Viewing file:  radio-gemtek.c (6.58 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
*
* GemTek hasn't released any specs on the card, so the protocol had to
* be reverse engineered with dosemu.
*
* Besides the protocol changes, this is mostly a copy of:
*
* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
*
* Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
* Coverted 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_GEMTEK_PORT */
#include <linux/spinlock.h>
#ifndef CONFIG_RADIO_GEMTEK_PORT
#define CONFIG_RADIO_GEMTEK_PORT -1
#endif
static int io = CONFIG_RADIO_GEMTEK_PORT;
static int radio_nr = -1;
static int users = 0;
static spinlock_t lock;
struct gemtek_device
{
int port;
unsigned long curfreq;
int muted;
};
/* local things */
/* the correct way to mute the gemtek may be to write the last written
* frequency || 0x10, but just writing 0x10 once seems to do it as well
*/
static void gemtek_mute(struct gemtek_device *dev)
{
if(dev->muted)
return;
spin_lock(&lock);
outb(0x10, io);
spin_unlock(&lock);
dev->muted = 1;
}
static void gemtek_unmute(struct gemtek_device *dev)
{
if(dev->muted == 0)
return;
spin_lock(&lock);
outb(0x20, io);
spin_unlock(&lock);
dev->muted = 0;
}
static void zero(void)
{
outb_p(0x04, io);
udelay(5);
outb_p(0x05, io);
udelay(5);
}
static void one(void)
{
outb_p(0x06, io);
udelay(5);
outb_p(0x07, io);
udelay(5);
}
static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
{
int i;
/* freq = 78.25*((float)freq/16000.0 + 10.52); */
freq /= 16;
freq += 10520;
freq *= 7825;
freq /= 100000;
spin_lock(&lock);
/* 2 start bits */
outb_p(0x03, io);
udelay(5);
outb_p(0x07, io);
udelay(5);
/* 28 frequency bits (lsb first) */
for (i = 0; i < 14; i++)
if (freq & (1 << i))
one();
else
zero();
/* 36 unknown bits */
for (i = 0; i < 11; i++)
zero();
one();
for (i = 0; i < 4; i++)
zero();
one();
zero();
/* 2 end bits */
outb_p(0x03, io);
udelay(5);
outb_p(0x07, io);
udelay(5);
spin_unlock(&lock);
return 0;
}
int gemtek_getsigstr(struct gemtek_device *dev)
{
spin_lock(&lock);
inb(io);
udelay(5);
spin_unlock(&lock);
if (inb(io) & 8) /* bit set = no signal present */
return 0;
return 1; /* signal present */
}
static int gemtek_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
{
struct gemtek_device *rt=dev->priv;
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability v;
v.type=VID_TYPE_TUNER;
v.channels=1;
v.audios=1;
/* No we don't do pictures */
v.maxwidth=0;
v.maxheight=0;
v.minwidth=0;
v.minheight=0;
strcpy(v.name, "GemTek");
if(copy_to_user(arg,&v,sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner v;
if(copy_from_user(&v, arg,sizeof(v))!=0)
return -EFAULT;
if(v.tuner) /* Only 1 tuner */
return -EINVAL;
v.rangelow=87*16000;
v.rangehigh=108*16000;
v.flags=VIDEO_TUNER_LOW;
v.mode=VIDEO_MODE_AUTO;
v.signal=0xFFFF*gemtek_getsigstr(rt);
strcpy(v.name, "FM");
if(copy_to_user(arg,&v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner v;
if(copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;
if(v.tuner!=0)
return -EINVAL;
/* Only 1 tuner so no setting needed ! */
return 0;
}
case VIDIOCGFREQ:
if(copy_to_user(arg, &rt->curfreq, sizeof(rt->curfreq)))
return -EFAULT;
return 0;
case VIDIOCSFREQ:
if(copy_from_user(&rt->curfreq, arg,sizeof(rt->curfreq)))
return -EFAULT;
/* needs to be called twice in order for getsigstr to work */
gemtek_setfreq(rt, rt->curfreq);
gemtek_setfreq(rt, rt->curfreq);
return 0;
case VIDIOCGAUDIO:
{
struct video_audio v;
memset(&v,0, sizeof(v));
v.flags|=VIDEO_AUDIO_MUTABLE;
v.volume=1;
v.step=65535;
strcpy(v.name, "Radio");
if(copy_to_user(arg,&v, sizeof(v)))
return -EFAULT;
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio v;
if(copy_from_user(&v, arg, sizeof(v)))
return -EFAULT;
if(v.audio)
return -EINVAL;
if(v.flags&VIDEO_AUDIO_MUTE)
gemtek_mute(rt);
else
gemtek_unmute(rt);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int gemtek_open(struct video_device *dev, int flags)
{
if(users)
return -EBUSY;
users++;
return 0;
}
static void gemtek_close(struct video_device *dev)
{
users--;
}
static struct gemtek_device gemtek_unit;
static struct video_device gemtek_radio=
{
owner: THIS_MODULE,
name: "GemTek radio",
type: VID_TYPE_TUNER,
hardware: VID_HARDWARE_GEMTEK,
open: gemtek_open,
close: gemtek_close,
ioctl: gemtek_ioctl,
};
static int __init gemtek_init(void)
{
if(io==-1)
{
printk(KERN_ERR "You must set an I/O address with io=0x20c, io=0x30c, io=0x24c or io=0x34c (io=0x020c or io=0x248 for the combined sound/radiocard)\n");
return -EINVAL;
}
if (!request_region(io, 4, "gemtek"))
{
printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
return -EBUSY;
}
gemtek_radio.priv=&gemtek_unit;
if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
{
release_region(io, 4);
return -EINVAL;
}
printk(KERN_INFO "GemTek Radio Card driver.\n");
spin_lock_init(&lock);
/* mute card - prevents noisy bootups */
outb(0x10, io);
udelay(5);
gemtek_unit.muted = 1;
/* this is _maybe_ unnecessary */
outb(0x01, io);
return 0;
}
MODULE_AUTHOR("Jonas Munsin");
MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
MODULE_LICENSE("GPL");
MODULE_PARM(io, "i");
MODULE_PARM_DESC(io, "I/O address of the GemTek card (0x20c, 0x30c, 0x24c or 0x34c (0x20c or 0x248 have been reported to work for the combined sound/radiocard)).");
MODULE_PARM(radio_nr, "i");
EXPORT_NO_SYMBOLS;
static void __exit gemtek_cleanup(void)
{
video_unregister_device(&gemtek_radio);
release_region(io,4);
}
module_init(gemtek_init);
module_exit(gemtek_cleanup);
/*
Local variables:
compile-command: "gcc -c -DMODVERSIONS -D__KERNEL__ -DMODULE -O6 -Wall -Wstrict-prototypes -I /home/blp/tmp/linux-2.1.111-rtrack/include radio-rtrack2.c"
End:
*/
|