The unit and interpretation of the raw IR value is unspecified.
Signed-off-by: Vianney le Clément de Saint-Marcq <vianney.leclement@xxxxxxxxxxxxx>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@xxxxxxx>
---
This patch is a RFC. The raw IR value could be used to implement custom
signal processing in userspace if sampled at a high enough rate. Not
sure whether it is relevant for mainline though.
---
drivers/iio/temperature/mlx90614.c | 40 ++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c
index 49c517a..b3771c5 100644
--- a/drivers/iio/temperature/mlx90614.c
+++ b/drivers/iio/temperature/mlx90614.c
@@ -214,6 +214,36 @@ static int mlx90614_read_raw(struct iio_dev *indio_dev,
}
}
+static ssize_t mlx90614_read_raw_ir(struct iio_dev *indio_dev,
+ uintptr_t priv,
+ struct iio_chan_spec const *channel,
+ char *buf)
+{
+ struct mlx90614_data *data = iio_priv(indio_dev);
+ u8 cmd;
+ s32 ret;
+
+ switch (channel->channel) {
+ case 0:
+ cmd = MLX90614_RAW1;
+ break;
+ case 1:
+ cmd = MLX90614_RAW2;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ mlx90614_power_get(data, true);
+ ret = i2c_smbus_read_word_data(data->client, cmd);
+ mlx90614_power_put(data);
+
+ if (ret < 0)
+ return ret;
+
+ return scnprintf(buf, PAGE_SIZE, "0x%04x\n", ret);
+}
+
static ssize_t mlx90614_show_emissivity(struct device *dev,
struct device_attribute *devattr,
char *buf)
@@ -318,6 +348,14 @@ out:
return count;
}
+static const struct iio_chan_spec_ext_info mlx90614_channel_obj_ext[] = {
+ {
+ .name = "raw_ir",
+ .read = mlx90614_read_raw_ir,
+ },
+ { }
+};
+
static const struct iio_chan_spec mlx90614_channels[] = {
{
.type = IIO_TEMP,
@@ -336,6 +374,7 @@ static const struct iio_chan_spec mlx90614_channels[] = {
BIT(IIO_CHAN_INFO_PROCESSED),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE),
+ .ext_info = mlx90614_channel_obj_ext,
},
{
.type = IIO_TEMP,
@@ -358,6 +397,7 @@ static const struct iio_chan_spec mlx90614_channels[] = {
BIT(IIO_CHAN_INFO_PROCESSED),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE),
+ .ext_info = mlx90614_channel_obj_ext,
},
};
--
2.3.0
--
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