// SPDX-License-Identifier: GPL-2.0-or-later /* * mCube MC3230 3-Axis Accelerometer * * Copyright (c) 2016 Hans de Goede * * IIO driver for mCube MC3230; 7-bit I2C address: 0x4c. */ #include #include #include #include #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_REG_PRODUCT_CODE 0x3b /* * The accelerometer has one measurement range: * * -1.5g - +1.5g (8-bit, signed) * */ struct mc3230_chip_info { const char *name; const u8 chip_id; const u8 product_code; const int scale; }; static const struct mc3230_chip_info mc3230_chip_info = { .name = "mc3230", .chip_id = 0x01, .product_code = 0x19, /* (1.5 + 1.5) * 9.81 / (2^8 - 1) = 0.115411765 */ .scale = 115411765, }; static const struct mc3230_chip_info mc3510c_chip_info = { .name = "mc3510c", .chip_id = 0x23, .product_code = 0x10, /* Was obtained empirically */ .scale = 625000000, }; #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), \ .ext_info = mc3230_ext_info, \ } struct mc3230_data { const struct mc3230_chip_info *chip_info; struct i2c_client *client; struct iio_mount_matrix orientation; }; static const struct iio_mount_matrix * mc3230_get_mount_matrix(const struct iio_dev *indio_dev, const struct iio_chan_spec *chan) { struct mc3230_data *data = iio_priv(indio_dev); return &data->orientation; } static const struct iio_chan_spec_ext_info mc3230_ext_info[] = { IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, mc3230_get_mount_matrix), { } }; 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), }; 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 = data->chip_info->scale; 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) { int ret; struct iio_dev *indio_dev; struct mc3230_data *data; const struct mc3230_chip_info *chip_info; chip_info = i2c_get_match_data(client); if (chip_info == NULL) { dev_err(&client->dev, "failed to get match data"); return -ENODATA; } /* First check chip-id and product-id */ ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID); if (ret != chip_info->chip_id) { dev_info(&client->dev, "chip id check fail: 0x%x != 0x%x !\n", ret, chip_info->chip_id); } ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE); if (ret != chip_info->product_code) { dev_info(&client->dev, "product code check fail: 0x%x != 0x%x !\n", ret, chip_info->product_code); } 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->chip_info = chip_info; data->client = client; i2c_set_clientdata(client, indio_dev); indio_dev->info = &mc3230_info; indio_dev->name = chip_info->name; 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_read_mount_matrix(&client->dev, &data->orientation); if (ret) 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", (kernel_ulong_t)&mc3230_chip_info }, { "mc3510c", (kernel_ulong_t)&mc3510c_chip_info }, { } }; MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id); static const struct of_device_id mc3230_of_match[] = { { .compatible = "mcube,mc3230", &mc3230_chip_info }, { .compatible = "mcube,mc3510c", &mc3510c_chip_info }, { } }; MODULE_DEVICE_TABLE(of, mc3230_of_match); static struct i2c_driver mc3230_driver = { .driver = { .name = "mc3230", .of_match_table = mc3230_of_match, .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 "); MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver"); MODULE_LICENSE("GPL v2");