From 85f77f2761b11d3a5c91ccf5273d29687b84503c Mon Sep 17 00:00:00 2001 From: Jean Delvare Date: Wed, 10 Mar 2010 14:18:44 -0500 Subject: [PATCH] i2c-algo-bit: Add pre- and post-xfer hooks Drivers might have to do random things before and/or after I2C transfers. Add hooks to the i2c-algo-bit implementation to let them do so. Signed-off-by: Jean Delvare --- drivers/i2c/algos/i2c-algo-bit.c | 9 +++++++++ include/linux/i2c-algo-bit.h | 2 ++ 2 files changed, 11 insertions(+), 0 deletions(-) diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c index e25e139..c9a37e7 100644 --- a/drivers/i2c/algos/i2c-algo-bit.c +++ b/drivers/i2c/algos/i2c-algo-bit.c @@ -522,6 +522,12 @@ static int bit_xfer(struct i2c_adapter *i2c_adap, int i, ret; unsigned short nak_ok; + if (adap->pre_xfer) { + ret = adap->pre_xfer(i2c_adap, adap->data); + if (ret < 0) + return ret; + } + bit_dbg(3, &i2c_adap->dev, "emitting start condition\n"); i2c_start(adap); for (i = 0; i < num; i++) { @@ -570,6 +576,9 @@ static int bit_xfer(struct i2c_adapter *i2c_adap, bailout: bit_dbg(3, &i2c_adap->dev, "emitting stop condition\n"); i2c_stop(adap); + + if (adap->post_xfer) + adap->post_xfer(i2c_adap, adap->data); return ret; } diff --git a/include/linux/i2c-algo-bit.h b/include/linux/i2c-algo-bit.h index 111334f..b937372 100644 --- a/include/linux/i2c-algo-bit.h +++ b/include/linux/i2c-algo-bit.h @@ -32,6 +32,8 @@ */ struct i2c_algo_bit_data { void *data; /* private data for lowlevel routines */ + int (*pre_xfer) (struct i2c_adapter *i2c_adap, void *data); + void (*post_xfer) (struct i2c_adapter *i2c_adap, void *data); void (*setsda) (void *data, int state); void (*setscl) (void *data, int state); int (*getsda) (void *data); -- 1.5.6.3