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zmk/app/src/ble.c

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/*
* Copyright (c) 2020 The ZMK Contributors
*
* SPDX-License-Identifier: MIT
*/
#include <device.h>
#include <init.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <settings/settings.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/conn.h>
#include <bluetooth/hci.h>
#include <bluetooth/uuid.h>
#include <bluetooth/gatt.h>
#include <bluetooth/hci_err.h>
#if IS_ENABLED(CONFIG_SETTINGS)
#include <settings/settings.h>
#endif
#include <logging/log.h>
LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
#include <zmk/ble.h>
#include <zmk/keys.h>
#include <zmk/split/bluetooth/uuid.h>
#include <zmk/event-manager.h>
#include <zmk/events/ble-active-profile-changed.h>
static struct bt_conn *auth_passkey_entry_conn;
static u8_t passkey_entries[6] = {0, 0, 0, 0, 0, 0};
static u8_t passkey_digit = 0;
#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
#define PROFILE_COUNT (CONFIG_BT_MAX_PAIRED - 1)
#else
#define PROFILE_COUNT CONFIG_BT_MAX_PAIRED
#endif
static struct zmk_ble_profile profiles[PROFILE_COUNT];
static u8_t active_profile;
static const struct bt_data zmk_ble_ad[] = {
BT_DATA_BYTES(BT_DATA_FLAGS, (BT_LE_AD_GENERAL | BT_LE_AD_NO_BREDR)),
BT_DATA_BYTES(BT_DATA_UUID16_SOME,
#if !IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL)
0x12, 0x18, /* HID Service */
#endif
0x0f, 0x18 /* Battery Service */
),
#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL)
BT_DATA_BYTES(BT_DATA_UUID128_ALL,
ZMK_SPLIT_BT_SERVICE_UUID)
#endif
};
#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
static bt_addr_le_t peripheral_addr;
#endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL) */
static void raise_profile_changed_event()
{
struct ble_active_profile_changed *ev = new_ble_active_profile_changed();
ev->index = active_profile;
ev->profile = &profiles[active_profile];
ZMK_EVENT_RAISE(ev);
}
static bool active_profile_is_open()
{
return !bt_addr_le_cmp(&profiles[active_profile].peer, BT_ADDR_LE_ANY);
}
void set_profile_address(u8_t index, const bt_addr_le_t *addr)
{
char setting_name[15];
char addr_str[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(addr, addr_str, sizeof(addr_str));
memcpy(&profiles[index].peer, addr, sizeof(bt_addr_le_t));
sprintf(setting_name, "ble/profiles/%d", index);
LOG_DBG("Setting profile addr for %s to %s", log_strdup(setting_name), log_strdup(addr_str));
settings_save_one(setting_name, &profiles[index], sizeof(struct zmk_ble_profile));
raise_profile_changed_event();
}
int zmk_ble_adv_pause()
{
int err = bt_le_adv_stop();
if (err) {
LOG_ERR("Failed to stop advertising (err %d)", err);
return err;
}
return 0;
};
int zmk_ble_adv_resume()
{
LOG_DBG("active_profile %d, directed? %s", active_profile, active_profile_is_open() ? "no" : "yes");
int err = bt_le_adv_start(
BT_LE_ADV_CONN_NAME,
zmk_ble_ad, ARRAY_SIZE(zmk_ble_ad),
NULL, 0);
if (err)
{
LOG_ERR("Advertising failed to start (err %d)", err);
return err;
}
return 0;
};
int zmk_ble_clear_bonds()
{
LOG_DBG("");
if (bt_addr_le_cmp(&profiles[active_profile].peer, BT_ADDR_LE_ANY)) {
LOG_DBG("Unpairing!");
bt_unpair(BT_ID_DEFAULT, &profiles[active_profile].peer);
set_profile_address(active_profile, BT_ADDR_LE_ANY);
}
return 0;
};
int zmk_ble_prof_select(u8_t index)
{
LOG_DBG("profile %d", index);
if (active_profile == index) {
return 0;
}
active_profile = index;
return settings_save_one("ble/active_profile", &active_profile, sizeof(active_profile));
raise_profile_changed_event();
};
int zmk_ble_prof_next()
{
LOG_DBG("");
return zmk_ble_prof_select((active_profile + 1) % PROFILE_COUNT);
};
int zmk_ble_prof_prev()
{
LOG_DBG("");
return zmk_ble_prof_select((active_profile + PROFILE_COUNT - 1) % PROFILE_COUNT);
};
bt_addr_le_t *zmk_ble_active_profile_addr()
{
return &profiles[active_profile].peer;
}
char *zmk_ble_active_profile_name()
{
return profiles[active_profile].name;
}
