Move py-smbus to the i2c-tools package.

git-svn-id: http://lm-sensors.org/svn/i2c-tools/trunk@4497 7894878c-1315-0410-8ee3-d5d059ff63e0

py-smbus/README

@@ -0,0 +1,28 @@
+
+README: py-smbus
+
+Prerequisites:
+Be sure to build and install the lm-sensors userspace first.  This package
+requires one of the header files from that.
+
+To build:
+	$ python setup.py build
+
+To install (will also build if necessary):
+	$ python setup.py install
+
+For general build/install help:
+	$ python setup.py --help-commands
+
+Frequently Answered Question:
+
+Q: It's throwing exceptions, nothing works, what's wrong?
+
+  A1: You need write permissions to the i2c-dev devices.  Try running as root.
+
+  A2: Addresses in Linux/I2C are the most-sig 7 bits, right-justified.  E.g.
+	if your device uses address 0xc0 to write and 0xc1 to read, then use
+	address 0x60 with this module.
+
+  A3: Some other kernel driver has claimed that I2C address.  Unload it first.
+

py-smbus/setup.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+
+from distutils.core import setup, Extension
+
+setup(	name="smbus",
+	version="1.1",
+	description="Python bindings for Linux SMBus access through i2c-dev",
+	author="Mark M. Hoffman",
+	author_email="mhoffman@lightlink.com",
+	maintainer="Mark M. Hoffman",
+	maintainer_email="lm-sensors@lm-sensors.org",
+	license="GPLv2",
+	url="http://lm-sensors.org/",
+	ext_modules=[Extension("smbus", ["smbusmodule.c"])])

py-smbus/smbusmodule.c

@@ -0,0 +1,697 @@
+/*
+ * smbusmodule.c - Python bindings for Linux SMBus access through i2c-dev
+ * Copyright (C) 2005-2007 Mark M. Hoffman <mhoffman@lightlink.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#include <Python.h>
+#include "structmember.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <linux/i2c-dev.h>
+
+/*
+** These are required to build this module against Linux older than 2.6.23.
+*/
+#ifndef I2C_SMBUS_I2C_BLOCK_BROKEN
+#undef I2C_SMBUS_I2C_BLOCK_DATA
+#define I2C_SMBUS_I2C_BLOCK_BROKEN	6
+#define I2C_SMBUS_I2C_BLOCK_DATA	8
+#endif
+
+PyDoc_STRVAR(SMBus_module_doc,
+	"This module defines an object type that allows SMBus transactions\n"
+	"on Linux hosts.  The host kernel must have I2C support, I2C device\n"
+	"interface support, and a bus adapter driver.  All of these can be\n"
+	"either built-in to the kernel, or loaded from modules.\n"
+	"\n"
+	"Because the I2C device interface is opened R/W, users of this\n"
+	"module usually must have root permissions.\n");
+
+typedef struct {
+	PyObject_HEAD
+
+	int fd;		/* open file descriptor: /dev/i2c-?, or -1 */
+	int addr;	/* current client SMBus address */
+	int pec;	/* !0 => Packet Error Codes enabled */
+} SMBus;
+
+static PyObject *
+SMBus_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+	SMBus *self;
+
+	if ((self = (SMBus *)type->tp_alloc(type, 0)) == NULL)
+		return NULL;
+
+	self->fd = -1;
+	self->addr = -1;
+	self->pec = 0;
+
+	return (PyObject *)self;
+}
+
+PyDoc_STRVAR(SMBus_close_doc,
+	"close()\n\n"
+	"Disconnects the object from the bus.\n");
+
+static PyObject *
+SMBus_close(SMBus *self)
+{
+	if ((self->fd != -1) && (close(self->fd) == -1)) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	self->fd = -1;
+	self->addr = -1;
+	self->pec = 0;
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+static void
+SMBus_dealloc(SMBus *self)
+{
+	PyObject *ref = SMBus_close(self);
+	Py_XDECREF(ref);
+
+	self->ob_type->tp_free((PyObject *)self);
+}
+
+#define MAXPATH 16
+
+PyDoc_STRVAR(SMBus_open_doc,
+	"open(bus)\n\n"
+	"Connects the object to the specified SMBus.\n");
