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hid-multitouch.c
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hid-multitouch.c
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/*
* HID driver for multitouch panels
*
* Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
* Copyright (c) 2010-2013 Benjamin Tissoires <benjamin.tissoires@gmail.com>
* Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
* Copyright (c) 2012-2013 Red Hat, Inc
*
* This code is partly based on hid-egalax.c:
*
* Copyright (c) 2010 Stephane Chatty <chatty@enac.fr>
* Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
* Copyright (c) 2010 Canonical, Ltd.
*
* This code is partly based on hid-3m-pct.c:
*
* Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
* Copyright (c) 2010 Henrik Rydberg <rydberg@euromail.se>
* Copyright (c) 2010 Canonical, Ltd.
*
*/
/*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
/*
* This driver is regularly tested thanks to the test suite in hid-tools[1].
* Please run these regression tests before patching this module so that
* your patch won't break existing known devices.
*
* [1] https://gitlab.freedesktop.org/libevdev/hid-tools
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input/mt.h>
#include <linux/jiffies.h>
#include <linux/string.h>
#include <linux/timer.h>
MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
MODULE_DESCRIPTION("HID multitouch panels");
MODULE_LICENSE("GPL");
#include "hid-ids.h"
/* quirks to control the device */
#define MT_QUIRK_NOT_SEEN_MEANS_UP BIT(0)
#define MT_QUIRK_SLOT_IS_CONTACTID BIT(1)
#define MT_QUIRK_CYPRESS BIT(2)
#define MT_QUIRK_SLOT_IS_CONTACTNUMBER BIT(3)
#define MT_QUIRK_ALWAYS_VALID BIT(4)
#define MT_QUIRK_VALID_IS_INRANGE BIT(5)
#define MT_QUIRK_VALID_IS_CONFIDENCE BIT(6)
#define MT_QUIRK_CONFIDENCE BIT(7)
#define MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE BIT(8)
#define MT_QUIRK_NO_AREA BIT(9)
#define MT_QUIRK_IGNORE_DUPLICATES BIT(10)
#define MT_QUIRK_HOVERING BIT(11)
#define MT_QUIRK_CONTACT_CNT_ACCURATE BIT(12)
#define MT_QUIRK_FORCE_GET_FEATURE BIT(13)
#define MT_QUIRK_FIX_CONST_CONTACT_ID BIT(14)
#define MT_QUIRK_TOUCH_SIZE_SCALING BIT(15)
#define MT_QUIRK_STICKY_FINGERS BIT(16)
#define MT_QUIRK_ASUS_CUSTOM_UP BIT(17)
#define MT_QUIRK_WIN8_PTP_BUTTONS BIT(18)
#define MT_QUIRK_SEPARATE_APP_REPORT BIT(19)
#define MT_INPUTMODE_TOUCHSCREEN 0x02
#define MT_INPUTMODE_TOUCHPAD 0x03
#define MT_BUTTONTYPE_CLICKPAD 0
enum latency_mode {
HID_LATENCY_NORMAL = 0,
HID_LATENCY_HIGH = 1,
};
#define MT_IO_FLAGS_RUNNING 0
#define MT_IO_FLAGS_ACTIVE_SLOTS 1
#define MT_IO_FLAGS_PENDING_SLOTS 2
static const bool mtrue = true; /* default for true */
static const bool mfalse; /* default for false */
static const __s32 mzero; /* default for 0 */
#define DEFAULT_TRUE ((void *)&mtrue)
#define DEFAULT_FALSE ((void *)&mfalse)
#define DEFAULT_ZERO ((void *)&mzero)
struct mt_usages {
struct list_head list;
__s32 *x, *y, *cx, *cy, *p, *w, *h, *a;
__s32 *contactid; /* the device ContactID assigned to this slot */
bool *tip_state; /* is the touch valid? */
bool *inrange_state; /* is the finger in proximity of the sensor? */
bool *confidence_state; /* is the touch made by a finger? */
};
struct mt_application {
struct list_head list;
unsigned int application;
unsigned int report_id;
struct list_head mt_usages; /* mt usages list */
