/*
* si470x_start - switch on radio
*/
static int si470x_start(struct si470x_device *radio)
{
int retval;
/* powercfg */
radio->registers[POWERCFG] =
POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
retval = si470x_set_register(radio, POWERCFG);
if (retval < 0)
goto done;
/* sysconfig 1 */
radio->registers[SYSCONFIG1] = SYSCONFIG1_DE;
retval = si470x_set_register(radio, SYSCONFIG1);
if (retval < 0)
goto done;
/* sysconfig 2 */
radio->registers[SYSCONFIG2] =
(0x3f << 8) | /* SEEKTH */
((band << 6) & SYSCONFIG2_BAND) | /* BAND */
((space << 4) & SYSCONFIG2_SPACE) | /* SPACE */
15; /* VOLUME (max) */
retval = si470x_set_register(radio, SYSCONFIG2);
if (retval < 0)
goto done;
/* reset last channel */
retval = si470x_set_chan(radio,
radio->registers[CHANNEL] & CHANNEL_CHAN);
done:
return retval;
}
/*
* si470x_set_freq - set the frequency
*/
static int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
{
unsigned int spacing, band_bottom;
unsigned short chan;
/* Spacing (kHz) */
switch (space) {
/* 0: 200 kHz (USA, Australia) */
case 0 : spacing = 0.200 * FREQ_MUL; break;
/* 1: 100 kHz (Europe, Japan) */
case 1 : spacing = 0.100 * FREQ_MUL; break;
/* 2: 50 kHz */
default: spacing = 0.050 * FREQ_MUL; break;
};
/* Bottom of Band (MHz) */
switch (band) {
/* 0: 87.5 - 108 MHz (USA, Europe) */
case 0 : band_bottom = 87.5 * FREQ_MUL; break;
/* 1: 76 - 108 MHz (Japan wide band) */
default: band_bottom = 76 * FREQ_MUL; break;
/* 2: 76 - 90 MHz (Japan) */
case 2 : band_bottom = 76 * FREQ_MUL; break;
};
/* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
chan = (freq - band_bottom) / spacing;
return si470x_set_chan(radio, chan);
}
/*
* si470x_set_freq - set the frequency
*/
int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
{
unsigned short chan;
freq = clamp(freq, bands[radio->band].rangelow,
bands[radio->band].rangehigh);
/* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
chan = (freq - bands[radio->band].rangelow) / si470x_get_step(radio);
return si470x_set_chan(radio, chan);
}