2019-06-01 08:08:37 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2016-07-25 15:21:18 +00:00
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/*
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* IIO driver for Domintech DMARD06 accelerometer
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*
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* Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com>
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*/
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#include <linux/module.h>
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2020-04-24 22:44:37 +00:00
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#include <linux/mod_devicetable.h>
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2016-07-25 15:21:18 +00:00
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#define DMARD06_DRV_NAME "dmard06"
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/* Device data registers */
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#define DMARD06_CHIP_ID_REG 0x0f
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#define DMARD06_TOUT_REG 0x40
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#define DMARD06_XOUT_REG 0x41
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#define DMARD06_YOUT_REG 0x42
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#define DMARD06_ZOUT_REG 0x43
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#define DMARD06_CTRL1_REG 0x44
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/* Device ID value */
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#define DMARD05_CHIP_ID 0x05
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#define DMARD06_CHIP_ID 0x06
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#define DMARD07_CHIP_ID 0x07
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/* Device values */
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#define DMARD05_AXIS_SCALE_VAL 15625
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#define DMARD06_AXIS_SCALE_VAL 31250
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#define DMARD06_TEMP_CENTER_VAL 25
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#define DMARD06_SIGN_BIT 7
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/* Device power modes */
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#define DMARD06_MODE_NORMAL 0x27
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#define DMARD06_MODE_POWERDOWN 0x00
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/* Device channels */
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#define DMARD06_ACCEL_CHANNEL(_axis, _reg) { \
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.type = IIO_ACCEL, \
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.address = _reg, \
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.channel2 = IIO_MOD_##_axis, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.modified = 1, \
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}
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#define DMARD06_TEMP_CHANNEL(_reg) { \
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.type = IIO_TEMP, \
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.address = _reg, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_OFFSET), \
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}
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struct dmard06_data {
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struct i2c_client *client;
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u8 chip_id;
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};
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static const struct iio_chan_spec dmard06_channels[] = {
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DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG),
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DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG),
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DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG),
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DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG),
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};
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static int dmard06_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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struct dmard06_data *dmard06 = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = i2c_smbus_read_byte_data(dmard06->client,
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chan->address);
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if (ret < 0) {
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dev_err(&dmard06->client->dev,
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"Error reading data: %d\n", ret);
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return ret;
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}
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*val = sign_extend32(ret, DMARD06_SIGN_BIT);
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if (dmard06->chip_id == DMARD06_CHIP_ID)
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*val = *val >> 1;
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switch (chan->type) {
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case IIO_ACCEL:
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return IIO_VAL_INT;
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case IIO_TEMP:
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if (dmard06->chip_id != DMARD06_CHIP_ID)
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*val = *val / 2;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_OFFSET:
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switch (chan->type) {
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case IIO_TEMP:
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*val = DMARD06_TEMP_CENTER_VAL;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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case IIO_CHAN_INFO_SCALE:
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switch (chan->type) {
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case IIO_ACCEL:
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*val = 0;
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if (dmard06->chip_id == DMARD06_CHIP_ID)
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*val2 = DMARD06_AXIS_SCALE_VAL;
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else
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*val2 = DMARD05_AXIS_SCALE_VAL;
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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default:
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return -EINVAL;
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}
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}
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static const struct iio_info dmard06_info = {
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.read_raw = dmard06_read_raw,
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};
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2022-10-23 13:22:46 +00:00
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static int dmard06_probe(struct i2c_client *client)
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2016-07-25 15:21:18 +00:00
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{
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int ret;
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struct iio_dev *indio_dev;
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struct dmard06_data *dmard06;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
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dev_err(&client->dev, "I2C check functionality failed\n");
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return -ENXIO;
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}
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
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if (!indio_dev) {
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dev_err(&client->dev, "Failed to allocate iio device\n");
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return -ENOMEM;
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}
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dmard06 = iio_priv(indio_dev);
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dmard06->client = client;
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ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG);
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if (ret < 0) {
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dev_err(&client->dev, "Error reading chip id: %d\n", ret);
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return ret;
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}
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if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID &&
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ret != DMARD07_CHIP_ID) {
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dev_err(&client->dev, "Invalid chip id: %02d\n", ret);
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return -ENODEV;
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}
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dmard06->chip_id = ret;
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i2c_set_clientdata(client, indio_dev);
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indio_dev->name = DMARD06_DRV_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = dmard06_channels;
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indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
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indio_dev->info = &dmard06_info;
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return devm_iio_device_register(&client->dev, indio_dev);
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}
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static int dmard06_suspend(struct device *dev)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
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struct dmard06_data *dmard06 = iio_priv(indio_dev);
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int ret;
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ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
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DMARD06_MODE_POWERDOWN);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int dmard06_resume(struct device *dev)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
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struct dmard06_data *dmard06 = iio_priv(indio_dev);
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int ret;
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ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
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DMARD06_MODE_NORMAL);
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if (ret < 0)
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return ret;
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return 0;
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}
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2022-01-30 19:31:00 +00:00
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static DEFINE_SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend,
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dmard06_resume);
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2016-07-25 15:21:18 +00:00
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static const struct i2c_device_id dmard06_id[] = {
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{ "dmard05", 0 },
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{ "dmard06", 0 },
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{ "dmard07", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, dmard06_id);
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static const struct of_device_id dmard06_of_match[] = {
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{ .compatible = "domintech,dmard05" },
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{ .compatible = "domintech,dmard06" },
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{ .compatible = "domintech,dmard07" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, dmard06_of_match);
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static struct i2c_driver dmard06_driver = {
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2022-10-23 13:22:46 +00:00
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.probe_new = dmard06_probe,
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2016-07-25 15:21:18 +00:00
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.id_table = dmard06_id,
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.driver = {
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.name = DMARD06_DRV_NAME,
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2020-04-24 22:44:37 +00:00
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.of_match_table = dmard06_of_match,
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2022-01-30 19:31:00 +00:00
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.pm = pm_sleep_ptr(&dmard06_pm_ops),
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2016-07-25 15:21:18 +00:00
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},
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};
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module_i2c_driver(dmard06_driver);
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MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
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MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
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MODULE_LICENSE("GPL v2");
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