drivers/media/video/em28xx/em28xx-dvb.c - kernel/msm-5.4 - Gitiles

 /*
  DVB device driver for em28xx

  (c) 2008 Mauro Carvalho Chehab <mchehab@infradead.org>

  (c) 2008 Devin Heitmueller <devin.heitmueller@gmail.com>
 	- Fixes for the driver to properly work with HVR-950

  (c) 2008 Aidan Thornton <makosoft@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/usb.h>

 #include "em28xx.h"
 #include <media/v4l2-common.h>
 #include <media/videobuf-vmalloc.h>

 #include "lgdt330x.h"
 #include "zl10353.h"

 MODULE_DESCRIPTION("driver for em28xx based DVB cards");
 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
 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 dprintk(level, fmt, arg...) do {			\
 if (debug >= level) 						\
 	printk(KERN_DEBUG "%s/2-dvb: " fmt, dev->name, ## arg);	\
 } while (0)

 #define EM28XX_DVB_NUM_BUFS 5
 #define EM28XX_DVB_MAX_PACKETSIZE 564
 #define EM28XX_DVB_MAX_PACKETS 64

 struct em28xx_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;
 };


 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 dvb_isoc_copy(struct em28xx *dev, struct urb *urb)
 {
 	int i;

 	if (!dev)
 		return 0;

 	if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
 		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 int start_streaming(struct em28xx_dvb* dvb) {
 	struct em28xx *dev = dvb->adapter.priv;

 	usb_set_interface(dev->udev, 0, 1);
 	dev->em28xx_write_regs_req(dev,0x00,0x48,"\x00",1);

 	return em28xx_init_isoc(dev, EM28XX_DVB_MAX_PACKETS,
 				EM28XX_DVB_NUM_BUFS, EM28XX_DVB_MAX_PACKETSIZE,
 				dvb_isoc_copy, EM28XX_DIGITAL_CAPTURE);
 }

 static int stop_streaming(struct em28xx_dvb* dvb) {
 	struct em28xx *dev = dvb->adapter.priv;

 	em28xx_uninit_isoc(dev);
 	return 0;
 }

 static int 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 = 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 em28xx_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 struct lgdt330x_config em2880_lgdt3303_dev = {
 	.demod_address = 0x0e,
 	.demod_chip = LGDT3303,
 };

 static struct zl10353_config em28xx_zl10353_with_xc3028 = {
 	.demod_address = (0x1e >> 1),
 	.no_tuner = 1,
 	.parallel_ts = 1,
 	.if2 = 45600,
 };

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

 static int attach_xc3028(u8 addr, struct em28xx *dev)
 {
 	struct dvb_frontend *fe;
 	struct xc2028_ctrl ctl;
 	struct xc2028_config cfg;

 	memset (&cfg, 0, sizeof(cfg));
 	cfg.i2c_adap  = &dev->i2c_adap;
 	cfg.i2c_addr  = addr;
 	cfg.ctrl      = &ctl;
 	cfg.callback  = em28xx_tuner_callback;

 	em28xx_setup_xc3028(dev, &ctl);

 	if (!dev->dvb->frontend) {
 		printk(KERN_ERR "%s/2: dvb frontend not attached. "
 				"Can't attach xc3028\n",
 		       dev->name);
 		return -EINVAL;
 	}

 	fe = dvb_attach(xc2028_attach, dev->dvb->frontend, &cfg);
 	if (!fe) {
 		printk(KERN_ERR "%s/2: xc3028 attach failed\n",
 		       dev->name);
 		dvb_frontend_detach(dev->dvb->frontend);
 		dvb_unregister_frontend(dev->dvb->frontend);
 		dev->dvb->frontend = NULL;
 		return -EINVAL;
 	}

 	printk(KERN_INFO "%s/2: xc3028 attached\n", dev->name);

 	return 0;
 }

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

 int 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;
 	}
 	dvb->adapter.priv = dev;

 	/* register frontend */
 	result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
 	if (result < 0) {
 		printk(KERN_WARNING "%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) {
 		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:
 	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 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);
 	dvb_unregister_frontend(dvb->frontend);
 	dvb_frontend_detach(dvb->frontend);
 	dvb_unregister_adapter(&dvb->adapter);
 }


 static int dvb_init(struct em28xx *dev)
 {
 	int result = 0;
 	struct em28xx_dvb *dvb;

 	dvb = kzalloc(sizeof(struct em28xx_dvb), GFP_KERNEL);
 	if(dvb == NULL) {
 		printk("em28xx_dvb: memory allocation failed\n");
 		return -ENOMEM;
 	}
 	dev->dvb = dvb;

