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linux/drivers/iio/dac/ad5064.c
Mike Looijmans b2d2d2bfca iio:ad5064: Add support for ltc2633 and similar devices 
The Linear Technology LTC2631, LTC2633 and LTC2635 are very similar
to the AD5064 device, in particular the LTC2627.

This patch adds support for those devices. Only the LTC2633 has been
tested, which is the 2-channel variant. The LTC2631 is the 1-channel,
and the LTC2635 the 4-channel version. The actual DAC resolution depends
on the exact chip type and can be 12, 10 or 8 bits, using the upper bits
so this has no effect on the register map. The internal reference is set
to 2.5V on "L" versions, and it's 4.096V for "H" versions.

Datasheets:
    LTC2631: http://www.linear.com/docs/26553
    LTC2633: http://www.linear.com/docs/39529
    LTC2635: http://www.linear.com/docs/28754

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2017-05-14 16:16:57 +01:00

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/*
* 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, LTC2631, LTC2633, LTC2635
* Digital to analog converters driver
*
* Copyright 2011 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/regulator/consumer.h>
#include <asm/unaligned.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#define AD5064_MAX_DAC_CHANNELS 8
#define AD5064_MAX_VREFS 4
#define AD5064_ADDR(x) ((x) << 20)
#define AD5064_CMD(x) ((x) << 24)
#define AD5064_ADDR_ALL_DAC 0xF
#define AD5064_CMD_WRITE_INPUT_N 0x0
#define AD5064_CMD_UPDATE_DAC_N 0x1
#define AD5064_CMD_WRITE_INPUT_N_UPDATE_ALL 0x2
#define AD5064_CMD_WRITE_INPUT_N_UPDATE_N 0x3
#define AD5064_CMD_POWERDOWN_DAC 0x4
#define AD5064_CMD_CLEAR 0x5
#define AD5064_CMD_LDAC_MASK 0x6
#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)
#define AD5064_LDAC_PWRDN_NONE 0x0
#define AD5064_LDAC_PWRDN_1K 0x1
#define AD5064_LDAC_PWRDN_100K 0x2
#define AD5064_LDAC_PWRDN_3STATE 0x3
/**
* enum ad5064_regmap_type - Register layout variant
* @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,
};
/**
* 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
* @regmap_type: register map layout variant
*/
struct ad5064_chip_info {
bool shared_vref;
unsigned long internal_vref;
const struct iio_chan_spec *channels;
unsigned int num_channels;
enum ad5064_regmap_type regmap_type;
};
struct ad5064_state;
typedef int (*ad5064_write_func)(struct ad5064_state *st, unsigned int cmd,
unsigned int addr, unsigned int val);
/**
* struct ad5064_state - driver instance specific data
* @dev: the device for this driver instance
* @chip_info: chip model specific constants, available modes etc
* @vref_reg: vref supply regulators
* @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.
* @write: register write callback
* @data: i2c/spi transfer buffers
*/
struct ad5064_state {
struct device *dev;
const struct ad5064_chip_info *chip_info;
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;
ad5064_write_func write;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
*/
union {
u8 i2c[3];
__be32 spi;
} data ____cacheline_aligned;
};
enum ad5064_type {
ID_AD5024,
ID_AD5025,
ID_AD5044,
ID_AD5045,
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,
ID_AD5669_2,
ID_LTC2606,
ID_LTC2607,
ID_LTC2609,
ID_LTC2616,
ID_LTC2617,
ID_LTC2619,
ID_LTC2626,
ID_LTC2627,
ID_LTC2629,
ID_LTC2631_L12,
ID_LTC2631_H12,
ID_LTC2631_L10,
ID_LTC2631_H10,
ID_LTC2631_L8,
ID_LTC2631_H8,
ID_LTC2633_L12,
ID_LTC2633_H12,
ID_LTC2633_L10,
ID_LTC2633_H10,
ID_LTC2633_L8,
ID_LTC2633_H8,
ID_LTC2635_L12,
ID_LTC2635_H12,
ID_LTC2635_L10,
ID_LTC2635_H10,
ID_LTC2635_L8,
ID_LTC2635_H8,
};
static int ad5064_write(struct ad5064_state *st, unsigned int cmd,
unsigned int addr, unsigned int val, unsigned int shift)
{
val <<= shift;
return st->write(st, cmd, addr, val);
}
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 {
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] << shift;
}
ret = ad5064_write(st, AD5064_CMD_POWERDOWN_DAC, address, val, 0);
return ret;
}
static const char * const ad5064_powerdown_modes[] = {
