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SubjectRe: [PATCH 2/2] HID: multitouch: support Perixx PERIPAD 701
From
Hi Henrik,

On Mon, Jan 16, 2012 at 16:04, Henrik Rydberg <rydberg@euromail.se> wrote:
> Hi Benjamin,
>
>> Perrix Peripad 701 is an hybrid device which presents a touchpad and
>> a keyboard on the same surface. The switch between the two is controlled
>> by a physical switch, and the firmware sends the events on the right
>> interface (mouse, keyboard or multitouch).
>> This patch enables the multitouch interface of this device to work.
>>
>> We need to manually set the device as a trackpad (we cannot infer it
>> from the reports descriptors as the device works under Windows, a system
>> that does not allow multitouch touchpad).
>> We also need to set the hid feature MAX CONTACT NUMBER to 2 or the device
>> stops sending events once it has been pressed by two touches.
>>
>> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
>> ---
>>  drivers/hid/Kconfig          |    1 +
>>  drivers/hid/hid-ids.h        |    1 +
>>  drivers/hid/hid-multitouch.c |   47 ++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 49 insertions(+), 0 deletions(-)
>
> What tree does this patch apply to?

it was Jiri's tree, the branch for-next (just tested it, and the two
patches applied fine)

>
>>
>> diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
>> index a421abd..f7c43b6 100644
>> --- a/drivers/hid/Kconfig
>> +++ b/drivers/hid/Kconfig
>> @@ -355,6 +355,7 @@ config HID_MULTITOUCH
>>         - Lumio CrystalTouch panels
>>         - MosArt dual-touch panels
>>         - PenMount dual touch panels
>> +       - Perixx Peripad 701 touchpad
>>         - PixArt optical touch screen
>>         - Pixcir dual touch panels
>>         - Quanta panels
>> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
>> index b8574cd..662a0b6 100644
>> --- a/drivers/hid/hid-ids.h
>> +++ b/drivers/hid/hid-ids.h
>> @@ -659,6 +659,7 @@
>>
>>  #define USB_VENDOR_ID_TOPSEED2               0x1784
>>  #define USB_DEVICE_ID_TOPSEED2_RF_COMBO      0x0004
>> +#define USB_DEVICE_ID_TOPSEED2_PERIPAD_701   0x0016
>>
>>  #define USB_VENDOR_ID_TOPMAX         0x0663
>>  #define USB_DEVICE_ID_TOPMAX_COBRAPAD        0x0103
>> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
>> index 1ba60d3..a3fa874 100644
>> --- a/drivers/hid/hid-multitouch.c
>> +++ b/drivers/hid/hid-multitouch.c
>> @@ -77,6 +77,8 @@ struct mt_device {
>>       unsigned last_slot_field;       /* the last field of a slot */
>>       int last_mt_collection; /* last known mt-related collection */
>>       __s8 inputmode;         /* InputMode HID feature, -1 if non-existent */
>> +     __s8 maxcontactnumber;          /* Maximum Contact Number HID feature,
>> +                                -1 if non-existent */
>
> How about separating this addition from the device patch?

if you want.

>
>>       __u8 num_received;      /* how many contacts we received */
>>       __u8 num_expected;      /* expected last contact index */
>>       __u8 maxcontacts;
>> @@ -101,6 +103,7 @@ struct mt_device {
>>  #define MT_CLS_CYPRESS                               0x0102
>>  #define MT_CLS_EGALAX                                0x0103
>>  #define MT_CLS_EGALAX_SERIAL                 0x0104
>> +#define MT_CLS_TOPSEED                               0x0105
>>
>>  #define MT_DEFAULT_MAXCONTACT        10
>>
>> @@ -190,6 +193,11 @@ static struct mt_class mt_classes[] = {
>>               .sn_move = 4096,
>>               .sn_pressure = 32,
>>       },
>> +     { .name = MT_CLS_TOPSEED,
>> +             .quirks = MT_QUIRK_ALWAYS_VALID,
>> +             .is_indirect = true,
>> +             .maxcontacts = 2,
>> +     },
>>
>>       { }
>>  };
>> @@ -242,6 +250,7 @@ static void mt_feature_mapping(struct hid_device *hdev,
>>               td->inputmode = field->report->id;
>>               break;
>>       case HID_DG_CONTACTMAX:
>> +             td->maxcontactnumber = field->report->id;
>>               td->maxcontacts = field->value[0];
>>               if (td->mtclass.maxcontacts)
>>                       /* check if the maxcontacts is given by the class */
>
> Contactnumber is a bit unclear, easily mistaken for maxcontacts
> semantic. How about a maxcontact_(id|rid|report_id) instead?

