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freebsd-nq/sys/dev/hid/hmt.c
Vladimir Kondratyev 9d04336b61 hmt(4): Add support for touchpads with no "button type" or 
"maximum number of contacts" usages.

Assume touchpad to be a clickpad if it has only internal button.
Set number of contacts to 5 for touchpads and to 10 for touchscreens.
Check for fetched report length to avoid reading of stalled data.
Fixes Dell Precision 7550 laptop.

Tested by:	Shawn Webb <shawn.webb_AT_hardenedbsd_DOT_org>
PR:		257992
MFC after:	2 week
2021-09-02 22:35:27 +03:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2014-2020 Vladimir Kondratyev <wulf@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* MS Windows 7/8/10 compatible HID Multi-touch Device driver.
* https://msdn.microsoft.com/en-us/library/windows/hardware/jj151569(v=vs.85).aspx
* http://download.microsoft.com/download/7/d/d/7dd44bb7-2a7a-4505-ac1c-7227d3d96d5b/hid-over-i2c-protocol-spec-v1-0.docx
* https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.txt
*/
#include "opt_hid.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <dev/evdev/evdev.h>
#include <dev/evdev/input.h>
#define HID_DEBUG_VAR hmt_debug
#include <dev/hid/hid.h>
#include <dev/hid/hidbus.h>
#include <dev/hid/hidquirk.h>
#include <dev/hid/hconf.h>
static SYSCTL_NODE(_hw_hid, OID_AUTO, hmt, CTLFLAG_RW, 0,
"MSWindows 7/8/10 compatible HID Multi-touch Device");
#ifdef HID_DEBUG
static int hmt_debug = 0;
SYSCTL_INT(_hw_hid_hmt, OID_AUTO, debug, CTLFLAG_RWTUN,
&hmt_debug, 1, "Debug level");
#endif
static bool hmt_timestamps = 0;
SYSCTL_BOOL(_hw_hid_hmt, OID_AUTO, timestamps, CTLFLAG_RDTUN,
&hmt_timestamps, 1, "Enable hardware timestamp reporting");
#define HMT_BTN_MAX 8 /* Number of buttons supported */
enum hmt_type {
HMT_TYPE_UNKNOWN = 0, /* HID report descriptor is not probed */
HMT_TYPE_UNSUPPORTED, /* Repdescr does not belong to MT device */
HMT_TYPE_TOUCHPAD,
HMT_TYPE_TOUCHSCREEN,
};
enum {
HMT_TIP_SWITCH = ABS_MT_INDEX(ABS_MT_TOOL_TYPE),
HMT_WIDTH = ABS_MT_INDEX(ABS_MT_TOUCH_MAJOR),
HMT_HEIGHT = ABS_MT_INDEX(ABS_MT_TOUCH_MINOR),
HMT_ORIENTATION = ABS_MT_INDEX(ABS_MT_ORIENTATION),
HMT_X = ABS_MT_INDEX(ABS_MT_POSITION_X),
HMT_Y = ABS_MT_INDEX(ABS_MT_POSITION_Y),
HMT_CONTACTID = ABS_MT_INDEX(ABS_MT_TRACKING_ID),
HMT_PRESSURE = ABS_MT_INDEX(ABS_MT_PRESSURE),
HMT_IN_RANGE = ABS_MT_INDEX(ABS_MT_DISTANCE),
HMT_CONFIDENCE = ABS_MT_INDEX(ABS_MT_BLOB_ID),
HMT_TOOL_X = ABS_MT_INDEX(ABS_MT_TOOL_X),
HMT_TOOL_Y = ABS_MT_INDEX(ABS_MT_TOOL_Y),
};
#define HMT_N_USAGES MT_CNT
#define HMT_NO_USAGE -1
struct hmt_hid_map_item {
char name[5];
int32_t usage; /* HID usage */
bool reported; /* Item value is passed to evdev */
bool required; /* Required for MT Digitizers */
};
static const struct hmt_hid_map_item hmt_hid_map[HMT_N_USAGES] = {
[HMT_TIP_SWITCH] = {
.name = "TIP",
.usage = HID_USAGE2(HUP_DIGITIZERS, HUD_TIP_SWITCH),
.reported = false,
.required = true,
},
