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/* radiotrack (radioreveal) driver for Linux radio support
* (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>
*
* History:
* 1999-02-24 Russell Kroll <rkroll@exploits.org>
* Fine tuning/VIDEO_TUNER_LOW
* Frequency range expanded to start at 87 MHz
*
* TODO: Allow for more than one of these foolish entities :-)
*
* Notes on the hardware (reverse engineered from other peoples'
* reverse engineering of AIMS' code :-)
*
* Frequency control is done digitally -- ie out(port,encodefreq(95.8));
*
* The signal strength query is unsurprisingly inaccurate. And it seems
* to indicate that (on my card, at least) the frequency setting isn't
* too great. (I have to tune up .025MHz from what the freq should be
* to get a report that the thing is tuned.)
*
* Volume control is (ugh) analogue:
* out(port, start_increasing_volume);
* wait(a_wee_while);
* out(port, stop_changing_the_volume);
*
*/
#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_RTRACK_PORT */
#include <asm/semaphore.h> /* Lock for the I/O */
#ifndef CONFIG_RADIO_RTRACK_PORT
#define CONFIG_RADIO_RTRACK_PORT -1
#endif
static int io = CONFIG_RADIO_RTRACK_PORT;
static int radio_nr = -1;
static int users = 0;
static struct semaphore lock;
struct rt_device
{
int port;
int curvol;
unsigned long curfreq;
int muted;
};
/* local things */
static void sleep_delay(long n)
{
/* Sleep nicely for 'n' uS */
int d=n/(1000000/HZ);
if(!d)
udelay(n);
else
{
/* Yield CPU time */
unsigned long x=jiffies;
while((jiffies-x)<=d)
schedule();
}
}
static void rt_decvol(void)
{
outb(0x58, io); /* volume down + sigstr + on */
sleep_delay(100000);
outb(0xd8, io); /* volume steady + sigstr + on */
}
static void rt_incvol(void)
{
outb(0x98, io); /* volume up + sigstr + on */
sleep_delay(100000);
outb(0xd8, io); /* volume steady + sigstr + on */
}
static void rt_mute(struct rt_device *dev)
{
dev->muted = 1;
down(&lock);
outb(0xd0, io); /* volume steady, off */
up(&lock);
}
static int rt_setvol(struct rt_device *dev, int vol)
{
int i;
down(&lock);
if(vol == dev->curvol) { /* requested volume = current */
if (dev->muted) { /* user is unmuting the card */
dev->muted = 0;
outb (0xd8, io); /* enable card */
}
up(&lock);
return 0;
}
if(vol == 0) { /* volume = 0 means mute the card */
outb(0x48, io); /* volume down but still "on" */
sleep_delay(2000000); /* make sure it's totally down */
outb(0xd0, io); /* volume steady, off */
dev->curvol = 0; /* track the volume state! */
up(&lock);
return 0;
}
dev->muted = 0;
if(vol > dev->curvol)
for(i = dev->curvol; i < vol; i++)
rt_incvol();
else
for(i = dev->curvol; i > vol; i--)
rt_decvol();
dev->curvol = vol;
up(&lock);
return 0;
}
/* the 128+64 on these outb's is to keep the volume stable while tuning
* without them, the volume _will_ creep up with each frequency change
* and bit 4 (+16) is to keep the signal strength meter enabled
*/
void send_0_byte(int port, struct rt_device *dev)
{
if ((dev->curvol == 0) || (dev->muted)) {
outb_p(128+64+16+ 1, port); /* wr-enable + data low */
outb_p(128+64+16+2+1, port); /* clock */
}
else {
outb_p(128+64+16+8+ 1, port); /* on + wr-enable + data low */
outb_p(128+64+16+8+2+1, port); /* clock */
}
sleep_delay(1000);
}
void send_1_byte(int port, struct rt_device *dev)
{
if ((dev->curvol == 0) || (dev->muted)) {
outb_p(128+64+16+4 +1, port); /* wr-enable+data high */
outb_p(128+64+16+4+2+1, port); /* clock */
}
else {
outb_p(128+64+16+8+4 +1, port); /* on+wr-enable+data high */
