root/drivers/staging/greybus/audio_apbridgea.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: BSD-3-Clause */
   2 /*
   3  * Copyright (c) 2015-2016 Google Inc.
   4  */
   5 /*
   6  * This is a special protocol for configuring communication over the
   7  * I2S bus between the DSP on the MSM8994 and APBridgeA.  Therefore,
   8  * we can predefine several low-level attributes of the communication
   9  * because we know that they are supported.  In particular, the following
  10  * assumptions are made:
  11  *      - there are two channels (i.e., stereo)
  12  *      - the low-level protocol is I2S as defined by Philips/NXP
  13  *      - the DSP on the MSM8994 is the clock master for MCLK, BCLK, and WCLK
  14  *      - WCLK changes on the falling edge of BCLK
  15  *      - WCLK low for left channel; high for right channel
  16  *      - TX data is sent on the falling edge of BCLK
  17  *      - RX data is received/latched on the rising edge of BCLK
  18  */
  19 
  20 #ifndef __AUDIO_APBRIDGEA_H
  21 #define __AUDIO_APBRIDGEA_H
  22 
  23 #define AUDIO_APBRIDGEA_TYPE_SET_CONFIG                 0x01
  24 #define AUDIO_APBRIDGEA_TYPE_REGISTER_CPORT             0x02
  25 #define AUDIO_APBRIDGEA_TYPE_UNREGISTER_CPORT           0x03
  26 #define AUDIO_APBRIDGEA_TYPE_SET_TX_DATA_SIZE           0x04
  27                                                         /* 0x05 unused */
  28 #define AUDIO_APBRIDGEA_TYPE_PREPARE_TX                 0x06
  29 #define AUDIO_APBRIDGEA_TYPE_START_TX                   0x07
  30 #define AUDIO_APBRIDGEA_TYPE_STOP_TX                    0x08
  31 #define AUDIO_APBRIDGEA_TYPE_SHUTDOWN_TX                0x09
  32 #define AUDIO_APBRIDGEA_TYPE_SET_RX_DATA_SIZE           0x0a
  33                                                         /* 0x0b unused */
  34 #define AUDIO_APBRIDGEA_TYPE_PREPARE_RX                 0x0c
  35 #define AUDIO_APBRIDGEA_TYPE_START_RX                   0x0d
  36 #define AUDIO_APBRIDGEA_TYPE_STOP_RX                    0x0e
  37 #define AUDIO_APBRIDGEA_TYPE_SHUTDOWN_RX                0x0f
  38 
  39 #define AUDIO_APBRIDGEA_PCM_FMT_8                       BIT(0)
  40 #define AUDIO_APBRIDGEA_PCM_FMT_16                      BIT(1)
  41 #define AUDIO_APBRIDGEA_PCM_FMT_24                      BIT(2)
  42 #define AUDIO_APBRIDGEA_PCM_FMT_32                      BIT(3)
  43 #define AUDIO_APBRIDGEA_PCM_FMT_64                      BIT(4)
  44 
  45 #define AUDIO_APBRIDGEA_PCM_RATE_5512                   BIT(0)
  46 #define AUDIO_APBRIDGEA_PCM_RATE_8000                   BIT(1)
  47 #define AUDIO_APBRIDGEA_PCM_RATE_11025                  BIT(2)
  48 #define AUDIO_APBRIDGEA_PCM_RATE_16000                  BIT(3)
  49 #define AUDIO_APBRIDGEA_PCM_RATE_22050                  BIT(4)
  50 #define AUDIO_APBRIDGEA_PCM_RATE_32000                  BIT(5)
  51 #define AUDIO_APBRIDGEA_PCM_RATE_44100                  BIT(6)
  52 #define AUDIO_APBRIDGEA_PCM_RATE_48000                  BIT(7)
  53 #define AUDIO_APBRIDGEA_PCM_RATE_64000                  BIT(8)
  54 #define AUDIO_APBRIDGEA_PCM_RATE_88200                  BIT(9)
  55 #define AUDIO_APBRIDGEA_PCM_RATE_96000                  BIT(10)
  56 #define AUDIO_APBRIDGEA_PCM_RATE_176400                 BIT(11)
  57 #define AUDIO_APBRIDGEA_PCM_RATE_192000                 BIT(12)
  58 
  59 #define AUDIO_APBRIDGEA_DIRECTION_TX                    BIT(0)
  60 #define AUDIO_APBRIDGEA_DIRECTION_RX                    BIT(1)
  61 
  62 /* The I2S port is passed in the 'index' parameter of the USB request */
  63 /* The CPort is passed in the 'value' parameter of the USB request */
  64 
  65 struct audio_apbridgea_hdr {
  66         __u8    type;
  67         __le16  i2s_port;
  68         __u8    data[0];
  69 } __packed;
  70 
  71 struct audio_apbridgea_set_config_request {
  72         struct audio_apbridgea_hdr      hdr;
  73         __le32                          format; /* AUDIO_APBRIDGEA_PCM_FMT_* */
  74         __le32                          rate;   /* AUDIO_APBRIDGEA_PCM_RATE_* */
  75         __le32                          mclk_freq; /* XXX Remove? */
  76 } __packed;
  77 
  78 struct audio_apbridgea_register_cport_request {
  79         struct audio_apbridgea_hdr      hdr;
  80         __le16                          cport;
  81         __u8                            direction;
  82 } __packed;
  83 
  84 struct audio_apbridgea_unregister_cport_request {
  85         struct audio_apbridgea_hdr      hdr;
  86         __le16                          cport;
  87         __u8                            direction;
  88 } __packed;
  89 
  90 struct audio_apbridgea_set_tx_data_size_request {
  91         struct audio_apbridgea_hdr      hdr;
  92         __le16                          size;
  93 } __packed;
  94 
  95 struct audio_apbridgea_prepare_tx_request {
  96         struct audio_apbridgea_hdr      hdr;
  97 } __packed;
  98 
  99 struct audio_apbridgea_start_tx_request {
 100         struct audio_apbridgea_hdr      hdr;
 101         __le64                          timestamp;
 102 } __packed;
 103 
 104 struct audio_apbridgea_stop_tx_request {
 105         struct audio_apbridgea_hdr      hdr;
 106 } __packed;
 107 
 108 struct audio_apbridgea_shutdown_tx_request {
 109         struct audio_apbridgea_hdr      hdr;
 110 } __packed;
 111 
 112 struct audio_apbridgea_set_rx_data_size_request {
 113         struct audio_apbridgea_hdr      hdr;
 114         __le16                          size;
 115 } __packed;
 116 
 117 struct audio_apbridgea_prepare_rx_request {
 118         struct audio_apbridgea_hdr      hdr;
 119 } __packed;
 120 
 121 struct audio_apbridgea_start_rx_request {
 122         struct audio_apbridgea_hdr      hdr;
 123 } __packed;
 124 
 125 struct audio_apbridgea_stop_rx_request {
 126         struct audio_apbridgea_hdr      hdr;
 127 } __packed;
 128 
 129 struct audio_apbridgea_shutdown_rx_request {
 130         struct audio_apbridgea_hdr      hdr;
 131 } __packed;
 132 
 133 #endif /*__AUDIO_APBRIDGEA_H */