text: /*
   DVB device driver for cx231xx
  
   Copyright (C) 2008 <srinivasa.deevi at conexant dot com>
  		Based on em28xx driver
  
   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 "cx231xx.h"
  #include <linux/kernel.h>
  #include <linux/slab.h>
  
  #include <media/v4l2-common.h>
  #include <media/videobuf-vmalloc.h>
  
  #include "xc5000.h"
  #include "s5h1432.h"
  #include "tda18271.h"
  #include "s5h1411.h"
  #include "lgdt3305.h"
  #include "si2165.h"
  #include "mb86a20s.h"
  #include "si2157.h"
  #include "lgdt3306a.h"
  
  MODULE_DESCRIPTION("driver for cx231xx based DVB cards");
  MODULE_AUTHOR("Srinivasa Deevi <srinivasa.deevi@conexant.com>");
  MODULE_LICENSE("GPL");
  
  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 CX231XX_DVB_NUM_BUFS 5
  #define CX231XX_DVB_MAX_PACKETSIZE 564
  #define CX231XX_DVB_MAX_PACKETS 64
  
  struct cx231xx_dvb {
  	struct dvb_frontend *frontend;
  
  	/* 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;
  	struct i2c_client *i2c_client_tuner;
  };
  
  static struct s5h1432_config dvico_s5h1432_config = {
  	.output_mode   = S5H1432_SERIAL_OUTPUT,
  	.gpio          = S5H1432_GPIO_ON,
  	.qam_if        = S5H1432_IF_4000,
  	.vsb_if        = S5H1432_IF_4000,
  	.inversion     = S5H1432_INVERSION_OFF,
  	.status_mode   = S5H1432_DEMODLOCKING,
  	.mpeg_timing   = S5H1432_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
  };
  
  static struct tda18271_std_map cnxt_rde253s_tda18271_std_map = {
  	.dvbt_6   = { .if_freq = 4000, .agc_mode = 3, .std = 4,
  		      .if_lvl = 1, .rfagc_top = 0x37, },
  	.dvbt_7   = { .if_freq = 4000, .agc_mode = 3, .std = 5,
  		      .if_lvl = 1, .rfagc_top = 0x37, },
  	.dvbt_8   = { .if_freq = 4000, .agc_mode = 3, .std = 6,
  		      .if_lvl = 1, .rfagc_top = 0x37, },
  };
  
  static struct tda18271_std_map mb86a20s_tda18271_config = {
  	.dvbt_6   = { .if_freq = 4000, .agc_mode = 3, .std = 4,
  		      .if_lvl = 0, .rfagc_top = 0x37, },
  };
  
  static struct tda18271_config cnxt_rde253s_tunerconfig = {
  	.std_map = &cnxt_rde253s_tda18271_std_map,
  	.gate    = TDA18271_GATE_ANALOG,
  };
  
  static struct s5h1411_config tda18271_s5h1411_config = {
  	.output_mode   = S5H1411_SERIAL_OUTPUT,
  	.gpio          = S5H1411_GPIO_OFF,
  	.vsb_if        = S5H1411_IF_3250,
  	.qam_if        = S5H1411_IF_4000,
  	.inversion     = S5H1411_INVERSION_ON,
  	.status_mode   = S5H1411_DEMODLOCKING,
  	.mpeg_timing   = S5H1411_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
  };
  static struct s5h1411_config xc5000_s5h1411_config = {
  	.output_mode   = S5H1411_SERIAL_OUTPUT,
  	.gpio          = S5H1411_GPIO_OFF,
  	.vsb_if        = S5H1411_IF_3250,
  	.qam_if        = S5H1411_IF_3250,
  	.inversion     = S5H1411_INVERSION_OFF,
  	.status_mode   = S5H1411_DEMODLOCKING,
  	.mpeg_timing   = S5H1411_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
  };
  
  static struct lgdt3305_config hcw_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 tda18271_std_map hauppauge_tda18271_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 hcw_tda18271_config = {
  	.std_map = &hauppauge_tda18271_std_map,
  	.gate    = TDA18271_GATE_DIGITAL,
  };
  
