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205 lines
4.7 KiB
205 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* mCube MC3230 3-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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* IIO driver for mCube MC3230; 7-bit I2C address: 0x4c. |
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*/ |
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#include <linux/i2c.h> |
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#include <linux/module.h> |
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#include <linux/iio/iio.h> |
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#include <linux/iio/sysfs.h> |
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#define MC3230_REG_XOUT 0x00 |
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#define MC3230_REG_YOUT 0x01 |
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#define MC3230_REG_ZOUT 0x02 |
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#define MC3230_REG_MODE 0x07 |
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#define MC3230_MODE_OPCON_MASK 0x03 |
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#define MC3230_MODE_OPCON_WAKE 0x01 |
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#define MC3230_MODE_OPCON_STANDBY 0x03 |
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#define MC3230_REG_CHIP_ID 0x18 |
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#define MC3230_CHIP_ID 0x01 |
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#define MC3230_REG_PRODUCT_CODE 0x3b |
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#define MC3230_PRODUCT_CODE 0x19 |
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/* |
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* The accelerometer has one measurement range: |
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* |
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* -1.5g - +1.5g (8-bit, signed) |
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* |
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* scale = (1.5 + 1.5) * 9.81 / (2^8 - 1) = 0.115411765 |
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*/ |
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static const int mc3230_nscale = 115411765; |
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#define MC3230_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 mc3230_channels[] = { |
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MC3230_CHANNEL(MC3230_REG_XOUT, X), |
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MC3230_CHANNEL(MC3230_REG_YOUT, Y), |
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MC3230_CHANNEL(MC3230_REG_ZOUT, Z), |
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}; |
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struct mc3230_data { |
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struct i2c_client *client; |
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}; |
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static int mc3230_set_opcon(struct mc3230_data *data, int opcon) |
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{ |
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int ret; |
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struct i2c_client *client = data->client; |
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ret = i2c_smbus_read_byte_data(client, MC3230_REG_MODE); |
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if (ret < 0) { |
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dev_err(&client->dev, "failed to read mode reg: %d\n", ret); |
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return ret; |
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} |
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ret &= ~MC3230_MODE_OPCON_MASK; |
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ret |= opcon; |
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ret = i2c_smbus_write_byte_data(client, MC3230_REG_MODE, ret); |
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if (ret < 0) { |
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dev_err(&client->dev, "failed to write mode reg: %d\n", ret); |
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return ret; |
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} |
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return 0; |
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} |
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static int mc3230_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 mc3230_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_byte_data(data->client, chan->address); |
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if (ret < 0) |
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return ret; |
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*val = sign_extend32(ret, 7); |
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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 = mc3230_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 mc3230_info = { |
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.read_raw = mc3230_read_raw, |
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}; |
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static int mc3230_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 mc3230_data *data; |
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/* First check chip-id and product-id */ |
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ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID); |
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if (ret != MC3230_CHIP_ID) |
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return (ret < 0) ? ret : -ENODEV; |
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ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE); |
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if (ret != MC3230_PRODUCT_CODE) |
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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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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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i2c_set_clientdata(client, indio_dev); |
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indio_dev->info = &mc3230_info; |
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indio_dev->name = "mc3230"; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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indio_dev->channels = mc3230_channels; |
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indio_dev->num_channels = ARRAY_SIZE(mc3230_channels); |
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ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); |
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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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mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); |
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} |
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return ret; |
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} |
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static int mc3230_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 mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY); |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int mc3230_suspend(struct device *dev) |
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{ |
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struct mc3230_data *data; |
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data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); |
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return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY); |
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} |
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static int mc3230_resume(struct device *dev) |
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{ |
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struct mc3230_data *data; |
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data = iio_priv(i2c_get_clientdata(to_i2c_client(dev))); |
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return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE); |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume); |
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static const struct i2c_device_id mc3230_i2c_id[] = { |
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{"mc3230", 0}, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id); |
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static struct i2c_driver mc3230_driver = { |
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.driver = { |
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.name = "mc3230", |
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.pm = &mc3230_pm_ops, |
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}, |
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.probe = mc3230_probe, |
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.remove = mc3230_remove, |
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.id_table = mc3230_i2c_id, |
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}; |
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module_i2c_driver(mc3230_driver); |
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MODULE_AUTHOR("Hans de Goede <[email protected]>"); |
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MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver"); |
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MODULE_LICENSE("GPL v2");
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