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freebsd-dev/usr.sbin/bluetooth/bthidd/hid.c
Vladimir Kondratyev 44af5666d9 bthidd(8): Add evdev protocol support for bluetooth keyboards and mouses 
User-visible changes:

"-u" is added to to list of command line options supported by bthidd.
Use it to enable evdev support. uinput and evdev modules should be
kld-loaded or compiled into the kernel in that case.

bthidd_evdev_support rc.conf variable is added to control enabling of
evdev support in bthidd startup script. Possible values are: "YES", "NO",
"AUTO"(default). Setting bthidd_evdev_support to "AUTO" inserts "-u" option
if kernel is compiled with EVDEV_SUPPORT option enabled.

Support for consumer HID usage page keyboard events is implemented. Most of
them are available only through evdev protocol.

kern.evdev.rcpt_mask sysctl is checked, so "sysctl kern.evdev.rcpt_mask=12"
should be executed if EVDEV_SUPPORT is compiled into kernel.

It is recommended to regenerate bthidd.conf entries with bthidcontrol(8)
"Query" command to set user-friendly names of bluetooth devices.

Reviewed by:	emax, gonzo, wblock (docs), bcr (docs, early version)
Differential Revision:	https://reviews.freebsd.org/D13456
2018-04-30 12:16:54 +00:00