[HMT_WIDTH] = {
.name = "WDTH",
.usage = HID_USAGE2(HUP_DIGITIZERS, HUD_WIDTH),
.reported = true,
.required = false,
},
[HMT_HEIGHT] = {
.name = "HGHT",
.usage = HID_USAGE2(HUP_DIGITIZERS, HUD_HEIGHT),
.reported = true,
.required = false,
},
[HMT_ORIENTATION] = {
.name = "ORIE",
.usage = HMT_NO_USAGE,
.reported = true,
.required = false,
},
[HMT_X] = {
.name = "X",
.usage = HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_X),
.reported = true,
.required = true,
},
[HMT_Y] = {
.name = "Y",
.usage = HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_Y),
.reported = true,
.required = true,
},
[HMT_CONTACTID] = {
.name = "C_ID",
.usage = HID_USAGE2(HUP_DIGITIZERS, HUD_CONTACTID),
.reported = true,
.required = true,
},
[HMT_PRESSURE] = {
.name = "PRES",
.usage = HID_USAGE2(HUP_DIGITIZERS, HUD_TIP_PRESSURE),
.reported = true,
.required = false,
},
[HMT_IN_RANGE] = {
.name = "RANG",
.usage = HID_USAGE2(HUP_DIGITIZERS, HUD_IN_RANGE),
.reported = true,
.required = false,
},
[HMT_CONFIDENCE] = {
.name = "CONF",
.usage = HID_USAGE2(HUP_DIGITIZERS, HUD_CONFIDENCE),
.reported = false,
.required = false,
},
[HMT_TOOL_X] = { /* Shares HID usage with POS_X */
.name = "TL_X",
.usage = HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_X),
.reported = true,
.required = false,
},
[HMT_TOOL_Y] = { /* Shares HID usage with POS_Y */
.name = "TL_Y",
.usage = HID_USAGE2(HUP_GENERIC_DESKTOP, HUG_Y),
.reported = true,
.required = false,
},
};
struct hmt_softc {
device_t dev;
enum hmt_type type;
int32_t cont_count_max;
struct hid_absinfo ai[HMT_N_USAGES];
struct hid_location locs[MAX_MT_SLOTS][HMT_N_USAGES];
struct hid_location cont_count_loc;
struct hid_location btn_loc[HMT_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 evdev_dev *evdev;
union evdev_mt_slot slot_data;
uint8_t caps[howmany(HMT_N_USAGES, 8)];
uint8_t buttons[howmany(HMT_BTN_MAX, 8)];
uint32_t nconts_per_report;
uint32_t nconts_todo;
uint8_t report_id;
uint32_t max_button;
bool has_int_button;
bool has_cont_count;
bool has_scan_time;
bool is_clickpad;
bool do_timestamps;
#ifdef IICHID_SAMPLING
bool iichid_sampling;
#endif
struct hid_location cont_max_loc;
uint32_t cont_max_rlen;
uint8_t cont_max_rid;
struct hid_location btn_type_loc;
uint32_t btn_type_rlen;
uint8_t btn_type_rid;
uint32_t thqa_cert_rlen;
uint8_t thqa_cert_rid;
};
#define HMT_FOREACH_USAGE(caps, usage) \
for ((usage) = 0; (usage) < HMT_N_USAGES; ++(usage)) \
if (isset((caps), (usage)))
static enum hmt_type hmt_hid_parse(struct hmt_softc *, const void *,
hid_size_t, uint32_t, uint8_t);
static int hmt_set_input_mode(struct hmt_softc *, enum hconf_input_mode);
static hid_intr_t hmt_intr;
static device_probe_t hmt_probe;
static device_attach_t hmt_attach;
static device_detach_t hmt_detach;
static evdev_open_t hmt_ev_open;
static evdev_close_t hmt_ev_close;
static const struct evdev_methods hmt_evdev_methods = {
.ev_open = &hmt_ev_open,
.ev_close = &hmt_ev_close,
