282 строки
6.5 KiB
C
282 строки
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/**
|
|
* Freescale MMA7660FC 3-Axis Accelerometer
|
|
*
|
|
* Copyright (c) 2016, Intel Corporation.
|
|
*
|
|
* IIO driver for Freescale MMA7660FC; 7-bit I2C address: 0x4c.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/module.h>
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/sysfs.h>
|
|
|
|
#define MMA7660_DRIVER_NAME "mma7660"
|
|
|
|
#define MMA7660_REG_XOUT 0x00
|
|
#define MMA7660_REG_YOUT 0x01
|
|
#define MMA7660_REG_ZOUT 0x02
|
|
#define MMA7660_REG_OUT_BIT_ALERT BIT(6)
|
|
|
|
#define MMA7660_REG_MODE 0x07
|
|
#define MMA7660_REG_MODE_BIT_MODE BIT(0)
|
|
#define MMA7660_REG_MODE_BIT_TON BIT(2)
|
|
|
|
#define MMA7660_I2C_READ_RETRIES 5
|
|
|
|
/*
|
|
* The accelerometer has one measurement range:
|
|
*
|
|
* -1.5g - +1.5g (6-bit, signed)
|
|
*
|
|
* scale = (1.5 + 1.5) * 9.81 / (2^6 - 1) = 0.467142857
|
|
*/
|
|
|
|
#define MMA7660_SCALE_AVAIL "0.467142857"
|
|
|
|
static const int mma7660_nscale = 467142857;
|
|
|
|
#define MMA7660_CHANNEL(reg, axis) { \
|
|
.type = IIO_ACCEL, \
|
|
.address = reg, \
|
|
.modified = 1, \
|
|
.channel2 = IIO_MOD_##axis, \
|
|
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
|
|
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
|
|
}
|
|
|
|
static const struct iio_chan_spec mma7660_channels[] = {
|
|
MMA7660_CHANNEL(MMA7660_REG_XOUT, X),
|
|
MMA7660_CHANNEL(MMA7660_REG_YOUT, Y),
|
|
MMA7660_CHANNEL(MMA7660_REG_ZOUT, Z),
|
|
};
|
|
|
|
enum mma7660_mode {
|
|
MMA7660_MODE_STANDBY,
|
|
MMA7660_MODE_ACTIVE
|
|
};
|
|
|
|
struct mma7660_data {
|
|
struct i2c_client *client;
|
|
struct mutex lock;
|
|
enum mma7660_mode mode;
|
|
};
|
|
|
|
static IIO_CONST_ATTR(in_accel_scale_available, MMA7660_SCALE_AVAIL);
|
|
|
|
static struct attribute *mma7660_attributes[] = {
|
|
&iio_const_attr_in_accel_scale_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group mma7660_attribute_group = {
|
|
.attrs = mma7660_attributes
|
|
};
|
|
|
|
static int mma7660_set_mode(struct mma7660_data *data,
|
|
enum mma7660_mode mode)
|
|
{
|
|
int ret;
|
|
struct i2c_client *client = data->client;
|
|
|
|
if (mode == data->mode)
|
|
return 0;
|
|
|
|
ret = i2c_smbus_read_byte_data(client, MMA7660_REG_MODE);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "failed to read sensor mode\n");
|
|
return ret;
|
|
}
|
|
|
|
if (mode == MMA7660_MODE_ACTIVE) {
|
|
ret &= ~MMA7660_REG_MODE_BIT_TON;
|
|
ret |= MMA7660_REG_MODE_BIT_MODE;
|
|
} else {
|
|
ret &= ~MMA7660_REG_MODE_BIT_TON;
|
|
ret &= ~MMA7660_REG_MODE_BIT_MODE;
|
|
}
|
|
|
|
ret = i2c_smbus_write_byte_data(client, MMA7660_REG_MODE, ret);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "failed to change sensor mode\n");
|
|
return ret;
|
|
}
|
|
|
|
data->mode = mode;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mma7660_read_accel(struct mma7660_data *data, u8 address)
|
|
{
|
|
int ret, retries = MMA7660_I2C_READ_RETRIES;
|
|
struct i2c_client *client = data->client;
|
|
|
|
/*
|
|
* Read data. If the Alert bit is set, the register was read at
|
|
* the same time as the device was attempting to update the content.
|
|
* The solution is to read the register again. Do this only
|
|
* MMA7660_I2C_READ_RETRIES times to avoid spending too much time
|
|
* in the kernel.
