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Message-ID: <20250820120247.3012-5-Ioana.Risteiu@analog.com>
Date: Wed, 20 Aug 2025 15:02:45 +0300
From: Ioana Risteiu <Ioana.Risteiu@...log.com>
To: Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich
<Michael.Hennerich@...log.com>,
Jonathan Cameron <jic23@...nel.org>,
"David
Lechner" <dlechner@...libre.com>,
Nuno Sá
<nuno.sa@...log.com>,
Andy Shevchenko <andy@...nel.org>, Rob Herring
<robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley
<conor+dt@...nel.org>,
Ramona Nechita <ramona.nechita@...log.com>,
<linux-iio@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
CC: Ioana Risteiu <Ioana.Risteiu@...log.com>
Subject: [PATCH v4 4/4] iio: adc: update ad7779 to use IIO backend
Add a new functionality to ad7779 driver that streams data through data
output interface using IIO backend interface.
Signed-off-by: Ioana Risteiu <Ioana.Risteiu@...log.com>
---
changes in v4:
- grouped includes in alphabetical order
- reordered fields in struct ad7779_state
- modified logic of setting the number of lanes
- validating devicetree value
drivers/iio/adc/ad7779.c | 116 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 115 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/adc/ad7779.c b/drivers/iio/adc/ad7779.c
index f7e681c0e8c0..adca490061c9 100644
--- a/drivers/iio/adc/ad7779.c
+++ b/drivers/iio/adc/ad7779.c
@@ -25,6 +25,7 @@
#include <linux/units.h>
#include <linux/iio/iio.h>
+#include <linux/iio/backend.h>
#include <linux/iio/buffer.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
@@ -116,6 +117,12 @@
#define AD7779_CRC8_POLY 0x07
DECLARE_CRC8_TABLE(ad7779_crc8_table);
+enum ad7779_data_lines {
+ AD7779_1LINE = 1,
+ AD7779_2LINES = 2,
+ AD7779_4LINES = 4,
+};
+
enum ad7779_filter {
AD7779_SINC3,
AD7779_SINC5,
@@ -145,6 +152,7 @@ struct ad7779_state {
struct completion completion;
unsigned int sampling_freq;
enum ad7779_filter filter_enabled;
+ struct iio_backend *back;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
@@ -630,12 +638,38 @@ static int ad7779_reset(struct iio_dev *indio_dev, struct gpio_desc *reset_gpio)
return ret;
}
+static int ad7779_update_scan_mode(struct iio_dev *indio_dev,
+ const unsigned long *scan_mask)
+{
+ struct ad7779_state *st = iio_priv(indio_dev);
+ unsigned int c;
+ int ret;
+
+ for (c = 0; c < AD7779_NUM_CHANNELS; c++) {
+ if (test_bit(c, scan_mask))
+ ret = iio_backend_chan_enable(st->back, c);
+ else
+ ret = iio_backend_chan_disable(st->back, c);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
static const struct iio_info ad7779_info = {
.read_raw = ad7779_read_raw,
.write_raw = ad7779_write_raw,
.debugfs_reg_access = &ad7779_reg_access,
};
+static const struct iio_info ad7779_info_data = {
+ .read_raw = ad7779_read_raw,
+ .write_raw = ad7779_write_raw,
+ .debugfs_reg_access = &ad7779_reg_access,
+ .update_scan_mode = &ad7779_update_scan_mode,
+};
+
static const struct iio_enum ad7779_filter_enum = {
.items = ad7779_filter_type,
.num_items = ARRAY_SIZE(ad7779_filter_type),
@@ -752,6 +786,49 @@ static int ad7779_conf(struct ad7779_state *st, struct gpio_desc *start_gpio)
return 0;
}
+static int ad7779_set_data_lines(struct iio_dev *indio_dev,
+ unsigned int num_lanes)
+{
+ struct ad7779_state *st = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ if (num_lanes != AD7779_1LINE &&
+ num_lanes != AD7779_2LINES &&
+ num_lanes != AD7779_4LINES)
+ return ret;
+
+ ret = ad7779_set_sampling_frequency(st, num_lanes * AD7779_DEFAULT_SAMPLING_1LINE);
+ if (ret)
+ return ret;
+
+ ret = iio_backend_num_lanes_set(st->back, num_lanes);
+ if (ret)
+ return ret;
+
+ return ad7779_spi_write_mask(st, AD7779_REG_DOUT_FORMAT,
+ AD7779_DOUT_FORMAT_MSK,
+ FIELD_PREP(AD7779_DOUT_FORMAT_MSK, 2 - ilog2(num_lanes)));
+}
+
+static int ad7779_setup_channels(struct iio_dev *indio_dev, const struct ad7779_state *st)
+{
+ struct iio_chan_spec *channels;
+ struct device *dev = &st->spi->dev;
+
+ channels = devm_kmemdup_array(dev, st->chip_info->channels,
+ ARRAY_SIZE(ad7779_channels),
+ sizeof(*channels), GFP_KERNEL);
+ if (!channels)
+ return -ENOMEM;
+
+ for (int i = 0; i < ARRAY_SIZE(ad7779_channels); i++)
+ channels[i].scan_type.endianness = IIO_CPU;
+
+ indio_dev->channels = channels;
+
+ return 0;
+}
+
static int ad7779_setup_without_backend(struct ad7779_state *st, struct iio_dev *indio_dev)
{
int ret;
@@ -796,6 +873,39 @@ static int ad7779_setup_without_backend(struct ad7779_state *st, struct iio_dev
FIELD_PREP(AD7779_DCLK_CLK_DIV_MSK, 7));
}
+static int ad7779_setup_backend(struct ad7779_state *st, struct iio_dev *indio_dev)
+{
+ struct device *dev = &st->spi->dev;
+ int ret = -EINVAL;
+ int num_lanes;
+
+ indio_dev->info = &ad7779_info_data;
+
+ ret = ad7779_setup_channels(indio_dev, st);
+ if (ret)
+ return ret;
+
+ st->back = devm_iio_backend_get(dev, NULL);
+ if (IS_ERR(st->back))
+ return dev_err_probe(dev, PTR_ERR(st->back),
+ "failed to get iio backend");
+
+ ret = devm_iio_backend_request_buffer(dev, st->back, indio_dev);
+ if (ret)
+ return ret;
+
+ ret = devm_iio_backend_enable(dev, st->back);
+ if (ret)
+ return ret;
+
+ num_lanes = 4;
+ ret = device_property_read_u32(dev, "adi,num-lanes", &num_lanes);
+ if (ret && ret != -EINVAL)
+ return ret;
+
+ return ad7779_set_data_lines(indio_dev, num_lanes);
+}
+
static int ad7779_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
@@ -848,7 +958,10 @@ static int ad7779_probe(struct spi_device *spi)
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->num_channels = ARRAY_SIZE(ad7779_channels);
- ret = ad7779_setup_without_backend(st, indio_dev);
+ if (device_property_present(dev, "io-backends"))
+ ret = ad7779_setup_backend(st, indio_dev);
+ else
+ ret = ad7779_setup_without_backend(st, indio_dev);
if (ret)
return ret;
@@ -943,3 +1056,4 @@ module_spi_driver(ad7779_driver);
MODULE_AUTHOR("Ramona Alexandra Nechita <ramona.nechita@...log.com>");
MODULE_DESCRIPTION("Analog Devices AD7779 ADC");
MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS("IIO_BACKEND");
--
2.47.2
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