05c9f26dff
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
/*-
|
|
* Copyright (c) 2015 M. Warner Losh <imp@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* 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 unmodified, 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 AUTHOR ``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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef DEV_OW_OWLL_H
|
|
#define DEV_OW_OWLL_H 1
|
|
|
|
/*
|
|
* Generalized parameters for the mode of operation in the bus. All units
|
|
* are in nanoseconds, and assume that all timings are < 4s.
|
|
* See owll_if.m for timings, and refer to AN937 for details.
|
|
*/
|
|
struct ow_timing
|
|
{
|
|
uint32_t t_slot; /* Slot time */
|
|
uint32_t t_low0; /* Time low for a 0 bit. */
|
|
uint32_t t_low1; /* Time low for a 1 bit. */
|
|
uint32_t t_lowr; /* Time slave holds line down per bit */
|
|
uint32_t t_release; /* Time after t_rdv to float high */
|
|
uint32_t t_rec; /* After sample before M low */
|
|
uint32_t t_rdv; /* Time to poll the bit after M low */
|
|
uint32_t t_rstl; /* Time M low on reset */
|
|
uint32_t t_rsth; /* Time M high on reset */
|
|
uint32_t t_pdl; /* Time S low on reset */
|
|
uint32_t t_pdh; /* Time R high after M low on reset */
|
|
};
|
|
|
|
#include "owll_if.h"
|
|
|
|
#endif /* DEV_OW_OWLL_H */
|