[deliverable/linux.git] / drivers / media / video / cx23885 / cx23885-dvb.c

/*
 *  Driver for the Conexant CX23885 PCIe bridge
 *
 *  Copyright (c) 2006 Steven Toth <stoth@linuxtv.org>
 *
 *  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/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/kthread.h>
#include <linux/file.h>
#include <linux/suspend.h>

#include "cx23885.h"
#include <media/v4l2-common.h>

#include "s5h1409.h"
#include "s5h1411.h"
#include "mt2131.h"
#include "tda8290.h"
#include "tda18271.h"
#include "lgdt330x.h"
#include "xc5000.h"
#include "tda10048.h"
#include "tuner-xc2028.h"
#include "tuner-simple.h"
#include "dib7000p.h"
#include "dibx000_common.h"
#include "zl10353.h"

static unsigned int debug;

#define dprintk(level, fmt, arg...)\
	do { if (debug >= level)\
		printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
	} while (0)

/* ------------------------------------------------------------------ */

static unsigned int alt_tuner;
module_param(alt_tuner, int, 0644);
MODULE_PARM_DESC(alt_tuner, "Enable alternate tuner configuration");

DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);

/* ------------------------------------------------------------------ */

static int dvb_buf_setup(struct videobuf_queue *q,
			 unsigned int *count, unsigned int *size)
{
	struct cx23885_tsport *port = q->priv_data;

	port->ts_packet_size  = 188 * 4;
	port->ts_packet_count = 32;

	*size  = port->ts_packet_size * port->ts_packet_count;
	*count = 32;
	return 0;
}

static int dvb_buf_prepare(struct videobuf_queue *q,
			   struct videobuf_buffer *vb, enum v4l2_field field)
{
	struct cx23885_tsport *port = q->priv_data;
	return cx23885_buf_prepare(q, port, (struct cx23885_buffer *)vb, field);
}

static void dvb_buf_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
	struct cx23885_tsport *port = q->priv_data;
	cx23885_buf_queue(port, (struct cx23885_buffer *)vb);
}

static void dvb_buf_release(struct videobuf_queue *q,
			    struct videobuf_buffer *vb)
{
	cx23885_free_buffer(q, (struct cx23885_buffer *)vb);
}

static struct videobuf_queue_ops dvb_qops = {
	.buf_setup    = dvb_buf_setup,
	.buf_prepare  = dvb_buf_prepare,
	.buf_queue    = dvb_buf_queue,
	.buf_release  = dvb_buf_release,
};

static struct s5h1409_config hauppauge_generic_config = {
	.demod_address = 0x32 >> 1,
	.output_mode   = S5H1409_SERIAL_OUTPUT,
	.gpio          = S5H1409_GPIO_ON,
	.qam_if        = 44000,
	.inversion     = S5H1409_INVERSION_OFF,
	.status_mode   = S5H1409_DEMODLOCKING,
	.mpeg_timing   = S5H1409_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
};

static struct tda10048_config hauppauge_hvr1200_config = {
	.demod_address    = 0x10 >> 1,
	.output_mode      = TDA10048_SERIAL_OUTPUT,
	.fwbulkwritelen   = TDA10048_BULKWRITE_200,
	.inversion        = TDA10048_INVERSION_ON
};

static struct s5h1409_config hauppauge_ezqam_config = {
	.demod_address = 0x32 >> 1,
	.output_mode   = S5H1409_SERIAL_OUTPUT,
	.gpio          = S5H1409_GPIO_OFF,
	.qam_if        = 4000,
	.inversion     = S5H1409_INVERSION_ON,
	.status_mode   = S5H1409_DEMODLOCKING,
	.mpeg_timing   = S5H1409_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
};

static struct s5h1409_config hauppauge_hvr1800lp_config = {
	.demod_address = 0x32 >> 1,
	.output_mode   = S5H1409_SERIAL_OUTPUT,
	.gpio          = S5H1409_GPIO_OFF,
	.qam_if        = 44000,
	.inversion     = S5H1409_INVERSION_OFF,
	.status_mode   = S5H1409_DEMODLOCKING,
	.mpeg_timing   = S5H1409_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
};

static struct s5h1409_config hauppauge_hvr1500_config = {
	.demod_address = 0x32 >> 1,
	.output_mode   = S5H1409_SERIAL_OUTPUT,
	.gpio          = S5H1409_GPIO_OFF,
	.inversion     = S5H1409_INVERSION_OFF,
	.status_mode   = S5H1409_DEMODLOCKING,
	.mpeg_timing   = S5H1409_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
};

