#include <linux/iio/iio.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/property.h>
#include <linux/regulator/consumer.h>
enum chip_id {
single_8bit, single_10bit, single_12bit,
quad_8bit, quad_10bit, quad_12bit
};
struct dac5571_spec {
u8 num_channels;
u8 resolution;
};
static const struct dac5571_spec dac5571_spec[] = {
[single_8bit] = {.num_channels = 1, .resolution = 8},
[single_10bit] = {.num_channels = 1, .resolution = 10},
[single_12bit] = {.num_channels = 1, .resolution = 12},
[quad_8bit] = {.num_channels = 4, .resolution = 8},
[quad_10bit] = {.num_channels = 4, .resolution = 10},
[quad_12bit] = {.num_channels = 4, .resolution = 12},
};
struct dac5571_data {
struct i2c_client *client;
int id;
struct mutex lock;
struct regulator *vref;
u16 val[4];
bool powerdown[4];
u8 powerdown_mode[4];
struct dac5571_spec const *spec;
int (*dac5571_cmd)(struct dac5571_data *data, int channel, u16 val);
int (*dac5571_pwrdwn)(struct dac5571_data *data, int channel, u8 pwrdwn);
u8 buf[3] __aligned(IIO_DMA_MINALIGN);
};
#define DAC5571_POWERDOWN(mode) ((mode) + 1)
#define DAC5571_POWERDOWN_FLAG BIT(0)
#define DAC5571_CHANNEL_SELECT 1
#define DAC5571_LOADMODE_DIRECT BIT(4)
#define DAC5571_SINGLE_PWRDWN_BITS 4
#define DAC5571_QUAD_PWRDWN_BITS 6
static int dac5571_cmd_single(struct dac5571_data *data, int channel, u16 val)
{
unsigned int shift;
shift = 12 - data->spec->resolution;
data->buf[1] = val << shift;
data->buf[0] = val >> (8 - shift);
if (i2c_master_send(data->client, data->buf, 2) != 2)
return -EIO;
return 0;
}
static int dac5571_cmd_quad(struct dac5571_data *data, int channel, u16 val)
{
unsigned int shift;
shift = 16 - data->spec->resolution;
data->buf[2] = val << shift;
data->buf[1] = (val >> (8 - shift));
data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
DAC5571_LOADMODE_DIRECT;
if (i2c_master_send(data->client, data->buf, 3) != 3)
return -EIO;
return 0;
}
static int dac5571_pwrdwn_single(struct dac5571_data *data, int channel, u8 pwrdwn)
{
data->buf[1] = 0;
data->buf[0] = pwrdwn << DAC5571_SINGLE_PWRDWN_BITS;
if (i2c_master_send(data->client, data->buf, 2) != 2)
return -EIO;
return 0;
}
static int dac5571_pwrdwn_quad(struct dac5571_data *data, int channel, u8 pwrdwn)
{
data->buf[2] = 0;
data->buf[1] = pwrdwn << DAC5571_QUAD_PWRDWN_BITS;
data->buf[0] = (channel << DAC5571_CHANNEL_SELECT) |
DAC5571_LOADMODE_DIRECT | DAC5571_POWERDOWN_FLAG;
if (i2c_master_send(data->client, data->buf, 3) != 3)
return -EIO;
return 0;
}
static const char *const dac5571_powerdown_modes[] = {
"1kohm_to_gnd", "100kohm_to_gnd", "three_state",
};
static int dac5571_get_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct dac5571_data *data = iio_priv(indio_dev);
return data->powerdown_mode[chan->channel];
}
static int dac5571_set_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
unsigned int mode)
{
struct dac5571_data *data = iio_priv(indio_dev);
int ret = 0;
if (data->powerdown_mode[chan->channel] == mode)
return 0;
mutex_lock(&data->lock);
if (data->powerdown[chan->channel]) {
ret = data->dac5571_pwrdwn(data, chan->channel,
DAC5571_POWERDOWN(mode));
if (ret)
goto out;
}
data->powerdown_mode[chan->channel] = mode;
out:
mutex_unlock(&data->lock);
return ret;
}
static const struct iio_enum dac5571_powerdown_mode = {
.items = dac5571_powerdown_modes,
.num_items = ARRAY_SIZE(dac5571_powerdown_modes),
.get = dac5571_get_powerdown_mode,
.set = dac5571_set_powerdown_mode,
};
static ssize_t dac5571_read_powerdown(struct iio_dev *indio_dev,
uintptr_t private,
const struct iio_chan_spec *chan,
char *buf)
{
struct dac5571_data *data = iio_priv(indio_dev);
return sysfs_emit(buf, "%d\n", data->powerdown[chan->channel]);
}
static ssize_t dac5571_write_powerdown(struct iio_dev *indio_dev,
uintptr_t private,
const struct iio_chan_spec *chan,
const char *buf, size_t len)
{
struct dac5571_data *data = iio_priv(indio_dev);
bool powerdown;
int ret;
ret = kstrtobool(buf, &powerdown);
if (ret)
return ret;
if (data->powerdown[chan->channel] == powerdown)
return len;
mutex_lock(&data->lock);
if (powerdown)
ret = data->dac5571_pwrdwn(data, chan->channel,
DAC5571_POWERDOWN(data->powerdown_mode[chan->channel]));
else
ret = data->dac5571_cmd(data, chan->channel,
data->val[chan->channel]);
if (ret)
goto out;
data->powerdown[chan->channel] = powerdown;
out:
mutex_unlock(&data->lock);
return ret ? ret : len;
}
static const struct iio_chan_spec_ext_info dac5571_ext_info[] = {
{
.name = "powerdown",
.read = dac5571_read_powerdown,
.write = dac5571_write_powerdown,
.shared = IIO_SEPARATE,
},
IIO_ENUM("powerdown_mode", IIO_SEPARATE, &dac5571_powerdown_mode),
