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233 lines
5.6 KiB
233 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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 <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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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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static int dmard06_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 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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static DEFINE_SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend, |
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dmard06_resume); |
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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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.probe = dmard06_probe, |
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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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.of_match_table = dmard06_of_match, |
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.pm = pm_sleep_ptr(&dmard06_pm_ops), |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver"); |
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MODULE_LICENSE("GPL v2");
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