Userspace tools like iio-sensor-proxy need to know the proximity level that should be considered "near". This value is hardware-specific and can be defined via the devicetree. Allow the driver to export the near level. Signed-off-by: Nikita Travkin <nikita@xxxxxxx> --- The changes are mostly copied from vcnl4000 patchset introducing the property: https://lore.kernel.org/linux-iio/cover.1586094535.git.agx@xxxxxxxxxxx/ --- drivers/iio/light/ltr501.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c index 64ba04c275e8..47d61ec2bb50 100644 --- a/drivers/iio/light/ltr501.c +++ b/drivers/iio/light/ltr501.c @@ -166,6 +166,7 @@ struct ltr501_data { struct regmap_field *reg_ps_rate; struct regmap_field *reg_als_prst; struct regmap_field *reg_ps_prst; + uint32_t near_level; }; static const struct ltr501_samp_table ltr501_als_samp_table[] = { @@ -525,6 +526,25 @@ static int ltr501_write_intr_prst(struct ltr501_data *data, return -EINVAL; } +static ssize_t ltr501_read_near_level(struct iio_dev *indio_dev, + uintptr_t priv, + const struct iio_chan_spec *chan, + char *buf) +{ + struct ltr501_data *data = iio_priv(indio_dev); + + return sprintf(buf, "%u\n", data->near_level); +} + +static const struct iio_chan_spec_ext_info ltr501_ext_info[] = { + { + .name = "nearlevel", + .shared = IIO_SEPARATE, + .read = ltr501_read_near_level, + }, + { /* sentinel */ } +}; + static const struct iio_event_spec ltr501_als_event_spec[] = { { .type = IIO_EV_TYPE_THRESH, @@ -609,6 +629,7 @@ static const struct iio_chan_spec ltr501_channels[] = { }, .event_spec = ltr501_pxs_event_spec, .num_event_specs = ARRAY_SIZE(ltr501_pxs_event_spec), + .ext_info = ltr501_ext_info, }, IIO_CHAN_SOFT_TIMESTAMP(3), }; @@ -1531,6 +1552,10 @@ static int ltr501_probe(struct i2c_client *client, if ((partid >> 4) != data->chip_info->partid) return -ENODEV; + if (device_property_read_u32(&client->dev, "proximity-near-level", + &data->near_level)) + data->near_level = 0; + indio_dev->info = data->chip_info->info; indio_dev->channels = data->chip_info->channels; indio_dev->num_channels = data->chip_info->no_channels; -- 2.30.2
