iio: dac: Add support for the AD5592R/AD5593R ADCs/DACs
This patch adds support for the AD5592R (spi) and AD5593R (i2c) ADC/DAC/GPIO devices. Signed-off-by: Paul Cercueil <paul.cercueil@analog.com> Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>hifive-unleashed-5.1
Paul Cercueil
Jonathan Cameron
parent
5ea9274b86
commit
56ca9db862
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@ -0,0 +1,155 @@
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Analog Devices AD5592R/AD5593R DAC/ADC device driver
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Required properties for the AD5592R:
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- compatible: Must be "adi,ad5592r"
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- reg: SPI chip select number for the device
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- spi-max-frequency: Max SPI frequency to use (< 30000000)
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- spi-cpol: The AD5592R requires inverse clock polarity (CPOL) mode
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Required properties for the AD5593R:
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- compatible: Must be "adi,ad5593r"
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- reg: I2C address of the device
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Required properties for all supported chips:
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- #address-cells: Should be 1.
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- #size-cells: Should be 0.
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- channel nodes:
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Each child node represents one channel and has the following
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Required properties:
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* reg: Pin on which this channel is connected to.
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* adi,mode: Mode or function of this channel.
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Macros specifying the valid values
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can be found in <dt-bindings/iio/adi,ad5592r.h>.
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The following values are currently supported:
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* CH_MODE_UNUSED (the pin is unused)
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* CH_MODE_ADC (the pin is ADC input)
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* CH_MODE_DAC (the pin is DAC output)
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* CH_MODE_DAC_AND_ADC (the pin is DAC output
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but can be monitored by an ADC, since
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there is no disadvantage this
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this should be considered as the
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preferred DAC mode)
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* CH_MODE_GPIO (the pin is registered
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with GPIOLIB)
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Optional properties:
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* adi,off-state: State of this channel when unused or the
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device gets removed. Macros specifying the
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valid values can be found in
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<dt-bindings/iio/adi,ad5592r.h>.
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* CH_OFFSTATE_PULLDOWN (the pin is pulled down)
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* CH_OFFSTATE_OUT_LOW (the pin is output low)
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* CH_OFFSTATE_OUT_HIGH (the pin is output high)
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* CH_OFFSTATE_OUT_TRISTATE (the pin is
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tristated output)
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Optional properties:
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- vref-supply: Phandle to the external reference voltage supply. This should
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only be set if there is an external reference voltage connected to the VREF
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pin. If the property is not set the internal 2.5V reference is used.
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- reset-gpios : GPIO spec for the RESET pin. If specified, it will be
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asserted during driver probe.
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- gpio-controller: Marks the device node as a GPIO controller.
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- #gpio-cells: Should be 2. The first cell is the GPIO number and the second
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cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>.
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AD5592R Example:
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#include <dt-bindings/iio/adi,ad5592r.h>
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vref: regulator-vref {
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compatible = "regulator-fixed";
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regulator-name = "vref-ad559x";
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regulator-min-microvolt = <3300000>;
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regulator-max-microvolt = <3300000>;
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regulator-always-on;
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};
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ad5592r@0 {
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#size-cells = <0>;
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#address-cells = <1>;
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#gpio-cells = <2>;
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compatible = "adi,ad5592r";
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reg = <0>;
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spi-max-frequency = <1000000>;
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spi-cpol;
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vref-supply = <&vref>; /* optional */
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reset-gpios = <&gpio0 86 0>; /* optional */
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gpio-controller;
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channel@0 {
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reg = <0>;
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adi,mode = <CH_MODE_DAC>;
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};
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channel@1 {
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reg = <1>;
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adi,mode = <CH_MODE_ADC>;
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};
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channel@2 {
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reg = <2>;
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adi,mode = <CH_MODE_DAC_AND_ADC>;
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};
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channel@3 {
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reg = <3>;
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adi,mode = <CH_MODE_DAC_AND_ADC>;
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adi,off-state = <CH_OFFSTATE_PULLDOWN>;
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};
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channel@4 {
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reg = <4>;
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adi,mode = <CH_MODE_UNUSED>;
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adi,off-state = <CH_OFFSTATE_PULLDOWN>;
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};
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channel@5 {
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reg = <5>;
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adi,mode = <CH_MODE_GPIO>;
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adi,off-state = <CH_OFFSTATE_PULLDOWN>;
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};
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channel@6 {
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reg = <6>;
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adi,mode = <CH_MODE_GPIO>;
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adi,off-state = <CH_OFFSTATE_PULLDOWN>;
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};
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channel@7 {
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reg = <7>;
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adi,mode = <CH_MODE_GPIO>;
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adi,off-state = <CH_OFFSTATE_PULLDOWN>;
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};
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};
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AD5593R Example:
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#include <dt-bindings/iio/adi,ad5592r.h>
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ad5593r@10 {
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#size-cells = <0>;
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#address-cells = <1>;
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#gpio-cells = <2>;
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compatible = "adi,ad5593r";
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reg = <0x10>;
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gpio-controller;
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channel@0 {
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reg = <0>;
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adi,mode = <CH_MODE_DAC>;
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adi,off-state = <CH_OFFSTATE_PULLDOWN>;
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};
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channel@1 {
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reg = <1>;
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adi,mode = <CH_MODE_ADC>;
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adi,off-state = <CH_OFFSTATE_PULLDOWN>;
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};
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channel@2 {
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reg = <2>;
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adi,mode = <CH_MODE_DAC_AND_ADC>;
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adi,off-state = <CH_OFFSTATE_PULLDOWN>;
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};
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channel@6 {
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reg = <6>;
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adi,mode = <CH_MODE_GPIO>;
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adi,off-state = <CH_OFFSTATE_PULLDOWN>;
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};
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};
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@ -74,6 +74,33 @@ config AD5449
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To compile this driver as a module, choose M here: the
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module will be called ad5449.