};
static const struct hid_device_id hmt_devs[] = {
{ HID_TLC(HUP_DIGITIZERS, HUD_TOUCHSCREEN) },
{ HID_TLC(HUP_DIGITIZERS, HUD_TOUCHPAD) },
};
static int
hmt_ev_close(struct evdev_dev *evdev)
{
return (hidbus_intr_stop(evdev_get_softc(evdev)));
}
static int
hmt_ev_open(struct evdev_dev *evdev)
{
return (hidbus_intr_start(evdev_get_softc(evdev)));
}
static int
hmt_probe(device_t dev)
{
struct hmt_softc *sc = device_get_softc(dev);
void *d_ptr;
hid_size_t d_len;
int err;
err = HIDBUS_LOOKUP_DRIVER_INFO(dev, hmt_devs);
if (err != 0)
return (err);
err = hid_get_report_descr(dev, &d_ptr, &d_len);
if (err != 0) {
device_printf(dev, "could not retrieve report descriptor from "
"device: %d\n", err);
return (ENXIO);
}
/* Check if report descriptor belongs to a HID multitouch device */
if (sc->type == HMT_TYPE_UNKNOWN)
sc->type = hmt_hid_parse(sc, d_ptr, d_len,
hidbus_get_usage(dev), hidbus_get_index(dev));
if (sc->type == HMT_TYPE_UNSUPPORTED)
return (ENXIO);
hidbus_set_desc(dev,
sc->type == HMT_TYPE_TOUCHPAD ? "TouchPad" : "TouchScreen");
return (BUS_PROBE_DEFAULT);
}
static int
hmt_attach(device_t dev)
{
struct hmt_softc *sc = device_get_softc(dev);
const struct hid_device_info *hw = hid_get_device_info(dev);
void *d_ptr;
uint8_t *fbuf = NULL;
hid_size_t d_len, fsize, rsize;
uint32_t cont_count_max;
int nbuttons, btn;
size_t i;
int err;
err = hid_get_report_descr(dev, &d_ptr, &d_len);
if (err != 0) {
device_printf(dev, "could not retrieve report descriptor from "
"device: %d\n", err);
return (ENXIO);
}
sc->dev = dev;
fsize = hid_report_size_max(d_ptr, d_len, hid_feature, NULL);
if (fsize != 0)
fbuf = malloc(fsize, M_TEMP, M_WAITOK | M_ZERO);
/* Fetch and parse "Contact count maximum" feature report */
if (sc->cont_max_rlen > 1) {
err = hid_get_report(dev, fbuf, sc->cont_max_rlen, &rsize,
HID_FEATURE_REPORT, sc->cont_max_rid);
if (err == 0 && (rsize - 1) * 8 >=
sc->cont_max_loc.pos + sc->cont_max_loc.size) {
cont_count_max = hid_get_udata(fbuf + 1,
sc->cont_max_rlen - 1, &sc->cont_max_loc);
/*
* Feature report is a primary source of
* 'Contact Count Maximum'
*/
if (cont_count_max > 0)
sc->cont_count_max = cont_count_max;
} else
DPRINTF("hid_get_report error=%d\n", err);
}
if (sc->cont_count_max == 0)
sc->cont_count_max = sc->type == HMT_TYPE_TOUCHSCREEN ? 10 : 5;
/* Fetch and parse "Button type" feature report */
if (sc->btn_type_rlen > 1 && sc->btn_type_rid != sc->cont_max_rid) {
bzero(fbuf, fsize);
err = hid_get_report(dev, fbuf, sc->btn_type_rlen, &rsize,
HID_FEATURE_REPORT, sc->btn_type_rid);
if (err != 0)
DPRINTF("hid_get_report error=%d\n", err);
}
if (sc->btn_type_rlen > 1 && err == 0 && (rsize - 1) * 8 >=
sc->btn_type_loc.pos + sc->btn_type_loc.size)
sc->is_clickpad = hid_get_udata(fbuf + 1, sc->btn_type_rlen - 1,
&sc->btn_type_loc) == 0;
else
sc->is_clickpad = sc->max_button == 0 && sc->has_int_button;
/* Fetch THQA certificate to enable some devices like WaveShare */
