/* SPDX-License-Identifier: BSD-3-Clause */ /* * Copyright (c) 2015-2016 Google Inc. */ /* * This is a special protocol for configuring communication over the * I2S bus between the DSP on the MSM8994 and APBridgeA. Therefore, * we can predefine several low-level attributes of the communication * because we know that they are supported. In particular, the following * assumptions are made: * - there are two channels (i.e., stereo) * - the low-level protocol is I2S as defined by Philips/NXP * - the DSP on the MSM8994 is the clock master for MCLK, BCLK, and WCLK * - WCLK changes on the falling edge of BCLK * - WCLK low for left channel; high for right channel * - TX data is sent on the falling edge of BCLK * - RX data is received/latched on the rising edge of BCLK */ #ifndef __AUDIO_APBRIDGEA_H #define __AUDIO_APBRIDGEA_H #define AUDIO_APBRIDGEA_TYPE_SET_CONFIG … #define AUDIO_APBRIDGEA_TYPE_REGISTER_CPORT … #define AUDIO_APBRIDGEA_TYPE_UNREGISTER_CPORT … #define AUDIO_APBRIDGEA_TYPE_SET_TX_DATA_SIZE … /* 0x05 unused */ #define AUDIO_APBRIDGEA_TYPE_PREPARE_TX … #define AUDIO_APBRIDGEA_TYPE_START_TX … #define AUDIO_APBRIDGEA_TYPE_STOP_TX … #define AUDIO_APBRIDGEA_TYPE_SHUTDOWN_TX … #define AUDIO_APBRIDGEA_TYPE_SET_RX_DATA_SIZE … /* 0x0b unused */ #define AUDIO_APBRIDGEA_TYPE_PREPARE_RX … #define AUDIO_APBRIDGEA_TYPE_START_RX … #define AUDIO_APBRIDGEA_TYPE_STOP_RX … #define AUDIO_APBRIDGEA_TYPE_SHUTDOWN_RX … #define AUDIO_APBRIDGEA_PCM_FMT_8 … #define AUDIO_APBRIDGEA_PCM_FMT_16 … #define AUDIO_APBRIDGEA_PCM_FMT_24 … #define AUDIO_APBRIDGEA_PCM_FMT_32 … #define AUDIO_APBRIDGEA_PCM_FMT_64 … #define AUDIO_APBRIDGEA_PCM_RATE_5512 … #define AUDIO_APBRIDGEA_PCM_RATE_8000 … #define AUDIO_APBRIDGEA_PCM_RATE_11025 … #define AUDIO_APBRIDGEA_PCM_RATE_16000 … #define AUDIO_APBRIDGEA_PCM_RATE_22050 … #define AUDIO_APBRIDGEA_PCM_RATE_32000 … #define AUDIO_APBRIDGEA_PCM_RATE_44100 … #define AUDIO_APBRIDGEA_PCM_RATE_48000 … #define AUDIO_APBRIDGEA_PCM_RATE_64000 … #define AUDIO_APBRIDGEA_PCM_RATE_88200 … #define AUDIO_APBRIDGEA_PCM_RATE_96000 … #define AUDIO_APBRIDGEA_PCM_RATE_176400 … #define AUDIO_APBRIDGEA_PCM_RATE_192000 … #define AUDIO_APBRIDGEA_DIRECTION_TX … #define AUDIO_APBRIDGEA_DIRECTION_RX … /* The I2S port is passed in the 'index' parameter of the USB request */ /* The CPort is passed in the 'value' parameter of the USB request */ struct audio_apbridgea_hdr { … } __packed; struct audio_apbridgea_set_config_request { … } __packed; struct audio_apbridgea_register_cport_request { … } __packed; struct audio_apbridgea_unregister_cport_request { … } __packed; struct audio_apbridgea_set_tx_data_size_request { … } __packed; struct audio_apbridgea_prepare_tx_request { … } __packed; struct audio_apbridgea_start_tx_request { … } __packed; struct audio_apbridgea_stop_tx_request { … } __packed; struct audio_apbridgea_shutdown_tx_request { … } __packed; struct audio_apbridgea_set_rx_data_size_request { … } __packed; struct audio_apbridgea_prepare_rx_request { … } __packed; struct audio_apbridgea_start_rx_request { … } __packed; struct audio_apbridgea_stop_rx_request { … } __packed; struct audio_apbridgea_shutdown_rx_request { … } __packed; #endif /*__AUDIO_APBRIDGEA_H */
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