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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] .TH FDI 5 "April 9, 2016" .SH NAME fdi \- HAL device information file format .SH SYNOPSIS .LP .nf /usr/share/lib/xml/dtd/fdi.dtd.1 .fi .SH DESCRIPTION .LP The hardware abstraction layer facility, described in \fBhal\fR(7), uses an \fBXML\fR-based file format to merge arbitrary properties onto device objects. The way device information files works is that once all physical properties are merged onto a device object, it is tried against the set of installed device information files. Device information files are used for both merging facts and policy settings for devices. .sp .LP Each device information file has a number of match directives that are tested against the properties of the device object. The directives have the form: .sp .in +2 .nf .fi .in -2 .sp .LP If all the match directives pass, then the device information can include the following property directives in the form: .sp .in +2 .nf <[merge|append|prepend] key="property" type="[string|int|bool|..]"> .fi .in -2 .sp .LP These directives are used to merge new properties or append to existing properties on the device object. Any previously property stemming from device detection can be overridden by a device information file. .sp .LP The \fBmatch\fR, \fBmerge\fR, \fBappend\fR, and \fBprepend\fR directives require that the key attribute be either a property name on the device object in question or a path to a property on another device object. The path to a property is expressed either through direct specification of the \fBUDI\fR, such as \fB/org/freedesktop/Hal/devices/computer:foo.bar\fR or through indirect references such as "\fB@info.parent:baz\fR", meaning that the device object specified by the \fBUDI\fR in the string property "\fBinfo.parent\fR" should be used to query the property "\fBbaz\fR". It is also possible to use multiple indirections. For example, for a volume on a \fBUSB\fR memory stick, the indirection "\fB@block.storage_device:@storage.physical_device:usb.vendor_id\fR" references the "\fBusb.vendor_id\fR" property on the device object representing the \fBUSB\fR interface. .sp .LP When the property to match has been determined, the following attributes can be used within the "\fBmatch\fR" tag: .sp .ne 2 .na \fB\fBstring\fR\fR .ad .RS 20n Match a string property. For example, matches only if "\fBfoo.bar\fR" is a string property assuming the value "\fBbaz\fR". .RE .sp .ne 2 .na \fB\fBint\fR\fR .ad .RS 20n Match an integer property .RE .sp .ne 2 .na \fB\fBuint64\fR\fR .ad .RS 20n Match property with the 64-bit unsigned type .RE .sp .ne 2 .na \fB\fBbool\fR\fR .ad .RS 20n Match a boolean property .RE .sp .ne 2 .na \fB\fBdouble\fR\fR .ad .RS 20n Match a property of type double .RE .sp .ne 2 .na \fB\fBexists\fR\fR .ad .RS 20n Used as . This attribute can be used with "true" and "false", respectively to match when a property exists or does not exist. .RE .sp .ne 2 .na \fB\fBempty\fR\fR .ad .RS 20n This attribute can only be used on string properties with "true" and "false". The semantics for "true" is to match only when the string is non-empty. .RE .sp .ne 2 .na \fB\fBis_absolute_path\fR\fR .ad .RS 20n Matches only when a string property represents an absolute path (the path does not have to exist). This attribute can be can be used with "true" or "false". .RE .sp .ne 2 .na \fB\fBis_ascii\fR\fR .ad .RS 20n Matches only when a string property contains \fBASCII\fR characters. This attribute can be used with "true" or "false". .RE .sp .ne 2 .na \fB\fBcompare_lt\fR\fR .ad .RS 20n This attribute can be used with \fBint\fR, \fBuint64\fR, \fBdouble\fR and \fBstring\fR properties to compare with a constant. It matches when the given property is less than the given constant using the default ordering. .RE .sp .ne 2 .na \fB\fBcompare_le\fR\fR .ad .RS 20n Similar to \fBcompare_lt\fR, but matches when the given property is less than or equal than the given constant using the default ordering. .RE .sp .ne 2 .na \fB\fBcompare_gt\fR\fR .ad .RS 20n Similar to \fBcompare_lt\fR, but matches when the given property is greater than the given constant using the default