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staging:iio:dac:ad5064: Add AD5628/AD5648/AD5668 support
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The AD5628/AD5648/AD5668 are similar to the AD5024/AD5044/AD5064. The difference
being that they have an internal reference voltage and 8 instead of 4 DAC
channels.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Lars-Peter Clausen authored and Greg Kroah-Hartman committed Feb 24, 2012
1 parent f8be4af commit bb92ff3
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Showing 2 changed files with 107 additions and 20 deletions.
5 changes: 3 additions & 2 deletions drivers/staging/iio/dac/Kconfig
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Original file line number Diff line number Diff line change
Expand Up @@ -4,11 +4,12 @@
menu "Digital to analog converters"

config AD5064
tristate "Analog Devices AD5064/64-1/65/44/45/24/25 DAC driver"
tristate "Analog Devices AD5064/64-1/65/44/45/24/25, AD5628/48/68 DAC driver"
depends on SPI
help
Say yes here to build support for Analog Devices AD5024, AD5025, AD5044,
AD5045, AD5064, AD5064-1, AD5065 Digital to Analog Converter.
AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5648, AD5668 Digital to Analog
Converter.

To compile this driver as a module, choose M here: the
module will be called ad5064.
Expand Down
122 changes: 104 additions & 18 deletions drivers/staging/iio/dac/ad5064.c
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
/*
* AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1 Digital to analog converters
* driver
* AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5648,
* AD5668 Digital to analog converters driver
*
* Copyright 2011 Analog Devices Inc.
*
Expand All @@ -20,7 +20,7 @@
#include "../sysfs.h"
#include "dac.h"

#define AD5064_MAX_DAC_CHANNELS 4
#define AD5064_MAX_DAC_CHANNELS 8
#define AD5064_MAX_VREFS 4

#define AD5064_ADDR(x) ((x) << 20)
Expand All @@ -37,7 +37,10 @@
#define AD5064_CMD_CLEAR 0x5
#define AD5064_CMD_LDAC_MASK 0x6
#define AD5064_CMD_RESET 0x7
#define AD5064_CMD_DAISY_CHAIN_ENABLE 0x8
#define AD5064_CMD_CONFIG 0x8

#define AD5064_CONFIG_DAISY_CHAIN_ENABLE BIT(1)
#define AD5064_CONFIG_INT_VREF_ENABLE BIT(0)

#define AD5064_LDAC_PWRDN_NONE 0x0
#define AD5064_LDAC_PWRDN_1K 0x1
Expand All @@ -47,12 +50,15 @@
/**
* struct ad5064_chip_info - chip specific information
* @shared_vref: whether the vref supply is shared between channels
* @internal_vref: internal reference voltage. 0 if the chip has no internal
* vref.
* @channel: channel specification
* @num_channels: number of channels
*/

struct ad5064_chip_info {
bool shared_vref;
unsigned long internal_vref;
const struct iio_chan_spec *channels;
unsigned int num_channels;
};
Expand All @@ -65,6 +71,8 @@ struct ad5064_chip_info {
* @pwr_down: whether channel is powered down
* @pwr_down_mode: channel's current power down mode
* @dac_cache: current DAC raw value (chip does not support readback)
* @use_internal_vref: set to true if the internal reference voltage should be
* used.
* @data: spi transfer buffers
*/

Expand All @@ -75,6 +83,7 @@ struct ad5064_state {
bool pwr_down[AD5064_MAX_DAC_CHANNELS];
u8 pwr_down_mode[AD5064_MAX_DAC_CHANNELS];
unsigned int dac_cache[AD5064_MAX_DAC_CHANNELS];
bool use_internal_vref;

/*
* DMA (thus cache coherency maintenance) requires the
Expand All @@ -91,6 +100,12 @@ enum ad5064_type {
ID_AD5064,
ID_AD5064_1,
ID_AD5065,
ID_AD5628_1,
ID_AD5628_2,
ID_AD5648_1,
ID_AD5648_2,
ID_AD5668_1,
ID_AD5668_2,
};

static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd,
Expand Down Expand Up @@ -196,23 +211,33 @@ static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev,
return ret ? ret : len;
}

static int ad5064_get_vref(struct ad5064_state *st,
struct iio_chan_spec const *chan)
{
unsigned int i;

if (st->use_internal_vref)
return st->chip_info->internal_vref;

i = st->chip_info->shared_vref ? 0 : chan->channel;
return regulator_get_voltage(st->vref_reg[i].consumer);
}

static int ad5064_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct ad5064_state *st = iio_priv(indio_dev);
unsigned int vref;
int scale_uv;

switch (m) {
case 0:
*val = st->dac_cache[chan->channel];
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
vref = st->chip_info->shared_vref ? 0 : chan->channel;
scale_uv = regulator_get_voltage(st->vref_reg[vref].consumer);
scale_uv = ad5064_get_vref(st, chan);
if (scale_uv < 0)
return scale_uv;

