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[88.193.135.236]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5b8c270ea53sm398549e87.12.2026.09.18.05.25.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Sep 2026 05:25:23 -0700 (PDT) From: Rupesh Majhi To: Andy Shevchenko , Bill Wendling , David Lechner , Eddie James , Joel Stanley , Jonathan Cameron , Justin Stitt , Nathan Chancellor , Nick Desaulniers , =?UTF-8?q?Nuno=20S=C3=A1?= Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Rupesh Majhi Subject: [PATCH v7 05/10] iio: pressure: dps310: add triggered buffer support Date: Fri, 18 Sep 2026 15:25:12 +0300 Message-ID: <20260918122517.377565-6-zoone.rupert@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260918122517.377565-1-zoone.rupert@gmail.com> References: <20260918122517.377565-1-zoone.rupert@gmail.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add a triggered buffer to capture continuously on both channels instead of one sysfs read at a time. Raw register value is not useful on its own, pressure has to go through the compensation polynomial and needs a temperature reading. Report raw in Pa with 1/1000 scale to keep full resolution in the buffer without changing what the existing processed attribute reports. Raw and processed reads return -EBUSY while buffer is on, so does any reconfiguration. Assisted-by: LLM Signed-off-by: Rupesh Majhi --- drivers/iio/pressure/Kconfig | 2 + drivers/iio/pressure/dps310.c | 151 ++++++++++++++++++++++++++++++++-- 2 files changed, 148 insertions(+), 5 deletions(-) diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig index 838a8340c4c0..cef8b90b9ae7 100644 --- a/drivers/iio/pressure/Kconfig +++ b/drivers/iio/pressure/Kconfig @@ -112,6 +112,8 @@ config DPS310 tristate "Infineon DPS310 pressure and temperature sensor" depends on I2C select REGMAP_I2C + select IIO_BUFFER + select IIO_TRIGGERED_BUFFER help Support for the Infineon DPS310 digital barometric pressure sensor. It can be accessed over I2C bus. diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c index 8cefca928077..dd816d47bbec 100644 --- a/drivers/iio/pressure/dps310.c +++ b/drivers/iio/pressure/dps310.c @@ -22,8 +22,11 @@ #include #include +#include #include #include +#include +#include #define DPS310_DEV_NAME "dps310" @@ -94,19 +97,50 @@ struct dps310_data { bool timeout_recovery_failed; }; +enum dps310_scan_index { + DPS310_SCAN_TEMP, + DPS310_SCAN_PRESSURE, +}; + static const struct iio_chan_spec dps310_channels[] = { { .type = IIO_TEMP, .info_mask_separate = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_PROCESSED), + .scan_index = DPS310_SCAN_TEMP, + .scan_type = { + .sign = 's', + .realbits = 32, + .storagebits = 32, + .endianness = IIO_CPU, + }, }, { .type = IIO_PRESSURE, + /* + * _raw here is already compensated (section 4.9.1, which needs + * a temperature too) and in Pa; _scale converts to the kPa the + * ABI wants. _processed predates buffers and has to stay. + * + * Do not copy this into other drivers. A _raw that is not the + * raw register value is only tolerable because the alternative + * is losing resolution or breaking existing _processed users. + */ .info_mask_separate = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | BIT(IIO_CHAN_INFO_SAMP_FREQ) | + BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_PROCESSED), + .scan_index = DPS310_SCAN_PRESSURE, + .scan_type = { + .sign = 's', + .realbits = 32, + .storagebits = 32, + .endianness = IIO_CPU, + }, }, + IIO_CHAN_SOFT_TIMESTAMP(2), }; /* To be called after checking the COEF_RDY bit in MEAS_CFG */ @@ -586,6 +620,11 @@ static int dps310_write_raw(struct iio_dev *iio, { struct dps310_data *data = iio_priv(iio); + /* Reconfiguring mid-capture would change the values being captured */ + IIO_DEV_ACQUIRE_DIRECT_MODE(iio, claim); + if (IIO_DEV_ACQUIRE_FAILED(claim)) + return -EBUSY; + ACQUIRE(mutex_intr, lock)(&data->lock); if (ACQUIRE_ERR(mutex_intr, &lock)) return -EINTR; @@ -723,6 +762,13 @@ static int dps310_read_pressure(struct dps310_data *data, int *val, int *val2, return IIO_VAL_INT; + case IIO_CHAN_INFO_RAW: + rc = dps310_read_pressure_value(data, val); + if (rc) + return rc; + + return IIO_VAL_INT; + case IIO_CHAN_INFO_PROCESSED: rc = dps310_read_pressure_value(data, val); if (rc) @@ -731,6 +777,12 @@ static int dps310_read_pressure(struct dps310_data *data, int *val, int *val2, *val2 = 1000; /* Convert Pa to KPa per IIO ABI */ return IIO_VAL_FRACTIONAL; + case IIO_CHAN_INFO_SCALE: + /* The raw value is in Pa, the ABI wants kPa */ + *val = 1; + *val2 = 1000; + return IIO_VAL_FRACTIONAL; + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: rc = dps310_get_pres_precision(data, val); if (rc) @@ -812,12 +864,10 @@ static int dps310_read_temp(struct dps310_data *data, int *val, int *val2, } } -static int dps310_read_raw(struct iio_dev *iio, - struct iio_chan_spec const *chan, - int *val, int *val2, long mask) +static int dps310_read_channel(struct dps310_data *data, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) { - struct dps310_data *data = iio_priv(iio); - switch (chan->type) { case IIO_PRESSURE: return dps310_read_pressure(data, val, val2, mask); @@ -830,6 +880,87 @@ static int dps310_read_raw(struct iio_dev *iio, } } +static int dps310_read_raw(struct iio_dev *iio, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct dps310_data *data = iio_priv(iio); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + case IIO_CHAN_INFO_PROCESSED: { + /* This consumes the measurement the capture path reads */ + IIO_DEV_ACQUIRE_DIRECT_MODE(iio, claim); + if (IIO_DEV_ACQUIRE_FAILED(claim)) + return -EBUSY; + + return dps310_read_channel(data, chan, val, val2, mask); + } + default: + return dps310_read_channel(data, chan, val, val2, mask); + } +} + +static int dps310_fill_channels(struct dps310_data *data, + const unsigned long *scan_mask, + s32 channels[2]) + __must_hold(&data->lock) +{ + unsigned int i; + int rc; + + /* Compensation needs a temperature, so it is sampled either way */ + rc = dps310_read_temp_raw_locked(data); + if (rc) + return rc; + + i = 0; + if (test_bit(DPS310_SCAN_TEMP, scan_mask)) { + /* Millidegrees Celsius */ + rc = dps310_calculate_temp(data, &channels[i++]); + if (rc) + return rc; + } + + if (test_bit(DPS310_SCAN_PRESSURE, scan_mask)) { + rc = dps310_read_pres_raw_locked(data); + if (rc) + return rc; + + /* Pascals, see the channel definition */ + rc = dps310_calculate_pressure(data, &channels[i++]); + if (rc) + return rc; + } + + return 0; +} + +static irqreturn_t dps310_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf = p; + struct iio_dev *iio = pf->indio_dev; + struct dps310_data *data = iio_priv(iio); + struct { + s32 channels[2]; + aligned_s64 timestamp; + } scan = { }; + int rc; + + mutex_lock(&data->lock); + rc = dps310_fill_channels(data, iio->active_scan_mask, scan.channels); + mutex_unlock(&data->lock); + if (rc) + goto err; + + iio_push_to_buffers_with_ts(iio, &scan, sizeof(scan), iio_get_time_ns(iio)); + +err: + iio_trigger_notify_done(iio->trig); + + return IRQ_HANDLED; +} + static void dps310_reset(void *action_data) { struct dps310_data *data = action_data; @@ -885,6 +1016,16 @@ static int dps310_probe(struct i2c_client *client) if (rc) return rc; + /* + * The device measures continuously in background mode, so a capture is + * just a read of the latest results. The trigger is not aligned with + * the measurements, so the timestamp is taken in the handler. + */ + rc = devm_iio_triggered_buffer_setup(dev, iio, NULL, + dps310_trigger_handler, NULL); + if (rc) + return rc; + rc = devm_iio_device_register(dev, iio); if (rc) return rc; -- 2.43.0