From ee33c525c4d09756156cd4c18e6586da900eb310 Mon Sep 17 00:00:00 2001 From: Steven Toth Date: Thu, 11 Sep 2008 23:52:32 -0300 Subject: V4L/DVB (8999): S2API: Reduce demod driver complexity by using a cache sync For demod drivers, we want a single tuning function (set_frontend) to have access to the properly constructed dvb_frontend_parameters structure, or the cache values - regardless of whether the legacy or new API is being used. This cuts down on redundant code in the demod drivers and ensures the tuning parameters are consistent regardless of the API entry type. Signed-off-by: Steven Toth Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb/dvb-core/dvb_frontend.c | 38 +++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) (limited to 'drivers/media/dvb/dvb-core') diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c index ce1de403e99..7e9cd792131 100644 --- a/drivers/media/dvb/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb/dvb-core/dvb_frontend.c @@ -993,6 +993,42 @@ int is_legacy_delivery_system(fe_delivery_system_t s) return 0; } +/* Synchronise the legacy tuning parameters into the cache, so that demodulator + * drivers can use a single set_frontend tuning function, regardless of whether + * it's being used for the legacy or new API, reducing code and complexity. + */ +void dtv_property_cache_sync(struct dvb_frontend *fe, struct dvb_frontend_parameters *p) +{ + struct dtv_frontend_properties *c = &fe->dtv_property_cache; + + c->frequency = p->frequency; + c->inversion = p->inversion; + + switch (fe->ops.info.type) { + case FE_QPSK: + c->symbol_rate = p->u.qpsk.symbol_rate; + c->fec_inner = p->u.qpsk.fec_inner; + break; + case FE_QAM: + c->symbol_rate = p->u.qam.symbol_rate; + c->fec_inner = p->u.qam.fec_inner; + c->modulation = p->u.qam.modulation; + break; + case FE_OFDM: + c->bandwidth = p->u.ofdm.bandwidth; + c->code_rate_HP = p->u.ofdm.code_rate_HP; + c->code_rate_LP = p->u.ofdm.code_rate_LP; + c->modulation = p->u.ofdm.constellation; + c->transmission_mode = p->u.ofdm.transmission_mode; + c->guard_interval = p->u.ofdm.guard_interval; + c->hierarchy = p->u.ofdm.hierarchy_information; + break; + case FE_ATSC: + c->modulation = p->u.vsb.modulation; + break; + } +} + int dtv_property_cache_submit(struct dvb_frontend *fe) { @@ -1548,6 +1584,8 @@ static int dvb_frontend_ioctl_legacy(struct inode *inode, struct file *file, case FE_SET_FRONTEND: { struct dvb_frontend_tune_settings fetunesettings; + dtv_property_cache_sync(fe, &fepriv->parameters); + if(fe->dtv_property_cache.state == DTV_TUNE) { if (dvb_frontend_check_parameters(fe, &fepriv->parameters) < 0) { err = -EINVAL; -- cgit v1.2.3