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linux-sg2042/drivers/iio/magnetometer/ak8974.c

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/*
* 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/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 AMI305 */
#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_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
/* AK8974-specific offsets */
#define AK8974_OFFSET_X 0x20
#define AK8974_OFFSET_Y 0x22
#define AK8974_OFFSET_Z 0x24
/* AMI305-specific offsets */
#define AMI305_OFFSET_X 0x6C
#define AMI305_OFFSET_Y 0x72
#define AMI305_OFFSET_Z 0x78
/* Different temperature registers */
#define AK8974_TEMP 0x31
#define AMI305_TEMP 0x60
#define AK8974_INT_X_HIGH BIT(7) /* Axis over +threshold */
#define AK8974_INT_Y_HIGH BIT(6)
#define AK8974_INT_Z_HIGH BIT(5)
#define AK8974_INT_X_LOW BIT(4) /* Axis below -threshold */
#define AK8974_INT_Y_LOW BIT(3)
#define AK8974_INT_Z_LOW BIT(2)
#define AK8974_INT_RANGE BIT(1) /* Range overflow (any axis) */
#define AK8974_STATUS_DRDY BIT(6) /* Data ready */
#define AK8974_STATUS_OVERRUN BIT(5) /* Data overrun */
#define AK8974_STATUS_INT BIT(4) /* Interrupt occurred */
#define AK8974_CTRL1_POWER BIT(7) /* 0 = standby; 1 = active */
#define AK8974_CTRL1_RATE BIT(4) /* 0 = 10 Hz; 1 = 20 Hz */
#define AK8974_CTRL1_FORCE_EN BIT(1) /* 0 = normal; 1 = force */
#define AK8974_CTRL1_MODE2 BIT(0) /* 0 */
#define AK8974_CTRL2_INT_EN BIT(4) /* 1 = enable interrupts */
#define AK8974_CTRL2_DRDY_EN BIT(3) /* 1 = enable data ready signal */
#define AK8974_CTRL2_DRDY_POL BIT(2) /* 1 = data ready active high */
#define AK8974_CTRL2_RESDEF (AK8974_CTRL2_DRDY_POL)
#define AK8974_CTRL3_RESET BIT(7) /* Software reset */
#define AK8974_CTRL3_FORCE BIT(6) /* Start forced measurement */
#define AK8974_CTRL3_SELFTEST BIT(4) /* Set selftest register */
#define AK8974_CTRL3_RESDEF 0x00
#define AK8974_INT_CTRL_XEN BIT(7) /* Enable interrupt for this axis */
#define AK8974_INT_CTRL_YEN BIT(6)
#define AK8974_INT_CTRL_ZEN BIT(5)
#define AK8974_INT_CTRL_XYZEN (BIT(7)|BIT(6)|BIT(5))
#define AK8974_INT_CTRL_POL BIT(3) /* 0 = active low; 1 = active high */
#define AK8974_INT_CTRL_PULSE BIT(1) /* 0 = latched; 1 = pulse (50 usec) */
#define AK8974_INT_CTRL_RESDEF (AK8974_INT_CTRL_XYZEN | AK8974_INT_CTRL_POL)
/* The AMI305 has elaborate FW version and serial number registers */
#define AMI305_VER 0xE8
#define AMI305_SN 0xEA
#define AK8974_MAX_RANGE 2048
#define AK8974_POWERON_DELAY 50
#define AK8974_ACTIVATE_DELAY 1
#define AK8974_SELFTEST_DELAY 1
/*
* Set the autosuspend to two orders of magnitude larger than the poweron
* delay to make sane reasonable power tradeoff savings (5 seconds in
* this case).
