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authorAndrew de Quincey <adq_dvb@lidskialf.net>2006-07-10 08:34:14 +0200
committerMauro Carvalho Chehab <mchehab@infradead.org>2006-07-29 22:22:07 +0200
commit061b623c54c5722fbb55fddbbdacbf97e8a82701 (patch)
tree98e5ded2a06a78fbad65767c92878fd407f51f53 /drivers/media
parentMerge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/... (diff)
downloadlinux-061b623c54c5722fbb55fddbbdacbf97e8a82701.tar.xz
linux-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.c13
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)