drivers/iio/accel/dmard06.c

   1 /*
   2  * IIO driver for Domintech DMARD06 accelerometer
   3  *
   4  * Copyright (C) 2016 Aleksei Mamlin <mamlinav@gmail.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/i2c.h>
  13 #include <linux/iio/iio.h>
  14
  15 #define DMARD06_DRV_NAME                "dmard06"
  16
  17 /* Device data registers */
  18 #define DMARD06_CHIP_ID_REG             0x0f
  19 #define DMARD06_TOUT_REG                0x40
  20 #define DMARD06_XOUT_REG                0x41
  21 #define DMARD06_YOUT_REG                0x42
  22 #define DMARD06_ZOUT_REG                0x43
  23 #define DMARD06_CTRL1_REG               0x44
  24
  25 /* Device ID value */
  26 #define DMARD05_CHIP_ID                 0x05
  27 #define DMARD06_CHIP_ID                 0x06
  28 #define DMARD07_CHIP_ID                 0x07
  29
  30 /* Device values */
  31 #define DMARD05_AXIS_SCALE_VAL          15625
  32 #define DMARD06_AXIS_SCALE_VAL          31250
  33 #define DMARD06_TEMP_CENTER_VAL         25
  34 #define DMARD06_SIGN_BIT                7
  35
  36 /* Device power modes */
  37 #define DMARD06_MODE_NORMAL             0x27
  38 #define DMARD06_MODE_POWERDOWN          0x00
  39
  40 /* Device channels */
  41 #define DMARD06_ACCEL_CHANNEL(_axis, _reg) {                    \
  42         .type = IIO_ACCEL,                                      \
  43         .address = _reg,                                        \
  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         .modified = 1,                                          \
  48 }
  49
  50 #define DMARD06_TEMP_CHANNEL(_reg) {                            \
  51         .type = IIO_TEMP,                                       \
  52         .address = _reg,                                        \
  53         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |          \
  54                               BIT(IIO_CHAN_INFO_OFFSET),        \
  55 }
  56
  57 struct dmard06_data {
  58         struct i2c_client *client;
  59         u8 chip_id;
  60 };
  61
  62 static const struct iio_chan_spec dmard06_channels[] = {
  63         DMARD06_ACCEL_CHANNEL(X, DMARD06_XOUT_REG),
  64         DMARD06_ACCEL_CHANNEL(Y, DMARD06_YOUT_REG),
  65         DMARD06_ACCEL_CHANNEL(Z, DMARD06_ZOUT_REG),
  66         DMARD06_TEMP_CHANNEL(DMARD06_TOUT_REG),
  67 };
  68
  69 static int dmard06_read_raw(struct iio_dev *indio_dev,
  70                             struct iio_chan_spec const *chan,
  71                             int *val, int *val2, long mask)
  72 {
  73         struct dmard06_data *dmard06 = iio_priv(indio_dev);
  74         int ret;
  75
  76         switch (mask) {
  77         case IIO_CHAN_INFO_RAW:
  78                 ret = i2c_smbus_read_byte_data(dmard06->client,
  79                                                chan->address);
  80                 if (ret < 0) {
  81                         dev_err(&dmard06->client->dev,
  82                                 "Error reading data: %d\n", ret);
  83                         return ret;
  84                 }
  85
  86                 *val = sign_extend32(ret, DMARD06_SIGN_BIT);
  87
  88                 if (dmard06->chip_id == DMARD06_CHIP_ID)
  89                         *val = *val >> 1;
  90
  91                 switch (chan->type) {
  92                 case IIO_ACCEL:
  93                         return IIO_VAL_INT;
  94                 case IIO_TEMP:
  95                         if (dmard06->chip_id != DMARD06_CHIP_ID)
  96                                 *val = *val / 2;
  97                         return IIO_VAL_INT;
  98                 default:
  99                         return -EINVAL;
 100                 }
 101         case IIO_CHAN_INFO_OFFSET:
 102                 switch (chan->type) {
 103                 case IIO_TEMP:
 104                         *val = DMARD06_TEMP_CENTER_VAL;
 105                         return IIO_VAL_INT;
 106                 default:
 107                         return -EINVAL;
 108                 }
 109         case IIO_CHAN_INFO_SCALE:
 110                 switch (chan->type) {
 111                 case IIO_ACCEL:
 112                         *val = 0;
 113                         if (dmard06->chip_id == DMARD06_CHIP_ID)
 114                                 *val2 = DMARD06_AXIS_SCALE_VAL;
 115                         else
