MI driver for the Microchip 3x0x series of SAR analog to digital converters.
This commit is contained in:
phx
parent
28112cf720
commit
d643dd143b
@ -1,4 +1,4 @@
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# $NetBSD: mi,v 1.1504 2015/08/17 06:50:03 knakahara Exp $
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# $NetBSD: mi,v 1.1505 2015/08/18 15:54:20 phx Exp $
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#
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#
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# Note: don't delete entries from here - mark them as "obsolete" instead.
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# Note: don't delete entries from here - mark them as "obsolete" instead.
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#
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#
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@ -1391,6 +1391,7 @@
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./usr/share/man/cat4/mcclock.0 man-sys-catman .cat
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./usr/share/man/cat4/mcclock.0 man-sys-catman .cat
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./usr/share/man/cat4/mcd.0 man-sys-catman .cat
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./usr/share/man/cat4/mcd.0 man-sys-catman .cat
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./usr/share/man/cat4/mcp23s17gpio.0 man-sys-catman .cat
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./usr/share/man/cat4/mcp23s17gpio.0 man-sys-catman .cat
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./usr/share/man/cat4/mcp3kadc.0 man-sys-catman .cat
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./usr/share/man/cat4/mcp980x.0 man-sys-catman .cat
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./usr/share/man/cat4/mcp980x.0 man-sys-catman .cat
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./usr/share/man/cat4/md.0 man-sys-catman .cat
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./usr/share/man/cat4/md.0 man-sys-catman .cat
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./usr/share/man/cat4/mfb.0 man-sys-catman .cat
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./usr/share/man/cat4/mfb.0 man-sys-catman .cat
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@ -4415,6 +4416,7 @@
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./usr/share/man/html4/mcclock.html man-sys-htmlman html
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./usr/share/man/html4/mcclock.html man-sys-htmlman html
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./usr/share/man/html4/mcd.html man-sys-htmlman html
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./usr/share/man/html4/mcd.html man-sys-htmlman html
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./usr/share/man/html4/mcp23s17gpio.html man-sys-htmlman html
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./usr/share/man/html4/mcp23s17gpio.html man-sys-htmlman html
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./usr/share/man/html4/mcp3kadc.html man-sys-htmlman html
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./usr/share/man/html4/mcp980x.html man-sys-htmlman html
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./usr/share/man/html4/mcp980x.html man-sys-htmlman html
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./usr/share/man/html4/md.html man-sys-htmlman html
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./usr/share/man/html4/md.html man-sys-htmlman html
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./usr/share/man/html4/mfb.html man-sys-htmlman html
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./usr/share/man/html4/mfb.html man-sys-htmlman html
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@ -7289,6 +7291,7 @@
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./usr/share/man/man4/mcclock.4 man-sys-man .man
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./usr/share/man/man4/mcclock.4 man-sys-man .man
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./usr/share/man/man4/mcd.4 man-sys-man .man
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./usr/share/man/man4/mcd.4 man-sys-man .man
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./usr/share/man/man4/mcp23s17gpio.4 man-sys-man .man
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./usr/share/man/man4/mcp23s17gpio.4 man-sys-man .man
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./usr/share/man/man4/mcp3kadc.4 man-sys-man .man
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./usr/share/man/man4/mcp980x.4 man-sys-man .man
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./usr/share/man/man4/mcp980x.4 man-sys-man .man
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./usr/share/man/man4/md.4 man-sys-man .man
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./usr/share/man/man4/md.4 man-sys-man .man
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./usr/share/man/man4/mfb.4 man-sys-man .man
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./usr/share/man/man4/mfb.4 man-sys-man .man
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@ -1,4 +1,4 @@
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# LIST OF CHANGES FROM LAST RELEASE: <$Revision: 1.2094 $>
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# LIST OF CHANGES FROM LAST RELEASE: <$Revision: 1.2095 $>
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#
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#
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#
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#
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# [Note: This file does not mention every change made to the NetBSD source tree.
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# [Note: This file does not mention every change made to the NetBSD source tree.
