drivers/media/radio/radio-aztech.c - linux - Git at Google

 /* radio-aztech.c - Aztech radio card driver for Linux 2.2
  *
  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  * 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)
  *
  * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
  * along with more information on the card itself.
  *
  * History:
  * 1999-02-24	Russell Kroll <rkroll@exploits.org>
  *		Fine tuning/VIDEO_TUNER_LOW
  * 		Range expanded to 87-108 MHz (from 87.9-107.8)
  *
  * Notable changes from the original source:
  * - includes stripped down to the essentials
  * - for loops used as delays replaced with udelay()
  * - #defines removed, changed to static values
  * - tuning structure changed - no more character arrays, other changes
 */

 #include <linux/module.h>	/* Modules 			*/
 #include <linux/init.h>		/* Initdata			*/
 #include <linux/ioport.h>	/* request_region		*/
 #include <linux/delay.h>	/* udelay			*/
 #include <asm/io.h>		/* outb, outb_p			*/
 #include <asm/uaccess.h>	/* copy to/from user		*/
 #include <linux/videodev2.h>	/* kernel radio structs		*/
 #include <media/v4l2-common.h>
 #include <media/v4l2-ioctl.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       = 0xff,
 		.step          = 1,
 		.default_value = 0xff,
 		.type          = V4L2_CTRL_TYPE_INTEGER,
 	}
 };

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

 #ifndef CONFIG_RADIO_AZTECH_PORT
 #define CONFIG_RADIO_AZTECH_PORT -1
 #endif

 static int io = CONFIG_RADIO_AZTECH_PORT;
 static int radio_nr = -1;
 static int radio_wait_time = 1000;
 static struct mutex lock;

 struct az_device
 {
 	int curvol;
 	unsigned long curfreq;
 	int stereo;
 };

 static int volconvert(int level)
 {
 	level>>=14;		/* Map 16bits down to 2 bit */
 	level&=3;

 	/* convert to card-friendly values */
 	switch (level)
 	{
 		case 0:
 			return 0;
 		case 1:
 			return 1;
 		case 2:
 			return 4;
 		case 3:
 			return 5;
 	}
 	return 0;	/* Quieten gcc */
 }

 static void send_0_byte (struct az_device *dev)
 {
 	udelay(radio_wait_time);
 	outb_p(2+volconvert(dev->curvol), io);
 	outb_p(64+2+volconvert(dev->curvol), io);
 }

 static void send_1_byte (struct az_device *dev)
 {
 	udelay (radio_wait_time);
 	outb_p(128+2+volconvert(dev->curvol), io);
 	outb_p(128+64+2+volconvert(dev->curvol), io);
 }

 static int az_setvol(struct az_device *dev, int vol)
 {
 	mutex_lock(&lock);
 	outb (volconvert(vol), io);
 	mutex_unlock(&lock);
 	return 0;
 }

 /* thanks to Michael Dwyer for giving me a dose of clues in
  * the signal strength department..
  *
  * This card has a stereo bit - bit 0 set = mono, not set = stereo
  * It also has a "signal" bit - bit 1 set = bad signal, not set = good
  *
  */

 static int az_getsigstr(struct az_device *dev)
 {
 	if (inb(io) & 2)	/* bit set = no signal present */
 		return 0;
 	return 1;		/* signal present */
 }

 static int az_getstereo(struct az_device *dev)
 {
 	if (inb(io) & 1) 	/* bit set = mono */
 		return 0;
 	return 1;		/* stereo */
 }

 static int az_setfreq(struct az_device *dev, unsigned long frequency)
 {
 	int  i;

 	frequency += 171200;		/* Add 10.7 MHz IF		*/
 	frequency /= 800;		/* Convert to 50 kHz units	*/

 	mutex_lock(&lock);

 	send_0_byte (dev);		/*  0: LSB of frequency       */

 	for (i = 0; i < 13; i++)	/*   : frequency bits (1-13)  */
 		if (frequency & (1 << i))
 			send_1_byte (dev);
 		else
 			send_0_byte (dev);

 	send_0_byte (dev);		/* 14: test bit - always 0    */
 	send_0_byte (dev);		/* 15: test bit - always 0    */
 	send_0_byte (dev);		/* 16: band data 0 - always 0 */
 	if (dev->stereo)		/* 17: stereo (1 to enable)   */
 		send_1_byte (dev);
 	else
 		send_0_byte (dev);

 	send_1_byte (dev);		/* 18: band data 1 - unknown  */
 	send_0_byte (dev);		/* 19: time base - always 0   */
 	send_0_byte (dev);		/* 20: spacing (0 = 25 kHz)   */
 	send_1_byte (dev);		/* 21: spacing (1 = 25 kHz)   */
 	send_0_byte (dev);		/* 22: spacing (0 = 25 kHz)   */
 	send_1_byte (dev);		/* 23: AM/FM (FM = 1, always) */

