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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 "config.h"
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include "kernel.h"
#include "tuner.h" /* tuner abstraction interface */
#include "fmradio_i2c.h" /* physical interface driver */
#define I2C_ADR 0xC0
static unsigned char write_bytes[5] = { 0x00, 0x00, 0x00, 0x00, 0x00 };
/* tuner abstraction layer: set something to the tuner */
void philips_set(int setting, int value)
{
switch(setting)
{
case RADIO_SLEEP:
/* init values */
write_bytes[0] |= (1<<7); /* mute */
#if CONFIG_TUNER_XTAL == 32768
/* 32.768kHz, soft mute, stereo noise cancelling */
write_bytes[3] |= (1<<4) | (1<<3) | (1<<1);
#else
/* soft mute, stereo noise cancelling */
write_bytes[3] |= (1<<3) | (1<<1);
#endif
/* sleep / standby mode */
write_bytes[3] &= ~(1<<6) | (value ? (1<<6) : 0);
break;
case RADIO_FREQUENCY:
{
int n;
#if CONFIG_TUNER_XTAL == 32768
n = (4 * (value - 225000) + 16384) / 32768;
#else
n = (4 * (value - 225000)) / 50000;
#endif
write_bytes[0] = (write_bytes[0] & 0xC0) | (n >> 8);
write_bytes[1] = n & 0xFF;
}
break;
case RADIO_MUTE:
write_bytes[0] = (write_bytes[0] & 0x7F) | (value ? 0x80 : 0);
break;
case RADIO_FORCE_MONO:
write_bytes[2] = (write_bytes[2] & 0xF7) | (value ? 0x08 : 0);
break;
case RADIO_SET_DEEMPHASIS:
write_bytes[4] = (write_bytes[4] & ~(1<<6)) | (value ? (1<<6) : 0);
break;
case RADIO_SET_BAND:
write_bytes[3] = (write_bytes[3] & ~(1<<5)) | (value ? (1<<5) : 0);
default:
return;
}
fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
}
/* tuner abstraction layer: read something from the tuner */
int philips_get(int setting)
{
unsigned char read_bytes[5];
int val = -1; /* default for unsupported query */
fmradio_i2c_read(I2C_ADR, read_bytes, sizeof(read_bytes));
switch(setting)
{
case RADIO_PRESENT:
val = 1; /* true */
break;
case RADIO_TUNED:
val = 0;
if (read_bytes[0] & 0x80) /* ready */
{
val = read_bytes[2] & 0x7F; /* IF counter */
val = (abs(val - 0x36) < 2); /* close match */
}
break;
case RADIO_STEREO:
val = read_bytes[2] >> 7;
break;
case RADIO_ALL: /* debug query */
val = read_bytes[0] << 24
| read_bytes[1] << 16
| read_bytes[2] << 8
| read_bytes[3];
break;
}
return val;
}
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