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Subject[PATCH v5 6/6] drivers:iio:dac:ad5766.c: Add trigger buffer
Date
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>
---
drivers/iio/dac/ad5766.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)

diff --git a/drivers/iio/dac/ad5766.c b/drivers/iio/dac/ad5766.c
index dafda84fdea3..71491e6d466e 100644
--- a/drivers/iio/dac/ad5766.c
+++ b/drivers/iio/dac/ad5766.c
@@ -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>
@@ -41,6 +44,7 @@
#define AD5766_CMD_DITHER_SCALE_2 0xD0

#define AD5766_FULL_RESET_CODE 0x1234
+#define AD5766_NUM_CH 16

enum ad5766_type {
ID_AD5766,
@@ -455,6 +459,7 @@ 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 +581,28 @@ 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 *buf = indio_dev->buffer;
+ int ret, ch, i;
+ u16 data[AD5766_NUM_CH];
+
+ ret = iio_pop_from_buffer(buf, (u8 *)data);
+ if (ret)
+ goto done;
+
+ i = 0;
+ for_each_set_bit(ch, indio_dev->active_scan_mask, AD5766_NUM_CH - 1)
+ ad5766_write(indio_dev, ch, le16_to_cpu(data[i++]));
+
+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 +636,15 @@ 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);
}

--
2.27.0
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