On Sun, 7 Mar 2021 00:20:04 +0100 Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: > Before trying the custom method of reading the sensor > as raw and then converting, we want to use > iio_read_channel_processed() which first tries to > see if the ADC can provide a processed value directly, > else reads raw and applies scaling inside of IIO > using the scale attributes of the ADC. We need to > multiply the scaled value with 1000 to get to > microvolts from millivolts which is what processed > IIO channels returns. > > Since the old iio_read_channel_processed() would > lose precision if we fall back to reading raw and > scaling, we introduce a new API that will pass in > the scale factor, iio_read_channel_processed_scale(), > as part of this patch. > > Keep the code that assumes 12bit ADC around as a > fallback. > > This gives correct readings on the AB8500 thermistor > inputs used in the Ux500 HREFP520 platform for reading > battery and board temperature. > > Cc: Peter Rosin <peda@xxxxxxxxxx> > Cc: Chris Lesiak <chris.lesiak@xxxxxxxxx> > Cc: Jonathan Cameron <jic23@xxxxxxxxx> > Cc: linux-iio@xxxxxxxxxxxxxxx > Link: https://lore.kernel.org/linux-iio/20201224011607.1059534-1-linus.walleij@xxxxxxxxxx/ > Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> One trivial inline, but basic approach looks good to me. As Guenter suggested, should be broken up into several patches. If nothing else it'll make backports easier for anyone who wants this functionality for a different driver / usecase. Thanks, Jonathan > --- > ChangeLog v2->v3: > - After discussion about v2 we concludes that > iio_read_channel_processed() could loose precision > so we introduce a new API to read processed and > scale. > - Include a link to the v2 discussion for reference. > - For ease of applying to the hwmon tree, keep it all > in one patch. > - This needs Jonathans ACK to be merged through hwmon. > ChangeLog v1->v2: > - Fix the patch to multiply the processed value by > 1000 to get to microvolts from millivolts. > - Fix up the confusion in the commit message. > - Drop pointless comments about the code, we keep the > original code path around if processed reads don't > work, nothing bad with that. > --- > drivers/hwmon/ntc_thermistor.c | 27 ++++++++++++++++++--------- > drivers/iio/inkern.c | 15 +++++++++++++-- > include/linux/iio/consumer.h | 15 +++++++++++++++ > 3 files changed, 46 insertions(+), 11 deletions(-) > > diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c > index 3aad62a0e661..8587189c7f15 100644 > --- a/drivers/hwmon/ntc_thermistor.c > +++ b/drivers/hwmon/ntc_thermistor.c > @@ -326,18 +326,27 @@ struct ntc_data { > static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata) > { > struct iio_channel *channel = pdata->chan; > - int raw, uv, ret; > + int uv, ret; > > - ret = iio_read_channel_raw(channel, &raw); > + ret = iio_read_channel_processed_scale(channel, &uv, 1000); > if (ret < 0) { > - pr_err("read channel() error: %d\n", ret); > - return ret; > - } > + int raw; > > - ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000); > - if (ret < 0) { > - /* Assume 12 bit ADC with vref at pullup_uv */ > - uv = (pdata->pullup_uv * (s64)raw) >> 12; > + /* > + * This fallback uses a raw read and then > + * assumes the ADC is 12 bits, scaling with > + * a factor 1000 to get to microvolts. > + */ > + ret = iio_read_channel_raw(channel, &raw); > + if (ret < 0) { > + pr_err("read channel() error: %d\n", ret); > + return ret; > + } > + ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000); > + if (ret < 0) { > + /* Assume 12 bit ADC with vref at pullup_uv */ > + uv = (pdata->pullup_uv * (s64)raw) >> 12; > + } > } > > return uv; > diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c > index db77a2d4a56b..6a842c6b6705 100644 > --- a/drivers/iio/inkern.c > +++ b/drivers/iio/inkern.c > @@ -688,7 +688,8 @@ int iio_read_channel_offset(struct iio_channel *chan, int *val, int *val2) > } > EXPORT_SYMBOL_GPL(iio_read_channel_offset); > > -int iio_read_channel_processed(struct iio_channel *chan, int *val) > +int iio_read_channel_processed_scale(struct iio_channel *chan, int *val, > + unsigned int scale) > { > int ret; > > @@ -701,11 +702,14 @@ int iio_read_channel_processed(struct iio_channel *chan, int *val) > if (iio_channel_has_info(chan->channel, IIO_CHAN_INFO_PROCESSED)) { > ret = iio_channel_read(chan, val, NULL, > IIO_CHAN_INFO_PROCESSED); > + if (!ret) > + *val *= scale; To keep it inline with other code around here I'd prefer. if (ret) got err_unlock; *val *= scale; > } else { > ret = iio_channel_read(chan, val, NULL, IIO_CHAN_INFO_RAW); > if (ret < 0) > goto err_unlock; > - ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, 1); > + ret = iio_convert_raw_to_processed_unlocked(chan, *val, val, > + scale); > } > > err_unlock: > @@ -713,6 +717,13 @@ int iio_read_channel_processed(struct iio_channel *chan, int *val) > > return ret; > } > +EXPORT_SYMBOL_GPL(iio_read_channel_processed_scale); > + > +int iio_read_channel_processed(struct iio_channel *chan, int *val) > +{ > + /* This is just a special case with scale factor 1 */ > + return iio_read_channel_processed_scale(chan, val, 1); > +} > EXPORT_SYMBOL_GPL(iio_read_channel_processed); > > int iio_read_channel_scale(struct iio_channel *chan, int *val, int *val2) > diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h > index 0a90ba8fa1bb..5fa5957586cf 100644 > --- a/include/linux/iio/consumer.h > +++ b/include/linux/iio/consumer.h > @@ -241,6 +241,21 @@ int iio_read_channel_average_raw(struct iio_channel *chan, int *val); > */ > int iio_read_channel_processed(struct iio_channel *chan, int *val); > > +/** > + * iio_read_channel_processed_scale() - read and scale a processed value > + * @chan: The channel being queried. > + * @val: Value read back. > + * @scale: Scale factor to apply during the conversion > + * > + * Returns an error code or 0. > + * > + * This function will read a processed value from a channel. This will work > + * like @iio_read_channel_processed() but also scale with an additional > + * scale factor while attempting to minimize any precision loss. > + */ > +int iio_read_channel_processed_scale(struct iio_channel *chan, int *val, > + unsigned int scale); > + > /** > * iio_write_channel_attribute() - Write values to the device attribute. > * @chan: The channel being queried.
