iio: imu: inv_icm42600: change invalid data error to -EBUSY

Temperature sensor returns the temperature of the mechanical parts
of the chip. If both accel and gyro are off, the temperature sensor is
also automatically turned off and returns invalid data.

In this case, returning -EBUSY error code is better then -EINVAL and
indicates userspace that it needs to retry reading temperature in
another context.

Fixes: bc3eb02 ("iio: imu: inv_icm42600: add temperature sensor support")
Signed-off-by: Jean-Baptiste Maneyrol <[email protected]>
Cc: [email protected]
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Sean Nyekjaer <[email protected]>
Link: https://patch.msgid.link/20250808-inv-icm42600-change-temperature-error-code-v1-1-986fbf63b77d@tdk.com
Signed-off-by: Jonathan Cameron <[email protected]>

Author: jmaneyrol-invn

drivers/iio/imu/inv_icm42600/inv_icm42600_temp.c

@@ -32,8 +32,12 @@ static int inv_icm42600_temp_read(struct inv_icm42600_state *st, s16 *temp)
 		goto exit;
 
 	*temp = (s16)be16_to_cpup(raw);
+	/*
+	 * Temperature data is invalid if both accel and gyro are off.
+	 * Return -EBUSY in this case.
+	 */
 	if (*temp == INV_ICM42600_DATA_INVALID)
-		ret = -EINVAL;
+		ret = -EBUSY;
 
 exit:
 	mutex_unlock(&st->lock);