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i2c-algo-bit: Add pre- and post-xfer hooks

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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 <[email protected]>
Cc: Alex Deucher <[email protected]>
This commit is contained in:
Jean Delvare 2010-03-13 20:56:56 +01:00
commit 0a9c147513
2 changed files with 11 additions and 0 deletions
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9
drivers/i2c/algos/i2c-algo-bit.c
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@ -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;
}