From: Paul Cercueil <paul.cercueil@xxxxxxxxxx>
This patch adds support for the AD5592R (spi) and AD5593R (i2c)
ADC/DAC devices.
Signed-off-by: Paul Cercueil <paul.cercueil@xxxxxxxxxx>
Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
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()
---
.../devicetree/bindings/iio/dac/ad5592r.txt | 143 +++++
drivers/iio/dac/Kconfig | 27 +
drivers/iio/dac/Makefile | 3 +
drivers/iio/dac/ad5592r-base.c | 702 +++++++++++++++++++++
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, 1264 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..07e3fc1
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/dac/ad5592r.txt
@@ -0,0 +1,143 @@
+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)
+ * 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.
+
+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>;
+ compatible = "adi,ad5592r";
+ reg = <0>;
+ spi-max-frequency = <1000000>;
+ spi-cpol;
+
+ vref-supply = <&vref>; /* optional */
+ reset-gpios = <&gpio0 86 0>; /* optional */
+
+ 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>;
+ compatible = "adi,ad5593r";
+ reg = <0x10>;
+ 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..8c78ece 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
+ depends on OF
+ 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
+ depends on OF
+ 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..88bdd51
--- /dev/null
+++ b/drivers/iio/dac/ad5592r-base.c
@@ -0,0 +1,702 @@
+/*
+ * 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"
+
+#ifdef CONFIG_GPIOLIB
+
+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;
+ }
+
+ if (offset >= chip->ngpio)
+ return -EINVAL;
+
+ 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);
+}
+#else
+static int ad5592r_gpio_init(struct ad5592r_state *st) { return 0 };
+static void ad5592r_gpio_cleanup(struct ad5592r_state *st) { };
+#endif /* CONFIG_GPIOLIB */
+
+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);
+ 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;
+
+ 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;
+#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 */
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