 	/* latch frequency */

 	udelay (radio_wait_time);
 	outb_p(128+64+volconvert(dev->curvol), io);

 	mutex_unlock(&lock);

 	return 0;
 }

 static int vidioc_querycap (struct file *file, void  *priv,
 					struct v4l2_capability *v)
 {
 	strlcpy(v->driver, "radio-aztech", sizeof (v->driver));
 	strlcpy(v->card, "Aztech Radio", sizeof (v->card));
 	sprintf(v->bus_info,"ISA");
 	v->version = RADIO_VERSION;
 	v->capabilities = V4L2_CAP_TUNER;
 	return 0;
 }

 static int vidioc_g_tuner (struct file *file, void *priv,
 				struct v4l2_tuner *v)
 {
 	struct video_device *dev = video_devdata(file);
 	struct az_device *az = dev->priv;

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

 	strcpy(v->name, "FM");
 	v->type = V4L2_TUNER_RADIO;

 	v->rangelow=(87*16000);
 	v->rangehigh=(108*16000);
 	v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
 	v->capability=V4L2_TUNER_CAP_LOW;
 	if(az_getstereo(az))
 		v->audmode = V4L2_TUNER_MODE_STEREO;
 	else
 		v->audmode = V4L2_TUNER_MODE_MONO;
 	v->signal=0xFFFF*az_getsigstr(az);

 	return 0;
 }


 static int vidioc_s_tuner (struct file *file, void *priv,
 				struct v4l2_tuner *v)
 {
 	if (v->index > 0)
 		return -EINVAL;

 	return 0;
 }

 static int vidioc_g_audio (struct file *file, void *priv,
 			   struct v4l2_audio *a)
 {
 	if (a->index > 1)
 		return -EINVAL;

 	strcpy(a->name, "Radio");
 	a->capability = V4L2_AUDCAP_STEREO;
 	return 0;
 }

 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 {
 	*i = 0;
 	return 0;
 }

 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 {
 	if (i != 0)
 		return -EINVAL;
 	return 0;
 }


 static int vidioc_s_audio (struct file *file, void *priv,
 			   struct v4l2_audio *a)
 {
 	if (a->index != 0)
 		return -EINVAL;

 	return 0;
 }

 static int vidioc_s_frequency (struct file *file, void *priv,
 				struct v4l2_frequency *f)
 {
 	struct video_device *dev = video_devdata(file);
 	struct az_device *az = dev->priv;

 	az->curfreq = f->frequency;
 	az_setfreq(az, az->curfreq);
 	return 0;
 }

 static int vidioc_g_frequency (struct file *file, void *priv,
 				struct v4l2_frequency *f)
 {
 	struct video_device *dev = video_devdata(file);
 	struct az_device *az = dev->priv;

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

 	return 0;
 }

 static int vidioc_queryctrl (struct file *file, void *priv,
 			    struct v4l2_queryctrl *qc)
 {
 	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;
 }

 static int vidioc_g_ctrl (struct file *file, void *priv,
 			    struct v4l2_control *ctrl)
 {
 	struct video_device *dev = video_devdata(file);
 	struct az_device *az = dev->priv;

 	switch (ctrl->id) {
 		case V4L2_CID_AUDIO_MUTE:
 			if (az->curvol==0)
 				ctrl->value=1;
 			else
 				ctrl->value=0;
 			return (0);
 		case V4L2_CID_AUDIO_VOLUME:
 			ctrl->value=az->curvol * 6554;
 			return (0);
 	}
 	return -EINVAL;
 }

 static int vidioc_s_ctrl (struct file *file, void *priv,
 			    struct v4l2_control *ctrl)
 {
 	struct video_device *dev = video_devdata(file);
 	struct az_device *az = dev->priv;

