i2c: algo: bit: add flag to whitelist atomic transfers
Use the new xfer_atomic callback to check a newly introduced flag to
whitelist atomic transfers. This will report configurations which
worked accidently.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/algos/i2c-algo-bit.c b/drivers/i2c/algos/i2c-algo-bit.c
index 5e5990a..913db01 100644
--- a/drivers/i2c/algos/i2c-algo-bit.c
+++ b/drivers/i2c/algos/i2c-algo-bit.c
@@ -603,6 +603,23 @@ static int bit_xfer(struct i2c_adapter *i2c_adap,
return ret;
}
+/*
+ * We print a warning when we are not flagged to support atomic transfers but
+ * will try anyhow. That's what the I2C core would do as well. Sadly, we can't
+ * modify the algorithm struct at probe time because this struct is exported
+ * 'const'.
+ */
+static int bit_xfer_atomic(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[],
+ int num)
+{
+ struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+
+ if (!adap->can_do_atomic)
+ dev_warn(&i2c_adap->dev, "not flagged for atomic transfers\n");
+
+ return bit_xfer(i2c_adap, msgs, num);
+}
+
static u32 bit_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_NOSTART | I2C_FUNC_SMBUS_EMUL |
@@ -615,8 +632,9 @@ static u32 bit_func(struct i2c_adapter *adap)
/* -----exported algorithm data: ------------------------------------- */
const struct i2c_algorithm i2c_bit_algo = {
- .master_xfer = bit_xfer,
- .functionality = bit_func,
+ .master_xfer = bit_xfer,
+ .master_xfer_atomic = bit_xfer_atomic,
+ .functionality = bit_func,
};
EXPORT_SYMBOL(i2c_bit_algo);
