Date:   Sat, 11 Aug 2018 22:02:24 +0200
From:   Marcus Folkesson <marcus.folkesson@...il.com>
To:     Marcus Folkesson <marcus.folkesson@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] iio: dac: add support for ltc166x

LTC1665/LTC1660 is a 8/10-bit Digital-to-Analog Converter
(DAC) with eight individual channels.

Signed-off-by: Marcus Folkesson <marcus.folkesson@...il.com>
---
 drivers/iio/dac/Kconfig   |  10 ++
 drivers/iio/dac/Makefile  |   1 +
 drivers/iio/dac/ltc166x.c | 244 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 255 insertions(+)
 create mode 100644 drivers/iio/dac/ltc166x.c

diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index 76db0768e454..04cfa6bb9dc1 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -120,6 +120,16 @@ config AD5624R_SPI
 	  Say yes here to build support for Analog Devices AD5624R, AD5644R and
 	  AD5664R converters (DAC). This driver uses the common SPI interface.
 
+config LTC166X
+	tristate "Linear Technology LTC1660/LTC1665 DAC SPI driver"
+	depends on SPI
+	help
+	  Say yes here to build support for Linear Technology
+	  LTC1660 and LTC1665 Digital to Analog Converters.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ltc166x.
+
 config LTC2632
 	tristate "Linear Technology LTC2632-12/10/8 DAC spi driver"
 	depends on SPI
diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
index 81e710ed7491..380749c87c26 100644
--- a/drivers/iio/dac/Makefile
+++ b/drivers/iio/dac/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_CIO_DAC) += cio-dac.o
 obj-$(CONFIG_DPOT_DAC) += dpot-dac.o
 obj-$(CONFIG_DS4424) += ds4424.o
 obj-$(CONFIG_LPC18XX_DAC) += lpc18xx_dac.o
+obj-$(CONFIG_LTC166X) += ltc166x.o
 obj-$(CONFIG_LTC2632) += ltc2632.o
 obj-$(CONFIG_M62332) += m62332.o
 obj-$(CONFIG_MAX517) += max517.o
diff --git a/drivers/iio/dac/ltc166x.c b/drivers/iio/dac/ltc166x.c
new file mode 100644
index 000000000000..0031f2b50f14
--- /dev/null
+++ b/drivers/iio/dac/ltc166x.c
@@ -0,0 +1,244 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Linear Technology LTC1665/LTC1660, 8 channels DAC
+ *
+ * Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@...il.com>
+ */
+#include <linux/bitops.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#define LTC166X_REG_WAKE	0x0
+#define LTC166X_REG_DAC_A	0x1
+#define LTC166X_REG_DAC_B	0x2
+#define LTC166X_REG_DAC_C	0x3
+#define LTC166X_REG_DAC_D	0x4
+#define LTC166X_REG_DAC_E	0x5
+#define LTC166X_REG_DAC_F	0x6
+#define LTC166X_REG_DAC_G	0x7
+#define LTC166X_REG_DAC_H	0x8
+#define LTC166X_REG_SLEEP	0xe
+
+#define LTC166X_NUM_CHANNELS	8
+
+static const struct regmap_config ltc166x_regmap_config = {
+	.reg_bits = 4,
+	.val_bits = 12,
+};
+
+enum ltc166x_supported_device_ids {
+	ID_LTC1660,
+	ID_LTC1665,
+};
+
+struct ltc166x_priv {
+	struct spi_device *spi;
+	struct regmap *regmap;
+	struct regulator *vref_reg;
+	unsigned int value[LTC166X_NUM_CHANNELS];
+	unsigned int vref_mv;
+};
+
+static int ltc166x_read_raw(struct iio_dev *indio_dev,
+		struct iio_chan_spec const *chan,
+		int *val,
+		int *val2,
+		long mask)
+{
+	struct ltc166x_priv *priv = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		*val = priv->value[chan->channel];
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		*val = priv->vref_mv;
+		*val2 = chan->scan_type.realbits;
+		return IIO_VAL_FRACTIONAL_LOG2;
+	default:
+		return -EINVAL;
+	}
+}
+
+static int ltc166x_write_raw(struct iio_dev *indio_dev,
+		struct iio_chan_spec const *chan,
+		int val,
+		int val2,
+		long mask)
+{
+	struct ltc166x_priv *priv = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		if (val2 != 0)
+			return -EINVAL;
+		if (val > GENMASK(chan->scan_type.realbits-1, 0))
+			return -EINVAL;
+		priv->value[chan->channel] = val;
+		val <<= chan->scan_type.shift;
+		return regmap_write(priv->regmap, chan->channel, val);
+	default:
+		return -EINVAL;
+	}
+}
+
+#define LTC166X_CHAN(chan, bits) {			\
+	.type = IIO_VOLTAGE,				\
+	.indexed = 1,					\
+	.output = 1,					\
+	.channel = chan,				\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
+	.scan_type = {					\
+		.sign = 'u',				\