 	switch (ctrl->id) {
 		case V4L2_CID_AUDIO_MUTE:
 			if (ctrl->value) {
 				az_setvol(az,0);
 			} else {
 				az_setvol(az,az->curvol);
 			}
 			return (0);
 		case V4L2_CID_AUDIO_VOLUME:
 			az_setvol(az,ctrl->value);
 			return (0);
 	}
 	return -EINVAL;
 }

 static struct az_device aztech_unit;

 static const struct file_operations aztech_fops = {
 	.owner		= THIS_MODULE,
 	.open           = video_exclusive_open,
 	.release        = video_exclusive_release,
 	.ioctl		= video_ioctl2,
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= v4l_compat_ioctl32,
 #endif
 	.llseek         = no_llseek,
 };

 static const struct v4l2_ioctl_ops aztech_ioctl_ops = {
 	.vidioc_querycap    = vidioc_querycap,
 	.vidioc_g_tuner     = vidioc_g_tuner,
 	.vidioc_s_tuner     = vidioc_s_tuner,
 	.vidioc_g_audio     = vidioc_g_audio,
 	.vidioc_s_audio     = vidioc_s_audio,
 	.vidioc_g_input     = vidioc_g_input,
 	.vidioc_s_input     = vidioc_s_input,
 	.vidioc_g_frequency = vidioc_g_frequency,
 	.vidioc_s_frequency = vidioc_s_frequency,
 	.vidioc_queryctrl   = vidioc_queryctrl,
 	.vidioc_g_ctrl      = vidioc_g_ctrl,
 	.vidioc_s_ctrl      = vidioc_s_ctrl,
 };

 static struct video_device aztech_radio = {
 	.name		    = "Aztech radio",
 	.fops               = &aztech_fops,
 	.ioctl_ops 	    = &aztech_ioctl_ops,
 };

 module_param_named(debug,aztech_radio.debug, int, 0644);
 MODULE_PARM_DESC(debug,"activates debug info");

 static int __init aztech_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, "aztech"))
 	{
 		printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
 		return -EBUSY;
 	}

 	mutex_init(&lock);
 	aztech_radio.priv=&aztech_unit;

 	if (video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 		release_region(io,2);
 		return -EINVAL;
 	}

 	printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
 	/* mute card - prevents noisy bootups */
 	outb (0, io);
 	return 0;
 }

 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
 MODULE_LICENSE("GPL");

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

 static void __exit aztech_cleanup(void)
 {
 	video_unregister_device(&aztech_radio);
 	release_region(io,2);
 }

 module_init(aztech_init);
 module_exit(aztech_cleanup);
	/* radio-aztech.c - Aztech radio card driver for Linux 2.2
	*
	* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
	* 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)
	*
	* The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
	* along with more information on the card itself.
	*
	* History:
	* 1999-02-24 Russell Kroll <rkroll@exploits.org>
	* Fine tuning/VIDEO_TUNER_LOW
	* Range expanded to 87-108 MHz (from 87.9-107.8)
	*
	* Notable changes from the original source:
	* - includes stripped down to the essentials
	* - for loops used as delays replaced with udelay()
	* - #defines removed, changed to static values
	* - tuning structure changed - no more character arrays, other changes
	*/

	#include <linux/module.h> /* Modules */
	#include <linux/init.h> /* Initdata */
	#include <linux/ioport.h> /* request_region */
	#include <linux/delay.h> /* udelay */
	#include <asm/io.h> /* outb, outb_p */
	#include <asm/uaccess.h> /* copy to/from user */
	#include <linux/videodev2.h> /* kernel radio structs */
	#include <media/v4l2-common.h>
	#include <media/v4l2-ioctl.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 = 0xff,
	.step = 1,
	.default_value = 0xff,
	.type = V4L2_CTRL_TYPE_INTEGER,
	}
	};

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

	#ifndef CONFIG_RADIO_AZTECH_PORT
	#define CONFIG_RADIO_AZTECH_PORT -1
	#endif

	static int io = CONFIG_RADIO_AZTECH_PORT;
	static int radio_nr = -1;
	static int radio_wait_time = 1000;
	static struct mutex lock;

	struct az_device
	{
	int curvol;
	unsigned long curfreq;
	int stereo;
	};

	static int volconvert(int level)
	{
	level>>=14; /* Map 16bits down to 2 bit */
	level&=3;

