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Date: Wed, 4 Feb 2015 14:43:32 -0500
From: Benjamin Tissoires <benjamin.tissoires@...hat.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Hans de Goede <hdegoede@...hat.com>,
Peter Hutterer <peter.hutterer@...-t.net>,
linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] Input - synaptics: fix middle button on Lenovo 2015
products
On Feb 02 2015 or thereabouts, Dmitry Torokhov wrote:
> On Wed, Jan 28, 2015 at 03:10:04PM -0500, Benjamin Tissoires wrote:
> > 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.
> >
> > Cc: stable@...r.kernel.org
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> > ---
> > drivers/input/mouse/synaptics.c | 6 +++++-
> > 1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> > index f89de89..0d12664 100644
> > --- a/drivers/input/mouse/synaptics.c
> > +++ b/drivers/input/mouse/synaptics.c
> > @@ -689,7 +689,7 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
> >
> > if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) &&
> > ((buf[0] ^ buf[3]) & 0x02)) {
> > - switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) & ~0x01) {
> > + switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap)) {
> > default:
> > /*
> > * if nExtBtn is greater than 8 it should be
> > @@ -698,15 +698,19 @@ static int synaptics_parse_hw_state(const unsigned char buf[],
> > break;
> > case 8:
> > hw->ext_buttons |= ((buf[5] & 0x08)) ? 0x80 : 0;
> > + case 7:
> > hw->ext_buttons |= ((buf[4] & 0x08)) ? 0x40 : 0;
> > case 6:
> > hw->ext_buttons |= ((buf[5] & 0x04)) ? 0x20 : 0;
> > + case 5:
> > hw->ext_buttons |= ((buf[4] & 0x04)) ? 0x10 : 0;
> > case 4:
> > hw->ext_buttons |= ((buf[5] & 0x02)) ? 0x08 : 0;
> > + case 3:
> > hw->ext_buttons |= ((buf[4] & 0x02)) ? 0x04 : 0;
> > case 2:
> > hw->ext_buttons |= ((buf[5] & 0x01)) ? 0x02 : 0;
> > + case 1:
> > hw->ext_buttons |= ((buf[4] & 0x01)) ? 0x01 : 0;
> > }
> > }
>
> Hmm, that switch has gotten unwieldy. Maybe we can do someting like
> this:
Minus a typo, it works too.
Though I must say even if the switch is ugly, it's a no brainer to
understand what is this about. Here, it requires a little bit more
skills :)
>
> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> index a039cb7..1250a5d 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -608,6 +608,18 @@ static void synaptics_parse_agm(const unsigned char buf[],
> }
> }
>
> +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[4] & ext_mask) << ext_bits;
typo: this should read (buf[5] & ext_mask) << ext_bits; (not buf[4])
You can add my Tested-by on this one when applying.
Cheers,
Benjamin
> +}
> +
> static int synaptics_parse_hw_state(const unsigned char buf[],
> struct synaptics_data *priv,
> struct synaptics_hw_state *hw)
> @@ -692,28 +704,9 @@ 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]);
> @@ -780,6 +773,7 @@ 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);
> @@ -793,8 +787,12 @@ 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_mt_data(struct psmouse *psmouse,
>
> Thanks.
>
> --
> Dmitry
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