iio: humidity: hts221: refactor write_with_mask code

Move bit-shift in hts221_write_with_mask() instead of coding
the shift depth in the configured value. That change will be necessary
to fix an issue in device power-down procedure.
Simplify hts221_avg_list table management
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/humidity/hts221.h

@@ -30,12 +30,6 @@ struct hts221_transfer_function {
 	int (*write)(struct device *dev, u8 addr, int len, u8 *data);
 };
 
-#define HTS221_AVG_DEPTH	8
-struct hts221_avg_avl {
-	u16 avg;
-	u8 val;
-};
-
 enum hts221_sensor_type {
 	HTS221_SENSOR_H,
 	HTS221_SENSOR_T,

drivers/iio/humidity/hts221_core.c

@@ -32,30 +32,12 @@
 #define HTS221_HUMIDITY_AVG_MASK	0x07
 #define HTS221_TEMP_AVG_MASK		0x38
 
-#define HTS221_ODR_MASK			0x87
+#define HTS221_ODR_MASK			0x03
 #define HTS221_BDU_MASK			BIT(2)
+#define HTS221_ENABLE_MASK		BIT(7)
 
 #define HTS221_DRDY_MASK		BIT(2)
 
-#define HTS221_ENABLE_SENSOR		BIT(7)
-
-#define HTS221_HUMIDITY_AVG_4		0x00 /* 0.4 %RH */
-#define HTS221_HUMIDITY_AVG_8		0x01 /* 0.3 %RH */
-#define HTS221_HUMIDITY_AVG_16		0x02 /* 0.2 %RH */
-#define HTS221_HUMIDITY_AVG_32		0x03 /* 0.15 %RH */
-#define HTS221_HUMIDITY_AVG_64		0x04 /* 0.1 %RH */
-#define HTS221_HUMIDITY_AVG_128		0x05 /* 0.07 %RH */
-#define HTS221_HUMIDITY_AVG_256		0x06 /* 0.05 %RH */
-#define HTS221_HUMIDITY_AVG_512		0x07 /* 0.03 %RH */
-
-#define HTS221_TEMP_AVG_2		0x00 /* 0.08 degC */
-#define HTS221_TEMP_AVG_4		0x08 /* 0.05 degC */
-#define HTS221_TEMP_AVG_8		0x10 /* 0.04 degC */
-#define HTS221_TEMP_AVG_16		0x18 /* 0.03 degC */
-#define HTS221_TEMP_AVG_32		0x20 /* 0.02 degC */
-#define HTS221_TEMP_AVG_64		0x28 /* 0.015 degC */
-#define HTS221_TEMP_AVG_128		0x30 /* 0.01 degC */
-#define HTS221_TEMP_AVG_256		0x38 /* 0.007 degC */
 
 /* calibration registers */
 #define HTS221_REG_0RH_CAL_X_H		0x36
@@ -73,10 +55,11 @@ struct hts221_odr {
 	u8 val;
 };
 
+#define HTS221_AVG_DEPTH		8
 struct hts221_avg {
 	u8 addr;
 	u8 mask;
-	struct hts221_avg_avl avg_avl[HTS221_AVG_DEPTH];
+	u16 avg_avl[HTS221_AVG_DEPTH];
 };
 
 static const struct hts221_odr hts221_odr_table[] = {
@@ -90,28 +73,28 @@ static const struct hts221_avg hts221_avg_list[] = {
 		.addr = HTS221_REG_AVG_ADDR,
 		.mask = HTS221_HUMIDITY_AVG_MASK,
 		.avg_avl = {
-			{ 4, HTS221_HUMIDITY_AVG_4 },
-			{ 8, HTS221_HUMIDITY_AVG_8 },
-			{ 16, HTS221_HUMIDITY_AVG_16 },
-			{ 32, HTS221_HUMIDITY_AVG_32 },
-			{ 64, HTS221_HUMIDITY_AVG_64 },
-			{ 128, HTS221_HUMIDITY_AVG_128 },
-			{ 256, HTS221_HUMIDITY_AVG_256 },
-			{ 512, HTS221_HUMIDITY_AVG_512 },
+			4, /* 0.4 %RH */
+			8, /* 0.3 %RH */
+			16, /* 0.2 %RH */
+			32, /* 0.15 %RH */
+			64, /* 0.1 %RH */
+			128, /* 0.07 %RH */
+			256, /* 0.05 %RH */
+			512, /* 0.03 %RH */
 		},
 	},
 	{
 		.addr = HTS221_REG_AVG_ADDR,
 		.mask = HTS221_TEMP_AVG_MASK,
 		.avg_avl = {
-			{ 2, HTS221_TEMP_AVG_2 },
-			{ 4, HTS221_TEMP_AVG_4 },
-			{ 8, HTS221_TEMP_AVG_8 },
-			{ 16, HTS221_TEMP_AVG_16 },
-			{ 32, HTS221_TEMP_AVG_32 },
-			{ 64, HTS221_TEMP_AVG_64 },
-			{ 128, HTS221_TEMP_AVG_128 },
-			{ 256, HTS221_TEMP_AVG_256 },
+			2, /* 0.08 degC */
+			4, /* 0.05 degC */
+			8, /* 0.04 degC */
+			16, /* 0.03 degC */
+			32, /* 0.02 degC */
+			64, /* 0.015 degC */
+			128, /* 0.01 degC */
+			256, /* 0.007 degC */
 		},
 	},
 };
@@ -166,7 +149,7 @@ static int hts221_write_with_mask(struct hts221_hw *hw, u8 addr, u8 mask,
 		goto unlock;
 	}
 
