On 28/03/16 15:30, Jonathan Cameron wrote:
> On 23/03/16 08:19, michael.hennerich@xxxxxxxxxx wrote:
>> From: Paul Cercueil <paul.cercueil@xxxxxxxxxx>
>>
>> This patch adds support for the AD5592R (spi) and AD5593R (i2c)
>> ADC/DAC/GPIO devices.
>>
>> Signed-off-by: Paul Cercueil <paul.cercueil@xxxxxxxxxx>
>> Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
>>
> A few little bits and pieces in line. Biggest one to me is whether Linus
> Walleij is happy with the gpio chip related parts. I'm unconvinced you
> have completely addressed his points in the earlier review - but then I wasn't
> closely following the thread so perhaps I missed a consensus being reached.
>
> Anyhow, as it contains a gpiochip it needs an Ack from Linus or Alexandre
> before I take it.
Working backwards looks like Linus was fairly happy, but still need that
format ack I think.
Jonathan
>
> IIO parts look pretty good to me.
>
> Thanks,
>
> Jonathan
>> ---
>>
>> Changes since v1:
>> * Fix mutex usage
>> * Remove unnecessary NULL pointer guards
>> * Add comment explaining the invalid data read
>> * AD5593R Remove surplus adc readback
>>
>> Changes since v2:
>> * Use child nodes to describe channels
>> * Fix probe return and driver remove path
>> * Move locking closer to where its used
>> * Remove WARN_ON but return error
>> * Remove OPEN DRAIN configuration option
>>
>> Changes since v3:
>> * Documentation: Add missing vendor prefixes in the examples
>> * Minor function reordering in remove() to match the reverse of probe()
>>
>> Changes since v4:
>> * Documentation: Add missing gpio bindings
>> * Kconfig: Select GPIOLIB and remove ifdefs in code
> Looks like one of these snuck through...
>
>> * Remove surplus error check in ad5592r_gpio_request()
>> * Add comment about reset magic
>> ---
>> .../devicetree/bindings/iio/dac/ad5592r.txt | 152 +++++
>> drivers/iio/dac/Kconfig | 27 +
>> drivers/iio/dac/Makefile | 3 +
>> drivers/iio/dac/ad5592r-base.c | 694 +++++++++++++++++++++
>> drivers/iio/dac/ad5592r-base.h | 78 +++
>> drivers/iio/dac/ad5592r.c | 164 +++++
>> drivers/iio/dac/ad5593r.c | 131 ++++
>> include/dt-bindings/iio/adi,ad5592r.h | 16 +
>> 8 files changed, 1265 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/iio/dac/ad5592r.txt
>> create mode 100644 drivers/iio/dac/ad5592r-base.c
>> create mode 100644 drivers/iio/dac/ad5592r-base.h
>> create mode 100644 drivers/iio/dac/ad5592r.c
>> create mode 100644 drivers/iio/dac/ad5593r.c
>> create mode 100644 include/dt-bindings/iio/adi,ad5592r.h
>>
>> diff --git a/Documentation/devicetree/bindings/iio/dac/ad5592r.txt b/Documentation/devicetree/bindings/iio/dac/ad5592r.txt
>> new file mode 100644
>> index 0000000..35f76d7
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/dac/ad5592r.txt
>> @@ -0,0 +1,152 @@
>> +Analog Devices AD5592R/AD5593R DAC/ADC device driver
>> +
>> +Required properties for the AD5592R:
>> + - compatible: Must be "adi,ad5592r"
>> + - reg: SPI chip select number for the device
>> + - spi-max-frequency: Max SPI frequency to use (< 30000000)
>> + - spi-cpol: The AD5592R requires inverse clock polarity (CPOL) mode
>> +
>> +Required properties for the AD5593R:
>> + - compatible: Must be "adi,ad5593r"
>> + - reg: I2C address of the device
>> +
>> +Required properties for all supported chips:
>> + - #address-cells: Should be 1.
>> + - #size-cells: Should be 0.
>> + - channel nodes:
>> + Each child node represents one channel and has the following
>> + Required properties:
>> + * reg: Pin on which this channel is connected to.