Expand Down Expand Up @@ -293,6 +318,10 @@ const struct iio_chan_spec name[] = { \
AD5064_CHANNEL(1, bits), \
AD5064_CHANNEL(2, bits), \
AD5064_CHANNEL(3, bits), \
AD5064_CHANNEL(4, bits), \
AD5064_CHANNEL(5, bits), \
AD5064_CHANNEL(6, bits), \
AD5064_CHANNEL(7, bits), \
}

static DECLARE_AD5064_CHANNELS(ad5024_channels, 12);
Expand Down Expand Up @@ -335,6 +364,42 @@ static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
.channels = ad5064_channels,
.num_channels = 2,
},
[ID_AD5628_1] = {
.shared_vref = true,
.internal_vref = 2500000,
.channels = ad5024_channels,
.num_channels = 8,
},
[ID_AD5628_2] = {
.shared_vref = true,
.internal_vref = 5000000,
.channels = ad5024_channels,
.num_channels = 8,
},
[ID_AD5648_1] = {
.shared_vref = true,
.internal_vref = 2500000,
.channels = ad5044_channels,
.num_channels = 8,
},
[ID_AD5648_2] = {
.shared_vref = true,
.internal_vref = 5000000,
.channels = ad5044_channels,
.num_channels = 8,
},
[ID_AD5668_1] = {
.shared_vref = true,
.internal_vref = 2500000,
.channels = ad5064_channels,
.num_channels = 8,
},
[ID_AD5668_2] = {
.shared_vref = true,
.internal_vref = 5000000,
.channels = ad5064_channels,
.num_channels = 8,
},
};

static inline unsigned int ad5064_num_vref(struct ad5064_state *st)
Expand Down Expand Up @@ -378,12 +443,22 @@ static int __devinit ad5064_probe(struct spi_device *spi)

ret = regulator_bulk_get(&st->spi->dev, ad5064_num_vref(st),
st->vref_reg);
if (ret)
goto error_free;

ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg);
if (ret)
goto error_free_reg;
if (ret) {
if (!st->chip_info->internal_vref)
goto error_free;
st->use_internal_vref = true;
ret = ad5064_spi_write(st, AD5064_CMD_CONFIG, 0,
AD5064_CONFIG_INT_VREF_ENABLE, 0);
if (ret) {
dev_err(&spi->dev, "Failed to enable internal vref: %d\n",
ret);
goto error_free;
}
} else {
ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg);
if (ret)
goto error_free_reg;
}

for (i = 0; i < st->chip_info->num_channels; ++i) {
st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;
Expand All @@ -404,9 +479,11 @@ static int __devinit ad5064_probe(struct spi_device *spi)
return 0;

error_disable_reg:
regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
if (!st->use_internal_vref)
regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
error_free_reg:
regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);
if (!st->use_internal_vref)
regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);
error_free:
iio_free_device(indio_dev);

Expand All @@ -421,8 +498,10 @@ static int __devexit ad5064_remove(struct spi_device *spi)

iio_device_unregister(indio_dev);

regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);
if (!st->use_internal_vref) {
regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
regulator_bulk_free(ad5064_num_vref(st), st->vref_reg);
}

iio_free_device(indio_dev);

Expand All @@ -437,6 +516,13 @@ static const struct spi_device_id ad5064_id[] = {
{"ad5064", ID_AD5064},
{"ad5064-1", ID_AD5064_1},
{"ad5065", ID_AD5065},
{"ad5628-1", ID_AD5628_1},
{"ad5628-2", ID_AD5628_2},
{"ad5648-1", ID_AD5648_1},
{"ad5648-2", ID_AD5648_2},
{"ad5668-1", ID_AD5668_1},
{"ad5668-2", ID_AD5668_2},
{"ad5668-3", ID_AD5668_2}, /* similar enough to ad5668-2 */
{}
};
MODULE_DEVICE_TABLE(spi, ad5064_id);
Expand All @@ -453,5 +539,5 @@ static struct spi_driver ad5064_driver = {
module_spi_driver(ad5064_driver);

MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("Analog Devices AD5024/25/44/45/64/64-1/65 DAC");
MODULE_DESCRIPTION("Analog Devices AD5024/25/44/45/64/64-1/65, AD5628/48/68 DAC");
MODULE_LICENSE("GPL v2");

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