xref: /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 "dvb_ca_en50221.h"
#include "s5h1409.h"
#include "s5h1411.h"
#include "mt2131.h"
#include "tda8290.h"
#include "tda18271.h"
#include "lgdt330x.h"
#include "xc4000.h"
#include "xc5000.h"
#include "max2165.h"
#include "tda10048.h"
#include "tuner-xc2028.h"
#include "tuner-simple.h"
#include "dib7000p.h"
#include "dibx000_common.h"
#include "zl10353.h"
#include "stv0900.h"
#include "stv0900_reg.h"
#include "stv6110.h"
#include "lnbh24.h"
#include "cx24116.h"
#include "cimax2.h"
#include "lgs8gxx.h"
#include "netup-eeprom.h"
#include "netup-init.h"
#include "lgdt3305.h"
#include "atbm8830.h"
#include "ds3000.h"
#include "cx23885-f300.h"
#include "altera-ci.h"
#include "stv0367.h"
#include "drxk.h"
#include "mt2063.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 int cx23885_dvb_set_frontend(struct dvb_frontend *fe);

static void cx23885_dvb_gate_ctrl(struct cx23885_tsport  *port, int open)
{
	struct videobuf_dvb_frontends *f;
	struct videobuf_dvb_frontend *fe;

	f = &port->frontends;

	if (f->gate <= 1) /* undefined or fe0 */
		fe = videobuf_dvb_get_frontend(f, 1);
	else
		fe = videobuf_dvb_get_frontend(f, f->gate);

	if (fe && fe->dvb.frontend && fe->dvb.frontend->ops.i2c_gate_ctrl)
		fe->dvb.frontend->ops.i2c_gate_ctrl(fe->dvb.frontend, open);

	/*
	 * FIXME: Improve this path to avoid calling the
	 * cx23885_dvb_set_frontend() every time it passes here.
	 */
	cx23885_dvb_set_frontend(fe->dvb.frontend);
}

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,
	.dtv6_if_freq_khz = TDA10048_IF_3300,
	.dtv7_if_freq_khz = TDA10048_IF_3800,
	.dtv8_if_freq_khz = TDA10048_IF_4300,
	.clk_freq_khz     = TDA10048_CLK_16000,
};

static struct tda10048_config hauppauge_hvr1210_config = {
	.demod_address    = 0x10 >> 1,
	.output_mode      = TDA10048_SERIAL_OUTPUT,
	.fwbulkwritelen   = TDA10048_BULKWRITE_200,
	.inversion        = TDA10048_INVERSION_ON,
	.dtv6_if_freq_khz = TDA10048_IF_3300,
	.dtv7_if_freq_khz = TDA10048_IF_3500,
	.dtv8_if_freq_khz = TDA10048_IF_4000,
	.clk_freq_khz     = TDA10048_CLK_16000,
};

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 s5h1411_config hcw_s5h1411_config = {
	.output_mode   = S5H1411_SERIAL_OUTPUT,
	.gpio          = S5H1411_GPIO_OFF,
	.vsb_if        = S5H1411_IF_44000,
	.qam_if        = S5H1411_IF_4000,
	.inversion     = S5H1411_INVERSION_ON,
	.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_std_map hauppauge_hvr1200_tda18271_std_map = {
	.dvbt_6   = { .if_freq = 3300, .agc_mode = 3, .std = 4,
		      .if_lvl = 1, .rfagc_top = 0x37, },
	.dvbt_7   = { .if_freq = 3800, .agc_mode = 3, .std = 5,
		      .if_lvl = 1, .rfagc_top = 0x37, },
	.dvbt_8   = { .if_freq = 4300, .agc_mode = 3, .std = 6,
		      .if_lvl = 1, .rfagc_top = 0x37, },
};

static struct tda18271_config hauppauge_tda18271_config = {
	.std_map = &hauppauge_tda18271_std_map,
	.gate    = TDA18271_GATE_ANALOG,
	.output_opt = TDA18271_OUTPUT_LT_OFF,
};

