.\"	$NetBSD: ssdfb.4,v 1.3 2019/03/17 11:20:36 wiz Exp $
.\"
.\" Copyright (c) 2019 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Tobias Nygren.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    notice, this list of conditions and the following disclaimer.
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.Dd March 17, 2019
.Dt SSDFB 4
.Os
.Sh NAME
.Nm ssdfb
.Nd OLED/PLED framebuffer device driver
.Sh SYNOPSIS
.Cd "options FONT_SPLEEN5x8"
.Cd "ssdfb* at iic? addr ?"
.Cd "ssdfb* at iic? addr 0x3c"
.Cd "ssdfb* at iic? addr 0x3d flags 0x102"
.Cd "wsdisplay* at ssdfb?"
.Sh DESCRIPTION
The
.Nm
driver provides
.Xr wsdisplay 4
support for OLED/PLED framebuffer modules based on one
of the following controller chips:
.Bl -bullet -offset indent
.It
Solomon Systech Ltd SSD1306
.It
Sino Wealth Electronic Ltd SH1106
.El
.Pp
The following products (controller + panel assemblies) are supported:
.Bl -bullet -offset indent
.It
.Em 0x01 :
Generic SSD1306 modules using default settings
.It
.Em 0x02 :
Generic SH1106 modules using default settings
.It
.Em 0x03 :
Adafruit Industries, LLC product 938 (128x64)
.It
.Em 0x04 :
Adafruit Industries, LLC product 931 (128x32)
.El
.Pp
The flags value can contain one or more of the following, bitwise OR'ed:
.Bl -bullet -offset indent
.It
.Em 0x0?? :
Exactly one product id from the above list
.It
.Em 0x100 :
indicates that the display is mounted upside down and flips the screen
.It
.Em 0x200 :
enable inverse video
.It
.Em 0x400 :
forcibly attach as console
.El
.Sh SEE ALSO
.Xr iic 4 ,
.Xr wsdisplay 4
.Sh HISTORY
An
.Nm
driver first appeared in
.Ox 6.4
and later in
.Nx 9.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver
was written by
.An Tobias Nygren Aq Mt tnn@NetBSD.org .
.Pp
It was inspired by (and shares its name with) the
.Ox
driver written by
.An Patrick Wildt Aq Mt patrick@blueri.se
but does not share any code.
.Sh BUGS
Some modules can be reconfigured to attach via
.Xr spi 4 ,
typically by moving surface mount zero ohm resistors.
This is currently not supported.