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linux-stable/drivers/iio/dac/ad5791.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

470 lines
11 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output Digital to Analog
* Converter
*
* Copyright 2011 Analog Devices Inc.
*/
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
#include <linux/bitops.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/dac/ad5791.h>
#define AD5791_DAC_MASK GENMASK(19, 0)
#define AD5791_CMD_READ BIT(23)
#define AD5791_CMD_WRITE 0
#define AD5791_ADDR(addr) ((addr) << 20)
/* Registers */
#define AD5791_ADDR_NOOP 0
#define AD5791_ADDR_DAC0 1
#define AD5791_ADDR_CTRL 2
#define AD5791_ADDR_CLRCODE 3
#define AD5791_ADDR_SW_CTRL 4
/* Control Register */
#define AD5791_CTRL_RBUF BIT(1)
#define AD5791_CTRL_OPGND BIT(2)
#define AD5791_CTRL_DACTRI BIT(3)
#define AD5791_CTRL_BIN2SC BIT(4)
#define AD5791_CTRL_SDODIS BIT(5)
#define AD5761_CTRL_LINCOMP(x) ((x) << 6)
#define AD5791_LINCOMP_0_10 0
#define AD5791_LINCOMP_10_12 1
#define AD5791_LINCOMP_12_16 2
#define AD5791_LINCOMP_16_19 3
#define AD5791_LINCOMP_19_20 12
#define AD5780_LINCOMP_0_10 0
#define AD5780_LINCOMP_10_20 12
/* Software Control Register */
#define AD5791_SWCTRL_LDAC BIT(0)
#define AD5791_SWCTRL_CLR BIT(1)
#define AD5791_SWCTRL_RESET BIT(2)
#define AD5791_DAC_PWRDN_6K 0
#define AD5791_DAC_PWRDN_3STATE 1
/**
* struct ad5791_chip_info - chip specific information
* @get_lin_comp: function pointer to the device specific function
*/
struct ad5791_chip_info {
int (*get_lin_comp) (unsigned int span);
};
/**
* struct ad5791_state - driver instance specific data
* @spi: spi_device
* @reg_vdd: positive supply regulator
* @reg_vss: negative supply regulator
* @chip_info: chip model specific constants
* @vref_mv: actual reference voltage used
* @vref_neg_mv: voltage of the negative supply
* @pwr_down_mode current power down mode
*/
struct ad5791_state {
struct spi_device *spi;
struct regulator *reg_vdd;
struct regulator *reg_vss;
const struct ad5791_chip_info *chip_info;
unsigned short vref_mv;
unsigned int vref_neg_mv;
unsigned ctrl;
unsigned pwr_down_mode;
bool pwr_down;
union {
__be32 d32;
u8 d8[4];
} data[3] ____cacheline_aligned;
};
/**
* ad5791_supported_device_ids:
*/
enum ad5791_supported_device_ids {
ID_AD5760,
ID_AD5780,
ID_AD5781,
ID_AD5791,
};
static int ad5791_spi_write(struct ad5791_state *st, u8 addr, u32 val)
{
st->data[0].d32 = cpu_to_be32(AD5791_CMD_WRITE |
AD5791_ADDR(addr) |
(val & AD5791_DAC_MASK));
return spi_write(st->spi, &st->data[0].d8[1], 3);
}
static int ad5791_spi_read(struct ad5791_state *st, u8 addr, u32 *val)
{
int ret;
struct spi_transfer xfers[] = {
{
.tx_buf = &st->data[0].d8[1],
.bits_per_word = 8,
.len = 3,
.cs_change = 1,
}, {
.tx_buf = &st->data[1].d8[1],
.rx_buf = &st->data[2].d8[1],
.bits_per_word = 8,
.len = 3,
},
};
st->data[0].d32 = cpu_to_be32(AD5791_CMD_READ |
AD5791_ADDR(addr));
st->data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP));
ret = spi_sync_transfer(st->spi, xfers, ARRAY_SIZE(xfers));
*val = be32_to_cpu(st->data[2].d32);
return ret;
}
static const char * const ad5791_powerdown_modes[] = {
"6kohm_to_gnd",
"three_state",
};
static int ad5791_get_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct ad5791_state *st = iio_priv(indio_dev);
return st->pwr_down_mode;
}
static int ad5791_set_powerdown_mode(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan, unsigned int mode)
