forked from Imagelibrary/rtems
2005-11-02 straumanatslacdotstanford.edu
* libi2c/Makefile.am, libi2c/Makefile.in, libi2c/libi2c.c, libi2c/libi2c.h: New files. * Makefile.am, configure.ac, preinstall.am, wrapup/Makefile.am: added a simple API/library for i2c devices and drivers for i2c 2-byte eeproms and a ds1621 temperature sensor; API is documented in libi2c.h
This commit is contained in:
Till Straumann
@@ -1,3 +1,11 @@
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2005-11-02 straumanatslacdotstanford.edu
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* libi2c/Makefile.am, libi2c/Makefile.in, libi2c/libi2c.c,
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libi2c/libi2c.h: New files.
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* Makefile.am, configure.ac, preinstall.am, wrapup/Makefile.am: added a
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simple API/library for i2c devices and drivers for i2c 2-byte eeproms
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and a ds1621 temperature sensor; API is documented in libi2c.h
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2005-11-02 Fredic Praca <freebsd-fr.org>
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PR 842/networking
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@@ -11,6 +11,7 @@ include $(top_srcdir)/automake/multilib.am
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SUBDIRS = . score rtems sapi posix itron
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SUBDIRS += libcsupport libblock libfs
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SUBDIRS += libnetworking librpc
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SUBDIRS += libi2c
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SUBDIRS += libmisc
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SUBDIRS += wrapup
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@@ -150,6 +151,9 @@ endif
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## rtmonuse
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include_rtems_HEADERS += libmisc/rtmonuse/rtmonuse.h
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## i2c
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include_rtems_HEADERS += libi2c/libi2c.h
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## serdbg
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if LIBSERDBG
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include_rtems_HEADERS += libmisc/serdbg/serdbgcnf.h libmisc/serdbg/serdbg.h \
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@@ -298,6 +298,7 @@ libcsupport/Makefile
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libnetworking/Makefile
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librpc/Makefile
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libmisc/Makefile
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libi2c/Makefile
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zlib/Makefile
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httpd/Makefile
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ftpd/Makefile
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2
cpukit/libi2c/.cvsignore
Normal file
2
cpukit/libi2c/.cvsignore
Normal file
@@ -0,0 +1,2 @@
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Makefile
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Makefile.in
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15
cpukit/libi2c/Makefile.am
Normal file
15
cpukit/libi2c/Makefile.am
Normal file
@@ -0,0 +1,15 @@
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##
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## $Id$
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##
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include $(top_srcdir)/automake/compile.am
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noinst_LIBRARIES = libi2c.a
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libi2c_a_SOURCES = libi2c.c libi2c.h
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## ---
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all-local: $(PREINSTALL_FILES)
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include $(top_srcdir)/automake/local.am
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478
cpukit/libi2c/Makefile.in
Normal file
478
cpukit/libi2c/Makefile.in
Normal file
@@ -0,0 +1,478 @@
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# Makefile.in generated by automake 1.9.6 from Makefile.am.
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# @configure_input@
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# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
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# 2003, 2004, 2005 Free Software Foundation, Inc.
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# This Makefile.in is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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# PARTICULAR PURPOSE.
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@SET_MAKE@
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srcdir = @srcdir@
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top_srcdir = @top_srcdir@
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VPATH = @srcdir@
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pkgdatadir = $(datadir)/@PACKAGE@
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pkglibdir = $(libdir)/@PACKAGE@
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pkgincludedir = $(includedir)/@PACKAGE@
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top_builddir = ..
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am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
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INSTALL = @INSTALL@
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install_sh_DATA = $(install_sh) -c -m 644
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install_sh_PROGRAM = $(install_sh) -c
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install_sh_SCRIPT = $(install_sh) -c
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INSTALL_HEADER = $(INSTALL_DATA)
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transform = $(program_transform_name)
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NORMAL_INSTALL = :
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PRE_INSTALL = :
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POST_INSTALL = :
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NORMAL_UNINSTALL = :
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PRE_UNINSTALL = :
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POST_UNINSTALL = :
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build_triplet = @build@
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host_triplet = @host@
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DIST_COMMON = $(srcdir)/Makefile.am $(srcdir)/Makefile.in \
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$(top_srcdir)/automake/compile.am \
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$(top_srcdir)/automake/local.am
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subdir = libi2c
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ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
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am__aclocal_m4_deps = $(top_srcdir)/aclocal/canonical-target-name.m4 \
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$(top_srcdir)/aclocal/canonicalize-tools.m4 \
