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205 lines
4.6 KiB
205 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* IIO driver for the MiraMEMS DA280 3-axis accelerometer and |
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* IIO driver for the MiraMEMS DA226 2-axis accelerometer |
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* |
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* Copyright (c) 2016 Hans de Goede <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/i2c.h> |
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#include <linux/acpi.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#include <linux/byteorder/generic.h> |
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#define DA280_REG_CHIP_ID 0x01 |
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#define DA280_REG_ACC_X_LSB 0x02 |
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#define DA280_REG_ACC_Y_LSB 0x04 |
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#define DA280_REG_ACC_Z_LSB 0x06 |
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#define DA280_REG_MODE_BW 0x11 |
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#define DA280_CHIP_ID 0x13 |
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#define DA280_MODE_ENABLE 0x1e |
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#define DA280_MODE_DISABLE 0x9e |
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enum da280_chipset { da226, da280 }; |
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/* |
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* a value of + or -4096 corresponds to + or - 1G |
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* scale = 9.81 / 4096 = 0.002395019 |
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*/ |
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static const int da280_nscale = 2395019; |
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#define DA280_CHANNEL(reg, axis) { \ |
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.type = IIO_ACCEL, \ |
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.address = reg, \ |
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.modified = 1, \ |
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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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} |
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static const struct iio_chan_spec da280_channels[] = { |
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DA280_CHANNEL(DA280_REG_ACC_X_LSB, X), |
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DA280_CHANNEL(DA280_REG_ACC_Y_LSB, Y), |
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DA280_CHANNEL(DA280_REG_ACC_Z_LSB, Z), |
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}; |
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struct da280_data { |
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struct i2c_client *client; |
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}; |
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static int da280_enable(struct i2c_client *client, bool enable) |
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{ |
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u8 data = enable ? DA280_MODE_ENABLE : DA280_MODE_DISABLE; |
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return i2c_smbus_write_byte_data(client, DA280_REG_MODE_BW, data); |
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} |
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static int da280_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 da280_data *data = 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_word_data(data->client, chan->address); |
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if (ret < 0) |
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return ret; |
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/* |
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* Values are 14 bits, stored as 16 bits with the 2 |
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* least significant bits always 0. |
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*/ |
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*val = (short)ret >> 2; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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*val = 0; |
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*val2 = da280_nscale; |
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return IIO_VAL_INT_PLUS_NANO; |
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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 da280_info = { |
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.read_raw = da280_read_raw, |
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}; |
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static enum da280_chipset da280_match_acpi_device(struct device *dev) |
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{ |
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const struct acpi_device_id *id; |
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id = acpi_match_device(dev->driver->acpi_match_table, dev); |
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if (!id) |
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return -EINVAL; |
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return (enum da280_chipset) id->driver_data; |
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} |
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static int da280_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 da280_data *data; |
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enum da280_chipset chip; |
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ret = i2c_smbus_read_byte_data(client, DA280_REG_CHIP_ID); |
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if (ret != DA280_CHIP_ID) |
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return (ret < 0) ? ret : -ENODEV; |
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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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return -ENOMEM; |
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data = iio_priv(indio_dev); |
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data->client = client; |
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i2c_set_clientdata(client, indio_dev); |
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indio_dev->info = &da280_info; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = da280_channels; |
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if (ACPI_HANDLE(&client->dev)) { |
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chip = da280_match_acpi_device(&client->dev); |
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} else { |
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chip = id->driver_data; |
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} |
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if (chip == da226) { |
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indio_dev->name = "da226"; |
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indio_dev->num_channels = 2; |
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} else { |
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indio_dev->name = "da280"; |
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indio_dev->num_channels = 3; |
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} |
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ret = da280_enable(client, true); |
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if (ret < 0) |
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return ret; |
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ret = iio_device_register(indio_dev); |
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if (ret < 0) { |
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dev_err(&client->dev, "device_register failed\n"); |
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da280_enable(client, false); |
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} |
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return ret; |
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} |
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static int da280_remove(struct i2c_client *client) |
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{ |
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struct iio_dev *indio_dev = i2c_get_clientdata(client); |
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iio_device_unregister(indio_dev); |
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return da280_enable(client, false); |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int da280_suspend(struct device *dev) |
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{ |
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return da280_enable(to_i2c_client(dev), false); |
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} |
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static int da280_resume(struct device *dev) |
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{ |
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return da280_enable(to_i2c_client(dev), true); |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(da280_pm_ops, da280_suspend, da280_resume); |
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static const struct acpi_device_id da280_acpi_match[] = { |
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{"MIRAACC", da280}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, da280_acpi_match); |
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static const struct i2c_device_id da280_i2c_id[] = { |
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{ "da226", da226 }, |
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{ "da280", da280 }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, da280_i2c_id); |
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static struct i2c_driver da280_driver = { |
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.driver = { |
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.name = "da280", |
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.acpi_match_table = ACPI_PTR(da280_acpi_match), |
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.pm = &da280_pm_ops, |
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}, |
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.probe = da280_probe, |
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.remove = da280_remove, |
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.id_table = da280_i2c_id, |
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}; |
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module_i2c_driver(da280_driver); |
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MODULE_AUTHOR("Hans de Goede <[email protected]>"); |
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MODULE_DESCRIPTION("MiraMEMS DA280 3-Axis Accelerometer driver"); |
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MODULE_LICENSE("GPL v2");
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