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[92.34.215.146]) by smtp.gmail.com with ESMTPSA id g22sm1813178lfh.31.2020.11.01.15.22.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 01 Nov 2020 15:22:15 -0800 (PST) From: Linus Walleij To: Jonathan Cameron , linux-iio@vger.kernel.org Cc: Hartmut Knaack , Lars-Peter Clausen , Peter Meerwald-Stadler , Linus Walleij , Peter Rosin Subject: [PATCH] iio: afe: iio-rescale: Support processed channels Date: Mon, 2 Nov 2020 00:22:11 +0100 Message-Id: <20201101232211.1194304-1-linus.walleij@linaro.org> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org It happens that an ADC will only provide raw or processed voltage conversion channels. (adc/ab8500-gpadc.c). On the Samsung GT-I9070 this is used for a light sensor and current sense amplifier so we need to think of something. The idea is to allow processed channels and scale them with 1/1 and then the rescaler can modify the result on top. Cc: Peter Rosin Signed-off-by: Linus Walleij --- drivers/iio/afe/iio-rescale.c | 31 +++++++++++++++++++++++++++---- 1 file changed, 27 insertions(+), 4 deletions(-) diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c index e42ea2b1707d..ea90034cb257 100644 --- a/drivers/iio/afe/iio-rescale.c +++ b/drivers/iio/afe/iio-rescale.c @@ -29,6 +29,7 @@ struct rescale { struct iio_channel *source; struct iio_chan_spec chan; struct iio_chan_spec_ext_info *ext_info; + bool chan_processed; s32 numerator; s32 denominator; }; @@ -43,10 +44,27 @@ static int rescale_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: - return iio_read_channel_raw(rescale->source, val); + if (rescale->chan_processed) + /* + * When only processed channels are supported, we + * read the processed data and scale it by 1/1 + * augmented with whatever the rescaler has calculated. + */ + return iio_read_channel_processed(rescale->source, val); + else + return iio_read_channel_raw(rescale->source, val); case IIO_CHAN_INFO_SCALE: - ret = iio_read_channel_scale(rescale->source, val, val2); + if (rescale->chan_processed) { + /* + * Processed channels are scaled 1-to-1 + */ + ret = IIO_VAL_FRACTIONAL; + *val = 1; + *val2 = 1; + } else { + ret = iio_read_channel_scale(rescale->source, val, val2); + } switch (ret) { case IIO_VAL_FRACTIONAL: *val *= rescale->numerator; @@ -132,8 +150,13 @@ static int rescale_configure_channel(struct device *dev, if (!iio_channel_has_info(schan, IIO_CHAN_INFO_RAW) || !iio_channel_has_info(schan, IIO_CHAN_INFO_SCALE)) { - dev_err(dev, "source channel does not support raw/scale\n"); - return -EINVAL; + if (iio_channel_has_info(schan, IIO_CHAN_INFO_PROCESSED)) { + dev_info(dev, "using processed channel\n"); + rescale->chan_processed = true; + } else { + dev_err(dev, "source channel does not support raw+scale or processed data\n"); + return -EINVAL; + } } chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | -- 2.26.2