Huawei Matebook laptops uses Fn key and toggle to access F1-F12 keys.
Along with that, there is this feature called fn-lock that inverts the
behavior of this Fn key and the F1-F12 row.
Signed-off-by: Ayman Bagabas <ayman.bagabas@xxxxxxxxx>
---
drivers/platform/x86/huawei-wmi.c | 85 +++++++++++++++++++++++++++++++
1 file changed, 85 insertions(+)
diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
index 4ca1a6896766..8fc11a296357 100644
--- a/drivers/platform/x86/huawei-wmi.c
+++ b/drivers/platform/x86/huawei-wmi.c
@@ -59,6 +59,7 @@ struct huawei_wmi_debug {
struct huawei_wmi {
bool battery_available;
+ bool fn_lock_available;
struct huawei_wmi_debug debug;
struct input_dev *idev[2];
@@ -515,6 +516,88 @@ static void huawei_wmi_battery_exit(struct device *dev)
}
}
+/* Fn lock */
+
+static int huawei_wmi_fn_lock_get(int *on)
+{
+ u8 ret[0x100] = { 0 };
+ int err, i;
+
+ err = huawei_wmi_cmd(FN_LOCK_GET, ret, 0x100);
+ if (err)
+ return err;
+
+ /* Find the first non-zero value. Return status is ignored. */
+ i = 1;
+ do {
+ if (on)
+ *on = ret[i] - 1; // -1 undefined, 0 off, 1 on.
+ } while (i < 0x100 && !ret[i++]);
+
+ return 0;
+}
+
+static int huawei_wmi_fn_lock_set(int on)
+{
+ union hwmi_arg arg;
+
+ arg.cmd = FN_LOCK_SET;
+ arg.args[2] = on + 1; // 0 undefined, 1 off, 2 on.
+
+ return huawei_wmi_cmd(arg.cmd, NULL, 0);
+}
+
+static ssize_t fn_lock_state_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int err, on;
+
+ err = huawei_wmi_fn_lock_get(&on);
+ if (err)
+ return err;
+
+ return sprintf(buf, "%d\n", on);
+}
+
+static ssize_t fn_lock_state_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ int on, err;
+
+ if (kstrtoint(buf, 10, &on) ||
+ on < 0 || on > 1)
+ return -EINVAL;
+
+ err = huawei_wmi_fn_lock_set(on);
+ if (err)
+ return err;
+
+ return size;
+}
+
+static DEVICE_ATTR_RW(fn_lock_state);
+
+static void huawei_wmi_fn_lock_setup(struct device *dev)
+{
+ struct huawei_wmi *huawei = dev_get_drvdata(dev);
+
+ huawei->fn_lock_available = true;
+ if (huawei_wmi_fn_lock_get(NULL)) {
+ huawei->fn_lock_available = false;
+ return;
+ }
+
+ device_create_file(dev, &dev_attr_fn_lock_state);
+}
+
+static void huawei_wmi_fn_lock_exit(struct device *dev)
+{
+ if (huawei_wmi->fn_lock_available)
+ device_remove_file(dev, &dev_attr_fn_lock_state);
+}
+
/* Input */
static void huawei_wmi_process_key(struct input_dev *idev, int code)
@@ -638,6 +721,7 @@ static int huawei_wmi_probe(struct platform_device *pdev)
mutex_init(&huawei_wmi->battery_lock);
huawei_wmi_leds_setup(&pdev->dev);
+ huawei_wmi_fn_lock_setup(&pdev->dev);
huawei_wmi_battery_setup(&pdev->dev);
}
@@ -657,6 +741,7 @@ static int huawei_wmi_remove(struct platform_device *pdev)
if (wmi_has_guid(HWMI_METHOD_GUID)) {
huawei_wmi_battery_exit(&pdev->dev);
+ huawei_wmi_fn_lock_exit(&pdev->dev);
}
return 0;
--
2.21.0
