firmware/drivers/tuner/tea5760uk.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  * Tuner "middleware" for Philips TEA5760UK chip
  10  *
  11  * Copyright (C) 2004 Jörg Hohensohn
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  19  * KIND, either express or implied.
  20  *
  21  ****************************************************************************/
  22 #include "config.h"
  23 #include <stdbool.h>
  24 #include <string.h>
  25 #include <stdlib.h>
  26 #include "kernel.h"
  27 #include "tuner.h" /* tuner abstraction interface */
  28 #include "fmradio.h"
  29 #include "fmradio_i2c.h" /* physical interface driver */
  30
  31 #define I2C_ADR 0x22
  32
  33 /* define RSSI range */
  34 #define RSSI_MIN 4
  35 #define RSSI_MAX 46
  36
  37 static bool tuner_present = false;
  38 static unsigned char write_bytes[7] = {
  39     0x00,   /* INTREG LSB */
  40     0x80,   /* FRQSET MSB */
  41     0x00,   /* FRQSET LSB */
  42     0x08,   /* TNCTRL MSB */
  43     0xD2,   /* TNCTRL LSB */
  44     0x00,   /* TESTREG MSB */
  45     0x40    /* TESTREG LSB */
  46 };
  47
  48 static void tea5760_set_clear(int byte, unsigned char bits, int set)
  49 {
  50     write_bytes[byte] &= ~bits;
  51     if (set)
  52         write_bytes[byte] |= bits;
  53 }
  54
  55 /* tuner abstraction layer: set something to the tuner */
  56 int tea5760_set(int setting, int value)
  57 {
  58     switch(setting)
  59     {
  60         case RADIO_SLEEP:
  61             if (value) {
  62                 /* sleep / standby mode */
  63                 tea5760_set_clear(3, (1<<6), 0);
  64             }
  65             else {
  66                 /* active mode */
  67                 tea5760_set_clear(3, (1<<6), 1);
  68                 /* disable hard mute */
  69                 tea5760_set_clear(4, (1<<7), 0);
  70             }
  71             break;
  72
  73         case RADIO_FREQUENCY:
  74             {
  75                 int n;
  76
  77                 /* low side injection */
  78                 tea5760_set_clear(4, (1<<4), 0);
  79                 n = (4 * (value - 225000) + 16384) / 32768;
  80
  81                 /* set frequency in preset mode */
  82                 write_bytes[1] = (n >> 8) & 0x3F;
  83                 write_bytes[2] = n;
  84             }
  85             break;
  86
  87         case RADIO_SCAN_FREQUENCY:
  88             tea5760_set(RADIO_FREQUENCY, value);
  89             sleep(40*HZ/1000);
  90             return tea5760_get(RADIO_TUNED);
  91
  92         case RADIO_MUTE:
  93             tea5760_set_clear(3, (1<<2), value);
  94             break;
  95
  96         case RADIO_REGION:
  97             {
  98             const struct fm_region_data *rd = &fm_region_data[value];
  99             int band = (rd->freq_min == 76000000) ? 1 : 0;
 100             int deemphasis = (rd->deemphasis == 50) ? 1 : 0;
 101
 102             tea5760_set_clear(3, (1<<5), band);
 103             tea5760_set_clear(4, (1<<1), deemphasis);
 104             }
 105             break;
 106
 107         case RADIO_FORCE_MONO:
 108             tea5760_set_clear(4, (1<<3), value);
 109             break;
 110
 111         default:
 112             return -1;
 113     }
 114
 115     fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
 116     return 1;
 117 }
 118
 119 /* tuner abstraction layer: read something from the tuner */
 120 int tea5760_get(int setting)
 121 {
 122     unsigned char read_bytes[16];
 123     int val = -1; /* default for unsupported query */
 124
 125     fmradio_i2c_read(I2C_ADR, read_bytes, sizeof(read_bytes));
 126
 127     switch(setting)
 128     {
 129         case RADIO_PRESENT:
 130             val = tuner_present ? 1 : 0;
 131             break;
 132
 133         case RADIO_TUNED:
 134             val = 0;
 135             if (read_bytes[0] & (1<<4)) /* IF count correct */
 136             {
 137                 val = read_bytes[8] >> 1; /* IF counter */
 138                 val = (abs(val - 0x36) < 2); /* close match */
 139             }
 140             break;
 141
 142         case RADIO_STEREO:
 143             val = read_bytes[9] >> 2;
 144             break;
 145
 146         case RADIO_RSSI:
 147             val = (read_bytes[9] >> 4) & 0x0F;
 148             val = 4 + (28 * val + 5) / 10;
 149             break;
 150
 151         case RADIO_RSSI_MIN:
 152             val = RSSI_MIN;
 153             break;
 154
 155         case RADIO_RSSI_MAX:
 156             val = RSSI_MAX;
 157             break;
 158     }
 159
 160     return val;
 161 }
 162
 163 void tea5760_init(void)
 164 {
 165     unsigned char buf[16];
 166     unsigned short manid, chipid;
 167
 168     /* read all registers */
 169     fmradio_i2c_read(I2C_ADR, buf, sizeof(buf));
 170
 171     /* check device id */
 172     manid = (buf[12] << 8) | buf[13];
 173     chipid = (buf[14] << 8) | buf[15];
 174     if ((manid == 0x202B) && (chipid == 0x5760))
 175     {
 176         tuner_present = true;
 177     }
 178
 179     /* write initial values */
 180     tea5760_set_clear(3, (1<<1), 1);    /* soft mute on */
 181     tea5760_set_clear(3, (1<<0), 1);    /* stereo noise cancellation on */
 182     fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
 183 }
 184
 185 void tea5760_dbg_info(struct tea5760_dbg_info *info)
 186 {
 187     fmradio_i2c_read(I2C_ADR, info->read_regs, sizeof(info->read_regs));
 188     memcpy(info->write_regs, write_bytes, sizeof(info->write_regs));
 189 }
 190