__s32 quirks;
__s32 *scantime; /* scantime reported */
__s32 scantime_logical_max; /* max value for raw scantime */
__s32 *raw_cc; /* contact count in the report */
int left_button_state; /* left button state */
unsigned int mt_flags; /* flags to pass to input-mt */
unsigned long *pending_palm_slots; /* slots where we reported palm
* and need to release */
__u8 num_received; /* how many contacts we received */
__u8 num_expected; /* expected last contact index */
__u8 buttons_count; /* number of physical buttons per touchpad */
__u8 touches_by_report; /* how many touches are present in one report:
* 1 means we should use a serial protocol
* > 1 means hybrid (multitouch) protocol
*/
__s32 dev_time; /* the scan time provided by the device */
unsigned long jiffies; /* the frame's jiffies */
int timestamp; /* the timestamp to be sent */
int prev_scantime; /* scantime reported previously */
bool have_contact_count;
};
struct mt_class {
__s32 name; /* MT_CLS */
__s32 quirks;
__s32 sn_move; /* Signal/noise ratio for move events */
__s32 sn_width; /* Signal/noise ratio for width events */
__s32 sn_height; /* Signal/noise ratio for height events */
__s32 sn_pressure; /* Signal/noise ratio for pressure events */
__u8 maxcontacts;
bool is_indirect; /* true for touchpads */
bool export_all_inputs; /* do not ignore mouse, keyboards, etc... */
};
struct mt_report_data {
struct list_head list;
struct hid_report *report;
struct mt_application *application;
bool is_mt_collection;
};
struct mt_device {
struct mt_class mtclass; /* our mt device class */
struct timer_list release_timer; /* to release sticky fingers */
struct hid_device *hdev; /* hid_device we're attached to */
unsigned long mt_io_flags; /* mt flags (MT_IO_FLAGS_*) */
__u8 inputmode_value; /* InputMode HID feature value */
__u8 maxcontacts;
bool is_buttonpad; /* is this device a button pad? */
bool serial_maybe; /* need to check for serial protocol */
struct list_head applications;
struct list_head reports;
};
static void mt_post_parse_default_settings(struct mt_device *td,
struct mt_application *app);
static void mt_post_parse(struct mt_device *td, struct mt_application *app);
/* classes of device behavior */
#define MT_CLS_DEFAULT 0x0001
#define MT_CLS_SERIAL 0x0002
#define MT_CLS_CONFIDENCE 0x0003
#define MT_CLS_CONFIDENCE_CONTACT_ID 0x0004
#define MT_CLS_CONFIDENCE_MINUS_ONE 0x0005
#define MT_CLS_DUAL_INRANGE_CONTACTID 0x0006
#define MT_CLS_DUAL_INRANGE_CONTACTNUMBER 0x0007
/* reserved 0x0008 */
#define MT_CLS_INRANGE_CONTACTNUMBER 0x0009
#define MT_CLS_NSMU 0x000a
/* reserved 0x0010 */
/* reserved 0x0011 */
#define MT_CLS_WIN_8 0x0012
#define MT_CLS_EXPORT_ALL_INPUTS 0x0013
#define MT_CLS_WIN_8_DUAL 0x0014
/* vendor specific classes */
#define MT_CLS_3M 0x0101
/* reserved 0x0102 */
#define MT_CLS_EGALAX 0x0103
#define MT_CLS_EGALAX_SERIAL 0x0104
#define MT_CLS_TOPSEED 0x0105
#define MT_CLS_PANASONIC 0x0106
#define MT_CLS_FLATFROG 0x0107
#define MT_CLS_GENERALTOUCH_TWOFINGERS 0x0108
#define MT_CLS_GENERALTOUCH_PWT_TENFINGERS 0x0109
#define MT_CLS_LG 0x010a
#define MT_CLS_ASUS 0x010b
#define MT_CLS_VTL 0x0110
#define MT_CLS_GOOGLE 0x0111
#define MT_CLS_RAZER_BLADE_STEALTH 0x0112
#define MT_CLS_SMART_TECH 0x0113
#define MT_DEFAULT_MAXCONTACT 10
#define MT_MAX_MAXCONTACT 250
/*
* Resync device and local timestamps after that many microseconds without
* receiving data.
