xref: /openbmc/linux/drivers/media/usb/ttusb-dec/ttusb_dec.c (revision 3e4d8f48b9bfff7585135d096132df9653be9377)

/*
 * 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.
 *
 */

#include <linux/list.h>
#include <linux/module.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 <linux/mutex.h>

#include <media/dmxdev.h>
#include <media/dvb_demux.h>
#include <media/dvb_frontend.h>
#include <media/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)");

DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

#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
};

typedef int (dvb_filter_pes2ts_cb_t) (void *, unsigned char *);

struct dvb_filter_pes2ts {
	unsigned char buf[188];
	unsigned char cc;
	dvb_filter_pes2ts_cb_t *cb;
	void *priv;
};

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;
	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 dvb_filter_pes2ts_init(struct dvb_filter_pes2ts *p2ts,
				   unsigned short pid,
				   dvb_filter_pes2ts_cb_t *cb, void *priv)
{
	unsigned char *buf=p2ts->buf;

	buf[0]=0x47;
	buf[1]=(pid>>8);
	buf[2]=pid&0xff;
	p2ts->cc=0;
	p2ts->cb=cb;
	p2ts->priv=priv;
}

static int dvb_filter_pes2ts(struct dvb_filter_pes2ts *p2ts,
			     unsigned char *pes, int len, int payload_start)
{
	unsigned char *buf=p2ts->buf;
	int ret=0, rest;

	//len=6+((pes[4]<<8)|pes[5]);

	if (payload_start)
		buf[1]|=0x40;
	else
		buf[1]&=~0x40;
	while (len>=184) {
		buf[3]=0x10|((p2ts->cc++)&0x0f);
		memcpy(buf+4, pes, 184);
		if ((ret=p2ts->cb(p2ts->priv, buf)))
			return ret;
		len-=184; pes+=184;
		buf[1]&=~0x40;
	}
	if (!len)
		return 0;
	buf[3]=0x30|((p2ts->cc++)&0x0f);
	rest=183-len;
	if (rest) {
		buf[5]=0x00;
		if (rest-1)
			memset(buf+6, 0xff, rest-1);
	}
	buf[4]=rest;
	memcpy(buf+5+rest, pes, len);
	return p2ts->cb(p2ts->priv, buf);
}

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 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 -ETIME:
			/* this urb is dead, cleanup */
			dprintk("%s:urb shutting down with status: %d\n",
					__func__, urb->status);
			return;
		default:
			dprintk("%s:nonzero status received: %d\n",
					__func__,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 interval 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 received for lets say 200ms.
		 * this should/could be added later ...
		 * for now lets report each signal as a key down and up
		 */
		if (buffer[4] - 1 < ARRAY_SIZE(rc_keys)) {
			dprintk("%s:rc signal:%d\n", __func__, buffer[4]);
			input_report_key(dec->rc_input_dev, rc_keys[buffer[4] - 1], 1);
			input_sync(dec->rc_input_dev);
			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",
			__func__, 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;
	u8 *b;

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

	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", __func__);
		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(KERN_DEBUG "%s: command: %*ph\n",
		       __func__, param_length, b);
	}

	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",
		       __func__, 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",
		       __func__, result);
		mutex_unlock(&dec->usb_mutex);
		kfree(b);
		return result;
	} else {
		if (debug) {
			printk(KERN_DEBUG "%s: result: %*ph\n",
			       __func__, actual_len, b);
		}

		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;
	__be32 tmp;

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

	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 -ENOENT;
	}
}

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, NULL);

	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, NULL);

	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 };

	__be16 pcr = htons(dec->pid[DMX_PES_PCR]);
	__be16 audio = htons(dec->pid[DMX_PES_AUDIO]);
	__be16 video = htons(dec->pid[DMX_PES_VIDEO]);

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

	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", __func__);
		return;
	}

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

	switch (pva[2]) {

	case 0x01: {		/* VideoStream */
		int prebytes = pva[5] & 0x03;
		int postbytes = (pva[5] & 0x0c) >> 2;
		__be16 v_pes_payload_length;

