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] [--verbose] [--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 interface 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 reg-
	      isters 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 registers 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 PUR-
       POSE.

SEE ALSO

       smp_utils, smp_write_gpio(smp_utils)

smp_utils-0.93							   January 2008 						  SMP_READ_GPIO(8)