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43 lines
1.2 KiB
43 lines
1.2 KiB
/* |
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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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