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authorClemens Ladisch <clemens@ladisch.de>2011-03-15 02:53:21 -0400
committerTakashi Iwai <tiwai@suse.de>2011-03-15 03:42:22 -0400
commit31ef9134eb52636d383a7d0626cbbd345cb94f2f (patch)
tree5d994932a8773e844190cbea43ef31d67f605cf8 /sound/firewire/amdtp.h
parenta5abba989deceb731047425812d268daf7536575 (diff)
ALSA: add LaCie FireWire Speakers/Griffin FireWave Surround driver
Add a driver for two playback-only FireWire devices based on the OXFW970 chip. v2: better AMDTP API abstraction; fix fw_unit leak; small fixes v3: cache the iPCR value v4: FireWave constraints; fix fw_device reference counting; fix PCR caching; small changes and fixes v5: volume/mute support; fix crashing due to pcm stop races v6: fix build; one-channel volume for LaCie v7: use signed values to make volume (range checks) work; fix function block IDs for volume/mute; always use channel 0 for LaCie volume Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Tested-by: Jay Fenlason <fenlason@redhat.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/amdtp.h')
-rw-r--r--sound/firewire/amdtp.h157
1 files changed, 157 insertions, 0 deletions
diff --git a/sound/firewire/amdtp.h b/sound/firewire/amdtp.h
new file mode 100644
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+++ b/sound/firewire/amdtp.h
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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 */
15enum cip_out_flags {
16 CIP_NONBLOCKING = 0,
17};
18
19/**
20 * enum cip_sfc - a stream's sample rate
21 */
22enum 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
35struct fw_unit;
36struct fw_iso_context;
37struct snd_pcm_substream;
38
39struct 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 unsigned int packet_counter;
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
71int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit,
72 enum cip_out_flags flags);
73void amdtp_out_stream_destroy(struct amdtp_out_stream *s);
74
75void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate);
76unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s);
77
78int amdtp_out_stream_start(struct amdtp_out_stream *s, int channel, int speed);
79void amdtp_out_stream_update(struct amdtp_out_stream *s);
80void amdtp_out_stream_stop(struct amdtp_out_stream *s);
81
82void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s,
83 snd_pcm_format_t format);
84void 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 */
94static 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 */
107static 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_stream_pcm_prepare - prepare PCM device for running
115 * @s: the AMDTP output stream
116 *
117 * This function should be called from the PCM device's .prepare callback.
118 */
119static inline void amdtp_out_stream_pcm_prepare(struct amdtp_out_stream *s)
120{
121 s->pcm_buffer_pointer = 0;
122 s->pcm_period_pointer = 0;
123}
124
125/**
126 * amdtp_out_stream_pcm_trigger - start/stop playback from a PCM device
127 * @s: the AMDTP output stream
128 * @pcm: the PCM device to be started, or %NULL to stop the current device
129 *
130 * Call this function on a running isochronous stream to enable the actual
131 * transmission of PCM data. This function should be called from the PCM
132 * device's .trigger callback.
133 */
134static inline void amdtp_out_stream_pcm_trigger(struct amdtp_out_stream *s,
135 struct snd_pcm_substream *pcm)
136{
137 ACCESS_ONCE(s->pcm) = pcm;
138}
139
140/**
141 * amdtp_out_stream_pcm_pointer - get the PCM buffer position
142 * @s: the AMDTP output stream that transports the PCM data
143 *
144 * Returns the current buffer position, in frames.
145 */
146static inline unsigned long
147amdtp_out_stream_pcm_pointer(struct amdtp_out_stream *s)
148{
149 return ACCESS_ONCE(s->pcm_buffer_pointer);
150}
151
152static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
153{
154 return sfc & 1;
155}
156
157#endif