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$(top_srcdir)/aclocal/check-itron.m4 \
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$(top_srcdir)/aclocal/check-multiprocessing.m4 \
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$(top_srcdir)/aclocal/check-networking.m4 \
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$(top_srcdir)/aclocal/check-newlib.m4 \
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$(top_srcdir)/aclocal/check-posix.m4 \
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$(top_srcdir)/aclocal/check-rtems-debug.m4 \
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$(top_srcdir)/aclocal/check-tool.m4 \
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$(top_srcdir)/aclocal/enable-inlines.m4 \
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$(top_srcdir)/aclocal/enable-itron.m4 \
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$(top_srcdir)/aclocal/enable-multiprocessing.m4 \
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$(top_srcdir)/aclocal/enable-networking.m4 \
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$(top_srcdir)/aclocal/enable-posix.m4 \
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$(top_srcdir)/aclocal/enable-rtems-debug.m4 \
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$(top_srcdir)/aclocal/env-rtemscpu.m4 \
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$(top_srcdir)/aclocal/gcc-pipe.m4 \
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$(top_srcdir)/aclocal/gcc-weak.m4 \
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$(top_srcdir)/aclocal/multi.m4 \
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$(top_srcdir)/aclocal/multilib.m4 \
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$(top_srcdir)/aclocal/prog-cc.m4 \
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$(top_srcdir)/aclocal/prog-ccas.m4 \
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$(top_srcdir)/aclocal/rtems-top.m4 \
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$(top_srcdir)/aclocal/sysv-ipc.m4 \
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$(top_srcdir)/aclocal/version.m4 $(top_srcdir)/acinclude.m4 \
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$(top_srcdir)/configure.ac
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$(ACLOCAL_M4)
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CONFIG_HEADER = $(top_builddir)/config.h
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CONFIG_CLEAN_FILES =
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LIBRARIES = $(noinst_LIBRARIES)
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ARFLAGS = cru
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libi2c_a_AR = $(AR) $(ARFLAGS)
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libi2c_a_LIBADD =
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||||
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||||
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||||
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||||
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||||
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||||
ETAGS = etags
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||||
CTAGS = ctags
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||||
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||||
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|
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||||
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|
||||
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|
||||
DEFS = @DEFS@
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
EGREP = @EGREP@
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||||
EXEEXT = @EXEEXT@
|
||||
HAS_ITRON_FALSE = @HAS_ITRON_FALSE@
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||||
HAS_ITRON_TRUE = @HAS_ITRON_TRUE@
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||||
HAS_MP_FALSE = @HAS_MP_FALSE@
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||||
HAS_MP_TRUE = @HAS_MP_TRUE@
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||||
HAS_NETWORKING_FALSE = @HAS_NETWORKING_FALSE@
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||||
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|
||||
HAS_POSIX_FALSE = @HAS_POSIX_FALSE@
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||||
HAS_POSIX_TRUE = @HAS_POSIX_TRUE@
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||||
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||||
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INSTALL_DATA = @INSTALL_DATA@
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||||
INSTALL_PROGRAM = @INSTALL_PROGRAM@
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||||
INSTALL_SCRIPT = @INSTALL_SCRIPT@
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||||
INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
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||||
LDFLAGS = @LDFLAGS@
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||||
LIBOBJS = @LIBOBJS@
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||||
LIBRPC_FALSE = @LIBRPC_FALSE@
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||||
LIBRPC_TRUE = @LIBRPC_TRUE@
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||||
LIBS = @LIBS@
|
||||
LIBSERDBG_FALSE = @LIBSERDBG_FALSE@
|
||||
LIBSERDBG_TRUE = @LIBSERDBG_TRUE@
|
||||
LIBSHELL_FALSE = @LIBSHELL_FALSE@
|
||||
LIBSHELL_TRUE = @LIBSHELL_TRUE@
|
||||
LTLIBOBJS = @LTLIBOBJS@
|
||||
MACROS_FALSE = @MACROS_FALSE@
|
||||
MACROS_TRUE = @MACROS_TRUE@
|
||||
MAINT = @MAINT@
|
||||
MAINTAINER_MODE_FALSE = @MAINTAINER_MODE_FALSE@
|
||||
MAINTAINER_MODE_TRUE = @MAINTAINER_MODE_TRUE@
|
||||
MAKE = @MAKE@
|
||||
MAKEINFO = @MAKEINFO@
|
||||
MULTIBUILDTOP = @MULTIBUILDTOP@
|
||||
MULTILIB_FALSE = @MULTILIB_FALSE@
|
||||
MULTILIB_TRUE = @MULTILIB_TRUE@
|
||||
MULTISUBDIR = @MULTISUBDIR@
|
||||
NEED_SYS_CDEFS_H_FALSE = @NEED_SYS_CDEFS_H_FALSE@
|
||||
NEED_SYS_CDEFS_H_TRUE = @NEED_SYS_CDEFS_H_TRUE@
|
||||
NEED_SYS_QUEUE_H_FALSE = @NEED_SYS_QUEUE_H_FALSE@
|
||||
NEED_SYS_QUEUE_H_TRUE = @NEED_SYS_QUEUE_H_TRUE@
|
||||
NEWLIB_FALSE = @NEWLIB_FALSE@
|
||||
NEWLIB_TRUE = @NEWLIB_TRUE@
|
||||
OBJEXT = @OBJEXT@
|
||||
PACKAGE = @PACKAGE@
|
||||
PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
|
||||
PACKAGE_NAME = @PACKAGE_NAME@
|
||||
PACKAGE_STRING = @PACKAGE_STRING@
|
||||
PACKAGE_TARNAME = @PACKAGE_TARNAME@
|
||||
PACKAGE_VERSION = @PACKAGE_VERSION@
|
||||
PATH_SEPARATOR = @PATH_SEPARATOR@
|
||||
PROJECT_INCLUDE = @PROJECT_INCLUDE@
|
||||
PROJECT_LIB = @PROJECT_LIB@
|
||||
RANLIB = @RANLIB@
|
||||
RTEMS_CFLAGS = @RTEMS_CFLAGS@
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||||
RTEMS_CPPFLAGS = @RTEMS_CPPFLAGS@
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||||
RTEMS_CPU = @RTEMS_CPU@
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||||
RTEMS_HAS_POSIX_API = @RTEMS_HAS_POSIX_API@
|
||||
RTEMS_PROVIDES_INTTYPES_H_FALSE = @RTEMS_PROVIDES_INTTYPES_H_FALSE@
|
||||
RTEMS_PROVIDES_INTTYPES_H_TRUE = @RTEMS_PROVIDES_INTTYPES_H_TRUE@
|
||||
RTEMS_PROVIDES_STDINT_H_FALSE = @RTEMS_PROVIDES_STDINT_H_FALSE@
|
||||
RTEMS_PROVIDES_STDINT_H_TRUE = @RTEMS_PROVIDES_STDINT_H_TRUE@
|
||||
RTEMS_TOPdir = @RTEMS_TOPdir@
|
||||
RTEMS_USE_NEWLIB = @RTEMS_USE_NEWLIB@
|
||||
SET_MAKE = @SET_MAKE@
|
||||
SHELL = @SHELL@
|
||||
STRIP = @STRIP@
|
||||
UNIX_FALSE = @UNIX_FALSE@
|
||||
UNIX_TRUE = @UNIX_TRUE@
|
||||
VERSION = @VERSION@
|
||||
ac_ct_CC = @ac_ct_CC@
|
||||
ac_ct_RANLIB = @ac_ct_RANLIB@
|
||||
