// SPDX-License-Identifier: GPL-2.0-only /* * MMC35240 - MEMSIC 3-axis Magnetic Sensor * * Copyright (c) 2015, Intel Corporation. * * IIO driver for MMC35240 (7-bit I2C slave address 0x30). * * TODO: offset, ACPI, continuous measurement mode, PM */ #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/init.h> #include <linux/i2c.h> #include <linux/delay.h> #include <linux/regmap.h> #include <linux/pm.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #define MMC35240_DRV_NAME … #define MMC35240_REGMAP_NAME … #define MMC35240_REG_XOUT_L … #define MMC35240_REG_XOUT_H … #define MMC35240_REG_YOUT_L … #define MMC35240_REG_YOUT_H … #define MMC35240_REG_ZOUT_L … #define MMC35240_REG_ZOUT_H … #define MMC35240_REG_STATUS … #define MMC35240_REG_CTRL0 … #define MMC35240_REG_CTRL1 … #define MMC35240_REG_ID … #define MMC35240_STATUS_MEAS_DONE_BIT … #define MMC35240_CTRL0_REFILL_BIT … #define MMC35240_CTRL0_RESET_BIT … #define MMC35240_CTRL0_SET_BIT … #define MMC35240_CTRL0_CMM_BIT … #define MMC35240_CTRL0_TM_BIT … /* output resolution bits */ #define MMC35240_CTRL1_BW0_BIT … #define MMC35240_CTRL1_BW1_BIT … #define MMC35240_CTRL1_BW_MASK … #define MMC35240_CTRL1_BW_SHIFT … #define MMC35240_WAIT_CHARGE_PUMP … #define MMC35240_WAIT_SET_RESET … /* * Memsic OTP process code piece is put here for reference: * * #define OTP_CONVERT(REG) ((float)((REG) >=32 ? (32 - (REG)) : (REG)) * 0.006 * 1) For X axis, the COEFFICIENT is always 1. * 2) For Y axis, the COEFFICIENT is as below: * f_OTP_matrix[4] = OTP_CONVERT(((reg_data[1] & 0x03) << 4) | * (reg_data[2] >> 4)) + 1.0; * 3) For Z axis, the COEFFICIENT is as below: * f_OTP_matrix[8] = (OTP_CONVERT(reg_data[3] & 0x3f) + 1) * 1.35; * We implemented the OTP logic into driver. */ /* scale = 1000 here for Y otp */ #define MMC35240_OTP_CONVERT_Y(REG) … /* 0.6 * 1.35 = 0.81, scale 10000 for Z otp */ #define MMC35240_OTP_CONVERT_Z(REG) … #define MMC35240_X_COEFF(x) … #define MMC35240_Y_COEFF(y) … #define MMC35240_Z_COEFF(z) … #define MMC35240_OTP_START_ADDR … enum mmc35240_resolution { … }; enum mmc35240_axis { … }; static const struct { … } mmc35240_props_table[] = …; struct mmc35240_data { … }; static const struct { … } mmc35240_samp_freq[] = …; static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("1.5 13 25 50"); #define MMC35240_CHANNEL(_axis) … static const struct iio_chan_spec mmc35240_channels[] = …; static struct attribute *mmc35240_attributes[] = …; static const struct attribute_group mmc35240_attribute_group = …; static int mmc35240_get_samp_freq_index(struct mmc35240_data *data, int val, int val2) { … } static int mmc35240_hw_set(struct mmc35240_data *data, bool set) { … } static int mmc35240_init(struct mmc35240_data *data) { … } static int mmc35240_take_measurement(struct mmc35240_data *data) { … } static int mmc35240_read_measurement(struct mmc35240_data *data, __le16 buf[3]) { … } /** * mmc35240_raw_to_mgauss - convert raw readings to milli gauss. Also apply * compensation for output value. * * @data: device private data * @index: axis index for which we want the conversion * @buf: raw data to be converted, 2 bytes in little endian format * @val: compensated output reading (unit is milli gauss) * * Returns: 0 in case of success, -EINVAL when @index is not valid */ static int mmc35240_raw_to_mgauss(struct mmc35240_data *data, int index, __le16 buf[], int *val) { … } static int mmc35240_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, int *val2, long mask) { … } static int mmc35240_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { … } static const struct iio_info mmc35240_info = …; static bool mmc35240_is_writeable_reg(struct device *dev, unsigned int reg) { … } static bool mmc35240_is_readable_reg(struct device *dev, unsigned int reg) { … } static bool mmc35240_is_volatile_reg(struct device *dev, unsigned int reg) { … } static const struct reg_default mmc35240_reg_defaults[] = …; static const struct regmap_config mmc35240_regmap_config = …; static int mmc35240_probe(struct i2c_client *client) { … } static int mmc35240_suspend(struct device *dev) { … } static int mmc35240_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(mmc35240_pm_ops, mmc35240_suspend, mmc35240_resume); static const struct of_device_id mmc35240_of_match[] = …; MODULE_DEVICE_TABLE(of, mmc35240_of_match); static const struct acpi_device_id mmc35240_acpi_match[] = …; MODULE_DEVICE_TABLE(acpi, mmc35240_acpi_match); static const struct i2c_device_id mmc35240_id[] = …; MODULE_DEVICE_TABLE(i2c, mmc35240_id); static struct i2c_driver mmc35240_driver = …; module_i2c_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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