drivers/media/radio/radio-zoltrix.c - linux/kernel/git/davem/net-next - Git at Google

 /* zoltrix radio plus driver for Linux radio support
  * (c) 1998 C. van Schaik <carl@leg.uct.ac.za>
  *
  * BUGS
  *  Due to the inconsistency in reading from the signal flags
  *  it is difficult to get an accurate tuned signal.
  *
  *  It seems that the card is not linear to 0 volume. It cuts off
  *  at a low volume, and it is not possible (at least I have not found)
  *  to get fine volume control over the low volume range.
  *
  *  Some code derived from code by Romolo Manfredini
  *				   romolo@bicnet.it
  *
  * 1999-05-06 - (C. van Schaik)
  *	      - Make signal strength and stereo scans
  *	        kinder to cpu while in delay
  * 1999-01-05 - (C. van Schaik)
  *	      - Changed tuning to 1/160Mhz accuracy
  *	      - Added stereo support
  *		(card defaults to stereo)
  *		(can explicitly force mono on the card)
  *		(can detect if station is in stereo)
  *	      - Added unmute function
  *	      - Reworked ioctl functions
  * 2002-07-15 - Fix Stereo typo
  */

 #include <linux/module.h>	/* Modules                        */
 #include <linux/init.h>		/* Initdata                       */
 #include <linux/ioport.h>	/* request_region		  */
 #include <linux/delay.h>	/* udelay, msleep                 */
 #include <asm/io.h>		/* outb, outb_p                   */
 #include <asm/uaccess.h>	/* copy to/from user              */
 #include <linux/videodev.h>	/* kernel radio structs           */
 #include <linux/config.h>	/* CONFIG_RADIO_ZOLTRIX_PORT      */

 #ifndef CONFIG_RADIO_ZOLTRIX_PORT
 #define CONFIG_RADIO_ZOLTRIX_PORT -1
 #endif

 static int io = CONFIG_RADIO_ZOLTRIX_PORT;
 static int radio_nr = -1;

 struct zol_device {
 	int port;
 	int curvol;
 	unsigned long curfreq;
 	int muted;
 	unsigned int stereo;
 	struct mutex lock;
 };

 static int zol_setvol(struct zol_device *dev, int vol)
 {
 	dev->curvol = vol;
 	if (dev->muted)
 		return 0;

 	mutex_lock(&dev->lock);
 	if (vol == 0) {
 		outb(0, io);
 		outb(0, io);
 		inb(io + 3);    /* Zoltrix needs to be read to confirm */
 		mutex_unlock(&dev->lock);
 		return 0;
 	}

 	outb(dev->curvol-1, io);
 	msleep(10);
 	inb(io + 2);
 	mutex_unlock(&dev->lock);
 	return 0;
 }

 static void zol_mute(struct zol_device *dev)
 {
 	dev->muted = 1;
 	mutex_lock(&dev->lock);
 	outb(0, io);
 	outb(0, io);
 	inb(io + 3);            /* Zoltrix needs to be read to confirm */
 	mutex_unlock(&dev->lock);
 }

 static void zol_unmute(struct zol_device *dev)
 {
 	dev->muted = 0;
 	zol_setvol(dev, dev->curvol);
 }

 static int zol_setfreq(struct zol_device *dev, unsigned long freq)
 {
 	/* tunes the radio to the desired frequency */
 	unsigned long long bitmask, f, m;
 	unsigned int stereo = dev->stereo;
 	int i;

 	if (freq == 0)
 		return 1;
 	m = (freq / 160 - 8800) * 2;
 	f = (unsigned long long) m + 0x4d1c;

 	bitmask = 0xc480402c10080000ull;
 	i = 45;

 	mutex_lock(&dev->lock);

 	outb(0, io);
 	outb(0, io);
 	inb(io + 3);            /* Zoltrix needs to be read to confirm */

 	outb(0x40, io);
 	outb(0xc0, io);

