I'm trying to use I2C with beaglebone but I cannot write more than 1 byte

Question

I\'m trying to control DAC5571 with Beaglebone Black. My kernel version is; Linux beaglebone 4.14.108-ti-r137 #1stretch SMP PREEMPT Tue Aug 25 01:48:39 UTC 2020 armv7l GNU/L