// SPDX-License-Identifier: BSD-3-Clause
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/**
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* Copyright (c) 2015-2016 Google Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* This is a special protocol for configuring communication over the
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* I2S bus between the DSP on the MSM8994 and APBridgeA. Therefore,
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* we can predefine several low-level attributes of the communication
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* because we know that they are supported. In particular, the following
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* assumptions are made:
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* - there are two channels (i.e., stereo)
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* - the low-level protocol is I2S as defined by Philips/NXP
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* - the DSP on the MSM8994 is the clock master for MCLK, BCLK, and WCLK
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* - WCLK changes on the falling edge of BCLK
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* - WCLK low for left channel; high for right channel
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* - TX data is sent on the falling edge of BCLK
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* - RX data is received/latched on the rising edge of BCLK
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*/
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#ifndef __AUDIO_APBRIDGEA_H
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#define __AUDIO_APBRIDGEA_H
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#define AUDIO_APBRIDGEA_TYPE_SET_CONFIG 0x01
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#define AUDIO_APBRIDGEA_TYPE_REGISTER_CPORT 0x02
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#define AUDIO_APBRIDGEA_TYPE_UNREGISTER_CPORT 0x03
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#define AUDIO_APBRIDGEA_TYPE_SET_TX_DATA_SIZE 0x04
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/* 0x05 unused */
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#define AUDIO_APBRIDGEA_TYPE_PREPARE_TX 0x06
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#define AUDIO_APBRIDGEA_TYPE_START_TX 0x07
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#define AUDIO_APBRIDGEA_TYPE_STOP_TX 0x08
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#define AUDIO_APBRIDGEA_TYPE_SHUTDOWN_TX 0x09
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#define AUDIO_APBRIDGEA_TYPE_SET_RX_DATA_SIZE 0x0a
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/* 0x0b unused */
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#define AUDIO_APBRIDGEA_TYPE_PREPARE_RX 0x0c
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#define AUDIO_APBRIDGEA_TYPE_START_RX 0x0d
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#define AUDIO_APBRIDGEA_TYPE_STOP_RX 0x0e
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#define AUDIO_APBRIDGEA_TYPE_SHUTDOWN_RX 0x0f
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#define AUDIO_APBRIDGEA_PCM_FMT_8 BIT(0)
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#define AUDIO_APBRIDGEA_PCM_FMT_16 BIT(1)
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#define AUDIO_APBRIDGEA_PCM_FMT_24 BIT(2)
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#define AUDIO_APBRIDGEA_PCM_FMT_32 BIT(3)
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#define AUDIO_APBRIDGEA_PCM_FMT_64 BIT(4)
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#define AUDIO_APBRIDGEA_PCM_RATE_5512 BIT(0)
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#define AUDIO_APBRIDGEA_PCM_RATE_8000 BIT(1)
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#define AUDIO_APBRIDGEA_PCM_RATE_11025 BIT(2)
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#define AUDIO_APBRIDGEA_PCM_RATE_16000 BIT(3)
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#define AUDIO_APBRIDGEA_PCM_RATE_22050 BIT(4)
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#define AUDIO_APBRIDGEA_PCM_RATE_32000 BIT(5)
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#define AUDIO_APBRIDGEA_PCM_RATE_44100 BIT(6)
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#define AUDIO_APBRIDGEA_PCM_RATE_48000 BIT(7)
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#define AUDIO_APBRIDGEA_PCM_RATE_64000 BIT(8)
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#define AUDIO_APBRIDGEA_PCM_RATE_88200 BIT(9)
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#define AUDIO_APBRIDGEA_PCM_RATE_96000 BIT(10)
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#define AUDIO_APBRIDGEA_PCM_RATE_176400 BIT(11)
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#define AUDIO_APBRIDGEA_PCM_RATE_192000 BIT(12)
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#define AUDIO_APBRIDGEA_DIRECTION_TX BIT(0)
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#define AUDIO_APBRIDGEA_DIRECTION_RX BIT(1)
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/* The I2S port is passed in the 'index' parameter of the USB request */
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/* The CPort is passed in the 'value' parameter of the USB request */
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struct audio_apbridgea_hdr {
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__u8 type;
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__le16 i2s_port;
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__u8 data[0];
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} __packed;
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struct audio_apbridgea_set_config_request {
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struct audio_apbridgea_hdr hdr;
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__le32 format; /* AUDIO_APBRIDGEA_PCM_FMT_* */
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__le32 rate; /* AUDIO_APBRIDGEA_PCM_RATE_* */
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__le32 mclk_freq; /* XXX Remove? */
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} __packed;
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struct audio_apbridgea_register_cport_request {
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struct audio_apbridgea_hdr hdr;
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__le16 cport;
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__u8 direction;
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} __packed;
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struct audio_apbridgea_unregister_cport_request {
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struct audio_apbridgea_hdr hdr;
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__le16 cport;
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__u8 direction;
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} __packed;
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struct audio_apbridgea_set_tx_data_size_request {
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struct audio_apbridgea_hdr hdr;
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__le16 size;
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} __packed;
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struct audio_apbridgea_prepare_tx_request {
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struct audio_apbridgea_hdr hdr;
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} __packed;
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struct audio_apbridgea_start_tx_request {
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struct audio_apbridgea_hdr hdr;
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__le64 timestamp;
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} __packed;
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struct audio_apbridgea_stop_tx_request {
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struct audio_apbridgea_hdr hdr;
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} __packed;
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struct audio_apbridgea_shutdown_tx_request {
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struct audio_apbridgea_hdr hdr;
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} __packed;
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struct audio_apbridgea_set_rx_data_size_request {
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struct audio_apbridgea_hdr hdr;
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__le16 size;
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} __packed;
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struct audio_apbridgea_prepare_rx_request {
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struct audio_apbridgea_hdr hdr;
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} __packed;
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struct audio_apbridgea_start_rx_request {
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struct audio_apbridgea_hdr hdr;
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} __packed;
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struct audio_apbridgea_stop_rx_request {
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struct audio_apbridgea_hdr hdr;
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} __packed;
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struct audio_apbridgea_shutdown_rx_request {
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struct audio_apbridgea_hdr hdr;
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} __packed;
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#endif /*__AUDIO_APBRIDGEA_H */
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