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From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Date: Sun, 8 Mar 2015 22:33:36 -0700
Subject: [PATCH] Input: synaptics - do not retrieve the board id on old
firmwares
The board id capability has been added in firmware 7.5.
Cc: stable@vger.kernel.org
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
drivers/input/mouse/synaptics.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 2f42a712f3e0..2176874a41b1 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -250,6 +250,10 @@ static int synaptics_board_id(struct psmouse *psmouse)
struct synaptics_data *priv = psmouse->private;
unsigned char bid[3];
+ /* firmwares prior 7.5 have no board_id encoded */
+ if (SYN_ID_FULL(priv->identity) < 0x705)
+ return 0;
+
if (synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid))
return -1;
priv->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
--
2.1.0
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