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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
* Tuner "middleware" for Philips TEA5767 chip
*
* Copyright (C) 2004 Jörg Hohensohn
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdbool.h>
#include <string.h>
#include "tuner.h" /* tuner abstraction interface */
#include "fmradio_i2c.h" /* physical interface driver */
#define I2C_ADR 0xC0
static unsigned char write_bytes[5];
/* tuner abstraction layer: set something to the tuner */
void philips_set(int setting, int value)
{
(void)value;
switch(setting)
{
case RADIO_INIT:
memset(write_bytes, 0, sizeof(write_bytes));
break;
case RADIO_FREQUENCY:
{
int n;
n = (4 * (value - 225000)) / 50000;
write_bytes[0] = (write_bytes[0] & 0xC0) | (n >> 8);
write_bytes[1] = n & 0xFF;
fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
}
break;
case RADIO_MUTE:
write_bytes[0] = (write_bytes[0] & 0x7F) | (value ? 0x80 : 0);
fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
break;
case RADIO_IF_MEASUREMENT:
break;
case RADIO_SENSITIVITY:
break;
case RADIO_FORCE_MONO:
write_bytes[2] = (write_bytes[2] & 0xF7) | (value ? 0x08 : 0);
fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
break;
}
}
/* tuner abstraction layer: read something from the tuner */
int philips_get(int setting)
{
unsigned char read_bytes[5];
int val = -1;
fmradio_i2c_read(I2C_ADR, read_bytes, sizeof(read_bytes));
switch(setting)
{
case RADIO_PRESENT:
val = 1; /* true */
break;
case RADIO_IF_MEASURED:
val = read_bytes[2] & 0x7F;
val = 1070 + (val-55)/2;
break;
case RADIO_STEREO:
val = read_bytes[2] >> 7;
break;
}
return val;
}
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