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Diffstat (limited to 'drivers/staging/iio/dac/ad5064.c')
-rw-r--r--drivers/staging/iio/dac/ad5064.c369
1 files changed, 238 insertions, 131 deletions
diff --git a/drivers/staging/iio/dac/ad5064.c b/drivers/staging/iio/dac/ad5064.c
index 049a855039c2..06b162745a3e 100644
--- a/drivers/staging/iio/dac/ad5064.c
+++ b/drivers/staging/iio/dac/ad5064.c
@@ -1,5 +1,6 @@
/*
- * AD5064, AD5064-1, AD5044, AD5024 Digital to analog converters driver
+ * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5648,
+ * AD5666, AD5668 Digital to analog converters driver
*
* Copyright 2011 Analog Devices Inc.
*
@@ -19,7 +20,8 @@
#include "../sysfs.h"
#include "dac.h"
-#define AD5064_DAC_CHANNELS 4
+#define AD5064_MAX_DAC_CHANNELS 8
+#define AD5064_MAX_VREFS 4
#define AD5064_ADDR(x) ((x) << 20)
#define AD5064_CMD(x) ((x) << 24)
@@ -35,7 +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
@@ -45,12 +50,17 @@
/**
* 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;
- struct iio_chan_spec channel[AD5064_DAC_CHANNELS];
+ unsigned long internal_vref;
+ const struct iio_chan_spec *channels;
+ unsigned int num_channels;
};
/**
@@ -61,16 +71,19 @@ 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
*/
struct ad5064_state {
struct spi_device *spi;
const struct ad5064_chip_info *chip_info;
- struct regulator_bulk_data vref_reg[AD5064_DAC_CHANNELS];
- bool pwr_down[AD5064_DAC_CHANNELS];
- u8 pwr_down_mode[AD5064_DAC_CHANNELS];
- unsigned int dac_cache[AD5064_DAC_CHANNELS];
+ struct regulator_bulk_data vref_reg[AD5064_MAX_VREFS];
+ 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
@@ -81,50 +94,20 @@ struct ad5064_state {
enum ad5064_type {
ID_AD5024,
+ ID_AD5025,
ID_AD5044,
+ ID_AD5045,
ID_AD5064,
ID_AD5064_1,
-};
-
-#define AD5064_CHANNEL(chan, bits) { \
- .type = IIO_VOLTAGE, \
- .indexed = 1, \
- .output = 1, \
- .channel = (chan), \
- .info_mask = IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
- .address = AD5064_ADDR_DAC(chan), \
- .scan_type = IIO_ST('u', (bits), 16, 20 - (bits)) \
-}
-
-static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
- [ID_AD5024] = {
- .shared_vref = false,
- .channel[0] = AD5064_CHANNEL(0, 12),
- .channel[1] = AD5064_CHANNEL(1, 12),
- .channel[2] = AD5064_CHANNEL(2, 12),
- .channel[3] = AD5064_CHANNEL(3, 12),
- },
- [ID_AD5044] = {
- .shared_vref = false,
- .channel[0] = AD5064_CHANNEL(0, 14),
- .channel[1] = AD5064_CHANNEL(1, 14),
- .channel[2] = AD5064_CHANNEL(2, 14),
- .channel[3] = AD5064_CHANNEL(3, 14),
- },
- [ID_AD5064] = {
- .shared_vref = false,
- .channel[0] = AD5064_CHANNEL(0, 16),
- .channel[1] = AD5064_CHANNEL(1, 16),
- .channel[2] = AD5064_CHANNEL(2, 16),
- .channel[3] = AD5064_CHANNEL(3, 16),
- },
- [ID_AD5064_1] = {
- .shared_vref = true,
- .channel[0] = AD5064_CHANNEL(0, 16),
- .channel[1] = AD5064_CHANNEL(1, 16),
- .channel[2] = AD5064_CHANNEL(2, 16),
- .channel[3] = AD5064_CHANNEL(3, 16),
- },
+ ID_AD5065,
+ ID_AD5628_1,
+ ID_AD5628_2,
+ ID_AD5648_1,
+ ID_AD5648_2,
+ ID_AD5666_1,
+ ID_AD5666_2,
+ ID_AD5668_1,
+ ID_AD5668_2,
};
static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd,
@@ -160,22 +143,25 @@ static const char ad5064_powerdown_modes[][15] = {
[AD5064_LDAC_PWRDN_3STATE] = "three_state",
};
-static ssize_t ad5064_read_powerdown_mode(struct device *dev,
- struct device_attribute *attr, char *buf)
+static ssize_t ad5064_read_powerdown_mode_available(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, char *buf)
+{
+ return sprintf(buf, "%s %s %s\n", ad5064_powerdown_modes[1],
+ ad5064_powerdown_modes[2], ad5064_powerdown_modes[3]);
+}
+
+static ssize_t ad5064_read_powerdown_mode(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, char *buf)
{
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5064_state *st = iio_priv(indio_dev);
return sprintf(buf, "%s\n",
- ad5064_powerdown_modes[st->pwr_down_mode[this_attr->address]]);
+ ad5064_powerdown_modes[st->pwr_down_mode[chan->channel]]);
}
-static ssize_t ad5064_write_powerdown_mode(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t len)