 	/* init frontend */
 	switch (dev->model) {
 	case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_950:
 		/* Enable lgdt330x */
 		dev->mode = EM28XX_DIGITAL_MODE;
 		em28xx_tuner_callback(dev, XC2028_TUNER_RESET, 0);

 		dvb->frontend = dvb_attach(lgdt330x_attach,
 					   &em2880_lgdt3303_dev,
 					   &dev->i2c_adap);
 		if (attach_xc3028(0x61, dev) < 0) {
 			result = -EINVAL;
 			goto out_free;
 		}
 		break;
 	case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900:
 		/* Enable zl10353 */
 		dev->mode = EM28XX_DIGITAL_MODE;
 		em28xx_tuner_callback(dev, XC2028_TUNER_RESET, 0);
 		dvb->frontend = dvb_attach(zl10353_attach,
 					   &em28xx_zl10353_with_xc3028,
 					   &dev->i2c_adap);
 		if (attach_xc3028(0x61, dev) < 0) {
 			result = -EINVAL;
 			goto out_free;
 		}
 		break;
 	default:
 		printk(KERN_ERR "%s/2: The frontend of your DVB/ATSC card"
 				" isn't supported yet\n",
 		       dev->name);
 		break;
 	}
 	if (NULL == dvb->frontend) {
 		printk(KERN_ERR
 		       "%s/2: frontend initialization failed\n",
 		       dev->name);
 		result = -EINVAL;
 		goto out_free;
 	}

 	/* register everything */
 	result = register_dvb(dvb, THIS_MODULE, dev, &dev->udev->dev);

 	if (result < 0) {
 		goto out_free;
 	}

 	return 0;

 out_free:
 	kfree(dvb);
 	dev->dvb = NULL;
 	return result;
 }

 static int dvb_fini(struct em28xx *dev)
 {
 	if (dev->dvb) {
 		unregister_dvb(dev->dvb);
 		dev->dvb = NULL;
 	}

 	return 0;
 }

 static struct em28xx_ops dvb_ops = {
 	.id   = EM28XX_DVB,
 	.name = "Em28xx dvb Extension",
 	.init = dvb_init,
 	.fini = dvb_fini,
 };

 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);
	/*
	DVB device driver for em28xx

	(c) 2008 Mauro Carvalho Chehab <mchehab@infradead.org>

	(c) 2008 Devin Heitmueller <devin.heitmueller@gmail.com>
	- Fixes for the driver to properly work with HVR-950

	(c) 2008 Aidan Thornton <makosoft@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/usb.h>

	#include "em28xx.h"
	#include <media/v4l2-common.h>
	#include <media/videobuf-vmalloc.h>

	#include "lgdt330x.h"
	#include "zl10353.h"

	MODULE_DESCRIPTION("driver for em28xx based DVB cards");
	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
	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 dprintk(level, fmt, arg...) do { \
	if (debug >= level) \
	printk(KERN_DEBUG "%s/2-dvb: " fmt, dev->name, ## arg); \
	} while (0)

	#define EM28XX_DVB_NUM_BUFS 5
	#define EM28XX_DVB_MAX_PACKETSIZE 564
	#define EM28XX_DVB_MAX_PACKETS 64

	struct em28xx_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;
	};


	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 dvb_isoc_copy(struct em28xx dev, struct urb urb)
	{
	int i;

	if (!dev)
	return 0;

	if ((dev->state & DEV_DISCONNECTED) \|\| (dev->state & DEV_MISCONFIGURED))
	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 int start_streaming(struct em28xx_dvb* dvb) {
	struct em28xx *dev = dvb->adapter.priv;

	usb_set_interface(dev->udev, 0, 1);
	dev->em28xx_write_regs_req(dev,0x00,0x48,"\x00",1);

	return em28xx_init_isoc(dev, EM28XX_DVB_MAX_PACKETS,
	EM28XX_DVB_NUM_BUFS, EM28XX_DVB_MAX_PACKETSIZE,
	dvb_isoc_copy, EM28XX_DIGITAL_CAPTURE);
	}

	static int stop_streaming(struct em28xx_dvb* dvb) {
	struct em28xx *dev = dvb->adapter.priv;

	em28xx_uninit_isoc(dev);
	return 0;
	}

	static int 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 = 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 em28xx_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 struct lgdt330x_config em2880_lgdt3303_dev = {
	.demod_address = 0x0e,
	.demod_chip = LGDT3303,
	};

	static struct zl10353_config em28xx_zl10353_with_xc3028 = {
	.demod_address = (0x1e >> 1),
	.no_tuner = 1,
	.parallel_ts = 1,
	.if2 = 45600,
	};