*/
#define AK8974_AUTOSUSPEND_DELAY 5000
#define AK8974_MEASTIME 3
#define AK8974_PWR_ON 1
#define AK8974_PWR_OFF 0
/**
* struct ak8974 - state container for the AK8974 driver
* @i2c: parent I2C client
* @orientation: mounting matrix, flipped axis etc
* @map: regmap to access the AK8974 registers over I2C
* @regs: the avdd and dvdd power regulators
* @name: the name of the part
* @variant: the whoami ID value (for selecting code paths)
* @lock: locks the magnetometer for exclusive use during a measurement
* @drdy_irq: uses the DRDY IRQ line
* @drdy_complete: completion for DRDY
* @drdy_active_low: the DRDY IRQ is active low
*/
struct ak8974 {
struct i2c_client *i2c;
struct iio_mount_matrix orientation;
struct regmap *map;
struct regulator_bulk_data regs[2];
const char *name;
u8 variant;
struct mutex lock;
bool drdy_irq;
struct completion drdy_complete;
bool drdy_active_low;
};
static const char ak8974_reg_avdd[] = "avdd";
static const char ak8974_reg_dvdd[] = "dvdd";
static int ak8974_set_power(struct ak8974 *ak8974, bool mode)
{
int ret;
u8 val;
val = mode ? AK8974_CTRL1_POWER : 0;
val |= AK8974_CTRL1_FORCE_EN;
ret = regmap_write(ak8974->map, AK8974_CTRL1, val);
if (ret < 0)
return ret;
if (mode)
msleep(AK8974_ACTIVATE_DELAY);
return 0;
}
static int ak8974_reset(struct ak8974 *ak8974)
{
int ret;
/* Power on to get register access. Sets CTRL1 reg to reset state */
ret = ak8974_set_power(ak8974, AK8974_PWR_ON);
if (ret)
return ret;
ret = regmap_write(ak8974->map, AK8974_CTRL2, AK8974_CTRL2_RESDEF);
if (ret)
return ret;
ret = regmap_write(ak8974->map, AK8974_CTRL3, AK8974_CTRL3_RESDEF);
if (ret)
return ret;
ret = regmap_write(ak8974->map, AK8974_INT_CTRL,
AK8974_INT_CTRL_RESDEF);
if (ret)
return ret;
/* After reset, power off is default state */
return ak8974_set_power(ak8974, AK8974_PWR_OFF);
}
static int ak8974_configure(struct ak8974 *ak8974)
{
int ret;
ret = regmap_write(ak8974->map, AK8974_CTRL2, AK8974_CTRL2_DRDY_EN |
AK8974_CTRL2_INT_EN);
if (ret)
return ret;
ret = regmap_write(ak8974->map, AK8974_CTRL3, 0);
if (ret)
return ret;
ret = regmap_write(ak8974->map, AK8974_INT_CTRL, AK8974_INT_CTRL_POL);
if (ret)
return ret;
return regmap_write(ak8974->map, AK8974_PRESET, 0);
}
static int ak8974_trigmeas(struct ak8974 *ak8974)
{
unsigned int clear;
u8 mask;
u8 val;
int ret;
/* Clear any previous measurement overflow status */
ret = regmap_read(ak8974->map, AK8974_INT_CLEAR, &clear);
if (ret)
return ret;
/* If we have a DRDY IRQ line, use it */
if (ak8974->drdy_irq) {
mask = AK8974_CTRL2_INT_EN |
AK8974_CTRL2_DRDY_EN |
AK8974_CTRL2_DRDY_POL;
val = AK8974_CTRL2_DRDY_EN;
if (!ak8974->drdy_active_low)
val |= AK8974_CTRL2_DRDY_POL;
init_completion(&ak8974->drdy_complete);
ret = regmap_update_bits(ak8974->map, AK8974_CTRL2,
mask, val);
if (ret)
return ret;
}
/* Force a measurement */
return regmap_update_bits(ak8974->map,
AK8974_CTRL3,
AK8974_CTRL3_FORCE,
AK8974_CTRL3_FORCE);
}
static int ak8974_await_drdy(struct ak8974 *ak8974)
{
int timeout = 2;
unsigned int val;
int ret;
if (ak8974->drdy_irq) {
ret = wait_for_completion_timeout(&ak8974->drdy_complete,
1 + msecs_to_jiffies(1000));
if (!ret) {
dev_err(&ak8974->i2c->dev,