-	data = (data & ~mask) | (val & mask);
+	data = (data & ~mask) | ((val << __ffs(mask)) & mask);
 
 	err = hw->tf->write(hw->dev, addr, sizeof(data), &data);
 	if (err < 0)
@@ -201,11 +184,10 @@ static int hts221_check_whoami(struct hts221_hw *hw)
 
 int hts221_config_drdy(struct hts221_hw *hw, bool enable)
 {
-	u8 val = enable ? BIT(2) : 0;
 	int err;
 
 	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL3_ADDR,
-				     HTS221_DRDY_MASK, val);
+				     HTS221_DRDY_MASK, enable);
 
 	return err < 0 ? err : 0;
 }
@@ -213,7 +195,6 @@ int hts221_config_drdy(struct hts221_hw *hw, bool enable)
 static int hts221_update_odr(struct hts221_hw *hw, u8 odr)
 {
 	int i, err;
-	u8 val;
 
 	for (i = 0; i < ARRAY_SIZE(hts221_odr_table); i++)
 		if (hts221_odr_table[i].hz == odr)
@@ -222,9 +203,19 @@ static int hts221_update_odr(struct hts221_hw *hw, u8 odr)
 	if (i == ARRAY_SIZE(hts221_odr_table))
 		return -EINVAL;
 
-	val = HTS221_ENABLE_SENSOR | HTS221_BDU_MASK | hts221_odr_table[i].val;
+	/* enable Block Data Update */
+	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
+				     HTS221_BDU_MASK, 1);
+	if (err < 0)
+		return err;
+
+	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
+				     HTS221_ODR_MASK, hts221_odr_table[i].val);
+	if (err < 0)
+		return err;
+
 	err = hts221_write_with_mask(hw, HTS221_REG_CNTRL1_ADDR,
-				     HTS221_ODR_MASK, val);
+				     HTS221_ENABLE_MASK, 1);
 	if (err < 0)
 		return err;
 
@@ -241,14 +232,13 @@ static int hts221_update_avg(struct hts221_hw *hw,
 	const struct hts221_avg *avg = &hts221_avg_list[type];
 
 	for (i = 0; i < HTS221_AVG_DEPTH; i++)
-		if (avg->avg_avl[i].avg == val)
+		if (avg->avg_avl[i] == val)
 			break;
 
 	if (i == HTS221_AVG_DEPTH)
 		return -EINVAL;
 
-	err = hts221_write_with_mask(hw, avg->addr, avg->mask,
-				     avg->avg_avl[i].val);
+	err = hts221_write_with_mask(hw, avg->addr, avg->mask, i);
 	if (err < 0)
 		return err;
 
@@ -283,7 +273,7 @@ hts221_sysfs_rh_oversampling_avail(struct device *dev,
 
 	for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
-				 avg->avg_avl[i].avg);
+				 avg->avg_avl[i]);
 	buf[len - 1] = '\n';
 
 	return len;
@@ -300,7 +290,7 @@ hts221_sysfs_temp_oversampling_avail(struct device *dev,
 
 	for (i = 0; i < ARRAY_SIZE(avg->avg_avl); i++)
 		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ",
-				 avg->avg_avl[i].avg);
+				 avg->avg_avl[i]);
 	buf[len - 1] = '\n';
 
 	return len;
@@ -534,13 +524,13 @@ static int hts221_read_raw(struct iio_dev *iio_dev,
 		case IIO_HUMIDITYRELATIVE:
 			avg = &hts221_avg_list[HTS221_SENSOR_H];
 			idx = hw->sensors[HTS221_SENSOR_H].cur_avg_idx;
-			*val = avg->avg_avl[idx].avg;
+			*val = avg->avg_avl[idx];
 			ret = IIO_VAL_INT;
 			break;
 		case IIO_TEMP:
 			avg = &hts221_avg_list[HTS221_SENSOR_T];
 			idx = hw->sensors[HTS221_SENSOR_T].cur_avg_idx;
-			*val = avg->avg_avl[idx].avg;
+			*val = avg->avg_avl[idx];
 			ret = IIO_VAL_INT;
 			break;
 		default:
@@ -661,7 +651,7 @@ int hts221_probe(struct iio_dev *iio_dev)
 		return err;
 	}
 
-	data = hts221_avg_list[HTS221_SENSOR_H].avg_avl[3].avg;
+	data = hts221_avg_list[HTS221_SENSOR_H].avg_avl[3];
 	err = hts221_update_avg(hw, HTS221_SENSOR_H, data);
 	if (err < 0) {
 		dev_err(hw->dev, "failed to set rh oversampling ratio\n");
@@ -676,7 +666,7 @@ int hts221_probe(struct iio_dev *iio_dev)
 		return err;
 	}
 
-	data = hts221_avg_list[HTS221_SENSOR_T].avg_avl[3].avg;
+	data = hts221_avg_list[HTS221_SENSOR_T].avg_avl[3];
 	err = hts221_update_avg(hw, HTS221_SENSOR_T, data);
 	if (err < 0) {
 		dev_err(hw->dev,