On Monday 21 January 2013, Antti Palosaari wrote:
> On 01/20/2013 11:22 PM, Ondrej Zary wrote:
> > Allow disabling I2C gate handling by external configuration.
> > This is required by cards that have all devices on a single I2C bus,
> > like AverMedia A706.
>
> My personal opinion is that I2C gate control should be disabled setting
> callback to NULL (same for the other unwanted callbacks too). There is
> checks for callback existence in DVB-core, it does not call callback if
> it is NULL.
This is TDA8290 internal I2C gate which is used by tda8290 internally and also
by tda827x or tda18271.
> regards
> Antti
>
> > Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
> > ---
> > drivers/media/tuners/tda8290.c | 13 +++++++++++--
> > drivers/media/tuners/tda8290.h | 1 +
> > 2 files changed, 12 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/tuners/tda8290.c
> > b/drivers/media/tuners/tda8290.c index 8c48521..16dfbf2 100644
> > --- a/drivers/media/tuners/tda8290.c
> > +++ b/drivers/media/tuners/tda8290.c
> > @@ -54,6 +54,7 @@ struct tda8290_priv {
> > #define TDA18271 16
> >
> > struct tda827x_config cfg;
> > + bool no_i2c_gate;
> > };
> >
> >
> > /*---------------------------------------------------------------------*/
> > @@ -66,6 +67,9 @@ static int tda8290_i2c_bridge(struct dvb_frontend *fe,
> > int close) unsigned char disable[2] = { 0x21, 0x00 };
> > unsigned char *msg;
> >
> > + if (priv->no_i2c_gate)
> > + return 0;
> > +
> > if (close) {
> > msg = enable;
> > tuner_i2c_xfer_send(&priv->i2c_props, msg, 2);
> > @@ -88,6 +92,9 @@ static int tda8295_i2c_bridge(struct dvb_frontend *fe,
> > int close) unsigned char buf[3] = { 0x45, 0x01, 0x00 };
> > unsigned char *msg;
> >
> > + if (priv->no_i2c_gate)
> > + return 0;
> > +
> > if (close) {
> > msg = enable;
> > tuner_i2c_xfer_send(&priv->i2c_props, msg, 2);
> > @@ -740,8 +747,10 @@ struct dvb_frontend *tda829x_attach(struct
> > dvb_frontend *fe, priv->i2c_props.addr = i2c_addr;
> > priv->i2c_props.adap = i2c_adap;
> > priv->i2c_props.name = "tda829x";
> > - if (cfg)
> > - priv->cfg.config = cfg->lna_cfg;
> > + if (cfg) {
> > + priv->cfg.config = cfg->lna_cfg;
> > + priv->no_i2c_gate = cfg->no_i2c_gate;
> > + }
> >
> > if (tda8290_probe(&priv->i2c_props) == 0) {
> > priv->ver = TDA8290;
> > diff --git a/drivers/media/tuners/tda8290.h
> > b/drivers/media/tuners/tda8290.h index 7e288b2..9959cc8 100644
> > --- a/drivers/media/tuners/tda8290.h
> > +++ b/drivers/media/tuners/tda8290.h
> > @@ -26,6 +26,7 @@ struct tda829x_config {
> > unsigned int probe_tuner:1;
> > #define TDA829X_PROBE_TUNER 0
> > #define TDA829X_DONT_PROBE 1
> > + unsigned int no_i2c_gate:1;
> > };
> >
> > #if defined(CONFIG_MEDIA_TUNER_TDA8290) ||
> > (defined(CONFIG_MEDIA_TUNER_TDA8290_MODULE) && defined(MODULE))
--
Ondrej Zary
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