Commit 63c3ecd9 authored Apr 04, 2017 by Linus Walleij Committed by Jonathan Cameron Apr 08, 2017

iio: adc: add a driver for Qualcomm PM8xxx HK/XOADC



The Qualcomm PM8xxx PMICs contain a simpler ADC than its
successors (already in the kernel as qcom-spmi-vadc.c):
the HK/XO ADC (Housekeeping/Chrystal oscillator ADC).

As far as I can understand this is equal to the PMICs
using SSBI transport and encompass PM8018, PM8038,
PM8058, and PM8921, so this is shortly named PM8xxx.

This ADC monitors a bunch of on-board voltages and the die
temperature of the PMIC itself, but it can also be routed
to convert a few external MPPs (multi-purpose pins). On
the APQ8060 DragonBoard this feature is used to let this
ADC convert an analog ALS (Ambient Light Sensor) voltage
signal from a Capella CM3605 ALS into a LUX value.

Developed and tested with APQ8060 DragonBoard based on
Ivan's driver and Rama Krishna's patches. The SPMI VADC
driver is quite different, but share enough minor
functionality that I have split out to the common file
in a previous patch.

Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-arm-msm@vger.kernel.org
Cc: Ivan T. Ivanov <iivanov.xz@gmail.com>
Cc: Andy Gross <andy.gross@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Rama Krishna Phani A <rphani@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

parent e932d4f0

drivers/iio/adc/Kconfig

+11 −0

Original line number	Diff line number	Diff line
		@@ -499,6 +499,17 @@ config PALMAS_GPADC
		config QCOM_VADC_COMMON
		tristate

		config QCOM_PM8XXX_XOADC
		tristate "Qualcomm SSBI PM8xxx PMIC XOADCs"
		depends on MFD_PM8XXX
		select QCOM_VADC_COMMON
		help
		ADC driver for the XOADC portions of the Qualcomm PM8xxx PMICs
		using SSBI transport: PM8018, PM8038, PM8058, PM8921.

		To compile this driver as a module, choose M here: the module
		will be called qcom-pm8xxx-xoadc.

		config QCOM_SPMI_IADC
		tristate "Qualcomm SPMI PMIC current ADC"
		depends on SPMI

drivers/iio/adc/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -50,6 +50,7 @@ obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
		obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
		obj-$(CONFIG_QCOM_VADC_COMMON) += qcom-vadc-common.o
		obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o
		obj-$(CONFIG_QCOM_PM8XXX_XOADC) += qcom-pm8xxx-xoadc.o
		obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o
		obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
		obj-$(CONFIG_SPEAR_ADC) += spear_adc.o

drivers/iio/adc/qcom-pm8xxx-xoadc.c

0 → 100644

+1036 −0

File added.

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