+
+static PyObject *
+SMBus_open(SMBus *self, PyObject *args, PyObject *kwds)
+{
+	int bus;
+	char path[MAXPATH];
+
+	static char *kwlist[] = {"bus", NULL};
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "i:open", kwlist, &bus))
+		return NULL;
+
+	if (snprintf(path, MAXPATH, "/dev/i2c-%d", bus) >= MAXPATH) {
+		PyErr_SetString(PyExc_OverflowError,
+			"Bus number is invalid.");
+		return NULL;
+	}
+
+	if ((self->fd = open(path, O_RDWR, 0)) == -1) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+static int
+SMBus_init(SMBus *self, PyObject *args, PyObject *kwds)
+{
+	int bus = -1;
+
+	static char *kwlist[] = {"bus", NULL};
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "|i:__init__",
+			kwlist, &bus))
+		return -1;
+
+	if (bus >= 0) {
+		SMBus_open(self, args, kwds);
+		if (PyErr_Occurred())
+			return -1;
+	}
+
+	return 0;
+}
+
+/*
+ * private helper function, 0 => success, !0 => error
+ */
+static int
+SMBus_set_addr(SMBus *self, int addr)
+{
+	int ret = 0;
+
+	if (self->addr != addr) {
+		ret = ioctl(self->fd, I2C_SLAVE, addr);
+		self->addr = addr;
+	}
+
+	return ret;
+}
+
+#define SMBus_SET_ADDR(self, addr) do { \
+	if (SMBus_set_addr(self, addr)) { \
+		PyErr_SetFromErrno(PyExc_IOError); \
+		return NULL; \
+	} \
+} while(0)
+
+PyDoc_STRVAR(SMBus_write_quick_doc,
+	"write_quick(addr)\n\n"
+	"Perform SMBus Quick transaction.\n");
+
+static PyObject *
+SMBus_write_quick(SMBus *self, PyObject *args)
+{
+	int addr;
+	__s32 result;
+
+	if (!PyArg_ParseTuple(args, "i:write_quick", &addr))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	if ((result = i2c_smbus_write_quick(self->fd, I2C_SMBUS_WRITE))) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyDoc_STRVAR(SMBus_read_byte_doc,
+	"read_byte(addr) -> result\n\n"
+	"Perform SMBus Read Byte transaction.\n");
+
+static PyObject *
+SMBus_read_byte(SMBus *self, PyObject *args)
+{
+	int addr;
+	__s32 result;
+
+	if (!PyArg_ParseTuple(args, "i:read_byte", &addr))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	if ((result = i2c_smbus_read_byte(self->fd)) == -1) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	return Py_BuildValue("l", (long)result);
+}
+
+PyDoc_STRVAR(SMBus_write_byte_doc,
+	"write_byte(addr, val)\n\n"
+	"Perform SMBus Write Byte transaction.\n");
+
+static PyObject *
+SMBus_write_byte(SMBus *self, PyObject *args)
+{
+	int addr, val;
+	__s32 result;
+
+	if (!PyArg_ParseTuple(args, "ii:write_byte", &addr, &val))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	if ((result = i2c_smbus_write_byte(self->fd, (__u8)val)) == -1) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyDoc_STRVAR(SMBus_read_byte_data_doc,
+	"read_byte_data(addr, cmd) -> result\n\n"
+	"Perform SMBus Read Byte Data transaction.\n");
+
+static PyObject *
+SMBus_read_byte_data(SMBus *self, PyObject *args)
+{
+	int addr, cmd;
+	__s32 result;
+
+	if (!PyArg_ParseTuple(args, "ii:read_byte_data", &addr, &cmd))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	if ((result = i2c_smbus_read_byte_data(self->fd, (__u8)cmd)) == -1) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	return Py_BuildValue("l", (long)result);
+}
+
+PyDoc_STRVAR(SMBus_write_byte_data_doc,
+	"write_byte_data(addr, cmd, val)\n\n"
+	"Perform SMBus Write Byte Data transaction.\n");
+
+static PyObject *
+SMBus_write_byte_data(SMBus *self, PyObject *args)
+{
+	int addr, cmd, val;
+	__s32 result;
+
+	if (!PyArg_ParseTuple(args, "iii:write_byte_data", &addr, &cmd, &val))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	if ((result = i2c_smbus_write_byte_data(self->fd,
