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Kernel driver i2c-ali1563

Supported adapters:
  * Acer Labs, Inc. ALI 1563 (south bridge)
    Datasheet: Now under NDA
	http://www.ali.com.tw/

Author: Patrick Mochel <mochel@digitalimplant.org>

Description
-----------

This is the driver for the SMB Host controller on Acer Labs Inc. (ALI)
M1563 South Bridge.

For an overview of these chips see http://www.acerlabs.com

The M1563 southbridge is deceptively similar to the M1533, with a few
notable exceptions. One of those happens to be the fact they upgraded the
i2c core to be SMBus 2.0 compliant, and happens to be almost identical to
the i2c controller found in the Intel 801 south bridges.

Features
--------

This driver controls the SMB Host only. This driver does not use
interrupts.
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/*
 *	cn_queue.c
 *
 * 2004+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
 * All rights reserved.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/suspend.h>
#include <linux/connector.h>
#include <linux/delay.h>

static struct cn_callback_entry *
cn_queue_alloc_callback_entry(struct cn_queue_dev *dev, const char *name,
			      struct cb_id *id,
			      void (*callback)(struct cn_msg *,
					       struct netlink_skb_parms *))
{
	struct cn_callback_entry *cbq;

	cbq = kzalloc(sizeof(*cbq), GFP_KERNEL);
	if (!cbq) {
		pr_err("Failed to create new callback queue.\n");
		return NULL;
	}

	atomic_set(&cbq->refcnt, 1);

	atomic_inc(&dev->refcnt);
	cbq->pdev = dev;

	snprintf(cbq->id.name, sizeof(cbq->id.name), "%s", name);
	memcpy(&cbq->id.id, id, sizeof(struct cb_id));
	cbq->callback = callback;
	return cbq;
}

void cn_queue_release_callback(struct cn_callback_entry *cbq)
{
	if (!atomic_dec_and_test(&cbq->refcnt))
		return;

	atomic_dec(&cbq->pdev->refcnt);
	kfree(cbq);
}

int cn_cb_equal(struct cb_id *i1, struct cb_id *i2)
{
	return ((i1->idx == i2->idx) && (i1->val == i2->val));
}

int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name,
			  struct cb_id *id,
			  void (*callback)(struct cn_msg *,
					   struct netlink_skb_parms *))
{
	struct cn_callback_entry *cbq, *__cbq;
	int found = 0;

	cbq = cn_queue_alloc_callback_entry(dev, name, id, callback);
	if (!cbq)
		return -ENOMEM;

	spin_lock_bh(&dev->queue_lock);
	list_for_each_entry(__cbq, &dev->queue_list, callback_entry) {
		if (cn_cb_equal(&__cbq->id.id, id)) {
			found = 1;
			break;
		}
	}
	if (!found)
		list_add_tail(&cbq->callback_entry, &dev->queue_list);
	spin_unlock_bh(&dev->queue_lock);

	if (found) {
		cn_queue_release_callback(cbq);
		return -EINVAL;
	}

	cbq->seq = 0;
	cbq->group = cbq->id.id.idx;

	return 0;
}

void cn_queue_del_callback(struct cn_queue_dev *dev, struct cb_id *id)
{
	struct cn_callback_entry *cbq, *n;
	int found = 0;

	spin_lock_bh(&dev->queue_lock);
	list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry) {
		if (cn_cb_equal(&cbq->id.id, id)) {
			list_del(&cbq->callback_entry);
			found = 1;
			break;
		}
	}
	spin_unlock_bh(&dev->queue_lock);

	if (found)
		cn_queue_release_callback(cbq);
}

struct cn_queue_dev *cn_queue_alloc_dev(const char *name, struct sock *nls)
{
	struct cn_queue_dev *dev;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return NULL;

	snprintf(dev->name, sizeof(dev->name), "%s", name);
	atomic_set(&dev->refcnt, 0);
	INIT_LIST_HEAD(&dev->queue_list);
	spin_lock_init(&dev->queue_lock);

	dev->nls = nls;

	return dev;
}

void cn_queue_free_dev(struct cn_queue_dev *dev)
{
	struct cn_callback_entry *cbq, *n;

	spin_lock_bh(&dev->queue_lock);
	list_for_each_entry_safe(cbq, n, &dev->queue_list, callback_entry)
		list_del(&cbq->callback_entry);
	spin_unlock_bh(&dev->queue_lock);

	while (atomic_read(&dev->refcnt)) {
		pr_info("Waiting for %s to become free: refcnt=%d.\n",
		       dev->name, atomic_read(&dev->refcnt));
		msleep(1000);
	}

	kfree(dev);
	dev = NULL;
}