iio:ad5064: Add AD5625/AD5627/AD5645/AD5647/AD4665/AD5657 support

The AD5625/AD5645/AD5665 are a family of 4 channel DACs with 12-bit, 14-bit
and 16-bit precision respectively. The devices come in 3 flavors in terms
of built-in reference, either no built-in reference, built-in 1.25V
reference or built-in 2.5V reference.

The AD5627/AD5647/AD5667 are similar to the AD5625/AD5645/AD5665 except
that they have 2 instead of 4 channels.

While these new devices are mostly register map compatible with the
existing devices support by the driver some offsets and register addresses
have been shuffled around. To accommodate this introduce a new register map
layout. For the lack of a better name we will just call it version 2.

Datasheets:
	http://www.analog.com/media/en/technical-documentation/data-sheets/AD5625R_5645R_5665R_5625_5665.pdf
	http://www.analog.com/media/en/technical-documentation/data-sheets/AD5627R_5647R_5667R_5627_5667.pdf

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

2 files changed, 188 insertions, 11 deletions

diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
index a56b52dbefa0..3c809e2baecb 100644
--- a/drivers/iio/dac/Kconfig
+++ b/drivers/iio/dac/Kconfig
@@ -10,9 +10,10 @@ config AD5064
         depends on (SPI_MASTER && I2C!=m) || I2C
         help
           Say yes here to build support for Analog Devices AD5024, AD5025, AD5044,
-          AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5629R, AD5648, AD5666, AD5668,
-          AD5669R, LTC2606, LTC2607, LTC2609, LTC2616, LTC2617, LTC2619, LTC2626,
-          LTC2627, LTC2629 Digital to Analog Converter.
+          AD5045, AD5064, AD5064-1, AD5065, AD5625, AD5625R, AD5627, AD5627R,
+          AD5628, AD5629R, AD5645R, AD5647R, AD5648, AD5665, AD5665R, AD5666,
+          AD5667, AD5667R, AD5668, AD5669R, LTC2606, LTC2607, LTC2609, LTC2616,
+          LTC2617, LTC2619, LTC2626, LTC2627, LTC2629 Digital to Analog Converter.
 
           To compile this driver as a module, choose M here: the
           module will be called ad5064.
diff --git a/drivers/iio/dac/ad5064.c b/drivers/iio/dac/ad5064.c
index b7f717cadd0b..6803e4a137cd 100644
--- a/drivers/iio/dac/ad5064.c
+++ b/drivers/iio/dac/ad5064.c
@@ -1,6 +1,7 @@
 /*
- * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5629R,
- * AD5648, AD5666, AD5668, AD5669R, LTC2606, LTC2607, LTC2609, LTC2616,
+ * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5625, AD5625R,
+ * AD5627, AD5627R, AD5628, AD5629R, AD5645R, AD5647R, AD5648, AD5665, AD5665R,
+ * AD5666, AD5667, AD5667R, AD5668, AD5669R, LTC2606, LTC2607, LTC2609, LTC2616,
  * LTC2617, LTC2619, LTC2626, LTC2627, LTC2629 Digital to analog converters
  * driver
  *
@@ -41,6 +42,9 @@
 #define AD5064_CMD_RESET                        0x7
 #define AD5064_CMD_CONFIG                       0x8
 
+#define AD5064_CMD_RESET_V2                     0x5
+#define AD5064_CMD_CONFIG_V2                    0x7
+
 #define AD5064_CONFIG_DAISY_CHAIN_ENABLE        BIT(1)
 #define AD5064_CONFIG_INT_VREF_ENABLE           BIT(0)
 
@@ -51,11 +55,13 @@
 
 /**
  * enum ad5064_regmap_type - Register layout variant
- * @AD5064_REGMAP_ADI: Analog Devices register map layout
+ * @AD5064_REGMAP_ADI: Old Analog Devices register map layout
+ * @AD5064_REGMAP_ADI2: New Analog Devices register map layout
  * @AD5064_REGMAP_LTC: LTC register map layout
  */
 enum ad5064_regmap_type {
         AD5064_REGMAP_ADI,
+        AD5064_REGMAP_ADI2,
         AD5064_REGMAP_LTC,
 };
 