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

	static int attach_xc3028(u8 addr, struct em28xx *dev)
	{
	struct dvb_frontend *fe;
	struct xc2028_ctrl ctl;
	struct xc2028_config cfg;

	memset (&cfg, 0, sizeof(cfg));
	cfg.i2c_adap = &dev->i2c_adap;
	cfg.i2c_addr = addr;
	cfg.ctrl = &ctl;
	cfg.callback = em28xx_tuner_callback;

	em28xx_setup_xc3028(dev, &ctl);

	if (!dev->dvb->frontend) {
	printk(KERN_ERR "%s/2: dvb frontend not attached. "
	"Can't attach xc3028\n",
	dev->name);
	return -EINVAL;
	}

	fe = dvb_attach(xc2028_attach, dev->dvb->frontend, &cfg);
	if (!fe) {
	printk(KERN_ERR "%s/2: xc3028 attach failed\n",
	dev->name);
	dvb_frontend_detach(dev->dvb->frontend);
	dvb_unregister_frontend(dev->dvb->frontend);
	dev->dvb->frontend = NULL;
	return -EINVAL;
	}

	printk(KERN_INFO "%s/2: xc3028 attached\n", dev->name);

	return 0;
	}

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

	int 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;
	}
	dvb->adapter.priv = dev;

	/* register frontend */
	result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
	if (result < 0) {
	printk(KERN_WARNING "%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) {
	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:
	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 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);
	dvb_unregister_frontend(dvb->frontend);
	dvb_frontend_detach(dvb->frontend);
	dvb_unregister_adapter(&dvb->adapter);
	}


	static int dvb_init(struct em28xx *dev)
	{
	int result = 0;
	struct em28xx_dvb *dvb;

	dvb = kzalloc(sizeof(struct em28xx_dvb), GFP_KERNEL);
	if(dvb == NULL) {
	printk("em28xx_dvb: memory allocation failed\n");
	return -ENOMEM;
	}
	dev->dvb = dvb;

	/* init frontend */
	switch (dev->model) {
	case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_950:
	/* Enable lgdt330x */
	dev->mode = EM28XX_DIGITAL_MODE;
	em28xx_tuner_callback(dev, XC2028_TUNER_RESET, 0);

	dvb->frontend = dvb_attach(lgdt330x_attach,
	&em2880_lgdt3303_dev,
	&dev->i2c_adap);
	if (attach_xc3028(0x61, dev) < 0) {
	result = -EINVAL;
	goto out_free;
	}
	break;
	case EM2880_BOARD_HAUPPAUGE_WINTV_HVR_900:
	/* Enable zl10353 */
	dev->mode = EM28XX_DIGITAL_MODE;
	em28xx_tuner_callback(dev, XC2028_TUNER_RESET, 0);
	dvb->frontend = dvb_attach(zl10353_attach,
	&em28xx_zl10353_with_xc3028,
	&dev->i2c_adap);
	if (attach_xc3028(0x61, dev) < 0) {
	result = -EINVAL;
	goto out_free;
	}
	break;
	default:
	printk(KERN_ERR "%s/2: The frontend of your DVB/ATSC card"
	" isn't supported yet\n",
	dev->name);
	break;
	}
	if (NULL == dvb->frontend) {
	printk(KERN_ERR
	"%s/2: frontend initialization failed\n",
	dev->name);
	result = -EINVAL;
	goto out_free;
	}

	/* register everything */
	result = register_dvb(dvb, THIS_MODULE, dev, &dev->udev->dev);

	if (result < 0) {
	goto out_free;
	}

	return 0;

	out_free:
	kfree(dvb);
	dev->dvb = NULL;
	return result;
	}

	static int dvb_fini(struct em28xx *dev)
	{
	if (dev->dvb) {
	unregister_dvb(dev->dvb);
	dev->dvb = NULL;
	}

	return 0;
	}

	static struct em28xx_ops dvb_ops = {
	.id = EM28XX_DVB,
	.name = "Em28xx dvb Extension",
	.init = dvb_init,
	.fini = dvb_fini,
	};

	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);