	}

	/* a 32 bit checksum over the first 56 bytes of the DSP Code is stored
	   at offset 56 of file, so use it to check if the firmware file is
	   valid. */
	crc32_csum = crc32(~0L, firmware, 56) ^ ~0L;
	memcpy(&tmp, &firmware[56], 4);
	crc32_check = htonl(tmp);
	if (crc32_csum != crc32_check) {
		printk("%s: crc32 check of DSP code failed (calculated "
		       "0x%08x != 0x%08x in file), file invalid.\n",
			__FUNCTION__, crc32_csum, crc32_check);
		release_firmware(fw_entry);
		return -1;
	}
	memcpy(idstring, &firmware[36], 20);
	idstring[20] = '\0';
	printk(KERN_INFO "ttusb_dec: found DSP code \"%s\".\n", idstring);

	firmware_size_nl = htonl(firmware_size);
	memcpy(b0, &firmware_size_nl, 4);
	firmware_csum = crc16(~0, firmware, firmware_size) ^ ~0;
	firmware_csum_ns = htons(firmware_csum);
	memcpy(&b0[6], &firmware_csum_ns, 2);

	result = ttusb_dec_send_command(dec, 0x41, sizeof(b0), b0, NULL, NULL);

	if (result) {
		release_firmware(fw_entry);
		return result;
	}

	trans_count = 0;
	j = 0;

	b = kmalloc(ARM_PACKET_SIZE, GFP_KERNEL);
	if (b == NULL) {
		release_firmware(fw_entry);
		return -ENOMEM;
	}

	for (i = 0; i < firmware_size; i += COMMAND_PACKET_SIZE) {
		size = firmware_size - i;
		if (size > COMMAND_PACKET_SIZE)
			size = COMMAND_PACKET_SIZE;

		b[j + 0] = 0xaa;
		b[j + 1] = trans_count++;
		b[j + 2] = 0xf0;
		b[j + 3] = size;
		memcpy(&b[j + 4], &firmware[i], size);

		j += COMMAND_PACKET_SIZE + 4;

		if (j >= ARM_PACKET_SIZE) {
			result = usb_bulk_msg(dec->udev, dec->command_pipe, b,
					      ARM_PACKET_SIZE, &actual_len,
					      100);
			j = 0;
		} else if (size < COMMAND_PACKET_SIZE) {
			result = usb_bulk_msg(dec->udev, dec->command_pipe, b,
					      j - COMMAND_PACKET_SIZE + size,
					      &actual_len, 100);
		}
	}

	result = ttusb_dec_send_command(dec, 0x43, sizeof(b1), b1, NULL, NULL);

	release_firmware(fw_entry);
	kfree(b);

	return result;
}

static int ttusb_dec_init_stb(struct ttusb_dec *dec)
{
	int result;
	unsigned int mode, model, version;

	dprintk("%s\n", __FUNCTION__);

	result = ttusb_dec_get_stb_state(dec, &mode, &model, &version);

	if (!result) {
		if (!mode) {
			if (version == 0xABCDEFAB)
				printk(KERN_INFO "ttusb_dec: no version "
				       "info in Firmware\n");
			else
				printk(KERN_INFO "ttusb_dec: Firmware "
				       "%x.%02x%c%c\n",
				       version >> 24, (version >> 16) & 0xff,
				       (version >> 8) & 0xff, version & 0xff);

			result = ttusb_dec_boot_dsp(dec);
			if (result)
				return result;
			else
				return 1;
		} else {
			/* We can't trust the USB IDs that some firmwares
			   give the box */
			switch (model) {
			case 0x00070001:
			case 0x00070008:
			case 0x0007000c:
				ttusb_dec_set_model(dec, TTUSB_DEC3000S);
				break;
			case 0x00070009:
			case 0x00070013:
				ttusb_dec_set_model(dec, TTUSB_DEC2000T);
				break;
			case 0x00070011:
				ttusb_dec_set_model(dec, TTUSB_DEC2540T);
				break;
			default:
				printk(KERN_ERR "%s: unknown model returned "
				       "by firmware (%08x) - please report\n",
				       __FUNCTION__, model);
				return -1;
				break;
			}

			if (version >= 0x01770000)
				dec->can_playback = 1;

			return 0;
		}
	}
	else
		return result;
}

static int ttusb_dec_init_dvb(struct ttusb_dec *dec)
{
	int result;

	dprintk("%s\n", __FUNCTION__);

	if ((result = dvb_register_adapter(&dec->adapter,
					   dec->model_name, THIS_MODULE)) < 0) {
		printk("%s: dvb_register_adapter failed: error %d\n",
		       __FUNCTION__, result);

		return result;
	}

	dec->demux.dmx.capabilities = DMX_TS_FILTERING | DMX_SECTION_FILTERING;

	dec->demux.priv = (void *)dec;
	dec->demux.filternum = 31;
	dec->demux.feednum = 31;
	dec->demux.start_feed = ttusb_dec_start_feed;
	dec->demux.stop_feed = ttusb_dec_stop_feed;
	dec->demux.write_to_decoder = NULL;

