diff --git a/drivers/iio/counter/104-quad-8.c b/drivers/iio/counter/104-quad-8.c
index 4be85ec54af4..7d605d783051 100644
--- a/drivers/iio/counter/104-quad-8.c
+++ b/drivers/iio/counter/104-quad-8.c
@@ -59,6 +59,39 @@ struct quad8_iio {
 	unsigned int base;
 };
 
+#define REG_CHANNEL_OPERATION 0x11
+#define REG_INDEX_INPUT_LEVELS 0x16
+/* Borrow Toggle flip-flop */
+#define FLAG_BT BIT(0)
+/* Carry Toggle flip-flop */
+#define FLAG_CT BIT(1)
+/* Error flag */
+#define FLAG_E BIT(4)
+/* Up/Down flag */
+#define FLAG_UD BIT(5)
+/* Reset and Load Signal Decoders */
+#define CTR_RLD 0x00
+/* Counter Mode Register */
+#define CTR_CMR 0x20
+/* Input / Output Control Register */
+#define CTR_IOR 0x40
+/* Index Control Register */
+#define CTR_IDR 0x60
+/* Reset Byte Pointer (three byte data pointer) */
+#define RLD_RESET_BP 0x01
+/* Reset Counter */
+#define RLD_RESET_CNTR 0x02
+/* Reset Borrow Toggle, Carry Toggle, Compare Toggle, and Sign flags */
+#define RLD_RESET_FLAGS 0x04
+/* Reset Error flag */
+#define RLD_RESET_E 0x06
+/* Preset Register to Counter */
+#define RLD_PRESET_CNTR 0x08
+/* Transfer Counter to Output Latch */
+#define RLD_CNTR_OUT 0x10
+#define CHAN_OP_ENABLE_COUNTERS 0x00
+#define CHAN_OP_RESET_COUNTERS 0x01
+
 static int quad8_read_raw(struct iio_dev *indio_dev,
 	struct iio_chan_spec const *chan, int *val, int *val2, long mask)
 {
@@ -72,19 +105,20 @@ static int quad8_read_raw(struct iio_dev *indio_dev,
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		if (chan->type == IIO_INDEX) {
-			*val = !!(inb(priv->base + 0x16) & BIT(chan->channel));
+			*val = !!(inb(priv->base + REG_INDEX_INPUT_LEVELS)
+				& BIT(chan->channel));
 			return IIO_VAL_INT;
 		}
 
 		flags = inb(base_offset + 1);
-		borrow = flags & BIT(0);
-		carry = !!(flags & BIT(1));
+		borrow = flags & FLAG_BT;
+		carry = !!(flags & FLAG_CT);
 
 		/* Borrow XOR Carry effectively doubles count range */
 		*val = (borrow ^ carry) << 24;
 
 		/* Reset Byte Pointer; transfer Counter to Output Latch */
-		outb(0x11, base_offset + 1);
+		outb(CTR_RLD | RLD_RESET_BP | RLD_CNTR_OUT, base_offset + 1);
 
 		for (i = 0; i < 3; i++)
 			*val |= (unsigned int)inb(base_offset) << (8 * i);
@@ -120,17 +154,17 @@ static int quad8_write_raw(struct iio_dev *indio_dev,
 			return -EINVAL;
 
 		/* Reset Byte Pointer */
-		outb(0x01, base_offset + 1);
+		outb(CTR_RLD | RLD_RESET_BP, base_offset + 1);
 
 		/* Counter can only be set via Preset Register */
 		for (i = 0; i < 3; i++)
 			outb(val >> (8 * i), base_offset);
 
 		/* Transfer Preset Register to Counter */
-		outb(0x08, base_offset + 1);
+		outb(CTR_RLD | RLD_PRESET_CNTR, base_offset + 1);
 
 		/* Reset Byte Pointer */
-		outb(0x01, base_offset + 1);
+		outb(CTR_RLD | RLD_RESET_BP, base_offset + 1);
 
 		/* Set Preset Register back to original value */
 		val = priv->preset[chan->channel];
@@ -138,9 +172,9 @@ static int quad8_write_raw(struct iio_dev *indio_dev,
 			outb(val >> (8 * i), base_offset);
 
 		/* Reset Borrow, Carry, Compare, and Sign flags */
-		outb(0x04, base_offset + 1);
+		outb(CTR_RLD | RLD_RESET_FLAGS, base_offset + 1);
 		/* Reset Error flag */
-		outb(0x06, base_offset + 1);
+		outb(CTR_RLD | RLD_RESET_E, base_offset + 1);
 
 		return 0;
 	case IIO_CHAN_INFO_ENABLE:
@@ -153,7 +187,7 @@ static int quad8_write_raw(struct iio_dev *indio_dev,
 		ior_cfg = val | priv->preset_enable[chan->channel] << 1;
 
 		/* Load I/O control configuration */
-		outb(0x40 | ior_cfg, base_offset + 1);
+		outb(CTR_IOR | ior_cfg, base_offset + 1);
 
 		return 0;
 	case IIO_CHAN_INFO_SCALE:
@@ -217,7 +251,7 @@ static ssize_t quad8_write_preset(struct iio_dev *indio_dev, uintptr_t private,
 	priv->preset[chan->channel] = preset;
 
