iio: dac: Add support for AD5676R/AD5696R DACs

drivers/iio/dac/Kconfig

@@ -129,16 +129,32 @@ config AD5624R_SPI
 	  AD5664R converters (DAC). This driver uses the common SPI interface.
 
 config AD5686
-	tristate "Analog Devices AD5686R/AD5685R/AD5684R DAC SPI driver"
+	tristate
+
+config AD5686_SPI
+	tristate "Analog Devices AD5686 and similar multi-channel DACs (SPI)"
 	depends on SPI
+	select AD5686
 	help
-	  Say yes here to build support for Analog Devices AD5686R, AD5685R,
-	  AD5684R, AD5791 Voltage Output Digital to
-	  Analog Converter.
+	  Say yes here to build support for Analog Devices AD5672R, AD5676, 
+	  AD5676R, AD5684, AD5684R, AD5684R, AD5685R, AD5686, AD5686R 
+	  Voltage Output Digital to Analog Converter.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad5686.
 
+config AD5696_I2C
+	tristate "Analog Devices AD5696 and similar multi-channel DACs (I2C)"
+	depends on I2C
+	select AD5686
+	help
+	  Say yes here to build support for Analog Devices AD5671R, AD5675R, 
+	  AD5694, AD5694R, AD5695R, AD5696, AD5696R Voltage Output Digital to
+	  Analog Converter.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad5696.
+
 config AD5755
 	tristate "Analog Devices AD5755/AD5755-1/AD5757/AD5735/AD5737 DAC driver"
 	depends on SPI_MASTER

drivers/iio/dac/ad5686-spi.c

@@ -0,0 +1,93 @@
+/*
+ * AD5672R, AD5676, AD5676R, AD5684, AD5684R, AD5684R, AD5685R, AD5686, AD5686R
+ * Digital to analog converters driver
+ *
+ * Copyright 2018 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include "ad5686.h"
+
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+
+static int ad5686_spi_write(struct ad5686_state *st,
+			    u8 cmd, u8 addr, u16 val)
+{
+	struct spi_device *spi = to_spi_device(st->dev);
+
+	st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
+				      AD5686_ADDR(addr) |
+				      val);
+
+	return spi_write(spi, &st->data[0].d8[1], 3);
+}
+
+static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
+{
+	struct spi_transfer t[] = {
+		{
+			.tx_buf = &st->data[0].d8[1],
+			.len = 3,
+			.cs_change = 1,
+		}, {
+			.tx_buf = &st->data[1].d8[1],
+			.rx_buf = &st->data[2].d8[1],
+			.len = 3,
+		},
+	};
+	struct spi_device *spi = to_spi_device(st->dev);
+	int ret;
+
+	st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_READBACK_ENABLE) |
+				      AD5686_ADDR(addr));
+	st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP));
+
+	ret = spi_sync_transfer(spi, t, ARRAY_SIZE(t));
+	if (ret < 0)
+		return ret;
+
+	return be32_to_cpu(st->data[2].d32);
+}
+
+static int ad5686_spi_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+
+	return ad5686_probe(&spi->dev, id->driver_data, id->name,
+			    ad5686_spi_write, ad5686_spi_read);
+}
+
+static int ad5686_spi_remove(struct spi_device *spi)
+{
+	return ad5686_remove(&spi->dev);
+}
+
+static const struct spi_device_id ad5686_spi_id[] = {
+	{"ad5672r", ID_AD5672R},
+	{"ad5676", ID_AD5676},
+	{"ad5676r", ID_AD5676R},
+	{"ad5684", ID_AD5684},
+	{"ad5684r", ID_AD5684R},
+	{"ad5685r", ID_AD5685R},
+	{"ad5686", ID_AD5686},
+	{"ad5686r", ID_AD5686R},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, ad5686_spi_id);
+
+static struct spi_driver ad5686_spi_driver = {
+	.driver = {
+		.name = "ad5686",
+	},
+	.probe = ad5686_spi_probe,
+	.remove = ad5686_spi_remove,
+	.id_table = ad5686_spi_id,
+};
+
+module_spi_driver(ad5686_spi_driver);
+
+MODULE_AUTHOR("Stefan Popa <[email protected]>");
+MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
+MODULE_LICENSE("GPL v2");