iio: dac: ad5686: add helpers to handle powerdown masks

Add ad5686_pd_field_set() and ad5686_pd_field_get() helpers to cleanup
powerdown mask control. Define AD5686_PD_* constants, e.g. AD5686_PD_MSK
to hold powerdown mask value for a single channel. AD5686_LDAC_PWRDN_*
macros are replaced by AD5686_PD_MODE_*, because they are unused and the
LDAC feature for async load of DAC channel values is not related to power
down control.

Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Author: rodrigo455

drivers/iio/dac/ad5686.c

@@ -33,28 +33,40 @@ static inline unsigned int ad5686_pd_mask_shift(const struct iio_chan_spec *chan
 	return __ffs(chan->address) * 2;
 }
 
+static inline void ad5686_pd_field_set(const struct iio_chan_spec *chan,
+				       unsigned int *pd, unsigned int val)
+{
+	unsigned int shift = ad5686_pd_mask_shift(chan);
+
+	*pd = (*pd & ~(AD5686_PD_MSK << shift)) | ((val & AD5686_PD_MSK) << shift);
+}
+
+static inline unsigned int ad5686_pd_field_get(const struct iio_chan_spec *chan,
+					       unsigned int pd)
+{
+	unsigned int shift = ad5686_pd_mask_shift(chan);
+
+	return (pd >> shift) & AD5686_PD_MSK;
+}
+
 static int ad5686_get_powerdown_mode(struct iio_dev *indio_dev,
 				     const struct iio_chan_spec *chan)
 {
-	unsigned int shift = ad5686_pd_mask_shift(chan);
 	struct ad5686_state *st = iio_priv(indio_dev);
 
 	guard(mutex)(&st->lock);
 
-	return ((st->pwr_down_mode >> shift) & 0x3U) - 1;
+	return ad5686_pd_field_get(chan, st->pwr_down_mode) - 1;
 }
 
 static int ad5686_set_powerdown_mode(struct iio_dev *indio_dev,
 				     const struct iio_chan_spec *chan,
 				     unsigned int mode)
 {
-	unsigned int shift = ad5686_pd_mask_shift(chan);
 	struct ad5686_state *st = iio_priv(indio_dev);
 
 	guard(mutex)(&st->lock);
-
-	st->pwr_down_mode &= ~(0x3U << shift);
-	st->pwr_down_mode |= (mode + 1) << shift;
+	ad5686_pd_field_set(chan, &st->pwr_down_mode, mode + 1);
 
 	return 0;
 }
@@ -69,12 +81,12 @@ static const struct iio_enum ad5686_powerdown_mode_enum = {
 static ssize_t ad5686_read_dac_powerdown(struct iio_dev *indio_dev,
 		uintptr_t private, const struct iio_chan_spec *chan, char *buf)
 {
-	unsigned int shift = ad5686_pd_mask_shift(chan);
 	struct ad5686_state *st = iio_priv(indio_dev);
 
 	guard(mutex)(&st->lock);
 
-	return sysfs_emit(buf, "%d\n", !!(st->pwr_down_mask & (0x3U << shift)));
+	return sysfs_emit(buf, "%d\n",
+			  !!ad5686_pd_field_get(chan, st->pwr_down_mask));
 }
 
 static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
@@ -96,9 +108,9 @@ static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
 	guard(mutex)(&st->lock);
 
 	if (readin)
-		st->pwr_down_mask |= 0x3U << ad5686_pd_mask_shift(chan);
+		ad5686_pd_field_set(chan, &st->pwr_down_mask, AD5686_PD_MSK_PWR_DOWN);
 	else
-		st->pwr_down_mask &= ~(0x3U << ad5686_pd_mask_shift(chan));
+		ad5686_pd_field_set(chan, &st->pwr_down_mask, AD5686_PD_MSK_PWR_UP);
 
 	switch (st->chip_info->regmap_type) {
 	case AD5310_REGMAP:
@@ -471,10 +483,10 @@ int ad5686_probe(struct device *dev,
 
 	/* Set all the power down mode for all channels to 1K pulldown */
 	for (i = 0; i < st->chip_info->num_channels; i++) {
-		shift = ad5686_pd_mask_shift(&st->chip_info->channels[i]);
-		st->pwr_down_mask &= ~(0x3U << shift); /* powered up state */
-		st->pwr_down_mode &= ~(0x3U << shift);
-		st->pwr_down_mode |= 0x01U << shift;
+		ad5686_pd_field_set(&st->chip_info->channels[i],
+				    &st->pwr_down_mask, AD5686_PD_MSK_PWR_UP);
+		ad5686_pd_field_set(&st->chip_info->channels[i],
+				    &st->pwr_down_mode, AD5686_PD_MODE_1K_TO_GND);
 	}
 
 	indio_dev->name = name;

drivers/iio/dac/ad5686.h

@@ -35,18 +35,21 @@
 #define AD5686_CMD_DAISY_CHAIN_ENABLE		0x8
 #define AD5686_CMD_READBACK_ENABLE		0x9
 
-#define AD5686_LDAC_PWRDN_NONE			0x0
-#define AD5686_LDAC_PWRDN_1K			0x1
-#define AD5686_LDAC_PWRDN_100K			0x2
-#define AD5686_LDAC_PWRDN_3STATE		0x3
-
 #define AD5686_CMD_CONTROL_REG			0x4
 #define AD5686_CMD_READBACK_ENABLE_V2		0x5
 
 #define AD5310_REF_BIT_MSK			BIT(8)
 #define AD5683_REF_BIT_MSK			BIT(12)
 #define AD5686_REF_BIT_MSK			BIT(0)
 
+#define AD5686_PD_MSK				GENMASK(1, 0)
+
+#define AD5686_PD_MODE_1K_TO_GND		0x1
+#define AD5686_PD_MODE_100K_TO_GND		0x2
+#define AD5686_PD_MODE_THREE_STATE		0x3
+
+#define AD5686_PD_MSK_PWR_UP			0x0
+#define AD5686_PD_MSK_PWR_DOWN			0x3
 
 enum ad5686_regmap_type {
 	AD5310_REGMAP,