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config AD5592R_BASE
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tristate
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config AD5592R
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tristate "Analog Devices AD5592R ADC/DAC driver"
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depends on SPI_MASTER
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select GPIOLIB
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select AD5592R_BASE
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help
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Say yes here to build support for Analog Devices AD5592R
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Digital to Analog / Analog to Digital Converter.
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To compile this driver as a module, choose M here: the
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module will be called ad5592r.
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config AD5593R
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tristate "Analog Devices AD5593R ADC/DAC driver"
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depends on I2C
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select GPIOLIB
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select AD5592R_BASE
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help
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Say yes here to build support for Analog Devices AD5593R
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Digital to Analog / Analog to Digital Converter.
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To compile this driver as a module, choose M here: the
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module will be called ad5593r.
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config AD5504
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tristate "Analog Devices AD5504/AD5501 DAC SPI driver"
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depends on SPI
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@ -11,6 +11,9 @@ obj-$(CONFIG_AD5064) += ad5064.o
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obj-$(CONFIG_AD5504) += ad5504.o
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obj-$(CONFIG_AD5446) += ad5446.o
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obj-$(CONFIG_AD5449) += ad5449.o
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obj-$(CONFIG_AD5592R_BASE) += ad5592r-base.o
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obj-$(CONFIG_AD5592R) += ad5592r.o
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obj-$(CONFIG_AD5593R) += ad5593r.o
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obj-$(CONFIG_AD5755) += ad5755.o
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obj-$(CONFIG_AD5761) += ad5761.o
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obj-$(CONFIG_AD5764) += ad5764.o
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@ -0,0 +1,691 @@
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/*
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* AD5592R Digital <-> Analog converters driver
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*
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* Copyright 2014-2016 Analog Devices Inc.
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* Author: Paul Cercueil <paul.cercueil@analog.com>
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/iio/iio.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/driver.h>
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#include <linux/gpio.h>
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#include <linux/property.h>
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#include <dt-bindings/iio/adi,ad5592r.h>
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#include "ad5592r-base.h"
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static int ad5592r_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct ad5592r_state *st = gpiochip_get_data(chip);
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int ret = 0;
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u8 val;
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mutex_lock(&st->gpio_lock);
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if (st->gpio_out & BIT(offset))
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val = st->gpio_val;
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else
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ret = st->ops->gpio_read(st, &val);
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mutex_unlock(&st->gpio_lock);
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if (ret < 0)
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return ret;
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return !!(val & BIT(offset));
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}
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static void ad5592r_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
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{
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struct ad5592r_state *st = gpiochip_get_data(chip);
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mutex_lock(&st->gpio_lock);
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if (value)
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st->gpio_val |= BIT(offset);
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else
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st->gpio_val &= ~BIT(offset);
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st->ops->reg_write(st, AD5592R_REG_GPIO_SET, st->gpio_val);
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mutex_unlock(&st->gpio_lock);
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}
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static int ad5592r_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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struct ad5592r_state *st = gpiochip_get_data(chip);
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int ret;
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mutex_lock(&st->gpio_lock);
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st->gpio_out &= ~BIT(offset);
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st->gpio_in |= BIT(offset);
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ret = st->ops->reg_write(st, AD5592R_REG_GPIO_OUT_EN, st->gpio_out);
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if (ret < 0)
