hwmon: (it87) Introduce feature flag to reflect internal in7 sensor

On some chips, in7 is always an internal voltage sensor. Introduce
feature flag to reflect this condition to simplify adding support
for new chips.
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/it87.c

@@ -258,6 +258,7 @@ struct it87_devices {
 #define FEAT_FAN16_CONFIG	(1 << 7)	/* Need to enable 16-bit fans */
 #define FEAT_FIVE_FANS		(1 << 8)	/* Supports five fans */
 #define FEAT_VID		(1 << 9)	/* Set if chip supports VID */
+#define FEAT_IN7_INTERNAL	(1 << 10)	/* Set if in7 is internal */
 
 static const struct it87_devices it87_devices[] = {
 	[it87] = {
@@ -296,7 +297,7 @@ static const struct it87_devices it87_devices[] = {
 		.suffix = "F",
 		.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
 		  | FEAT_TEMP_OFFSET | FEAT_TEMP_OLD_PECI | FEAT_TEMP_PECI
-		  | FEAT_FAN16_CONFIG | FEAT_FIVE_FANS,
+		  | FEAT_FAN16_CONFIG | FEAT_FIVE_FANS | FEAT_IN7_INTERNAL,
 		.peci_mask = 0x05,
 		.old_peci_mask = 0x02,	/* Actually reports PCH */
 	},
@@ -304,14 +305,15 @@ static const struct it87_devices it87_devices[] = {
 		.name = "it8728",
 		.suffix = "F",
 		.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
-		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_FIVE_FANS,
+		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_FIVE_FANS
+		  | FEAT_IN7_INTERNAL,
 		.peci_mask = 0x07,
 	},
 	[it8771] = {
 		.name = "it8771",
 		.suffix = "E",
 		.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
-		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI,
+		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL,
 				/* PECI: guesswork */
 				/* 12mV ADC (OHM) */
 				/* 16 bit fans (OHM) */
@@ -322,7 +324,7 @@ static const struct it87_devices it87_devices[] = {
 		.name = "it8772",
 		.suffix = "E",
 		.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
-		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI,
+		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL,
 				/* PECI (coreboot) */
 				/* 12mV ADC (HWSensors4, OHM) */
 				/* 16 bit fans (HWSensors4, OHM) */
@@ -354,14 +356,14 @@ static const struct it87_devices it87_devices[] = {
 		.name = "it8786",
 		.suffix = "E",
 		.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
-		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI,
+		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL,
 		.peci_mask = 0x07,
 	},
 	[it8603] = {
 		.name = "it8603",
 		.suffix = "E",
 		.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
-		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI,
+		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL,
 		.peci_mask = 0x07,
 	},
 };
@@ -379,6 +381,7 @@ static const struct it87_devices it87_devices[] = {
 #define has_fan16_config(data)	((data)->features & FEAT_FAN16_CONFIG)
 #define has_five_fans(data)	((data)->features & FEAT_FIVE_FANS)
 #define has_vid(data)		((data)->features & FEAT_VID)
+#define has_in7_internal(data)	((data)->features & FEAT_IN7_INTERNAL)
 
 struct it87_sio_data {
 	enum chips type;
@@ -1860,8 +1863,13 @@ static int __init it87_find(unsigned short *address,
 		it87_devices[sio_data->type].suffix,
 		*address, sio_data->revision);
 
+	/* in7 (VSB or VCCH5V) is always internal on some chips */
+	if (it87_devices[sio_data->type].features & FEAT_IN7_INTERNAL)
+		sio_data->internal |= (1 << 1);
+
 	/* in8 (Vbat) is always internal */
-	sio_data->internal = (1 << 2);
+	sio_data->internal |= (1 << 2);
+
 	/* Only the IT8603E has in9 */
 	if (sio_data->type != it8603)
 		sio_data->skip_in |= (1 << 9);
@@ -1962,7 +1970,6 @@ static int __init it87_find(unsigned short *address,
 		sio_data->skip_in |= (1 << 5); /* No VIN5 */
 		sio_data->skip_in |= (1 << 6); /* No VIN6 */
 
-		sio_data->internal |= (1 << 1); /* in7 is VSB */
 		sio_data->internal |= (1 << 3); /* in9 is AVCC */
 
 		sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f;
@@ -2023,9 +2030,7 @@ static int __init it87_find(unsigned short *address,
 		}
 		if (reg & (1 << 0))
 			sio_data->internal |= (1 << 0);
-		if ((reg & (1 << 1)) || sio_data->type == it8721 ||
-		    sio_data->type == it8728 || sio_data->type == it8771 ||
-		    sio_data->type == it8772 || sio_data->type == it8786)
+		if (reg & (1 << 1))
 			sio_data->internal |= (1 << 1);
 
 		/*