mirror of
https://github.com/torvalds/linux
synced 2024-09-21 11:38:48 +00:00
iio: amplifiers: hmc425a: Add support for HMC425A attenuator
This patch adds support for the HMC425A 0.5 dB LSB GaAs MMIC 6-BIT DIGITAL POSITIVE CONTROL ATTENUATOR, 2.2 - 8.0 GHz. Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/hmc425A.pdf Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com> Signed-off-by: Beniamin Bia <beniamin.bia@analog.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Michael Hennerich
Jonathan Cameron
parent
0cc97f2e46
commit
a76838dfc7
|
|
@ -22,4 +22,14 @@ config AD8366
|
|||
To compile this driver as a module, choose M here: the
|
||||
module will be called ad8366.
|
||||
|
||||
config HMC425
|
||||
tristate "Analog Devices HMC425A and similar GPIO Gain Amplifiers"
|
||||
depends on GPIOLIB
|
||||
help
|
||||
Say yes here to build support for Analog Devices HMC425A and similar
|
||||
gain amplifiers or step attenuators.
|
||||
|
||||
To compile this driver as a module, choose M here: the
|
||||
module will be called hmc425a.
|
||||
|
||||
endmenu
|
||||
|
|
|
|||
|
|
@ -5,3 +5,4 @@
|
|||
|
||||
# When adding new entries keep the list in alphabetical order
|
||||
obj-$(CONFIG_AD8366) += ad8366.o
|
||||
obj-$(CONFIG_HMC425) += hmc425a.o
|
||||
|
|
|
|||
248
drivers/iio/amplifiers/hmc425a.c
Normal file
248
drivers/iio/amplifiers/hmc425a.c
Normal file
|
|
@ -0,0 +1,248 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* HMC425A and similar Gain Amplifiers
|
||||
*
|
||||
* Copyright 2020 Analog Devices Inc.
|
||||
*/
|
||||
|
||||
#include <linux/device.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/gpio/consumer.h>
|
||||
#include <linux/iio/iio.h>
|
||||
#include <linux/iio/sysfs.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of_device.h>
|
||||
#include <linux/of_platform.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/regulator/consumer.h>
|
||||
#include <linux/sysfs.h>
|
||||
|
||||
enum hmc425a_type {
|
||||
ID_HMC425A,
|
||||
};
|
||||
|
||||
struct hmc425a_chip_info {
|
||||
const char *name;
|
||||
const struct iio_chan_spec *channels;
|
||||
unsigned int num_channels;
|
||||
unsigned int num_gpios;
|
||||
int gain_min;
|
||||
int gain_max;
|
||||
int default_gain;
|
||||
};
|
||||
|
||||
struct hmc425a_state {
|
||||
struct regulator *reg;
|
||||
struct mutex lock; /* protect sensor state */
|
||||
struct hmc425a_chip_info *chip_info;
|
||||
struct gpio_descs *gpios;
|
||||
enum hmc425a_type type;
|
||||
u32 gain;
|
||||
};
|
||||
|
||||
static int hmc425a_write(struct iio_dev *indio_dev, u32 value)
|
||||
{
|
||||
struct hmc425a_state *st = iio_priv(indio_dev);
|
||||
DECLARE_BITMAP(values, BITS_PER_TYPE(value));
|
||||
|
||||
values[0] = value;
|
||||
|
||||
gpiod_set_array_value_cansleep(st->gpios->ndescs, st->gpios->desc,
|
||||
NULL, values);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int hmc425a_read_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan, int *val,
|
||||
int *val2, long m)
|
||||
{
|
||||
struct hmc425a_state *st = iio_priv(indio_dev);
|
||||
int code, gain = 0;
|
||||
int ret;
|
||||
|
||||
mutex_lock(&st->lock);
|
||||
switch (m) {
|
||||
case IIO_CHAN_INFO_HARDWAREGAIN:
|
||||
code = st->gain;
|
||||
|
||||
switch (st->type) {
|
||||
case ID_HMC425A:
|
||||
gain = ~code * -500;
|
||||
break;
|
||||
}
|
||||
|
||||
*val = gain / 1000;
|
||||
*val2 = (gain % 1000) * 1000;
|
||||
|
||||
ret = IIO_VAL_INT_PLUS_MICRO_DB;
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
mutex_unlock(&st->lock);
|
||||
|
||||
return ret;
|
||||
};
|
||||
|
||||
static int hmc425a_write_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan, int val,
|
||||
int val2, long mask)
|
||||
{
|
||||
struct hmc425a_state *st = iio_priv(indio_dev);
|
||||
struct hmc425a_chip_info *inf = st->chip_info;
|
||||
int code = 0, gain;
|
||||
int ret;
|
||||
|
||||
if (val < 0)
|
||||
gain = (val * 1000) - (val2 / 1000);
|
||||
else
|
||||
gain = (val * 1000) + (val2 / 1000);
|
||||
|
||||
if (gain > inf->gain_max || gain < inf->gain_min)
|
||||
return -EINVAL;
|
||||
|
||||
switch (st->type) {
|
||||
case ID_HMC425A:
|
||||
