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audio_apbridgea.h
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audio_apbridgea.h
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/**
* Copyright (c) 2015-2016 Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* 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 */