"1kohm_to_gnd",
"100kohm_to_gnd",
"three_state",
};
static const char * const ltc2617_powerdown_modes[] = {
"90kohm_to_gnd",
};
static int ad5064_get_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct ad5064_state *st = iio_priv(indio_dev);
return st->pwr_down_mode[chan->channel] - 1;
}
static int ad5064_set_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, unsigned int mode)
{
struct ad5064_state *st = iio_priv(indio_dev);
int ret;
mutex_lock(&indio_dev->mlock);
st->pwr_down_mode[chan->channel] = mode + 1;
ret = ad5064_sync_powerdown_mode(st, chan);
mutex_unlock(&indio_dev->mlock);
return ret;
}
static const struct iio_enum ad5064_powerdown_mode_enum = {
.items = ad5064_powerdown_modes,
.num_items = ARRAY_SIZE(ad5064_powerdown_modes),
.get = ad5064_get_powerdown_mode,
.set = ad5064_set_powerdown_mode,
};
static const struct iio_enum ltc2617_powerdown_mode_enum = {
.items = ltc2617_powerdown_modes,
.num_items = ARRAY_SIZE(ltc2617_powerdown_modes),
.get = ad5064_get_powerdown_mode,
.set = ad5064_set_powerdown_mode,
};
static ssize_t ad5064_read_dac_powerdown(struct iio_dev *indio_dev,
uintptr_t private, const struct iio_chan_spec *chan, char *buf)
{
struct ad5064_state *st = iio_priv(indio_dev);
return sprintf(buf, "%d\n", st->pwr_down[chan->channel]);
}
static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev,
uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
size_t len)
{
struct ad5064_state *st = iio_priv(indio_dev);
bool pwr_down;
int ret;
ret = strtobool(buf, &pwr_down);
if (ret)
return ret;
mutex_lock(&indio_dev->mlock);
st->pwr_down[chan->channel] = pwr_down;
ret = ad5064_sync_powerdown_mode(st, chan);
mutex_unlock(&indio_dev->mlock);
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);
int scale_uv;
switch (m) {
case IIO_CHAN_INFO_RAW:
*val = st->dac_cache[chan->channel];
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
scale_uv = ad5064_get_vref(st, chan);
if (scale_uv < 0)
return scale_uv;
*val = scale_uv / 1000;
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
default:
break;
}
return -EINVAL;
}
static int ad5064_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val, int val2, long mask)
{
struct ad5064_state *st = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (val >= (1 << chan->scan_type.realbits) || val < 0)
return -EINVAL;
mutex_lock(&indio_dev->mlock);
ret = ad5064_write(st, AD5064_CMD_WRITE_INPUT_N_UPDATE_N,
chan->address, val, chan->scan_type.shift);
if (ret == 0)
st->dac_cache[chan->channel] = val;
mutex_unlock(&indio_dev->mlock);
break;
default:
ret = -EINVAL;
}
return ret;
}
static const struct iio_info ad5064_info = {
.read_raw = ad5064_read_raw,
.write_raw = ad5064_write_raw,
.driver_module = THIS_MODULE,
};
static const struct iio_chan_spec_ext_info ad5064_ext_info[] = {
{
.name = "powerdown",
.read = ad5064_read_dac_powerdown,
.write = ad5064_write_dac_powerdown,
.shared = IIO_SEPARATE,
},
IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ad5064_powerdown_mode_enum),
IIO_ENUM_AVAILABLE("powerdown_mode", &ad5064_powerdown_mode_enum),
{ },
};
static const struct iio_chan_spec_ext_info ltc2617_ext_info[] = {
{
.name = "powerdown",
.read = ad5064_read_dac_powerdown,
.write = ad5064_write_dac_powerdown,
.shared = IIO_SEPARATE,
},
IIO_ENUM("powerdown_mode", IIO_SEPARATE, &ltc2617_powerdown_mode_enum),
IIO_ENUM_AVAILABLE("powerdown_mode", &ltc2617_powerdown_mode_enum),
{ },
};
#define AD5064_CHANNEL(chan, addr, bits, _shift, _ext_info) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.output = 1, \
.channel = (chan), \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SCALE), \
.address = addr, \
.scan_type = { \
.sign = 'u', \
.realbits = (bits), \
.storagebits = 16, \
.shift = (_shift), \
}, \
.ext_info = (_ext_info), \
}
#define DECLARE_AD5064_CHANNELS(name, bits, shift, ext_info) \
const struct iio_chan_spec name[] = { \
AD5064_CHANNEL(0, 0, bits, shift, ext_info), \
AD5064_CHANNEL(1, 1, bits, shift, ext_info), \
AD5064_CHANNEL(2, 2, bits, shift, ext_info), \
AD5064_CHANNEL(3, 3, bits, shift, ext_info), \
