forked from Minki/linux
91d05d7639
Use the created list of of_device_id's as a match table. Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
435 lines
10 KiB
C
435 lines
10 KiB
C
/*
|
|
* ti-dac5571.c - Texas Instruments 8/10/12-bit 1/4-channel DAC driver
|
|
*
|
|
* Copyright (C) 2018 Prevas A/S
|
|
*
|
|
* http://www.ti.com/lit/ds/symlink/dac5571.pdf
|
|
* http://www.ti.com/lit/ds/symlink/dac6571.pdf
|
|
* http://www.ti.com/lit/ds/symlink/dac7571.pdf
|
|
* http://www.ti.com/lit/ds/symlink/dac5574.pdf
|
|
* http://www.ti.com/lit/ds/symlink/dac6574.pdf
|
|
* http://www.ti.com/lit/ds/symlink/dac7574.pdf
|
|
* http://www.ti.com/lit/ds/symlink/dac5573.pdf
|
|
* http://www.ti.com/lit/ds/symlink/dac6573.pdf
|
|
* http://www.ti.com/lit/ds/symlink/dac7573.pdf
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License (version 2) as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of.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;
|
|
u8 powerdown_mode;
|
|
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] ____cacheline_aligned;
|
|
};
|
|
|
|
#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;
|
|
}
|
|
|
|
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 == mode)
|
|
return 0;
|
|
|
|
mutex_lock(&data->lock);
|
|
if (data->powerdown) {
|
|
ret = data->dac5571_pwrdwn(data, chan->channel,
|
|
DAC5571_POWERDOWN(mode));
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
data->powerdown_mode = 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 sprintf(buf, "%d\n", data->powerdown);
|
|
}
|
|
|
|
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 = strtobool(buf, &powerdown);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (data->powerdown == powerdown)
|
|
return len;
|
|
|
|
mutex_lock(&data->lock);
|
|
if (powerdown)
|
|
ret = data->dac5571_pwrdwn(data, chan->channel,
|
|
DAC5571_POWERDOWN(data->powerdown_mode));
|
|
else
|
|
ret = data->dac5571_cmd(data, chan->channel, data->val[0]);
|
|
if (ret)
|
|
goto out;
|
|
|
|
data->powerdown = 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_SHARED_BY_TYPE,
|
|
},
|
|
IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE, &dac5571_powerdown_mode),
|
|
IIO_ENUM_AVAILABLE("powerdown_mode", &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)
|
|
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)
|
|
{
|
|
struct device *dev = &client->dev;
|
|
const struct dac5571_spec *spec;
|
|
struct dac5571_data *data;
|
|
struct iio_dev *indio_dev;
|
|
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->dev.parent = dev;
|
|
indio_dev->dev.of_node = client->dev.of_node;
|
|
indio_dev->info = &dac5571_info;
|
|
indio_dev->name = id->name;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
indio_dev->channels = dac5571_channels;
|
|
|
|
spec = &dac5571_spec[id->driver_data];
|
|
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:
|
|
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 int 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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id dac5571_of_id[] = {
|
|
{.compatible = "ti,dac5571"},
|
|
{.compatible = "ti,dac6571"},
|
|
{.compatible = "ti,dac7571"},
|
|
{.compatible = "ti,dac5574"},
|
|
{.compatible = "ti,dac6574"},
|
|
{.compatible = "ti,dac7574"},
|
|
{.compatible = "ti,dac5573"},
|
|
{.compatible = "ti,dac6573"},
|
|
{.compatible = "ti,dac7573"},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, dac5571_of_id);
|
|
#endif
|
|
|
|
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},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, dac5571_id);
|
|
|
|
static struct i2c_driver dac5571_driver = {
|
|
.driver = {
|
|
.name = "ti-dac5571",
|
|
.of_match_table = of_match_ptr(dac5571_of_id),
|
|
},
|
|
.probe = dac5571_probe,
|
|
.remove = dac5571_remove,
|
|
.id_table = dac5571_id,
|
|
};
|
|
module_i2c_driver(dac5571_driver);
|
|
|
|
MODULE_AUTHOR("Sean Nyekjaer <sean.nyekjaer@prevas.dk>");
|
|
MODULE_DESCRIPTION("Texas Instruments 8/10/12-bit 1/4-channel DAC driver");
|
|
MODULE_LICENSE("GPL v2");
|