drivers/media/video/hdpvr/hdpvr-core.c - maze/linux - Git at Google

 /*
  * Hauppauge HD PVR USB driver
  *
  * Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
  * Copyright (C) 2008      Janne Grunau (j@jannau.net)
  * Copyright (C) 2008      John Poet
  *
  *	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, version 2.
  *
  */

 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/uaccess.h>
 #include <linux/atomic.h>
 #include <linux/usb.h>
 #include <linux/mutex.h>
 #include <linux/i2c.h>

 #include <linux/videodev2.h>
 #include <media/v4l2-dev.h>
 #include <media/v4l2-common.h>

 #include "hdpvr.h"

 static int video_nr[HDPVR_MAX] = {[0 ... (HDPVR_MAX - 1)] = UNSET};
 module_param_array(video_nr, int, NULL, 0);
 MODULE_PARM_DESC(video_nr, "video device number (-1=Auto)");

 /* holds the number of currently registered devices */
 static atomic_t dev_nr = ATOMIC_INIT(-1);

 int hdpvr_debug;
 module_param(hdpvr_debug, int, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(hdpvr_debug, "enable debugging output");

 static uint default_video_input = HDPVR_VIDEO_INPUTS;
 module_param(default_video_input, uint, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(default_video_input, "default video input: 0=Component / "
 		 "1=S-Video / 2=Composite");

 static uint default_audio_input = HDPVR_AUDIO_INPUTS;
 module_param(default_audio_input, uint, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(default_audio_input, "default audio input: 0=RCA back / "
 		 "1=RCA front / 2=S/PDIF");

 static bool boost_audio;
 module_param(boost_audio, bool, S_IRUGO|S_IWUSR);
 MODULE_PARM_DESC(boost_audio, "boost the audio signal");


 /* table of devices that work with this driver */
 static struct usb_device_id hdpvr_table[] = {
 	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID) },
 	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID1) },
 	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID2) },
 	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID3) },
 	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID4) },
 	{ }					/* Terminating entry */
 };
 MODULE_DEVICE_TABLE(usb, hdpvr_table);


 void hdpvr_delete(struct hdpvr_device *dev)
 {
 	hdpvr_free_buffers(dev);

 	if (dev->video_dev)
 		video_device_release(dev->video_dev);

 	usb_put_dev(dev->udev);
 }

 static void challenge(u8 *bytes)
 {
 	u64 *i64P, tmp64;
 	uint i, idx;

 	for (idx = 0; idx < 32; ++idx) {

 		if (idx & 0x3)
 			bytes[(idx >> 3) + 3] = bytes[(idx >> 2) & 0x3];

 		switch (idx & 0x3) {
 		case 0x3:
 			bytes[2] += bytes[3] * 4 + bytes[4] + bytes[5];
 			bytes[4] += bytes[(idx & 0x1) * 2] * 9 + 9;
 			break;
 		case 0x1:
 			bytes[0] *= 8;
 			bytes[0] += 7*idx + 4;
 			bytes[6] += bytes[3] * 3;
 			break;
 		case 0x0:
 			bytes[3 - (idx >> 3)] = bytes[idx >> 2];
 			bytes[5] += bytes[6] * 3;
 			for (i = 0; i < 3; i++)
 				bytes[3] *= bytes[3] + 1;
 			break;
 		case 0x2:
 			for (i = 0; i < 3; i++)
 				bytes[1] *= bytes[6] + 1;
 			for (i = 0; i < 3; i++) {
 				i64P = (u64 *)bytes;
 				tmp64 = le64_to_cpup(i64P);
 				tmp64 <<= bytes[7] & 0x0f;
 				*i64P += cpu_to_le64(tmp64);
 			}
 			break;
 		}
 	}
 }

