[PATCH v2] iio: max5487: Add support for Maxim digital potentiometers

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Add implementation for Maxim MAX5487, MAX5488, MAX5489
digital potentiometers.

Datasheet:
http://datasheets.maximintegrated.com/en/ds/MAX5487-MAX5489.pdf

Signed-off-by: Cristina Moraru <cristina.moraru09@xxxxxxxxx>
CC: Daniel Baluta <daniel.baluta@xxxxxxxxx>
---
Changes since v1:
        Fix spacing
        Eliminate max5487_cfg struct
        Add kohms as driver data
 drivers/iio/potentiometer/Kconfig   |  11 +++
 drivers/iio/potentiometer/Makefile  |   1 +
 drivers/iio/potentiometer/max5487.c | 169 ++++++++++++++++++++++++++++++++++++
 3 files changed, 181 insertions(+)
 create mode 100644 drivers/iio/potentiometer/max5487.c

diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig
index fd75db7..242c62d 100644
--- a/drivers/iio/potentiometer/Kconfig
+++ b/drivers/iio/potentiometer/Kconfig
@@ -5,6 +5,17 @@
 
 menu "Digital potentiometers"
 
+config MAX5487
+        tristate "Maxim MAX5487/MAX5488/MAX5489  Digital Potentiometer driver"
+        depends on SPI
+        help
+          Say yes here to build support for the Maxim
+          MAX5487, MAX5488, MAX5489 digital potentiomenter
+          chips.
+
+          To compile this driver as a module, choose M here: the
+          module will be called max5487.
+
 config MCP4531
 	tristate "Microchip MCP45xx/MCP46xx Digital Potentiometer driver"
 	depends on I2C
diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile
index 8afe492..bc2dfd8 100644
--- a/drivers/iio/potentiometer/Makefile
+++ b/drivers/iio/potentiometer/Makefile
@@ -3,4 +3,5 @@
 #
 
 # When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_MAX5487) += max5487.o
 obj-$(CONFIG_MCP4531) += mcp4531.o
diff --git a/drivers/iio/potentiometer/max5487.c b/drivers/iio/potentiometer/max5487.c
new file mode 100644
index 0000000..fa455b8
--- /dev/null
+++ b/drivers/iio/potentiometer/max5487.c
@@ -0,0 +1,169 @@
+/*
+ * max5487.c - Support for MAX5487, MAX5488, MAX5489 digital potentiometers
+ *
+ * Copyright (C) Cristina-Gabriela Moraru <cristina.moraru09@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/acpi.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/sysfs.h>
+#include <linux/iio/iio.h>
+
+#define MAX5487_DRV_NAME "max5487"
+
+#define MAX5487_WRITE_WIPER_A	0x01
+#define MAX5487_WRITE_WIPER_B	0x02
+
+/* copy both wiper regs to NV regs */
+#define MAX5487_COPY_AB_TO_NV	0x23
+/* copy both NV regs to wiper regs */
+#define MAX5487_COPY_NV_TO_AB	0x33
+
+#define MAX5487_MAX_POS		255
+
+struct max5487_data {
+	struct regmap *regmap;
+	int kohms;
+};
+
+#define MAX5487_CHANNEL(ch, addr) {				\
+	.type = IIO_RESISTANCE,					\
+	.indexed = 1,						\
+	.output = 1,						\
+	.channel = ch,						\
+	.address = addr,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+}
+
+static const struct iio_chan_spec max5487_channels[] = {
+	MAX5487_CHANNEL(0, MAX5487_WRITE_WIPER_A),
+	MAX5487_CHANNEL(1, MAX5487_WRITE_WIPER_B),
+};
+
+static int max5487_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long mask)
+{
+	struct max5487_data *data = iio_priv(indio_dev);
+
+	if (mask != IIO_CHAN_INFO_SCALE)
+		return -EINVAL;
+
+	*val = 1000 * data->kohms;
+	*val2 = MAX5487_MAX_POS;
+	return IIO_VAL_FRACTIONAL;
+}
+
+static int max5487_write_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan,
+			     int val, int val2, long mask)
+{
+	struct max5487_data *data = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (val < 0 || val > MAX5487_MAX_POS)
+			return -EINVAL;
+		return regmap_write(data->regmap, chan->address, val);
+	default:
+		return -EINVAL;
+	}
+	return -EINVAL;
+}
+
+static const struct iio_info max5487_info = {
+	.read_raw = &max5487_read_raw,
+	.write_raw = &max5487_write_raw,
+	.driver_module = THIS_MODULE,
+};
+
+static const struct regmap_config max5487_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = MAX5487_COPY_NV_TO_AB,
+};
+
+static int max5487_spi_probe(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev;
+	struct max5487_data *data;
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	dev_set_drvdata(&spi->dev, indio_dev);
+	data = iio_priv(indio_dev);
+
+	data->regmap = devm_regmap_init_spi(spi, &max5487_regmap_config);
+	if (IS_ERR(data->regmap))
+		return PTR_ERR(data->regmap);
+
+	data->kohms = id->driver_data;
+
+	indio_dev->info = &max5487_info;
+	indio_dev->name = id->name;
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = max5487_channels;
+	indio_dev->num_channels = ARRAY_SIZE(max5487_channels);
+
+	/* restore both wiper regs from NV regs */
+	ret = regmap_write(data->regmap, MAX5487_COPY_NV_TO_AB, 0);
+	if (ret < 0)
+		return ret;
+
+	return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static int max5487_spi_remove(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev);
+	struct max5487_data *data = iio_priv(indio_dev);
+
+	/* save both wiper regs to NV regs */
+	return regmap_write(data->regmap, MAX5487_COPY_AB_TO_NV, 0);
+}
+
+static const struct spi_device_id max5487_id[] = {
+	{ "MAX5487", 10 },
+	{ "MAX5488", 50 },
+	{ "MAX5489", 100 },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, max5487_id);
+
+static const struct acpi_device_id max5487_acpi_match[] = {
+	{ "MAX5487", 10 },
+	{ "MAX5488", 50 },
+	{ "MAX5489", 100 },
+	{ },
+};
+MODULE_DEVICE_TABLE(acpi, max5487_acpi_match);
+
+static struct spi_driver max5487_driver = {
+	.driver = {
+		.name = MAX5487_DRV_NAME,
+		.owner = THIS_MODULE,
+		.acpi_match_table = ACPI_PTR(max5487_acpi_match),
+	},
+	.id_table = max5487_id,
+	.probe = max5487_spi_probe,
+	.remove = max5487_spi_remove
+};
+module_spi_driver(max5487_driver);
+
+MODULE_AUTHOR("Cristina-Gabriela Moraru <cristina.moraru09@xxxxxxxxx>");
+MODULE_DESCRIPTION("max5487 SPI driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

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