diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/accel/adxl372.c | 74 |
1 files changed, 73 insertions, 1 deletions
diff --git a/drivers/iio/accel/adxl372.c b/drivers/iio/accel/adxl372.c index 5a039ba0b3eb..6281e4a11632 100644 --- a/drivers/iio/accel/adxl372.c +++ b/drivers/iio/accel/adxl372.c @@ -223,7 +223,8 @@ static const struct adxl372_axis_lookup adxl372_axis_lookup_table[] = { .modified = 1, \ .channel2 = IIO_MOD_##axis, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \ + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ + BIT(IIO_CHAN_INFO_SAMP_FREQ), \ .scan_index = index, \ .scan_type = { \ .sign = 's', \ @@ -311,6 +312,19 @@ static int adxl372_set_odr(struct adxl372_state *st, return ret; } +static int adxl372_find_closest_match(const int *array, + unsigned int size, int val) +{ + int i; + + for (i = 0; i < size; i++) { + if (val <= array[i]) + return i; + } + + return size - 1; +} + static int adxl372_set_bandwidth(struct adxl372_state *st, enum adxl372_bandwidth bw) { @@ -631,6 +645,51 @@ static int adxl372_read_raw(struct iio_dev *indio_dev, *val = 0; *val2 = ADXL372_USCALE; return IIO_VAL_INT_PLUS_MICRO; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = adxl372_samp_freq_tbl[st->odr]; + return IIO_VAL_INT; + } + + return -EINVAL; +} + +static int adxl372_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long info) +{ + struct adxl372_state *st = iio_priv(indio_dev); + int odr_index, ret; + + switch (info) { + case IIO_CHAN_INFO_SAMP_FREQ: + odr_index = adxl372_find_closest_match(adxl372_samp_freq_tbl, + ARRAY_SIZE(adxl372_samp_freq_tbl), + val); + ret = adxl372_set_odr(st, odr_index); + if (ret < 0) + return ret; + /* + * The timer period depends on the ODR selected. + * At 3200 Hz and below, it is 6.6 ms; at 6400 Hz, it is 3.3 ms + */ + ret = adxl372_set_activity_time_ms(st, st->act_time_ms); + if (ret < 0) + return ret; + /* + * The timer period depends on the ODR selected. + * At 3200 Hz and below, it is 26 ms; at 6400 Hz, it is 13 ms + */ + ret = adxl372_set_inactivity_time_ms(st, st->inact_time_ms); + if (ret < 0) + return ret; + /* + * The maximum bandwidth is constrained to at most half of + * the ODR to ensure that the Nyquist criteria is not violated + */ + if (st->bw > odr_index) + ret = adxl372_set_bandwidth(st, odr_index); + + return ret; default: return -EINVAL; } @@ -778,9 +837,22 @@ static const struct iio_trigger_ops adxl372_trigger_ops = { .set_trigger_state = adxl372_dready_trig_set_state, }; +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("400 800 1600 3200 6400"); + +static struct attribute *adxl372_attributes[] = { + &iio_const_attr_sampling_frequency_available.dev_attr.attr, + NULL, +}; + +static const struct attribute_group adxl372_attrs_group = { + .attrs = adxl372_attributes, +}; + static const struct iio_info adxl372_info = { .validate_trigger = &adxl372_validate_trigger, + .attrs = &adxl372_attrs_group, .read_raw = adxl372_read_raw, + .write_raw = adxl372_write_raw, .debugfs_reg_access = &adxl372_reg_access, .hwfifo_set_watermark = adxl372_set_watermark, }; |