static struct tda18271_config hauppauge_hvr1200_tuner_config = {
	.std_map = &hauppauge_hvr1200_tda18271_std_map,
	.gate    = TDA18271_GATE_ANALOG,
	.output_opt = TDA18271_OUTPUT_LT_OFF,
};

static struct tda18271_config hauppauge_hvr1210_tuner_config = {
	.gate    = TDA18271_GATE_DIGITAL,
	.output_opt = TDA18271_OUTPUT_LT_OFF,
};

static struct tda18271_std_map hauppauge_hvr127x_std_map = {
	.atsc_6   = { .if_freq = 3250, .agc_mode = 3, .std = 4,
		      .if_lvl = 1, .rfagc_top = 0x58 },
	.qam_6    = { .if_freq = 4000, .agc_mode = 3, .std = 5,
		      .if_lvl = 1, .rfagc_top = 0x58 },
};

static struct tda18271_config hauppauge_hvr127x_config = {
	.std_map = &hauppauge_hvr127x_std_map,
	.output_opt = TDA18271_OUTPUT_LT_OFF,
};

static struct lgdt3305_config hauppauge_lgdt3305_config = {
	.i2c_addr           = 0x0e,
	.mpeg_mode          = LGDT3305_MPEG_SERIAL,
	.tpclk_edge         = LGDT3305_TPCLK_FALLING_EDGE,
	.tpvalid_polarity   = LGDT3305_TP_VALID_HIGH,
	.deny_i2c_rptr      = 1,
	.spectral_inversion = 1,
	.qam_if_khz         = 4000,
	.vsb_if_khz         = 3250,
};

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,
	.disable_i2c_gate_ctrl = 1,
};

static struct stv0900_reg stv0900_ts_regs[] = {
	{ R0900_TSGENERAL, 0x00 },
	{ R0900_P1_TSSPEED, 0x40 },
	{ R0900_P2_TSSPEED, 0x40 },
	{ R0900_P1_TSCFGM, 0xc0 },
	{ R0900_P2_TSCFGM, 0xc0 },
	{ R0900_P1_TSCFGH, 0xe0 },
	{ R0900_P2_TSCFGH, 0xe0 },
	{ R0900_P1_TSCFGL, 0x20 },
	{ R0900_P2_TSCFGL, 0x20 },
	{ 0xffff, 0xff }, /* terminate */
};

static struct stv0900_config netup_stv0900_config = {
	.demod_address = 0x68,
	.demod_mode = 1, /* dual */
	.xtal = 8000000,
	.clkmode = 3,/* 0-CLKI, 2-XTALI, else AUTO */
	.diseqc_mode = 2,/* 2/3 PWM */
	.ts_config_regs = stv0900_ts_regs,
	.tun1_maddress = 0,/* 0x60 */
	.tun2_maddress = 3,/* 0x63 */
	.tun1_adc = 1,/* 1 Vpp */
	.tun2_adc = 1,/* 1 Vpp */
};

static struct stv6110_config netup_stv6110_tunerconfig_a = {
	.i2c_address = 0x60,
	.mclk = 16000000,
	.clk_div = 1,
	.gain = 8, /* +16 dB  - maximum gain */
};

static struct stv6110_config netup_stv6110_tunerconfig_b = {
	.i2c_address = 0x63,
	.mclk = 16000000,
	.clk_div = 1,
	.gain = 8, /* +16 dB  - maximum gain */
};

static struct cx24116_config tbs_cx24116_config = {
	.demod_address = 0x55,
};

static struct ds3000_config tevii_ds3000_config = {
	.demod_address = 0x68,
};

static struct cx24116_config dvbworld_cx24116_config = {
	.demod_address = 0x05,
};

static struct lgs8gxx_config mygica_x8506_lgs8gl5_config = {
	.prod = LGS8GXX_PROD_LGS8GL5,
	.demod_address = 0x19,
	.serial_ts = 0,
	.ts_clk_pol = 1,
	.ts_clk_gated = 1,
	.if_clk_freq = 30400, /* 30.4 MHz */
	.if_freq = 5380, /* 5.38 MHz */
	.if_neg_center = 1,
	.ext_adc = 0,
	.adc_signed = 0,
	.if_neg_edge = 0,
};

