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feat(ble): Support perhipheral battery levels.
* Add ability to fetch and report peripheral battery levels on split centrals. * Add additional support for adding a new Battery Level service to split centrals that exposes fetched peripheral battery levels to connected hosts. Co-authored-by: Peter Johanson <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| /* | ||
| * Copyright (c) 2020 The ZMK Contributors | ||
| * | ||
| * SPDX-License-Identifier: MIT | ||
| */ | ||
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| #include <zephyr/device.h> | ||
| #include <zephyr/init.h> | ||
| #include <sys/types.h> | ||
| #include <zephyr/kernel.h> | ||
| #include <zephyr/drivers/sensor.h> | ||
| #include <zephyr/bluetooth/gatt.h> | ||
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| #include <zephyr/logging/log.h> | ||
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| LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL); | ||
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| #include <zmk/event_manager.h> | ||
| #include <zmk/battery.h> | ||
| #include <zmk/events/battery_state_changed.h> | ||
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| // Initialize the charge level to a special value indicating no sampling has been made yet. | ||
| static uint8_t last_state_of_peripheral_charge[CONFIG_ZMK_SPLIT_BLE_CENTRAL_PERIPHERALS] = {0}; | ||
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| static void blvl_ccc_cfg_changed(const struct bt_gatt_attr *attr, uint16_t value) { | ||
| ARG_UNUSED(attr); | ||
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| bool notif_enabled = (value == BT_GATT_CCC_NOTIFY); | ||
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| LOG_INF("BAS Notifications %s", notif_enabled ? "enabled" : "disabled"); | ||
| } | ||
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| static ssize_t read_blvl(struct bt_conn *conn, const struct bt_gatt_attr *attr, void *buf, | ||
| uint16_t len, uint16_t offset) { | ||
| const char *lvl8 = attr->user_data; | ||
| return bt_gatt_attr_read(conn, attr, buf, len, offset, lvl8, sizeof(uint8_t)); | ||
| } | ||
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| static const struct bt_gatt_cpf aux_level_cpf = { | ||
| .format = 0x04, // uint8 | ||
| .exponent = 0x0, | ||
| .unit = 0x27AD, // Percentage | ||
| .name_space = 0x01, // Bluetooth SIG | ||
| .description = 0x0108, // "auxiliary" | ||
| }; | ||
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| #define PERIPH_CUD_(x) "Peripheral " #x | ||
| #define PERIPH_CUD(x) PERIPH_CUD_(x) | ||
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| #define PERIPH_BATT_LEVEL_ATTRS(i, _) \ | ||
| BT_GATT_CHARACTERISTIC(BT_UUID_BAS_BATTERY_LEVEL, BT_GATT_CHRC_READ | BT_GATT_CHRC_NOTIFY, \ | ||
| BT_GATT_PERM_READ, read_blvl, NULL, \ | ||
| &last_state_of_peripheral_charge[i]), \ | ||
| BT_GATT_CCC(blvl_ccc_cfg_changed, BT_GATT_PERM_READ | BT_GATT_PERM_WRITE), \ | ||
| BT_GATT_CPF(&aux_level_cpf), BT_GATT_CUD(PERIPH_CUD(i), BT_GATT_PERM_READ), | ||
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| BT_GATT_SERVICE_DEFINE(bas_aux, BT_GATT_PRIMARY_SERVICE(BT_UUID_BAS), | ||
| LISTIFY(CONFIG_ZMK_SPLIT_BLE_CENTRAL_PERIPHERALS, PERIPH_BATT_LEVEL_ATTRS, | ||
| ())); | ||
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| int peripheral_batt_lvl_listener(const zmk_event_t *eh) { | ||
| const struct zmk_peripheral_battery_state_changed *ev = | ||
| as_zmk_peripheral_battery_state_changed(eh); | ||
| if (ev == NULL) { | ||
| return ZMK_EV_EVENT_BUBBLE; | ||
| }; | ||
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| if (ev->source >= CONFIG_ZMK_SPLIT_BLE_CENTRAL_PERIPHERALS) { | ||
| LOG_WRN("Got battery level event for an out of range peripheral index"); | ||
| return ZMK_EV_EVENT_BUBBLE; | ||
| } | ||
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| LOG_DBG("Peripheral battery level event: %u", ev->state_of_charge); | ||
| last_state_of_peripheral_charge[ev->source] = ev->state_of_charge; | ||
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| // 1 offsets for the service attribute, then offset 5 for each battery because that's how | ||
| // many attributes are added per battery | ||
| uint8_t index = 1 + (5 * ev->source); | ||
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| int rc = bt_gatt_notify(NULL, &bas_aux.attrs[index], &last_state_of_peripheral_charge, | ||
| sizeof(last_state_of_peripheral_charge)); | ||
| if (rc < 0 && rc != -ENOTCONN) { | ||
| LOG_WRN("Failed to notify hosts of peripheral battery level: %d", rc); | ||
| } | ||
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| return ZMK_EV_EVENT_BUBBLE; | ||
| }; | ||
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| ZMK_LISTENER(peripheral_batt_lvl_listener, peripheral_batt_lvl_listener); | ||
| ZMK_SUBSCRIPTION(peripheral_batt_lvl_listener, zmk_peripheral_battery_state_changed); |
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