Makefile: new 'make-dist' target

Creates a tar.gz:
* Identical results to the existing distributed tarballs
* Named "dahdi-linux-<version>.tar.gz"
* Only from committed files (uses git-archive)
* Adds a .version file

Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
Acked-by: Russ Meyerriecks <rmeyerriecks@digium.com>
wcxb: Do not access cur_transfer/cur_msg outside of lock.

The spi master cur_transfer and cur_msg should only be changed under the
spin_lock for the master. The result is that if running user space tools, like
fxstest, that check registers on the modules, it's possible to have a message
that was not yet complete flagged as completed which would result in a bad read.

This does not affect "normal" operation of the wcaxx driver since interrupts are
not enabled during module detection, and during normal operation all access to
the resgisters is done in the context of the interrupt handler. This would only
be an issue if the interrupt handler was running and register accesses are tried
in user space context on an SMP system.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
wcaxx: Add extra dummy read when checking for single fxs modules.

This extra read eliminates some problems with detecting certain S100M modules.
It is unclear at this time why it is necessary.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
wcte43x: Update firmware to version e0017.

This resolves issues where, when using internal timing, the first channel of
span 3 has occassional corrupted data in transmit stream.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
dahdi: Replace drv_attr with drv_groups on kernels > 3.12.

drv_attrs was fully removed from the bus structure in upstream commit
e18945b159a1cdbc031f1d3b0b7e515a33bdcbf7 which was merged into 3.13.

This is necessary to compile dahdi against linux version 3.13.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Revert "wcaxx: Use startup/shutdown callbacks to protect access to channel registers."

This reverts commit 1cf7d9b08c892404791b25eff6a743af2a660428.

It turns out this change was not necessary.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
dahdi: Fix previous CentOS 6.5 commit.

The previous commit from earlier today to fix the backport of PDE_DATA was
wrong in that it would not then process the other defines for older kernels if
it detected it was running on a redhat release.

Signed-off-by: Shaun Ruffell <sruffell@digium.com>