  static const struct mb86a20s_config pv_mb86a20s_config = {
  	.demod_address = 0x10,
  	.is_serial = true,
  };
  
  static struct tda18271_config pv_tda18271_config = {
  	.std_map = &mb86a20s_tda18271_config,
  	.gate    = TDA18271_GATE_DIGITAL,
  	.small_i2c = TDA18271_03_BYTE_CHUNK_INIT,
  };
  
  static const struct si2165_config hauppauge_930C_HD_1113xx_si2165_config = {
  	.i2c_addr	= 0x64,
  	.chip_mode	= SI2165_MODE_PLL_XTAL,
  	.ref_freq_Hz	= 16000000,
  };
  
  static const struct si2165_config pctv_quatro_stick_1114xx_si2165_config = {
  	.i2c_addr	= 0x64,
  	.chip_mode	= SI2165_MODE_PLL_EXT,
  	.ref_freq_Hz	= 24000000,
  };
  
  static struct lgdt3306a_config hauppauge_955q_lgdt3306a_config = {
  	.i2c_addr           = 0x59,
  	.qam_if_khz         = 4000,
  	.vsb_if_khz         = 3250,
  	.deny_i2c_rptr      = 1,
  	.spectral_inversion = 1,
  	.mpeg_mode          = LGDT3306A_MPEG_SERIAL,
  	.tpclk_edge         = LGDT3306A_TPCLK_RISING_EDGE,
  	.tpvalid_polarity   = LGDT3306A_TP_VALID_HIGH,
  	.xtalMHz            = 25,
  };
  
  static inline void print_err_status(struct cx231xx *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) {
  		dev_dbg(dev->dev,
  			"URB status %d [%s].\n", status, errmsg);
  	} else {
  		dev_dbg(dev->dev,
  			"URB packet %d, status %d [%s].\n",
  			packet, status, errmsg);
  	}
  }
  
  static inline int dvb_isoc_copy(struct cx231xx *dev, struct urb *urb)
  {
  	int i;
  
  	if (!dev)
  		return 0;
  
  	if (dev->state & DEV_DISCONNECTED)
  		return 0;
  
  	if (urb->status < 0) {
  		print_err_status(dev, -1, urb->status);
  		if (urb->status == -ENOENT)
  			return 0;
  	}
  
  	for (i = 0; i < urb->number_of_packets; i++) {
  		int status = urb->iso_frame_desc[i].status;
  
  		if (status < 0) {
  			print_err_status(dev, i, status);
  			if (urb->iso_frame_desc[i].status != -EPROTO)
  				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 inline int dvb_bulk_copy(struct cx231xx *dev, struct urb *urb)
  {
  	if (!dev)
  		return 0;
  
  	if (dev->state & DEV_DISCONNECTED)
  		return 0;
  
  	if (urb->status < 0) {
  		print_err_status(dev, -1, urb->status);
  		if (urb->status == -ENOENT)
  			return 0;
  	}
  
  	/* Feed the transport payload into the kernel demux */
  	dvb_dmx_swfilter(&dev->dvb->demux,
  		urb->transfer_buffer, urb->actual_length);
  
  	return 0;
  }
  
  static int start_streaming(struct cx231xx_dvb *dvb)
  {
  	int rc;
  	struct cx231xx *dev = dvb->adapter.priv;
  
  	if (dev->USE_ISO) {
  		dev_dbg(dev->dev, "DVB transfer mode is ISO.\n");
  		cx231xx_set_alt_setting(dev, INDEX_TS1, 4);
  		rc = cx231xx_set_mode(dev, CX231XX_DIGITAL_MODE);
  		if (rc < 0)
  			return rc;
  		dev->mode_tv = 1;
  		return cx231xx_init_isoc(dev, CX231XX_DVB_MAX_PACKETS,
  					CX231XX_DVB_NUM_BUFS,
  					dev->ts1_mode.max_pkt_size,
  					dvb_isoc_copy);
  	} else {
  		dev_dbg(dev->dev, "DVB transfer mode is BULK.\n");
  		cx231xx_set_alt_setting(dev, INDEX_TS1, 0);
  		rc = cx231xx_set_mode(dev, CX231XX_DIGITAL_MODE);
  		if (rc < 0)
  			return rc;
  		dev->mode_tv = 1;
  		return cx231xx_init_bulk(dev, CX231XX_DVB_MAX_PACKETS,
  					CX231XX_DVB_NUM_BUFS,
  					dev->ts1_mode.max_pkt_size,
  					dvb_bulk_copy);
  	}
  