ac_ct_STRIP = @ac_ct_STRIP@
|
||||
am__fastdepCC_FALSE = @am__fastdepCC_FALSE@
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
build_cpu = @build_cpu@
|
||||
build_os = @build_os@
|
||||
build_vendor = @build_vendor@
|
||||
datadir = @datadir@
|
||||
dirstamp = @dirstamp@
|
||||
exec_prefix = @exec_prefix@
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
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|
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|
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
all: all-am
|
||||
|
||||
.SUFFIXES:
|
||||
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|
||||
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|
||||
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|
||||
case '$(am__configure_deps)' in \
|
||||
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|
||||
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|
||||
&& exit 0; \
|
||||
exit 1;; \
|
||||
esac; \
|
||||
done; \
|
||||
echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign libi2c/Makefile'; \
|
||||
cd $(top_srcdir) && \
|
||||
$(AUTOMAKE) --foreign libi2c/Makefile
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
|
||||
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|
||||
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|
||||
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|
||||
-rm -f libi2c.a
|
||||
$(libi2c_a_AR) libi2c.a $(libi2c_a_OBJECTS) $(libi2c_a_LIBADD)
|
||||
$(RANLIB) libi2c.a
|
||||
|
||||
mostlyclean-compile:
|
||||
-rm -f *.$(OBJEXT)
|
||||
|
||||
distclean-compile:
|
||||
-rm -f *.tab.c
|
||||
|
||||
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|
||||
|
||||
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||||
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|
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ID: $(HEADERS) $(SOURCES) $(LISP) $(TAGS_FILES)
|
||||
list='$(SOURCES) $(HEADERS) $(LISP) $(TAGS_FILES)'; \
|
||||
unique=`for i in $$list; do \
|
||||
if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
|
||||
done | \
|
||||
$(AWK) ' { files[$$0] = 1; } \
|
||||
END { for (i in files) print i; }'`; \
|
||||
mkid -fID $$unique
|
||||
tags: TAGS
|
||||
|
||||
TAGS: $(HEADERS) $(SOURCES) $(TAGS_DEPENDENCIES) \
|
||||
$(TAGS_FILES) $(LISP)
|
||||
tags=; \
|
||||
here=`pwd`; \
|
||||
list='$(SOURCES) $(HEADERS) $(LISP) $(TAGS_FILES)'; \
|
||||
unique=`for i in $$list; do \
|
||||
if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
|
||||
done | \
|
||||
$(AWK) ' { files[$$0] = 1; } \
|
||||
END { for (i in files) print i; }'`; \
|
||||
if test -z "$(ETAGS_ARGS)$$tags$$unique"; then :; else \
|
||||
test -n "$$unique" || unique=$$empty_fix; \
|
||||
$(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
|
||||
$$tags $$unique; \
|
||||
fi
|
||||
ctags: CTAGS
|
||||
CTAGS: $(HEADERS) $(SOURCES) $(TAGS_DEPENDENCIES) \
|
||||
$(TAGS_FILES) $(LISP)
|
||||
tags=; \
|
||||
here=`pwd`; \
|
||||
list='$(SOURCES) $(HEADERS) $(LISP) $(TAGS_FILES)'; \
|
||||
unique=`for i in $$list; do \
|
||||
if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
|
||||
done | \
|
||||
$(AWK) ' { files[$$0] = 1; } \
|
||||
END { for (i in files) print i; }'`; \
|
||||
test -z "$(CTAGS_ARGS)$$tags$$unique" \
|
||||
|| $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
|
||||
$$tags $$unique
|
||||
|
||||
GTAGS:
|
||||
here=`$(am__cd) $(top_builddir) && pwd` \
|
||||
&& cd $(top_srcdir) \
|
||||
&& gtags -i $(GTAGS_ARGS) $$here
|
||||
|
||||
distclean-tags:
|
||||
-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
|
||||
|
||||
distdir: $(DISTFILES)
|
||||
$(mkdir_p) $(distdir)/../automake
|
||||
@srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`; \
|
||||
topsrcdirstrip=`echo "$(top_srcdir)" | sed 's|.|.|g'`; \
|
||||
list='$(DISTFILES)'; for file in $$list; do \
|
||||
case $$file in \
|
||||
$(srcdir)/*) file=`echo "$$file" | sed "s|^$$srcdirstrip/||"`;; \
|
||||
$(top_srcdir)/*) file=`echo "$$file" | sed "s|^$$topsrcdirstrip/|$(top_builddir)/|"`;; \
|
||||
esac; \
|
||||
if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
|
||||
dir=`echo "$$file" | sed -e 's,/[^/]*$$,,'`; \
|
||||
if test "$$dir" != "$$file" && test "$$dir" != "."; then \
|
||||
dir="/$$dir"; \
|
||||
$(mkdir_p) "$(distdir)$$dir"; \
|
||||
else \
|
||||
dir=''; \
|
||||
fi; \
|
||||
if test -d $$d/$$file; then \
|
||||
if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
|
||||
cp -pR $(srcdir)/$$file $(distdir)$$dir || exit 1; \
|
||||
fi; \
|
||||
cp -pR $$d/$$file $(distdir)$$dir || exit 1; \
|
||||
else \
|
||||
test -f $(distdir)/$$file \
|
||||
|| cp -p $$d/$$file $(distdir)/$$file \
|
||||
|| exit 1; \
|
||||
fi; \
|
||||
done
|
||||
check-am: all-am
|
||||
check: check-am
|
||||
all-am: Makefile $(LIBRARIES) all-local
|
||||
installdirs:
|
||||
install: install-am
|
||||
install-exec: install-exec-am
|
||||
install-data: install-data-am
|
||||
uninstall: uninstall-am
|
||||
|
||||
install-am: all-am
|
||||
@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
|
||||
|
||||
installcheck: installcheck-am
|
||||
install-strip:
|
||||
$(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
|
||||
install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
|
||||
`test -z '$(STRIP)' || \
|
||||
echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
|
||||
mostlyclean-generic:
|
||||
|
||||
clean-generic:
|
||||
|
||||
distclean-generic:
|
||||
-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
|
||||
|
||||
maintainer-clean-generic:
|
||||
@echo "This command is intended for maintainers to use"
|
||||
@echo "it deletes files that may require special tools to rebuild."
|
||||
clean: clean-am
|
||||
|
||||
clean-am: clean-generic clean-noinstLIBRARIES mostlyclean-am
|
||||
|
||||
distclean: distclean-am
|
||||
-rm -rf ./$(DEPDIR)
|
||||
-rm -f Makefile
|
||||
distclean-am: clean-am distclean-compile distclean-generic \
|
||||
distclean-tags
|
||||
|
||||
dvi: dvi-am
|
||||
|
||||
dvi-am:
|
||||
|
||||
html: html-am
|
||||
|
||||
info: info-am
|
||||
|
||||
info-am:
|
||||
|
||||
install-data-am:
|
||||
|
||||
install-exec-am:
|
||||
|
||||
install-info: install-info-am
|
||||
|
||||
install-man:
|
||||
|
||||
installcheck-am:
|
||||
|
||||
maintainer-clean: maintainer-clean-am
|
||||
-rm -rf ./$(DEPDIR)
|
||||
-rm -f Makefile
|
||||
maintainer-clean-am: distclean-am maintainer-clean-generic
|
||||
|
||||
mostlyclean: mostlyclean-am
|
||||
|
||||
mostlyclean-am: mostlyclean-compile mostlyclean-generic
|
||||
|
||||
pdf: pdf-am
|
||||
|
||||
pdf-am:
|
||||
|
||||
ps: ps-am
|
||||
|
||||
ps-am:
|
||||
|
||||
uninstall-am: uninstall-info-am
|
||||
|
||||
.PHONY: CTAGS GTAGS all all-am all-local check check-am clean \
|
||||
clean-generic clean-noinstLIBRARIES ctags distclean \
|
||||
distclean-compile distclean-generic distclean-tags distdir dvi \
|
||||
dvi-am html html-am info info-am install install-am \
|
||||
install-data install-data-am install-exec install-exec-am \
|
||||
install-info install-info-am install-man install-strip \
|
||||
installcheck installcheck-am installdirs maintainer-clean \
|
||||
maintainer-clean-generic mostlyclean mostlyclean-compile \
|
||||
mostlyclean-generic pdf pdf-am ps ps-am tags uninstall \
|
||||
uninstall-am uninstall-info-am
|
||||
|
||||
|
||||
all-local: $(PREINSTALL_FILES)
|
||||
|
||||
preinstall-am: $(PREINSTALL_FILES)
|
||||
preinstall: preinstall-am
|
||||
.PHONY: preinstall preinstall-am
|
||||
|
||||
depend:
