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New library for I2C device access under Linux. As a first step, the
New library for I2C device access under Linux. As a first step, the
library will host the i2c_smbus_*() inline functions which were previously in the user-space flavor of <linux/i2c-dev.h>. git-svn-id: http://lm-sensors.org/svn/i2c-tools/trunk@6054 7894878c-1315-0410-8ee3-d5d059ff63e0tags/v4.0
Jean Delvare
13 years ago
8 changed files with 379 additions and 191 deletions
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1CHANGES
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14Makefile
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32README
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191include/i2c/smbus.h
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102lib/Module.mk
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18lib/libi2c.map
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203lib/smbus.c
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9tools/Module.mk
@ -0,0 +1,102 @@ |
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# I2C library for Linux
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#
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# Copyright (C) 2012 Jean Delvare <khali@linux-fr.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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LIB_DIR := lib |
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LIB_CFLAGS := -Wstrict-prototypes -Wshadow -Wpointer-arith -Wcast-qual \
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-Wcast-align -Wwrite-strings -Wnested-externs -Winline \
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-W -Wundef -Wmissing-prototypes -Iinclude |
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# The main and minor version of the library
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# The library soname (major number) must be changed if and only if the
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# interface is changed in a backward incompatible way. The interface is
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# defined by the public header files - in this case they are only smbus.h.
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LIB_MAINVER := 0 |
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LIB_MINORVER := 1.0 |
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LIB_VER := $(LIB_MAINVER).$(LIB_MINORVER) |
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# The shared and static library names
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LIB_SHBASENAME := libi2c.so |
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LIB_SHSONAME := $(LIB_SHBASENAME).$(LIB_MAINVER) |
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LIB_SHLIBNAME := $(LIB_SHBASENAME).$(LIB_VER) |
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LIB_STLIBNAME := libi2c.a |
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LIB_TARGETS := $(LIB_SHLIBNAME) |
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LIB_LINKS := $(LIB_SHSONAME) $(LIB_SHBASENAME) |
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LIB_OBJECTS := smbus.o |
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ifeq ($(BUILD_STATIC_LIB),1) |
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LIB_TARGETS += $(LIB_STLIBNAME) |
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LIB_OBJECTS += smbus.ao |
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endif |
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#
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# Libraries
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#
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$(LIB_DIR)/$(LIB_SHLIBNAME): $(LIB_DIR)/smbus.o |
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$(CC) -shared $(LDFLAGS) -Wl,--version-script=$(LIB_DIR)/libi2c.map -Wl,-soname,$(LIB_SHSONAME) -o $@ $^ -lc |
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$(LIB_DIR)/$(LIB_SHSONAME): |
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$(RM) $@ |
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$(LN) $(LIB_SHLIBNAME) $@ |
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$(LIB_DIR)/$(LIB_SHBASENAME): |
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$(RM) $@ |
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$(LN) $(LIB_SHLIBNAME) $@ |
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$(LIB_DIR)/$(LIB_STLIBNAME): $(LIB_DIR)/smbus.ao |
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$(RM) $@ |
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$(AR) rcvs $@ $^ |
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#
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# Objects
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# Each object must be built twice, once for the shared library and
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# once again for the static library.
