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authorBarnabás Pőcze <pobrn@protonmail.com>2021-02-04 00:57:13 +0300
committerHans de Goede <hdegoede@redhat.com>2021-02-04 12:21:43 +0300
commit6b49dea4fd9c539f5fea61f6a203ec1349292a26 (patch)
tree66adafd36fe512a52e2e7b3a44cbfcde326f1269 /drivers/platform
parent503325f84bc0ee3a07b0831ee59d6eae84cfa695 (diff)
downloadlinux-6b49dea4fd9c539f5fea61f6a203ec1349292a26.tar.xz
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>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/x86/ideapad-laptop.c65
1 files changed, 56 insertions, 9 deletions
diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
index 24dcb4ad75ef..6cb5ad4be231 100644
--- a/drivers/platform/x86/ideapad-laptop.c
+++ b/drivers/platform/x86/ideapad-laptop.c
@@ -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;
}
}
}