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V4L/DVB (6905): tda18271: check ID register during attach

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Identify the silicon during attach, return NULL if unsupported device.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Michael Krufky 2007-12-24 04:15:20 -03:00 committed by Mauro Carvalho Chehab
parent 7e946c8a42
commit 49e7aaf0ff
1 changed files with 38 additions and 2 deletions
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40
drivers/media/dvb/frontends/tda18271-fe.c
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@ -719,6 +719,36 @@ static int tda18271_get_bandwidth(struct dvb_frontend *fe, u32 *bandwidth)
return 0;
}
static int tda18271_get_id(struct dvb_frontend *fe)
{
struct tda18271_priv *priv = fe->tuner_priv;
unsigned char *regs = priv->tda18271_regs;
char *name;
int ret = 0;
tda18271_read_regs(fe);
switch (regs[R_ID] & 0x7f) {
case 3:
name = "TDA18271HD/C1";
break;
case 4:
name = "TDA18271HD/C2";
ret = -EPROTONOSUPPORT;
break;
default:
name = "Unknown device";
ret = -EINVAL;
break;
}
dbg_info("%s detected @ %d-%04x%s\n", name,
i2c_adapter_id(priv->i2c_adap), priv->i2c_addr,
(0 == ret) ? "" : ", device not supported.");
return ret;
}
static struct dvb_tuner_ops tda18271_tuner_ops = {
.info = {
.name = "NXP TDA18271HD",
@ -749,14 +779,20 @@ struct dvb_frontend *tda18271_attach(struct dvb_frontend *fe, u8 addr,
priv->i2c_adap = i2c;
priv->gate = gate;
fe->tuner_priv = priv;
if (tda18271_get_id(fe) < 0)
goto fail;
memcpy(&fe->ops.tuner_ops, &tda18271_tuner_ops,
sizeof(struct dvb_tuner_ops));
fe->tuner_priv = priv;
tda18271_init_regs(fe);
return fe;
fail:
tda18271_release(fe);
return NULL;
}
EXPORT_SYMBOL_GPL(tda18271_attach);
MODULE_DESCRIPTION("NXP TDA18271HD analog / digital tuner driver");