{
struct ad5791_state *st = iio_priv(indio_dev);
st->pwr_down_mode = mode;
return 0;
}
static const struct iio_enum ad5791_powerdown_mode_enum = {
.items = ad5791_powerdown_modes,
.num_items = ARRAY_SIZE(ad5791_powerdown_modes),
.get = ad5791_get_powerdown_mode,
.set = ad5791_set_powerdown_mode,
};
static ssize_t ad5791_read_dac_powerdown(struct iio_dev *indio_dev,
uintptr_t private, const struct iio_chan_spec *chan, char *buf)
{
struct ad5791_state *st = iio_priv(indio_dev);
return sprintf(buf, "%d\n", st->pwr_down);
}
static ssize_t ad5791_write_dac_powerdown(struct iio_dev *indio_dev,
uintptr_t private, const struct iio_chan_spec *chan, const char *buf,
size_t len)
{
bool pwr_down;
int ret;
struct ad5791_state *st = iio_priv(indio_dev);
ret = strtobool(buf, &pwr_down);
if (ret)
return ret;
if (!pwr_down) {
st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
} else {
if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K)
st->ctrl |= AD5791_CTRL_OPGND;
else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE)
st->ctrl |= AD5791_CTRL_DACTRI;
}
st->pwr_down = pwr_down;
ret = ad5791_spi_write(st, AD5791_ADDR_CTRL, st->ctrl);
return ret ? ret : len;
}
static int ad5791_get_lin_comp(unsigned int span)
{
if (span <= 10000)
return AD5791_LINCOMP_0_10;
else if (span <= 12000)
return AD5791_LINCOMP_10_12;
else if (span <= 16000)
return AD5791_LINCOMP_12_16;
else if (span <= 19000)
return AD5791_LINCOMP_16_19;
else
return AD5791_LINCOMP_19_20;
}
static int ad5780_get_lin_comp(unsigned int span)
{
if (span <= 10000)
return AD5780_LINCOMP_0_10;
else
return AD5780_LINCOMP_10_20;
}
static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
[ID_AD5760] = {
.get_lin_comp = ad5780_get_lin_comp,
},
[ID_AD5780] = {
.get_lin_comp = ad5780_get_lin_comp,
},
[ID_AD5781] = {
.get_lin_comp = ad5791_get_lin_comp,
},
[ID_AD5791] = {
.get_lin_comp = ad5791_get_lin_comp,
},
};
static int ad5791_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct ad5791_state *st = iio_priv(indio_dev);
u64 val64;
int ret;
switch (m) {
case IIO_CHAN_INFO_RAW:
ret = ad5791_spi_read(st, chan->address, val);
if (ret)
return ret;
*val &= AD5791_DAC_MASK;
*val >>= chan->scan_type.shift;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = st->vref_mv;
*val2 = (1 << chan->scan_type.realbits) - 1;
return IIO_VAL_FRACTIONAL;
case IIO_CHAN_INFO_OFFSET:
val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits);
do_div(val64, st->vref_mv);
*val = -val64;
return IIO_VAL_INT;
default:
return -EINVAL;
}
};
static const struct iio_chan_spec_ext_info ad5791_ext_info[] = {
{
.name = "powerdown",
.shared = IIO_SHARED_BY_TYPE,
.read = ad5791_read_dac_powerdown,
.write = ad5791_write_dac_powerdown,
},
IIO_ENUM("powerdown_mode", IIO_SHARED_BY_TYPE,
&ad5791_powerdown_mode_enum),
IIO_ENUM_AVAILABLE("powerdown_mode", &ad5791_powerdown_mode_enum),
{ },
};
#define AD5791_CHAN(bits, _shift) { \
.type = IIO_VOLTAGE, \
.output = 1, \
.indexed = 1, \
.address = AD5791_ADDR_DAC0, \
.channel = 0, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_OFFSET), \
.scan_type = { \
.sign = 'u', \
.realbits = (bits), \
.storagebits = 24, \
.shift = (_shift), \
}, \
.ext_info = ad5791_ext_info, \
}
static const struct iio_chan_spec ad5791_channels[] = {
[ID_AD5760] = AD5791_CHAN(16, 4),
[ID_AD5780] = AD5791_CHAN(18, 2),
[ID_AD5781] = AD5791_CHAN(18, 2),
[ID_AD5791] = AD5791_CHAN(20, 0)
