iio/accel/dmard06.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * IIO driver for Domintech DMARD06 accelerometer
0004  *
0005  * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com>
0006  */
0007
0008 #include <linux/module.h>
0009 #include <linux/mod_devicetable.h>
0010 #include <linux/i2c.h>
0011 #include <linux/iio/iio.h>
0012
0013 #define DMARD06_DRV_NAME        "dmard06"
0014
0015 /* Device data registers */
0016 #define DMARD06_CHIP_ID_REG     0x0f
0017 #define DMARD06_TOUT_REG        0x40
0018 #define DMARD06_XOUT_REG        0x41
0019 #define DMARD06_YOUT_REG        0x42
0020 #define DMARD06_ZOUT_REG        0x43
0021 #define DMARD06_CTRL1_REG       0x44
0022
0023 /* Device ID value */
0024 #define DMARD05_CHIP_ID         0x05
0025 #define DMARD06_CHIP_ID         0x06
0026 #define DMARD07_CHIP_ID         0x07
0027
0028 /* Device values */
0029 #define DMARD05_AXIS_SCALE_VAL      15625
0030 #define DMARD06_AXIS_SCALE_VAL      31250
0031 #define DMARD06_TEMP_CENTER_VAL     25
0032 #define DMARD06_SIGN_BIT        7
0033
0034 /* Device power modes */
0035 #define DMARD06_MODE_NORMAL     0x27
0036 #define DMARD06_MODE_POWERDOWN      0x00
0037
0038 /* Device channels */
0039 #define DMARD06_ACCEL_CHANNEL(_axis, _reg) {            \
0040     .type = IIO_ACCEL,                  \
0041     .address = _reg,                    \
0042     .channel2 = IIO_MOD_##_axis,                \
0043     .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),       \
0044     .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),   \
0045     .modified = 1,                      \
0046 }
0047
0048 #define DMARD06_TEMP_CHANNEL(_reg) {                \
0049     .type = IIO_TEMP,                   \
0050     .address = _reg,                    \
0051     .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |      \
0052                   BIT(IIO_CHAN_INFO_OFFSET),    \
0053 }
0054
0055 struct dmard06_data {
0056     struct i2c_client *client;
0057     u8 chip_id;
0058 };
0059
0060 static const struct iio_chan_spec dmard06_channels[] = {
0061     DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG),
0062     DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG),
0063     DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG),
0064     DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG),
0065 };
0066
0067 static int dmard06_read_raw(struct iio_dev *indio_dev,
0068                 struct iio_chan_spec const *chan,
0069                 int *val, int *val2, long mask)
0070 {
0071     struct dmard06_data *dmard06 = iio_priv(indio_dev);
0072     int ret;
0073
0074     switch (mask) {
0075     case IIO_CHAN_INFO_RAW:
0076         ret = i2c_smbus_read_byte_data(dmard06->client,
0077                            chan->address);
0078         if (ret < 0) {
0079             dev_err(&dmard06->client->dev,
0080                 "Error reading data: %d\n", ret);
0081             return ret;
0082         }
0083
0084         *val = sign_extend32(ret, DMARD06_SIGN_BIT);
0085
0086         if (dmard06->chip_id == DMARD06_CHIP_ID)
0087             *val = *val >> 1;
0088
0089         switch (chan->type) {
0090         case IIO_ACCEL:
0091             return IIO_VAL_INT;
0092         case IIO_TEMP:
0093             if (dmard06->chip_id != DMARD06_CHIP_ID)
0094                 *val = *val / 2;
0095             return IIO_VAL_INT;
0096         default:
0097             return -EINVAL;
0098         }
0099     case IIO_CHAN_INFO_OFFSET:
0100         switch (chan->type) {
0101         case IIO_TEMP:
0102             *val = DMARD06_TEMP_CENTER_VAL;
0103             return IIO_VAL_INT;
0104         default:
0105             return -EINVAL;
0106         }
0107     case IIO_CHAN_INFO_SCALE:
0108         switch (chan->type) {
0109         case IIO_ACCEL:
0110             *val = 0;
0111             if (dmard06->chip_id == DMARD06_CHIP_ID)