AD5064_CHANNEL(4, 4, bits, shift, ext_info), \
AD5064_CHANNEL(5, 5, bits, shift, ext_info), \
AD5064_CHANNEL(6, 6, bits, shift, ext_info), \
AD5064_CHANNEL(7, 7, bits, shift, ext_info), \
}
#define DECLARE_AD5065_CHANNELS(name, bits, shift, ext_info) \
const struct iio_chan_spec name[] = { \
AD5064_CHANNEL(0, 0, bits, shift, ext_info), \
AD5064_CHANNEL(1, 3, bits, shift, ext_info), \
}
static DECLARE_AD5064_CHANNELS(ad5024_channels, 12, 8, ad5064_ext_info);
static DECLARE_AD5064_CHANNELS(ad5044_channels, 14, 6, ad5064_ext_info);
static DECLARE_AD5064_CHANNELS(ad5064_channels, 16, 4, ad5064_ext_info);
static DECLARE_AD5065_CHANNELS(ad5025_channels, 12, 8, ad5064_ext_info);
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);
static DECLARE_AD5064_CHANNELS(ltc2617_channels, 14, 2, ltc2617_ext_info);
static DECLARE_AD5064_CHANNELS(ltc2627_channels, 12, 4, ltc2617_ext_info);
#define ltc2631_12_channels ltc2627_channels
static DECLARE_AD5064_CHANNELS(ltc2631_10_channels, 10, 6, ltc2617_ext_info);
static DECLARE_AD5064_CHANNELS(ltc2631_8_channels, 8, 8, ltc2617_ext_info);
#define LTC2631_INFO(vref, pchannels, nchannels) \
{ \
.shared_vref = true, \
.internal_vref = vref, \
.channels = pchannels, \
.num_channels = nchannels, \
.regmap_type = AD5064_REGMAP_LTC, \
}
static const struct ad5064_chip_info ad5064_chip_info_tbl[] = {
[ID_AD5024] = {
.shared_vref = false,
.channels = ad5024_channels,
.num_channels = 4,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5025] = {
.shared_vref = false,
.channels = ad5025_channels,
.num_channels = 2,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5044] = {
.shared_vref = false,
.channels = ad5044_channels,
.num_channels = 4,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5045] = {
.shared_vref = false,
.channels = ad5045_channels,
.num_channels = 2,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5064] = {
.shared_vref = false,
.channels = ad5064_channels,
.num_channels = 4,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5064_1] = {
.shared_vref = true,
.channels = ad5064_channels,
.num_channels = 4,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5065] = {
.shared_vref = false,
.channels = ad5065_channels,
.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,
.channels = ad5024_channels,
.num_channels = 8,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5628_2] = {
.shared_vref = true,
.internal_vref = 5000000,
.channels = ad5024_channels,
.num_channels = 8,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5629_1] = {
.shared_vref = true,
.internal_vref = 2500000,
.channels = ad5629_channels,
.num_channels = 8,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5629_2] = {
.shared_vref = true,
.internal_vref = 5000000,
.channels = ad5629_channels,
.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,
.channels = ad5044_channels,
.num_channels = 8,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5648_2] = {
.shared_vref = true,
.internal_vref = 5000000,
.channels = ad5044_channels,
.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,
.channels = ad5064_channels,
.num_channels = 4,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5666_2] = {
.shared_vref = true,
.internal_vref = 5000000,
.channels = ad5064_channels,
.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,
.channels = ad5064_channels,
.num_channels = 8,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5668_2] = {
.shared_vref = true,
.internal_vref = 5000000,
.channels = ad5064_channels,
.num_channels = 8,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5669_1] = {
.shared_vref = true,
.internal_vref = 2500000,
.channels = ad5669_channels,
.num_channels = 8,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_AD5669_2] = {
.shared_vref = true,
.internal_vref = 5000000,
.channels = ad5669_channels,
.num_channels = 8,
.regmap_type = AD5064_REGMAP_ADI,
},
[ID_LTC2606] = {
.shared_vref = true,
.internal_vref = 0,
.channels = ltc2607_channels,
.num_channels = 1,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2607] = {
