iio:measurement specialties core: Fix endian sparse warnings.

This patch changes various types to the appropriate endian specific
versions.  Also introduces an additional local variable to avoid
a single variable being used for both be and cpu endianness.

These aren't bugs as such, but clearing them up does make the code
clearer.

Warning was:
sparse warnings: (new ones prefixed by >>)

>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:126:9: sparse: cast to restricted __be32
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:126:9: sparse: cast to restricted __be32
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:126:9: sparse: cast to restricted __be32
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:126:9: sparse: cast to restricted __be32
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:126:9: sparse: cast to restricted __be32
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:126:9: sparse: cast to restricted __be32
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:127:16: sparse: cast to restricted __be32
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:127:16: sparse: cast to restricted __be32
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:127:16: sparse: cast to restricted __be32
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:127:16: sparse: cast to restricted __be32
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:127:16: sparse: cast to restricted __be32
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:127:16: sparse: cast to restricted __be32
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:208:18: sparse: incorrect type in assignment (different base types)
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:208:18:    expected unsigned short [unsigned] [addressable] [usertype] send_buf
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:208:18:    got restricted __be16 [usertype] <noident>
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
>> drivers/iio/common/ms_sensors/ms_sensors_i2c.c:216:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:230:18: sparse: incorrect type in assignment (different base types)
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:230:18:    expected unsigned short [unsigned] [addressable] [usertype] send_buf
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:230:18:    got restricted __be16 [usertype] <noident>
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64
   drivers/iio/common/ms_sensors/ms_sensors_i2c.c:239:19: sparse: cast to restricted __be64

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/common/ms_sensors/ms_sensors_i2c.c

@@ -106,7 +106,7 @@ int ms_sensors_convert_and_read(void *cli, u8 conv, u8 rd,
 				unsigned int delay, u32 *adc)
 {
 	int ret;
-	u32 buf = 0;
+        __be32 buf = 0;
 	struct i2c_client *client = (struct i2c_client *)cli;
 
 	/* Trigger conversion */
@@ -186,8 +186,9 @@ static bool ms_sensors_crc_valid(u32 value)
 int ms_sensors_read_serial(struct i2c_client *client, u64 *sn)
 {
 	u8 i;
-	u64 rcv_buf = 0;
-	u16 send_buf;
+	__be64 rcv_buf = 0;
+	u64 rcv_val;
+	__be16 send_buf;
 	int ret;
 
 	struct i2c_msg msg[2] = {
@@ -213,18 +214,18 @@ int ms_sensors_read_serial(struct i2c_client *client, u64 *sn)
 		return ret;
 	}
 
-	rcv_buf = be64_to_cpu(rcv_buf);
-	dev_dbg(&client->dev, "Serial MSB raw : %llx\n", rcv_buf);
+	rcv_val = be64_to_cpu(rcv_buf);
+	dev_dbg(&client->dev, "Serial MSB raw : %llx\n", rcv_val);
 
 	for (i = 0; i < 64; i += 16) {
-		if (!ms_sensors_crc_valid((rcv_buf >> i) & 0xFFFF))
+		if (!ms_sensors_crc_valid((rcv_val >> i) & 0xFFFF))
 			return -ENODEV;
 	}
 
-	*sn = (((rcv_buf >> 32) & 0xFF000000) |
-	       ((rcv_buf >> 24) & 0x00FF0000) |
-	       ((rcv_buf >> 16) & 0x0000FF00) |
-	       ((rcv_buf >> 8) & 0x000000FF)) << 16;
+	*sn = (((rcv_val >> 32) & 0xFF000000) |
+	       ((rcv_val >> 24) & 0x00FF0000) |
+	       ((rcv_val >> 16) & 0x0000FF00) |
+	       ((rcv_val >> 8) & 0x000000FF)) << 16;
 
 	/* Read LSB part of serial number */
 	send_buf = cpu_to_be16(MS_SENSORS_SERIAL_READ_LSB);
@@ -236,15 +237,15 @@ int ms_sensors_read_serial(struct i2c_client *client, u64 *sn)
 		return ret;
 	}
 
-	rcv_buf = be64_to_cpu(rcv_buf) >> 16;
-	dev_dbg(&client->dev, "Serial MSB raw : %llx\n", rcv_buf);
+	rcv_val = be64_to_cpu(rcv_buf) >> 16;
+	dev_dbg(&client->dev, "Serial MSB raw : %llx\n", rcv_val);
 
 	for (i = 0; i < 48; i += 24) {
-		if (!ms_sensors_crc_valid((rcv_buf >> i) & 0xFFFFFF))
+		if (!ms_sensors_crc_valid((rcv_val >> i) & 0xFFFFFF))
 			return -ENODEV;
 	}
 
-	*sn |= (rcv_buf & 0xFFFF00) << 40 | (rcv_buf >> 32);
+	*sn |= (rcv_val & 0xFFFF00) << 40 | (rcv_val >> 32);
 
 	return 0;
 }