text: /*
   DVB device driver for em28xx
  
   (c) 2008-2011 Mauro Carvalho Chehab <mchehab@infradead.org>
  
   (c) 2008 Devin Heitmueller <devin.heitmueller@gmail.com>
  	- Fixes for the driver to properly work with HVR-950
  	- Fixes for the driver to properly work with Pinnacle PCTV HD Pro Stick
  	- Fixes for the driver to properly work with AMD ATI TV Wonder HD 600
  
   (c) 2008 Aidan Thornton <makosoft@googlemail.com>
  
   (c) 2012 Frank Schäfer <fschaefer.oss@googlemail.com>
  
   Based on cx88-dvb, saa7134-dvb and videobuf-dvb originally written by:
  	(c) 2004, 2005 Chris Pascoe <c.pascoe@itee.uq.edu.au>
  	(c) 2004 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
  
   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.
   */
  
  #include <linux/kernel.h>
  #include <linux/slab.h>
  #include <linux/usb.h>
  
  #include "em28xx.h"
  #include <media/v4l2-common.h>
  #include <dvb_demux.h>
  #include <dvb_net.h>
  #include <dmxdev.h>
  #include <media/tuner.h>
  #include "tuner-simple.h"
  #include <linux/gpio.h>
  
  #include "lgdt330x.h"
  #include "lgdt3305.h"
  #include "zl10353.h"
  #include "s5h1409.h"
  #include "mt352.h"
  #include "mt352_priv.h" /* FIXME */
  #include "tda1002x.h"
  #include "drx39xyj/drx39xxj.h"
  #include "tda18271.h"
  #include "s921.h"
  #include "drxd.h"
  #include "cxd2820r.h"
  #include "tda18271c2dd.h"
  #include "drxk.h"
  #include "tda10071.h"
  #include "tda18212.h"
  #include "a8293.h"
  #include "qt1010.h"
  #include "mb86a20s.h"
  #include "m88ds3103.h"
  #include "ts2020.h"
  #include "si2168.h"
  #include "si2157.h"
  
  MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
  MODULE_LICENSE("GPL");
  MODULE_DESCRIPTION(DRIVER_DESC " - digital TV interface");
  MODULE_VERSION(EM28XX_VERSION);
  
  static unsigned int debug;
  module_param(debug, int, 0644);
  MODULE_PARM_DESC(debug, "enable debug messages [dvb]");
  
  DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
  
  #define dprintk(level, fmt, arg...) do {			\
  if (debug >= level)						\
  	printk(KERN_DEBUG "%s/2-dvb: " fmt, dev->name, ## arg);	\
  } while (0)
  
  struct em28xx_dvb {
  	struct dvb_frontend        *fe[2];
  
  	/* feed count management */
  	struct mutex               lock;
  	int                        nfeeds;
  
  	/* general boilerplate stuff */
  	struct dvb_adapter         adapter;
  	struct dvb_demux           demux;
  	struct dmxdev              dmxdev;
  	struct dmx_frontend        fe_hw;
  	struct dmx_frontend        fe_mem;
  	struct dvb_net             net;
  
  	/* Due to DRX-K - probably need changes */
  	int (*gate_ctrl)(struct dvb_frontend *, int);
  	struct semaphore      pll_mutex;
  	bool			dont_attach_fe1;
  	int			lna_gpio;
  	struct i2c_client	*i2c_client_demod;
  	struct i2c_client	*i2c_client_tuner;
  	struct i2c_client	*i2c_client_sec;
  };
  
  static inline void print_err_status(struct em28xx *dev,
  				    int packet, int status)
  {
  	char *errmsg = "Unknown";
  
  	switch (status) {
  	case -ENOENT:
  		errmsg = "unlinked synchronuously";
  		break;
  	case -ECONNRESET:
  		errmsg = "unlinked asynchronuously";
  		break;
  	case -ENOSR:
  		errmsg = "Buffer error (overrun)";
  		break;
  	case -EPIPE:
  		errmsg = "Stalled (device not responding)";
  		break;
  	case -EOVERFLOW:
  		errmsg = "Babble (bad cable?)";
  		break;
  	case -EPROTO:
  		errmsg = "Bit-stuff error (bad cable?)";
  		break;
  	case -EILSEQ:
  		errmsg = "CRC/Timeout (could be anything)";
  		break;
  	case -ETIME:
  		errmsg = "Device does not respond";
  		break;
  	}
  	if (packet < 0) {
  		dprintk(1, "URB status %d [%s].\n", status, errmsg);
  	} else {
  		dprintk(1, "URB packet %d, status %d [%s].\n",
  			packet, status, errmsg);
  	}
  }
  
  static inline int em28xx_dvb_urb_data_copy(struct em28xx *dev, struct urb *urb)
  {
  	int xfer_bulk, num_packets, i;
  
  	if (!dev)
  		return 0;
  
  	if (dev->disconnected)
  		return 0;
  
  	if (urb->status < 0)
  		print_err_status(dev, -1, urb->status);
  
  	xfer_bulk = usb_pipebulk(urb->pipe);
  
  	if (xfer_bulk) /* bulk */
  		num_packets = 1;
  	else /* isoc */
  		num_packets = urb->number_of_packets;
  
  	for (i = 0; i < num_packets; i++) {
  		if (xfer_bulk) {
  			if (urb->status < 0) {
  				print_err_status(dev, i, urb->status);
  				if (urb->status != -EPROTO)
  					continue;
  			}
  			if (!urb->actual_length)
  				continue;
  			dvb_dmx_swfilter(&dev->dvb->demux, urb->transfer_buffer,
  					 urb->actual_length);
  		} else {
  			if (urb->iso_frame_desc[i].status < 0) {
  				print_err_status(dev, i,
  						 urb->iso_frame_desc[i].status);
  				if (urb->iso_frame_desc[i].status != -EPROTO)
  					continue;
  			}
  			if (!urb->iso_frame_desc[i].actual_length)
  				continue;
  			dvb_dmx_swfilter(&dev->dvb->demux,
  					 urb->transfer_buffer +
  					 urb->iso_frame_desc[i].offset,
  					 urb->iso_frame_desc[i].actual_length);
  		}
  	}
  
  	return 0;
  }
  
  static int em28xx_start_streaming(struct em28xx_dvb *dvb)
  {
  	int rc;
  	struct em28xx_i2c_bus *i2c_bus = dvb->adapter.priv;
  	struct em28xx *dev = i2c_bus->dev;
  	int dvb_max_packet_size, packet_multiplier, dvb_alt;
  
  	if (dev->dvb_xfer_bulk) {
  		if (!dev->dvb_ep_bulk)
  			return -ENODEV;
  		dvb_max_packet_size = 512; /* USB 2.0 spec */
  		packet_multiplier = EM28XX_DVB_BULK_PACKET_MULTIPLIER;
  		dvb_alt = 0;
  	} else { /* isoc */
  		if (!dev->dvb_ep_isoc)
  			return -ENODEV;
  		dvb_max_packet_size = dev->dvb_max_pkt_size_isoc;
  		if (dvb_max_packet_size < 0)
  			return dvb_max_packet_size;
  		packet_multiplier = EM28XX_DVB_NUM_ISOC_PACKETS;
  		dvb_alt = dev->dvb_alt_isoc;
  	}
  
  	usb_set_interface(dev->udev, dev->ifnum, dvb_alt);
  	rc = em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
  	if (rc < 0)
  		return rc;
  
  	dprintk(1, "Using %d buffers each with %d x %d bytes, alternate %d\n",
  		EM28XX_DVB_NUM_BUFS,
  		packet_multiplier,
  		dvb_max_packet_size, dvb_alt);
  
  	return em28xx_init_usb_xfer(dev, EM28XX_DIGITAL_MODE,
  				    dev->dvb_xfer_bulk,
  				    EM28XX_DVB_NUM_BUFS,
  				    dvb_max_packet_size,
  				    packet_multiplier,
  				    em28xx_dvb_urb_data_copy);
  }
  
  static int em28xx_stop_streaming(struct em28xx_dvb *dvb)
  {
  	struct em28xx_i2c_bus *i2c_bus = dvb->adapter.priv;
  	struct em28xx *dev = i2c_bus->dev;
  
  	em28xx_stop_urbs(dev);
  
  	return 0;
  }
  
  static int em28xx_start_feed(struct dvb_demux_feed *feed)
  {
  	struct dvb_demux *demux  = feed->demux;
  	struct em28xx_dvb *dvb = demux->priv;
  	int rc, ret;
  
  	if (!demux->dmx.frontend)
  		return -EINVAL;
  
  	mutex_lock(&dvb->lock);
  	dvb->nfeeds++;
  	rc = dvb->nfeeds;
  
  	if (dvb->nfeeds == 1) {
  		ret = em28xx_start_streaming(dvb);
  		if (ret < 0)
  			rc = ret;
  	}
  
  	mutex_unlock(&dvb->lock);
  	return rc;
  }
  
  static int em28xx_stop_feed(struct dvb_demux_feed *feed)
  {
  	struct dvb_demux *demux  = feed->demux;
  	struct em28xx_dvb *dvb = demux->priv;
  	int err = 0;
  
  	mutex_lock(&dvb->lock);
  	dvb->nfeeds--;
  
  	if (0 == dvb->nfeeds)
  		err = em28xx_stop_streaming(dvb);
  
  	mutex_unlock(&dvb->lock);
  	return err;
  }
  
  
  /* ------------------------------------------------------------------ */
  static int em28xx_dvb_bus_ctrl(struct dvb_frontend *fe, int acquire)
  {
  	struct em28xx_i2c_bus *i2c_bus = fe->dvb->priv;
  	struct em28xx *dev = i2c_bus->dev;
  
  	if (acquire)
  		return em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
  	else
  		return em28xx_set_mode(dev, EM28XX_SUSPEND);
  }
  
