On Fri, Feb 06, 2015 at 03:04:34PM -0500, Benjamin Tissoires wrote:
> The 2015 series of the Lenovo thinkpads added back the hardware buttons
> on top of the touchpad for the trackstick.
>
> Unfortunately, they are wired to the touchpad, and not the trackstick.
> Thus, they are seen as extra buttons from the kernel point of view.
>
> This leads to a problem in user space because extra buttons on synaptics
> devices used to be used as scroll up/down buttons. So in the end, the
> experience for the user is scroll events for buttons left and right
> when using the trackstick. Yay!
>
> Fortunatelly, the firmware advertizes such behavior in the extended
> capability $10, and so we can re-route the buttons through the
> pass-through interface.
>
> Hallelujah-expressed-by: Peter Hutterer <peter.hutterer@xxxxxxxxx>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> ---
>
> v2:
> - forward only 3 extra buttons, not the whole array. The PS/2 base protocol
> handles only 3 buttons, so giving more than 3 will mess up REL_X and REL_Y.
> - rely on SYN_CAP_EXT_BUTTONS_STICK to know if the re-routing has to be put in
> place or not
>
> drivers/input/mouse/synaptics.c | 45 +++++++++++++++++++++++++++++++----------
> drivers/input/mouse/synaptics.h | 5 +++++
> 2 files changed, 39 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
> index 79c4a87..dfe8235 100644
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -585,18 +585,20 @@ static int synaptics_is_pt_packet(unsigned char *buf)
> return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
> }
>
> -static void synaptics_pass_pt_packet(struct serio *ptport, unsigned char *packet)
> +static void synaptics_pass_pt_packet(struct psmouse *psmouse,
> + struct serio *ptport, unsigned char *packet)
> {
> + struct synaptics_data *priv = psmouse->private;
> struct psmouse *child = serio_get_drvdata(ptport);
>
> if (child && child->state == PSMOUSE_ACTIVATED) {
> - serio_interrupt(ptport, packet[1], 0);
> + serio_interrupt(ptport, packet[1] | priv->pt_buttons, 0);
> serio_interrupt(ptport, packet[4], 0);
> serio_interrupt(ptport, packet[5], 0);
> if (child->pktsize == 4)
> serio_interrupt(ptport, packet[2], 0);
> } else
> - serio_interrupt(ptport, packet[1], 0);
> + serio_interrupt(ptport, packet[1] | priv->pt_buttons, 0);
We only need to pass the button state when trackpad is activated, not
when we are querying the device.
> }
>
> static void synaptics_pt_activate(struct psmouse *psmouse)
> @@ -842,6 +844,7 @@ static void synaptics_report_ext_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;
> + char buf[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
> int i;
>
> if (!SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap))
> @@ -852,12 +855,30 @@ static void synaptics_report_ext_buttons(struct psmouse *psmouse,
> !((psmouse->packet[0] ^ psmouse->packet[3]) & 0x02))
> return;
>
> - 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)));
> + if (!SYN_CAP_EXT_BUTTONS_STICK(priv->ext_cap_10)) {
> + 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)));
> + }
> + return;
> }
> +
> + /*
> + * This generation of touchpads has the trackstick buttons
> + * physically wired to the touchpad. Re-route them through
> + * the pass-through interface.
> + */
> + if (!priv->pt_port)
> + return;
> +
> + /* the trackstick expects at most 3 buttons */
> + priv->pt_buttons = SYN_CAP_EXT_BUTTON_STICK_L(hw->ext_buttons) |
> + SYN_CAP_EXT_BUTTON_STICK_R(hw->ext_buttons) << 1 |
> + SYN_CAP_EXT_BUTTON_STICK_M(hw->ext_buttons) << 2;
> +
> + synaptics_pass_pt_packet(psmouse, priv->pt_port, buf);
> }
>
> static void synaptics_report_buttons(struct psmouse *psmouse,
> @@ -1098,7 +1119,8 @@ static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
> if (SYN_CAP_PASS_THROUGH(priv->capabilities) &&
> synaptics_is_pt_packet(psmouse->packet)) {
> if (priv->pt_port)
> - synaptics_pass_pt_packet(priv->pt_port, psmouse->packet);
> + synaptics_pass_pt_packet(psmouse, priv->pt_port,
> + psmouse->packet);
> } else
> synaptics_process_packet(psmouse);
>
> @@ -1200,8 +1222,9 @@ static void set_input_params(struct psmouse *psmouse,
> __set_bit(BTN_BACK, dev->keybit);
> }
>
> - for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
> - __set_bit(BTN_0 + i, dev->keybit);
> + if (!SYN_CAP_EXT_BUTTONS_STICK(priv->ext_cap_10))
> + for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
> + __set_bit(BTN_0 + i, dev->keybit);
>
> __clear_bit(EV_REL, dev->evbit);
> __clear_bit(REL_X, dev->relbit);
> diff --git a/drivers/input/mouse/synaptics.h b/drivers/input/mouse/synaptics.h
> index 9723092..8102a72 100644
> --- a/drivers/input/mouse/synaptics.h
> +++ b/drivers/input/mouse/synaptics.h
> @@ -111,6 +111,10 @@
> #define SYN_CAP_EXT_BUTTONS_STICK(ex10) ((ex10) & 0x010000)
> #define SYN_CAP_SECUREPAD(ex10) ((ex10) & 0x020000)
>
> +#define SYN_CAP_EXT_BUTTON_STICK_L(eb) (!!((eb) & 0x01))
> +#define SYN_CAP_EXT_BUTTON_STICK_M(eb) (!!((eb) & 0x02))
> +#define SYN_CAP_EXT_BUTTON_STICK_R(eb) (!!((eb) & 0x04))
> +
> /* synaptics modes query bits */
> #define SYN_MODE_ABSOLUTE(m) ((m) & (1 << 7))
> #define SYN_MODE_RATE(m) ((m) & (1 << 6))
> @@ -179,6 +183,7 @@ struct synaptics_data {
> bool disable_gesture; /* disable gestures */
>
> struct serio *pt_port; /* Pass-through serio port */
> + unsigned char pt_buttons; /* Pass-through buttons */
>
> /*
> * Last received Advanced Gesture Mode (AGM) packet. An AGM packet
> --
> 2.1.0
>
--
Dmitry
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