 /* try to init the device like the windows driver */
 static int device_authorization(struct hdpvr_device *dev)
 {

 	int ret, retval = -ENOMEM;
 	char request_type = 0x38, rcv_request = 0x81;
 	char *response;
 #ifdef HDPVR_DEBUG
 	size_t buf_size = 46;
 	char *print_buf = kzalloc(5*buf_size+1, GFP_KERNEL);
 	if (!print_buf) {
 		v4l2_err(&dev->v4l2_dev, "Out of memory\n");
 		return retval;
 	}
 #endif

 	mutex_lock(&dev->usbc_mutex);
 	ret = usb_control_msg(dev->udev,
 			      usb_rcvctrlpipe(dev->udev, 0),
 			      rcv_request, 0x80 | request_type,
 			      0x0400, 0x0003,
 			      dev->usbc_buf, 46,
 			      10000);
 	if (ret != 46) {
 		v4l2_err(&dev->v4l2_dev,
 			 "unexpected answer of status request, len %d\n", ret);
 		goto unlock;
 	}
 #ifdef HDPVR_DEBUG
 	else {
 		hex_dump_to_buffer(dev->usbc_buf, 46, 16, 1, print_buf,
 				   5*buf_size+1, 0);
 		v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 			 "Status request returned, len %d: %s\n",
 			 ret, print_buf);
 	}
 #endif

 	v4l2_info(&dev->v4l2_dev, "firmware version 0x%x dated %s\n",
 			  dev->usbc_buf[1], &dev->usbc_buf[2]);

 	switch (dev->usbc_buf[1]) {
 	case HDPVR_FIRMWARE_VERSION:
 		dev->flags &= ~HDPVR_FLAG_AC3_CAP;
 		break;
 	case HDPVR_FIRMWARE_VERSION_AC3:
 	case HDPVR_FIRMWARE_VERSION_0X12:
 	case HDPVR_FIRMWARE_VERSION_0X15:
 		dev->flags |= HDPVR_FLAG_AC3_CAP;
 		break;
 	default:
 		v4l2_info(&dev->v4l2_dev, "untested firmware, the driver might"
 			  " not work.\n");
 		if (dev->usbc_buf[1] >= HDPVR_FIRMWARE_VERSION_AC3)
 			dev->flags |= HDPVR_FLAG_AC3_CAP;
 		else
 			dev->flags &= ~HDPVR_FLAG_AC3_CAP;
 	}

 	response = dev->usbc_buf+38;
 #ifdef HDPVR_DEBUG
 	hex_dump_to_buffer(response, 8, 16, 1, print_buf, 5*buf_size+1, 0);
 	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev, "challenge: %s\n",
 		 print_buf);
 #endif
 	challenge(response);
 #ifdef HDPVR_DEBUG
 	hex_dump_to_buffer(response, 8, 16, 1, print_buf, 5*buf_size+1, 0);
 	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev, " response: %s\n",
 		 print_buf);
 #endif

 	msleep(100);
 	ret = usb_control_msg(dev->udev,
 			      usb_sndctrlpipe(dev->udev, 0),
 			      0xd1, 0x00 | request_type,
 			      0x0000, 0x0000,
 			      response, 8,
 			      10000);
 	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 		 "magic request returned %d\n", ret);

 	retval = ret != 8;
 unlock:
 	mutex_unlock(&dev->usbc_mutex);
 	return retval;
 }

 static int hdpvr_device_init(struct hdpvr_device *dev)
 {
 	int ret;
 	u8 *buf;
 	struct hdpvr_video_info *vidinf;

 	if (device_authorization(dev))
 		return -EACCES;

 	/* default options for init */
 	hdpvr_set_options(dev);

 	/* set filter options */
 	mutex_lock(&dev->usbc_mutex);
 	buf = dev->usbc_buf;
 	buf[0] = 0x03; buf[1] = 0x03; buf[2] = 0x00; buf[3] = 0x00;
 	ret = usb_control_msg(dev->udev,
 			      usb_sndctrlpipe(dev->udev, 0),
 			      0x01, 0x38,
 			      CTRL_LOW_PASS_FILTER_VALUE, CTRL_DEFAULT_INDEX,
 			      buf, 4,
 			      1000);
 	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 		 "control request returned %d\n", ret);
 	mutex_unlock(&dev->usbc_mutex);

 	vidinf = get_video_info(dev);
 	if (!vidinf)
 		v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 			"no valid video signal or device init failed\n");
 	else
 		kfree(vidinf);