static struct mt2131_config hauppauge_generic_tunerconfig = {
	0x61
};

static struct lgdt330x_config fusionhdtv_5_express = {
	.demod_address = 0x0e,
	.demod_chip = LGDT3303,
	.serial_mpeg = 0x40,
};

static struct s5h1409_config hauppauge_hvr1500q_config = {
	.demod_address = 0x32 >> 1,
	.output_mode   = S5H1409_SERIAL_OUTPUT,
	.gpio          = S5H1409_GPIO_ON,
	.qam_if        = 44000,
	.inversion     = S5H1409_INVERSION_OFF,
	.status_mode   = S5H1409_DEMODLOCKING,
	.mpeg_timing   = S5H1409_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
};

static struct s5h1409_config dvico_s5h1409_config = {
	.demod_address = 0x32 >> 1,
	.output_mode   = S5H1409_SERIAL_OUTPUT,
	.gpio          = S5H1409_GPIO_ON,
	.qam_if        = 44000,
	.inversion     = S5H1409_INVERSION_OFF,
	.status_mode   = S5H1409_DEMODLOCKING,
	.mpeg_timing   = S5H1409_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
};

static struct s5h1411_config dvico_s5h1411_config = {
	.output_mode   = S5H1411_SERIAL_OUTPUT,
	.gpio          = S5H1411_GPIO_ON,
	.qam_if        = S5H1411_IF_44000,
	.vsb_if        = S5H1411_IF_44000,
	.inversion     = S5H1411_INVERSION_OFF,
	.status_mode   = S5H1411_DEMODLOCKING,
	.mpeg_timing   = S5H1411_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
};

static struct xc5000_config hauppauge_hvr1500q_tunerconfig = {
	.i2c_address      = 0x61,
	.if_khz           = 5380,
};

static struct xc5000_config dvico_xc5000_tunerconfig = {
	.i2c_address      = 0x64,
	.if_khz           = 5380,
};

static struct tda829x_config tda829x_no_probe = {
	.probe_tuner = TDA829X_DONT_PROBE,
};

static struct tda18271_std_map hauppauge_tda18271_std_map = {
	.atsc_6   = { .if_freq = 5380, .agc_mode = 3, .std = 3,
		      .if_lvl = 6, .rfagc_top = 0x37 },
	.qam_6    = { .if_freq = 4000, .agc_mode = 3, .std = 0,
		      .if_lvl = 6, .rfagc_top = 0x37 },
};

static struct tda18271_config hauppauge_tda18271_config = {
	.std_map = &hauppauge_tda18271_std_map,
	.gate    = TDA18271_GATE_ANALOG,
};

static struct tda18271_config hauppauge_hvr1200_tuner_config = {
	.gate    = TDA18271_GATE_ANALOG,
};

static struct dibx000_agc_config xc3028_agc_config = {
	BAND_VHF | BAND_UHF,	/* band_caps */

	/* P_agc_use_sd_mod1=0, P_agc_use_sd_mod2=0, P_agc_freq_pwm_div=0,
	 * P_agc_inv_pwm1=0, P_agc_inv_pwm2=0,
	 * P_agc_inh_dc_rv_est=0, P_agc_time_est=3, P_agc_freeze=0,
	 * P_agc_nb_est=2, P_agc_write=0
	 */
	(0 << 15) | (0 << 14) | (0 << 11) | (0 << 10) | (0 << 9) | (0 << 8) |
		(3 << 5) | (0 << 4) | (2 << 1) | (0 << 0), /* setup */

	712,	/* inv_gain */
	21,	/* time_stabiliz */

	0,	/* alpha_level */
	118,	/* thlock */

	0,	/* wbd_inv */
	2867,	/* wbd_ref */
	0,	/* wbd_sel */
	2,	/* wbd_alpha */

	0,	/* agc1_max */
	0,	/* agc1_min */
	39718,	/* agc2_max */
	9930,	/* agc2_min */
	0,	/* agc1_pt1 */
	0,	/* agc1_pt2 */
	0,	/* agc1_pt3 */
	0,	/* agc1_slope1 */
	0,	/* agc1_slope2 */
	0,	/* agc2_pt1 */
	128,	/* agc2_pt2 */
	29,	/* agc2_slope1 */
	29,	/* agc2_slope2 */

	17,	/* alpha_mant */
	27,	/* alpha_exp */
	23,	/* beta_mant */
	51,	/* beta_exp */

	1,	/* perform_agc_softsplit */
};

