/* * Texas Instruments' Bluetooth HCILL UART protocol * * HCILL (HCI Low Level) is a Texas Instruments' power management * protocol extension to H4. * * Copyright (C) 2007 Texas Instruments, Inc. * * Written by Ohad Ben-Cohen * * Acknowledgements: * This file is based on hci_h4.c, which was written * by Maxim Krasnyansky and Marcel Holtmann. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "hci_uart.h" /* HCILL commands */ #define HCILL_GO_TO_SLEEP_IND 0x30 #define HCILL_GO_TO_SLEEP_ACK 0x31 #define HCILL_WAKE_UP_IND 0x32 #define HCILL_WAKE_UP_ACK 0x33 /* HCILL receiver States */ #define HCILL_W4_PACKET_TYPE 0 #define HCILL_W4_EVENT_HDR 1 #define HCILL_W4_ACL_HDR 2 #define HCILL_W4_SCO_HDR 3 #define HCILL_W4_DATA 4 /* HCILL states */ enum hcill_states_e { HCILL_ASLEEP, HCILL_ASLEEP_TO_AWAKE, HCILL_AWAKE, HCILL_AWAKE_TO_ASLEEP }; struct hcill_cmd { u8 cmd; } __packed; struct ll_struct { unsigned long rx_state; unsigned long rx_count; struct sk_buff *rx_skb; struct sk_buff_head txq; spinlock_t hcill_lock; /* HCILL state lock */ unsigned long hcill_state; /* HCILL power state */ struct sk_buff_head tx_wait_q; /* HCILL wait queue */ }; /* * Builds and sends an HCILL command packet. * These are very simple packets with only 1 cmd byte */ static int send_hcill_cmd(u8 cmd, struct hci_uart *hu) { int err = 0; struct sk_buff *skb = NULL; struct ll_struct *ll = hu->priv; struct hcill_cmd *hcill_packet; BT_DBG("hu %p cmd 0x%x", hu, cmd); /* allocate packet */ skb = bt_skb_alloc(1, GFP_ATOMIC); if (!skb) { BT_ERR("cannot allocate memory for HCILL packet"); err = -ENOMEM; goto out; } /* prepare packet */ hcill_packet = (struct hcill_cmd *) skb_put(skb, 1); hcill_packet->cmd = cmd; skb->dev = (void *) hu->hdev; /* send packet */ skb_queue_tail(&ll->txq, skb); out: return err; } /* Initialize protocol */ static int ll_open(struct hci_uart *hu) { struct ll_struct *ll; BT_DBG("hu %p", hu); ll = kzalloc(sizeof(*ll), GFP_KERNEL); if (!ll) return -ENOMEM; skb_queue_head_init(&ll->txq); skb_queue_head_init(&ll->tx_wait_q); spin_lock_init(&ll->hcill_lock); ll->hcill_state = HCILL_AWAKE; hu->priv = ll; return 0; } /* Flush protocol data */ static int ll_flush(struct hci_uart *hu) { struct ll_struct *ll = hu->priv; BT_DBG("hu %p", hu); skb_queue_purge(&ll->tx_wait_q); skb_queue_purge(&ll->txq); return 0; } /* Close protocol */ static int ll_close(struct hci_uart *hu) { struct ll_struct *ll = hu->priv; BT_DBG("hu %p", hu); skb_queue_purge(&ll->tx_wait_q); skb_queue_purge(&ll->txq); kfree_skb(ll->rx_skb); hu->priv = NULL; kfree(ll); return 0; } /* * internal function, which does common work of the device wake up process: * 1. places all pending packets (waiting in tx_wait_q list) in txq list. * 2. changes internal state to HCILL_AWAKE. * Note: assumes that hcill_lock spinlock is taken, * shouldn't be called otherwise! */ static void __ll_do_awake(struct ll_struct *ll) { struct sk_buff *skb = NULL; while ((skb = skb_dequeue(&ll->tx_wait_q))) skb_queue_tail(&ll->txq, skb); ll->hcill_state = HCILL_AWAKE; } /* * Called upon a wake-up-indication from the device */ static void ll_device_want_to_wakeup(struct hci_uart *hu) { unsigned long flags; struct ll_struct *ll = hu->priv; BT_DBG("hu %p", hu); /* lock hcill state */ spin_lock_irqsave(&ll->hcill_lock, flags); switch (ll->hcill_state) { case HCILL_ASLEEP_TO_AWAKE: /* * This state means that both the host and the BRF chip * have simultaneously sent a wake-up-indication packet. * Traditionally, in this case, receiving a wake-up-indication * was enough and an additional wake-up-ack wasn't needed. * This has changed with the BRF6350, which does require an * explicit wake-up-ack. Other BRF versions, which do not * require an explicit ack here, do accept it, thus it is * perfectly safe to always send one. */ BT_DBG("dual wake-up-indication"); /* deliberate fall-through - do not add break */ case HCILL_ASLEEP: /* acknowledge device wake up */ if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) { BT_ERR("cannot acknowledge device wake up"); goto out; } break; default: /* any other state is illegal */ BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state); break; } /* send pending packets and change state to HCILL_AWAKE */ __ll_do_awake(ll); out: spin_unlock_irqrestore(&ll->hcill_lock, flags); /* actually send the packets */ hci_uart_tx_wakeup(hu); } /* * Called upon a sleep-indication from the device */ static void ll_device_want_to_sleep(struct hci_uart *hu) { unsigned long flags; struct ll_struct *ll = hu->priv; BT_DBG("hu %p", hu); /* lock hcill state */ spin_lock_irqsave(&ll->hcill_lock, flags); /* sanity check */ if (ll->hcill_state != HCILL_AWAKE) BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state); /* acknowledge device sleep */ if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) { BT_ERR("cannot acknowledge device sleep"); goto out; } /* update state */ ll->hcill_state = HCILL_ASLEEP; out: spin_unlock_irqrestore(&ll->hcill_lock, flags); /* actually send the sleep ack packet */ hci_uart_tx_wakeup(hu); } /* * Called upon wake-up-acknowledgement from the device */ static void ll_device_woke_up(struct hci_uart *hu) { unsigned long flags; struct ll_struct *ll = hu->priv; BT_DBG("hu %p", hu); /* lock hcill state */ spin_lock_irqsave(&ll->hcill_lock, flags); /* sanity check */ if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE) BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state); /* send pendi
/*
 * MIT License
 *
 * Copyright (c) 2021 Joey Castillo
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