 	/* enable fan and bling leds */
 	mutex_lock(&dev->usbc_mutex);
 	buf[0] = 0x1;
 	ret = usb_control_msg(dev->udev,
 			      usb_sndctrlpipe(dev->udev, 0),
 			      0xd4, 0x38, 0, 0, buf, 1,
 			      1000);
 	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 		 "control request returned %d\n", ret);

 	/* boost analog audio */
 	buf[0] = boost_audio;
 	ret = usb_control_msg(dev->udev,
 			      usb_sndctrlpipe(dev->udev, 0),
 			      0xd5, 0x38, 0, 0, buf, 1,
 			      1000);
 	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
 		 "control request returned %d\n", ret);
 	mutex_unlock(&dev->usbc_mutex);

 	dev->status = STATUS_IDLE;
 	return 0;
 }

 static const struct hdpvr_options hdpvr_default_options = {
 	.video_std	= HDPVR_60HZ,
 	.video_input	= HDPVR_COMPONENT,
 	.audio_input	= HDPVR_RCA_BACK,
 	.bitrate	= 65, /* 6 mbps */
 	.peak_bitrate	= 90, /* 9 mbps */
 	.bitrate_mode	= HDPVR_CONSTANT,
 	.gop_mode	= HDPVR_SIMPLE_IDR_GOP,
 	.audio_codec	= V4L2_MPEG_AUDIO_ENCODING_AAC,
 	.brightness	= 0x86,
 	.contrast	= 0x80,
 	.hue		= 0x80,
 	.saturation	= 0x80,
 	.sharpness	= 0x80,
 };

 static int hdpvr_probe(struct usb_interface *interface,
 		       const struct usb_device_id *id)
 {
 	struct hdpvr_device *dev;
 	struct usb_host_interface *iface_desc;
 	struct usb_endpoint_descriptor *endpoint;
 	struct i2c_client *client;
 	size_t buffer_size;
 	int i;
 	int retval = -ENOMEM;

 	/* allocate memory for our device state and initialize it */
 	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 	if (!dev) {
 		err("Out of memory");
 		goto error;
 	}

 	dev->workqueue = 0;

 	/* register v4l2_device early so it can be used for printks */
 	if (v4l2_device_register(&interface->dev, &dev->v4l2_dev)) {
 		err("v4l2_device_register failed");
 		goto error;
 	}

 	mutex_init(&dev->io_mutex);
 	mutex_init(&dev->i2c_mutex);
 	mutex_init(&dev->usbc_mutex);
 	dev->usbc_buf = kmalloc(64, GFP_KERNEL);
 	if (!dev->usbc_buf) {
 		v4l2_err(&dev->v4l2_dev, "Out of memory\n");
 		goto error;
 	}

 	init_waitqueue_head(&dev->wait_buffer);
 	init_waitqueue_head(&dev->wait_data);

 	dev->workqueue = create_singlethread_workqueue("hdpvr_buffer");
 	if (!dev->workqueue)
 		goto error;

 	/* init video transfer queues */
 	INIT_LIST_HEAD(&dev->free_buff_list);
 	INIT_LIST_HEAD(&dev->rec_buff_list);

 	dev->options = hdpvr_default_options;

 	if (default_video_input < HDPVR_VIDEO_INPUTS)
 		dev->options.video_input = default_video_input;

 	if (default_audio_input < HDPVR_AUDIO_INPUTS) {
 		dev->options.audio_input = default_audio_input;
 		if (default_audio_input == HDPVR_SPDIF)
 			dev->options.audio_codec =
 				V4L2_MPEG_AUDIO_ENCODING_AC3;
 	}

 	dev->udev = usb_get_dev(interface_to_usbdev(interface));

