linux-kernel - [PATCH v2 9/9] iio: adc: ad7606: Add support for writing registers when using backend

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Message-Id: <20241210-ad7606_add_iio_backend_software_mode-v2-9-6619c3e50d81@baylibre.com>
Date: Tue, 10 Dec 2024 10:46:49 +0000
From: Guillaume Stols <gstols@...libre.com>
To: Lars-Peter Clausen <lars@...afoo.de>, 
 Michael Hennerich <Michael.Hennerich@...log.com>, 
 Jonathan Cameron <jic23@...nel.org>, Nuno Sa <nuno.sa@...log.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>, 
 linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Michael Hennerich <michael.hennerich@...log.com>, 
 devicetree@...r.kernel.org, dlechner@...libre.com, jstephan@...libre.com, 
 aardelean@...libre.com, adureghello@...libre.com, 
 Guillaume Stols <gstols@...libre.com>
Subject: [PATCH v2 9/9] iio: adc: ad7606: Add support for writing registers
 when using backend

Adds the logic for effectively enabling the software mode for the
iio-backend, i.e enabling the software mode channel configuration and
implementing the register writing functions.

Signed-off-by: Guillaume Stols <gstols@...libre.com>
---
 drivers/iio/adc/ad7606.h     | 15 ++++++++++++
 drivers/iio/adc/ad7606_par.c | 56 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)

diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h
index ada8065fba4e..9da39c2d5d53 100644
--- a/drivers/iio/adc/ad7606.h
+++ b/drivers/iio/adc/ad7606.h
@@ -96,6 +96,21 @@
 		BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),  \
 		0, 0, 16)
 
+#define AD7606_BI_SW_CHANNEL(num)			\
+	AD760X_CHANNEL(num,				\
+		/* mask separate */			\
+		BIT(IIO_CHAN_INFO_SCALE),		\
+		/* mask type */				\
+		0,					\
+		/* mask all */				\
+		BIT(IIO_CHAN_INFO_SAMP_FREQ) |		\
+		BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
+		/* mask separate available */		\
+		BIT(IIO_CHAN_INFO_SCALE),		\
+		/* mask all available */		\
+		BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),	\
+		16)
+
 struct ad7606_state;
 
 typedef int (*ad7606_scale_setup_cb_t)(struct iio_dev *indio_dev,
diff --git a/drivers/iio/adc/ad7606_par.c b/drivers/iio/adc/ad7606_par.c
index 64733b607aa8..c159cd4f7802 100644
--- a/drivers/iio/adc/ad7606_par.c
+++ b/drivers/iio/adc/ad7606_par.c
@@ -13,12 +13,14 @@
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
+#include <linux/pwm.h>
 #include <linux/types.h>
 
 #include <linux/iio/backend.h>
 #include <linux/iio/iio.h>
 
 #include "ad7606.h"
+#include "ad7606_bi.h"
 
 static const struct iio_chan_spec ad7606b_bi_channels[] = {
 	AD7606_BI_CHANNEL(0),
@@ -31,6 +33,17 @@ static const struct iio_chan_spec ad7606b_bi_channels[] = {
 	AD7606_BI_CHANNEL(7),
 };
 
+static const struct iio_chan_spec ad7606b_bi_sw_channels[] = {
+	AD7606_BI_SW_CHANNEL(0),
+	AD7606_BI_SW_CHANNEL(1),
+	AD7606_BI_SW_CHANNEL(2),
+	AD7606_BI_SW_CHANNEL(3),
+	AD7606_BI_SW_CHANNEL(4),
+	AD7606_BI_SW_CHANNEL(5),
+	AD7606_BI_SW_CHANNEL(6),
+	AD7606_BI_SW_CHANNEL(7),
+};
+
 static int ad7606_bi_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask)
 {
 	struct ad7606_state *st = iio_priv(indio_dev);
@@ -86,9 +99,52 @@ static int ad7606_bi_setup_iio_backend(struct device *dev, struct iio_dev *indio
 	return 0;
 }
 
+static int ad7606_bi_reg_read(struct iio_dev *indio_dev, unsigned int addr)
+{
+	struct ad7606_state *st = iio_priv(indio_dev);
+	int val, ret;
+	struct ad7606_platform_data *pdata =  st->dev->platform_data;
+
+	iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
+		ret = pdata->bus_reg_read(st->back,
+					addr,
+					&val);
+	}
+	if (ret < 0)
+		return ret;
+
+	return val;
+}
+
+static int ad7606_bi_reg_write(struct iio_dev *indio_dev,
+			       unsigned int addr,
+			       unsigned int val)
+{
+	struct ad7606_state *st = iio_priv(indio_dev);
+	struct ad7606_platform_data *pdata =  st->dev->platform_data;
+	int ret;
+
+	iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
+	ret = pdata->bus_reg_write(st->back,
+					addr,
+					val);
+	}
+	return ret;
+}
+
+static int ad7606_bi_sw_mode_config(struct iio_dev *indio_dev)
+{
+	indio_dev->channels = ad7606b_bi_sw_channels;
+
+	return 0;
+}
+
 static const struct ad7606_bus_ops ad7606_bi_bops = {
 	.iio_backend_config = ad7606_bi_setup_iio_backend,
 	.update_scan_mode = ad7606_bi_update_scan_mode,
+	.reg_read = ad7606_bi_reg_read,
+	.reg_write = ad7606_bi_reg_write,
+	.sw_mode_config = ad7606_bi_sw_mode_config,
 };
 
 static int ad7606_par16_read_block(struct device *dev,

-- 
2.34.1