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linux/drivers/media/radio/radio-cadet.c

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/* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
*
* by Fred Gleason <fredg@wava.com>
* Version 0.3.3
*
* (Loosely) based on code for the Aztech radio card by
*
* Russell Kroll (rkroll@exploits.org)
* Quay Ly
* Donald Song
* Jason Lewis (jlewis@twilight.vtc.vsc.edu)
* Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
* William McGrath (wmcgrath@twilight.vtc.vsc.edu)
*
* History:
* 2000-04-29 Russell Kroll <rkroll@exploits.org>
* Added ISAPnP detection for Linux 2.3/2.4
*
* 2001-01-10 Russell Kroll <rkroll@exploits.org>
* Removed dead CONFIG_RADIO_CADET_PORT code
* PnP detection on load is now default (no args necessary)
*
* 2002-01-17 Adam Belay <ambx1@neo.rr.com>
* Updated to latest pnp code
*
* 2003-01-31 Alan Cox <alan@redhat.com>
* Cleaned up locking, delay code, general odds and ends
*/
#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/param.h>
#include <linux/pnp.h>
#define RDS_BUFFER 256
static int io=-1; /* default to isapnp activation */
static int radio_nr = -1;
static int users=0;
static int curtuner=0;
static int tunestat=0;
static int sigstrength=0;
static wait_queue_head_t read_queue;
static struct timer_list readtimer;
static __u8 rdsin=0,rdsout=0,rdsstat=0;
static unsigned char rdsbuf[RDS_BUFFER];
static spinlock_t cadet_io_lock;
static int cadet_probe(void);
/*
* Signal Strength Threshold Values
* The V4L API spec does not define any particular unit for the signal
* strength value. These values are in microvolts of RF at the tuner's input.
*/
static __u16 sigtable[2][4]={{5,10,30,150},{28,40,63,1000}};
static int cadet_getrds(void)
{
int rdsstat=0;
spin_lock(&cadet_io_lock);
outb(3,io); /* Select Decoder Control/Status */
outb(inb(io+1)&0x7f,io+1); /* Reset RDS detection */
spin_unlock(&cadet_io_lock);
msleep(100);
spin_lock(&cadet_io_lock);
outb(3,io); /* Select Decoder Control/Status */
if((inb(io+1)&0x80)!=0) {
rdsstat|=VIDEO_TUNER_RDS_ON;
}
if((inb(io+1)&0x10)!=0) {
rdsstat|=VIDEO_TUNER_MBS_ON;
}
spin_unlock(&cadet_io_lock);
return rdsstat;
}
static int cadet_getstereo(void)
{
int ret = 0;
if(curtuner != 0) /* Only FM has stereo capability! */
return 0;
spin_lock(&cadet_io_lock);
outb(7,io); /* Select tuner control */
if( (inb(io+1) & 0x40) == 0)
ret = 1;
spin_unlock(&cadet_io_lock);
return ret;
}
static unsigned cadet_gettune(void)
{
int curvol,i;
unsigned fifo=0;
/*
* Prepare for read
*/
spin_lock(&cadet_io_lock);
outb(7,io); /* Select tuner control */
curvol=inb(io+1); /* Save current volume/mute setting */
outb(0x00,io+1); /* Ensure WRITE-ENABLE is LOW */
tunestat=0xffff;
/*
* Read the shift register
*/
for(i=0;i<25;i++) {
fifo=(fifo<<1)|((inb(io+1)>>7)&0x01);
if(i<24) {
outb(0x01,io+1);
tunestat&=inb(io+1);
outb(0x00,io+1);
}
}
/*
* Restore volume/mute setting
*/
outb(curvol,io+1);
spin_unlock(&cadet_io_lock);
return fifo;
}
static unsigned cadet_getfreq(void)
{
int i;
unsigned freq=0,test,fifo=0;
/*
* Read current tuning
*/
fifo=cadet_gettune();
/*
* Convert to actual frequency
*/
if(curtuner==0) { /* FM */
test=12500;
for(i=0;i<14;i++) {
if((fifo&0x01)!=0) {
freq+=test;
}
test=test<<1;
fifo=fifo>>1;
}
freq-=10700000; /* IF frequency is 10.7 MHz */
freq=(freq*16)/1000000; /* Make it 1/16 MHz */
}
if(curtuner==1) { /* AM */
freq=((fifo&0x7fff)-2010)*16;
}
return freq;
}
static void cadet_settune(unsigned fifo)
{
int i;
unsigned test;
spin_lock(&cadet_io_lock);
outb(7,io); /* Select tuner control */
/*
* Write the shift register
*/
test=0;
test=(fifo>>23)&0x02; /* Align data for SDO */
test|=0x1c; /* SDM=1, SWE=1, SEN=1, SCK=0 */
outb(7,io); /* Select tuner control */
outb(test,io+1); /* Initialize for write */
for(i=0;i<25;i++) {
test|=0x01; /* Toggle SCK High */
