hwmon: (it87) Add support for IT8620E

IT8620E is mostly compatible to IT7828F. Add generic support for it.

IT8620E supports up to 6 fan tachometers and 6 pwm controls.
Support for the 6th tachometer and for the additional pwm controls
are addded in separate patches.

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

3 files changed, 53 insertions, 5 deletions

diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87
index 91e8f011dacf..e87294878334 100644
--- a/Documentation/hwmon/it87
+++ b/Documentation/hwmon/it87
@@ -6,6 +6,10 @@ Supported chips:
     Prefix: 'it8603'
     Addresses scanned: from Super I/O config space (8 I/O ports)
     Datasheet: Not publicly available
+  * IT8620E
+    Prefix: 'it8620'
+    Addresses scanned: from Super I/O config space (8 I/O ports)
+    Datasheet: Not publicly available
   * IT8705F
     Prefix: 'it87'
     Addresses scanned: from Super I/O config space (8 I/O ports)
@@ -106,7 +110,7 @@ motherboard models.
 Description
 -----------
 
-This driver implements support for the IT8603E, IT8623E, IT8705F,
+This driver implements support for the IT8603E, IT8620E, IT8623E, IT8705F,
 IT8712F, IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8758E,
 IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F, IT8786E, IT8790E, and SiS950
 chips.
@@ -147,8 +151,11 @@ The IT8728F, IT8771E, and IT8772E are considered compatible with the IT8721F,
 until a datasheet becomes available (hopefully.)
 
 The IT8603E/IT8623E is a custom design, hardware monitoring part is similar to
-IT8728F. It only supports 16-bit fan mode, the full speed mode of the
-fan is not supported (value 0 of pwmX_enable).
+IT8728F. It only supports 3 fans, 16-bit fan mode, and the full speed mode
+of the fan is not supported (value 0 of pwmX_enable).
+
+The IT8620E is another custom design, hardware monitoring part is similar to
+IT8728F. It only supports 16-bit fan mode.
 
 The IT8790E supports up to 3 fans. 16-bit fan mode is always enabled.
 
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 848ddfe30ef8..25d9e72627e9 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -601,7 +601,7 @@ config SENSORS_IT87
 	  If you say yes here you get support for ITE IT8705F, IT8712F,
 	  IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8758E,
 	  IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F, IT8786E, IT8790E,
-	  IT8603E, and IT8623E sensor chips, and the SiS950 clone.
+	  IT8603E, IT8620E, and IT8623E 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 80580cdf9a15..4e4db72d38e8 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -11,6 +11,7 @@
  *  similar parts.  The other devices are supported by different drivers.
  *
  *  Supports: IT8603E  Super I/O chip w/LPC interface
+ *            IT8620E  Super I/O chip w/LPC interface
  *            IT8623E  Super I/O chip w/LPC interface
  *            IT8705F  Super I/O chip w/LPC interface
  *            IT8712F  Super I/O chip w/LPC interface
@@ -69,7 +70,7 @@
 #define DRVNAME "it87"
 
 enum chips { it87, it8712, it8716, it8718, it8720, it8721, it8728, it8771,
-	     it8772, it8781, it8782, it8783, it8786, it8790, it8603 };
+	     it8772, it8781, it8782, it8783, it8786, it8790, it8603, it8620 };
 
 static unsigned short force_id;
 module_param(force_id, ushort, 0);
@@ -155,12 +156,14 @@ static inline void superio_exit(void)
 #define IT8786E_DEVID 0x8786
 #define IT8790E_DEVID 0x8790
 #define IT8603E_DEVID 0x8603
+#define IT8620E_DEVID 0x8620
 #define IT8623E_DEVID 0x8623
 #define IT87_ACT_REG  0x30
 #define IT87_BASE_REG 0x60
 
 /* Logical device 7 registers (IT8712F and later) */
 #define IT87_SIO_GPIO1_REG	0x25
+#define IT87_SIO_GPIO2_REG	0x26
 #define IT87_SIO_GPIO3_REG	0x27
 #define IT87_SIO_GPIO5_REG	0x29
 #define IT87_SIO_PINX1_REG	0x2a	/* Pin selection */
@@ -375,6 +378,14 @@ static const struct it87_devices it87_devices[] = {
 		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_IN7_INTERNAL,
 		.peci_mask = 0x07,
 	},
+	[it8620] = {
+		.name = "it8620",
+		.suffix = "E",
+		.features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
+		  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI | FEAT_FIVE_FANS
+		  | FEAT_IN7_INTERNAL,
+		.peci_mask = 0x07,
+	},
 };
 
 #define has_16bit_fans(data)	((data)->features & FEAT_16BIT_FANS)
@@ -1850,6 +1861,9 @@ static int __init it87_find(unsigned short *address,
 	case IT8623E_DEVID:
 		sio_data->type = it8603;
 		break;
+	case IT8620E_DEVID:
+		sio_data->type = it8620;
+		break;
 	case 0xffff:	/* No device at all */
 		goto exit;
 	default:
@@ -1985,6 +1999,33 @@ static int __init it87_find(unsigned short *address,
 		sio_data->internal |= (1 << 3); /* in9 is AVCC */
 
 		sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f;
+	} else if (sio_data->type == it8620) {
+		int reg;
+
+		superio_select(GPIO);
+
+		/* Check for fan4, fan5 */
+		reg = superio_inb(IT87_SIO_GPIO2_REG);
+		if (!(reg & (1 << 5)))
+			sio_data->skip_fan |= (1 << 3);
+		if (!(reg & (1 << 4)))
+			sio_data->skip_fan |= (1 << 4);
+
+		/* Check for pwm3, fan3 */
+		reg = superio_inb(IT87_SIO_GPIO3_REG);
+		if (reg & (1 << 6))
+			sio_data->skip_pwm |= (1 << 2);
+		if (reg & (1 << 7))
+			sio_data->skip_fan |= (1 << 2);
+
+		/* Check for pwm2, fan2 */
+		reg = superio_inb(IT87_SIO_GPIO5_REG);
+		if (reg & (1 << 1))
+			sio_data->skip_pwm |= (1 << 1);
+		if (reg & (1 << 2))
+			sio_data->skip_fan |= (1 << 1);
+
+		sio_data->beep_pin = superio_inb(IT87_SIO_BEEP_PIN_REG) & 0x3f;
 	} else {
 		int reg;
 		bool uart6;