Commit d507a54f authored by Kristian Klausen's avatar Kristian Klausen Committed by Andy Shevchenko
Browse files

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: default avatarKristian Klausen <kristian@klausen.dk>
Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
parent 02a5e9bc

drivers/platform/x86/asus-wmi.c

+48 −0
Original line number Diff line number Diff line
@@ -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;

include/linux/platform_data/x86/asus-wmi.h

+1 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ 


/* Misc */

#define ASUS_WMI_DEVID_CAMERA		0x00060013

#define ASUS_WMI_CHARGE_THRESHOLD	0x00120057



/* Storage */

#define ASUS_WMI_DEVID_CARDREADER	0x00080013