/* SF16FMR2 radio driver for Linux radio support
* heavily based on fmi driver...
* (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
*
* Notes on the hardware
*
* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
* No volume control - only mute/unmute - you have to use line volume
*
* For read stereo/mono you must wait 0.1 sec after set frequency and
* card unmuted so I set frequency on unmute
* Signal handling seem to work only on autoscanning (not implemented)
*/
#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 <asm/semaphore.h>
static struct semaphore lock;
#undef DEBUG
//#define DEBUG 1
#ifdef DEBUG
# define debug_print(s) printk s
#else
# define debug_print(s)
#endif
/* this should be static vars for module size */
struct fmr2_device
{
int port;
int curvol; /* 0-65535, if not volume 0 or 65535 */
int mute;
int stereo; /* card is producing stereo audio */
unsigned long curfreq; /* freq in kHz */
int card_type;
__u32 flags;
};
static int io = 0x384;
static int radio_nr = -1;
/* hw precision is 12.5 kHz
* It is only useful to give freq in intervall of 200 (=0.0125Mhz),
* other bits will be truncated
*/
#define RSF16_ENCODE(x) ((x)/200+856)
#define RSF16_MINFREQ 87*16000
#define RSF16_MAXFREQ 108*16000
static inline void wait(int n,int port)
{
for (;n;--n) inb(port);
}
static void outbits(int bits, unsigned int data, int nWait, int port)
{
int bit;
for(;--bits>=0;) {
bit = (data>>bits) & 1;
outb(bit,port);
wait(nWait,port);
outb(bit|2,port);
wait(nWait,port);
outb(bit,port);
wait(nWait,port);
}
}
static inline void fmr2_mute(int port)
{
outb(0x00, port);
wait(4,port);
}
static inline void fmr2_unmute(int port)
{
outb(0x04, port);
wait(4,port);
}
static inline int fmr2_stereo_mode(int port)
{
int n = inb(port);
outb(6,port);
inb(port);
n = ((n>>3)&1)^1;
debug_print((KERN_DEBUG "stereo: %d\n", n));
return n;
}
static int fmr2_product_info(struct fmr2_device *dev)
{
int n = inb(dev->port);
n &= 0xC1;
if (n == 0)
{
/* this should support volume set */
dev->card_type = 12;
return 0;
}
/* not volume (mine is 11) */
dev->card_type = (n==128)?11:0;
return n;
}
static inline int fmr2_getsigstr(struct fmr2_device *dev)
{
/* !!! work only if scanning freq */
int port = dev->port, res = 0xffff;
outb(5,port);
wait(4,port);
if (!(inb(port)&1)) res = 0;
debug_print((KERN_DEBUG "signal: %d\n", res));
return res;
}
/* set frequency and unmute card */
static int fmr2_setfreq(struct fmr2_device *dev)
{
int port = dev->port;
unsigned long freq = dev->curfreq;
fmr2_mute(port);
/* 0x42 for mono output
* 0x102 forward scanning
* 0x182 scansione avanti
*/
outbits(9,0x2,3,port);
outbits(16,RSF16_ENCODE(freq),2,port);
fmr2_unmute(port);
/* wait 0.11 sec */
msleep(110);
/* NOTE if mute this stop radio
you must set freq on unmute */
dev->stereo = fmr2_stereo_mode(port);
return 0;
}
/* !!! not tested, in my card this does't work !!! */
static int fmr2_setvolume(struct fmr2_device *dev)
{
int i,a,n, port = dev->port;
if (dev->card_type != 11) return 1;
switch( (dev->curvol+(1<<11)) >> 12 )
{
case 0: case 1: n = 0x21; break;
case 2: n = 0x84; break;
case 3: n = 0x90; break;
case 4: n = 0x104; break;
case 5: n = 0x110; break;
case 6: n = 0x204; break;
case 7: n = 0x210; break;
case 8: n = 0x402; break;
case 9: n = 0x404; break;
default:
case 10: n = 0x408; break;
case 11: n = 0x410; break;
case 12: n = 0x801; break;
case 13: n = 0x802; break;
case 14: n = 0x804; break;
case 15: n = 0x808; break;
case 16: n = 0x810; break;
}
for(i=12;--i>=0;)
{
a = ((n >> i) & 1) << 6; /* if (a=0) a= 0; else a= 0x40; */
outb(a|4, port);
wait(4,port);
outb(a|0x24, port);
wait(4,port);
outb(a|4, port);
wait(4,port);
}
for(i=6;--i>=0;)
{
a = ((0x18 >> i) & 1) << 6;
outb(a|4, port);
wait(4,port);
outb(a|0x24, port);
wait(4,port);
outb(a|4, port);
wait(4,port);
}
wait(4,port);
outb(0x14, port);
return 0;
}
static int fmr2_do_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, void *arg)
{
struct video_device *dev = video_devdata(file);
struct fmr2_device *fmr2 = dev->priv;
debug_print((KERN_DEBUG "freq %ld flags %d vol %d mute %d "
"stereo %d type %d\n",
fmr2->curfreq, fmr2->flags, fmr2->curvol, fmr2->mute,
fmr2->stereo, fmr2->card_type));
switch(cmd)
{
case VIDIOCGCAP:
{
struct video_capability *v = arg;
memset(v,0,sizeof(*v));
strcpy(v->name, "SF16-FMR2 radio");