*/
#define MAX_TIMESTAMP_INTERVAL 1000000
#define MT_USB_DEVICE(v, p) HID_DEVICE(BUS_USB, HID_GROUP_MULTITOUCH, v, p)
#define MT_BT_DEVICE(v, p) HID_DEVICE(BUS_BLUETOOTH, HID_GROUP_MULTITOUCH, v, p)
/*
* these device-dependent functions determine what slot corresponds
* to a valid contact that was just read.
*/
static int cypress_compute_slot(struct mt_application *application,
struct mt_usages *slot)
{
if (*slot->contactid != 0 || application->num_received == 0)
return *slot->contactid;
else
return -1;
}
static const struct mt_class mt_classes[] = {
{ .name = MT_CLS_DEFAULT,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_CONTACT_CNT_ACCURATE },
{ .name = MT_CLS_NSMU,
.quirks = MT_QUIRK_NOT_SEEN_MEANS_UP },
{ .name = MT_CLS_SERIAL,
.quirks = MT_QUIRK_ALWAYS_VALID},
{ .name = MT_CLS_CONFIDENCE,
.quirks = MT_QUIRK_VALID_IS_CONFIDENCE },
{ .name = MT_CLS_CONFIDENCE_CONTACT_ID,
.quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
MT_QUIRK_SLOT_IS_CONTACTID },
{ .name = MT_CLS_CONFIDENCE_MINUS_ONE,
.quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE },
{ .name = MT_CLS_DUAL_INRANGE_CONTACTID,
.quirks = MT_QUIRK_VALID_IS_INRANGE |
MT_QUIRK_SLOT_IS_CONTACTID,
.maxcontacts = 2 },
{ .name = MT_CLS_DUAL_INRANGE_CONTACTNUMBER,
.quirks = MT_QUIRK_VALID_IS_INRANGE |
MT_QUIRK_SLOT_IS_CONTACTNUMBER,
.maxcontacts = 2 },
{ .name = MT_CLS_INRANGE_CONTACTNUMBER,
.quirks = MT_QUIRK_VALID_IS_INRANGE |
MT_QUIRK_SLOT_IS_CONTACTNUMBER },
{ .name = MT_CLS_WIN_8,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_IGNORE_DUPLICATES |
MT_QUIRK_HOVERING |
MT_QUIRK_CONTACT_CNT_ACCURATE |
MT_QUIRK_STICKY_FINGERS |
MT_QUIRK_WIN8_PTP_BUTTONS },
{ .name = MT_CLS_EXPORT_ALL_INPUTS,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_CONTACT_CNT_ACCURATE,
.export_all_inputs = true },
{ .name = MT_CLS_WIN_8_DUAL,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_IGNORE_DUPLICATES |
MT_QUIRK_HOVERING |
MT_QUIRK_CONTACT_CNT_ACCURATE |
MT_QUIRK_WIN8_PTP_BUTTONS,
.export_all_inputs = true },
/*
* vendor specific classes
*/
{ .name = MT_CLS_3M,
.quirks = MT_QUIRK_VALID_IS_CONFIDENCE |
MT_QUIRK_SLOT_IS_CONTACTID |
MT_QUIRK_TOUCH_SIZE_SCALING,
.sn_move = 2048,
.sn_width = 128,
.sn_height = 128,
.maxcontacts = 60,
},
{ .name = MT_CLS_EGALAX,
.quirks = MT_QUIRK_SLOT_IS_CONTACTID |
MT_QUIRK_VALID_IS_INRANGE,
.sn_move = 4096,
.sn_pressure = 32,
},
{ .name = MT_CLS_EGALAX_SERIAL,
.quirks = MT_QUIRK_SLOT_IS_CONTACTID |
MT_QUIRK_ALWAYS_VALID,
.sn_move = 4096,
.sn_pressure = 32,
},
{ .name = MT_CLS_TOPSEED,
.quirks = MT_QUIRK_ALWAYS_VALID,
.is_indirect = true,
.maxcontacts = 2,
},
{ .name = MT_CLS_PANASONIC,