 	bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ ( stereo << 31));
 	while (i--) {
 		if ((bitmask & 0x8000000000000000ull) != 0) {
 			outb(0x80, io);
 			udelay(50);
 			outb(0x00, io);
 			udelay(50);
 			outb(0x80, io);
 			udelay(50);
 		} else {
 			outb(0xc0, io);
 			udelay(50);
 			outb(0x40, io);
 			udelay(50);
 			outb(0xc0, io);
 			udelay(50);
 		}
 		bitmask *= 2;
 	}
 	/* termination sequence */
 	outb(0x80, io);
 	outb(0xc0, io);
 	outb(0x40, io);
 	udelay(1000);
 	inb(io+2);

         udelay(1000);

 	if (dev->muted)
 	{
 		outb(0, io);
 		outb(0, io);
 		inb(io + 3);
 		udelay(1000);
 	}

 	mutex_unlock(&dev->lock);

 	if(!dev->muted)
 	{
 	        zol_setvol(dev, dev->curvol);
 	}
 	return 0;
 }

 /* Get signal strength */

 static int zol_getsigstr(struct zol_device *dev)
 {
 	int a, b;

 	mutex_lock(&dev->lock);
 	outb(0x00, io);         /* This stuff I found to do nothing */
 	outb(dev->curvol, io);
 	msleep(20);

 	a = inb(io);
 	msleep(10);
 	b = inb(io);

 	mutex_unlock(&dev->lock);

 	if (a != b)
 		return (0);

         if ((a == 0xcf) || (a == 0xdf)  /* I found this out by playing */
 		|| (a == 0xef))       /* with a binary scanner on the card io */
 		return (1);
  	return (0);
 }

 static int zol_is_stereo (struct zol_device *dev)
 {
 	int x1, x2;

 	mutex_lock(&dev->lock);

 	outb(0x00, io);
 	outb(dev->curvol, io);
 	msleep(20);

 	x1 = inb(io);
 	msleep(10);
 	x2 = inb(io);

 	mutex_unlock(&dev->lock);

 	if ((x1 == x2) && (x1 == 0xcf))
 		return 1;
 	return 0;
 }

 static int zol_do_ioctl(struct inode *inode, struct file *file,
 			unsigned int cmd, void *arg)
 {
 	struct video_device *dev = video_devdata(file);
 	struct zol_device *zol = dev->priv;

 	switch (cmd) {
 	case VIDIOCGCAP:
 		{
 			struct video_capability *v = arg;

 			memset(v,0,sizeof(*v));
 			v->type = VID_TYPE_TUNER;
 			v->channels = 1 + zol->stereo;
 			v->audios = 1;
 			strcpy(v->name, "Zoltrix Radio");
 			return 0;
 		}
 	case VIDIOCGTUNER:
 		{
 			struct video_tuner *v = arg;
 			if (v->tuner)
 				return -EINVAL;
 			strcpy(v->name, "FM");
 			v->rangelow = (int) (88.0 * 16000);
 			v->rangehigh = (int) (108.0 * 16000);
 			v->flags = zol_is_stereo(zol)
 					? VIDEO_TUNER_STEREO_ON : 0;
 			v->flags |= VIDEO_TUNER_LOW;
 			v->mode = VIDEO_MODE_AUTO;
 			v->signal = 0xFFFF * zol_getsigstr(zol);
 			return 0;
 		}
 	case VIDIOCSTUNER:
 		{
 			struct video_tuner *v = arg;
 			if (v->tuner != 0)
 				return -EINVAL;
 			/* Only 1 tuner so no setting needed ! */
 			return 0;
 		}
 	case VIDIOCGFREQ:
 	{
 		unsigned long *freq = arg;
 		*freq = zol->curfreq;
 		return 0;
 	}
 	case VIDIOCSFREQ:
 	{
 		unsigned long *freq = arg;
 		zol->curfreq = *freq;
 		zol_setfreq(zol, zol->curfreq);
 		return 0;
 	}
 	case VIDIOCGAUDIO:
 		{
 			struct video_audio *v = arg;
 			memset(v, 0, sizeof(*v));
 			v->flags |= VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME;
 			v->mode |= zol_is_stereo(zol)
 				? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
 			v->volume = zol->curvol * 4096;
 			v->step = 4096;
 			strcpy(v->name, "Zoltrix Radio");
 			return 0;
 		}
 	case VIDIOCSAUDIO:
 		{
 			struct video_audio *v = arg;
 			if (v->audio)
 				return -EINVAL;

