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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
* Tuner "middleware" for Samsung S1A0903X01 chip
*
* Copyright (C) 2003 Linus Nielsen Feltzing
*
* 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 <stdlib.h>
#include "config.h"
#include "kernel.h"
#include "tuner.h" /* tuner abstraction interface */
#include "fmradio.h" /* physical interface driver */
#include "mpeg.h"
#include "sound.h"
#define DEFAULT_IN1 0x100003 /* Mute */
#define DEFAULT_IN2 0x140884 /* 5kHz, 7.2MHz crystal */
#define PLL_FREQ_STEP 10000
static int fm_in1;
static int fm_in2;
/* tuner abstraction layer: set something to the tuner */
int samsung_set(int setting, int value)
{
int val = 1;
switch(setting)
{
case RADIO_SLEEP:
if (!value)
{ /* wakeup: just unit */
fm_in1 = DEFAULT_IN1;
fm_in2 = DEFAULT_IN2;
fmradio_set(1, fm_in1);
fmradio_set(2, fm_in2);
}
/* else we have no sleep mode? */
break;
case RADIO_FREQUENCY:
{
int pll_cnt;
#if CONFIG_CODEC == MAS3587F
/* Shift the MAS internal clock away for certain frequencies to
* avoid interference. */
int pitch = 1000;
/* 4th harmonic falls in the FM frequency range */
int if_freq = 4 * mpeg_get_mas_pllfreq();
/* shift the mas harmonic >= 300 kHz away using the direction
* which needs less shifting. */
if (value < if_freq)
{
if (if_freq - value < 300000)
pitch = 1003 - (if_freq - value) / 100000;
}
else
{
if (value - if_freq < 300000)
pitch = 997 + (value - if_freq) / 100000;
}
sound_set_pitch(pitch);
#endif
/* We add the standard Intermediate Frequency 10.7MHz
** before calculating the divisor
** The reference frequency is set to 50kHz, and the VCO
** output is prescaled by 2.
*/
pll_cnt = (value + 10700000) / (PLL_FREQ_STEP/2) / 2;
/* 0x100000 == FM mode
** 0x000002 == Microprocessor controlled Mute
*/
fm_in1 = (fm_in1 & 0xfff00007) | (pll_cnt << 3);
fmradio_set(1, fm_in1);
break;
}
case RADIO_SCAN_FREQUENCY:
/* Tune in and delay */
samsung_set(RADIO_FREQUENCY, value);
sleep(1);
/* Start IF measurement */
samsung_set(RADIO_IF_MEASUREMENT, 1);
sleep(1);
val = samsung_get(RADIO_TUNED);
break;
case RADIO_MUTE:
fm_in1 = (fm_in1 & 0xfffffffe) | (value?1:0);
fmradio_set(1, fm_in1);
break;
case RADIO_IF_MEASUREMENT:
fm_in1 = (fm_in1 & 0xfffffffb) | (value?4:0);
fmradio_set(1, fm_in1);
break;
case RADIO_SENSITIVITY:
fm_in2 = (fm_in2 & 0xffff9fff) | ((value & 3) << 13);
fmradio_set(2, fm_in2);
break;
case RADIO_FORCE_MONO:
fm_in2 = (fm_in2 & 0xfffffffb) | (value?0:4);
fmradio_set(2, fm_in2);
break;
default:
val = -1;
}
return val;
}
/* tuner abstraction layer: read something from the tuner */
int samsung_get(int setting)
{
int val = -1;
switch(setting)
{
case RADIO_PRESENT:
fmradio_set(2, 0x140885); /* 5kHz, 7.2MHz crystal, test mode 1 */
val = (fmradio_read(0) == 0x140885);
break;
case RADIO_TUNED:
val = fmradio_read(3);
val = abs(10700 - ((val & 0x7ffff) / 8)) < 50; /* convert to kHz */
break;
case RADIO_STEREO:
val = fmradio_read(3);
val = ((val & 0x100000) ? true : false);
}
return val;
}
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