a36bdfc2b6
It is used by many pre- and post- 2014 eGalax touchscreens. Tested by: Mark Kane <mark_AT_kane_DOT_mn> MFC after: 2 week
266 lines
8.9 KiB
C
266 lines
8.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2020 Vladimir Kondratyev <wulf@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _HIDMAP_H_
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#define _HIDMAP_H_
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#include <sys/param.h>
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#include <dev/hid/hid.h>
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#define HIDMAP_MAX_MAPS 4
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struct hid_device_id;
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struct hidmap_hid_item;
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struct hidmap_item;
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struct hidmap;
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enum hidmap_cb_state {
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HIDMAP_CB_IS_PROBING,
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HIDMAP_CB_IS_ATTACHING,
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HIDMAP_CB_IS_RUNNING,
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HIDMAP_CB_IS_DETACHING,
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};
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#define HIDMAP_KEY_NULL 0xFF /* Special event code to discard input */
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/* Third parameter of hidmap callback has different type depending on state */
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union hidmap_cb_ctx {
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struct hid_item *hi; /* Probe- and attach-stage callbacks */
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int32_t data; /* Run-stage callbacks */
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uint8_t rid; /* Run-stage finalizing callbacks */
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};
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#define HIDMAP_CB_ARGS \
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struct hidmap *hm, struct hidmap_hid_item *hi, union hidmap_cb_ctx ctx
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typedef int hidmap_cb_t(HIDMAP_CB_ARGS);
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/* These helpers can be used at any stage of any callbacks */
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#define HIDMAP_CB_GET_STATE(...) \
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((hm == NULL) ? HIDMAP_CB_IS_PROBING : hm->cb_state)
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#define HIDMAP_CB_GET_DEV(...) \
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(hm == NULL ? NULL : hm->dev)
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#define HIDMAP_CB_GET_SOFTC(...) \
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(hm == NULL ? NULL : device_get_softc(hm->dev))
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#define HIDMAP_CB_GET_EVDEV(...) \
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(hm == NULL ? NULL : hm->evdev)
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#define HIDMAP_CB_UDATA (hi->udata)
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#define HIDMAP_CB_UDATA64 (hi->udata64)
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/* Special helpers for run-stage of finalizing callbacks */
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#define HIDMAP_CB_GET_RID(...) (ctx.rid)
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#define HIDMAP_CB_GET_DATA(loc) \
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hid_get_data(hm->intr_buf, hm->intr_len, (loc))
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#define HIDMAP_CB_GET_UDATA(loc) \
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hid_get_udata(hm->intr_buf, hm->intr_len, (loc))
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enum hidmap_relabs {
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HIDMAP_RELABS_ANY = 0,
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HIDMAP_RELATIVE,
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HIDMAP_ABSOLUTE,
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};
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struct hidmap_item {
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union {
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struct {
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uint16_t type; /* Evdev event type */
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uint16_t code; /* Evdev event code */
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uint16_t fuzz; /* Evdev event fuzz */
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uint16_t flat; /* Evdev event flat */
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};
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hidmap_cb_t *cb; /* Reporting callback */
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};
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int32_t usage; /* HID usage (base) */
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uint16_t nusages; /* number of usages */
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bool required:1; /* Required by driver */
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enum hidmap_relabs relabs:2;
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bool has_cb:1;
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bool final_cb:1;
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bool invert_value:1;
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bool forbidden:1; /* Forbidden by driver */
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u_int reserved:9;
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};
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#define HIDMAP_ANY(_page, _usage, _type, _code) \
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.usage = HID_USAGE2((_page), (_usage)), \
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.nusages = 1, \
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.type = (_type), \
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.code = (_code)
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#define HIDMAP_ANY_RANGE(_page, _usage_from, _usage_to, _type, _code) \
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.usage = HID_USAGE2((_page), (_usage_from)), \
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.nusages = (_usage_to) - (_usage_from) + 1, \
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.type = (_type), \
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.code = (_code)
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#define HIDMAP_ANY_CB(_page, _usage, _callback) \
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.usage = HID_USAGE2((_page), (_usage)), \
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.nusages = 1, \
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.cb = (_callback), \
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.has_cb = true
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#define HIDMAP_ANY_CB_RANGE(_page, _usage_from, _usage_to, _callback) \
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.usage = HID_USAGE2((_page), (_usage_from)), \
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.nusages = (_usage_to) - (_usage_from) + 1, \
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.cb = (_callback), \
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.has_cb = true
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#define HIDMAP_KEY(_page, _usage, _code) \
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HIDMAP_ANY((_page), (_usage), EV_KEY, (_code)), \
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.relabs = HIDMAP_RELABS_ANY
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#define HIDMAP_KEY_RANGE(_page, _ufrom, _uto, _code) \
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HIDMAP_ANY_RANGE((_page), (_ufrom), (_uto), EV_KEY, (_code)), \
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.relabs = HIDMAP_RELABS_ANY
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#define HIDMAP_REL(_page, _usage, _code) \
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HIDMAP_ANY((_page), (_usage), EV_REL, (_code)), \
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.relabs = HIDMAP_RELATIVE
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#define HIDMAP_ABS(_page, _usage, _code) \
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HIDMAP_ANY((_page), (_usage), EV_ABS, (_code)), \
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.relabs = HIDMAP_ABSOLUTE
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#define HIDMAP_SW(_page, _usage, _code) \
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HIDMAP_ANY((_page), (_usage), EV_SW, (_code)), \
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.relabs = HIDMAP_RELABS_ANY
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#define HIDMAP_REL_CB(_page, _usage, _callback) \
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HIDMAP_ANY_CB((_page), (_usage), (_callback)), \
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.relabs = HIDMAP_RELATIVE
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#define HIDMAP_ABS_CB(_page, _usage, _callback) \
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HIDMAP_ANY_CB((_page), (_usage), (_callback)), \
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.relabs = HIDMAP_ABSOLUTE
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/*
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* Special callback function which is not tied to particular HID input usage
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* but called at the end evdev properties setting or interrupt handler
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* just before evdev_register() or evdev_sync() calls.
