hp-wmi: notify of a potential docking state change on resume

It is possible that the system gets docked or undocked while it's
suspended. Generate an input event on resume to notify user space
if there was a state change.

As it is a switch, we can generate the event unconditionally; the
input layer will only pass it on if there is an actual change.

Signed-off-by: Frans Pop <elendil@planet.nl>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 25 insertions, 0 deletions

diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
index f41135f2fb29..50d9019de2be 100644
--- a/drivers/platform/x86/hp-wmi.c
+++ b/drivers/platform/x86/hp-wmi.c
@@ -53,6 +53,7 @@ MODULE_ALIAS("wmi:5FB7F034-2C63-45e9-BE91-3D44E2C707E4");
 
 static int __init hp_wmi_bios_setup(struct platform_device *device);
 static int __exit hp_wmi_bios_remove(struct platform_device *device);
+static int hp_wmi_resume_handler(struct platform_device *device);
 
 struct bios_args {
         u32 signature;
@@ -101,6 +102,7 @@ static struct platform_driver hp_wmi_driver = {
         },
         .probe = hp_wmi_bios_setup,
         .remove = hp_wmi_bios_remove,
+        .resume = hp_wmi_resume_handler,
 };
 
 static int hp_wmi_perform_query(int query, int write, int value)
@@ -487,6 +489,29 @@ static int __exit hp_wmi_bios_remove(struct platform_device *device)
         return 0;
 }
 
+static int hp_wmi_resume_handler(struct platform_device *device)
+{
+        struct key_entry *key;
+
+        /*
+         * Docking state may have changed while suspended, so trigger
+         * an input event for the current state. As this is a switch,
+         * the input layer will only actually pass it on if the state
+         * changed.
+         */
+        for (key = hp_wmi_keymap; key->type != KE_END; key++) {
+                switch (key->type) {
+                case KE_SW:
+                        input_report_switch(hp_wmi_input_dev, key->keycode,
+                                            hp_wmi_dock_state());
+                        input_sync(hp_wmi_input_dev);
+                        break;
+                }
+        }
+
+        return 0;
+}
+
 static int __init hp_wmi_init(void)
 {
         int err;