1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/iio/dac/ad5446.h b/drivers/iio/dac/ad5446.h
new file mode 100644
index 000000000000..6ba31d98f415
--- /dev/null
+++ b/drivers/iio/dac/ad5446.h
@@ -0,0 +1,77 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_AD5446_H
+#define _LINUX_AD5446_H
+
+#include <linux/bits.h>
+#include <linux/compiler.h>
+#include <linux/iio/iio.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+
+struct device;
+
+extern const struct iio_chan_spec_ext_info ad5446_ext_info_powerdown[];
+
+#define _AD5446_CHANNEL(bits, storage, _shift, ext) { \
+	.type = IIO_VOLTAGE, \
+	.indexed = 1, \
+	.output = 1, \
+	.channel = 0, \
+	.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 = (storage), \
+		.shift = (_shift), \
+		}, \
+	.ext_info = (ext), \
+}
+
+#define AD5446_CHANNEL(bits, storage, shift) \
+	_AD5446_CHANNEL(bits, storage, shift, NULL)
+
+#define AD5446_CHANNEL_POWERDOWN(bits, storage, shift) \
+	_AD5446_CHANNEL(bits, storage, shift, ad5446_ext_info_powerdown)
+
+/**
+ * struct ad5446_state - driver instance specific data
+ * @dev:		this device
+ * @chip_info:		chip model specific constants, available modes etc
+ * @vref_mv:		actual reference voltage used
+ * @cached_val:		store/retrieve values during power down
+ * @pwr_down_mode:	power down mode (1k, 100k or tristate)
+ * @pwr_down:		true if the device is in power down
+ * @lock:		lock to protect the data buffer during write ops
+ */
+struct ad5446_state {
+	struct device *dev;
+	const struct ad5446_chip_info *chip_info;
+	unsigned short vref_mv;
+	unsigned int cached_val;
+	unsigned int pwr_down_mode;
+	unsigned int pwr_down;
+	/* mutex to protect device shared data */
+	struct mutex lock;
+	union {
+		__be16 d16;
+		u8 d24[3];
+	} __aligned(IIO_DMA_MINALIGN);
+};
+
+/**
+ * struct ad5446_chip_info - chip specific information
+ * @channel:		channel spec for the DAC
+ * @int_vref_mv:	AD5620/40/60: the internal reference voltage
+ * @write:		chip specific helper function to write to the register
+ */
+struct ad5446_chip_info {
+	struct iio_chan_spec channel;
+	u16 int_vref_mv;
+	int (*write)(struct ad5446_state *st, unsigned int val);
+};
+
+int ad5446_probe(struct device *dev, const char *name,
+		 const struct ad5446_chip_info *chip_info);
+
+#endif