1.\" -*- nroff -*- 2.\" 3.\" Copyright (c) 2001 Alexander Langer 4.\" 5.\" All rights reserved. 6.\" 7.\" This program is free software. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR 19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, 22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd March 10, 2001 32.Dt DEVICE_IDENTIFY 9 33.Os 34.Sh NAME 35.Nm DEVICE_IDENTIFY 36.Nd identify a device, register it 37.Sh SYNOPSIS 38.Fd #include <sys/param.h> 39.Fd #include <sys/bus.h> 40.Ft void 41.Fn DEVICE_IDENTIFY "driver_t *driver" "device_t parent" 42.Sh DESCRIPTION 43.Pp 44The identify function for a device is only needed for devices on busses 45that cannot identify their childs independently, e.g. the ISA bus. 46It is used to recognize the device (usually done by accessing non-ambigous 47registers in the hardware) and to tell the kernel about it and thus 48creating a new device instance. 49.Pp 50.Xr BUS_ADD_CHILD 9 51is used to register the device as a child of the bus. 52The device's resources (such as IRQ and I/O ports) are registered 53with the kernel by calling 54.Fn bus_set_resource 55for each resource (refer to 56.Xr bus_set_resource 9 57for more information). 58.Sh EXAMPLES 59.Pp 60The following pseudo-code shows an example of a function that 61probes for a piece of hardware and registers it and its resource 62(an I/O port) with the kernel. 63It also sets the description of the device. 64.Bd -literal 65void 66foo_identify(driver_t *driver, device_t parent) 67{ 68 device_t child; 69 70 retrieve_device_information; 71 if (devices matches one of your supported devices) { 72 child = BUS_ADD_CHILD(parent, 0, "foo", -1); 73 device_set_desc_copy(child, "foo chip ver.123"); 74 device_set_driver(child, driver); 75 bus_set_resource(child, SYS_RES_IOPORT, 0, FOO_IOADDR, 1); 76 } 77} 78.Ed 79.Sh RETURN VALUES 80.Pp 81Zero is returned on success, 82otherwise an appropriate error is returned (see 83.Xr errno 2 ) . 84.Sh SEE ALSO 85.Xr device 9 , 86.Xr BUS_ADD_CHILD 9 , 87.Xr device_add_child 9 , 88.Xr device_set_desc_copy 9 , 89.Xr device_set_driver 9 , 90.Xr DEVICE_ATTACH 9 , 91.Xr DEVICE_DETACH 9 , 92.Xr DEVICE_PROBE 9 , 93.Xr DEVICE_SHUTDOWN 9 , 94.Xr bus_set_resource 9 95.Sh AUTHORS 96This man page was written by 97.An Alexander Langer Aq alex@FreeBSD.org . 98