linux/drivers/iio/dac/ltc1660.c
Alexandru Ardelean d3be83244c iio: remove explicit IIO device parent assignment
This patch applies the semantic patch:
@@
expression I, P, SP;
@@
   I = devm_iio_device_alloc(P, SP);
   ...
-  I->dev.parent = P;

It updates 302 files and does 307 deletions.
This semantic patch also removes some comments like
'/* Establish that the iio_dev is a child of the i2c device */'

But this is is only done in case where the block is left empty.

The patch does not seem to cover all cases. It looks like in some cases a
different variable is used in some cases to assign the parent, but it
points to the same reference.
In other cases, the block covered by ... may be just too big to be covered
by the semantic patch.

However, this looks pretty good as well, as it does cover a big bulk of the
drivers that should remove the parent assignment.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2020-06-14 11:49:59 +01:00

250 lines
6.0 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Driver for Linear Technology LTC1665/LTC1660, 8 channels DAC
*
* Copyright (C) 2018 Marcus Folkesson <marcus.folkesson@gmail.com>
*/
#include <linux/bitops.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#define LTC1660_REG_WAKE 0x0
#define LTC1660_REG_DAC_A 0x1
#define LTC1660_REG_DAC_B 0x2
#define LTC1660_REG_DAC_C 0x3
#define LTC1660_REG_DAC_D 0x4
#define LTC1660_REG_DAC_E 0x5
#define LTC1660_REG_DAC_F 0x6
#define LTC1660_REG_DAC_G 0x7
#define LTC1660_REG_DAC_H 0x8
#define LTC1660_REG_SLEEP 0xe
#define LTC1660_NUM_CHANNELS 8
static const struct regmap_config ltc1660_regmap_config = {
.reg_bits = 4,
.val_bits = 12,
};
enum ltc1660_supported_device_ids {
ID_LTC1660,
ID_LTC1665,
};
struct ltc1660_priv {
struct spi_device *spi;
struct regmap *regmap;
struct regulator *vref_reg;
unsigned int value[LTC1660_NUM_CHANNELS];
unsigned int vref_mv;
};
static int ltc1660_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long mask)
{
struct ltc1660_priv *priv = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
*val = priv->value[chan->channel];
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = regulator_get_voltage(priv->vref_reg);
if (*val < 0) {
dev_err(&priv->spi->dev, "failed to read vref regulator: %d\n",
*val);
return *val;
}
/* Convert to mV */
*val /= 1000;
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
default:
return -EINVAL;
}
}
static int ltc1660_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct ltc1660_priv *priv = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (val2 != 0)
return -EINVAL;
if (val < 0 || val > GENMASK(chan->scan_type.realbits - 1, 0))
return -EINVAL;
ret = regmap_write(priv->regmap, chan->channel,
(val << chan->scan_type.shift));
if (!ret)
priv->value[chan->channel] = val;
return ret;
default:
return -EINVAL;
}
}
#define LTC1660_CHAN(chan, bits) { \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.output = 1, \
.channel = chan, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
.scan_type = { \
.sign = 'u', \
.realbits = (bits), \
.storagebits = 16, \
.shift = 12 - (bits), \
}, \
}
#define LTC1660_OCTAL_CHANNELS(bits) { \
LTC1660_CHAN(LTC1660_REG_DAC_A, bits), \
LTC1660_CHAN(LTC1660_REG_DAC_B, bits), \
LTC1660_CHAN(LTC1660_REG_DAC_C, bits), \
LTC1660_CHAN(LTC1660_REG_DAC_D, bits), \
LTC1660_CHAN(LTC1660_REG_DAC_E, bits), \
LTC1660_CHAN(LTC1660_REG_DAC_F, bits), \
LTC1660_CHAN(LTC1660_REG_DAC_G, bits), \
LTC1660_CHAN(LTC1660_REG_DAC_H, bits), \
}
static const struct iio_chan_spec ltc1660_channels[][LTC1660_NUM_CHANNELS] = {
[ID_LTC1660] = LTC1660_OCTAL_CHANNELS(10),
[ID_LTC1665] = LTC1660_OCTAL_CHANNELS(8),
};
static const struct iio_info ltc1660_info = {
.read_raw = &ltc1660_read_raw,
.write_raw = &ltc1660_write_raw,
};
static int __maybe_unused ltc1660_suspend(struct device *dev)
{
struct ltc1660_priv *priv = iio_priv(spi_get_drvdata(
to_spi_device(dev)));
return regmap_write(priv->regmap, LTC1660_REG_SLEEP, 0x00);
}
static int __maybe_unused ltc1660_resume(struct device *dev)
{
struct ltc1660_priv *priv = iio_priv(spi_get_drvdata(
to_spi_device(dev)));
return regmap_write(priv->regmap, LTC1660_REG_WAKE, 0x00);
}
static SIMPLE_DEV_PM_OPS(ltc1660_pm_ops, ltc1660_suspend, ltc1660_resume);
static int ltc1660_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
struct ltc1660_priv *priv;
const struct spi_device_id *id = spi_get_device_id(spi);
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*priv));
if (indio_dev == NULL)
return -ENOMEM;
priv = iio_priv(indio_dev);
priv->regmap = devm_regmap_init_spi(spi, &ltc1660_regmap_config);
if (IS_ERR(priv->regmap)) {
dev_err(&spi->dev, "failed to register spi regmap %ld\n",
PTR_ERR(priv->regmap));
return PTR_ERR(priv->regmap);
}
priv->vref_reg = devm_regulator_get(&spi->dev, "vref");
if (IS_ERR(priv->vref_reg)) {
dev_err(&spi->dev, "vref regulator not specified\n");
return PTR_ERR(priv->vref_reg);
}
ret = regulator_enable(priv->vref_reg);
if (ret) {
dev_err(&spi->dev, "failed to enable vref regulator: %d\n",
ret);
return ret;
}
priv->spi = spi;
spi_set_drvdata(spi, indio_dev);
indio_dev->info = &ltc1660_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = ltc1660_channels[id->driver_data];
indio_dev->num_channels = LTC1660_NUM_CHANNELS;
indio_dev->name = id->name;
ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&spi->dev, "failed to register iio device: %d\n",
ret);
goto error_disable_reg;
}
return 0;
error_disable_reg:
regulator_disable(priv->vref_reg);
return ret;
}
static int ltc1660_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ltc1660_priv *priv = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
regulator_disable(priv->vref_reg);
return 0;
}
static const struct of_device_id ltc1660_dt_ids[] = {
{ .compatible = "lltc,ltc1660", .data = (void *)ID_LTC1660 },
{ .compatible = "lltc,ltc1665", .data = (void *)ID_LTC1665 },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, ltc1660_dt_ids);
static const struct spi_device_id ltc1660_id[] = {
{"ltc1660", ID_LTC1660},
{"ltc1665", ID_LTC1665},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(spi, ltc1660_id);
static struct spi_driver ltc1660_driver = {
.driver = {
.name = "ltc1660",
.of_match_table = ltc1660_dt_ids,
.pm = &ltc1660_pm_ops,
},
.probe = ltc1660_probe,
.remove = ltc1660_remove,
.id_table = ltc1660_id,
};
module_spi_driver(ltc1660_driver);
MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
MODULE_DESCRIPTION("Linear Technology LTC1660/LTC1665 DAC");
MODULE_LICENSE("GPL v2");