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Subject[PATCH 2/3] iio:dac:ad5686: Add AD5672R/AD5676/AD5676R/AD5684R/AD5685R/AD5686R support
Date
The AD5684R/AD5685R/AD5686R are a family of 4 channel DACs with 12-bit,
14-bit and 16-bit precision respectively. The devices come either with a
built-in reference or no built-in reference.

The AD5672R/AD5676/AD5676R are similar, except that they have 8 channels
instead of 4.

Datasheets:
http://www.analog.com/media/en/technical-documentation/data-sheets/AD5672R_5676R.pdf
http://www.analog.com/media/en/technical-documentation/data-sheets/AD5686R_5685R_5684R.pdf

Signed-off-by: Stefan Popa <stefan.popa@analog.com>
---
drivers/iio/dac/ad5686.c | 97 ++++++++++++++++++++++++++++++++++++------------
1 file changed, 74 insertions(+), 23 deletions(-)

diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
index f7f975c..5fb0179 100644
--- a/drivers/iio/dac/ad5686.c
+++ b/drivers/iio/dac/ad5686.c
@@ -19,8 +19,6 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>

-#define AD5686_DAC_CHANNELS 4
-
#define AD5686_ADDR(x) ((x) << 16)
#define AD5686_CMD(x) ((x) << 20)

@@ -46,12 +44,14 @@
/**
* struct ad5686_chip_info - chip specific information
* @int_vref_mv: AD5620/40/60: the internal reference voltage
+ * @num_channels: number of channels
* @channel: channel specification
*/

struct ad5686_chip_info {
u16 int_vref_mv;
- struct iio_chan_spec channel[AD5686_DAC_CHANNELS];
+ unsigned int num_channels;
+ struct iio_chan_spec *channels;
};

/**
@@ -88,9 +88,14 @@ struct ad5686_state {
*/

enum ad5686_supported_device_ids {
+ ID_AD5672R,
+ ID_AD5676,
+ ID_AD5676R,
ID_AD5684,
- ID_AD5685,
+ ID_AD5684R,
+ ID_AD5685R,
ID_AD5686,
+ ID_AD5686R
};
static int ad5686_spi_write(struct ad5686_state *st,
u8 cmd, u8 addr, u16 val, u8 shift)
@@ -269,14 +274,14 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
{ },
};

-#define AD5868_CHANNEL(chan, bits, _shift) { \
+#define AD5868_CHANNEL(chan, addr, bits, _shift) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.output = 1, \
.channel = chan, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
- .address = AD5686_ADDR_DAC(chan), \
+ .address = addr, \
.scan_type = { \
.sign = 'u', \
.realbits = (bits), \
@@ -286,31 +291,72 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
.ext_info = ad5686_ext_info, \
}

+#define DECLARE_AD5686_CHANNELS(name, bits, _shift) \
+static struct iio_chan_spec name[] = { \
+ AD5868_CHANNEL(0, 1, bits, _shift), \
+ AD5868_CHANNEL(1, 2, bits, _shift), \
+ AD5868_CHANNEL(2, 4, bits, _shift), \
+ AD5868_CHANNEL(3, 8, bits, _shift), \
+}
+
+#define DECLARE_AD5676_CHANNELS(name, bits, _shift) \
+static struct iio_chan_spec name[] = { \
+ AD5868_CHANNEL(0, 0, bits, _shift), \
+ AD5868_CHANNEL(1, 1, bits, _shift), \
+ AD5868_CHANNEL(2, 2, bits, _shift), \
+ AD5868_CHANNEL(3, 3, bits, _shift), \
+ AD5868_CHANNEL(4, 4, bits, _shift), \
+ AD5868_CHANNEL(5, 5, bits, _shift), \
+ AD5868_CHANNEL(6, 6, bits, _shift), \
+ AD5868_CHANNEL(7, 7, bits, _shift), \
+}
+
+DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
+DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
+DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
+DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
+DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
+
static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
+ [ID_AD5672R] = {
+ .channels = ad5672_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 8,
+ },
+ [ID_AD5676] = {
+ .channels = ad5676_channels,
+ .num_channels = 8,
+ },
+ [ID_AD5676R] = {
+ .channels = ad5676_channels,
+ .int_vref_mv = 2500,
+ .num_channels = 8,
+ },
[ID_AD5684] = {
- .channel[0] = AD5868_CHANNEL(0, 12, 4),
- .channel[1] = AD5868_CHANNEL(1, 12, 4),
- .channel[2] = AD5868_CHANNEL(2, 12, 4),
- .channel[3] = AD5868_CHANNEL(3, 12, 4),
+ .channels = ad5684_channels,
+ .num_channels = 4,
+ },
+ [ID_AD5684R] = {
+ .channels = ad5684_channels,
.int_vref_mv = 2500,
+ .num_channels = 4,
},
- [ID_AD5685] = {
- .channel[0] = AD5868_CHANNEL(0, 14, 2),
- .channel[1] = AD5868_CHANNEL(1, 14, 2),
- .channel[2] = AD5868_CHANNEL(2, 14, 2),
- .channel[3] = AD5868_CHANNEL(3, 14, 2),
+ [ID_AD5685R] = {
+ .channels = ad5685r_channels,
.int_vref_mv = 2500,
+ .num_channels = 4,
},
[ID_AD5686] = {
- .channel[0] = AD5868_CHANNEL(0, 16, 0),
- .channel[1] = AD5868_CHANNEL(1, 16, 0),
- .channel[2] = AD5868_CHANNEL(2, 16, 0),
- .channel[3] = AD5868_CHANNEL(3, 16, 0),
+ .channels = ad5686_channels,
+ .num_channels = 4,
+ },
+ [ID_AD5686R] = {
+ .channels = ad5686_channels,
.int_vref_mv = 2500,
+ .num_channels = 4,
},
};

-
static int ad5686_probe(struct spi_device *spi)
{
struct ad5686_state *st;
@@ -354,8 +400,8 @@ static int ad5686_probe(struct spi_device *spi)
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad5686_info;
indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = st->chip_info->channel;
- indio_dev->num_channels = AD5686_DAC_CHANNELS;
+ indio_dev->channels = st->chip_info->channels;
+ indio_dev->num_channels = st->chip_info->num_channels;

ret = ad5686_spi_write(st, AD5686_CMD_INTERNAL_REFER_SETUP, 0,
!!voltage_uv, 0);
@@ -387,9 +433,14 @@ static int ad5686_remove(struct spi_device *spi)
}

static const struct spi_device_id ad5686_id[] = {
+ {"ad5672r", ID_AD5672R},
+ {"ad5676", ID_AD5676},
+ {"ad5676r", ID_AD5676R},
{"ad5684", ID_AD5684},
- {"ad5685", ID_AD5685},
+ {"ad5684r", ID_AD5684R},
+ {"ad5685r", ID_AD5685R},
{"ad5686", ID_AD5686},
+ {"ad5686r", ID_AD5686R},
{}
};
MODULE_DEVICE_TABLE(spi, ad5686_id);
--
2.7.4
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