Re: [RFC PATCH 0/5] iio: move 'modes' initialization to core

From: Jonathan Cameron
Date: Sat Dec 05 2020 - 13:29:23 EST

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Previous message: Jonathan Cameron: "Re: [PATCH v2 2/2] iio: dac: ad5766: add driver support for AD5766"
In reply to: Alexandru Ardelean: "[RFC PATCH 2/5] iio,counter: remove modes init for INDIO_DIRECT_MODE only drivers"
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On Thu, 3 Dec 2020 12:04:18 +0200
Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> wrote:

> I stumbled over this, while trying to implement some changes to the IIO
> buffer logic.
> Seems that most drivers have a INDIO_DIRECT_MODE, and some have
> INDIO_BUFFER_SOFTWARE only as a workaround for not having multiple IIO
> buffer-support-per-IIO-device (yet).

Examples of that particular corner case would be good from a discussion
point of view.

It's been a while though and those cases were always 'interesting'
so I may have misremembered how it works!

It is definitely also used to indicate cases where there is no trigger
to expose (usually devices doing DMA blocks or using a fifo).
That was the original intent IIRC.

>
> Since a lot of drivers seem to only support INDIO_DIRECT_MODE, it begs the
> question whether this starts to make sense as a default 'modes'
> initialization.

Hmm. Do we need to set it at all, or can we just make it implicit?
I'm not sure if that is semantically worse than having it set by default
or not. Thinking about it I think we do want to set it just for
consistency purposes.

I'm a bit in two minds about this set. It obviously is a noop from
functional point of view, but it's kind of nice to see the modes
explicitly called out. I guess we started walking down this route
anyway when we set IIO_TRIGGERED_BUFFER inside those setup routines.

The bit that bothers me is that it isn't really a 'default' as such
it just the most common value. I wonder if we could be more clever
and set it only if there as a channel with _RAW or _PROCESSED
though that would involve moving it to the registration rather than
creation.

