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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * mCube MC3230 3-Axis Accelerometer
- *
- * Copyright (c) 2016 Hans de Goede <[email protected]>
- *
- * IIO driver for mCube MC3230; 7-bit I2C address: 0x4c.
- */
- #include <linux/i2c.h>
- #include <linux/module.h>
- #include <linux/iio/iio.h>
- #include <linux/iio/sysfs.h>
- #define MC3230_REG_XOUT 0x00
- #define MC3230_REG_YOUT 0x01
- #define MC3230_REG_ZOUT 0x02
- #define MC3230_REG_MODE 0x07
- #define MC3230_MODE_OPCON_MASK 0x03
- #define MC3230_MODE_OPCON_WAKE 0x01
- #define MC3230_MODE_OPCON_STANDBY 0x03
- #define MC3230_REG_CHIP_ID 0x18
- #define MC3230_CHIP_ID 0x01
- #define MC3230_REG_PRODUCT_CODE 0x3b
- #define MC3230_PRODUCT_CODE 0x19
- /*
- * The accelerometer has one measurement range:
- *
- * -1.5g - +1.5g (8-bit, signed)
- *
- * scale = (1.5 + 1.5) * 9.81 / (2^8 - 1) = 0.115411765
- */
- static const int mc3230_nscale = 115411765;
- #define MC3230_CHANNEL(reg, axis) { \
- .type = IIO_ACCEL, \
- .address = reg, \
- .modified = 1, \
- .channel2 = IIO_MOD_##axis, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
- }
- static const struct iio_chan_spec mc3230_channels[] = {
- MC3230_CHANNEL(MC3230_REG_XOUT, X),
- MC3230_CHANNEL(MC3230_REG_YOUT, Y),
- MC3230_CHANNEL(MC3230_REG_ZOUT, Z),
- };
- struct mc3230_data {
- struct i2c_client *client;
- };
- static int mc3230_set_opcon(struct mc3230_data *data, int opcon)
- {
- int ret;
- struct i2c_client *client = data->client;
- ret = i2c_smbus_read_byte_data(client, MC3230_REG_MODE);
- if (ret < 0) {
- dev_err(&client->dev, "failed to read mode reg: %d\n", ret);
- return ret;
- }
- ret &= ~MC3230_MODE_OPCON_MASK;
- ret |= opcon;
- ret = i2c_smbus_write_byte_data(client, MC3230_REG_MODE, ret);
- if (ret < 0) {
- dev_err(&client->dev, "failed to write mode reg: %d\n", ret);
- return ret;
- }
- return 0;
- }
- static int mc3230_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val, int *val2, long mask)
- {
- struct mc3230_data *data = iio_priv(indio_dev);
- int ret;
- switch (mask) {
- case IIO_CHAN_INFO_RAW:
- ret = i2c_smbus_read_byte_data(data->client, chan->address);
- if (ret < 0)
- return ret;
- *val = sign_extend32(ret, 7);
- return IIO_VAL_INT;
- case IIO_CHAN_INFO_SCALE:
- *val = 0;
- *val2 = mc3230_nscale;
- return IIO_VAL_INT_PLUS_NANO;
- default:
- return -EINVAL;
- }
- }
- static const struct iio_info mc3230_info = {
- .read_raw = mc3230_read_raw,
- };
- static int mc3230_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
- {
- int ret;
- struct iio_dev *indio_dev;
- struct mc3230_data *data;
- /* First check chip-id and product-id */
- ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID);
- if (ret != MC3230_CHIP_ID)
- return (ret < 0) ? ret : -ENODEV;
- ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE);
- if (ret != MC3230_PRODUCT_CODE)
- return (ret < 0) ? ret : -ENODEV;
- indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
- if (!indio_dev) {
- dev_err(&client->dev, "iio allocation failed!\n");
- return -ENOMEM;
- }
- data = iio_priv(indio_dev);
- data->client = client;
- i2c_set_clientdata(client, indio_dev);
- indio_dev->info = &mc3230_info;
- indio_dev->name = "mc3230";
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = mc3230_channels;
- indio_dev->num_channels = ARRAY_SIZE(mc3230_channels);
- ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);
- if (ret < 0)
- return ret;
- ret = iio_device_register(indio_dev);
- if (ret < 0) {
- dev_err(&client->dev, "device_register failed\n");
- mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);
- }
- return ret;
- }
- static void mc3230_remove(struct i2c_client *client)
- {
- struct iio_dev *indio_dev = i2c_get_clientdata(client);
- iio_device_unregister(indio_dev);
- mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY);
- }
- static int mc3230_suspend(struct device *dev)
- {
- struct mc3230_data *data;
- data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
- return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);
- }
- static int mc3230_resume(struct device *dev)
- {
- struct mc3230_data *data;
- data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
- return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);
- }
- static DEFINE_SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume);
- static const struct i2c_device_id mc3230_i2c_id[] = {
- {"mc3230", 0},
- {}
- };
- MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id);
- static struct i2c_driver mc3230_driver = {
- .driver = {
- .name = "mc3230",
- .pm = pm_sleep_ptr(&mc3230_pm_ops),
- },
- .probe = mc3230_probe,
- .remove = mc3230_remove,
- .id_table = mc3230_i2c_id,
- };
- module_i2c_driver(mc3230_driver);
- MODULE_AUTHOR("Hans de Goede <[email protected]>");
- MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver");
- MODULE_LICENSE("GPL v2");
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