static struct xc5000_config mygica_x8506_xc5000_config = {
	.i2c_address = 0x61,
	.if_khz = 5380,
};

static int cx23885_dvb_set_frontend(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct cx23885_tsport *port = fe->dvb->priv;
	struct cx23885_dev *dev = port->dev;

	switch (dev->board) {
	case CX23885_BOARD_HAUPPAUGE_HVR1275:
		switch (p->modulation) {
		case VSB_8:
			cx23885_gpio_clear(dev, GPIO_5);
			break;
		case QAM_64:
		case QAM_256:
		default:
			cx23885_gpio_set(dev, GPIO_5);
			break;
		}
		break;
	case CX23885_BOARD_MYGICA_X8506:
	case CX23885_BOARD_MAGICPRO_PROHDTVE2:
		/* Select Digital TV */
		cx23885_gpio_set(dev, GPIO_0);
		break;
	}
	return 0;
}

static struct lgs8gxx_config magicpro_prohdtve2_lgs8g75_config = {
	.prod = LGS8GXX_PROD_LGS8G75,
	.demod_address = 0x19,
	.serial_ts = 0,
	.ts_clk_pol = 1,
	.ts_clk_gated = 1,
	.if_clk_freq = 30400, /* 30.4 MHz */
	.if_freq = 6500, /* 6.50 MHz */
	.if_neg_center = 1,
	.ext_adc = 0,
	.adc_signed = 1,
	.adc_vpp = 2, /* 1.6 Vpp */
	.if_neg_edge = 1,
};

static struct xc5000_config magicpro_prohdtve2_xc5000_config = {
	.i2c_address = 0x61,
	.if_khz = 6500,
};

static struct atbm8830_config mygica_x8558pro_atbm8830_cfg1 = {
	.prod = ATBM8830_PROD_8830,
	.demod_address = 0x44,
	.serial_ts = 0,
	.ts_sampling_edge = 1,
	.ts_clk_gated = 0,
	.osc_clk_freq = 30400, /* in kHz */
	.if_freq = 0, /* zero IF */
	.zif_swap_iq = 1,
	.agc_min = 0x2E,
	.agc_max = 0xFF,
	.agc_hold_loop = 0,
};

static struct max2165_config mygic_x8558pro_max2165_cfg1 = {
	.i2c_address = 0x60,
	.osc_clk = 20
};

static struct atbm8830_config mygica_x8558pro_atbm8830_cfg2 = {
	.prod = ATBM8830_PROD_8830,
	.demod_address = 0x44,
	.serial_ts = 1,
	.ts_sampling_edge = 1,
	.ts_clk_gated = 0,
	.osc_clk_freq = 30400, /* in kHz */
	.if_freq = 0, /* zero IF */
	.zif_swap_iq = 1,
	.agc_min = 0x2E,
	.agc_max = 0xFF,
	.agc_hold_loop = 0,
};

static struct max2165_config mygic_x8558pro_max2165_cfg2 = {
	.i2c_address = 0x60,
	.osc_clk = 20
};
static struct stv0367_config netup_stv0367_config[] = {
	{
		.demod_address = 0x1c,
		.xtal = 27000000,
		.if_khz = 4500,
		.if_iq_mode = 0,
		.ts_mode = 1,
		.clk_pol = 0,
	}, {
		.demod_address = 0x1d,
		.xtal = 27000000,
		.if_khz = 4500,
		.if_iq_mode = 0,
		.ts_mode = 1,
		.clk_pol = 0,
	},
};

static struct xc5000_config netup_xc5000_config[] = {
	{
		.i2c_address = 0x61,
		.if_khz = 4500,
	}, {
		.i2c_address = 0x64,
		.if_khz = 4500,
	},
};

