Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Hans de Goede | 784 | 99.75% | 1 | 50.00% |
Thomas Gleixner | 2 | 0.25% | 1 | 50.00% |
Total | 786 | 2 |
// SPDX-License-Identifier: GPL-2.0-or-later /** * mCube MC3230 3-Axis Accelerometer * * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com> * * 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->dev.parent = &client->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 int mc3230_remove(struct i2c_client *client) { struct iio_dev *indio_dev = i2c_get_clientdata(client); iio_device_unregister(indio_dev); return mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY); } #ifdef CONFIG_PM_SLEEP 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); } #endif static 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 = &mc3230_pm_ops, }, .probe = mc3230_probe, .remove = mc3230_remove, .id_table = mc3230_i2c_id, }; module_i2c_driver(mc3230_driver); MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>"); MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver"); MODULE_LICENSE("GPL v2");
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