asus-wmi: Add callback for hotkey filtering

This is required for the T101MT home key, which behaves differently
than other hotkeys.

Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

2 files changed, 17 insertions, 1 deletions

diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
index bcb9fb41ddc..cea9fdcad64 100644
--- a/drivers/platform/x86/asus-wmi.c
+++ b/drivers/platform/x86/asus-wmi.c
@@ -1061,6 +1061,8 @@ static void asus_wmi_notify(u32 value, void *context)
         acpi_status status;
         int code;
         int orig_code;
+        unsigned int key_value = 1;
+        bool autorelease = 1;
 
         status = wmi_get_event_data(value, &response);
         if (status != AE_OK) {
@@ -1076,6 +1078,13 @@ static void asus_wmi_notify(u32 value, void *context)
         code = obj->integer.value;
         orig_code = code;
 
+        if (asus->driver->key_filter) {
+                asus->driver->key_filter(asus->driver, &code, &key_value,
+                                         &autorelease);
+                if (code == ASUS_WMI_KEY_IGNORE)
+                        goto exit;
+        }
+
         if (code >= NOTIFY_BRNUP_MIN && code <= NOTIFY_BRNUP_MAX)
                 code = NOTIFY_BRNUP_MIN;
         else if (code >= NOTIFY_BRNDOWN_MIN &&
@@ -1085,7 +1094,8 @@ static void asus_wmi_notify(u32 value, void *context)
         if (code == NOTIFY_BRNUP_MIN || code == NOTIFY_BRNDOWN_MIN) {
                 if (!acpi_video_backlight_support())
                         asus_wmi_backlight_notify(asus, orig_code);
-        } else if (!sparse_keymap_report_event(asus->inputdev, code, 1, true))
+        } else if (!sparse_keymap_report_event(asus->inputdev, code,
+                                               key_value, autorelease))
                 pr_info("Unknown key %x pressed\n", code);
 
 exit:
diff --git a/drivers/platform/x86/asus-wmi.h b/drivers/platform/x86/asus-wmi.h
index c044522c876..4da61033bcb 100644
--- a/drivers/platform/x86/asus-wmi.h
+++ b/drivers/platform/x86/asus-wmi.h
@@ -29,6 +29,8 @@
 
 #include <linux/platform_device.h>
 
+#define ASUS_WMI_KEY_IGNORE (-1)
+
 struct module;
 struct key_entry;
 struct asus_wmi;
@@ -44,6 +46,10 @@ struct asus_wmi_driver {
         const struct key_entry  *keymap;
         const char              *input_name;
         const char              *input_phys;
+        /* Returns new code, value, and autorelease values in arguments.
+         * Return ASUS_WMI_KEY_IGNORE in code if event should be ignored. */
+        void (*key_filter) (struct asus_wmi_driver *driver, int *code,
+                            unsigned int *value, bool *autorelease);
 
         int (*probe) (struct platform_device *device);
         void (*quirks) (struct asus_wmi_driver *driver);