Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1272 insertions, 0 deletions

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
new file mode 100644
index 000000000000..9011627d7eb0
--- /dev/null
+++ b/drivers/i2c/i2c-core.c
@@ -0,0 +1,1272 @@
+/* i2c-core.c - a device driver for the iic-bus interface		     */
+/* ------------------------------------------------------------------------- */
+/*   Copyright (C) 1995-99 Simon G. Vogl
+
+    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; either version 2 of the License, or
+    (at your option) any later version.
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.		     */
+/* ------------------------------------------------------------------------- */
+
+/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>.
+   All SMBus-related things are written by Frodo Looijaard <frodol@dds.nl>
+   SMBus 2.0 support by Mark Studebaker <mdsxyz123@yahoo.com>                */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/idr.h>
+#include <linux/seq_file.h>
+#include <asm/uaccess.h>
+
+
+static LIST_HEAD(adapters);
+static LIST_HEAD(drivers);
+static DECLARE_MUTEX(core_lists);
+static DEFINE_IDR(i2c_adapter_idr);
+
+/* match always succeeds, as we want the probe() to tell if we really accept this match */
+static int i2c_device_match(struct device *dev, struct device_driver *drv)
+{
+	return 1;
+}
+
+static int i2c_bus_suspend(struct device * dev, pm_message_t state)
+{
+	int rc = 0;
+
+	if (dev->driver && dev->driver->suspend)
+		rc = dev->driver->suspend(dev,state,0);
+	return rc;
+}
+
+static int i2c_bus_resume(struct device * dev)
+{
+	int rc = 0;
+	
+	if (dev->driver && dev->driver->resume)
+		rc = dev->driver->resume(dev,0);
+	return rc;
+}
+
+static struct bus_type i2c_bus_type = {
+	.name =		"i2c",
+	.match =	i2c_device_match,
+	.suspend =      i2c_bus_suspend,
+	.resume =       i2c_bus_resume,
+};
+
+static int i2c_device_probe(struct device *dev)
+{
+	return -ENODEV;
+}
+
+static int i2c_device_remove(struct device *dev)
+{
+	return 0;
+}
+
+static void i2c_adapter_dev_release(struct device *dev)
+{
+	struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
+	complete(&adap->dev_released);
+}
+
+static struct device_driver i2c_adapter_driver = {
+	.name =	"i2c_adapter",
+	.bus = &i2c_bus_type,
+	.probe = i2c_device_probe,
+	.remove = i2c_device_remove,
+};
+
+static void i2c_adapter_class_dev_release(struct class_device *dev)
+{
+	struct i2c_adapter *adap = class_dev_to_i2c_adapter(dev);
+	complete(&adap->class_dev_released);
+}
+
+static struct class i2c_adapter_class = {
+	.name =		"i2c-adapter",
+	.release =	&i2c_adapter_class_dev_release,
+};
+
+static ssize_t show_adapter_name(struct device *dev, char *buf)
+{
+	struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
+	return sprintf(buf, "%s\n", adap->name);
+}
+static DEVICE_ATTR(name, S_IRUGO, show_adapter_name, NULL);
+
+
+static void i2c_client_release(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	complete(&client->released);
+}
+
+static ssize_t show_client_name(struct device *dev, char *buf)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	return sprintf(buf, "%s\n", client->name);
+}
+
+/* 
+ * We can't use the DEVICE_ATTR() macro here as we want the same filename for a
+ * different type of a device.  So beware if the DEVICE_ATTR() macro ever
+ * changes, this definition will also have to change.
+ */
+static struct device_attribute dev_attr_client_name = {
+	.attr	= {.name = "name", .mode = S_IRUGO, .owner = THIS_MODULE },
+	.show	= &show_client_name,
+};
+
+
+/* ---------------------------------------------------
+ * registering functions 
+ * --------------------------------------------------- 
+ */
+
+/* -----
+ * i2c_add_adapter is called from within the algorithm layer,
+ * when a new hw adapter registers. A new device is register to be
+ * available for clients.
+ */
+int i2c_add_adapter(struct i2c_adapter *adap)
+{
+	int id, res = 0;
+	struct list_head   *item;
+	struct i2c_driver  *driver;
+
+	down(&core_lists);
+
+	if (idr_pre_get(&i2c_adapter_idr, GFP_KERNEL) == 0) {
+		res = -ENOMEM;
+		goto out_unlock;
+	}
+
+	res = idr_get_new(&i2c_adapter_idr, NULL, &id);
+	if (res < 0) {
+		if (res == -EAGAIN)
+			res = -ENOMEM;
+		goto out_unlock;
+	}
+
+	adap->nr =  id & MAX_ID_MASK;
+	init_MUTEX(&adap->bus_lock);
+	init_MUTEX(&adap->clist_lock);
+	list_add_tail(&adap->list,&adapters);
+	INIT_LIST_HEAD(&adap->clients);
+
+	/* Add the adapter to the driver core.
+	 * If the parent pointer is not set up,
+	 * we add this adapter to the host bus.