v->type=VID_TYPE_TUNER;
v->channels=1;
v->audios=1;
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner *v = arg;
int mult;
if(v->tuner) /* Only 1 tuner */
return -EINVAL;
strcpy(v->name, "FM");
mult = (fmr2->flags & VIDEO_TUNER_LOW) ? 1 : 1000;
v->rangelow = RSF16_MINFREQ/mult;
v->rangehigh = RSF16_MAXFREQ/mult;
v->flags = fmr2->flags | VIDEO_AUDIO_MUTABLE;
if (fmr2->mute)
v->flags |= VIDEO_AUDIO_MUTE;
v->mode=VIDEO_MODE_AUTO;
down(&lock);
v->signal = fmr2_getsigstr(fmr2);
up(&lock);
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner *v = arg;
if (v->tuner!=0)
return -EINVAL;
fmr2->flags = v->flags & VIDEO_TUNER_LOW;
return 0;
}
case VIDIOCGFREQ:
{
unsigned long *freq = arg;
*freq = fmr2->curfreq;
if (!(fmr2->flags & VIDEO_TUNER_LOW))
*freq /= 1000;
return 0;
}
case VIDIOCSFREQ:
{
unsigned long *freq = arg;
if (!(fmr2->flags & VIDEO_TUNER_LOW))
*freq *= 1000;
if ( *freq < RSF16_MINFREQ || *freq > RSF16_MAXFREQ )
return -EINVAL;
/* rounding in steps of 200 to match th freq
* that will be used
*/
fmr2->curfreq = (*freq/200)*200;
/* set card freq (if not muted) */
if (fmr2->curvol && !fmr2->mute)
{
down(&lock);
fmr2_setfreq(fmr2);
up(&lock);
}
return 0;
}
case VIDIOCGAUDIO:
{
struct video_audio *v = arg;
memset(v,0,sizeof(*v));
/* !!! do not return VIDEO_AUDIO_MUTE */
v->flags = VIDEO_AUDIO_MUTABLE;
strcpy(v->name, "Radio");
/* get current stereo mode */
v->mode = fmr2->stereo ? VIDEO_SOUND_STEREO: VIDEO_SOUND_MONO;
/* volume supported ? */
if (fmr2->card_type == 11)
{
v->flags |= VIDEO_AUDIO_VOLUME;
v->step = 1 << 12;
v->volume = fmr2->curvol;
}
debug_print((KERN_DEBUG "Get flags %d vol %d\n", v->flags, v->volume));
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio *v = arg;
if(v->audio)
return -EINVAL;
debug_print((KERN_DEBUG "Set flags %d vol %d\n", v->flags, v->volume));
/* set volume */
if (v->flags & VIDEO_AUDIO_VOLUME)
fmr2->curvol = v->volume; /* !!! set with precision */
if (fmr2->card_type != 11) fmr2->curvol = 65535;
fmr2->mute = 0;
if (v->flags & VIDEO_AUDIO_MUTE)
fmr2->mute = 1;
#ifdef DEBUG
if (fmr2->curvol && !fmr2->mute)
printk(KERN_DEBUG "unmute\n");
else
printk(KERN_DEBUG "mute\n");
#endif
down(&lock);
if (fmr2->curvol && !fmr2->mute)
{
fmr2_setvolume(fmr2);
fmr2_setfreq(fmr2);
}
else fmr2_mute(fmr2->port);
up(&lock);
return 0;
}
case VIDIOCGUNIT:
{
struct video_unit *v = arg;
v->video=VIDEO_NO_UNIT;
v->vbi=VIDEO_NO_UNIT;
v->radio=dev->minor;
v->audio=0; /* How do we find out this??? */
v->teletext=VIDEO_NO_UNIT;
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int fmr2_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, fmr2_do_ioctl);
}
static struct fmr2_device fmr2_unit;
static struct file_operations fmr2_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = fmr2_ioctl,
.compat_ioctl = v4l_compat_ioctl32,
.llseek = no_llseek,
};
static struct video_device fmr2_radio=
{
.owner = THIS_MODULE,
.name = "SF16FMR2 radio",
. type = VID_TYPE_TUNER,
.hardware = VID_HARDWARE_SF16FMR2,
.fops = &fmr2_fops,
};
static int __init fmr2_init(void)
{
fmr2_unit.port = io;
fmr2_unit.curvol = 0;
fmr2_unit.mute = 0;
fmr2_unit.curfreq = 0;
fmr2_unit.stereo = 1;
fmr2_unit.flags = VIDEO_TUNER_LOW;
fmr2_unit.card_type = 0;
fmr2_radio.priv = &fmr2_unit;
init_MUTEX(&lock);
if (request_region(io, 2, "sf16fmr2"))
{
printk(KERN_ERR "fmr2: port 0x%x already in use\n", io);
return -EBUSY;
}
if(video_register_device(&fmr2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
{
release_region(io, 2);
return -EINVAL;
}
printk(KERN_INFO "SF16FMR2 radio card driver at 0x%x.\n", io);
debug_print((KERN_DEBUG "Mute %d Low %d\n",VIDEO_AUDIO_MUTE,VIDEO_TUNER_LOW));
/* mute card - prevents noisy bootups */
down(&lock);
fmr2_mute(io);
fmr2_product_info(&fmr2_unit);
up(&lock);
debug_print((KERN_DEBUG "card_type %d\n", fmr2_unit.card_type));
return 0;
}
MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
MODULE_LICENSE("GPL");
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
module_param(radio_nr, int, 0);
static void __exit fmr2_cleanup_module(void)
{
video_unregister_device(&fmr2_radio);
release_region(io,2);
}
module_init(fmr2_init);
module_exit(fmr2_cleanup_module);
#ifndef MODULE
static int __init fmr2_setup_io(char *str)
{
get_option(&str, &io);
return 1;
}
__setup("sf16fmr2=", fmr2_setup_io);
#endif
