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sysfs: new driver attribute: master_span

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* This changeset adds master_span as an attribute of the span's driver:
  /sys/bus/dahdi_spans/drivers/generic_lowlevel/master_span
* This is mainly used for debugging.
* Reading from it the master span number (or 0 if there is no master
  span).
* Writing a number to it, force specified span to be master
* Existing Alternatives:
  - grep "MASTER" from /proc/dahdi/*
  - cat /sys/bus/dahdi_spans/devices/span-*/is_sync_master

(Note: commit d8fe2af23d is also Acked-By
Tzafrir Cohen <tzafrir.cohen@xorcom.com>)

Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>
Acked-by: Russ Meyerriecks <rmeyerriecks@digium.com>
This commit is contained in:
Oron Peled
2013-10-14 13:36:01 +02:00
committed by Tzafrir Cohen
parent d8fe2af23d
commit dd944f3362
4 changed files with 56 additions and 0 deletions
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6
README
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@@ -989,6 +989,12 @@ A very short type string.
===== /sys/bus/dahdi_spans/devices/span-N/syncsrc
Current sync source.
==== sys/bus/dahdi_spans/drivers/generic_lowlevel/master_span
All spans in the bus are handled by a single driver. The driver has one
non-standard attribute: master_span. printing it shows the current DAHDI
master span writing a number to it forces setting this span as the master
span.
Channels Bus
^^^^^^^^^^^^