|
|
*/
|
|
do {
|
|
ret = i2c_smbus_read_byte_data(client, address);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "register read failed\n");
|
|
return ret;
|
|
}
|
|
} while (retries-- > 0 && ret & MMA7660_REG_OUT_BIT_ALERT);
|
|
|
|
if (ret & MMA7660_REG_OUT_BIT_ALERT) {
|
|
dev_err(&client->dev, "all register read retries failed\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mma7660_read_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int *val, int *val2, long mask)
|
|
{
|
|
struct mma7660_data *data = iio_priv(indio_dev);
|
|
int ret;
|
|
|
|
switch (mask) {
|
|
case IIO_CHAN_INFO_RAW:
|
|
mutex_lock(&data->lock);
|
|
ret = mma7660_read_accel(data, chan->address);
|
|
mutex_unlock(&data->lock);
|
|
if (ret < 0)
|
|
return ret;
|
|
*val = sign_extend32(ret, 5);
|
|
return IIO_VAL_INT;
|
|
case IIO_CHAN_INFO_SCALE:
|
|
*val = 0;
|
|
*val2 = mma7660_nscale;
|
|
return IIO_VAL_INT_PLUS_NANO;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct iio_info mma7660_info = {
|
|
.read_raw = mma7660_read_raw,
|
|
.attrs = &mma7660_attribute_group,
|
|
};
|
|
|
|
static int mma7660_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int ret;
|
|
struct iio_dev *indio_dev;
|
|
struct mma7660_data *data;
|
|
|
|
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
|
|
if (!indio_dev) {
|
|
dev_err(&client->dev, "iio allocation failed!\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
data = iio_priv(indio_dev);
|
|
data->client = client;
|
|
i2c_set_clientdata(client, indio_dev);
|
|
mutex_init(&data->lock);
|
|
data->mode = MMA7660_MODE_STANDBY;
|
|
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->info = &mma7660_info;
|
|
indio_dev->name = MMA7660_DRIVER_NAME;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = mma7660_channels;
|
|
indio_dev->num_channels = ARRAY_SIZE(mma7660_channels);
|
|
|
|
ret = mma7660_set_mode(data, MMA7660_MODE_ACTIVE);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "device_register failed\n");
|
|
mma7660_set_mode(data, MMA7660_MODE_STANDBY);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mma7660_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
return mma7660_set_mode(iio_priv(indio_dev), MMA7660_MODE_STANDBY);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int mma7660_suspend(struct device *dev)
|
|
{
|
|
struct mma7660_data *data;
|
|
|
|
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
|
|
|
|
return mma7660_set_mode(data, MMA7660_MODE_STANDBY);
|
|
}
|
|
|
|
static int mma7660_resume(struct device *dev)
|
|
{
|
|
struct mma7660_data *data;
|
|
|
|
data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
|
|
|
|
return mma7660_set_mode(data, MMA7660_MODE_ACTIVE);
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(mma7660_pm_ops, mma7660_suspend, mma7660_resume);
|
|
|
|
#define MMA7660_PM_OPS (&mma7660_pm_ops)
|
|
#else
|
|
#define MMA7660_PM_OPS NULL
|
|
#endif
|
|
|
|
static const struct i2c_device_id mma7660_i2c_id[] = {
|
|
{"mma7660", 0},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, mma7660_i2c_id);
|
|
|
|
static const struct of_device_id mma7660_of_match[] = {
|
|
{ .compatible = "fsl,mma7660" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, mma7660_of_match);
|
|
|
|
static const struct acpi_device_id mma7660_acpi_id[] = {
|
|
{"MMA7660", 0},
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(acpi, mma7660_acpi_id);
|
|
|
|
static struct i2c_driver mma7660_driver = {
|
|
.driver = {
|
|
.name = "mma7660",
|
|
.pm = MMA7660_PM_OPS,
|
|
.of_match_table = mma7660_of_match,
|
|
.acpi_match_table = ACPI_PTR(mma7660_acpi_id),
|
|
},
|
|
.probe = mma7660_probe,
|
|
.remove = mma7660_remove,
|
|
.id_table = mma7660_i2c_id,
|
|
};
|
|
|
|
module_i2c_driver(mma7660_driver);
|
|
|
|
MODULE_AUTHOR("Constantin Musca <constantin.musca@intel.com>");
|
|
MODULE_DESCRIPTION("Freescale MMA7660FC 3-Axis Accelerometer driver");
|
|
MODULE_LICENSE("GPL v2");
|