"timeout waiting for DRDY IRQ\n");
return -ETIMEDOUT;
}
return 0;
}
/* Default delay-based poll loop */
do {
msleep(AK8974_MEASTIME);
ret = regmap_read(ak8974->map, AK8974_STATUS, &val);
if (ret < 0)
return ret;
if (val & AK8974_STATUS_DRDY)
return 0;
} while (--timeout);
dev_err(&ak8974->i2c->dev, "timeout waiting for DRDY\n");
return -ETIMEDOUT;
}
static int ak8974_getresult(struct ak8974 *ak8974, __le16 *result)
{
unsigned int src;
int ret;
ret = ak8974_await_drdy(ak8974);
if (ret)
return ret;
ret = regmap_read(ak8974->map, AK8974_INT_SRC, &src);
if (ret < 0)
return ret;
/* Out of range overflow! Strong magnet close? */
if (src & AK8974_INT_RANGE) {
dev_err(&ak8974->i2c->dev,
"range overflow in sensor\n");
return -ERANGE;
}
ret = regmap_bulk_read(ak8974->map, AK8974_DATA_X, result, 6);
if (ret)
return ret;
return ret;
}
static irqreturn_t ak8974_drdy_irq(int irq, void *d)
{
struct ak8974 *ak8974 = d;
if (!ak8974->drdy_irq)
return IRQ_NONE;
/* TODO: timestamp here to get good measurement stamps */
return IRQ_WAKE_THREAD;
}
static irqreturn_t ak8974_drdy_irq_thread(int irq, void *d)
{
struct ak8974 *ak8974 = d;
unsigned int val;
int ret;
/* Check if this was a DRDY from us */
ret = regmap_read(ak8974->map, AK8974_STATUS, &val);
if (ret < 0) {
dev_err(&ak8974->i2c->dev, "error reading DRDY status\n");
return IRQ_HANDLED;
}
if (val & AK8974_STATUS_DRDY) {
/* Yes this was our IRQ */
complete(&ak8974->drdy_complete);
return IRQ_HANDLED;
}
/* We may be on a shared IRQ, let the next client check */
return IRQ_NONE;
}
static int ak8974_selftest(struct ak8974 *ak8974)
{
struct device *dev = &ak8974->i2c->dev;
unsigned int val;
int ret;
ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val);
if (ret)
return ret;
if (val != AK8974_SELFTEST_IDLE) {
dev_err(dev, "selftest not idle before test\n");
return -EIO;
}
/* Trigger self-test */
ret = regmap_update_bits(ak8974->map,
AK8974_CTRL3,
AK8974_CTRL3_SELFTEST,
AK8974_CTRL3_SELFTEST);
if (ret) {
dev_err(dev, "could not write CTRL3\n");
return ret;
}
msleep(AK8974_SELFTEST_DELAY);
ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val);
if (ret)
return ret;
if (val != AK8974_SELFTEST_OK) {
dev_err(dev, "selftest result NOT OK (%02x)\n", val);
return -EIO;
}
ret = regmap_read(ak8974->map, AK8974_SELFTEST, &val);
if (ret)
return ret;
if (val != AK8974_SELFTEST_IDLE) {
dev_err(dev, "selftest not idle after test (%02x)\n", val);
return -EIO;
}
dev_dbg(dev, "passed self-test\n");
return 0;
}
static int ak8974_get_u16_val(struct ak8974 *ak8974, u8 reg, u16 *val)
{
int ret;
__le16 bulk;
ret = regmap_bulk_read(ak8974->map, reg, &bulk, 2);
if (ret)
return ret;
*val = le16_to_cpu(bulk);
return 0;
}
static int ak8974_detect(struct ak8974 *ak8974)
{
unsigned int whoami;
const char *name;
int ret;
unsigned int fw;
u16 sn;
ret = regmap_read(ak8974->map, AK8974_WHOAMI, &whoami);
if (ret)
return ret;
switch (whoami) {
case AK8974_WHOAMI_VALUE_AMI305:
name = "ami305";
ret = regmap_read(ak8974->map, AMI305_VER, &fw);
if (ret)
return ret;
fw &= 0x7f; /* only bits 0 thru 6 valid */
ret = ak8974_get_u16_val(ak8974, AMI305_SN, &sn);
if (ret)
return ret;
dev_info(&ak8974->i2c->dev,
"detected %s, FW ver %02x, S/N: %04x\n",