if (sc->thqa_cert_rlen > 1 && sc->thqa_cert_rid != sc->cont_max_rid)
(void)hid_get_report(dev, fbuf, sc->thqa_cert_rlen, NULL,
HID_FEATURE_REPORT, sc->thqa_cert_rid);
free(fbuf, M_TEMP);
/* Switch touchpad in to absolute multitouch mode */
if (sc->type == HMT_TYPE_TOUCHPAD) {
err = hmt_set_input_mode(sc, HCONF_INPUT_MODE_MT_TOUCHPAD);
if (err != 0)
DPRINTF("Failed to set input mode: %d\n", err);
}
/* Cap contact count maximum to MAX_MT_SLOTS */
if (sc->cont_count_max > MAX_MT_SLOTS) {
DPRINTF("Hardware reported %d contacts while only %d is "
"supported\n", sc->cont_count_max, MAX_MT_SLOTS);
sc->cont_count_max = MAX_MT_SLOTS;
}
if (sc->has_scan_time &&
(hid_test_quirk(hw, HQ_MT_TIMESTAMP) || hmt_timestamps))
sc->do_timestamps = true;
#ifdef IICHID_SAMPLING
if (hid_test_quirk(hw, HQ_IICHID_SAMPLING))
sc->iichid_sampling = true;
#endif
hidbus_set_intr(dev, hmt_intr, sc);
sc->evdev = evdev_alloc();
evdev_set_name(sc->evdev, device_get_desc(dev));
evdev_set_phys(sc->evdev, device_get_nameunit(dev));
evdev_set_id(sc->evdev, hw->idBus, hw->idVendor, hw->idProduct,
hw->idVersion);
evdev_set_serial(sc->evdev, hw->serial);
evdev_set_methods(sc->evdev, dev, &hmt_evdev_methods);
evdev_set_flag(sc->evdev, EVDEV_FLAG_MT_STCOMPAT);
evdev_set_flag(sc->evdev, EVDEV_FLAG_EXT_EPOCH); /* hidbus child */
switch (sc->type) {
case HMT_TYPE_TOUCHSCREEN:
evdev_support_prop(sc->evdev, INPUT_PROP_DIRECT);
break;
case HMT_TYPE_TOUCHPAD:
evdev_support_prop(sc->evdev, INPUT_PROP_POINTER);
if (sc->is_clickpad)
evdev_support_prop(sc->evdev, INPUT_PROP_BUTTONPAD);
break;
default:
KASSERT(0, ("hmt_attach: unsupported touch device type"));
}
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);
}
#ifdef IICHID_SAMPLING
if (sc->iichid_sampling)
evdev_set_flag(sc->evdev, EVDEV_FLAG_MT_AUTOREL);
#endif
nbuttons = 0;
if (sc->max_button != 0 || sc->has_int_button) {
evdev_support_event(sc->evdev, EV_KEY);
if (sc->has_int_button)
evdev_support_key(sc->evdev, BTN_LEFT);
for (btn = 0; btn < sc->max_button; ++btn) {
if (isset(sc->buttons, btn)) {
evdev_support_key(sc->evdev, BTN_MOUSE + btn);
nbuttons++;
}
}
}
evdev_support_abs(sc->evdev,
ABS_MT_SLOT, 0, sc->cont_count_max - 1, 0, 0, 0);
HMT_FOREACH_USAGE(sc->caps, i) {
if (hmt_hid_map[i].reported)
evdev_support_abs(sc->evdev, ABS_MT_FIRST + i,
sc->ai[i].min, sc->ai[i].max, 0, 0, sc->ai[i].res);
}
err = evdev_register(sc->evdev);
if (err) {
hmt_detach(dev);
return (ENXIO);
}
/* Announce information about the touch device */
device_printf(sc->dev, "%s %s with %d external button%s%s\n",
sc->cont_count_max > 1 ? "Multitouch" : "Singletouch",
sc->type == HMT_TYPE_TOUCHSCREEN ? "touchscreen" : "touchpad",
nbuttons, nbuttons != 1 ? "s" : "",
sc->is_clickpad ? ", click-pad" : "");
device_printf(sc->dev,
"%d contact%s with [%s%s%s%s%s] properties. Report range [%d:%d] - [%d:%d]\n",
(int)sc->cont_count_max, sc->cont_count_max != 1 ? "s" : "",
isset(sc->caps, HMT_IN_RANGE) ? "R" : "",
