I attempted to catalog the large number of variants of this driver floating 
around the web:
https://github.com/dbason/crystalhd/blob/master/HISTORY.md

Here are the ones I've found, roughly in order of most obsolete/broken
to newest:

1. Staging driver from Linux kernel v3.16 version
(https://git.kernel.org/cgit/linux/kernel/git/gregkh/staging.git/tree/drivers/staging/crystalhd?h=v3.16)
— this version was removed in 2014 from v3.1
(http://lkml.iu.edu/hypermail/linux/kernel/1408.0/01475.html) due to the
fact that it was unmaintained and obsolete; it only supported the
BCM70012 chip, for example.

  * See this LKML kernel thread from 2013 where Steven Newbury and Greg
K-H discuss this code: https://lkml.org/lkml/2013/10/27/103

2. The Debian version,
   which appears to be based on a ~2010 version of the code from the
   mainline kernel, and like it only supports the BCM70012 chip.

3. Jarod Wilson's tree, last updated in 2012:
http://git.linuxtv.org/cgit.cgi/jarod/crystalhd.git/

4. Yeradis's tree, forked from Jarod's tree, and last updated in 2013:
https://github.com/yeradis/crystalhd

5. Dbason's tree, forked from Yeradis's tree, and last updated in 2016:
https://github.com/dbason/crystalhd


Only the last version can be built and used without error on a modern kernel.

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https://bugs.launchpad.net/bugs/1579216

Title:
  why was crystalhd-dkms package removed?

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