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platform/x86: ideapad-laptop: add "always on USB charging" control support 

Certain models have a so-called "always on USB charging" feature,
which enables USB charging even when the computer is turned off
or suspended, and which may be controlled/queried using the
SALS/HALS ACPI methods. Expose this functionality via a new device
attribute (usb_charging). Tested on: Lenovo YOGA 520-14IKB 80X8

Signed-off-by: Barnabás Pőcze <pobrn@protonmail.com>
Link: https://lore.kernel.org/r/20210203215403.290792-28-pobrn@protonmail.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Barnabás Pőcze 2021-02-03 21:57:13 +00:00 committed by Hans de Goede
parent 503325f84b
commit 6b49dea4fd
2 changed files with 65 additions and 9 deletions
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9
Documentation/ABI/testing/sysfs-platform-ideapad-laptop
View File

@ -41,3 +41,12 @@ Description:
# echo "0" > \
/sys/bus/pci/devices/0000:00:1f.0/PNP0C09:00/VPC2004:00/fn_lock
What: /sys/bus/platform/devices/VPC2004:*/usb_charging
Date: Feb 2021
KernelVersion: 5.12
Contact: platform-driver-x86@vger.kernel.org
Description:
Controls whether the "always on USB charging" feature is
enabled or not. This feature enables charging USB devices
even if the computer is not turned on.

65
drivers/platform/x86/ideapad-laptop.c
View File

@ -62,18 +62,22 @@ enum {
};
enum {
HALS_KBD_BL_SUPPORT_BIT = 4,
HALS_KBD_BL_STATE_BIT = 5,
HALS_FNLOCK_SUPPORT_BIT = 9,
HALS_FNLOCK_STATE_BIT = 10,
HALS_HOTKEYS_PRIMARY_BIT = 11,
HALS_KBD_BL_SUPPORT_BIT = 4,
HALS_KBD_BL_STATE_BIT = 5,
HALS_USB_CHARGING_SUPPORT_BIT = 6,
HALS_USB_CHARGING_STATE_BIT = 7,
HALS_FNLOCK_SUPPORT_BIT = 9,
HALS_FNLOCK_STATE_BIT = 10,
HALS_HOTKEYS_PRIMARY_BIT = 11,
};
enum {
SALS_KBD_BL_ON = 0x8,
SALS_KBD_BL_OFF = 0x9,
SALS_FNLOCK_ON = 0xe,
SALS_FNLOCK_OFF = 0xf,
SALS_KBD_BL_ON = 0x8,
SALS_KBD_BL_OFF = 0x9,
SALS_USB_CHARGING_ON = 0xa,
SALS_USB_CHARGING_OFF = 0xb,
SALS_FNLOCK_ON = 0xe,
SALS_FNLOCK_OFF = 0xf,
};
enum {
@ -134,6 +138,7 @@ struct ideapad_private {
bool hw_rfkill_switch : 1;
bool kbd_bl : 1;
bool touchpad_ctrl_via_ec : 1;
bool usb_charging : 1;
} features;
struct {
bool initialized;
@ -592,12 +597,49 @@ static ssize_t touchpad_store(struct device *dev,
static DEVICE_ATTR_RW(touchpad);
static ssize_t usb_charging_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ideapad_private *priv = dev_get_drvdata(dev);
unsigned long hals;
int err;
err = eval_hals(priv->adev->handle, &hals);
if (err)
return err;
return sysfs_emit(buf, "%d\n", !!test_bit(HALS_USB_CHARGING_STATE_BIT, &hals));
}
static ssize_t usb_charging_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct ideapad_private *priv = dev_get_drvdata(dev);
bool state;
int err;
err = kstrtobool(buf, &state);
if (err)
return err;
err = exec_sals(priv->adev->handle, state ? SALS_USB_CHARGING_ON : SALS_USB_CHARGING_OFF);
if (err)
return err;
return count;
}
static DEVICE_ATTR_RW(usb_charging);
static struct attribute *ideapad_attributes[] = {
&dev_attr_camera_power.attr,
&dev_attr_conservation_mode.attr,
&dev_attr_fan_mode.attr,
&dev_attr_fn_lock.attr,
&dev_attr_touchpad.attr,
&dev_attr_usb_charging.attr,
NULL
};
@ -620,6 +662,8 @@ static umode_t ideapad_is_visible(struct kobject *kobj,
else if (attr == &dev_attr_touchpad.attr)
supported = priv->features.touchpad_ctrl_via_ec &&
test_bit(CFG_CAP_TOUCHPAD_BIT, &priv->cfg);
else if (attr == &dev_attr_usb_charging.attr)
supported = priv->features.usb_charging;
return supported ? attr->mode : 0;
}
@ -1459,6 +1503,9 @@ static void ideapad_check_features(struct ideapad_private *priv)
if (test_bit(HALS_KBD_BL_SUPPORT_BIT, &val))
priv->features.kbd_bl = true;
if (test_bit(HALS_USB_CHARGING_SUPPORT_BIT, &val))
priv->features.usb_charging = true;
}
}
}