  /* ------------------------------------------------------------------ */
  
  static struct lgdt330x_config em2880_lgdt3303_dev = {
  	.demod_address = 0x0e,
  	.demod_chip = LGDT3303,
  };
  
  static struct lgdt3305_config em2870_lgdt3304_dev = {
  	.i2c_addr           = 0x0e,
  	.demod_chip         = LGDT3304,
  	.spectral_inversion = 1,
  	.deny_i2c_rptr      = 1,
  	.mpeg_mode          = LGDT3305_MPEG_PARALLEL,
  	.tpclk_edge         = LGDT3305_TPCLK_FALLING_EDGE,
  	.tpvalid_polarity   = LGDT3305_TP_VALID_HIGH,
  	.vsb_if_khz         = 3250,
  	.qam_if_khz         = 4000,
  };
  
  static struct lgdt3305_config em2874_lgdt3305_dev = {
  	.i2c_addr           = 0x0e,
  	.demod_chip         = LGDT3305,
  	.spectral_inversion = 1,
  	.deny_i2c_rptr      = 0,
  	.mpeg_mode          = LGDT3305_MPEG_SERIAL,
  	.tpclk_edge         = LGDT3305_TPCLK_FALLING_EDGE,
  	.tpvalid_polarity   = LGDT3305_TP_VALID_HIGH,
  	.vsb_if_khz         = 3250,
  	.qam_if_khz         = 4000,
  };
  
  static struct lgdt3305_config em2874_lgdt3305_nogate_dev = {
  	.i2c_addr           = 0x0e,
  	.demod_chip         = LGDT3305,
  	.spectral_inversion = 1,
  	.deny_i2c_rptr      = 1,
  	.mpeg_mode          = LGDT3305_MPEG_SERIAL,
  	.tpclk_edge         = LGDT3305_TPCLK_FALLING_EDGE,
  	.tpvalid_polarity   = LGDT3305_TP_VALID_HIGH,
  	.vsb_if_khz         = 3600,
  	.qam_if_khz         = 3600,
  };
  
  static struct s921_config sharp_isdbt = {
  	.demod_address = 0x30 >> 1
  };
  
  static struct zl10353_config em28xx_zl10353_with_xc3028 = {
  	.demod_address = (0x1e >> 1),
  	.no_tuner = 1,
  	.parallel_ts = 1,
  	.if2 = 45600,
  };
  
  static struct s5h1409_config em28xx_s5h1409_with_xc3028 = {
  	.demod_address = 0x32 >> 1,
  	.output_mode   = S5H1409_PARALLEL_OUTPUT,
  	.gpio          = S5H1409_GPIO_OFF,
  	.inversion     = S5H1409_INVERSION_OFF,
  	.status_mode   = S5H1409_DEMODLOCKING,
  	.mpeg_timing   = S5H1409_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK
  };
  
  static struct tda18271_std_map kworld_a340_std_map = {
  	.atsc_6   = { .if_freq = 3250, .agc_mode = 3, .std = 0,
  		      .if_lvl = 1, .rfagc_top = 0x37, },
  	.qam_6    = { .if_freq = 4000, .agc_mode = 3, .std = 1,
  		      .if_lvl = 1, .rfagc_top = 0x37, },
  };
  
  static struct tda18271_config kworld_a340_config = {
  	.std_map           = &kworld_a340_std_map,
  };
  
  static struct tda18271_config kworld_ub435q_v2_config = {
  	.std_map	= &kworld_a340_std_map,
  	.gate		= TDA18271_GATE_DIGITAL,
  };
  
  static struct tda18212_config kworld_ub435q_v3_config = {
  	.if_atsc_vsb	= 3600,
  	.if_atsc_qam	= 3600,
  };
  
  static struct zl10353_config em28xx_zl10353_xc3028_no_i2c_gate = {
  	.demod_address = (0x1e >> 1),
  	.no_tuner = 1,
  	.disable_i2c_gate_ctrl = 1,
  	.parallel_ts = 1,
  	.if2 = 45600,
  };
  
  static struct drxd_config em28xx_drxd = {
  	.demod_address = 0x70,
  	.demod_revision = 0xa2,
  	.pll_type = DRXD_PLL_NONE,
  	.clock = 12000,
  	.insert_rs_byte = 1,
  	.IF = 42800000,
  	.disable_i2c_gate_ctrl = 1,
  };
  
  static struct drxk_config terratec_h5_drxk = {
  	.adr = 0x29,
  	.single_master = 1,
  	.no_i2c_bridge = 1,
  	.microcode_name = "dvb-usb-terratec-h5-drxk.fw",
  	.qam_demod_parameter_count = 2,
  };
  
  static struct drxk_config hauppauge_930c_drxk = {
  	.adr = 0x29,
  	.single_master = 1,
  	.no_i2c_bridge = 1,
  	.microcode_name = "dvb-usb-hauppauge-hvr930c-drxk.fw",
  	.chunk_size = 56,
  	.qam_demod_parameter_count = 2,
  };
  
  static struct drxk_config terratec_htc_stick_drxk = {
  	.adr = 0x29,
  	.single_master = 1,
  	.no_i2c_bridge = 1,
  	.microcode_name = "dvb-usb-terratec-htc-stick-drxk.fw",
  	.chunk_size = 54,
  	.qam_demod_parameter_count = 2,
  	/* Required for the antenna_gpio to disable LNA. */
  	.antenna_dvbt = true,
  	/* The windows driver uses the same. This will disable LNA. */
  	.antenna_gpio = 0x6,
  };
  
  static struct drxk_config maxmedia_ub425_tc_drxk = {
  	.adr = 0x29,
  	.single_master = 1,
  	.no_i2c_bridge = 1,
  	.microcode_name = "dvb-demod-drxk-01.fw",
  	.chunk_size = 62,
  	.qam_demod_parameter_count = 2,
  };
  
  static struct drxk_config pctv_520e_drxk = {
  	.adr = 0x29,
  	.single_master = 1,
  	.microcode_name = "dvb-demod-drxk-pctv.fw",
  	.qam_demod_parameter_count = 2,
  	.chunk_size = 58,
  	.antenna_dvbt = true, /* disable LNA */
  	.antenna_gpio = (1 << 2), /* disable LNA */
  };
  
  static int drxk_gate_ctrl(struct dvb_frontend *fe, int enable)
  {
  	struct em28xx_dvb *dvb = fe->sec_priv;
  	int status;
  
  	if (!dvb)
  		return -EINVAL;
  
  	if (enable) {
  		down(&dvb->pll_mutex);
  		status = dvb->gate_ctrl(fe, 1);
  	} else {
  		status = dvb->gate_ctrl(fe, 0);
  		up(&dvb->pll_mutex);
  	}
  	return status;
  }
  
  static void hauppauge_hvr930c_init(struct em28xx *dev)
  {
  	int i;
  
  	struct em28xx_reg_seq hauppauge_hvr930c_init[] = {
  		{EM2874_R80_GPIO_P0_CTRL,	0xff,	0xff,	0x65},
  		{EM2874_R80_GPIO_P0_CTRL,	0xfb,	0xff,	0x32},
  		{EM2874_R80_GPIO_P0_CTRL,	0xff,	0xff,	0xb8},
  		{	-1,			-1,	-1,	-1},
  	};
  	struct em28xx_reg_seq hauppauge_hvr930c_end[] = {
  		{EM2874_R80_GPIO_P0_CTRL,	0xef,	0xff,	0x01},
  		{EM2874_R80_GPIO_P0_CTRL,	0xaf,	0xff,	0x65},
  		{EM2874_R80_GPIO_P0_CTRL,	0xef,	0xff,	0x76},
  		{EM2874_R80_GPIO_P0_CTRL,	0xef,	0xff,	0x01},
  		{EM2874_R80_GPIO_P0_CTRL,	0xcf,	0xff,	0x0b},
  		{EM2874_R80_GPIO_P0_CTRL,	0xef,	0xff,	0x40},
  
  		{EM2874_R80_GPIO_P0_CTRL,	0xcf,	0xff,	0x65},
  		{EM2874_R80_GPIO_P0_CTRL,	0xef,	0xff,	0x65},
  		{EM2874_R80_GPIO_P0_CTRL,	0xcf,	0xff,	0x0b},
  		{EM2874_R80_GPIO_P0_CTRL,	0xef,	0xff,	0x65},
  