 	/* set up the endpoint information */
 	/* use only the first bulk-in and bulk-out endpoints */
 	iface_desc = interface->cur_altsetting;
 	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 		endpoint = &iface_desc->endpoint[i].desc;

 		if (!dev->bulk_in_endpointAddr &&
 		    usb_endpoint_is_bulk_in(endpoint)) {
 			/* USB interface description is buggy, reported max
 			 * packet size is 512 bytes, windows driver uses 8192 */
 			buffer_size = 8192;
 			dev->bulk_in_size = buffer_size;
 			dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
 		}

 	}
 	if (!dev->bulk_in_endpointAddr) {
 		v4l2_err(&dev->v4l2_dev, "Could not find bulk-in endpoint\n");
 		goto error;
 	}

 	/* init the device */
 	if (hdpvr_device_init(dev)) {
 		v4l2_err(&dev->v4l2_dev, "device init failed\n");
 		goto error;
 	}

 	mutex_lock(&dev->io_mutex);
 	if (hdpvr_alloc_buffers(dev, NUM_BUFFERS)) {
 		mutex_unlock(&dev->io_mutex);
 		v4l2_err(&dev->v4l2_dev,
 			 "allocating transfer buffers failed\n");
 		goto error;
 	}
 	mutex_unlock(&dev->io_mutex);

 	if (hdpvr_register_videodev(dev, &interface->dev,
 				    video_nr[atomic_inc_return(&dev_nr)])) {
 		v4l2_err(&dev->v4l2_dev, "registering videodev failed\n");
 		goto error;
 	}

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	retval = hdpvr_register_i2c_adapter(dev);
 	if (retval < 0) {
 		v4l2_err(&dev->v4l2_dev, "i2c adapter register failed\n");
 		goto error;
 	}

 	client = hdpvr_register_ir_rx_i2c(dev);
 	if (!client) {
 		v4l2_err(&dev->v4l2_dev, "i2c IR RX device register failed\n");
 		goto reg_fail;
 	}

 	client = hdpvr_register_ir_tx_i2c(dev);
 	if (!client) {
 		v4l2_err(&dev->v4l2_dev, "i2c IR TX device register failed\n");
 		goto reg_fail;
 	}
 #endif

 	/* let the user know what node this device is now attached to */
 	v4l2_info(&dev->v4l2_dev, "device now attached to %s\n",
 		  video_device_node_name(dev->video_dev));
 	return 0;

 reg_fail:
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	i2c_del_adapter(&dev->i2c_adapter);
 #endif
 error:
 	if (dev) {
 		/* Destroy single thread */
 		if (dev->workqueue)
 			destroy_workqueue(dev->workqueue);
 		/* this frees allocated memory */
 		hdpvr_delete(dev);
 	}
 	return retval;
 }

 static void hdpvr_disconnect(struct usb_interface *interface)
 {
 	struct hdpvr_device *dev = to_hdpvr_dev(usb_get_intfdata(interface));

 	v4l2_info(&dev->v4l2_dev, "device %s disconnected\n",
 		  video_device_node_name(dev->video_dev));
 	/* prevent more I/O from starting and stop any ongoing */
 	mutex_lock(&dev->io_mutex);
 	dev->status = STATUS_DISCONNECTED;
 	wake_up_interruptible(&dev->wait_data);
 	wake_up_interruptible(&dev->wait_buffer);
 	mutex_unlock(&dev->io_mutex);
 	v4l2_device_disconnect(&dev->v4l2_dev);
 	msleep(100);
 	flush_workqueue(dev->workqueue);
 	mutex_lock(&dev->io_mutex);
 	hdpvr_cancel_queue(dev);
 	mutex_unlock(&dev->io_mutex);
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	i2c_del_adapter(&dev->i2c_adapter);
 #endif
 	video_unregister_device(dev->video_dev);
 	atomic_dec(&dev_nr);
 }


 static struct usb_driver hdpvr_usb_driver = {
 	.name =		"hdpvr",
 	.probe =	hdpvr_probe,
 	.disconnect =	hdpvr_disconnect,
 	.id_table =	hdpvr_table,
 };

 module_usb_driver(hdpvr_usb_driver);

