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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>
This commit is contained in:
Kristian Klausen 2019-08-05 21:23:05 +02:00 committed by Andy Shevchenko
parent 02a5e9bc86
commit d507a54f58
2 changed files with 49 additions and 0 deletions
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48
drivers/platform/x86/asus-wmi.c
View File

@ -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;

1
include/linux/platform_data/x86/asus-wmi.h
View File

@ -61,6 +61,7 @@
/* Misc */
#define ASUS_WMI_DEVID_CAMERA 0x00060013
#define ASUS_WMI_CHARGE_THRESHOLD 0x00120057
/* Storage */
#define ASUS_WMI_DEVID_CARDREADER 0x00080013