  		{	-1,			-1,	-1,	-1},
  	};
  
  	struct {
  		unsigned char r[4];
  		int len;
  	} regs[] = {
  		{{ 0x06, 0x02, 0x00, 0x31 }, 4},
  		{{ 0x01, 0x02 }, 2},
  		{{ 0x01, 0x02, 0x00, 0xc6 }, 4},
  		{{ 0x01, 0x00 }, 2},
  		{{ 0x01, 0x00, 0xff, 0xaf }, 4},
  		{{ 0x01, 0x00, 0x03, 0xa0 }, 4},
  		{{ 0x01, 0x00 }, 2},
  		{{ 0x01, 0x00, 0x73, 0xaf }, 4},
  		{{ 0x04, 0x00 }, 2},
  		{{ 0x00, 0x04 }, 2},
  		{{ 0x00, 0x04, 0x00, 0x0a }, 4},
  		{{ 0x04, 0x14 }, 2},
  		{{ 0x04, 0x14, 0x00, 0x00 }, 4},
  	};
  
  	em28xx_gpio_set(dev, hauppauge_hvr930c_init);
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
  	msleep(10);
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x44);
  	msleep(10);
  
  	dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1;
  
  	for (i = 0; i < ARRAY_SIZE(regs); i++)
  		i2c_master_send(&dev->i2c_client[dev->def_i2c_bus], regs[i].r, regs[i].len);
  	em28xx_gpio_set(dev, hauppauge_hvr930c_end);
  
  	msleep(100);
  
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x44);
  	msleep(30);
  
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x45);
  	msleep(10);
  
  }
  
  static void terratec_h5_init(struct em28xx *dev)
  {
  	int i;
  	struct em28xx_reg_seq terratec_h5_init[] = {
  		{EM2820_R08_GPIO_CTRL,		0xff,	0xff,	10},
  		{EM2874_R80_GPIO_P0_CTRL,	0xf6,	0xff,	100},
  		{EM2874_R80_GPIO_P0_CTRL,	0xf2,	0xff,	50},
  		{EM2874_R80_GPIO_P0_CTRL,	0xf6,	0xff,	100},
  		{	-1,			-1,	-1,	-1},
  	};
  	struct em28xx_reg_seq terratec_h5_end[] = {
  		{EM2874_R80_GPIO_P0_CTRL,	0xe6,	0xff,	100},
  		{EM2874_R80_GPIO_P0_CTRL,	0xa6,	0xff,	50},
  		{EM2874_R80_GPIO_P0_CTRL,	0xe6,	0xff,	100},
  		{	-1,			-1,	-1,	-1},
  	};
  	struct {
  		unsigned char r[4];
  		int len;
  	} regs[] = {
  		{{ 0x06, 0x02, 0x00, 0x31 }, 4},
  		{{ 0x01, 0x02 }, 2},
  		{{ 0x01, 0x02, 0x00, 0xc6 }, 4},
  		{{ 0x01, 0x00 }, 2},
  		{{ 0x01, 0x00, 0xff, 0xaf }, 4},
  		{{ 0x01, 0x00, 0x03, 0xa0 }, 4},
  		{{ 0x01, 0x00 }, 2},
  		{{ 0x01, 0x00, 0x73, 0xaf }, 4},
  		{{ 0x04, 0x00 }, 2},
  		{{ 0x00, 0x04 }, 2},
  		{{ 0x00, 0x04, 0x00, 0x0a }, 4},
  		{{ 0x04, 0x14 }, 2},
  		{{ 0x04, 0x14, 0x00, 0x00 }, 4},
  	};
  
  	em28xx_gpio_set(dev, terratec_h5_init);
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
  	msleep(10);
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x45);
  	msleep(10);
  
  	dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1;
  
  	for (i = 0; i < ARRAY_SIZE(regs); i++)
  		i2c_master_send(&dev->i2c_client[dev->def_i2c_bus], regs[i].r, regs[i].len);
  	em28xx_gpio_set(dev, terratec_h5_end);
  };
  
  static void terratec_htc_stick_init(struct em28xx *dev)
  {
  	int i;
  
  	/*
  	 * GPIO configuration:
  	 * 0xff: unknown (does not affect DVB-T).
  	 * 0xf6: DRX-K (demodulator).
  	 * 0xe6: unknown (does not affect DVB-T).
  	 * 0xb6: unknown (does not affect DVB-T).
  	 */
  	struct em28xx_reg_seq terratec_htc_stick_init[] = {
  		{EM2820_R08_GPIO_CTRL,		0xff,	0xff,	10},
  		{EM2874_R80_GPIO_P0_CTRL,	0xf6,	0xff,	100},
  		{EM2874_R80_GPIO_P0_CTRL,	0xe6,	0xff,	50},
  		{EM2874_R80_GPIO_P0_CTRL,	0xf6,	0xff,	100},
  		{	-1,			-1,	-1,	-1},
  	};
  	struct em28xx_reg_seq terratec_htc_stick_end[] = {
  		{EM2874_R80_GPIO_P0_CTRL,	0xb6,	0xff,	100},
  		{EM2874_R80_GPIO_P0_CTRL,	0xf6,	0xff,	50},
  		{	-1,			-1,	-1,	-1},
  	};
  
  	/*
  	 * Init the analog decoder (not yet supported), but
  	 * it's probably still a good idea.
  	 */
  	struct {
  		unsigned char r[4];
  		int len;
  	} regs[] = {
  		{{ 0x06, 0x02, 0x00, 0x31 }, 4},
  		{{ 0x01, 0x02 }, 2},
  		{{ 0x01, 0x02, 0x00, 0xc6 }, 4},
  		{{ 0x01, 0x00 }, 2},
  		{{ 0x01, 0x00, 0xff, 0xaf }, 4},
  	};
  
  	em28xx_gpio_set(dev, terratec_htc_stick_init);
  
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
  	msleep(10);
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x44);
  	msleep(10);
  
  	dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1;
  
  	for (i = 0; i < ARRAY_SIZE(regs); i++)
  		i2c_master_send(&dev->i2c_client[dev->def_i2c_bus], regs[i].r, regs[i].len);
  
  	em28xx_gpio_set(dev, terratec_htc_stick_end);
  };
  
  static void terratec_htc_usb_xs_init(struct em28xx *dev)
  {
  	int i;
  
  	struct em28xx_reg_seq terratec_htc_usb_xs_init[] = {
  		{EM2820_R08_GPIO_CTRL,		0xff,	0xff,	10},
  		{EM2874_R80_GPIO_P0_CTRL,	0xb2,	0xff,	100},
  		{EM2874_R80_GPIO_P0_CTRL,	0xb2,	0xff,	50},
  		{EM2874_R80_GPIO_P0_CTRL,	0xb6,	0xff,	100},
  		{	-1,			-1,	-1,	-1},
  	};
  	struct em28xx_reg_seq terratec_htc_usb_xs_end[] = {
  		{EM2874_R80_GPIO_P0_CTRL,	0xa6,	0xff,	100},
  		{EM2874_R80_GPIO_P0_CTRL,	0xa6,	0xff,	50},
  		{EM2874_R80_GPIO_P0_CTRL,	0xe6,	0xff,	100},
  		{	-1,			-1,	-1,	-1},
  	};
  
  	/*
  	 * Init the analog decoder (not yet supported), but
  	 * it's probably still a good idea.
  	 */
  	struct {
  		unsigned char r[4];
  		int len;
  	} regs[] = {
  		{{ 0x06, 0x02, 0x00, 0x31 }, 4},
  		{{ 0x01, 0x02 }, 2},
  		{{ 0x01, 0x02, 0x00, 0xc6 }, 4},
  		{{ 0x01, 0x00 }, 2},
  		{{ 0x01, 0x00, 0xff, 0xaf }, 4},
  		{{ 0x01, 0x00, 0x03, 0xa0 }, 4},
  		{{ 0x01, 0x00 }, 2},
  		{{ 0x01, 0x00, 0x73, 0xaf }, 4},
  		{{ 0x04, 0x00 }, 2},
  		{{ 0x00, 0x04 }, 2},
  		{{ 0x00, 0x04, 0x00, 0x0a }, 4},
  		{{ 0x04, 0x14 }, 2},
  		{{ 0x04, 0x14, 0x00, 0x00 }, 4},
  	};
  
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
  
  	em28xx_gpio_set(dev, terratec_htc_usb_xs_init);
  
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x40);
  	msleep(10);
  	em28xx_write_reg(dev, EM28XX_R06_I2C_CLK, 0x44);
  	msleep(10);
  
  	dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1;
  
  	for (i = 0; i < ARRAY_SIZE(regs); i++)
  		i2c_master_send(&dev->i2c_client[dev->def_i2c_bus], regs[i].r, regs[i].len);
  
  	em28xx_gpio_set(dev, terratec_htc_usb_xs_end);
  };
  
  static void pctv_520e_init(struct em28xx *dev)
  {
  	/*
  	 * Init AVF4910B analog decoder. Looks like I2C traffic to
  	 * digital demodulator and tuner are routed via AVF4910B.
  	 */
  	int i;
  	struct {
  		unsigned char r[4];
  		int len;
  	} regs[] = {
  		{{ 0x06, 0x02, 0x00, 0x31 }, 4},
  		{{ 0x01, 0x02 }, 2},
  		{{ 0x01, 0x02, 0x00, 0xc6 }, 4},
  		{{ 0x01, 0x00 }, 2},
  		{{ 0x01, 0x00, 0xff, 0xaf }, 4},
  		{{ 0x01, 0x00, 0x03, 0xa0 }, 4},
  		{{ 0x01, 0x00 }, 2},
  		{{ 0x01, 0x00, 0x73, 0xaf }, 4},
  	};
  
