iio: dac: Add support for the AD5592R/AD5593R ADCs/DACs
authorPaul Cercueil <paul.cercueil@analog.com>
Tue, 5 Apr 2016 07:46:19 +0000 (09:46 +0200)
committerJonathan Cameron <jic23@kernel.org>
Sun, 10 Apr 2016 13:29:06 +0000 (14:29 +0100)
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>
Documentation/devicetree/bindings/iio/dac/ad5592r.txt [new file with mode: 0644]
drivers/iio/dac/Kconfig
drivers/iio/dac/Makefile
drivers/iio/dac/ad5592r-base.c [new file with mode: 0644]
drivers/iio/dac/ad5592r-base.h [new file with mode: 0644]
drivers/iio/dac/ad5592r.c [new file with mode: 0644]
drivers/iio/dac/ad5593r.c [new file with mode: 0644]
include/dt-bindings/iio/adi,ad5592r.h [new file with mode: 0644]

diff --git a/Documentation/devicetree/bindings/iio/dac/ad5592r.txt b/Documentation/devicetree/bindings/iio/dac/ad5592r.txt
new file mode 100644 (file)
index 0000000..989f96f
--- /dev/null
@@ -0,0 +1,155 @@
+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, since
+                                       there is no disadvantage this
+                                       this should be considered as the
+                                       preferred DAC mode)
+                               * 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>;
+               };
+       };
index 210db81ca144660a253616d969029efef02026e5..61d5008bff5cbcf80a2161616f9fabf842a995a2 100644 (file)
@@ -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
index 420a15cdaa53cbd081ebf599186b33edce3994fc..8b78d5ca9b11c1d266f946e9ed144546cb9cb4af 100644 (file)
@@ -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 (file)
index 0000000..948f600
--- /dev/null
@@ -0,0 +1,691 @@
+/*
+ * AD5592R Digital <-> Analog converters driver
+ *
+ * Copyright 2014-2016 Analog Devices Inc.
+ * Author: Paul Cercueil <paul.cercueil@analog.com>
+ *
+ * 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);
+
+                       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", &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");
diff --git a/drivers/iio/dac/ad5592r-base.h b/drivers/iio/dac/ad5592r-base.h
new file mode 100644 (file)
index 0000000..841457e
--- /dev/null
@@ -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__ */
diff --git a/drivers/iio/dac/ad5592r.c b/drivers/iio/dac/ad5592r.c
new file mode 100644 (file)
index 0000000..0b235a2
--- /dev/null
@@ -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");
diff --git a/drivers/iio/dac/ad5593r.c b/drivers/iio/dac/ad5593r.c
new file mode 100644 (file)
index 0000000..dca158a
--- /dev/null
@@ -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");
diff --git a/include/dt-bindings/iio/adi,ad5592r.h b/include/dt-bindings/iio/adi,ad5592r.h
new file mode 100644 (file)
index 0000000..c48aca1
--- /dev/null
@@ -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 */