[PATCH v3 03/11] hwmon: chipcap2: fix be16 handling

[Javier Carrasco <javier.carrasco.cruz@gmail.com>]

The driver currently only works correctly on little-endian
architectures when writing 16-bit register values.

Use i2c_smbus_write_word_swapped() for writes and get_unaligned_be16()
for reads to correctly handle the ChipCap 2's big-endian data format
on all architectures.

Fixes: 3af350929e75 ("hwmon: Add support for Amphenol ChipCap 2")
Cc: stable@vger.kernel.org
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
---
 drivers/hwmon/chipcap2.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/hwmon/chipcap2.c b/drivers/hwmon/chipcap2.c
index 8102b6851d3d..aec4adf98658 100644
--- a/drivers/hwmon/chipcap2.c
+++ b/drivers/hwmon/chipcap2.c
@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/module.h>
+#include <linux/unaligned.h>
 #include <linux/regulator/consumer.h>
 #include <linux/mod_devicetable.h>
 #include <linux/property.h>
@@ -260,8 +261,7 @@ static int cc2_write_reg(struct cc2_data *data, u8 reg, u16 val)
 	if (ret < 0)
 		goto disable;
 
-	cpu_to_be16s(&val);
-	ret = i2c_smbus_write_word_data(data->client, reg, val);
+	ret = i2c_smbus_write_word_swapped(data->client, reg, val);
 	if (ret < 0)
 		goto disable;
 
@@ -311,7 +311,7 @@ static int cc2_read_reg(struct cc2_data *data, u8 reg, u16 *val)
 	if (ret != CC2_EEPROM_DATA_LEN)
 		return ret < 0 ? ret : -EIO;
 
-	*val = be16_to_cpup((__be16 *)&buf[1]);
+	*val = get_unaligned_be16(&buf[1]);
 
 	return cc2_read_command_status(data->client);
 }
@@ -351,10 +351,10 @@ static int cc2_data_fetch(struct i2c_client *client,
 
 	switch (type) {
 	case hwmon_humidity:
-		*val = cc2_rh_convert(be16_to_cpup((__be16 *)&data[0]));
+		*val = cc2_rh_convert(get_unaligned_be16(&data[0]));
 		break;
 	case hwmon_temp:
-		*val = cc2_temp_convert(be16_to_cpup((__be16 *)&data[2]));
+		*val = cc2_temp_convert(get_unaligned_be16(&data[2]));
 		break;
 	default:
 		return -EINVAL;

-- 
2.43.0