1 files changed, 119 insertions, 0 deletions
diff --git a/drivers/iio/dac/ad5686-spi.c b/drivers/iio/dac/ad5686-spi.c
new file mode 100644
index 000000000..1df9143f5
--- /dev/null
+++ b/drivers/iio/dac/ad5686-spi.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * AD5672R, AD5676, AD5676R, AD5681R, AD5682R, AD5683, AD5683R,
+ * AD5684, AD5684R, AD5685R, AD5686, AD5686R
+ * Digital to analog converters driver
+ *
+ * Copyright 2018 Analog Devices Inc.
+ */
+
+#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);
+	u8 tx_len, *buf;
+
+	switch (st->chip_info->regmap_type) {
+	case AD5683_REGMAP:
+		st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
+					      AD5683_DATA(val));
+		buf = &st->data[0].d8[1];
+		tx_len = 3;
+		break;
+	case AD5686_REGMAP:
+		st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
+					      AD5686_ADDR(addr) |
+					      val);
+		buf = &st->data[0].d8[1];
+		tx_len = 3;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return spi_write(spi, buf, tx_len);
+}
+
+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);
+	u8 cmd = 0;
+	int ret;
+
+	if (st->chip_info->regmap_type == AD5686_REGMAP)
+		cmd = AD5686_CMD_READBACK_ENABLE;
+	else if (st->chip_info->regmap_type == AD5683_REGMAP)
+		cmd = AD5686_CMD_READBACK_ENABLE_V2;
+
+	st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
+				      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},
+	{"ad5681r", ID_AD5681R},
+	{"ad5682r", ID_AD5682R},
+	{"ad5683", ID_AD5683},
+	{"ad5683r", ID_AD5683R},
+	{"ad5684", ID_AD5684},
+	{"ad5684r", ID_AD5684R},
+	{"ad5685", ID_AD5685R}, /* Does not exist */
+	{"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 <stefan.popa@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD5686 and similar multi-channel DACs");
+MODULE_LICENSE("GPL v2");