SMP_READ_GPIO(8)                                            SMP_UTILS                                           SMP_READ_GPIO(8)



NAME
       smp_read_gpio - invoke READ GPIO REGISTER SMP function

SYNOPSIS
       smp_read_gpio [--count=CO] [--help] [--hex] [--index=IN] [--interface=PARAMS] [--raw] [--sa=SAS_ADDR] [--type=TY] [--ver-
       bose] [--version] SMP_DEVICE[,N]

DESCRIPTION
       Sends a SAS Management Protocol (SMP) READ GPIO REGISTER request to a 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. With one inter-
       face there is one SMP_DEVICE per machine so the SMP_DEVICE,N syntax is needed to differentiate between HBAs if there  are
       multiple present.

       This function is defined in SFF-8485 ( see www.sffcommittee.com ) together with its corresponding WRITE GPIO REGISTER SMP
       function.  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 manipulate the sideband signals on
       wide internal cables. To stop other initiators in a multi-initiator domain from accessing  those  sideband  signals,  the
       virtual SMP (target) port is not indicated in a DISCOVER response.

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 request. The default value is 1.

       -h, --help
              output the usage message then exit.

       -H, --hex
              output the response in hexadecimal.

       -i, --index=IN
              where  IN  is  the  register index. This value is origin zero and its default value is 0. If the request succeeds,
              then --count=CO registers starting from --index=IN of the given --type=TY should be in the response.

       -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 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).  If the request succeeds, then --count=CO regis-
              ters starting from --index=IN of the given --type=TY should be in the response.

       -v, --verbose
              increase the verbosity of the output. Can be used multiple times

       -V, --version
              print the version string and then exit.

CONFORMING TO
       The SMP READ GPIO REGISTER function is defined in SFF-8485 (see www.sffcommittee.com ) together  with  its  corresponding
       WRITE GPIO REGISTER SMP function.

AUTHORS
       Written by Douglas Gilbert.

REPORTING BUGS
       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT
       Copyright (C) 2006-2008 Douglas Gilbert
       This software is distributed under a FreeBSD license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
       PARTICULAR PURPOSE.

SEE ALSO
       smp_utils, smp_write_gpio(smp_utils)



smp_utils-0.93                                            January 2008                                          SMP_READ_GPIO(8)