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[media] fc0012: rework attach() to check chip id and I/O errors

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Signed-off-by: Antti Palosaari <crope@iki.fi>
Acked-by: Hans-Frieder Vogt <hfvogt@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari 2012-12-09 13:28:45 -03:00 committed by Mauro Carvalho Chehab
parent 3a98477200
commit 44ff69cd95
1 changed files with 49 additions and 10 deletions
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59
drivers/media/tuners/fc0012.c
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@ -443,32 +443,71 @@ static const struct dvb_tuner_ops fc0012_tuner_ops = {
struct dvb_frontend *fc0012_attach(struct dvb_frontend *fe,
struct i2c_adapter *i2c, const struct fc0012_config *cfg)
{
struct fc0012_priv *priv = NULL;
struct fc0012_priv *priv;
int ret;
u8 chip_id;
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
priv = kzalloc(sizeof(struct fc0012_priv), GFP_KERNEL);
if (priv == NULL)
return NULL;
if (!priv) {
ret = -ENOMEM;
dev_err(&i2c->dev, "%s: kzalloc() failed\n", KBUILD_MODNAME);
goto err;
}
priv->i2c = i2c;
priv->cfg = cfg;
priv->i2c = i2c;
info("Fitipower FC0012 successfully attached.");
/* check if the tuner is there */
ret = fc0012_readreg(priv, 0x00, &chip_id);
if (ret < 0)
goto err;
fe->tuner_priv = priv;
dev_dbg(&i2c->dev, "%s: chip_id=%02x\n", __func__, chip_id);
if (priv->cfg->loop_through)
fc0012_writereg(priv, 0x09, 0x6f);
switch (chip_id) {
case 0xa1:
break;
default:
ret = -ENODEV;
goto err;
}
dev_info(&i2c->dev, "%s: Fitipower FC0012 successfully identified\n",
KBUILD_MODNAME);
if (priv->cfg->loop_through) {
ret = fc0012_writereg(priv, 0x09, 0x6f);
if (ret < 0)
goto err;
}
/*
* TODO: Clock out en or div?
* For dual tuner configuration clearing bit [0] is required.
*/
if (priv->cfg->clock_out)
fc0012_writereg(priv, 0x0b, 0x82);
if (priv->cfg->clock_out) {
ret = fc0012_writereg(priv, 0x0b, 0x82);
if (ret < 0)
goto err;
}
fe->tuner_priv = priv;
memcpy(&fe->ops.tuner_ops, &fc0012_tuner_ops,
sizeof(struct dvb_tuner_ops));
err:
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
if (ret) {
dev_dbg(&i2c->dev, "%s: failed: %d\n", __func__, ret);
kfree(priv);
return NULL;
}
return fe;
}
EXPORT_SYMBOL(fc0012_attach);