44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
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/*
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* Copyright (c) 2022 Intel Corporation
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* Copyright (c) 2023 SILA Embedded Solutions GmbH
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "smbus_utils.h"
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(smbus_utils, CONFIG_SMBUS_LOG_LEVEL);
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void smbus_loop_alert_devices(const struct device *dev, sys_slist_t *callbacks)
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{
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int result;
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uint8_t address;
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/**
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* There might be several peripheral devices which could have triggered the alert and
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* the one with the highest priority (lowest address) device wins the arbitration. In
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* any case, we will have to loop through all of them.
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*
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* The format of the transaction is:
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*
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* 0 1 2
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |S| Alert Addr |R|A| Address |X|N|P|
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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while (true) {
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result = smbus_byte_read(dev, SMBUS_ADDRESS_ARA, &address);
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if (result != 0) {
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LOG_DBG("%s: no more peripheral devices left which triggered an alert",
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dev->name);
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return;
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}
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LOG_DBG("%s: address 0x%02X triggered an alert", dev->name, address);
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smbus_fire_callbacks(callbacks, dev, address);
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}
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}
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