code = ~((abs(gain) / 500) & 0x3F);
|
||||
break;
|
||||
}
|
||||
|
||||
mutex_lock(&st->lock);
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_HARDWAREGAIN:
|
||||
st->gain = code;
|
||||
|
||||
ret = hmc425a_write(indio_dev, st->gain);
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
mutex_unlock(&st->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int hmc425a_write_raw_get_fmt(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
long mask)
|
||||
{
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_HARDWAREGAIN:
|
||||
return IIO_VAL_INT_PLUS_MICRO_DB;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
}
|
||||
|
||||
static const struct iio_info hmc425a_info = {
|
||||
.read_raw = &hmc425a_read_raw,
|
||||
.write_raw = &hmc425a_write_raw,
|
||||
.write_raw_get_fmt = &hmc425a_write_raw_get_fmt,
|
||||
};
|
||||
|
||||
#define HMC425A_CHAN(_channel) \
|
||||
{ \
|
||||
.type = IIO_VOLTAGE, \
|
||||
.output = 1, \
|
||||
.indexed = 1, \
|
||||
.channel = _channel, \
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_HARDWAREGAIN), \
|
||||
}
|
||||
|
||||
static const struct iio_chan_spec hmc425a_channels[] = {
|
||||
HMC425A_CHAN(0),
|
||||
};
|
||||
|
||||
/* Match table for of_platform binding */
|
||||
static const struct of_device_id hmc425a_of_match[] = {
|
||||
{ .compatible = "adi,hmc425a", .data = (void *)ID_HMC425A },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, hmc425a_of_match);
|
||||
|
||||
static void hmc425a_reg_disable(void *data)
|
||||
{
|
||||
struct hmc425a_state *st = data;
|
||||
|
||||
regulator_disable(st->reg);
|
||||
}
|
||||
|
||||
static struct hmc425a_chip_info hmc425a_chip_info_tbl[] = {
|
||||
[ID_HMC425A] = {
|
||||
.name = "hmc425a",
|
||||
.channels = hmc425a_channels,
|
||||
.num_channels = ARRAY_SIZE(hmc425a_channels),
|
||||
.num_gpios = 6,
|
||||
.gain_min = -31500,
|
||||
.gain_max = 0,
|
||||
.default_gain = -0x40, /* set default gain -31.5db*/
|
||||
},
|
||||
};
|
||||
|
||||
static int hmc425a_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct iio_dev *indio_dev;
|
||||
struct hmc425a_state *st;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st));
|
||||
if (!indio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
st = iio_priv(indio_dev);
|
||||
st->type = (enum hmc425a_type)of_device_get_match_data(&pdev->dev);
|
||||
|
||||
st->chip_info = &hmc425a_chip_info_tbl[st->type];
|
||||
indio_dev->num_channels = st->chip_info->num_channels;
|
||||
indio_dev->channels = st->chip_info->channels;
|
||||
indio_dev->name = st->chip_info->name;
|
||||
st->gain = st->chip_info->default_gain;
|
||||
|
||||
st->gpios = devm_gpiod_get_array(&pdev->dev, "ctrl", GPIOD_OUT_LOW);
|
||||
if (IS_ERR(st->gpios)) {
|
||||
ret = PTR_ERR(st->gpios);
|
||||
if (ret != -EPROBE_DEFER)
|
||||
dev_err(&pdev->dev, "failed to get gpios\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (st->gpios->ndescs != st->chip_info->num_gpios) {
|
||||
dev_err(&pdev->dev, "%d GPIOs needed to operate\n",
|
||||
st->chip_info->num_gpios);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
st->reg = devm_regulator_get(&pdev->dev, "vcc-supply");
|
||||
if (IS_ERR(st->reg))
|
||||
return PTR_ERR(st->reg);
|
||||
|
||||
ret = regulator_enable(st->reg);
|
||||
if (ret)
|
||||
return ret;
|
||||
ret = devm_add_action_or_reset(&pdev->dev, hmc425a_reg_disable, st);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
mutex_init(&st->lock);
|
||||
|
||||
indio_dev->dev.parent = &pdev->dev;
|
||||
indio_dev->info = &hmc425a_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
|
||||
return devm_iio_device_register(&pdev->dev, indio_dev);
|
||||
}
|
||||
|
||||
static struct platform_driver hmc425a_driver = {
|
||||
.driver = {
|
||||
.name = KBUILD_MODNAME,
|
||||
.of_match_table = hmc425a_of_match,
|
||||
},
|
||||
.probe = hmc425a_probe,
|
||||
};
|
||||
module_platform_driver(hmc425a_driver);
|
||||
|
||||
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
|
||||
MODULE_DESCRIPTION("Analog Devices HMC425A and similar GPIO control Gain Amplifiers");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Loading…
Reference in a new issue