[PATCH] asus-wmi: Expand support of GPU fan to read RPM and label

["Luke D. Jones" <luke@xxxxxxxxxx>]

The previously added patch to add support for pwm change for TUF laptops
also is usuable for more than TUF. The same method `0x00110014` is
used to read the fan RPM.

Add two extra attributes for reading fan2 plus fan2 label.

Signed-off-by: Luke D. Jones <luke@xxxxxxxxxx>
---
 drivers/platform/x86/asus-wmi.c | 36 +++++++++++++++++++++++++++++++--
 1 file changed, 34 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index ae46af731de9..7fe6ce25da0a 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -72,6 +72,7 @@ module_param(fnlock_default, bool, 0444);
 
 #define ASUS_WMI_FNLOCK_BIOS_DISABLED	BIT(0)
 
+#define ASUS_GPU_FAN_DESC		"gpu_fan"
 #define ASUS_FAN_DESC			"cpu_fan"
 #define ASUS_FAN_MFUN			0x13
 #define ASUS_FAN_SFUN_READ		0x06
@@ -2078,6 +2079,30 @@ static ssize_t asus_hwmon_temp1(struct device *dev,
 }
 
 /* GPU fan on modern ROG laptops */
+static ssize_t fan2_input_show(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct asus_wmi *asus = dev_get_drvdata(dev);
+	int value;
+	int ret;
+
+	ret = asus_wmi_get_devstate(asus, ASUS_WMI_DEVID_GPU_FAN_CTRL, &value);
+	if (ret < 0)
+		return ret;
+
+	value &= 0xffff;
+
+	return sysfs_emit(buf, "%d\n", value < 0 ? -1 : value * 100);
+}
+
+static ssize_t fan2_label_show(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	return sprintf(buf, "%s\n", ASUS_GPU_FAN_DESC);
+}
+
 static ssize_t pwm2_enable_show(struct device *dev,
 				struct device_attribute *attr,
 				char *buf)
@@ -2127,9 +2152,12 @@ static ssize_t pwm2_enable_store(struct device *dev,
 /* Fan1 */
 static DEVICE_ATTR_RW(pwm1);
 static DEVICE_ATTR_RW(pwm1_enable);
-static DEVICE_ATTR_RW(pwm2_enable);
 static DEVICE_ATTR_RO(fan1_input);
 static DEVICE_ATTR_RO(fan1_label);
+/* Fan2 - GPU fan */
+static DEVICE_ATTR_RW(pwm2_enable);
+static DEVICE_ATTR_RO(fan2_input);
+static DEVICE_ATTR_RO(fan2_label);
 
 /* Temperature */
 static DEVICE_ATTR(temp1_input, S_IRUGO, asus_hwmon_temp1, NULL);
@@ -2140,6 +2168,8 @@ static struct attribute *hwmon_attributes[] = {
 	&dev_attr_pwm2_enable.attr,
 	&dev_attr_fan1_input.attr,
 	&dev_attr_fan1_label.attr,
+	&dev_attr_fan2_input.attr,
+	&dev_attr_fan2_label.attr,
 
 	&dev_attr_temp1_input.attr,
 	NULL
@@ -2160,7 +2190,9 @@ static umode_t asus_hwmon_sysfs_is_visible(struct kobject *kobj,
 	    || attr == &dev_attr_pwm1_enable.attr) {
 		if (asus->fan_type == FAN_TYPE_NONE)
 			return 0;
-	} else if (attr == &dev_attr_pwm2_enable.attr) {
+	} else if (attr == &dev_attr_fan2_input.attr
+	    || attr == &dev_attr_fan2_label.attr
+	    || attr == &dev_attr_pwm2_enable.attr) {
 		if (asus->gpu_fan_type == FAN_TYPE_NONE)
 			return 0;
 	} else if (attr == &dev_attr_temp1_input.attr) {
-- 
2.37.3