static struct drxk_config terratec_drxk_config[] = {
	{
		.adr = 0x29,
		.no_i2c_bridge = 1,
	}, {
		.adr = 0x2a,
		.no_i2c_bridge = 1,
	},
};

static struct mt2063_config terratec_mt2063_config[] = {
	{
		.tuner_address = 0x60,
	}, {
		.tuner_address = 0x67,
	},
};

int netup_altera_fpga_rw(void *device, int flag, int data, int read)
{
	struct cx23885_dev *dev = (struct cx23885_dev *)device;
	unsigned long timeout = jiffies + msecs_to_jiffies(1);
	uint32_t mem = 0;

	mem = cx_read(MC417_RWD);
	if (read)
		cx_set(MC417_OEN, ALT_DATA);
	else {
		cx_clear(MC417_OEN, ALT_DATA);/* D0-D7 out */
		mem &= ~ALT_DATA;
		mem |= (data & ALT_DATA);
	}

	if (flag)
		mem |= ALT_AD_RG;
	else
		mem &= ~ALT_AD_RG;

	mem &= ~ALT_CS;
	if (read)
		mem = (mem & ~ALT_RD) | ALT_WR;
	else
		mem = (mem & ~ALT_WR) | ALT_RD;

	cx_write(MC417_RWD, mem);  /* start RW cycle */

	for (;;) {
		mem = cx_read(MC417_RWD);
		if ((mem & ALT_RDY) == 0)
			break;
		if (time_after(jiffies, timeout))
			break;
		udelay(1);
	}

	cx_set(MC417_RWD, ALT_RD | ALT_WR | ALT_CS);
	if (read)
		return mem & ALT_DATA;

	return 0;
};

static int dvb_register(struct cx23885_tsport *port)
{
	struct cx23885_dev *dev = port->dev;
	struct cx23885_i2c *i2c_bus = NULL, *i2c_bus2 = NULL;
	struct videobuf_dvb_frontend *fe0, *fe1 = NULL;
	int mfe_shared = 0; /* bus not shared by default */
	int ret;

	/* 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;

	/* multi-frontend gate control is undefined or defaults to fe0 */
	port->frontends.gate = 0;

	/* Sets the gate control callback to be used by i2c command calls */
	port->gate_ctrl = cx23885_dvb_gate_ctrl;

	/* 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_HVR1270:
	case CX23885_BOARD_HAUPPAUGE_HVR1275:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(lgdt3305_attach,
					       &hauppauge_lgdt3305_config,
					       &i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			dvb_attach(tda18271_attach, fe0->dvb.frontend,
				   0x60, &dev->i2c_bus[1].i2c_adap,
				   &hauppauge_hvr127x_config);
		}
		break;
	case CX23885_BOARD_HAUPPAUGE_HVR1255:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(s5h1411_attach,
					       &hcw_s5h1411_config,
					       &i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			dvb_attach(tda18271_attach, fe0->dvb.frontend,
				   0x60, &dev->i2c_bus[1].i2c_adap,
				   &hauppauge_tda18271_config);
		}
		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,
				.demod       = 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_HVR1210:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(tda10048_attach,
			&hauppauge_hvr1210_config,
			&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			dvb_attach(tda18271_attach, fe0->dvb.frontend,
				0x60, &dev->i2c_bus[1].i2c_adap,
				&hauppauge_hvr1210_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   = XC3028_FE_DIBCOM52,
				/* 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:
	case CX23885_BOARD_COMPRO_VIDEOMATE_E800:
		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;
	case CX23885_BOARD_LEADTEK_WINFAST_PXDVR3200_H_XC4000:
		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 xc4000_config	cfg = {
				.i2c_address	  = 0x61,
				.default_pm	  = 0,
				.dvb_amplitude	  = 134,
				.set_smoothedcvbs = 1,
				.if_khz		  = 4560
			};

			fe = dvb_attach(xc4000_attach, fe0->dvb.frontend,
					&dev->i2c_bus[1].i2c_adap, &cfg);
			if (!fe) {
				printk(KERN_ERR "%s/2: xc4000 attach failed\n",
				       dev->name);
				goto frontend_detach;
			}
		}
		break;
	case CX23885_BOARD_TBS_6920:
		i2c_bus = &dev->i2c_bus[1];

