linux-kernel - [PATCH 3.19 35/75] Input: synaptics - do not retrieve the board id on old firmwares

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Date:	Fri, 10 Apr 2015 15:19:01 +0200
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: [PATCH 3.19 35/75] Input: synaptics - do not retrieve the board id on old firmwares

3.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Benjamin Tissoires <benjamin.tissoires@...hat.com>

commit b57a7128be24062b5b5b26032b7cd58f1651547e upstream.

The board id capability has been added in firmware 7.5.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Acked-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/input/mouse/synaptics.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -250,6 +250,10 @@ static int synaptics_board_id(struct psm
 	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];


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