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SubjectRe: [PATCH 02/25] 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 | 91 ++++++++++++++++++++++++++++++++++++--------
> 2 files changed, 78 insertions(+), 16 deletions(-)

I think it would make more sense to introduce a method where the
driver sees all report values at once. We have had reasonable cause to
add it in the past, but never did.

>
> 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 46d8136..c4acdd0 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -32,6 +32,8 @@
> #include <linux/slab.h>
> #include <linux/usb.h>
> #include <linux/input/mt.h>
> +#include <asm/unaligned.h>
> +#include <asm/byteorder.h>
> #include "usbhid/usbhid.h"
>
>
> @@ -54,6 +56,7 @@ 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 +86,10 @@ struct mt_device {
> struct mt_class mtclass; /* our mt device class */
> struct mt_fields *fields; /* temporary placeholder for storing the
> multitouch fields */
> + struct hid_field *contactcount; /* the hid_field contact count that
> + will be picked in mt_raw_event */
> + __s8 contactcount_index; /* the index of the usage contact count
> + in its hid_field. */
> unsigned last_field_index; /* last field index of the report */
> unsigned last_slot_field; /* the last field of a slot */
> __s8 inputmode; /* InputMode HID feature, -1 if non-existent */
> @@ -111,6 +118,7 @@ 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
> @@ -170,6 +178,9 @@ 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
> @@ -250,6 +261,9 @@ static ssize_t mt_set_quirks(struct device *dev,
>
> td->mtclass.quirks = val;
>
> + if (!td->contactcount)
> + td->mtclass.quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
> +
> return count;
> }
>
> @@ -264,24 +278,26 @@ static struct attribute_group mt_attribute_group = {
> .attrs = sysfs_attrs
> };
>
> +static int mt_find_usage_index(struct hid_field *field, struct hid_usage *usage)
> +{
> + int i;
> + for (i = 0; i < field->maxusage; i++) {
> + if (field->usage[i].hid == usage->hid)
> + return i;
> + }
> + return -1;
> +}
> +
> static void mt_feature_mapping(struct hid_device *hdev,
> struct hid_field *field, struct hid_usage *usage)
> {
> struct mt_device *td = hid_get_drvdata(hdev);
> - int i;
>
> switch (usage->hid) {
> case HID_DG_INPUTMODE:
> td->inputmode = field->report->id;
> - td->inputmode_index = 0; /* has to be updated below */
> -
> - for (i=0; i < field->maxusage; i++) {
> - if (field->usage[i].hid == usage->hid) {
> - td->inputmode_index = i;
> - break;
> - }
> - }
> -
> + td->inputmode_index = mt_find_usage_index(field, usage);
> + /* inputmode_index can't be set at -1 */
> break;
> case HID_DG_CONTACTMAX:
> td->maxcontact_report_id = field->report->id;
> @@ -459,6 +475,10 @@ 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;
> + td->contactcount_index = mt_find_usage_index(field,
> + usage);
> + /* contactcount_index can't be set at -1 */
> td->last_field_index = field->index;
> return 1;
> case HID_DG_CONTACTMAX:
> @@ -523,6 +543,10 @@ 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;
> @@ -623,12 +647,6 @@ static int 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 */
> @@ -658,6 +676,37 @@ static int mt_event(struct hid_device *hid, struct hid_field *field,
> return 1;
> }
>
> +static int mt_raw_event(struct hid_device *hid, struct hid_report *report,
> + u8 *data, int size)
> +{
> + struct mt_device *td = hid_get_drvdata(hid);
> + struct hid_field *field = td->contactcount;
> + s32 *value;
> +
> + if (field && report->id == field->report->id) {
> + /*
> + * Pick in advance the field HID_DG_CONTACTCOUNT as it is
> + * often placed at the end of the report.
> + */
> + if (report->id)
> + data++;
> +
> + value = hid_extract_field(hid, field, data);
> + if (!value)
> + return 0;
> +
> + /*
> + * Includes multi-packet support where subsequent
> + * packets are sent with zero contactcount.
> + */
> + if (value[td->contactcount_index])
> + td->num_expected = value[td->contactcount_index];
> +
> + kfree(value);
> + }
> + return 0;
> +}

This is a lot of cycles for something that is already available in the core.

> +
> static void mt_set_input_mode(struct hid_device *hdev)
> {
> struct mt_device *td = hid_get_drvdata(hdev);
> @@ -719,11 +768,15 @@ 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;
> }
>
> static void mt_input_configured(struct hid_device *hdev, struct hid_input *hi)
> @@ -1056,6 +1109,11 @@ 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,
> @@ -1193,6 +1251,7 @@ static struct hid_driver mt_driver = {
> .feature_mapping = mt_feature_mapping,
> .usage_table = mt_grabbed_usages,
> .event = mt_event,
> + .raw_event = mt_raw_event,

Rather a new and simpler event method here, in other words.

> #ifdef CONFIG_PM
> .reset_resume = mt_reset_resume,
> .resume = mt_resume,
> --
> 1.8.1
>

Thanks,
Henrik


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