.quirks = MT_QUIRK_NOT_SEEN_MEANS_UP,
.maxcontacts = 4 },
{ .name = MT_CLS_GENERALTOUCH_TWOFINGERS,
.quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
MT_QUIRK_VALID_IS_INRANGE |
MT_QUIRK_SLOT_IS_CONTACTID,
.maxcontacts = 2
},
{ .name = MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
.quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
MT_QUIRK_SLOT_IS_CONTACTID
},
{ .name = MT_CLS_FLATFROG,
.quirks = MT_QUIRK_NOT_SEEN_MEANS_UP |
MT_QUIRK_NO_AREA,
.sn_move = 2048,
.maxcontacts = 40,
},
{ .name = MT_CLS_LG,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_FIX_CONST_CONTACT_ID |
MT_QUIRK_IGNORE_DUPLICATES |
MT_QUIRK_HOVERING |
MT_QUIRK_CONTACT_CNT_ACCURATE },
{ .name = MT_CLS_ASUS,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_CONTACT_CNT_ACCURATE |
MT_QUIRK_ASUS_CUSTOM_UP },
{ .name = MT_CLS_VTL,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_CONTACT_CNT_ACCURATE |
MT_QUIRK_FORCE_GET_FEATURE,
},
{ .name = MT_CLS_GOOGLE,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_CONTACT_CNT_ACCURATE |
MT_QUIRK_SLOT_IS_CONTACTID |
MT_QUIRK_HOVERING
},
{ .name = MT_CLS_RAZER_BLADE_STEALTH,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_IGNORE_DUPLICATES |
MT_QUIRK_HOVERING |
MT_QUIRK_CONTACT_CNT_ACCURATE |
MT_QUIRK_WIN8_PTP_BUTTONS,
},
{ .name = MT_CLS_SMART_TECH,
.quirks = MT_QUIRK_ALWAYS_VALID |
MT_QUIRK_IGNORE_DUPLICATES |
MT_QUIRK_CONTACT_CNT_ACCURATE |
MT_QUIRK_SEPARATE_APP_REPORT,
},
{ }
};
static ssize_t mt_show_quirks(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct hid_device *hdev = to_hid_device(dev);
struct mt_device *td = hid_get_drvdata(hdev);
return sprintf(buf, "%u\n", td->mtclass.quirks);
}
static ssize_t mt_set_quirks(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct hid_device *hdev = to_hid_device(dev);
struct mt_device *td = hid_get_drvdata(hdev);
struct mt_application *application;
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
td->mtclass.quirks = val;
list_for_each_entry(application, &td->applications, list) {
application->quirks = val;
if (!application->have_contact_count)
application->quirks &= ~MT_QUIRK_CONTACT_CNT_ACCURATE;
}
return count;
}
static DEVICE_ATTR(quirks, S_IWUSR | S_IRUGO, mt_show_quirks, mt_set_quirks);
static struct attribute *sysfs_attrs[] = {
&dev_attr_quirks.attr,
NULL
};
static const struct attribute_group mt_attribute_group = {
.attrs = sysfs_attrs
};
static void mt_get_feature(struct hid_device *hdev, struct hid_report *report)
{
int ret;
u32 size = hid_report_len(report);
u8 *buf;
/*
* Do not fetch the feature report if the device has been explicitly
* marked as non-capable.