Jonathan

>
> It opens up the idea of hiding 'indio_dev->modes' inside IIO core, with
> functions like '{devm_}iio_triggered_buffer_setup()' being able to extend
> the setup of these 'modes'.
> This idea is far from being ready, but I thought I'd try this RFC instead
> as a discussion starter in that direction.
>
> Alexandru Ardelean (5):
> iio: core: initialize 'modes' to INDIO_DIRECT_MODE by default
> iio,counter: remove modes init for INDIO_DIRECT_MODE only drivers
> iio: remove modes init for INDIO_DIRECT_MODE only drivers (manual)
> iio: adc: ad7768-1: remove explicit modes initialization
> iio: magnetometer: rm3100: remove explicit modes initialization
>
> drivers/counter/104-quad-8.c | 1 -
> drivers/iio/accel/adis16201.c | 1 -
> drivers/iio/accel/adis16209.c | 1 -
> drivers/iio/accel/adxl345_core.c | 1 -
> drivers/iio/accel/bma180.c | 1 -
> drivers/iio/accel/bma220_spi.c | 1 -
> drivers/iio/accel/bma400_core.c | 1 -
> drivers/iio/accel/bmc150-accel-core.c | 1 -
> drivers/iio/accel/da280.c | 1 -
> drivers/iio/accel/da311.c | 1 -
> drivers/iio/accel/dmard06.c | 1 -
> drivers/iio/accel/dmard09.c | 1 -
> drivers/iio/accel/dmard10.c | 1 -
> drivers/iio/accel/hid-sensor-accel-3d.c | 1 -
> drivers/iio/accel/kxcjk-1013.c | 1 -
> drivers/iio/accel/kxsd9.c | 1 -
> drivers/iio/accel/mc3230.c | 1 -
> drivers/iio/accel/mma7455_core.c | 1 -
> drivers/iio/accel/mma7660.c | 1 -
> drivers/iio/accel/mma8452.c | 1 -
> drivers/iio/accel/mma9551.c | 1 -
> drivers/iio/accel/mma9553.c | 1 -
> drivers/iio/accel/mxc4005.c | 1 -
> drivers/iio/accel/mxc6255.c | 1 -
> drivers/iio/accel/sca3000.c | 1 -
> drivers/iio/accel/st_accel_core.c | 1 -
> drivers/iio/accel/stk8312.c | 1 -
> drivers/iio/accel/stk8ba50.c | 1 -
> drivers/iio/adc/ab8500-gpadc.c | 1 -
> drivers/iio/adc/ad7091r-base.c | 1 -
> drivers/iio/adc/ad7124.c | 1 -
> drivers/iio/adc/ad7192.c | 1 -
> drivers/iio/adc/ad7266.c | 1 -
> drivers/iio/adc/ad7291.c | 1 -
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> drivers/iio/adc/ad7476.c | 1 -
> drivers/iio/adc/ad7606.c | 1 -
> drivers/iio/adc/ad7766.c | 1 -
> drivers/iio/adc/ad7768-1.c | 1 -
> drivers/iio/adc/ad7780.c | 1 -
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> drivers/iio/adc/ad7793.c | 1 -
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> drivers/iio/adc/ad7949.c | 1 -
> drivers/iio/adc/ad799x.c | 1 -
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> drivers/iio/adc/cc10001_adc.c | 1 -
> drivers/iio/adc/da9150-gpadc.c | 1 -
> drivers/iio/adc/dln2-adc.c | 1 -
> drivers/iio/adc/ep93xx_adc.c | 1 -
> drivers/iio/adc/exynos_adc.c | 1 -
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> drivers/iio/adc/imx7d_adc.c | 1 -
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> drivers/iio/adc/lpc18xx_adc.c | 1 -
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> drivers/iio/adc/ltc2497-core.c | 1 -
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> drivers/iio/adc/mt6577_auxadc.c | 1 -
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> drivers/iio/adc/nau7802.c | 1 -
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> drivers/iio/adc/palmas_gpadc.c | 1 -
