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Fri, 8 May 2020 21:14:51 +0000 From: Jonathan Bakker To: jic23@kernel.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, kgene@kernel.org, krzk@kernel.org Cc: cw00.choi@samsung.com, kstewart@linuxfoundation.org, mpe@ellerman.id.au, m.szyprowski@samsung.com, swboyd@chromium.org, tglx@linutronix.de, linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Bakker Subject: [PATCH] iio: adc: Add scaling support to exynos adc driver Date: Fri, 8 May 2020 14:14:00 -0700 Message-ID: X-Mailer: git-send-email 2.20.1 X-ClientProxiedBy: MWHPR11CA0007.namprd11.prod.outlook.com (2603:10b6:301:1::17) To BN6PR04MB0660.namprd04.prod.outlook.com (2603:10b6:404:d9::21) X-Microsoft-Original-Message-ID: <20200508211400.13529-1-xc-racer2@live.ca> MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from jon-hp-6570b.telus (2001:569:fb68:9c00:8067:f823:1e15:7520) by MWHPR11CA0007.namprd11.prod.outlook.com (2603:10b6:301:1::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2979.26 via Frontend Transport; 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As we have the regulator voltage and the maximum value (stored in the data mask), we can trivially produce a scaling fraction of voltage / max value. This assumes that the regulator voltage is in fact the max voltage, which appears to be the case for all mainline dts and cross referenced with the public Exynos4412 and S5PV210 datasheets. Signed-off-by: Jonathan Bakker Reviewed-by: Krzysztof Kozlowski --- drivers/iio/adc/exynos_adc.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c index 22131a677445..9d29b56805cd 100644 --- a/drivers/iio/adc/exynos_adc.c +++ b/drivers/iio/adc/exynos_adc.c @@ -531,8 +531,19 @@ static int exynos_read_raw(struct iio_dev *indio_dev, unsigned long timeout; int ret; - if (mask != IIO_CHAN_INFO_RAW) + if (mask == IIO_CHAN_INFO_SCALE) { + ret = regulator_get_voltage(info->vdd); + if (ret < 0) + return ret; + + /* Regulator voltage is in uV, but need mV */ + *val = ret / 1000; + *val2 = info->data->mask; + + return IIO_VAL_FRACTIONAL; + } else if (mask != IIO_CHAN_INFO_RAW) { return -EINVAL; + } mutex_lock(&indio_dev->mlock); reinit_completion(&info->completion); @@ -683,6 +694,7 @@ static const struct iio_info exynos_adc_iio_info = { .channel = _index, \ .address = _index, \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SCALE), \ .datasheet_name = _id, \ }