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wmt(4): Add support for hardware timestamp reporting

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Hardware timestamp reporting is disabled by default as it produces many
extra events which are not handled by consumers like libinput.
Add hw.usb.wmt.timestamps=1 tunable to loader.conf to enable it.

Obtained from:	sysutils/iichid
This commit is contained in:
Vladimir Kondratyev 2020-12-24 01:18:18 +03:00
parent 8de78df54d
commit 501022d3a0
1 changed files with 42 additions and 3 deletions
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45
sys/dev/usb/input/wmt.c
View file

@ -59,14 +59,16 @@ __FBSDID("$FreeBSD$");
#define USB_DEBUG_VAR wmt_debug
#include <dev/usb/usb_debug.h>
#ifdef USB_DEBUG
static int wmt_debug = 0;
static SYSCTL_NODE(_hw_usb, OID_AUTO, wmt, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"USB MSWindows 7/8/10 compatible Multi-touch Device");
#ifdef USB_DEBUG
static int wmt_debug = 0;
SYSCTL_INT(_hw_usb_wmt, OID_AUTO, debug, CTLFLAG_RWTUN,
&wmt_debug, 1, "Debug level");
#endif
static bool wmt_timestamps = 0;
SYSCTL_BOOL(_hw_usb_wmt, OID_AUTO, timestamps, CTLFLAG_RDTUN,
&wmt_timestamps, 1, "Enable hardware timestamp reporting");
#define WMT_BSIZE 1024 /* bytes, buffer size */
#define WMT_BTN_MAX 8 /* Number of buttons supported */
@ -209,6 +211,12 @@ struct wmt_softc {
struct hid_location cont_count_loc;
struct hid_location btn_loc[WMT_BTN_MAX];
struct hid_location int_btn_loc;
struct hid_location scan_time_loc;
int32_t scan_time_max;
int32_t scan_time;
int32_t timestamp;
bool touch;
bool prev_touch;
struct usb_xfer *xfer[WMT_N_TRANSFER];
struct evdev_dev *evdev;
@ -224,6 +232,7 @@ struct wmt_softc {
uint32_t max_button;
bool has_int_button;
bool is_clickpad;
bool do_timestamps;
struct hid_location cont_max_loc;
uint32_t cont_max_rlen;
@ -382,6 +391,9 @@ wmt_attach(device_t dev)
DPRINTF("Failed to set input mode: %d\n", err);
}
if (/*usb_test_quirk(hw, UQ_MT_TIMESTAMP) ||*/ wmt_timestamps)
sc->do_timestamps = true;
mtx_init(&sc->mtx, "wmt lock", NULL, MTX_DEF);
err = usbd_transfer_setup(uaa->device, &uaa->info.bIfaceIndex,
@ -413,6 +425,10 @@ wmt_attach(device_t dev)
}
evdev_support_event(sc->evdev, EV_SYN);
evdev_support_event(sc->evdev, EV_ABS);
if (sc->do_timestamps) {
evdev_support_event(sc->evdev, EV_MSC);
evdev_support_msc(sc->evdev, MSC_TIMESTAMP);
}
if (sc->max_button != 0 || sc->has_int_button) {
evdev_support_event(sc->evdev, EV_KEY);
if (sc->has_int_button)
@ -478,6 +494,8 @@ wmt_process_report(struct wmt_softc *sc, uint8_t *buf, int len)
uint32_t int_btn = 0;
uint32_t left_btn = 0;
int32_t slot;
uint32_t scan_time;
int32_t delta;
/*
* "In Parallel mode, devices report all contact information in a
@ -553,6 +571,7 @@ wmt_process_report(struct wmt_softc *sc, uint8_t *buf, int len)
!(USAGE_SUPPORTED(sc->caps, WMT_CONFIDENCE) &&
slot_data[WMT_CONFIDENCE] == 0)) {
/* This finger is in proximity of the sensor */
sc->touch = true;
slot_data[WMT_SLOT] = slot;
slot_data[WMT_IN_RANGE] = !slot_data[WMT_IN_RANGE];
/* Divided by two to match visual scale of touch */
@ -574,6 +593,24 @@ wmt_process_report(struct wmt_softc *sc, uint8_t *buf, int len)
}
sc->nconts_todo -= cont_count;
if (sc->do_timestamps && sc->nconts_todo == 0) {
/* HUD_SCAN_TIME is measured in 100us, convert to us. */
scan_time =
hid_get_data_unsigned(buf, len, &sc->scan_time_loc);
if (sc->prev_touch) {
delta = scan_time - sc->scan_time;
if (delta < 0)
delta += sc->scan_time_max;
} else
delta = 0;
sc->scan_time = scan_time;
sc->timestamp += delta * 100;
evdev_push_msc(sc->evdev, MSC_TIMESTAMP, sc->timestamp);
sc->prev_touch = sc->touch;
sc->touch = false;
if (!sc->prev_touch)
sc->timestamp = 0;
}
if (sc->nconts_todo == 0) {
/* Report both the click and external left btns as BTN_LEFT */
if (sc->has_int_button)
@ -869,6 +906,8 @@ wmt_hid_parse(struct wmt_softc *sc, const void *d_ptr, uint16_t d_len)
if (hi.collevel == 1 && hi.usage ==
HID_USAGE2(HUP_DIGITIZERS, HUD_SCAN_TIME)) {
scan_time_found = true;
sc->scan_time_loc = hi.loc;
sc->scan_time_max = hi.logical_maximum;
break;
}