|
||||
.PHONY: depend
|
||||
# Tell versions [3.59,3.63) of GNU make to not export all variables.
|
||||
# Otherwise a system limit (for SysV at least) may be exceeded.
|
||||
.NOEXPORT:
|
||||
594
cpukit/libi2c/libi2c.c
Normal file
594
cpukit/libi2c/libi2c.c
Normal file
@@ -0,0 +1,594 @@
|
||||
/* $Id$ */
|
||||
|
||||
/* libi2c Implementation */
|
||||
|
||||
#include <string.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <errno.h>
|
||||
#include <assert.h>
|
||||
|
||||
#include <rtems.h>
|
||||
#include <rtems/error.h>
|
||||
#include <rtems/libio.h>
|
||||
|
||||
#include <rtems/libi2c.h>
|
||||
|
||||
#define DRVNM "libi2c:"
|
||||
|
||||
#define MAX_NO_BUSSES 8 /* Also limited by the macro building minor numbers */
|
||||
#define MAX_NO_DRIVERS 16 /* Number of high level drivers we support */
|
||||
|
||||
#define MINOR2ADDR(minor) ((minor)&((1<<10)-1))
|
||||
#define MINOR2BUS(minor) (((minor)>>10)&7)
|
||||
#define MINOR2DRV(minor) ((minor)>>13)
|
||||
|
||||
/* Check the 'minor' argument, i.e., verify that
|
||||
* we have a driver connected
|
||||
*/
|
||||
#define DECL_CHECKED_BH(b, bh, m, s)\
|
||||
unsigned b = MINOR2BUS(m); \
|
||||
rtems_libi2c_bus_t *bh; \
|
||||
if ( b >= MAX_NO_BUSSES || 0 == (bh=busses[b].bush) ) { \
|
||||
return s RTEMS_INVALID_NUMBER; \
|
||||
}
|
||||
|
||||
#define DECL_CHECKED_DRV(d, b, m) \
|
||||
unsigned d = MINOR2DRV(m); \
|
||||
unsigned b = MINOR2BUS(m); \
|
||||
if ( b >= MAX_NO_BUSSES || 0 == busses[b].bush \
|
||||
|| d > MAX_NO_DRIVERS || (d && 0 == drvs[d-1].drv )) {\
|
||||
return RTEMS_INVALID_NUMBER; \
|
||||
}
|
||||
|
||||
#define DISPATCH(rval, entry, dflt) \
|
||||
do { \
|
||||
rtems_driver_address_table *ops = drvs[--drv].drv->ops; \
|
||||
rval = ops->entry ? ops->entry(major,minor,arg) : dflt; \
|
||||
} while (0)
|
||||
|
||||
|
||||
rtems_device_major_number rtems_libi2c_major;
|
||||
|
||||
static struct i2cbus
|
||||
{
|
||||
rtems_libi2c_bus_t *bush;
|
||||
volatile rtems_id mutex; /* lock this across start -> stop */
|
||||
volatile short waiting;
|
||||
volatile char started;
|
||||
char *name;
|
||||
} busses[MAX_NO_BUSSES] = { { 0 } };
|
||||
|
||||
static struct
|
||||
{
|
||||
rtems_libi2c_drv_t *drv;
|
||||
} drvs[MAX_NO_DRIVERS] = { { 0} };
|
||||
|
||||
static rtems_id libmutex = 0;
|
||||
|
||||
#define LOCK(m) assert(!rtems_semaphore_obtain((m), RTEMS_WAIT, RTEMS_NO_TIMEOUT))
|
||||
#define UNLOCK(m) rtems_semaphore_release((m))
|
||||
|
||||
#define LIBLOCK() LOCK(libmutex)
|
||||
#define LIBUNLOCK() UNLOCK(libmutex)
|
||||
|
||||
#define MUTEX_ATTS \
|
||||
( RTEMS_PRIORITY \
|
||||
| RTEMS_BINARY_SEMAPHORE \
|
||||
|RTEMS_INHERIT_PRIORITY \
|
||||
|RTEMS_NO_PRIORITY_CEILING \
|
||||
|RTEMS_LOCAL )
|
||||
|
||||
static rtems_id
|
||||
mutexCreate (rtems_name nm)
|
||||
{
|
||||
rtems_status_code sc;
|
||||
rtems_id rval;
|
||||
if (RTEMS_SUCCESSFUL !=
|
||||
(sc = rtems_semaphore_create (nm, 1, MUTEX_ATTS, 0, &rval))) {
|
||||
rtems_error (sc, DRVNM " unable to create mutex\n");
|
||||
return 0;
|
||||
}
|
||||
return rval;
|
||||
}
|
||||
|
||||
/* Lock a bus avoiding to have a mutex, which is mostly
|
||||
* unused, hanging around all the time. We just create
|
||||
* and delete it on the fly...
|
||||
*
|
||||
* ASSUMES: argument checked by caller
|
||||
*/
|
||||
|
||||
static void
|
||||
lock_bus (int busno)
|
||||
{
|
||||
struct i2cbus *bus = &busses[busno];
|
||||
LIBLOCK ();
|
||||
if (!bus->waiting) {
|
||||
/* nobody is holding the bus mutex - it's not there. Create it on the fly */
|
||||
if (!
|
||||
(bus->mutex =
|
||||
mutexCreate (rtems_build_name ('i', '2', 'c', '0' + busno)))) {
|
||||
LIBUNLOCK ();
|
||||
rtems_panic (DRVNM " unable to create bus lock");
|
||||
}
|
||||
}
|
||||
/* count number of people waiting on this bus; only the last one deletes the mutex */
|
||||
bus->waiting++;
|
||||
LIBUNLOCK ();
|
||||
/* Now lock this bus */
|
||||
LOCK (bus->mutex);
|
||||
}
|
||||
|
||||
static void
|
||||
unlock_bus (int busno)
|
||||
{
|
||||
struct i2cbus *bus = &busses[busno];
|
||||
LIBLOCK ();
|
||||
UNLOCK (bus->mutex);
|
||||
if (!--bus->waiting) {
|
||||
rtems_semaphore_delete (bus->mutex);
|
||||
}
|
||||
LIBUNLOCK ();
|
||||
}
|
||||
|
||||
/* Note that 'arg' is always passed in as NULL */
|
||||
static rtems_status_code
|
||||
i2c_init (rtems_device_major_number major, rtems_device_minor_number minor,
|
||||
void *arg)
|
||||
{
|
||||
rtems_status_code rval;
|
||||
DECL_CHECKED_DRV (drv, busno, minor)
|
||||
|
||||
if (0 == drv) {
|
||||
rval = 0;
|
||||
} else {
|
||||
/* this is probably never called */
|
||||
DISPATCH (rval, initialization_entry, RTEMS_SUCCESSFUL);
|
||||
}
|
||||
return rval;
|
||||
}
|
||||
|
||||
static rtems_status_code
|
||||
i2c_open (rtems_device_major_number major, rtems_device_minor_number minor,
|
||||
void *arg)
|
||||
{
|
||||
rtems_status_code rval;
|
||||
DECL_CHECKED_DRV (drv, busno, minor)
|
||||
|
||||
if (0 == drv) {
|
||||
rval = RTEMS_SUCCESSFUL;
|
||||
} else {
|
||||
DISPATCH (rval, open_entry, RTEMS_SUCCESSFUL);
|
||||
}
|
||||
return rval;
|
||||
}
|
||||
|
||||
static rtems_status_code
|
||||
i2c_close (rtems_device_major_number major, rtems_device_minor_number minor,
|
||||
void *arg)
|
||||
{
|
||||
rtems_status_code rval;
|
||||
DECL_CHECKED_DRV (drv, busno, minor)
|
||||
|
||||
if (0 == drv) {
|
||||
rval = RTEMS_SUCCESSFUL;
|
||||
} else {
|
||||
DISPATCH (rval, close_entry, RTEMS_SUCCESSFUL);
|
||||
}
|
||||
return rval;
|
||||
}
|
||||
|
||||
static rtems_status_code
|
||||
i2c_read (rtems_device_major_number major, rtems_device_minor_number minor,
