drivers/media/radio/radio-trust.c - kernel/msm-4.9 - Gitiles

 /* radio-trust.c - Trust FM Radio card driver for Linux 2.2
  * by Eric Lammerts <eric@scintilla.utwente.nl>
  *
  * Based on radio-aztech.c. Original notes:
  *
  * Adapted to support the Video for Linux API by
  * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
  *
  * Quay Ly
  * Donald Song
  * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
  * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
  * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
  *
  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  */

 #include <stdarg.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-common.h>

 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
 #define RADIO_VERSION KERNEL_VERSION(0,0,2)

 static struct v4l2_queryctrl radio_qctrl[] = {
 	{
 		.id            = V4L2_CID_AUDIO_MUTE,
 		.name          = "Mute",
 		.minimum       = 0,
 		.maximum       = 1,
 		.default_value = 1,
 		.type          = V4L2_CTRL_TYPE_BOOLEAN,
 	},{
 		.id            = V4L2_CID_AUDIO_VOLUME,
 		.name          = "Volume",
 		.minimum       = 0,
 		.maximum       = 65535,
 		.step          = 2048,
 		.default_value = 65535,
 		.type          = V4L2_CTRL_TYPE_INTEGER,
 	},{
 		.id            = V4L2_CID_AUDIO_BASS,
 		.name          = "Bass",
 		.minimum       = 0,
 		.maximum       = 65535,
 		.step          = 4370,
 		.default_value = 32768,
 		.type          = V4L2_CTRL_TYPE_INTEGER,
 	},{
 		.id            = V4L2_CID_AUDIO_TREBLE,
 		.name          = "Treble",
 		.minimum       = 0,
 		.maximum       = 65535,
 		.step          = 4370,
 		.default_value = 32768,
 		.type          = V4L2_CTRL_TYPE_INTEGER,
 	},
 };

 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */

 #ifndef CONFIG_RADIO_TRUST_PORT
 #define CONFIG_RADIO_TRUST_PORT -1
 #endif

 static int io = CONFIG_RADIO_TRUST_PORT;
 static int radio_nr = -1;
 static int ioval = 0xf;
 static __u16 curvol;
 static __u16 curbass;
 static __u16 curtreble;
 static unsigned long curfreq;
 static int curstereo;
 static int curmute;

 /* i2c addresses */
 #define TDA7318_ADDR 0x88
 #define TSA6060T_ADDR 0xc4

 #define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
 #define TR_SET_SCL outb(ioval |= 2, io)
 #define TR_CLR_SCL outb(ioval &= 0xfd, io)
 #define TR_SET_SDA outb(ioval |= 1, io)
 #define TR_CLR_SDA outb(ioval &= 0xfe, io)

 static void write_i2c(int n, ...)
 {
 	unsigned char val, mask;
 	va_list args;

 	va_start(args, n);

 	/* start condition */
 	TR_SET_SDA;
 	TR_SET_SCL;
 	TR_DELAY;
 	TR_CLR_SDA;
 	TR_CLR_SCL;
 	TR_DELAY;

 	for(; n; n--) {
 		val = va_arg(args, unsigned);
 		for(mask = 0x80; mask; mask >>= 1) {
 			if(val & mask)
 				TR_SET_SDA;
 			else
 				TR_CLR_SDA;
 			TR_SET_SCL;
 			TR_DELAY;
 			TR_CLR_SCL;
 			TR_DELAY;
 		}
 		/* acknowledge bit */
 		TR_SET_SDA;
 		TR_SET_SCL;
 		TR_DELAY;
 		TR_CLR_SCL;
 		TR_DELAY;
 	}

 	/* stop condition */
 	TR_CLR_SDA;
 	TR_DELAY;
 	TR_SET_SCL;
 	TR_DELAY;
 	TR_SET_SDA;
 	TR_DELAY;

 	va_end(args);
 }

 static void tr_setvol(__u16 vol)
 {
 	curvol = vol / 2048;
 	write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
 }

 static int basstreble2chip[15] = {
 	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
 };

 static void tr_setbass(__u16 bass)
 {
 	curbass = bass / 4370;
 	write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
 }

 static void tr_settreble(__u16 treble)
 {
 	curtreble = treble / 4370;
 	write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
 }

 static void tr_setstereo(int stereo)
 {
 	curstereo = !!stereo;
 	ioval = (ioval & 0xfb) | (!curstereo << 2);
 	outb(ioval, io);
 }