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*/
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#define HIDMAP_FINAL_CB(_callback) \
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HIDMAP_ANY_CB(0, 0, (_callback)), .final_cb = true
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enum hidmap_type {
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HIDMAP_TYPE_FINALCB = 0,/* No HID item associated. Runs unconditionally
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* at the end of other items processing */
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HIDMAP_TYPE_CALLBACK, /* HID item is reported with user callback */
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HIDMAP_TYPE_VARIABLE, /* HID item is variable (single usage) */
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HIDMAP_TYPE_VAR_NULLST, /* HID item is null state variable */
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HIDMAP_TYPE_ARR_LIST, /* HID item is array with list of usages */
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HIDMAP_TYPE_ARR_RANGE, /* Array with range (min;max) of usages */
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};
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struct hidmap_hid_item {
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union {
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hidmap_cb_t *cb; /* Callback */
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struct { /* Variable */
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uint16_t evtype; /* Evdev event type */
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uint16_t code; /* Evdev event code */
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};
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uint16_t *codes; /* Array list map type */
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int32_t umin; /* Array range map type */
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};
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union {
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void *udata; /* Callback private context */
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uint64_t udata64;
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int32_t last_val; /* Last reported value (var) */
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uint16_t last_key; /* Last reported key (array) */
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};
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struct hid_location loc; /* HID item location */
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int32_t lmin; /* HID item logical minimum */
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int32_t lmax; /* HID item logical maximum */
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enum hidmap_type type:8;
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uint8_t id; /* Report ID */
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bool invert_value;
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};
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struct hidmap {
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device_t dev;
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struct evdev_dev *evdev;
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struct evdev_methods evdev_methods;
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/* Scatter-gather list of maps */
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int nmaps;
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uint32_t nmap_items[HIDMAP_MAX_MAPS];
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const struct hidmap_item *map[HIDMAP_MAX_MAPS];
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/* List of preparsed HID items */
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uint32_t nhid_items;
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struct hidmap_hid_item *hid_items;
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/* Key event merging buffers */
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uint8_t *key_press;
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uint8_t *key_rel;
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uint16_t key_min;
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uint16_t key_max;
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int *debug_var;
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int debug_level;
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enum hidmap_cb_state cb_state;
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void * intr_buf;
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hid_size_t intr_len;
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};
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typedef uint8_t * hidmap_caps_t;
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#define HIDMAP_CAPS_SZ(nitems) howmany((nitems), 8)
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#define HIDMAP_CAPS(name, map) uint8_t (name)[HIDMAP_CAPS_SZ(nitems(map))]
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static inline bool
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hidmap_test_cap(hidmap_caps_t caps, int cap)
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{
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return (isset(caps, cap) != 0);
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}
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/*
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* It is safe to call any of following procedures in device_probe context
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* that makes possible to write probe-only drivers with attach/detach handlers
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* inherited from hidmap. See hcons and hsctrl drivers for example.
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*/
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static inline void
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hidmap_set_dev(struct hidmap *hm, device_t dev)
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{
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hm->dev = dev;
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}
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/* Hack to avoid #ifdef-ing of hidmap_set_debug_var in hidmap based drivers */
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#ifdef HID_DEBUG
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#define hidmap_set_debug_var(h, d) _hidmap_set_debug_var((h), (d))
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#else
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#define hidmap_set_debug_var(...)
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#endif
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void _hidmap_set_debug_var(struct hidmap *hm, int *debug_var);
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#define HIDMAP_ADD_MAP(hm, map, caps) \
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hidmap_add_map((hm), (map), nitems(map), (caps))
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uint32_t hidmap_add_map(struct hidmap *hm, const struct hidmap_item *map,
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int nitems_map, hidmap_caps_t caps);
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/* Versions of evdev_* functions capable to merge key events with same codes */
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void hidmap_support_key(struct hidmap *hm, uint16_t key);
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void hidmap_push_key(struct hidmap *hm, uint16_t key, int32_t value);
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void hidmap_intr(void *context, void *buf, hid_size_t len);
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#define HIDMAP_PROBE(hm, dev, id, map, suffix) \
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hidmap_probe((hm), (dev), (id), nitems(id), (map), nitems(map), \
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(suffix), NULL)
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int hidmap_probe(struct hidmap* hm, device_t dev,
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const struct hid_device_id *id, int nitems_id,
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const struct hidmap_item *map, int nitems_map,
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const char *suffix, hidmap_caps_t caps);
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int hidmap_attach(struct hidmap *hm);
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int hidmap_detach(struct hidmap *hm);
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#endif /* _HIDMAP_H_ */
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