SMP_WRITE_GPIO(8)						     SMP_UTILS							 SMP_WRITE_GPIO(8)

NAME

       smp_write_gpio - invoke WRITE GPIO REGISTER SMP function

SYNOPSIS

       smp_write_gpio  [--count=CO] [--data=H,H...] [--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) WRITE GPIO REGISTER request function 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 READ 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 in 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.

       -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.

       -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. The request will send --count=CO registers
	      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 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.

CONFORMING TO

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

smp_utils-0.93							   January 2008 						 SMP_WRITE_GPIO(8)