ok for maxcontact_report_id

>
>> @@ -610,6 +619,36 @@ static void mt_set_input_mode(struct hid_device *hdev)
>>       }
>>  }
>>
>> +static void mt_set_maxcontacts(struct hid_device *hdev)
>> +{
>> +     struct mt_device *td = hid_get_drvdata(hdev);
>> +     struct hid_report *r;
>> +     struct hid_report_enum *re;
>> +     int fieldmax, max;
>> +
>> +     if (td->maxcontactnumber < 0)
>> +             return;
>> +
>> +     if (!td->mtclass.maxcontacts)
>> +             return;
>> +
>> +     re = &(hdev->report_enum[HID_FEATURE_REPORT]);
>> +     r = re->report_id_hash[td->maxcontactnumber];
>> +     if (r) {
>> +             max = td->mtclass.maxcontacts;
>> +             fieldmax = r->field[0]->logical_maximum;
>> +             hid_info(hdev, "%s: value = %d / %d / %d\n", __func__,
>> +                     r->field[0]->value[0],
>> +                     td->mtclass.maxcontacts,
>> +                     fieldmax);
>> +             max = fieldmax < max ? fieldmax : max;
>> +             if (r->field[0]->value[0] != max) {
>> +                     r->field[0]->value[0] = max;
>> +                     usbhid_submit_report(hdev, r, USB_DIR_OUT);
>> +             }
>> +     }
>> +}
>> +
>
> This seems to execute for all devices, not only for the present device?

yes and no.

If .maxcontact is not filled, then it won't be executed
(td->mtclass.maxcontacts == 0).

For those having the .maxcontact field, it won't hurt them.
It's even better, as we explicitly ask the device to report the number
of slots we allocate.
If the feature is read-only (or the device crash), then it's a
firmware bug as it's not implementing either the hid protocol, or the
Microsoft kind-of specification.

BTW, thanks for the review, I'll send a v2 soon.

Cheers,
Benjamin

>
>>  static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
>>  {
>>       int ret, i;
>> @@ -635,6 +674,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
>>       }
>>       td->mtclass = *mtclass;
>>       td->inputmode = -1;
>> +     td->maxcontactnumber = -1;
>>       td->last_mt_collection = -1;
>>       hid_set_drvdata(hdev, td);
>>
>> @@ -657,6 +697,7 @@ static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
>>
>>       ret = sysfs_create_group(&hdev->dev.kobj, &mt_attribute_group);
>>
>> +     mt_set_maxcontacts(hdev);
>>       mt_set_input_mode(hdev);
>>
>>       return 0;
>> @@ -669,6 +710,7 @@ fail:
>>  #ifdef CONFIG_PM
>>  static int mt_reset_resume(struct hid_device *hdev)
>>  {
>> +     mt_set_maxcontacts(hdev);
>>       mt_set_input_mode(hdev);
>>       return 0;
>>  }
>> @@ -869,6 +911,11 @@ static const struct hid_device_id mt_devices[] = {
>>               HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_SITRONIX,
>>                       USB_DEVICE_ID_MTP_SITRONIX)},
>>
>> +     /* TopSeed panels */
>> +     { .driver_data = MT_CLS_TOPSEED,
>> +             HID_USB_DEVICE(USB_VENDOR_ID_TOPSEED2,
>> +                     USB_DEVICE_ID_TOPSEED2_PERIPAD_701) },
>> +
>>       /* Touch International panels */
>>       { .driver_data = MT_CLS_DEFAULT,
>>               HID_USB_DEVICE(USB_VENDOR_ID_TOUCH_INTL,
>> --
>> 1.7.4.4
>>
>
> Thanks,
> Henrik
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