 MODULE_LICENSE("GPL");
 MODULE_VERSION("0.2.1");
 MODULE_AUTHOR("Janne Grunau");
 MODULE_DESCRIPTION("Hauppauge HD PVR driver");
	/*
	* Hauppauge HD PVR USB driver
	*
	* Copyright (C) 2001-2004 Greg Kroah-Hartman (greg@kroah.com)
	* Copyright (C) 2008 Janne Grunau (j@jannau.net)
	* Copyright (C) 2008 John Poet
	*
	* 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, version 2.
	*
	*/

	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/module.h>
	#include <linux/uaccess.h>
	#include <linux/atomic.h>
	#include <linux/usb.h>
	#include <linux/mutex.h>
	#include <linux/i2c.h>

	#include <linux/videodev2.h>
	#include <media/v4l2-dev.h>
	#include <media/v4l2-common.h>

	#include "hdpvr.h"

	static int video_nr[HDPVR_MAX] = {[0 ... (HDPVR_MAX - 1)] = UNSET};
	module_param_array(video_nr, int, NULL, 0);
	MODULE_PARM_DESC(video_nr, "video device number (-1=Auto)");

	/* holds the number of currently registered devices */
	static atomic_t dev_nr = ATOMIC_INIT(-1);

	int hdpvr_debug;
	module_param(hdpvr_debug, int, S_IRUGO\|S_IWUSR);
	MODULE_PARM_DESC(hdpvr_debug, "enable debugging output");

	static uint default_video_input = HDPVR_VIDEO_INPUTS;
	module_param(default_video_input, uint, S_IRUGO\|S_IWUSR);
	MODULE_PARM_DESC(default_video_input, "default video input: 0=Component / "
	"1=S-Video / 2=Composite");

	static uint default_audio_input = HDPVR_AUDIO_INPUTS;
	module_param(default_audio_input, uint, S_IRUGO\|S_IWUSR);
	MODULE_PARM_DESC(default_audio_input, "default audio input: 0=RCA back / "
	"1=RCA front / 2=S/PDIF");

	static bool boost_audio;
	module_param(boost_audio, bool, S_IRUGO\|S_IWUSR);
	MODULE_PARM_DESC(boost_audio, "boost the audio signal");


	/* table of devices that work with this driver */
	static struct usb_device_id hdpvr_table[] = {
	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID) },
	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID1) },
	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID2) },
	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID3) },
	{ USB_DEVICE(HD_PVR_VENDOR_ID, HD_PVR_PRODUCT_ID4) },
	{ } /* Terminating entry */
	};
	MODULE_DEVICE_TABLE(usb, hdpvr_table);


	void hdpvr_delete(struct hdpvr_device *dev)
	{
	hdpvr_free_buffers(dev);

	if (dev->video_dev)
	video_device_release(dev->video_dev);

	usb_put_dev(dev->udev);
	}

	static void challenge(u8 *bytes)
	{
	u64 *i64P, tmp64;
	uint i, idx;

	for (idx = 0; idx < 32; ++idx) {

	if (idx & 0x3)
	bytes[(idx >> 3) + 3] = bytes[(idx >> 2) & 0x3];

	switch (idx & 0x3) {
	case 0x3:
	bytes[2] += bytes[3] * 4 + bytes[4] + bytes[5];
	bytes[4] += bytes[(idx & 0x1) * 2] * 9 + 9;
	break;
	case 0x1:
	bytes[0] *= 8;
	bytes[0] += 7*idx + 4;
	bytes[6] += bytes[3] * 3;
	break;
	case 0x0:
	bytes[3 - (idx >> 3)] = bytes[idx >> 2];
	bytes[5] += bytes[6] * 3;
	for (i = 0; i < 3; i++)
	bytes[3] *= bytes[3] + 1;
	break;
	case 0x2:
	for (i = 0; i < 3; i++)
	bytes[1] *= bytes[6] + 1;
	for (i = 0; i < 3; i++) {
	i64P = (u64 *)bytes;
	tmp64 = le64_to_cpup(i64P);
	tmp64 <<= bytes[7] & 0x0f;
	*i64P += cpu_to_le64(tmp64);
	}
	break;
	}
	}
	}