|
||||
void *arg)
|
||||
{
|
||||
int rval; /* int so we can check for negative value */
|
||||
rtems_libio_rw_args_t *rwargs = arg;
|
||||
DECL_CHECKED_DRV (drv, busno, minor)
|
||||
|
||||
if (0 == rwargs->count) {
|
||||
rwargs->bytes_moved = 0;
|
||||
return RTEMS_SUCCESSFUL;
|
||||
}
|
||||
|
||||
if (0 == drv) {
|
||||
rval =
|
||||
rtems_libi2c_start_read_bytes (minor, (unsigned char *) rwargs->buffer,
|
||||
rwargs->count);
|
||||
if (rval >= 0) {
|
||||
rwargs->bytes_moved = rval;
|
||||
rtems_libi2c_send_stop (minor);
|
||||
rval = RTEMS_SUCCESSFUL;
|
||||
} else {
|
||||
rval = -rval;
|
||||
}
|
||||
} else {
|
||||
DISPATCH (rval, read_entry, RTEMS_NOT_IMPLEMENTED);
|
||||
}
|
||||
return rval;
|
||||
}
|
||||
|
||||
static rtems_status_code
|
||||
i2c_write (rtems_device_major_number major, rtems_device_minor_number minor,
|
||||
void *arg)
|
||||
{
|
||||
int rval; /* int so we can check for negative value */
|
||||
rtems_libio_rw_args_t *rwargs = arg;
|
||||
DECL_CHECKED_DRV (drv, busno, minor)
|
||||
|
||||
if (0 == rwargs->count) {
|
||||
rwargs->bytes_moved = 0;
|
||||
return RTEMS_SUCCESSFUL;
|
||||
}
|
||||
|
||||
if (0 == drv) {
|
||||
rval =
|
||||
rtems_libi2c_start_write_bytes (minor, (unsigned char *) rwargs->buffer,
|
||||
rwargs->count);
|
||||
if (rval >= 0) {
|
||||
rwargs->bytes_moved = rval;
|
||||
rtems_libi2c_send_stop (minor);
|
||||
rval = RTEMS_SUCCESSFUL;
|
||||
} else {
|
||||
rval = -rval;
|
||||
}
|
||||
} else {
|
||||
DISPATCH (rval, write_entry, RTEMS_NOT_IMPLEMENTED);
|
||||
}
|
||||
return rval;
|
||||
}
|
||||
|
||||
static rtems_status_code
|
||||
i2c_ioctl (rtems_device_major_number major, rtems_device_minor_number minor,
|
||||
void *arg)
|
||||
{
|
||||
rtems_status_code rval;
|
||||
DECL_CHECKED_DRV (drv, busno, minor)
|
||||
|
||||
if (0 == drv) {
|
||||
rval = RTEMS_NOT_IMPLEMENTED;
|
||||
} else {
|
||||
DISPATCH (rval, control_entry, RTEMS_NOT_IMPLEMENTED);
|
||||
}
|
||||
return rval;
|
||||
}
|
||||
|
||||
|
||||
/* Our ops just dispatch to the registered drivers */
|
||||
static rtems_driver_address_table libi2c_io_ops = {
|
||||
initialization_entry: i2c_init,
|
||||
open_entry: i2c_open,
|
||||
close_entry: i2c_close,
|
||||
read_entry: i2c_read,
|
||||
write_entry: i2c_write,
|
||||
control_entry: i2c_ioctl,
|
||||
};
|
||||
|
||||
|
||||
int
|
||||
rtems_libi2c_initialize ()
|
||||
{
|
||||
rtems_status_code sc;
|
||||
|
||||
if (!(libmutex = mutexCreate (rtems_build_name ('l', 'I', '2', 'C'))))
|
||||
return -1;
|
||||
|
||||
sc = rtems_io_register_driver (0, &libi2c_io_ops, &rtems_libi2c_major);
|
||||
if (RTEMS_SUCCESSFUL != 0) {
|
||||
fprintf (stderr,
|
||||
DRVNM " Claiming driver slot failed (rtems status code %i)\n",
|
||||
sc);
|
||||
rtems_semaphore_delete (libmutex);
|
||||
libmutex = 0;
|
||||
return -1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
rtems_libi2c_register_bus (char *name, rtems_libi2c_bus_t * bus)
|
||||
{
|
||||
int i;
|
||||
rtems_status_code err;
|
||||
char *nmcpy = malloc (name ? strlen (name) + 1 : 20);
|
||||
char tmp, *chpt;
|
||||
struct stat sbuf;
|
||||
|
||||
strcpy (nmcpy, name ? name : "/dev/i2c");
|
||||
|
||||
|
||||
/* check */
|
||||
if ('/' != *nmcpy) {
|
||||
fprintf (stderr,
|
||||
"Bad name; must be an absolute path starting with '/'\n");
|
||||
return -RTEMS_INVALID_NAME;
|
||||
}
|
||||
/* file must not exist */
|
||||
if (!stat (nmcpy, &sbuf)) {
|
||||
fprintf (stderr, "Bad name; file exists already\n");
|
||||
return -RTEMS_INVALID_NAME;
|
||||
}
|
||||
|
||||
/* we already verified that there is at least one '/' */
|
||||
chpt = strrchr (nmcpy, '/') + 1;
|
||||
tmp = *chpt;
|
||||
*chpt = 0;
|
||||
i = stat (nmcpy, &sbuf);
|
||||
*chpt = tmp;
|
||||
if (i) {
|
||||
fprintf (stderr, "Bad name '%s'; parent directory doesn't exist\n",
|
||||
nmcpy);
|
||||
return -RTEMS_INVALID_NAME;
|
||||
}
|
||||
/* should be a directory since name terminates in '/' */
|
||||
|
||||
|
||||
if (!libmutex) {
|
||||
fprintf (stderr, DRVNM " library not initialized\n");
|
||||
return -RTEMS_NOT_DEFINED;
|
||||
}
|
||||
|
||||
if (bus->size < sizeof (*bus)) {
|
||||
fprintf (stderr, DRVNM " bus-ops size too small -- misconfiguration?\n");
|
||||
return -RTEMS_NOT_CONFIGURED;
|
||||
}
|
||||
|
||||
LIBLOCK ();
|
||||
for (i = 0; i < MAX_NO_BUSSES; i++) {
|
||||
if (!busses[i].bush) {
|
||||
/* found a free slot */
|
||||
busses[i].bush = bus;
|
||||
busses[i].mutex = 0;
|
||||
busses[i].waiting = 0;
|
||||
busses[i].started = 0;
|
||||
|
||||
if (!name)
|
||||
sprintf (nmcpy + strlen (nmcpy), "%i", i);
|
||||
|
||||
if ((err = busses[i].bush->ops->init (busses[i].bush))) {
|
||||
/* initialization failed */
|
||||
i = -err;
|
||||
} else {
|
||||
busses[i].name = nmcpy;;
|
||||
nmcpy = 0;
|
||||
}
|
||||
|
||||
break;
|
||||
}
|
||||
}
|
||||
LIBUNLOCK ();
|
||||
|
||||
if (i >= MAX_NO_BUSSES) {
|
||||
i = -RTEMS_TOO_MANY;
|
||||
}
|
||||
|
||||
free (nmcpy);
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
static int
|
||||
not_started (int busno)
|
||||
{
|
||||
int rval;
|
||||
lock_bus (busno);
|
||||
rval = !busses[busno].started;
|
||||
unlock_bus (busno);
|
||||
return rval;
|
||||
}
|
||||
|
||||
rtems_status_code
|
||||
rtems_libi2c_send_start (unsigned32 minor)
|
||||
{
|
||||
int rval;
|
||||
DECL_CHECKED_BH (busno, bush, minor, +)
|
||||
|
||||
lock_bus (busno);
|
||||
rval = bush->ops->send_start (bush);
|
||||
|
||||
/* if this failed or is not the first start, unlock */
|
||||
if (rval || busses[busno].started) {
|
||||
/* HMM - what to do if the 1st start failed ?