*/
if (hdev->quirks & HID_QUIRK_NO_INIT_REPORTS)
return;
buf = hid_alloc_report_buf(report, GFP_KERNEL);
if (!buf)
return;
ret = hid_hw_raw_request(hdev, report->id, buf, size,
HID_FEATURE_REPORT, HID_REQ_GET_REPORT);
if (ret < 0) {
dev_warn(&hdev->dev, "failed to fetch feature %d\n",
report->id);
} else {
ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT, buf,
size, 0);
if (ret)
dev_warn(&hdev->dev, "failed to report feature\n");
}
kfree(buf);
}
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);
switch (usage->hid) {
case HID_DG_CONTACTMAX:
mt_get_feature(hdev, field->report);
td->maxcontacts = field->value[0];
if (!td->maxcontacts &&
field->logical_maximum <= MT_MAX_MAXCONTACT)
td->maxcontacts = field->logical_maximum;
if (td->mtclass.maxcontacts)
/* check if the maxcontacts is given by the class */
td->maxcontacts = td->mtclass.maxcontacts;
break;
case HID_DG_BUTTONTYPE:
if (usage->usage_index >= field->report_count) {
dev_err(&hdev->dev, "HID_DG_BUTTONTYPE out of range\n");
break;
}
mt_get_feature(hdev, field->report);
if (field->value[usage->usage_index] == MT_BUTTONTYPE_CLICKPAD)
td->is_buttonpad = true;
break;
case 0xff0000c5:
/* Retrieve the Win8 blob once to enable some devices */
if (usage->usage_index == 0)
mt_get_feature(hdev, field->report);
break;
}
}
static void set_abs(struct input_dev *input, unsigned int code,
struct hid_field *field, int snratio)
{
int fmin = field->logical_minimum;
int fmax = field->logical_maximum;
int fuzz = snratio ? (fmax - fmin) / snratio : 0;
input_set_abs_params(input, code, fmin, fmax, fuzz, 0);
input_abs_set_res(input, code, hidinput_calc_abs_res(field, code));
}
static struct mt_usages *mt_allocate_usage(struct hid_device *hdev,
struct mt_application *application)
{
struct mt_usages *usage;
usage = devm_kzalloc(&hdev->dev, sizeof(*usage), GFP_KERNEL);
if (!usage)
return NULL;
/* set some defaults so we do not need to check for null pointers */
usage->x = DEFAULT_ZERO;
usage->y = DEFAULT_ZERO;
usage->cx = DEFAULT_ZERO;
usage->cy = DEFAULT_ZERO;
usage->p = DEFAULT_ZERO;
usage->w = DEFAULT_ZERO;
usage->h = DEFAULT_ZERO;
usage->a = DEFAULT_ZERO;
usage->contactid = DEFAULT_ZERO;
usage->tip_state = DEFAULT_FALSE;
usage->inrange_state = DEFAULT_FALSE;
usage->confidence_state = DEFAULT_TRUE;
list_add_tail(&usage->list, &application->mt_usages);
return usage;
}
static struct mt_application *mt_allocate_application(struct mt_device *td,
struct hid_report *report)
{
unsigned int application = report->application;
struct mt_application *mt_application;
mt_application = devm_kzalloc(&td->hdev->dev, sizeof(*mt_application),
GFP_KERNEL);
if (!mt_application)
return NULL;
mt_application->application = application;
INIT_LIST_HEAD(&mt_application->mt_usages);
if (application == HID_DG_TOUCHSCREEN)
mt_application->mt_flags |= INPUT_MT_DIRECT;
/*
* Model touchscreens providing buttons as touchpads.
*/
if (application == HID_DG_TOUCHPAD) {
mt_application->mt_flags |= INPUT_MT_POINTER;
td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
}
mt_application->scantime = DEFAULT_ZERO;
mt_application->raw_cc = DEFAULT_ZERO;
mt_application->quirks = td->mtclass.quirks;
mt_application->report_id = report->id;
list_add_tail(&mt_application->list, &td->applications);
return mt_application;
}
static struct mt_application *mt_find_application(struct mt_device *td,