+		.realbits = (bits),			\
+		.storagebits = 16,			\
+		.shift = 12 - (bits),			\
+	},						\
+}
+
+#define  LTC166X_OCTAL_CHANNELS(bits) {			\
+		LTC166X_CHAN(LTC166X_REG_DAC_A, bits),	\
+		LTC166X_CHAN(LTC166X_REG_DAC_B, bits),	\
+		LTC166X_CHAN(LTC166X_REG_DAC_C, bits),	\
+		LTC166X_CHAN(LTC166X_REG_DAC_D, bits),	\
+		LTC166X_CHAN(LTC166X_REG_DAC_E, bits),	\
+		LTC166X_CHAN(LTC166X_REG_DAC_F, bits),	\
+		LTC166X_CHAN(LTC166X_REG_DAC_G, bits),	\
+		LTC166X_CHAN(LTC166X_REG_DAC_H, bits),	\
+}
+
+static const struct iio_chan_spec ltc166x_channels[][LTC166X_NUM_CHANNELS] = {
+	[ID_LTC1660] = LTC166X_OCTAL_CHANNELS(10),
+	[ID_LTC1665] = LTC166X_OCTAL_CHANNELS(8),
+};
+
+static const struct iio_info ltc166x_info = {
+	.read_raw = &ltc166x_read_raw,
+	.write_raw = &ltc166x_write_raw,
+};
+
+static int __maybe_unused ltc166x_suspend(struct device *dev)
+{
+	struct ltc166x_priv *priv = iio_priv(spi_get_drvdata(
+						to_spi_device(dev)));
+	return regmap_write(priv->regmap, LTC166X_REG_SLEEP, 0x00);
+}
+
+static int __maybe_unused ltc166x_resume(struct device *dev)
+{
+	struct ltc166x_priv *priv = iio_priv(spi_get_drvdata(
+						to_spi_device(dev)));
+	return regmap_write(priv->regmap, LTC166X_REG_WAKE, 0x00);
+}
+static SIMPLE_DEV_PM_OPS(ltc166x_pm_ops, ltc166x_suspend, ltc166x_resume);
+
+static int ltc166x_probe(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev;
+	struct ltc166x_priv *priv;
+	const struct spi_device_id *id = spi_get_device_id(spi);
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*priv));
+	if (indio_dev == NULL)
+		return -ENOMEM;
+
+	priv = iio_priv(indio_dev);
+	priv->regmap = devm_regmap_init_spi(spi, &ltc166x_regmap_config);
+	if (IS_ERR(priv->regmap)) {
+		dev_err(&spi->dev, "failed to register spi regmap %ld\n",
+			PTR_ERR(priv->regmap));
+		return PTR_ERR(priv->regmap);
+	}
+
+	priv->vref_reg = devm_regulator_get(&spi->dev, "vref");
+	if (IS_ERR(priv->vref_reg)) {
+		dev_err(&spi->dev, "vref regulator not specified\n");
+		return PTR_ERR(priv->vref_reg);
+	}
+
+	ret = regulator_enable(priv->vref_reg);
+	if (ret) {
+		dev_err(&spi->dev, "failed to enable vref regulator: %d\n",
+				ret);
+		return ret;
+	}
+
+	ret = regulator_get_voltage(priv->vref_reg);
+	if (ret < 0) {
+		dev_err(&spi->dev, "failed to read vref regulator: %d\n",
+				ret);
+		goto error_disable_reg;
+	}
+	priv->vref_mv = ret / 1000;
+
+	priv->spi = spi;
+	spi_set_drvdata(spi, indio_dev);
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->info = &ltc166x_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = ltc166x_channels[id->driver_data];
+	indio_dev->num_channels = LTC166X_NUM_CHANNELS;
+	indio_dev->name = id->name;
+
+	ret = iio_device_register(indio_dev);
+	if (ret) {
+		dev_err(&spi->dev, "failed to register iio device: %d\n",
+				ret);
+		goto error_disable_reg;
+	}
+
+	return 0;
+
+error_disable_reg:
+	regulator_disable(priv->vref_reg);
+
+	return ret;
+}
+
+static int ltc166x_remove(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev = spi_get_drvdata(spi);
+	struct ltc166x_priv *priv = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+	regulator_disable(priv->vref_reg);
+
+	return 0;
+}
+
+static const struct of_device_id ltc166x_dt_ids[] = {
+	{ .compatible = "lltc,ltc1660", .data = (void *)ID_LTC1660 },
+	{ .compatible = "lltc,ltc1665", .data = (void *)ID_LTC1665 },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ltc166x_dt_ids);
+
+static const struct spi_device_id ltc166x_id[] = {
+	{"ltc1660", ID_LTC1660},
+	{"ltc1665", ID_LTC1665},
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(spi, ltc166x_id);
+
+static struct spi_driver ltc166x_driver = {
+	.driver = {
+		.name = "ltc166x",
+		.of_match_table = ltc166x_dt_ids,
+		.pm = &ltc166x_pm_ops,
+	},
+	.probe	= ltc166x_probe,
+	.remove = ltc166x_remove,
+	.id_table = ltc166x_id,
+};
+module_spi_driver(ltc166x_driver);
+
+MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@...il.com>");
+MODULE_DESCRIPTION("Linear Technology LTC166X DAC");
+MODULE_LICENSE("GPL v2");
-- 
2.11.0.rc2

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