drivers/iio/accel/dmard06.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * IIO driver for Domintech DMARD06 accelerometer
   4  *
   5  * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/mod_devicetable.h>
  10 #include <linux/i2c.h>
  11 #include <linux/iio/iio.h>
  12
  13 #define DMARD06_DRV_NAME                "dmard06"
  14
  15 /* Device data registers */
  16 #define DMARD06_CHIP_ID_REG             0x0f
  17 #define DMARD06_TOUT_REG                0x40
  18 #define DMARD06_XOUT_REG                0x41
  19 #define DMARD06_YOUT_REG                0x42
  20 #define DMARD06_ZOUT_REG                0x43
  21 #define DMARD06_CTRL1_REG               0x44
  22
  23 /* Device ID value */
  24 #define DMARD05_CHIP_ID                 0x05
  25 #define DMARD06_CHIP_ID                 0x06
  26 #define DMARD07_CHIP_ID                 0x07
  27
  28 /* Device values */
  29 #define DMARD05_AXIS_SCALE_VAL          15625
  30 #define DMARD06_AXIS_SCALE_VAL          31250
  31 #define DMARD06_TEMP_CENTER_VAL         25
  32 #define DMARD06_SIGN_BIT                7
  33
  34 /* Device power modes */
  35 #define DMARD06_MODE_NORMAL             0x27
  36 #define DMARD06_MODE_POWERDOWN          0x00
  37
  38 /* Device channels */
  39 #define DMARD06_ACCEL_CHANNEL(_axis, _reg) {                    \
  40         .type = IIO_ACCEL,                                      \
  41         .address = _reg,                                        \
  42         .channel2 = IIO_MOD_##_axis,                            \
  43         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),           \
  44         .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),   \
  45         .modified = 1,                                          \
  46 }
  47
  48 #define DMARD06_TEMP_CHANNEL(_reg) {                            \
  49         .type = IIO_TEMP,                                       \
  50         .address = _reg,                                        \
  51         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
  52                               BIT(IIO_CHAN_INFO_OFFSET),        \
  53 }
  54
  55 struct dmard06_data {
  56         struct i2c_client *client;
  57         u8 chip_id;
  58 };
  59
  60 static const struct iio_chan_spec dmard06_channels[] = {
  61         DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG),
  62         DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG),
  63         DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG),
  64         DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG),
  65 };
  66
  67 static int dmard06_read_raw(struct iio_dev *indio_dev,
  68                             struct iio_chan_spec const *chan,
  69                             int *val, int *val2, long mask)
  70 {
  71         struct dmard06_data *dmard06 = iio_priv(indio_dev);
  72         int ret;
  73
  74         switch (mask) {
  75         case IIO_CHAN_INFO_RAW:
  76                 ret = i2c_smbus_read_byte_data(dmard06->client,
  77                                                chan->address);
  78                 if (ret < 0) {
  79                         dev_err(&dmard06->client->dev,
  80                                 "Error reading data: %d\n", ret);
  81                         return ret;
  82                 }
  83
  84                 *val = sign_extend32(ret, DMARD06_SIGN_BIT);
  85
  86                 if (dmard06->chip_id == DMARD06_CHIP_ID)
  87                         *val = *val >> 1;
  88
  89                 switch (chan->type) {
  90                 case IIO_ACCEL:
  91                         return IIO_VAL_INT;
  92                 case IIO_TEMP:
  93                         if (dmard06->chip_id != DMARD06_CHIP_ID)
  94                                 *val = *val / 2;
  95                         return IIO_VAL_INT;
  96                 default:
  97                         return -EINVAL;
  98                 }
  99         case IIO_CHAN_INFO_OFFSET:
 100                 switch (chan->type) {
 101                 case IIO_TEMP:
 102                         *val = DMARD06_TEMP_CENTER_VAL;
 103                         return IIO_VAL_INT;
 104                 default:
 105                         return -EINVAL;
 106                 }
 107         case IIO_CHAN_INFO_SCALE:
 108                 switch (chan->type) {