struct hid_report *report)
{
unsigned int application = report->application;
struct mt_application *tmp, *mt_application = NULL;
list_for_each_entry(tmp, &td->applications, list) {
if (application == tmp->application) {
if (!(td->mtclass.quirks & MT_QUIRK_SEPARATE_APP_REPORT) ||
tmp->report_id == report->id) {
mt_application = tmp;
break;
}
}
}
if (!mt_application)
mt_application = mt_allocate_application(td, report);
return mt_application;
}
static struct mt_report_data *mt_allocate_report_data(struct mt_device *td,
struct hid_report *report)
{
struct mt_report_data *rdata;
struct hid_field *field;
int r, n;
rdata = devm_kzalloc(&td->hdev->dev, sizeof(*rdata), GFP_KERNEL);
if (!rdata)
return NULL;
rdata->report = report;
rdata->application = mt_find_application(td, report);
if (!rdata->application) {
devm_kfree(&td->hdev->dev, rdata);
return NULL;
}
for (r = 0; r < report->maxfield; r++) {
field = report->field[r];
if (!(HID_MAIN_ITEM_VARIABLE & field->flags))
continue;
if (field->logical == HID_DG_FINGER || td->hdev->group != HID_GROUP_MULTITOUCH_WIN_8) {
for (n = 0; n < field->report_count; n++) {
if (field->usage[n].hid == HID_DG_CONTACTID) {
rdata->is_mt_collection = true;
break;
}
}
}
}
list_add_tail(&rdata->list, &td->reports);
return rdata;
}
static struct mt_report_data *mt_find_report_data(struct mt_device *td,
struct hid_report *report)
{
struct mt_report_data *tmp, *rdata = NULL;
list_for_each_entry(tmp, &td->reports, list) {
if (report == tmp->report) {
rdata = tmp;
break;
}
}
if (!rdata)
rdata = mt_allocate_report_data(td, report);
return rdata;
}
static void mt_store_field(struct hid_device *hdev,
struct mt_application *application,
__s32 *value,
size_t offset)
{
struct mt_usages *usage;
__s32 **target;
if (list_empty(&application->mt_usages))
usage = mt_allocate_usage(hdev, application);
else
usage = list_last_entry(&application->mt_usages,
struct mt_usages,
list);
if (!usage)
return;
target = (__s32 **)((char *)usage + offset);
/* the value has already been filled, create a new slot */
if (*target != DEFAULT_TRUE &&
*target != DEFAULT_FALSE &&
*target != DEFAULT_ZERO) {
if (usage->contactid == DEFAULT_ZERO ||
usage->x == DEFAULT_ZERO ||
usage->y == DEFAULT_ZERO) {
hid_dbg(hdev,
"ignoring duplicate usage on incomplete");
return;
}
usage = mt_allocate_usage(hdev, application);
if (!usage)
return;
target = (__s32 **)((char *)usage + offset);
}
*target = value;
}
#define MT_STORE_FIELD(__name) \
mt_store_field(hdev, app, \
&field->value[usage->usage_index], \
offsetof(struct mt_usages, __name))
static int mt_touch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_field *field, struct hid_usage *usage,
unsigned long **bit, int *max, struct mt_application *app)
{
struct mt_device *td = hid_get_drvdata(hdev);
struct mt_class *cls = &td->mtclass;
int code;
struct hid_usage *prev_usage = NULL;
/*
* Model touchscreens providing buttons as touchpads.
*/
if (field->application == HID_DG_TOUCHSCREEN &&
(usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON) {
app->mt_flags |= INPUT_MT_POINTER;
td->inputmode_value = MT_INPUTMODE_TOUCHPAD;
}
/* count the buttons on touchpads */
if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
app->buttons_count++;
if (usage->usage_index)
prev_usage = &field->usage[usage->usage_index - 1];
switch (usage->hid & HID_USAGE_PAGE) {
case HID_UP_GENDESK:
