README: initial update for span assignments
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com> git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@10288 a0bf4364-ded3-4de4-8d8a-66a801d63aff
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Tzafrir Cohen
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README
168
README
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@ -538,6 +538,7 @@ timing device it will hang forever in the first cycle. Otherwise it will just
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give you in each cycle the percent of how close it was. Also try running it
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with the option -v for a verbose output.
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Spans and Channels
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~~~~~~~~~~~~~~~~~~
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DAHDI provides telephony *channels* to the userspace applications.
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@ -557,6 +558,77 @@ There are up to 128 spans and 1024 channels. This is a hard-wired limit
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number fits in a 16 bits number). Channel and span numbers start at 1.
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Span Assignments
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~~~~~~~~~~~~~~~~
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A DAHDI device (e.g. a PCI card) is represented within the DAHDI drivers
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as a 'DAHDI device'. Normally (with auto_assign_spans=1 in the module
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dahdi, which is the default), when a device is discovered and loaded,
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it regiters with the DAHDI core and its spans automatically become
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available. However if you have more than one device, you may be
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interested to set explicit spans and channels numbers for them. To use
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manual span assigment, set 'auto_assign_spans' to 0 . e.g. in a file
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under /etc/modprobe.d/ include the following line:
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options dahdi auto_assign_spans=0
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You will then need to assign the spans manually at device startup. You
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will need to assign a span number and channel numbers for each
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available span on the system. On my test system I have one BRI PCI card
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and one Astribank BRI+FXS:
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# grep . /sys/bus/dahdi_devices/devices/*/spantype
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/sys/bus/dahdi_devices/devices/astribanks:xbus-00/spantype:1:BRI
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/sys/bus/dahdi_devices/devices/astribanks:xbus-00/spantype:2:BRI
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/sys/bus/dahdi_devices/devices/astribanks:xbus-00/spantype:3:BRI
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/sys/bus/dahdi_devices/devices/astribanks:xbus-00/spantype:4:BRI
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/sys/bus/dahdi_devices/devices/astribanks:xbus-00/spantype:5:BRI
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/sys/bus/dahdi_devices/devices/astribanks:xbus-00/spantype:6:BRI
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/sys/bus/dahdi_devices/devices/astribanks:xbus-00/spantype:7:BRI
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/sys/bus/dahdi_devices/devices/astribanks:xbus-00/spantype:8:BRI
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/sys/bus/dahdi_devices/devices/astribanks:xbus-00/spantype:9:FXS
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/sys/bus/dahdi_devices/devices/pci:0000:00:09.0/spantype:1:TE
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/sys/bus/dahdi_devices/devices/pci:0000:00:09.0/spantype:2:TE
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/sys/bus/dahdi_devices/devices/pci:0000:00:09.0/spantype:3:NT
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/sys/bus/dahdi_devices/devices/pci:0000:00:09.0/spantype:4:NT
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All spans here, except the FXS one, are BRI spans with 3 channels per span.
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In order to assign a span, we write three numbers separated by colns to
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the file 'assign_span' in the SysFS node
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local_num:span_num:base_chan_num
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Thus:
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echo 1:1:1 >/sys/bus/dahdi_devices/devices/astribanks:xbus-00/assign_span
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echo 3:2:5 >/sys/bus/dahdi_devices/devices/astribanks:xbus-00/assign_span
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echo 9:5:10 >/sys/bus/dahdi_devices/devices/astribanks:xbus-00/assign_span
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echo 4:6:20 >/sys/bus/dahdi_devices/devices/pci:0000:00:09.0/assign_span
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echo 2:8:40 >/sys/bus/dahdi_devices/devices/pci:0000:00:09.0/assign_span
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Which indeed produced:
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# head -n3 -q /proc/dahdi/*
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Span 1: XBUS-00/XPD-00 "Xorcom XPD [usb:LAB-0003].1: BRI_NT"
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1 XPP_BRI_NT/00/00/0
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Span 2: XBUS-00/XPD-02 "Xorcom XPD [usb:LAB-0003].3: BRI_TE"
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5 XPP_BRI_TE/00/02/0
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Span 5: XBUS-00/XPD-10 "Xorcom XPD [usb:LAB-0003].9: FXS" (MASTER)
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10 XPP_FXS/00/10/0
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Span 6: B4/0/4 "B4XXP (PCI) Card 0 Span 4" RED
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23 B4/0/4/1 YELLOW
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Span 8: B4/0/2 "B4XXP (PCI) Card 0 Span 2" RED
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40 B4/0/2/1 RED
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Likewise spans can be unassigned by writing to the 'unassign-span'
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"file".