outb_p(128+64+16+8+4+2+1, port); /* clock */
}
sleep_delay(1000);
}
static int rt_setfreq(struct rt_device *dev, unsigned long freq)
{
int i;
/* adapted from radio-aztech.c */
/* now uses VIDEO_TUNER_LOW for fine tuning */
freq += 171200; /* Add 10.7 MHz IF */
freq /= 800; /* Convert to 50 kHz units */
down(&lock); /* Stop other ops interfering */
send_0_byte (io, dev); /* 0: LSB of frequency */
for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
if (freq & (1 << i))
send_1_byte (io, dev);
else
send_0_byte (io, dev);
send_0_byte (io, dev); /* 14: test bit - always 0 */
send_0_byte (io, dev); /* 15: test bit - always 0 */
send_0_byte (io, dev); /* 16: band data 0 - always 0 */
send_0_byte (io, dev); /* 17: band data 1 - always 0 */
send_0_byte (io, dev); /* 18: band data 2 - always 0 */
send_0_byte (io, dev); /* 19: time base - always 0 */
send_0_byte (io, dev); /* 20: spacing (0 = 25 kHz) */
send_1_byte (io, dev); /* 21: spacing (1 = 25 kHz) */
send_0_byte (io, dev); /* 22: spacing (0 = 25 kHz) */
send_1_byte (io, dev); /* 23: AM/FM (FM = 1, always) */
if ((dev->curvol == 0) || (dev->muted))
outb (0xd0, io); /* volume steady + sigstr */
else
outb (0xd8, io); /* volume steady + sigstr + on */
up(&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_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
{
struct rt_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, "RadioTrack");
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;
strcpy(v.name, "FM");
v.signal=0xFFFF*rt_getsigstr(rt);
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;
rt_setfreq(rt, rt->curfreq);
return 0;
case VIDIOCGAUDIO:
{
struct video_audio v;
memset(&v,0, sizeof(v));
v.flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
v.volume=rt->curvol * 6554;
v.step=6554;
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)
rt_mute(rt);
else
rt_setvol(rt,v.volume/6554);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int rt_open(struct video_device *dev, int flags)
{
if(users)
return -EBUSY;
users++;
return 0;
}
static void rt_close(struct video_device *dev)
{
users--;
}
static struct rt_device rtrack_unit;
static struct video_device rtrack_radio=
{
owner: THIS_MODULE,
name: "RadioTrack radio",
type: VID_TYPE_TUNER,
hardware: VID_HARDWARE_RTRACK,
open: rt_open,
close: rt_close,
ioctl: rt_ioctl,
};
static int __init rtrack_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, "rtrack"))
{
printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
return -EBUSY;
}
rtrack_radio.priv=&rtrack_unit;
if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1)
{
release_region(io, 2);
return -EINVAL;
}
printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");
/* Set up the I/O locking */
init_MUTEX(&lock);
/* mute card - prevents noisy bootups */
/* this ensures that the volume is all the way down */
outb(0x48, io); /* volume down but still "on" */
sleep_delay(2000000); /* make sure it's totally down */
outb(0xc0, io); /* steady volume, mute card */
rtrack_unit.curvol = 0;
return 0;
}
MODULE_AUTHOR("M.Kirkwood");
MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
MODULE_LICENSE("GPL");
MODULE_PARM(io, "i");
MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
MODULE_PARM(radio_nr, "i");
EXPORT_NO_SYMBOLS;
static void __exit cleanup_rtrack_module(void)
{
video_unregister_device(&rtrack_radio);
release_region(io,2);
}
module_init(rtrack_init);
module_exit(cleanup_rtrack_module);
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