staging: iio: ad2s1200: Move driver out of staging
Move the iio driver for the ad2s1200 and ad2s1205 resolver-to-digital converter out of staging, into mainline iio subsystems. Signed-off-by: David Veenstra <davidjulianveenstra@gmail.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
David Veenstra
committed by
Jonathan Cameron
Jonathan Cameron
parent
9c3e81ab74
commit
ad28d31554
210
drivers/iio/resolver/ad2s1200.c
Normal file
210
drivers/iio/resolver/ad2s1200.c
Normal file
@@ -0,0 +1,210 @@
|
||||
/*
|
||||
* ad2s1200.c simple support for the ADI Resolver to Digital Converters:
|
||||
* AD2S1200/1205
|
||||
*
|
||||
* Copyright (c) 2018-2018 David Veenstra <davidjulianveenstra@gmail.com>
|
||||
* Copyright (c) 2010-2010 Analog Devices Inc.
|
||||
*
|
||||
* 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/bitops.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/device.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/gpio/consumer.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/spi/spi.h>
|
||||
#include <linux/sysfs.h>
|
||||
#include <linux/types.h>
|
||||
|
||||
#include <linux/iio/iio.h>
|
||||
#include <linux/iio/sysfs.h>
|
||||
|
||||
#define DRV_NAME "ad2s1200"
|
||||
|
||||
/* input clock on serial interface */
|
||||
#define AD2S1200_HZ 8192000
|
||||
/* clock period in nano second */
|
||||
#define AD2S1200_TSCLK (1000000000 / AD2S1200_HZ)
|
||||
|
||||
/**
|
||||
* struct ad2s1200_state - driver instance specific data.
|
||||
* @lock: protects both the GPIO pins and the rx buffer.
|
||||
* @sdev: spi device.
|
||||
* @sample: GPIO pin SAMPLE.
|
||||
* @rdvel: GPIO pin RDVEL.
|
||||
* @rx: buffer for spi transfers.
|
||||
*/
|
||||
struct ad2s1200_state {
|
||||
struct mutex lock;
|
||||
struct spi_device *sdev;
|
||||
struct gpio_desc *sample;
|
||||
struct gpio_desc *rdvel;
|
||||
__be16 rx ____cacheline_aligned;
|
||||
};
|
||||
|
||||
static int ad2s1200_read_raw(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int *val,
|
||||
int *val2,
|
||||
long m)
|
||||
{
|
||||
struct ad2s1200_state *st = iio_priv(indio_dev);
|
||||
int ret;
|
||||
|
||||
switch (m) {
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
switch (chan->type) {
|
||||
case IIO_ANGL:
|
||||
/* 2 * Pi / (2^12 - 1) ~= 0.001534355 */
|
||||
*val = 0;
|
||||
*val2 = 1534355;
|
||||
return IIO_VAL_INT_PLUS_NANO;
|
||||
case IIO_ANGL_VEL:
|
||||
/* 2 * Pi ~= 6.283185 */
|
||||
*val = 6;
|
||||
*val2 = 283185;
|
||||
return IIO_VAL_INT_PLUS_MICRO;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
break;
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
mutex_lock(&st->lock);
|
||||
gpiod_set_value(st->sample, 0);
|
||||
|
||||
/* delay (6 * AD2S1200_TSCLK + 20) nano seconds */
|
||||
udelay(1);
|
||||
gpiod_set_value(st->sample, 1);
|
||||
gpiod_set_value(st->rdvel, !!(chan->type == IIO_ANGL));
|
||||
|
||||
ret = spi_read(st->sdev, &st->rx, 2);
|
||||
if (ret < 0) {
|
||||
mutex_unlock(&st->lock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
switch (chan->type) {
|
||||
case IIO_ANGL:
|
||||
*val = be16_to_cpup(&st->rx) >> 4;
|
||||
break;
|
||||
case IIO_ANGL_VEL:
|
||||
*val = sign_extend32(be16_to_cpup(&st->rx) >> 4, 11);
|
||||
break;
|
||||
default:
|
||||
mutex_unlock(&st->lock);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* delay (2 * AD2S1200_TSCLK + 20) ns for sample pulse */
