hwmon: (it87) Add support for IT8786E

IT8786E is mostly compatible with IT8771 / IT8772.
Parameters determined by testing various combinations.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Thomas Lorblanches <zlika_ese@hotmail.com>
[Guenter Roeck: merged from github, addressed review comments]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

3 files changed, 23 insertions, 9 deletions

diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87
index 8e192fff10f4..19fbe775ae10 100644
--- a/Documentation/hwmon/it87
+++ b/Documentation/hwmon/it87
@@ -54,6 +54,10 @@ Supported chips:
     Prefix: 'it8783'
     Addresses scanned: from Super I/O config space (8 I/O ports)
     Datasheet: Not publicly available
+  * IT8786E
+    Prefix: 'it8786'
+    Addresses scanned: from Super I/O config space (8 I/O ports)
+    Datasheet: Not publicly available
   * SiS950   [clone of IT8705F]
     Prefix: 'it87'
     Addresses scanned: from Super I/O config space (8 I/O ports)
@@ -100,7 +104,7 @@ Description
 
 This driver implements support for the IT8603E, IT8623E, IT8705F, IT8712F,
 IT8716F, IT8718F, IT8720F, IT8721F, IT8726F, IT8728F, IT8758E, IT8771E,
-IT8772E, IT8781F, IT8782F, IT8783E/F, and SiS950 chips.
+IT8772E, IT8781F, IT8782F, IT8783E/F, IT8786E, and SiS950 chips.
 
 These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
 joysticks and other miscellaneous stuff. For hardware monitoring, they
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index e96c0ebaaceb..4b40ea79b20f 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, IT8781F, IT8782F, IT8783E/F and IT8603E
-          sensor chips, and the SiS950 clone.
+          IT8771E, IT8772E, IT8781F, IT8782F, IT8783E/F, IT8786E,
+          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 9ca10a73aee8..691067bbe07c 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -26,6 +26,7 @@
  *            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
+ *            IT8786E  Super I/O chip w/LPC interface
  *            Sis950   A clone of the IT8705F
  *
  *  Copyright (C) 2001 Chris Gauthron
@@ -67,7 +68,7 @@
 #define DRVNAME "it87"
 
 enum chips { it87, it8712, it8716, it8718, it8720, it8721, it8728, it8771,
-             it8772, it8781, it8782, it8783, it8603 };
+             it8772, it8781, it8782, it8783, it8786, it8603 };
 
 static unsigned short force_id;
 module_param(force_id, ushort, 0);
@@ -150,6 +151,7 @@ static inline void superio_exit(void)
 #define IT8781F_DEVID 0x8781
 #define IT8782F_DEVID 0x8782
 #define IT8783E_DEVID 0x8783
+#define IT8786E_DEVID 0x8786
 #define IT8603E_DEVID 0x8603
 #define IT8623E_DEVID 0x8623
 #define IT87_ACT_REG  0x30
@@ -335,6 +337,12 @@ static const struct it87_devices it87_devices[] = {
                   | FEAT_TEMP_OLD_PECI | FEAT_FAN16_CONFIG,
                 .old_peci_mask = 0x4,
         },
+        [it8786] = {
+                .name = "it8786",
+                .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
+                  | FEAT_TEMP_OFFSET | FEAT_TEMP_PECI,
+                .peci_mask = 0x07,
+        },
         [it8603] = {
                 .name = "it8603",
                 .features = FEAT_NEWER_AUTOPWM | FEAT_12MV_ADC | FEAT_16BIT_FANS
@@ -1789,6 +1797,9 @@ static int __init it87_find(unsigned short *address,
         case IT8783E_DEVID:
                 sio_data->type = it8783;
                 break;
+        case IT8786E_DEVID:
+                sio_data->type = it8786;
+                break;
         case IT8603E_DEVID:
         case IT8623E_DEVID:
                 sio_data->type = it8603;
@@ -1816,8 +1827,8 @@ static int __init it87_find(unsigned short *address,
         sio_data->revision = superio_inb(DEVREV) & 0x0f;
         pr_info("Found IT%04x%c chip at 0x%x, revision %d\n", chip_type,
                 chip_type == 0x8771 || chip_type == 0x8772 ||
-                chip_type == 0x8603 ? 'E' : 'F', *address,
-                sio_data->revision);
+                chip_type == 0x8786 || chip_type == 0x8603 ? 'E' : 'F',
+                *address, sio_data->revision);
 
         /* in8 (Vbat) is always internal */
         sio_data->internal = (1 << 2);
@@ -1987,9 +1998,8 @@ 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 == it8728 || sio_data->type == it8771 ||
+                    sio_data->type == it8772 || sio_data->type == it8786)
                         sio_data->internal |= (1 << 1);
 
                 /*