};
static int ad5791_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct ad5791_state *st = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
val &= GENMASK(chan->scan_type.realbits - 1, 0);
val <<= chan->scan_type.shift;
return ad5791_spi_write(st, chan->address, val);
default:
return -EINVAL;
}
}
static const struct iio_info ad5791_info = {
.read_raw = &ad5791_read_raw,
.write_raw = &ad5791_write_raw,
};
static int ad5791_probe(struct spi_device *spi)
{
struct ad5791_platform_data *pdata = spi->dev.platform_data;
struct iio_dev *indio_dev;
struct ad5791_state *st;
int ret, pos_voltage_uv = 0, neg_voltage_uv = 0;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
st = iio_priv(indio_dev);
st->reg_vdd = devm_regulator_get(&spi->dev, "vdd");
if (!IS_ERR(st->reg_vdd)) {
ret = regulator_enable(st->reg_vdd);
if (ret)
return ret;
ret = regulator_get_voltage(st->reg_vdd);
if (ret < 0)
goto error_disable_reg_pos;
pos_voltage_uv = ret;
}
st->reg_vss = devm_regulator_get(&spi->dev, "vss");
if (!IS_ERR(st->reg_vss)) {
ret = regulator_enable(st->reg_vss);
if (ret)
goto error_disable_reg_pos;
ret = regulator_get_voltage(st->reg_vss);
if (ret < 0)
goto error_disable_reg_neg;
neg_voltage_uv = ret;
}
st->pwr_down = true;
st->spi = spi;
if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) {
st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000;
st->vref_neg_mv = neg_voltage_uv / 1000;
} else if (pdata) {
st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv;
st->vref_neg_mv = pdata->vref_neg_mv;
} else {
dev_warn(&spi->dev, "reference voltage unspecified\n");
}
ret = ad5791_spi_write(st, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
if (ret)
goto error_disable_reg_neg;
st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi)
->driver_data];
st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
| ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |
AD5791_CTRL_BIN2SC;
ret = ad5791_spi_write(st, AD5791_ADDR_CTRL, st->ctrl |
AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
if (ret)
goto error_disable_reg_neg;
spi_set_drvdata(spi, indio_dev);
indio_dev->info = &ad5791_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels
= &ad5791_channels[spi_get_device_id(spi)->driver_data];
indio_dev->num_channels = 1;
indio_dev->name = spi_get_device_id(st->spi)->name;
ret = iio_device_register(indio_dev);
if (ret)
goto error_disable_reg_neg;
return 0;
error_disable_reg_neg:
if (!IS_ERR(st->reg_vss))
regulator_disable(st->reg_vss);
error_disable_reg_pos:
if (!IS_ERR(st->reg_vdd))
regulator_disable(st->reg_vdd);
return ret;
}
static int ad5791_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ad5791_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
if (!IS_ERR(st->reg_vdd))
regulator_disable(st->reg_vdd);
if (!IS_ERR(st->reg_vss))
regulator_disable(st->reg_vss);
return 0;
}
static const struct spi_device_id ad5791_id[] = {
{"ad5760", ID_AD5760},
{"ad5780", ID_AD5780},
{"ad5781", ID_AD5781},
{"ad5790", ID_AD5791},
{"ad5791", ID_AD5791},
{}
};
MODULE_DEVICE_TABLE(spi, ad5791_id);
static struct spi_driver ad5791_driver = {
.driver = {
.name = "ad5791",
},
.probe = ad5791_probe,
.remove = ad5791_remove,
.id_table = ad5791_id,
};
module_spi_driver(ad5791_driver);
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD5760/AD5780/AD5781/AD5790/AD5791 DAC");
MODULE_LICENSE("GPL v2");
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