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SubjectRe: [PATCH v2 3/9] HID: multitouch: add support for Nexio 42" panel
Hi Benjamin,

> This device is the worst device I saw. It keeps TipSwitch and InRange
> at 1 for fingers that are not touching the panel.
> The solution is to rely on the field ContactCount, which is accurate
> as the correct information are packed at the begining of the frame.
>
> Unfortunately, CountactCount is most of the time at the end of the report.
> The solution is to pick it when we have the whole report in raw_event.
>
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
> ---
> drivers/hid/hid-ids.h | 3 +++
> drivers/hid/hid-multitouch.c | 36 ++++++++++++++++++++++++++++++------
> 2 files changed, 33 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index dad56aa..0935012 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -597,6 +597,9 @@
> #define USB_VENDOR_ID_NEC 0x073e
> #define USB_DEVICE_ID_NEC_USB_GAME_PAD 0x0301
>
> +#define USB_VENDOR_ID_NEXIO 0x1870
> +#define USB_DEVICE_ID_NEXIO_MULTITOUCH_420 0x010d
> +
> #define USB_VENDOR_ID_NEXTWINDOW 0x1926
> #define USB_DEVICE_ID_NEXTWINDOW_TOUCHSCREEN 0x0003
>
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 092c09b..c9b8fe5 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -54,6 +54,7 @@ MODULE_LICENSE("GPL");
> #define MT_QUIRK_NO_AREA (1 << 9)
> #define MT_QUIRK_IGNORE_DUPLICATES (1 << 10)
> #define MT_QUIRK_HOVERING (1 << 11)
> +#define MT_QUIRK_CONTACT_CNT_ACCURATE (1 << 12)
>
> struct mt_slot {
> __s32 x, y, cx, cy, p, w, h;
> @@ -83,6 +84,7 @@ struct mt_device {
> struct mt_class mtclass; /* our mt device class */
> struct mt_fields *fields; /* temporary placeholder for storing the
> multitouch fields */
> + __s32 *contactcount; /* contact count value in the report */

Why not an index here?

> unsigned last_field_index; /* last field index of the report */
> unsigned last_slot_field; /* the last field of a slot */
> unsigned mt_report_id; /* the report ID of the multitouch device */
> @@ -112,6 +114,7 @@ struct mt_device {
> #define MT_CLS_DUAL_INRANGE_CONTACTNUMBER 0x0007
> #define MT_CLS_DUAL_NSMU_CONTACTID 0x0008
> #define MT_CLS_INRANGE_CONTACTNUMBER 0x0009
> +#define MT_CLS_ALWAYS_TRUE 0x000a
>
> /* vendor specific classes */
> #define MT_CLS_3M 0x0101
> @@ -171,6 +174,9 @@ static struct mt_class mt_classes[] = {
> { .name = MT_CLS_INRANGE_CONTACTNUMBER,
> .quirks = MT_QUIRK_VALID_IS_INRANGE |
> MT_QUIRK_SLOT_IS_CONTACTNUMBER },
> + { .name = MT_CLS_ALWAYS_TRUE,
> + .quirks = MT_QUIRK_ALWAYS_VALID |
> + MT_QUIRK_CONTACT_CNT_ACCURATE },
>
> /*
> * vendor specific classes
> @@ -251,6 +257,9 @@ static ssize_t mt_set_quirks(struct device *dev,
>
> td->mtclass.quirks = val;
>
> + if (!td->contactcount)
> + td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
> +

Why override the overrider here?

> return count;
> }
>
> @@ -461,6 +470,7 @@ static int mt_input_mapping(struct hid_device *hdev, struct hid_input *hi,
> td->last_field_index = field->index;
> return 1;
> case HID_DG_CONTACTCOUNT:
> + td->contactcount = field->value + usage->usage_index;

An index into the the struct actually passed in mt_report() feels safer.

> td->last_field_index = field->index;
> return 1;
> case HID_DG_CONTACTMAX:
> @@ -525,6 +535,10 @@ static int mt_compute_slot(struct mt_device *td, struct input_dev *input)
> */
> static void mt_complete_slot(struct mt_device *td, struct input_dev *input)
> {
> + if ((td->mtclass.quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
> + td->num_received >= td->num_expected)
> + return;
> +
> if (td->curvalid || (td->mtclass.quirks & MT_QUIRK_ALWAYS_VALID)) {
> int slotnum = mt_compute_slot(td, input);
> struct mt_slot *s = &td->curdata;
> @@ -635,12 +649,6 @@ static void mt_process_mt_event(struct hid_device *hid, struct hid_field *field,
> td->curdata.h = value;
> break;
> case HID_DG_CONTACTCOUNT:
> - /*
> - * Includes multi-packet support where subsequent
> - * packets are sent with zero contactcount.
> - */
> - if (value)
> - td->num_expected = value;
> break;
> case HID_DG_TOUCH:
> /* do nothing */
> @@ -676,6 +684,13 @@ static void mt_report(struct hid_device *hid, struct hid_report *report)
> if (!(hid->claimed & HID_CLAIMED_INPUT))
> return;
>
> + /*
> + * Includes multi-packet support where subsequent
> + * packets are sent with zero contactcount.
> + */
> + if (td->contactcount && *td->contactcount)
> + td->num_expected = *td->contactcount;
> +

Here, that is.

> for (r = 0; r < report->maxfield; r++) {
> field = report->field[r];
> count = field->report_count;
> @@ -750,11 +765,15 @@ static void mt_post_parse_default_settings(struct mt_device *td)
> static void mt_post_parse(struct mt_device *td)
> {
> struct mt_fields *f = td->fields;
> + struct mt_class *cls = &td->mtclass;
>
> if (td->touches_by_report > 0) {
> int field_count_per_touch = f->length / td->touches_by_report;
> td->last_slot_field = f->usages[field_count_per_touch - 1];
> }
> +
> + if (!td->contactcount)
> + cls->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;

Since MT_QUIRK_CONTACT_CNT_ACCURATE is a quirk, modifiable by the
user, it should probably not validate num_expected in the code. Better
use the contact count index or something equivalent for that.

> }
>
> static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
> @@ -1087,6 +1106,11 @@ static const struct hid_device_id mt_devices[] = {
> MT_USB_DEVICE(USB_VENDOR_ID_TURBOX,
> USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
>
> + /* Nexio panels */
> + { .driver_data = MT_CLS_ALWAYS_TRUE,
> + MT_USB_DEVICE(USB_VENDOR_ID_NEXIO,
> + USB_DEVICE_ID_NEXIO_MULTITOUCH_420)},
> +
> /* Panasonic panels */
> { .driver_data = MT_CLS_PANASONIC,
> MT_USB_DEVICE(USB_VENDOR_ID_PANASONIC,
> --
> 1.8.1
>

Thanks,
Henrik


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