.shared_vref = true,
.internal_vref = 0,
.channels = ltc2607_channels,
.num_channels = 2,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2609] = {
.shared_vref = false,
.internal_vref = 0,
.channels = ltc2607_channels,
.num_channels = 4,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2616] = {
.shared_vref = true,
.internal_vref = 0,
.channels = ltc2617_channels,
.num_channels = 1,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2617] = {
.shared_vref = true,
.internal_vref = 0,
.channels = ltc2617_channels,
.num_channels = 2,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2619] = {
.shared_vref = false,
.internal_vref = 0,
.channels = ltc2617_channels,
.num_channels = 4,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2626] = {
.shared_vref = true,
.internal_vref = 0,
.channels = ltc2627_channels,
.num_channels = 1,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2627] = {
.shared_vref = true,
.internal_vref = 0,
.channels = ltc2627_channels,
.num_channels = 2,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2629] = {
.shared_vref = false,
.internal_vref = 0,
.channels = ltc2627_channels,
.num_channels = 4,
.regmap_type = AD5064_REGMAP_LTC,
},
[ID_LTC2631_L12] = LTC2631_INFO(2500000, ltc2631_12_channels, 1),
[ID_LTC2631_H12] = LTC2631_INFO(4096000, ltc2631_12_channels, 1),
[ID_LTC2631_L10] = LTC2631_INFO(2500000, ltc2631_10_channels, 1),
[ID_LTC2631_H10] = LTC2631_INFO(4096000, ltc2631_10_channels, 1),
[ID_LTC2631_L8] = LTC2631_INFO(2500000, ltc2631_8_channels, 1),
[ID_LTC2631_H8] = LTC2631_INFO(4096000, ltc2631_8_channels, 1),
[ID_LTC2633_L12] = LTC2631_INFO(2500000, ltc2631_12_channels, 2),
[ID_LTC2633_H12] = LTC2631_INFO(4096000, ltc2631_12_channels, 2),
[ID_LTC2633_L10] = LTC2631_INFO(2500000, ltc2631_10_channels, 2),
[ID_LTC2633_H10] = LTC2631_INFO(4096000, ltc2631_10_channels, 2),
[ID_LTC2633_L8] = LTC2631_INFO(2500000, ltc2631_8_channels, 2),
[ID_LTC2633_H8] = LTC2631_INFO(4096000, ltc2631_8_channels, 2),
[ID_LTC2635_L12] = LTC2631_INFO(2500000, ltc2631_12_channels, 4),
[ID_LTC2635_H12] = LTC2631_INFO(4096000, ltc2631_12_channels, 4),
[ID_LTC2635_L10] = LTC2631_INFO(2500000, ltc2631_10_channels, 4),
[ID_LTC2635_H10] = LTC2631_INFO(4096000, ltc2631_10_channels, 4),
[ID_LTC2635_L8] = LTC2631_INFO(2500000, ltc2631_8_channels, 4),
[ID_LTC2635_H8] = LTC2631_INFO(4096000, ltc2631_8_channels, 4),
};
static inline unsigned int ad5064_num_vref(struct ad5064_state *st)
{
return st->chip_info->shared_vref ? 1 : st->chip_info->num_channels;
}
static const char * const ad5064_vref_names[] = {
"vrefA",
"vrefB",
"vrefC",
"vrefD",
};
static const char * const ad5064_vref_name(struct ad5064_state *st,
unsigned int vref)
{
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)
{
struct iio_dev *indio_dev;
struct ad5064_state *st;
unsigned int midscale;
unsigned int i;
int ret;
indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
if (indio_dev == NULL)
return -ENOMEM;
st = iio_priv(indio_dev);
dev_set_drvdata(dev, indio_dev);
st->chip_info = &ad5064_chip_info_tbl[type];
st->dev = dev;
st->write = write;
for (i = 0; i < ad5064_num_vref(st); ++i)
st->vref_reg[i].supply = ad5064_vref_name(st, i);
ret = devm_regulator_bulk_get(dev, ad5064_num_vref(st),
st->vref_reg);
if (ret) {
if (!st->chip_info->internal_vref)
return ret;
st->use_internal_vref = true;
ret = ad5064_set_config(st, AD5064_CONFIG_INT_VREF_ENABLE);
if (ret) {
dev_err(dev, "Failed to enable internal vref: %d\n",
ret);
return ret;
}
} else {
ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg);
if (ret)
return ret;
}
indio_dev->dev.parent = dev;
indio_dev->name = name;
indio_dev->info = &ad5064_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = st->chip_info->channels;
indio_dev->num_channels = st->chip_info->num_channels;
midscale = (1 << indio_dev->channels[0].scan_type.realbits) / 2;
for (i = 0; i < st->chip_info->num_channels; ++i) {
st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K;
st->dac_cache[i] = midscale;
}
