linux-imx

/*

 * A sensor driver for the magnetometer AK8975.

 *

 * Magnetic compass sensor driver for monitoring magnetic flux information.

 *

 * Copyright (c) 2010, NVIDIA Corporation.

 *

 * 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.,

 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 */

​

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/i2c.h>

#include <linux/interrupt.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/delay.h>

#include <linux/bitops.h>

#include <linux/gpio.h>

#include <linux/of_gpio.h>

#include <linux/acpi.h>

#include <linux/regulator/consumer.h>

#include <linux/pm_runtime.h>

​

#include <linux/iio/iio.h>

#include <linux/iio/sysfs.h>

#include <linux/iio/buffer.h>

#include <linux/iio/trigger.h>

#include <linux/iio/trigger_consumer.h>

#include <linux/iio/triggered_buffer.h>

​

#include <linux/iio/magnetometer/ak8975.h>

​

/*

 * Register definitions, as well as various shifts and masks to get at the

 * individual fields of the registers.

 */

#define AK8975_REG_WIA          0x00

#define AK8975_DEVICE_ID        0x48

​

#define AK8975_REG_INFO         0x01

​

#define AK8975_REG_ST1          0x02

#define AK8975_REG_ST1_DRDY_SHIFT   0

#define AK8975_REG_ST1_DRDY_MASK    (1 << AK8975_REG_ST1_DRDY_SHIFT)

​

#define AK8975_REG_HXL          0x03

#define AK8975_REG_HXH          0x04

#define AK8975_REG_HYL          0x05

#define AK8975_REG_HYH          0x06

#define AK8975_REG_HZL          0x07

#define AK8975_REG_HZH          0x08

#define AK8975_REG_ST2          0x09

#define AK8975_REG_ST2_DERR_SHIFT   2

#define AK8975_REG_ST2_DERR_MASK    (1 << AK8975_REG_ST2_DERR_SHIFT)

​

#define AK8975_REG_ST2_HOFL_SHIFT   3

#define AK8975_REG_ST2_HOFL_MASK    (1 << AK8975_REG_ST2_HOFL_SHIFT)

​

#define AK8975_REG_CNTL         0x0A

#define AK8975_REG_CNTL_MODE_SHIFT  0

#define AK8975_REG_CNTL_MODE_MASK   (0xF << AK8975_REG_CNTL_MODE_SHIFT)

#define AK8975_REG_CNTL_MODE_POWER_DOWN 0x00

#define AK8975_REG_CNTL_MODE_ONCE   0x01

#define AK8975_REG_CNTL_MODE_SELF_TEST  0x08

#define AK8975_REG_CNTL_MODE_FUSE_ROM   0x0F

​

#define AK8975_REG_RSVC         0x0B

#define AK8975_REG_ASTC         0x0C

#define AK8975_REG_TS1          0x0D

#define AK8975_REG_TS2          0x0E

#define AK8975_REG_I2CDIS       0x0F

#define AK8975_REG_ASAX         0x10

#define AK8975_REG_ASAY         0x11

#define AK8975_REG_ASAZ         0x12

​

#define AK8975_MAX_REGS         AK8975_REG_ASAZ

​

/*