 static void tr_setmute(int mute)
 {
 	curmute = !!mute;
 	ioval = (ioval & 0xf7) | (curmute << 3);
 	outb(ioval, io);
 }

 static int tr_getsigstr(void)
 {
 	int i, v;

 	for(i = 0, v = 0; i < 100; i++) v |= inb(io);
 	return (v & 1)? 0 : 0xffff;
 }

 static int tr_getstereo(void)
 {
 	/* don't know how to determine it, just return the setting */
 	return curstereo;
 }

 static void tr_setfreq(unsigned long f)
 {
 	f /= 160;	/* Convert to 10 kHz units	*/
 	f += 1070;	/* Add 10.7 MHz IF			*/

 	write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
 }

 static int tr_do_ioctl(struct inode *inode, struct file *file,
 		       unsigned int cmd, void *arg)
 {
 	switch(cmd)
 	{
 		case VIDIOC_QUERYCAP:
 		{
 			struct v4l2_capability *v = arg;
 			memset(v,0,sizeof(*v));
 			strlcpy(v->driver, "radio-trust", sizeof (v->driver));
 			strlcpy(v->card, "Trust FM Radio", sizeof (v->card));
 			sprintf(v->bus_info,"ISA");
 			v->version = RADIO_VERSION;
 			v->capabilities = V4L2_CAP_TUNER;

 			return 0;
 		}
 		case VIDIOC_G_TUNER:
 		{
 			struct v4l2_tuner *v = arg;

 			if (v->index > 0)
 				return -EINVAL;

 			memset(v,0,sizeof(*v));
 			strcpy(v->name, "FM");
 			v->type = V4L2_TUNER_RADIO;

 			v->rangelow=(87.5*16000);
 			v->rangehigh=(108*16000);
 			v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
 			v->capability=V4L2_TUNER_CAP_LOW;
 			if(tr_getstereo())
 				v->audmode = V4L2_TUNER_MODE_STEREO;
 			else
 				v->audmode = V4L2_TUNER_MODE_MONO;
 			v->signal=tr_getsigstr();

 			return 0;
 		}
 		case VIDIOC_S_TUNER:
 		{
 			struct v4l2_tuner *v = arg;

 			if (v->index > 0)
 				return -EINVAL;

 			return 0;
 		}
 		case VIDIOC_S_FREQUENCY:
 		{
 			struct v4l2_frequency *f = arg;

 			curfreq = f->frequency;
 			tr_setfreq(curfreq);
 			return 0;
 		}
 		case VIDIOC_G_FREQUENCY:
 		{
 			struct v4l2_frequency *f = arg;

 			f->type = V4L2_TUNER_RADIO;
 			f->frequency = curfreq;

 			return 0;
 		}
 		case VIDIOC_QUERYCTRL:
 		{
 			struct v4l2_queryctrl *qc = arg;
 			int i;

 			for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 				if (qc->id && qc->id == radio_qctrl[i].id) {
 					memcpy(qc, &(radio_qctrl[i]),
 								sizeof(*qc));
 					return (0);
 				}
 			}
 			return -EINVAL;
 		}
 		case VIDIOC_G_CTRL:
 		{
 			struct v4l2_control *ctrl= arg;

 			switch (ctrl->id) {
 				case V4L2_CID_AUDIO_MUTE:
 					ctrl->value=curmute;
 					return (0);
 				case V4L2_CID_AUDIO_VOLUME:
 					ctrl->value= curvol * 2048;
 					return (0);
 				case V4L2_CID_AUDIO_BASS:
 					ctrl->value= curbass * 4370;
 					return (0);
 				case V4L2_CID_AUDIO_TREBLE:
 					ctrl->value= curtreble * 4370;
 					return (0);
 			}
 			return -EINVAL;
 		}
 		case VIDIOC_S_CTRL:
 		{
 			struct v4l2_control *ctrl= arg;

 			switch (ctrl->id) {
 				case V4L2_CID_AUDIO_MUTE:
 					tr_setmute(ctrl->value);
 					return 0;
 				case V4L2_CID_AUDIO_VOLUME:
 					tr_setvol(ctrl->value);
 					return 0;
 				case V4L2_CID_AUDIO_BASS:
 					tr_setbass(ctrl->value);
 					return 0;
 				case V4L2_CID_AUDIO_TREBLE:
 					tr_settreble(ctrl->value);
 					return (0);
 			}
 			return -EINVAL;
 		}

 		default:
 			return v4l_compat_translate_ioctl(inode,file,cmd,arg,
 							  tr_do_ioctl);
 	}
 }

