static void rda5802_set_region(int region)
{
const struct fm_region_data *rd = &fm_region_data[region];
int band = (rd->freq_min == 76000000) ?
CHANNEL_BAND_760_900 : CHANNEL_BAND_870_1080;
int deemphasis = (rd->deemphasis == 50) ? SYSCONFIG1_DE : 0;
uint16_t bandspacing = CHANNEL_BANDw(band) |
CHANNEL_SPACEw(CHANNEL_SPACE_50KHZ);
rda5802_write_masked(SYSCONFIG1, deemphasis, SYSCONFIG1_DE);
rda5802_write_masked(CHANNEL, bandspacing, CHANNEL_BAND | CHANNEL_SPACE);
rda5802_write_cache();
}
static void rda5802_set_region(int region)
{
const struct fm_region_data *rd = &fm_region_data[region];
int band = (rd->freq_min == 76000000) ?
CHANNEL_BAND_760_900 : CHANNEL_BAND_870_1080;
int deemphasis = (rd->deemphasis == 50) ? SYSCONFIG1_DE : 0;
int space = (rd->freq_step == 50000) ?
CHANNEL_SPACE_50KHZ : CHANNEL_SPACE_100KHZ;
rda5802_write_masked(SYSCONFIG1, deemphasis, SYSCONFIG1_DE);
rda5802_write_masked(CHANNEL, CHANNEL_BANDw(band), CHANNEL_BAND);
rda5802_write_masked(CHANNEL, CHANNEL_SPACEw(space), CHANNEL_SPACE);
rda5802_write_cache();
}
static void rda5802_set_frequency(int freq)
{
int i;
uint16_t readchan;
/* check BAND and spacings */
int start = CHANNEL_BANDr(cache[CHANNEL]) & 1 ? 76000000 : 87000000;
int chan = (freq - start) / 50000;
for (i = 0; i < 5; i++) {
/* tune and wait a bit */
rda5802_write_masked(CHANNEL, CHANNEL_CHANw(chan) | CHANNEL_TUNE,
CHANNEL_CHAN | CHANNEL_TUNE);
rda5802_write_cache();
sleep(HZ * 70 / 1000);
rda5802_write_clear(CHANNEL, CHANNEL_TUNE);
rda5802_write_cache();
/* check if tuning was successful */
readchan = rda5802_read_reg(READCHAN);
if (readchan & READCHAN_STC) {
if (READCHAN_READCHANr(readchan) == chan) {
break;
}
}
}
}
static void rda5802_set_frequency(int freq)
{
int i;
uint16_t readchan;
static const int spacings[] = {100000, 200000, 50000, 50000};
static const int bandstart[] = {87000000, 76000000, 76000000, 65000000};
/* calculate channel number */
int start = bandstart[CHANNEL_BANDr(cache[CHANNEL])];
int space = spacings[CHANNEL_SPACEr(cache[CHANNEL])];
int chan = (freq - start) / space;
for (i = 0; i < 5; i++) {
/* tune and wait a bit */
rda5802_write_masked(CHANNEL, CHANNEL_CHANw(chan) | CHANNEL_TUNE,
CHANNEL_CHAN | CHANNEL_TUNE);
rda5802_write_cache();
sleep(HZ * 70 / 1000);
rda5802_write_clear(CHANNEL, CHANNEL_TUNE);
rda5802_write_cache();
/* check if tuning was successful */
readchan = rda5802_read_reg(READCHAN);
if (readchan & READCHAN_STC) {
if (READCHAN_READCHANr(readchan) == chan) {
break;
}
}
}
}
/* tuner abstraction layer: set something to the tuner */
int rda5802_set(int setting, int value)
{
switch (setting) {
case RADIO_SLEEP:
rda5802_sleep(value);
break;
case RADIO_FREQUENCY:
rda5802_set_frequency(value);
break;
case RADIO_SCAN_FREQUENCY:
rda5802_set_frequency(value);
return rda5802_tuned();
case RADIO_MUTE:
rda5802_write_masked(POWERCFG, value ? 0 : POWERCFG_DMUTE,
POWERCFG_DMUTE);
rda5802_write_cache();
break;
case RADIO_REGION:
rda5802_set_region(value);
break;
case RADIO_FORCE_MONO:
rda5802_write_masked(POWERCFG, value ? POWERCFG_MONO : 0,
POWERCFG_MONO);
rda5802_write_cache();
break;
default:
return -1;
}
return 1;
}