  }
  
  static int stop_streaming(struct cx231xx_dvb *dvb)
  {
  	struct cx231xx *dev = dvb->adapter.priv;
  
  	if (dev->USE_ISO)
  		cx231xx_uninit_isoc(dev);
  	else
  		cx231xx_uninit_bulk(dev);
  
  	cx231xx_set_mode(dev, CX231XX_SUSPEND);
  
  	return 0;
  }
  
  static int start_feed(struct dvb_demux_feed *feed)
  {
  	struct dvb_demux *demux = feed->demux;
  	struct cx231xx_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 = start_streaming(dvb);
  		if (ret < 0)
  			rc = ret;
  	}
  
  	mutex_unlock(&dvb->lock);
  	return rc;
  }
  
  static int stop_feed(struct dvb_demux_feed *feed)
  {
  	struct dvb_demux *demux = feed->demux;
  	struct cx231xx_dvb *dvb = demux->priv;
  	int err = 0;
  
  	mutex_lock(&dvb->lock);
  	dvb->nfeeds--;
  
  	if (0 == dvb->nfeeds)
  		err = stop_streaming(dvb);
  
  	mutex_unlock(&dvb->lock);
  	return err;
  }
  
  /* ------------------------------------------------------------------ */
  static int cx231xx_dvb_bus_ctrl(struct dvb_frontend *fe, int acquire)
  {
  	struct cx231xx *dev = fe->dvb->priv;
  
  	if (acquire)
  		return cx231xx_set_mode(dev, CX231XX_DIGITAL_MODE);
  	else
  		return cx231xx_set_mode(dev, CX231XX_SUSPEND);
  }
  
  /* ------------------------------------------------------------------ */
  
  static struct xc5000_config cnxt_rde250_tunerconfig = {
  	.i2c_address = 0x61,
  	.if_khz = 4000,
  };
  static struct xc5000_config cnxt_rdu250_tunerconfig = {
  	.i2c_address = 0x61,
  	.if_khz = 3250,
  };
  
  /* ------------------------------------------------------------------ */
  #if 0
  static int attach_xc5000(u8 addr, struct cx231xx *dev)
  {
  
  	struct dvb_frontend *fe;
  	struct xc5000_config cfg;
  
  	memset(&cfg, 0, sizeof(cfg));
  	cfg.i2c_adap = cx231xx_get_i2c_adap(dev, dev->board.tuner_i2c_master);
  	cfg.i2c_addr = addr;
  
  	if (!dev->dvb->frontend) {
  		dev_err(dev->dev, "%s/2: dvb frontend not attached. "
  		       "Can't attach xc5000\n", dev->name);
  		return -EINVAL;
  	}
  
  	fe = dvb_attach(xc5000_attach, dev->dvb->frontend, &cfg);
  	if (!fe) {
  		dev_err(dev->dev, "%s/2: xc5000 attach failed\n", dev->name);
  		dvb_frontend_detach(dev->dvb->frontend);
  		dev->dvb->frontend = NULL;
  		return -EINVAL;
  	}
  
  	dev_info(dev->dev, "%s/2: xc5000 attached\n", dev->name);
  
  	return 0;
  }
  #endif
  
  int cx231xx_set_analog_freq(struct cx231xx *dev, u32 freq)
  {
  	if ((dev->dvb != NULL) && (dev->dvb->frontend != NULL)) {
  
  		struct dvb_tuner_ops *dops = &dev->dvb->frontend->ops.tuner_ops;
  
  		if (dops->set_analog_params != NULL) {
  			struct analog_parameters params;
  
  			params.frequency = freq;
  			params.std = dev->norm;
  			params.mode = 0;	/* 0- Air; 1 - cable */
  			/*params.audmode = ;       */
  