/* PLL Configuration for COFDM BW_MHz = 8.000000
 * With external clock = 30.000000 */
static struct dibx000_bandwidth_config xc3028_bw_config = {
	60000,	/* internal */
	30000,	/* sampling */
	1,	/* pll_cfg: prediv */
	8,	/* pll_cfg: ratio */
	3,	/* pll_cfg: range */
	1,	/* pll_cfg: reset */
	0,	/* pll_cfg: bypass */
	0,	/* misc: refdiv */
	0,	/* misc: bypclk_div */
	1,	/* misc: IO_CLK_en_core */
	1,	/* misc: ADClkSrc */
	0,	/* misc: modulo */
	(3 << 14) | (1 << 12) | (524 << 0), /* sad_cfg: refsel, sel, freq_15k */
	(1 << 25) | 5816102, /* ifreq = 5.200000 MHz */
	20452225, /* timf */
	30000000  /* xtal_hz */
};

static struct dib7000p_config hauppauge_hvr1400_dib7000_config = {
	.output_mpeg2_in_188_bytes = 1,
	.hostbus_diversity = 1,
	.tuner_is_baseband = 0,
	.update_lna  = NULL,

	.agc_config_count = 1,
	.agc = &xc3028_agc_config,
	.bw  = &xc3028_bw_config,

	.gpio_dir = DIB7000P_GPIO_DEFAULT_DIRECTIONS,
	.gpio_val = DIB7000P_GPIO_DEFAULT_VALUES,
	.gpio_pwm_pos = DIB7000P_GPIO_DEFAULT_PWM_POS,

	.pwm_freq_div = 0,
	.agc_control  = NULL,
	.spur_protect = 0,

	.output_mode = OUTMODE_MPEG2_SERIAL,
};

static struct zl10353_config dvico_fusionhdtv_xc3028 = {
	.demod_address = 0x0f,
	.if2           = 45600,
	.no_tuner      = 1,
};

static int dvb_register(struct cx23885_tsport *port)
{
	struct cx23885_dev *dev = port->dev;
	struct cx23885_i2c *i2c_bus = NULL;
	struct videobuf_dvb_frontend *fe0;

	/* Get the first frontend */
	fe0 = videobuf_dvb_get_frontend(&port->frontends, 1);
	if (!fe0)
		return -EINVAL;

	/* init struct videobuf_dvb */
	fe0->dvb.name = dev->name;

	/* init frontend */
	switch (dev->board) {
	case CX23885_BOARD_HAUPPAUGE_HVR1250:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(s5h1409_attach,
						&hauppauge_generic_config,
						&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			dvb_attach(mt2131_attach, fe0->dvb.frontend,
				   &i2c_bus->i2c_adap,
				   &hauppauge_generic_tunerconfig, 0);
		}
		break;
	case CX23885_BOARD_HAUPPAUGE_HVR1800:
		i2c_bus = &dev->i2c_bus[0];
		switch (alt_tuner) {
		case 1:
			fe0->dvb.frontend =
				dvb_attach(s5h1409_attach,
					   &hauppauge_ezqam_config,
					   &i2c_bus->i2c_adap);
			if (fe0->dvb.frontend != NULL) {
				dvb_attach(tda829x_attach, fe0->dvb.frontend,
					   &dev->i2c_bus[1].i2c_adap, 0x42,
					   &tda829x_no_probe);
				dvb_attach(tda18271_attach, fe0->dvb.frontend,
					   0x60, &dev->i2c_bus[1].i2c_adap,
					   &hauppauge_tda18271_config);
			}
			break;
		case 0:
		default:
			fe0->dvb.frontend =
				dvb_attach(s5h1409_attach,
					   &hauppauge_generic_config,
					   &i2c_bus->i2c_adap);
			if (fe0->dvb.frontend != NULL)
				dvb_attach(mt2131_attach, fe0->dvb.frontend,
					   &i2c_bus->i2c_adap,
					   &hauppauge_generic_tunerconfig, 0);
			break;
		}
		break;
	case CX23885_BOARD_HAUPPAUGE_HVR1800lp:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(s5h1409_attach,
						&hauppauge_hvr1800lp_config,
						&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			dvb_attach(mt2131_attach, fe0->dvb.frontend,
				   &i2c_bus->i2c_adap,
				   &hauppauge_generic_tunerconfig, 0);
		}
		break;
	case CX23885_BOARD_DVICO_FUSIONHDTV_5_EXP:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(lgdt330x_attach,
						&fusionhdtv_5_express,
						&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			dvb_attach(simple_tuner_attach, fe0->dvb.frontend,
				   &i2c_bus->i2c_adap, 0x61,
				   TUNER_LG_TDVS_H06XF);
		}
		break;
	case CX23885_BOARD_HAUPPAUGE_HVR1500Q:
		i2c_bus = &dev->i2c_bus[1];
		fe0->dvb.frontend = dvb_attach(s5h1409_attach,
						&hauppauge_hvr1500q_config,
						&dev->i2c_bus[0].i2c_adap);
		if (fe0->dvb.frontend != NULL)
			dvb_attach(xc5000_attach, fe0->dvb.frontend,
				   &i2c_bus->i2c_adap,
				   &hauppauge_hvr1500q_tunerconfig);
		break;
	case CX23885_BOARD_HAUPPAUGE_HVR1500:
		i2c_bus = &dev->i2c_bus[1];
		fe0->dvb.frontend = dvb_attach(s5h1409_attach,
						&hauppauge_hvr1500_config,
						&dev->i2c_bus[0].i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			struct dvb_frontend *fe;
			struct xc2028_config cfg = {
				.i2c_adap  = &i2c_bus->i2c_adap,
				.i2c_addr  = 0x61,
			};
			static struct xc2028_ctrl ctl = {
				.fname       = XC2028_DEFAULT_FIRMWARE,
				.max_len     = 64,
				.scode_table = XC3028_FE_OREN538,
			};