isset(sc->caps, HMT_CONFIDENCE) ? "C" : "",
isset(sc->caps, HMT_WIDTH) ? "W" : "",
isset(sc->caps, HMT_HEIGHT) ? "H" : "",
isset(sc->caps, HMT_PRESSURE) ? "P" : "",
(int)sc->ai[HMT_X].min, (int)sc->ai[HMT_Y].min,
(int)sc->ai[HMT_X].max, (int)sc->ai[HMT_Y].max);
return (0);
}
static int
hmt_detach(device_t dev)
{
struct hmt_softc *sc = device_get_softc(dev);
evdev_free(sc->evdev);
return (0);
}
static void
hmt_intr(void *context, void *buf, hid_size_t len)
{
struct hmt_softc *sc = context;
size_t usage;
union evdev_mt_slot *slot_data;
uint32_t cont, btn;
uint32_t cont_count;
uint32_t width;
uint32_t height;
uint32_t int_btn = 0;
uint32_t left_btn = 0;
int slot;
uint32_t scan_time;
int32_t delta;
uint8_t id;
#ifdef IICHID_SAMPLING
/*
* Special packet of zero length is generated by iichid driver running
* in polling mode at the start of inactivity period to workaround
* "stuck touch" problem caused by miss of finger release events.
* This snippet is to be removed after GPIO interrupt support is added.
*/
if (sc->iichid_sampling && len == 0) {
sc->prev_touch = false;
sc->timestamp = 0;
/* EVDEV_FLAG_MT_AUTOREL releases all touches for us */
evdev_sync(sc->evdev);
return;
}
#endif
/* Ignore irrelevant reports */
id = sc->report_id != 0 ? *(uint8_t *)buf : 0;
if (sc->report_id != id) {
DPRINTF("Skip report with unexpected ID: %hhu\n", id);
return;
}
/* Strip leading "report ID" byte */
if (sc->report_id != 0) {
len--;
buf = (uint8_t *)buf + 1;
}
/*
* "In Serial mode, each packet contains information that describes a
* single physical contact point. Multiple contacts are streamed
* serially. In this mode, devices report all contact information in a
* series of packets. The device sends a separate packet for each
* concurrent contact."
*
* "In Parallel mode, devices report all contact information in a
* single packet. Each physical contact is represented by a logical
* collection that is embedded in the top-level collection."
*
* Since additional contacts that were not present will still be in the
* report with contactid=0 but contactids are zero-based, find
* contactcount first.
*/
if (sc->has_cont_count)
cont_count = hid_get_udata(buf, len, &sc->cont_count_loc);
else
cont_count = 1;
/*
* "In Hybrid mode, the number of contacts that can be reported in one
* report is less than the maximum number of contacts that the device
* supports. For example, a device that supports a maximum of
* 4 concurrent physical contacts, can set up its top-level collection
* to deliver a maximum of two contacts in one report. If four contact
* points are present, the device can break these up into two serial
* reports that deliver two contacts each.
*
* "When a device delivers data in this manner, the Contact Count usage
* value in the first report should reflect the total number of
* contacts that are being delivered in the hybrid reports. The other
* serial reports should have a contact count of zero (0)."