  			/* Set the analog parameters to set the frequency */
  			dops->set_analog_params(dev->dvb->frontend, &params);
  		}
  
  	}
  
  	return 0;
  }
  
  int cx231xx_reset_analog_tuner(struct cx231xx *dev)
  {
  	int status = 0;
  
  	if ((dev->dvb != NULL) && (dev->dvb->frontend != NULL)) {
  
  		struct dvb_tuner_ops *dops = &dev->dvb->frontend->ops.tuner_ops;
  
  		if (dops->init != NULL && !dev->xc_fw_load_done) {
  
  			dev_dbg(dev->dev,
  				"Reloading firmware for XC5000\n");
  			status = dops->init(dev->dvb->frontend);
  			if (status == 0) {
  				dev->xc_fw_load_done = 1;
  				dev_dbg(dev->dev,
  					"XC5000 firmware download completed\n");
  			} else {
  				dev->xc_fw_load_done = 0;
  				dev_dbg(dev->dev,
  					"XC5000 firmware download failed !!!\n");
  			}
  		}
  
  	}
  
  	return status;
  }
  
  /* ------------------------------------------------------------------ */
  
  static int register_dvb(struct cx231xx_dvb *dvb,
  			struct module *module,
  			struct cx231xx *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) {
  		dev_warn(dev->dev,
  		       "%s: dvb_register_adapter failed (errno = %d)\n",
  		       dev->name, result);
  		goto fail_adapter;
  	}
  	dvb_register_media_controller(&dvb->adapter, dev->media_dev);
  
  	/* Ensure all frontends negotiate bus access */
  	dvb->frontend->ops.ts_bus_ctrl = cx231xx_dvb_bus_ctrl;
  
  	dvb->adapter.priv = dev;
  
  	/* register frontend */
  	result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
  	if (result < 0) {
  		dev_warn(dev->dev,
  		       "%s: dvb_register_frontend failed (errno = %d)\n",
  		       dev->name, result);
  		goto fail_frontend;
  	}
  
  	/* 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 = start_feed;
  	dvb->demux.stop_feed = stop_feed;
  
  	result = dvb_dmx_init(&dvb->demux);
  	if (result < 0) {
  		dev_warn(dev->dev,
  			 "%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) {
  		dev_warn(dev->dev,
  			 "%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) {
  		dev_warn(dev->dev,
  		       "%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) {
  		dev_warn(dev->dev,
  			 "%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) {
  		dev_warn(dev->dev,
  			 "%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);
  	dvb_create_media_graph(&dvb->adapter);
  
  	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:
  	dvb_unregister_frontend(dvb->frontend);
  fail_frontend:
  	dvb_frontend_detach(dvb->frontend);
  	dvb_unregister_adapter(&dvb->adapter);
  fail_adapter:
  	return result;
  }
  
  static void unregister_dvb(struct cx231xx_dvb *dvb)
  {
  	struct i2c_client *client;
  	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);
  	client = dvb->i2c_client_tuner;
  	/* remove I2C tuner */
  	if (client) {
  		module_put(client->dev.driver->owner);
  		i2c_unregister_device(client);
  	}
  	dvb_unregister_frontend(dvb->frontend);
  	dvb_frontend_detach(dvb->frontend);
  	dvb_unregister_adapter(&dvb->adapter);
  }
  
  static int dvb_init(struct cx231xx *dev)
  {
  	int result = 0;
  	struct cx231xx_dvb *dvb;
  	struct i2c_adapter *tuner_i2c;
  	struct i2c_adapter *demod_i2c;
  
  	if (!dev->board.has_dvb) {
  		/* This device does not support the extension */
  		return 0;
  	}
  
