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amdtp.h
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1 #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
2 #define SOUND_FIREWIRE_AMDTP_H_INCLUDED
3 
4 #include <linux/interrupt.h>
5 #include <linux/mutex.h>
6 #include <linux/spinlock.h>
7 #include "packets-buffer.h"
8 
16 enum cip_out_flags {
17  CIP_NONBLOCKING = 0,
18 };
19 
23 enum cip_sfc {
24  CIP_SFC_32000 = 0,
25  CIP_SFC_44100 = 1,
26  CIP_SFC_48000 = 2,
27  CIP_SFC_88200 = 3,
28  CIP_SFC_96000 = 4,
29  CIP_SFC_176400 = 5,
30  CIP_SFC_192000 = 6,
31 };
32 
33 #define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \
34  SNDRV_PCM_FMTBIT_S32)
35 
36 struct fw_unit;
37 struct fw_iso_context;
38 struct snd_pcm_substream;
39 
40 struct amdtp_out_stream {
41  struct fw_unit *unit;
42  enum cip_out_flags flags;
43  struct fw_iso_context *context;
44  struct mutex mutex;
45 
46  enum cip_sfc sfc;
47  unsigned int data_block_quadlets;
48  unsigned int pcm_channels;
49  unsigned int midi_ports;
50  void (*transfer_samples)(struct amdtp_out_stream *s,
51  struct snd_pcm_substream *pcm,
52  __be32 *buffer, unsigned int frames);
53 
54  unsigned int syt_interval;
55  unsigned int source_node_id_field;
56  struct iso_packets_buffer buffer;
57 
58  struct snd_pcm_substream *pcm;
59  struct tasklet_struct period_tasklet;
60 
61  int packet_index;
62  unsigned int data_block_counter;
63 
64  unsigned int data_block_state;
65 
66  unsigned int last_syt_offset;
67  unsigned int syt_offset_state;
68 
69  unsigned int pcm_buffer_pointer;
70  unsigned int pcm_period_pointer;
71  bool pointer_flush;
72 };
73 
74 int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit,
75  enum cip_out_flags flags);
76 void amdtp_out_stream_destroy(struct amdtp_out_stream *s);
77 
78 void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate);
79 unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s);
80 
81 int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed);
82 void amdtp_out_stream_update(struct amdtp_out_stream *s);
83 void amdtp_out_stream_stop(struct amdtp_out_stream *s);
84 
85 void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
86  snd_pcm_format_t format);
87 void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s);
88 unsigned long amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s);
89 void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s);
90 
99 static inline void amdtp_out_stream_set_pcm(struct amdtp_out_stream *s,
100  unsigned int pcm_channels)
101 {
102  s->pcm_channels = pcm_channels;
103 }
104 
112 static inline void amdtp_out_stream_set_midi(struct amdtp_out_stream *s,
113  unsigned int midi_ports)
114 {
115  s->midi_ports = midi_ports;
116 }
117 
125 static inline bool amdtp_out_streaming_error(struct amdtp_out_stream *s)
126 {
127  return s->packet_index < 0;
128 }
129 
139 static inline void amdtp_out_stream_pcm_trigger(struct amdtp_out_stream *s,
140  struct snd_pcm_substream *pcm)
141 {
142  ACCESS_ONCE(s->pcm) = pcm;
143 }
144 
145 static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
146 {
147  return sfc & 1;
148 }
149 
150 #endif
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