New 1-Wire bus implementation. 1-Wire controller is abstracted, though

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)

4 files changed, 36 insertions, 0 deletions

diff --git a/sys/modules/ow/Makefile b/sys/modules/ow/Makefile
new file mode 100644
index 0000000..13d7739
--- /dev/null
+++ b/sys/modules/ow/Makefile
@@ -0,0 +1,8 @@
+# $FreeBSD$
+
+SYSDIR?=${.CURDIR}/../..
+.include "${SYSDIR}/conf/kern.opts.mk"
+
+SUBDIR = ow owc ow_temp
+
+.include <bsd.subdir.mk>
diff --git a/sys/modules/ow/ow/Makefile b/sys/modules/ow/ow/Makefile
new file mode 100644
index 0000000..4963406
--- /dev/null
+++ b/sys/modules/ow/ow/Makefile
@@ -0,0 +1,9 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../../dev/ow
+
+KMOD=	ow
+SRCS=	ow.c
+SRCS+=	own_if.c own_if.h owll_if.c owll_if.h bus_if.h device_if.h
+
+.include <bsd.kmod.mk>
diff --git a/sys/modules/ow/ow_temp/Makefile b/sys/modules/ow/ow_temp/Makefile
new file mode 100644
index 0000000..6bd623e
--- /dev/null
+++ b/sys/modules/ow/ow_temp/Makefile
@@ -0,0 +1,9 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../../dev/ow
+
+KMOD=	ow_temp
+SRCS=	ow_temp.c
+SRCS+=	own_if.h bus_if.h device_if.h
+
+.include <bsd.kmod.mk>
diff --git a/sys/modules/ow/owc/Makefile b/sys/modules/ow/owc/Makefile
new file mode 100644
index 0000000..4aaccf9
--- /dev/null
+++ b/sys/modules/ow/owc/Makefile
@@ -0,0 +1,10 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../../dev/ow
+
+KMOD=	owc
+SRCS=	owc_gpiobus.c
+SRCS+=	gpio_if.h gpiobus_if.h owll_if.h ofw_bus_if.h bus_if.h device_if.h
+SRCS+=	opt_platform.h
+
+.include <bsd.kmod.mk>