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SubjectRe: [PATCH 2/2] HID: multitouch: support Perixx PERIPAD 701
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?

>
> 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?

> __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?
> @@ -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?

> 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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