>> + * adi,mode: Mode or function of this channel.
>> + Macros specifying the valid values
>> + can be found in <dt-bindings/iio/adi,ad5592r.h>.
>> +
>> + The following values are currently supported:
>> + * CH_MODE_UNUSED (the pin is unused)
>> + * CH_MODE_ADC (the pin is ADC input)
>> + * CH_MODE_DAC (the pin is DAC output)
>> + * CH_MODE_DAC_AND_ADC (the pin is DAC output
>> + but can be monitored by an ADC)
> Really silly question. What is the disadvantage of configuring all dac
> channels in this mode?
> Might make sense to document this here to give people writing the dt
> files a hint.
>
>> + * CH_MODE_GPIO (the pin is registered
>> + with GPIOLIB)
>> + Optional properties:
>> + * adi,off-state: State of this channel when unused or the
>> + device gets removed. Macros specifying the
>> + valid values can be found in
>> + <dt-bindings/iio/adi,ad5592r.h>.
>> +
>> + * CH_OFFSTATE_PULLDOWN (the pin is pulled down)
>> + * CH_OFFSTATE_OUT_LOW (the pin is output low)
>> + * CH_OFFSTATE_OUT_HIGH (the pin is output high)
>> + * CH_OFFSTATE_OUT_TRISTATE (the pin is
>> + tristated output)
>> +
>> +
>> +Optional properties:
>> + - vref-supply: Phandle to the external reference voltage supply. This should
>> + only be set if there is an external reference voltage connected to the VREF
>> + pin. If the property is not set the internal 2.5V reference is used.
>> + - reset-gpios : GPIO spec for the RESET pin. If specified, it will be
>> + asserted during driver probe.
>> + - gpio-controller: Marks the device node as a GPIO controller.
>> + - #gpio-cells: Should be 2. The first cell is the GPIO number and the second
>> + cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>.
>> +
>> +AD5592R Example:
>> +
>> + #include <dt-bindings/iio/adi,ad5592r.h>
>> +
>> + vref: regulator-vref {
>> + compatible = "regulator-fixed";
>> + regulator-name = "vref-ad559x";
>> + regulator-min-microvolt = <3300000>;
>> + regulator-max-microvolt = <3300000>;
>> + regulator-always-on;
>> + };
>> +
>> + ad5592r@0 {
>> + #size-cells = <0>;
>> + #address-cells = <1>;
>> + #gpio-cells = <2>;
>> + compatible = "adi,ad5592r";
>> + reg = <0>;
>> +
>> + spi-max-frequency = <1000000>;
>> + spi-cpol;
>> +
>> + vref-supply = <&vref>; /* optional */
>> + reset-gpios = <&gpio0 86 0>; /* optional */
>> + gpio-controller;
>> +
>> + channel@0 {
>> + reg = <0>;
>> + adi,mode = <CH_MODE_DAC>;
>> + };
>> + channel@1 {
>> + reg = <1>;
>> + adi,mode = <CH_MODE_ADC>;
>> + };
>> + channel@2 {
>> + reg = <2>;
>> + adi,mode = <CH_MODE_DAC_AND_ADC>;
>> + };
>> + channel@3 {
>> + reg = <3>;
>> + adi,mode = <CH_MODE_DAC_AND_ADC>;
>> + adi,off-state = <CH_OFFSTATE_PULLDOWN>;
>> + };
>> + channel@4 {
>> + reg = <4>;
>> + adi,mode = <CH_MODE_UNUSED>;
>> + adi,off-state = <CH_OFFSTATE_PULLDOWN>;
>> + };
>> + channel@5 {
>> + reg = <5>;
>> + adi,mode = <CH_MODE_GPIO>;
>> + adi,off-state = <CH_OFFSTATE_PULLDOWN>;
>> + };
>> + channel@6 {
>> + reg = <6>;
>> + adi,mode = <CH_MODE_GPIO>;
