iio:dac:ad5686: Add AD5310R support

The AD5310R is a single channel DAC with 10-bit precision, which is
part of the same family as AD5311R, except that it uses the spi interface
instead of i2c. The device has a built-in 2.5V reference which is enabled
by default.

Another important difference is that the SPI write command operation is
16 bits long. The first four bits represent the command, while the
remaining 12 bits are for data. In the control reg, DB9 and DB10 are used
for power-down modes, while DB8 is the REF bit. In order to accommodate
this change, a new regmap type was defined and checked accordingly.

Because AD5310R does not have a readback register, the read_raw operation
will return "Operation is not supported".

Datasheet:
Link: http://www.analog.com/media/en/technical-documentation/data-sheets/AD5310R_5311R.pdfSigned-off-by: Stefan Popa <stefan.popa@analog.com>
Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/dac/ad5686-spi.c

@@ -19,6 +19,12 @@ static int ad5686_spi_write(struct ad5686_state *st,
 	u8 tx_len, *buf;
 
 	switch (st->chip_info->regmap_type) {
+	case AD5310_REGMAP:
+		st->data[0].d16 = cpu_to_be16(AD5310_CMD(cmd) |
+					      val);
+		buf = &st->data[0].d8[0];
+		tx_len = 2;
+		break;
 	case AD5683_REGMAP:
 		st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
 					      AD5683_DATA(val));
@@ -56,10 +62,18 @@ static int ad5686_spi_read(struct ad5686_state *st, u8 addr)
 	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)
+	switch (st->chip_info->regmap_type) {
+	case AD5310_REGMAP:
+		return -ENOTSUPP;
+	case AD5683_REGMAP:
 		cmd = AD5686_CMD_READBACK_ENABLE_V2;
+		break;
+	case AD5686_REGMAP:
+		cmd = AD5686_CMD_READBACK_ENABLE;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) |
 				      AD5686_ADDR(addr));
@@ -86,6 +100,7 @@ static int ad5686_spi_remove(struct spi_device *spi)
 }
 
 static const struct spi_device_id ad5686_spi_id[] = {
+	{"ad5310r", ID_AD5310R},
 	{"ad5672r", ID_AD5672R},
 	{"ad5676", ID_AD5676},
 	{"ad5676r", ID_AD5676R},

drivers/iio/dac/ad5686.c

@@ -83,6 +83,10 @@ static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
 		st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));
 
 	switch (st->chip_info->regmap_type) {
+	case AD5310_REGMAP:
+		shift = 9;
+		ref_bit_msk = AD5310_REF_BIT_MSK;
+		break;
 	case AD5683_REGMAP:
 		shift = 13;
 		ref_bit_msk = AD5683_REF_BIT_MSK;
@@ -221,6 +225,7 @@ static struct iio_chan_spec name[] = {				\
 		AD5868_CHANNEL(7, 7, bits, _shift),		\
 }
 
+DECLARE_AD5693_CHANNELS(ad5310r_channels, 10, 2);
 DECLARE_AD5693_CHANNELS(ad5311r_channels, 10, 6);
 DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
 DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
@@ -232,6 +237,12 @@ DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);
 DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);
 
 static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
+	[ID_AD5310R] = {
+		.channels = ad5310r_channels,
+		.int_vref_mv = 2500,
+		.num_channels = 1,
+		.regmap_type = AD5310_REGMAP,
+	},
 	[ID_AD5311R] = {
 		.channels = ad5311r_channels,
 		.int_vref_mv = 2500,
@@ -419,6 +430,11 @@ int ad5686_probe(struct device *dev,
 	indio_dev->num_channels = st->chip_info->num_channels;
 
 	switch (st->chip_info->regmap_type) {
+	case AD5310_REGMAP:
+		cmd = AD5686_CMD_CONTROL_REG;
+		ref_bit_msk = AD5310_REF_BIT_MSK;
+		st->use_internal_vref = !voltage_uv;
+		break;
 	case AD5683_REGMAP:
 		cmd = AD5686_CMD_CONTROL_REG;
 		ref_bit_msk = AD5683_REF_BIT_MSK;

drivers/iio/dac/ad5686.h

@@ -13,7 +13,10 @@
 #include <linux/mutex.h>
 #include <linux/kernel.h>
 
+#define AD5310_CMD(x)				((x) << 12)
+
 #define AD5683_DATA(x)				((x) << 4)
+
 #define AD5686_ADDR(x)				((x) << 16)
 #define AD5686_CMD(x)				((x) << 20)
 
@@ -38,6 +41,8 @@
 
 #define AD5686_CMD_CONTROL_REG			0x4
 #define AD5686_CMD_READBACK_ENABLE_V2		0x5
+
+#define AD5310_REF_BIT_MSK			BIT(8)
 #define AD5683_REF_BIT_MSK			BIT(12)
 #define AD5693_REF_BIT_MSK			BIT(12)
 
@@ -45,6 +50,7 @@
  * ad5686_supported_device_ids:
  */
 enum ad5686_supported_device_ids {
+	ID_AD5310R,
 	ID_AD5311R,
 	ID_AD5671R,
 	ID_AD5672R,
@@ -72,6 +78,7 @@ enum ad5686_supported_device_ids {
 };
 
 enum ad5686_regmap_type {
+	AD5310_REGMAP,
 	AD5683_REGMAP,
 	AD5686_REGMAP,
 	AD5693_REGMAP