#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
void zmk_ble_set_peripheral_addr(bt_addr_le_t *addr)
{
memcpy(&peripheral_addr, addr, sizeof(bt_addr_le_t));
settings_save_one("ble/peripheral_address", addr, sizeof(bt_addr_le_t));
}
#endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL) */
#if IS_ENABLED(CONFIG_SETTINGS)
static int ble_profiles_handle_set(const char *name, size_t len, settings_read_cb read_cb, void *cb_arg)
{
const char *next;
LOG_DBG("Setting BLE value %s", log_strdup(name));
if (settings_name_steq(name, "profiles", &next) && next) {
char *endptr;
u8_t idx = strtoul(next, &endptr, 10);
if (*endptr != '\0') {
LOG_WRN("Invalid profile index: %s", log_strdup(next));
return -EINVAL;
}
if (len != sizeof(struct zmk_ble_profile)) {
LOG_ERR("Invalid profile size (got %d expected %d)", len, sizeof(struct zmk_ble_profile));
return -EINVAL;
}
if (idx >= PROFILE_COUNT) {
LOG_WRN("Profile address for index %d is larger than max of %d", idx, PROFILE_COUNT);
return -EINVAL;
}
int err = read_cb(cb_arg, &profiles[idx], sizeof(struct zmk_ble_profile));
if (err <= 0) {
LOG_ERR("Failed to handle profile address from settings (err %d)", err);
return err;
}
char addr_str[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(&profiles[idx].peer, addr_str, sizeof(addr_str));
LOG_DBG("Loaded %s address for profile %d", log_strdup(addr_str), idx);
} else if (settings_name_steq(name, "active_profile", &next) && !next) {
if (len != sizeof(active_profile)) {
return -EINVAL;
}
int err = read_cb(cb_arg, &active_profile, sizeof(active_profile));
if (err <= 0) {
LOG_ERR("Failed to handle active profile from settings (err %d)", err);
return err;
}
}
#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
else if (settings_name_steq(name, "peripheral_address", &next) && !next) {
if (len != sizeof(bt_addr_le_t)) {
return -EINVAL;
}
int err = read_cb(cb_arg, &peripheral_addr, sizeof(bt_addr_le_t));
if (err <= 0) {
LOG_ERR("Failed to handle peripheral address from settings (err %d)", err);
return err;
}
}
#endif
return 0;
};
struct settings_handler profiles_handler = {
.name = "ble",
.h_set = ble_profiles_handle_set
};
#endif /* IS_ENABLED(CONFIG_SETTINGS) */
static void connected(struct bt_conn *conn, u8_t err)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
if (err)
{
LOG_WRN("Failed to connect to %s (%u)", log_strdup(addr), err);
return;
}
LOG_DBG("Connected %s", log_strdup(addr));
bt_conn_le_param_update(conn, BT_LE_CONN_PARAM(0x0006, 0x000c, 30, 400));
#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL)
bt_conn_le_phy_update(conn, BT_CONN_LE_PHY_PARAM_2M);
#endif
if (bt_conn_set_security(conn, BT_SECURITY_L2))
{
LOG_ERR("Failed to set security");
}
}
static void disconnected(struct bt_conn *conn, u8_t reason)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
LOG_DBG("Disconnected from %s (reason 0x%02x)", log_strdup(addr), reason);
#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
// if (bt_addr_le_cmp(&peripheral_addr, BT_ADDR_LE_ANY) && bt_addr_le_cmp(&peripheral_addr, bt_conn_get_dst(conn))) {
// zmk_ble_adv_resume();
// }
#else
// zmk_ble_adv_resume();
#endif
}
static void security_changed(struct bt_conn *conn, bt_security_t level,
enum bt_security_err err)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
if (!err)
{
LOG_DBG("Security changed: %s level %u", log_strdup(addr), level);
}
else
{
LOG_ERR("Security failed: %s level %u err %d", log_strdup(addr), level,
err);
}
}
static struct bt_conn_cb conn_callbacks = {
.connected = connected,
.disconnected = disconnected,
.security_changed = security_changed,
};
static void auth_passkey_display(struct bt_conn *conn, unsigned int passkey)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
LOG_DBG("Passkey for %s: %06u", log_strdup(addr), passkey);
}
#ifdef CONFIG_ZMK_BLE_PASSKEY_ENTRY
static void auth_passkey_entry(struct bt_conn *conn)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
LOG_DBG("Passkey entry requested for %s", log_strdup(addr));