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> drivers/iio/adc/rn5t618-adc.c | 1 -
> drivers/iio/adc/rockchip_saradc.c | 1 -
> drivers/iio/adc/sc27xx_adc.c | 1 -
> drivers/iio/adc/spear_adc.c | 1 -
> drivers/iio/adc/stm32-dfsdm-adc.c | 1 -
> drivers/iio/adc/stmpe-adc.c | 1 -
> drivers/iio/adc/stx104.c | 1 -
> drivers/iio/adc/sun4i-gpadc-iio.c | 1 -
> drivers/iio/adc/ti-adc081c.c | 1 -
> drivers/iio/adc/ti-adc0832.c | 1 -
> drivers/iio/adc/ti-adc084s021.c | 1 -
> drivers/iio/adc/ti-adc108s102.c | 1 -
> drivers/iio/adc/ti-adc12138.c | 1 -
> drivers/iio/adc/ti-adc128s052.c | 1 -
> drivers/iio/adc/ti-adc161s626.c | 1 -
> drivers/iio/adc/ti-ads1015.c | 1 -
> drivers/iio/adc/ti-ads124s08.c | 1 -
> drivers/iio/adc/ti-ads7950.c | 1 -
> drivers/iio/adc/ti-ads8344.c | 1 -
> drivers/iio/adc/ti-ads8688.c | 1 -
> drivers/iio/adc/ti-tlc4541.c | 1 -
> drivers/iio/adc/ti_am335x_adc.c | 1 -
> drivers/iio/adc/twl4030-madc.c | 1 -
> drivers/iio/adc/twl6030-gpadc.c | 1 -
> drivers/iio/adc/vf610_adc.c | 1 -
> drivers/iio/adc/viperboard_adc.c | 1 -
> drivers/iio/adc/xilinx-xadc-core.c | 1 -
> drivers/iio/afe/iio-rescale.c | 1 -
> drivers/iio/amplifiers/ad8366.c | 1 -
> drivers/iio/amplifiers/hmc425a.c | 1 -
> drivers/iio/chemical/ams-iaq-core.c | 1 -
> drivers/iio/chemical/atlas-ezo-sensor.c | 1 -
> drivers/iio/chemical/bme680_core.c | 1 -
> drivers/iio/chemical/ccs811.c | 1 -
> drivers/iio/chemical/pms7003.c | 1 -
> drivers/iio/chemical/scd30_core.c | 1 -
> drivers/iio/chemical/sgp30.c | 1 -
> drivers/iio/chemical/sps30.c | 1 -
> drivers/iio/chemical/vz89x.c | 1 -
> drivers/iio/dac/ad5064.c | 1 -
> drivers/iio/dac/ad5360.c | 1 -
> drivers/iio/dac/ad5380.c | 1 -
> drivers/iio/dac/ad5421.c | 1 -
> drivers/iio/dac/ad5446.c | 1 -
> drivers/iio/dac/ad5449.c | 1 -
> drivers/iio/dac/ad5504.c | 1 -
> drivers/iio/dac/ad5592r-base.c | 1 -
> drivers/iio/dac/ad5624r_spi.c | 1 -
> drivers/iio/dac/ad5686.c | 1 -
> drivers/iio/dac/ad5755.c | 1 -
> drivers/iio/dac/ad5758.c | 1 -
> drivers/iio/dac/ad5761.c | 1 -
> drivers/iio/dac/ad5764.c | 1 -
> drivers/iio/dac/ad5770r.c | 1 -
> drivers/iio/dac/ad5791.c | 1 -
> drivers/iio/dac/ad7303.c | 1 -
> drivers/iio/dac/ad8801.c | 1 -
> drivers/iio/dac/cio-dac.c | 1 -
> drivers/iio/dac/dpot-dac.c | 1 -
> drivers/iio/dac/ds4424.c | 1 -
> drivers/iio/dac/lpc18xx_dac.c | 1 -
> drivers/iio/dac/ltc1660.c | 1 -
> drivers/iio/dac/ltc2632.c | 1 -
> drivers/iio/dac/m62332.c | 1 -
> drivers/iio/dac/max517.c | 1 -
> drivers/iio/dac/max5821.c | 1 -
> drivers/iio/dac/mcp4725.c | 1 -
> drivers/iio/dac/mcp4922.c | 1 -
> drivers/iio/dac/stm32-dac.c | 1 -
> drivers/iio/dac/ti-dac082s085.c | 1 -
> drivers/iio/dac/ti-dac5571.c | 1 -
> drivers/iio/dac/ti-dac7311.c | 1 -
> drivers/iio/dac/ti-dac7612.c | 1 -
> drivers/iio/dac/vf610_dac.c | 1 -
> drivers/iio/dummy/iio_simple_dummy.c | 3 ---
> drivers/iio/frequency/ad9523.c | 1 -
> drivers/iio/frequency/adf4350.c | 1 -
> drivers/iio/frequency/adf4371.c | 1 -
> drivers/iio/gyro/adis16080.c | 1 -
> drivers/iio/gyro/adis16130.c | 1 -
> drivers/iio/gyro/adis16136.c | 1 -
> drivers/iio/gyro/adis16260.c | 1 -
> drivers/iio/gyro/adxrs290.c | 1 -