			fe = dvb_attach(xc2028_attach,
					fe0->dvb.frontend, &cfg);
			if (fe != NULL && fe->ops.tuner_ops.set_config != NULL)
				fe->ops.tuner_ops.set_config(fe, &ctl);
		}
		break;
	case CX23885_BOARD_HAUPPAUGE_HVR1200:
	case CX23885_BOARD_HAUPPAUGE_HVR1700:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(tda10048_attach,
			&hauppauge_hvr1200_config,
			&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			dvb_attach(tda829x_attach, fe0->dvb.frontend,
				&dev->i2c_bus[1].i2c_adap, 0x42,
				&tda829x_no_probe);
			dvb_attach(tda18271_attach, fe0->dvb.frontend,
				0x60, &dev->i2c_bus[1].i2c_adap,
				&hauppauge_hvr1200_tuner_config);
		}
		break;
	case CX23885_BOARD_HAUPPAUGE_HVR1400:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(dib7000p_attach,
			&i2c_bus->i2c_adap,
			0x12, &hauppauge_hvr1400_dib7000_config);
		if (fe0->dvb.frontend != NULL) {
			struct dvb_frontend *fe;
			struct xc2028_config cfg = {
				.i2c_adap  = &dev->i2c_bus[1].i2c_adap,
				.i2c_addr  = 0x64,
			};
			static struct xc2028_ctrl ctl = {
				.fname   = XC3028L_DEFAULT_FIRMWARE,
				.max_len = 64,
				.demod   = 5000,
				/* This is true for all demods with
					v36 firmware? */
				.type    = XC2028_D2633,
			};

			fe = dvb_attach(xc2028_attach,
					fe0->dvb.frontend, &cfg);
			if (fe != NULL && fe->ops.tuner_ops.set_config != NULL)
				fe->ops.tuner_ops.set_config(fe, &ctl);
		}
		break;
	case CX23885_BOARD_DVICO_FUSIONHDTV_7_DUAL_EXP:
		i2c_bus = &dev->i2c_bus[port->nr - 1];

		fe0->dvb.frontend = dvb_attach(s5h1409_attach,
						&dvico_s5h1409_config,
						&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend == NULL)
			fe0->dvb.frontend = dvb_attach(s5h1411_attach,
							&dvico_s5h1411_config,
							&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL)
			dvb_attach(xc5000_attach, fe0->dvb.frontend,
				   &i2c_bus->i2c_adap,
				   &dvico_xc5000_tunerconfig);
		break;
	case CX23885_BOARD_DVICO_FUSIONHDTV_DVB_T_DUAL_EXP: {
		i2c_bus = &dev->i2c_bus[port->nr - 1];

		fe0->dvb.frontend = dvb_attach(zl10353_attach,
					       &dvico_fusionhdtv_xc3028,
					       &i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			struct dvb_frontend      *fe;
			struct xc2028_config	  cfg = {
				.i2c_adap  = &i2c_bus->i2c_adap,
				.i2c_addr  = 0x61,
			};
			static struct xc2028_ctrl ctl = {
				.fname       = XC2028_DEFAULT_FIRMWARE,
				.max_len     = 64,
				.demod       = XC3028_FE_ZARLINK456,
			};