 			if (v->flags & VIDEO_AUDIO_MUTE)
 				zol_mute(zol);
 			else {
 				zol_unmute(zol);
 				zol_setvol(zol, v->volume / 4096);
 			}

 			if (v->mode & VIDEO_SOUND_STEREO) {
 				zol->stereo = 1;
 				zol_setfreq(zol, zol->curfreq);
 			}
 			if (v->mode & VIDEO_SOUND_MONO) {
 				zol->stereo = 0;
 				zol_setfreq(zol, zol->curfreq);
 			}
 			return 0;
 		}
 	default:
 		return -ENOIOCTLCMD;
 	}
 }

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

 static struct zol_device zoltrix_unit;

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

 static struct video_device zoltrix_radio =
 {
 	.owner		= THIS_MODULE,
 	.name		= "Zoltrix Radio Plus",
 	.type		= VID_TYPE_TUNER,
 	.hardware	= VID_HARDWARE_ZOLTRIX,
 	.fops           = &zoltrix_fops,
 };

 static int __init zoltrix_init(void)
 {
 	if (io == -1) {
 		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 		return -EINVAL;
 	}
 	if ((io != 0x20c) && (io != 0x30c)) {
 		printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
 		return -ENXIO;
 	}

 	zoltrix_radio.priv = &zoltrix_unit;
 	if (!request_region(io, 2, "zoltrix")) {
 		printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
 		return -EBUSY;
 	}

 	if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) == -1)
 	{
 		release_region(io, 2);
 		return -EINVAL;
 	}
 	printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");

 	mutex_init(&zoltrix_unit.lock);

 	/* mute card - prevents noisy bootups */

 	/* this ensures that the volume is all the way down  */

 	outb(0, io);
 	outb(0, io);
 	msleep(20);
 	inb(io + 3);

 	zoltrix_unit.curvol = 0;
 	zoltrix_unit.stereo = 1;

 	return 0;
 }

 MODULE_AUTHOR("C.van Schaik");
 MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
 MODULE_LICENSE("GPL");

 module_param(io, int, 0);
 MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
 module_param(radio_nr, int, 0);

 static void __exit zoltrix_cleanup_module(void)
 {
 	video_unregister_device(&zoltrix_radio);
 	release_region(io, 2);
 }

 module_init(zoltrix_init);
 module_exit(zoltrix_cleanup_module);
	/* zoltrix radio plus driver for Linux radio support
	* (c) 1998 C. van Schaik <carl@leg.uct.ac.za>
	*
	* BUGS
	* Due to the inconsistency in reading from the signal flags
	* it is difficult to get an accurate tuned signal.
	*
	* It seems that the card is not linear to 0 volume. It cuts off
	* at a low volume, and it is not possible (at least I have not found)
	* to get fine volume control over the low volume range.
	*
	* Some code derived from code by Romolo Manfredini
	* romolo@bicnet.it
	*
	* 1999-05-06 - (C. van Schaik)
	* - Make signal strength and stereo scans
	* kinder to cpu while in delay
	* 1999-01-05 - (C. van Schaik)
	* - Changed tuning to 1/160Mhz accuracy
	* - Added stereo support
	* (card defaults to stereo)
	* (can explicitly force mono on the card)
	* (can detect if station is in stereo)
	* - Added unmute function
	* - Reworked ioctl functions
	* 2002-07-15 - Fix Stereo typo
	*/

	#include <linux/module.h> /* Modules */
	#include <linux/init.h> /* Initdata */
	#include <linux/ioport.h> /* request_region */
	#include <linux/delay.h> /* udelay, msleep */
	#include <asm/io.h> /* outb, outb_p */
	#include <asm/uaccess.h> /* copy to/from user */
	#include <linux/videodev.h> /* kernel radio structs */
	#include <linux/config.h> /* CONFIG_RADIO_ZOLTRIX_PORT */

