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All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by the University of .\" California, Berkeley and its contributors. .\" 4. Neither the name of the University nor the names of its contributors .\" may be used to endorse or promote products derived from this software .\" without specific prior written permission. .\" .\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE .\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF .\" SUCH DAMAGE. .\" .\" @(#)hil.4 8.1 (Berkeley) 6/9/93 .\" .Dd June 9, 1993 .Dt HIL 4 hp300 .Os .Sh NAME .Nm hil .Nd Human Interface Link device driver .Sh DESCRIPTION The Human Interface Link .Pq Tn HIL is the interface used by the Series 300 computers to connect devices such as keyboards, mice, control knobs, and .Tn ID modules to the machine. .Pp Special files .Pa /dev/hil[1-7] refer to physical .Tn HIL devices 1 through 7. .Pa /dev/hil0 refers to the ``loop'' pseudo-device and is used for the queue allocation commands described below. In the current implementation, there can only be one keyboard and it must be the first device .Pq Li hil1 . .Pp The device file that corresponds to a particular .Tn HIL device is determined by the order of the devices on the loop. For instance, if the .Tn ID module is the second physical device on the loop, then .Pa /dev/hil2 is the special file that should be used for communication with the module. .Pp Communication with an .Tn HIL device is begun with an .Em open system call. A process may open a device already opened by another process unless the process is operating in .Tn HP-UX compatibility mode in which case it requires exclusive use of the device, or another process has the device open and is using .Tn HP-UX style device access (see .Dv HILIOCHPUX below). .Pp Input data from a device are obtained in one of two ways. Processes may use an .Tn HP-UX style interface in which the .Xr read 2 system call is used to get fixed-size input packets, or they can use a .Em shared-queue interface. The shared-queue interface avoids the system call overhead associated with the .Tn HP-UX read interface by sharing a region of memory between the system and a user process. This region consists of a circular list of 255 event packets, and a header containing the size of the queue, and its head and tail indices. The system deposits event data at the tail of the queue, a process extracts it from the head. Extracting an event is done by copying it from the queue and then updating the head appropriately (i.e. head = (head + 1) % qsize). It is up to the process to ensure that packets are removed from the queue quickly enough to prevent the queue from filling. The system, when it determines that the queue is full, will ignore future packets from the device. Devices are .Em mapped to queues via an .Xr ioctl 2. More than one device can be mapped to a single queue and one device can be mapped to several queues. Queues are implicitly unmapped by a .Xr fork 2 and thus, cannot be shared between processes. .Pp Choosing the type of interface is done on a per device basis using an .Xr ioctl , but each device can only have one interface at any given time. .Pp .Em Select may be used with either interface to detect when input data are present. With the read interface, selecting indicates when there is input for a given device. With the shared-queue interface, selecting on the loop pseudo-device .Pq Li hil0 indicates when data are present from any device on any queue while selecting on an individual device indicates when data are present for that device on any queue. .Pp .Em Close shuts down the file descriptor associated with the .Tn HIL device. The last close (system-wide) of any device removes that device from all queues it was mapped to while the last close of the loop pseudo-device unmaps all devices and deallocates all queues. .Pp .Xr Ioctl 2 is used to control the .Tn HIL device. The ioctl commands (see .Aq Pa hpdev/hilioctl.h ) listed below are separated into two groups. The first are those which provide functions identical to .Tn HP-UX . Refer to .Xr hil 7 in the .Tn HP-UX documentation for more complete descriptions of these ioctls. The second set of ioctls are specific to this implementation and are primarily related to the shared-queue interface. .Bl -tag -width HILIOCARO .It Dv HILIOCID Identify and Describe .Pp