![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
207 lines
4.7 KiB
C
207 lines
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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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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* 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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.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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