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@ -187,3 +187,4 @@ Changes from NetBSD 7.0 to NetBSD 8.0:
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libc: Update to tzcode2015f. [christos 20150813]
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libc: Update to tzcode2015f. [christos 20150813]
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gdb(1): Updated to 7.9.1. [christos 20150818]
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gdb(1): Updated to 7.9.1. [christos 20150818]
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acpi(4): Updated ACPICA to 20150717. [christos 20150818]
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acpi(4): Updated ACPICA to 20150717. [christos 20150818]
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mcp3kadc(4): Driver for Microchip 3x0x SAR ADC chips. [phx 20150818]
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@ -1,4 +1,4 @@
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# $NetBSD: Makefile,v 1.620 2015/05/13 07:28:49 mlelstv Exp $
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# $NetBSD: Makefile,v 1.621 2015/08/18 15:54:20 phx Exp $
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# @(#)Makefile 8.1 (Berkeley) 6/18/93
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# @(#)Makefile 8.1 (Berkeley) 6/18/93
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MAN= aac.4 ac97.4 acardide.4 aceride.4 acphy.4 \
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MAN= aac.4 ac97.4 acardide.4 aceride.4 acphy.4 \
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@ -127,7 +127,7 @@ MAN+= dbcool.4 g760a.4 lmenv.4 lmtemp.4 mcp980x.4 mpl115a.4 sdtemp.4 \
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smscmon.4 spdmem.4 tps65217pmic.4
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smscmon.4 spdmem.4 tps65217pmic.4
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# machine-independent SPI devices
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# machine-independent SPI devices
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MAN += m25p.4 mcp23s17gpio.4 tm121temp.4
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MAN += m25p.4 mcp23s17gpio.4 mcp3kadc.4 tm121temp.4
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# machine-independent SD/MMC devices
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# machine-independent SD/MMC devices
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MAN += sbt.4 sdhc.4 sdmmc.4
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MAN += sbt.4 sdhc.4 sdmmc.4
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94
share/man/man4/mcp3kadc.4
Normal file
94
share/man/man4/mcp3kadc.4
Normal file
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.\" $NetBSD: mcp3kadc.4,v 1.1 2015/08/18 15:54:20 phx Exp $
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.\"
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.\" Copyright (c) 2015 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Frank Wille.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd August 18, 2015
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.Dt MCP3KADC 4
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.Os
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.Sh NAME
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.Nm mcp3kadc
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.Nd Microchip 3x0x SAR analog to digital converter
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.Sh SYNOPSIS
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.Cd "mcp3kadc* at spi? slave ? flags N"
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.Sh DESCRIPTION
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The
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.Nm
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driver reports the current voltage on the chip's ADC channels through the
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.Xr envsys 4
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API. The driver calculates these values according to the currently selected
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reference voltage (
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.Li Vref
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). It can be changed
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through the
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.Xr sysctl 8
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node
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.Li hw.mcp3kadc0.vref .
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.Pp
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The following table shows the supported chips. The type of the chip can
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be selected with the
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.Ar flags
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argument in the config file.
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.Bl -column "Designation" "Resolution" "Input Channels" "flags" -offset indent
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.It Sy "Designation" Ta Sy "Resolution" Ta Sy "Input Channels" Ta Sy "flags"
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.It Li "MCP3001" Ta "10 bits" Ta "1" Ta "0"
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.It Li "MCP3002" Ta "10 bits" Ta "2" Ta "1"
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.It Li "MCP3004" Ta "10 bits" Ta "4" Ta "2"
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.It Li "MCP3008" Ta "10 bits" Ta "8" Ta "3"
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.It Li "MCP3201" Ta "12 bits" Ta "1" Ta "4"
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.It Li "MCP3202" Ta "12 bits" Ta "2" Ta "5"
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.It Li "MCP3204" Ta "12 bits" Ta "4" Ta "6"
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.It Li "MCP3208" Ta "12 bits" Ta "8" Ta "7"
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.It Li "MCP3301" Ta "13 bits" Ta "1" Ta "8"
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.It Li "MCP3302" Ta "13 bits" Ta "4" Ta "9"
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.It Li "MCP3304" Ta "13 bits" Ta "8" Ta "10"
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.El
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.Sh SYSCTL VARIABLES
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The following
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.Xr sysctl 3
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variables are provided:
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.Bl -tag -width indent
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.It hw.mcp3kadc0.vref
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Defines the reference voltage on the chip's
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.Li Vref
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pin in millivolts (mV). It defaults to the ADC's maximum output value + 1
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in millivolts (e.g., 4096 for a 12-bit ADC).
