diff options
author | Kristian Klausen <kristian@klausen.dk> | 2019-08-05 21:23:05 +0200 |
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committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2019-08-16 12:38:48 +0300 |
commit | d507a54f5865d8dcbdd16c66a1a2da15640878ca (patch) | |
tree | f059fc9505ce86bb16fa8cfe6ac5168037c461d2 /drivers/platform/x86 | |
parent | 02a5e9bc86dee8c7698ac2cfd9e29650eb318442 (diff) | |
download | linux-d507a54f5865d8dcbdd16c66a1a2da15640878ca.tar.bz2 |
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>
Diffstat (limited to 'drivers/platform/x86')
-rw-r--r-- | drivers/platform/x86/asus-wmi.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c index 34dfbed65332..22ae350e0a96 100644 --- a/drivers/platform/x86/asus-wmi.c +++ b/drivers/platform/x86/asus-wmi.c @@ -195,6 +195,8 @@ struct asus_wmi { u8 fan_boost_mode_mask; u8 fan_boost_mode; + int charge_threshold; + struct hotplug_slot hotplug_slot; struct mutex hotplug_lock; struct mutex wmi_lock; @@ -2075,6 +2077,43 @@ static ssize_t cpufv_store(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR_WO(cpufv); + +static ssize_t charge_threshold_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct asus_wmi *asus = dev_get_drvdata(dev); + int value, ret, rv; + + ret = kstrtouint(buf, 10, &value); + + if (!count || ret != 0) + return -EINVAL; + if (value < 0 || value > 100) + return -EINVAL; + + asus_wmi_set_devstate(ASUS_WMI_CHARGE_THRESHOLD, value, &rv); + + if (rv != 1) + return -EIO; + + /* There isn't any method in the DSDT to read the threshold, so we + * save the threshold. + */ + asus->charge_threshold = value; + return count; +} + +static ssize_t charge_threshold_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct asus_wmi *asus = dev_get_drvdata(dev); + + return sprintf(buf, "%d\n", asus->charge_threshold); +} + +static DEVICE_ATTR_RW(charge_threshold); + static struct attribute *platform_attributes[] = { &dev_attr_cpufv.attr, &dev_attr_camera.attr, @@ -2083,6 +2122,7 @@ static struct attribute *platform_attributes[] = { &dev_attr_lid_resume.attr, &dev_attr_als_enable.attr, &dev_attr_fan_boost_mode.attr, + &dev_attr_charge_threshold.attr, NULL }; @@ -2106,6 +2146,8 @@ static umode_t asus_sysfs_is_visible(struct kobject *kobj, devid = ASUS_WMI_DEVID_ALS_ENABLE; else if (attr == &dev_attr_fan_boost_mode.attr) ok = asus->fan_boost_mode_available; + else if (attr == &dev_attr_charge_threshold.attr) + devid = ASUS_WMI_CHARGE_THRESHOLD; if (devid != -1) ok = !(asus_wmi_get_devstate_simple(asus, devid) < 0); @@ -2434,6 +2476,12 @@ static int asus_wmi_add(struct platform_device *pdev) } asus_wmi_debugfs_init(asus); + /* The charge threshold is only reset when the system is power cycled, + * and we can't get the current threshold so let set it to 100% on + * module load. + */ + asus_wmi_set_devstate(ASUS_WMI_CHARGE_THRESHOLD, 100, NULL); + asus->charge_threshold = 100; return 0; |