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iio: adc: Support ROHM BD79124 ADC

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The ROHM BD79124 is a 12-bit, 8-channel, SAR ADC. The ADC supports
an automatic measurement mode, with an alarm interrupt for out-of-window
measurements. The window is configurable for each channel.

The I2C protocol for manual start of the measurement and data reading is
somewhat peculiar. It requires the master to do clock stretching after
sending the I2C slave-address until the slave has captured the data.
Needless to say this is not well suopported by the I2C controllers.

Thus do not support the BD79124's manual measurement mode but implement
the measurements using automatic measurement mode, relying on the
BD79124's ability of storing latest measurements into register.

Support also configuring the threshold events for detecting the
out-of-window events.

The BD79124 keeps asserting IRQ for as long as the measured voltage is
out of the configured window. Thus, prevent the user-space from choking
on the events and mask the received event for a fixed duration (1 second)
when an event is handled.

The ADC input pins can be also configured as general purpose outputs.
Make those pins which don't have corresponding ADC channel node in the
device-tree controllable as GPO.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://patch.msgid.link/ca3886c9abcb268ca976e62cd7da28bf5d6e6382.1742560649.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Matti Vaittinen 2025-03-24 09:13:42 +02:00 committed by Jonathan Cameron
parent 19d8a86918
commit 3f57a3b9ab
3 changed files with 1160 additions and 0 deletions
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12
drivers/iio/adc/Kconfig
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@ -1235,6 +1235,18 @@ config RN5T618_ADC
This driver can also be built as a module. If so, the module
will be called rn5t618-adc.
config ROHM_BD79124
tristate "Rohm BD79124 ADC driver"
depends on I2C
select REGMAP_I2C
select IIO_ADC_HELPER
help
Say yes here to build support for the ROHM BD79124 ADC. The
ROHM BD79124 is a 12-bit, 8-channel, SAR ADC. The ADC supports
also an automatic measurement mode, with an alarm interrupt for
out-of-window measurements. The window is configurable for each
channel.
config ROCKCHIP_SARADC
tristate "Rockchip SARADC driver"
depends on ARCH_ROCKCHIP || COMPILE_TEST

1
drivers/iio/adc/Makefile
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@ -112,6 +112,7 @@ obj-$(CONFIG_QCOM_VADC_COMMON) += qcom-vadc-common.o
obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o
obj-$(CONFIG_RICHTEK_RTQ6056) += rtq6056.o
obj-$(CONFIG_RN5T618_ADC) += rn5t618-adc.o
obj-$(CONFIG_ROHM_BD79124) += rohm-bd79124.o
obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
obj-$(CONFIG_RZG2L_ADC) += rzg2l_adc.o
obj-$(CONFIG_SC27XX_ADC) += sc27xx_adc.o

1147
drivers/iio/adc/rohm-bd79124.c Normal file
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