	/* convert to card-friendly values */
	switch (level)
	{
	case 0:
	return 0;
	case 1:
	return 1;
	case 2:
	return 4;
	case 3:
	return 5;
	}
	return 0; /* Quieten gcc */
	}

	static void send_0_byte (struct az_device *dev)
	{
	udelay(radio_wait_time);
	outb_p(2+volconvert(dev->curvol), io);
	outb_p(64+2+volconvert(dev->curvol), io);
	}

	static void send_1_byte (struct az_device *dev)
	{
	udelay (radio_wait_time);
	outb_p(128+2+volconvert(dev->curvol), io);
	outb_p(128+64+2+volconvert(dev->curvol), io);
	}

	static int az_setvol(struct az_device *dev, int vol)
	{
	mutex_lock(&lock);
	outb (volconvert(vol), io);
	mutex_unlock(&lock);
	return 0;
	}

	/* thanks to Michael Dwyer for giving me a dose of clues in
	* the signal strength department..
	*
	* This card has a stereo bit - bit 0 set = mono, not set = stereo
	* It also has a "signal" bit - bit 1 set = bad signal, not set = good
	*
	*/

	static int az_getsigstr(struct az_device *dev)
	{
	if (inb(io) & 2) /* bit set = no signal present */
	return 0;
	return 1; /* signal present */
	}

	static int az_getstereo(struct az_device *dev)
	{
	if (inb(io) & 1) /* bit set = mono */
	return 0;
	return 1; /* stereo */
	}

	static int az_setfreq(struct az_device *dev, unsigned long frequency)
	{
	int i;

	frequency += 171200; /* Add 10.7 MHz IF */
	frequency /= 800; /* Convert to 50 kHz units */

	mutex_lock(&lock);

	send_0_byte (dev); /* 0: LSB of frequency */

	for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
	if (frequency & (1 << i))
	send_1_byte (dev);
	else
	send_0_byte (dev);

	send_0_byte (dev); /* 14: test bit - always 0 */
	send_0_byte (dev); /* 15: test bit - always 0 */
	send_0_byte (dev); /* 16: band data 0 - always 0 */
	if (dev->stereo) /* 17: stereo (1 to enable) */
	send_1_byte (dev);
	else
	send_0_byte (dev);

	send_1_byte (dev); /* 18: band data 1 - unknown */
	send_0_byte (dev); /* 19: time base - always 0 */
	send_0_byte (dev); /* 20: spacing (0 = 25 kHz) */
	send_1_byte (dev); /* 21: spacing (1 = 25 kHz) */
	send_0_byte (dev); /* 22: spacing (0 = 25 kHz) */
	send_1_byte (dev); /* 23: AM/FM (FM = 1, always) */

	/* latch frequency */

	udelay (radio_wait_time);
	outb_p(128+64+volconvert(dev->curvol), io);

	mutex_unlock(&lock);

	return 0;
	}

	static int vidioc_querycap (struct file file, void priv,
	struct v4l2_capability *v)
	{
	strlcpy(v->driver, "radio-aztech", sizeof (v->driver));
	strlcpy(v->card, "Aztech Radio", sizeof (v->card));
	sprintf(v->bus_info,"ISA");
	v->version = RADIO_VERSION;
	v->capabilities = V4L2_CAP_TUNER;
	return 0;
	}

	static int vidioc_g_tuner (struct file file, void priv,
	struct v4l2_tuner *v)
	{
	struct video_device *dev = video_devdata(file);
	struct az_device *az = dev->priv;

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

	strcpy(v->name, "FM");
	v->type = V4L2_TUNER_RADIO;

	v->rangelow=(87*16000);
	v->rangehigh=(108*16000);
	v->rxsubchans =V4L2_TUNER_SUB_MONO\|V4L2_TUNER_SUB_STEREO;
	v->capability=V4L2_TUNER_CAP_LOW;
	if(az_getstereo(az))
	v->audmode = V4L2_TUNER_MODE_STEREO;
	else
	v->audmode = V4L2_TUNER_MODE_MONO;
	v->signal=0xFFFF*az_getsigstr(az);

	return 0;
	}


	static int vidioc_s_tuner (struct file file, void priv,
	struct v4l2_tuner *v)
	{
	if (v->index > 0)
	return -EINVAL;

	return 0;
	}

	static int vidioc_g_audio (struct file file, void priv,
	struct v4l2_audio *a)
	{
	if (a->index > 1)
	return -EINVAL;

