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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 <khali@linux-fr.org>
Cc: Alex Deucher <alexdeucher@gmail.com>
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Jean Delvare committed Mar 13, 2010
1 parent d07b56b commit 0a9c147
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Showing 2 changed files with 11 additions and 0 deletions.
9 changes: 9 additions & 0 deletions drivers/i2c/algos/i2c-algo-bit.c
Original file line number Diff line number Diff line change
Expand Up @@ -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++) {
Expand Down Expand Up @@ -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;
}

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2 changes: 2 additions & 0 deletions include/linux/i2c-algo-bit.h
Original file line number Diff line number Diff line change
Expand Up @@ -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,
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