1.\" $OpenBSD: gdiumiic.4,v 1.2 2013/07/16 16:05:49 schwarze Exp $ 2.\" 3.\" Copyright (c) 2006 Alexander Yurchenko <grange@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 GDIUMIIC 4 loongson 19.Os 20.Sh NAME 21.Nm gdiumiic 22.Nd Gdium specific GPIO I2C controller 23.Sh SYNOPSIS 24.Cd "gdiumiic0 at gpio0 offset 6 mask 0x81" 25.Cd "gdiumiic0 at gpio0 offset 46 mask 0x03" 26.Cd "iic0 at gdiumiic0" 27.Sh DESCRIPTION 28The 29.Nm 30driver allows bit-banging an I2C bus as a master using two GPIO pins. 31The first pin is used as a serial clock (SCL) signal and the second as 32a serial data (SDA). 33Both GPIO pins must be able to drive an output and the SDA pin must be 34also able to read an input. 35.Pp 36The 37.Nm 38driver is derived from the 39.Nm gpioiic 40driver, using a different pin ordering, and knowledge of the Gdium I2C bus 41configuration. 42.Sh SEE ALSO 43.Xr gpio 4 , 44.Xr gpioiic 4 , 45.Xr iic 4 , 46.Xr intro 4 47.Sh AUTHORS 48.An -nosplit 49The original 50.Nm gpioiic 51driver was written by 52.An Alexander Yurchenko Aq Mt grange@openbsd.org . 53