From: Julien Stephan <jstephan@baylibre.com>
To: "Lars-Peter Clausen" <lars@metafoo.de>,
"Michael Hennerich" <Michael.Hennerich@analog.com>,
"Nuno Sá" <nuno.sa@analog.com>,
"David Lechner" <dlechner@baylibre.com>,
"Jonathan Cameron" <jic23@kernel.org>,
"Rob Herring" <robh+dt@kernel.org>,
"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Liam Girdwood" <lgirdwood@gmail.com>,
"Mark Brown" <broonie@kernel.org>
Cc: linux-iio@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com>,
Julien Stephan <jstephan@baylibre.com>
Subject: [PATCH v5 4/7] iio: adc: ad7380: add support for pseudo-differential parts
Date: Tue, 19 Mar 2024 11:11:25 +0100 [thread overview]
Message-ID: <20240319-adding-new-ad738x-driver-v5-4-ce7df004ceb3@baylibre.com> (raw)
In-Reply-To: <20240319-adding-new-ad738x-driver-v5-0-ce7df004ceb3@baylibre.com>
From: David Lechner <dlechner@baylibre.com>
Add support for AD7383, AD7384 pseudo-differential compatible parts.
Pseudo differential parts require common mode voltage supplies so add
the support for them and add the support of IIO_CHAN_INFO_OFFSET to
retrieve the offset
Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Julien Stephan <jstephan@baylibre.com>
---
drivers/iio/adc/ad7380.c | 98 +++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 85 insertions(+), 13 deletions(-)
diff --git a/drivers/iio/adc/ad7380.c b/drivers/iio/adc/ad7380.c
index caf6deb3a8b1..996ca83feaed 100644
--- a/drivers/iio/adc/ad7380.c
+++ b/drivers/iio/adc/ad7380.c
@@ -7,6 +7,7 @@
*
* Datasheets of supported parts:
* ad7380/1 : https://www.analog.com/media/en/technical-documentation/data-sheets/AD7380-7381.pdf
+ * ad7383/4 : https://www.analog.com/media/en/technical-documentation/data-sheets/ad7383-7384.pdf
*/
#include <linux/bitfield.h>
@@ -68,16 +69,19 @@ struct ad7380_chip_info {
const char *name;
const struct iio_chan_spec *channels;
unsigned int num_channels;
+ const char * const *vcm_supplies;
+ unsigned int num_vcm_supplies;
};
-#define AD7380_CHANNEL(index, bits) { \
+#define AD7380_CHANNEL(index, bits, diff) { \
.type = IIO_VOLTAGE, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ ((diff) ? 0 : BIT(IIO_CHAN_INFO_OFFSET)), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.indexed = 1, \
- .differential = 1, \
- .channel = 2 * (index), \
- .channel2 = 2 * (index) + 1, \
+ .differential = (diff), \
+ .channel = (diff) ? (2 * (index)) : (index), \
+ .channel2 = (diff) ? (2 * (index) + 1) : 0, \
.scan_index = (index), \
.scan_type = { \
.sign = 's', \
@@ -87,15 +91,23 @@ struct ad7380_chip_info {
}, \
}
-#define DEFINE_AD7380_2_CHANNEL(name, bits) \
-static const struct iio_chan_spec name[] = { \
- AD7380_CHANNEL(0, bits), \
- AD7380_CHANNEL(1, bits), \
- IIO_CHAN_SOFT_TIMESTAMP(2), \
+#define DEFINE_AD7380_2_CHANNEL(name, bits, diff) \
+static const struct iio_chan_spec name[] = { \
+ AD7380_CHANNEL(0, bits, diff), \
+ AD7380_CHANNEL(1, bits, diff), \
+ IIO_CHAN_SOFT_TIMESTAMP(2), \
}
-DEFINE_AD7380_2_CHANNEL(ad7380_channels, 16);
-DEFINE_AD7380_2_CHANNEL(ad7381_channels, 14);
+/* fully differential */
+DEFINE_AD7380_2_CHANNEL(ad7380_channels, 16, 1);
+DEFINE_AD7380_2_CHANNEL(ad7381_channels, 14, 1);
+/* pseudo differential */
+DEFINE_AD7380_2_CHANNEL(ad7383_channels, 16, 0);
+DEFINE_AD7380_2_CHANNEL(ad7384_channels, 14, 0);
+
+static const char * const ad7380_2_channel_vcm_supplies[] = {
+ "aina", "ainb",
+};
/* Since this is simultaneous sampling, we don't allow individual channels. */
static const unsigned long ad7380_2_channel_scan_masks[] = {
@@ -115,11 +127,28 @@ static const struct ad7380_chip_info ad7381_chip_info = {
.num_channels = ARRAY_SIZE(ad7381_channels),
};
+static const struct ad7380_chip_info ad7383_chip_info = {
+ .name = "ad7383",
+ .channels = ad7383_channels,
+ .num_channels = ARRAY_SIZE(ad7383_channels),
+ .vcm_supplies = ad7380_2_channel_vcm_supplies,
+ .num_vcm_supplies = ARRAY_SIZE(ad7380_2_channel_vcm_supplies),
+};
+
+static const struct ad7380_chip_info ad7384_chip_info = {
+ .name = "ad7384",
+ .channels = ad7384_channels,
+ .num_channels = ARRAY_SIZE(ad7384_channels),
+ .vcm_supplies = ad7380_2_channel_vcm_supplies,
+ .num_vcm_supplies = ARRAY_SIZE(ad7380_2_channel_vcm_supplies),
+};
+
struct ad7380_state {
const struct ad7380_chip_info *chip_info;
struct spi_device *spi;
struct regmap *regmap;
unsigned int vref_mv;
+ unsigned int vcm_mv[2];
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
@@ -304,6 +333,11 @@ static int ad7380_read_raw(struct iio_dev *indio_dev,
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
+ case IIO_CHAN_INFO_OFFSET:
+ *val = st->vcm_mv[chan->channel] * (1 << chan->scan_type.realbits)
+ / st->vref_mv;
+
+ return IIO_VAL_INT;
}
return -EINVAL;
@@ -350,7 +384,7 @@ static int ad7380_probe(struct spi_device *spi)
struct iio_dev *indio_dev;
struct ad7380_state *st;
struct regulator *vref;
- int ret;
+ int ret, i;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
@@ -394,6 +428,40 @@ static int ad7380_probe(struct spi_device *spi)
st->vref_mv = AD7380_INTERNAL_REF_MV;
}
+ if (st->chip_info->num_vcm_supplies > ARRAY_SIZE(st->vcm_mv))
+ return dev_err_probe(&spi->dev, -EINVAL,
+ "invalid number of VCM supplies\n");
+
+ /*
+ * pseudo-differential chips have common mode supplies for the negative
+ * input pin.