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#
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$(LIB_DIR)/smbus.o: $(LIB_DIR)/smbus.c $(INCLUDE_DIR)/i2c/smbus.h |
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$(CC) $(SOCFLAGS) $(LIB_CFLAGS) -c $< -o $@ |
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$(LIB_DIR)/smbus.ao: $(LIB_DIR)/smbus.c $(INCLUDE_DIR)/i2c/smbus.h |
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$(CC) $(CFLAGS) $(LIB_CFLAGS) -c $< -o $@ |
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#
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# Commands
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#
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all-lib: $(addprefix $(LIB_DIR)/,$(LIB_TARGETS) $(LIB_LINKS)) |
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strip-lib: $(addprefix $(LIB_DIR)/,$(LIB_TARGETS)) |
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strip $(addprefix $(LIB_DIR)/,$(LIB_TARGETS)) |
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clean-lib: |
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$(RM) $(addprefix $(LIB_DIR)/,*.o *.ao $(LIB_TARGETS) $(LIB_LINKS)) |
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install-lib: $(addprefix $(LIB_DIR)/,$(LIB_TARGETS)) |
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$(INSTALL_DIR) $(DESTDIR)$(libdir) |
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$(INSTALL_PROGRAM) $(LIB_DIR)/$(LIB_SHLIBNAME) $(DESTDIR)$(libdir) |
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$(LN) $(LIB_SHLIBNAME) $(DESTDIR)$(libdir)/$(LIB_SHSONAME) |
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$(LN) $(LIB_SHSONAME) $(DESTDIR)$(libdir)/$(LIB_SHBASENAME) |
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ifeq ($(BUILD_STATIC_LIB),1) |
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$(INSTALL_DATA) $(LIB_DIR)/$(LIB_STLIBNAME) $(DESTDIR)$(libdir) |
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endif |
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uninstall-lib: |
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for library in $(LIB_TARGETS) $(LIB_LINKS) ; do \
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$(RM) $(DESTDIR)$(libdir)/$$library ; done |
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all: all-lib |
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strip: strip-lib |
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clean: clean-lib |
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install: install-lib |
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uninstall: uninstall-lib |
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@ -0,0 +1,18 @@ |
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{ |
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global: |
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i2c_smbus_access; |
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i2c_smbus_write_quick; |
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i2c_smbus_read_byte; |
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i2c_smbus_write_byte; |
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i2c_smbus_read_byte_data; |
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i2c_smbus_write_byte_data; |
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i2c_smbus_read_word_data; |
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i2c_smbus_write_word_data; |
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i2c_smbus_process_call; |
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i2c_smbus_read_block_data; |
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i2c_smbus_write_block_data; |
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i2c_smbus_read_i2c_block_data; |
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i2c_smbus_write_i2c_block_data; |
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i2c_smbus_block_process_call; |
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local: *; |
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}; |
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@ -0,0 +1,203 @@ |
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/* |
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smbus.c - SMBus level access helper functions |
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Copyright (C) 1995-97 Simon G. Vogl |
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Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl> |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
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MA 02110-1301 USA. |
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*/ |
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#include <i2c/smbus.h> |
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#include <sys/ioctl.h> |
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#include <linux/types.h> |
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#include <linux/i2c.h> |
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#include <linux/i2c-dev.h> |
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/* Compatibility defines */ |
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#ifndef I2C_SMBUS_I2C_BLOCK_BROKEN |
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#define I2C_SMBUS_I2C_BLOCK_BROKEN I2C_SMBUS_I2C_BLOCK_DATA |
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#endif |
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#ifndef I2C_FUNC_SMBUS_PEC |
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#define I2C_FUNC_SMBUS_PEC I2C_FUNC_SMBUS_HWPEC_CALC |
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#endif |
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__s32 i2c_smbus_access(int file, char read_write, __u8 command, |
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int size, union i2c_smbus_data *data) |
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{ |
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struct i2c_smbus_ioctl_data args; |
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args.read_write = read_write; |
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args.command = command; |
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args.size = size; |
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args.data = data; |
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return ioctl(file, I2C_SMBUS, &args); |
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} |
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__s32 i2c_smbus_write_quick(int file, __u8 value) |
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{ |
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return i2c_smbus_access(file, value, 0, I2C_SMBUS_QUICK, NULL); |
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} |
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__s32 i2c_smbus_read_byte(int file) |
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{ |
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union i2c_smbus_data data; |
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if (i2c_smbus_access(file, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &data)) |
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return -1; |
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else |
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return 0x0FF & data.byte; |
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} |
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__s32 i2c_smbus_write_byte(int file, __u8 value) |
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{ |
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return i2c_smbus_access(file, I2C_SMBUS_WRITE, value, |
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I2C_SMBUS_BYTE, NULL); |
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} |
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__s32 i2c_smbus_read_byte_data(int file, __u8 command) |
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{ |
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union i2c_smbus_data data; |
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if (i2c_smbus_access(file, I2C_SMBUS_READ, command, |
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I2C_SMBUS_BYTE_DATA, &data)) |
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return -1; |
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else |
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return 0x0FF & data.byte; |
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} |
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__s32 i2c_smbus_write_byte_data(int file, __u8 command, __u8 value) |
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{ |
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union i2c_smbus_data data; |
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data.byte = value; |