 static int tr_ioctl(struct inode *inode, struct file *file,
 		    unsigned int cmd, unsigned long arg)
 {
 	return video_usercopy(inode, file, cmd, arg, tr_do_ioctl);
 }

 static struct file_operations trust_fops = {
 	.owner		= THIS_MODULE,
 	.open           = video_exclusive_open,
 	.release        = video_exclusive_release,
 	.ioctl		= tr_ioctl,
 	.compat_ioctl	= v4l_compat_ioctl32,
 	.llseek         = no_llseek,
 };

 static struct video_device trust_radio=
 {
 	.owner		= THIS_MODULE,
 	.name		= "Trust FM Radio",
 	.type		= VID_TYPE_TUNER,
 	.hardware	= 0,
 	.fops           = &trust_fops,
 };

 static int __init trust_init(void)
 {
 	if(io == -1) {
 		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 		return -EINVAL;
 	}
 	if(!request_region(io, 2, "Trust FM Radio")) {
 		printk(KERN_ERR "trust: port 0x%x already in use\n", io);
 		return -EBUSY;
 	}
 	if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 	{
 		release_region(io, 2);
 		return -EINVAL;
 	}

 	printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");

 	write_i2c(2, TDA7318_ADDR, 0x80);	/* speaker att. LF = 0 dB */
 	write_i2c(2, TDA7318_ADDR, 0xa0);	/* speaker att. RF = 0 dB */
 	write_i2c(2, TDA7318_ADDR, 0xc0);	/* speaker att. LR = 0 dB */
 	write_i2c(2, TDA7318_ADDR, 0xe0);	/* speaker att. RR = 0 dB */
 	write_i2c(2, TDA7318_ADDR, 0x40);	/* stereo 1 input, gain = 18.75 dB */

 	tr_setvol(0x8000);
 	tr_setbass(0x8000);
 	tr_settreble(0x8000);
 	tr_setstereo(1);

 	/* mute card - prevents noisy bootups */
 	tr_setmute(1);

 	return 0;
 }

 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
 MODULE_LICENSE("GPL");

 module_param(io, int, 0);
 MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
 module_param(radio_nr, int, 0);

 static void __exit cleanup_trust_module(void)
 {
 	video_unregister_device(&trust_radio);
 	release_region(io, 2);
 }

 module_init(trust_init);
 module_exit(cleanup_trust_module);
	/* radio-trust.c - Trust FM Radio card driver for Linux 2.2
	* by Eric Lammerts <eric@scintilla.utwente.nl>
	*
	* Based on radio-aztech.c. Original notes:
	*
	* Adapted to support the Video for Linux API by
	* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
	*
	* Quay Ly
	* Donald Song
	* Jason Lewis (jlewis@twilight.vtc.vsc.edu)
	* Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
	* William McGrath (wmcgrath@twilight.vtc.vsc.edu)
	*
	* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
	*/

	#include <stdarg.h>
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/ioport.h>
	#include <asm/io.h>
	#include <asm/uaccess.h>
	#include <linux/videodev2.h>
	#include <media/v4l2-common.h>

	#include <linux/version.h> /* for KERNEL_VERSION MACRO */
	#define RADIO_VERSION KERNEL_VERSION(0,0,2)

	static struct v4l2_queryctrl radio_qctrl[] = {
	{
	.id = V4L2_CID_AUDIO_MUTE,
	.name = "Mute",
	.minimum = 0,
	.maximum = 1,
	.default_value = 1,
	.type = V4L2_CTRL_TYPE_BOOLEAN,
	},{
	.id = V4L2_CID_AUDIO_VOLUME,
	.name = "Volume",
	.minimum = 0,
	.maximum = 65535,
	.step = 2048,
	.default_value = 65535,
	.type = V4L2_CTRL_TYPE_INTEGER,
	},{
	.id = V4L2_CID_AUDIO_BASS,
	.name = "Bass",
	.minimum = 0,
	.maximum = 65535,
	.step = 4370,
	.default_value = 32768,
	.type = V4L2_CTRL_TYPE_INTEGER,
	},{
	.id = V4L2_CID_AUDIO_TREBLE,
	.name = "Treble",
	.minimum = 0,
	.maximum = 65535,
	.step = 4370,
	.default_value = 32768,
	.type = V4L2_CTRL_TYPE_INTEGER,
	},
	};