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goto err_unlock;
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ret = st->ops->reg_write(st, AD5592R_REG_GPIO_IN_EN, st->gpio_in);
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err_unlock:
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mutex_unlock(&st->gpio_lock);
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return ret;
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}
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static int ad5592r_gpio_direction_output(struct gpio_chip *chip,
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unsigned offset, int value)
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{
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struct ad5592r_state *st = gpiochip_get_data(chip);
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int ret;
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mutex_lock(&st->gpio_lock);
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if (value)
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st->gpio_val |= BIT(offset);
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else
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st->gpio_val &= ~BIT(offset);
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st->gpio_in &= ~BIT(offset);
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st->gpio_out |= BIT(offset);
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ret = st->ops->reg_write(st, AD5592R_REG_GPIO_SET, st->gpio_val);
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if (ret < 0)
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goto err_unlock;
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ret = st->ops->reg_write(st, AD5592R_REG_GPIO_OUT_EN, st->gpio_out);
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if (ret < 0)
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goto err_unlock;
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ret = st->ops->reg_write(st, AD5592R_REG_GPIO_IN_EN, st->gpio_in);
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err_unlock:
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mutex_unlock(&st->gpio_lock);
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return ret;
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}
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static int ad5592r_gpio_request(struct gpio_chip *chip, unsigned offset)
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{
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struct ad5592r_state *st = gpiochip_get_data(chip);
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if (!(st->gpio_map & BIT(offset))) {
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dev_err(st->dev, "GPIO %d is reserved by alternate function\n",
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offset);
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return -ENODEV;
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}
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return 0;
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}
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static int ad5592r_gpio_init(struct ad5592r_state *st)
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{
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if (!st->gpio_map)
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return 0;
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st->gpiochip.label = dev_name(st->dev);
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st->gpiochip.base = -1;
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st->gpiochip.ngpio = 8;
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st->gpiochip.parent = st->dev;
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st->gpiochip.can_sleep = true;
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st->gpiochip.direction_input = ad5592r_gpio_direction_input;
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st->gpiochip.direction_output = ad5592r_gpio_direction_output;
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st->gpiochip.get = ad5592r_gpio_get;
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st->gpiochip.set = ad5592r_gpio_set;
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st->gpiochip.request = ad5592r_gpio_request;
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st->gpiochip.owner = THIS_MODULE;
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mutex_init(&st->gpio_lock);
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return gpiochip_add_data(&st->gpiochip, st);
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}
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static void ad5592r_gpio_cleanup(struct ad5592r_state *st)
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{
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if (st->gpio_map)
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gpiochip_remove(&st->gpiochip);
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}
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static int ad5592r_reset(struct ad5592r_state *st)
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{
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struct gpio_desc *gpio;
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struct iio_dev *iio_dev = iio_priv_to_dev(st);
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gpio = devm_gpiod_get_optional(st->dev, "reset", GPIOD_OUT_LOW);
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if (IS_ERR(gpio))
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return PTR_ERR(gpio);
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if (gpio) {
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udelay(1);
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gpiod_set_value(gpio, 1);
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} else {
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mutex_lock(&iio_dev->mlock);
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/* Writing this magic value resets the device */
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st->ops->reg_write(st, AD5592R_REG_RESET, 0xdac);
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mutex_unlock(&iio_dev->mlock);
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}
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udelay(250);
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return 0;
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}
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static int ad5592r_get_vref(struct ad5592r_state *st)