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return i2c_smbus_access(file, I2C_SMBUS_WRITE, command, |
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I2C_SMBUS_BYTE_DATA, &data); |
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} |
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__s32 i2c_smbus_read_word_data(int file, __u8 command) |
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{ |
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union i2c_smbus_data data; |
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if (i2c_smbus_access(file, I2C_SMBUS_READ, command, |
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I2C_SMBUS_WORD_DATA, &data)) |
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return -1; |
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else |
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return 0x0FFFF & data.word; |
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} |
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__s32 i2c_smbus_write_word_data(int file, __u8 command, __u16 value) |
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{ |
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union i2c_smbus_data data; |
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data.word = value; |
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return i2c_smbus_access(file, I2C_SMBUS_WRITE, command, |
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I2C_SMBUS_WORD_DATA, &data); |
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} |
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__s32 i2c_smbus_process_call(int file, __u8 command, __u16 value) |
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{ |
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union i2c_smbus_data data; |
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data.word = value; |
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if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command, |
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I2C_SMBUS_PROC_CALL, &data)) |
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return -1; |
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else |
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return 0x0FFFF & data.word; |
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} |
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/* Returns the number of read bytes */ |
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__s32 i2c_smbus_read_block_data(int file, __u8 command, __u8 *values) |
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{ |
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union i2c_smbus_data data; |
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int i; |
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if (i2c_smbus_access(file, I2C_SMBUS_READ, command, |
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I2C_SMBUS_BLOCK_DATA, &data)) |
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return -1; |
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else { |
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for (i = 1; i <= data.block[0]; i++) |
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values[i-1] = data.block[i]; |
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return data.block[0]; |
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} |
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} |
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__s32 i2c_smbus_write_block_data(int file, __u8 command, __u8 length, |
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const __u8 *values) |
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{ |
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union i2c_smbus_data data; |
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int i; |
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if (length > 32) |
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length = 32; |
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for (i = 1; i <= length; i++) |
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data.block[i] = values[i-1]; |
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data.block[0] = length; |
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return i2c_smbus_access(file, I2C_SMBUS_WRITE, command, |
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I2C_SMBUS_BLOCK_DATA, &data); |
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} |
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/* Returns the number of read bytes */ |
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/* Until kernel 2.6.22, the length is hardcoded to 32 bytes. If you |
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ask for less than 32 bytes, your code will only work with kernels |
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2.6.23 and later. */ |
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__s32 i2c_smbus_read_i2c_block_data(int file, __u8 command, __u8 length, |
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__u8 *values) |
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{ |
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union i2c_smbus_data data; |
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int i; |
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if (length > 32) |
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length = 32; |
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data.block[0] = length; |
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if (i2c_smbus_access(file, I2C_SMBUS_READ, command, |
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length == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN : |
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I2C_SMBUS_I2C_BLOCK_DATA, &data)) |
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return -1; |
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else { |
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for (i = 1; i <= data.block[0]; i++) |
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values[i-1] = data.block[i]; |
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return data.block[0]; |
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} |
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} |
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__s32 i2c_smbus_write_i2c_block_data(int file, __u8 command, __u8 length, |
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const __u8 *values) |
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{ |
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union i2c_smbus_data data; |
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int i; |
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if (length > 32) |
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length = 32; |
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for (i = 1; i <= length; i++) |
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data.block[i] = values[i-1]; |
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data.block[0] = length; |
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return i2c_smbus_access(file, I2C_SMBUS_WRITE, command, |
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I2C_SMBUS_I2C_BLOCK_BROKEN, &data); |
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} |
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/* Returns the number of read bytes */ |
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__s32 i2c_smbus_block_process_call(int file, __u8 command, __u8 length, |
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__u8 *values) |
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{ |
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union i2c_smbus_data data; |
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int i; |
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if (length > 32) |
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length = 32; |
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for (i = 1; i <= length; i++) |
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data.block[i] = values[i-1]; |
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data.block[0] = length; |
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if (i2c_smbus_access(file, I2C_SMBUS_WRITE, command, |
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I2C_SMBUS_BLOCK_PROC_CALL, &data)) |
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return -1; |
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else { |
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for (i = 1; i <= data.block[0]; i++) |
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values[i-1] = data.block[i]; |
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return data.block[0]; |
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} |
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} |
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