From: "Luke D. Jones" To: hdegoede@redhat.com Cc: corentin.chary@gmail.com, ilpo.jarvinen@linux.intel.com, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, "Luke D. Jones" Subject: [PATCH v4 8/9] platform/x86: asus-wmi: Add support for MCU powersave Date: Thu, 4 Apr 2024 13:16:51 +1300 [thread overview] Message-ID: <20240404001652.86207-9-luke@ljones.dev> (raw) In-Reply-To: <20240404001652.86207-1-luke@ljones.dev> 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 Signed-off-by: Luke D. Jones --- .../ABI/testing/sysfs-platform-asus-wmi | 9 ++++ drivers/platform/x86/asus-wmi.c | 50 +++++++++++++++++++ 2 files changed, 59 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi index 72933527d2e4..28144371a0f1 100644 --- a/Documentation/ABI/testing/sysfs-platform-asus-wmi +++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi @@ -203,3 +203,12 @@ Description: Set if the BIOS POST sound is played on boot. * 0 - False, * 1 - True + +What: /sys/devices/platform//mcu_powersave +Date: Apr 2024 +KernelVersion: 6.10 +Contact: "Luke Jones" +Description: + Set if the MCU can go in to low-power mode on system sleep + * 0 - False, + * 1 - True diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c index ab98f91e573c..d06d9e0c498c 100644 --- a/drivers/platform/x86/asus-wmi.c +++ b/drivers/platform/x86/asus-wmi.c @@ -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) -- 2.44.0