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{
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int ret;
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if (st->reg) {
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ret = regulator_get_voltage(st->reg);
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if (ret < 0)
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return ret;
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return ret / 1000;
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} else {
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return 2500;
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}
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}
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static int ad5592r_set_channel_modes(struct ad5592r_state *st)
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{
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const struct ad5592r_rw_ops *ops = st->ops;
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int ret;
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unsigned i;
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struct iio_dev *iio_dev = iio_priv_to_dev(st);
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u8 pulldown = 0, tristate = 0, dac = 0, adc = 0;
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u16 read_back;
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for (i = 0; i < st->num_channels; i++) {
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switch (st->channel_modes[i]) {
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case CH_MODE_DAC:
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dac |= BIT(i);
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break;
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case CH_MODE_ADC:
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adc |= BIT(i);
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break;
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case CH_MODE_DAC_AND_ADC:
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dac |= BIT(i);
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adc |= BIT(i);
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break;
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case CH_MODE_GPIO:
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st->gpio_map |= BIT(i);
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st->gpio_in |= BIT(i); /* Default to input */
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break;
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case CH_MODE_UNUSED:
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/* fall-through */
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default:
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switch (st->channel_offstate[i]) {
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case CH_OFFSTATE_OUT_TRISTATE:
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tristate |= BIT(i);
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break;
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case CH_OFFSTATE_OUT_LOW:
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st->gpio_out |= BIT(i);
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break;
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case CH_OFFSTATE_OUT_HIGH:
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st->gpio_out |= BIT(i);
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st->gpio_val |= BIT(i);
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break;
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case CH_OFFSTATE_PULLDOWN:
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/* fall-through */
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default:
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pulldown |= BIT(i);
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break;
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}
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}
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}
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mutex_lock(&iio_dev->mlock);
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/* Pull down unused pins to GND */
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ret = ops->reg_write(st, AD5592R_REG_PULLDOWN, pulldown);
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if (ret)
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goto err_unlock;
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ret = ops->reg_write(st, AD5592R_REG_TRISTATE, tristate);
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if (ret)
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goto err_unlock;
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/* Configure pins that we use */
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ret = ops->reg_write(st, AD5592R_REG_DAC_EN, dac);
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if (ret)
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goto err_unlock;
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ret = ops->reg_write(st, AD5592R_REG_ADC_EN, adc);
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if (ret)
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goto err_unlock;
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ret = ops->reg_write(st, AD5592R_REG_GPIO_SET, st->gpio_val);
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if (ret)
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goto err_unlock;
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ret = ops->reg_write(st, AD5592R_REG_GPIO_OUT_EN, st->gpio_out);
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if (ret)
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goto err_unlock;
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ret = ops->reg_write(st, AD5592R_REG_GPIO_IN_EN, st->gpio_in);
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if (ret)
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goto err_unlock;
|
||||
|
||||
/* Verify that we can read back at least one register */
|
||||
ret = ops->reg_read(st, AD5592R_REG_ADC_EN, &read_back);
|
||||
if (!ret && (read_back & 0xff) != adc)
|
||||
ret = -EIO;
|
||||
|
||||
err_unlock:
|
||||
mutex_unlock(&iio_dev->mlock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad5592r_reset_channel_modes(struct ad5592r_state *st)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(st->channel_modes); i++)
|
||||
st->channel_modes[i] = CH_MODE_UNUSED;