	if ((result = dvb_dmx_init(&dec->demux)) < 0) {
		printk("%s: dvb_dmx_init failed: error %d\n", __FUNCTION__,
		       result);

		dvb_unregister_adapter(&dec->adapter);

		return result;
	}

	dec->dmxdev.filternum = 32;
	dec->dmxdev.demux = &dec->demux.dmx;
	dec->dmxdev.capabilities = 0;

	if ((result = dvb_dmxdev_init(&dec->dmxdev, &dec->adapter)) < 0) {
		printk("%s: dvb_dmxdev_init failed: error %d\n",
		       __FUNCTION__, result);

		dvb_dmx_release(&dec->demux);
		dvb_unregister_adapter(&dec->adapter);

		return result;
	}

	dec->frontend.source = DMX_FRONTEND_0;

	if ((result = dec->demux.dmx.add_frontend(&dec->demux.dmx,
						  &dec->frontend)) < 0) {
		printk("%s: dvb_dmx_init failed: error %d\n", __FUNCTION__,
		       result);

		dvb_dmxdev_release(&dec->dmxdev);
		dvb_dmx_release(&dec->demux);
		dvb_unregister_adapter(&dec->adapter);

		return result;
	}

	if ((result = dec->demux.dmx.connect_frontend(&dec->demux.dmx,
						      &dec->frontend)) < 0) {
		printk("%s: dvb_dmx_init failed: error %d\n", __FUNCTION__,
		       result);

		dec->demux.dmx.remove_frontend(&dec->demux.dmx, &dec->frontend);
		dvb_dmxdev_release(&dec->dmxdev);
		dvb_dmx_release(&dec->demux);
		dvb_unregister_adapter(&dec->adapter);

		return result;
	}

	dvb_net_init(&dec->adapter, &dec->dvb_net, &dec->demux.dmx);

	return 0;
}

static void ttusb_dec_exit_dvb(struct ttusb_dec *dec)
{
	dprintk("%s\n", __FUNCTION__);

	dvb_net_release(&dec->dvb_net);
	dec->demux.dmx.close(&dec->demux.dmx);
	dec->demux.dmx.remove_frontend(&dec->demux.dmx, &dec->frontend);
	dvb_dmxdev_release(&dec->dmxdev);
	dvb_dmx_release(&dec->demux);
	if (dec->fe) dvb_unregister_frontend(dec->fe);
	dvb_unregister_adapter(&dec->adapter);
}

static void ttusb_dec_exit_rc(struct ttusb_dec *dec)
{

	dprintk("%s\n", __FUNCTION__);
	/* we have to check whether the irq URB is already submitted.
	  * As the irq is submitted after the interface is changed,
	  * this is the best method i figured out.
	  * Any others?*/
	if (dec->interface == TTUSB_DEC_INTERFACE_IN)
		usb_kill_urb(dec->irq_urb);

	usb_free_urb(dec->irq_urb);

	usb_buffer_free(dec->udev,IRQ_PACKET_SIZE,
			   dec->irq_buffer, dec->irq_dma_handle);

	if (dec->rc_input_dev) {
		input_unregister_device(dec->rc_input_dev);
		dec->rc_input_dev = NULL;
	}
}


static void ttusb_dec_exit_usb(struct ttusb_dec *dec)
{
	int i;

	dprintk("%s\n", __FUNCTION__);

	dec->iso_stream_count = 0;

	for (i = 0; i < ISO_BUF_COUNT; i++)
		usb_kill_urb(dec->iso_urb[i]);

	ttusb_dec_free_iso_urbs(dec);
}

static void ttusb_dec_exit_tasklet(struct ttusb_dec *dec)
{
	struct list_head *item;
	struct urb_frame *frame;

	tasklet_kill(&dec->urb_tasklet);

	while ((item = dec->urb_frame_list.next) != &dec->urb_frame_list) {
		frame = list_entry(item, struct urb_frame, urb_frame_list);
		list_del(&frame->urb_frame_list);
		kfree(frame);
	}
}

static void ttusb_dec_init_filters(struct ttusb_dec *dec)
{
	INIT_LIST_HEAD(&dec->filter_info_list);
	spin_lock_init(&dec->filter_info_list_lock);
}

static void ttusb_dec_exit_filters(struct ttusb_dec *dec)
{
	struct list_head *item;
	struct filter_info *finfo;

	while ((item = dec->filter_info_list.next) != &dec->filter_info_list) {
		finfo = list_entry(item, struct filter_info, filter_info_list);
		list_del(&finfo->filter_info_list);
		kfree(finfo);
	}
}

static int fe_send_command(struct dvb_frontend* fe, const u8 command,
			   int param_length, const u8 params[],
			   int *result_length, u8 cmd_result[])
{
	struct ttusb_dec* dec = fe->dvb->priv;
	return ttusb_dec_send_command(dec, command, param_length, params, result_length, cmd_result);
}

static struct ttusbdecfe_config fe_config = {
	.send_command = fe_send_command
};

