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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] [--in- dex=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 ) to- gether 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 re- sponse. 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 in- creased 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 (C) 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)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENHANCED FUNCTION | CONFORMING TO | AUTHORS | REPORTING BUGS | COPYRIGHT | SEE ALSO
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