	/* try to init the device like the windows driver */
	static int device_authorization(struct hdpvr_device *dev)
	{

	int ret, retval = -ENOMEM;
	char request_type = 0x38, rcv_request = 0x81;
	char *response;
	#ifdef HDPVR_DEBUG
	size_t buf_size = 46;
	char print_buf = kzalloc(5buf_size+1, GFP_KERNEL);
	if (!print_buf) {
	v4l2_err(&dev->v4l2_dev, "Out of memory\n");
	return retval;
	}
	#endif

	mutex_lock(&dev->usbc_mutex);
	ret = usb_control_msg(dev->udev,
	usb_rcvctrlpipe(dev->udev, 0),
	rcv_request, 0x80 \| request_type,
	0x0400, 0x0003,
	dev->usbc_buf, 46,
	10000);
	if (ret != 46) {
	v4l2_err(&dev->v4l2_dev,
	"unexpected answer of status request, len %d\n", ret);
	goto unlock;
	}
	#ifdef HDPVR_DEBUG
	else {
	hex_dump_to_buffer(dev->usbc_buf, 46, 16, 1, print_buf,
	5*buf_size+1, 0);
	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
	"Status request returned, len %d: %s\n",
	ret, print_buf);
	}
	#endif

	v4l2_info(&dev->v4l2_dev, "firmware version 0x%x dated %s\n",
	dev->usbc_buf[1], &dev->usbc_buf[2]);

	switch (dev->usbc_buf[1]) {
	case HDPVR_FIRMWARE_VERSION:
	dev->flags &= ~HDPVR_FLAG_AC3_CAP;
	break;
	case HDPVR_FIRMWARE_VERSION_AC3:
	case HDPVR_FIRMWARE_VERSION_0X12:
	case HDPVR_FIRMWARE_VERSION_0X15:
	dev->flags \|= HDPVR_FLAG_AC3_CAP;
	break;
	default:
	v4l2_info(&dev->v4l2_dev, "untested firmware, the driver might"
	" not work.\n");
	if (dev->usbc_buf[1] >= HDPVR_FIRMWARE_VERSION_AC3)
	dev->flags \|= HDPVR_FLAG_AC3_CAP;
	else
	dev->flags &= ~HDPVR_FLAG_AC3_CAP;
	}

	response = dev->usbc_buf+38;
	#ifdef HDPVR_DEBUG
	hex_dump_to_buffer(response, 8, 16, 1, print_buf, 5*buf_size+1, 0);
	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev, "challenge: %s\n",
	print_buf);
	#endif
	challenge(response);
	#ifdef HDPVR_DEBUG
	hex_dump_to_buffer(response, 8, 16, 1, print_buf, 5*buf_size+1, 0);
	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev, " response: %s\n",
	print_buf);
	#endif

	msleep(100);
	ret = usb_control_msg(dev->udev,
	usb_sndctrlpipe(dev->udev, 0),
	0xd1, 0x00 \| request_type,
	0x0000, 0x0000,
	response, 8,
	10000);
	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
	"magic request returned %d\n", ret);

	retval = ret != 8;
	unlock:
	mutex_unlock(&dev->usbc_mutex);
	return retval;
	}

	static int hdpvr_device_init(struct hdpvr_device *dev)
	{
	int ret;
	u8 *buf;
	struct hdpvr_video_info *vidinf;

	if (device_authorization(dev))
	return -EACCES;

	/* default options for init */
	hdpvr_set_options(dev);