@@ -125,14 +131,30 @@ enum ad5064_type {
         ID_AD5064,
         ID_AD5064_1,
         ID_AD5065,
+        ID_AD5625,
+        ID_AD5625R_1V25,
+        ID_AD5625R_2V5,
+        ID_AD5627,
+        ID_AD5627R_1V25,
+        ID_AD5627R_2V5,
         ID_AD5628_1,
         ID_AD5628_2,
         ID_AD5629_1,
         ID_AD5629_2,
+        ID_AD5645R_1V25,
+        ID_AD5645R_2V5,
+        ID_AD5647R_1V25,
+        ID_AD5647R_2V5,
         ID_AD5648_1,
         ID_AD5648_2,
+        ID_AD5665,
+        ID_AD5665R_1V25,
+        ID_AD5665R_2V5,
         ID_AD5666_1,
         ID_AD5666_2,
+        ID_AD5667,
+        ID_AD5667R_1V25,
+        ID_AD5667R_2V5,
         ID_AD5668_1,
         ID_AD5668_2,
         ID_AD5669_1,
@@ -160,17 +182,23 @@ static int ad5064_sync_powerdown_mode(struct ad5064_state *st,
         const struct iio_chan_spec *chan)
 {
         unsigned int val, address;
+        unsigned int shift;
         int ret;
 
         if (st->chip_info->regmap_type == AD5064_REGMAP_LTC) {
                 val = 0;
                 address = chan->address;
         } else {
-                address = 0;
+                if (st->chip_info->regmap_type == AD5064_REGMAP_ADI2)
+                        shift = 4;
+                else
+                        shift = 8;
+
                 val = (0x1 << chan->address);
+                address = 0;
 
                 if (st->pwr_down[chan->channel])
-                        val |= st->pwr_down_mode[chan->channel] << 8;
+                        val |= st->pwr_down_mode[chan->channel] << shift;
         }
 
         ret = ad5064_write(st, AD5064_CMD_POWERDOWN_DAC, address, val, 0);
@@ -391,6 +419,7 @@ static DECLARE_AD5065_CHANNELS(ad5045_channels, 14, 6, ad5064_ext_info);
 static DECLARE_AD5065_CHANNELS(ad5065_channels, 16, 4, ad5064_ext_info);
 
 static DECLARE_AD5064_CHANNELS(ad5629_channels, 12, 4, ad5064_ext_info);
+static DECLARE_AD5064_CHANNELS(ad5645_channels, 14, 2, ad5064_ext_info);
 static DECLARE_AD5064_CHANNELS(ad5669_channels, 16, 0, ad5064_ext_info);
 
 static DECLARE_AD5064_CHANNELS(ltc2607_channels, 16, 0, ltc2617_ext_info);
@@ -440,6 +469,46 @@ static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
                 .num_channels = 2,
                 .regmap_type = AD5064_REGMAP_ADI,
         },
+        [ID_AD5625] = {
+                .shared_vref = true,
+                .channels = ad5629_channels,
+                .num_channels = 4,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5625R_1V25] = {
+                .shared_vref = true,
+                .internal_vref = 1250000,
+                .channels = ad5629_channels,
+                .num_channels = 4,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5625R_2V5] = {
+                .shared_vref = true,
+                .internal_vref = 2500000,
+                .channels = ad5629_channels,
+                .num_channels = 4,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5627] = {
+                .shared_vref = true,
+                .channels = ad5629_channels,
+                .num_channels = 2,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5627R_1V25] = {
+                .shared_vref = true,
+                .internal_vref = 1250000,
+                .channels = ad5629_channels,
+                .num_channels = 2,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5627R_2V5] = {
+                .shared_vref = true,
+                .internal_vref = 2500000,
+                .channels = ad5629_channels,
+                .num_channels = 2,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
         [ID_AD5628_1] = {
                 .shared_vref = true,
                 .internal_vref = 2500000,
@@ -468,6 +537,34 @@ static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
                 .num_channels = 8,
                 .regmap_type = AD5064_REGMAP_ADI,
         },
+        [ID_AD5645R_1V25] = {
+                .shared_vref = true,
+                .internal_vref = 1250000,
+                .channels = ad5645_channels,
+                .num_channels = 4,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5645R_2V5] = {
+                .shared_vref = true,
+                .internal_vref = 2500000,
+                .channels = ad5645_channels,
+                .num_channels = 4,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5647R_1V25] = {
+                .shared_vref = true,
+                .internal_vref = 1250000,
+                .channels = ad5645_channels,
+                .num_channels = 2,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5647R_2V5] = {
+                .shared_vref = true,
+                .internal_vref = 2500000,
+                .channels = ad5645_channels,
+                .num_channels = 2,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
         [ID_AD5648_1] = {
                 .shared_vref = true,
                 .internal_vref = 2500000,
@@ -482,6 +579,26 @@ static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
                 .num_channels = 8,
                 .regmap_type = AD5064_REGMAP_ADI,
         },
+        [ID_AD5665] = {
+                .shared_vref = true,
+                .channels = ad5669_channels,
+                .num_channels = 4,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5665R_1V25] = {
+                .shared_vref = true,
+                .internal_vref = 1250000,
+                .channels = ad5669_channels,
+                .num_channels = 4,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5665R_2V5] = {
+                .shared_vref = true,
+                .internal_vref = 2500000,
+                .channels = ad5669_channels,
+                .num_channels = 4,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
         [ID_AD5666_1] = {
                 .shared_vref = true,
                 .internal_vref = 2500000,
@@ -496,6 +613,26 @@ static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
                 .num_channels = 4,
                 .regmap_type = AD5064_REGMAP_ADI,
         },
+        [ID_AD5667] = {
+                .shared_vref = true,
+                .channels = ad5669_channels,
+                .num_channels = 2,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5667R_1V25] = {
+                .shared_vref = true,
+                .internal_vref = 1250000,
+                .channels = ad5669_channels,
+                .num_channels = 2,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
+        [ID_AD5667R_2V5] = {
+                .shared_vref = true,
+                .internal_vref = 2500000,
+                .channels = ad5669_channels,
+                .num_channels = 2,
+                .regmap_type = AD5064_REGMAP_ADI2
+        },
         [ID_AD5668_1] = {
                 .shared_vref = true,
                 .internal_vref = 2500000,
@@ -607,6 +744,22 @@ static const char * const ad5064_vref_name(struct ad5064_state *st,
         return st->chip_info->shared_vref ? "vref" : ad5064_vref_names[vref];
 }
 