switch (usage->hid) {
case HID_GD_X:
if (prev_usage && (prev_usage->hid == usage->hid)) {
code = ABS_MT_TOOL_X;
MT_STORE_FIELD(cx);
} else {
code = ABS_MT_POSITION_X;
MT_STORE_FIELD(x);
}
set_abs(hi->input, code, field, cls->sn_move);
/*
* A system multi-axis that exports X and Y has a high
* chance of being used directly on a surface
*/
if (field->application == HID_GD_SYSTEM_MULTIAXIS) {
__set_bit(INPUT_PROP_DIRECT,
hi->input->propbit);
input_set_abs_params(hi->input,
ABS_MT_TOOL_TYPE,
MT_TOOL_DIAL,
MT_TOOL_DIAL, 0, 0);
}
return 1;
case HID_GD_Y:
if (prev_usage && (prev_usage->hid == usage->hid)) {
code = ABS_MT_TOOL_Y;
MT_STORE_FIELD(cy);
} else {
code = ABS_MT_POSITION_Y;
MT_STORE_FIELD(y);
}
set_abs(hi->input, code, field, cls->sn_move);
return 1;
}
return 0;
case HID_UP_DIGITIZER:
switch (usage->hid) {
case HID_DG_INRANGE:
if (app->quirks & MT_QUIRK_HOVERING) {
input_set_abs_params(hi->input,
ABS_MT_DISTANCE, 0, 1, 0, 0);
}
MT_STORE_FIELD(inrange_state);
return 1;
case HID_DG_CONFIDENCE:
if ((cls->name == MT_CLS_WIN_8 ||
cls->name == MT_CLS_WIN_8_DUAL) &&
(field->application == HID_DG_TOUCHPAD ||
field->application == HID_DG_TOUCHSCREEN))
app->quirks |= MT_QUIRK_CONFIDENCE;
if (app->quirks & MT_QUIRK_CONFIDENCE)
input_set_abs_params(hi->input,
ABS_MT_TOOL_TYPE,
MT_TOOL_FINGER,
MT_TOOL_PALM, 0, 0);
MT_STORE_FIELD(confidence_state);
return 1;
case HID_DG_TIPSWITCH:
if (field->application != HID_GD_SYSTEM_MULTIAXIS)
input_set_capability(hi->input,
EV_KEY, BTN_TOUCH);
MT_STORE_FIELD(tip_state);
return 1;
case HID_DG_CONTACTID:
MT_STORE_FIELD(contactid);
app->touches_by_report++;
return 1;
case HID_DG_WIDTH:
if (!(app->quirks & MT_QUIRK_NO_AREA))
set_abs(hi->input, ABS_MT_TOUCH_MAJOR, field,
cls->sn_width);
MT_STORE_FIELD(w);
return 1;
case HID_DG_HEIGHT:
if (!(app->quirks & MT_QUIRK_NO_AREA)) {
set_abs(hi->input, ABS_MT_TOUCH_MINOR, field,
cls->sn_height);
/*
* Only set ABS_MT_ORIENTATION if it is not
* already set by the HID_DG_AZIMUTH usage.
*/
if (!test_bit(ABS_MT_ORIENTATION,
hi->input->absbit))
input_set_abs_params(hi->input,
ABS_MT_ORIENTATION, 0, 1, 0, 0);
}
MT_STORE_FIELD(h);
return 1;
case HID_DG_TIPPRESSURE:
set_abs(hi->input, ABS_MT_PRESSURE, field,
cls->sn_pressure);
MT_STORE_FIELD(p);
return 1;
case HID_DG_SCANTIME:
input_set_capability(hi->input, EV_MSC, MSC_TIMESTAMP);
app->scantime = &field->value[usage->usage_index];
app->scantime_logical_max = field->logical_maximum;
return 1;
case HID_DG_CONTACTCOUNT:
app->have_contact_count = true;
app->raw_cc = &field->value[usage->usage_index];
return 1;
case HID_DG_AZIMUTH:
/*
* Azimuth has the range of [0, MAX) representing a full
* revolution. Set ABS_MT_ORIENTATION to a quarter of
* MAX according the definition of ABS_MT_ORIENTATION
*/
input_set_abs_params(hi->input, ABS_MT_ORIENTATION,
-field->logical_maximum / 4,
field->logical_maximum / 4,
cls->sn_move ?
field->logical_maximum / cls->sn_move : 0, 0);
MT_STORE_FIELD(a);
return 1;
case HID_DG_CONTACTMAX:
/* contact max are global to the report */
return -1;
case HID_DG_TOUCH:
/* Legacy devices use TIPSWITCH and not TOUCH.
* Let's just ignore this field. */
return -1;
}
/* let hid-input decide for the others */
return 0;
case HID_UP_BUTTON:
code = BTN_MOUSE + ((usage->hid - 1) & HID_USAGE);
/*
* MS PTP spec says that external buttons left and right have
* usages 2 and 3.