|
||||
* try to reset...
|
||||
*/
|
||||
if (!busses[busno].started) {
|
||||
/* just in case the bus driver fiddles with errno */
|
||||
int errno_saved = errno;
|
||||
bush->ops->init (bush);
|
||||
errno = errno_saved;
|
||||
} else if (rval) {
|
||||
/* failed restart */
|
||||
rtems_libi2c_send_stop (minor);
|
||||
}
|
||||
unlock_bus (busno);
|
||||
} else {
|
||||
/* successful 1st start; keep bus locked until stop is sent */
|
||||
busses[busno].started = 1;
|
||||
}
|
||||
return rval;
|
||||
}
|
||||
|
||||
rtems_status_code
|
||||
rtems_libi2c_send_stop (unsigned32 minor)
|
||||
{
|
||||
rtems_status_code rval;
|
||||
DECL_CHECKED_BH (busno, bush, minor, +)
|
||||
|
||||
if (not_started (busno))
|
||||
return RTEMS_NOT_OWNER_OF_RESOURCE;
|
||||
|
||||
rval = bush->ops->send_stop (bush);
|
||||
|
||||
busses[busno].started = 0;
|
||||
|
||||
unlock_bus (busno);
|
||||
return rval;
|
||||
}
|
||||
|
||||
rtems_status_code
|
||||
rtems_libi2c_send_addr (unsigned32 minor, int rw)
|
||||
{
|
||||
rtems_status_code sc;
|
||||
DECL_CHECKED_BH (busno, bush, minor, +)
|
||||
|
||||
if (not_started (busno))
|
||||
return RTEMS_NOT_OWNER_OF_RESOURCE;
|
||||
|
||||
sc = bush->ops->send_addr (bush, MINOR2ADDR (minor), rw);
|
||||
if (RTEMS_SUCCESSFUL != sc)
|
||||
rtems_libi2c_send_stop (minor);
|
||||
return sc;
|
||||
}
|
||||
|
||||
int
|
||||
rtems_libi2c_read_bytes (unsigned32 minor, unsigned char *bytes, int nbytes)
|
||||
{
|
||||
int sc;
|
||||
DECL_CHECKED_BH (busno, bush, minor, -)
|
||||
|
||||
if (not_started (busno))
|
||||
return -RTEMS_NOT_OWNER_OF_RESOURCE;
|
||||
|
||||
sc = bush->ops->read_bytes (bush, bytes, nbytes);
|
||||
if (sc < 0)
|
||||
rtems_libi2c_send_stop (minor);
|
||||
return sc;
|
||||
}
|
||||
|
||||
int
|
||||
rtems_libi2c_write_bytes (unsigned32 minor, unsigned char *bytes, int nbytes)
|
||||
{
|
||||
int sc;
|
||||
DECL_CHECKED_BH (busno, bush, minor, -)
|
||||
|
||||
if (not_started (busno))
|
||||
return -RTEMS_NOT_OWNER_OF_RESOURCE;
|
||||
|
||||
sc = bush->ops->write_bytes (bush, bytes, nbytes);
|
||||
if (sc < 0)
|
||||
rtems_libi2c_send_stop (minor);
|
||||
return sc;
|
||||
}
|
||||
|
||||
static int
|
||||
do_s_rw (unsigned32 minor, unsigned char *bytes, int nbytes, int rw)
|
||||
{
|
||||
rtems_status_code sc;
|
||||
rtems_libi2c_bus_t *bush;
|
||||
|
||||
if ((sc = rtems_libi2c_send_start (minor)))
|
||||
return -sc;
|
||||
|
||||
/* at this point, we hold the bus and are sure the minor number is valid */
|
||||
bush = busses[MINOR2BUS (minor)].bush;
|
||||
|
||||
if ((sc = bush->ops->send_addr (bush, MINOR2ADDR (minor), rw))) {
|
||||
rtems_libi2c_send_stop (minor);
|
||||
return -sc;
|
||||
}
|
||||
|
||||
if (rw)
|
||||
sc = bush->ops->read_bytes (bush, bytes, nbytes);
|
||||
else
|
||||
sc = bush->ops->write_bytes (bush, bytes, nbytes);
|
||||
|
||||
if (sc < 0) {
|
||||
rtems_libi2c_send_stop (minor);
|
||||
}
|
||||
return sc;
|
||||
}
|
||||
|
||||
int
|
||||
rtems_libi2c_start_read_bytes (unsigned32 minor, unsigned char *bytes,
|
||||
int nbytes)
|
||||
{
|
||||
return do_s_rw (minor, bytes, nbytes, 1);
|
||||
}
|
||||
|
||||
int
|
||||
rtems_libi2c_start_write_bytes (unsigned32 minor, unsigned char *bytes,
|
||||
int nbytes)
|
||||
{
|
||||
return do_s_rw (minor, bytes, nbytes, 0);
|
||||
}
|
||||
|
||||
int
|
||||
rtems_libi2c_register_drv (char *name, rtems_libi2c_drv_t * drvtbl,
|
||||
unsigned busno, unsigned i2caddr)
|
||||
{
|
||||
int i;
|
||||
rtems_status_code err;
|
||||
rtems_device_minor_number minor;
|
||||
|
||||
if (!libmutex) {
|
||||
fprintf (stderr, DRVNM " library not initialized\n");
|
||||
return -RTEMS_NOT_DEFINED;
|
||||
}
|
||||
|
||||
if (name && strchr (name, '/')) {
|
||||
fprintf (stderr, "Invalid name: '%s' -- must not contain '/'\n", name);
|
||||
return -RTEMS_INVALID_NAME;
|
||||
}
|
||||
|
||||
if (busno >= MAX_NO_BUSSES || !busses[busno].bush || i2caddr >= 1 << 10) {
|
||||
errno = EINVAL;
|
||||
return -RTEMS_INVALID_NUMBER;
|
||||
}
|
||||
|
||||
if (drvtbl->size < sizeof (*drvtbl)) {
|
||||
fprintf (stderr, DRVNM " drv-ops size too small -- misconfiguration?\n");
|
||||
return -RTEMS_NOT_CONFIGURED;
|
||||
}
|
||||
|
||||
/* allocate slot */
|
||||
LIBLOCK ();
|
||||
for (i = 0; i < MAX_NO_DRIVERS; i++) {
|
||||
/* driver # 0 is special, it is the built-in raw driver */
|
||||
if (!drvs[i].drv) {
|
||||
char *str;
|
||||
dev_t dev;
|
||||
unsigned32 mode;
|
||||
|
||||
/* found a free slot; encode slot + 1 ! */
|
||||
minor = ((i + 1) << 13) | RTEMS_LIBI2C_MAKE_MINOR (busno, i2caddr);