	/* set filter options */
	mutex_lock(&dev->usbc_mutex);
	buf = dev->usbc_buf;
	buf[0] = 0x03; buf[1] = 0x03; buf[2] = 0x00; buf[3] = 0x00;
	ret = usb_control_msg(dev->udev,
	usb_sndctrlpipe(dev->udev, 0),
	0x01, 0x38,
	CTRL_LOW_PASS_FILTER_VALUE, CTRL_DEFAULT_INDEX,
	buf, 4,
	1000);
	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
	"control request returned %d\n", ret);
	mutex_unlock(&dev->usbc_mutex);

	vidinf = get_video_info(dev);
	if (!vidinf)
	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
	"no valid video signal or device init failed\n");
	else
	kfree(vidinf);

	/* enable fan and bling leds */
	mutex_lock(&dev->usbc_mutex);
	buf[0] = 0x1;
	ret = usb_control_msg(dev->udev,
	usb_sndctrlpipe(dev->udev, 0),
	0xd4, 0x38, 0, 0, buf, 1,
	1000);
	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
	"control request returned %d\n", ret);

	/* boost analog audio */
	buf[0] = boost_audio;
	ret = usb_control_msg(dev->udev,
	usb_sndctrlpipe(dev->udev, 0),
	0xd5, 0x38, 0, 0, buf, 1,
	1000);
	v4l2_dbg(MSG_INFO, hdpvr_debug, &dev->v4l2_dev,
	"control request returned %d\n", ret);
	mutex_unlock(&dev->usbc_mutex);

	dev->status = STATUS_IDLE;
	return 0;
	}

	static const struct hdpvr_options hdpvr_default_options = {
	.video_std = HDPVR_60HZ,
	.video_input = HDPVR_COMPONENT,
	.audio_input = HDPVR_RCA_BACK,
	.bitrate = 65, /* 6 mbps */
	.peak_bitrate = 90, /* 9 mbps */
	.bitrate_mode = HDPVR_CONSTANT,
	.gop_mode = HDPVR_SIMPLE_IDR_GOP,
	.audio_codec = V4L2_MPEG_AUDIO_ENCODING_AAC,
	.brightness = 0x86,
	.contrast = 0x80,
	.hue = 0x80,
	.saturation = 0x80,
	.sharpness = 0x80,
	};

	static int hdpvr_probe(struct usb_interface *interface,
	const struct usb_device_id *id)
	{
	struct hdpvr_device *dev;
	struct usb_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	struct i2c_client *client;
	size_t buffer_size;
	int i;
	int retval = -ENOMEM;

	/* allocate memory for our device state and initialize it */
	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev) {
	err("Out of memory");
	goto error;
	}

	dev->workqueue = 0;

	/* register v4l2_device early so it can be used for printks */
	if (v4l2_device_register(&interface->dev, &dev->v4l2_dev)) {
	err("v4l2_device_register failed");
	goto error;
	}

	mutex_init(&dev->io_mutex);
	mutex_init(&dev->i2c_mutex);
	mutex_init(&dev->usbc_mutex);
	dev->usbc_buf = kmalloc(64, GFP_KERNEL);
	if (!dev->usbc_buf) {
	v4l2_err(&dev->v4l2_dev, "Out of memory\n");
	goto error;
	}

	init_waitqueue_head(&dev->wait_buffer);
	init_waitqueue_head(&dev->wait_data);

	dev->workqueue = create_singlethread_workqueue("hdpvr_buffer");
	if (!dev->workqueue)
	goto error;

	/* init video transfer queues */
	INIT_LIST_HEAD(&dev->free_buff_list);
	INIT_LIST_HEAD(&dev->rec_buff_list);

	dev->options = hdpvr_default_options;

	if (default_video_input < HDPVR_VIDEO_INPUTS)
	dev->options.video_input = default_video_input;

	if (default_audio_input < HDPVR_AUDIO_INPUTS) {
	dev->options.audio_input = default_audio_input;
	if (default_audio_input == HDPVR_SPDIF)
	dev->options.audio_codec =
	V4L2_MPEG_AUDIO_ENCODING_AC3;
	}

	dev->udev = usb_get_dev(interface_to_usbdev(interface));

