diff options
| author |   Andrew de Quincey <adq_dvb@lidskialf.net> | 2006-07-10 03:34:14 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@infradead.org> | 2006-07-29 17:22:07 -0300 |
| commit | 061b623c54c5722fbb55fddbbdacbf97e8a82701 (patch) | |
| tree | 98e5ded2a06a78fbad65767c92878fd407f51f53 /drivers/media | |
| parent | Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev (diff) | |
| download | linux-dev-061b623c54c5722fbb55fddbbdacbf97e8a82701.tar.xz linux-dev-061b623c54c5722fbb55fddbbdacbf97e8a82701.zip | |
V4L/DVB (4291): Add dvbpll i2c device check.
Some cards have multiple possible addresses for their PLLs, with no other
way to tell if a PLL is present or not apart from probing to see if an i2c
device is present. This adds a quick check to see if an i2c device is
present at the given i2c address.
Signed-off-by: Andrew de Quincey <adq_dvb@lidskialf.net>
Acked-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/dvb/frontends/dvb-pll.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/media/dvb/frontends/dvb-pll.c b/drivers/media/dvb/frontends/dvb-pll.c index a189683454b7..b9a338875948 100644 --- a/drivers/media/dvb/frontends/dvb-pll.c +++ b/drivers/media/dvb/frontends/dvb-pll.c @@ -613,7 +613,20 @@ static struct dvb_tuner_ops dvb_pll_tuner_ops = { int dvb_pll_attach(struct dvb_frontend *fe, int pll_addr, struct i2c_adapter *i2c, struct dvb_pll_desc *desc) { + u8 b1 [] = { 0 }; + struct i2c_msg msg [] = { { .addr = pll_addr, .flags = 0, .buf = NULL, .len = 0 }, + { .addr = pll_addr, .flags = I2C_M_RD, .buf = b1, .len = 1 } }; struct dvb_pll_priv *priv = NULL; + int ret; + + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 1); + + ret = i2c_transfer (i2c, msg, 2); + if (ret != 2) + return -1; + if (fe->ops.i2c_gate_ctrl) + fe->ops.i2c_gate_ctrl(fe, 0); priv = kzalloc(sizeof(struct dvb_pll_priv), GFP_KERNEL); if (priv == NULL) |