This is need for sequential read/write.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <[email protected]>
---
drivers/i2c/algos/i2c-algo-bit.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c
index 37af27c..dc43eb8 100644
--- a/drivers/i2c/algos/i2c-algo-bit.c
+++ b/drivers/i2c/algos/i2c-algo-bit.c
@@ -390,6 +390,22 @@ static int sendbytes(struct i2c_adapter *i2c_adap, struct
i2c_msg *msg)
return wrcount;
}
+static int acknak(struct i2c_adapter *i2c_adap, int is_ack)
+{
+ struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+
+ /* assert: sda is high */
+ if (is_ack) /* send ack */
+ setsda(adap, 0);
+ udelay((adap->udelay + 1) / 2);
+ if (sclhi(adap) < 0) { /* timeout */
+ dev_err(&i2c_adap->dev, "readbytes: ack/nak timeout\n");
+ return -ETIMEDOUT;
+ }
+ scllo(adap);
+ return 0;
+}
+
static int readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msg)
{
int inval;
@@ -414,6 +430,10 @@ static int readbytes(struct i2c_adapter *i2c_adap, struct
i2c_msg *msg)
(flags & I2C_M_NO_RD_ACK)
? "(no ack/nak)"
: (count ? "A" : "NA"));
+
+ inval = acknak(i2c_adap, count);
+ if (inval < 0)
+ return inval;
}
return rdcount;
}
--
1.7.10.4
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