|
||||
|
||||
return ad5592r_set_channel_modes(st);
|
||||
}
|
||||
|
||||
static int ad5592r_write_raw(struct iio_dev *iio_dev,
|
||||
struct iio_chan_spec const *chan, int val, int val2, long mask)
|
||||
{
|
||||
struct ad5592r_state *st = iio_priv(iio_dev);
|
||||
int ret;
|
||||
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
|
||||
if (val >= (1 << chan->scan_type.realbits) || val < 0)
|
||||
return -EINVAL;
|
||||
|
||||
if (!chan->output)
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&iio_dev->mlock);
|
||||
ret = st->ops->write_dac(st, chan->channel, val);
|
||||
if (!ret)
|
||||
st->cached_dac[chan->channel] = val;
|
||||
mutex_unlock(&iio_dev->mlock);
|
||||
return ret;
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
if (chan->type == IIO_VOLTAGE) {
|
||||
bool gain;
|
||||
|
||||
if (val == st->scale_avail[0][0] &&
|
||||
val2 == st->scale_avail[0][1])
|
||||
gain = false;
|
||||
else if (val == st->scale_avail[1][0] &&
|
||||
val2 == st->scale_avail[1][1])
|
||||
gain = true;
|
||||
else
|
||||
return -EINVAL;
|
||||
|
||||
mutex_lock(&iio_dev->mlock);
|
||||
|
||||
ret = st->ops->reg_read(st, AD5592R_REG_CTRL,
|
||||
&st->cached_gp_ctrl);
|
||||
if (ret < 0) {
|
||||
mutex_unlock(&iio_dev->mlock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (chan->output) {
|
||||
if (gain)
|
||||
st->cached_gp_ctrl |=
|
||||
AD5592R_REG_CTRL_DAC_RANGE;
|
||||
else
|
||||
st->cached_gp_ctrl &=
|
||||
~AD5592R_REG_CTRL_DAC_RANGE;
|
||||
} else {
|
||||
if (gain)
|
||||
st->cached_gp_ctrl |=
|
||||
AD5592R_REG_CTRL_ADC_RANGE;
|
||||
else
|
||||
st->cached_gp_ctrl &=
|
||||
~AD5592R_REG_CTRL_ADC_RANGE;
|
||||
}
|
||||
|
||||
ret = st->ops->reg_write(st, AD5592R_REG_CTRL,
|
||||
st->cached_gp_ctrl);
|
||||
mutex_unlock(&iio_dev->mlock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ad5592r_read_raw(struct iio_dev *iio_dev,
|
||||
struct iio_chan_spec const *chan,
|
||||
int *val, int *val2, long m)
|
||||
{
|
||||
struct ad5592r_state *st = iio_priv(iio_dev);
|
||||
u16 read_val;
|
||||
int ret;
|
||||
|
||||
switch (m) {
|
||||
case IIO_CHAN_INFO_RAW:
|
||||
mutex_lock(&iio_dev->mlock);
|
||||
|
||||
if (!chan->output) {
|
||||
ret = st->ops->read_adc(st, chan->channel, &read_val);
|
||||
if (ret)
|
||||
goto unlock;
|
||||
|
||||
if ((read_val >> 12 & 0x7) != (chan->channel & 0x7)) {
|
||||
dev_err(st->dev, "Error while reading channel %u\n",
|
||||
chan->channel);
|
||||
ret = -EIO;
|
||||
goto unlock;
|
||||
}
|
||||
|
||||
read_val &= GENMASK(11, 0);
|
||||
|
||||
} else {
|
||||
read_val = st->cached_dac[chan->channel];
|
||||
}
|
||||
|
||||
dev_dbg(st->dev, "Channel %u read: 0x%04hX\n",
|
||||
chan->channel, read_val);
|
||||
|
||||
*val = (int) read_val;
|
||||
ret = IIO_VAL_INT;
|
||||
break;
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
*val = ad5592r_get_vref(st);
|
||||
|
||||
if (chan->type == IIO_TEMP) {
|
||||
s64 tmp = *val * (3767897513LL / 25LL);
|
||||
*val = div_s64_rem(tmp, 1000000000LL, val2);
|
||||
|
||||
ret = IIO_VAL_INT_PLUS_MICRO;
|
||||
} else {
|
||||
int mult;
|
||||
|
||||
mutex_lock(&iio_dev->mlock);
|
||||
|
||||
if (chan->output)
|
||||
mult = !!(st->cached_gp_ctrl &
|
||||
AD5592R_REG_CTRL_DAC_RANGE);
|
||||
else
|
||||
mult = !!(st->cached_gp_ctrl &
|
||||
AD5592R_REG_CTRL_ADC_RANGE);
|
||||
|
||||
*val *= ++mult;
|
||||
|
||||
*val2 = chan->scan_type.realbits;
|
||||
ret = IIO_VAL_FRACTIONAL_LOG2;
|
||||
}
|
||||
break;
|
||||
case IIO_CHAN_INFO_OFFSET:
|
||||
ret = ad5592r_get_vref(st);
|
||||
|
||||
mutex_lock(&iio_dev->mlock);
|
||||
|
||||
if (st->cached_gp_ctrl & AD5592R_REG_CTRL_ADC_RANGE)
|
||||
*val = (-34365 * 25) / ret;
|
||||
else
|
||||
*val = (-75365 * 25) / ret;
|
||||
ret = IIO_VAL_INT;
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
}
|
||||
|
||||
unlock:
|
||||
mutex_unlock(&iio_dev->mlock);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int ad5592r_write_raw_get_fmt(struct iio_dev *indio_dev,
|
||||
struct iio_chan_spec const *chan, long mask)
|
||||
{
|
||||
switch (mask) {
|
||||
case IIO_CHAN_INFO_SCALE:
|
||||
return IIO_VAL_INT_PLUS_NANO;
|
||||
|
||||
default:
|
||||
return IIO_VAL_INT_PLUS_MICRO;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static const struct iio_info ad5592r_info = {
|
||||
.read_raw = ad5592r_read_raw,
|
||||
.write_raw = ad5592r_write_raw,
|
||||
.write_raw_get_fmt = ad5592r_write_raw_get_fmt,
|
||||
.driver_module = THIS_MODULE,
|
||||
};
|
||||
|
||||
static ssize_t ad5592r_show_scale_available(struct iio_dev *iio_dev,
|
||||
uintptr_t private,
|
||||
const struct iio_chan_spec *chan,
|
||||
char *buf)
|
||||
{
|
||||
struct ad5592r_state *st = iio_priv(iio_dev);
|
||||
|
||||
return sprintf(buf, "%d.%09u %d.%09u\n",
|
||||
st->scale_avail[0][0], st->scale_avail[0][1],
|
||||
st->scale_avail[1][0], st->scale_avail[1][1]);
|
||||
}
|
||||
|
||||
static struct iio_chan_spec_ext_info ad5592r_ext_info[] = {
|
||||
{
|
||||
.name = "scale_available",
|
||||
.read = ad5592r_show_scale_available,
|
||||
.shared = true,
|
||||
},
|
||||
{},
|
||||
};
|
||||
|
||||
static void ad5592r_setup_channel(struct iio_dev *iio_dev,
|
||||
struct iio_chan_spec *chan, bool output, unsigned id)
|
||||
{
|
||||
chan->type = IIO_VOLTAGE;
|
||||
chan->indexed = 1;
|
||||
chan->output = output;
|
||||
chan->channel = id;
|
||||
chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
|
||||
chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
|
||||
chan->scan_type.sign = 'u';
|
||||
chan->scan_type.realbits = 12;
|
||||
chan->scan_type.storagebits = 16;
|
||||
chan->ext_info = ad5592r_ext_info;
|
||||
}
|
||||
|
||||
static int ad5592r_alloc_channels(struct ad5592r_state *st)
|
||||
{
|
||||
unsigned i, curr_channel = 0,
|
||||
num_channels = st->num_channels;
|
||||
struct iio_dev *iio_dev = iio_priv_to_dev(st);
|
||||
struct iio_chan_spec *channels;
|
||||
struct fwnode_handle *child;
|
||||
u32 reg, tmp;
|
||||
int ret;
|
||||
|
||||
device_for_each_child_node(st->dev, child) {
|
||||
ret = fwnode_property_read_u32(child, "reg", ®);
|
||||
if (ret || reg > ARRAY_SIZE(st->channel_modes))
|
||||
continue;
|
||||
|
||||
ret = fwnode_property_read_u32(child, "adi,mode", &tmp);
|
||||
if (!ret)
|
||||
st->channel_modes[reg] = tmp;
|
||||
|
||||
fwnode_property_read_u32(child, "adi,off-state", &tmp);
|
||||
if (!ret)
|
||||
st->channel_offstate[reg] = tmp;
|
||||
}
|
||||
|
||||
channels = devm_kzalloc(st->dev,
|
||||
(1 + 2 * num_channels) * sizeof(*channels), GFP_KERNEL);
|
||||
if (!channels)
|
||||
return -ENOMEM;