 109                 case IIO_ACCEL:
 110                         *val = 0;
 111                         if (dmard06->chip_id == DMARD06_CHIP_ID)
 112                                 *val2 = DMARD06_AXIS_SCALE_VAL;
 113                         else
 114                                 *val2 = DMARD05_AXIS_SCALE_VAL;
 115                         return IIO_VAL_INT_PLUS_MICRO;
 116                 default:
 117                         return -EINVAL;
 118                 }
 119         default:
 120                 return -EINVAL;
 121         }
 122 }
 123
 124 static const struct iio_info dmard06_info = {
 125         .read_raw       = dmard06_read_raw,
 126 };
 127
 128 static int dmard06_probe(struct i2c_client *client)
 129 {
 130         int ret;
 131         struct iio_dev *indio_dev;
 132         struct dmard06_data *dmard06;
 133
 134         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 135                 dev_err(&client->dev, "I2C check functionality failed\n");
 136                 return -ENXIO;
 137         }
 138
 139         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
 140         if (!indio_dev) {
 141                 dev_err(&client->dev, "Failed to allocate iio device\n");
 142                 return -ENOMEM;
 143         }
 144
 145         dmard06 = iio_priv(indio_dev);
 146         dmard06->client = client;
 147
 148         ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG);
 149         if (ret < 0) {
 150                 dev_err(&client->dev, "Error reading chip id: %d\n", ret);
 151                 return ret;
 152         }
 153
 154         if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID &&
 155             ret != DMARD07_CHIP_ID) {
 156                 dev_err(&client->dev, "Invalid chip id: %02d\n", ret);
 157                 return -ENODEV;
 158         }
 159
 160         dmard06->chip_id = ret;
 161
 162         i2c_set_clientdata(client, indio_dev);
 163         indio_dev->name = DMARD06_DRV_NAME;
 164         indio_dev->modes = INDIO_DIRECT_MODE;
 165         indio_dev->channels = dmard06_channels;
 166         indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
 167         indio_dev->info = &dmard06_info;
 168
 169         return devm_iio_device_register(&client->dev, indio_dev);
 170 }
 171
 172 static int dmard06_suspend(struct device *dev)
 173 {
 174         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 175         struct dmard06_data *dmard06 = iio_priv(indio_dev);
 176         int ret;
 177
 178         ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
 179                                         DMARD06_MODE_POWERDOWN);
 180         if (ret < 0)
 181                 return ret;
 182
 183         return 0;
 184 }
 185
 186 static int dmard06_resume(struct device *dev)
 187 {
 188         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 189         struct dmard06_data *dmard06 = iio_priv(indio_dev);
 190         int ret;
 191
 192         ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
 193                                         DMARD06_MODE_NORMAL);
 194         if (ret < 0)
 195                 return ret;
 196
 197         return 0;
 198 }
 199
 200 static DEFINE_SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend,
 201                                 dmard06_resume);
 202
 203 static const struct i2c_device_id dmard06_id[] = {
 204         { "dmard05" },
 205         { "dmard06" },
 206         { "dmard07" },
 207         { }
 208 };
 209 MODULE_DEVICE_TABLE(i2c, dmard06_id);
 210
 211 static const struct of_device_id dmard06_of_match[] = {
 212         { .compatible = "domintech,dmard05" },
 213         { .compatible = "domintech,dmard06" },
 214         { .compatible = "domintech,dmard07" },
 215         { }
 216 };
 217 MODULE_DEVICE_TABLE(of, dmard06_of_match);
 218
 219 static struct i2c_driver dmard06_driver = {
 220         .probe = dmard06_probe,
 221         .id_table = dmard06_id,
 222         .driver = {
 223                 .name = DMARD06_DRV_NAME,
 224                 .of_match_table = dmard06_of_match,
 225                 .pm = pm_sleep_ptr(&dmard06_pm_ops),
 226         },
 227 };
 228 module_i2c_driver(dmard06_driver);
 229
 230 MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
 231 MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
 232 MODULE_LICENSE("GPL v2");