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i2c: algo-bit: add support for I2C_M_STOP

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Support for enforced STOPs will allow us to use SCCB compatible devices.

Based on a preliminary patch by Wolfram Sang.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Jean Delvare 2017-06-21 09:24:02 +02:00 committed by Wolfram Sang
parent 413dfbbfca
commit 606fd2788b
1 changed files with 10 additions and 3 deletions
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11
drivers/i2c/algos/i2c-algo-bit.c
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@ -553,10 +553,17 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
nak_ok = pmsg->flags & I2C_M_IGNORE_NAK;
if (!(pmsg->flags & I2C_M_NOSTART)) {
if (i) {
bit_dbg(3, &i2c_adap->dev, "emitting "
"repeated start condition\n");
if (msgs[i - 1].flags & I2C_M_STOP) {
bit_dbg(3, &i2c_adap->dev,
"emitting enforced stop/start condition\n");
i2c_stop(adap);
i2c_start(adap);
} else {
bit_dbg(3, &i2c_adap->dev,
"emitting repeated start condition\n");
i2c_repstart(adap);
}
}
ret = bit_doAddress(i2c_adap, pmsg);
if ((ret != 0) && !nak_ok) {
bit_dbg(1, &i2c_adap->dev, "NAK from "