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Commit 061b623c authored by Andrew de Quincey's avatar Andrew de Quincey Committed by Mauro Carvalho Chehab
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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: default avatarAndrew de Quincey <adq_dvb@lidskialf.net>
Acked-by: default avatarMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent dc710afe

drivers/media/dvb/frontends/dvb-pll.c

+13 −0
Original line number Diff line number Diff line
@@ -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)