+				(__u8)cmd, (__u8)val)) == -1) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyDoc_STRVAR(SMBus_read_word_data_doc,
+	"read_word_data(addr, cmd) -> result\n\n"
+	"Perform SMBus Read Word Data transaction.\n");
+
+static PyObject *
+SMBus_read_word_data(SMBus *self, PyObject *args)
+{
+	int addr, cmd;
+	__s32 result;
+
+	if (!PyArg_ParseTuple(args, "ii:read_word_data", &addr, &cmd))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	if ((result = i2c_smbus_read_word_data(self->fd, (__u8)cmd)) == -1) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	return Py_BuildValue("l", (long)result);
+}
+
+PyDoc_STRVAR(SMBus_write_word_data_doc,
+	"write_word_data(addr, cmd, val)\n\n"
+	"Perform SMBus Write Word Data transaction.\n");
+
+static PyObject *
+SMBus_write_word_data(SMBus *self, PyObject *args)
+{
+	int addr, cmd, val;
+	__s32 result;
+
+	if (!PyArg_ParseTuple(args, "iii:write_word_data", &addr, &cmd, &val))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	if ((result = i2c_smbus_write_word_data(self->fd,
+				(__u8)cmd, (__u16)val)) == -1) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyDoc_STRVAR(SMBus_process_call_doc,
+	"process_call(addr, cmd, val)\n\n"
+	"Perform SMBus Process Call transaction.\n");
+
+static PyObject *
+SMBus_process_call(SMBus *self, PyObject *args)
+{
+	int addr, cmd, val;
+	__s32 result;
+
+	if (!PyArg_ParseTuple(args, "iii:process_call", &addr, &cmd, &val))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	if ((result = i2c_smbus_process_call(self->fd,
+				(__u8)cmd, (__u16)val)) == -1) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+/*
+ * private helper function; returns a new list of integers
+ */
+static PyObject *
+SMBus_buf_to_list(__u8 const *buf, int len)
+{
+	PyObject *list = PyList_New(len);
+	int ii;
+
+	if (list == NULL)
+		return NULL;
+
+	for (ii = 0; ii < len; ii++) {
+		PyObject *val = Py_BuildValue("l", (long)buf[ii]);
+		PyList_SET_ITEM(list, ii, val);
+	}
+	return list;
+}
+
+PyDoc_STRVAR(SMBus_read_block_data_doc,
+	"read_block_data(addr, cmd) -> results\n\n"
+	"Perform SMBus Read Block Data transaction.\n");
+
+static PyObject *
+SMBus_read_block_data(SMBus *self, PyObject *args)
+{
+	int addr, cmd;
+	union i2c_smbus_data data;
+
+	if (!PyArg_ParseTuple(args, "ii:read_block_data", &addr, &cmd))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	/* save a bit of code by calling the access function directly */
+	if (i2c_smbus_access(self->fd, I2C_SMBUS_READ, (__u8)cmd,
+				I2C_SMBUS_BLOCK_DATA, &data)) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	/* first byte of the block contains (remaining) data length */
+	return SMBus_buf_to_list(&data.block[1], data.block[0]);
+}
+
+/*
+ * private helper function: convert an integer list to union i2c_smbus_data
+ */
+static int
+SMBus_list_to_data(PyObject *list, union i2c_smbus_data *data)
+{
+	static char *msg = "Third argument must be a list of at least one, "
+				"but not more than 32 integers";
+	int ii, len;
+
+	if (!PyList_Check(list)) {
+		PyErr_SetString(PyExc_TypeError, msg);
+		return 0; /* fail */
+	}
+
+	if ((len = PyList_GET_SIZE(list)) > 32) {
+		PyErr_SetString(PyExc_OverflowError, msg);
+		return 0; /* fail */
+	}
+
+	/* first byte is the length */
+	data->block[0] = (__u8)len;
+
+	for (ii = 0; ii < len; ii++) {
+		PyObject *val = PyList_GET_ITEM(list, ii);
+		if (!PyInt_Check(val)) {
+			PyErr_SetString(PyExc_TypeError, msg);
+			return 0; /* fail */
+		}
