Improvised pattern.
Ch 4
Starting in 2nd loop, hdc in next 2 loops, then 3 hdc in last loop (5 hdc)
On opposite side of foundation chain, hdc in each of next 2 loops, then 3 hdc in last loop (5 hdc)
Continue working one hdc in each hdc, spiral-wise, until desired height is achieved (for an iPod shuffle, about 3 rounds)
For cover and button-hole, Ch2 then hdc in first loop, then 2 tc, then 2 hdc. Tie off and weave in ends.
Button is sewn on with regular sewing thread.