mirror of
https://github.com/torvalds/linux
synced 2024-10-02 09:18:22 +00:00
81ca5979b6
Support for the ROHM BM1390 pressure sensor. The BM1390GLV-Z can measure pressures ranging from 300 hPa to 1300 hPa with configurable measurement averaging and internal FIFO. The sensor does also provide temperature measurements. Sensor does also contain IIR filter implemented in HW. The data-sheet says the IIR filter can be configured to be "weak", "middle" or "strong". Some RMS noise figures are provided in data sheet but no accurate maths for the filter configurations is provided. Hence, the IIR filter configuration is not supported by this driver and the filter is configured to the "middle" setting (at least not for now). The FIFO measurement mode is only measuring the pressure and not the temperature. The driver measures temperature when FIFO is flushed and simply uses the same measured temperature value to all reported temperatures. This should not be a problem when temperature is not changing very rapidly (several degrees C / second) but allows users to get the temperature measurements from sensor without any additional logic. This driver allows the sensor to be used in two muitually exclusive ways, 1. With trigger (data-ready IRQ). In this case the FIFO is not used as we get data ready for each collected sample. Instead, for each data-ready IRQ we read the sample from sensor and push it to the IIO buffer. 2. With hardware FIFO and watermark IRQ. In this case the data-ready is not used but we enable watermark IRQ. At each watermark IRQ we go and read all samples in FIFO and push them to the IIO buffer. Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com> Link: https://lore.kernel.org/r/4f23211e3cf248f9f48ddb2a752387bb00e9c2c4.1695727471.git.mazziesaccount@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> |
||
|---|---|---|
| .. | ||
| accel | ||
| adc | ||
| addac | ||
| afe | ||
| amplifiers | ||
| buffer | ||
| cdc | ||
| chemical | ||
| common | ||
| dac | ||
| dummy | ||
| filter | ||
| frequency | ||
| gyro | ||
| health | ||
| humidity | ||
| imu | ||
| light | ||
| magnetometer | ||
| multiplexer | ||
| orientation | ||
| position | ||
| potentiometer | ||
| potentiostat | ||
| pressure | ||
| proximity | ||
| resolver | ||
| temperature | ||
| test | ||
| trigger | ||
| iio_core.h | ||
| iio_core_trigger.h | ||
| industrialio-buffer.c | ||
| industrialio-configfs.c | ||
| industrialio-core.c | ||
| industrialio-event.c | ||
| industrialio-gts-helper.c | ||
| industrialio-sw-device.c | ||
| industrialio-sw-trigger.c | ||
| industrialio-trigger.c | ||
| industrialio-triggered-event.c | ||
| inkern.c | ||
| Kconfig | ||
| Makefile | ||
| TODO | ||