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/* radiotrack (radioreveal) driver for Linux radio support
* (c) 1997 M. Kirkwood
*/
/* 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/config.h>
#include <linux/radio.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include "rtrack.h"
/* Let's just be a bit careful here, shall we? */
#if (CONFIG_RADIO_RTRACK_PORT != 0x20f) && (CONFIG_RADIO_RTRACK_PORT != 0x30f)
#error Invalid port specified for RadioTrack
#endif
/* local prototypes */
void outbits(int bits, int data, int port);
void decvol(int port);
void incvol(int port);
void mute(int port);
void unmute(int port);
/* public structurey-type things */
int rt_port = CONFIG_RADIO_RTRACK_PORT;
struct radio_cap rt_cap = {
0, /* device index (not dealt with here) */
RADIO_TYPE_RTRACK, /* type */
1, /* number of bandwidths */
0, 10 /* volmin, volmax */
};
/* we only get one band/protocol with radiotrack */
struct radio_band rt_band = {
0, /* device index */
0, /* bandwidth "index" */
RADIO_PROTOCOL_FM,
RADIO_BAND_FM_STD,
RADIO_FM_FRTOINT(88.0), /* freq range */
RADIO_FM_FRTOINT(108.0),
0,1 /* sig strength range */
};
/* p'raps these should become struct radio_ops and struct radio_status? */
struct radio_device rt_dev = {
&rt_cap,
&rt_band,
&rt_setvol,
0, /* curvol */
&rt_setband,
0, /* curband */
&rt_setfreq,
0, /* curfreq */
&rt_getsigstr,
NULL, /* next (to be filled in later) */
&rt_port /* misc */
};
void radiotrack_init()
{
int dev_num, i;
/* XXX - probe here?? - XXX */
/* try to grab the i/o port */
if(check_region(rt_port,2)) {
printk("rtrack.c: port 0x%x already used\n", rt_port);
return;
}
request_region(rt_port,2,"rtrack");
dev_num = radio_add_device(&rt_dev);
/* initialise the card */
/* set the volume very low */
for(i=rt_cap.volmax; i>rt_cap.volmin; i--)
decvol(rt_port);
rt_dev.curvol = rt_cap.volmin;
}
int rt_setvol(struct radio_device *dev, int vol)
{
int port, i;
if(vol == dev->curvol)
return 0;
port = *(int*)(dev->misc);
if(vol == 0)
mute(port);
if(vol > dev->curvol)
for(i = dev->curvol; i < vol; i++)
incvol(port);
else
for(i = dev->curvol; i > vol; i--)
decvol(port);
if(dev->curvol == 0)
unmute(port);
return 0;
}
int rt_setband(struct radio_device *dev, int band)
{
/* we know in advance that we only have one band, and
* the wrapper checks the validity of all the inputs
*/
return 0;
}
int rt_setfreq(struct radio_device *dev, int freq)
{
int myport = *(int*)(dev->misc);
outbits(16, RTRACK_ENCODE(freq), myport);
outbits(8, 0xa0, myport);
/* XXX - get rid of this once setvol is implemented properly - XXX */
/* these insist on turning the thing on. not sure I approve... */
udelay(1000);
outb(0, myport);
outb(0xc8, myport);
return 0;
}
int rt_getsigstr(struct radio_device *dev)
{
int res;
int myport = *(int*)(dev->misc);
outb(0xf8, myport);
udelay(200000);
res = (int)inb(myport);
udelay(10000);
outb(0xe8, myport);
if(res == 0xfd)
return 1;
else
return 0;
}
/* local things */
void outbits(int bits, int data, int port)
{
while(bits--) {
if(data & 1) {
outw(5, port);
outw(5, port);
outw(7, port);
outw(7, port);
} else {
outw(1, port);
outw(1, port);
outw(3, port);
outw(3, port);
}
data>>=1;
}
}
void decvol(int port)
{
outb(0x48, port);
udelay(100000);
outb(0xc8, port);
}
void incvol(int port)
{
outb(0x88, port);
udelay(100000);
outb(0xc8, port);
}
void mute(int port)
{
outb(0, port);
outb(0xc0, port);
}
void unmute(int port)
{
outb(0, port);
outb(0xc8, port);
}
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