 116                                 *val2 = DMARD05_AXIS_SCALE_VAL;
 117                         return IIO_VAL_INT_PLUS_MICRO;
 118                 default:
 119                         return -EINVAL;
 120                 }
 121         default:
 122                 return -EINVAL;
 123         }
 124 }
 125
 126 static const struct iio_info dmard06_info = {
 127         .driver_module  = THIS_MODULE,
 128         .read_raw       = dmard06_read_raw,
 129 };
 130
 131 static int dmard06_probe(struct i2c_client *client,
 132                         const struct i2c_device_id *id)
 133 {
 134         int ret;
 135         struct iio_dev *indio_dev;
 136         struct dmard06_data *dmard06;
 137
 138         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 139                 dev_err(&client->dev, "I2C check functionality failed\n");
 140                 return -ENXIO;
 141         }
 142
 143         indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dmard06));
 144         if (!indio_dev) {
 145                 dev_err(&client->dev, "Failed to allocate iio device\n");
 146                 return -ENOMEM;
 147         }
 148
 149         dmard06 = iio_priv(indio_dev);
 150         dmard06->client = client;
 151
 152         ret = i2c_smbus_read_byte_data(dmard06->client, DMARD06_CHIP_ID_REG);
 153         if (ret < 0) {
 154                 dev_err(&client->dev, "Error reading chip id: %d\n", ret);
 155                 return ret;
 156         }
 157
 158         if (ret != DMARD05_CHIP_ID && ret != DMARD06_CHIP_ID &&
 159             ret != DMARD07_CHIP_ID) {
 160                 dev_err(&client->dev, "Invalid chip id: %02d\n", ret);
 161                 return -ENODEV;
 162         }
 163
 164         dmard06->chip_id = ret;
 165
 166         i2c_set_clientdata(client, indio_dev);
 167         indio_dev->dev.parent = &client->dev;
 168         indio_dev->name = DMARD06_DRV_NAME;
 169         indio_dev->modes = INDIO_DIRECT_MODE;
 170         indio_dev->channels = dmard06_channels;
 171         indio_dev->num_channels = ARRAY_SIZE(dmard06_channels);
 172         indio_dev->info = &dmard06_info;
 173
 174         return devm_iio_device_register(&client->dev, indio_dev);
 175 }
 176
 177 #ifdef CONFIG_PM_SLEEP
 178 static int dmard06_suspend(struct device *dev)
 179 {
 180         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 181         struct dmard06_data *dmard06 = iio_priv(indio_dev);
 182         int ret;
 183
 184         ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
 185                                         DMARD06_MODE_POWERDOWN);
 186         if (ret < 0)
 187                 return ret;
 188
 189         return 0;
 190 }
 191
 192 static int dmard06_resume(struct device *dev)
 193 {
 194         struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 195         struct dmard06_data *dmard06 = iio_priv(indio_dev);
 196         int ret;
 197
 198         ret = i2c_smbus_write_byte_data(dmard06->client, DMARD06_CTRL1_REG,
 199                                         DMARD06_MODE_NORMAL);
 200         if (ret < 0)
 201                 return ret;
 202
 203         return 0;
 204 }
 205
 206 static SIMPLE_DEV_PM_OPS(dmard06_pm_ops, dmard06_suspend, dmard06_resume);
 207 #define DMARD06_PM_OPS (&dmard06_pm_ops)
 208 #else
 209 #define DMARD06_PM_OPS NULL
 210 #endif
 211
 212 static const struct i2c_device_id dmard06_id[] = {
 213         { "dmard05", 0 },
 214         { "dmard06", 0 },
 215         { "dmard07", 0 },
 216         { }
 217 };
 218 MODULE_DEVICE_TABLE(i2c, dmard06_id);
 219
 220 static const struct of_device_id dmard06_of_match[] = {
 221         { .compatible = "domintech,dmard05" },
 222         { .compatible = "domintech,dmard06" },
 223         { .compatible = "domintech,dmard07" },
 224         { }
 225 };
 226 MODULE_DEVICE_TABLE(of, dmard06_of_match);
 227
 228 static struct i2c_driver dmard06_driver = {
 229         .probe = dmard06_probe,
 230         .id_table = dmard06_id,
 231         .driver = {
 232                 .name = DMARD06_DRV_NAME,
 233                 .of_match_table = of_match_ptr(dmard06_of_match),
 234                 .pm = DMARD06_PM_OPS,
 235         },
 236 };
 237 module_i2c_driver(dmard06_driver);
 238
 239 MODULE_AUTHOR("Aleksei Mamlin <mamlinav@gmail.com>");
 240 MODULE_DESCRIPTION("Domintech DMARD06 accelerometer driver");
 241 MODULE_LICENSE("GPL v2");