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Mon, 18 May 2026 08:22:13 -0700 (PDT) From: Marcelo Schmitt X-Google-Original-From: Marcelo Schmitt Date: Mon, 18 May 2026 12:22:29 -0300 To: linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: jic23@kernel.org, nuno.sa@analog.com, Michael.Hennerich@analog.com, dlechner@baylibre.com, andy@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, marcelo.schmitt1@gmail.com Subject: [PATCH v1 4/4] iio: adc: ltc2378: Enable triggered buffer data capture Message-ID: <986a75b1c92d1a3f0607d1671241db1c8d2ac019.1779117444.git.marcelo.schmitt1@gmail.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: From: Marcelo Schmitt Enable users to run triggered data captures with LTC2378 and similar ADCs. Signed-off-by: Marcelo Schmitt --- drivers/iio/adc/Kconfig | 1 + drivers/iio/adc/ltc2378.c | 39 ++++++++++++++++++++++++++++++++++++--- 2 files changed, 37 insertions(+), 3 deletions(-) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index b5368ee783f7..265c4a2b5fb7 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -944,6 +944,7 @@ config LTC2378 depends on SPI depends on GPIOLIB || PWM select IIO_BUFFER + select IIO_TRIGGERED_BUFFER imply LTC2378_OFFLOAD_BUFFER help Say yes here to build support for Analog Devices LTC2378-20 and diff --git a/drivers/iio/adc/ltc2378.c b/drivers/iio/adc/ltc2378.c index fdbe919d45d5..993e6b09bb41 100644 --- a/drivers/iio/adc/ltc2378.c +++ b/drivers/iio/adc/ltc2378.c @@ -10,6 +10,9 @@ #include #include #include +#include +#include +#include #include #include @@ -272,6 +275,25 @@ static const struct iio_info ltc2378_iio_info = { .read_raw = <c2378_read_raw, }; +static irqreturn_t ltc2378_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *indio_dev = pf->indio_dev; + struct ltc2378_state *st = iio_priv(indio_dev); + int ret; + + ret = ltc2378_convert_and_acquire(st); + if (ret < 0) + goto err_out; + + iio_push_to_buffers_with_ts(indio_dev, &st->scan, sizeof(st->scan), + pf->timestamp); + +err_out: + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; +} + static int ltc2378_probe(struct spi_device *spi) { struct iio_chan_spec *ltc2378_chan; @@ -305,11 +327,11 @@ static int ltc2378_probe(struct spi_device *spi) return dev_err_probe(dev, PTR_ERR(st->cnv_gpio), "failed to get CNV GPIO"); - ltc2378_chan = devm_kzalloc(&spi->dev, sizeof(struct iio_chan_spec), GFP_KERNEL); + ltc2378_chan = devm_kzalloc(&spi->dev, 2 * sizeof(struct iio_chan_spec), GFP_KERNEL); if (!ltc2378_chan) return -ENOMEM; - *ltc2378_chan = (struct iio_chan_spec) { + ltc2378_chan[0] = (struct iio_chan_spec) { .type = IIO_VOLTAGE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), @@ -327,7 +349,18 @@ static int ltc2378_probe(struct spi_device *spi) ret = ltc2378_offload_buffer_setup(indio_dev, spi); if (ret == -ENODEV) { /* SPI offloading is unavailable. Fall back to triggered buffer. */ - dev_notice(dev, "buffered data capture not supported\n"); + ret = devm_iio_triggered_buffer_setup(dev, indio_dev, + &iio_pollfunc_store_time, + <c2378_trigger_handler, + NULL); + if (ret) + return ret; + + /* Add timestamp channel */ + struct iio_chan_spec ts_chan = IIO_CHAN_SOFT_TIMESTAMP(1); + + ltc2378_chan[1] = ts_chan; + num_iio_chans++; } else if (ret) { return dev_err_probe(dev, ret, "error on SPI offload setup\n"); } else { -- 2.53.0