>> + adi,off-state = <CH_OFFSTATE_PULLDOWN>;
>> + };
>> + channel@7 {
>> + reg = <7>;
>> + adi,mode = <CH_MODE_GPIO>;
>> + adi,off-state = <CH_OFFSTATE_PULLDOWN>;
>> + };
>> + };
>> +
>> +AD5593R Example:
>> +
>> + #include <dt-bindings/iio/adi,ad5592r.h>
>> +
>> + ad5593r@10 {
>> + #size-cells = <0>;
>> + #address-cells = <1>;
>> + #gpio-cells = <2>;
>> + compatible = "adi,ad5593r";
>> + reg = <0x10>;
>> + gpio-controller;
>> +
>> + channel@0 {
>> + reg = <0>;
>> + adi,mode = <CH_MODE_DAC>;
>> + adi,off-state = <CH_OFFSTATE_PULLDOWN>;
>> + };
>> + channel@1 {
>> + reg = <1>;
>> + adi,mode = <CH_MODE_ADC>;
>> + adi,off-state = <CH_OFFSTATE_PULLDOWN>;
>> + };
>> + channel@2 {
>> + reg = <2>;
>> + adi,mode = <CH_MODE_DAC_AND_ADC>;
>> + adi,off-state = <CH_OFFSTATE_PULLDOWN>;
>> + };
>> + channel@6 {
>> + reg = <6>;
>> + adi,mode = <CH_MODE_GPIO>;
>> + adi,off-state = <CH_OFFSTATE_PULLDOWN>;
>> + };
>> + };
>> diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
>> index a995139..233dfb7 100644
>> --- a/drivers/iio/dac/Kconfig
>> +++ b/drivers/iio/dac/Kconfig
>> @@ -74,6 +74,33 @@ config AD5449
>> To compile this driver as a module, choose M here: the
>> module will be called ad5449.
>>
>> +config AD5592R_BASE
>> + tristate
>> +
>> +config AD5592R
>> + tristate "Analog Devices AD5592R ADC/DAC driver"
>> + depends on SPI_MASTER
>> + select GPIOLIB
>> + select AD5592R_BASE
>> + help
>> + Say yes here to build support for Analog Devices AD5592R
>> + Digital to Analog / Analog to Digital Converter.
>> +
>> + To compile this driver as a module, choose M here: the
>> + module will be called ad5592r.
>> +
>> +config AD5593R
>> + tristate "Analog Devices AD5593R ADC/DAC driver"
>> + depends on I2C
>> + select GPIOLIB
>> + select AD5592R_BASE
>> + help
>> + Say yes here to build support for Analog Devices AD5593R
>> + Digital to Analog / Analog to Digital Converter.
>> +
>> + To compile this driver as a module, choose M here: the
>> + module will be called ad5593r.
>> +
>> config AD5504
>> tristate "Analog Devices AD5504/AD5501 DAC SPI driver"
>> depends on SPI
>> diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
>> index 67b4842..de28cd2 100644
>> --- a/drivers/iio/dac/Makefile
>> +++ b/drivers/iio/dac/Makefile
>> @@ -11,6 +11,9 @@ obj-$(CONFIG_AD5064) += ad5064.o
>> obj-$(CONFIG_AD5504) += ad5504.o
>> obj-$(CONFIG_AD5446) += ad5446.o
>> obj-$(CONFIG_AD5449) += ad5449.o
>> +obj-$(CONFIG_AD5592R_BASE) += ad5592r-base.o
>> +obj-$(CONFIG_AD5592R) += ad5592r.o
>> +obj-$(CONFIG_AD5593R) += ad5593r.o
>> obj-$(CONFIG_AD5755) += ad5755.o
>> obj-$(CONFIG_AD5761) += ad5761.o
>> obj-$(CONFIG_AD5764) += ad5764.o
>> diff --git a/drivers/iio/dac/ad5592r-base.c b/drivers/iio/dac/ad5592r-base.c
>> new file mode 100644
>> index 0000000..4019e44
>> --- /dev/null
>> +++ b/drivers/iio/dac/ad5592r-base.c
>> @@ -0,0 +1,694 @@
>> +/*
>> + * AD5592R Digital <-> Analog converters driver
>> + *
>> + * Copyright 2014-2016 Analog Devices Inc.