	/* set up the endpoint information */
	/* use only the first bulk-in and bulk-out endpoints */
	iface_desc = interface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
	endpoint = &iface_desc->endpoint[i].desc;

	if (!dev->bulk_in_endpointAddr &&
	usb_endpoint_is_bulk_in(endpoint)) {
	/* USB interface description is buggy, reported max
	* packet size is 512 bytes, windows driver uses 8192 */
	buffer_size = 8192;
	dev->bulk_in_size = buffer_size;
	dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
	}

	}
	if (!dev->bulk_in_endpointAddr) {
	v4l2_err(&dev->v4l2_dev, "Could not find bulk-in endpoint\n");
	goto error;
	}

	/* init the device */
	if (hdpvr_device_init(dev)) {
	v4l2_err(&dev->v4l2_dev, "device init failed\n");
	goto error;
	}

	mutex_lock(&dev->io_mutex);
	if (hdpvr_alloc_buffers(dev, NUM_BUFFERS)) {
	mutex_unlock(&dev->io_mutex);
	v4l2_err(&dev->v4l2_dev,
	"allocating transfer buffers failed\n");
	goto error;
	}
	mutex_unlock(&dev->io_mutex);

	if (hdpvr_register_videodev(dev, &interface->dev,
	video_nr[atomic_inc_return(&dev_nr)])) {
	v4l2_err(&dev->v4l2_dev, "registering videodev failed\n");
	goto error;
	}

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	retval = hdpvr_register_i2c_adapter(dev);
	if (retval < 0) {
	v4l2_err(&dev->v4l2_dev, "i2c adapter register failed\n");
	goto error;
	}

	client = hdpvr_register_ir_rx_i2c(dev);
	if (!client) {
	v4l2_err(&dev->v4l2_dev, "i2c IR RX device register failed\n");
	goto reg_fail;
	}

	client = hdpvr_register_ir_tx_i2c(dev);
	if (!client) {
	v4l2_err(&dev->v4l2_dev, "i2c IR TX device register failed\n");
	goto reg_fail;
	}
	#endif

	/* let the user know what node this device is now attached to */
	v4l2_info(&dev->v4l2_dev, "device now attached to %s\n",
	video_device_node_name(dev->video_dev));
	return 0;

	reg_fail:
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	i2c_del_adapter(&dev->i2c_adapter);
	#endif
	error:
	if (dev) {
	/* Destroy single thread */
	if (dev->workqueue)
	destroy_workqueue(dev->workqueue);
	/* this frees allocated memory */
	hdpvr_delete(dev);
	}
	return retval;
	}

	static void hdpvr_disconnect(struct usb_interface *interface)
	{
	struct hdpvr_device *dev = to_hdpvr_dev(usb_get_intfdata(interface));

	v4l2_info(&dev->v4l2_dev, "device %s disconnected\n",
	video_device_node_name(dev->video_dev));
	/* prevent more I/O from starting and stop any ongoing */
	mutex_lock(&dev->io_mutex);
	dev->status = STATUS_DISCONNECTED;
	wake_up_interruptible(&dev->wait_data);
	wake_up_interruptible(&dev->wait_buffer);
	mutex_unlock(&dev->io_mutex);
	v4l2_device_disconnect(&dev->v4l2_dev);
	msleep(100);
	flush_workqueue(dev->workqueue);
	mutex_lock(&dev->io_mutex);
	hdpvr_cancel_queue(dev);
	mutex_unlock(&dev->io_mutex);
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	i2c_del_adapter(&dev->i2c_adapter);
	#endif
	video_unregister_device(dev->video_dev);
	atomic_dec(&dev_nr);
	}


	static struct usb_driver hdpvr_usb_driver = {
	.name = "hdpvr",
	.probe = hdpvr_probe,
	.disconnect = hdpvr_disconnect,
	.id_table = hdpvr_table,
	};

	module_usb_driver(hdpvr_usb_driver);

	MODULE_LICENSE("GPL");
	MODULE_VERSION("0.2.1");
	MODULE_AUTHOR("Janne Grunau");
	MODULE_DESCRIPTION("Hauppauge HD PVR driver");