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drivers:iio:dac:ad5766.c: Add trigger buffer

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This chip is able to generate waveform and using an
with the output trigger buffer will be easy to generate one.

Signed-off-by: Mihail Chindris <mihail.chindris@analog.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Link: https://lore.kernel.org/r/20211007080035.2531-7-mihail.chindris@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Mihail Chindris 2021-10-07 08:00:37 +00:00 committed by Jonathan Cameron
parent c02cd5c19c
commit 885b9790c2
1 changed files with 42 additions and 0 deletions
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42
drivers/iio/dac/ad5766.c
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@ -5,10 +5,13 @@
* Copyright 2019-2020 Analog Devices Inc.
*/
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/module.h>
#include <linux/spi/spi.h>
#include <asm/unaligned.h>
@ -455,6 +458,7 @@ static const struct iio_chan_spec_ext_info ad5766_ext_info[] = {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | \
BIT(IIO_CHAN_INFO_SCALE), \
.scan_index = (_chan), \
.scan_type = { \
.sign = 'u', \
.realbits = (_bits), \
@ -576,6 +580,35 @@ static int ad5766_default_setup(struct ad5766_state *st)
return __ad5766_spi_write(st, AD5766_CMD_SPAN_REG, st->crt_range);
}
static irqreturn_t ad5766_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct iio_buffer *buffer = indio_dev->buffer;
struct ad5766_state *st = iio_priv(indio_dev);
int ret, ch, i;
u16 data[ARRAY_SIZE(ad5766_channels)];
ret = iio_pop_from_buffer(buffer, data);
if (ret)
goto done;
i = 0;
mutex_lock(&st->lock);
for_each_set_bit(ch, indio_dev->active_scan_mask,
st->chip_info->num_channels - 1)
__ad5766_spi_write(st, AD5766_CMD_WR_IN_REG(ch), data[i++]);
__ad5766_spi_write(st, AD5766_CMD_SW_LDAC,
*indio_dev->active_scan_mask);
mutex_unlock(&st->lock);
done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int ad5766_probe(struct spi_device *spi)
{
enum ad5766_type type;
@ -609,6 +642,15 @@ static int ad5766_probe(struct spi_device *spi)
if (ret)
return ret;
/* Configure trigger buffer */
ret = devm_iio_triggered_buffer_setup_ext(&spi->dev, indio_dev, NULL,
ad5766_trigger_handler,
IIO_BUFFER_DIRECTION_OUT,
NULL,
NULL);
if (ret)
return ret;
return devm_iio_device_register(&spi->dev, indio_dev);
}