/**************************************************************************** * include/nuttx/audio/wm8994.h * * 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 __INCLUDE_NUTTX_AUDIO_WM8994_H #define __INCLUDE_NUTTX_AUDIO_WM8994_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #ifdef CONFIG_AUDIO_WM8994 /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Configuration ************************************************************ * * CONFIG_AUDIO_WM8994 - Enables WM8994 support * CONFIG_WM8994_INITVOLUME - The initial volume level in the range {0..1000} * CONFIG_WM8994_INFLIGHT - Maximum number of buffers that the WM8994 driver * will send to the I2S driver before any have completed. * CONFIG_WM8994_MSG_PRIO - Priority of messages sent to the WM8994 worker * thread. * CONFIG_WM8994_BUFFER_SIZE - Preferred buffer size * CONFIG_WM8994_NUM_BUFFERS - Preferred number of buffers * CONFIG_WM8994_WORKER_STACKSIZE - Stack size to use when creating the * WM8994 worker thread. * CONFIG_WM8994_REGDUMP - Enable logic to dump all WM8994 registers to * the SYSLOG device. */ /* Pre-requisites */ #ifndef CONFIG_AUDIO # error CONFIG_AUDIO is required for audio subsystem support #endif #ifndef CONFIG_I2S # error CONFIG_I2S is required by the WM8994 driver #endif #ifndef CONFIG_I2C # error CONFIG_I2C is required by the WM8994 driver #endif #ifndef CONFIG_SCHED_WORKQUEUE # error CONFIG_SCHED_WORKQUEUE is required by the WM8994 driver #endif /* Default configuration values */ #ifndef CONFIG_WM8994_INITVOLUME # define CONFIG_WM8994_INITVOLUME 250 #endif #ifndef CONFIG_WM8994_INFLIGHT # define CONFIG_WM8994_INFLIGHT 2 #endif #if CONFIG_WM8994_INFLIGHT > 255 # error CONFIG_WM8994_INFLIGHT must fit in a uint8_t #endif #ifndef CONFIG_WM8994_MSG_PRIO # define CONFIG_WM8994_MSG_PRIO 1 #endif #ifndef CONFIG_WM8994_BUFFER_SIZE # define CONFIG_WM8994_BUFFER_SIZE 8192 #endif #ifndef CONFIG_WM8994_NUM_BUFFERS # define CONFIG_WM8994_NUM_BUFFERS 4 #endif #ifndef CONFIG_WM8994_WORKER_STACKSIZE # define CONFIG_WM8994_WORKER_STACKSIZE 768 #endif /* Helper macros ************************************************************/ #define WM8994_ATTACH(s,isr,arg) ((s)->attach(s,isr,arg)) #define WM8994_DETACH(s) ((s)->attach(s,NULL,NULL)) #define WM8994_ENABLE(s) ((s)->enable(s,true)) #define WM8994_DISABLE(s) ((s)->enable(s,false)) #define WM8994_RESTORE(s,e) ((s)->enable(s,e)) /**************************************************************************** * Public Types ****************************************************************************/ /* This is the type of the WM8994 interrupt handler. The lower level code * will intercept the interrupt and provide the upper level with the private * data that was provided when the interrupt was attached. */ struct wm8994_lower_s; /* Forward reference. Defined below */ typedef CODE int (*wm8994_handler_t)(FAR const struct wm8994_lower_s *lower, FAR void *arg); /* A reference to a structure of this type must be passed to the WM8994 * driver. This structure provides information about the configuration * of the WM8994 and provides some board-specific hooks. * * Memory for this structure is provided by the caller. It is not copied * by the driver and is presumed to persist while the driver is active. */ struct wm8994_lower_s { /* I2C characterization */ uint32_t frequency; /* Initial I2C frequency */ uint8_t address; /* 7-bit I2C address (only bits 0-6 used) */ /* Clocking is provided via MCLK. The WM8994 driver will need to know * the frequency of MCLK in order to generate the correct bitrates. */ uint32_t mclk; /* W8994 Master clock frequency */ /* IRQ/GPIO access callbacks. These operations all hidden behind * callbacks to isolate the WM8994 driver from differences in GPIO * interrupt handling by varying boards and MCUs. If possible, * interrupts should be configured on both rising and falling edges * so that contact and loss-of-contact events can be detected. * * attach - Attach or detach the WM8994 interrupt handler to the GPIO * interrupt * enable - Enable or disable the GPIO interrupt. Returns the * previous interrupt state. */ CODE int (*attach)(FAR const struct wm8994_lower_s *lower, wm8994_handler_t isr, FAR void *arg); CODE bool (*enable)(FAR const struct wm8994_lower_s *lower, bool enable); }; /**************************************************************************** * Public Data ****************************************************************************/ #ifdef __cplusplus #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ /**************************************************************************** * Name: wm8994_initialize * * Description: * Initialize the WM8994 device. * * Input Parameters: * i2c - An I2C driver instance * i2s - An I2S driver instance * lower - Persistent board configuration data * * Returned Value: * A new lower half audio interface for the WM8994 device is returned on * success; NULL is returned on failure. * ****************************************************************************/ struct i2c_master_s; /* Forward reference. Defined in include/nuttx/i2c/i2c_master.h */ struct i2s_dev_s; /* Forward reference. Defined in include/nuttx/audio/i2s.h */ struct audio_lowerhalf_s; /* Forward reference. Defined in nuttx/audio/audio.h */ FAR struct audio_lowerhalf_s * wm8994_initialize(FAR struct i2c_master_s *i2c, FAR struct i2s_dev_s *i2s, FAR const struct wm8994_lower_s *lower); /**************************************************************************** * Name: wm8994_dump_registers * * Description: * Dump the contents of all WM8994 registers to the syslog device * * Input Parameters: * dev - The device instance returned by wm8994_initialize * * Returned Value: * None. * ****************************************************************************/ #ifdef CONFIG_WM8994_REGDUMP void wm8994_dump_registers(FAR struct audio_lowerhalf_s *dev, FAR const char *msg); #else /* This eliminates the need for any conditional compilation in the * including file. */ # define wm8994_dump_registers(d,m) #endif /**************************************************************************** * Name: wm8994_clock_analysis * * Description: * Analyze the settings in the clock chain and dump to syslog. * * Input Parameters: * dev - The device instance returned by wm8994_initialize * * Returned Value: * None. * ****************************************************************************/ #ifdef CONFIG_WM8994_CLKDEBUG void wm8994_clock_analysis(FAR struct audio_lowerhalf_s *dev, FAR const char *msg); #else /* This eliminates the need for any conditional compilation in the * including file. */ # define wm8994_clock_analysis(d,m) #endif #undef EXTERN #ifdef __cplusplus } #endif #endif /* CONFIG_AUDIO_WM8994 */ #endif /* __INCLUDE_NUTTX_AUDIO_WM8994_H */