2 files changed, 123 insertions, 9 deletions

diff --git a/drivers/staging/iio/adc/ad7793.c b/drivers/staging/iio/adc/ad7793.c
index 843550ddc2ea..ec0fbd43f4ee 100644
--- a/drivers/staging/iio/adc/ad7793.c
+++ b/drivers/staging/iio/adc/ad7793.c
@@ -118,6 +118,12 @@ static int ad7793_setup(struct iio_dev *indio_dev,
         unsigned long long scale_uv;
         u32 id;
 
+        if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 ||
+                pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) &&
+                ((pdata->exitation_current != AD7793_IX_10uA) &&
+                (pdata->exitation_current != AD7793_IX_210uA)))
+                return -EINVAL;
+
         /* reset the serial interface */
         ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
         if (ret < 0)
@@ -136,8 +142,18 @@ static int ad7793_setup(struct iio_dev *indio_dev,
                 goto out;
         }
 
-        st->mode = pdata->mode;
-        st->conf = pdata->conf;
+        st->mode = AD7793_MODE_RATE(1);
+        st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src);
+        st->conf = AD7793_CONF_REFSEL(pdata->refsel);
+        st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage);
+        if (pdata->buffered)
+                st->conf |= AD7793_CONF_BUF;
+        if (pdata->boost_enable)
+                st->conf |= AD7793_CONF_BOOST;
+        if (pdata->burnout_current)
+                st->conf |= AD7793_CONF_BO_EN;
+        if (pdata->unipolar)
+                st->conf |= AD7793_CONF_UNIPOLAR;
 
         ret = ad7793_set_mode(&st->sd, AD_SD_MODE_IDLE);
         if (ret)
@@ -147,8 +163,9 @@ static int ad7793_setup(struct iio_dev *indio_dev,
         if (ret)
                 goto out;
 
-        ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO,
-                               sizeof(pdata->io), pdata->io);
+        ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1,
+                                   pdata->exitation_current |
+                               (pdata->current_source_direction << 2));
         if (ret)
                 goto out;
 
diff --git a/drivers/staging/iio/adc/ad7793.h b/drivers/staging/iio/adc/ad7793.h
index 8fdd450a2cd9..9e905906da2f 100644
--- a/drivers/staging/iio/adc/ad7793.h
+++ b/drivers/staging/iio/adc/ad7793.h
@@ -68,7 +68,7 @@
 #define AD7793_CONF_UNIPOLAR    (1 << 12) /* Unipolar/Bipolar Enable */
 #define AD7793_CONF_BOOST       (1 << 11) /* Boost Enable */
 #define AD7793_CONF_GAIN(x)     (((x) & 0x7) << 8) /* Gain Select */
-#define AD7793_CONF_REFSEL      (1 << 7) /* INT/EXT Reference Select */
+#define AD7793_CONF_REFSEL(x)   ((x) << 6) /* INT/EXT Reference Select */
 #define AD7793_CONF_BUF         (1 << 4) /* Buffered Mode Enable */
 #define AD7793_CONF_CHAN(x)     ((x) & 0xf) /* Channel select */
 #define AD7793_CONF_CHAN_MASK   0xf /* Channel select mask */
@@ -105,11 +105,108 @@
 #define AD7793_IO_IXCEN_210uA   (2 << 0) /* Excitation Current 210uA */
 #define AD7793_IO_IXCEN_1mA     (3 << 0) /* Excitation Current 1mA */
 
