/*
 * hmc6352.c - Honeywell Compass Driver
 *
 * Copyright (C) 2009 Intel Corp
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * 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 <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/sysfs.h>

static DEFINE_MUTEX(compass_mutex);

static int compass_command(struct i2c_client *c, u8 cmd)
{
	int ret = i2c_master_send(c, &cmd, 1);
	if (ret < 0)
		dev_warn(&c->dev, "command '%c' failed.\n", cmd);
	return ret;
}

static int compass_store(struct device *dev, const char *buf, size_t count,
			const char *map)
{
	struct i2c_client *c = to_i2c_client(dev);
	int ret;
	unsigned long val;

	ret = kstrtoul(buf, 10, &val);
	if (ret)
		return ret;
	if (val >= strlen(map))
		return -EINVAL;
	mutex_lock(&compass_mutex);
	ret = compass_command(c, map[val]);