 	/* Reset Byte Pointer */
-	outb(0x01, base_offset + 1);
+	outb(CTR_RLD | RLD_RESET_BP, base_offset + 1);
 
 	/* Set Preset Register */
 	for (i = 0; i < 3; i++)
@@ -258,7 +292,7 @@ static ssize_t quad8_write_set_to_preset_on_index(struct iio_dev *indio_dev,
 		(unsigned int)preset_enable << 1;
 
 	/* Load I/O control configuration to Input / Output Control Register */
-	outb(0x40 | ior_cfg, base_offset);
+	outb(CTR_IOR | ior_cfg, base_offset);
 
 	return len;
 }
@@ -274,7 +308,7 @@ static int quad8_get_noise_error(struct iio_dev *indio_dev,
 	struct quad8_iio *const priv = iio_priv(indio_dev);
 	const int base_offset = priv->base + 2 * chan->channel + 1;
 
-	return !!(inb(base_offset) & BIT(4));
+	return !!(inb(base_offset) & FLAG_E);
 }
 
 static const struct iio_enum quad8_noise_error_enum = {
@@ -294,7 +328,7 @@ static int quad8_get_count_direction(struct iio_dev *indio_dev,
 	struct quad8_iio *const priv = iio_priv(indio_dev);
 	const int base_offset = priv->base + 2 * chan->channel + 1;
 
-	return !!(inb(base_offset) & BIT(5));
+	return !!(inb(base_offset) & FLAG_UD);
 }
 
 static const struct iio_enum quad8_count_direction_enum = {
@@ -324,7 +358,7 @@ static int quad8_set_count_mode(struct iio_dev *indio_dev,
 		mode_cfg |= (priv->quadrature_scale[chan->channel] + 1) << 3;
 
 	/* Load mode configuration to Counter Mode Register */
-	outb(0x20 | mode_cfg, base_offset);
+	outb(CTR_CMR | mode_cfg, base_offset);
 
 	return 0;
 }
@@ -364,7 +398,7 @@ static int quad8_set_synchronous_mode(struct iio_dev *indio_dev,
 	priv->synchronous_mode[chan->channel] = synchronous_mode;
 
 	/* Load Index Control configuration to Index Control Register */
-	outb(0x60 | idr_cfg, base_offset);
+	outb(CTR_IDR | idr_cfg, base_offset);
 
 	return 0;
 }
@@ -410,7 +444,7 @@ static int quad8_set_quadrature_mode(struct iio_dev *indio_dev,
 	priv->quadrature_mode[chan->channel] = quadrature_mode;
 
 	/* Load mode configuration to Counter Mode Register */
-	outb(0x20 | mode_cfg, base_offset);
+	outb(CTR_CMR | mode_cfg, base_offset);
 
 	return 0;
 }
@@ -446,7 +480,7 @@ static int quad8_set_index_polarity(struct iio_dev *indio_dev,
 	priv->index_polarity[chan->channel] = index_polarity;
 
 	/* Load Index Control configuration to Index Control Register */
-	outb(0x60 | idr_cfg, base_offset);
+	outb(CTR_IDR | idr_cfg, base_offset);
 
 	return 0;
 }
@@ -556,28 +590,28 @@ static int quad8_probe(struct device *dev, unsigned int id)
 	priv->base = base[id];
 
 	/* Reset all counters and disable interrupt function */
-	outb(0x01, base[id] + 0x11);
+	outb(CHAN_OP_RESET_COUNTERS, base[id] + REG_CHANNEL_OPERATION);
 	/* Set initial configuration for all counters */
 	for (i = 0; i < QUAD8_NUM_COUNTERS; i++) {
 		base_offset = base[id] + 2 * i;
 		/* Reset Byte Pointer */
-		outb(0x01, base_offset + 1);
+		outb(CTR_RLD | RLD_RESET_BP, base_offset + 1);
 		/* Reset Preset Register */
 		for (j = 0; j < 3; j++)
 			outb(0x00, base_offset);
 		/* Reset Borrow, Carry, Compare, and Sign flags */
-		outb(0x04, base_offset + 1);
+		outb(CTR_RLD | RLD_RESET_FLAGS, base_offset + 1);
 		/* Reset Error flag */
-		outb(0x06, base_offset + 1);
+		outb(CTR_RLD | RLD_RESET_E, base_offset + 1);
 		/* Binary encoding; Normal count; non-quadrature mode */
-		outb(0x20, base_offset + 1);
+		outb(CTR_CMR, base_offset + 1);
 		/* Disable A and B inputs; preset on index; FLG1 as Carry */
-		outb(0x40, base_offset + 1);
+		outb(CTR_IOR, base_offset + 1);
 		/* Disable index function; negative index polarity */
-		outb(0x60, base_offset + 1);
+		outb(CTR_IDR, base_offset + 1);
 	}
 	/* Enable all counters */
-	outb(0x00, base[id] + 0x11);
+	outb(CHAN_OP_ENABLE_COUNTERS, base[id] + REG_CHANNEL_OPERATION);
 
 	return devm_iio_device_register(dev, indio_dev);
 }