+	 */
+	if (adap->dev.parent == NULL)
+		adap->dev.parent = &platform_bus;
+	sprintf(adap->dev.bus_id, "i2c-%d", adap->nr);
+	adap->dev.driver = &i2c_adapter_driver;
+	adap->dev.release = &i2c_adapter_dev_release;
+	device_register(&adap->dev);
+	device_create_file(&adap->dev, &dev_attr_name);
+
+	/* Add this adapter to the i2c_adapter class */
+	memset(&adap->class_dev, 0x00, sizeof(struct class_device));
+	adap->class_dev.dev = &adap->dev;
+	adap->class_dev.class = &i2c_adapter_class;
+	strlcpy(adap->class_dev.class_id, adap->dev.bus_id, BUS_ID_SIZE);
+	class_device_register(&adap->class_dev);
+
+	/* inform drivers of new adapters */
+	list_for_each(item,&drivers) {
+		driver = list_entry(item, struct i2c_driver, list);
+		if (driver->flags & I2C_DF_NOTIFY)
+			/* We ignore the return code; if it fails, too bad */
+			driver->attach_adapter(adap);
+	}
+
+	dev_dbg(&adap->dev, "registered as adapter #%d\n", adap->nr);
+
+out_unlock:
+	up(&core_lists);
+	return res;
+}
+
+
+int i2c_del_adapter(struct i2c_adapter *adap)
+{
+	struct list_head  *item, *_n;
+	struct i2c_adapter *adap_from_list;
+	struct i2c_driver *driver;
+	struct i2c_client *client;
+	int res = 0;
+
+	down(&core_lists);
+
+	/* First make sure that this adapter was ever added */
+	list_for_each_entry(adap_from_list, &adapters, list) {
+		if (adap_from_list == adap)
+			break;
+	}
+	if (adap_from_list != adap) {
+		pr_debug("I2C: Attempting to delete an unregistered "
+			 "adapter\n");
+		res = -EINVAL;
+		goto out_unlock;
+	}
+
+	list_for_each(item,&drivers) {
+		driver = list_entry(item, struct i2c_driver, list);
+		if (driver->detach_adapter)
+			if ((res = driver->detach_adapter(adap))) {
+				dev_warn(&adap->dev, "can't detach adapter "
+					 "while detaching driver %s: driver not "
+					 "detached!", driver->name);
+				goto out_unlock;
+			}
+	}
+
+	/* detach any active clients. This must be done first, because
+	 * it can fail; in which case we give upp. */
+	list_for_each_safe(item, _n, &adap->clients) {
+		client = list_entry(item, struct i2c_client, list);
+
+		/* detaching devices is unconditional of the set notify
+		 * flag, as _all_ clients that reside on the adapter
+		 * must be deleted, as this would cause invalid states.
+		 */
+		if ((res=client->driver->detach_client(client))) {
+			dev_err(&adap->dev, "adapter not "
+				"unregistered, because client at "
+				"address %02x can't be detached. ",
+				client->addr);
+			goto out_unlock;
+		}
+	}
+
+	/* clean up the sysfs representation */
+	init_completion(&adap->dev_released);
+	init_completion(&adap->class_dev_released);
+	class_device_unregister(&adap->class_dev);
+	device_remove_file(&adap->dev, &dev_attr_name);
+	device_unregister(&adap->dev);
+	list_del(&adap->list);
+
+	/* wait for sysfs to drop all references */
+	wait_for_completion(&adap->dev_released);
+	wait_for_completion(&adap->class_dev_released);
+
+	/* free dynamically allocated bus id */
+	idr_remove(&i2c_adapter_idr, adap->nr);
+
+	dev_dbg(&adap->dev, "adapter unregistered\n");
+
+ out_unlock:
+	up(&core_lists);
+	return res;
+}
+
+
+/* -----
+ * What follows is the "upwards" interface: commands for talking to clients,
+ * which implement the functions to access the physical information of the
+ * chips.
+ */
+
+int i2c_add_driver(struct i2c_driver *driver)
+{
+	struct list_head   *item;
+	struct i2c_adapter *adapter;
+	int res = 0;
+
+	down(&core_lists);
+
+	/* add the driver to the list of i2c drivers in the driver core */
+	driver->driver.name = driver->name;
+	driver->driver.bus = &i2c_bus_type;
+	driver->driver.probe = i2c_device_probe;
+	driver->driver.remove = i2c_device_remove;
+
+	res = driver_register(&driver->driver);
+	if (res)
+		goto out_unlock;
+	
+	list_add_tail(&driver->list,&drivers);
+	pr_debug("i2c-core: driver %s registered.\n", driver->name);
+
+	/* now look for instances of driver on our adapters */
+	if (driver->flags & I2C_DF_NOTIFY) {
+		list_for_each(item,&adapters) {
+			adapter = list_entry(item, struct i2c_adapter, list);
+			driver->attach_adapter(adapter);
+		}
+	}
+
+ out_unlock:
+	up(&core_lists);
+	return res;
+}
+
+int i2c_del_driver(struct i2c_driver *driver)
+{
+	struct list_head   *item1, *item2, *_n;
+	struct i2c_client  *client;
+	struct i2c_adapter *adap;
+	
+	int res = 0;
+
+	down(&core_lists);
+
+	/* Have a look at each adapter, if clients of this driver are still
+	 * attached. If so, detach them to be able to kill the driver 
+	 * afterwards.
+	 */
+	pr_debug("i2c-core: unregister_driver - looking for clients.\n");
+	/* removing clients does not depend on the notify flag, else 
+	 * invalid operation might (will!) result, when using stale client
+	 * pointers.