  	dev->i2c_client[dev->def_i2c_bus].addr = 0x82 >> 1; /* 0x41 */
  
  	for (i = 0; i < ARRAY_SIZE(regs); i++)
  		i2c_master_send(&dev->i2c_client[dev->def_i2c_bus], regs[i].r, regs[i].len);
  };
  
  static int em28xx_pctv_290e_set_lna(struct dvb_frontend *fe)
  {
  	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  	struct em28xx_i2c_bus *i2c_bus = fe->dvb->priv;
  	struct em28xx *dev = i2c_bus->dev;
  #ifdef CONFIG_GPIOLIB
  	struct em28xx_dvb *dvb = dev->dvb;
  	int ret;
  	unsigned long flags;
  
  	if (c->lna == 1)
  		flags = GPIOF_OUT_INIT_HIGH; /* enable LNA */
  	else
  		flags = GPIOF_OUT_INIT_LOW; /* disable LNA */
  
  	ret = gpio_request_one(dvb->lna_gpio, flags, NULL);
  	if (ret)
  		em28xx_errdev("gpio request failed %d\n", ret);
  	else
  		gpio_free(dvb->lna_gpio);
  
  	return ret;
  #else
  	dev_warn(&dev->udev->dev, "%s: LNA control is disabled (lna=%u)\n",
  		 KBUILD_MODNAME, c->lna);
  	return 0;
  #endif
  }
  
  static int em28xx_pctv_292e_set_lna(struct dvb_frontend *fe)
  {
  	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
  	struct em28xx_i2c_bus *i2c_bus = fe->dvb->priv;
  	struct em28xx *dev = i2c_bus->dev;
  	u8 lna;
  
  	if (c->lna == 1)
  		lna = 0x01;
  	else
  		lna = 0x00;
  
  	return em28xx_write_reg_bits(dev, EM2874_R80_GPIO_P0_CTRL, lna, 0x01);
  }
  
  static int em28xx_mt352_terratec_xs_init(struct dvb_frontend *fe)
  {
  	/* Values extracted from a USB trace of the Terratec Windows driver */
  	static u8 clock_config[]   = { CLOCK_CTL,  0x38, 0x2c };
  	static u8 reset[]          = { RESET,      0x80 };
  	static u8 adc_ctl_1_cfg[]  = { ADC_CTL_1,  0x40 };
  	static u8 agc_cfg[]        = { AGC_TARGET, 0x28, 0xa0 };
  	static u8 input_freq_cfg[] = { INPUT_FREQ_1, 0x31, 0xb8 };
  	static u8 rs_err_cfg[]     = { RS_ERR_PER_1, 0x00, 0x4d };
  	static u8 capt_range_cfg[] = { CAPT_RANGE, 0x32 };
  	static u8 trl_nom_cfg[]    = { TRL_NOMINAL_RATE_1, 0x64, 0x00 };
  	static u8 tps_given_cfg[]  = { TPS_GIVEN_1, 0x40, 0x80, 0x50 };
  	static u8 tuner_go[]       = { TUNER_GO, 0x01};
  
  	mt352_write(fe, clock_config,   sizeof(clock_config));
  	udelay(200);
  	mt352_write(fe, reset,          sizeof(reset));
  	mt352_write(fe, adc_ctl_1_cfg,  sizeof(adc_ctl_1_cfg));
  	mt352_write(fe, agc_cfg,        sizeof(agc_cfg));
  	mt352_write(fe, input_freq_cfg, sizeof(input_freq_cfg));
  	mt352_write(fe, rs_err_cfg,     sizeof(rs_err_cfg));
  	mt352_write(fe, capt_range_cfg, sizeof(capt_range_cfg));
  	mt352_write(fe, trl_nom_cfg,    sizeof(trl_nom_cfg));
  	mt352_write(fe, tps_given_cfg,  sizeof(tps_given_cfg));
  	mt352_write(fe, tuner_go,       sizeof(tuner_go));
  	return 0;
  }
  
  static struct mt352_config terratec_xs_mt352_cfg = {
  	.demod_address = (0x1e >> 1),
  	.no_tuner = 1,
  	.if2 = 45600,
  	.demod_init = em28xx_mt352_terratec_xs_init,
  };
  
  static struct tda10023_config em28xx_tda10023_config = {
  	.demod_address = 0x0c,
  	.invert = 1,
  };
  
  static struct cxd2820r_config em28xx_cxd2820r_config = {
  	.i2c_address = (0xd8 >> 1),
  	.ts_mode = CXD2820R_TS_SERIAL,
  };
  
  static struct tda18271_config em28xx_cxd2820r_tda18271_config = {
  	.output_opt = TDA18271_OUTPUT_LT_OFF,
  	.gate = TDA18271_GATE_DIGITAL,
  };
  
  static struct zl10353_config em28xx_zl10353_no_i2c_gate_dev = {
  	.demod_address = (0x1e >> 1),
  	.disable_i2c_gate_ctrl = 1,
  	.no_tuner = 1,
  	.parallel_ts = 1,
  };
  
  static struct qt1010_config em28xx_qt1010_config = {
  	.i2c_address = 0x62
  };
  
  static const struct mb86a20s_config c3tech_duo_mb86a20s_config = {
  	.demod_address = 0x10,
  	.is_serial = true,
  };
  
  static struct tda18271_std_map mb86a20s_tda18271_config = {
  	.dvbt_6   = { .if_freq = 4000, .agc_mode = 3, .std = 4,
  		      .if_lvl = 1, .rfagc_top = 0x37, },
  };
  
  static struct tda18271_config c3tech_duo_tda18271_config = {
  	.std_map = &mb86a20s_tda18271_config,
  	.gate    = TDA18271_GATE_DIGITAL,
  	.small_i2c = TDA18271_03_BYTE_CHUNK_INIT,
  };
  
  static const struct m88ds3103_config pctv_461e_m88ds3103_config = {
  	.i2c_addr = 0x68,
  	.clock = 27000000,
  	.i2c_wr_max = 33,
  	.clock_out = 0,
  	.ts_mode = M88DS3103_TS_PARALLEL,
  	.ts_clk = 16000,
  	.ts_clk_pol = 1,
  	.agc = 0x99,
  };
  
  static struct tda18271_std_map drx_j_std_map = {
  	.atsc_6   = { .if_freq = 5000, .agc_mode = 3, .std = 0, .if_lvl = 1,
  		      .rfagc_top = 0x37, },
  	.qam_6    = { .if_freq = 5380, .agc_mode = 3, .std = 3, .if_lvl = 1,
  		      .rfagc_top = 0x37, },
  };
  
  static struct tda18271_config pinnacle_80e_dvb_config = {
  	.std_map = &drx_j_std_map,
  	.gate    = TDA18271_GATE_DIGITAL,
  	.role    = TDA18271_MASTER,
  };
  
  /* ------------------------------------------------------------------ */
  
  static int em28xx_attach_xc3028(u8 addr, struct em28xx *dev)
  {
  	struct dvb_frontend *fe;
  	struct xc2028_config cfg;
  	struct xc2028_ctrl ctl;
  
  	memset(&cfg, 0, sizeof(cfg));
  	cfg.i2c_adap  = &dev->i2c_adap[dev->def_i2c_bus];
  	cfg.i2c_addr  = addr;
  
  	memset(&ctl, 0, sizeof(ctl));
  	em28xx_setup_xc3028(dev, &ctl);
  	cfg.ctrl  = &ctl;
  
  	if (!dev->dvb->fe[0]) {
  		em28xx_errdev("/2: dvb frontend not attached. "
  				"Can't attach xc3028\n");
  		return -EINVAL;
  	}
  
  	fe = dvb_attach(xc2028_attach, dev->dvb->fe[0], &cfg);
  	if (!fe) {
  		em28xx_errdev("/2: xc3028 attach failed\n");
  		dvb_frontend_detach(dev->dvb->fe[0]);
  		dev->dvb->fe[0] = NULL;
  		return -EINVAL;
  	}
  
  	em28xx_info("%s/2: xc3028 attached\n", dev->name);
  
  	return 0;
  }
  
  /* ------------------------------------------------------------------ */
  
  static int em28xx_register_dvb(struct em28xx_dvb *dvb, struct module *module,
  			       struct em28xx *dev, struct device *device)
  {
  	int result;
  
  	mutex_init(&dvb->lock);
  
  	/* register adapter */
  	result = dvb_register_adapter(&dvb->adapter, dev->name, module, device,
  				      adapter_nr);
  	if (result < 0) {
  		printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",
  		       dev->name, result);
  		goto fail_adapter;
  	}
  
  	/* Ensure all frontends negotiate bus access */
  	dvb->fe[0]->ops.ts_bus_ctrl = em28xx_dvb_bus_ctrl;
  	if (dvb->fe[1])
  		dvb->fe[1]->ops.ts_bus_ctrl = em28xx_dvb_bus_ctrl;
  
  	dvb->adapter.priv = &dev->i2c_bus[dev->def_i2c_bus];
  
  	/* register frontend */
  	result = dvb_register_frontend(&dvb->adapter, dvb->fe[0]);
  	if (result < 0) {
  		printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",
  		       dev->name, result);
  		goto fail_frontend0;
  	}
  
  	/* register 2nd frontend */
  	if (dvb->fe[1]) {
  		result = dvb_register_frontend(&dvb->adapter, dvb->fe[1]);
  		if (result < 0) {
  			printk(KERN_WARNING "%s: 2nd dvb_register_frontend failed (errno = %d)\n",
  			       dev->name, result);
  			goto fail_frontend1;
  		}
  	}
  