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.El
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.Sh SEE ALSO
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.Xr spi 4 ,
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.Xr envsys 4 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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driver first appeared in
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.Nx 8.0 .
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Frank Wille .
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@ -1,5 +1,5 @@
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#
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#
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# $NetBSD: RPI,v 1.63 2015/04/18 13:43:45 skrll Exp $
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# $NetBSD: RPI,v 1.64 2015/08/18 15:54:20 phx Exp $
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#
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#
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# RPi -- Raspberry Pi
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# RPi -- Raspberry Pi
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#
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#
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@ -144,6 +144,10 @@ iic* at i2cbus?
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bcmspi* at obio?
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bcmspi* at obio?
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spi* at spibus?
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spi* at spibus?
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# MCP3x0x ADC
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# flags selects the actual chip, refer to mcp3kadc(4)
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#mcp3kadc0 at spi? slave 0 flags 0
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# PIFace or other boards using that chip (needs gpio)
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# PIFace or other boards using that chip (needs gpio)
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#mcp23s17gpio0 at spi? slave 0 flags 0
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#mcp23s17gpio0 at spi? slave 0 flags 0
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#mcp23s17gpio1 at spi? slave 0 flags 1
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#mcp23s17gpio1 at spi? slave 0 flags 1
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@ -1,4 +1,4 @@
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# $NetBSD: files.spi,v 1.4 2014/04/06 17:59:39 kardel Exp $
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# $NetBSD: files.spi,v 1.5 2015/08/18 15:54:20 phx Exp $
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define spibus { }
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define spibus { }
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@ -35,3 +35,8 @@ file dev/spi/mcp48x1.c mcp48x1dac
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device mcp23s17gpio: gpiobus
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device mcp23s17gpio: gpiobus
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attach mcp23s17gpio at spi
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attach mcp23s17gpio at spi
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file dev/spi/mcp23s17.c mcp23s17gpio
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file dev/spi/mcp23s17.c mcp23s17gpio
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# MCP3x0x ADC
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device mcp3kadc: sysmon_envsys
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attach mcp3kadc at spi
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file dev/spi/mcp3k.c mcp3kadc
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368
sys/dev/spi/mcp3k.c
Normal file
368
sys/dev/spi/mcp3k.c
Normal file
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/* $NetBSD: mcp3k.c,v 1.1 2015/08/18 15:54:20 phx Exp $ */
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/*-
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* Copyright (c) 2015 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Frank Wille.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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|
* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Microchip MCP3x0x SAR analog to digital converters.
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* The driver supports various ADCs with different resolutions, operation
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* modes and number of input channels.
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* The reference voltage Vref defaults to the maximum output value in mV,
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* but can be changed via sysctl(3).
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*
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* MCP3001: http://ww1.microchip.com/downloads/en/DeviceDoc/21293C.pdf
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* MCP3002: http://ww1.microchip.com/downloads/en/DeviceDoc/21294E.pdf
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* MCP3004/3008: http://ww1.microchip.com/downloads/en/DeviceDoc/21295C.pdf
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* MCP3201: http://ww1.microchip.com/downloads/en/DeviceDoc/21290D.pdf
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* MCP3204/3208: http://ww1.microchip.com/downloads/en/DeviceDoc/21298c.pdf
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* MCP3301: http://ww1.microchip.com/downloads/en/DeviceDoc/21700E.pdf
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* MPC3302/3304: http://ww1.microchip.com/downloads/en/DeviceDoc/21697F.pdf
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#include <dev/sysmon/sysmonvar.h>
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#include <dev/spi/spivar.h>
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#define M3K_MAX_SENSORS 16 /* 8 single-ended & 8 diff. */
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/* mcp3x0x model description */
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struct mcp3kadc_model {
