[RFC] Reporting "orientation changed" event

[Anisse Astier <anisse@astier.eu>]

Pegatron Lucid tablet sends an ACPI hotkey event(0xEA) when the
accelerometer detects coarse orientation change. My initial thought was
to just translate this event into KEY_DIRECTION, which seems to be the
norm from what we can see in hp-wmi driver. (See patch below for an
implementation.)

But this isn't just a key per se like on the HP touchsmart tablet, this
is an event that is triggered when the device is rotated.

This could be defined as a new Misc (EV_MSC) event:
MSC_ORIENTATION_CHANGED ?

Or we could use the upcoming IIO subsystem which is supposed to be for
sensors, but then we'd have a mismatch between the device based on ACPI
with firmware in the middle (driver submitted by Andy Ross) and the
purpose of IIO ("SPI or I2C device").


Maybe I'm over-thinking this and this might be just right:

From: Anisse Astier <anisse@astier.eu>
Subject: [PATCH RFC] asus-laptop: Send input key for tablet rotation on Pegatron Lucid Tablet

Pegatron Lucid tablet sends ACPI event on coarse orientation changes.
Translate this into KEY_DIRECTION input event.

Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Andy Ross <andy.ross@windriver.com>
Cc: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Anisse Astier <anisse@astier.eu>
---
Please note that this patch depends on Andy Ross's first patch in order for
asus-laptop to bind with the tablet.

Regards,

Anisse
---
 drivers/platform/x86/asus-laptop.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
index 5c23b20..decb958 100644
--- a/drivers/platform/x86/asus-laptop.c
+++ b/drivers/platform/x86/asus-laptop.c
@@ -312,6 +312,8 @@ static const struct key_entry asus_keymap[] = {
 	{KE_KEY, 0xc4, { KEY_KBDILLUMUP } },
 	{KE_KEY, 0xc5, { KEY_KBDILLUMDOWN } },
 	{KE_KEY, 0xb5, { KEY_CALC } },
+	/* Pegatron Lucid tablet specific */
+	{KE_KEY, 0xEA, { KEY_DIRECTION } }, /* Orientation changed */
 	{KE_END, 0},
 };
 
-- 
1.7.3.2