[PATCH v2 2/7] iio:accel:stk8312: check for invalid value

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Revision 1.2 of the datasheet recommends on page 22 to only write non-zero
values read from OTP register 0x70 into AFECTRL register.

Signed-off-by: Hartmut Knaack <knaack.h@xxxxxx>
Reviewed-by: Tiberiu Breana <tiberiu.a.breana@xxxxxxxxx>
---
 drivers/iio/accel/stk8312.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/iio/accel/stk8312.c b/drivers/iio/accel/stk8312.c
index c2bd1444d6da..6592be8e6377 100644
--- a/drivers/iio/accel/stk8312.c
+++ b/drivers/iio/accel/stk8312.c
@@ -150,6 +150,8 @@ static int stk8312_otp_init(struct stk8312_data *data)
 		goto exit_err;
 
 	ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
+	if (ret == 0)
+		ret = -EINVAL;
 	if (ret < 0)
 		goto exit_err;
 
-- 
2.4.6

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