  	dvb = kzalloc(sizeof(struct cx231xx_dvb), GFP_KERNEL);
  
  	if (dvb == NULL) {
  		dev_info(dev->dev,
  			 "cx231xx_dvb: memory allocation failed\n");
  		return -ENOMEM;
  	}
  	dev->dvb = dvb;
  	dev->cx231xx_set_analog_freq = cx231xx_set_analog_freq;
  	dev->cx231xx_reset_analog_tuner = cx231xx_reset_analog_tuner;
  
  	tuner_i2c = cx231xx_get_i2c_adap(dev, dev->board.tuner_i2c_master);
  	demod_i2c = cx231xx_get_i2c_adap(dev, dev->board.demod_i2c_master);
  	mutex_lock(&dev->lock);
  	cx231xx_set_mode(dev, CX231XX_DIGITAL_MODE);
  	cx231xx_demod_reset(dev);
  	/* init frontend */
  	switch (dev->model) {
  	case CX231XX_BOARD_CNXT_CARRAERA:
  	case CX231XX_BOARD_CNXT_RDE_250:
  
  		dev->dvb->frontend = dvb_attach(s5h1432_attach,
  					&dvico_s5h1432_config,
  					demod_i2c);
  
  		if (dev->dvb->frontend == NULL) {
  			dev_err(dev->dev,
  				"Failed to attach s5h1432 front end\n");
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* define general-purpose callback pointer */
  		dvb->frontend->callback = cx231xx_tuner_callback;
  
  		if (!dvb_attach(xc5000_attach, dev->dvb->frontend,
  			       tuner_i2c,
  			       &cnxt_rde250_tunerconfig)) {
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		break;
  	case CX231XX_BOARD_CNXT_SHELBY:
  	case CX231XX_BOARD_CNXT_RDU_250:
  
  		dev->dvb->frontend = dvb_attach(s5h1411_attach,
  					       &xc5000_s5h1411_config,
  					       demod_i2c);
  
  		if (dev->dvb->frontend == NULL) {
  			dev_err(dev->dev,
  				"Failed to attach s5h1411 front end\n");
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* define general-purpose callback pointer */
  		dvb->frontend->callback = cx231xx_tuner_callback;
  
  		if (!dvb_attach(xc5000_attach, dev->dvb->frontend,
  			       tuner_i2c,
  			       &cnxt_rdu250_tunerconfig)) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case CX231XX_BOARD_CNXT_RDE_253S:
  
  		dev->dvb->frontend = dvb_attach(s5h1432_attach,
  					&dvico_s5h1432_config,
  					demod_i2c);
  
  		if (dev->dvb->frontend == NULL) {
  			dev_err(dev->dev,
  				"Failed to attach s5h1432 front end\n");
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* define general-purpose callback pointer */
  		dvb->frontend->callback = cx231xx_tuner_callback;
  
  		if (!dvb_attach(tda18271_attach, dev->dvb->frontend,
  			       0x60, tuner_i2c,
  			       &cnxt_rde253s_tunerconfig)) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case CX231XX_BOARD_CNXT_RDU_253S:
  	case CX231XX_BOARD_KWORLD_UB445_USB_HYBRID:
  
  		dev->dvb->frontend = dvb_attach(s5h1411_attach,
  					       &tda18271_s5h1411_config,
  					       demod_i2c);
  
  		if (dev->dvb->frontend == NULL) {
  			dev_err(dev->dev,
  				"Failed to attach s5h1411 front end\n");
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* define general-purpose callback pointer */
  		dvb->frontend->callback = cx231xx_tuner_callback;
  
  		if (!dvb_attach(tda18271_attach, dev->dvb->frontend,
  			       0x60, tuner_i2c,
  			       &cnxt_rde253s_tunerconfig)) {
  			result = -EINVAL;
  			goto out_free;
  		}
  		break;
  	case CX231XX_BOARD_HAUPPAUGE_EXETER:
  
  		dev_info(dev->dev,
  			 "%s: looking for tuner / demod on i2c bus: %d\n",
  		       __func__, i2c_adapter_id(tuner_i2c));
  
