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platform/x86: asus-wmi: Add support for charge threshold
Most newer ASUS laptops supports limiting the battery charge level, which help prolonging the battery life. Tested on a Zenbook UX430UNR. Signed-off-by: Kristian Klausen <kristian@klausen.dk> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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02a5e9bc86
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@ -195,6 +195,8 @@ struct asus_wmi {
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u8 fan_boost_mode_mask;
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u8 fan_boost_mode;
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int charge_threshold;
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struct hotplug_slot hotplug_slot;
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struct mutex hotplug_lock;
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struct mutex wmi_lock;
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@ -2075,6 +2077,43 @@ static ssize_t cpufv_store(struct device *dev, struct device_attribute *attr,
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static DEVICE_ATTR_WO(cpufv);
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static ssize_t charge_threshold_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct asus_wmi *asus = dev_get_drvdata(dev);
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int value, ret, rv;
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ret = kstrtouint(buf, 10, &value);
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if (!count || ret != 0)
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return -EINVAL;
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if (value < 0 || value > 100)
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return -EINVAL;
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asus_wmi_set_devstate(ASUS_WMI_CHARGE_THRESHOLD, value, &rv);
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if (rv != 1)
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return -EIO;
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/* There isn't any method in the DSDT to read the threshold, so we
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* save the threshold.
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*/
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asus->charge_threshold = value;
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return count;
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}
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static ssize_t charge_threshold_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct asus_wmi *asus = dev_get_drvdata(dev);
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return sprintf(buf, "%d\n", asus->charge_threshold);
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}
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static DEVICE_ATTR_RW(charge_threshold);
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static struct attribute *platform_attributes[] = {
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&dev_attr_cpufv.attr,
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&dev_attr_camera.attr,
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@ -2083,6 +2122,7 @@ static struct attribute *platform_attributes[] = {
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&dev_attr_lid_resume.attr,
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&dev_attr_als_enable.attr,
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&dev_attr_fan_boost_mode.attr,
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&dev_attr_charge_threshold.attr,
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NULL
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};
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@ -2106,6 +2146,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj,
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devid = ASUS_WMI_DEVID_ALS_ENABLE;
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else if (attr == &dev_attr_fan_boost_mode.attr)
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ok = asus->fan_boost_mode_available;
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else if (attr == &dev_attr_charge_threshold.attr)
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devid = ASUS_WMI_CHARGE_THRESHOLD;
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if (devid != -1)
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ok = !(asus_wmi_get_devstate_simple(asus, devid) < 0);
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@ -2434,6 +2476,12 @@ static int asus_wmi_add(struct platform_device *pdev)
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}
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asus_wmi_debugfs_init(asus);
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/* The charge threshold is only reset when the system is power cycled,
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* and we can't get the current threshold so let set it to 100% on
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* module load.
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*/
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asus_wmi_set_devstate(ASUS_WMI_CHARGE_THRESHOLD, 100, NULL);
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asus->charge_threshold = 100;
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return 0;
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@ -61,6 +61,7 @@
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/* Misc */
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#define ASUS_WMI_DEVID_CAMERA 0x00060013
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#define ASUS_WMI_CHARGE_THRESHOLD 0x00120057
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/* Storage */
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#define ASUS_WMI_DEVID_CARDREADER 0x00080013
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