+/**
+ * enum ad7793_clock_source - AD7793 clock source selection
+ * @AD7793_CLK_SRC_INT: Internal 64 kHz clock, not available at the CLK pin.
+ * @AD7793_CLK_SRC_INT_CO: Internal 64 kHz clock, available at the CLK pin.
+ * @AD7793_CLK_SRC_EXT: Use external clock.
+ * @AD7793_CLK_SRC_EXT_DIV2: Use external clock divided by 2.
+ */
+enum ad7793_clock_source {
+        AD7793_CLK_SRC_INT,
+        AD7793_CLK_SRC_INT_CO,
+        AD7793_CLK_SRC_EXT,
+        AD7793_CLK_SRC_EXT_DIV2,
+};
+
+/**
+ * enum ad7793_bias_voltage - AD7793 bias voltage selection
+ * @AD7793_BIAS_VOLTAGE_DISABLED: Bias voltage generator disabled
+ * @AD7793_BIAS_VOLTAGE_AIN1: Bias voltage connected to AIN1(-).
+ * @AD7793_BIAS_VOLTAGE_AIN2: Bias voltage connected to AIN2(-).
+ * @AD7793_BIAS_VOLTAGE_AIN3: Bias voltage connected to AIN3(-).
+ *      Only valid for AD7795/AD7796.
+ */
+enum ad7793_bias_voltage {
+        AD7793_BIAS_VOLTAGE_DISABLED,
+        AD7793_BIAS_VOLTAGE_AIN1,
+        AD7793_BIAS_VOLTAGE_AIN2,
+        AD7793_BIAS_VOLTAGE_AIN3,
+};
+
+/**
+ * enum ad7793_refsel - AD7793 reference voltage selection
+ * @AD7793_REFSEL_REFIN1: External reference applied between REFIN1(+)
+ *      and REFIN1(-).
+ * @AD7793_REFSEL_REFIN2: External reference applied between REFIN2(+) and
+ *      and REFIN1(-). Only valid for AD7795/AD7796.
+ * @AD7793_REFSEL_INTERNAL: Internal 1.17 V reference.
+ */
+enum ad7793_refsel {
+        AD7793_REFSEL_REFIN1 = 0,
+        AD7793_REFSEL_REFIN2 = 1,
+        AD7793_REFSEL_INTERNAL = 2,
+};
+
+/**
+ * enum ad7793_current_source_direction - AD7793 excitation current direction
+ * @AD7793_IEXEC1_IOUT1_IEXEC2_IOUT2: Current source IEXC1 connected to pin
+ *      IOUT1, current source IEXC2 connected to pin IOUT2.
+ * @AD7793_IEXEC1_IOUT2_IEXEC2_IOUT1: Current source IEXC2 connected to pin
+ *      IOUT1, current source IEXC1 connected to pin IOUT2.
+ * @AD7793_IEXEC1_IEXEC2_IOUT1: Both current sources connected to pin IOUT1.
+ *      Only valid when the current sources are set to 10 uA or 210 uA.
+ * @AD7793_IEXEC1_IEXEC2_IOUT2: Both current sources connected to Pin IOUT2.
+ *      Only valid when the current ources are set to 10 uA or 210 uA.
+ */
+enum ad7793_current_source_direction {
+        AD7793_IEXEC1_IOUT1_IEXEC2_IOUT2 = 0,
+        AD7793_IEXEC1_IOUT2_IEXEC2_IOUT1 = 1,
+        AD7793_IEXEC1_IEXEC2_IOUT1 = 2,
+        AD7793_IEXEC1_IEXEC2_IOUT2 = 3,
+};
+
+/**
+ * enum ad7793_excitation_current - AD7793 excitation current selection
+ * @AD7793_IX_DISABLED: Excitation current Disabled.
+ * @AD7793_IX_10uA: Enable 10 micro-ampere excitation current.
+ * @AD7793_IX_210uA: Enable 210 micro-ampere excitation current.
+ * @AD7793_IX_1mA: Enable 1 milli-Ampere excitation current.
+ */
+enum ad7793_excitation_current {
+        AD7793_IX_DISABLED = 0,
+        AD7793_IX_10uA = 1,
+        AD7793_IX_210uA = 2,
+        AD7793_IX_1mA = 3,
+};
+
+/**
+ * struct ad7793_platform_data - AD7793 platform data
+ * @vref_mv: Reference voltage in milli-Volt
+ * @clock_src: Clock source selection
+ * @burnout_current: If set to true the 100nA burnout current is enabled.
+ * @boost_enable: Enable boost for the bias voltage generator.
+ * @buffered: If set to true configure the device for buffered input mode.
+ * @unipolar: If set to true sample in unipolar mode, if set to false sample in
+ *              bipolar mode.
+ * @refsel: Reference voltage selection
+ * @bias_voltage: Bias voltage selection
+ * @exitation_current: Excitation current selection
+ * @current_source_direction: Excitation current direction selection
+ */
 struct ad7793_platform_data {
-        u16                     vref_mv;
-        u16                     mode;
-        u16                     conf;
-        u8                      io;
+        u16 vref_mv;
+
+        enum ad7793_clock_source clock_src;
+        bool burnout_current;
+        bool boost_enable;
+        bool buffered;
+        bool unipolar;
+
+        enum ad7793_refsel refsel;
+        enum ad7793_bias_voltage bias_voltage;
+        enum ad7793_excitation_current exitation_current;
+        enum ad7793_current_source_direction current_source_direction;
 };
 
 #endif /* IIO_ADC_AD7793_H_ */