MSA311 is a tri-axial, low-g accelerometer with I2C digital output for sensitivity consumer applications. It has dynamic user-selectable full scales range of +-2g/+-4g/+-8g/+-16g and allows acceleration measurements with output data rates from 1Hz to 1000Hz. Spec: https://cdn-shop.adafruit.com/product-files/5309/MSA311-V1.1-ENG.pdf This driver supports following MSA311 features: - IIO interface - Different power modes: NORMAL and SUSPEND (using pm_runtime) - ODR (Output Data Rate) selection - Scale and samp_freq selection - IIO triggered buffer, IIO reg access - NEW_DATA interrupt + trigger Below features to be done: - Motion Events: ACTIVE, TAP, ORIENT, FREEFALL - Low Power mode Also this patchset has new vendor prefix for MEMSensing Microsystems and MSA311 dt-binding schema. You can test msa311 driver using libiio and gnuplot following below instructions: $ # Create hrtimer trigger object $ mkdir /sys/kernel/config/iio/triggers/hrtimer/iio_hrtimer_trigger $ # Read 4K samples using msa311-13-new-data trigger (irq) and $ # buffer with depth equals to 64 samples and rotate device a little bit $ iio_readdev -u "local:" -b 64 -s 4096 -t msa311-13-new-data -T 0 \ $ msa311-13 > /tmp/msa311.dat $ # Or using hrtimer trigger instead of msa311-13-new-data trigger $ iio_readdev -u "local:" -b 64 -s 4096 -t iio_hrtimer_trigger -T 0 \ $ msa311 > /data/local/tmp/msa311.dat $ cat <<EOF >> msa311_data.gnu set title "MSA311 Accel Data" set key below set xdata time set format x "%H:%M\n%.4S" set xlabel "timestamp" set autoscale y plot 'msa311.dat' binary endian=little \ format='%int16%int16%int16%uint16%uint64' using \ (\$5/1000000000):(int(\$1)/16) title "acc_x" \ with lines,\\ 'msa311.dat' binary endian=little \ format='%int16%int16%int16%uint16%uint64' using \ (\$5/1000000000):(int(\$2)/16) title "acc_y" \ with lines,\\ 'msa311.dat' binary endian=little \ format='%int16%int16%int16%uint16%uint64' using \ (\$5/1000000000):(int(\$3)/16) title "acc_z" with lines EOF $ gnuplot --persist msa311_data.gnu Changes: * v5->v6: - excluded hz units patch series because it was already merged by Andrew Morton to linux-next through the nomm-unstable, refer to https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=0d8f705fc03e2629efa306ed62d5d19ae5c87de1 - deduplicated val/val2 anonymous struct to iio_decimal_fract struct - update pm_runtime information before error handling inside msa311_read_raw_data() - removed null terminator after scnprintf() usage - reworked disabling and unmapping all interrupts to regmap bulk operations - wrapped up some multiline calls a little bit - added zero padding to fractional part of odr logs - replaced blank lines between reg fields definitions with registers names - s/cannot/can't/g * v4->v5: - used chip_name for IRQ and trigger name generation in the form msa311-%partid%-* - split generic with IIO headers - fixup some mathematical forms inside comments - provided small code refactoring for commas, comments, and logs - removed errno value logging from dev_err_probe() calls per Christophe suggestion to avoid extra errno string output - returned INDIO_DIRECT_MODE default initializer for indio_dev->modes - provided pm_runtime_set_active() call during msa311 probing to let runtime PM know that we are starting up with msa311 chip turned on as Jonathan suggested - used HZ units for hz calculations - removed logging contractions - removed double calling of regulator_disable() in the probe error path - used postfix increment operations instead of prefix form :) - used %pe specifier to print errno as a string in the dev_err() - merged with HZ units patchset from https://lore.kernel.org/linux-iio/20220801143811.14817-1-ddrokosov@xxxxxxxxxxxxxx/ - merged with Andy's str_read_write() patch from https://lore.kernel.org/linux-i2c/20220703154232.55549-1-andriy.shevchenko@xxxxxxxxxxxxxxx/ - used str_read_write() string helper inside driver implementation * v3->v4: - totally reworked pm_runtime flow based on Jonathan suggestions - replaced temporary field variable with tmp pointer to field in the MSA311_GENMASK macro helper - removed i2c pointer from MSA311 private context, retrieved it from msa311 object, if anything - added struct device *dev reference to MSA311 private context for easier msa311->dev translation - moved regmap pointer to the beginning of MSA311 private context to save some instructions - refactored 'if' conditions to be positive and shorter - moved msa311_check_partid() and msa311_soft_reset() to separate routines and call them before powerup IP logic during probe() execution - used str_enable_disable() string helper as Andy suggested - used msa311_pwr_modes const char * array to translate power modes to strings - reworked hz->ms translation, used MICROHZ_PER_HZ from the following review: https://lore.kernel.org/linux-iio/20220801143811.14817-1-ddrokosov@xxxxxxxxxxxxxx/ - moved dev_dbg() log about MSA311 compatible chip finding under partid check - refactored stack variables definitions based on "longer lines first" thumb - used 0 instead of INDIO_DIRECT_MODE before iio buffer setup - moved i2c->irq check to msa311_setup_interrupts() - removed dev_dbg() prints from ->resume() and ->suspend() callbacks - removed "description" fields from "interrupts" and i2c "reg" YAML schema nodes - implemented simple power supply for MSA311 (vdd-supply) - reworked shared_by_all info mask to shared_by_type for MSA311 accel channels - tagged datasheet URL link in the commit message - made mutex-based critical section shorter inside odr and fs loop as Jonathan suggested - fixed wording in the commit messages and comments a little bit, refactored some indentations - replaced blank lines between register offset definitions with short comments * v2->v3: - removed MSA311_TIMESTAMP_CHANNEL() macro, used IIO_CHAN_SOFT_TIMESTAMP directly - do not call dev_err_probe() inside functions, which is used not only from probe() path - simplified error handling a little bit - used iio_device_claim_direct_mode() and iio_device_release_direct_mode() to lock attributes when buffer mode is enabled - prohibited sampling frequency changing during buffer usage because otherwise sometimes MSA311 returns outliers when frequency values grow up in the read operation moment - allowed scale value changing when buffer mode is enabled - removed IRQF_TRIGGER_RISING irq flag from irg registration because it's provided from device tree directly - do not switch off autosuspend from powerdown() devm callback, because it's already done from pm_runtime_disable() during devm pm_runtime actions - provided more information why we need force suspend state for MSA311 in the powerdown flow - reworked comments stuff: removed obvious extra comments, provided more details in the complex driver code places * v1->v2: - memsensing vendor prefix was moved to right place by alphabetical order - LOW mode mention was deleted, because LOW mode isn't supported in the current driver version - reworked some enums with gaps to defines - reworked register names as Jonathan mentioned in the v1 - do not use regmap_field API for entire registers - deleted all extra comments - supported info_mask_*_avail bitmaps instead of explicit IIO attrs definitions, implemented read_avail() callback for samp_freq and scale values - msa311 mutex is still used to protect msa311 power transitions, samp_freq/scale tune and axes data handling; described this lock more informative - ask new_data interruption status from appropriate register, do not hold atomic variable for that - optimized reads of axes data by I2C using regmap_bulk API - use dev_err_probe() instead of dev_err() for all probe() code paths - from now all I2C bus communication failures are interpreted as errors - described wait_from_next() semantic better - deleted all unneeded pm wrappers - interpreter all axes data as __le16 type and adjust them to right format (endianness + sign) for raw() flow only - redesigned msa311_fs_table[] to 2D matrix (it's more comfortable format for read_avail() callback) - align and initialize msa311 buffer before pushing properly - use pm_runtime resume and suspend from buffer preenable/postdisable, deleted them from trigger set_state - supported multiple trigger usage (tested with external hrtimer trigger and internal new_data trigger) - moved all irq related stuff to msa311_setup_interrupts() routine - implemented msa311_powerdown() devm release action - reworked initialization of pm_runtime msa311 flow, use autosuspend logic - purged driver remove() callback, because of devm release logic runs all deinit stuff fully - fixed dts bindings problems - changed irq type in the dt-binding description, because interrupt type for msa311 should have the same type as i2c irq, for example using the gpio_intc it's IRQ_TYPE_EDGE_RISING usually. Otherwise we may lose irq map on the second and further insmod attempts Andy Shevchenko (1): lib/string_helpers: Add str_read_write() helper Dmitry Rokosov (3): dt-bindings: vendor-prefixes: add MEMSensing Microsystems Co., Ltd. iio: add MEMSensing MSA311 3-axis accelerometer driver dt-bindings: iio: accel: add dt-binding schema for msa311 accel driver .../bindings/iio/accel/memsensing,msa311.yaml | 53 + .../devicetree/bindings/vendor-prefixes.yaml | 2 + MAINTAINERS | 7 + drivers/iio/accel/Kconfig | 13 + drivers/iio/accel/Makefile | 2 + drivers/iio/accel/msa311.c | 1328 +++++++++++++++++ include/linux/string_helpers.h | 5 + 7 files changed, 1410 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/accel/memsensing,msa311.yaml create mode 100644 drivers/iio/accel/msa311.c -- 2.36.0
