Signed-off-by: Alban Bedel <alban.bedel@xxxxxxxxxxxxxxxxx>
---
.../bindings/staging/iio/adc/lpc32xx-adc.txt | 6 ++++
drivers/staging/iio/adc/lpc32xx_adc.c | 30 +++++++++++++++++++-
2 files changed, 35 insertions(+), 1 deletions(-)
diff --git a/Documentation/devicetree/bindings/staging/iio/adc/lpc32xx-adc.txt b/Documentation/devicetree/bindings/staging/iio/adc/lpc32xx-adc.txt
index b3629d3..515c128 100644
--- a/Documentation/devicetree/bindings/staging/iio/adc/lpc32xx-adc.txt
+++ b/Documentation/devicetree/bindings/staging/iio/adc/lpc32xx-adc.txt
@@ -6,6 +6,11 @@ Required properties:
region.
- interrupts: The ADC interrupt
+Optional properties:
+- reference-voltages: the 3 reference voltages value (in mV) to use
+ for scaling. If not given or 0 a scaling factor of 1 is used.
+- offsets: the 3 offsets to add to the raw value before scaling.
+
Example:
adc@40048000 {
@@ -13,4 +18,5 @@ Example:
reg = <0x40048000 0x1000>;
interrupt-parent = <&mic>;
interrupts = <39 0>;
+ reference-voltages = <5000>, <3300>, <1200>;
};
diff --git a/drivers/staging/iio/adc/lpc32xx_adc.c b/drivers/staging/iio/adc/lpc32xx_adc.c
index 10c5962..aaa23ac 100644
--- a/drivers/staging/iio/adc/lpc32xx_adc.c
+++ b/drivers/staging/iio/adc/lpc32xx_adc.c
@@ -64,6 +64,8 @@ struct lpc32xx_adc_info {
struct completion completion;
u32 value;
+ u32 ref_voltage[3];
+ u32 offset[3];
};
static int lpc32xx_read_raw(struct iio_dev *indio_dev,
@@ -91,6 +93,26 @@ static int lpc32xx_read_raw(struct iio_dev *indio_dev,
return IIO_VAL_INT;
}
+ if (mask == IIO_CHAN_INFO_SCALE) {
+ if (info->ref_voltage[chan->channel]) {
+ unsigned factor;
+ factor = div_u64((u64)info->ref_voltage[chan->channel] *
+ (u64)1000000,
+ ADC_VALUE_MASK);
+ *val = factor / 1000000;
+ *val2 = factor % 1000000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ } else {
+ *val = 1;
+ return IIO_VAL_INT;
+ }
+ }
+
+ if (mask == IIO_CHAN_INFO_OFFSET) {
+ *val = info->offset[chan->channel];
+ return IIO_VAL_INT;
+ }
+
return -EINVAL;
}
@@ -103,7 +125,9 @@ static const struct iio_info lpc32xx_adc_iio_info = {
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = _index, \
- .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, \
+ .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
+ IIO_CHAN_INFO_SCALE_SEPARATE_BIT | \
+ IIO_CHAN_INFO_OFFSET_SEPARATE_BIT, \
.address = AD_IN * _index, \
.scan_index = _index, \
}
@@ -149,6 +173,10 @@ static int __devinit lpc32xx_adc_probe(struct platform_device *pdev)
}
info = iio_priv(iodev);
+ of_property_read_u32_array(pdev->dev.of_node, "reference-voltages",
+ info->ref_voltage, ARRAY_SIZE(info->ref_voltage));
+ of_property_read_u32_array(pdev->dev.of_node, "offsets",
+ info->offset, ARRAY_SIZE(info->offset));
info->adc_base = ioremap(res->start, resource_size(res));
if (!info->adc_base) {
--
1.7.0.4
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