|
||||
|
||||
if (name) {
|
||||
str = malloc (strlen (busses[busno].name) + strlen (name) + 2);
|
||||
sprintf (str, "%s.%s", busses[busno].name, name);
|
||||
|
||||
dev = rtems_filesystem_make_dev_t (rtems_libi2c_major, minor);
|
||||
|
||||
mode = 0111 | S_IFCHR;
|
||||
if (drvtbl->ops->read_entry)
|
||||
mode |= 0444;
|
||||
if (drvtbl->ops->write_entry)
|
||||
mode |= 0222;
|
||||
|
||||
/* note that 'umask' is applied to 'mode' */
|
||||
if (mknod (str, mode, dev)) {
|
||||
fprintf (stderr,
|
||||
"Creating device node failed: %s; you can try to do it manually...\n",
|
||||
strerror (errno));
|
||||
}
|
||||
|
||||
free (str);
|
||||
}
|
||||
|
||||
drvs[i].drv = drvtbl;
|
||||
|
||||
if (drvtbl->ops->initialization_entry)
|
||||
err =
|
||||
drvs[i].drv->ops->initialization_entry (rtems_libi2c_major, minor,
|
||||
0);
|
||||
else
|
||||
err = RTEMS_SUCCESSFUL;
|
||||
|
||||
LIBUNLOCK ();
|
||||
return err ? -err : minor;
|
||||
}
|
||||
}
|
||||
LIBUNLOCK ();
|
||||
return -RTEMS_TOO_MANY;
|
||||
}
|
||||
234
cpukit/libi2c/libi2c.h
Normal file
234
cpukit/libi2c/libi2c.h
Normal file
@@ -0,0 +1,234 @@
|
||||
#ifndef RTEMS_LIBI2C_H
|
||||
#define RTEMS_LIBI2C_H
|
||||
/*$Id$*/
|
||||
#include <rtems.h>
|
||||
|
||||
#include <rtems/io.h>
|
||||
|
||||
#ifdef __cplusplus
|
||||
extern "C" {
|
||||
#endif
|
||||
|
||||
/* Simple I2C driver API */
|
||||
|
||||
/* Initialize the libary - may fail if no semaphore or no driver slot is available */
|
||||
int rtems_libi2c_initialize ();
|
||||
|
||||
/* Bus Driver API
|
||||
*
|
||||
* Bus drivers provide access to low-level i2c functions
|
||||
* such as 'send start', 'send address', 'get bytes' etc.
|
||||
*/
|
||||
|
||||
/* first field must be a pointer to ops; driver
|
||||
* may add its own fields after this.
|
||||
* the struct that is registered with the library
|
||||
* is not copied; a pointer will we passed
|
||||
* to the callback functions (ops).
|
||||
*/
|
||||
typedef struct rtems_libi2c_bus_t_
|
||||
{
|
||||
struct rtems_libi2c_bus_ops_ *ops;
|
||||
int size; /* size of whole structure */
|
||||
} rtems_libi2c_bus_t;
|
||||
|
||||
/* Access functions a low level driver must provide;
|
||||
*
|
||||
* All of these, except read_bytes and write_bytes
|
||||
* return RTEMS_SUCCESSFUL on success and an error status
|
||||
* otherwise. The read and write ops return the number
|
||||
* of chars read/written or -(status code) on error.
|
||||
*/
|
||||
typedef struct rtems_libi2c_bus_ops_
|
||||
{
|
||||
/* Initialize the bus; might be called again to reset the bus driver */
|
||||
rtems_status_code (*init) (rtems_libi2c_bus_t * bushdl);
|
||||
/* Send start condition */
|
||||
rtems_status_code (*send_start) (rtems_libi2c_bus_t * bushdl);
|
||||
/* Send stop condition */
|
||||
rtems_status_code (*send_stop) (rtems_libi2c_bus_t * bushdl);
|
||||
/* initiate transfer from (rw!=0) or to a device */
|
||||
rtems_status_code (*send_addr) (rtems_libi2c_bus_t * bushdl,
|
||||
unsigned32 addr, int rw);
|
||||
/* read a number of bytes */
|
||||
int (*read_bytes) (rtems_libi2c_bus_t * bushdl, unsigned char *bytes,
|
||||
int nbytes);
|
||||
/* write a number of bytes */
|
||||
int (*write_bytes) (rtems_libi2c_bus_t * bushdl, unsigned char *bytes,
|
||||
int nbytes);
|
||||
} rtems_libi2c_bus_ops_t;
|
||||
|
||||
|
||||
/*
|
||||
* Register a lowlevel driver
|
||||
*
|
||||
* TODO: better description
|
||||
*
|
||||
* This allocates a major number identifying *this* driver
|
||||
* (i.e., libi2c) and the minor number encodes a bus# and a i2c address.
|
||||
*
|
||||
* The name will be registered in the filesystem (parent
|
||||
* directories must exist). It may be NULL in which case
|
||||
* the library will pick a default.
|
||||
*
|
||||
* RETURNS: bus # (>=0) or -1 on error (errno set).
|
||||
*/
|
||||
|
||||
int rtems_libi2c_register_bus (char *name, rtems_libi2c_bus_t * bus);
|
||||
|
||||
extern rtems_device_major_number rtems_libi2c_major;
|
||||
|
||||
#define RTEMS_LIBI2C_MAKE_MINOR(busno, i2caddr) \
|
||||
((((busno)&((1<<3)-1))<<10) | ((i2caddr)&((1<<10)-1)))
|
||||
|
||||
/* After the library is initialized, a major number is available.
|
||||
* As soon as a low-level bus driver is registered (above routine
|
||||
* returns a 'busno'), a device node can be created in the filesystem
|
||||
* with a major/minor number pair of
|
||||
*
|
||||
* rtems_libi2c_major / RTEMS_LIBI2C_MAKE_MINOR(busno, i2caddr)
|
||||
*
|
||||
* and a 'raw' hi-level driver is then attached to this device
|
||||
* node.
