/home/user # i2cdetect -y 0
Warning: Can't use SMBus Quick Write command, will skip some addresses
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:
10:
20:
30: -- -- -- -- -- -- -- --
40:
50: -- -- -- -- -- -- -- -- 58 -- -- -- -- -- -- --
60:
70:
/home/user # echo 1278 > /sys/class/gpio/export
/home/user # cat /sys/class/gpio/gpio1278/direction
in
/home/user # echo out >  /sys/class/gpio/gpio1278/direction
/home/user # i2cdetect -y 0
Warning: Can't use SMBus Quick Write command, will skip some addresses
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:
10:
20:
30: -- -- -- -- -- -- -- --
40:
50: -- -- -- -- -- -- -- -- 58 -- -- -- -- -- -- --
60:
70:
/home/user # echo 0 > /sys/class/gpio/gpio1278/value
/home/user # echo 1 > /sys/class/gpio/gpio1278/value
/home/user # cat /sys/class/gpio/gpio1278/value
1
/home/user # i2cdetect -y 0
Warning: Can't use SMBus Quick Write command, will skip some addresses
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:
10:
20:
30: -- -- -- -- -- -- -- --
40:
50: -- -- -- -- -- -- -- -- 58 -- -- 5b -- -- -- --
60:
70:
/home/user # i2cget -y 0 0x5b 0x10
0x23