/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
* (c) 1999 R. Offermanns (rolf@offermanns.de)
* based on the aimslab radio driver from M. Kirkwood
* many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
*
*
* History:
* 1999-05-21 First preview release
*
* Notes on the hardware:
* There are two "main" chips on the card:
* - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
* - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
* (you can get the datasheet at the above links)
*
* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
* Volume Control is done digitally
*
* there is a I2C controlled RDS decoder (SAA6588) onboard, which i would like to support someday
* (as soon i have understand how to get started :)
* If you can help me out with that, please contact me!!
*
*
*/
#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/videodev.h> /* kernel radio structs */
#include <linux/config.h> /* CONFIG_RADIO_TERRATEC_PORT */
#include <linux/spinlock.h>
#ifndef CONFIG_RADIO_TERRATEC_PORT
#define CONFIG_RADIO_TERRATEC_PORT 0x590
#endif
/**************** this ones are for the terratec *******************/
#define BASEPORT 0x590
#define VOLPORT 0x591
#define WRT_DIS 0x00
#define CLK_OFF 0x00
#define IIC_DATA 0x01
#define IIC_CLK 0x02
#define DATA 0x04
#define CLK_ON 0x08
#define WRT_EN 0x10
/*******************************************************************/
static int io = CONFIG_RADIO_TERRATEC_PORT;
static int radio_nr = -1;
static spinlock_t lock;
struct tt_device
{
int port;
int curvol;
unsigned long curfreq;
int muted;
};
/* local things */
static void cardWriteVol(int volume)
{
int i;
volume = volume+(volume * 32); // change both channels
spin_lock(&lock);
for (i=0;i<8;i++)
{
if (volume & (0x80>>i))
outb(0x80, VOLPORT);
else outb(0x00, VOLPORT);
}
spin_unlock(&lock);
}
static void tt_mute(struct tt_device *dev)
{
dev->muted = 1;
cardWriteVol(0);
}
static int tt_setvol(struct tt_device *dev, int vol)
{
// printk(KERN_ERR "setvol called, vol = %d\n", vol);
if(vol == dev->curvol) { /* requested volume = current */
if (dev->muted) { /* user is unmuting the card */
dev->muted = 0;
cardWriteVol(vol); /* enable card */
}
return 0;
}
if(vol == 0) { /* volume = 0 means mute the card */
cardWriteVol(0); /* "turn off card" by setting vol to 0 */
dev->curvol = vol; /* track the volume state! */
return 0;
}
dev->muted = 0;
cardWriteVol(vol);
dev->curvol = vol;
return 0;
}
/* this is the worst part in this driver */
/* many more or less strange things are going on here, but hey, it works :) */
static int tt_setfreq(struct tt_device *dev, unsigned long freq1)
{
int freq;
int i;
int p;
int temp;
long rest;
unsigned char buffer[25]; /* we have to bit shift 25 registers */
freq = freq1/160; /* convert the freq. to a nice to handle value */
for(i=24;i>-1;i--)
buffer[i]=0;
rest = freq*10+10700; /* i once had understood what is going on here */
/* maybe some wise guy (friedhelm?) can comment this stuff */
i=13;
p=10;
temp=102400;
while (rest!=0)
{
if (rest%temp == rest)
buffer[i] = 0;
else
{
buffer[i] = 1;
rest = rest-temp;
}
i--;
p--;
temp = temp/2;
}
spin_lock(&lock);
for (i=24;i>-1;i--) /* bit shift the values to the radiocard */
{
if (buffer[i]==1)
{
outb(WRT_EN|DATA, BASEPORT);
outb(WRT_EN|DATA|CLK_ON , BASEPORT);
outb(WRT_EN|DATA, BASEPORT);
}
else
{
outb(WRT_EN|0x00, BASEPORT);
outb(WRT_EN|0x00|CLK_ON , BASEPORT);
}
}
outb(0x00, BASEPORT);
spin_unlock(&lock);
return 0;
}
static int tt_getsigstr(struct tt_device *dev) /* TODO */
{
if (inb(io) & 2) /* bit set = no signal present */
return 0;
return 1; /* signal present */
}
/* implement the video4linux api */
static int tt_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *dev = video_devdata(file);
struct tt_device *tt=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, "ActiveRadio");
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner *v = arg;
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;
strcpy(v->name, "FM");
v->signal=0xFFFF*tt_getsigstr(tt);
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 = tt->curfreq;
return 0;
}
case VIDIOCSFREQ:
{
unsigned long *freq = arg;
tt->curfreq = *freq;
tt_setfreq(tt, tt->curfreq);
return 0;
}
case VIDIOCGAUDIO:
{
struct video_audio *v = arg;
memset(v,0, sizeof(*v));
v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
v->volume=tt->curvol * 6554;
v->step=6554;
strcpy(v->name, "Radio");
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio *v = arg;
if(v->audio)
return -EINVAL;
if(v->flags&VIDEO_AUDIO_MUTE)
tt_mute(tt);
else
tt_setvol(tt,v->volume/6554);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int tt_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, tt_do_ioctl);
}
static struct tt_device terratec_unit;
static struct file_operations terratec_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = tt_ioctl,
.llseek = no_llseek,
};
static struct video_device terratec_radio=
{
.owner = THIS_MODULE,
.name = "TerraTec ActiveRadio",
.type = VID_TYPE_TUNER,
.hardware = VID_HARDWARE_TERRATEC,
.fops = &terratec_fops,
};
static int __init terratec_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, "terratec"))
{
printk(KERN_ERR "TerraTec: port 0x%x already in use\n", io);
return -EBUSY;
}
terratec_radio.priv=&terratec_unit;
spin_lock_init(&lock);
if(video_register_device(&terratec_radio, VFL_TYPE_RADIO, radio_nr)==-1)
{
release_region(io,2);
return -EINVAL;
}
printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver.\n");
/* mute card - prevents noisy bootups */
/* this ensures that the volume is all the way down */
cardWriteVol(0);
terratec_unit.curvol = 0;
return 0;
}
MODULE_AUTHOR("R.OFFERMANNS & others");
MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
MODULE_LICENSE("GPL");
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the TerraTec ActiveRadio card (0x590 or 0x591)");
module_param(radio_nr, int, 0);
static void __exit terratec_cleanup_module(void)
{
video_unregister_device(&terratec_radio);
release_region(io,2);
printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver unloaded.\n");
}
module_init(terratec_init);
module_exit(terratec_cleanup_module);