static int ttusb_dec_probe(struct usb_interface *intf,
			   const struct usb_device_id *id)
{
	struct usb_device *udev;
	struct ttusb_dec *dec;

	dprintk("%s\n", __FUNCTION__);

	udev = interface_to_usbdev(intf);

	if (!(dec = kzalloc(sizeof(struct ttusb_dec), GFP_KERNEL))) {
		printk("%s: couldn't allocate memory.\n", __FUNCTION__);
		return -ENOMEM;
	}

	usb_set_intfdata(intf, (void *)dec);

	switch (le16_to_cpu(id->idProduct)) {
	case 0x1006:
		ttusb_dec_set_model(dec, TTUSB_DEC3000S);
		break;

	case 0x1008:
		ttusb_dec_set_model(dec, TTUSB_DEC2000T);
		break;

	case 0x1009:
		ttusb_dec_set_model(dec, TTUSB_DEC2540T);
		break;
	}

	dec->udev = udev;

	if (ttusb_dec_init_usb(dec))
		return 0;
	if (ttusb_dec_init_stb(dec)) {
		ttusb_dec_exit_usb(dec);
		return 0;
	}
	ttusb_dec_init_dvb(dec);

	dec->adapter.priv = dec;
	switch (le16_to_cpu(id->idProduct)) {
	case 0x1006:
		dec->fe = ttusbdecfe_dvbs_attach(&fe_config);
		break;

	case 0x1008:
	case 0x1009:
		dec->fe = ttusbdecfe_dvbt_attach(&fe_config);
		break;
	}

	if (dec->fe == NULL) {
		printk("dvb-ttusb-dec: A frontend driver was not found for device %04x/%04x\n",
		       le16_to_cpu(dec->udev->descriptor.idVendor),
		       le16_to_cpu(dec->udev->descriptor.idProduct));
	} else {
		if (dvb_register_frontend(&dec->adapter, dec->fe)) {
			printk("budget-ci: Frontend registration failed!\n");
			if (dec->fe->ops->release)
				dec->fe->ops->release(dec->fe);
			dec->fe = NULL;
		}
	}

	ttusb_dec_init_v_pes(dec);
	ttusb_dec_init_filters(dec);
	ttusb_dec_init_tasklet(dec);

	dec->active = 1;

	ttusb_dec_set_interface(dec, TTUSB_DEC_INTERFACE_IN);

	if (enable_rc)
		ttusb_init_rc(dec);

	return 0;
}

static void ttusb_dec_disconnect(struct usb_interface *intf)
{
	struct ttusb_dec *dec = usb_get_intfdata(intf);

	usb_set_intfdata(intf, NULL);

	dprintk("%s\n", __FUNCTION__);

	if (dec->active) {
		ttusb_dec_exit_tasklet(dec);
		ttusb_dec_exit_filters(dec);
		if(enable_rc)
			ttusb_dec_exit_rc(dec);
		ttusb_dec_exit_usb(dec);
		ttusb_dec_exit_dvb(dec);
	}

	kfree(dec);
}

static void ttusb_dec_set_model(struct ttusb_dec *dec,
				enum ttusb_dec_model model)
{
	dec->model = model;

	switch (model) {
	case TTUSB_DEC2000T:
		dec->model_name = "DEC2000-t";
		dec->firmware_name = "dvb-ttusb-dec-2000t.fw";
		break;

	case TTUSB_DEC2540T:
		dec->model_name = "DEC2540-t";
		dec->firmware_name = "dvb-ttusb-dec-2540t.fw";
		break;

	case TTUSB_DEC3000S:
		dec->model_name = "DEC3000-s";
		dec->firmware_name = "dvb-ttusb-dec-3000s.fw";
		break;
	}
}

static struct usb_device_id ttusb_dec_table[] = {
	{USB_DEVICE(0x0b48, 0x1006)},	/* DEC3000-s */
	/*{USB_DEVICE(0x0b48, 0x1007)},	   Unconfirmed */
	{USB_DEVICE(0x0b48, 0x1008)},	/* DEC2000-t */
	{USB_DEVICE(0x0b48, 0x1009)},	/* DEC2540-t */
	{}
};

static struct usb_driver ttusb_dec_driver = {
	.name		= "ttusb-dec",
	.probe		= ttusb_dec_probe,
	.disconnect	= ttusb_dec_disconnect,
	.id_table	= ttusb_dec_table,
};

static int __init ttusb_dec_init(void)
{
	int result;

	if ((result = usb_register(&ttusb_dec_driver)) < 0) {
		printk("%s: initialisation failed: error %d.\n", __FUNCTION__,
		       result);
		return result;
	}

	return 0;
}

static void __exit ttusb_dec_exit(void)
{
	usb_deregister(&ttusb_dec_driver);
}

module_init(ttusb_dec_init);
module_exit(ttusb_dec_exit);

MODULE_AUTHOR("Alex Woods <linux-dvb@giblets.org>");
MODULE_DESCRIPTION(DRIVER_NAME);
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(usb, ttusb_dec_table);