		fe0->dvb.frontend = dvb_attach(cx24116_attach,
					&tbs_cx24116_config,
					&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL)
			fe0->dvb.frontend->ops.set_voltage = f300_set_voltage;

		break;
	case CX23885_BOARD_TEVII_S470:
		i2c_bus = &dev->i2c_bus[1];

		fe0->dvb.frontend = dvb_attach(ds3000_attach,
					&tevii_ds3000_config,
					&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL)
			fe0->dvb.frontend->ops.set_voltage = f300_set_voltage;

		break;
	case CX23885_BOARD_DVBWORLD_2005:
		i2c_bus = &dev->i2c_bus[1];

		fe0->dvb.frontend = dvb_attach(cx24116_attach,
			&dvbworld_cx24116_config,
			&i2c_bus->i2c_adap);
		break;
	case CX23885_BOARD_NETUP_DUAL_DVBS2_CI:
		i2c_bus = &dev->i2c_bus[0];
		switch (port->nr) {
		/* port B */
		case 1:
			fe0->dvb.frontend = dvb_attach(stv0900_attach,
							&netup_stv0900_config,
							&i2c_bus->i2c_adap, 0);
			if (fe0->dvb.frontend != NULL) {
				if (dvb_attach(stv6110_attach,
						fe0->dvb.frontend,
						&netup_stv6110_tunerconfig_a,
						&i2c_bus->i2c_adap)) {
					if (!dvb_attach(lnbh24_attach,
							fe0->dvb.frontend,
							&i2c_bus->i2c_adap,
							LNBH24_PCL | LNBH24_TTX,
							LNBH24_TEN, 0x09))
						printk(KERN_ERR
							"No LNBH24 found!\n");

				}
			}
			break;
		/* port C */
		case 2:
			fe0->dvb.frontend = dvb_attach(stv0900_attach,
							&netup_stv0900_config,
							&i2c_bus->i2c_adap, 1);
			if (fe0->dvb.frontend != NULL) {
				if (dvb_attach(stv6110_attach,
						fe0->dvb.frontend,
						&netup_stv6110_tunerconfig_b,
						&i2c_bus->i2c_adap)) {
					if (!dvb_attach(lnbh24_attach,
							fe0->dvb.frontend,
							&i2c_bus->i2c_adap,
							LNBH24_PCL | LNBH24_TTX,
							LNBH24_TEN, 0x0a))
						printk(KERN_ERR
							"No LNBH24 found!\n");

				}
			}
			break;
		}
		break;
	case CX23885_BOARD_MYGICA_X8506:
		i2c_bus = &dev->i2c_bus[0];
		i2c_bus2 = &dev->i2c_bus[1];
		fe0->dvb.frontend = dvb_attach(lgs8gxx_attach,
			&mygica_x8506_lgs8gl5_config,
			&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			dvb_attach(xc5000_attach,
				fe0->dvb.frontend,
				&i2c_bus2->i2c_adap,
				&mygica_x8506_xc5000_config);
		}
		break;
	case CX23885_BOARD_MAGICPRO_PROHDTVE2:
		i2c_bus = &dev->i2c_bus[0];
		i2c_bus2 = &dev->i2c_bus[1];
		fe0->dvb.frontend = dvb_attach(lgs8gxx_attach,
			&magicpro_prohdtve2_lgs8g75_config,
			&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			dvb_attach(xc5000_attach,
				fe0->dvb.frontend,
				&i2c_bus2->i2c_adap,
				&magicpro_prohdtve2_xc5000_config);
		}
		break;
	case CX23885_BOARD_HAUPPAUGE_HVR1850:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(s5h1411_attach,
			&hcw_s5h1411_config,
			&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL)
			dvb_attach(tda18271_attach, fe0->dvb.frontend,
				0x60, &dev->i2c_bus[0].i2c_adap,
				&hauppauge_tda18271_config);

