Commit 885b9790 authored by Mihail Chindris's avatar Mihail Chindris Committed by Jonathan Cameron
Browse files

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



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

Signed-off-by: default avatarMihail Chindris <mihail.chindris@analog.com>
Reviewed-by: default avatarAlexandru Ardelean <ardeleanalex@gmail.com>
Link: https://lore.kernel.org/r/20211007080035.2531-7-mihail.chindris@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent c02cd5c1

drivers/iio/dac/ad5766.c

+42 −0
Original line number Diff line number Diff line
@@ -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);

}