name, fw, sn);
break;
case AK8974_WHOAMI_VALUE_AK8974:
name = "ak8974";
dev_info(&ak8974->i2c->dev, "detected AK8974\n");
break;
default:
dev_err(&ak8974->i2c->dev, "unsupported device (%02x) ",
whoami);
return -ENODEV;
}
ak8974->name = name;
ak8974->variant = whoami;
return 0;
}
static int ak8974_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2,
long mask)
{
struct ak8974 *ak8974 = iio_priv(indio_dev);
__le16 hw_values[3];
int ret = -EINVAL;
pm_runtime_get_sync(&ak8974->i2c->dev);
mutex_lock(&ak8974->lock);
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (chan->address > 2) {
dev_err(&ak8974->i2c->dev, "faulty channel address\n");
ret = -EIO;
goto out_unlock;
}
ret = ak8974_trigmeas(ak8974);
if (ret)
goto out_unlock;
ret = ak8974_getresult(ak8974, hw_values);
if (ret)
goto out_unlock;
/*
* We read all axes and discard all but one, for optimized
* reading, use the triggered buffer.
*/
*val = le16_to_cpu(hw_values[chan->address]);
ret = IIO_VAL_INT;
}
out_unlock:
mutex_unlock(&ak8974->lock);
pm_runtime_mark_last_busy(&ak8974->i2c->dev);
pm_runtime_put_autosuspend(&ak8974->i2c->dev);
return ret;
}
static void ak8974_fill_buffer(struct iio_dev *indio_dev)
{
struct ak8974 *ak8974 = iio_priv(indio_dev);
int ret;
__le16 hw_values[8]; /* Three axes + 64bit padding */
pm_runtime_get_sync(&ak8974->i2c->dev);
mutex_lock(&ak8974->lock);
ret = ak8974_trigmeas(ak8974);
if (ret) {
dev_err(&ak8974->i2c->dev, "error triggering measure\n");
goto out_unlock;
}
ret = ak8974_getresult(ak8974, hw_values);
if (ret) {
dev_err(&ak8974->i2c->dev, "error getting measures\n");
goto out_unlock;
}
iio_push_to_buffers_with_timestamp(indio_dev, hw_values,
iio_get_time_ns(indio_dev));
out_unlock:
mutex_unlock(&ak8974->lock);
pm_runtime_mark_last_busy(&ak8974->i2c->dev);
pm_runtime_put_autosuspend(&ak8974->i2c->dev);
}
static irqreturn_t ak8974_handle_trigger(int irq, void *p)
{
const struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
ak8974_fill_buffer(indio_dev);
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static const struct iio_mount_matrix *
ak8974_get_mount_matrix(const struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct ak8974 *ak8974 = iio_priv(indio_dev);
return &ak8974->orientation;
}
static const struct iio_chan_spec_ext_info ak8974_ext_info[] = {
IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, ak8974_get_mount_matrix),
{ },
};
#define AK8974_AXIS_CHANNEL(axis, index) \
{ \
.type = IIO_MAGN, \
.modified = 1, \
.channel2 = IIO_MOD_##axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.ext_info = ak8974_ext_info, \
.address = index, \
.scan_index = index, \
.scan_type = { \
.sign = 's', \
.realbits = 16, \
.storagebits = 16, \
.endianness = IIO_LE \
}, \
}
static const struct iio_chan_spec ak8974_channels[] = {
AK8974_AXIS_CHANNEL(X, 0),
AK8974_AXIS_CHANNEL(Y, 1),
AK8974_AXIS_CHANNEL(Z, 2),
IIO_CHAN_SOFT_TIMESTAMP(3),
};
static const unsigned long ak8974_scan_masks[] = { 0x7, 0 };
static const struct iio_info ak8974_info = {
.read_raw = &ak8974_read_raw,
.driver_module = THIS_MODULE,
};
static bool ak8974_writeable_reg(struct device *dev, unsigned int reg)
{
struct i2c_client *i2c = to_i2c_client(dev);
struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
struct ak8974 *ak8974 = iio_priv(indio_dev);
switch (reg) {
case AK8974_CTRL1:
case AK8974_CTRL2:
case AK8974_CTRL3:
case AK8974_INT_CTRL:
case AK8974_INT_THRES:
case AK8974_INT_THRES + 1:
case AK8974_PRESET:
case AK8974_PRESET + 1:
return true;
case AK8974_OFFSET_X:
case AK8974_OFFSET_X + 1:
case AK8974_OFFSET_Y:
case AK8974_OFFSET_Y + 1:
case AK8974_OFFSET_Z:
case AK8974_OFFSET_Z + 1:
if (ak8974->variant == AK8974_WHOAMI_VALUE_AK8974)
return true;
return false;
case AMI305_OFFSET_X:
case AMI305_OFFSET_X + 1:
case AMI305_OFFSET_Y:
case AMI305_OFFSET_Y + 1:
case AMI305_OFFSET_Z:
case AMI305_OFFSET_Z + 1:
if (ak8974->variant == AK8974_WHOAMI_VALUE_AMI305)
return true;
return false;
default:
return false;
}
}
static const struct regmap_config ak8974_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = 0xff,
.writeable_reg = ak8974_writeable_reg,
};
static int ak8974_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct iio_dev *indio_dev;
struct ak8974 *ak8974;
unsigned long irq_trig;
int irq = i2c->irq;
int ret;
/* Register with IIO */
indio_dev = devm_iio_device_alloc(&i2c->dev, sizeof(*ak8974));
if (indio_dev == NULL)
return -ENOMEM;
ak8974 = iio_priv(indio_dev);
i2c_set_clientdata(i2c, indio_dev);
ak8974->i2c = i2c;
mutex_init(&ak8974->lock);
ret = of_iio_read_mount_matrix(&i2c->dev,
"mount-matrix",
&ak8974->orientation);
if (ret)
return ret;
ak8974->regs[0].supply = ak8974_reg_avdd;
ak8974->regs[1].supply = ak8974_reg_dvdd;
ret = devm_regulator_bulk_get(&i2c->dev,
ARRAY_SIZE(ak8974->regs),
ak8974->regs);
if (ret < 0) {
dev_err(&i2c->dev, "cannot get regulators\n");
return ret;
}
ret = regulator_bulk_enable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
if (ret < 0) {
dev_err(&i2c->dev, "cannot enable regulators\n");
return ret;
}
/* Take runtime PM online */
pm_runtime_get_noresume(&i2c->dev);
pm_runtime_set_active(&i2c->dev);
pm_runtime_enable(&i2c->dev);
ak8974->map = devm_regmap_init_i2c(i2c, &ak8974_regmap_config);
if (IS_ERR(ak8974->map)) {
dev_err(&i2c->dev, "failed to allocate register map\n");
return PTR_ERR(ak8974->map);
}
ret = ak8974_set_power(ak8974, AK8974_PWR_ON);
if (ret) {
dev_err(&i2c->dev, "could not power on\n");
goto power_off;
}
ret = ak8974_detect(ak8974);
if (ret) {
dev_err(&i2c->dev, "neither AK8974 nor AMI305 found\n");
goto power_off;
}
ret = ak8974_selftest(ak8974);
if (ret)
dev_err(&i2c->dev, "selftest failed (continuing anyway)\n");
ret = ak8974_reset(ak8974);
if (ret) {
dev_err(&i2c->dev, "AK8974 reset failed\n");
goto power_off;
}
pm_runtime_set_autosuspend_delay(&i2c->dev,
AK8974_AUTOSUSPEND_DELAY);
pm_runtime_use_autosuspend(&i2c->dev);
pm_runtime_put(&i2c->dev);
indio_dev->dev.parent = &i2c->dev;
indio_dev->channels = ak8974_channels;
indio_dev->num_channels = ARRAY_SIZE(ak8974_channels);
indio_dev->info = &ak8974_info;
indio_dev->available_scan_masks = ak8974_scan_masks;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->name = ak8974->name;
ret = iio_triggered_buffer_setup(indio_dev, NULL,
ak8974_handle_trigger,
NULL);
if (ret) {
dev_err(&i2c->dev, "triggered buffer setup failed\n");
goto disable_pm;