|
||||
|
||||
for (i = 0; i < num_channels; i++) {
|
||||
switch (st->channel_modes[i]) {
|
||||
case CH_MODE_DAC:
|
||||
ad5592r_setup_channel(iio_dev, &channels[curr_channel],
|
||||
true, i);
|
||||
curr_channel++;
|
||||
break;
|
||||
|
||||
case CH_MODE_ADC:
|
||||
ad5592r_setup_channel(iio_dev, &channels[curr_channel],
|
||||
false, i);
|
||||
curr_channel++;
|
||||
break;
|
||||
|
||||
case CH_MODE_DAC_AND_ADC:
|
||||
ad5592r_setup_channel(iio_dev, &channels[curr_channel],
|
||||
true, i);
|
||||
curr_channel++;
|
||||
ad5592r_setup_channel(iio_dev, &channels[curr_channel],
|
||||
false, i);
|
||||
curr_channel++;
|
||||
break;
|
||||
|
||||
default:
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
channels[curr_channel].type = IIO_TEMP;
|
||||
channels[curr_channel].channel = 8;
|
||||
channels[curr_channel].info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
|
||||
BIT(IIO_CHAN_INFO_SCALE) |
|
||||
BIT(IIO_CHAN_INFO_OFFSET);
|
||||
curr_channel++;
|
||||
|
||||
iio_dev->num_channels = curr_channel;
|
||||
iio_dev->channels = channels;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void ad5592r_init_scales(struct ad5592r_state *st, int vref_mV)
|
||||
{
|
||||
s64 tmp = (s64)vref_mV * 1000000000LL >> 12;
|
||||
|
||||
st->scale_avail[0][0] =
|
||||
div_s64_rem(tmp, 1000000000LL, &st->scale_avail[0][1]);
|
||||
st->scale_avail[1][0] =
|
||||
div_s64_rem(tmp * 2, 1000000000LL, &st->scale_avail[1][1]);
|
||||
}
|
||||
|
||||
int ad5592r_probe(struct device *dev, const char *name,
|
||||
const struct ad5592r_rw_ops *ops)
|
||||
{
|
||||
struct iio_dev *iio_dev;
|
||||
struct ad5592r_state *st;
|
||||
int ret;
|
||||
|
||||
iio_dev = devm_iio_device_alloc(dev, sizeof(*st));
|
||||
if (!iio_dev)
|
||||
return -ENOMEM;
|
||||
|
||||
st = iio_priv(iio_dev);
|
||||
st->dev = dev;
|
||||
st->ops = ops;
|
||||
st->num_channels = 8;
|
||||
dev_set_drvdata(dev, iio_dev);
|
||||
|
||||
st->reg = devm_regulator_get_optional(dev, "vref");
|
||||
if (IS_ERR(st->reg)) {
|
||||
if ((PTR_ERR(st->reg) != -ENODEV) && dev->of_node)
|
||||
return PTR_ERR(st->reg);
|
||||
|
||||
st->reg = NULL;
|
||||
} else {
|
||||
ret = regulator_enable(st->reg);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
iio_dev->dev.parent = dev;
|
||||
iio_dev->name = name;
|
||||
iio_dev->info = &ad5592r_info;
|
||||
iio_dev->modes = INDIO_DIRECT_MODE;
|
||||
|
||||
ad5592r_init_scales(st, ad5592r_get_vref(st));
|
||||
|
||||
ret = ad5592r_reset(st);
|
||||
if (ret)
|
||||
goto error_disable_reg;
|
||||
|
||||
ret = ops->reg_write(st, AD5592R_REG_PD,
|
||||
(st->reg == NULL) ? AD5592R_REG_PD_EN_REF : 0);
|
||||
if (ret)
|
||||
goto error_disable_reg;
|
||||
|
||||
ret = ad5592r_alloc_channels(st);
|
||||
if (ret)
|
||||
goto error_disable_reg;
|
||||
|
||||
ret = ad5592r_set_channel_modes(st);
|
||||
if (ret)
|
||||
goto error_reset_ch_modes;
|
||||
|
||||
ret = iio_device_register(iio_dev);
|
||||
if (ret)
|
||||
goto error_reset_ch_modes;
|
||||
|
||||
ret = ad5592r_gpio_init(st);
|
||||
if (ret)
|
||||
goto error_dev_unregister;
|
||||
|
||||
return 0;
|
||||
|
||||
error_dev_unregister:
|
||||
iio_device_unregister(iio_dev);
|
||||
|
||||
error_reset_ch_modes:
|
||||
ad5592r_reset_channel_modes(st);
|
||||
|
||||
error_disable_reg:
|
||||
if (st->reg)
|
||||
regulator_disable(st->reg);
|
||||
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ad5592r_probe);
|
||||
|
||||
int ad5592r_remove(struct device *dev)
|
||||
{
|
||||
struct iio_dev *iio_dev = dev_get_drvdata(dev);
|
||||
struct ad5592r_state *st = iio_priv(iio_dev);
|
||||
|
||||
iio_device_unregister(iio_dev);
|
||||
ad5592r_reset_channel_modes(st);
|
||||
ad5592r_gpio_cleanup(st);
|
||||
|
||||
if (st->reg)
|
||||
regulator_disable(st->reg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ad5592r_remove);
|
||||
|
||||
MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
|
||||
MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,76 @@
|
|||
/*
|
||||
* AD5592R / AD5593R Digital <-> Analog converters driver
|
||||
*
|
||||
* Copyright 2015-2016 Analog Devices Inc.
|
||||
* Author: Paul Cercueil <paul.cercueil@analog.com>
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#ifndef __DRIVERS_IIO_DAC_AD5592R_BASE_H__
|
||||
#define __DRIVERS_IIO_DAC_AD5592R_BASE_H__
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <linux/cache.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/gpio/driver.h>
|
||||
|
||||
struct device;
|
||||
struct ad5592r_state;
|
||||
|
||||
enum ad5592r_registers {
|
||||
AD5592R_REG_NOOP = 0x0,
|
||||
AD5592R_REG_DAC_READBACK = 0x1,
|
||||
AD5592R_REG_ADC_SEQ = 0x2,
|
||||
AD5592R_REG_CTRL = 0x3,
|
||||
AD5592R_REG_ADC_EN = 0x4,
|
||||
AD5592R_REG_DAC_EN = 0x5,
|
||||
AD5592R_REG_PULLDOWN = 0x6,
|
||||
AD5592R_REG_LDAC = 0x7,
|
||||
AD5592R_REG_GPIO_OUT_EN = 0x8,
|
||||
AD5592R_REG_GPIO_SET = 0x9,
|
||||
AD5592R_REG_GPIO_IN_EN = 0xA,
|
||||
AD5592R_REG_PD = 0xB,
|
||||
AD5592R_REG_OPEN_DRAIN = 0xC,
|
||||
AD5592R_REG_TRISTATE = 0xD,
|
||||
AD5592R_REG_RESET = 0xF,
|
||||
};
|
||||
|
||||
#define AD5592R_REG_PD_EN_REF BIT(9)
|
||||
#define AD5592R_REG_CTRL_ADC_RANGE BIT(5)
|
||||
#define AD5592R_REG_CTRL_DAC_RANGE BIT(4)
|
||||
|
||||
struct ad5592r_rw_ops {
|
||||
int (*write_dac)(struct ad5592r_state *st, unsigned chan, u16 value);
|
||||
int (*read_adc)(struct ad5592r_state *st, unsigned chan, u16 *value);
|
||||
int (*reg_write)(struct ad5592r_state *st, u8 reg, u16 value);
|
||||
int (*reg_read)(struct ad5592r_state *st, u8 reg, u16 *value);
|
||||
int (*gpio_read)(struct ad5592r_state *st, u8 *value);
|
||||
};
|
||||
|
||||
struct ad5592r_state {
|
||||
struct device *dev;
|
||||
struct regulator *reg;
|
||||
struct gpio_chip gpiochip;
|
||||
struct mutex gpio_lock; /* Protect cached gpio_out, gpio_val, etc. */
|
||||
unsigned int num_channels;
|
||||
const struct ad5592r_rw_ops *ops;
|
||||
int scale_avail[2][2];
|
||||
u16 cached_dac[8];
|
||||
u16 cached_gp_ctrl;
|
||||
u8 channel_modes[8];
|
||||
u8 channel_offstate[8];
|
||||
u8 gpio_map;
|
||||
u8 gpio_out;
|
||||
u8 gpio_in;
|
||||
u8 gpio_val;
|
||||
|
||||
__be16 spi_msg ____cacheline_aligned;
|
||||
__be16 spi_msg_nop;
|
||||
};
|
||||
|
||||
int ad5592r_probe(struct device *dev, const char *name,
|
||||
const struct ad5592r_rw_ops *ops);
|
||||
int ad5592r_remove(struct device *dev);
|
||||
|
||||
#endif /* __DRIVERS_IIO_DAC_AD5592R_BASE_H__ */
|
||||
|
|
@ -0,0 +1,164 @@
|
|||
/*
|
||||
* AD5592R Digital <-> Analog converters driver
|
||||
*
|
||||
* Copyright 2015-2016 Analog Devices Inc.