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/*
* hid.c
*/
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2006 Maksim Yevmenkin <m_evmenkin@yahoo.com>
* All rights reserved.
*
* 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.
*
* $Id: hid.c,v 1.5 2006/09/07 21:06:53 max Exp $
* $FreeBSD$
*/
#include <sys/consio.h>
#include <sys/mouse.h>
#include <sys/queue.h>
#include <assert.h>
#define L2CAP_SOCKET_CHECKED
#include <bluetooth.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbhid.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <usbhid.h>
#include "bthid_config.h"
#include "bthidd.h"
#include "btuinput.h"
#include "kbd.h"
/*
* Inoffical and unannounced report ids for Apple Mice and trackpad
*/
#define TRACKPAD_REPORT_ID 0x28
#define AMM_REPORT_ID 0x29
#define BATT_STAT_REPORT_ID 0x30
#define BATT_STRENGTH_REPORT_ID 0x47
#define SURFACE_REPORT_ID 0x61
/*
* Apple magic mouse (AMM) specific device state
*/
#define AMM_MAX_BUTTONS 16
struct apple_state {
int y [AMM_MAX_BUTTONS];
int button_state;
};
#define MAGIC_MOUSE(D) (((D)->vendor_id == 0x5ac) && ((D)->product_id == 0x30d))
#define AMM_BASIC_BLOCK 5
#define AMM_FINGER_BLOCK 8
#define AMM_VALID_REPORT(L) (((L) >= AMM_BASIC_BLOCK) && \
((L) <= 16*AMM_FINGER_BLOCK + AMM_BASIC_BLOCK) && \
((L) % AMM_FINGER_BLOCK) == AMM_BASIC_BLOCK)
#define AMM_WHEEL_SPEED 100
/*
* Probe for per-device initialisation
*/
void
hid_initialise(bthid_session_p s)
{
hid_device_p hid_device = get_hid_device(&s->bdaddr);
if (hid_device && MAGIC_MOUSE(hid_device)) {
/* Magic report to enable trackpad on Apple's Magic Mouse */
static uint8_t rep[] = {0x53, 0xd7, 0x01};
if ((s->ctx = calloc(1, sizeof(struct apple_state))) == NULL)
return;
write(s->ctrl, rep, 3);
}
}
/*
* Process data from control channel
*/
int32_t
hid_control(bthid_session_p s, uint8_t *data, int32_t len)
{
assert(s != NULL);
assert(data != NULL);
assert(len > 0);
switch (data[0] >> 4) {
case 0: /* Handshake (response to command) */
if (data[0] & 0xf)
syslog(LOG_ERR, "Got handshake message with error " \
"response 0x%x from %s",
data[0], bt_ntoa(&s->bdaddr, NULL));
break;
case 1: /* HID Control */
switch (data[0] & 0xf) {
case 0: /* NOP */
break;
case 1: /* Hard reset */
case 2: /* Soft reset */
syslog(LOG_WARNING, "Device %s requested %s reset",
bt_ntoa(&s->bdaddr, NULL),
((data[0] & 0xf) == 1)? "hard" : "soft");
break;
case 3: /* Suspend */
syslog(LOG_NOTICE, "Device %s requested Suspend",
bt_ntoa(&s->bdaddr, NULL));
break;
case 4: /* Exit suspend */
syslog(LOG_NOTICE, "Device %s requested Exit Suspend",
bt_ntoa(&s->bdaddr, NULL));
break;
case 5: /* Virtual cable unplug */
syslog(LOG_NOTICE, "Device %s unplugged virtual cable",
bt_ntoa(&s->bdaddr, NULL));
session_close(s);
break;
default:
syslog(LOG_WARNING, "Device %s sent unknown " \
"HID_Control message 0x%x",
bt_ntoa(&s->bdaddr, NULL), data[0]);
break;
}
break;
default:
syslog(LOG_WARNING, "Got unexpected message 0x%x on Control " \
"channel from %s", data[0], bt_ntoa(&s->bdaddr, NULL));
break;
}
return (0);
}
/*
* Process data from the interrupt channel
*/
int32_t
hid_interrupt(bthid_session_p s, uint8_t *data, int32_t len)
{
hid_device_p hid_device;
hid_data_t d;
hid_item_t h;
int32_t report_id, usage, page, val,
mouse_x, mouse_y, mouse_z, mouse_t, mouse_butt,
mevents, kevents, i;
assert(s != NULL);
assert(s->srv != NULL);
assert(data != NULL);
if (len < 3) {
syslog(LOG_ERR, "Got short message (%d bytes) on Interrupt " \
"channel from %s", len, bt_ntoa(&s->bdaddr, NULL));
return (-1);
}
if (data[0] != 0xa1) {
syslog(LOG_ERR, "Got unexpected message 0x%x on " \
"Interrupt channel from %s",
