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1 | #ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED |
2 | #define SOUND_FIREWIRE_AMDTP_H_INCLUDED |
3 | |
4 | #include <linux/mutex.h> |
5 | #include <linux/spinlock.h> |
6 | #include "packets-buffer.h" |
7 | |
8 | /** |
9 | * enum cip_out_flags - describes details of the streaming protocol |
10 | * @CIP_NONBLOCKING: In non-blocking mode, each packet contains |
11 | * sample_rate/8000 samples, with rounding up or down to adjust |
12 | * for clock skew and left-over fractional samples. This should |
13 | * be used if supported by the device. |
14 | */ |
15 | enum cip_out_flags { |
16 | CIP_NONBLOCKING = 0, |
17 | }; |
18 | |
19 | /** |
20 | * enum cip_sfc - a stream's sample rate |
21 | */ |
22 | enum cip_sfc { |
23 | CIP_SFC_32000 = 0, |
24 | CIP_SFC_44100 = 1, |
25 | CIP_SFC_48000 = 2, |
26 | CIP_SFC_88200 = 3, |
27 | CIP_SFC_96000 = 4, |
28 | CIP_SFC_176400 = 5, |
29 | CIP_SFC_192000 = 6, |
30 | }; |
31 | |
32 | #define AMDTP_OUT_PCM_FORMAT_BITS (SNDRV_PCM_FMTBIT_S16 | \ |
33 | SNDRV_PCM_FMTBIT_S32) |
34 | |
35 | struct fw_unit; |
36 | struct fw_iso_context; |
37 | struct snd_pcm_substream; |
38 | |
39 | struct amdtp_out_stream { |
40 | struct fw_unit *unit; |
41 | enum cip_out_flags flags; |
42 | struct fw_iso_context *context; |
43 | struct mutex mutex; |
44 | |
45 | enum cip_sfc sfc; |
46 | unsigned int data_block_quadlets; |
47 | unsigned int pcm_channels; |
48 | unsigned int midi_ports; |
49 | void (*transfer_samples)(struct amdtp_out_stream *s, |
50 | struct snd_pcm_substream *pcm, |
51 | __be32 *buffer, unsigned int frames); |
52 | |
53 | unsigned int syt_interval; |
54 | unsigned int source_node_id_field; |
55 | struct iso_packets_buffer buffer; |
56 | |
57 | struct snd_pcm_substream *pcm; |
58 | |
59 | int packet_index; |
60 | unsigned int data_block_counter; |
61 | |
62 | unsigned int data_block_state; |
63 | |
64 | unsigned int last_syt_offset; |
65 | unsigned int syt_offset_state; |
66 | |
67 | unsigned int pcm_buffer_pointer; |
68 | unsigned int pcm_period_pointer; |
69 | }; |
70 | |
71 | int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit, |
72 | enum cip_out_flags flags); |
73 | void amdtp_out_stream_destroy(struct amdtp_out_stream *s); |
74 | |
75 | void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate); |
76 | unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s); |
77 | |
78 | int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed); |
79 | void amdtp_out_stream_update(struct amdtp_out_stream *s); |
80 | void amdtp_out_stream_stop(struct amdtp_out_stream *s); |
81 | |
82 | void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s, |
83 | snd_pcm_format_t format); |
84 | void amdtp_out_stream_pcm_abort(struct amdtp_out_stream *s); |
85 | |
86 | /** |
87 | * amdtp_out_stream_set_pcm - configure format of PCM samples |
88 | * @s: the AMDTP output stream to be configured |
89 | * @pcm_channels: the number of PCM samples in each data block, to be encoded |
90 | * as AM824 multi-bit linear audio |
91 | * |
92 | * This function must not be called while the stream is running. |
93 | */ |
94 | static inline void amdtp_out_stream_set_pcm(struct amdtp_out_stream *s, |
95 | unsigned int pcm_channels) |
96 | { |
97 | s->pcm_channels = pcm_channels; |
98 | } |
99 | |
100 | /** |
101 | * amdtp_out_stream_set_midi - configure format of MIDI data |
102 | * @s: the AMDTP output stream to be configured |
103 | * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels) |
104 | * |
105 | * This function must not be called while the stream is running. |
106 | */ |
107 | static inline void amdtp_out_stream_set_midi(struct amdtp_out_stream *s, |
108 | unsigned int midi_ports) |
109 | { |
110 | s->midi_ports = midi_ports; |
111 | } |
112 | |
113 | /** |
114 | * amdtp_out_streaming_error - check for streaming error |
115 | * @s: the AMDTP output stream |
116 | * |
117 | * If this function returns true, the stream's packet queue has stopped due to |
118 | * an asynchronous error. |
119 | */ |
120 | static inline bool amdtp_out_streaming_error(struct amdtp_out_stream *s) |
121 | { |
122 | return s->packet_index < 0; |
123 | } |
124 | |
125 | /** |
126 | * amdtp_out_stream_pcm_prepare - prepare PCM device for running |
127 | * @s: the AMDTP output stream |
128 | * |
129 | * This function should be called from the PCM device's .prepare callback. |
130 | */ |
131 | static inline void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s) |
132 | { |
133 | s->pcm_buffer_pointer = 0; |
134 | s->pcm_period_pointer = 0; |
135 | } |
136 | |
137 | /** |
138 | * amdtp_out_stream_pcm_trigger - start/stop playback from a PCM device |
139 | * @s: the AMDTP output stream |
140 | * @pcm: the PCM device to be started, or %NULL to stop the current device |
141 | * |
142 | * Call this function on a running isochronous stream to enable the actual |
143 | * transmission of PCM data. This function should be called from the PCM |
144 | * device's .trigger callback. |
145 | */ |
146 | static inline void amdtp_out_stream_pcm_trigger(struct amdtp_out_stream *s, |
147 | struct snd_pcm_substream *pcm) |
148 | { |
149 | ACCESS_ONCE(s->pcm) = pcm; |
150 | } |
151 | |
152 | /** |
153 | * amdtp_out_stream_pcm_pointer - get the PCM buffer position |
154 | * @s: the AMDTP output stream that transports the PCM data |
155 | * |
156 | * Returns the current buffer position, in frames. |
157 | */ |
158 | static inline unsigned long |
159 | amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s) |
160 | { |
161 | return ACCESS_ONCE(s->pcm_buffer_pointer); |
162 | } |
163 | |
164 | static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc) |
165 | { |
166 | return sfc & 1; |
167 | } |
168 | |
169 | #endif |
170 |
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