> drivers/iio/gyro/adxrs450.c | 1 -
> drivers/iio/gyro/bmg160_core.c | 1 -
> drivers/iio/gyro/fxas21002c_core.c | 1 -
> drivers/iio/gyro/hid-sensor-gyro-3d.c | 1 -
> drivers/iio/gyro/itg3200_core.c | 1 -
> drivers/iio/gyro/mpu3050-core.c | 1 -
> drivers/iio/gyro/st_gyro_core.c | 1 -
> drivers/iio/health/afe4403.c | 1 -
> drivers/iio/health/afe4404.c | 1 -
> drivers/iio/humidity/am2315.c | 1 -
> drivers/iio/humidity/dht11.c | 1 -
> drivers/iio/humidity/hdc100x.c | 1 -
> drivers/iio/humidity/hdc2010.c | 1 -
> drivers/iio/humidity/hid-sensor-humidity.c | 1 -
> drivers/iio/humidity/hts221_core.c | 1 -
> drivers/iio/humidity/htu21.c | 1 -
> drivers/iio/humidity/si7005.c | 1 -
> drivers/iio/humidity/si7020.c | 1 -
> drivers/iio/imu/adis16400.c | 1 -
> drivers/iio/imu/adis16460.c | 1 -
> drivers/iio/imu/adis16475.c | 1 -
> drivers/iio/imu/adis16480.c | 1 -
> drivers/iio/imu/bmi160/bmi160_core.c | 1 -
> drivers/iio/imu/fxos8700_core.c | 1 -
> drivers/iio/imu/kmx61.c | 1 -
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 1 -
> drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_shub.c | 1 -
> drivers/iio/industrialio-core.c | 1 +
> drivers/iio/light/adjd_s311.c | 1 -
> drivers/iio/light/adux1020.c | 1 -
> drivers/iio/light/al3010.c | 1 -
> drivers/iio/light/al3320a.c | 1 -
> drivers/iio/light/apds9300.c | 1 -
> drivers/iio/light/as73211.c | 1 -
> drivers/iio/light/bh1750.c | 1 -
> drivers/iio/light/bh1780.c | 1 -
> drivers/iio/light/cm32181.c | 1 -
> drivers/iio/light/cm3232.c | 1 -
> drivers/iio/light/cm3323.c | 1 -
> drivers/iio/light/cm3605.c | 1 -
> drivers/iio/light/cm36651.c | 1 -
> drivers/iio/light/gp2ap002.c | 1 -
> drivers/iio/light/gp2ap020a00f.c | 1 -
> drivers/iio/light/hid-sensor-als.c | 1 -
> drivers/iio/light/hid-sensor-prox.c | 1 -
> drivers/iio/light/iqs621-als.c | 1 -
> drivers/iio/light/isl29018.c | 1 -
> drivers/iio/light/isl29028.c | 1 -
> drivers/iio/light/isl29125.c | 1 -
> drivers/iio/light/jsa1212.c | 1 -
> drivers/iio/light/lm3533-als.c | 1 -
> drivers/iio/light/ltr501.c | 1 -
> drivers/iio/light/lv0104cs.c | 1 -
> drivers/iio/light/max44009.c | 1 -
> drivers/iio/light/noa1305.c | 1 -
> drivers/iio/light/opt3001.c | 1 -
> drivers/iio/light/pa12203001.c | 1 -
> drivers/iio/light/rpr0521.c | 1 -
> drivers/iio/light/si1133.c | 1 -
> drivers/iio/light/si1145.c | 1 -
> drivers/iio/light/st_uvis25_core.c | 1 -
> drivers/iio/light/stk3310.c | 1 -
> drivers/iio/light/tcs3414.c | 1 -
> drivers/iio/light/tcs3472.c | 1 -
> drivers/iio/light/tsl2563.c | 1 -
> drivers/iio/light/tsl2583.c | 1 -
> drivers/iio/light/tsl2772.c | 1 -
> drivers/iio/light/tsl4531.c | 1 -
> drivers/iio/light/us5182d.c | 1 -
> drivers/iio/light/vcnl4000.c | 1 -
> drivers/iio/light/vcnl4035.c | 1 -
> drivers/iio/light/veml6030.c | 1 -
> drivers/iio/light/veml6070.c | 1 -
> drivers/iio/light/vl6180.c | 1 -
> drivers/iio/light/zopt2201.c | 1 -
> drivers/iio/magnetometer/ak8974.c | 1 -
> drivers/iio/magnetometer/ak8975.c | 1 -
> drivers/iio/magnetometer/bmc150_magn.c | 1 -
> drivers/iio/magnetometer/hid-sensor-magn-3d.c | 1 -
> drivers/iio/magnetometer/hmc5843_core.c | 1 -
> drivers/iio/magnetometer/mag3110.c | 1 -