outb(test,io+1);
test&=0xfe; /* Toggle SCK Low */
outb(test,io+1);
fifo=fifo<<1; /* Prepare the next bit */
test=0x1c|((fifo>>23)&0x02);
outb(test,io+1);
}
spin_unlock(&cadet_io_lock);
}
static void cadet_setfreq(unsigned freq)
{
unsigned fifo;
int i,j,test;
int curvol;
/*
* Formulate a fifo command
*/
fifo=0;
if(curtuner==0) { /* FM */
test=102400;
freq=(freq*1000)/16; /* Make it kHz */
freq+=10700; /* IF is 10700 kHz */
for(i=0;i<14;i++) {
fifo=fifo<<1;
if(freq>=test) {
fifo|=0x01;
freq-=test;
}
test=test>>1;
}
}
if(curtuner==1) { /* AM */
fifo=(freq/16)+2010; /* Make it kHz */
fifo|=0x100000; /* Select AM Band */
}
/*
* Save current volume/mute setting
*/
spin_lock(&cadet_io_lock);
outb(7,io); /* Select tuner control */
curvol=inb(io+1);
spin_unlock(&cadet_io_lock);
/*
* Tune the card
*/
for(j=3;j>-1;j--) {
cadet_settune(fifo|(j<<16));
spin_lock(&cadet_io_lock);
outb(7,io); /* Select tuner control */
outb(curvol,io+1);
spin_unlock(&cadet_io_lock);
msleep(100);
cadet_gettune();
if((tunestat & 0x40) == 0) { /* Tuned */
sigstrength=sigtable[curtuner][j];
return;
}
}
sigstrength=0;
}
static int cadet_getvol(void)
{
int ret = 0;
spin_lock(&cadet_io_lock);
outb(7,io); /* Select tuner control */
if((inb(io + 1) & 0x20) != 0)
ret = 0xffff;
spin_unlock(&cadet_io_lock);
return ret;
}
static void cadet_setvol(int vol)
{
spin_lock(&cadet_io_lock);
outb(7,io); /* Select tuner control */
if(vol>0)
outb(0x20,io+1);
else
outb(0x00,io+1);
spin_unlock(&cadet_io_lock);
}
static void cadet_handler(unsigned long data)
{
/*
* Service the RDS fifo
*/
if(spin_trylock(&cadet_io_lock))
{
outb(0x3,io); /* Select RDS Decoder Control */
if((inb(io+1)&0x20)!=0) {
printk(KERN_CRIT "cadet: RDS fifo overflow\n");
}
outb(0x80,io); /* Select RDS fifo */
while((inb(io)&0x80)!=0) {
rdsbuf[rdsin]=inb(io+1);
if(rdsin==rdsout)
printk(KERN_WARNING "cadet: RDS buffer overflow\n");
else
rdsin++;
}
spin_unlock(&cadet_io_lock);
}
/*
* Service pending read
*/
if( rdsin!=rdsout)
wake_up_interruptible(&read_queue);
/*
* Clean up and exit
*/
init_timer(&readtimer);
readtimer.function=cadet_handler;
readtimer.data=(unsigned long)0;
readtimer.expires=jiffies+(HZ/20);
add_timer(&readtimer);
}
static ssize_t cadet_read(struct file *file, char __user *data,
size_t count, loff_t *ppos)
{
int i=0;
unsigned char readbuf[RDS_BUFFER];
if(rdsstat==0) {
spin_lock(&cadet_io_lock);
rdsstat=1;
outb(0x80,io); /* Select RDS fifo */
spin_unlock(&cadet_io_lock);
init_timer(&readtimer);
readtimer.function=cadet_handler;
readtimer.data=(unsigned long)0;
readtimer.expires=jiffies+(HZ/20);
add_timer(&readtimer);
}
if(rdsin==rdsout) {
if (file->f_flags & O_NONBLOCK)
return -EWOULDBLOCK;
interruptible_sleep_on(&read_queue);
}
while( i<count && rdsin!=rdsout)
readbuf[i++]=rdsbuf[rdsout++];
if (copy_to_user(data,readbuf,i))
return -EFAULT;
return i;
}
static int cadet_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability *v = arg;
memset(v,0,sizeof(*v));
v->type=VID_TYPE_TUNER;
v->channels=2;
v->audios=1;
strcpy(v->name, "ADS Cadet");
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner *v = arg;
if((v->tuner<0)||(v->tuner>1)) {
return -EINVAL;
}
switch(v->tuner) {
case 0:
strcpy(v->name,"FM");
v->rangelow=1400; /* 87.5 MHz */
v->rangehigh=1728; /* 108.0 MHz */
v->flags=0;
v->mode=0;
v->mode|=VIDEO_MODE_AUTO;
v->signal=sigstrength;
if(cadet_getstereo()==1) {
v->flags|=VIDEO_TUNER_STEREO_ON;
}
v->flags|=cadet_getrds();
break;
case 1:
strcpy(v->name,"AM");
v->rangelow=8320; /* 520 kHz */
v->rangehigh=26400; /* 1650 kHz */
v->flags=0;
v->flags|=VIDEO_TUNER_LOW;
v->mode=0;
v->mode|=VIDEO_MODE_AUTO;
v->signal=sigstrength;
break;
}
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner *v = arg;
if((v->tuner<0)||(v->tuner>1)) {
return -EINVAL;
}
curtuner=v->tuner;
return 0;
}
