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| author | Jean Delvare <khali@linux-fr.org> | 2010-03-13 20:56:56 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2010-03-13 20:56:56 +0100 |
| commit | 0a9c14751377a1407f5e35791e13651d2fc7801c (patch) | |
| tree | e4e524eafda521834d3d2a7fa8a6118e1bae3c32 | |
| parent | d07b56b3098b9f32ae6dedeacbc594bd01dcfcd1 (diff) | |
| download | lwn-0a9c14751377a1407f5e35791e13651d2fc7801c.tar.gz lwn-0a9c14751377a1407f5e35791e13651d2fc7801c.zip | |
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 <khali@linux-fr.org>
Cc: Alex Deucher <alexdeucher@gmail.com>
| -rw-r--r-- | drivers/i2c/algos/i2c-algo-bit.c | 9 | ||||
| -rw-r--r-- | 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 e25e13980af3..e8d568c3fb09 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); + 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); return ret; } diff --git a/include/linux/i2c-algo-bit.h b/include/linux/i2c-algo-bit.h index 111334f5b922..4f98148c11c3 100644 --- a/include/linux/i2c-algo-bit.h +++ b/include/linux/i2c-algo-bit.h @@ -36,6 +36,8 @@ struct i2c_algo_bit_data { void (*setscl) (void *data, int state); int (*getsda) (void *data); int (*getscl) (void *data); + int (*pre_xfer) (struct i2c_adapter *); + void (*post_xfer) (struct i2c_adapter *); /* local settings */ int udelay; /* half clock cycle time in us, |