	#ifndef CONFIG_RADIO_ZOLTRIX_PORT
	#define CONFIG_RADIO_ZOLTRIX_PORT -1
	#endif

	static int io = CONFIG_RADIO_ZOLTRIX_PORT;
	static int radio_nr = -1;

	struct zol_device {
	int port;
	int curvol;
	unsigned long curfreq;
	int muted;
	unsigned int stereo;
	struct mutex lock;
	};

	static int zol_setvol(struct zol_device *dev, int vol)
	{
	dev->curvol = vol;
	if (dev->muted)
	return 0;

	mutex_lock(&dev->lock);
	if (vol == 0) {
	outb(0, io);
	outb(0, io);
	inb(io + 3); /* Zoltrix needs to be read to confirm */
	mutex_unlock(&dev->lock);
	return 0;
	}

	outb(dev->curvol-1, io);
	msleep(10);
	inb(io + 2);
	mutex_unlock(&dev->lock);
	return 0;
	}

	static void zol_mute(struct zol_device *dev)
	{
	dev->muted = 1;
	mutex_lock(&dev->lock);
	outb(0, io);
	outb(0, io);
	inb(io + 3); /* Zoltrix needs to be read to confirm */
	mutex_unlock(&dev->lock);
	}

	static void zol_unmute(struct zol_device *dev)
	{
	dev->muted = 0;
	zol_setvol(dev, dev->curvol);
	}

	static int zol_setfreq(struct zol_device *dev, unsigned long freq)
	{
	/* tunes the radio to the desired frequency */
	unsigned long long bitmask, f, m;
	unsigned int stereo = dev->stereo;
	int i;

	if (freq == 0)
	return 1;
	m = (freq / 160 - 8800) * 2;
	f = (unsigned long long) m + 0x4d1c;

	bitmask = 0xc480402c10080000ull;
	i = 45;

	mutex_lock(&dev->lock);

	outb(0, io);
	outb(0, io);
	inb(io + 3); /* Zoltrix needs to be read to confirm */

	outb(0x40, io);
	outb(0xc0, io);

	bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ ( stereo << 31));
	while (i--) {
	if ((bitmask & 0x8000000000000000ull) != 0) {
	outb(0x80, io);
	udelay(50);
	outb(0x00, io);
	udelay(50);
	outb(0x80, io);
	udelay(50);
	} else {
	outb(0xc0, io);
	udelay(50);
	outb(0x40, io);
	udelay(50);
	outb(0xc0, io);
	udelay(50);
	}
	bitmask *= 2;
	}
	/* termination sequence */
	outb(0x80, io);
	outb(0xc0, io);
	outb(0x40, io);
	udelay(1000);
	inb(io+2);

	udelay(1000);

	if (dev->muted)
	{
	outb(0, io);
	outb(0, io);
	inb(io + 3);
	udelay(1000);
	}

	mutex_unlock(&dev->lock);

	if(!dev->muted)
	{
	zol_setvol(dev, dev->curvol);
	}
	return 0;
	}

	/* Get signal strength */

	static int zol_getsigstr(struct zol_device *dev)
	{
	int a, b;

	mutex_lock(&dev->lock);
	outb(0x00, io); /* This stuff I found to do nothing */
	outb(dev->curvol, io);
	msleep(20);

	a = inb(io);
	msleep(10);
	b = inb(io);

	mutex_unlock(&dev->lock);

	if (a != b)
	return (0);

	if ((a == 0xcf) \|\| (a == 0xdf) /* I found this out by playing */
	\|\| (a == 0xef)) /* with a binary scanner on the card io */
	return (1);
	return (0);
	}

	static int zol_is_stereo (struct zol_device *dev)
	{
	int x1, x2;

	mutex_lock(&dev->lock);

	outb(0x00, io);
	outb(dev->curvol, io);
	msleep(20);

	x1 = inb(io);
	msleep(10);
	x2 = inb(io);

	mutex_unlock(&dev->lock);

	if ((x1 == x2) && (x1 == 0xcf))
	return 1;
	return 0;
	}

	static int zol_do_ioctl(struct inode inode, struct file file,
	unsigned int cmd, void *arg)
	{
	struct video_device *dev = video_devdata(file);
	struct zol_device *zol = dev->priv;

	switch (cmd) {
	case VIDIOCGCAP:
	{
	struct video_capability *v = arg;

