smp_write_gpio man page on OpenSuSE
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SMP_WRITE_GPIO(8) SMP_UTILS SMP_WRITE_GPIO(8)
NAME
smp_write_gpio - invoke WRITE GPIO REGISTER (ENHANCED) SMP function
SYNOPSIS
smp_write_gpio [--count=CO] [--data=H,H...] [--help] [--hex]
[--index=IN] [--interface=PARAMS] [--raw] [--sa=SAS_ADDR] [--type=TY]
[--verbose] [--version] SMP_DEVICE[,N]
DESCRIPTION
Sends a SAS Serial Management Protocol (SMP) WRITE GPIO REGISTER or a
WRITE GPIO REGISTER ENHANCED function request to an SMP target. The SMP
target is identified by the SMP_DEVICE and the SAS_ADDR. Depending on
the interface, the SAS_ADDR may be deduced from the SMP_DEVICE. The mpt
interface uses SMP_DEVICE to identify a HBA (an SMP initiator) and
needs the additional ,N to differentiate between HBAs if there are mul‐
tiple present.
This function is defined in SFF-8485 ( see www.sffcommittee.com )
together with its corresponding READ GPIO REGISTER (ENHANCED) SMP func‐
tion. The other SMP functions are defined in SAS documents at
www.t10.org . SFF-8485 defines a curious device called a "virtual SMP
port" that lives in a host bus adapter (HBA) and allows SMP to manipu‐
late the sideband signals in wide internal cables. To stop other ini‐
tiators in a multi-initiator domain from accessing those sideband sig‐
nals, the virtual SMP (target) port is not indicated in a DISCOVER
response.
For notes on the SMP WRITE GPIO REGISTER ENHANCED function see the sec‐
tion on the ENHANCED FUNCTION below.
OPTIONS
Mandatory arguments to long options are mandatory for short options as
well.
-c, --count=CO
where CO is the register count. This is the number of (4 byte)
registers to send. The default value is 1.
-d, --data=H,H...
this option supplies a comma separated list of hexadecimal bytes
(0 to ff inclusive) that will be used as write data in the WRITE
GPIO REGISTER request. The number of bytes supplied should be
four times --count=C The first 4 bytes will become the first
register written.
-d, --data=-
reads string of hexadecimal bytes from stdin. Spaces, tabs and
line feeds additionally are permitted as separators.
-E, --enhanced
sends a WRITE GPIO REGISTER ENHANCED function request (default:
send a WRITE GPIO REGISTER function request).
-h, --help
output the usage message then exit.
-H, --hex
output the response (less the CRC field) in hexadecimal.
-i, --index=IN
where IN is the register index. This value is origin zero and
its default value is 0. The request will send --count=CO regis‐
ters starting from --index=IN of the given --type=TY.
-I, --interface=PARAMS
interface specific parameters. In this case "interface" refers
to the path through the operating system to the SMP initiator.
See the smp_utils man page for more information.
-r, --raw
send the response (less the CRC field) to stdout in binary. All
error messages are sent to stderr.
-s, --sa=SAS_ADDR
specifies the SAS address of the SMP target device. Typically
this is an expander. This option may not be needed if the
SMP_DEVICE has the target's SAS address within it. The SAS_ADDR
is in decimal but most SAS addresses are shown in hexadecimal.
To give a number in hexadecimal either prefix it with '0x' or
put a trailing 'h' on it.
-t, --type=TY
where TY is the register type. The default value is 0
(GPIO_CFG). The request will send --count=CO registers starting
from --index=IN of the given --type=TY.
-v, --verbose
increase the verbosity of the output. Can be used multiple
times.
-V, --version
print the version string and then exit.
ENHANCED FUNCTION
In the technical review of SAS-2 prior to standardization in this t10
document: 08-212r8.pdf (page 871 or 552) there is a comment that the
READ GPIO REGISTER and WRITE GPIO REGISTER function headers (i.e. first
4 bytes) do not comply with all the other SMP functions in SAS-2.
There is a suggestion that enhanced variants be introduced in the next
version of the SFF-8485 document. If that ever happened then it has not
been made public. In SAS-2.1 both the READ and WRITE GPIO REGISTER
functions have been made obsolete and the corresponding ENHANCED func‐
tion numbers are "restricted" for SFF-8485.
If the --enhanced option is given then the ENHANCED function number is
sent; the register type, index and count fields (1 byte each) are
increased by two byte positions leaving enough space for a compliant
SAS-2 SMP header to be built.
CONFORMING TO
The SMP WRITE GPIO REGISTER function is defined in SFF-8485 (see
www.sffcommittee.com ) together with its corresponding READ GPIO REGIS‐
TER SMP function.
AUTHORS
Written by Douglas Gilbert.
REPORTING BUGS
Report bugs to <dgilbert at interlog dot com>.
COPYRIGHT
Copyright © 2006-2011 Douglas Gilbert
This software is distributed under a FreeBSD license. There is NO war‐
ranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
POSE.
SEE ALSO
smp_utils, smp_read_gpio(smp_utils)
smp_utils-0.97 August 2011 SMP_WRITE_GPIO(8)
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