ae1f3df434
only gpiobus configured via FDT is supported. Bus enumeration is supported. Devices are created for each device found. 1-Wire temperature controllers are supported, but other drivers could be written. Temperatures are polled and reported via a sysctl. Errors are reported via sysctl counters. Mis-wired bus detection is included for more trouble shooting. See ow(4), owc(4) and ow_temp(4) for details of what's supported and known issues. This has been tested on Raspberry Pi-B, Pi2 and Beagle Bone Black with up to 7 devices. Differential Revision: https://reviews.freebsd.org/D2956 Relnotes: yes MFC after: 2 weeks Reviewed by: loos@ (with many insightful comments)
55 lines
2.2 KiB
C
55 lines
2.2 KiB
C
/*-
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* Copyright (c) 2015 M. Warner Losh <imp@freebsd.org>
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* All rights reserved.
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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 unmodified, this list of conditions, and the following
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* 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef DEV_OW_OWLL_H
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#define DEV_OW_OWLL_H 1
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/*
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* Generalized parameters for the mode of operation in the bus. All units
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* are in nanoseconds, and assume that all timings are < 4s.
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* See owll_if.m for timings, and refer to AN937 for details.
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*/
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struct ow_timing
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{
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uint32_t t_slot; /* Slot time */
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uint32_t t_low0; /* Time low for a 0 bit. */
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uint32_t t_low1; /* Time low for a 1 bit. */
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uint32_t t_lowr; /* Time slave holds line down per bit */
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uint32_t t_release; /* Time after t_rdv to float high */
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uint32_t t_rec; /* After sample before M low */
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uint32_t t_rdv; /* Time to poll the bit after M low */
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uint32_t t_rstl; /* Time M low on reset */
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uint32_t t_rsth; /* Time M high on reset */
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uint32_t t_pdl; /* Time S low on reset */
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uint32_t t_pdh; /* Time R high after M low on reset */
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};
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#include "owll_if.h"
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#endif /* DEV_OW_OWLL_H */
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