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 $NetBSD: umcpmioctl.8,v 1.4 2025/03/22 06:54:13 rillig Exp $

 Copyright (c) 2024 Brad Spencer <brad (at] anduin.eldar.org>

 Permission to use, copy, modify, and distribute this software for any
 purpose with or without fee is hereby granted, provided that the above
 copyright notice and this permission notice appear in all copies.

 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

.Dd November 24, 2024
.Dt UMCPMIOCTL 8
.Os
.Sh NAME
.Nm umcpmioctl
.Nd interact with a MCP2221 / MCP2221A multi-io chip
.Sh SYNOPSIS
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm status
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm get sram
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm get gp
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm get flash cs
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm get flash gp
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm get flash usbman
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm get flash usbprod
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm get flash usbsn
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm get flash chipsn
.Nm umcpmioctl
.Op Fl dh
.Ar device
.Cm put flash gp
.Ar GPn PIN_FUNCTION ...
.Sh DESCRIPTION
The
.Nm
utility interacts with a MCP2221 / MCP2221A and can be used to pull
the status of the chip, get the SRAM values, get the values from the
on-board FLASH and can be used to set some of the FLASH values
associated with the GPIO pins.
The values from flash are copied into the SRAM when the chip
enumerates or powers up.

p
For the
.Cm put flash
command,
.Ar GPn
is one of
.Cm GP0 ,
.Cm GP1 ,
.Cm GP2
or
.Cm GP3 ,
and
.Ar PIN_FUNCTION
is one of
.Cm GPIO_PIN_INPUT ,
.Cm GPIO_PIN_OUTPUT ,
.Cm GPIO_PIN_ALT0 ,
.Cm GPIO_PIN_ALT1 ,
.Cm GPIO_PIN_ALT2 ,
.Cm GPIO_PIN_ALT3 ,
.Cm DEFAULT_OUTPUT_ZERO
or
.Cm DEFAULT_OUTPUT_ONE .

p
For the
.Cm put flash
command, the
.Ar GPn
and
.Ar PIN_FUNCTION
pairs may be repeated.
.Sh EXAMPLES
.Dl "umcpmioctl /dev/umcpmio0ctl status"

p
Query the chip for its status.

p
.Dl "umcpmioctl /dev/umcpmio0ctl get sram"

p
Return the values from the SRAM on the chip.

p
.Dl "umcpmioctl /dev/umcpmio0ctl get flash cs"

p
Return the values for the chip settings from the FLASH.

p
.Dl "umcpmioctl /dev/umcpmio0ctl put flash gp GP0 GPIO_PIN_INPUT"

p
This will set the GP0 pin to be an input pin on start up of the chip.

p
.Dl "umcpmioctl /dev/umcpmio0ctl put flash gp GP2 GPIO_PIN_OUTPUT GP0 GPIO_PIN_ALT0"

p
This will set the GP2 pin to be an output pin and GP0 pin to have the
ALT0 function upon chip start up.
.Sh SEE ALSO
.Xr gpio 4 ,
.Xr umcpmio 4
.Sh HISTORY
The
.Nm
utility first appeared in
.Nx 11.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
utility was written by
.An Brad Spencer Aq Mt brad (at] anduin.eldar.org .
.Sh BUGS
Only the gpio settings can be changed in FLASH.

p
The output is not very pleasant to use and one will probably need to
have the data sheet for the MCP2221 / MCP2221A on hand to make sense of
it.