drivers/staging/greybus/audio.h

   1 /*
   2  * Greybus audio
   3  *
   4  * Copyright 2015 Google Inc.
   5  * Copyright 2015 Linaro Ltd.
   6  *
   7  * Released under the GPLv2 only.
   8  */
   9
  10 #ifndef __GB_AUDIO_H
  11 #define __GB_AUDIO_H
  12 #include <linux/kernel.h>
  13 #include <linux/device.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/module.h>
  16 #include <linux/i2c.h>
  17 #include <linux/platform_device.h>
  18 #include <sound/soc.h>
  19
  20 #include "greybus.h"
  21
  22 #define GB_SAMPLE_RATE                          48000
  23 #define GB_RATES                                SNDRV_PCM_RATE_48000
  24 #define GB_FMTS                                 SNDRV_PCM_FMTBIT_S16_LE
  25 #define PREALLOC_BUFFER                         (32 * 1024)
  26 #define PREALLOC_BUFFER_MAX                     (32 * 1024)
  27
  28 /* assuming 1 ms samples @ 48KHz */
  29 #define CONFIG_SAMPLES_PER_MSG                  48L
  30 #define CONFIG_PERIOD_NS                        1000000 /* send msg every 1ms */
  31
  32 #define CONFIG_COUNT_MAX                        20
  33
  34 /* Switch between dummy spdif and jetson rt5645 codec */
  35 #define USE_RT5645                              0
  36
  37 #define SAMPLE_SIZE                             4
  38 #define MAX_SEND_DATA_LEN (CONFIG_SAMPLES_PER_MSG * SAMPLE_SIZE)
  39 #define SEND_DATA_BUF_LEN (sizeof(struct gb_i2s_send_data_request) + \
  40                                 MAX_SEND_DATA_LEN)
  41
  42
  43 /*
  44  * This is the gb_snd structure which ties everything together
  45  * and fakes DMA interrupts via a timer.
  46  */
  47 struct gb_snd {
  48         struct platform_device          card;
  49         struct platform_device          cpu_dai;
  50         struct platform_device          *codec;
  51         struct asoc_simple_card_info    *simple_card_info;
  52         struct i2c_client               *rt5647;
  53         struct gb_connection            *mgmt_connection;
  54         struct gb_connection            *i2s_tx_connection;
  55         struct gb_connection            *i2s_rx_connection;
  56         struct gb_i2s_mgmt_get_supported_configurations_response
  57                                         *i2s_configs;
  58         char                            *send_data_req_buf;
  59         long                            send_data_sample_count;
  60         int                             gb_bundle_id;
  61         int                             device_count;
  62         struct snd_pcm_substream        *substream;
  63         struct hrtimer                  timer;
  64         atomic_t                        running;
  65         bool                            cport_active;
  66         struct workqueue_struct         *workqueue;
  67         struct work_struct              work;
  68         int                             hwptr_done;
  69         int                             transfer_done;
  70         struct list_head                list;
  71         spinlock_t                      lock;
  72 };
  73
  74
  75 /*
  76  * GB I2S cmd functions
  77  */
  78 int gb_i2s_mgmt_activate_cport(struct gb_connection *connection,
  79                                       uint16_t cport);
  80 int gb_i2s_mgmt_deactivate_cport(struct gb_connection *connection,
  81                                         uint16_t cport);
  82 int gb_i2s_mgmt_get_supported_configurations(
  83         struct gb_connection *connection,
  84         struct gb_i2s_mgmt_get_supported_configurations_response *get_cfg,
  85         size_t size);
  86 int gb_i2s_mgmt_set_configuration(struct gb_connection *connection,
  87                         struct gb_i2s_mgmt_set_configuration_request *set_cfg);
  88 int gb_i2s_mgmt_set_samples_per_message(struct gb_connection *connection,
  89                                         uint16_t samples_per_message);
  90 int gb_i2s_mgmt_get_cfgs(struct gb_snd *snd_dev,
  91                          struct gb_connection *connection);
  92 void gb_i2s_mgmt_free_cfgs(struct gb_snd *snd_dev);
  93 int gb_i2s_mgmt_set_cfg(struct gb_snd *snd_dev, int rate, int chans,
  94                         int bytes_per_chan, int is_le);
  95 int gb_i2s_send_data(struct gb_connection *connection, void *req_buf,
  96                                 void *source_addr, size_t len, int sample_num);
  97
  98
  99 /*
 100  * GB PCM hooks
 101  */
 102 void gb_pcm_hrtimer_start(struct gb_snd *snd_dev);
 103 void gb_pcm_hrtimer_stop(struct gb_snd *snd_dev);
 104
 105
 106 /*
 107  * Platform drivers
 108  */
 109 extern struct platform_driver gb_audio_pcm_driver;
 110 extern struct platform_driver gb_audio_plat_driver;
 111
 112
 113 #endif /* __GB_AUDIO_H */