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Dynamic Spans
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~~~~~~~~~~~~~
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Dynamic spans are spans that are not represented by real hardware.
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@ -644,6 +716,102 @@ see an extra '(In use)':
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2 XPP_FXS/0/0/1 FXOLS (In use)
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SysFS Interface
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~~~~~~~~~~~~~~~
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DAHDI exposes several interfaces under the SysFS virtual file system.
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SysFS represents kernel objects in nodes - directories. There properties
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are often files. They may also contain other nodes or include symlinks
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to other nodes.
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Class DAHDI
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^^^^^^^^^^^
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under /sys/class/dadhi there exists a node for each DAHDI device file
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under /dev/dahdi. The name is 'dahdi!foo' for the file '/dev/dahdi/foo'
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(udev translates exclamation marks to slashes). Those nodes are not, for
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the most part, proper SysFS nodes, and don't include any interesting
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properties.
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Devices Bus
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^^^^^^^^^^^
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Each DAHDI device (a physical device, such as a PCI card) is represented
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by a node under /sys/bus/dahdi_devices/devices named with the name of
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its device.
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Its attributes include:
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===== /sys/bus/dahdi_devices/devices/DEVICE/assgin-span
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Write-only attribute: this device's spans should now be assigned
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("registered"). See section about <<_span_assignments>>.
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===== /sys/bus/dahdi_devices/devices/DEVICE/auto-assign
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Write-only attribute. Spans in the device auto-assign ("register" as in
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the original interface). See section about <<_span_assignments>>.
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===== /sys/bus/dahdi_devices/devices/DEVICE/hardware_id
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A unique hardware-level identifier (e.g. serial number), if available.
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===== /sys/bus/dahdi_devices/devices/DEVICE/manufacturer
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The name of the manufacturer. Freeform-string.
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===== /sys/bus/dahdi_devices/devices/DEVICE/spantype
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A line for each available span: <num>:<type>. This has to be provided
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here as in the case of manual assignment, userspace may need to know
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it before span nodes are created.
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===== /sys/bus/dahdi_devices/devices/DEVICE/spantype
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Device type.
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===== /sys/bus/dahdi_devices/devices/DEVICE/assgin-span
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Write-only attribute: this device's spans should now be unassigned
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("unregistered"). See section about <<_span_assignments>>.
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Spans Bus
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^^^^^^^^^
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Each DAHDI span is represented by a node under
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/sys/bus/dahdi_spans/devices with the name 'span-N' (where N is the
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number of the span). Spans of each device also reside under the node of
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the device.
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Useful attributes in the span node:
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===== /sys/bus/dahdi_spans/devices/span-N/alarms
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The alarms of the span. Currently this is a numeric representation.
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This may change in the future.
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===== /sys/bus/dahdi_spans/devices/span-N/basechan
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The channel number of the first channel. The channel numbers of the
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following channels are guaranteed to follow it.
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===== /sys/bus/dahdi_spans/devices/span-N/channels
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The number of the channels in the span.
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===== /sys/bus/dahdi_spans/devices/span-N/desc
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A free-form description of the span.
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===== /sys/bus/dahdi_spans/devices/span-N/is_digital
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1 if the span is digital, 0 if it isn't.
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===== /sys/bus/dahdi_spans/devices/span-N/is_sync_master
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1 if the span is the sync master, 0 if it isn't.
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===== /sys/bus/dahdi_spans/devices/span-N/lbo
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LBO setting for the channel.
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===== /sys/bus/dahdi_spans/devices/span-N/local_spanno
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The number of the span within the DAHDI device.
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===== /sys/bus/dahdi_spans/devices/span-N/name
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A concise name for this span.
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===== /sys/bus/dahdi_spans/devices/span-N/spantype
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A very short type string.
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===== /sys/bus/dahdi_spans/devices/span-N/syncsrc
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???
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User-space Interface
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~~~~~~~~~~~~~~~~~~~~
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User-space programs can only work with DAHDI channels. The basic
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