*/
if (cont_count != 0)
sc->nconts_todo = cont_count;
#ifdef HID_DEBUG
DPRINTFN(6, "cont_count:%2u", (unsigned)cont_count);
if (hmt_debug >= 6) {
HMT_FOREACH_USAGE(sc->caps, usage) {
if (hmt_hid_map[usage].usage != HMT_NO_USAGE)
printf(" %-4s", hmt_hid_map[usage].name);
}
printf("\n");
}
#endif
/* Find the number of contacts reported in current report */
cont_count = MIN(sc->nconts_todo, sc->nconts_per_report);
/* Use protocol Type B for reporting events */
for (cont = 0; cont < cont_count; cont++) {
slot_data = &sc->slot_data;
bzero(slot_data, sizeof(sc->slot_data));
HMT_FOREACH_USAGE(sc->caps, usage) {
if (sc->locs[cont][usage].size > 0)
slot_data->val[usage] = hid_get_udata(
buf, len, &sc->locs[cont][usage]);
}
slot = evdev_mt_id_to_slot(sc->evdev, slot_data->id);
#ifdef HID_DEBUG
DPRINTFN(6, "cont%01x: data = ", cont);
if (hmt_debug >= 6) {
HMT_FOREACH_USAGE(sc->caps, usage) {
if (hmt_hid_map[usage].usage != HMT_NO_USAGE)
printf("%04x ", slot_data->val[usage]);
}
printf("slot = %d\n", slot);
}
#endif
if (slot == -1) {
DPRINTF("Slot overflow for contact_id %u\n",
(unsigned)slot_data->id);
continue;
}
if (slot_data->val[HMT_TIP_SWITCH] != 0 &&
!(isset(sc->caps, HMT_CONFIDENCE) &&
slot_data->val[HMT_CONFIDENCE] == 0)) {
/* This finger is in proximity of the sensor */
sc->touch = true;
slot_data->dist = !slot_data->val[HMT_IN_RANGE];
/* Divided by two to match visual scale of touch */
width = slot_data->val[HMT_WIDTH] >> 1;
height = slot_data->val[HMT_HEIGHT] >> 1;
slot_data->ori = width > height;
slot_data->maj = MAX(width, height);
slot_data->min = MIN(width, height);
} else
slot_data = NULL;
evdev_mt_push_slot(sc->evdev, slot, slot_data);
}
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_udata(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)
int_btn = hid_get_data(buf, len, &sc->int_btn_loc);
if (isset(sc->buttons, 0))
left_btn = hid_get_data(buf, len, &sc->btn_loc[0]);
if (sc->has_int_button || isset(sc->buttons, 0))
evdev_push_key(sc->evdev, BTN_LEFT,
(int_btn != 0) | (left_btn != 0));
for (btn = 1; btn < sc->max_button; ++btn) {
if (isset(sc->buttons, btn))
evdev_push_key(sc->evdev, BTN_MOUSE + btn,
hid_get_data(buf,
len,
&sc->btn_loc[btn]) != 0);
}
evdev_sync(sc->evdev);
}
}
static enum hmt_type
hmt_hid_parse(struct hmt_softc *sc, const void *d_ptr, hid_size_t d_len,
uint32_t tlc_usage, uint8_t tlc_index)
{
struct hid_absinfo ai;
struct hid_item hi;
struct hid_data *hd;
uint32_t flags;
size_t i;
size_t cont = 0;
enum hmt_type type;
uint32_t left_btn, btn;
int32_t cont_count_max = 0;
uint8_t report_id = 0;
bool finger_coll = false;
bool cont_count_found = false;
bool scan_time_found = false;
bool has_int_button = false;
#define HMT_HI_ABSOLUTE(hi) ((hi).nusages != 0 && \
((hi).flags & (HIO_VARIABLE | HIO_RELATIVE)) == HIO_VARIABLE)
#define HUMS_THQA_CERT 0xC5
/*
* Get left button usage taking in account MS Precision Touchpad specs.
* For Windows PTP report descriptor assigns buttons in following way:
* Button 1 - Indicates Button State for touchpad button integrated
* with digitizer.
* Button 2 - Indicates Button State for external button for primary
* (default left) clicking.
* Button 3 - Indicates Button State for external button for secondary
* (default right) clicking.
* If a device only supports external buttons, it must still use
* Button 2 and Button 3 to reference the external buttons.