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

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

	default:
		printk("%s: unknown PVA type: %02x.\n", __func__,
		       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, NULL);
}

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

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",
					       __func__,
					       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",
			       __func__);
			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 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", __func__,
				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", __func__);

	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", __func__);

	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", __func__);

	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",
				       __func__, 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", __func__);

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

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

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

	case DMX_PES_OTHER:
		dprintk("  pes_type: DMX_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 };
	__be16 pid;
	u8 c[COMMAND_PACKET_SIZE];
	int c_length;
	int result;
	struct filter_info *finfo;
	unsigned long flags;
	u8 x = 1;

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

	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", __func__);

	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", __func__);

	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", __func__);

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

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

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

	dec->iso_buffer = kcalloc(FRAMES_PER_ISO_BUF * ISO_BUF_COUNT,
			ISO_FRAME_SIZE, GFP_KERNEL);
	if (!dec->iso_buffer)
		return -ENOMEM;

	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;
	int err;

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

	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_MASK(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);

	err = input_register_device(input_dev);
	if (err) {
		input_free_device(input_dev);
		return err;
	}

	dec->rc_input_dev = input_dev;
	if (usb_submit_urb(dec->irq_urb, GFP_KERNEL))
		printk("%s: usb_submit_urb failed\n",__func__);
	/* 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", __func__);

	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)
{
	int result;

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

	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_alloc_coherent(dec->udev,IRQ_PACKET_SIZE,
					GFP_KERNEL, &dec->irq_dma_handle);
		if(!dec->irq_buffer) {
			usb_free_urb(dec->irq_urb);
			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;
	}

	result = ttusb_dec_alloc_iso_urbs(dec);
	if (result) {
		usb_free_urb(dec->irq_urb);
		usb_free_coherent(dec->udev, IRQ_PACKET_SIZE,
				  dec->irq_buffer, dec->irq_dma_handle);
	}
	return result;
}

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];
	const u8 *firmware = NULL;
	size_t firmware_size = 0;
	u16 firmware_csum = 0;
	__be16 firmware_csum_ns;
	__be32 firmware_size_nl;
	u32 crc32_csum, crc32_check;
	__be32 tmp;
	const struct firmware *fw_entry = NULL;

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

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

	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",
			__func__, firmware_size);
		release_firmware(fw_entry);
		return -ENOENT;
	}

	/* 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 = ntohl(tmp);
	if (crc32_csum != crc32_check) {
		printk("%s: crc32 check of DSP code failed (calculated 0x%08x != 0x%08x in file), file invalid.\n",
			__func__, crc32_csum, crc32_check);
		release_firmware(fw_entry);
		return -ENOENT;
	}
	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 = 0, model = 0, version = 0;

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

	result = ttusb_dec_get_stb_state(dec, &mode, &model, &version);
	if (result)
		return 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 {
		/* 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",
			       __func__, model);
			return -ENOENT;
		}
		if (version >= 0x01770000)
			dec->can_playback = 1;
	}
	return 0;
}

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

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

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

	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);
		if (dec->fe->ops.release)
			dec->fe->ops.release(dec->fe);
	}
	dvb_unregister_adapter(&dec->adapter);
}

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

	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", __func__);

	if (enable_rc) {
		/* 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_free_coherent(dec->udev, IRQ_PACKET_SIZE,
				  dec->irq_buffer, dec->irq_dma_handle);
	}

	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 const 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;
	int result;

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

	udev = interface_to_usbdev(intf);

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

	usb_set_intfdata(intf, (void *)dec);

	switch (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;

	result = ttusb_dec_init_usb(dec);
	if (result)
		goto err_usb;
	result = ttusb_dec_init_stb(dec);
	if (result)
		goto err_stb;
	result = ttusb_dec_init_dvb(dec);
	if (result)
		goto err_stb;

	dec->adapter.priv = dec;
	switch (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;
err_stb:
	ttusb_dec_exit_usb(dec);
err_usb:
	kfree(dec);
	return result;
}

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", __func__);

	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 const 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,
};

module_usb_driver(ttusb_dec_driver);

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