diff options
| author | Mihail Chindris <mihail.chindris@analog.com> | 2021-10-07 11:00:37 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2021-10-19 10:30:45 +0300 |
| commit | 885b9790c25a5fb8b253971c107744b17d8c29e7 (patch) | |
| tree | e588c39a94ccb2972ed05371591ae8884e1f8d46 /drivers/iio | |
| parent | c02cd5c19c17698f12b731e898127095f9bc2921 (diff) | |
| download | linux-885b9790c25a5fb8b253971c107744b17d8c29e7.tar.xz | |
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: 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>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/dac/ad5766.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/iio/dac/ad5766.c b/drivers/iio/dac/ad5766.c index 3104ec32dfac..2b1edcb25444 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> @@ -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); } |