Linux Audio
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Embedded Linux Audio
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/* 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 0x01 #define AUDIO_APBRIDGEA_TYPE_REGISTER_CPORT 0x02 #define AUDIO_APBRIDGEA_TYPE_UNREGISTER_CPORT 0x03 #define AUDIO_APBRIDGEA_TYPE_SET_TX_DATA_SIZE 0x04 /* 0x05 unused */ #define AUDIO_APBRIDGEA_TYPE_PREPARE_TX 0x06 #define AUDIO_APBRIDGEA_TYPE_START_TX 0x07 #define AUDIO_APBRIDGEA_TYPE_STOP_TX 0x08 #define AUDIO_APBRIDGEA_TYPE_SHUTDOWN_TX 0x09 #define AUDIO_APBRIDGEA_TYPE_SET_RX_DATA_SIZE 0x0a /* 0x0b unused */ #define AUDIO_APBRIDGEA_TYPE_PREPARE_RX 0x0c #define AUDIO_APBRIDGEA_TYPE_START_RX 0x0d #define AUDIO_APBRIDGEA_TYPE_STOP_RX 0x0e #define AUDIO_APBRIDGEA_TYPE_SHUTDOWN_RX 0x0f #define AUDIO_APBRIDGEA_PCM_FMT_8 BIT(0) #define AUDIO_APBRIDGEA_PCM_FMT_16 BIT(1) #define AUDIO_APBRIDGEA_PCM_FMT_24 BIT(2) #define AUDIO_APBRIDGEA_PCM_FMT_32 BIT(3) #define AUDIO_APBRIDGEA_PCM_FMT_64 BIT(4) #define AUDIO_APBRIDGEA_PCM_RATE_5512 BIT(0) #define AUDIO_APBRIDGEA_PCM_RATE_8000 BIT(1) #define AUDIO_APBRIDGEA_PCM_RATE_11025 BIT(2) #define AUDIO_APBRIDGEA_PCM_RATE_16000 BIT(3) #define AUDIO_APBRIDGEA_PCM_RATE_22050 BIT(4) #define AUDIO_APBRIDGEA_PCM_RATE_32000 BIT(5) #define AUDIO_APBRIDGEA_PCM_RATE_44100 BIT(6) #define AUDIO_APBRIDGEA_PCM_RATE_48000 BIT(7) #define AUDIO_APBRIDGEA_PCM_RATE_64000 BIT(8) #define AUDIO_APBRIDGEA_PCM_RATE_88200 BIT(9) #define AUDIO_APBRIDGEA_PCM_RATE_96000 BIT(10) #define AUDIO_APBRIDGEA_PCM_RATE_176400 BIT(11) #define AUDIO_APBRIDGEA_PCM_RATE_192000 BIT(12) #define AUDIO_APBRIDGEA_DIRECTION_TX BIT(0) #define AUDIO_APBRIDGEA_DIRECTION_RX BIT(1) /* 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 { __u8 type; __le16 i2s_port; __u8 data[0]; } __packed; struct audio_apbridgea_set_config_request { struct audio_apbridgea_hdr hdr; __le32 format; /* AUDIO_APBRIDGEA_PCM_FMT_* */ __le32 rate; /* AUDIO_APBRIDGEA_PCM_RATE_* */ __le32 mclk_freq; /* XXX Remove? */ } __packed; struct audio_apbridgea_register_cport_request { struct audio_apbridgea_hdr hdr; __le16 cport; __u8 direction; } __packed; struct audio_apbridgea_unregister_cport_request { struct audio_apbridgea_hdr hdr; __le16 cport; __u8 direction; } __packed; struct audio_apbridgea_set_tx_data_size_request { struct audio_apbridgea_hdr hdr; __le16 size; } __packed; struct audio_apbridgea_prepare_tx_request { struct audio_apbridgea_hdr hdr; } __packed; struct audio_apbridgea_start_tx_request { struct audio_apbridgea_hdr hdr; __le64 timestamp; } __packed; struct audio_apbridgea_stop_tx_request { struct audio_apbridgea_hdr hdr; } __packed; struct audio_apbridgea_shutdown_tx_request { struct audio_apbridgea_hdr hdr; } __packed; struct audio_apbridgea_set_rx_data_size_request { struct audio_apbridgea_hdr hdr; __le16 size; } __packed; struct audio_apbridgea_prepare_rx_request { struct audio_apbridgea_hdr hdr; } __packed; struct audio_apbridgea_start_rx_request { struct audio_apbridgea_hdr hdr; } __packed; struct audio_apbridgea_stop_rx_request { struct audio_apbridgea_hdr hdr; } __packed; struct audio_apbridgea_shutdown_rx_request { struct audio_apbridgea_hdr hdr; } __packed; #endif /*__AUDIO_APBRIDGEA_H */