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uint32_t name;
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uint8_t bits;
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uint8_t channels;
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uint8_t lead; /* leading bits to ignore */
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uint8_t flags;
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#define M3K_SGLDIFF 0x01 /* single-ended/differential */
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#define M3K_D2D1D0 0x02 /* 3 channel select bits */
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#define M3K_MSBF 0x04 /* MSBF select bit */
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#define M3K_SIGNED 0x80 /* result is signed */
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#define M3K_CTRL_NEEDED (M3K_SGLDIFF | M3K_D2D1D0 | M3K_MSBF)
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};
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struct mcp3kadc_softc {
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device_t sc_dev;
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struct spi_handle *sc_sh;
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int sc_model;
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uint32_t sc_adc_max;
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int32_t sc_vref_mv;
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struct sysmon_envsys *sc_sme;
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envsys_data_t sc_sensors[M3K_MAX_SENSORS];
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};
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static int mcp3kadc_match(device_t, cfdata_t, void *);
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static void mcp3kadc_attach(device_t, device_t, void *);
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static void mcp3kadc_envsys_refresh(struct sysmon_envsys *,
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envsys_data_t *);
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static int sysctl_mcp3kadc_vref(SYSCTLFN_ARGS);
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CFATTACH_DECL_NEW(mcp3kadc, sizeof(struct mcp3kadc_softc),
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mcp3kadc_match, mcp3kadc_attach, NULL, NULL);
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static struct mcp3kadc_model mcp3k_models[] = {
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{
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.name = 3001,
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.bits = 10,
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.channels = 1,
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.lead = 3,
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.flags = 0
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},
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{
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.name = 3002,
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.bits = 10,
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.channels = 2,
|
||||||
|
.lead = 2,
|
||||||
|
.flags = M3K_SGLDIFF | M3K_MSBF
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.name = 3004,
|
||||||
|
.bits = 10,
|
||||||
|
.channels = 4,
|
||||||
|
.lead = 2,
|
||||||
|
.flags = M3K_SGLDIFF | M3K_D2D1D0
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.name = 3008,
|
||||||
|
.bits = 10,
|
||||||
|
.channels = 8,
|
||||||
|
.lead = 2,
|
||||||
|
.flags = M3K_SGLDIFF | M3K_D2D1D0
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.name = 3201,
|
||||||
|
.bits = 12,
|
||||||
|
.channels = 1,
|
||||||
|
.lead = 3,
|
||||||
|
.flags = 0
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.name = 3202,
|
||||||
|
.bits = 12,
|
||||||
|
.channels = 2,
|
||||||
|
.lead = 2,
|
||||||
|
.flags = M3K_SGLDIFF | M3K_MSBF
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.name = 3204,
|
||||||
|
.bits = 12,
|
||||||
|
.channels = 4,
|
||||||
|
.lead = 2,
|
||||||
|
.flags = M3K_SGLDIFF | M3K_D2D1D0
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.name = 3208,
|
||||||
|
.bits = 12,
|
||||||
|
.channels = 8,
|
||||||
|
.lead = 2,
|
||||||
|
.flags = M3K_SGLDIFF | M3K_D2D1D0
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.name = 3301,
|
||||||
|
.bits = 13,
|
||||||
|
.channels = 1,
|
||||||
|
.lead = 3,
|
||||||
|
.flags = M3K_SIGNED
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.name = 3302,
|
||||||
|
.bits = 13,
|
||||||
|
.channels = 4,
|
||||||
|
.lead = 2,
|
||||||
|
.flags = M3K_SIGNED | M3K_SGLDIFF | M3K_D2D1D0
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.name = 3204,
|
||||||
|
.bits = 13,
|
||||||
|
.channels = 8,
|
||||||
|
.lead = 2,
|
||||||
|
.flags = M3K_SIGNED | M3K_SGLDIFF | M3K_D2D1D0
|
||||||
|
},
|
||||||
|
};
|
||||||
|
|
||||||
|
static int
|
||||||
|
mcp3kadc_match(device_t parent, cfdata_t cf, void *aux)
|
||||||
|
{
|
||||||
|
struct spi_attach_args *sa = aux;
|
||||||
|
|
||||||
|
if (strcmp(cf->cf_name, "mcp3kadc") != 0)
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
/* configure for 1MHz */
|
||||||
|
if (spi_configure(sa->sa_handle, SPI_MODE_0, 1000000))
|
||||||
|
return 0;
|
||||||
|
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
mcp3kadc_attach(device_t parent, device_t self, void *aux)
|
||||||
|
{
|
||||||
|
const struct sysctlnode *rnode, *node;
|
||||||
|
struct spi_attach_args *sa;
|
||||||
|
struct mcp3kadc_softc *sc;
|
||||||
|
struct mcp3kadc_model *model;
|
||||||
|
int ch, i;
|
||||||
|
|
||||||
|
sa = aux;
|
||||||
|
sc = device_private(self);
|
||||||
|
sc->sc_dev = self;
|
||||||
|
sc->sc_sh = sa->sa_handle;
|
||||||
|
|
||||||
|
/* device flags define the model */
|
||||||
|
sc->sc_model = device_cfdata(sc->sc_dev)->cf_flags;
|
||||||
|
model = &mcp3k_models[sc->sc_model];
|
||||||
|
|
||||||
|
aprint_naive(": Analog to Digital converter\n");
|
||||||
|
aprint_normal(": MCP%u %u-channel %u-bit ADC\n",
|
||||||
|
(unsigned)model->name, (unsigned)model->channels,
|
||||||
|
(unsigned)model->bits);
|
||||||
|
|
||||||
|
/* set a default Vref in mV according to the chip's ADC resolution */
|
||||||
|
sc->sc_vref_mv = 1 << ((model->flags & M3K_SIGNED) ?