+		data->block[ii+1] = (__u8)PyInt_AS_LONG(val);
+	}
+
+	return 1; /* success */
+}
+
+PyDoc_STRVAR(SMBus_write_block_data_doc,
+	"write_block_data(addr, cmd, [vals])\n\n"
+	"Perform SMBus Write Block Data transaction.\n");
+
+static PyObject *
+SMBus_write_block_data(SMBus *self, PyObject *args)
+{
+	int addr, cmd;
+	union i2c_smbus_data data;
+
+	if (!PyArg_ParseTuple(args, "iiO&:write_block_data", &addr, &cmd,
+				SMBus_list_to_data, &data))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	/* save a bit of code by calling the access function directly */
+	if (i2c_smbus_access(self->fd, I2C_SMBUS_WRITE, (__u8)cmd,
+				I2C_SMBUS_BLOCK_DATA, &data)) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyDoc_STRVAR(SMBus_block_process_call_doc,
+	"block_process_call(addr, cmd, [vals]) -> results\n\n"
+	"Perform SMBus Block Process Call transaction.\n");
+
+static PyObject *
+SMBus_block_process_call(SMBus *self, PyObject *args)
+{
+	int addr, cmd;
+	union i2c_smbus_data data;
+
+	if (!PyArg_ParseTuple(args, "iiO&:block_process_call", &addr, &cmd,
+			SMBus_list_to_data, &data))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	/* save a bit of code by calling the access function directly */
+	if (i2c_smbus_access(self->fd, I2C_SMBUS_WRITE, (__u8)cmd,
+				I2C_SMBUS_BLOCK_PROC_CALL, &data)) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	/* first byte of the block contains (remaining) data length */
+	return SMBus_buf_to_list(&data.block[1], data.block[0]);
+}
+
+PyDoc_STRVAR(SMBus_read_i2c_block_data_doc,
+	"read_i2c_block_data(addr, cmd, len=32) -> results\n\n"
+	"Perform I2C Block Read transaction.\n");
+
+static PyObject *
+SMBus_read_i2c_block_data(SMBus *self, PyObject *args)
+{
+	int addr, cmd, len=32;
+	union i2c_smbus_data data;
+
+	if (!PyArg_ParseTuple(args, "ii|i:read_i2c_block_data", &addr, &cmd,
+			&len))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	data.block[0] = len;
+	/* save a bit of code by calling the access function directly */
+	if (i2c_smbus_access(self->fd, I2C_SMBUS_READ, (__u8)cmd,
+				len == 32 ? I2C_SMBUS_I2C_BLOCK_BROKEN:
+				I2C_SMBUS_I2C_BLOCK_DATA, &data)) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	/* first byte of the block contains (remaining) data length */
+	return SMBus_buf_to_list(&data.block[1], data.block[0]);
+}
+
+PyDoc_STRVAR(SMBus_write_i2c_block_data_doc,
+	"write_i2c_block_data(addr, cmd, [vals])\n\n"
+	"Perform I2C Block Write transaction.\n");
+
+static PyObject *
+SMBus_write_i2c_block_data(SMBus *self, PyObject *args)
+{
+	int addr, cmd;
+	union i2c_smbus_data data;
+
+	if (!PyArg_ParseTuple(args, "iiO&:write_i2c_block_data", &addr, &cmd,
+			SMBus_list_to_data, &data))
+		return NULL;
+
+	SMBus_SET_ADDR(self, addr);
+
+	/* save a bit of code by calling the access function directly */
+	if (i2c_smbus_access(self->fd, I2C_SMBUS_WRITE, (__u8)cmd,
+				I2C_SMBUS_I2C_BLOCK_BROKEN, &data)) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyDoc_STRVAR(SMBus_type_doc,
+	"SMBus([bus]) -> SMBus\n\n"
+	"Return a new SMBus object that is (optionally) connected to the\n"
+	"specified I2C device interface.\n");
+
+static PyMethodDef SMBus_methods[] = {
+	{"open", (PyCFunction)SMBus_open, METH_VARARGS | METH_KEYWORDS,
+		SMBus_open_doc},
+	{"close", (PyCFunction)SMBus_close, METH_NOARGS,
+		SMBus_close_doc},
+	{"write_quick", (PyCFunction)SMBus_write_quick, METH_VARARGS,
+		SMBus_write_quick_doc},
+	{"read_byte", (PyCFunction)SMBus_read_byte, METH_VARARGS,
+		SMBus_read_byte_doc},