>> + * Author: Paul Cercueil <paul.cercueil@xxxxxxxxxx>
>> + *
>> + * Licensed under the GPL-2.
>> + */
>> +
>> +#include <linux/bitops.h>
>> +#include <linux/delay.h>
>> +#include <linux/iio/iio.h>
>> +#include <linux/module.h>
>> +#include <linux/mutex.h>
>> +#include <linux/of.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/gpio/driver.h>
>> +#include <linux/gpio.h>
>> +#include <linux/property.h>
>> +
>> +#include <dt-bindings/iio/adi,ad5592r.h>
>> +
>> +#include "ad5592r-base.h"
>> +
>> +static int ad5592r_gpio_get(struct gpio_chip *chip, unsigned offset)
>> +{
>> + struct ad5592r_state *st = gpiochip_get_data(chip);
>> + int ret = 0;
>> + u8 val;
>> +
>> + mutex_lock(&st->gpio_lock);
>> +
>> + if (st->gpio_out & BIT(offset))
>> + val = st->gpio_val;
>> + else
>> + ret = st->ops->gpio_read(st, &val);
>> +
>> + mutex_unlock(&st->gpio_lock);
>> +
>> + if (ret < 0)
>> + return ret;
>> +
>> + return !!(val & BIT(offset));
>> +}
>> +
>> +static void ad5592r_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
>> +{
>> + struct ad5592r_state *st = gpiochip_get_data(chip);
>> +
>> + mutex_lock(&st->gpio_lock);
>> +
>> + if (value)
>> + st->gpio_val |= BIT(offset);
>> + else
>> + st->gpio_val &= ~BIT(offset);
>> +
>> + st->ops->reg_write(st, AD5592R_REG_GPIO_SET, st->gpio_val);
>> +
>> + mutex_unlock(&st->gpio_lock);
>> +}
>> +
>> +static int ad5592r_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
>> +{
>> + struct ad5592r_state *st = gpiochip_get_data(chip);
>> + int ret;
>> +
>> + mutex_lock(&st->gpio_lock);
>> +
>> + st->gpio_out &= ~BIT(offset);
>> + st->gpio_in |= BIT(offset);
>> +
>> + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_OUT_EN, st->gpio_out);
>> + if (ret < 0)
>> + goto err_unlock;
>> +
>> + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_IN_EN, st->gpio_in);
>> +
>> +err_unlock:
>> + mutex_unlock(&st->gpio_lock);
>> +
>> + return ret;
>> +}
>> +
>> +static int ad5592r_gpio_direction_output(struct gpio_chip *chip,
>> + unsigned offset, int value)
>> +{
>> + struct ad5592r_state *st = gpiochip_get_data(chip);
>> + int ret;
>> +
>> + mutex_lock(&st->gpio_lock);
>> +
>> + if (value)
>> + st->gpio_val |= BIT(offset);
>> + else
>> + st->gpio_val &= ~BIT(offset);
>> +
>> + st->gpio_in &= ~BIT(offset);
>> + st->gpio_out |= BIT(offset);
>> +
>> + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_SET, st->gpio_val);
>> + if (ret < 0)
>> + goto err_unlock;
>> +
>> + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_OUT_EN, st->gpio_out);
>> + if (ret < 0)
>> + goto err_unlock;
>> +
>> + ret = st->ops->reg_write(st, AD5592R_REG_GPIO_IN_EN, st->gpio_in);
>> +
>> +err_unlock:
>> + mutex_unlock(&st->gpio_lock);
>> +
>> + return ret;
>> +}
>> +
>> +static int ad5592r_gpio_request(struct gpio_chip *chip, unsigned offset)
>> +{
>> + struct ad5592r_state *st = gpiochip_get_data(chip);
>> +
>> + if (!(st->gpio_map & BIT(offset))) {
>> + dev_err(st->dev, "GPIO %d is reserved by alternate function\n",
>> + offset);
