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Message-Id: <20220704090050.3289572-5-Naresh.Solanki@9elements.com>
Date: Mon, 4 Jul 2022 11:00:48 +0200
From: Naresh Solanki <naresh.solanki@...ements.com>
To: linux-kernel@...r.kernel.org
Cc: Patrick Rudolph <patrick.rudolph@...ements.com>,
Naresh Solanki <Naresh.Solanki@...ements.com>
Subject: [PATCH 4/5] iio: max597x: Add support for max597x
From: Patrick Rudolph <patrick.rudolph@...ements.com>
max597x has 10bit ADC for voltage & current monitoring.
Use iio framework to expose the same in sysfs.
Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
---
drivers/iio/adc/Kconfig | 9 ++
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/max597x-iio.c | 156 ++++++++++++++++++++++++++++++++++
3 files changed, 166 insertions(+)
create mode 100644 drivers/iio/adc/max597x-iio.c
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 48ace7412874..d4676eefb60f 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -683,6 +683,15 @@ config MAX1363
To compile this driver as a module, choose M here: the module will be
called max1363.
+config MAX597X_IIO
+ tristate "Maxim 597x power switch and monitor"
+ depends on I2C
+ depends on OF
+ select MFD_MAX597X
+ help
+ This driver exposes Maxim 5970/5978 voltage/current monitoring
+ interface using iio framework.
+
config MAX9611
tristate "Maxim max9611/max9612 ADC driver"
depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 39d806f6d457..f8cb5a30a946 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_MAX11100) += max11100.o
obj-$(CONFIG_MAX1118) += max1118.o
obj-$(CONFIG_MAX1241) += max1241.o
obj-$(CONFIG_MAX1363) += max1363.o
+obj-$(CONFIG_MAX597X_IIO) += max597x-iio.o
obj-$(CONFIG_MAX9611) += max9611.o
obj-$(CONFIG_MCP320X) += mcp320x.o
obj-$(CONFIG_MCP3422) += mcp3422.o
diff --git a/drivers/iio/adc/max597x-iio.c b/drivers/iio/adc/max597x-iio.c
new file mode 100644
index 000000000000..de0ea762c5c8
--- /dev/null
+++ b/drivers/iio/adc/max597x-iio.c
@@ -0,0 +1,156 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Device driver for regulators in MAX5970 and MAX5978 IC
+ *
+ * Copyright (c) 2022 9elements GmbH
+ *
+ * Author: Patrick Rudolph <patrick.rudolph@...ements.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/iio/iio.h>
+#include <linux/of.h>
+#include <linux/i2c.h>
+#include <linux/mfd/max597x.h>
+#include <linux/regmap.h>
+#include <linux/version.h>
+#include <linux/platform_device.h>
+
+struct max597x_iio {
+ struct regmap *regmap;
+ int shunt_micro_ohms[MAX5970_NUM_SWITCHES];
+ unsigned int irng[MAX5970_NUM_SWITCHES];
+ unsigned int mon_rng[MAX5970_NUM_SWITCHES];
+};
+
+#define MAX597X_ADC_CHANNEL(_idx, _type) { \
+ .type = IIO_ ## _type, \
+ .indexed = 1, \
+ .channel = (_idx), \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
+ BIT(IIO_CHAN_INFO_SCALE), \
+ .address = MAX5970_REG_ ## _type ## _L(_idx), \
+}
+
+static const struct iio_chan_spec max5978_adc_iio_channels[] = {
+ MAX597X_ADC_CHANNEL(0, VOLTAGE),
+ MAX597X_ADC_CHANNEL(0, CURRENT),
+};
+
+static const struct iio_chan_spec max5970_adc_iio_channels[] = {
+ MAX597X_ADC_CHANNEL(0, VOLTAGE),
+ MAX597X_ADC_CHANNEL(0, CURRENT),
+ MAX597X_ADC_CHANNEL(1, VOLTAGE),
+ MAX597X_ADC_CHANNEL(1, CURRENT),
+};
+
+static int max597x_iio_read_raw(struct iio_dev *iio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long info)
+{
+ int ret;
+ struct max597x_iio *data = iio_priv(iio_dev);
+ unsigned int reg_l, reg_h;
+
+ switch (info) {
+ case IIO_CHAN_INFO_RAW:
+ ret = regmap_read(data->regmap, chan->address, ®_l);
+ if (ret < 0)
+ return ret;
+ ret = regmap_read(data->regmap, chan->address - 1, ®_h);
+ if (ret < 0)
+ return ret;
+ *val = (reg_h << 2) | (reg_l & 3);
+
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+
+ switch (chan->address) {
+ case MAX5970_REG_CURRENT_L(0):
+ fallthrough;
+ case MAX5970_REG_CURRENT_L(1):
+ /* in A, convert to mA */
+ *val = data->irng[chan->channel] * 1000;
+ *val2 =
+ data->shunt_micro_ohms[chan->channel] * ADC_MASK;
+ return IIO_VAL_FRACTIONAL;
+
+ case MAX5970_REG_VOLTAGE_L(0):
+ fallthrough;
+ case MAX5970_REG_VOLTAGE_L(1):
+ /* in uV, convert to mV */
+ *val = data->mon_rng[chan->channel];
+ *val2 = ADC_MASK * 1000;
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ break;
+ }
+ return -EINVAL;
+}
+
+static const struct iio_info max597x_adc_iio_info = {
+ .read_raw = &max597x_iio_read_raw,
+};
+
+static int max597x_iio_probe(struct platform_device *pdev)
+{
+ struct max597x_data *max597x = dev_get_drvdata(pdev->dev.parent);
+ struct iio_dev *indio_dev;
+ struct max597x_iio *priv;
+ int ret, i;
+
+ /* registering iio */
+ indio_dev = devm_iio_device_alloc(max597x->dev, sizeof(*priv));
+ if (!indio_dev) {
+ dev_err(max597x->dev, "failed allocating iio device\n");
+ return -ENOMEM;
+ }
+ indio_dev->name = dev_name(max597x->dev);
+ indio_dev->info = &max597x_adc_iio_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ switch (max597x->num_switches) {
+ case MAX597x_TYPE_MAX5970:
+ indio_dev->channels = max5970_adc_iio_channels;
+ indio_dev->num_channels = ARRAY_SIZE(max5970_adc_iio_channels);
+ break;
+ case MAX597x_TYPE_MAX5978:
+ indio_dev->channels = max5978_adc_iio_channels;
+ indio_dev->num_channels = ARRAY_SIZE(max5978_adc_iio_channels);
+ break;
+ }
+
+ priv = iio_priv(indio_dev);
+ priv->regmap = max597x->regmap;
+ for (i = 0; i < indio_dev->num_channels; i++) {
+ priv->irng[i] = max597x->irng[i];
+ priv->mon_rng[i] = max597x->mon_rng[i];
+ priv->shunt_micro_ohms[i] = max597x->shunt_micro_ohms[i];
+ }
+
+ ret = devm_iio_device_register(max597x->dev, indio_dev);
+ if (ret)
+ dev_err(max597x->dev, "could not register iio device");
+
+ return ret;
+
+}
+
+static struct platform_driver max597x_iio_driver = {
+ .driver = {
+ .name = "max597x-iio",
+ },
+ .probe = max597x_iio_probe,
+};
+
+module_platform_driver(max597x_iio_driver);
+
+
+MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@...ements.com>");
+MODULE_DESCRIPTION("MAX5970_hot-swap controller driver");
+MODULE_LICENSE("GPL v2");
--
2.35.3
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