0112                 *val2 = DMARD06_AXIS_SCALE_VAL;
0113             else
0114                 *val2 = DMARD05_AXIS_SCALE_VAL;
0115             return IIO_VAL_INT_PLUS_MICRO;
0116         default:
0117             return -EINVAL;
0118         }
0119     default:
0120         return -EINVAL;
0121     }
0122 }
0123
0124 static const struct iio_info dmard06_info = {
0125     .read_raw   = dmard06_read_raw,
0126 };
0127
0128 static int dmard06_probe(struct i2c_client *client,
0129             const struct i2c_device_id *id)
0130 {
0131     int ret;
0132     struct iio_dev *indio_dev;
0133     struct dmard06_data *dmard06;
0134
0135     if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
0136         dev_err(&client->dev, "I2C check functionality failed\n");
0137         return -ENXIO;
0138     }
0139
0140     indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
0141     if (!indio_dev) {
0142         dev_err(&client->dev, "Failed to allocate iio device\n");
0143         return -ENOMEM;
0144     }
0145
0146     dmard06 = iio_priv(indio_dev);
0147     dmard06->client = client;
0148
0149     ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG);
0150     if (ret < 0) {
0151         dev_err(&client->dev, "Error reading chip id: %d\n", ret);
0152         return ret;
0153     }
0154
0155     if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID &&
0156         ret != DMARD07_CHIP_ID) {
0157         dev_err(&client->dev, "Invalid chip id: %02d\n", ret);
0158         return -ENODEV;
0159     }
0160
0161     dmard06->chip_id = ret;
0162
0163     i2c_set_clientdata(client, indio_dev);
0164     indio_dev->name = DMARD06_DRV_NAME;
0165     indio_dev->modes = INDIO_DIRECT_MODE;
0166     indio_dev->channels = dmard06_channels;
0167     indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
0168     indio_dev->info = &dmard06_info;
0169
0170     return devm_iio_device_register(&client->dev, indio_dev);
0171 }
0172
0173 static int dmard06_suspend(struct device *dev)
0174 {
0175     struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
0176     struct dmard06_data *dmard06 = iio_priv(indio_dev);
0177     int ret;
0178
0179     ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
0180                     DMARD06_MODE_POWERDOWN);
0181     if (ret < 0)
0182         return ret;
0183
0184     return 0;
0185 }
0186
0187 static int dmard06_resume(struct device *dev)
0188 {
0189     struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
0190     struct dmard06_data *dmard06 = iio_priv(indio_dev);
0191     int ret;
0192
0193     ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
0194                     DMARD06_MODE_NORMAL);
0195     if (ret < 0)
0196         return ret;
0197
0198     return 0;
0199 }
0200
0201 static DEFINE_SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend,
0202                 dmard06_resume);
0203
0204 static const struct i2c_device_id dmard06_id[] = {
0205     { "dmard05", 0 },
0206     { "dmard06", 0 },
0207     { "dmard07", 0 },
0208     { }
0209 };
0210 MODULE_DEVICE_TABLE(i2c, dmard06_id);
0211
0212 static const struct of_device_id dmard06_of_match[] = {
0213     { .compatible = "domintech,dmard05" },
0214     { .compatible = "domintech,dmard06" },
0215     { .compatible = "domintech,dmard07" },
0216     { }
0217 };
0218 MODULE_DEVICE_TABLE(of, dmard06_of_match);
0219
0220 static struct i2c_driver dmard06_driver = {
0221     .probe = dmard06_probe,
0222     .id_table = dmard06_id,
0223     .driver = {
0224         .name = DMARD06_DRV_NAME,
0225         .of_match_table = dmard06_of_match,
0226         .pm = pm_sleep_ptr(&dmard06_pm_ops),
0227     },
0228 };
0229 module_i2c_driver(dmard06_driver);
0230
0231 MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
0232 MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
0233 MODULE_LICENSE("GPL v2");