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// SPDX-License-Identifier: GPL-2.0-only
/*
* IIO driver for the MiraMEMS DA217 and DA280 3-axis accelerometer and
* IIO driver for the MiraMEMS DA226 2-axis accelerometer
*
* Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/byteorder/generic.h>
#define DA280_REG_CHIP_ID 0x01
#define DA280_REG_ACC_X_LSB 0x02
#define DA280_REG_ACC_Y_LSB 0x04
#define DA280_REG_ACC_Z_LSB 0x06
#define DA280_REG_MODE_BW 0x11
#define DA280_CHIP_ID 0x13
#define DA280_MODE_ENABLE 0x1e
#define DA280_MODE_DISABLE 0x9e
/*
* a value of + or -4096 corresponds to + or - 1G
* scale = 9.81 / 4096 = 0.002395019
*/
static const int da280_nscale = 2395019;
#define DA280_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 da280_channels[] = {
DA280_CHANNEL(DA280_REG_ACC_X_LSB, X),
DA280_CHANNEL(DA280_REG_ACC_Y_LSB, Y),
DA280_CHANNEL(DA280_REG_ACC_Z_LSB, Z),
};
struct da280_match_data {
const char *name;
int num_channels;
};
struct da280_data {
struct i2c_client *client;
};
static int da280_enable(struct i2c_client *client, bool enable)
{
u8 data = enable ? DA280_MODE_ENABLE : DA280_MODE_DISABLE;
return i2c_smbus_write_byte_data(client, DA280_REG_MODE_BW, data);
}
static int da280_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct da280_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = i2c_smbus_read_word_data(data->client, chan->address);
if (ret < 0)
return ret;
/*
* Values are 14 bits, stored as 16 bits with the 2
* least significant bits always 0.
*/
*val = (short)ret >> 2;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
*val2 = da280_nscale;
return IIO_VAL_INT_PLUS_NANO;
default:
return -EINVAL;
}
}
static const struct iio_info da280_info = {
.read_raw = da280_read_raw,
};
static void da280_disable(void *client)
{
da280_enable(client, false);
}
static int da280_probe(struct i2c_client *client)
{
const struct da280_match_data *match_data;
struct iio_dev *indio_dev;
struct da280_data *data;
int ret;
ret = i2c_smbus_read_byte_data(client, DA280_REG_CHIP_ID);
if (ret != DA280_CHIP_ID)
return (ret < 0) ? ret : -ENODEV;
match_data = i2c_get_match_data(client);
if (!match_data) {
dev_err(&client->dev, "Error match-data not set\n");
return -EINVAL;
}
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
data->client = client;
indio_dev->info = &da280_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = da280_channels;
indio_dev->num_channels = match_data->num_channels;
indio_dev->name = match_data->name;
ret = da280_enable(client, true);
if (ret < 0)
return ret;
ret = devm_add_action_or_reset(&client->dev, da280_disable, client);
if (ret)
return ret;
return devm_iio_device_register(&client->dev, indio_dev);
}
static int da280_suspend(struct device *dev)
{
return da280_enable(to_i2c_client(dev), false);
}
static int da280_resume(struct device *dev)
{
return da280_enable(to_i2c_client(dev), true);
}
static DEFINE_SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume);
static const struct da280_match_data da217_match_data = { "da217", 3 };
static const struct da280_match_data da226_match_data = { "da226", 2 };
static const struct da280_match_data da280_match_data = { "da280", 3 };
static const struct acpi_device_id da280_acpi_match[] = {
{ "NSA2513", (kernel_ulong_t)&da217_match_data },
{ "MIRAACC", (kernel_ulong_t)&da280_match_data },
{}
};
MODULE_DEVICE_TABLE(acpi, da280_acpi_match);
static const struct i2c_device_id da280_i2c_id[] = {
{ "da217", (kernel_ulong_t)&da217_match_data },
{ "da226", (kernel_ulong_t)&da226_match_data },
{ "da280", (kernel_ulong_t)&da280_match_data },
{}
};
MODULE_DEVICE_TABLE(i2c, da280_i2c_id);
static struct i2c_driver da280_driver = {
.driver = {
.name = "da280",
.acpi_match_table = da280_acpi_match,
.pm = pm_sleep_ptr(&da280_pm_ops),
},
.probe = da280_probe,
.id_table = da280_i2c_id,
};
module_i2c_driver(da280_driver);
MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
MODULE_DESCRIPTION("MiraMEMS DA280 3-Axis Accelerometer driver");
MODULE_LICENSE("GPL v2");
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