	memset(v,0,sizeof(*v));
	v->type = VID_TYPE_TUNER;
	v->channels = 1 + zol->stereo;
	v->audios = 1;
	strcpy(v->name, "Zoltrix Radio");
	return 0;
	}
	case VIDIOCGTUNER:
	{
	struct video_tuner *v = arg;
	if (v->tuner)
	return -EINVAL;
	strcpy(v->name, "FM");
	v->rangelow = (int) (88.0 * 16000);
	v->rangehigh = (int) (108.0 * 16000);
	v->flags = zol_is_stereo(zol)
	? VIDEO_TUNER_STEREO_ON : 0;
	v->flags \|= VIDEO_TUNER_LOW;
	v->mode = VIDEO_MODE_AUTO;
	v->signal = 0xFFFF * zol_getsigstr(zol);
	return 0;
	}
	case VIDIOCSTUNER:
	{
	struct video_tuner *v = arg;
	if (v->tuner != 0)
	return -EINVAL;
	/* Only 1 tuner so no setting needed ! */
	return 0;
	}
	case VIDIOCGFREQ:
	{
	unsigned long *freq = arg;
	*freq = zol->curfreq;
	return 0;
	}
	case VIDIOCSFREQ:
	{
	unsigned long *freq = arg;
	zol->curfreq = *freq;
	zol_setfreq(zol, zol->curfreq);
	return 0;
	}
	case VIDIOCGAUDIO:
	{
	struct video_audio *v = arg;
	memset(v, 0, sizeof(*v));
	v->flags \|= VIDEO_AUDIO_MUTABLE \| VIDEO_AUDIO_VOLUME;
	v->mode \|= zol_is_stereo(zol)
	? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
	v->volume = zol->curvol * 4096;
	v->step = 4096;
	strcpy(v->name, "Zoltrix Radio");
	return 0;
	}
	case VIDIOCSAUDIO:
	{
	struct video_audio *v = arg;
	if (v->audio)
	return -EINVAL;

	if (v->flags & VIDEO_AUDIO_MUTE)
	zol_mute(zol);
	else {
	zol_unmute(zol);
	zol_setvol(zol, v->volume / 4096);
	}

	if (v->mode & VIDEO_SOUND_STEREO) {
	zol->stereo = 1;
	zol_setfreq(zol, zol->curfreq);
	}
	if (v->mode & VIDEO_SOUND_MONO) {
	zol->stereo = 0;
	zol_setfreq(zol, zol->curfreq);
	}
	return 0;
	}
	default:
	return -ENOIOCTLCMD;
	}
	}

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

	static struct zol_device zoltrix_unit;

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

	static struct video_device zoltrix_radio =
	{
	.owner = THIS_MODULE,
	.name = "Zoltrix Radio Plus",
	.type = VID_TYPE_TUNER,
	.hardware = VID_HARDWARE_ZOLTRIX,
	.fops = &zoltrix_fops,
	};

	static int __init zoltrix_init(void)
	{
	if (io == -1) {
	printk(KERN_ERR "You must set an I/O address with io=0x???\n");
	return -EINVAL;
	}
	if ((io != 0x20c) && (io != 0x30c)) {
	printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
	return -ENXIO;
	}

	zoltrix_radio.priv = &zoltrix_unit;
	if (!request_region(io, 2, "zoltrix")) {
	printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
	return -EBUSY;
	}

	if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) == -1)
	{
	release_region(io, 2);
	return -EINVAL;
	}
	printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");

	mutex_init(&zoltrix_unit.lock);

	/* mute card - prevents noisy bootups */

	/* this ensures that the volume is all the way down */

	outb(0, io);
	outb(0, io);
	msleep(20);
	inb(io + 3);

	zoltrix_unit.curvol = 0;
	zoltrix_unit.stereo = 1;

	return 0;
	}

	MODULE_AUTHOR("C.van Schaik");
	MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
	MODULE_LICENSE("GPL");

	module_param(io, int, 0);
	MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
	module_param(radio_nr, int, 0);

	static void __exit zoltrix_cleanup_module(void)
	{
	video_unregister_device(&zoltrix_radio);
	release_region(io, 2);
	}

	module_init(zoltrix_init);
	module_exit(zoltrix_cleanup_module);