  		dev->dvb->frontend = dvb_attach(lgdt3305_attach,
  						&hcw_lgdt3305_config,
  						tuner_i2c);
  
  		if (dev->dvb->frontend == NULL) {
  			dev_err(dev->dev,
  				"Failed to attach LG3305 front end\n");
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* define general-purpose callback pointer */
  		dvb->frontend->callback = cx231xx_tuner_callback;
  
  		dvb_attach(tda18271_attach, dev->dvb->frontend,
  			   0x60, tuner_i2c,
  			   &hcw_tda18271_config);
  		break;
  
  	case CX231XX_BOARD_HAUPPAUGE_930C_HD_1113xx:
  
  		dev->dvb->frontend = dvb_attach(si2165_attach,
  			&hauppauge_930C_HD_1113xx_si2165_config,
  			tuner_i2c
  			);
  
  		if (dev->dvb->frontend == NULL) {
  			dev_err(dev->dev,
  				"Failed to attach SI2165 front end\n");
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		dev->dvb->frontend->ops.i2c_gate_ctrl = NULL;
  
  		/* define general-purpose callback pointer */
  		dvb->frontend->callback = cx231xx_tuner_callback;
  
  		dvb_attach(tda18271_attach, dev->dvb->frontend,
  			0x60,
  			tuner_i2c,
  			&hcw_tda18271_config);
  
  		dev->cx231xx_reset_analog_tuner = NULL;
  		break;
  
  	case CX231XX_BOARD_HAUPPAUGE_930C_HD_1114xx:
  	{
  		struct i2c_client *client;
  		struct i2c_board_info info;
  		struct si2157_config si2157_config;
  
  		memset(&info, 0, sizeof(struct i2c_board_info));
  
  		dev->dvb->frontend = dvb_attach(si2165_attach,
  			&pctv_quatro_stick_1114xx_si2165_config,
  			tuner_i2c
  			);
  
  		if (dev->dvb->frontend == NULL) {
  			dev_err(dev->dev,
  				"Failed to attach SI2165 front end\n");
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		dev->dvb->frontend->ops.i2c_gate_ctrl = NULL;
  
  		/* define general-purpose callback pointer */
  		dvb->frontend->callback = cx231xx_tuner_callback;
  
  		/* attach tuner */
  		memset(&si2157_config, 0, sizeof(si2157_config));
  		si2157_config.fe = dev->dvb->frontend;
  		si2157_config.if_port = 1;
  		si2157_config.inversion = true;
  		strlcpy(info.type, "si2157", I2C_NAME_SIZE);
  		info.addr = 0x60;
  		info.platform_data = &si2157_config;
  		request_module("si2157");
  
  		client = i2c_new_device(
  			tuner_i2c,
  			&info);
  		if (client == NULL || client->dev.driver == NULL) {
  			dvb_frontend_detach(dev->dvb->frontend);
  			result = -ENODEV;
  			goto out_free;
  		}
  
  		if (!try_module_get(client->dev.driver->owner)) {
  			i2c_unregister_device(client);
  			dvb_frontend_detach(dev->dvb->frontend);
  			result = -ENODEV;
  			goto out_free;
  		}
  
  		dev->cx231xx_reset_analog_tuner = NULL;
  
  		dev->dvb->i2c_client_tuner = client;
  		break;
  	}
  	case CX231XX_BOARD_HAUPPAUGE_955Q:
  	{
  		struct i2c_client *client;
  		struct i2c_board_info info;
  		struct si2157_config si2157_config;
  
  		memset(&info, 0, sizeof(struct i2c_board_info));
  
  		dev->dvb->frontend = dvb_attach(lgdt3306a_attach,
  			&hauppauge_955q_lgdt3306a_config,
  			tuner_i2c
  			);
  
  		if (dev->dvb->frontend == NULL) {
  			dev_err(dev->dev,
  				"Failed to attach LGDT3306A frontend.\n");
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		dev->dvb->frontend->ops.i2c_gate_ctrl = NULL;
  