The device will return up to 11 bytes of information describing the type and characteristics of the device. At the very least, 2 bytes of information, the device .Tn ID , and the Describe Record Header will be returned. Identical to the .Tn HP-UX .Dv HILID ioctl. .It Dv HILIOCSC Report Security Code .Pp Request the security code record from a device. The security code can vary from 1 byte to 15, and is only supported by some .Tn HIL devices. Identical to the .Tn HP-UX .Dv HILSC ioctl. .It Dv HILIOCRN Report Name .Pp An ascii string of up to 15 bytes in length that describes the device is returned. Identical to the .Tn HP-UX .Dv HILRN ioctl. .It Dv HILIOCRS Report Status .Pp An ascii string of up to 15 bytes in length that describes the current status of the device is returned. Identical to the .Tn HP-UX .Dv HILRS ioctl. .It Dv HILIOCED Extended Describe .Pp Additional information of up to 15 bytes is returned describing the device. This ioctl is similar to .Tn HILIOCID , which must be used first to determine if the device supports extended describe. Identical to the .Tn HP-UX .Dv HILED ioctl. .It Dv HILIOCAROFF Disable Auto Repeat .Pp Turn off auto repeat on the keyboard while it is cooked mode. Identical to the .Tn HP-UX .Dv HILDKR ioctl. .It Dv HILIOCAR1 Enable Auto Repeat .Pp Turn on auto repeat on the keyboard while it is in raw mode. The repeat rate is set to 1/30th of a second. Identical to the .Tn HP-UX .Dv HILER1 ioctl. .It Dv HILIOCAR2 Enable Auto Repeat .Pp Turn on auto repeat on the keyboard while it is in raw mode. The repeat rate is set to 1/60th of a second. Identical to the .Tn HP-UX .Dv HILER2 ioctl. .Pp The following ioctls are specific to this implementation: .It Dv HILIOCBEEP Beep .Pp Generate a keyboard beep as defined by .Ar arg . .Ar Arg is a pointer to two bytes of information, the first is the duration of the beep (microseconds), the second is the frequency of the beep. .It Dv HILIOCALLOCQ Allocate Queue .Pp Allocate and map into user space, an .Tn HILQ structure as defined in .Aq Pa hpdev/hilioctl.h . .Ar Arg is a pointer to a .Ar hilqinfo structure (also described in .Aq Pa hpdev/hilioctl.h ) consisting of a .Pa qid and an .Pa addr . If .Pa addr is non-zero it specifies where in the address space to map the queue. If zero, the system will select a convenient location and fill in .Pa addr . .Pa Qid is filled in by the system and is a small integer used to uniquely identify this queue. This ioctl can only be issued to the loop pseudo-device. .It Dv HILIOCFREEQ Free Queue .Pp Release a previously allocated .Tn HIL event queue, unmapping it from the user's address space. .Ar Arg should point to a .Ar hilqinfo structure which contains the .Ar qid of the queue to be released. All devices that are currently mapped to the queue are unmapped. This ioctl can only be issued to the loop pseudo-device. .It Dv HILIOCMAPQ Map Device to Queue .Pp Maps this device to a previously allocated .Tn HIL event queue. .Ar Arg is a pointer to an integer containing the .Ar qid of the queue. Once a device is mapped to a queue, all event information generated by the device will be placed into the event queue at the tail. .It Dv HILIOCUNMAPQ Unmap Device from Queue .Pp Unmap this device from a previously allocated .Tn HIL event queue. .Ar Arg is a pointer to an integer containing the .Ar qid for the queue. Future events from the device are no longer placed on the event queue. .It Dv HILIOCHPUX Use HP-UX Read Interface .Pp Use .Tn HP-UX semantics for gathering data from this device. Instead of placing input events for the device on a queue, they are placed, in .Tn HP-UX format, into a buffer from which they can be obtained via .Xr read 2 . This interface is provided for backwards compatibility. Refer to the .Tn HP-UX documentation for a description of the event packet. .El .Sh FILES .Bl -tag -width /dev/hil[2-7] -compact .It Pa /dev/hil0 .Tn HIL loop pseudo device. .It Pa /dev/hil1 .Tn HIL keyboard device. .It Pa /dev/hil[2-7] Individual .Tn HIL loop devices. .El .Sh ERRORS .Bl -tag -width [EINVAL] .It Bq Er ENODEV no such HIL loop device. .It Bq Er ENXIO HIL loop is inoperative. .It Bq Er EBUSY Another HP-UX process has the device open, or another .Bx process has the device open, and is using it in .Tn HP-UX mode. .It Bq Er EINVAL Invalid .Xr ioctl specification. .It Bq Er EMFILE No more shared queues available. .El