  	/* register demux stuff */
  	dvb->demux.dmx.capabilities =
  		DMX_TS_FILTERING | DMX_SECTION_FILTERING |
  		DMX_MEMORY_BASED_FILTERING;
  	dvb->demux.priv       = dvb;
  	dvb->demux.filternum  = 256;
  	dvb->demux.feednum    = 256;
  	dvb->demux.start_feed = em28xx_start_feed;
  	dvb->demux.stop_feed  = em28xx_stop_feed;
  
  	result = dvb_dmx_init(&dvb->demux);
  	if (result < 0) {
  		printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",
  		       dev->name, result);
  		goto fail_dmx;
  	}
  
  	dvb->dmxdev.filternum    = 256;
  	dvb->dmxdev.demux        = &dvb->demux.dmx;
  	dvb->dmxdev.capabilities = 0;
  	result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
  	if (result < 0) {
  		printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",
  		       dev->name, result);
  		goto fail_dmxdev;
  	}
  
  	dvb->fe_hw.source = DMX_FRONTEND_0;
  	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
  	if (result < 0) {
  		printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
  		       dev->name, result);
  		goto fail_fe_hw;
  	}
  
  	dvb->fe_mem.source = DMX_MEMORY_FE;
  	result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
  	if (result < 0) {
  		printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
  		       dev->name, result);
  		goto fail_fe_mem;
  	}
  
  	result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
  	if (result < 0) {
  		printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",
  		       dev->name, result);
  		goto fail_fe_conn;
  	}
  
  	/* register network adapter */
  	dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
  	return 0;
  
  fail_fe_conn:
  	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
  fail_fe_mem:
  	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
  fail_fe_hw:
  	dvb_dmxdev_release(&dvb->dmxdev);
  fail_dmxdev:
  	dvb_dmx_release(&dvb->demux);
  fail_dmx:
  	if (dvb->fe[1])
  		dvb_unregister_frontend(dvb->fe[1]);
  	dvb_unregister_frontend(dvb->fe[0]);
  fail_frontend1:
  	if (dvb->fe[1])
  		dvb_frontend_detach(dvb->fe[1]);
  fail_frontend0:
  	dvb_frontend_detach(dvb->fe[0]);
  	dvb_unregister_adapter(&dvb->adapter);
  fail_adapter:
  	return result;
  }
  
  static void em28xx_unregister_dvb(struct em28xx_dvb *dvb)
  {
  	dvb_net_release(&dvb->net);
  	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
  	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
  	dvb_dmxdev_release(&dvb->dmxdev);
  	dvb_dmx_release(&dvb->demux);
  	if (dvb->fe[1])
  		dvb_unregister_frontend(dvb->fe[1]);
  	dvb_unregister_frontend(dvb->fe[0]);
  	if (dvb->fe[1] && !dvb->dont_attach_fe1)
  		dvb_frontend_detach(dvb->fe[1]);
  	dvb_frontend_detach(dvb->fe[0]);
  	dvb_unregister_adapter(&dvb->adapter);
  }
  
  static int em28xx_dvb_init(struct em28xx *dev)
  {
  	int result = 0;
  	struct em28xx_dvb *dvb;
  
  	if (dev->is_audio_only) {
  		/* Shouldn't initialize IR for this interface */
  		return 0;
  	}
  
  	if (!dev->board.has_dvb) {
  		/* This device does not support the extension */
  		return 0;
  	}
  
  	em28xx_info("Binding DVB extension\n");
  
  	dvb = kzalloc(sizeof(struct em28xx_dvb), GFP_KERNEL);
  	if (dvb == NULL) {
  		em28xx_info("em28xx_dvb: memory allocation failed\n");
  		return -ENOMEM;
  	}
  	dev->dvb = dvb;
  	dvb->fe[0] = dvb->fe[1] = NULL;
  
  	/* pre-allocate DVB usb transfer buffers */
  	if (dev->dvb_xfer_bulk) {
  		result = em28xx_alloc_urbs(dev, EM28XX_DIGITAL_MODE,
  					   dev->dvb_xfer_bulk,
  					   EM28XX_DVB_NUM_BUFS,
  					   512,
  					   EM28XX_DVB_BULK_PACKET_MULTIPLIER);
  	} else {
  		result = em28xx_alloc_urbs(dev, EM28XX_DIGITAL_MODE,
  					   dev->dvb_xfer_bulk,
  					   EM28XX_DVB_NUM_BUFS,
  					   dev->dvb_max_pkt_size_isoc,
  					   EM28XX_DVB_NUM_ISOC_PACKETS);
  	}
  	if (result) {
  		em28xx_errdev("em28xx_dvb: failed to pre-allocate USB transfer buffers for DVB.\n");
  		kfree(dvb);
  		dev->dvb = NULL;
  		return result;
  	}
  
  	mutex_lock(&dev->lock);
  	em28xx_set_mode(dev, EM28XX_DIGITAL_MODE);
  	/* init frontend */
  	switch (dev->model) {
  	case EM2874_BOARD_LEADERSHIP_ISDBT:
  		dvb->fe[0] = dvb_attach(s921_attach,
  				&sharp_isdbt, &dev->i2c_adap[dev->def_i2c_bus]);
  
  		if (!dvb->fe[0]) {
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		break;
  	case EM2883_BOARD_HAUPPAUGE_WINTV_HVR_850:
  	case EM2883_BOARD_HAUPPAUGE_WINTV_HVR_950:
  	case EM2880_BOARD_PINNACLE_PCTV_HD_PRO:
  	case EM2880_BOARD_AMD_ATI_TV_WONDER_HD_600:
  		dvb->fe[0] = dvb_attach(lgdt330x_attach,
  					   &em2880_lgdt3303_dev,
  					   &dev->i2c_adap[dev->def_i2c_bus]);
  		if (em28xx_attach_xc3028(0x61, dev) < 0) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case EM2880_BOARD_KWORLD_DVB_310U:
  		dvb->fe[0] = dvb_attach(zl10353_attach,
  					   &em28xx_zl10353_with_xc3028,
  					   &dev->i2c_adap[dev->def_i2c_bus]);
  		if (em28xx_attach_xc3028(0x61, dev) < 0) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900:
  	case EM2882_BOARD_TERRATEC_HYBRID_XS:
  	case EM2880_BOARD_EMPIRE_DUAL_TV:
  		dvb->fe[0] = dvb_attach(zl10353_attach,
  					   &em28xx_zl10353_xc3028_no_i2c_gate,
  					   &dev->i2c_adap[dev->def_i2c_bus]);
  		if (em28xx_attach_xc3028(0x61, dev) < 0) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case EM2880_BOARD_TERRATEC_HYBRID_XS:
  	case EM2880_BOARD_TERRATEC_HYBRID_XS_FR:
  	case EM2881_BOARD_PINNACLE_HYBRID_PRO:
  	case EM2882_BOARD_DIKOM_DK300:
  	case EM2882_BOARD_KWORLD_VS_DVBT:
  		dvb->fe[0] = dvb_attach(zl10353_attach,
  					   &em28xx_zl10353_xc3028_no_i2c_gate,
  					   &dev->i2c_adap[dev->def_i2c_bus]);
  		if (dvb->fe[0] == NULL) {
  			/* This board could have either a zl10353 or a mt352.
  			   If the chip id isn't for zl10353, try mt352 */
  			dvb->fe[0] = dvb_attach(mt352_attach,
  						   &terratec_xs_mt352_cfg,
  						   &dev->i2c_adap[dev->def_i2c_bus]);
  		}
  
