Commit 1021dcf1 authored by Anson Huang's avatar Anson Huang Committed by Dmitry Torokhov

Input: imx_sc_key - only take the valid data from SCU firmware as key state

When reading key state from SCU, the response data from SCU firmware
is 4 bytes due to MU message protocol, but ONLY the first byte is the
key state, other 3 bytes could be some dirty data, so we should ONLY
take the first byte as key state to avoid reporting incorrect state.
Signed-off-by: default avatarAnson Huang <Anson.Huang@nxp.com>
Fixes: 688f1dfb ("Input: keyboard - imx_sc: Add i.MX system controller key support")
Link: https://lore.kernel.org/r/1576202909-1661-1-git-send-email-Anson.Huang@nxp.comSigned-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent cb222aed
...@@ -78,7 +78,13 @@ static void imx_sc_check_for_events(struct work_struct *work) ...@@ -78,7 +78,13 @@ static void imx_sc_check_for_events(struct work_struct *work)
return; return;
} }
state = (bool)msg.state; /*
* The response data from SCU firmware is 4 bytes,
* but ONLY the first byte is the key state, other
* 3 bytes could be some dirty data, so we should
* ONLY take the first byte as key state.
*/
state = (bool)(msg.state & 0xff);
if (state ^ priv->keystate) { if (state ^ priv->keystate) {
priv->keystate = state; priv->keystate = state;
......
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