Re: [PATCH] Input: elan: enable middle button of touchpads on ThinkPad P52

[Aaron Ma <aaron.ma@canonical.com>]

On 06/19/2018 08:21 PM, Benjamin Tissoires wrote:
> On Tue, Jun 12, 2018 at 9:10 AM Aaron Ma <aaron.ma@canonical.com> wrote:
>> PNPID is better way to identify the type of touchpads.
>> Enable middle button support on 2 types of touchpads on Lenovo P52.
>>
>> Cc: stable@vger.kernel.org
>> Cc: KT Liao <kt.liao@emc.com.tw>
>> Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
>> ---
>>  drivers/input/mouse/elantech.c | 9 ++++++++-
>>  1 file changed, 8 insertions(+), 1 deletion(-)
> Looks good to me:
> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> 
> Aaron, our internal tests show that the P52 shows a lot of lost
> synchronization in pre-v4.18 kernels. Do you have a fix for that too?
> 

https://lkml.org/lkml/2018/5/28/694
should fix the sync issue.


> In v4.18 we need to fix the elan_i2c module as right now the touchpad
> is muted when booted with such a kernel.

Does this touchpad support elan_i2c?

Regards,
Aaron

> 
> Cheers,
> Benjamin
> 
>> diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
>> index fb4d902c4403..67b061dd4494 100644
>> --- a/drivers/input/mouse/elantech.c
>> +++ b/drivers/input/mouse/elantech.c
>> @@ -1175,6 +1175,12 @@ static const struct dmi_system_id elantech_dmi_has_middle_button[] = {
>>         { }
>>  };
>>
>> +static const char * const middle_button_pnp_ids[] = {
>> +       "LEN2131", /* ThinkPad P52 w/ NFC */
>> +       "LEN2132", /* ThinkPad P52 */
>> +       NULL
>> +};
>> +
>>  /*
>>   * Set the appropriate event bits for the input subsystem
>>   */
>> @@ -1194,7 +1200,8 @@ static int elantech_set_input_params(struct psmouse *psmouse)
>>         __clear_bit(EV_REL, dev->evbit);
>>
>>         __set_bit(BTN_LEFT, dev->keybit);
>> -       if (dmi_check_system(elantech_dmi_has_middle_button))
>> +       if (dmi_check_system(elantech_dmi_has_middle_button) ||
>> +               psmouse_matches_pnp_id(psmouse, middle_button_pnp_ids))
>>                 __set_bit(BTN_MIDDLE, dev->keybit);
>>         __set_bit(BTN_RIGHT, dev->keybit);
>>
>> --
>> 2.17.1
>>
>> --
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