>> + return -ENODEV;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int ad5592r_gpio_init(struct ad5592r_state *st)
>> +{
>> + if (!st->gpio_map)
>> + return 0;
>> +
>> + st->gpiochip.label = dev_name(st->dev);
>> + st->gpiochip.base = -1;
>> + st->gpiochip.ngpio = 8;
>> + st->gpiochip.parent = st->dev;
>> + st->gpiochip.can_sleep = true;
>> + st->gpiochip.direction_input = ad5592r_gpio_direction_input;
>> + st->gpiochip.direction_output = ad5592r_gpio_direction_output;
>> + st->gpiochip.get = ad5592r_gpio_get;
>> + st->gpiochip.set = ad5592r_gpio_set;
>> + st->gpiochip.request = ad5592r_gpio_request;
>> + st->gpiochip.owner = THIS_MODULE;
>> +
>> + mutex_init(&st->gpio_lock);
>> +
>> + return gpiochip_add_data(&st->gpiochip, st);
>> +}
>> +
>> +static void ad5592r_gpio_cleanup(struct ad5592r_state *st)
>> +{
>> + if (st->gpio_map)
>> + gpiochip_remove(&st->gpiochip);
>> +}
>> +
>> +static int ad5592r_reset(struct ad5592r_state *st)
>> +{
>> + struct gpio_desc *gpio;
>> + struct iio_dev *iio_dev = iio_priv_to_dev(st);
>> +
>> + gpio = devm_gpiod_get_optional(st->dev, "reset", GPIOD_OUT_LOW);
>> + if (IS_ERR(gpio))
>> + return PTR_ERR(gpio);
>> +
>> + if (gpio) {
>> + udelay(1);
>> + gpiod_set_value(gpio, 1);
>> + } else {
>> + mutex_lock(&iio_dev->mlock);
>> + /* Writing this magic value resets the device */
>> + st->ops->reg_write(st, AD5592R_REG_RESET, 0xdac);
>> + mutex_unlock(&iio_dev->mlock);
>> + }
>> +
>> + udelay(250);
>> +
>> + return 0;
>> +}
>> +
>> +static int ad5592r_get_vref(struct ad5592r_state *st)
>> +{
>> + int ret;
>> +
>> + if (st->reg) {
>> + ret = regulator_get_voltage(st->reg);
>> + if (ret < 0)
>> + return ret;
>> +
>> + return ret / 1000;
>> + } else {
>> + return 2500;
>> + }
>> +}
>> +
>> +static int ad5592r_set_channel_modes(struct ad5592r_state *st)
>> +{
>> + const struct ad5592r_rw_ops *ops = st->ops;
>> + int ret;
>> + unsigned i;
>> + struct iio_dev *iio_dev = iio_priv_to_dev(st);
>> + u8 pulldown = 0, tristate = 0, dac = 0, adc = 0;
>> + u16 read_back;
>> +
>> + for (i = 0; i < st->num_channels; i++) {
>> + switch (st->channel_modes[i]) {
>> + case CH_MODE_DAC:
>> + dac |= BIT(i);
>> + break;
>> +
>> + case CH_MODE_ADC:
>> + adc |= BIT(i);
>> + break;
>> +
>> + case CH_MODE_DAC_AND_ADC:
>> + dac |= BIT(i);
>> + adc |= BIT(i);
>> + break;
>> +
>> + case CH_MODE_GPIO:
>> + st->gpio_map |= BIT(i);
>> + st->gpio_in |= BIT(i); /* Default to input */
>> + break;
>> +
>> + case CH_MODE_UNUSED:
>> + /* fall-through */
>> + default:
>> + switch (st->channel_offstate[i]) {
>> + case CH_OFFSTATE_OUT_TRISTATE:
>> + tristate |= BIT(i);
>> + break;
>> +
>> + case CH_OFFSTATE_OUT_LOW:
>> + st->gpio_out |= BIT(i);
>> + break;
>> +
>> + case CH_OFFSTATE_OUT_HIGH:
>> + st->gpio_out |= BIT(i);
>> + st->gpio_val |= BIT(i);
>> + break;
>> +
>> + case CH_OFFSTATE_PULLDOWN:
>> + /* fall-through */
>> + default:
>> + pulldown |= BIT(i);
>> + break;
>> + }
>> + }
>> + }
>> +
>> + mutex_lock(&iio_dev->mlock);
>> +
>> + /* Pull down unused pins to GND */
>> + ret = ops->reg_write(st, AD5592R_REG_PULLDOWN, pulldown);
>> + if (ret)