|
||||||
|
model->bits - 1 : model->bits);
|
||||||
|
|
||||||
|
/* remember maximum value for this ADC - also used for masking */
|
||||||
|
sc->sc_adc_max = (1 << model->bits) - 1;
|
||||||
|
|
||||||
|
/* attach voltage sensors to envsys */
|
||||||
|
sc->sc_sme = sysmon_envsys_create();
|
||||||
|
|
||||||
|
/* adc difference from two neighbouring channels */
|
||||||
|
for (ch = 0; ch < model->channels; ch++) {
|
||||||
|
KASSERT(ch < M3K_MAX_SENSORS);
|
||||||
|
sc->sc_sensors[ch].units = ENVSYS_SVOLTS_DC;
|
||||||
|
sc->sc_sensors[ch].state = ENVSYS_SINVALID;
|
||||||
|
if (model->channels == 1)
|
||||||
|
strlcpy(sc->sc_sensors[ch].desc, "adc diff ch0",
|
||||||
|
sizeof(sc->sc_sensors[ch].desc));
|
||||||
|
else
|
||||||
|
snprintf(sc->sc_sensors[ch].desc,
|
||||||
|
sizeof(sc->sc_sensors[ch].desc),
|
||||||
|
"adc diff ch%d-ch%d", ch, ch ^ 1);
|
||||||
|
sc->sc_sensors[ch].private = ch;
|
||||||
|
sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensors[ch]);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (model->flags & M3K_SGLDIFF) {
|
||||||
|
/* adc from single ended channels */
|
||||||
|
for (i = 0; i < model->channels; i++, ch++) {
|
||||||
|
KASSERT(ch < M3K_MAX_SENSORS);
|
||||||
|
sc->sc_sensors[ch].units = ENVSYS_SVOLTS_DC;
|
||||||
|
sc->sc_sensors[ch].state = ENVSYS_SINVALID;
|
||||||
|
snprintf(sc->sc_sensors[ch].desc,
|
||||||
|
sizeof(sc->sc_sensors[ch].desc),
|
||||||
|
"adc single ch%d", i);
|
||||||
|
sc->sc_sensors[ch].private = ch;
|
||||||
|
sysmon_envsys_sensor_attach(sc->sc_sme,
|
||||||
|
&sc->sc_sensors[ch]);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
sc->sc_sme->sme_name = device_xname(self);
|
||||||
|
sc->sc_sme->sme_refresh = mcp3kadc_envsys_refresh;
|
||||||
|
sc->sc_sme->sme_cookie = sc;
|
||||||
|
if (sysmon_envsys_register(sc->sc_sme)) {
|
||||||
|
aprint_error_dev(self, "unable to register with sysmon\n");
|
||||||
|
sysmon_envsys_destroy(sc->sc_sme);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* create a sysctl node for adjusting the ADC's reference voltage */
|
||||||
|
rnode = node = NULL;
|
||||||
|
sysctl_createv(NULL, 0, NULL, &rnode,
|
||||||
|
CTLFLAG_READWRITE,
|
||||||
|
CTLTYPE_NODE, device_xname(sc->sc_dev), NULL,
|
||||||
|
NULL, 0, NULL, 0,
|
||||||
|
CTL_HW, CTL_CREATE, CTL_EOL);
|
||||||
|
|
||||||
|
if (rnode != NULL)
|
||||||
|
sysctl_createv(NULL, 0, NULL, &node,
|
||||||
|
CTLFLAG_READWRITE | CTLFLAG_OWNDESC,
|
||||||
|
CTLTYPE_INT, "vref",
|
||||||
|
SYSCTL_DESCR("ADC reference voltage"),
|
||||||
|
sysctl_mcp3kadc_vref, 0, (void *)sc, 0,
|
||||||
|
CTL_HW, rnode->sysctl_num, CTL_CREATE, CTL_EOL);
|
||||||
|
}
|
||||||
|
|
||||||
|
static void
|
||||||
|
mcp3kadc_envsys_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
|
||||||
|
{
|
||||||
|