+	 */
+	list_for_each(item1,&adapters) {
+		adap = list_entry(item1, struct i2c_adapter, list);
+		dev_dbg(&adap->dev, "examining adapter\n");
+		if (driver->detach_adapter) {
+			if ((res = driver->detach_adapter(adap))) {
+				dev_warn(&adap->dev, "while unregistering "
+				       "dummy driver %s, adapter could "
+				       "not be detached properly; driver "
+				       "not unloaded!",driver->name);
+				goto out_unlock;
+			}
+		} else {
+			list_for_each_safe(item2, _n, &adap->clients) {
+				client = list_entry(item2, struct i2c_client, list);
+				if (client->driver != driver)
+					continue;
+				pr_debug("i2c-core.o: detaching client %s:\n", client->name);
+				if ((res = driver->detach_client(client))) {
+					dev_err(&adap->dev, "while "
+						"unregistering driver "
+						"`%s', the client at "
+						"address %02x of "
+						"adapter could not "
+						"be detached; driver "
+						"not unloaded!",
+						driver->name,
+						client->addr);
+					goto out_unlock;
+				}
+			}
+		}
+	}
+
+	driver_unregister(&driver->driver);
+	list_del(&driver->list);
+	pr_debug("i2c-core: driver unregistered: %s\n", driver->name);
+
+ out_unlock:
+	up(&core_lists);
+	return 0;
+}
+
+static int __i2c_check_addr(struct i2c_adapter *adapter, unsigned int addr)
+{
+	struct list_head   *item;
+	struct i2c_client  *client;
+
+	list_for_each(item,&adapter->clients) {
+		client = list_entry(item, struct i2c_client, list);
+		if (client->addr == addr)
+			return -EBUSY;
+	}
+	return 0;
+}
+
+int i2c_check_addr(struct i2c_adapter *adapter, int addr)
+{
+	int rval;
+
+	down(&adapter->clist_lock);
+	rval = __i2c_check_addr(adapter, addr);
+	up(&adapter->clist_lock);
+
+	return rval;
+}
+
+int i2c_attach_client(struct i2c_client *client)
+{
+	struct i2c_adapter *adapter = client->adapter;
+
+	down(&adapter->clist_lock);
+	if (__i2c_check_addr(client->adapter, client->addr)) {
+		up(&adapter->clist_lock);
+		return -EBUSY;
+	}
+	list_add_tail(&client->list,&adapter->clients);
+	up(&adapter->clist_lock);
+	
+	if (adapter->client_register)  {
+		if (adapter->client_register(client))  {
+			dev_warn(&adapter->dev, "warning: client_register "
+				"seems to have failed for client %02x\n",
+				client->addr);
+		}
+	}
+
+	dev_dbg(&adapter->dev, "client [%s] registered to adapter\n",
+		client->name);
+
+	if (client->flags & I2C_CLIENT_ALLOW_USE)
+		client->usage_count = 0;
+
+	client->dev.parent = &client->adapter->dev;
+	client->dev.driver = &client->driver->driver;
+	client->dev.bus = &i2c_bus_type;
+	client->dev.release = &i2c_client_release;
+	
+	snprintf(&client->dev.bus_id[0], sizeof(client->dev.bus_id),
+		"%d-%04x", i2c_adapter_id(adapter), client->addr);
+	pr_debug("registering %s\n", client->dev.bus_id);
+	device_register(&client->dev);
+	device_create_file(&client->dev, &dev_attr_client_name);
+	
+	return 0;
+}
+
+
+int i2c_detach_client(struct i2c_client *client)
+{
+	struct i2c_adapter *adapter = client->adapter;
+	int res = 0;
+	
+	if ((client->flags & I2C_CLIENT_ALLOW_USE) && (client->usage_count > 0))
+		return -EBUSY;
+
+	if (adapter->client_unregister)  {
+		res = adapter->client_unregister(client);
+		if (res) {
+			dev_err(&client->dev,
+			       "client_unregister [%s] failed, "
+			       "client not detached", client->name);
+			goto out;
+		}
+	}
+
+	down(&adapter->clist_lock);
+	list_del(&client->list);
+	init_completion(&client->released);
+	device_remove_file(&client->dev, &dev_attr_client_name);
+	device_unregister(&client->dev);
+	up(&adapter->clist_lock);
+	wait_for_completion(&client->released);
+
+ out:
+	return res;
+}
+
+static int i2c_inc_use_client(struct i2c_client *client)
+{
+
+	if (!try_module_get(client->driver->owner))
+		return -ENODEV;
+	if (!try_module_get(client->adapter->owner)) {
+		module_put(client->driver->owner);
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static void i2c_dec_use_client(struct i2c_client *client)
+{
+	module_put(client->driver->owner);
+	module_put(client->adapter->owner);
+}
+
+int i2c_use_client(struct i2c_client *client)
+{
+	int ret;
+
+	ret = i2c_inc_use_client(client);
+	if (ret)
+		return ret;
+
+	if (client->flags & I2C_CLIENT_ALLOW_USE) {
+		if (client->flags & I2C_CLIENT_ALLOW_MULTIPLE_USE)
+			client->usage_count++;
+		else if (client->usage_count > 0) 
+			goto busy;
+		else 
+			client->usage_count++;
+	}
+
+	return 0;
+ busy:
+	i2c_dec_use_client(client);
+	return -EBUSY;
+}
+
+int i2c_release_client(struct i2c_client *client)
+{
+	if(client->flags & I2C_CLIENT_ALLOW_USE) {
+		if(client->usage_count>0)
+			client->usage_count--;
+		else {
+			pr_debug("i2c-core: %s used one too many times\n",
+				__FUNCTION__);
+			return -EPERM;
+		}
+	}
+	
+	i2c_dec_use_client(client);
+	
+	return 0;
+}
+
+void i2c_clients_command(struct i2c_adapter *adap, unsigned int cmd, void *arg)
+{
+	struct list_head  *item;
+	struct i2c_client *client;
+
+	down(&adap->clist_lock);
+	list_for_each(item,&adap->clients) {
+		client = list_entry(item, struct i2c_client, list);
+		if (!try_module_get(client->driver->owner))
+			continue;
+		if (NULL != client->driver->command) {
+			up(&adap->clist_lock);
+			client->driver->command(client,cmd,arg);
+			down(&adap->clist_lock);
+		}
+		module_put(client->driver->owner);
+       }
+       up(&adap->clist_lock);
+}
+
+static int __init i2c_init(void)
+{
+	int retval;
+
+	retval = bus_register(&i2c_bus_type);
+	if (retval)
+		return retval;
+	retval = driver_register(&i2c_adapter_driver);
+	if (retval)
+		return retval;
+	return class_register(&i2c_adapter_class);
+}
+
+static void __exit i2c_exit(void)
+{
+	class_unregister(&i2c_adapter_class);
+	driver_unregister(&i2c_adapter_driver);
+	bus_unregister(&i2c_bus_type);
+}
+
+subsys_initcall(i2c_init);
+module_exit(i2c_exit);
+
+/* ----------------------------------------------------
+ * the functional interface to the i2c busses.
