it87: Add support for the IT8718F

it87: Add support for the IT8718F

The IT8718F is a Super-I/O chip with integrated hardware monitoring
functions. It is very similar to the IT8716F, so adding support to the
it87 driver was pretty straightforward. The most significant difference
is that the IT8718F has up to 8 VID pins, instead of 6 for the older
chips.

For the IT8718F, the VID value can only be read from Super-I/O space.

Userspace support is already in lm_sensors SVN (to be soon released
as 2.10.1.)

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 74 insertions, 24 deletions

diff --git a/Documentation/hwmon/it87 b/Documentation/hwmon/it87
index aff680784222..a45044e82662 100644
--- a/Documentation/hwmon/it87
+++ b/Documentation/hwmon/it87
@@ -18,6 +18,12 @@ Supported chips:
     Addresses scanned: from Super I/O config space (8 I/O ports)
     Datasheet: Publicly available at the ITE website
                http://www.ite.com.tw/product_info/file/pc/IT8716F_V0.3.ZIP
+  * IT8718F
+    Prefix: 'it8718'
+    Addresses scanned: from Super I/O config space (8 I/O ports)
+    Datasheet: Publicly available at the ITE website
+               http://www.ite.com.tw/product_info/file/pc/IT8718F_V0.2.zip
+               http://www.ite.com.tw/product_info/file/pc/IT8718F_V0%203_(for%20C%20version).zip
   * SiS950   [clone of IT8705F]
     Prefix: 'it87'
     Addresses scanned: from Super I/O config space (8 I/O ports)
@@ -48,8 +54,8 @@ Module Parameters
 Description
 -----------
 
-This driver implements support for the IT8705F, IT8712F, IT8716F and
-SiS950 chips.
+This driver implements support for the IT8705F, IT8712F, IT8716F,
+IT8718F and SiS950 chips.
 
 These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
 joysticks and other miscellaneous stuff. For hardware monitoring, they
@@ -62,14 +68,21 @@ the IT8716F and late IT8712F have 6. They are shared with other functions
 though, so the functionality may not be available on a given system.
 The driver dumbly assume it is there.
 
-The IT8716F and later IT8712F revisions have support for 2 additional
-fans. They are not yet supported by the driver.
+The IT8718F also features VID inputs (up to 8 pins) but the value is
+stored in the Super-I/O configuration space. Due to technical limitations,
+this value can currently only be read once at initialization time, so
+the driver won't notice and report changes in the VID value. The two
+upper VID bits share their pins with voltage inputs (in5 and in6) so you
+can't have both on a given board.
+
+The IT8716F, IT8718F and later IT8712F revisions have support for
+2 additional fans. They are not yet supported by the driver.
 
-The IT8716F and late IT8712F and IT8705F also have optional 16-bit
-tachometer counters for fans 1 to 3. This is better (no more fan
+The IT8716F and IT8718F, and late IT8712F and IT8705F also have optional
+16-bit tachometer counters for fans 1 to 3. This is better (no more fan
 clock divider mess) but not compatible with the older chips and
 revisions. For now, the driver only uses the 16-bit mode on the
-IT8716F.
+IT8716F and IT8718F.
 
 Temperatures are measured in degrees Celsius. An alarm is triggered once
 when the Overtemperature Shutdown limit is crossed.
@@ -89,9 +102,9 @@ zero'; this is important for negative voltage measurements. All voltage
 inputs can measure voltages between 0 and 4.08 volts, with a resolution of
 0.016 volt. The battery voltage in8 does not have limit registers.
 
-The VID lines (IT8712F/IT8716F) encode the core voltage value: the voltage
-level your processor should work with. This is hardcoded by the mainboard
-and/or processor itself. It is a value in volts.
+The VID lines (IT8712F/IT8716F/IT8718F) encode the core voltage value:
+the voltage level your processor should work with. This is hardcoded by
+the mainboard and/or processor itself. It is a value in volts.
 