+	{"write_byte", (PyCFunction)SMBus_write_byte, METH_VARARGS,
+		SMBus_write_byte_doc},
+	{"read_byte_data", (PyCFunction)SMBus_read_byte_data, METH_VARARGS,
+		SMBus_read_byte_data_doc},
+	{"write_byte_data", (PyCFunction)SMBus_write_byte_data, METH_VARARGS,
+		SMBus_write_byte_data_doc},
+	{"read_word_data", (PyCFunction)SMBus_read_word_data, METH_VARARGS,
+		SMBus_read_word_data_doc},
+	{"write_word_data", (PyCFunction)SMBus_write_word_data, METH_VARARGS,
+		SMBus_write_word_data_doc},
+	{"process_call", (PyCFunction)SMBus_process_call, METH_VARARGS,
+		SMBus_process_call_doc},
+	{"read_block_data", (PyCFunction)SMBus_read_block_data, METH_VARARGS,
+		SMBus_read_block_data_doc},
+	{"write_block_data", (PyCFunction)SMBus_write_block_data, METH_VARARGS,
+		SMBus_write_block_data_doc},
+	{"block_process_call", (PyCFunction)SMBus_block_process_call,
+		METH_VARARGS, SMBus_block_process_call_doc},
+	{"read_i2c_block_data", (PyCFunction)SMBus_read_i2c_block_data,
+		METH_VARARGS, SMBus_read_i2c_block_data_doc},
+	{"write_i2c_block_data", (PyCFunction)SMBus_write_i2c_block_data,
+		METH_VARARGS, SMBus_write_i2c_block_data_doc},
+	{NULL},
+};
+
+static PyObject *
+SMBus_get_pec(SMBus *self, void *closure)
+{
+	PyObject *result = self->pec ? Py_True : Py_False;
+	Py_INCREF(result);
+	return result;
+}
+
+static int
+SMBus_set_pec(SMBus *self, PyObject *val, void *closure)
+{
+	int pec;
+
+	pec = PyObject_IsTrue(val);
+
+	if (val == NULL) {
+		PyErr_SetString(PyExc_TypeError,
+			"Cannot delete attribute");
+		return -1;
+	}
+	else if (pec == -1) {
+		PyErr_SetString(PyExc_TypeError, 
+			"The pec attribute must be a boolean.");
+		return -1;
+	}
+
+	if (self->pec != pec) {
+		if (ioctl(self->fd, I2C_PEC, pec)) {
+			PyErr_SetFromErrno(PyExc_IOError);
+			return -1;
+		}
+		self->pec = pec;
+	}
+
+	return 0;
+}
+
+static PyGetSetDef SMBus_getset[] = {
+	{"pec", (getter)SMBus_get_pec, (setter)SMBus_set_pec,
+			"True if Packet Error Codes (PEC) are enabled"},
+	{NULL},
+};
+
+static PyTypeObject SMBus_type = {
+	PyObject_HEAD_INIT(NULL)
+	0,				/* ob_size */
+	"SMBus",			/* tp_name */
+	sizeof(SMBus),			/* tp_basicsize */
+	0,				/* tp_itemsize */
+	(destructor)SMBus_dealloc,	/* tp_dealloc */
+	0,				/* tp_print */
+	0,				/* tp_getattr */
+	0,				/* tp_setattr */
+	0,				/* tp_compare */
+	0,				/* tp_repr */
+	0,				/* tp_as_number */
+	0,				/* tp_as_sequence */
+	0,				/* tp_as_mapping */
+	0,				/* tp_hash */
+	0,				/* tp_call */
+	0,				/* tp_str */
+	0,				/* tp_getattro */
+	0,				/* tp_setattro */
+	0,				/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT,		/* tp_flags */
+	SMBus_type_doc,			/* tp_doc */
+	0,				/* tp_traverse */
+	0,				/* tp_clear */
+	0,				/* tp_richcompare */
+	0,				/* tp_weaklistoffset */
+	0,				/* tp_iter */
+	0,				/* tp_iternext */
+	SMBus_methods,			/* tp_methods */
+	0,				/* tp_members */
+	SMBus_getset,			/* tp_getset */
+	0,				/* tp_base */
+	0,				/* tp_dict */
+	0,				/* tp_descr_get */
+	0,				/* tp_descr_set */
+	0,				/* tp_dictoffset */
+	(initproc)SMBus_init,		/* tp_init */
+	0,				/* tp_alloc */
+	SMBus_new,			/* tp_new */
+};
+
+static PyMethodDef SMBus_module_methods[] = {
+	{NULL}
+};
+
+#ifndef PyMODINIT_FUNC	/* declarations for DLL import/export */
+#define PyMODINIT_FUNC void
+#endif
+PyMODINIT_FUNC
+initsmbus(void) 
+{
+	PyObject* m;
+
+	if (PyType_Ready(&SMBus_type) < 0)
+		return;
+
+	m = Py_InitModule3("smbus", SMBus_module_methods, SMBus_module_doc);
+
+	Py_INCREF(&SMBus_type);
+	PyModule_AddObject(m, "SMBus", (PyObject *)&SMBus_type);
+}
+