|
||||
* Author: Paul Cercueil <paul.cercueil@analog.com>
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#include "ad5592r-base.h"
|
||||
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/spi/spi.h>
|
||||
|
||||
#define AD5592R_GPIO_READBACK_EN BIT(10)
|
||||
#define AD5592R_LDAC_READBACK_EN BIT(6)
|
||||
|
||||
static int ad5592r_spi_wnop_r16(struct ad5592r_state *st, u16 *buf)
|
||||
{
|
||||
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
||||
struct spi_transfer t = {
|
||||
.tx_buf = &st->spi_msg_nop,
|
||||
.rx_buf = buf,
|
||||
.len = 2
|
||||
};
|
||||
|
||||
st->spi_msg_nop = 0; /* NOP */
|
||||
|
||||
return spi_sync_transfer(spi, &t, 1);
|
||||
}
|
||||
|
||||
static int ad5592r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
|
||||
{
|
||||
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
||||
|
||||
st->spi_msg = cpu_to_be16(BIT(15) | (chan << 12) | value);
|
||||
|
||||
return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
|
||||
}
|
||||
|
||||
static int ad5592r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
|
||||
{
|
||||
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
||||
int ret;
|
||||
|
||||
st->spi_msg = cpu_to_be16((AD5592R_REG_ADC_SEQ << 11) | BIT(chan));
|
||||
|
||||
ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* Invalid data:
|
||||
* See Figure 40. Single-Channel ADC Conversion Sequence
|
||||
*/
|
||||
ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
*value = be16_to_cpu(st->spi_msg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ad5592r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
|
||||
{
|
||||
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
||||
|
||||
st->spi_msg = cpu_to_be16((reg << 11) | value);
|
||||
|
||||
return spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
|
||||
}
|
||||
|
||||
static int ad5592r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
|
||||
{
|
||||
struct spi_device *spi = container_of(st->dev, struct spi_device, dev);
|
||||
int ret;
|
||||
|
||||
st->spi_msg = cpu_to_be16((AD5592R_REG_LDAC << 11) |
|
||||
AD5592R_LDAC_READBACK_EN | (reg << 2));
|
||||
|
||||
ret = spi_write(spi, &st->spi_msg, sizeof(st->spi_msg));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
*value = be16_to_cpu(st->spi_msg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = ad5592r_reg_write(st, AD5592R_REG_GPIO_IN_EN,
|
||||
AD5592R_GPIO_READBACK_EN | st->gpio_in);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = ad5592r_spi_wnop_r16(st, &st->spi_msg);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
*value = (u8) be16_to_cpu(st->spi_msg);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct ad5592r_rw_ops ad5592r_rw_ops = {
|
||||
.write_dac = ad5592r_write_dac,
|
||||
.read_adc = ad5592r_read_adc,
|
||||
.reg_write = ad5592r_reg_write,
|
||||
.reg_read = ad5592r_reg_read,
|
||||
.gpio_read = ad5593r_gpio_read,
|
||||
};
|
||||
|
||||
static int ad5592r_spi_probe(struct spi_device *spi)
|
||||
{
|
||||
const struct spi_device_id *id = spi_get_device_id(spi);
|
||||
|
||||
return ad5592r_probe(&spi->dev, id->name, &ad5592r_rw_ops);
|
||||
}
|
||||
|
||||
static int ad5592r_spi_remove(struct spi_device *spi)
|
||||
{
|
||||
return ad5592r_remove(&spi->dev);
|
||||
}
|
||||
|
||||
static const struct spi_device_id ad5592r_spi_ids[] = {
|
||||
{ .name = "ad5592r", },
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(spi, ad5592r_spi_ids);
|
||||
|
||||
static const struct of_device_id ad5592r_of_match[] = {
|
||||
{ .compatible = "adi,ad5592r", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, ad5592r_of_match);
|
||||
|
||||
static struct spi_driver ad5592r_spi_driver = {
|
||||
.driver = {
|
||||
.name = "ad5592r",
|
||||
.of_match_table = of_match_ptr(ad5592r_of_match),
|
||||
},
|
||||
.probe = ad5592r_spi_probe,
|
||||
.remove = ad5592r_spi_remove,
|
||||
.id_table = ad5592r_spi_ids,
|
||||
};
|
||||
module_spi_driver(ad5592r_spi_driver);
|
||||
|
||||
MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
|
||||
MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,131 @@
|
|||
/*
|
||||
* AD5593R Digital <-> Analog converters driver
|
||||
*
|
||||
* Copyright 2015-2016 Analog Devices Inc.
|
||||
* Author: Paul Cercueil <paul.cercueil@analog.com>
|
||||
*
|
||||
* Licensed under the GPL-2.