+static ssize_t ad5064_write_powerdown_mode(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, const char *buf, size_t len)
{
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5064_state *st = iio_priv(indio_dev);
unsigned int mode, i;
int ret;
@@ -192,31 +178,26 @@ static ssize_t ad5064_write_powerdown_mode(struct device *dev,
return -EINVAL;
mutex_lock(&indio_dev->mlock);
- st->pwr_down_mode[this_attr->address] = mode;
+ st->pwr_down_mode[chan->channel] = mode;
- ret = ad5064_sync_powerdown_mode(st, this_attr->address);
+ ret = ad5064_sync_powerdown_mode(st, chan->channel);
mutex_unlock(&indio_dev->mlock);
return ret ? ret : len;
}
-static ssize_t ad5064_read_dac_powerdown(struct device *dev,
- struct device_attribute *attr,
- char *buf)
+static ssize_t ad5064_read_dac_powerdown(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, char *buf)
{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5064_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
- return sprintf(buf, "%d\n", st->pwr_down[this_attr->address]);
+ return sprintf(buf, "%d\n", st->pwr_down[chan->channel]);
}
-static ssize_t ad5064_write_dac_powerdown(struct device *dev,
- struct device_attribute *attr, const char *buf, size_t len)
+static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan, const char *buf, size_t len)
{
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5064_state *st = iio_priv(indio_dev);
- struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
bool pwr_down;
int ret;
@@ -225,53 +206,24 @@ static ssize_t ad5064_write_dac_powerdown(struct device *dev,
return ret;
mutex_lock(&indio_dev->mlock);
- st->pwr_down[this_attr->address] = pwr_down;
+ st->pwr_down[chan->channel] = pwr_down;
- ret = ad5064_sync_powerdown_mode(st, this_attr->address);
+ ret = ad5064_sync_powerdown_mode(st, chan->channel);
mutex_unlock(&indio_dev->mlock);
return ret ? ret : len;
}
-static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
- "1kohm_to_gnd 100kohm_to_gnd three_state");
-
-#define IIO_DEV_ATTR_DAC_POWERDOWN_MODE(_chan) \
- IIO_DEVICE_ATTR(out_voltage##_chan##_powerdown_mode, \
- S_IRUGO | S_IWUSR, \
- ad5064_read_powerdown_mode, \
- ad5064_write_powerdown_mode, _chan);
-
-#define IIO_DEV_ATTR_DAC_POWERDOWN(_chan) \
- IIO_DEVICE_ATTR(out_voltage##_chan##_powerdown, \
- S_IRUGO | S_IWUSR, \
- ad5064_read_dac_powerdown, \
- ad5064_write_dac_powerdown, _chan)
-
-static IIO_DEV_ATTR_DAC_POWERDOWN(0);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(0);
-static IIO_DEV_ATTR_DAC_POWERDOWN(1);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(1);
-static IIO_DEV_ATTR_DAC_POWERDOWN(2);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(2);
-static IIO_DEV_ATTR_DAC_POWERDOWN(3);
-static IIO_DEV_ATTR_DAC_POWERDOWN_MODE(3);
-
-static struct attribute *ad5064_attributes[] = {
- &iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
- &iio_dev_attr_out_voltage1_powerdown.dev_attr.attr,
- &iio_dev_attr_out_voltage2_powerdown.dev_attr.attr,
- &iio_dev_attr_out_voltage3_powerdown.dev_attr.attr,
- &iio_dev_attr_out_voltage0_powerdown_mode.dev_attr.attr,
- &iio_dev_attr_out_voltage1_powerdown_mode.dev_attr.attr,
- &iio_dev_attr_out_voltage2_powerdown_mode.dev_attr.attr,
- &iio_dev_attr_out_voltage3_powerdown_mode.dev_attr.attr,
- &iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
- NULL,
-};
+static int ad5064_get_vref(struct ad5064_state *st,
+ struct iio_chan_spec const *chan)
+{
+ unsigned int i;
-static const struct attribute_group ad5064_attribute_group = {
- .attrs = ad5064_attributes,
-};
+ 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,
@@ -280,7 +232,6 @@ static int ad5064_read_raw(struct iio_dev *indio_dev,
long m)
{
struct ad5064_state *st = iio_priv(indio_dev);
- unsigned int vref;
int scale_uv;
switch (m) {
@@ -288,8 +239,7 @@ static int ad5064_read_raw(struct iio_dev *indio_dev,
*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;
@@ -331,13 +281,144 @@ static int ad5064_write_raw(struct iio_dev *indio_dev,
