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Commit 0a9c1475 authored by Jean Delvare's avatar Jean Delvare
Browse files

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: default avatarJean Delvare <khali@linux-fr.org>
Cc: Alex Deucher <alexdeucher@gmail.com>
parent d07b56b3

drivers/i2c/algos/i2c-algo-bit.c

+9 −0
Original line number Diff line number Diff line
@@ -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;

}

include/linux/i2c-algo-bit.h

+2 −0
Original line number Diff line number Diff line
@@ -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,