	strcpy(a->name, "Radio");
	a->capability = V4L2_AUDCAP_STEREO;
	return 0;
	}

	static int vidioc_g_input(struct file filp, void priv, unsigned int *i)
	{
	*i = 0;
	return 0;
	}

	static int vidioc_s_input(struct file filp, void priv, unsigned int i)
	{
	if (i != 0)
	return -EINVAL;
	return 0;
	}


	static int vidioc_s_audio (struct file file, void priv,
	struct v4l2_audio *a)
	{
	if (a->index != 0)
	return -EINVAL;

	return 0;
	}

	static int vidioc_s_frequency (struct file file, void priv,
	struct v4l2_frequency *f)
	{
	struct video_device *dev = video_devdata(file);
	struct az_device *az = dev->priv;

	az->curfreq = f->frequency;
	az_setfreq(az, az->curfreq);
	return 0;
	}

	static int vidioc_g_frequency (struct file file, void priv,
	struct v4l2_frequency *f)
	{
	struct video_device *dev = video_devdata(file);
	struct az_device *az = dev->priv;

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

	return 0;
	}

	static int vidioc_queryctrl (struct file file, void priv,
	struct v4l2_queryctrl *qc)
	{
	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;
	}

	static int vidioc_g_ctrl (struct file file, void priv,
	struct v4l2_control *ctrl)
	{
	struct video_device *dev = video_devdata(file);
	struct az_device *az = dev->priv;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	if (az->curvol==0)
	ctrl->value=1;
	else
	ctrl->value=0;
	return (0);
	case V4L2_CID_AUDIO_VOLUME:
	ctrl->value=az->curvol * 6554;
	return (0);
	}
	return -EINVAL;
	}

	static int vidioc_s_ctrl (struct file file, void priv,
	struct v4l2_control *ctrl)
	{
	struct video_device *dev = video_devdata(file);
	struct az_device *az = dev->priv;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	if (ctrl->value) {
	az_setvol(az,0);
	} else {
	az_setvol(az,az->curvol);
	}
	return (0);
	case V4L2_CID_AUDIO_VOLUME:
	az_setvol(az,ctrl->value);
	return (0);
	}
	return -EINVAL;
	}

	static struct az_device aztech_unit;

	static const struct file_operations aztech_fops = {
	.owner = THIS_MODULE,
	.open = video_exclusive_open,
	.release = video_exclusive_release,
	.ioctl = video_ioctl2,
	#ifdef CONFIG_COMPAT
	.compat_ioctl = v4l_compat_ioctl32,
	#endif
	.llseek = no_llseek,
	};

	static const struct v4l2_ioctl_ops aztech_ioctl_ops = {
	.vidioc_querycap = vidioc_querycap,
	.vidioc_g_tuner = vidioc_g_tuner,
	.vidioc_s_tuner = vidioc_s_tuner,
	.vidioc_g_audio = vidioc_g_audio,
	.vidioc_s_audio = vidioc_s_audio,
	.vidioc_g_input = vidioc_g_input,
	.vidioc_s_input = vidioc_s_input,
	.vidioc_g_frequency = vidioc_g_frequency,
	.vidioc_s_frequency = vidioc_s_frequency,
	.vidioc_queryctrl = vidioc_queryctrl,
	.vidioc_g_ctrl = vidioc_g_ctrl,
	.vidioc_s_ctrl = vidioc_s_ctrl,
	};

	static struct video_device aztech_radio = {
	.name = "Aztech radio",
	.fops = &aztech_fops,
	.ioctl_ops = &aztech_ioctl_ops,
	};

	module_param_named(debug,aztech_radio.debug, int, 0644);
	MODULE_PARM_DESC(debug,"activates debug info");

	static int __init aztech_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, "aztech"))
	{
	printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
	return -EBUSY;
	}

	mutex_init(&lock);
	aztech_radio.priv=&aztech_unit;

	if (video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
	release_region(io,2);
	return -EINVAL;
	}

	printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
	/* mute card - prevents noisy bootups */
	outb (0, io);
	return 0;
	}

	MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
	MODULE_DESCRIPTION("A driver for the Aztech radio card.");
	MODULE_LICENSE("GPL");

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

	static void __exit aztech_cleanup(void)
	{
	video_unregister_device(&aztech_radio);
	release_region(io,2);
	}

	module_init(aztech_init);
	module_exit(aztech_cleanup);