|
||||
*/
|
||||
|
||||
#include "ad5592r-base.h"
|
||||
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/i2c.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of.h>
|
||||
|
||||
#define AD5593R_MODE_CONF (0 << 4)
|
||||
#define AD5593R_MODE_DAC_WRITE (1 << 4)
|
||||
#define AD5593R_MODE_ADC_READBACK (4 << 4)
|
||||
#define AD5593R_MODE_DAC_READBACK (5 << 4)
|
||||
#define AD5593R_MODE_GPIO_READBACK (6 << 4)
|
||||
#define AD5593R_MODE_REG_READBACK (7 << 4)
|
||||
|
||||
static int ad5593r_write_dac(struct ad5592r_state *st, unsigned chan, u16 value)
|
||||
{
|
||||
struct i2c_client *i2c = to_i2c_client(st->dev);
|
||||
|
||||
return i2c_smbus_write_word_swapped(i2c,
|
||||
AD5593R_MODE_DAC_WRITE | chan, value);
|
||||
}
|
||||
|
||||
static int ad5593r_read_adc(struct ad5592r_state *st, unsigned chan, u16 *value)
|
||||
{
|
||||
struct i2c_client *i2c = to_i2c_client(st->dev);
|
||||
s32 val;
|
||||
|
||||
val = i2c_smbus_write_word_swapped(i2c,
|
||||
AD5593R_MODE_CONF | AD5592R_REG_ADC_SEQ, BIT(chan));
|
||||
if (val < 0)
|
||||
return (int) val;
|
||||
|
||||
val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_ADC_READBACK);
|
||||
if (val < 0)
|
||||
return (int) val;
|
||||
|
||||
*value = (u16) val;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ad5593r_reg_write(struct ad5592r_state *st, u8 reg, u16 value)
|
||||
{
|
||||
struct i2c_client *i2c = to_i2c_client(st->dev);
|
||||
|
||||
return i2c_smbus_write_word_swapped(i2c,
|
||||
AD5593R_MODE_CONF | reg, value);
|
||||
}
|
||||
|
||||
static int ad5593r_reg_read(struct ad5592r_state *st, u8 reg, u16 *value)
|
||||
{
|
||||
struct i2c_client *i2c = to_i2c_client(st->dev);
|
||||
s32 val;
|
||||
|
||||
val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_REG_READBACK | reg);
|
||||
if (val < 0)
|
||||
return (int) val;
|
||||
|
||||
*value = (u16) val;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ad5593r_gpio_read(struct ad5592r_state *st, u8 *value)
|
||||
{
|
||||
struct i2c_client *i2c = to_i2c_client(st->dev);
|
||||
s32 val;
|
||||
|
||||
val = i2c_smbus_read_word_swapped(i2c, AD5593R_MODE_GPIO_READBACK);
|
||||
if (val < 0)
|
||||
return (int) val;
|
||||
|
||||
*value = (u8) val;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct ad5592r_rw_ops ad5593r_rw_ops = {
|
||||
.write_dac = ad5593r_write_dac,
|
||||
.read_adc = ad5593r_read_adc,
|
||||
.reg_write = ad5593r_reg_write,
|
||||
.reg_read = ad5593r_reg_read,
|
||||
.gpio_read = ad5593r_gpio_read,
|
||||
};
|
||||
|
||||
static int ad5593r_i2c_probe(struct i2c_client *i2c,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
return ad5592r_probe(&i2c->dev, id->name, &ad5593r_rw_ops);
|
||||
}
|
||||
|
||||
static int ad5593r_i2c_remove(struct i2c_client *i2c)
|
||||
{
|
||||
return ad5592r_remove(&i2c->dev);
|
||||
}
|
||||
|
||||
static const struct i2c_device_id ad5593r_i2c_ids[] = {
|
||||
{ .name = "ad5593r", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(i2c, ad5593r_i2c_ids);
|
||||
|
||||
static const struct of_device_id ad5593r_of_match[] = {
|
||||
{ .compatible = "adi,ad5593r", },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, ad5593r_of_match);
|
||||
|
||||
static struct i2c_driver ad5593r_driver = {
|
||||
.driver = {
|
||||
.name = "ad5593r",
|
||||
.of_match_table = of_match_ptr(ad5593r_of_match),
|
||||
},
|
||||
.probe = ad5593r_i2c_probe,
|
||||
.remove = ad5593r_i2c_remove,
|
||||
.id_table = ad5593r_i2c_ids,
|
||||
};
|
||||
module_i2c_driver(ad5593r_driver);
|
||||
|
||||
MODULE_AUTHOR("Paul Cercueil <paul.cercueil@analog.com>");
|
||||
MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
|
|
@ -0,0 +1,16 @@
|
|||
|
||||
#ifndef _DT_BINDINGS_ADI_AD5592R_H
|
||||
#define _DT_BINDINGS_ADI_AD5592R_H
|
||||
|
||||
#define CH_MODE_UNUSED 0
|
||||
#define CH_MODE_ADC 1
|
||||
#define CH_MODE_DAC 2
|
||||
#define CH_MODE_DAC_AND_ADC 3
|
||||
#define CH_MODE_GPIO 8
|
||||
|
||||
#define CH_OFFSTATE_PULLDOWN 0
|
||||
#define CH_OFFSTATE_OUT_LOW 1
|
||||
#define CH_OFFSTATE_OUT_HIGH 2
|
||||
#define CH_OFFSTATE_OUT_TRISTATE 3
|
||||
|
||||
#endif /* _DT_BINDINGS_ADI_AD5592R_H */
|
||||
Loading…
Reference in New Issue