		tda18271_attach(&dev->ts1.analog_fe,
			0x60, &dev->i2c_bus[1].i2c_adap,
			&hauppauge_tda18271_config);

		break;
	case CX23885_BOARD_HAUPPAUGE_HVR1290:
		i2c_bus = &dev->i2c_bus[0];
		fe0->dvb.frontend = dvb_attach(s5h1411_attach,
			&hcw_s5h1411_config,
			&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL)
			dvb_attach(tda18271_attach, fe0->dvb.frontend,
				0x60, &dev->i2c_bus[0].i2c_adap,
				&hauppauge_tda18271_config);
		break;
	case CX23885_BOARD_MYGICA_X8558PRO:
		switch (port->nr) {
		/* port B */
		case 1:
			i2c_bus = &dev->i2c_bus[0];
			fe0->dvb.frontend = dvb_attach(atbm8830_attach,
				&mygica_x8558pro_atbm8830_cfg1,
				&i2c_bus->i2c_adap);
			if (fe0->dvb.frontend != NULL) {
				dvb_attach(max2165_attach,
					fe0->dvb.frontend,
					&i2c_bus->i2c_adap,
					&mygic_x8558pro_max2165_cfg1);
			}
			break;
		/* port C */
		case 2:
			i2c_bus = &dev->i2c_bus[1];
			fe0->dvb.frontend = dvb_attach(atbm8830_attach,
				&mygica_x8558pro_atbm8830_cfg2,
				&i2c_bus->i2c_adap);
			if (fe0->dvb.frontend != NULL) {
				dvb_attach(max2165_attach,
					fe0->dvb.frontend,
					&i2c_bus->i2c_adap,
					&mygic_x8558pro_max2165_cfg2);
			}
			break;
		}
		break;
	case CX23885_BOARD_NETUP_DUAL_DVB_T_C_CI_RF:
		i2c_bus = &dev->i2c_bus[0];
		mfe_shared = 1;/* MFE */
		port->frontends.gate = 0;/* not clear for me yet */
		/* ports B, C */
		/* MFE frontend 1 DVB-T */
		fe0->dvb.frontend = dvb_attach(stv0367ter_attach,
					&netup_stv0367_config[port->nr - 1],
					&i2c_bus->i2c_adap);
		if (fe0->dvb.frontend != NULL) {
			if (NULL == dvb_attach(xc5000_attach,
					fe0->dvb.frontend,
					&i2c_bus->i2c_adap,
					&netup_xc5000_config[port->nr - 1]))
				goto frontend_detach;
			/* load xc5000 firmware */
			fe0->dvb.frontend->ops.tuner_ops.init(fe0->dvb.frontend);
		}
		/* MFE frontend 2 */
		fe1 = videobuf_dvb_get_frontend(&port->frontends, 2);
		if (fe1 == NULL)
			goto frontend_detach;
		/* DVB-C init */
		fe1->dvb.frontend = dvb_attach(stv0367cab_attach,
					&netup_stv0367_config[port->nr - 1],
					&i2c_bus->i2c_adap);
		if (fe1->dvb.frontend != NULL) {
			fe1->dvb.frontend->id = 1;
			if (NULL == dvb_attach(xc5000_attach,
					fe1->dvb.frontend,
					&i2c_bus->i2c_adap,
					&netup_xc5000_config[port->nr - 1]))
				goto frontend_detach;
		}
		break;
	case CX23885_BOARD_TERRATEC_CINERGY_T_PCIE_DUAL:
		i2c_bus = &dev->i2c_bus[0];
		i2c_bus2 = &dev->i2c_bus[1];