case VIDIOCGFREQ:
{
unsigned long *freq = arg;
*freq = cadet_getfreq();
return 0;
}
case VIDIOCSFREQ:
{
unsigned long *freq = arg;
if((curtuner==0)&&((*freq<1400)||(*freq>1728))) {
return -EINVAL;
}
if((curtuner==1)&&((*freq<8320)||(*freq>26400))) {
return -EINVAL;
}
cadet_setfreq(*freq);
return 0;
}
case VIDIOCGAUDIO:
{
struct video_audio *v = arg;
memset(v,0, sizeof(*v));
v->flags=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
if(cadet_getstereo()==0) {
v->mode=VIDEO_SOUND_MONO;
} else {
v->mode=VIDEO_SOUND_STEREO;
}
v->volume=cadet_getvol();
v->step=0xffff;
strcpy(v->name, "Radio");
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio *v = arg;
if(v->audio)
return -EINVAL;
cadet_setvol(v->volume);
if(v->flags&VIDEO_AUDIO_MUTE)
cadet_setvol(0);
else
cadet_setvol(0xffff);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int cadet_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, cadet_do_ioctl);
}
static int cadet_open(struct inode *inode, struct file *file)
{
if(users)
return -EBUSY;
users++;
init_waitqueue_head(&read_queue);
return 0;
}
static int cadet_release(struct inode *inode, struct file *file)
{
del_timer_sync(&readtimer);
rdsstat=0;
users--;
return 0;
}
static struct file_operations cadet_fops = {
.owner = THIS_MODULE,
.open = cadet_open,
.release = cadet_release,
.read = cadet_read,
.ioctl = cadet_ioctl,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek,
};
static struct video_device cadet_radio=
{
.owner = THIS_MODULE,
.name = "Cadet radio",
.type = VID_TYPE_TUNER,
.hardware = VID_HARDWARE_CADET,
.fops = &cadet_fops,
};
static struct pnp_device_id cadet_pnp_devices[] = {
/* ADS Cadet AM/FM Radio Card */
{.id = "MSM0c24", .driver_data = 0},
{.id = ""}
};
MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
static int cadet_pnp_probe(struct pnp_dev * dev, const struct pnp_device_id *dev_id)
{
if (!dev)
return -ENODEV;
/* only support one device */
if (io > 0)
return -EBUSY;
if (!pnp_port_valid(dev, 0)) {
return -ENODEV;
}
io = pnp_port_start(dev, 0);
printk ("radio-cadet: PnP reports device at %#x\n", io);
return io;
}
static struct pnp_driver cadet_pnp_driver = {
.name = "radio-cadet",
.id_table = cadet_pnp_devices,
.probe = cadet_pnp_probe,
.remove = NULL,
};
static int cadet_probe(void)
{
static int iovals[8]={0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e};
int i;
for(i=0;i<8;i++) {
io=iovals[i];
if (request_region(io, 2, "cadet-probe")) {
cadet_setfreq(1410);
if(cadet_getfreq()==1410) {
release_region(io, 2);
return io;
}
release_region(io, 2);
}
}
return -1;
}
/*
* io should only be set if the user has used something like
* isapnp (the userspace program) to initialize this card for us
*/
static int __init cadet_init(void)
{
spin_lock_init(&cadet_io_lock);
/*
* If a probe was requested then probe ISAPnP first (safest)
*/
if (io < 0)
pnp_register_driver(&cadet_pnp_driver);
/*
* If that fails then probe unsafely if probe is requested
*/
if(io < 0)
io = cadet_probe ();
/*
* Else we bail out
*/
if(io < 0) {
#ifdef MODULE
printk(KERN_ERR "You must set an I/O address with io=0x???\n");
#endif
goto fail;
}
if (!request_region(io,2,"cadet"))
goto fail;
if(video_register_device(&cadet_radio,VFL_TYPE_RADIO,radio_nr)==-1) {
release_region(io,2);
goto fail;
}
printk(KERN_INFO "ADS Cadet Radio Card at 0x%x\n",io);
return 0;
fail:
pnp_unregister_driver(&cadet_pnp_driver);
return -1;
}
MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
MODULE_LICENSE("GPL");
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
module_param(radio_nr, int, 0);
static void __exit cadet_cleanup_module(void)
{
video_unregister_device(&cadet_radio);
release_region(io,2);
pnp_unregister_driver(&cadet_pnp_driver);
}
module_init(cadet_init);
module_exit(cadet_cleanup_module);
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