+ * ----------------------------------------------------
+ */
+
+int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg *msgs, int num)
+{
+	int ret;
+
+	if (adap->algo->master_xfer) {
+#ifdef DEBUG
+		for (ret = 0; ret < num; ret++) {
+			dev_dbg(&adap->dev, "master_xfer[%d] %c, addr=0x%02x, "
+				"len=%d\n", ret, msgs[ret].flags & I2C_M_RD ?
+				'R' : 'W', msgs[ret].addr, msgs[ret].len);
+		}
+#endif
+
+		down(&adap->bus_lock);
+		ret = adap->algo->master_xfer(adap,msgs,num);
+		up(&adap->bus_lock);
+
+		return ret;
+	} else {
+		dev_dbg(&adap->dev, "I2C level transfers not supported\n");
+		return -ENOSYS;
+	}
+}
+
+int i2c_master_send(struct i2c_client *client,const char *buf ,int count)
+{
+	int ret;
+	struct i2c_adapter *adap=client->adapter;
+	struct i2c_msg msg;
+
+	if (client->adapter->algo->master_xfer) {
+		msg.addr   = client->addr;
+		msg.flags = client->flags & I2C_M_TEN;
+		msg.len = count;
+		msg.buf = (char *)buf;
+	
+		dev_dbg(&client->adapter->dev, "master_send: writing %d bytes.\n",
+			count);
+	
+		down(&adap->bus_lock);
+		ret = adap->algo->master_xfer(adap,&msg,1);
+		up(&adap->bus_lock);
+
+		/* if everything went ok (i.e. 1 msg transmitted), return #bytes
+		 * transmitted, else error code.
+		 */
+		return (ret == 1 )? count : ret;
+	} else {
+		dev_err(&client->adapter->dev, "I2C level transfers not supported\n");
+		return -ENOSYS;
+	}
+}
+
+int i2c_master_recv(struct i2c_client *client, char *buf ,int count)
+{
+	struct i2c_adapter *adap=client->adapter;
+	struct i2c_msg msg;
+	int ret;
+	if (client->adapter->algo->master_xfer) {
+		msg.addr   = client->addr;
+		msg.flags = client->flags & I2C_M_TEN;
+		msg.flags |= I2C_M_RD;
+		msg.len = count;
+		msg.buf = buf;
+
+		dev_dbg(&client->adapter->dev, "master_recv: reading %d bytes.\n",
+			count);
+	
+		down(&adap->bus_lock);
+		ret = adap->algo->master_xfer(adap,&msg,1);
+		up(&adap->bus_lock);
+	
+		dev_dbg(&client->adapter->dev, "master_recv: return:%d (count:%d, addr:0x%02x)\n",
+			ret, count, client->addr);
+	
+		/* if everything went ok (i.e. 1 msg transmitted), return #bytes
+	 	* transmitted, else error code.
+	 	*/
+		return (ret == 1 )? count : ret;
+	} else {
+		dev_err(&client->adapter->dev, "I2C level transfers not supported\n");
+		return -ENOSYS;
+	}
+}
+
+
+int i2c_control(struct i2c_client *client,
+	unsigned int cmd, unsigned long arg)
+{
+	int ret = 0;
+	struct i2c_adapter *adap = client->adapter;
+
+	dev_dbg(&client->adapter->dev, "i2c ioctl, cmd: 0x%x, arg: %#lx\n", cmd, arg);
+	switch (cmd) {
+		case I2C_RETRIES:
+			adap->retries = arg;
+			break;
+		case I2C_TIMEOUT:
+			adap->timeout = arg;
+			break;
+		default:
+			if (adap->algo->algo_control!=NULL)
+				ret = adap->algo->algo_control(adap,cmd,arg);
+	}
+	return ret;
+}
+
+/* ----------------------------------------------------
+ * the i2c address scanning function
+ * Will not work for 10-bit addresses!