}
/* If we have a valid DRDY IRQ, make use of it */
if (irq > 0) {
irq_trig = irqd_get_trigger_type(irq_get_irq_data(irq));
if (irq_trig == IRQF_TRIGGER_RISING) {
dev_info(&i2c->dev, "enable rising edge DRDY IRQ\n");
} else if (irq_trig == IRQF_TRIGGER_FALLING) {
ak8974->drdy_active_low = true;
dev_info(&i2c->dev, "enable falling edge DRDY IRQ\n");
} else {
irq_trig = IRQF_TRIGGER_RISING;
}
irq_trig |= IRQF_ONESHOT;
irq_trig |= IRQF_SHARED;
ret = devm_request_threaded_irq(&i2c->dev,
irq,
ak8974_drdy_irq,
ak8974_drdy_irq_thread,
irq_trig,
ak8974->name,
ak8974);
if (ret) {
dev_err(&i2c->dev, "unable to request DRDY IRQ "
"- proceeding without IRQ\n");
goto no_irq;
}
ak8974->drdy_irq = true;
}
no_irq:
ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&i2c->dev, "device register failed\n");
goto cleanup_buffer;
}
return 0;
cleanup_buffer:
iio_triggered_buffer_cleanup(indio_dev);
disable_pm:
pm_runtime_put_noidle(&i2c->dev);
pm_runtime_disable(&i2c->dev);
ak8974_set_power(ak8974, AK8974_PWR_OFF);
power_off:
regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
return ret;
}
static int ak8974_remove(struct i2c_client *i2c)
{
struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
struct ak8974 *ak8974 = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
pm_runtime_get_sync(&i2c->dev);
pm_runtime_put_noidle(&i2c->dev);
pm_runtime_disable(&i2c->dev);
ak8974_set_power(ak8974, AK8974_PWR_OFF);
regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
return 0;
}
static int __maybe_unused ak8974_runtime_suspend(struct device *dev)
{
struct ak8974 *ak8974 =
iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
ak8974_set_power(ak8974, AK8974_PWR_OFF);
regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
return 0;
}
static int __maybe_unused ak8974_runtime_resume(struct device *dev)
{
struct ak8974 *ak8974 =
iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
if (ret)
return ret;
msleep(AK8974_POWERON_DELAY);
ret = ak8974_set_power(ak8974, AK8974_PWR_ON);
if (ret)
goto out_regulator_disable;
ret = ak8974_configure(ak8974);
if (ret)
goto out_disable_power;
return 0;
out_disable_power:
ak8974_set_power(ak8974, AK8974_PWR_OFF);
out_regulator_disable:
regulator_bulk_disable(ARRAY_SIZE(ak8974->regs), ak8974->regs);
return ret;
}
static const struct dev_pm_ops ak8974_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(ak8974_runtime_suspend,
ak8974_runtime_resume, NULL)
};
static const struct i2c_device_id ak8974_id[] = {
{"ami305", 0 },
{"ak8974", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, ak8974_id);
static const struct of_device_id ak8974_of_match[] = {
{ .compatible = "asahi-kasei,ak8974", },
{}
};
MODULE_DEVICE_TABLE(of, ak8974_of_match);
static struct i2c_driver ak8974_driver = {
.driver = {
.name = "ak8974",
.pm = &ak8974_dev_pm_ops,
.of_match_table = of_match_ptr(ak8974_of_match),
},
.probe = ak8974_probe,
.remove = ak8974_remove,
.id_table = ak8974_id,
};
module_i2c_driver(ak8974_driver);
MODULE_DESCRIPTION("AK8974 and AMI305 3-axis magnetometer driver");
MODULE_AUTHOR("Samu Onkalo");
MODULE_AUTHOR("Linus Walleij");
MODULE_LICENSE("GPL v2");
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