	/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */

	#ifndef CONFIG_RADIO_TRUST_PORT
	#define CONFIG_RADIO_TRUST_PORT -1
	#endif

	static int io = CONFIG_RADIO_TRUST_PORT;
	static int radio_nr = -1;
	static int ioval = 0xf;
	static __u16 curvol;
	static __u16 curbass;
	static __u16 curtreble;
	static unsigned long curfreq;
	static int curstereo;
	static int curmute;

	/* i2c addresses */
	#define TDA7318_ADDR 0x88
	#define TSA6060T_ADDR 0xc4

	#define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
	#define TR_SET_SCL outb(ioval \|= 2, io)
	#define TR_CLR_SCL outb(ioval &= 0xfd, io)
	#define TR_SET_SDA outb(ioval \|= 1, io)
	#define TR_CLR_SDA outb(ioval &= 0xfe, io)

	static void write_i2c(int n, ...)
	{
	unsigned char val, mask;
	va_list args;

	va_start(args, n);

	/* start condition */
	TR_SET_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SDA;
	TR_CLR_SCL;
	TR_DELAY;

	for(; n; n--) {
	val = va_arg(args, unsigned);
	for(mask = 0x80; mask; mask >>= 1) {
	if(val & mask)
	TR_SET_SDA;
	else
	TR_CLR_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SCL;
	TR_DELAY;
	}
	/* acknowledge bit */
	TR_SET_SDA;
	TR_SET_SCL;
	TR_DELAY;
	TR_CLR_SCL;
	TR_DELAY;
	}

	/* stop condition */
	TR_CLR_SDA;
	TR_DELAY;
	TR_SET_SCL;
	TR_DELAY;
	TR_SET_SDA;
	TR_DELAY;

	va_end(args);
	}

	static void tr_setvol(__u16 vol)
	{
	curvol = vol / 2048;
	write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
	}

	static int basstreble2chip[15] = {
	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
	};

	static void tr_setbass(__u16 bass)
	{
	curbass = bass / 4370;
	write_i2c(2, TDA7318_ADDR, 0x60 \| basstreble2chip[curbass]);
	}

	static void tr_settreble(__u16 treble)
	{
	curtreble = treble / 4370;
	write_i2c(2, TDA7318_ADDR, 0x70 \| basstreble2chip[curtreble]);
	}

	static void tr_setstereo(int stereo)
	{
	curstereo = !!stereo;
	ioval = (ioval & 0xfb) \| (!curstereo << 2);
	outb(ioval, io);
	}

	static void tr_setmute(int mute)
	{
	curmute = !!mute;
	ioval = (ioval & 0xf7) \| (curmute << 3);
	outb(ioval, io);
	}

	static int tr_getsigstr(void)
	{
	int i, v;

	for(i = 0, v = 0; i < 100; i++) v \|= inb(io);
	return (v & 1)? 0 : 0xffff;
	}

	static int tr_getstereo(void)
	{
	/* don't know how to determine it, just return the setting */
	return curstereo;
	}

	static void tr_setfreq(unsigned long f)
	{
	f /= 160; /* Convert to 10 kHz units */
	f += 1070; /* Add 10.7 MHz IF */

	write_i2c(5, TSA6060T_ADDR, (f << 1) \| 1, f >> 7, 0x60 \| ((f >> 15) & 1), 0);
	}

	static int tr_do_ioctl(struct inode inode, struct file file,
	unsigned int cmd, void *arg)
	{
	switch(cmd)
	{
	case VIDIOC_QUERYCAP:
	{
	struct v4l2_capability *v = arg;
	memset(v,0,sizeof(*v));
	strlcpy(v->driver, "radio-trust", sizeof (v->driver));
	strlcpy(v->card, "Trust FM Radio", sizeof (v->card));
	sprintf(v->bus_info,"ISA");
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER;

	return 0;
	}
	case VIDIOC_G_TUNER:
	{
	struct v4l2_tuner *v = arg;

	if (v->index > 0)
	return -EINVAL;

	memset(v,0,sizeof(*v));
	strcpy(v->name, "FM");
	v->type = V4L2_TUNER_RADIO;

	v->rangelow=(87.5*16000);
	v->rangehigh=(108*16000);
	v->rxsubchans =V4L2_TUNER_SUB_MONO\|V4L2_TUNER_SUB_STEREO;
	v->capability=V4L2_TUNER_CAP_LOW;
	if(tr_getstereo())
	v->audmode = V4L2_TUNER_MODE_STEREO;
	else
	v->audmode = V4L2_TUNER_MODE_MONO;
	v->signal=tr_getsigstr();