+static int ad5064_set_config(struct ad5064_state *st, unsigned int val)
+{
+        unsigned int cmd;
+
+        switch (st->chip_info->regmap_type) {
+        case AD5064_REGMAP_ADI2:
+                cmd = AD5064_CMD_CONFIG_V2;
+                break;
+        default:
+                cmd = AD5064_CMD_CONFIG;
+                break;
+        }
+
+        return ad5064_write(st, cmd, 0, val, 0);
+}
+
 static int ad5064_probe(struct device *dev, enum ad5064_type type,
                         const char *name, ad5064_write_func write)
 {
@@ -636,8 +789,7 @@ static int ad5064_probe(struct device *dev, enum ad5064_type type,
                 if (!st->chip_info->internal_vref)
                         return ret;
                 st->use_internal_vref = true;
-                ret = ad5064_write(st, AD5064_CMD_CONFIG, 0,
-                        AD5064_CONFIG_INT_VREF_ENABLE, 0);
+                ret = ad5064_set_config(st, AD5064_CONFIG_INT_VREF_ENABLE);
                 if (ret) {
                         dev_err(dev, "Failed to enable internal vref: %d\n",
                                 ret);
@@ -766,9 +918,19 @@ static int ad5064_i2c_write(struct ad5064_state *st, unsigned int cmd,
         unsigned int addr, unsigned int val)
 {
         struct i2c_client *i2c = to_i2c_client(st->dev);
+        unsigned int cmd_shift;
         int ret;
 
-        st->data.i2c[0] = (cmd << 4) | addr;
+        switch (st->chip_info->regmap_type) {
+        case AD5064_REGMAP_ADI2:
+                cmd_shift = 3;
+                break;
+        default:
+                cmd_shift = 4;
+                break;
+        }
+
+        st->data.i2c[0] = (cmd << cmd_shift) | addr;
         put_unaligned_be16(val, &st->data.i2c[1]);
 
         ret = i2c_master_send(i2c, st->data.i2c, 3);
@@ -791,9 +953,23 @@ static int ad5064_i2c_remove(struct i2c_client *i2c)
 }
 
 static const struct i2c_device_id ad5064_i2c_ids[] = {
+        {"ad5625", ID_AD5625 },
+        {"ad5625r-1v25", ID_AD5625R_1V25 },
+        {"ad5625r-2v5", ID_AD5625R_2V5 },
+        {"ad5627", ID_AD5627 },
+        {"ad5627r-1v25", ID_AD5627R_1V25 },
+        {"ad5627r-2v5", ID_AD5627R_2V5 },
         {"ad5629-1", ID_AD5629_1},
         {"ad5629-2", ID_AD5629_2},
         {"ad5629-3", ID_AD5629_2}, /* similar enough to ad5629-2 */
+        {"ad5645r-1v25", ID_AD5645R_1V25 },
+        {"ad5645r-2v5", ID_AD5645R_2V5 },
+        {"ad5665", ID_AD5665 },
+        {"ad5665r-1v25", ID_AD5665R_1V25 },
+        {"ad5665r-2v5", ID_AD5665R_2V5 },
+        {"ad5667", ID_AD5667 },
+        {"ad5667r-1v25", ID_AD5667R_1V25 },
+        {"ad5667r-2v5", ID_AD5667R_2V5 },
         {"ad5669-1", ID_AD5669_1},
         {"ad5669-2", ID_AD5669_2},
         {"ad5669-3", ID_AD5669_2}, /* similar enough to ad5669-2 */