Merge changes I61375a73,Iffe85dd8 into mnc-dr-dev
Dylan Reid authored
* changes:
  Add pcm_get_poll_fd
  Export pcm_mmap_avail
ad5e1116
tinyalsa: a small library to interface with ALSA in the Linux kernel

The aims are:

- Provide a basic pcm and mixer API
- If it's not absolutely needed, don't add it to the API
- Avoid supporting complex and unnecessary operations that could be
  dealt with at a higher level