*/
switch (tlc_usage) {
case HID_USAGE2(HUP_DIGITIZERS, HUD_TOUCHSCREEN):
type = HMT_TYPE_TOUCHSCREEN;
left_btn = 1;
break;
case HID_USAGE2(HUP_DIGITIZERS, HUD_TOUCHPAD):
type = HMT_TYPE_TOUCHPAD;
left_btn = 2;
break;
default:
return (HMT_TYPE_UNSUPPORTED);
}
/* Parse features for mandatory maximum contact count usage */
if (!hidbus_locate(d_ptr, d_len,
HID_USAGE2(HUP_DIGITIZERS, HUD_CONTACT_MAX), hid_feature,
tlc_index, 0, &sc->cont_max_loc, &flags, &sc->cont_max_rid, &ai) ||
(flags & (HIO_VARIABLE | HIO_RELATIVE)) != HIO_VARIABLE)
return (HMT_TYPE_UNSUPPORTED);
cont_count_max = ai.max;
/* Parse features for button type usage */
if (hidbus_locate(d_ptr, d_len,
HID_USAGE2(HUP_DIGITIZERS, HUD_BUTTON_TYPE), hid_feature,
tlc_index, 0, &sc->btn_type_loc, &flags, &sc->btn_type_rid, NULL)
&& (flags & (HIO_VARIABLE | HIO_RELATIVE)) != HIO_VARIABLE)
sc->btn_type_rid = 0;
/* Parse features for THQA certificate report ID */
hidbus_locate(d_ptr, d_len, HID_USAGE2(HUP_MICROSOFT, HUMS_THQA_CERT),
hid_feature, tlc_index, 0, NULL, NULL, &sc->thqa_cert_rid, NULL);
/* Parse input for other parameters */
hd = hid_start_parse(d_ptr, d_len, 1 << hid_input);
HIDBUS_FOREACH_ITEM(hd, &hi, tlc_index) {
switch (hi.kind) {
case hid_collection:
if (hi.collevel == 2 &&
hi.usage == HID_USAGE2(HUP_DIGITIZERS, HUD_FINGER))
finger_coll = true;
break;
case hid_endcollection:
if (hi.collevel == 1 && finger_coll) {
finger_coll = false;
cont++;
}
break;
case hid_input:
/*
* Ensure that all usages belong to the same report
*/
if (HMT_HI_ABSOLUTE(hi) &&
(report_id == 0 || report_id == hi.report_ID))
report_id = hi.report_ID;
else
break;
if (hi.collevel == 1 && left_btn == 2 &&
hi.usage == HID_USAGE2(HUP_BUTTON, 1)) {
has_int_button = true;
sc->int_btn_loc = hi.loc;
break;
}
if (hi.collevel == 1 &&
hi.usage >= HID_USAGE2(HUP_BUTTON, left_btn) &&
hi.usage <= HID_USAGE2(HUP_BUTTON, HMT_BTN_MAX)) {
btn = (hi.usage & 0xFFFF) - left_btn;
setbit(sc->buttons, btn);
sc->btn_loc[btn] = hi.loc;
if (btn >= sc->max_button)
sc->max_button = btn + 1;
break;
}
if (hi.collevel == 1 && hi.usage ==
HID_USAGE2(HUP_DIGITIZERS, HUD_CONTACTCOUNT)) {
cont_count_found = true;
sc->cont_count_loc = hi.loc;
break;
}
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;
}
if (!finger_coll || hi.collevel != 2)
break;
if (cont >= MAX_MT_SLOTS) {
DPRINTF("Finger %zu ignored\n", cont);
break;
}
for (i = 0; i < HMT_N_USAGES; i++) {
if (hi.usage == hmt_hid_map[i].usage) {
/*
* HUG_X usage is an array mapped to
* both ABS_MT_POSITION and ABS_MT_TOOL
* events. So don`t stop search if we
* already have HUG_X mapping done.
*/
if (sc->locs[cont][i].size)
continue;
sc->locs[cont][i] = hi.loc;
/*
* Hid parser returns valid logical and
* physical sizes for first finger only
* at least on ElanTS 0x04f3:0x0012.