+ * ----------------------------------------------------
+ */
+int i2c_probe(struct i2c_adapter *adapter,
+	      struct i2c_client_address_data *address_data,
+	      int (*found_proc) (struct i2c_adapter *, int, int))
+{
+	int addr,i,found,err;
+	int adap_id = i2c_adapter_id(adapter);
+
+	/* Forget it if we can't probe using SMBUS_QUICK */
+	if (! i2c_check_functionality(adapter,I2C_FUNC_SMBUS_QUICK))
+		return -1;
+
+	for (addr = 0x00; addr <= 0x7f; addr++) {
+
+		/* Skip if already in use */
+		if (i2c_check_addr(adapter,addr))
+			continue;
+
+		/* If it is in one of the force entries, we don't do any detection
+		   at all */
+		found = 0;
+
+		for (i = 0; !found && (address_data->force[i] != I2C_CLIENT_END); i += 2) {
+			if (((adap_id == address_data->force[i]) || 
+			     (address_data->force[i] == ANY_I2C_BUS)) &&
+			     (addr == address_data->force[i+1])) {
+				dev_dbg(&adapter->dev, "found force parameter for adapter %d, addr %04x\n",
+					adap_id, addr);
+				if ((err = found_proc(adapter,addr,0)))
+					return err;
+				found = 1;
+			}
+		}
+		if (found) 
+			continue;
+
+		/* If this address is in one of the ignores, we can forget about
+		   it right now */
+		for (i = 0;
+		     !found && (address_data->ignore[i] != I2C_CLIENT_END);
+		     i += 2) {
+			if (((adap_id == address_data->ignore[i]) || 
+			    ((address_data->ignore[i] == ANY_I2C_BUS))) &&
+			    (addr == address_data->ignore[i+1])) {
+				dev_dbg(&adapter->dev, "found ignore parameter for adapter %d, "
+					"addr %04x\n", adap_id ,addr);
+				found = 1;
+			}
+		}
+		for (i = 0;
+		     !found && (address_data->ignore_range[i] != I2C_CLIENT_END);
+		     i += 3) {
+			if (((adap_id == address_data->ignore_range[i]) ||
+			    ((address_data->ignore_range[i]==ANY_I2C_BUS))) &&
+			    (addr >= address_data->ignore_range[i+1]) &&
+			    (addr <= address_data->ignore_range[i+2])) {
+				dev_dbg(&adapter->dev, "found ignore_range parameter for adapter %d, "
+					"addr %04x\n", adap_id,addr);
+				found = 1;
+			}
+		}
+		if (found) 
+			continue;
+
+		/* Now, we will do a detection, but only if it is in the normal or 
+		   probe entries */  
+		for (i = 0;
+		     !found && (address_data->normal_i2c[i] != I2C_CLIENT_END);
+		     i += 1) {
+			if (addr == address_data->normal_i2c[i]) {
+				found = 1;
+				dev_dbg(&adapter->dev, "found normal i2c entry for adapter %d, "
+					"addr %02x\n", adap_id, addr);
+			}
+		}
+
+		for (i = 0;
+		     !found && (address_data->normal_i2c_range[i] != I2C_CLIENT_END);
+		     i += 2) {
+			if ((addr >= address_data->normal_i2c_range[i]) &&
+			    (addr <= address_data->normal_i2c_range[i+1])) {
+				found = 1;
+				dev_dbg(&adapter->dev, "found normal i2c_range entry for adapter %d, "
+					"addr %04x\n", adap_id,addr);
+			}
+		}
+
+		for (i = 0;
+		     !found && (address_data->probe[i] != I2C_CLIENT_END);
+		     i += 2) {
+			if (((adap_id == address_data->probe[i]) ||
+			    ((address_data->probe[i] == ANY_I2C_BUS))) &&
+			    (addr == address_data->probe[i+1])) {
+				found = 1;
+				dev_dbg(&adapter->dev, "found probe parameter for adapter %d, "
+					"addr %04x\n", adap_id,addr);
+			}
+		}
+		for (i = 0;
+		     !found && (address_data->probe_range[i] != I2C_CLIENT_END);
+		     i += 3) {
+			if (((adap_id == address_data->probe_range[i]) ||
+			   (address_data->probe_range[i] == ANY_I2C_BUS)) &&
+			   (addr >= address_data->probe_range[i+1]) &&
+			   (addr <= address_data->probe_range[i+2])) {
+				found = 1;
+				dev_dbg(&adapter->dev, "found probe_range parameter for adapter %d, "
+					"addr %04x\n", adap_id,addr);
+			}
+		}
+		if (!found) 
+			continue;
+
+		/* OK, so we really should examine this address. First check
+		   whether there is some client here at all! */
+		if (i2c_smbus_xfer(adapter,addr,0,0,0,I2C_SMBUS_QUICK,NULL) >= 0)
+			if ((err = found_proc(adapter,addr,-1)))
+				return err;
+	}
+	return 0;
+}
+
+/*
+ * return id number for a specific adapter
+ */
+int i2c_adapter_id(struct i2c_adapter *adap)
+{
+	return adap->nr;
+}
+
+struct i2c_adapter* i2c_get_adapter(int id)
+{
+	struct list_head   *item;
+	struct i2c_adapter *adapter;
+	
+	down(&core_lists);
+	list_for_each(item,&adapters) {