+ */
+ for (i = 0; i < st->chip_info->num_vcm_supplies; i++) {
+ struct regulator *vcm;
+
+ vcm = devm_regulator_get_optional(&spi->dev,
+ st->chip_info->vcm_supplies[i]);
+ if (IS_ERR(vcm))
+ return dev_err_probe(&spi->dev, PTR_ERR(vcm),
+ "Failed to get %s regulator\n",
+ st->chip_info->vcm_supplies[i]);
+
+ ret = regulator_enable(vcm);
+ if (ret)
+ return ret;
+
+ ret = devm_add_action_or_reset(&spi->dev,
+ ad7380_regulator_disable, vcm);
+ if (ret)
+ return ret;
+
+ ret = regulator_get_voltage(vcm);
+ if (ret < 0)
+ return ret;
+
+ st->vcm_mv[i] = ret / 1000;
+ }
+
st->regmap = devm_regmap_init(&spi->dev, NULL, st, &ad7380_regmap_config);
if (IS_ERR(st->regmap))
return dev_err_probe(&spi->dev, PTR_ERR(st->regmap),
@@ -422,12 +490,16 @@ static int ad7380_probe(struct spi_device *spi)
static const struct of_device_id ad7380_of_match_table[] = {
{ .compatible = "adi,ad7380", .data = &ad7380_chip_info },
{ .compatible = "adi,ad7381", .data = &ad7381_chip_info },
+ { .compatible = "adi,ad7383", .data = &ad7383_chip_info },
+ { .compatible = "adi,ad7384", .data = &ad7384_chip_info },
{ }
};
static const struct spi_device_id ad7380_id_table[] = {
{ "ad7380", (kernel_ulong_t)&ad7380_chip_info },
{ "ad7381", (kernel_ulong_t)&ad7381_chip_info },
+ { "ad7383", (kernel_ulong_t)&ad7383_chip_info },
+ { "ad7384", (kernel_ulong_t)&ad7384_chip_info },
{ }
};
MODULE_DEVICE_TABLE(spi, ad7380_id_table);
--
2.44.0
next prev parent reply other threads:[~2024-03-19 10:11 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-19 10:11 [PATCH v5 0/7] iio: adc: add new ad7380 driver Julien Stephan
2024-03-19 10:11 ` [PATCH v5 1/7] dt-bindings: iio: adc: Add binding for AD7380 ADCs Julien Stephan
2024-03-19 10:11 ` [PATCH v5 2/7] iio: adc: ad7380: new driver " Julien Stephan
2024-03-24 12:42 ` Jonathan Cameron
2024-03-19 10:11 ` [PATCH v5 3/7] dt-bindings: iio: adc: ad7380: add pseudo-differential parts Julien Stephan
2024-03-19 17:10 ` Conor Dooley
2024-03-19 10:11 ` Julien Stephan [this message]
2024-03-24 13:01 ` [PATCH v5 4/7] iio: adc: ad7380: add support for " Jonathan Cameron
2024-03-25 14:08 ` David Lechner
2024-03-25 20:06 ` Jonathan Cameron
2024-03-25 20:14 ` David Lechner
2024-03-19 10:11 ` [PATCH v5 5/7] iio: adc: ad7380: prepare for parts with more channels Julien Stephan
2024-03-24 13:07 ` Jonathan Cameron
2024-03-19 10:11 ` [PATCH v5 6/7] dt-bindings: iio: adc: ad7380: add support for ad738x-4 4 channels variants Julien Stephan
2024-03-19 17:24 ` Conor Dooley
2024-03-19 10:11 ` [PATCH v5 7/7] " Julien Stephan
2024-03-24 13:10 ` Jonathan Cameron
2024-03-25 15:01 ` David Lechner
2024-03-25 19:04 ` Jonathan Cameron
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