hwmon: (pmbus/ltc2978) Code cleanup

Use u16 instead of int to store cached limit attributes.
This reduces allocated data size per driver instance by 48 bytes.
Use defines for the number of pages supported by individual chips.
Use ARRAY_SIZE for loops to initialize array variables, and
initialize all variables in the same code block.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/pmbus/ltc2978.c

@@ -49,20 +49,24 @@ enum chips { ltc2978, ltc3880 };
 #define LTC3880_ID			0x4000
 #define LTC3880_ID_MASK			0xff00
 
+#define LTC2978_NUM_PAGES		8
+#define LTC3880_NUM_PAGES		2
+
 /*
  * LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
  * happens pretty much each time chip data is updated. Raw peak data therefore
  * does not provide much value. To be able to provide useful peak data, keep an
  * internal cache of measured peak data, which is only cleared if an explicit
  * "clear peak" command is executed for the sensor in question.
  */
+
 struct ltc2978_data {
 	enum chips id;
-	int vin_min, vin_max;
-	int temp_min, temp_max[2];
-	int vout_min[8], vout_max[8];
-	int iout_max[2];
-	int temp2_max;
+	u16 vin_min, vin_max;
+	u16 temp_min, temp_max[LTC3880_NUM_PAGES];
+	u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
+	u16 iout_max[LTC3880_NUM_PAGES];
+	u16 temp2_max;
 	struct pmbus_driver_info info;
 };
 
@@ -323,6 +327,8 @@ static int ltc2978_probe(struct i2c_client *client,
 
 	data->vin_min = 0x7bff;
 	data->vin_max = 0x7c00;
+	for (i = 0; i < ARRAY_SIZE(data->vout_min); i++)
+		data->vout_min[i] = 0xffff;
 	data->temp_min = 0x7bff;
 	for (i = 0; i < ARRAY_SIZE(data->temp_max); i++)
 		data->temp_max[i] = 0x7c00;
@@ -331,18 +337,18 @@ static int ltc2978_probe(struct i2c_client *client,
 	switch (data->id) {
 	case ltc2978:
 		info->read_word_data = ltc2978_read_word_data;
-		info->pages = 8;
+		info->pages = LTC2978_NUM_PAGES;
 		info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
 		  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
 		  | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
-		for (i = 1; i < 8; i++) {
+		for (i = 1; i < LTC2978_NUM_PAGES; i++) {
 			info->func[i] = PMBUS_HAVE_VOUT
 			  | PMBUS_HAVE_STATUS_VOUT;
 		}
 		break;
 	case ltc3880:
 		info->read_word_data = ltc3880_read_word_data;
-		info->pages = 2;
+		info->pages = LTC3880_NUM_PAGES;
 		info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
 		  | PMBUS_HAVE_STATUS_INPUT
 		  | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
@@ -359,9 +365,6 @@ static int ltc2978_probe(struct i2c_client *client,
 	default:
 		return -ENODEV;
 	}
-	for (i = 0; i < info->pages; i++)
-		data->vout_min[i] = 0xffff;
-
 	return pmbus_do_probe(client, id, info);
 }