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Subject[PATCH 3.16.y-ckt 030/144] Input: synaptics - fix middle button on Lenovo 2015 products
Date
3.16.7-ckt10 -stable review patch.  If anyone has any objections, please let me know.

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

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

commit dc5465dc8a6d5cae8a0e1d8826bdcb2e4cb261ab upstream.

On the X1 Carbon 3rd gen (with a 2015 broadwell cpu), the physical middle
button of the trackstick (attached to the touchpad serio device, of course)
seems to get lost.

Actually, the touchpads reports 3 extra buttons, which falls in the switch
below to the '2' case. Let's handle the case of odd numbers also, so that
the middle button finds its way back.

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>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
drivers/input/mouse/synaptics.c | 44 ++++++++++++++++++++---------------------
1 file changed, 21 insertions(+), 23 deletions(-)

diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
index 5d9e1cba62c0..f958a231a24f 100644
--- a/drivers/input/mouse/synaptics.c
+++ b/drivers/input/mouse/synaptics.c
@@ -656,6 +656,18 @@ static void synaptics_parse_agm(const unsigned char buf[],
priv->agm_pending = true;
}

+static void synaptics_parse_ext_buttons(const unsigned char buf[],
+ struct synaptics_data *priv,
+ struct synaptics_hw_state *hw)
+{
+ unsigned int ext_bits =
+ (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) + 1) >> 1;
+ unsigned int ext_mask = GENMASK(ext_bits - 1, 0);
+
+ hw->ext_buttons = buf[4] & ext_mask;
+ hw->ext_buttons |= (buf[5] & ext_mask) << ext_bits;
+}
+
static bool is_forcepad;

static int synaptics_parse_hw_state(const unsigned char buf[],
@@ -742,28 +754,9 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
}

- if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) &&
+ if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) > 0 &&
((buf[0] ^ buf[3]) & 0x02)) {
- switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) & ~0x01) {
- default:
- /*
- * if nExtBtn is greater than 8 it should be
- * considered invalid and treated as 0
- */
- break;
- case 8:
- hw->ext_buttons |= ((buf[5] & 0x08)) ? 0x80 : 0;
- hw->ext_buttons |= ((buf[4] & 0x08)) ? 0x40 : 0;
- case 6:
- hw->ext_buttons |= ((buf[5] & 0x04)) ? 0x20 : 0;
- hw->ext_buttons |= ((buf[4] & 0x04)) ? 0x10 : 0;
- case 4:
- hw->ext_buttons |= ((buf[5] & 0x02)) ? 0x08 : 0;
- hw->ext_buttons |= ((buf[4] & 0x02)) ? 0x04 : 0;
- case 2:
- hw->ext_buttons |= ((buf[5] & 0x01)) ? 0x02 : 0;
- hw->ext_buttons |= ((buf[4] & 0x01)) ? 0x01 : 0;
- }
+ synaptics_parse_ext_buttons(buf, priv, hw);
}
} else {
hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
@@ -830,6 +823,7 @@ static void synaptics_report_buttons(struct psmouse *psmouse,
{
struct input_dev *dev = psmouse->dev;
struct synaptics_data *priv = psmouse->private;
+ int ext_bits = (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) + 1) >> 1;
int i;

input_report_key(dev, BTN_LEFT, hw->left);
@@ -843,8 +837,12 @@ static void synaptics_report_buttons(struct psmouse *psmouse,
input_report_key(dev, BTN_BACK, hw->down);
}

- for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
- input_report_key(dev, BTN_0 + i, hw->ext_buttons & (1 << i));
+ for (i = 0; i < ext_bits; i++) {
+ input_report_key(dev, BTN_0 + 2 * i,
+ hw->ext_buttons & (1 << i));
+ input_report_key(dev, BTN_1 + 2 * i,
+ hw->ext_buttons & (1 << (i + ext_bits)));
+ }
}

static void synaptics_report_slot(struct input_dev *dev, int slot,

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