//-----------------------------------------------------------------------------
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <stdio.h>
#include "saml22.h"
#include "hal_init.h"
#include "pins.h"
#include "watch.h"
#include "tusb.h"

int main(void) {
    // ASF code. Initialize the MCU with configuration options from Atmel Studio.
    init_mcu();

    // check if we are plugged into USB power.
    watch_enable_digital_input(VBUS_DET);
    watch_enable_pull_down(VBUS_DET);
    if (watch_get_pin_level(VBUS_DET)) {
        // if so, enable USB functionality.
        _watch_enable_usb();
    }
    watch_disable_digital_input(VBUS_DET);

    // initialize the delay driver before any user code is called.
    delay_driver_init();

    // User code. Give the app a chance to initialize its data structures and state.
    app_init();

    // If the RTC is already enabled, we're either waking from BACKUP mode or a reset.
    // Ideally we should check if the TAMPER or CMP0 (alarm) flags are set.
    if (_watch_rtc_is_enabled()) {
        // User code. Give the application a chance to restore state from backup registers.
        app_wake_from_backup();

        // disable the tamper interrupt and clear the tamper bit
        hri_rtcmode0_clear_INTEN_TAMPER_bit(RTC);
        hri_rtcmode0_clear_interrupt_TAMPER_bit(RTC);
    }

    // Watch library code. Set initial parameters for the device and enable the RTC.
    _watch_init();

    // User code. Give the app a chance to enable and set up peripherals.
    app_setup();

    while (1) {
        bool usb_enabled = hri_usbdevice_get_CTRLA_ENABLE_bit(USB);
        bool can_sleep = app_loop();

        if (can_sleep && !usb_enabled) {
            app_prepare_for_standby();
            sleep(4);
            app_wake_from_standby();
        }
    }

    return 0;
}
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