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platform/x86: asus-wmi: Add support for MCU powersave 

Add support for an MCU powersave WMI call. This is intended to set the
MCU in to a low-power mode when sleeping. This mode can cut sleep power
use by around half.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Luke D. Jones <luke@ljones.dev>
Link: https://lore.kernel.org/r/20240404001652.86207-9-luke@ljones.dev
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Luke D. Jones 2024-04-04 13:16:51 +13:00 committed by Hans de Goede
parent 7e7a5dee49
commit a94e8a56f9
2 changed files with 59 additions and 0 deletions
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9
Documentation/ABI/testing/sysfs-platform-asus-wmi
View File

@ -203,3 +203,12 @@ Description:
Set if the BIOS POST sound is played on boot.
* 0 - False,
* 1 - True
What: /sys/devices/platform/<platform>/mcu_powersave
Date: Apr 2024
KernelVersion: 6.10
Contact: "Luke Jones" <luke@ljones.dev>
Description:
Set if the MCU can go in to low-power mode on system sleep
* 0 - False,
* 1 - True

50
drivers/platform/x86/asus-wmi.c
View File

@ -1303,6 +1303,53 @@ static ssize_t nv_temp_target_show(struct device *dev,
}
static DEVICE_ATTR_RW(nv_temp_target);
/* Ally MCU Powersave ********************************************************/
static ssize_t mcu_powersave_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct asus_wmi *asus = dev_get_drvdata(dev);
int result;
result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_MCU_POWERSAVE);
if (result < 0)
return result;
return sysfs_emit(buf, "%d\n", result);
}
static ssize_t mcu_powersave_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int result, err;
u32 enable;
struct asus_wmi *asus = dev_get_drvdata(dev);
result = kstrtou32(buf, 10, &enable);
if (result)
return result;
if (enable > 1)
return -EINVAL;
err = asus_wmi_set_devstate(ASUS_WMI_DEVID_MCU_POWERSAVE, enable, &result);
if (err) {
pr_warn("Failed to set MCU powersave: %d\n", err);
return err;
}
if (result > 1) {
pr_warn("Failed to set MCU powersave (result): 0x%x\n", result);
return -EIO;
}
sysfs_notify(&asus->platform_device->dev.kobj, NULL, "mcu_powersave");
return count;
}
static DEVICE_ATTR_RW(mcu_powersave);
/* Battery ********************************************************************/
/* The battery maximum charging percentage */
@ -4317,6 +4364,7 @@ static struct attribute *platform_attributes[] = {
&dev_attr_ppt_platform_sppt.attr,
&dev_attr_nv_dynamic_boost.attr,
&dev_attr_nv_temp_target.attr,
&dev_attr_mcu_powersave.attr,
&dev_attr_boot_sound.attr,
&dev_attr_panel_od.attr,
&dev_attr_mini_led_mode.attr,
@ -4370,6 +4418,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
devid = ASUS_WMI_DEVID_NV_DYN_BOOST;
else if (attr == &dev_attr_nv_temp_target.attr)
devid = ASUS_WMI_DEVID_NV_THERM_TARGET;
else if (attr == &dev_attr_mcu_powersave.attr)
devid = ASUS_WMI_DEVID_MCU_POWERSAVE;
else if (attr == &dev_attr_boot_sound.attr)
devid = ASUS_WMI_DEVID_BOOT_SOUND;
else if (attr == &dev_attr_panel_od.attr)