hwmon: (pmbus) Replace EINVAL return codes with more appropriate errors

EINVAL was over-used in the code. Replace it with more appropriate errors.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>

drivers/hwmon/pmbus/lm25066.c

@@ -57,7 +57,7 @@ static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
 	int ret;
 
 	if (page > 1)
-		return -EINVAL;
+		return -ENXIO;
 
 	/* Map READ_VAUX into READ_VOUT register on page 1 */
 	if (page == 1) {
@@ -85,7 +85,7 @@ static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
 			break;
 		default:
 			/* No other valid registers on page 1 */
-			ret = -EINVAL;
+			ret = -ENXIO;
 			break;
 		}
 		goto done;
@@ -138,7 +138,7 @@ static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
 	int ret;
 
 	if (page > 1)
-		return -EINVAL;
+		return -ENXIO;
 
 	switch (reg) {
 	case PMBUS_IIN_OC_WARN_LIMIT:
@@ -164,7 +164,7 @@ static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
 static int lm25066_write_byte(struct i2c_client *client, int page, u8 value)
 {
 	if (page > 1)
-		return -EINVAL;
+		return -ENXIO;
 
 	if (page == 0)
 		return pmbus_write_byte(client, 0, value);

drivers/hwmon/pmbus/max8688.c

@@ -45,7 +45,7 @@ static int max8688_read_word_data(struct i2c_client *client, int page, int reg)
 	int ret;
 
 	if (page)
-		return -EINVAL;
+		return -ENXIO;
 
 	switch (reg) {
 	case PMBUS_VIRT_READ_VOUT_MAX:
@@ -102,7 +102,7 @@ static int max8688_read_byte_data(struct i2c_client *client, int page, int reg)
 	int mfg_status;
 
 	if (page)
-		return -EINVAL;
+		return -ENXIO;
 
 	switch (reg) {
 	case PMBUS_STATUS_VOUT:

drivers/hwmon/pmbus/pmbus_core.c

@@ -160,7 +160,7 @@ int pmbus_set_page(struct i2c_client *client, u8 page)
 		rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
 		newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
 		if (newpage != page)
-			rv = -EINVAL;
+			rv = -EIO;
 		else
 			data->currpage = page;
 	}
@@ -229,7 +229,7 @@ static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
 			return status;
 	}
 	if (reg >= PMBUS_VIRT_BASE)
-		return -EINVAL;
+		return -ENXIO;
 	return pmbus_write_word_data(client, page, reg, word);
 }
 
@@ -261,7 +261,7 @@ static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
 			return status;
 	}
 	if (reg >= PMBUS_VIRT_BASE)
-		return -EINVAL;
+		return -ENXIO;
 	return pmbus_read_word_data(client, page, reg);
 }
 
@@ -320,7 +320,7 @@ static int pmbus_check_status_cml(struct i2c_client *client)
 	if (status < 0 || (status & PB_STATUS_CML)) {
 		status2 = pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
 		if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
-			return -EINVAL;
+			return -EIO;
 	}
 	return 0;
 }
@@ -1682,7 +1682,7 @@ int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
 	if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
 		dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
 			info->pages);
-		ret = -EINVAL;
+		ret = -ENODEV;
 		goto out_data;
 	}
 

drivers/hwmon/pmbus/ucd9000.c

@@ -75,7 +75,7 @@ static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
 	switch (reg) {
 	case PMBUS_FAN_CONFIG_12:
 		if (page)
-			return -EINVAL;
+			return -ENXIO;
 
 		ret = ucd9000_get_fan_config(client, 0);
 		if (ret < 0)
@@ -89,7 +89,7 @@ static int ucd9000_read_byte_data(struct i2c_client *client, int page, int reg)
 		break;
 	case PMBUS_FAN_CONFIG_34:
 		if (page)
-			return -EINVAL;
+			return -ENXIO;
 
 		ret = ucd9000_get_fan_config(client, 2);
 		if (ret < 0)