|
||||
* This 'raw' driver has very simple semantics:
|
||||
*
|
||||
* 'open' sends a start condition
|
||||
* 'read'/'write' address the device identified by the i2c bus# and address
|
||||
* encoded in the minor number and read or write, respectively
|
||||
* a stream of bytes from or to the device. Every time the
|
||||
* direction is changed, a 're-start' condition followed by
|
||||
* an 'address' cycle is generated on the i2c bus.
|
||||
* 'close' sends a stop condition.
|
||||
*
|
||||
* Hence, using the 'raw' driver, e.g., 100 bytes at offset 0x200 can be
|
||||
* read from an EEPROM by the following pseudo-code:
|
||||
*
|
||||
* mknod("/dev/i2c-54", mode, MKDEV(rtems_libi2c_major, RTEMS_LIBI2C_MAKE_MINOR(0,0x54)))
|
||||
*
|
||||
* int fd;
|
||||
* char off[2]={0x02,0x00};
|
||||
*
|
||||
* fd = open("/dev/i2c-54",O_RDWR);
|
||||
* write(fd,off,2);
|
||||
* read(fd,buf,100);
|
||||
* close(fd);
|
||||
*
|
||||
*/
|
||||
|
||||
/* Higher Level Driver API
|
||||
*
|
||||
* Higher level drivers know how to deal with specific i2c
|
||||
* devices (independent of the bus interface chip) and provide
|
||||
* an abstraction, i.e., the usual read/write/ioctl access.
|
||||
*
|
||||
* Using the above example, such a high level driver could
|
||||
* prevent the user from issuing potentially destructive write
|
||||
* operations (the aforementioned EEPROM interprets any 3rd
|
||||
* and following byte written to the device as data, i.e., the
|
||||
* contents could easily be changed!).
|
||||
* The correct 'read-pointer offset' programming could be
|
||||
* implemented in 'open' and 'ioctl' of a high-level driver and
|
||||
* the user would then only have to perform harmless read
|
||||
* operations, e.g.,
|
||||
*
|
||||
* fd = open("/dev/i2c.eeprom",O_RDONLY) / * opens and sets EEPROM read pointer * /
|
||||
* ioctl(fd, IOCTL_SEEK, 0x200) / * repositions the read pointer * /
|
||||
* read(fd, buf, 100)
|
||||
* close(fd)
|
||||
*
|
||||
*/
|
||||
|
||||
/* struct provided at driver registration. The driver may store
|
||||
* private data behind the mandatory first fields but the size
|
||||
* must be set to the size of the entire struct, e.g.,
|
||||
*
|
||||
* struct driver_pvt {
|
||||
* rtems_libi2c_drv_t pub;
|
||||
* struct { ... } pvt;
|
||||
* } my_driver = {
|
||||
* { ops: my_ops,
|
||||
* size: sizeof(my_driver)
|
||||
* },
|
||||
* { ...};
|
||||
* };
|
||||
*
|
||||
* A pointer to this struct is passed to the callback ops.
|
||||
*/
|
||||
|
||||
typedef struct rtems_libi2c_drv_t_
|
||||
{
|
||||
rtems_driver_address_table *ops; /* the driver ops */
|
||||
int size; /* size of whole structure (including appended private data) */
|
||||
} rtems_libi2c_drv_t;
|
||||
|
||||
/*
|
||||
* The high level driver must be registered with a particular
|
||||
* bus number and i2c address.
|
||||
*
|
||||
* The registration procedure also creates a filesystem node,
|
||||
* i.e., the returned minor number is not really needed.
|
||||
*
|
||||
* If the 'name' argument is NULL, no filesystem node is
|
||||
* created (but this can be done 'manually' using rtems_libi2c_major
|
||||
* and the return value of this routine).
|
||||
*
|
||||
* RETURNS minor number (FYI) or -1 on failure
|
||||
*/
|
||||
int
|
||||
rtems_libi2c_register_drv (char *name, rtems_libi2c_drv_t * drvtbl,
|
||||
unsigned bus, unsigned i2caddr);
|
||||
|
||||
/* Operations available to high level drivers */
|
||||
|
||||
/* NOTES: The bus a device is attached to is LOCKED from the first send_start
|
||||
* until send_stop is executed!
|
||||
*
|
||||
* Bus tenure MUST NOT span multiple system calls - otherwise, a single
|
||||
* thread could get into the protected sections (or would deadlock if the
|
||||
* mutex was not nestable).
|
||||
* E.g., consider what happens if 'open' sends a 'start' and 'close'
|
||||
* sends a 'stop' (i.e., the bus mutex would be locked in 'open' and
|
||||
* released in 'close'. A single thread could try to open two devices
|
||||
* on the same bus and would either deadlock or nest into the bus mutex
|
||||
* and potentially mess up the i2c messages.
|
||||
*
|
||||
* The correct way is to *always* relinquish the i2c bus (i.e., send 'stop'
|
||||
* from any driver routine prior to returning control to the caller.
|
||||
* Consult the implementation of the generic driver routines (open, close, ...)
|
||||
* below or the examples in i2c-2b-eeprom.c and i2c-2b-ds1621.c
|
||||
*
|
||||
* Drivers just pass the minor number on to these routines...
|
||||
*/
|
||||
rtems_status_code rtems_libi2c_send_start (rtems_device_minor_number minor);
|
||||
|
||||
rtems_status_code rtems_libi2c_send_stop (rtems_device_minor_number minor);
|
||||
|
||||
rtems_status_code
|
||||
rtems_libi2c_send_addr (rtems_device_minor_number minor, int rw);
|
||||
|
||||
/* the read/write routines return the number of bytes transferred
|
||||
* or -(status_code) on error.
|
||||
*/
|
||||
int
|
||||
rtems_libi2c_read_bytes (rtems_device_minor_number minor,
|
||||
unsigned char *bytes, int nbytes);
|
||||
|
||||
int
|
||||
rtems_libi2c_write_bytes (rtems_device_minor_number minor,
|
||||
unsigned char *bytes, int nbytes);
|
||||
|
||||
/* Send start, send address and read bytes */
|
||||
int
|
||||
rtems_libi2c_start_read_bytes (unsigned32 minor, unsigned char *bytes,
|
||||
int nbytes);
|
||||
|
||||
/* Send start, send address and write bytes */
|
||||
int
|
||||
rtems_libi2c_start_write_bytes (unsigned32 minor, unsigned char *bytes,
|
||||
int nbytes);
|
||||
|
||||
#ifdef __cplusplus
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
@@ -57,6 +57,8 @@ TMP_LIBS += ../libmisc/libmw-fb.a
|
||||
TMP_LIBS += ../libmisc/libcapture.a
|
||||
TMP_LIBS += ../libmisc/libfsmount.a
|
||||
|
||||
TMP_LIBS += ../libi2c/libi2c.a
|
||||
|
||||
if HAS_NETWORKING
|
||||
TMP_LIBS += ../libnetworking/libnetworking.a
|
||||
TMP_LIBS += ../libnetworking/libc.a
|
||||
|
||||
Reference in New Issue
Block a user