 If an alarm triggers, it will remain triggered until the hardware register
 is read at least once. This means that the cause for the alarm may already
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index cefb1adf4534..78c237f8fa0a 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -186,8 +186,8 @@ config SENSORS_IT87
 	select I2C_ISA
 	select HWMON_VID
 	help
-	  If you say yes here you get support for ITE IT8705F, IT8712F and
-	  IT8716F sensor chips, and the SiS960 clone.
+	  If you say yes here you get support for ITE IT8705F, IT8712F,
+	  IT8716F and IT8718F sensor chips, and the SiS960 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 e9ab8a32903b..956cd553c711 100644
--- a/drivers/hwmon/it87.c
+++ b/drivers/hwmon/it87.c
@@ -5,6 +5,7 @@
     Supports: IT8705F  Super I/O chip w/LPC interface
               IT8712F  Super I/O chip w/LPC interface & SMBus
               IT8716F  Super I/O chip w/LPC interface
+              IT8718F  Super I/O chip w/LPC interface
               Sis950   A clone of the IT8705F
 
     Copyright (C) 2001 Chris Gauthron <chrisg@0-in.com> 
@@ -51,12 +52,13 @@ static unsigned short normal_i2c[] = { 0x2d, I2C_CLIENT_END };
 static unsigned short isa_address;
 
 /* Insmod parameters */
-I2C_CLIENT_INSMOD_3(it87, it8712, it8716);
+I2C_CLIENT_INSMOD_4(it87, it8712, it8716, it8718);
 
 #define	REG	0x2e	/* The register to read/write */
 #define	DEV	0x07	/* Register: Logical device select */
 #define	VAL	0x2f	/* The value to read/write */
 #define PME	0x04	/* The device with the fan registers in it */
+#define GPIO	0x07	/* The device with the IT8718F VID value in it */
 #define	DEVID	0x20	/* Register: Device ID */
 #define	DEVREV	0x22	/* Register: Device Revision */
 
@@ -78,10 +80,10 @@ static int superio_inw(int reg)
 }
 
 static inline void
-superio_select(void)
+superio_select(int ldn)
 {
 	outb(DEV, REG);
-	outb(PME, VAL);
+	outb(ldn, VAL);
 }
 
 static inline void
@@ -100,21 +102,27 @@ superio_exit(void)
 	outb(0x02, VAL);
 }
 
+/* Logical device 4 registers */
 #define IT8712F_DEVID 0x8712
 #define IT8705F_DEVID 0x8705
 #define IT8716F_DEVID 0x8716
+#define IT8718F_DEVID 0x8718
 #define IT87_ACT_REG  0x30
 #define IT87_BASE_REG 0x60
 
+/* Logical device 7 registers (IT8712F and later) */
+#define IT87_SIO_PINX2_REG	0x2c	/* Pin selection */
+#define IT87_SIO_VID_REG	0xfc	/* VID value */
+
 /* Update battery voltage after every reading if true */
 static int update_vbat;
 
 /* Not all BIOSes properly configure the PWM registers */
 static int fix_pwm_polarity;
 
-/* Chip Type */
-
+/* Values read from Super-I/O config space */
 static u16 chip_type;
+static u8 vid_value;
 
 /* Many IT87 constants specified below */
 
@@ -133,6 +141,8 @@ static u16 chip_type;
 #define IT87_REG_ALARM2        0x02
 #define IT87_REG_ALARM3        0x03
 
+/* The IT8718F has the VID value in a different register, in Super-I/O
+   configuration space. */
 #define IT87_REG_VID           0x0a
 /* Warning: register 0x0b is used for something completely different in
    new chips/revisions. I suspect only 16-bit tachometer mode will work
@@ -793,10 +803,11 @@ static int __init it87_find(unsigned short *address)
 	chip_type = superio_inw(DEVID);
 	if (chip_type != IT8712F_DEVID
 	 && chip_type != IT8716F_DEVID
+	 && chip_type != IT8718F_DEVID
 	 && chip_type != IT8705F_DEVID)
 	 	goto exit;
 
-	superio_select();
+	superio_select(PME);
 	if (!(superio_inb(IT87_ACT_REG) & 0x01)) {
 		pr_info("it87: Device not activated, skipping\n");
 		goto exit;
@@ -812,6 +823,21 @@ static int __init it87_find(unsigned short *address)
 	pr_info("it87: Found IT%04xF chip at 0x%x, revision %d\n",
 		chip_type, *address, superio_inb(DEVREV) & 0x0f);
 