data[0], bt_ntoa(&s->bdaddr, NULL));
return (-1);
}
report_id = data[1];
data ++;
len --;
hid_device = get_hid_device(&s->bdaddr);
assert(hid_device != NULL);
mouse_x = mouse_y = mouse_z = mouse_t = mouse_butt = 0;
mevents = kevents = 0;
for (d = hid_start_parse(hid_device->desc, 1 << hid_input, -1);
hid_get_item(d, &h) > 0; ) {
if ((h.flags & HIO_CONST) || (h.report_ID != report_id) ||
(h.kind != hid_input))
continue;
page = HID_PAGE(h.usage);
val = hid_get_data(data, &h);
/*
* When the input field is an array and the usage is specified
* with a range instead of an ID, we have to derive the actual
* usage by using the item value as an index in the usage range
* list.
*/
if ((h.flags & HIO_VARIABLE)) {
usage = HID_USAGE(h.usage);
} else {
const uint32_t usage_offset = val - h.logical_minimum;
usage = HID_USAGE(h.usage_minimum + usage_offset);
}
switch (page) {
case HUP_GENERIC_DESKTOP:
switch (usage) {
case HUG_X:
mouse_x = val;
mevents ++;
break;
case HUG_Y:
mouse_y = val;
mevents ++;
break;
case HUG_WHEEL:
mouse_z = -val;
mevents ++;
break;
case HUG_SYSTEM_SLEEP:
if (val)
syslog(LOG_NOTICE, "Sleep button pressed");
break;
}
break;
case HUP_KEYBOARD:
kevents ++;
if (h.flags & HIO_VARIABLE) {
if (val && usage < kbd_maxkey())
bit_set(s->keys1, usage);
} else {
if (val && val < kbd_maxkey())
bit_set(s->keys1, val);
for (i = 1; i < h.report_count; i++) {
h.pos += h.report_size;
val = hid_get_data(data, &h);
if (val && val < kbd_maxkey())
bit_set(s->keys1, val);
}
}
break;
case HUP_BUTTON:
if (usage != 0) {
if (usage == 2)
usage = 3;
else if (usage == 3)
usage = 2;
mouse_butt |= (val << (usage - 1));
mevents ++;
}
break;
case HUP_CONSUMER:
if (hid_device->keyboard && s->srv->uinput) {
if (h.flags & HIO_VARIABLE) {
uinput_rep_cons(s->ukbd, usage, !!val);
} else {
if (s->consk > 0)
uinput_rep_cons(s->ukbd,
s->consk, 0);
if (uinput_rep_cons(s->ukbd, val, 1)
== 0)
s->consk = val;
}
}
if (!val)
break;
switch (usage) {
case HUC_AC_PAN:
/* Horizontal scroll */
mouse_t = val;
mevents ++;
val = 0;
break;
case 0xb5: /* Scan Next Track */
val = 0x19;
break;
case 0xb6: /* Scan Previous Track */
val = 0x10;
break;
case 0xb7: /* Stop */
val = 0x24;
break;
case 0xcd: /* Play/Pause */
val = 0x22;
break;
case 0xe2: /* Mute */
val = 0x20;
break;
case 0xe9: /* Volume Up */
val = 0x30;
break;
case 0xea: /* Volume Down */
val = 0x2E;
break;
case 0x183: /* Media Select */
val = 0x6D;
break;
case 0x018a: /* Mail */
val = 0x6C;
break;
case 0x192: /* Calculator */
val = 0x21;
break;
case 0x194: /* My Computer */
val = 0x6B;
break;
case 0x221: /* WWW Search */
val = 0x65;
break;
case 0x223: /* WWW Home */
val = 0x32;
break;
case 0x224: /* WWW Back */
val = 0x6A;
break;
case 0x225: /* WWW Forward */
val = 0x69;
break;
case 0x226: /* WWW Stop */
val = 0x68;
break;
case 0x227: /* WWW Refresh */
val = 0x67;
break;
case 0x22a: /* WWW Favorites */
val = 0x66;
break;
default:
val = 0;
break;
}
/* XXX FIXME - UGLY HACK */
if (val != 0) {
if (hid_device->keyboard) {
int32_t buf[4] = { 0xe0, val,
0xe0, val|0x80 };
assert(s->vkbd != -1);
write(s->vkbd, buf, sizeof(buf));
} else
syslog(LOG_ERR, "Keyboard events " \
"received from non-keyboard " \
"device %s. Please report",
bt_ntoa(&s->bdaddr, NULL));
}
break;
case HUP_MICROSOFT:
switch (usage) {
case 0xfe01:
if (!hid_device->battery_power)
break;
switch (val) {
case 1:
syslog(LOG_INFO, "Battery is OK on %s",
bt_ntoa(&s->bdaddr, NULL));
break;
case 2:
syslog(LOG_NOTICE, "Low battery on %s",
bt_ntoa(&s->bdaddr, NULL));
break;
case 3:
syslog(LOG_WARNING, "Very low battery "\
"on %s",
bt_ntoa(&s->bdaddr, NULL));
break;
}
break;
}
break;
}
}
hid_end_parse(d);
/*