static const struct iio_info ad5064_info = {
.read_raw = ad5064_read_raw,
.write_raw = ad5064_write_raw,
- .attrs = &ad5064_attribute_group,
.driver_module = THIS_MODULE,
};
+static struct iio_chan_spec_ext_info ad5064_ext_info[] = {
+ {
+ .name = "powerdown",
+ .read = ad5064_read_dac_powerdown,
+ .write = ad5064_write_dac_powerdown,
+ },
+ {
+ .name = "powerdown_mode",
+ .read = ad5064_read_powerdown_mode,
+ .write = ad5064_write_powerdown_mode,
+ },
+ {
+ .name = "powerdown_mode_available",
+ .shared = true,
+ .read = ad5064_read_powerdown_mode_available,
+ },
+ { },
+};
+
+#define AD5064_CHANNEL(chan, bits) { \
+ .type = IIO_VOLTAGE, \
+ .indexed = 1, \
+ .output = 1, \
+ .channel = (chan), \
+ .info_mask = IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
+ .address = AD5064_ADDR_DAC(chan), \
+ .scan_type = IIO_ST('u', (bits), 16, 20 - (bits)), \
+ .ext_info = ad5064_ext_info, \
+}
+
+#define DECLARE_AD5064_CHANNELS(name, bits) \
+const struct iio_chan_spec name[] = { \
+ AD5064_CHANNEL(0, bits), \
+ 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);
+static DECLARE_AD5064_CHANNELS(ad5044_channels, 14);
+static DECLARE_AD5064_CHANNELS(ad5064_channels, 16);
+
+static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
+ [ID_AD5024] = {
+ .shared_vref = false,
+ .channels = ad5024_channels,
+ .num_channels = 4,
+ },
+ [ID_AD5025] = {
+ .shared_vref = false,
+ .channels = ad5024_channels,
+ .num_channels = 2,
+ },
+ [ID_AD5044] = {
+ .shared_vref = false,
+ .channels = ad5044_channels,
+ .num_channels = 4,
+ },
+ [ID_AD5045] = {
+ .shared_vref = false,
+ .channels = ad5044_channels,
+ .num_channels = 2,
+ },
+ [ID_AD5064] = {
+ .shared_vref = false,
+ .channels = ad5064_channels,
+ .num_channels = 4,
+ },
+ [ID_AD5064_1] = {
+ .shared_vref = true,
+ .channels = ad5064_channels,
+ .num_channels = 4,
+ },
+ [ID_AD5065] = {
+ .shared_vref = false,
+ .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_AD5666_1] = {
+ .shared_vref = true,
+ .internal_vref = 2500000,
+ .channels = ad5064_channels,
+ .num_channels = 4,
+ },
+ [ID_AD5666_2] = {
+ .shared_vref = true,
+ .internal_vref = 5000000,
+ .channels = ad5064_channels,
+ .num_channels = 4,
+ },
+ [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)
{
- return st->chip_info->shared_vref ? 1 : AD5064_DAC_CHANNELS;
+ return st->chip_info->shared_vref ? 1 : st->chip_info->num_channels;
}
static const char * const ad5064_vref_names[] = {
@@ -376,14 +457,24 @@ 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 < AD5064_DAC_CHANNELS; ++i) {
+ for (i = 0; i < st->chip_info->num_channels; ++i) {
st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;
st->dac_cache[i] = 0x8000;
}
@@ -392,8 +483,8 @@ static int __devinit ad5064_probe(struct spi_device *spi)
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad5064_info;
indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = st->chip_info->channel;
- indio_dev->num_channels = AD5064_DAC_CHANNELS;
+ indio_dev->channels = st->chip_info->channels;
+ indio_dev->num_channels = st->chip_info->num_channels;
ret = iio_device_register(indio_dev);
if (ret)
@@ -402,9 +493,11 @@ 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);
@@ -419,8 +512,10 @@ 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);
@@ -429,9 +524,21 @@ static int __devexit ad5064_remove(struct spi_device *spi)
static const struct spi_device_id ad5064_id[] = {
{"ad5024", ID_AD5024},
+ {"ad5025", ID_AD5025},
{"ad5044", ID_AD5044},
+ {"ad5045", ID_AD5045},
{"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},
+ {"ad5666-1", ID_AD5666_1},
+ {"ad5666-2", ID_AD5666_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);
@@ -448,5 +555,5 @@ static struct spi_driver ad5064_driver = {
module_spi_driver(ad5064_driver);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-MODULE_DESCRIPTION("Analog Devices AD5064/64-1/44/24 DAC");
+MODULE_DESCRIPTION("Analog Devices AD5024/25/44/45/64/64-1/65, AD5628/48/66/68 DAC");
MODULE_LICENSE("GPL v2");
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.