1.\" $OpenBSD: pcaled.4,v 1.6 2013/07/16 16:05:49 schwarze Exp $ 2.\" 3.\" Copyright (c) 2006 Theo de Raadt <deraadt@openbsd.org> 4.\" 5.\" Permission to use, copy, modify, and distribute this software for any 6.\" purpose with or without fee is hereby granted, provided that the above 7.\" copyright notice and this permission notice appear in all copies. 8.\" 9.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16.\" 17.Dd $Mdocdate: July 16 2013 $ 18.Dt PCALED 4 19.Os 20.Sh NAME 21.Nm pcaled 22.Nd Philips PCA9532/PCA9552 GPIO LED dimmer 23.Sh SYNOPSIS 24.Cd "pcaled* at iic?" 25.Cd "gpio* at pcaled?" 26.Sh DESCRIPTION 27The 28.Nm 29driver provides support for the Philips PCA9532 and PCA9552 GPIO controllers 30which are specifically optimized to dim LEDs in 256 discrete steps. 31.Sh SEE ALSO 32.Xr gpio 4 , 33.Xr iic 4 , 34.Xr intro 4 , 35.Xr gpioctl 8 36.Sh HISTORY 37The 38.Nm 39driver first appeared in 40.Ox 4.0 . 41.Sh AUTHORS 42.An -nosplit 43The 44.Nm 45driver was written by 46.An Dale Rahn Aq Mt drahn@openbsd.org . 47