			fe = dvb_attach(xc2028_attach, fe0->dvb.frontend,
					&cfg);
			if (fe != NULL && fe->ops.tuner_ops.set_config != NULL)
				fe->ops.tuner_ops.set_config(fe, &ctl);
		}
		break;
	}
	case CX23885_BOARD_LEADTEK_WINFAST_PXDVR3200_H:
	case CX23885_BOARD_COMPRO_VIDEOMATE_E650F:
		i2c_bus = &dev->i2c_bus[0];

		fe0->dvb.frontend = dvb_attach(zl10353_attach,
			&dvico_fusionhdtv_xc3028,
			&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			struct dvb_frontend      *fe;
			struct xc2028_config	  cfg = {
				.i2c_adap  = &dev->i2c_bus[1].i2c_adap,
				.i2c_addr  = 0x61,
			};
			static struct xc2028_ctrl ctl = {
				.fname       = XC2028_DEFAULT_FIRMWARE,
				.max_len     = 64,
				.demod       = XC3028_FE_ZARLINK456,
			};

			fe = dvb_attach(xc2028_attach, fe0->dvb.frontend,
				&cfg);
			if (fe != NULL && fe->ops.tuner_ops.set_config != NULL)
				fe->ops.tuner_ops.set_config(fe, &ctl);
		}
		break;
	default:
		printk(KERN_INFO "%s: The frontend of your DVB/ATSC card "
			" isn't supported yet\n",
		       dev->name);
		break;
	}
	if (NULL == fe0->dvb.frontend) {
		printk(KERN_ERR "%s: frontend initialization failed\n",
			dev->name);
		return -1;
	}
	/* define general-purpose callback pointer */
	fe0->dvb.frontend->callback = cx23885_tuner_callback;

	/* Put the analog decoder in standby to keep it quiet */
	cx23885_call_i2c_clients(i2c_bus, TUNER_SET_STANDBY, NULL);

	if (fe0->dvb.frontend->ops.analog_ops.standby)
		fe0->dvb.frontend->ops.analog_ops.standby(fe0->dvb.frontend);

	/* register everything */
	return videobuf_dvb_register_bus(&port->frontends, THIS_MODULE, port,
		&dev->pci->dev, adapter_nr, 0);

}

int cx23885_dvb_register(struct cx23885_tsport *port)
{

	struct videobuf_dvb_frontend *fe0;
	struct cx23885_dev *dev = port->dev;
	int err, i;

	/* Here we need to allocate the correct number of frontends,
	 * as reflected in the cards struct. The reality is that currrently
	 * no cx23885 boards support this - yet. But, if we don't modify this
	 * code then the second frontend would never be allocated (later)
	 * and fail with error before the attach in dvb_register().
	 * Without these changes we risk an OOPS later. The changes here
	 * are for safety, and should provide a good foundation for the
	 * future addition of any multi-frontend cx23885 based boards.
	 */
	printk(KERN_INFO "%s() allocating %d frontend(s)\n", __func__,
		port->num_frontends);

	for (i = 1; i <= port->num_frontends; i++) {
		if (videobuf_dvb_alloc_frontend(
			&port->frontends, i) == NULL) {
			printk(KERN_ERR "%s() failed to alloc\n", __func__);
			return -ENOMEM;
		}

		fe0 = videobuf_dvb_get_frontend(&port->frontends, i);
		if (!fe0)
			err = -EINVAL;

		dprintk(1, "%s\n", __func__);
		dprintk(1, " ->probed by Card=%d Name=%s, PCI %02x:%02x\n",
			dev->board,
			dev->name,
			dev->pci_bus,
			dev->pci_slot);

		err = -ENODEV;

		/* dvb stuff */
		/* We have to init the queue for each frontend on a port. */
		printk(KERN_INFO "%s: cx23885 based dvb card\n", dev->name);
		videobuf_queue_sg_init(&fe0->dvb.dvbq, &dvb_qops,
			    &dev->pci->dev, &port->slock,
			    V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_TOP,
			    sizeof(struct cx23885_buffer), port);
	}
	err = dvb_register(port);
	if (err != 0)
		printk(KERN_ERR "%s() dvb_register failed err = %d\n",
			__func__, err);

	return err;
}

int cx23885_dvb_unregister(struct cx23885_tsport *port)
{
	struct videobuf_dvb_frontend *fe0;

	/* FIXME: in an error condition where the we have
	 * an expected number of frontends (attach problem)
	 * then this might not clean up correctly, if 1
	 * is invalid.
	 * This comment only applies to future boards IF they
	 * implement MFE support.
	 */
	fe0 = videobuf_dvb_get_frontend(&port->frontends, 1);
	if (fe0->dvb.frontend)
		videobuf_dvb_unregister_bus(&port->frontends);

	return 0;
}