diff options
| author | Igor M. Liplianin <liplianin@me.by> | 2011-02-26 00:41:24 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2011-03-22 02:32:27 +0300 |
| commit | a5bf834b4a29b0c7f813ce1c456563c470d4181f (patch) | |
| tree | 2db2e70b90b8f6327fef5f81470ef5b5b161897f /drivers/media/dvb/frontends/ds3000.c | |
| parent | cb8f74da107cf593eb50ac4968faaa5f49fbad4a (diff) | |
| download | linux-a5bf834b4a29b0c7f813ce1c456563c470d4181f.tar.xz | |
[media] ds3000: add carrier offset calculation
Signed-off-by: Igor M. Liplianin <liplianin@me.by>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/frontends/ds3000.c')
| -rw-r--r-- | drivers/media/dvb/frontends/ds3000.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/drivers/media/dvb/frontends/ds3000.c b/drivers/media/dvb/frontends/ds3000.c index 13f9193d4f4a..a0bf70f0d044 100644 --- a/drivers/media/dvb/frontends/ds3000.c +++ b/drivers/media/dvb/frontends/ds3000.c @@ -948,6 +948,25 @@ static int ds3000_get_property(struct dvb_frontend *fe, return 0; } +static int ds3000_set_carrier_offset(struct dvb_frontend *fe, + s32 carrier_offset_khz) +{ + struct ds3000_state *state = fe->demodulator_priv; + s32 tmp; + + tmp = carrier_offset_khz; + tmp *= 65536; + tmp = (2 * tmp + DS3000_SAMPLE_RATE) / (2 * DS3000_SAMPLE_RATE); + + if (tmp < 0) + tmp += 65536; + + ds3000_writereg(state, 0x5f, tmp >> 8); + ds3000_writereg(state, 0x5e, tmp & 0xff); + + return 0; +} + static int ds3000_tune(struct dvb_frontend *fe, struct dvb_frontend_parameters *p) { @@ -955,7 +974,8 @@ static int ds3000_tune(struct dvb_frontend *fe, struct dtv_frontend_properties *c = &fe->dtv_property_cache; int i; - u8 status, mlpf, mlpf_new, mlpf_max, mlpf_min, nlpf; + u8 status, mlpf, mlpf_new, mlpf_max, mlpf_min, nlpf, div4; + s32 offset_khz; u16 value, ndiv; u32 f3db; @@ -970,9 +990,12 @@ static int ds3000_tune(struct dvb_frontend *fe, ds3000_tuner_writereg(state, 0x60, 0x79); ds3000_tuner_writereg(state, 0x08, 0x01); ds3000_tuner_writereg(state, 0x00, 0x01); + div4 = 0; + /* calculate and set freq divider */ if (p->frequency < 1146000) { ds3000_tuner_writereg(state, 0x10, 0x11); + div4 = 1; ndiv = ((p->frequency * (6 + 8) * 4) + (DS3000_XTAL_FREQ / 2)) / DS3000_XTAL_FREQ - 1024; @@ -1076,6 +1099,9 @@ static int ds3000_tune(struct dvb_frontend *fe, ds3000_tuner_writereg(state, 0x50, 0x00); msleep(60); + offset_khz = (ndiv - ndiv % 2 + 1024) * DS3000_XTAL_FREQ + / (6 + 8) / (div4 + 1) / 2 - p->frequency; + /* ds3000 global reset */ ds3000_writereg(state, 0x07, 0x80); ds3000_writereg(state, 0x07, 0x00); @@ -1179,7 +1205,7 @@ static int ds3000_tune(struct dvb_frontend *fe, /* start ds3000 build-in uC */ ds3000_writereg(state, 0xb2, 0x00); - /* TODO: calculate and set carrier offset */ + ds3000_set_carrier_offset(fe, offset_khz); for (i = 0; i < 30 ; i++) { ds3000_read_status(fe, &status); |