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SubjectRe: [PATCH 1/1] Input: elantech: Use SMBus based on bus info
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> On Jan 17, 2019, at 10:42 PM, Benjamin Tissoires <benjamin.tissoires@redhat.com> wrote:
>
> Hi Kai-Heng,
>
> On Thu, Jan 17, 2019 at 10:30 AM Kai-Heng Feng
> <kai.heng.feng@canonical.com> wrote:
>>
>> There are some new HP laptops with Elantech touchpad don't support
>> multitouch.
>>
>> Both ETP_BUS_SMB_HST_NTFY_ONLY and ETP_BUS_PS2_SMB_HST_NTFY devices can
>> use SMBus to support 5 fingers touch, so we need to chech them too.
>>
>> So use elantech_use_host_notify() to do a more thouroughly check.
>>
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
>> ---
>> drivers/input/mouse/elantech.c | 58 +++++++++++++++++-----------------
>> 1 file changed, 29 insertions(+), 29 deletions(-)
>>
>> diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
>> index 9fe075c137dc..5bcf1c147eb1 100644
>> --- a/drivers/input/mouse/elantech.c
>> +++ b/drivers/input/mouse/elantech.c
>> @@ -1799,6 +1799,34 @@ static int elantech_create_smbus(struct psmouse *psmouse,
>> leave_breadcrumbs);
>> }
>>
>> +static bool elantech_use_host_notify(struct psmouse *psmouse,
>> + struct elantech_device_info *info)
>> +{
>> + if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version))
>> + return true;
>> +
>> + switch (info->bus) {
>> + case ETP_BUS_PS2_ONLY:
>> + /* expected case */
>> + break;
>> + case ETP_BUS_SMB_ALERT_ONLY:
>> + /* fall-through */
>> + case ETP_BUS_PS2_SMB_ALERT:
>> + psmouse_dbg(psmouse, "Ignoring SMBus provider through alert protocol.\n");
>> + break;
>> + case ETP_BUS_SMB_HST_NTFY_ONLY:
>> + /* fall-through */
>> + case ETP_BUS_PS2_SMB_HST_NTFY:
>> + return true;
>> + default:
>> + psmouse_dbg(psmouse,
>> + "Ignoring SMBus bus provider %d.\n",
>> + info->bus);
>> + }
>> +
>> + return false;
>> +}
>> +
>> /**
>> * elantech_setup_smbus - called once the PS/2 devices are enumerated
>> * and decides to instantiate a SMBus InterTouch device.
>> @@ -1818,7 +1846,7 @@ static int elantech_setup_smbus(struct psmouse *psmouse,
>> * i2c_blacklist_pnp_ids.
>> * Old ICs are up to the user to decide.
>> */
>> - if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) ||
>> + if (!elantech_use_host_notify(psmouse, info) ||
>
> That was my initial approach of the series, but I ended up being more
> conservative as this would flip all of the existing elantech SMBUS
> capable touchpads to use elan_i2c.
> And I didn't want to deal with 4/5 year old laptops that suddenly broke.
>
> So I wonder if you can restrict this default change to the recent
> laptops (let's say 2018+). Maybe by looking at their FW version or
> something else in the DMI?

It was KT who told me that I should use ETP_BUS_PS2_SMB_HST_NTFY.

As for date, KT still knows better than me.

KT,
Can you name a year which is safe enough to enable SMBus?

Kai-Heng

>
> Cheers,
> Benjamin
>
>> psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids))
>> return -ENXIO;
>> }
>> @@ -1838,34 +1866,6 @@ static int elantech_setup_smbus(struct psmouse *psmouse,
>> return 0;
>> }
>>
>> -static bool elantech_use_host_notify(struct psmouse *psmouse,
>> - struct elantech_device_info *info)
>> -{
>> - if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version))
>> - return true;
>> -
>> - switch (info->bus) {
>> - case ETP_BUS_PS2_ONLY:
>> - /* expected case */
>> - break;
>> - case ETP_BUS_SMB_ALERT_ONLY:
>> - /* fall-through */
>> - case ETP_BUS_PS2_SMB_ALERT:
>> - psmouse_dbg(psmouse, "Ignoring SMBus provider through alert protocol.\n");
>> - break;
>> - case ETP_BUS_SMB_HST_NTFY_ONLY:
>> - /* fall-through */
>> - case ETP_BUS_PS2_SMB_HST_NTFY:
>> - return true;
>> - default:
>> - psmouse_dbg(psmouse,
>> - "Ignoring SMBus bus provider %d.\n",
>> - info->bus);
>> - }
>> -
>> - return false;
>> -}
>> -
>> int elantech_init_smbus(struct psmouse *psmouse)
>> {
>> struct elantech_device_info info;
>> --
>> 2.17.1

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