struct mcp3kadc_softc *sc;
|
||||||
|
struct mcp3kadc_model *model;
|
||||||
|
uint8_t buf[2], ctrl;
|
||||||
|
int32_t val, scale;
|
||||||
|
|
||||||
|
sc = sme->sme_cookie;
|
||||||
|
model = &mcp3k_models[sc->sc_model];
|
||||||
|
scale = sc->sc_adc_max + 1;
|
||||||
|
|
||||||
|
if (model->flags & M3K_CTRL_NEEDED) {
|
||||||
|
/* we need to send some control bits first */
|
||||||
|
ctrl = 1; /* start bit */
|
||||||
|
|
||||||
|
if (model->flags & M3K_SGLDIFF) {
|
||||||
|
/* bit set to select single-ended mode */
|
||||||
|
ctrl <<= 1;
|
||||||
|
ctrl |= edata->private >= model->channels;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (model->flags & M3K_D2D1D0) {
|
||||||
|
/* 3 bits select the channel */
|
||||||
|
ctrl <<= 3;
|
||||||
|
ctrl |= edata->private & (model->channels - 1);
|
||||||
|
} else {
|
||||||
|
/* 1 bit selects between two channels */
|
||||||
|
ctrl <<= 1;
|
||||||
|
ctrl |= edata->private & 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (model->flags & M3K_MSBF) {
|
||||||
|
/* bit select MSB first format */
|
||||||
|
ctrl <<= 1;
|
||||||
|
ctrl |= 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* send control bits, receive ADC data */
|
||||||
|
if (spi_send_recv(sc->sc_sh, 1, &ctrl, 2, buf) != 0) {
|
||||||
|
edata->state = ENVSYS_SINVALID;
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
|
||||||
|
/* just read data from the ADC */
|
||||||
|
if (spi_recv(sc->sc_sh, 2, buf) != 0) {
|
||||||
|
edata->state = ENVSYS_SINVALID;
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/* extract big-endian ADC data from buffer */
|
||||||
|
val = (buf[0] << 8) | buf[1];
|
||||||
|
val = (val >> (16 - (model->bits + model->lead))) & sc->sc_adc_max;
|
||||||
|
|
||||||
|
/* sign-extend the result, when needed */
|
||||||
|
if (model->flags & M3K_SIGNED) {
|
||||||
|
if (val & (1 << (model->bits - 1)))
|
||||||
|
val -= sc->sc_adc_max + 1;
|
||||||
|
scale >>= 1; /* MSB is the sign */
|
||||||
|
}
|
||||||
|
|
||||||
|
/* scale the value for Vref and convert to mV */
|
||||||
|
edata->value_cur = (sc->sc_vref_mv * val / scale) * 1000;
|
||||||
|
edata->state = ENVSYS_SVALID;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
sysctl_mcp3kadc_vref(SYSCTLFN_ARGS)
|
||||||
|
{
|
||||||
|
struct sysctlnode node;
|
||||||
|
struct mcp3kadc_softc *sc;
|
||||||
|
int32_t t;
|
||||||
|
int error;
|
||||||
|
|
||||||
|
node = *rnode;
|
||||||
|
sc = node.sysctl_data;
|
||||||
|
|
||||||
|
t = sc->sc_vref_mv;
|
||||||
|
node.sysctl_data = &t;
|
||||||
|
|
||||||
|
error = sysctl_lookup(SYSCTLFN_CALL(&node));
|
||||||
|
if (error || newp == NULL)
|
||||||
|
return error;
|
||||||
|
if (t <= 0)
|
||||||
|
return EINVAL;
|
||||||
|
|
||||||
|
sc->sc_vref_mv = t;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user