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/* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
*
* Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
* Converted to new API by Alan Cox <Alan.Cox@linux.org>
* Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
*
* TODO: Allow for more than one of these foolish entities :-)
*
*/
#include <linux/module.h> /* Modules */
#include <linux/init.h> /* Initdata */
#include <linux/ioport.h> /* check_region, request_region */
#include <linux/delay.h> /* udelay */
#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_RTRACK2_PORT */
#include <linux/spinlock.h>
#ifndef CONFIG_RADIO_RTRACK2_PORT
#define CONFIG_RADIO_RTRACK2_PORT -1
#endif
static int io = CONFIG_RADIO_RTRACK2_PORT;
static int radio_nr = -1;
static spinlock_t lock;
struct rt_device
{
int port;
unsigned long curfreq;
int muted;
};
/* local things */
static void rt_mute(struct rt_device *dev)
{
if(dev->muted)
return;
spin_lock(&lock);
outb(1, io);
spin_unlock(&lock);
dev->muted = 1;
}
static void rt_unmute(struct rt_device *dev)
{
if(dev->muted == 0)
return;
spin_lock(&lock);
outb(0, io);
spin_unlock(&lock);
dev->muted = 0;
}
static void zero(void)
{
outb_p(1, io);
outb_p(3, io);
outb_p(1, io);
}
static void one(void)
{
outb_p(5, io);
outb_p(7, io);
outb_p(5, io);
}
static int rt_setfreq(struct rt_device *dev, unsigned long freq)
{
int i;
freq = freq / 200 + 856;
spin_lock(&lock);
outb_p(0xc8, io);
outb_p(0xc9, io);
outb_p(0xc9, io);
for (i = 0; i < 10; i++)
zero ();
for (i = 14; i >= 0; i--)
if (freq & (1 << i))
one ();
else
zero ();
outb_p(0xc8, io);
if (!dev->muted)
outb_p(0, io);
spin_unlock(&lock);
return 0;
}
static int rt_getsigstr(struct rt_device *dev)
{
if (inb(io) & 2) /* bit set = no signal present */
return 0;
return 1; /* signal present */
}
static int rt_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *dev = video_devdata(file);
struct rt_device *rt=dev->priv;
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability *v = arg;
memset(v,0,sizeof(*v));
v->type=VID_TYPE_TUNER;
v->channels=1;
v->audios=1;
strcpy(v->name, "RadioTrack II");
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner *v = arg;
if(v->tuner) /* Only 1 tuner */
return -EINVAL;
v->rangelow=88*16000;
v->rangehigh=108*16000;
v->flags=VIDEO_TUNER_LOW;
v->mode=VIDEO_MODE_AUTO;
v->signal=0xFFFF*rt_getsigstr(rt);
strcpy(v->name, "FM");
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 = rt->curfreq;
return 0;
}
case VIDIOCSFREQ:
{
unsigned long *freq = arg;
rt->curfreq = *freq;
rt_setfreq(rt, rt->curfreq);
return 0;
}
case VIDIOCGAUDIO:
{
struct video_audio *v = arg;
memset(v,0, sizeof(*v));
v->flags|=VIDEO_AUDIO_MUTABLE;
v->volume=1;
v->step=65535;
strcpy(v->name, "Radio");
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio *v = arg;
if(v->audio)
return -EINVAL;
if(v->flags&VIDEO_AUDIO_MUTE)
rt_mute(rt);
else
rt_unmute(rt);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int rt_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, rt_do_ioctl);
}
static struct rt_device rtrack2_unit;
static struct file_operations rtrack2_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = rt_ioctl,
.llseek = no_llseek,
};
static struct video_device rtrack2_radio=
{
.owner = THIS_MODULE,
.name = "RadioTrack II radio",
.type = VID_TYPE_TUNER,
.hardware = VID_HARDWARE_RTRACK2,
.fops = &rtrack2_fops,
};
static int __init rtrack2_init(void)
{
if(io==-1)
{
printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
return -EINVAL;
}
if (!request_region(io, 4, "rtrack2"))
{
printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
return -EBUSY;
}
rtrack2_radio.priv=&rtrack2_unit;
spin_lock_init(&lock);
if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
{
release_region(io, 4);
return -EINVAL;
}
printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
/* mute card - prevents noisy bootups */
outb(1, io);
rtrack2_unit.muted = 1;
return 0;
}
MODULE_AUTHOR("Ben Pfaff");
MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
MODULE_LICENSE("GPL");
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
module_param(radio_nr, int, 0);
static void __exit rtrack2_cleanup_module(void)
{
video_unregister_device(&rtrack2_radio);
release_region(io,4);
}
module_init(rtrack2_init);
module_exit(rtrack2_cleanup_module);
/*
Local variables:
compile-command: "mmake"
End:
*/
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