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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
*
* BlueZ - Bluetooth protocol stack for Linux
*
* Copyright (C) 2014 Intel Corporation. All rights reserved.
*
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include "src/shared/io.h"
#include "src/shared/util.h"
#include "src/shared/queue.h"
#include "src/shared/uhid.h"
#define UHID_DEVICE_FILE "/dev/uhid"
struct bt_uhid {
int ref_count;
struct io *io;
unsigned int notify_id;
struct queue *notify_list;
};
struct uhid_notify {
unsigned int id;
uint32_t event;
bt_uhid_callback_t func;
void *user_data;
};
static void uhid_free(struct bt_uhid *uhid)
{
if (uhid->io)
io_destroy(uhid->io);
if (uhid->notify_list)
queue_destroy(uhid->notify_list, free);
free(uhid);
}
static void notify_handler(void *data, void *user_data)
{
struct uhid_notify *notify = data;
struct uhid_event *ev = user_data;
if (notify->event != ev->type)
return;
if (notify->func)
notify->func(ev, notify->user_data);
}
static bool uhid_read_handler(struct io *io, void *user_data)
{
struct bt_uhid *uhid = user_data;
int fd;
ssize_t len;
struct uhid_event ev;
fd = io_get_fd(io);
if (fd < 0)
return false;
memset(&ev, 0, sizeof(ev));
len = read(fd, &ev, sizeof(ev));
if (len < 0)
return false;
if ((size_t) len < sizeof(ev.type))
return false;
queue_foreach(uhid->notify_list, notify_handler, &ev);
return true;
}
struct bt_uhid *bt_uhid_new_default(void)
{
struct bt_uhid *uhid;
int fd;
fd = open(UHID_DEVICE_FILE, O_RDWR | O_CLOEXEC);
if (fd < 0)
return NULL;
uhid = bt_uhid_new(fd);
if (!uhid) {
close(fd);
return NULL;
}
io_set_close_on_destroy(uhid->io, true);
return uhid;
}
struct bt_uhid *bt_uhid_new(int fd)
{
struct bt_uhid *uhid;
uhid = new0(struct bt_uhid, 1);
uhid->io = io_new(fd);
if (!uhid->io)
goto failed;
uhid->notify_list = queue_new();
if (!io_set_read_handler(uhid->io, uhid_read_handler, uhid, NULL))
goto failed;
return bt_uhid_ref(uhid);
failed:
uhid_free(uhid);
return NULL;
}
struct bt_uhid *bt_uhid_ref(struct bt_uhid *uhid)
{
if (!uhid)
return NULL;
__sync_fetch_and_add(&uhid->ref_count, 1);
return uhid;
}
void bt_uhid_unref(struct bt_uhid *uhid)
{
if (!uhid)
return;
if (__sync_sub_and_fetch(&uhid->ref_count, 1))
return;
uhid_free(uhid);
}
bool bt_uhid_set_close_on_unref(struct bt_uhid *uhid, bool do_close)
{
if (!uhid || !uhid->io)
return false;
io_set_close_on_destroy(uhid->io, do_close);
return true;
}
unsigned int bt_uhid_register(struct bt_uhid *uhid, uint32_t event,
bt_uhid_callback_t func, void *user_data)
{
struct uhid_notify *notify;
if (!uhid)
return 0;
notify = new0(struct uhid_notify, 1);
notify->id = uhid->notify_id++;
notify->event = event;
notify->func = func;
notify->user_data = user_data;
if (!queue_push_tail(uhid->notify_list, notify)) {
free(notify);
return 0;
}
return notify->id;
}
static bool match_notify_id(const void *a, const void *b)
{
const struct uhid_notify *notify = a;
unsigned int id = PTR_TO_UINT(b);
return notify->id == id;
}
bool bt_uhid_unregister(struct bt_uhid *uhid, unsigned int id)
{
struct uhid_notify *notify;
if (!uhid || !id)
return false;
notify = queue_remove_if(uhid->notify_list, match_notify_id,
UINT_TO_PTR(id));
if (!notify)
return false;
free(notify);
return true;
}
bool bt_uhid_unregister_all(struct bt_uhid *uhid)
{
if (!uhid)
return false;
queue_remove_all(uhid->notify_list, NULL, NULL, free);
return true;
}
int bt_uhid_send(struct bt_uhid *uhid, const struct uhid_event *ev)
{
ssize_t len;
struct iovec iov;
if (!uhid->io)
return -ENOTCONN;
iov.iov_base = (void *) ev;
iov.iov_len = sizeof(*ev);
len = io_send(uhid->io, &iov, 1);
if (len < 0)
return -errno;
/* uHID kernel driver does not handle partial writes */
return len != sizeof(*ev) ? -EIO : 0;
}
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