>> + goto err_unlock;
>> +
>> + ret = ops->reg_write(st, AD5592R_REG_TRISTATE, tristate);
>> + if (ret)
>> + goto err_unlock;
>> +
>> + /* Configure pins that we use */
>> + ret = ops->reg_write(st, AD5592R_REG_DAC_EN, dac);
>> + if (ret)
>> + goto err_unlock;
>> +
>> + ret = ops->reg_write(st, AD5592R_REG_ADC_EN, adc);
>> + if (ret)
>> + goto err_unlock;
>> +
>> + ret = ops->reg_write(st, AD5592R_REG_GPIO_SET, st->gpio_val);
>> + if (ret)
>> + goto err_unlock;
>> +
>> + ret = ops->reg_write(st, AD5592R_REG_GPIO_OUT_EN, st->gpio_out);
>> + if (ret)
>> + goto err_unlock;
>> +
>> + ret = ops->reg_write(st, AD5592R_REG_GPIO_IN_EN, st->gpio_in);
>> + if (ret)
>> + 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);
>> + if (ret < 0)
>> + return ret;
>> +
> Spot the obvious simplication between these few lines ;) It returns ret whatever
> the value of ret, so don't check it.
>> + 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@xxxxxxxxxx>");
>> +MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/iio/dac/ad5592r-base.h b/drivers/iio/dac/ad5592r-base.h
>> new file mode 100644
>> index 0000000..2753385
>> --- /dev/null
>> +++ b/drivers/iio/dac/ad5592r-base.h
>> @@ -0,0 +1,78 @@
>> +/*
>> + * AD5592R / AD5593R Digital <-> Analog converters driver
>> + *
>> + * Copyright 2015-2016 Analog Devices Inc.
>> + * Author: Paul Cercueil <paul.cercueil@xxxxxxxxxx>
>> + *
>> + * 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;
>
> Guessing this ifdef was meant to go.
>> +#ifdef CONFIG_GPIOLIB
>> + struct gpio_chip gpiochip;
>> + struct mutex gpio_lock; /* Protect cached gpio_out, gpio_val, etc. */
>> +#endif
>> + 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__ */
>> diff --git a/drivers/iio/dac/ad5592r.c b/drivers/iio/dac/ad5592r.c
>> new file mode 100644
>> index 0000000..0b235a2
>> --- /dev/null
>> +++ b/drivers/iio/dac/ad5592r.c
>> @@ -0,0 +1,164 @@
>> +/*
>> + * AD5592R Digital <-> Analog converters driver
>> + *
>> + * Copyright 2015-2016 Analog Devices Inc.
>> + * Author: Paul Cercueil <paul.cercueil@xxxxxxxxxx>
>> + *
>> + * 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@xxxxxxxxxx>");
>> +MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/iio/dac/ad5593r.c b/drivers/iio/dac/ad5593r.c
>> new file mode 100644
>> index 0000000..dca158a
>> --- /dev/null
>> +++ b/drivers/iio/dac/ad5593r.c
>> @@ -0,0 +1,131 @@
>> +/*
>> + * AD5593R Digital <-> Analog converters driver
>> + *
>> + * Copyright 2015-2016 Analog Devices Inc.
>> + * Author: Paul Cercueil <paul.cercueil@xxxxxxxxxx>
>> + *
>> + * 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@xxxxxxxxxx>");
>> +MODULE_DESCRIPTION("Analog Devices AD5592R multi-channel converters");
>> +MODULE_LICENSE("GPL v2");
>> diff --git a/include/dt-bindings/iio/adi,ad5592r.h b/include/dt-bindings/iio/adi,ad5592r.h
>> new file mode 100644
>> index 0000000..c48aca1
>> --- /dev/null
>> +++ b/include/dt-bindings/iio/adi,ad5592r.h
>> @@ -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 */
>>
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