path: root/drivers/i2c/i2c-core.c

/* 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 Ky�sti M�lkki <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> and
   Jean Delvare <khali@linux-fr.org> */

#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 <linux/platform_device.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>


static LIST_HEAD(adapters);
static LIST_HEAD(drivers);
static DEFINE_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);
	return rc;
}

static int i2c_bus_resume(struct device * dev)
{
	int rc = 0;
	
	if (dev->driver && dev->driver->resume)
		rc = dev->driver->resume(dev);
	return rc;
}

static int i2c_device_probe(struct device *dev)
{
	return -ENODEV;
}

static int i2c_device_remove(struct device *dev)
{
	return 0;
}

struct bus_type i2c_bus_type = {
	.name =		"i2c",
	.match =	i2c_device_match,
	.probe =	i2c_device_probe,
	.remove =	i2c_device_remove,
	.suspend =      i2c_bus_suspend,
	.resume =       i2c_bus_resume,
};

void i2c_adapter_dev_release(struct device *dev)
{
	struct i2c_adapter *adap = dev_to_i2c_adapter(dev);
	complete(&adap->dev_released);
}

struct device_driver i2c_adapter_driver = {
	.owner = THIS_MODULE,
	.name =	"i2c_adapter",
	.bus = &i2c_bus_type,
};

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);
}

struct class i2c_adapter_class = {
	.owner =	THIS_MODULE,
	.name =		"i2c-adapter",
	.release =	&i2c_adapter_class_dev_release,
};

static ssize_t show_adapter_name(struct device *dev, struct device_attribute *attr, 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(