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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)
79 lines
2.3 KiB
Objective-C
79 lines
2.3 KiB
Objective-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, 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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#include <sys/bus.h>
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#include <dev/ow/ow.h>
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INTERFACE own;
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#
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# Dallas Semiconductor 1-Wire bus network and transport layer (own)
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#
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# See Maxim Application Note AN937: Book of iButton Standards for the
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# 1-Wire protocol specification.
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# http://pdfserv.maximintegrated.com/en/an/AN937.pdf
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#
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# Note: 1-Wire is a registered trademark of Maxim Integrated Products, Inc.
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#
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#
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# Send a command up the stack.
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#
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METHOD int send_command {
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device_t ndev; /* Network (bus) level device */
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device_t pdev; /* Device to send command for */
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struct ow_cmd *cmd; /* Pointer to filled in command */
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};
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#
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# Grab exclusive use of the bus (advisory)
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#
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METHOD int acquire_bus {
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device_t ndev;
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device_t pdev;
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int how;
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};
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#
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# Release exclusive use of the bus (advisory)
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#
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METHOD void release_bus {
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device_t ndev;
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device_t pdev;
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};
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#
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# Compute a CRC for a given range of bytes
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#
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METHOD uint8_t crc {
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device_t ndev;
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device_t pdev;
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uint8_t *buffer;
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size_t len;
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};
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