ordering. .RE .sp .ne 2 .na \fB\fR .ad .RS 20n Similar to \fBcompare_lt\fR, but matches when the given property is greater than or equal than the given constant using the default ordering. .RE .sp .ne 2 .na \fB\fR .ad .RS 20n This attribute can only be used with \fBstring\fR and \fBstrlist\fR (string list). For a string key, this matches when the property contains the given (sub)string. For a string list, this matches if the given string matches a item in the list. .RE .sp .ne 2 .na \fB\fBcontains_ncase\fR\fR .ad .RS 20n Similar to \fBcontains\fR, but the property and the given key are converted to lowercase before it is checked. .RE .sp .LP The \fBmerge\fR, \fBappend\fR, and \fBprepend\fR directives all require the attribute type which specifies what is to be merged. The following values are supported: .sp .ne 2 .na \fB\fBstring\fR\fR .ad .RS 17n The value is copied to the property. For example, baz merges the value "baz" into the property "foo.bar". .RE .sp .ne 2 .na \fB\fBstrlist\fR\fR .ad .RS 17n For \fBmerge\fR, the value is copied to the property and the current property is overwritten. For \fBappend\fR and \fBprepend\fR, the value is appended or prepended to the list as a new item. .RE .sp .ne 2 .na \fB\fBbool\fR\fR .ad .RS 17n This attribute can merge the values "true" or "false" .RE .sp .ne 2 .na \fB\fBint\fR\fR .ad .RS 17n Merges an integer .RE .sp .ne 2 .na \fBuint64\fR .ad .RS 17n Merges an unsigned 64-bit integer .RE .sp .ne 2 .na \fB\fBdouble\fR\fR .ad .RS 17n Merges a double precision floating point number .RE .sp .ne 2 .na \fB\fBcopy_property\fR\fR .ad .RS 17n Copies the value of a given property; supports paths with direct and indirect UDI's. For example, @info.parent:baz.bat merges the value of the property "baz.bat" on the device object with the \fBUDI\fR from the property "info.parent" into the property "foo.bar" on the device object being processed. .RE .sp .LP The \fBremove\fR directive requires only a key and can be used with all keys. For \fBstrlist\fR, there is also a special syntax to remove a item from the string list. For example, to remove item "bla" from property "foo.bar", use the following syntax: .sp .in +2 .nf bla .fi .in -2 .sp .LP Device Information files are stored in the following standard hierarchy with the following default top level directories \fBinformation\fR, \fBpolicy\fR and \fBpreprobe\fR: .sp .ne 2 .na \fB\fBinformation\fR\fR .ad .RS 15n Device information files to merge device information. .sp .ne 2 .na \fB\fB10freedesktop\fR\fR .ad .RS 17n Device information files included with the \fBhal\fR tarball. .RE .sp .ne 2 .na \fB\fB20thirdparty\fR\fR .ad .RS 17n Device information files from the device manufacturer and installed from media accompanying the hardware. .RE .sp .ne 2 .na \fB\fB30user\fR\fR .ad .RS 17n Device information for specific devices. .RE .RE .sp .ne 2 .na \fB\fBpolicy\fR\fR .ad .RS 15n Device information files to merge policy properties. .sp .ne 2 .na \fB10osvendor\fR .ad .RS 16n Device information files included with the hal tarball and supplied by the operating system vendor for policy rules. .RE .sp .ne 2 .na \fB20thirdparty\fR .ad .RS 16n Policy rules from the device manufacturer and installed from media accompanying the hardware. .RE .sp .ne 2 .na \fB30user\fR .ad .RS 16n Policy rules for specific devices. .RE .RE .sp .ne 2 .na \fBpreprobe\fR .ad .RS 15n Device information files to merge information before probe devices. .sp .ne 2 .na \fB10osvendor\fR .ad .RS 16n Device information files included with the \fBhal\fR tarball and supplied by the operating system vendor. .RE .sp .ne 2 .na \fB20thirdparty\fR .ad .RS 16n Device information files from the device manufacturer and installed from media accompanying the hardware. .RE .sp .ne 2 .na \fB30user\fR .ad .RS 16n Device information for specific devices. .RE .RE .sp .LP All device information files are matched for every \fBhal\fR device object. .SH ATTRIBUTES .LP See \fBattributes\fR(7) for descriptions of the following attributes: .sp .sp .TS box; c | c l | l . ATTRIBUTE TYPE ATTRIBUTE VALUE _ Interface Stability Volatile .TE .SH SEE ALSO .LP .BR attributes (7), .BR hal (7), .BR locale (7), .BR smf (7), .BR hald (8)