iio: accel: Add driver for the mCube MC3230 3-axis accelerometer
Add an IIO driver for the mCube MC3230 3-axis accelerometer. A datasheet for the mCube MC3230 can be found here: http://www.mcubemems.com/wp-content/uploads/2014/10/MC3230_2-Datasheet-APS-048-0007v1.6.pdf Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Hans de Goede
Jonathan Cameron
parent
5620318828
commit
063e3303a9
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@ -57,6 +57,7 @@ maxim,ds1050 5 Bit Programmable, Pulse-Width Modulator
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maxim,max1237 Low-Power, 4-/12-Channel, 2-Wire Serial, 12-Bit ADCs
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maxim,max6625 9-Bit/12-Bit Temperature Sensors with I²C-Compatible Serial Interface
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mc,rv3029c2 Real Time Clock Module with I2C-Bus
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mcube,mc3230 mCube 3-axis 8-bit digital accelerometer
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microchip,mcp4531-502 Microchip 7-bit Single I2C Digital Potentiometer (5k)
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microchip,mcp4531-103 Microchip 7-bit Single I2C Digital Potentiometer (10k)
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microchip,mcp4531-503 Microchip 7-bit Single I2C Digital Potentiometer (50k)
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@ -161,6 +161,16 @@ config KXCJK1013
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To compile this driver as a module, choose M here: the module will
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be called kxcjk-1013.
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config MC3230
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tristate "mCube MC3230 Digital Accelerometer Driver"
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depends on I2C
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help
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Say yes here to build support for the mCube MC3230 low-g tri-axial
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digital accelerometer.
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To compile this driver as a module, choose M here: the
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module will be called mc3230.
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config MMA7455
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tristate
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select IIO_BUFFER
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@ -15,6 +15,7 @@ obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
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obj-$(CONFIG_KXSD9) += kxsd9.o
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obj-$(CONFIG_KXSD9_SPI) += kxsd9-spi.o
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obj-$(CONFIG_KXSD9_I2C) += kxsd9-i2c.o
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obj-$(CONFIG_MC3230) += mc3230.o
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obj-$(CONFIG_MMA7455) += mma7455_core.o
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obj-$(CONFIG_MMA7455_I2C) += mma7455_i2c.o
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@ -0,0 +1,211 @@
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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 <hdegoede@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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.driver_module = THIS_MODULE,
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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->dev.parent = &client->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 <hdegoede@redhat.com>");
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MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver");
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MODULE_LICENSE("GPL v2");
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