iio: magn: bmc150_magn: add oversampling ratio
Export the oversampling ratio so that the user can change the number of repetions for x/y/z axis. The sampling frequency is limited by the oversampling ratio. The available sampling frequencies might change depending on the values of oversampling_ratio. The specification can be downloaded from: http://ae-bst.resource.bosch.com/media/products/dokumente/bmc150/BST-BMC150-DS000-04.pdf. Signed-off-by: Irina Tirdea <irina.tirdea@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Irina Tirdea
Jonathan Cameron
Родитель
faaa44955d
Коммит
5990dc9703
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@ -146,6 +146,7 @@ struct bmc150_magn_data {
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s32 buffer[6];
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struct iio_trigger *dready_trig;
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bool dready_trigger_on;
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int max_odr;
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};
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static const struct {
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@ -323,6 +324,43 @@ static int bmc150_magn_set_odr(struct bmc150_magn_data *data, int val)
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return -EINVAL;
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}
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static int bmc150_magn_set_max_odr(struct bmc150_magn_data *data, int rep_xy,
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int rep_z, int odr)
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{
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int ret, reg_val, max_odr;
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if (rep_xy <= 0) {
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ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY,
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®_val);
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if (ret < 0)
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return ret;
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rep_xy = BMC150_MAGN_REGVAL_TO_REPXY(reg_val);
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}
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if (rep_z <= 0) {
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ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z,
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®_val);
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if (ret < 0)
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return ret;
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rep_z = BMC150_MAGN_REGVAL_TO_REPZ(reg_val);
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}
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if (odr <= 0) {
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ret = bmc150_magn_get_odr(data, &odr);
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if (ret < 0)
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return ret;
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}
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/* the maximum selectable read-out frequency from datasheet */
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max_odr = 1000000 / (145 * rep_xy + 500 * rep_z + 980);
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if (odr > max_odr) {
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dev_err(&data->client->dev,
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"Can't set oversampling with sampling freq %d\n",
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odr);
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return -EINVAL;
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}
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data->max_odr = max_odr;
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return 0;
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}
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static s32 bmc150_magn_compensate_x(struct bmc150_magn_trim_regs *tregs, s16 x,
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u16 rhall)
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{
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@ -422,7 +460,7 @@ static int bmc150_magn_read_raw(struct iio_dev *indio_dev,
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int *val, int *val2, long mask)
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{
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struct bmc150_magn_data *data = iio_priv(indio_dev);
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int ret;
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int ret, tmp;
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s32 values[AXIS_XYZ_MAX];
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switch (mask) {
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@ -467,6 +505,26 @@ static int bmc150_magn_read_raw(struct iio_dev *indio_dev,
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if (ret < 0)
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return ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
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switch (chan->channel2) {
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case IIO_MOD_X:
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case IIO_MOD_Y:
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ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_XY,
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&tmp);
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if (ret < 0)
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return ret;
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*val = BMC150_MAGN_REGVAL_TO_REPXY(tmp);
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return IIO_VAL_INT;
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case IIO_MOD_Z:
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ret = regmap_read(data->regmap, BMC150_MAGN_REG_REP_Z,
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&tmp);
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if (ret < 0)
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return ret;
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*val = BMC150_MAGN_REGVAL_TO_REPZ(tmp);
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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default:
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return -EINVAL;
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}
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@ -481,10 +539,50 @@ static int bmc150_magn_write_raw(struct iio_dev *indio_dev,
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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if (val > data->max_odr)
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return -EINVAL;
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mutex_lock(&data->mutex);
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ret = bmc150_magn_set_odr(data, val);
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mutex_unlock(&data->mutex);
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return ret;
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case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
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switch (chan->channel2) {
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case IIO_MOD_X:
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case IIO_MOD_Y:
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if (val < 1 || val > 511)
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return -EINVAL;
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mutex_lock(&data->mutex);
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ret = bmc150_magn_set_max_odr(data, val, 0, 0);
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if (ret < 0) {
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mutex_unlock(&data->mutex);
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return ret;
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}
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ret = regmap_update_bits(data->regmap,
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BMC150_MAGN_REG_REP_XY,
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0xFF,
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BMC150_MAGN_REPXY_TO_REGVAL
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(val));
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mutex_unlock(&data->mutex);
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return ret;
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case IIO_MOD_Z:
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if (val < 1 || val > 256)
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return -EINVAL;
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mutex_lock(&data->mutex);
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ret = bmc150_magn_set_max_odr(data, 0, val, 0);
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if (ret < 0) {
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mutex_unlock(&data->mutex);
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return ret;
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}
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ret = regmap_update_bits(data->regmap,
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BMC150_MAGN_REG_REP_Z,
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0xFF,
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BMC150_MAGN_REPZ_TO_REGVAL
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(val));
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mutex_unlock(&data->mutex);
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return ret;
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default:
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return -EINVAL;
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}
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default:
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return -EINVAL;
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}
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@ -501,10 +599,31 @@ static int bmc150_magn_validate_trigger(struct iio_dev *indio_dev,
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return 0;
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}
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("2 6 8 10 15 20 25 30");
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static ssize_t bmc150_magn_show_samp_freq_avail(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct bmc150_magn_data *data = iio_priv(indio_dev);
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size_t len = 0;
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u8 i;
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for (i = 0; i < ARRAY_SIZE(bmc150_magn_samp_freq_table); i++) {
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if (bmc150_magn_samp_freq_table[i].freq > data->max_odr)
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break;
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len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
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bmc150_magn_samp_freq_table[i].freq);
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}
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/* replace last space with a newline */
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buf[len - 1] = '\n';
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return len;
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}
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static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(bmc150_magn_show_samp_freq_avail);
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static struct attribute *bmc150_magn_attributes[] = {
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
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NULL,
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};
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@ -516,7 +635,8 @@ static const struct attribute_group bmc150_magn_attrs_group = {
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.type = IIO_MAGN, \
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.modified = 1, \
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.channel2 = IIO_MOD_##_axis, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
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BIT(IIO_CHAN_INFO_SCALE), \
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.scan_index = AXIS_##_axis, \
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@ -616,6 +736,11 @@ static int bmc150_magn_init(struct bmc150_magn_data *data)
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goto err_poweroff;
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}
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ret = bmc150_magn_set_max_odr(data, preset.rep_xy, preset.rep_z,
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preset.odr);
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if (ret < 0)
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goto err_poweroff;
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ret = bmc150_magn_set_power_mode(data, BMC150_MAGN_POWER_MODE_NORMAL,
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true);
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if (ret < 0) {
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