> drivers/iio/magnetometer/mmc35240.c | 1 -
> drivers/iio/magnetometer/rm3100-core.c | 1 -
> drivers/iio/magnetometer/st_magn_core.c | 1 -
> drivers/iio/multiplexer/iio-mux.c | 1 -
> drivers/iio/orientation/hid-sensor-incl-3d.c | 1 -
> drivers/iio/orientation/hid-sensor-rotation.c | 1 -
> drivers/iio/position/iqs624-pos.c | 1 -
> drivers/iio/potentiometer/max5481.c | 1 -
> drivers/iio/potentiometer/max5487.c | 1 -
> drivers/iio/potentiostat/lmp91000.c | 1 -
> drivers/iio/pressure/abp060mg.c | 1 -
> drivers/iio/pressure/bmp280-core.c | 1 -
> drivers/iio/pressure/dlhl60d.c | 1 -
> drivers/iio/pressure/dps310.c | 1 -
> drivers/iio/pressure/hid-sensor-press.c | 1 -
> drivers/iio/pressure/hp03.c | 1 -
> drivers/iio/pressure/hp206c.c | 1 -
> drivers/iio/pressure/icp10100.c | 1 -
> drivers/iio/pressure/mpl115.c | 1 -
> drivers/iio/pressure/mpl3115.c | 1 -
> drivers/iio/pressure/ms5611_core.c | 1 -
> drivers/iio/pressure/ms5637.c | 1 -
> drivers/iio/pressure/st_pressure_core.c | 1 -
> drivers/iio/pressure/t5403.c | 1 -
> drivers/iio/pressure/zpa2326.c | 1 -
> drivers/iio/proximity/as3935.c | 1 -
> drivers/iio/proximity/isl29501.c | 1 -
> drivers/iio/proximity/mb1232.c | 1 -
> drivers/iio/proximity/ping.c | 1 -
> drivers/iio/proximity/pulsedlight-lidar-lite-v2.c | 1 -
> drivers/iio/proximity/rfd77402.c | 1 -
> drivers/iio/proximity/srf04.c | 1 -
> drivers/iio/proximity/srf08.c | 1 -
> drivers/iio/proximity/sx9310.c | 1 -
> drivers/iio/proximity/sx9500.c | 1 -
> drivers/iio/proximity/vcnl3020.c | 1 -
> drivers/iio/proximity/vl53l0x-i2c.c | 1 -
> drivers/iio/resolver/ad2s1200.c | 1 -
> drivers/iio/resolver/ad2s90.c | 1 -
> drivers/iio/temperature/hid-sensor-temperature.c | 1 -
> drivers/iio/temperature/iqs620at-temp.c | 1 -
> drivers/iio/temperature/ltc2983.c | 1 -
> drivers/iio/temperature/max31856.c | 1 -
> drivers/iio/temperature/maxim_thermocouple.c | 1 -
> drivers/iio/temperature/mlx90614.c | 1 -
> drivers/iio/temperature/mlx90632.c | 1 -
> drivers/iio/temperature/tmp006.c | 1 -
> drivers/iio/temperature/tmp007.c | 1 -
> drivers/iio/temperature/tsys01.c | 1 -
> drivers/iio/temperature/tsys02d.c | 1 -
> drivers/input/touchscreen/tsc2007_iio.c | 1 -
> drivers/platform/x86/toshiba_acpi.c | 1 -
> drivers/staging/iio/accel/adis16203.c | 1 -
> drivers/staging/iio/accel/adis16240.c | 1 -
> drivers/staging/iio/adc/ad7280a.c | 1 -
> drivers/staging/iio/adc/ad7816.c | 1 -
> drivers/staging/iio/addac/adt7316.c | 1 -
> drivers/staging/iio/cdc/ad7150.c | 2 --
> drivers/staging/iio/cdc/ad7746.c | 1 -
> drivers/staging/iio/frequency/ad9832.c | 1 -
> drivers/staging/iio/frequency/ad9834.c | 1 -
> drivers/staging/iio/meter/ade7854.c | 1 -
> drivers/staging/iio/resolver/ad2s1210.c | 1 -
> 319 files changed, 1 insertion(+), 321 deletions(-)
>

Next message: Hans de Goede: "Re: [PATCH] ACPI: scan: Add PNP0D80 to the _DEP exceptions list"
Previous message: Jonathan Cameron: "Re: [PATCH v2 2/2] iio: dac: ad5766: add driver support for AD5766"
In reply to: Alexandru Ardelean: "[RFC PATCH 2/5] iio,counter: remove modes init for INDIO_DIRECT_MODE only drivers"
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