*/
if (cont > 0)
break;
setbit(sc->caps, i);
sc->ai[i] = (struct hid_absinfo) {
.max = hi.logical_maximum,
.min = hi.logical_minimum,
.res = hid_item_resolution(&hi),
};
break;
}
}
break;
default:
break;
}
}
hid_end_parse(hd);
/* Check for required HID Usages */
if ((!cont_count_found && cont != 1) || cont == 0)
return (HMT_TYPE_UNSUPPORTED);
for (i = 0; i < HMT_N_USAGES; i++) {
if (hmt_hid_map[i].required && isclr(sc->caps, i))
return (HMT_TYPE_UNSUPPORTED);
}
/* Touchpads must have at least one button */
if (type == HMT_TYPE_TOUCHPAD && !sc->max_button && !has_int_button)
return (HMT_TYPE_UNSUPPORTED);
/*
* According to specifications 'Contact Count Maximum' should be read
* from Feature Report rather than from HID descriptor. Set sane
* default value now to handle the case of 'Get Report' request failure
*/
if (cont_count_max < 1)
cont_count_max = cont;
/* Report touch orientation if both width and height are supported */
if (isset(sc->caps, HMT_WIDTH) && isset(sc->caps, HMT_HEIGHT)) {
setbit(sc->caps, HMT_ORIENTATION);
sc->ai[HMT_ORIENTATION].max = 1;
}
sc->cont_max_rlen = hid_report_size(d_ptr, d_len, hid_feature,
sc->cont_max_rid);
if (sc->btn_type_rid > 0)
sc->btn_type_rlen = hid_report_size(d_ptr, d_len,
hid_feature, sc->btn_type_rid);
if (sc->thqa_cert_rid > 0)
sc->thqa_cert_rlen = hid_report_size(d_ptr, d_len,
hid_feature, sc->thqa_cert_rid);
sc->report_id = report_id;
sc->cont_count_max = cont_count_max;
sc->nconts_per_report = cont;
sc->has_int_button = has_int_button;
sc->has_cont_count = cont_count_found;
sc->has_scan_time = scan_time_found;
return (type);
}
static int
hmt_set_input_mode(struct hmt_softc *sc, enum hconf_input_mode mode)
{
devclass_t hconf_devclass;
device_t hconf;
int err;
GIANT_REQUIRED;
/* Find touchpad's configuration TLC */
hconf = hidbus_find_child(device_get_parent(sc->dev),
HID_USAGE2(HUP_DIGITIZERS, HUD_CONFIG));
if (hconf == NULL)
return (ENXIO);
/* Ensure that hconf driver is attached to configuration TLC */
if (device_is_alive(hconf) == 0)
device_probe_and_attach(hconf);
if (device_is_attached(hconf) == 0)
return (ENXIO);
hconf_devclass = devclass_find("hconf");
if (device_get_devclass(hconf) != hconf_devclass)
return (ENXIO);
/* hconf_set_input_mode can drop the Giant while sleeping */
device_busy(hconf);
err = hconf_set_input_mode(hconf, mode);
device_unbusy(hconf);
return (err);
}
static devclass_t hmt_devclass;
static device_method_t hmt_methods[] = {
DEVMETHOD(device_probe, hmt_probe),
DEVMETHOD(device_attach, hmt_attach),
DEVMETHOD(device_detach, hmt_detach),
DEVMETHOD_END
};
static driver_t hmt_driver = {
.name = "hmt",
.methods = hmt_methods,
.size = sizeof(struct hmt_softc),
};
DRIVER_MODULE(hmt, hidbus, hmt_driver, hmt_devclass, NULL, 0);
MODULE_DEPEND(hmt, hidbus, 1, 1, 1);
MODULE_DEPEND(hmt, hid, 1, 1, 1);
MODULE_DEPEND(hmt, hconf, 1, 1, 1);
MODULE_DEPEND(hmt, evdev, 1, 1, 1);
MODULE_VERSION(hmt, 1);
HID_PNP_INFO(hmt_devs);
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