  		if (em28xx_attach_xc3028(0x61, dev) < 0) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case EM2870_BOARD_KWORLD_355U:
  		dvb->fe[0] = dvb_attach(zl10353_attach,
  					   &em28xx_zl10353_no_i2c_gate_dev,
  					   &dev->i2c_adap[dev->def_i2c_bus]);
  		if (dvb->fe[0] != NULL)
  			dvb_attach(qt1010_attach, dvb->fe[0],
  				   &dev->i2c_adap[dev->def_i2c_bus], &em28xx_qt1010_config);
  		break;
  	case EM2883_BOARD_KWORLD_HYBRID_330U:
  	case EM2882_BOARD_EVGA_INDTUBE:
  		dvb->fe[0] = dvb_attach(s5h1409_attach,
  					   &em28xx_s5h1409_with_xc3028,
  					   &dev->i2c_adap[dev->def_i2c_bus]);
  		if (em28xx_attach_xc3028(0x61, dev) < 0) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case EM2882_BOARD_KWORLD_ATSC_315U:
  		dvb->fe[0] = dvb_attach(lgdt330x_attach,
  					   &em2880_lgdt3303_dev,
  					   &dev->i2c_adap[dev->def_i2c_bus]);
  		if (dvb->fe[0] != NULL) {
  			if (!dvb_attach(simple_tuner_attach, dvb->fe[0],
  					&dev->i2c_adap[dev->def_i2c_bus],
  					0x61, TUNER_THOMSON_DTT761X)) {
  				result = -EINVAL;
  				goto out_free;
  			}
  		}
  		break;
  	case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900_R2:
  	case EM2882_BOARD_PINNACLE_HYBRID_PRO_330E:
  		dvb->fe[0] = dvb_attach(drxd_attach, &em28xx_drxd, NULL,
  					   &dev->i2c_adap[dev->def_i2c_bus], &dev->udev->dev);
  		if (em28xx_attach_xc3028(0x61, dev) < 0) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case EM2870_BOARD_REDDO_DVB_C_USB_BOX:
  		/* Philips CU1216L NIM (Philips TDA10023 + Infineon TUA6034) */
  		dvb->fe[0] = dvb_attach(tda10023_attach,
  			&em28xx_tda10023_config,
  			&dev->i2c_adap[dev->def_i2c_bus], 0x48);
  		if (dvb->fe[0]) {
  			if (!dvb_attach(simple_tuner_attach, dvb->fe[0],
  					&dev->i2c_adap[dev->def_i2c_bus],
  					0x60, TUNER_PHILIPS_CU1216L)) {
  				result = -EINVAL;
  				goto out_free;
  			}
  		}
  		break;
  	case EM2870_BOARD_KWORLD_A340:
  		dvb->fe[0] = dvb_attach(lgdt3305_attach,
  					   &em2870_lgdt3304_dev,
  					   &dev->i2c_adap[dev->def_i2c_bus]);
  		if (!dvb->fe[0]) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
  				&dev->i2c_adap[dev->def_i2c_bus],
  			&kworld_a340_config)) {
  				dvb_frontend_detach(dvb->fe[0]);
  				result = -EINVAL;
  				goto out_free;
  		}
  		break;
  	case EM28174_BOARD_PCTV_290E:
  		/* set default GPIO0 for LNA, used if GPIOLIB is undefined */
  		dvb->lna_gpio = CXD2820R_GPIO_E | CXD2820R_GPIO_O |
  				CXD2820R_GPIO_L;
  		dvb->fe[0] = dvb_attach(cxd2820r_attach,
  					&em28xx_cxd2820r_config,
  					&dev->i2c_adap[dev->def_i2c_bus],
  					&dvb->lna_gpio);
  		if (dvb->fe[0]) {
  			/* FE 0 attach tuner */
  			if (!dvb_attach(tda18271_attach,
  					dvb->fe[0],
  					0x60,
  					&dev->i2c_adap[dev->def_i2c_bus],
  					&em28xx_cxd2820r_tda18271_config)) {
  
  				dvb_frontend_detach(dvb->fe[0]);
  				result = -EINVAL;
  				goto out_free;
  			}
  
  #ifdef CONFIG_GPIOLIB
  			/* enable LNA for DVB-T, DVB-T2 and DVB-C */
  			result = gpio_request_one(dvb->lna_gpio,
  						  GPIOF_OUT_INIT_LOW, NULL);
  			if (result)
  				em28xx_errdev("gpio request failed %d\n",
  					      result);
  			else
  				gpio_free(dvb->lna_gpio);
  
  			result = 0; /* continue even set LNA fails */
  #endif
  			dvb->fe[0]->ops.set_lna = em28xx_pctv_290e_set_lna;
  		}
  
  		break;
  	case EM2884_BOARD_HAUPPAUGE_WINTV_HVR_930C:
  	{
  		struct xc5000_config cfg;
  
  		hauppauge_hvr930c_init(dev);
  
  		dvb->fe[0] = dvb_attach(drxk_attach,
  					&hauppauge_930c_drxk, &dev->i2c_adap[dev->def_i2c_bus]);
  		if (!dvb->fe[0]) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		/* FIXME: do we need a pll semaphore? */
  		dvb->fe[0]->sec_priv = dvb;
  		sema_init(&dvb->pll_mutex, 1);
  		dvb->gate_ctrl = dvb->fe[0]->ops.i2c_gate_ctrl;
  		dvb->fe[0]->ops.i2c_gate_ctrl = drxk_gate_ctrl;
  
  		/* Attach xc5000 */
  		memset(&cfg, 0, sizeof(cfg));
  		cfg.i2c_address  = 0x61;
  		cfg.if_khz = 4000;
  
  		if (dvb->fe[0]->ops.i2c_gate_ctrl)
  			dvb->fe[0]->ops.i2c_gate_ctrl(dvb->fe[0], 1);
  		if (!dvb_attach(xc5000_attach, dvb->fe[0], &dev->i2c_adap[dev->def_i2c_bus],
  				&cfg)) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		if (dvb->fe[0]->ops.i2c_gate_ctrl)
  			dvb->fe[0]->ops.i2c_gate_ctrl(dvb->fe[0], 0);
  
  		break;
  	}
  	case EM2884_BOARD_TERRATEC_H5:
  		terratec_h5_init(dev);
  
  		dvb->fe[0] = dvb_attach(drxk_attach, &terratec_h5_drxk, &dev->i2c_adap[dev->def_i2c_bus]);
  		if (!dvb->fe[0]) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		/* FIXME: do we need a pll semaphore? */
  		dvb->fe[0]->sec_priv = dvb;
  		sema_init(&dvb->pll_mutex, 1);
  		dvb->gate_ctrl = dvb->fe[0]->ops.i2c_gate_ctrl;
  		dvb->fe[0]->ops.i2c_gate_ctrl = drxk_gate_ctrl;
  
  		/* Attach tda18271 to DVB-C frontend */
  		if (dvb->fe[0]->ops.i2c_gate_ctrl)
  			dvb->fe[0]->ops.i2c_gate_ctrl(dvb->fe[0], 1);
  		if (!dvb_attach(tda18271c2dd_attach, dvb->fe[0], &dev->i2c_adap[dev->def_i2c_bus], 0x60)) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		if (dvb->fe[0]->ops.i2c_gate_ctrl)
  			dvb->fe[0]->ops.i2c_gate_ctrl(dvb->fe[0], 0);
  
  		break;
  	case EM2884_BOARD_C3TECH_DIGITAL_DUO:
  		dvb->fe[0] = dvb_attach(mb86a20s_attach,
  					   &c3tech_duo_mb86a20s_config,
  					   &dev->i2c_adap[dev->def_i2c_bus]);
  		if (dvb->fe[0] != NULL)
  			dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
  				   &dev->i2c_adap[dev->def_i2c_bus],
  				   &c3tech_duo_tda18271_config);
  		break;
  	case EM28174_BOARD_PCTV_460E: {
  		struct i2c_client *client;
  		struct i2c_board_info board_info;
  		struct tda10071_platform_data tda10071_pdata = {};
  		struct a8293_platform_data a8293_pdata = {};
  
  		/* attach demod + tuner combo */
  		tda10071_pdata.clk = 40444000, /* 40.444 MHz */
  		tda10071_pdata.i2c_wr_max = 64,
  		tda10071_pdata.ts_mode = TDA10071_TS_SERIAL,
  		tda10071_pdata.pll_multiplier = 20,
  		tda10071_pdata.tuner_i2c_addr = 0x14,
  		memset(&board_info, 0, sizeof(board_info));
  		strlcpy(board_info.type, "tda10071_cx24118", I2C_NAME_SIZE);
  		board_info.addr = 0x55;
  		board_info.platform_data = &tda10071_pdata;
  		request_module("tda10071");
  		client = i2c_new_device(&dev->i2c_adap[dev->def_i2c_bus], &board_info);
  		if (client == NULL || client->dev.driver == NULL) {
  			result = -ENODEV;
  			goto out_free;
  		}
  		if (!try_module_get(client->dev.driver->owner)) {
  			i2c_unregister_device(client);
  			result = -ENODEV;
  			goto out_free;
  		}
  		dvb->fe[0] = tda10071_pdata.get_dvb_frontend(client);
  		dvb->i2c_client_demod = client;
  
  		/* attach SEC */
  		a8293_pdata.dvb_frontend = dvb->fe[0];
  		memset(&board_info, 0, sizeof(board_info));
  		strlcpy(board_info.type, "a8293", I2C_NAME_SIZE);
  		board_info.addr = 0x08;
  		board_info.platform_data = &a8293_pdata;
  		request_module("a8293");
  		client = i2c_new_device(&dev->i2c_adap[dev->def_i2c_bus], &board_info);
  		if (client == NULL || client->dev.driver == NULL) {
  			module_put(dvb->i2c_client_demod->dev.driver->owner);
  			i2c_unregister_device(dvb->i2c_client_demod);
  			result = -ENODEV;
  			goto out_free;
  		}
  		if (!try_module_get(client->dev.driver->owner)) {
  			i2c_unregister_device(client);
  			module_put(dvb->i2c_client_demod->dev.driver->owner);
  			i2c_unregister_device(dvb->i2c_client_demod);
  			result = -ENODEV;
  			goto out_free;
  		}
  		dvb->i2c_client_sec = client;
  		break;
  	}
  	case EM2874_BOARD_DELOCK_61959:
  	case EM2874_BOARD_MAXMEDIA_UB425_TC:
  		/* attach demodulator */
  		dvb->fe[0] = dvb_attach(drxk_attach, &maxmedia_ub425_tc_drxk,
  				&dev->i2c_adap[dev->def_i2c_bus]);
  
  		if (dvb->fe[0]) {
  			/* disable I2C-gate */
  			dvb->fe[0]->ops.i2c_gate_ctrl = NULL;
  
  			/* attach tuner */
  			if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
  					&dev->i2c_adap[dev->def_i2c_bus],
  					&em28xx_cxd2820r_tda18271_config)) {
  				dvb_frontend_detach(dvb->fe[0]);
  				result = -EINVAL;
  				goto out_free;
  			}
  		}
  		break;
  	case EM2884_BOARD_PCTV_510E:
  	case EM2884_BOARD_PCTV_520E:
  		pctv_520e_init(dev);
  