ret = iio_device_register(indio_dev);
if (ret)
goto error_disable_reg;
return 0;
error_disable_reg:
if (!st->use_internal_vref)
regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
return ret;
}
static int ad5064_remove(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5064_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
if (!st->use_internal_vref)
regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg);
return 0;
}
#if IS_ENABLED(CONFIG_SPI_MASTER)
static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd,
unsigned int addr, unsigned int val)
{
struct spi_device *spi = to_spi_device(st->dev);
st->data.spi = cpu_to_be32(AD5064_CMD(cmd) | AD5064_ADDR(addr) | val);
return spi_write(spi, &st->data.spi, sizeof(st->data.spi));
}
static int ad5064_spi_probe(struct spi_device *spi)
{
const struct spi_device_id *id = spi_get_device_id(spi);
return ad5064_probe(&spi->dev, id->driver_data, id->name,
ad5064_spi_write);
}
static int ad5064_spi_remove(struct spi_device *spi)
{
return ad5064_remove(&spi->dev);
}
static const struct spi_device_id ad5064_spi_ids[] = {
{"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_spi_ids);
static struct spi_driver ad5064_spi_driver = {
.driver = {
.name = "ad5064",
},
.probe = ad5064_spi_probe,
.remove = ad5064_spi_remove,
.id_table = ad5064_spi_ids,
};
static int __init ad5064_spi_register_driver(void)
{
return spi_register_driver(&ad5064_spi_driver);
}
static void ad5064_spi_unregister_driver(void)
{
spi_unregister_driver(&ad5064_spi_driver);
}
#else
static inline int ad5064_spi_register_driver(void) { return 0; }
static inline void ad5064_spi_unregister_driver(void) { }
#endif
#if IS_ENABLED(CONFIG_I2C)
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;
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);
if (ret < 0)
return ret;
return 0;
}
static int ad5064_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
return ad5064_probe(&i2c->dev, id->driver_data, id->name,
ad5064_i2c_write);
}
static int ad5064_i2c_remove(struct i2c_client *i2c)
{
return ad5064_remove(&i2c->dev);
}
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 */
{"ltc2606", ID_LTC2606},
{"ltc2607", ID_LTC2607},
{"ltc2609", ID_LTC2609},
{"ltc2616", ID_LTC2616},
{"ltc2617", ID_LTC2617},
{"ltc2619", ID_LTC2619},
{"ltc2626", ID_LTC2626},
{"ltc2627", ID_LTC2627},
{"ltc2629", ID_LTC2629},
{"ltc2631-l12", ID_LTC2631_L12},
{"ltc2631-h12", ID_LTC2631_H12},
{"ltc2631-l10", ID_LTC2631_L10},
{"ltc2631-h10", ID_LTC2631_H10},
{"ltc2631-l8", ID_LTC2631_L8},
{"ltc2631-h8", ID_LTC2631_H8},
{"ltc2633-l12", ID_LTC2633_L12},
{"ltc2633-h12", ID_LTC2633_H12},
{"ltc2633-l10", ID_LTC2633_L10},
{"ltc2633-h10", ID_LTC2633_H10},
{"ltc2633-l8", ID_LTC2633_L8},
{"ltc2633-h8", ID_LTC2633_H8},
{"ltc2635-l12", ID_LTC2635_L12},
{"ltc2635-h12", ID_LTC2635_H12},
{"ltc2635-l10", ID_LTC2635_L10},
{"ltc2635-h10", ID_LTC2635_H10},
{"ltc2635-l8", ID_LTC2635_L8},
{"ltc2635-h8", ID_LTC2635_H8},
{}
};
MODULE_DEVICE_TABLE(i2c, ad5064_i2c_ids);
static struct i2c_driver ad5064_i2c_driver = {
.driver = {
.name = "ad5064",
},
.probe = ad5064_i2c_probe,
.remove = ad5064_i2c_remove,
.id_table = ad5064_i2c_ids,
};
static int __init ad5064_i2c_register_driver(void)
{
return i2c_add_driver(&ad5064_i2c_driver);
}
static void __exit ad5064_i2c_unregister_driver(void)
{
i2c_del_driver(&ad5064_i2c_driver);
}
#else
static inline int ad5064_i2c_register_driver(void) { return 0; }
static inline void ad5064_i2c_unregister_driver(void) { }
#endif
static int __init ad5064_init(void)
{
int ret;
ret = ad5064_spi_register_driver();
if (ret)
return ret;
ret = ad5064_i2c_register_driver();
if (ret) {
ad5064_spi_unregister_driver();
return ret;
}
return 0;
}
module_init(ad5064_init);
static void __exit ad5064_exit(void)
{
ad5064_i2c_unregister_driver();
ad5064_spi_unregister_driver();
}
module_exit(ad5064_exit);
MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("Analog Devices AD5024 and similar multi-channel DACs");
MODULE_LICENSE("GPL v2");
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