Re: [PATCH] HID: multitouch: add support of clickpads

[Benjamin Tissoires]

On Fri, Mar 6, 2015 at 11:14 AM, Benjamin Tissoires
<benjamin.tissoires@xxxxxxxxxx> wrote:
> Touchpads that have only one button are called clickpads and should
> be advertised as such by the kernel.
>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> ---
>
> Hi,
>
> this has been on my local tree for nearly a year now, but I never really
> managed to take the time to make it working properly.
> Jason raised the subject yesterday, so I finally had a look and fixed the
> last bugs.

Sorry, wrong Jason :)

Meanwhile, Jason reported that it fixed his problem:
Tested-by: Jason Ekstrand <jason@xxxxxxxxxxxxxx>

cheers,
Benjamin

>
> All the current touchscreens I have the logs are not showing INPUT_PROP_BUTTONPAD
> as expected, so I think this should be fine to go upstream.
>
> Cheers,
> Benjamin
>
>  drivers/hid/hid-multitouch.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index b61715f..a8bec33 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -115,6 +115,7 @@ struct mt_device {
>         __u8 touches_by_report; /* how many touches are present in one report:
>                                 * 1 means we should use a serial protocol
>                                 * > 1 means hybrid (multitouch) protocol */
> +       __u8 buttons_count;     /* number of physical buttons per touchpad */
>         bool serial_maybe;      /* need to check for serial protocol */
>         bool curvalid;          /* is the current contact valid? */
>         unsigned mt_flags;      /* flags to pass to input-mt */
> @@ -378,6 +379,10 @@ static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
>                 td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
>         }
>
> +       /* count the buttons on touchpads */
> +       if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
> +               td->buttons_count++;
> +
>         if (usage->usage_index)
>                 prev_usage = &field->usage[usage->usage_index - 1];
>
> @@ -727,6 +732,10 @@ static void mt_touch_input_configured(struct hid_device *hdev,
>         if (cls->quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
>                 td->mt_flags |= INPUT_MT_DROP_UNUSED;
>
> +       /* check for clickpads */
> +       if ((td->mt_flags & INPUT_MT_POINTER) && (td->buttons_count == 1))
> +               __set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
> +
>         input_mt_init_slots(input, td->maxcontacts, td->mt_flags);
>
>         td->mt_flags = 0;
> --
> 2.1.0
>
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