  		/* attach demodulator */
  		dvb->fe[0] = dvb_attach(drxk_attach, &pctv_520e_drxk,
  				&dev->i2c_adap[dev->def_i2c_bus]);
  
  		if (dvb->fe[0]) {
  			/* attach tuner */
  			if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
  					&dev->i2c_adap[dev->def_i2c_bus],
  					&em28xx_cxd2820r_tda18271_config)) {
  				dvb_frontend_detach(dvb->fe[0]);
  				result = -EINVAL;
  				goto out_free;
  			}
  		}
  		break;
  	case EM2884_BOARD_ELGATO_EYETV_HYBRID_2008:
  	case EM2884_BOARD_CINERGY_HTC_STICK:
  		terratec_htc_stick_init(dev);
  
  		/* attach demodulator */
  		dvb->fe[0] = dvb_attach(drxk_attach, &terratec_htc_stick_drxk,
  					&dev->i2c_adap[dev->def_i2c_bus]);
  		if (!dvb->fe[0]) {
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* Attach the demodulator. */
  		if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
  				&dev->i2c_adap[dev->def_i2c_bus],
  				&em28xx_cxd2820r_tda18271_config)) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case EM2884_BOARD_TERRATEC_HTC_USB_XS:
  		terratec_htc_usb_xs_init(dev);
  
  		/* attach demodulator */
  		dvb->fe[0] = dvb_attach(drxk_attach, &terratec_htc_stick_drxk,
  					&dev->i2c_adap[dev->def_i2c_bus]);
  		if (!dvb->fe[0]) {
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* Attach the demodulator. */
  		if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
  				&dev->i2c_adap[dev->def_i2c_bus],
  				&em28xx_cxd2820r_tda18271_config)) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case EM2874_BOARD_KWORLD_UB435Q_V2:
  		dvb->fe[0] = dvb_attach(lgdt3305_attach,
  					&em2874_lgdt3305_dev,
  					&dev->i2c_adap[dev->def_i2c_bus]);
  		if (!dvb->fe[0]) {
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* Attach the demodulator. */
  		if (!dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
  				&dev->i2c_adap[dev->def_i2c_bus],
  				&kworld_ub435q_v2_config)) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case EM2874_BOARD_KWORLD_UB435Q_V3:
  	{
  		struct i2c_client *client;
  		struct i2c_adapter *adapter = &dev->i2c_adap[dev->def_i2c_bus];
  		struct i2c_board_info board_info = {
  			.type = "tda18212",
  			.addr = 0x60,
  			.platform_data = &kworld_ub435q_v3_config,
  		};
  
  		dvb->fe[0] = dvb_attach(lgdt3305_attach,
  					&em2874_lgdt3305_nogate_dev,
  					&dev->i2c_adap[dev->def_i2c_bus]);
  		if (!dvb->fe[0]) {
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* attach tuner */
  		kworld_ub435q_v3_config.fe = dvb->fe[0];
  		request_module("tda18212");
  		client = i2c_new_device(adapter, &board_info);
  		if (client == NULL || client->dev.driver == NULL) {
  			dvb_frontend_detach(dvb->fe[0]);
  			result = -ENODEV;
  			goto out_free;
  		}
  
  		if (!try_module_get(client->dev.driver->owner)) {
  			i2c_unregister_device(client);
  			dvb_frontend_detach(dvb->fe[0]);
  			result = -ENODEV;
  			goto out_free;
  		}
  
  		dvb->i2c_client_tuner = client;
  		break;
  	}
  	case EM2874_BOARD_PCTV_HD_MINI_80E:
  		dvb->fe[0] = dvb_attach(drx39xxj_attach, &dev->i2c_adap[dev->def_i2c_bus]);
  		if (dvb->fe[0] != NULL) {
  			dvb->fe[0] = dvb_attach(tda18271_attach, dvb->fe[0], 0x60,
  						&dev->i2c_adap[dev->def_i2c_bus],
  						&pinnacle_80e_dvb_config);
  			if (!dvb->fe[0]) {
  				result = -EINVAL;
  				goto out_free;
  			}
  		}
  		break;
  	case EM28178_BOARD_PCTV_461E: {
  		struct i2c_client *client;
  		struct i2c_adapter *i2c_adapter;
  		struct i2c_board_info board_info;
  		struct m88ds3103_platform_data m88ds3103_pdata = {};
  		struct ts2020_config ts2020_config = {};
  		struct a8293_platform_data a8293_pdata = {};
  
  		/* attach demod */
  		m88ds3103_pdata.clk = 27000000;
  		m88ds3103_pdata.i2c_wr_max = 33;
  		m88ds3103_pdata.ts_mode = M88DS3103_TS_PARALLEL;
  		m88ds3103_pdata.ts_clk = 16000;
  		m88ds3103_pdata.ts_clk_pol = 1;
  		m88ds3103_pdata.agc = 0x99;
  		memset(&board_info, 0, sizeof(board_info));
  		strlcpy(board_info.type, "m88ds3103", I2C_NAME_SIZE);
  		board_info.addr = 0x68;
  		board_info.platform_data = &m88ds3103_pdata;
  		request_module("m88ds3103");
  		client = i2c_new_device(&dev->i2c_adap[dev->def_i2c_bus], &board_info);
  		if (client == NULL || client->dev.driver == NULL) {
  			result = -ENODEV;
  			goto out_free;
  		}
  		if (!try_module_get(client->dev.driver->owner)) {
  			i2c_unregister_device(client);
  			result = -ENODEV;
  			goto out_free;
  		}
  		dvb->fe[0] = m88ds3103_pdata.get_dvb_frontend(client);
  		i2c_adapter = m88ds3103_pdata.get_i2c_adapter(client);
  		dvb->i2c_client_demod = client;
  
  		/* attach tuner */
  		ts2020_config.fe = dvb->fe[0];
  		memset(&board_info, 0, sizeof(board_info));
  		strlcpy(board_info.type, "ts2022", I2C_NAME_SIZE);
  		board_info.addr = 0x60;
  		board_info.platform_data = &ts2020_config;
  		request_module("ts2020");
  		client = i2c_new_device(i2c_adapter, &board_info);
  		if (client == NULL || client->dev.driver == NULL) {
  			module_put(dvb->i2c_client_demod->dev.driver->owner);
  			i2c_unregister_device(dvb->i2c_client_demod);
  			result = -ENODEV;
  			goto out_free;
  		}
  		if (!try_module_get(client->dev.driver->owner)) {
  			i2c_unregister_device(client);
  			module_put(dvb->i2c_client_demod->dev.driver->owner);
  			i2c_unregister_device(dvb->i2c_client_demod);
  			result = -ENODEV;
  			goto out_free;
  		}
  		dvb->i2c_client_tuner = client;
  		/* delegate signal strength measurement to tuner */
  		dvb->fe[0]->ops.read_signal_strength =
  				dvb->fe[0]->ops.tuner_ops.get_rf_strength;
  
  		/* attach SEC */
  		a8293_pdata.dvb_frontend = dvb->fe[0];
  		memset(&board_info, 0, sizeof(board_info));
  		strlcpy(board_info.type, "a8293", I2C_NAME_SIZE);
  		board_info.addr = 0x08;
  		board_info.platform_data = &a8293_pdata;
  		request_module("a8293");
  		client = i2c_new_device(&dev->i2c_adap[dev->def_i2c_bus], &board_info);
  		if (client == NULL || client->dev.driver == NULL) {
  			module_put(dvb->i2c_client_tuner->dev.driver->owner);
  			i2c_unregister_device(dvb->i2c_client_tuner);
  			module_put(dvb->i2c_client_demod->dev.driver->owner);
  			i2c_unregister_device(dvb->i2c_client_demod);
  			result = -ENODEV;
  			goto out_free;
  		}
  		if (!try_module_get(client->dev.driver->owner)) {
  			i2c_unregister_device(client);
  			module_put(dvb->i2c_client_tuner->dev.driver->owner);
  			i2c_unregister_device(dvb->i2c_client_tuner);
  			module_put(dvb->i2c_client_demod->dev.driver->owner);
  			i2c_unregister_device(dvb->i2c_client_demod);
  			result = -ENODEV;
  			goto out_free;
  		}
  		dvb->i2c_client_sec = client;
  		break;
  	}
  	case EM28178_BOARD_PCTV_292E:
  		{
  			struct i2c_adapter *adapter;
  			struct i2c_client *client;
  			struct i2c_board_info info;
  			struct si2168_config si2168_config;
  			struct si2157_config si2157_config;
  
  			/* attach demod */
  			memset(&si2168_config, 0, sizeof(si2168_config));
  			si2168_config.i2c_adapter = &adapter;
  			si2168_config.fe = &dvb->fe[0];
  			si2168_config.ts_mode = SI2168_TS_PARALLEL;
  			memset(&info, 0, sizeof(struct i2c_board_info));
  			strlcpy(info.type, "si2168", I2C_NAME_SIZE);
  			info.addr = 0x64;
  			info.platform_data = &si2168_config;
  			request_module(info.type);
  			client = i2c_new_device(&dev->i2c_adap[dev->def_i2c_bus], &info);
  			if (client == NULL || client->dev.driver == NULL) {
  				result = -ENODEV;
  				goto out_free;
  			}
  
  			if (!try_module_get(client->dev.driver->owner)) {
  				i2c_unregister_device(client);
  				result = -ENODEV;
  				goto out_free;
  			}
  
  			dvb->i2c_client_demod = client;
  