* Apple adheres to no standards and sends reports it does
* not introduce in its hid descriptor for its magic mouse.
* Handle those reports here.
*/
if (MAGIC_MOUSE(hid_device) && s->ctx) {
struct apple_state *c = (struct apple_state *)s->ctx;
int firm = 0, middle = 0;
int16_t v;
data++, len--; /* Chomp report_id */
if (report_id != AMM_REPORT_ID || !AMM_VALID_REPORT(len))
goto check_middle_button;
/*
* The basics. When touches are detected, no normal mouse
* reports are sent. Collect clicks and dx/dy
*/
if (data[2] & 1)
mouse_butt |= 0x1;
if (data[2] & 2)
mouse_butt |= 0x4;
if ((v = data[0] + ((data[2] & 0x0C) << 6)))
mouse_x += ((int16_t)(v << 6)) >> 6, mevents++;
if ((v = data[1] + ((data[2] & 0x30) << 4)))
mouse_y += ((int16_t)(v << 6)) >> 6, mevents++;
/*
* The hard part: accumulate touch events and emulate middle
*/
for (data += AMM_BASIC_BLOCK, len -= AMM_BASIC_BLOCK;
len >= AMM_FINGER_BLOCK;
data += AMM_FINGER_BLOCK, len -= AMM_FINGER_BLOCK) {
int x, y, z, force, id;
v = data[0] | ((data[1] & 0xf) << 8);
x = ((int16_t)(v << 4)) >> 4;
v = (data[1] >> 4) | (data[2] << 4);
y = -(((int16_t)(v << 4)) >> 4);
force = data[5] & 0x3f;
id = 0xf & ((data[5] >> 6) | (data[6] << 2));
z = (y - c->y[id]) / AMM_WHEEL_SPEED;
switch ((data[7] >> 4) & 0x7) { /* Phase */
case 3: /* First touch */
c->y[id] = y;
break;
case 4: /* Touch dragged */
if (z) {
mouse_z += z;
c->y[id] += z * AMM_WHEEL_SPEED;
mevents++;
}
break;
default:
break;
}
/* Count firm touches vs. firm+middle touches */
if (force >= 8 && ++firm && x > -350 && x < 350)
++middle;
}
/*
* If a new click is registered by mouse and there are firm
* touches which are all in center, make it a middle click
*/
if (mouse_butt && !c->button_state && firm && middle == firm)
mouse_butt = 0x2;
/*
* If we're still clicking and have converted the click
* to a middle click, keep it middle clicking
*/
check_middle_button:
if (mouse_butt && c->button_state == 0x2)
mouse_butt = 0x2;
if (mouse_butt != c->button_state)
c->button_state = mouse_butt, mevents++;
}
/*
* XXX FIXME Feed keyboard events into kernel.
* The code below works, bit host also needs to track
* and handle repeat.
*
* Key repeat currently works in X, but not in console.
*/
if (kevents > 0) {
if (hid_device->keyboard) {
assert(s->vkbd != -1);
kbd_process_keys(s);
} else
syslog(LOG_ERR, "Keyboard events received from " \
"non-keyboard device %s. Please report",
bt_ntoa(&s->bdaddr, NULL));
}
/*
* XXX FIXME Feed mouse events into kernel.
* The code block below works, but it is not good enough.
* Need to track double-clicks etc.
*
* Double click currently works in X, but not in console.
*/
if (mevents > 0) {
struct mouse_info mi;
memset(&mi, 0, sizeof(mi));
mi.operation = MOUSE_ACTION;
mi.u.data.buttons = mouse_butt;
/* translate T-axis into button presses */
if (mouse_t != 0) {
mi.u.data.buttons |= 1 << (mouse_t > 0 ? 6 : 5);
if (ioctl(s->srv->cons, CONS_MOUSECTL, &mi) < 0)
syslog(LOG_ERR, "Could not process mouse " \
"events from %s. %s (%d)",
bt_ntoa(&s->bdaddr, NULL),
strerror(errno), errno);
}
mi.u.data.x = mouse_x;
mi.u.data.y = mouse_y;
mi.u.data.z = mouse_z;
mi.u.data.buttons = mouse_butt;
if (ioctl(s->srv->cons, CONS_MOUSECTL, &mi) < 0)
syslog(LOG_ERR, "Could not process mouse events from " \
"%s. %s (%d)", bt_ntoa(&s->bdaddr, NULL),
strerror(errno), errno);
if (hid_device->mouse && s->srv->uinput &&
uinput_rep_mouse(s->umouse, mouse_x, mouse_y, mouse_z,
mouse_t, mouse_butt, s->obutt) < 0)
syslog(LOG_ERR, "Could not process mouse events from " \
"%s. %s (%d)", bt_ntoa(&s->bdaddr, NULL),
strerror(errno), errno);
s->obutt = mouse_butt;
}
return (0);
}
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