|
||||
udelay(1);
|
||||
mutex_unlock(&st->lock);
|
||||
|
||||
return IIO_VAL_INT;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static const struct iio_chan_spec ad2s1200_channels[] = {
|
||||
{
|
||||
.type = IIO_ANGL,
|
||||
.indexed = 1,
|
||||
.channel = 0,
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
|
||||
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
|
||||
}, {
|
||||
.type = IIO_ANGL_VEL,
|
||||
.indexed = 1,
|
||||
.channel = 0,
|
||||
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
|
||||
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
|
||||
}
|
||||
};
|
||||
|
||||
static const struct iio_info ad2s1200_info = {
|
||||
.read_raw = ad2s1200_read_raw,
|
||||
};
|
||||
|
||||
static int ad2s1200_probe(struct spi_device *spi)
|
||||
{
|
||||
struct ad2s1200_state *st;
|
||||
struct iio_dev *indio_dev;
|
||||
int ret;
|
||||
|
||||
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
|
||||
if (!indio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
spi_set_drvdata(spi, indio_dev);
|
||||
st = iio_priv(indio_dev);
|
||||
mutex_init(&st->lock);
|
||||
st->sdev = spi;
|
||||
|
||||
st->sample = devm_gpiod_get(&spi->dev, "adi,sample", GPIOD_OUT_LOW);
|
||||
if (IS_ERR(st->sample)) {
|
||||
dev_err(&spi->dev, "Failed to claim SAMPLE gpio: err=%ld\n",
|
||||
PTR_ERR(st->sample));
|
||||
return PTR_ERR(st->sample);
|
||||
}
|
||||
|
||||
st->rdvel = devm_gpiod_get(&spi->dev, "adi,rdvel", GPIOD_OUT_LOW);
|
||||
if (IS_ERR(st->rdvel)) {
|
||||
dev_err(&spi->dev, "Failed to claim RDVEL gpio: err=%ld\n",
|
||||
PTR_ERR(st->rdvel));
|
||||
return PTR_ERR(st->rdvel);
|
||||
}
|
||||
|
||||
indio_dev->dev.parent = &spi->dev;
|
||||
indio_dev->info = &ad2s1200_info;
|
||||
indio_dev->modes = INDIO_DIRECT_MODE;
|
||||
indio_dev->channels = ad2s1200_channels;
|
||||
indio_dev->num_channels = ARRAY_SIZE(ad2s1200_channels);
|
||||
indio_dev->name = spi_get_device_id(spi)->name;
|
||||
|
||||
spi->max_speed_hz = AD2S1200_HZ;
|
||||
spi->mode = SPI_MODE_3;
|
||||
ret = spi_setup(spi);
|
||||
|
||||
if (ret < 0) {
|
||||
dev_err(&spi->dev, "spi_setup failed!\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
return devm_iio_device_register(&spi->dev, indio_dev);
|
||||
}
|
||||
|
||||
static const struct of_device_id ad2s1200_of_match[] = {
|
||||
{ .compatible = "adi,ad2s1200", },
|
||||
{ .compatible = "adi,ad2s1205", },
|
||||
{ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, ad2s1200_of_match);
|
||||
|
||||
static const struct spi_device_id ad2s1200_id[] = {
|
||||
{ "ad2s1200" },
|
||||
{ "ad2s1205" },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, ad2s1200_id);
|
||||
|
||||
static struct spi_driver ad2s1200_driver = {
|
||||
.driver = {
|
||||
.name = DRV_NAME,
|
||||
.of_match_table = of_match_ptr(ad2s1200_of_match),
|
||||
},
|
||||
.probe = ad2s1200_probe,
|
||||
.id_table = ad2s1200_id,
|
||||
};
|
||||
module_spi_driver(ad2s1200_driver);
|
||||
|
||||
MODULE_AUTHOR("David Veenstra <davidjulianveenstra@gmail.com>");
|
||||
MODULE_AUTHOR("Graff Yang <graff.yang@gmail.com>");
|
||||
MODULE_DESCRIPTION("Analog Devices AD2S1200/1205 Resolver to Digital SPI driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
Reference in New Issue
Block a user