linux-imx

/*

 * Driver for the Asahi Kasei EMD Corporation AK8974

 * and Aichi Steel AMI305 magnetometer chips.

 * Based on a patch from Samu Onkalo and the AK8975 IIO driver.

 *

 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

 * Copyright (c) 2010 NVIDIA Corporation.

 * Copyright (C) 2016 Linaro Ltd.

 *

 * Author: Samu Onkalo <samu.p.onkalo@nokia.com>

 * Author: Linus Walleij <linus.walleij@linaro.org>

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/i2c.h>

#include <linux/interrupt.h>

#include <linux/irq.h> /* For irq_get_irq_data() */

#include <linux/completion.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/delay.h>

#include <linux/bitops.h>

#include <linux/random.h>

#include <linux/regmap.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>

​

/*

 * 16-bit registers are little-endian. LSB is at the address defined below

 * and MSB is at the next higher address.

 */

​

/* These registers are common for AK8974 and AMI30x */

#define AK8974_SELFTEST     0x0C

#define AK8974_SELFTEST_IDLE    0x55

#define AK8974_SELFTEST_OK  0xAA

​

#define AK8974_INFO     0x0D

​

#define AK8974_WHOAMI       0x0F

#define AK8974_WHOAMI_VALUE_AMI306 0x46

#define AK8974_WHOAMI_VALUE_AMI305 0x47

#define AK8974_WHOAMI_VALUE_AK8974 0x48

​

#define AK8974_DATA_X       0x10

#define AK8974_DATA_Y       0x12

#define AK8974_DATA_Z       0x14

#define AK8974_INT_SRC      0x16

#define AK8974_STATUS       0x18

#define AK8974_INT_CLEAR    0x1A

#define AK8974_CTRL1        0x1B

#define AK8974_CTRL2        0x1C

#define AK8974_CTRL3        0x1D

#define AK8974_INT_CTRL     0x1E

#define AK8974_INT_THRES    0x26  /* Absolute any axis value threshold */

#define AK8974_PRESET       0x30