  		/* define general-purpose callback pointer */
  		dvb->frontend->callback = cx231xx_tuner_callback;
  
  		/* attach tuner */
  		memset(&si2157_config, 0, sizeof(si2157_config));
  		si2157_config.fe = dev->dvb->frontend;
  		si2157_config.if_port = 1;
  		si2157_config.inversion = true;
  		strlcpy(info.type, "si2157", I2C_NAME_SIZE);
  		info.addr = 0x60;
  		info.platform_data = &si2157_config;
  		request_module("si2157");
  
  		client = i2c_new_device(
  			tuner_i2c,
  			&info);
  		if (client == NULL || client->dev.driver == NULL) {
  			dvb_frontend_detach(dev->dvb->frontend);
  			result = -ENODEV;
  			goto out_free;
  		}
  
  		if (!try_module_get(client->dev.driver->owner)) {
  			i2c_unregister_device(client);
  			dvb_frontend_detach(dev->dvb->frontend);
  			result = -ENODEV;
  			goto out_free;
  		}
  
  		dev->cx231xx_reset_analog_tuner = NULL;
  
  		dev->dvb->i2c_client_tuner = client;
  		break;
  	}
  	case CX231XX_BOARD_PV_PLAYTV_USB_HYBRID:
  	case CX231XX_BOARD_KWORLD_UB430_USB_HYBRID:
  
  		dev_info(dev->dev,
  			 "%s: looking for demod on i2c bus: %d\n",
  			 __func__, i2c_adapter_id(tuner_i2c));
  
  		dev->dvb->frontend = dvb_attach(mb86a20s_attach,
  						&pv_mb86a20s_config,
  						demod_i2c);
  
  		if (dev->dvb->frontend == NULL) {
  			dev_err(dev->dev,
  				"Failed to attach mb86a20s demod\n");
  			result = -EINVAL;
  			goto out_free;
  		}
  
  		/* define general-purpose callback pointer */
  		dvb->frontend->callback = cx231xx_tuner_callback;
  
  		dvb_attach(tda18271_attach, dev->dvb->frontend,
  			   0x60, tuner_i2c,
  			   &pv_tda18271_config);
  		break;
  
  	default:
  		dev_err(dev->dev,
  			"%s/2: The frontend of your DVB/ATSC card isn't supported yet\n",
  			dev->name);
  		break;
  	}
  	if (NULL == dvb->frontend) {
  		dev_err(dev->dev,
  		       "%s/2: frontend initialization failed\n", dev->name);
  		result = -EINVAL;
  		goto out_free;
  	}
  
  	/* register everything */
  	result = register_dvb(dvb, THIS_MODULE, dev, dev->dev);
  
  	if (result < 0)
  		goto out_free;
  
  
  	dev_info(dev->dev, "Successfully loaded cx231xx-dvb\n");
  
  ret:
  	cx231xx_set_mode(dev, CX231XX_SUSPEND);
  	mutex_unlock(&dev->lock);
  	return result;
  
  out_free:
  	kfree(dvb);
  	dev->dvb = NULL;
  	goto ret;
  }
  
  static int dvb_fini(struct cx231xx *dev)
  {
  	if (!dev->board.has_dvb) {
  		/* This device does not support the extension */
  		return 0;
  	}
  
  	if (dev->dvb) {
  		unregister_dvb(dev->dvb);
  		dev->dvb = NULL;
  	}
  
  	return 0;
  }
  
  static struct cx231xx_ops dvb_ops = {
  	.id = CX231XX_DVB,
  	.name = "Cx231xx dvb Extension",
  	.init = dvb_init,
  	.fini = dvb_fini,
  };
  
  static int __init cx231xx_dvb_register(void)
  {
  	return cx231xx_register_extension(&dvb_ops);
  }
  
  static void __exit cx231xx_dvb_unregister(void)
  {
  	cx231xx_unregister_extension(&dvb_ops);
  }
  
  module_init(cx231xx_dvb_register);
  module_exit(cx231xx_dvb_unregister);
  