hwmon: (pmbus/core) allow drivers to override WRITE_PROTECT

Use _pmbus_read_byte_data() rather than calling smbus directly to check
the write protection status. This give a chance to device implementing
write protection differently to report back on the actual write protection
status.

Signed-off-by: Jerome Brunet <[email protected]>
Message-ID: <[email protected]>
[groeck: Fix page parameter of _pmbus_read_byte_data()]
Signed-off-by: Guenter Roeck <[email protected]>

Author: jbrun3t

drivers/hwmon/pmbus/pmbus_core.c

@@ -2719,9 +2719,7 @@ static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
 	 * limit registers need to be disabled.
 	 */
 	if (!(data->flags & PMBUS_NO_WRITE_PROTECT)) {
-		pmbus_wait(client);
-		ret = i2c_smbus_read_byte_data(client, PMBUS_WRITE_PROTECT);
-		pmbus_update_ts(client, false);
+		ret = _pmbus_read_byte_data(client, -1, PMBUS_WRITE_PROTECT);
 
 		if (ret > 0 && (ret & PB_WP_ANY))
 			data->flags |= PMBUS_WRITE_PROTECTED | PMBUS_SKIP_STATUS_CHECK;