+		adapter = list_entry(item, struct i2c_adapter, list);
+		if (id == adapter->nr &&
+		    try_module_get(adapter->owner)) {
+			up(&core_lists);
+			return adapter;
+		}
+	}
+	up(&core_lists);
+	return NULL;
+}
+
+void i2c_put_adapter(struct i2c_adapter *adap)
+{
+	module_put(adap->owner);
+}
+
+/* The SMBus parts */
+
+#define POLY    (0x1070U << 3) 
+static u8
+crc8(u16 data)
+{
+	int i;
+  
+	for(i = 0; i < 8; i++) {
+		if (data & 0x8000) 
+			data = data ^ POLY;
+		data = data << 1;
+	}
+	return (u8)(data >> 8);
+}
+
+/* CRC over count bytes in the first array plus the bytes in the rest
+   array if it is non-null. rest[0] is the (length of rest) - 1
+   and is included. */
+static u8 i2c_smbus_partial_pec(u8 crc, int count, u8 *first, u8 *rest)
+{
+	int i;
+
+	for(i = 0; i < count; i++)
+		crc = crc8((crc ^ first[i]) << 8);
+	if(rest != NULL)
+		for(i = 0; i <= rest[0]; i++)
+			crc = crc8((crc ^ rest[i]) << 8);
+	return crc;
+}
+
+static u8 i2c_smbus_pec(int count, u8 *first, u8 *rest)
+{
+	return i2c_smbus_partial_pec(0, count, first, rest);
+}
+
+/* Returns new "size" (transaction type)
+   Note that we convert byte to byte_data and byte_data to word_data
+   rather than invent new xxx_PEC transactions. */
+static int i2c_smbus_add_pec(u16 addr, u8 command, int size,
+			     union i2c_smbus_data *data)
+{
+	u8 buf[3];
+
+	buf[0] = addr << 1;
+	buf[1] = command;
+	switch(size) {
+		case I2C_SMBUS_BYTE:
+			data->byte = i2c_smbus_pec(2, buf, NULL);
+			size = I2C_SMBUS_BYTE_DATA;
+			break;
+		case I2C_SMBUS_BYTE_DATA:
+			buf[2] = data->byte;
+			data->word = buf[2] ||
+			            (i2c_smbus_pec(3, buf, NULL) << 8);
+			size = I2C_SMBUS_WORD_DATA;
+			break;
+		case I2C_SMBUS_WORD_DATA:
+			/* unsupported */
+			break;
+		case I2C_SMBUS_BLOCK_DATA:
+			data->block[data->block[0] + 1] =
+			             i2c_smbus_pec(2, buf, data->block);
+			size = I2C_SMBUS_BLOCK_DATA_PEC;
+			break;
+	}
+	return size;	
+}
+
+static int i2c_smbus_check_pec(u16 addr, u8 command, int size, u8 partial,
+			       union i2c_smbus_data *data)
+{
+	u8 buf[3], rpec, cpec;
+
+	buf[1] = command;
+	switch(size) {
+		case I2C_SMBUS_BYTE_DATA:
+			buf[0] = (addr << 1) | 1;
+			cpec = i2c_smbus_pec(2, buf, NULL);
+			rpec = data->byte;
+			break;
+		case I2C_SMBUS_WORD_DATA:
+			buf[0] = (addr << 1) | 1;
+			buf[2] = data->word & 0xff;
+			cpec = i2c_smbus_pec(3, buf, NULL);
+			rpec = data->word >> 8;
+			break;
+		case I2C_SMBUS_WORD_DATA_PEC:
+			/* unsupported */
+			cpec = rpec = 0;
+			break;
+		case I2C_SMBUS_PROC_CALL_PEC:
+			/* unsupported */
+			cpec = rpec = 0;
+			break;
+		case I2C_SMBUS_BLOCK_DATA_PEC:
+			buf[0] = (addr << 1);
+			buf[2] = (addr << 1) | 1;
+			cpec = i2c_smbus_pec(3, buf, data->block);
+			rpec = data->block[data->block[0] + 1];
+			break;
+		case I2C_SMBUS_BLOCK_PROC_CALL_PEC:
+			buf[0] = (addr << 1) | 1;
+			rpec = i2c_smbus_partial_pec(partial, 1,
+			                             buf, data->block);
+			cpec = data->block[data->block[0] + 1];
+			break;
+		default:
+			cpec = rpec = 0;
+			break;
+	}
+	if (rpec != cpec) {
+		pr_debug("i2c-core: Bad PEC 0x%02x vs. 0x%02x\n",
+			rpec, cpec);
+		return -1;
+	}
+	return 0;	
+}
+
+s32 i2c_smbus_write_quick(struct i2c_client *client, u8 value)
+{
+	return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+ 	                      value,0,I2C_SMBUS_QUICK,NULL);
+}
+
+s32 i2c_smbus_read_byte(struct i2c_client *client)
+{
+	union i2c_smbus_data data;
+	if (i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+	                   I2C_SMBUS_READ,0,I2C_SMBUS_BYTE, &data))
+		return -1;
+	else
+		return 0x0FF & data.byte;
+}
+
+s32 i2c_smbus_write_byte(struct i2c_client *client, u8 value)
+{
+	union i2c_smbus_data data;	/* only for PEC */
+	return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+	                      I2C_SMBUS_WRITE,value, I2C_SMBUS_BYTE,&data);
+}
+
+s32 i2c_smbus_read_byte_data(struct i2c_client *client, u8 command)
+{
+	union i2c_smbus_data data;
+	if (i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+	                   I2C_SMBUS_READ,command, I2C_SMBUS_BYTE_DATA,&data))
+		return -1;
+	else
+		return 0x0FF & data.byte;
+}
+
