firewire-request(8)

NAME
firewire-request - query and configure FireWire devices

SYNOPSIS
firewire-request [options] device command [parameters]

DESCRIPTION
firewire-request is a utility to query and configure FireWire devices.

The device parameter specifies the device file (/dev/fw*) of the device that is to be accessed.

All numbers must be specified in hexadecimal notation. When specifying data blocks, you can separate bytes or quadlets with spaces, but then you have to remember to quote them in the shell so that all bytes are recognized as a single parameter.

In the following commands, address is either a 48-bit address or a register name.

The following commands are available:

firewire-request device read address [length]
    Send a read request to the device, and print the value returned by the device, if successful.

    If length is not specified, it is derived from address: for a named register, the register's length is used; for a numerical address, a default length of one quadlet (4 bytes) is used.

firewire-request device write|broadcast address data
    Send a write request to the device.

    Broadcasts are allowed only for a device that corresponds to a local controller, and are sent to all the other devices on the bus.

firewire-request device locktype address data [data2]
    Execute a lock transaction (an atomic change) on the device.

    locktype can be any of the following:

    mask_swap
        Change the bits set in data to the value in data2.

    compare_swap
        If the register has the same value as data, set it to data2.

    add[_big]
        Increase the register by data.

    add_little
        Increase the little-endian register by data.

    bounded_add[_big]
        If the register has not the the same value as data, increase it by data2.

    wrap_add[_big]
        If the register has not the the same value as data, increase it by data2, else set it to data2.

    All transaction types except add/add_big/add_little require two parameters.

    firewire-request will print the value returned by the device, which is the old register value at the beginning of the transaction.

firewire-request device fcp data
    Send the message data to the device's FCP command register, and print the response returned by the device to the local FCP response register.

firewire-request device reset|long_reset
    Issue a bus reset on the bus connected to device.

OPTIONS

-D, --dump-register-names
    Print register names that can be used as address, and exit.

-v, --verbose
    When used together with --dump-register-names, print the complete list of register names.

-h, --help
    Print a summary of the command-line options and exit.

-V, --version
    Print the version number of firewire-request on the standard output and exit.

NOTES
Whether you can access a device depends on the permissions set for its device file. Usually, most devices require root privileges.

BUGS
Report bugs to <"linux1394-devel@sourceforge.net">.
"linux-firewire-utils" home page: <"https://git.kernel.org/pub/scm/utils/ieee1394/linux-firewire-utils.git/">.

SEE ALSO
lsfirewire(8), firewire-phy-command(8)