/* 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 "compat.h"#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#endifstatic 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);