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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * mCube MC3230 3-Axis Accelerometer4 *5 * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>6 *7 * IIO driver for mCube MC3230; 7-bit I2C address: 0x4c.8 */9 10#include <linux/i2c.h>11#include <linux/module.h>12#include <linux/iio/iio.h>13#include <linux/iio/sysfs.h>14 15#define MC3230_REG_XOUT 0x0016#define MC3230_REG_YOUT 0x0117#define MC3230_REG_ZOUT 0x0218 19#define MC3230_REG_MODE 0x0720#define MC3230_MODE_OPCON_MASK 0x0321#define MC3230_MODE_OPCON_WAKE 0x0122#define MC3230_MODE_OPCON_STANDBY 0x0323 24#define MC3230_REG_CHIP_ID 0x1825#define MC3230_CHIP_ID 0x0126 27#define MC3230_REG_PRODUCT_CODE 0x3b28#define MC3230_PRODUCT_CODE 0x1929 30/*31 * The accelerometer has one measurement range:32 *33 * -1.5g - +1.5g (8-bit, signed)34 *35 * scale = (1.5 + 1.5) * 9.81 / (2^8 - 1) = 0.11541176536 */37 38static const int mc3230_nscale = 115411765;39 40#define MC3230_CHANNEL(reg, axis) { \41 .type = IIO_ACCEL, \42 .address = reg, \43 .modified = 1, \44 .channel2 = IIO_MOD_##axis, \45 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \46 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \47}48 49static const struct iio_chan_spec mc3230_channels[] = {50 MC3230_CHANNEL(MC3230_REG_XOUT, X),51 MC3230_CHANNEL(MC3230_REG_YOUT, Y),52 MC3230_CHANNEL(MC3230_REG_ZOUT, Z),53};54 55struct mc3230_data {56 struct i2c_client *client;57};58 59static int mc3230_set_opcon(struct mc3230_data *data, int opcon)60{61 int ret;62 struct i2c_client *client = data->client;63 64 ret = i2c_smbus_read_byte_data(client, MC3230_REG_MODE);65 if (ret < 0) {66 dev_err(&client->dev, "failed to read mode reg: %d\n", ret);67 return ret;68 }69 70 ret &= ~MC3230_MODE_OPCON_MASK;71 ret |= opcon;72 73 ret = i2c_smbus_write_byte_data(client, MC3230_REG_MODE, ret);74 if (ret < 0) {75 dev_err(&client->dev, "failed to write mode reg: %d\n", ret);76 return ret;77 }78 79 return 0;80}81 82static int mc3230_read_raw(struct iio_dev *indio_dev,83 struct iio_chan_spec const *chan,84 int *val, int *val2, long mask)85{86 struct mc3230_data *data = iio_priv(indio_dev);87 int ret;88 89 switch (mask) {90 case IIO_CHAN_INFO_RAW:91 ret = i2c_smbus_read_byte_data(data->client, chan->address);92 if (ret < 0)93 return ret;94 *val = sign_extend32(ret, 7);95 return IIO_VAL_INT;96 case IIO_CHAN_INFO_SCALE:97 *val = 0;98 *val2 = mc3230_nscale;99 return IIO_VAL_INT_PLUS_NANO;100 default:101 return -EINVAL;102 }103}104 105static const struct iio_info mc3230_info = {106 .read_raw = mc3230_read_raw,107};108 109static int mc3230_probe(struct i2c_client *client)110{111 int ret;112 struct iio_dev *indio_dev;113 struct mc3230_data *data;114 115 /* First check chip-id and product-id */116 ret = i2c_smbus_read_byte_data(client, MC3230_REG_CHIP_ID);117 if (ret != MC3230_CHIP_ID)118 return (ret < 0) ? ret : -ENODEV;119 120 ret = i2c_smbus_read_byte_data(client, MC3230_REG_PRODUCT_CODE);121 if (ret != MC3230_PRODUCT_CODE)122 return (ret < 0) ? ret : -ENODEV;123 124 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));125 if (!indio_dev) {126 dev_err(&client->dev, "iio allocation failed!\n");127 return -ENOMEM;128 }129 130 data = iio_priv(indio_dev);131 data->client = client;132 i2c_set_clientdata(client, indio_dev);133 134 indio_dev->info = &mc3230_info;135 indio_dev->name = "mc3230";136 indio_dev->modes = INDIO_DIRECT_MODE;137 indio_dev->channels = mc3230_channels;138 indio_dev->num_channels = ARRAY_SIZE(mc3230_channels);139 140 ret = mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);141 if (ret < 0)142 return ret;143 144 ret = iio_device_register(indio_dev);145 if (ret < 0) {146 dev_err(&client->dev, "device_register failed\n");147 mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);148 }149 150 return ret;151}152 153static void mc3230_remove(struct i2c_client *client)154{155 struct iio_dev *indio_dev = i2c_get_clientdata(client);156 157 iio_device_unregister(indio_dev);158 159 mc3230_set_opcon(iio_priv(indio_dev), MC3230_MODE_OPCON_STANDBY);160}161 162static int mc3230_suspend(struct device *dev)163{164 struct mc3230_data *data;165 166 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));167 168 return mc3230_set_opcon(data, MC3230_MODE_OPCON_STANDBY);169}170 171static int mc3230_resume(struct device *dev)172{173 struct mc3230_data *data;174 175 data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));176 177 return mc3230_set_opcon(data, MC3230_MODE_OPCON_WAKE);178}179 180static DEFINE_SIMPLE_DEV_PM_OPS(mc3230_pm_ops, mc3230_suspend, mc3230_resume);181 182static const struct i2c_device_id mc3230_i2c_id[] = {183 { "mc3230" },184 {}185};186MODULE_DEVICE_TABLE(i2c, mc3230_i2c_id);187 188static struct i2c_driver mc3230_driver = {189 .driver = {190 .name = "mc3230",191 .pm = pm_sleep_ptr(&mc3230_pm_ops),192 },193 .probe = mc3230_probe,194 .remove = mc3230_remove,195 .id_table = mc3230_i2c_id,196};197 198module_i2c_driver(mc3230_driver);199 200MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");201MODULE_DESCRIPTION("mCube MC3230 3-Axis Accelerometer driver");202MODULE_LICENSE("GPL v2");203