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 static bool tuner_present = false;
  34 static unsigned char write_bytes[7] = {
  35     0x00,   /* INTREG LSB */
  36     0x80,   /* FRQSET MSB */
  37     0x00,   /* FRQSET LSB */
  38     0x08,   /* TNCTRL MSB */
  39     0xD2,   /* TNCTRL LSB */
  40     0x00,   /* TESTREG MSB */
  41     0x40    /* TESTREG LSB */
  42 };
  43
  44 static void tea5760_set_clear(int byte, unsigned char bits, int set)
  45 {
  46     write_bytes[byte] &= ~bits;
  47     if (set)
  48         write_bytes[byte] |= bits;
  49 }
  50
  51 /* tuner abstraction layer: set something to the tuner */
  52 int tea5760_set(int setting, int value)
  53 {
  54     switch(setting)
  55     {
  56         case RADIO_SLEEP:
  57             if (value) {
  58                 /* sleep / standby mode */
  59                 tea5760_set_clear(3, (1<<6), 0);
  60             }
  61             else {
  62                 /* active mode */
  63                 tea5760_set_clear(3, (1<<6), 1);
  64                 /* disable hard mute */
  65                 tea5760_set_clear(4, (1<<7), 0);
  66             }
  67             break;
  68
  69         case RADIO_FREQUENCY:
  70             {
  71                 int n;
  72
  73                 /* low side injection */
  74                 tea5760_set_clear(4, (1<<4), 0);
  75                 n = (4 * (value - 225000) + 16384) / 32768;
  76
  77                 /* set frequency in preset mode */
  78                 write_bytes[1] = (n >> 8) & 0x3F;
  79                 write_bytes[2] = n;
  80             }
  81             break;
  82
  83         case RADIO_SCAN_FREQUENCY:
  84             tea5760_set(RADIO_FREQUENCY, value);
  85             sleep(40*HZ/1000);
  86             return tea5760_get(RADIO_TUNED);
  87
  88         case RADIO_MUTE:
  89             tea5760_set_clear(3, (1<<2), value);
  90             break;
  91
  92         case RADIO_REGION:
  93             {
  94             const struct fm_region_data *rd = &fm_region_data[value];
  95             int band = (rd->freq_min == 76000000) ? 1 : 0;
  96             int deemphasis = (rd->deemphasis == 50) ? 1 : 0;
  97
  98             tea5760_set_clear(3, (1<<5), band);
  99             tea5760_set_clear(4, (1<<1), deemphasis);
 100             }
 101             break;
 102
 103         case RADIO_FORCE_MONO:
 104             tea5760_set_clear(4, (1<<3), value);
 105             break;
 106
 107         default:
 108             return -1;
 109     }
 110
 111     fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
 112     return 1;
 113 }
 114
 115 /* tuner abstraction layer: read something from the tuner */
 116 int tea5760_get(int setting)
 117 {
 118     unsigned char read_bytes[16];
 119     int val = -1; /* default for unsupported query */
 120
 121     fmradio_i2c_read(I2C_ADR, read_bytes, sizeof(read_bytes));
 122
 123     switch(setting)
 124     {
 125         case RADIO_PRESENT:
 126             val = tuner_present ? 1 : 0;
 127             break;
 128
 129         case RADIO_TUNED:
 130             val = 0;
 131             if (read_bytes[0] & (1<<4)) /* IF count correct */
 132             {
 133                 val = read_bytes[8] >> 1; /* IF counter */
 134                 val = (abs(val - 0x36) < 2); /* close match */
 135             }
 136             break;
 137
 138         case RADIO_STEREO:
 139             val = read_bytes[9] >> 2;
 140             break;
 141     }
 142
 143     return val;
 144 }
 145
 146 void tea5760_init(void)
 147 {
 148     unsigned char buf[16];
 149     unsigned short manid, chipid;
 150
 151     /* read all registers */
 152     fmradio_i2c_read(I2C_ADR, buf, sizeof(buf));
 153
 154     /* check device id */
 155     manid = (buf[12] << 8) | buf[13];
 156     chipid = (buf[14] << 8) | buf[15];
 157     if ((manid == 0x202B) && (chipid == 0x5760))
 158     {
 159         tuner_present = true;
 160     }
 161
 162     /* write initial values */
 163     tea5760_set_clear(3, (1<<1), 1);    /* soft mute on */
 164     tea5760_set_clear(3, (1<<0), 1);    /* stereo noise cancellation on */
 165     fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
 166 }
 167
 168 void tea5760_dbg_info(struct tea5760_dbg_info *info)
 169 {
 170     fmradio_i2c_read(I2C_ADR, info->read_regs, sizeof(info->read_regs));
 171     memcpy(info->write_regs, write_bytes, sizeof(info->write_regs));
 172 }
 173