Hi, On Thu, Apr 28, 2022 at 09:09:03PM +0000, Ruslan Zalata wrote: > Some Allwinner SoCs like A13, A20 or T2 are equipped with two-channel > low rate (6 bit) ADC that is often used for extra keys. There's a driver > for that already implementing standard input device, but it has these > limitations: 1) it cannot be used for general ADC data equisition, and > 2) it uses only one LRADC channel of two available. > > This driver provides basic hwmon interface to both channels of LRADC on > such Allwinner SoCs. > > Signed-off-by: Ruslan Zalata <rz@xxxxxxxxxxx> > --- > MAINTAINERS | 6 + > drivers/hwmon/Kconfig | 13 ++ > drivers/hwmon/Makefile | 1 + > drivers/hwmon/sun4i-lradc-hwmon.c | 280 ++++++++++++++++++++++++++++++ > 4 files changed, 300 insertions(+) > create mode 100644 drivers/hwmon/sun4i-lradc-hwmon.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 5e8c2f61176..d9c71e94133 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -18861,6 +18861,12 @@ S: Maintained > F: Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml > F: drivers/input/keyboard/sun4i-lradc-keys.c > > +SUN4I LOW RES ADC HWMON DRIVER > +M: Ruslan Zalata <rz@xxxxxxxxxxx> > +L: linux-hwmon@xxxxxxxxxxxxxxx > +S: Maintained > +F: drivers/hwmon/sun4i-lradc-hwmon.c > + > SUNDANCE NETWORK DRIVER > M: Denis Kirjanov <kda@xxxxxxxxxxxxxxxxx> > L: netdev@xxxxxxxxxxxxxxx > diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig > index 68a8a27ab3b..86776488a81 100644 > --- a/drivers/hwmon/Kconfig > +++ b/drivers/hwmon/Kconfig > @@ -1691,6 +1691,19 @@ config SENSORS_SIS5595 > This driver can also be built as a module. If so, the module > will be called sis5595. > > +config SENSORS_SUN4I_LRADC > + tristate "Allwinner A13/A20 LRADC hwmon" > + depends on ARCH_SUNXI && !KEYBOARD_SUN4I_LRADC > + help > + Say y here to support the LRADC found in Allwinner A13/A20 SoCs. > + Both channels are supported. > + > + This driver can also be built as module. If so, the module > + will be called sun4i-lradc-hwmon. > + > + This option is not compatible with KEYBOARD_SUN4I_LRADC, one > + of these must be used at a time. How do you plan on enforcing that? I guess a better path forward would be to either register an hwmon device in the original driver, or convert that driver to iio and use iio-hwmon. Maxime
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