	return 0;
	}
	case VIDIOC_S_TUNER:
	{
	struct v4l2_tuner *v = arg;

	if (v->index > 0)
	return -EINVAL;

	return 0;
	}
	case VIDIOC_S_FREQUENCY:
	{
	struct v4l2_frequency *f = arg;

	curfreq = f->frequency;
	tr_setfreq(curfreq);
	return 0;
	}
	case VIDIOC_G_FREQUENCY:
	{
	struct v4l2_frequency *f = arg;

	f->type = V4L2_TUNER_RADIO;
	f->frequency = curfreq;

	return 0;
	}
	case VIDIOC_QUERYCTRL:
	{
	struct v4l2_queryctrl *qc = arg;
	int i;

	for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
	if (qc->id && qc->id == radio_qctrl[i].id) {
	memcpy(qc, &(radio_qctrl[i]),
	sizeof(*qc));
	return (0);
	}
	}
	return -EINVAL;
	}
	case VIDIOC_G_CTRL:
	{
	struct v4l2_control *ctrl= arg;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	ctrl->value=curmute;
	return (0);
	case V4L2_CID_AUDIO_VOLUME:
	ctrl->value= curvol * 2048;
	return (0);
	case V4L2_CID_AUDIO_BASS:
	ctrl->value= curbass * 4370;
	return (0);
	case V4L2_CID_AUDIO_TREBLE:
	ctrl->value= curtreble * 4370;
	return (0);
	}
	return -EINVAL;
	}
	case VIDIOC_S_CTRL:
	{
	struct v4l2_control *ctrl= arg;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	tr_setmute(ctrl->value);
	return 0;
	case V4L2_CID_AUDIO_VOLUME:
	tr_setvol(ctrl->value);
	return 0;
	case V4L2_CID_AUDIO_BASS:
	tr_setbass(ctrl->value);
	return 0;
	case V4L2_CID_AUDIO_TREBLE:
	tr_settreble(ctrl->value);
	return (0);
	}
	return -EINVAL;
	}

	default:
	return v4l_compat_translate_ioctl(inode,file,cmd,arg,
	tr_do_ioctl);
	}
	}

	static int tr_ioctl(struct inode inode, struct file file,
	unsigned int cmd, unsigned long arg)
	{
	return video_usercopy(inode, file, cmd, arg, tr_do_ioctl);
	}

	static struct file_operations trust_fops = {
	.owner = THIS_MODULE,
	.open = video_exclusive_open,
	.release = video_exclusive_release,
	.ioctl = tr_ioctl,
	.compat_ioctl = v4l_compat_ioctl32,
	.llseek = no_llseek,
	};

	static struct video_device trust_radio=
	{
	.owner = THIS_MODULE,
	.name = "Trust FM Radio",
	.type = VID_TYPE_TUNER,
	.hardware = 0,
	.fops = &trust_fops,
	};

	static int __init trust_init(void)
	{
	if(io == -1) {
	printk(KERN_ERR "You must set an I/O address with io=0x???\n");
	return -EINVAL;
	}
	if(!request_region(io, 2, "Trust FM Radio")) {
	printk(KERN_ERR "trust: port 0x%x already in use\n", io);
	return -EBUSY;
	}
	if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
	{
	release_region(io, 2);
	return -EINVAL;
	}

	printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");

	write_i2c(2, TDA7318_ADDR, 0x80); /* speaker att. LF = 0 dB */
	write_i2c(2, TDA7318_ADDR, 0xa0); /* speaker att. RF = 0 dB */
	write_i2c(2, TDA7318_ADDR, 0xc0); /* speaker att. LR = 0 dB */
	write_i2c(2, TDA7318_ADDR, 0xe0); /* speaker att. RR = 0 dB */
	write_i2c(2, TDA7318_ADDR, 0x40); /* stereo 1 input, gain = 18.75 dB */

	tr_setvol(0x8000);
	tr_setbass(0x8000);
	tr_settreble(0x8000);
	tr_setstereo(1);

	/* mute card - prevents noisy bootups */
	tr_setmute(1);

	return 0;
	}

	MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
	MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
	MODULE_LICENSE("GPL");

	module_param(io, int, 0);
	MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
	module_param(radio_nr, int, 0);

	static void __exit cleanup_trust_module(void)
	{
	video_unregister_device(&trust_radio);
	release_region(io, 2);
	}

	module_init(trust_init);
	module_exit(cleanup_trust_module);