auth_passkey_entry_conn = bt_conn_ref(conn);
}
#endif
static void auth_cancel(struct bt_conn *conn)
{
char addr[BT_ADDR_LE_STR_LEN];
bt_addr_le_to_str(bt_conn_get_dst(conn), addr, sizeof(addr));
if (auth_passkey_entry_conn)
{
bt_conn_unref(auth_passkey_entry_conn);
auth_passkey_entry_conn = NULL;
}
passkey_digit = 0;
LOG_DBG("Pairing cancelled: %s", log_strdup(addr));
}
#if !IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL)
static enum bt_security_err auth_pairing_accept(struct bt_conn *conn, const struct bt_conn_pairing_feat *const feat)
{
struct bt_conn_info info;
bt_conn_get_info(conn, &info);
LOG_DBG("role %d, open? %s", info.role, active_profile_is_open() ? "yes" : "no");
if (info.role != BT_CONN_ROLE_SLAVE && !active_profile_is_open()) {
LOG_WRN("Rejecting pairing request to taken profile %d", active_profile);
return BT_SECURITY_ERR_PAIR_NOT_ALLOWED;
}
return BT_SECURITY_ERR_SUCCESS;
};
#endif /* !IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL) */
static void auth_pairing_complete(struct bt_conn *conn, bool bonded)
{
struct bt_conn_info info;
char addr[BT_ADDR_LE_STR_LEN];
const bt_addr_le_t *dst = bt_conn_get_dst(conn);
bt_addr_le_to_str(dst, addr, sizeof(addr));
bt_conn_get_info(conn, &info);
if (info.role != BT_CONN_ROLE_SLAVE) {
LOG_DBG("SKIPPING FOR ROLE %d", info.role);
return;
}
#if !IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL)
if (!active_profile_is_open()) {
LOG_ERR("Pairing completed but current profile is not open: %s", log_strdup(addr));
bt_unpair(BT_ID_DEFAULT, dst);
return;
}
#endif /* !IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL) */
set_profile_address(active_profile, dst);
};
static struct bt_conn_auth_cb zmk_ble_auth_cb_display = {
#if !IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL)
.pairing_accept = auth_pairing_accept,
#endif /* !IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL) */
.pairing_complete = auth_pairing_complete,
// .passkey_display = auth_passkey_display,
#ifdef CONFIG_ZMK_BLE_PASSKEY_ENTRY
.passkey_entry = auth_passkey_entry,
#endif
.cancel = auth_cancel,
};
static void zmk_ble_ready(int err)
{
LOG_DBG("ready? %d", err);
if (err)
{
LOG_ERR("Bluetooth init failed (err %d)", err);
return;
}
zmk_ble_adv_resume();
}
static int zmk_ble_init(struct device *_arg)
{
int err = bt_enable(NULL);
if (err)
{
LOG_ERR("BLUETOOTH FAILED (%d)", err);
return err;
}
#if IS_ENABLED(CONFIG_SETTINGS)
settings_subsys_init();
err = settings_register(&profiles_handler);
if (err) {
LOG_ERR("Failed to setup the profile settings handler (err %d)", err);
return err;
}
settings_load();
#endif
#if IS_ENABLED(CONFIG_ZMK_BLE_CLEAR_BONDS_ON_START)
LOG_WRN("Clearing all existing BLE bond information from the keyboard");
for (int i = 0; i < 10; i++) {
bt_unpair(i, NULL);
}
for (int i = 0; i < PROFILE_COUNT; i++) {
char setting_name[15];
sprintf(setting_name, "ble/profiles/%d", i);
err = settings_delete(setting_name);
if (err) {
LOG_ERR("Failed to delete setting: %d", err);
}
}
#endif
bt_conn_cb_register(&conn_callbacks);
bt_conn_auth_cb_register(&zmk_ble_auth_cb_display);
zmk_ble_ready(0);
return 0;
}
int zmk_ble_unpair_all()
{
int resp = 0;
for (int i = BT_ID_DEFAULT; i < CONFIG_BT_ID_MAX; i++) {
int err = bt_unpair(BT_ID_DEFAULT, NULL);
if (err) {
resp = err;
LOG_ERR("Failed to unpair devices (err %d)", err);
}
}
return resp;
};
bool zmk_ble_handle_key_user(struct zmk_key_event *key_event)
{
zmk_key key = key_event->key;
if (!auth_passkey_entry_conn)
{
return true;
}
if (key < NUM_1 || key > NUM_0)
{
return true;
}
u32_t val = (key == NUM_0) ? 0 : (key - NUM_1 + 1);
passkey_entries[passkey_digit++] = val;
if (passkey_digit == 6)
{
u32_t passkey = 0;
for (int i = 5; i >= 0; i--)
{
passkey = (passkey * 10) + val;
}
bt_conn_auth_passkey_entry(auth_passkey_entry_conn, passkey);
bt_conn_unref(auth_passkey_entry_conn);
auth_passkey_entry_conn = NULL;
}
return false;
}
SYS_INIT(zmk_ble_init,
APPLICATION,
CONFIG_ZMK_BLE_INIT_PRIORITY);