/* radio-trust.c - Trust FM Radio card driver for Linux 2.2
* by Eric Lammerts <eric@scintilla.utwente.nl>
*
* Based on radio-aztech.c. Original notes:
*
* Adapted to support the Video for Linux API by
* Russell Kroll <rkroll@exploits.org>. Based on original tuner code by:
*
* 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)
*
* The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
*/
#include <stdarg.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/videodev.h>
#include <linux/config.h> /* CONFIG_RADIO_TRUST_PORT */
/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
#ifndef CONFIG_RADIO_TRUST_PORT
#define CONFIG_RADIO_TRUST_PORT -1
#endif
static int io = CONFIG_RADIO_TRUST_PORT;
static int radio_nr = -1;
static int ioval = 0xf;
static __u16 curvol;
static __u16 curbass;
static __u16 curtreble;
static unsigned long curfreq;
static int curstereo;
static int curmute;
/* i2c addresses */
#define TDA7318_ADDR 0x88
#define TSA6060T_ADDR 0xc4
#define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
#define TR_SET_SCL outb(ioval |= 2, io)
#define TR_CLR_SCL outb(ioval &= 0xfd, io)
#define TR_SET_SDA outb(ioval |= 1, io)
#define TR_CLR_SDA outb(ioval &= 0xfe, io)
static void write_i2c(int n, ...)
{
unsigned char val, mask;
va_list args;
va_start(args, n);
/* start condition */
TR_SET_SDA;
TR_SET_SCL;
TR_DELAY;
TR_CLR_SDA;
TR_CLR_SCL;
TR_DELAY;
for(; n; n--) {
val = va_arg(args, unsigned);
for(mask = 0x80; mask; mask >>= 1) {
if(val & mask)
TR_SET_SDA;
else
TR_CLR_SDA;
TR_SET_SCL;
TR_DELAY;
TR_CLR_SCL;
TR_DELAY;
}
/* acknowledge bit */
TR_SET_SDA;
TR_SET_SCL;
TR_DELAY;
TR_CLR_SCL;
TR_DELAY;
}
/* stop condition */
TR_CLR_SDA;
TR_DELAY;
TR_SET_SCL;
TR_DELAY;
TR_SET_SDA;
TR_DELAY;
va_end(args);
}
static void tr_setvol(__u16 vol)
{
curvol = vol / 2048;
write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
}
static int basstreble2chip[15] = {
0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
};
static void tr_setbass(__u16 bass)
{
curbass = bass / 4370;
write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
}
static void tr_settreble(__u16 treble)
{
curtreble = treble / 4370;
write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
}
static void tr_setstereo(int stereo)
{
curstereo = !!stereo;
ioval = (ioval & 0xfb) | (!curstereo << 2);
outb(ioval, io);
}
static void tr_setmute(int mute)
{
curmute = !!mute;
ioval = (ioval & 0xf7) | (curmute << 3);
outb(ioval, io);
}
static int tr_getsigstr(void)
{
int i, v;
for(i = 0, v = 0; i < 100; i++) v |= inb(io);
return (v & 1)? 0 : 0xffff;
}
static int tr_getstereo(void)
{
/* don't know how to determine it, just return the setting */
return curstereo;
}
static void tr_setfreq(unsigned long f)
{
f /= 160; /* Convert to 10 kHz units */
f += 1070; /* Add 10.7 MHz IF */
write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
}
static int tr_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=1;
v->audios=1;
strcpy(v->name, "Trust FM Radio");
return 0;
}
case VIDIOCGTUNER:
{
struct video_tuner *v = arg;
if(v->tuner) /* Only 1 tuner */
return -EINVAL;
v->rangelow = 87500 * 16;
v->rangehigh = 108000 * 16;
v->flags = VIDEO_TUNER_LOW;
v->mode = VIDEO_MODE_AUTO;
v->signal = tr_getsigstr();
if(tr_getstereo())
v->flags |= VIDEO_TUNER_STEREO_ON;
strcpy(v->name, "FM");
return 0;
}
case VIDIOCSTUNER:
{
struct video_tuner *v = arg;
if(v->tuner != 0)
return -EINVAL;
return 0;
}
case VIDIOCGFREQ:
{
unsigned long *freq = arg;
*freq = curfreq;
return 0;
}
case VIDIOCSFREQ:
{
unsigned long *freq = arg;
tr_setfreq(*freq);
return 0;
}
case VIDIOCGAUDIO:
{
struct video_audio *v = arg;
memset(v,0, sizeof(*v));
v->flags = VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME |
VIDEO_AUDIO_BASS | VIDEO_AUDIO_TREBLE;
v->mode = curstereo? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
v->volume = curvol * 2048;
v->step = 2048;
v->bass = curbass * 4370;
v->treble = curtreble * 4370;
strcpy(v->name, "Trust FM Radio");
return 0;
}
case VIDIOCSAUDIO:
{
struct video_audio *v = arg;
if(v->audio)
return -EINVAL;
tr_setvol(v->volume);
tr_setbass(v->bass);
tr_settreble(v->treble);
tr_setstereo(v->mode & VIDEO_SOUND_STEREO);
tr_setmute(v->flags & VIDEO_AUDIO_MUTE);
return 0;
}
default:
return -ENOIOCTLCMD;
}
}
static int tr_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
return video_usercopy(inode, file, cmd, arg, tr_do_ioctl);
}
static struct file_operations trust_fops = {
.owner = THIS_MODULE,
.open = video_exclusive_open,
.release = video_exclusive_release,
.ioctl = tr_ioctl,
.llseek = no_llseek,
};
static struct video_device trust_radio=
{
.owner = THIS_MODULE,
.name = "Trust FM Radio",
.type = VID_TYPE_TUNER,
.hardware = VID_HARDWARE_TRUST,
.fops = &trust_fops,
};
static int __init trust_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, "Trust FM Radio")) {
printk(KERN_ERR "trust: port 0x%x already in use\n", io);
return -EBUSY;
}
if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
{
release_region(io, 2);
return -EINVAL;
}
printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");
write_i2c(2, TDA7318_ADDR, 0x80); /* speaker att. LF = 0 dB */
write_i2c(2, TDA7318_ADDR, 0xa0); /* speaker att. RF = 0 dB */
write_i2c(2, TDA7318_ADDR, 0xc0); /* speaker att. LR = 0 dB */
write_i2c(2, TDA7318_ADDR, 0xe0); /* speaker att. RR = 0 dB */
write_i2c(2, TDA7318_ADDR, 0x40); /* stereo 1 input, gain = 18.75 dB */
tr_setvol(0x8000);
tr_setbass(0x8000);
tr_settreble(0x8000);
tr_setstereo(1);
/* mute card - prevents noisy bootups */
tr_setmute(1);
return 0;
}
MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
MODULE_LICENSE("GPL");
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
module_param(radio_nr, int, 0);
static void __exit cleanup_trust_module(void)
{
video_unregister_device(&trust_radio);
release_region(io, 2);
}
module_init(trust_init);
module_exit(cleanup_trust_module);
