iio:st_sensors: emulate SMBus block read if needed

BugLink: https://bugs.launchpad.net/bugs/1676356
Use SMBus "block read" protocol only when supported by adapter.

Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
(cherry picked from commit 169a88c1ee19b0734c9703d51a6d8ebe538f5bc3)
Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/drivers/iio/common/st_sensors/st_sensors_i2c.c b/drivers/iio/common/st_sensors/st_sensors_i2c.c
index 63e573c398fb72bf5c96a17451525ef9a9ecc60c..c83df4dbfcd73567440e8d186938644b6bf02c91 100644 (file)
--- a/drivers/iio/common/st_sensors/st_sensors_i2c.c
+++ b/drivers/iio/common/st_sensors/st_sensors_i2c.c
@@ -49,8 +49,8 @@ static int st_sensors_i2c_read_multiple_byte(
        if (multiread_bit)
                reg_addr |= ST_SENSORS_I2C_MULTIREAD;
 
-       return i2c_smbus_read_i2c_block_data(to_i2c_client(dev),
-                                                       reg_addr, len, data);
+       return i2c_smbus_read_i2c_block_data_or_emulated(to_i2c_client(dev),
+                                                        reg_addr, len, data);
 }
 
 static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb,