linux-kernel - [PATCH 0/2] iio: adc: Add a current from voltage driver

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Message-ID: <BN6PR04MB066014AF936EF8ADCBF011A1A3BA0@BN6PR04MB0660.namprd04.prod.outlook.com>
Date:   Fri, 15 May 2020 19:26:17 -0700
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, robh+dt@...nel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:     linus.walleij@...aro.org, Jonathan Bakker <xc-racer2@...e.ca>
Subject: [PATCH 0/2] iio: adc: Add a current from voltage driver

In the discussion around adding the GP2A002 light driver, there came
up the question of what to do when a system emulates a current ADC
by using a voltage ADC and a resistor.  Rather than adding it on
a per-driver basis, it was suggested(1) to add a minimal IIO driver
to support this situation.

The new driver is fairly simple - it simply takes a voltage ADC and
a resistor value in ohms exposed as the scale and outputs a current.

It has been tested on a first-gen Galaxy S device which has the above
mentioned GP2A002 chip connected to the voltage ADC resistor complex.

1) https://lore.kernel.org/linux-iio/20200202150843.762c6897@archlinux/

Jonathan Bakker (2):
  dt-bindings: iio: adc: Add binding for current-from-voltage
  iio: adc: Add current-from-voltage driver

 .../iio/adc/linux,current-from-voltage.yaml   |  47 +++++++
 MAINTAINERS                                   |   8 ++
 drivers/iio/adc/Kconfig                       |   9 ++
 drivers/iio/adc/Makefile                      |   1 +
 drivers/iio/adc/current-from-voltage.c        | 123 ++++++++++++++++++
 5 files changed, 188 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iio/adc/linux,current-from-voltage.yaml
 create mode 100644 drivers/iio/adc/current-from-voltage.c

-- 
2.20.1