  			/* attach tuner */
  			memset(&si2157_config, 0, sizeof(si2157_config));
  			si2157_config.fe = dvb->fe[0];
  			si2157_config.if_port = 1;
  			memset(&info, 0, sizeof(struct i2c_board_info));
  			strlcpy(info.type, "si2157", I2C_NAME_SIZE);
  			info.addr = 0x60;
  			info.platform_data = &si2157_config;
  			request_module(info.type);
  			client = i2c_new_device(adapter, &info);
  			if (client == NULL || client->dev.driver == NULL) {
  				module_put(dvb->i2c_client_demod->dev.driver->owner);
  				i2c_unregister_device(dvb->i2c_client_demod);
  				result = -ENODEV;
  				goto out_free;
  			}
  
  			if (!try_module_get(client->dev.driver->owner)) {
  				i2c_unregister_device(client);
  				module_put(dvb->i2c_client_demod->dev.driver->owner);
  				i2c_unregister_device(dvb->i2c_client_demod);
  				result = -ENODEV;
  				goto out_free;
  			}
  
  			dvb->i2c_client_tuner = client;
  			dvb->fe[0]->ops.set_lna = em28xx_pctv_292e_set_lna;
  		}
  		break;
  	case EM28178_BOARD_TERRATEC_T2_STICK_HD:
  		{
  			struct i2c_adapter *adapter;
  			struct i2c_client *client;
  			struct i2c_board_info info;
  			struct si2168_config si2168_config;
  			struct si2157_config si2157_config;
  
  			/* attach demod */
  			memset(&si2168_config, 0, sizeof(si2168_config));
  			si2168_config.i2c_adapter = &adapter;
  			si2168_config.fe = &dvb->fe[0];
  			si2168_config.ts_mode = SI2168_TS_PARALLEL;
  			memset(&info, 0, sizeof(struct i2c_board_info));
  			strlcpy(info.type, "si2168", I2C_NAME_SIZE);
  			info.addr = 0x64;
  			info.platform_data = &si2168_config;
  			request_module(info.type);
  			client = i2c_new_device(&dev->i2c_adap[dev->def_i2c_bus], &info);
  			if (client == NULL || client->dev.driver == NULL) {
  				result = -ENODEV;
  				goto out_free;
  			}
  
  			if (!try_module_get(client->dev.driver->owner)) {
  				i2c_unregister_device(client);
  				result = -ENODEV;
  				goto out_free;
  			}
  
  			dvb->i2c_client_demod = client;
  
  			/* attach tuner */
  			memset(&si2157_config, 0, sizeof(si2157_config));
  			si2157_config.fe = dvb->fe[0];
  			si2157_config.if_port = 0;
  			memset(&info, 0, sizeof(struct i2c_board_info));
  			strlcpy(info.type, "si2146", I2C_NAME_SIZE);
  			info.addr = 0x60;
  			info.platform_data = &si2157_config;
  			request_module("si2157");
  			client = i2c_new_device(adapter, &info);
  			if (client == NULL || client->dev.driver == NULL) {
  				module_put(dvb->i2c_client_demod->dev.driver->owner);
  				i2c_unregister_device(dvb->i2c_client_demod);
  				result = -ENODEV;
  				goto out_free;
  			}
  
  			if (!try_module_get(client->dev.driver->owner)) {
  				i2c_unregister_device(client);
  				module_put(dvb->i2c_client_demod->dev.driver->owner);
  				i2c_unregister_device(dvb->i2c_client_demod);
  				result = -ENODEV;
  				goto out_free;
  			}
  
  			dvb->i2c_client_tuner = client;
  		}
  		break;
  	default:
  		em28xx_errdev("/2: The frontend of your DVB/ATSC card"
  				" isn't supported yet\n");
  		break;
  	}
  	if (NULL == dvb->fe[0]) {
  		em28xx_errdev("/2: frontend initialization failed\n");
  		result = -EINVAL;
  		goto out_free;
  	}
  	/* define general-purpose callback pointer */
  	dvb->fe[0]->callback = em28xx_tuner_callback;
  	if (dvb->fe[1])
  		dvb->fe[1]->callback = em28xx_tuner_callback;
  
  	/* register everything */
  	result = em28xx_register_dvb(dvb, THIS_MODULE, dev, &dev->udev->dev);
  
  	if (result < 0)
  		goto out_free;
  
  	em28xx_info("DVB extension successfully initialized\n");
  
  	kref_get(&dev->ref);
  
  ret:
  	em28xx_set_mode(dev, EM28XX_SUSPEND);
  	mutex_unlock(&dev->lock);
  	return result;
  
  out_free:
  	kfree(dvb);
  	dev->dvb = NULL;
  	goto ret;
  }
  
  static inline void prevent_sleep(struct dvb_frontend_ops *ops)
  {
  	ops->set_voltage = NULL;
  	ops->sleep = NULL;
  	ops->tuner_ops.sleep = NULL;
  }
  
  static int em28xx_dvb_fini(struct em28xx *dev)
  {
  	struct em28xx_dvb *dvb;
  	struct i2c_client *client;
  
  	if (dev->is_audio_only) {
  		/* Shouldn't initialize IR for this interface */
  		return 0;
  	}
  
  	if (!dev->board.has_dvb) {
  		/* This device does not support the extension */
  		return 0;
  	}
  
  	if (!dev->dvb)
  		return 0;
  
  	em28xx_info("Closing DVB extension\n");
  
  	dvb = dev->dvb;
  
  	em28xx_uninit_usb_xfer(dev, EM28XX_DIGITAL_MODE);
  
  	if (dev->disconnected) {
  		/* We cannot tell the device to sleep
  		 * once it has been unplugged. */
  		if (dvb->fe[0]) {
  			prevent_sleep(&dvb->fe[0]->ops);
  			dvb->fe[0]->exit = DVB_FE_DEVICE_REMOVED;
  		}
  		if (dvb->fe[1]) {
  			prevent_sleep(&dvb->fe[1]->ops);
  			dvb->fe[1]->exit = DVB_FE_DEVICE_REMOVED;
  		}
  	}
  
  	/* remove I2C SEC */
  	client = dvb->i2c_client_sec;
  	if (client) {
  		module_put(client->dev.driver->owner);
  		i2c_unregister_device(client);
  	}
  
  	/* remove I2C tuner */
  	client = dvb->i2c_client_tuner;
  	if (client) {
  		module_put(client->dev.driver->owner);
  		i2c_unregister_device(client);
  	}
  
  	/* remove I2C demod */
  	client = dvb->i2c_client_demod;
  	if (client) {
  		module_put(client->dev.driver->owner);
  		i2c_unregister_device(client);
  	}
  
  	em28xx_unregister_dvb(dvb);
  	kfree(dvb);
  	dev->dvb = NULL;
  	kref_put(&dev->ref, em28xx_free_device);
  
  	return 0;
  }
  
  static int em28xx_dvb_suspend(struct em28xx *dev)
  {
  	int ret = 0;
  
  	if (dev->is_audio_only)
  		return 0;
  
  	if (!dev->board.has_dvb)
  		return 0;
  
  	em28xx_info("Suspending DVB extension\n");
  	if (dev->dvb) {
  		struct em28xx_dvb *dvb = dev->dvb;
  
  		if (dvb->fe[0]) {
  			ret = dvb_frontend_suspend(dvb->fe[0]);
  			em28xx_info("fe0 suspend %d\n", ret);
  		}
  		if (dvb->fe[1]) {
  			dvb_frontend_suspend(dvb->fe[1]);
  			em28xx_info("fe1 suspend %d\n", ret);
  		}
  	}
  
  	return 0;
  }
  
  static int em28xx_dvb_resume(struct em28xx *dev)
  {
  	int ret = 0;
  
  	if (dev->is_audio_only)
  		return 0;
  
  	if (!dev->board.has_dvb)
  		return 0;
  
  	em28xx_info("Resuming DVB extension\n");
  	if (dev->dvb) {
  		struct em28xx_dvb *dvb = dev->dvb;
  
  		if (dvb->fe[0]) {
  			ret = dvb_frontend_resume(dvb->fe[0]);
  			em28xx_info("fe0 resume %d\n", ret);
  		}
  
  		if (dvb->fe[1]) {
  			ret = dvb_frontend_resume(dvb->fe[1]);
  			em28xx_info("fe1 resume %d\n", ret);
  		}
  	}
  
  	return 0;
  }
  
  static struct em28xx_ops dvb_ops = {
  	.id   = EM28XX_DVB,
  	.name = "Em28xx dvb Extension",
  	.init = em28xx_dvb_init,
  	.fini = em28xx_dvb_fini,
  	.suspend = em28xx_dvb_suspend,
  	.resume = em28xx_dvb_resume,
  };
  
  static int __init em28xx_dvb_register(void)
  {
  	return em28xx_register_extension(&dvb_ops);
  }
  
  static void __exit em28xx_dvb_unregister(void)
  {
  	em28xx_unregister_extension(&dvb_ops);
  }
  
  module_init(em28xx_dvb_register);
  module_exit(em28xx_dvb_unregister);
  