| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #ifndef __LED_ITF_H__ |
| #define __LED_ITF_H__ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * LED interfaces |
| */ |
| #define LED_ITF_SPI (0) |
| #define LED_ITF_I2C (1) |
| #define LED_ITF_UART (2) |
| |
| /* |
| * LED interface |
| */ |
| struct led_itf { |
| |
| /* LED interface type */ |
| uint8_t li_type; |
| |
| /* interface number */ |
| uint8_t li_num; |
| |
| /* CS pin - optional, only needed for SPI */ |
| uint8_t li_cs_pin; |
| |
| /* LED chip address, only needed for I2C */ |
| uint16_t li_addr; |
| |
| /* Mutex for shared interface access */ |
| struct os_mutex *li_lock; |
| }; |
| |
| /** |
| * Lock access to the led_itf specified by li. Blocks until lock acquired. |
| * |
| * @param li The led_itf to lock |
| * @param timeout The timeout in milliseconds |
| * |
| * @return 0 on success, non-zero on failure. |
| */ |
| static inline int |
| led_itf_lock(struct led_itf *li, uint32_t timeout) |
| { |
| |
| int rc; |
| os_time_t ticks; |
| |
| if (!li->li_lock) { |
| return 0; |
| } |
| |
| rc = os_time_ms_to_ticks(timeout, &ticks); |
| if (rc) { |
| return rc; |
| } |
| |
| rc = os_mutex_pend(li->li_lock, ticks); |
| if (rc == 0 || rc == OS_NOT_STARTED) { |
| return (0); |
| } |
| |
| return (rc); |
| } |
| |
| /** |
| * Unlock access to the led_itf specified by li. |
| * |
| * @param li The led_itf to unlock access to |
| * |
| * @return 0 on success, non-zero on failure. |
| */ |
| static inline void |
| led_itf_unlock(struct led_itf *li) |
| { |
| if (!li->li_lock) { |
| return; |
| } |
| |
| os_mutex_release(li->li_lock); |
| } |
| |
| #endif |