+s32 i2c_smbus_write_byte_data(struct i2c_client *client, u8 command, u8 value)
+{
+	union i2c_smbus_data data;
+	data.byte = value;
+	return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+	                      I2C_SMBUS_WRITE,command,
+	                      I2C_SMBUS_BYTE_DATA,&data);
+}
+
+s32 i2c_smbus_read_word_data(struct i2c_client *client, u8 command)
+{
+	union i2c_smbus_data data;
+	if (i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+	                   I2C_SMBUS_READ,command, I2C_SMBUS_WORD_DATA, &data))
+		return -1;
+	else
+		return 0x0FFFF & data.word;
+}
+
+s32 i2c_smbus_write_word_data(struct i2c_client *client, u8 command, u16 value)
+{
+	union i2c_smbus_data data;
+	data.word = value;
+	return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+	                      I2C_SMBUS_WRITE,command,
+	                      I2C_SMBUS_WORD_DATA,&data);
+}
+
+s32 i2c_smbus_write_block_data(struct i2c_client *client, u8 command,
+			       u8 length, u8 *values)
+{
+	union i2c_smbus_data data;
+	int i;
+	if (length > I2C_SMBUS_BLOCK_MAX)
+		length = I2C_SMBUS_BLOCK_MAX;
+	for (i = 1; i <= length; i++)
+		data.block[i] = values[i-1];
+	data.block[0] = length;
+	return i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+			      I2C_SMBUS_WRITE,command,
+			      I2C_SMBUS_BLOCK_DATA,&data);
+}
+
+/* Returns the number of read bytes */
+s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command, u8 *values)
+{
+	union i2c_smbus_data data;
+	int i;
+	if (i2c_smbus_xfer(client->adapter,client->addr,client->flags,
+	                      I2C_SMBUS_READ,command,
+	                      I2C_SMBUS_I2C_BLOCK_DATA,&data))
+		return -1;
+	else {
+		for (i = 1; i <= data.block[0]; i++)
+			values[i-1] = data.block[i];
+		return data.block[0];
+	}
+}
+
+/* Simulate a SMBus command using the i2c protocol 
+   No checking of parameters is done!  */
+static s32 i2c_smbus_xfer_emulated(struct i2c_adapter * adapter, u16 addr, 
+                                   unsigned short flags,
+                                   char read_write, u8 command, int size, 
+                                   union i2c_smbus_data * data)
+{
+	/* So we need to generate a series of msgs. In the case of writing, we
+	  need to use only one message; when reading, we need two. We initialize
+	  most things with sane defaults, to keep the code below somewhat
+	  simpler. */
+	unsigned char msgbuf0[34];
+	unsigned char msgbuf1[34];
+	int num = read_write == I2C_SMBUS_READ?2:1;
+	struct i2c_msg msg[2] = { { addr, flags, 1, msgbuf0 }, 
+	                          { addr, flags | I2C_M_RD, 0, msgbuf1 }
+	                        };
+	int i;
+
+	msgbuf0[0] = command;
+	switch(size) {
+	case I2C_SMBUS_QUICK:
+		msg[0].len = 0;
+		/* Special case: The read/write field is used as data */
+		msg[0].flags = flags | (read_write==I2C_SMBUS_READ)?I2C_M_RD:0;
+		num = 1;
+		break;
+	case I2C_SMBUS_BYTE:
+		if (read_write == I2C_SMBUS_READ) {
+			/* Special case: only a read! */
+			msg[0].flags = I2C_M_RD | flags;
+			num = 1;
+		}
+		break;
+	case I2C_SMBUS_BYTE_DATA:
+		if (read_write == I2C_SMBUS_READ)
+			msg[1].len = 1;
+		else {
+			msg[0].len = 2;
+			msgbuf0[1] = data->byte;
+		}
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		if (read_write == I2C_SMBUS_READ)
+			msg[1].len = 2;
+		else {
+			msg[0].len=3;
+			msgbuf0[1] = data->word & 0xff;
+			msgbuf0[2] = (data->word >> 8) & 0xff;
+		}
+		break;
+	case I2C_SMBUS_PROC_CALL:
+		num = 2; /* Special case */
+		read_write = I2C_SMBUS_READ;
+		msg[0].len = 3;
+		msg[1].len = 2;
+		msgbuf0[1] = data->word & 0xff;
+		msgbuf0[2] = (data->word >> 8) & 0xff;
+		break;
+	case I2C_SMBUS_BLOCK_DATA:
+	case I2C_SMBUS_BLOCK_DATA_PEC:
+		if (read_write == I2C_SMBUS_READ) {
+			dev_err(&adapter->dev, "Block read not supported "
+			       "under I2C emulation!\n");
+			return -1;
+		} else {
+			msg[0].len = data->block[0] + 2;
+			if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 2) {
+				dev_err(&adapter->dev, "smbus_access called with "
+				       "invalid block write size (%d)\n",
+				       data->block[0]);
+				return -1;
+			}
+			if(size == I2C_SMBUS_BLOCK_DATA_PEC)
+				(msg[0].len)++;
+			for (i = 1; i <= msg[0].len; i++)
