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authorJean Delvare <khali@linux-fr.org>2010-03-13 20:56:56 +0100
committerJean Delvare <khali@linux-fr.org>2010-03-13 20:56:56 +0100
commit0a9c14751377a1407f5e35791e13651d2fc7801c (patch)
treee4e524eafda521834d3d2a7fa8a6118e1bae3c32 /drivers/i2c
parentd07b56b3098b9f32ae6dedeacbc594bd01dcfcd1 (diff)
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/algos/i2c-algo-bit.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c
index e25e13980af..e8d568c3fb0 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;
}