181 lines
5.1 KiB
C
181 lines
5.1 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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* Tuner "middleware" for Philips TEA5767 chip
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*
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* Copyright (C) 2004 Jörg Hohensohn
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include <stdbool.h>
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#include <string.h>
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#include <stdlib.h>
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#include "kernel.h"
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#include "tuner.h" /* tuner abstraction interface */
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#include "fmradio.h"
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#include "fmradio_i2c.h" /* physical interface driver */
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#if defined(PHILIPS_HDD1630) || defined(ONDA_VX747) || defined(ONDA_VX777) || defined(PHILIPS_HDD6330)
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#define I2C_ADR 0x60
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#else
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#define I2C_ADR 0xC0
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#endif
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/* define RSSI range */
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#define RSSI_MIN 10
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#define RSSI_MAX 55
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static bool tuner_present = true;
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static unsigned char write_bytes[5] = { 0x00, 0x00, 0x00, 0x00, 0x00 };
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static void tea5767_set_clear(int byte, unsigned char bits, int set)
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{
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write_bytes[byte] &= ~bits;
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if (set)
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write_bytes[byte] |= bits;
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}
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/* tuner abstraction layer: set something to the tuner */
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int tea5767_set(int setting, int value)
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{
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switch(setting)
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{
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case RADIO_SLEEP:
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/* init values */
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write_bytes[0] |= (1<<7); /* mute */
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#if CONFIG_TUNER_XTAL == 32768
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/* 32.768kHz, soft mute, stereo noise cancelling */
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write_bytes[3] |= (1<<4) | (1<<3) | (1<<1);
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#else
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/* soft mute, stereo noise cancelling */
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write_bytes[3] |= (1<<3) | (1<<1);
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#endif
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/* sleep / standby mode */
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tea5767_set_clear(3, (1<<6), value);
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break;
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case RADIO_FREQUENCY:
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{
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int n;
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#if CONFIG_TUNER_XTAL == 32768
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n = (4 * (value - 225000) + 16384) / 32768;
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#else
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n = (4 * (value - 225000)) / 50000;
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#endif
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write_bytes[0] = (write_bytes[0] & 0xC0) | (n >> 8);
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write_bytes[1] = n;
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}
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break;
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case RADIO_SCAN_FREQUENCY:
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tea5767_set(RADIO_FREQUENCY, value);
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sleep(HZ/30);
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return tea5767_get(RADIO_TUNED);
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case RADIO_MUTE:
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tea5767_set_clear(0, 0x80, value);
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break;
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case RADIO_REGION:
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{
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const struct fm_region_data *rd = &fm_region_data[value];
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int deemphasis = (rd->deemphasis == 75) ? 1 : 0;
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int band = (rd->freq_min == 76000000) ? 1 : 0;
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tea5767_set_clear(4, (1<<6), deemphasis);
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tea5767_set_clear(3, (1<<5), band);
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break;
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}
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case RADIO_FORCE_MONO:
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tea5767_set_clear(2, 0x08, value);
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break;
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default:
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return -1;
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}
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fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
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return 1;
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}
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/* tuner abstraction layer: read something from the tuner */
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int tea5767_get(int setting)
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{
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unsigned char read_bytes[5];
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int val = -1; /* default for unsupported query */
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fmradio_i2c_read(I2C_ADR, read_bytes, sizeof(read_bytes));
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switch(setting)
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{
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case RADIO_PRESENT:
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val = tuner_present;
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break;
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case RADIO_TUNED:
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val = 0;
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if (read_bytes[0] & 0x80) /* ready */
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{
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val = read_bytes[2] & 0x7F; /* IF counter */
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val = (abs(val - 0x36) < 2); /* close match */
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}
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break;
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case RADIO_STEREO:
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val = read_bytes[2] >> 7;
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break;
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case RADIO_RSSI:
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val = 10 + 3*(read_bytes[3] >> 4);
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break;
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case RADIO_RSSI_MIN:
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val = RSSI_MIN;
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break;
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case RADIO_RSSI_MAX:
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val = RSSI_MAX;
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break;
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}
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return val;
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}
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void tea5767_init(void)
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{
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/* save binsize by only detecting presence for targets where it may be absent */
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#if defined(PHILIPS_HDD1630) || defined(PHILIPS_HDD6330)
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unsigned char buf[5];
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unsigned char chipid;
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/* init chipid register with 0xFF in case fmradio_i2c_read fails silently */
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buf[3] = 0xFF;
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if (fmradio_i2c_read(I2C_ADR, buf, sizeof(buf)) < 0) {
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/* no i2c device detected */
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tuner_present = false;
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} else {
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/* check chip id */
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chipid = buf[3] & 0x0F;
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tuner_present = (chipid == 0);
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}
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#endif
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}
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void tea5767_dbg_info(struct tea5767_dbg_info *info)
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{
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fmradio_i2c_read(I2C_ADR, info->read_regs, 5);
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memcpy(info->write_regs, write_bytes, 5);
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}
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