• Fixed rate operation for es1370 chip to solve conflicting sampling rate between playback and recording. This can be disabled / enabled via kernel hints (hint.pcm.<unit>.fixed_rate=0/4000-48000) or sysctl hw.snd.pcm<unit>.fixed_rate=0/4000-48000). Default to 48khz fixed rate. [1]
• Basic cleanup. *_es1371x_* -> *_es137x_*.
• Some locking fixes. [2]

Submitted by: Ariff Abdullah <skywizard@MyBSD.org.my>
Discussed with: yongari [2]
See also: http://lists.freebsd.org/pipermail/freebsd-multimedia/2005-September/002758.html [1]
Reported by: Jos Backus <jos at catnook.com> [1]