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)
78 lines
2.8 KiB
C
78 lines
2.8 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_OW_H
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#define DEV_OW_OW_H 1
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enum ow_device_ivars {
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OW_IVAR_FAMILY,
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OW_IVAR_ROMID
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};
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#define OW_ACCESSOR(var, ivar, type) \
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__BUS_ACCESSOR(ow, var, OW, ivar, type);
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OW_ACCESSOR(family, FAMILY, uint8_t)
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OW_ACCESSOR(romid, ROMID, uint8_t *)
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#undef OW_ACCSSOR
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/*
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* The following likely should be in the own.h file, but needs to be here to
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* avoid recursive issues when defining the own_if.m interface.
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*/
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/*
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* Generalized command structure for a 1wire bus transaction. Not all possible
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* transactions on the 1wire bus can be represented here (a notable exception
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* being both the search ROM commands), but most of them can be, allowing for
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* general transactions from userland. A lower-level interface to the link
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* layer is also provided.
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*/
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#define MAX_ROM 10
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#define MAX_XPT 32
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#define MAX_READ 32
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struct ow_cmd
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{
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uint32_t flags; /* Various flags */
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#define OW_FLAG_OVERDRIVE 1 /* Send xpt stuff overdrive speed */
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#define OW_FLAG_READ_BIT 2 /* Read a single bit after xpt_cmd */
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uint8_t rom_len; /* Number of ROM bytes to send */
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uint8_t rom_cmd[MAX_ROM]; /* Rom command to send */
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uint8_t rom_read_len; /* Number of bytes to read */
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uint8_t rom_read[MAX_ROM]; /* Extra bytes read */
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uint8_t xpt_len; /* Total transport bytes to send */
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uint8_t xpt_cmd[MAX_XPT]; /* Device specific command to send, if flagged */
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uint8_t xpt_read_len; /* Number of bytes to read after */
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uint8_t xpt_read[MAX_READ]; /* Buffer for read bytes */
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};
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typedef uint64_t romid_t;
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#endif /* DEV_OW_OW_H */
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