diff options
| author | Akinobu Mita <akinobu.mita@gmail.com> | 2018-06-25 18:22:42 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2018-06-30 20:27:27 +0300 |
| commit | 732238e22e4c5497bd76d02adcf5c4fcba6dcb67 (patch) | |
| tree | d616cd736458012782adeb6b35f56c30e1344aa2 /drivers/iio | |
| parent | 9048f1f18a70a01eaa3c8e7166fdb2538929d780 (diff) | |
| download | linux-732238e22e4c5497bd76d02adcf5c4fcba6dcb67.tar.xz | |
iio: accel: adxl345: add calibration offset support
The ADXL345 provides the offset adjustment registers for each axis.
This adds the iio channel information for the calibraion offsets with
that feature.
Cc: Eva Rachel Retuya <eraretuya@gmail.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/accel/adxl345_core.c | 41 |
1 files changed, 40 insertions, 1 deletions
diff --git a/drivers/iio/accel/adxl345_core.c b/drivers/iio/accel/adxl345_core.c index 7a25840d806f..7b29ae8375e9 100644 --- a/drivers/iio/accel/adxl345_core.c +++ b/drivers/iio/accel/adxl345_core.c @@ -18,6 +18,10 @@ #include "adxl345.h" #define ADXL345_REG_DEVID 0x00 +#define ADXL345_REG_OFSX 0x1e +#define ADXL345_REG_OFSY 0x1f +#define ADXL345_REG_OFSZ 0x20 +#define ADXL345_REG_OFS_AXIS(index) (ADXL345_REG_OFSX + (index)) #define ADXL345_REG_POWER_CTL 0x2D #define ADXL345_REG_DATA_FORMAT 0x31 #define ADXL345_REG_DATAX0 0x32 @@ -56,7 +60,8 @@ struct adxl345_data { .modified = 1, \ .channel2 = IIO_MOD_##axis, \ .address = index, \ - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_CALIBBIAS), \ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ } @@ -72,6 +77,7 @@ static int adxl345_read_raw(struct iio_dev *indio_dev, { struct adxl345_data *data = iio_priv(indio_dev); __le16 accel; + unsigned int regval; int ret; switch (mask) { @@ -94,6 +100,38 @@ static int adxl345_read_raw(struct iio_dev *indio_dev, *val2 = adxl345_uscale; return IIO_VAL_INT_PLUS_MICRO; + case IIO_CHAN_INFO_CALIBBIAS: + ret = regmap_read(data->regmap, + ADXL345_REG_OFS_AXIS(chan->address), ®val); + if (ret < 0) + return ret; + /* + * 8-bit resolution at +/- 2g, that is 4x accel data scale + * factor + */ + *val = sign_extend32(regval, 7) * 4; + + return IIO_VAL_INT; + } + + return -EINVAL; +} + +static int adxl345_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct adxl345_data *data = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_CALIBBIAS: + /* + * 8-bit resolution at +/- 2g, that is 4x accel data scale + * factor + */ + return regmap_write(data->regmap, + ADXL345_REG_OFS_AXIS(chan->address), + val / 4); } return -EINVAL; @@ -101,6 +139,7 @@ static int adxl345_read_raw(struct iio_dev *indio_dev, static const struct iio_info adxl345_info = { .read_raw = adxl345_read_raw, + .write_raw = adxl345_write_raw, }; int adxl345_core_probe(struct device *dev, struct regmap *regmap, |