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Subject[PATCH v2 2/2] asus-wmi: Support the GPU fan on TUF laptops
Date
Add support for TUF laptops which have the ability to control
the GPU fan. This will show as a second fan in hwmon, and has
the ability to run as boost (fullspeed), or auto.

Signed-off-by: Luke D. Jones <luke@ljones.dev>
---
drivers/platform/x86/asus-wmi.c | 71 ++++++++++++++++++++++
include/linux/platform_data/x86/asus-wmi.h | 1 +
2 files changed, 72 insertions(+)

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index 04699dd72f1b..d5d8bf07a3cd 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -222,7 +222,9 @@ struct asus_wmi {
struct asus_rfkill uwb;

enum fan_type fan_type;
+ enum fan_type gpu_fan_type;
int fan_pwm_mode;
+ int gpu_fan_pwm_mode;
int agfn_pwm;

bool fan_boost_mode_available;
@@ -1750,6 +1752,18 @@ static int asus_fan_set_auto(struct asus_wmi *asus)
return -ENXIO;
}

+ /*
+ * Modern models like the G713 also have GPU fan control (this is not AGFN)
+ */
+ if (asus->gpu_fan_type == FAN_TYPE_SPEC83) {
+ status = asus_wmi_set_devstate(ASUS_WMI_DEVID_GPU_FAN_CTRL,
+ 0, &retval);
+ if (status)
+ return status;
+
+ if (retval != 1)
+ return -EIO;
+ }

return 0;
}
@@ -1952,9 +1966,57 @@ static ssize_t asus_hwmon_temp1(struct device *dev,
deci_kelvin_to_millicelsius(value & 0xFFFF));
}

+/* GPU fan on modern ROG laptops */
+static ssize_t pwm2_enable_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%d\n", asus->gpu_fan_pwm_mode);
+}
+
+static ssize_t pwm2_enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct asus_wmi *asus = dev_get_drvdata(dev);
+ int state;
+ int value;
+ int ret;
+ u32 retval;
+
+ ret = kstrtouint(buf, 10, &state);
+ if (ret)
+ return ret;
+
+ switch (state) { /* standard documented hwmon values */
+ case ASUS_FAN_CTRL_FULLSPEED:
+ value = 1;
+ break;
+ case ASUS_FAN_CTRL_AUTO:
+ value = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = asus_wmi_set_devstate(ASUS_WMI_DEVID_GPU_FAN_CTRL,
+ value, &retval);
+ if (ret)
+ return ret;
+
+ if (retval != 1)
+ return -EIO;
+
+ asus->gpu_fan_pwm_mode = state;
+ return count;
+}
+
/* 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);

@@ -1964,6 +2026,7 @@ static DEVICE_ATTR(temp1_input, S_IRUGO, asus_hwmon_temp1, NULL);
static struct attribute *hwmon_attributes[] = {
&dev_attr_pwm1.attr,
&dev_attr_pwm1_enable.attr,
+ &dev_attr_pwm2_enable.attr,
&dev_attr_fan1_input.attr,
&dev_attr_fan1_label.attr,

@@ -1986,6 +2049,9 @@ 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) {
+ if (asus->gpu_fan_type == FAN_TYPE_NONE)
+ return 0;
} else if (attr == &dev_attr_temp1_input.attr) {
int err = asus_wmi_get_devstate(asus,
ASUS_WMI_DEVID_THERMAL_CTRL,
@@ -2028,6 +2094,7 @@ static int asus_wmi_hwmon_init(struct asus_wmi *asus)

static int asus_wmi_fan_init(struct asus_wmi *asus)
{
+ asus->gpu_fan_type = FAN_TYPE_NONE;
asus->fan_type = FAN_TYPE_NONE;
asus->agfn_pwm = -1;

@@ -2036,6 +2103,10 @@ static int asus_wmi_fan_init(struct asus_wmi *asus)
else if (asus_wmi_has_agfn_fan(asus))
asus->fan_type = FAN_TYPE_AGFN;

+ /* Modern models like G713 also have GPU fan control */
+ if (asus_wmi_dev_is_present(asus, ASUS_WMI_DEVID_GPU_FAN_CTRL))
+ asus->gpu_fan_type = FAN_TYPE_SPEC83;
+
if (asus->fan_type == FAN_TYPE_NONE)
return -ENODEV;

diff --git a/include/linux/platform_data/x86/asus-wmi.h b/include/linux/platform_data/x86/asus-wmi.h
index 9132b43c2666..56ebe9f97e08 100644
--- a/include/linux/platform_data/x86/asus-wmi.h
+++ b/include/linux/platform_data/x86/asus-wmi.h
@@ -78,6 +78,7 @@
#define ASUS_WMI_DEVID_THERMAL_CTRL 0x00110011
#define ASUS_WMI_DEVID_FAN_CTRL 0x00110012 /* deprecated */
#define ASUS_WMI_DEVID_CPU_FAN_CTRL 0x00110013
+#define ASUS_WMI_DEVID_GPU_FAN_CTRL 0x00110014
#define ASUS_WMI_DEVID_CPU_FAN_CURVE 0x00110024
#define ASUS_WMI_DEVID_GPU_FAN_CURVE 0x00110025

--
2.37.1
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