+				msgbuf0[i] = data->block[i-1];
+		}
+		break;
+	case I2C_SMBUS_BLOCK_PROC_CALL:
+	case I2C_SMBUS_BLOCK_PROC_CALL_PEC:
+		dev_dbg(&adapter->dev, "Block process call not supported "
+		       "under I2C emulation!\n");
+		return -1;
+	case I2C_SMBUS_I2C_BLOCK_DATA:
+		if (read_write == I2C_SMBUS_READ) {
+			msg[1].len = I2C_SMBUS_I2C_BLOCK_MAX;
+		} else {
+			msg[0].len = data->block[0] + 1;
+			if (msg[0].len > I2C_SMBUS_I2C_BLOCK_MAX + 1) {
+				dev_err(&adapter->dev, "i2c_smbus_xfer_emulated called with "
+				       "invalid block write size (%d)\n",
+				       data->block[0]);
+				return -1;
+			}
+			for (i = 1; i <= data->block[0]; i++)
+				msgbuf0[i] = data->block[i];
+		}
+		break;
+	default:
+		dev_err(&adapter->dev, "smbus_access called with invalid size (%d)\n",
+		       size);
+		return -1;
+	}
+
+	if (i2c_transfer(adapter, msg, num) < 0)
+		return -1;
+
+	if (read_write == I2C_SMBUS_READ)
+		switch(size) {
+			case I2C_SMBUS_BYTE:
+				data->byte = msgbuf0[0];
+				break;
+			case I2C_SMBUS_BYTE_DATA:
+				data->byte = msgbuf1[0];
+				break;
+			case I2C_SMBUS_WORD_DATA: 
+			case I2C_SMBUS_PROC_CALL:
+				data->word = msgbuf1[0] | (msgbuf1[1] << 8);
+				break;
+			case I2C_SMBUS_I2C_BLOCK_DATA:
+				/* fixed at 32 for now */
+				data->block[0] = I2C_SMBUS_I2C_BLOCK_MAX;
+				for (i = 0; i < I2C_SMBUS_I2C_BLOCK_MAX; i++)
+					data->block[i+1] = msgbuf1[i];
+				break;
+		}
+	return 0;
+}
+
+
+s32 i2c_smbus_xfer(struct i2c_adapter * adapter, u16 addr, unsigned short flags,
+                   char read_write, u8 command, int size, 
+                   union i2c_smbus_data * data)
+{
+	s32 res;
+	int swpec = 0;
+	u8 partial = 0;
+
+	flags &= I2C_M_TEN | I2C_CLIENT_PEC;
+	if((flags & I2C_CLIENT_PEC) &&
+	   !(i2c_check_functionality(adapter, I2C_FUNC_SMBUS_HWPEC_CALC))) {
+		swpec = 1;
+		if(read_write == I2C_SMBUS_READ &&
+		   size == I2C_SMBUS_BLOCK_DATA)
+			size = I2C_SMBUS_BLOCK_DATA_PEC;
+		else if(size == I2C_SMBUS_PROC_CALL)
+			size = I2C_SMBUS_PROC_CALL_PEC;
+		else if(size == I2C_SMBUS_BLOCK_PROC_CALL) {
+			i2c_smbus_add_pec(addr, command,
+		                          I2C_SMBUS_BLOCK_DATA, data);
+			partial = data->block[data->block[0] + 1];
+			size = I2C_SMBUS_BLOCK_PROC_CALL_PEC;
+		} else if(read_write == I2C_SMBUS_WRITE &&
+		          size != I2C_SMBUS_QUICK &&
+		          size != I2C_SMBUS_I2C_BLOCK_DATA)
+			size = i2c_smbus_add_pec(addr, command, size, data);
+	}
+
+	if (adapter->algo->smbus_xfer) {
+		down(&adapter->bus_lock);
+		res = adapter->algo->smbus_xfer(adapter,addr,flags,read_write,
+		                                command,size,data);
+		up(&adapter->bus_lock);
+	} else
+		res = i2c_smbus_xfer_emulated(adapter,addr,flags,read_write,
+	                                      command,size,data);
+
+	if(res >= 0 && swpec &&
+	   size != I2C_SMBUS_QUICK && size != I2C_SMBUS_I2C_BLOCK_DATA &&
+	   (read_write == I2C_SMBUS_READ || size == I2C_SMBUS_PROC_CALL_PEC ||
+	    size == I2C_SMBUS_BLOCK_PROC_CALL_PEC)) {
+		if(i2c_smbus_check_pec(addr, command, size, partial, data))
+			return -1;
+	}
+	return res;
+}
+
+
+EXPORT_SYMBOL(i2c_add_adapter);
+EXPORT_SYMBOL(i2c_del_adapter);
+EXPORT_SYMBOL(i2c_add_driver);
+EXPORT_SYMBOL(i2c_del_driver);
+EXPORT_SYMBOL(i2c_attach_client);
+EXPORT_SYMBOL(i2c_detach_client);
+EXPORT_SYMBOL(i2c_use_client);
+EXPORT_SYMBOL(i2c_release_client);
+EXPORT_SYMBOL(i2c_clients_command);
+EXPORT_SYMBOL(i2c_check_addr);
+
+EXPORT_SYMBOL(i2c_master_send);
+EXPORT_SYMBOL(i2c_master_recv);
+EXPORT_SYMBOL(i2c_control);
+EXPORT_SYMBOL(i2c_transfer);
+EXPORT_SYMBOL(i2c_adapter_id);
+EXPORT_SYMBOL(i2c_get_adapter);
+EXPORT_SYMBOL(i2c_put_adapter);
+EXPORT_SYMBOL(i2c_probe);
+
+EXPORT_SYMBOL(i2c_smbus_xfer);
+EXPORT_SYMBOL(i2c_smbus_write_quick);
+EXPORT_SYMBOL(i2c_smbus_read_byte);
+EXPORT_SYMBOL(i2c_smbus_write_byte);
+EXPORT_SYMBOL(i2c_smbus_read_byte_data);
+EXPORT_SYMBOL(i2c_smbus_write_byte_data);
+EXPORT_SYMBOL(i2c_smbus_read_word_data);
+EXPORT_SYMBOL(i2c_smbus_write_word_data);
+EXPORT_SYMBOL(i2c_smbus_write_block_data);
+EXPORT_SYMBOL(i2c_smbus_read_i2c_block_data);
+
+MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
+MODULE_DESCRIPTION("I2C-Bus main module");
+MODULE_LICENSE("GPL");