hwmon: (it87) Add support for fan4 and fan5

Add support for the IT8716F and IT8718F fan4 and fan5. The late
revisions of the IT8712F have these too but support is harder to add
and nobody asked for it yet, so I didn't include it.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

Documentation/hwmon/it87

@@ -90,7 +90,8 @@ 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.
+2 additional fans. They are supported by the driver for the IT8716F and
+IT8718F but not for the IT8712F
 
 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

drivers/hwmon/it87.c

@@ -141,10 +141,10 @@ static int fix_pwm_polarity;
 
 /* Monitors: 9 voltage (0 to 7, battery), 3 temp (1 to 3), 3 fan (1 to 3) */
 
-#define IT87_REG_FAN(nr)       (0x0d + (nr))
-#define IT87_REG_FAN_MIN(nr)   (0x10 + (nr))
-#define IT87_REG_FANX(nr)      (0x18 + (nr))
-#define IT87_REG_FANX_MIN(nr)  (0x1b + (nr))
+static const u8 IT87_REG_FAN[]		= { 0x0d, 0x0e, 0x0f, 0x80, 0x82 };
+static const u8 IT87_REG_FAN_MIN[]	= { 0x10, 0x11, 0x12, 0x84, 0x86 };
+static const u8 IT87_REG_FANX[]		= { 0x18, 0x19, 0x1a, 0x81, 0x83 };
+static const u8 IT87_REG_FANX_MIN[]	= { 0x1b, 0x1c, 0x1d, 0x85, 0x87 };
 #define IT87_REG_FAN_MAIN_CTRL 0x13
 #define IT87_REG_FAN_CTL       0x14
 #define IT87_REG_PWM(nr)       (0x15 + (nr))
@@ -235,8 +235,8 @@ struct it87_data {
 	u8 in_max[8];		/* Register value */
 	u8 in_min[8];		/* Register value */
 	u8 has_fan;		/* Bitfield, fans enabled */
-	u16 fan[3];		/* Register values, possibly combined */
-	u16 fan_min[3];		/* Register values, possibly combined */
+	u16 fan[5];		/* Register values, possibly combined */
+	u16 fan_min[5];		/* Register values, possibly combined */
 	u8 temp[3];		/* Register value */
 	u8 temp_high[3];	/* Register value */
 	u8 temp_low[3];		/* Register value */
@@ -555,7 +555,7 @@ static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 	}
 
 	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
-	it87_write_value(data, IT87_REG_FAN_MIN(nr), data->fan_min[nr]);
+	it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
 	mutex_unlock(&data->update_lock);
 	return count;
 }
@@ -596,7 +596,7 @@ static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 
 	/* Restore fan min limit */
 	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
-	it87_write_value(data, IT87_REG_FAN_MIN(nr), data->fan_min[nr]);
+	it87_write_value(data, IT87_REG_FAN_MIN[nr], data->fan_min[nr]);
 
 	mutex_unlock(&data->update_lock);
 	return count;
@@ -729,9 +729,9 @@ static ssize_t set_fan16_min(struct device *dev, struct device_attribute *attr,
 
 	mutex_lock(&data->update_lock);
 	data->fan_min[nr] = FAN16_TO_REG(val);
-	it87_write_value(data, IT87_REG_FAN_MIN(nr),
+	it87_write_value(data, IT87_REG_FAN_MIN[nr],
 			 data->fan_min[nr] & 0xff);
-	it87_write_value(data, IT87_REG_FANX_MIN(nr),
+	it87_write_value(data, IT87_REG_FANX_MIN[nr],
 			 data->fan_min[nr] >> 8);
 	mutex_unlock(&data->update_lock);
 	return count;
@@ -751,6 +751,8 @@ static struct sensor_device_attribute sensor_dev_attr_fan##offset##_min16 \
 show_fan16_offset(1);
 show_fan16_offset(2);
 show_fan16_offset(3);
+show_fan16_offset(4);
+show_fan16_offset(5);
 
 /* Alarms */
 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
@@ -851,6 +853,10 @@ static struct attribute *it87_attributes_opt[] = {
 	&sensor_dev_attr_fan2_min16.dev_attr.attr,
 	&sensor_dev_attr_fan3_input16.dev_attr.attr,
 	&sensor_dev_attr_fan3_min16.dev_attr.attr,
+	&sensor_dev_attr_fan4_input16.dev_attr.attr,
+	&sensor_dev_attr_fan4_min16.dev_attr.attr,
+	&sensor_dev_attr_fan5_input16.dev_attr.attr,
+	&sensor_dev_attr_fan5_min16.dev_attr.attr,
 
 	&sensor_dev_attr_fan1_input.dev_attr.attr,
 	&sensor_dev_attr_fan1_min.dev_attr.attr,
@@ -1024,6 +1030,20 @@ static int __devinit it87_probe(struct platform_device *pdev)
 			     &sensor_dev_attr_fan3_min16.dev_attr)))
 				goto ERROR4;
 		}
+		if (data->has_fan & (1 << 3)) {
+			if ((err = device_create_file(dev,
+			     &sensor_dev_attr_fan4_input16.dev_attr))
+			 || (err = device_create_file(dev,
+			     &sensor_dev_attr_fan4_min16.dev_attr)))
+				goto ERROR4;
+		}
+		if (data->has_fan & (1 << 4)) {
+			if ((err = device_create_file(dev,
+			     &sensor_dev_attr_fan5_input16.dev_attr))
+			 || (err = device_create_file(dev,
+			     &sensor_dev_attr_fan5_min16.dev_attr)))
+				goto ERROR4;
+		}
 	} else {
 		/* 8-bit tachometers with clock divider */
 		if (data->has_fan & (1 << 0)) {
@@ -1260,6 +1280,10 @@ static void __devinit it87_init_device(struct platform_device *pdev)
 			it87_write_value(data, IT87_REG_FAN_16BIT,
 					 tmp | 0x07);
 		}
+		if (tmp & (1 << 4))
+			data->has_fan |= (1 << 3);	/* fan4 enabled */
+		if (tmp & (1 << 5))
+			data->has_fan |= (1 << 4);	/* fan5 enabled */
 	}
 
 	/* Set current fan mode registers and the default settings for the
@@ -1314,21 +1338,21 @@ static struct it87_data *it87_update_device(struct device *dev)
 		data->in[8] =
 		    it87_read_value(data, IT87_REG_VIN(8));
 
-		for (i = 0; i < 3; i++) {
+		for (i = 0; i < 5; i++) {
 			/* Skip disabled fans */
 			if (!(data->has_fan & (1 << i)))
 				continue;
 
 			data->fan_min[i] =
-			    it87_read_value(data, IT87_REG_FAN_MIN(i));
+			    it87_read_value(data, IT87_REG_FAN_MIN[i]);
 			data->fan[i] = it87_read_value(data,
-				       IT87_REG_FAN(i));
+				       IT87_REG_FAN[i]);
 			/* Add high byte if in 16-bit mode */
 			if (data->type == it8716 || data->type == it8718) {
 				data->fan[i] |= it87_read_value(data,
-						IT87_REG_FANX(i)) << 8;
+						IT87_REG_FANX[i]) << 8;
 				data->fan_min[i] |= it87_read_value(data,
-						IT87_REG_FANX_MIN(i)) << 8;
+						IT87_REG_FANX_MIN[i]) << 8;
 			}
 		}
 		for (i = 0; i < 3; i++) {