34 lines
1.1 KiB
Diff
34 lines
1.1 KiB
Diff
From: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Date: Sun, 8 Mar 2015 22:33:36 -0700
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Subject: [PATCH] Input: synaptics - do not retrieve the board id on old
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firmwares
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The board id capability has been added in firmware 7.5.
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Cc: stable@vger.kernel.org
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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
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Acked-by: Hans de Goede <hdegoede@redhat.com>
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Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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---
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drivers/input/mouse/synaptics.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
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index bd399a72e610..ff352ecca394 100644
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--- a/drivers/input/mouse/synaptics.c
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+++ b/drivers/input/mouse/synaptics.c
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@@ -253,6 +253,10 @@ static int synaptics_board_id(struct psmouse *psmouse)
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struct synaptics_data *priv = psmouse->private;
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unsigned char bid[3];
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+ /* firmwares prior 7.5 have no board_id encoded */
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+ if (SYN_ID_FULL(priv->identity) < 0x705)
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+ return 0;
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+
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if (synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid))
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return -1;
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priv->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
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--
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2.1.0
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