+	/* Read GPIO config and VID value from LDN 7 (GPIO) */
+	if (chip_type != IT8705F_DEVID) {
+		int reg;
+
+		superio_select(GPIO);
+		if (chip_type == it8718)
+			vid_value = superio_inb(IT87_SIO_VID_REG);
+
+		reg = superio_inb(IT87_SIO_PINX2_REG);
+		if (reg & (1 << 0))
+			pr_info("it87: in3 is VCC (+5V)\n");
+		if (reg & (1 << 1))
+			pr_info("it87: in7 is VCCH (+5V Stand-By)\n");
+	}
+
 exit:
 	superio_exit();
 	return err;
@@ -880,6 +906,9 @@ static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
 				case IT8716F_DEVID:
 					kind = it8716;
 					break;
+				case IT8718F_DEVID:
+					kind = it8718;
+					break;
 				}
 			}
 		}
@@ -900,6 +929,8 @@ static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
 		name = "it8712";
 	} else if (kind == it8716) {
 		name = "it8716";
+	} else if (kind == it8718) {
+		name = "it8718";
 	}
 
 	/* Fill in the remaining client fields and put it into the global list */
@@ -969,7 +1000,8 @@ static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
 	device_create_file(&new_client->dev, &sensor_dev_attr_temp3_type.dev_attr);
 
 	/* Do not create fan files for disabled fans */
-	if (data->type == it8716) { /* 16-bit tachometers */
+	if (data->type == it8716 || data->type == it8718) {
+		/* 16-bit tachometers */
 		if (data->has_fan & (1 << 0)) {
 			device_create_file(&new_client->dev,
 				&sensor_dev_attr_fan1_input16.dev_attr);
@@ -989,6 +1021,7 @@ static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
 				&sensor_dev_attr_fan3_min16.dev_attr);
 		}
 	} else {
+		/* 8-bit tachometers with clock divider */
 		if (data->has_fan & (1 << 0)) {
 			device_create_file(&new_client->dev,
 				&sensor_dev_attr_fan1_input.dev_attr);
@@ -1025,8 +1058,11 @@ static int it87_detect(struct i2c_adapter *adapter, int address, int kind)
 		device_create_file(&new_client->dev, &sensor_dev_attr_pwm3.dev_attr);
 	}
 
-	if (data->type == it8712 || data->type == it8716) {
+	if (data->type == it8712 || data->type == it8716
+	 || data->type == it8718) {
 		data->vrm = vid_which_vrm();
+		/* VID reading from Super-I/O config space if available */
+		data->vid = vid_value;
 		device_create_file_vrm(new_client);
 		device_create_file_vid(new_client);
 	}
@@ -1192,7 +1228,7 @@ static void it87_init_client(struct i2c_client *client, struct it87_data *data)
 	data->has_fan = (data->fan_main_ctrl >> 4) & 0x07;
 
 	/* Set tachometers to 16-bit mode if needed */
-	if (data->type == it8716) {
+	if (data->type == it8716 || data->type == it8718) {
 		tmp = it87_read_value(client, IT87_REG_FAN_16BIT);
 		if (~tmp & 0x07 & data->has_fan) {
 			dev_dbg(&client->dev,
@@ -1265,7 +1301,7 @@ static struct it87_data *it87_update_device(struct device *dev)
 			data->fan[i] = it87_read_value(client,
 				       IT87_REG_FAN(i));
 			/* Add high byte if in 16-bit mode */
-			if (data->type == it8716) {
+			if (data->type == it8716 || data->type == it8718) {
 				data->fan[i] |= it87_read_value(client,
 						IT87_REG_FANX(i)) << 8;
 				data->fan_min[i] |= it87_read_value(client,
@@ -1282,7 +1318,8 @@ static struct it87_data *it87_update_device(struct device *dev)
 		}
 
 		/* Newer chips don't have clock dividers */
-		if ((data->has_fan & 0x07) && data->type != it8716) {
+		if ((data->has_fan & 0x07) && data->type != it8716
+		 && data->type != it8718) {
 			i = it87_read_value(client, IT87_REG_FAN_DIV);
 			data->fan_div[0] = i & 0x07;
 			data->fan_div[1] = (i >> 3) & 0x07;
@@ -1340,7 +1377,7 @@ static void __exit sm_it87_exit(void)
 
 
 MODULE_AUTHOR("Chris Gauthron <chrisg@0-in.com>");
-MODULE_DESCRIPTION("IT8705F/8712F/8716F, SiS950 driver");
+MODULE_DESCRIPTION("IT8705F/8712F/8716F/8718F, SiS950 driver");
 module_param(update_vbat, bool, 0);
 MODULE_PARM_DESC(update_vbat, "Update vbat if set else return powerup value");
 module_param(fix_pwm_polarity, bool, 0);