		switch (port->nr) {
		/* port b */
		case 1:
			fe0->dvb.frontend = dvb_attach(drxk_attach,
					&terratec_drxk_config[0],
					&i2c_bus->i2c_adap);
			if (fe0->dvb.frontend != NULL) {
				if (!dvb_attach(mt2063_attach,
						fe0->dvb.frontend,
						&terratec_mt2063_config[0],
						&i2c_bus2->i2c_adap))
					goto frontend_detach;
			}
			break;
		/* port c */
		case 2:
			fe0->dvb.frontend = dvb_attach(drxk_attach,
					&terratec_drxk_config[1],
					&i2c_bus->i2c_adap);
			if (fe0->dvb.frontend != NULL) {
				if (!dvb_attach(mt2063_attach,
						fe0->dvb.frontend,
						&terratec_mt2063_config[1],
						&i2c_bus2->i2c_adap))
					goto frontend_detach;
			}
			break;
		}
		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) || (fe1 && NULL == fe1->dvb.frontend)) {
		printk(KERN_ERR "%s: frontend initialization failed\n",
		       dev->name);
		goto frontend_detach;
	}

	/* define general-purpose callback pointer */
	fe0->dvb.frontend->callback = cx23885_tuner_callback;
	if (fe1)
		fe1->dvb.frontend->callback = cx23885_tuner_callback;
#if 0
	/* Ensure all frontends negotiate bus access */
	fe0->dvb.frontend->ops.ts_bus_ctrl = cx23885_dvb_bus_ctrl;
	if (fe1)
		fe1->dvb.frontend->ops.ts_bus_ctrl = cx23885_dvb_bus_ctrl;
#endif

	/* Put the analog decoder in standby to keep it quiet */
	call_all(dev, core, s_power, 0);

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

	/* register everything */
	ret = videobuf_dvb_register_bus(&port->frontends, THIS_MODULE, port,
					&dev->pci->dev, adapter_nr, mfe_shared,
					NULL);
	if (ret)
		goto frontend_detach;

	/* init CI & MAC */
	switch (dev->board) {
	case CX23885_BOARD_NETUP_DUAL_DVBS2_CI: {
		static struct netup_card_info cinfo;

		netup_get_card_info(&dev->i2c_bus[0].i2c_adap, &cinfo);
		memcpy(port->frontends.adapter.proposed_mac,
				cinfo.port[port->nr - 1].mac, 6);
		printk(KERN_INFO "NetUP Dual DVB-S2 CI card port%d MAC=%pM\n",
			port->nr, port->frontends.adapter.proposed_mac);

		netup_ci_init(port);
		break;
		}
	case CX23885_BOARD_NETUP_DUAL_DVB_T_C_CI_RF: {
		struct altera_ci_config netup_ci_cfg = {
			.dev = dev,/* magic number to identify*/
			.adapter = &port->frontends.adapter,/* for CI */
			.demux = &fe0->dvb.demux,/* for hw pid filter */
			.fpga_rw = netup_altera_fpga_rw,
		};

		altera_ci_init(&netup_ci_cfg, port->nr);
		break;
		}
	case CX23885_BOARD_TEVII_S470: {
		u8 eeprom[256]; /* 24C02 i2c eeprom */

		if (port->nr != 1)
			break;

		/* Read entire EEPROM */
		dev->i2c_bus[0].i2c_client.addr = 0xa0 >> 1;
		tveeprom_read(&dev->i2c_bus[0].i2c_client, eeprom, sizeof(eeprom));
		printk(KERN_INFO "TeVii S470 MAC= %pM\n", eeprom + 0xa0);
		memcpy(port->frontends.adapter.proposed_mac, eeprom + 0xa0, 6);
		break;
		}
	}

	return ret;

frontend_detach:
	port->gate_ctrl = NULL;
	videobuf_dvb_dealloc_frontends(&port->frontends);
	return -EINVAL;
}

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 currently
	 * 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, NULL);
	}
	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 && fe0->dvb.frontend)
		videobuf_dvb_unregister_bus(&port->frontends);

	switch (port->dev->board) {
	case CX23885_BOARD_NETUP_DUAL_DVBS2_CI:
		netup_ci_exit(port);
		break;
	case CX23885_BOARD_NETUP_DUAL_DVB_T_C_CI_RF:
		altera_ci_release(port->dev, port->nr);
		break;
	}

	port->gate_ctrl = NULL;

	return 0;
}