IIO_ENUM_AVAILABLE("powerdown_mode", IIO_SHARED_BY_TYPE, &dac5571_powerdown_mode),
{},
};
#define dac5571_CHANNEL(chan, name) { \
.type = IIO_VOLTAGE, \
.channel = (chan), \
.address = (chan), \
.indexed = true, \
.output = true, \
.datasheet_name = name, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.ext_info = dac5571_ext_info, \
}
static const struct iio_chan_spec dac5571_channels[] = {
dac5571_CHANNEL(0, "A"),
dac5571_CHANNEL(1, "B"),
dac5571_CHANNEL(2, "C"),
dac5571_CHANNEL(3, "D"),
};
static int dac5571_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct dac5571_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
*val = data->val[chan->channel];
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
ret = regulator_get_voltage(data->vref);
if (ret < 0)
return ret;
*val = ret / 1000;
*val2 = data->spec->resolution;
return IIO_VAL_FRACTIONAL_LOG2;
default:
return -EINVAL;
}
}
static int dac5571_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct dac5571_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (data->val[chan->channel] == val)
return 0;
if (val >= (1 << data->spec->resolution) || val < 0)
return -EINVAL;
if (data->powerdown[chan->channel])
return -EBUSY;
mutex_lock(&data->lock);
ret = data->dac5571_cmd(data, chan->channel, val);
if (ret == 0)
data->val[chan->channel] = val;
mutex_unlock(&data->lock);
return ret;
default:
return -EINVAL;
}
}
static int dac5571_write_raw_get_fmt(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
long mask)
{
return IIO_VAL_INT;
}
static const struct iio_info dac5571_info = {
.read_raw = dac5571_read_raw,
.write_raw = dac5571_write_raw,
.write_raw_get_fmt = dac5571_write_raw_get_fmt,
};
static int dac5571_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct device *dev = &client->dev;
const struct dac5571_spec *spec;
struct dac5571_data *data;
struct iio_dev *indio_dev;
enum chip_id chip_id;
int ret, i;
indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
indio_dev->info = &dac5571_info;
indio_dev->name = id->name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = dac5571_channels;
if (dev_fwnode(dev))
chip_id = (uintptr_t)device_get_match_data(dev);
else
chip_id = id->driver_data;
spec = &dac5571_spec[chip_id];
indio_dev->num_channels = spec->num_channels;
data->spec = spec;
data->vref = devm_regulator_get(dev, "vref");
if (IS_ERR(data->vref))
return PTR_ERR(data->vref);
ret = regulator_enable(data->vref);
if (ret < 0)
return ret;
mutex_init(&data->lock);
switch (spec->num_channels) {
case 1:
data->dac5571_cmd = dac5571_cmd_single;
data->dac5571_pwrdwn = dac5571_pwrdwn_single;
break;
case 4:
data->dac5571_cmd = dac5571_cmd_quad;
data->dac5571_pwrdwn = dac5571_pwrdwn_quad;
break;
default:
ret = -EINVAL;
goto err;
}
for (i = 0; i < spec->num_channels; i++) {
ret = data->dac5571_cmd(data, i, 0);
if (ret) {
dev_err(dev, "failed to initialize channel %d to 0\n", i);
goto err;
}
}
ret = iio_device_register(indio_dev);
if (ret)
goto err;
return 0;
err:
regulator_disable(data->vref);
return ret;
}
static void dac5571_remove(struct i2c_client *i2c)
{
struct iio_dev *indio_dev = i2c_get_clientdata(i2c);
struct dac5571_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
regulator_disable(data->vref);
}
static const struct of_device_id dac5571_of_id[] = {
{.compatible = "ti,dac5571", .data = (void *)single_8bit},
{.compatible = "ti,dac6571", .data = (void *)single_10bit},
{.compatible = "ti,dac7571", .data = (void *)single_12bit},
{.compatible = "ti,dac5574", .data = (void *)quad_8bit},
{.compatible = "ti,dac6574", .data = (void *)quad_10bit},
{.compatible = "ti,dac7574", .data = (void *)quad_12bit},
{.compatible = "ti,dac5573", .data = (void *)quad_8bit},
{.compatible = "ti,dac6573", .data = (void *)quad_10bit},
{.compatible = "ti,dac7573", .data = (void *)quad_12bit},
{.compatible = "ti,dac121c081", .data = (void *)single_12bit},
{}
};
MODULE_DEVICE_TABLE(of, dac5571_of_id);
static const struct i2c_device_id dac5571_id[] = {
{"dac5571", single_8bit},
{"dac6571", single_10bit},
{"dac7571", single_12bit},
{"dac5574", quad_8bit},
{"dac6574", quad_10bit},
{"dac7574", quad_12bit},
{"dac5573", quad_8bit},
{"dac6573", quad_10bit},
{"dac7573", quad_12bit},
{"dac121c081", single_12bit},
{}
};
MODULE_DEVICE_TABLE(i2c, dac5571_id);
static struct i2c_driver dac5571_driver = {
.driver = {
.name = "ti-dac5571",
.of_match_table = dac5571_of_id,
},
.probe = dac5571_probe,
.remove = dac5571_remove,
.id_table = dac5571_id,
};
module_i2c_driver(dac5571_driver);
MODULE_AUTHOR("Sean Nyekjaer <sean@geanix.dk>");
MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver");
MODULE_LICENSE("GPL v2"