On Wed, 20 Sep 2023 03:33:42 +0300 alisadariana@xxxxxxxxx wrote: > From: Alisa-Dariana Roman <alisadariana@xxxxxxxxx> > > Add fast settling mode support for AD7193. > > Add fast_settling_average_factor attribute. Expose to user the current > value of the fast settling average factor. User can change the value by > writing a new one. > > Add fast_settling_average_factor_available attribute. Expose to user > possible values for the fast settling average factor. > > Signed-off-by: Alisa-Dariana Roman <alisa.roman@xxxxxxxxxx> > --- > .../ABI/testing/sysfs-bus-iio-adc-ad7192 | 18 +++ > drivers/iio/adc/ad7192.c | 128 ++++++++++++++++-- > 2 files changed, 134 insertions(+), 12 deletions(-) > > diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-ad7192 b/Documentation/ABI/testing/sysfs-bus-iio-adc-ad7192 > index f8315202c8f0..5790adbb1cc1 100644 > --- a/Documentation/ABI/testing/sysfs-bus-iio-adc-ad7192 > +++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-ad7192 > @@ -19,6 +19,24 @@ Description: > the bridge can be disconnected (when it is not being used > using the bridge_switch_en attribute. > > +What: /sys/bus/iio/devices/iio:deviceX/fast_settling_average_factor > +KernelVersion: > +Contact: linux-iio@xxxxxxxxxxxxxxx > +Description: > + This attribute, if available, is used to activate or deactivate > + fast settling mode and set the value of the average factor to > + 1, 2, 8 or 16. If the average factor is set to 1, the fast > + settling mode is disabled. The data from the sinc filter is > + averaged by chosen value. The averaging reduces the output data > + rate for a given FS word, however, the rms noise improves. Trivial but RMS as it's an acronym. > + > +What: /sys/bus/iio/devices/iio:deviceX/fast_settling_average_factor_available > +KernelVersion: > +Contact: linux-iio@xxxxxxxxxxxxxxx > +Description: > + Reading returns a list with the possible values for the fast > + settling average factor: 1, 2, 8, 16. > + > What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration > KernelVersion: > Contact: linux-iio@xxxxxxxxxxxxxxx > diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c > index eed3de02c26d..8987b78865f3 100644 > --- a/drivers/iio/adc/ad7192.c > +++ b/drivers/iio/adc/ad7192.c > @@ -60,6 +60,8 @@ > #define AD7192_MODE_SEL_MASK GENMASK(23, 21) /* Operation Mode Select Mask */ > #define AD7192_MODE_STA_MASK BIT(20) /* Status Register transmission Mask */ > #define AD7192_MODE_CLKSRC_MASK GENMASK(19, 18) /* Clock Source Select Mask */ > +#define AD7192_MODE_AVG_MASK GENMASK(17, 16) > + /* Fast Settling Filter Average Select Mask (AD7193 only) */ > #define AD7192_MODE_SINC3 BIT(15) /* SINC3 Filter Select */ > #define AD7192_MODE_ENPAR BIT(13) /* Parity Enable */ > #define AD7192_MODE_CLKDIV BIT(12) /* Clock divide by 2 (AD7190/2 only)*/ > @@ -182,6 +184,7 @@ struct ad7192_state { > u32 mode; > u32 conf; > u32 scale_avail[8][2]; > + u8 avg_avail[4]; > u8 gpocon; > u8 clock_sel; > struct mutex lock; /* protect sensor state */ > @@ -459,6 +462,13 @@ static int ad7192_setup(struct iio_dev *indio_dev, struct device_node *np) > st->scale_avail[i][0] = scale_uv; > } > > + if (st->chip_info->chip_id == CHIPID_AD7193) { Hmm. This does match with local style, but I'd have preferred if the driver put all this information in the chip_info structure rather than scattered in code thoughout the driver. That would be a bigger and mostly unrelated cleanup however and this doesn't make the situation any worse really so I'm fine with this patch as it stands. Jonathan > + st->avg_avail[0] = 1; > + st->avg_avail[1] = 2; > + st->avg_avail[2] = 8; > + st->avg_avail[3] = 16; > + } > + > return 0; > } >