The AD7940 is a single channel 14 bit ADC similar to the ADCs already supported
by the ad7476 driver, but it does have a different shift factor.
Signed-off-by: Lars-Peter Clausen <lars@xxxxxxxxxx>
---
drivers/iio/adc/Kconfig | 4 ++--
drivers/iio/adc/ad7476.c | 18 ++++++++++++++----
2 files changed, 16 insertions(+), 6 deletions(-)
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 364d2d7..7152a49 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -25,8 +25,8 @@ config AD7476
select IIO_TRIGGERED_BUFFER
help
Say yes here to build support for Analog Devices AD7475, AD7476, AD7477,
- AD7478, AD7466, AD7467, AD7468, AD7495, AD7910, AD7920 SPI analog to
- digital converters (ADC).
+ AD7478, AD7466, AD7467, AD7468, AD7495, AD7910, AD7920, AD7920 SPI analog
+ to digital converters (ADC).
If unsure, say N (but it's safe to say "Y").
diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c
index 1c7ae6f..646df45 100644
--- a/drivers/iio/adc/ad7476.c
+++ b/drivers/iio/adc/ad7476.c
@@ -48,7 +48,8 @@ enum ad7476_supported_device_ids {
ID_AD7466,
ID_AD7467,
ID_AD7468,
- ID_AD7495
+ ID_AD7495,
+ ID_AD7940,
};
#if IS_ENABLED(CONFIG_IIO_BUFFER)
@@ -152,7 +153,7 @@ static int ad7476_read_raw(struct iio_dev *indio_dev,
return -EINVAL;
}
-#define AD7476_CHAN(bits) \
+#define _AD7476_CHAN(bits, _shift) \
{ \
.type = IIO_VOLTAGE, \
.indexed = 1, \
@@ -160,12 +161,16 @@ static int ad7476_read_raw(struct iio_dev *indio_dev,
IIO_CHAN_INFO_SCALE_SHARED_BIT, \
.scan_type = { \
.sign = 'u', \
- .realbits = bits, \
+ .realbits = (bits), \
.storagebits = 16, \
- .shift = 13 - bits, \
+ .shift = (_shift), \
+ .endianness = IIO_BE, \
}, \
}
+#define AD7476_CHAN(bits) _AD7476_CHAN((bits), 13 - (bits))
+#define AD7940_CHAN(bits) _AD7476_CHAN((bits), 15 - (bits))
+
static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
[ID_AD7466] = {
.channel[0] = AD7476_CHAN(12),
@@ -184,6 +189,10 @@ static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
.int_vref_uv = 2500000,
},
+ [ID_AD7940] = {
+ .channel[0] = AD7940_CHAN(14),
+ .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+ },
};
static const struct iio_info ad7476_info = {
@@ -284,6 +293,7 @@ static const struct spi_device_id ad7476_id[] = {
{"ad7495", ID_AD7495},
{"ad7910", ID_AD7467},
{"ad7920", ID_AD7466},
+ {"ad7940", ID_AD7940},
{}
};
MODULE_DEVICE_TABLE(spi, ad7476_id);
--
1.7.10.4
--
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