$NetBSD: mcp980x.4,v 1.7 2020/06/14 22:30:44 rkujawa Exp $
Copyright (c) 2013 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Radoslaw Kujawa.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd July 26, 2016 .Dt MCP980X 4 .Os .Sh NAME .Nm mcp980x .Nd Microchip 9800/1/2/3 I2C temperature sensor driver .Sh SYNOPSIS .Cd "mcp980x* at iic? addr 0x48" .Sh DESCRIPTION The .Nm driver provides support for the MCP980x series of temperature sensors. It allows reporting ambient temperature through the .Xr envsys 4 API. .Sh SYSCTL VARIABLES The following .Xr sysctl 3 variable are provided: l -tag -width machdep.mcp980x0.hysteresis t Va machdep.mcp980x0.res ADC resolution (integer). Valid values are 0-3, where 0 is 9-bit (0.5 Celsius degree) and 3 is 12-bit (0.0625 Celsius degree) resolution. t Va machdep.mcp980x0.templimit If the ambient temperature exceeds this limit, the chip asserts an alert line (integer). t Va machdep.mcp980x0.hysteresis Hysteresis for temperature limit (integer). .El .Sh SEE ALSO .Xr envsys 4 .Sh HISTORY The .Nm device first appeared in .Nx 7.0 . .Sh AUTHORS .An -nosplit The .Nm driver was written by .An Radoslaw Kujawa Aq Mt radoslaw.kujawa@gmail.com . .Sh CAVEATS MCP9804 and MCP9805 chip are different and are supported by the .Xr sdtemp 4 driver.
Copyright (c) 2013 The NetBSD Foundation, Inc.
All rights reserved.
This code is derived from software contributed to The NetBSD Foundation
by Radoslaw Kujawa.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
.Dd July 26, 2016 .Dt MCP980X 4 .Os .Sh NAME .Nm mcp980x .Nd Microchip 9800/1/2/3 I2C temperature sensor driver .Sh SYNOPSIS .Cd "mcp980x* at iic? addr 0x48" .Sh DESCRIPTION The .Nm driver provides support for the MCP980x series of temperature sensors. It allows reporting ambient temperature through the .Xr envsys 4 API. .Sh SYSCTL VARIABLES The following .Xr sysctl 3 variable are provided: l -tag -width machdep.mcp980x0.hysteresis t Va machdep.mcp980x0.res ADC resolution (integer). Valid values are 0-3, where 0 is 9-bit (0.5 Celsius degree) and 3 is 12-bit (0.0625 Celsius degree) resolution. t Va machdep.mcp980x0.templimit If the ambient temperature exceeds this limit, the chip asserts an alert line (integer). t Va machdep.mcp980x0.hysteresis Hysteresis for temperature limit (integer). .El .Sh SEE ALSO .Xr envsys 4 .Sh HISTORY The .Nm device first appeared in .Nx 7.0 . .Sh AUTHORS .An -nosplit The .Nm driver was written by .An Radoslaw Kujawa Aq Mt radoslaw.kujawa@gmail.com . .Sh CAVEATS MCP9804 and MCP9805 chip are different and are supported by the .Xr sdtemp 4 driver.
p The MCP980x chip supports hysteresis and temperature limit values with a resolution of 0.5 Celsius degree, however the .Nm driver supports setting only integer values.