hwmon: (it87) Add support for IT8781F

IT8781F is mostly compatible to IT8782F. Major difference is that it only
supports four instead of six UART channels, and therefore does not share
the uart6 pins.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

2 files changed, 26 insertions, 10 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 110fade9cb74..f5fc54e24fea 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -599,8 +599,8 @@ config SENSORS_IT87
 	help
 	  If you say yes here you get support for ITE IT8705F, IT8712F,
 	  IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8758E,
-	  IT8771E, IT8772E, IT8782F, IT8783E/F and IT8603E sensor chips,
-	  and the SiS950 clone.
+	  IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F and IT8603E
+	  sensor chips, and the SiS950 clone.
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called it87.
diff --git a/drivers/hwmon/it87.c b/drivers/hwmon/it87.c
index 409116c52cc5..ed25e4bab978 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -23,6 +23,7 @@
  *            IT8758E  Super I/O chip w/LPC interface
  *            IT8771E  Super I/O chip w/LPC interface
  *            IT8772E  Super I/O chip w/LPC interface
+ *            IT8781F  Super I/O chip w/LPC interface
  *            IT8782F  Super I/O chip w/LPC interface
  *            IT8783E/F Super I/O chip w/LPC interface
  *            Sis950   A clone of the IT8705F
@@ -66,7 +67,7 @@
 #define DRVNAME "it87"
 
 enum chips { it87, it8712, it8716, it8718, it8720, it8721, it8728, it8771,
-	     it8772, it8782, it8783, it8603 };
+	     it8772, it8781, it8782, it8783, it8603 };
 
 static unsigned short force_id;
 module_param(force_id, ushort, 0);
@@ -146,6 +147,7 @@ static inline void superio_exit(void)
 #define IT8728F_DEVID 0x8728
 #define IT8771E_DEVID 0x8771
 #define IT8772E_DEVID 0x8772
+#define IT8781F_DEVID 0x8781
 #define IT8782F_DEVID 0x8782
 #define IT8783E_DEVID 0x8783
 #define IT8603E_DEVID 0x8603
@@ -307,6 +309,12 @@ static const struct it87_devices it87_devices[] = {
 					/* 16 bit fans (HWSensors4, OHM) */
 		.peci_mask = 0x07,
 	},
+	[it8781] = {
+		.name = "it8781",
+		.features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET
+		  | FEAT_TEMP_OLD_PECI,
+		.old_peci_mask = 0x4,
+	},
 	[it8782] = {
 		.name = "it8782",
 		.features = FEAT_16BIT_FANS | FEAT_TEMP_OFFSET
@@ -1761,6 +1769,9 @@ static int __init it87_find(unsigned short *address,
 	case IT8772E_DEVID:
 		sio_data->type = it8772;
 		break;
+	case IT8781F_DEVID:
+		sio_data->type = it8781;
+		break;
 	case IT8782F_DEVID:
 		sio_data->type = it8782;
 		break;
@@ -1919,10 +1930,11 @@ static int __init it87_find(unsigned short *address,
 		reg = superio_inb(IT87_SIO_GPIO3_REG);
 		if (sio_data->type == it8721 || sio_data->type == it8728 ||
 		    sio_data->type == it8771 || sio_data->type == it8772 ||
-		    sio_data->type == it8782) {
+		    sio_data->type == it8781 || sio_data->type == it8782) {
 			/*
-			 * IT8721F/IT8758E, and IT8782F don't have VID pins
-			 * at all, not sure about the IT8728F and compatibles.
+			 * IT8721F/IT8758E, IT8728F, IT8772F, IT8781F, and
+			 * IT8782F don't have VID pins at all, not sure about
+			 * the IT8771F.
 			 */
 			sio_data->skip_vid = 1;
 		} else {
@@ -2147,7 +2159,8 @@ static int it87_probe(struct platform_device *pdev)
 			data->in_scaled |= (1 << 8);	/* in8 is Vbat */
 		if (sio_data->internal & (1 << 3))
 			data->in_scaled |= (1 << 9);	/* in9 is AVCC */
-	} else if (sio_data->type == it8782 || sio_data->type == it8783) {
+	} else if (sio_data->type == it8781 || sio_data->type == it8782 ||
+		   sio_data->type == it8783) {
 		if (sio_data->internal & (1 << 0))
 			data->in_scaled |= (1 << 3);	/* in3 is VCC5V */
 		if (sio_data->internal & (1 << 1))
@@ -2460,9 +2473,12 @@ static void it87_init_device(struct platform_device *pdev)
 			it87_write_value(data, IT87_REG_FAN_16BIT,
 					 tmp | 0x07);
 		}
-		/* IT8705F, IT8782F, and IT8783E/F only support three fans. */
-		if (data->type != it87 && data->type != it8782 &&
-		    data->type != it8783) {
+		/*
+		 * IT8705F, IT8781F, IT8782F, and IT8783E/F only support
+		 * three fans.
+		 */
+		if (data->type != it87 && data->type != it8781 &&
+		    data->type != it8782 && data->type != it8783) {
 			if (tmp & (1 << 4))
 				data->has_fan |= (1 << 3); /* fan4 enabled */
 			if (tmp & (1 << 5))