*/
if ((app->quirks & MT_QUIRK_WIN8_PTP_BUTTONS) &&
field->application == HID_DG_TOUCHPAD &&
(usage->hid & HID_USAGE) > 1)
code--;
if (field->application == HID_GD_SYSTEM_MULTIAXIS)
code = BTN_0 + ((usage->hid - 1) & HID_USAGE);
hid_map_usage(hi, usage, bit, max, EV_KEY, code);
if (!*bit)
return -1;
input_set_capability(hi->input, EV_KEY, code);
return 1;
case 0xff000000:
/* we do not want to map these: no input-oriented meaning */
return -1;
}
return 0;
}
static int mt_compute_slot(struct mt_device *td, struct mt_application *app,
struct mt_usages *slot,
struct input_dev *input)
{
__s32 quirks = app->quirks;
if (quirks & MT_QUIRK_SLOT_IS_CONTACTID)
return *slot->contactid;
if (quirks & MT_QUIRK_CYPRESS)
return cypress_compute_slot(app, slot);
if (quirks & MT_QUIRK_SLOT_IS_CONTACTNUMBER)
return app->num_received;
if (quirks & MT_QUIRK_SLOT_IS_CONTACTID_MINUS_ONE)
return *slot->contactid - 1;
return input_mt_get_slot_by_key(input, *slot->contactid);
}
static void mt_release_pending_palms(struct mt_device *td,
struct mt_application *app,
struct input_dev *input)
{
int slotnum;
bool need_sync = false;
for_each_set_bit(slotnum, app->pending_palm_slots, td->maxcontacts) {
clear_bit(slotnum, app->pending_palm_slots);
input_mt_slot(input, slotnum);
input_mt_report_slot_state(input, MT_TOOL_PALM, false);
need_sync = true;
}
if (need_sync) {
input_mt_sync_frame(input);
input_sync(input);
}
}
/*
* this function is called when a whole packet has been received and processed,
* so that it can decide what to send to the input layer.
*/
static void mt_sync_frame(struct mt_device *td, struct mt_application *app,
struct input_dev *input)
{
if (app->quirks & MT_QUIRK_WIN8_PTP_BUTTONS)
input_event(input, EV_KEY, BTN_LEFT, app->left_button_state);
input_mt_sync_frame(input);
input_event(input, EV_MSC, MSC_TIMESTAMP, app->timestamp);
input_sync(input);
mt_release_pending_palms(td, app, input);
app->num_received = 0;
app->left_button_state = 0;
if (test_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags))
set_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags);
else
clear_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags);
clear_bit(MT_IO_FLAGS_ACTIVE_SLOTS, &td->mt_io_flags);
}
static int mt_compute_timestamp(struct mt_application *app, __s32 value)
{
long delta = value - app->prev_scantime;
unsigned long jdelta = jiffies_to_usecs(jiffies - app->jiffies);
app->jiffies = jiffies;
if (delta < 0)
delta += app->scantime_logical_max;
/* HID_DG_SCANTIME is expressed in 100us, we want it in us. */
delta *= 100;
if (jdelta > MAX_TIMESTAMP_INTERVAL)
/* No data received for a while, resync the timestamp. */
return 0;
else
return app->timestamp + delta;
}
static int mt_touch_event(struct hid_device *hid, struct hid_field *field,
struct hid_usage *usage, __s32 value)
{
/* we will handle the hidinput part later, now remains hiddev */
if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
hid->hiddev_hid_event(hid, field, usage, value);
return 1;
}
static int mt_process_slot(struct mt_device *td, struct input_dev *input,
struct mt_application *app,
struct mt_usages *slot)
{
struct input_mt *mt = input->mt;
__s32 quirks = app->quirks;
bool valid = true;
bool confidence_state = true;
bool inrange_state = false;
int active;
int slotnum;
int tool = MT_TOOL_FINGER;
if (!slot)
return -EINVAL;
if ((quirks & MT_QUIRK_CONTACT_CNT_ACCURATE) &&
app->num_received >= app->num_expected)
return -EAGAIN;
if (!(quirks & MT_QUIRK_ALWAYS_VALID)) {
if (quirks & MT_QUIRK_VALID_IS_INRANGE)
valid = *slot->inrange_state;
if (quirks & MT_QUIRK_NOT_SEEN_MEANS_UP)
valid = *slot->tip_state;
if (quirks & MT_QUIRK_VALID_IS_CONFIDENCE)