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147 lines
3.5 KiB
147 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* IIO driver for the 3-axis accelerometer Domintech DMARD09. |
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* |
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* Copyright (c) 2016, Jelle van der Waa <[email protected]> |
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*/ |
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#include <asm/unaligned.h> |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/iio/iio.h> |
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#define DMARD09_DRV_NAME "dmard09" |
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#define DMARD09_REG_CHIPID 0x18 |
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#define DMARD09_REG_STAT 0x0A |
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#define DMARD09_REG_X 0x0C |
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#define DMARD09_REG_Y 0x0E |
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#define DMARD09_REG_Z 0x10 |
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#define DMARD09_CHIPID 0x95 |
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#define DMARD09_BUF_LEN 8 |
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#define DMARD09_AXIS_X 0 |
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#define DMARD09_AXIS_Y 1 |
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#define DMARD09_AXIS_Z 2 |
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#define DMARD09_AXIS_X_OFFSET ((DMARD09_AXIS_X + 1) * 2) |
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#define DMARD09_AXIS_Y_OFFSET ((DMARD09_AXIS_Y + 1 )* 2) |
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#define DMARD09_AXIS_Z_OFFSET ((DMARD09_AXIS_Z + 1) * 2) |
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struct dmard09_data { |
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struct i2c_client *client; |
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}; |
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#define DMARD09_CHANNEL(_axis, offset) { \ |
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.type = IIO_ACCEL, \ |
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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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.address = offset, \ |
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.channel2 = IIO_MOD_##_axis, \ |
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} |
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static const struct iio_chan_spec dmard09_channels[] = { |
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DMARD09_CHANNEL(X, DMARD09_AXIS_X_OFFSET), |
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DMARD09_CHANNEL(Y, DMARD09_AXIS_Y_OFFSET), |
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DMARD09_CHANNEL(Z, DMARD09_AXIS_Z_OFFSET), |
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}; |
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static int dmard09_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 dmard09_data *data = iio_priv(indio_dev); |
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u8 buf[DMARD09_BUF_LEN]; |
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int ret; |
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s16 accel; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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/* |
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* Read from the DMAR09_REG_STAT register, since the chip |
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* caches reads from the individual X, Y, Z registers. |
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*/ |
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ret = i2c_smbus_read_i2c_block_data(data->client, |
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DMARD09_REG_STAT, |
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DMARD09_BUF_LEN, buf); |
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if (ret < 0) { |
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dev_err(&data->client->dev, "Error reading reg %d\n", |
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DMARD09_REG_STAT); |
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return ret; |
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} |
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accel = get_unaligned_le16(&buf[chan->address]); |
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/* Remove lower 3 bits and sign extend */ |
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accel <<= 4; |
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accel >>= 7; |
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*val = accel; |
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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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} |
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static const struct iio_info dmard09_info = { |
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.read_raw = dmard09_read_raw, |
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}; |
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static int dmard09_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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int ret; |
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struct iio_dev *indio_dev; |
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struct dmard09_data *data; |
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); |
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if (!indio_dev) { |
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dev_err(&client->dev, "iio allocation failed\n"); |
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return -ENOMEM; |
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} |
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data = iio_priv(indio_dev); |
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data->client = client; |
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ret = i2c_smbus_read_byte_data(data->client, DMARD09_REG_CHIPID); |
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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 != DMARD09_CHIPID) { |
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dev_err(&client->dev, "Invalid chip id %d\n", ret); |
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return -ENODEV; |
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} |
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i2c_set_clientdata(client, indio_dev); |
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indio_dev->name = DMARD09_DRV_NAME; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = dmard09_channels; |
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indio_dev->num_channels = ARRAY_SIZE(dmard09_channels); |
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indio_dev->info = &dmard09_info; |
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return devm_iio_device_register(&client->dev, indio_dev); |
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} |
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static const struct i2c_device_id dmard09_id[] = { |
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{ "dmard09", 0}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(i2c, dmard09_id); |
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static struct i2c_driver dmard09_driver = { |
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.driver = { |
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.name = DMARD09_DRV_NAME |
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}, |
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.probe = dmard09_probe, |
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.id_table = dmard09_id, |
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}; |
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module_i2c_driver(dmard09_driver); |
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MODULE_AUTHOR("Jelle van der Waa <[email protected]>"); |
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MODULE_DESCRIPTION("DMARD09 3-axis accelerometer driver"); |
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MODULE_LICENSE("GPL");
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