1 /* SPDX-License-Identifier: GPL-2.0
2 *
3 * compress_driver.h - compress offload driver definations
4 *
5 * Copyright (C) 2011 Intel Corporation
6 * Authors: Vinod Koul <vinod.koul@linux.intel.com>
7 * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
8 */
9
10 #ifndef __COMPRESS_DRIVER_H
11 #define __COMPRESS_DRIVER_H
12
13 #include <linux/types.h>
14 #include <linux/sched.h>
15 #include <sound/core.h>
16 #include <sound/compress_offload.h>
17 #include <sound/asound.h>
18 #include <sound/pcm.h>
19
20 struct snd_compr_ops;
21
22 /**
23 * struct snd_compr_runtime: runtime stream description
24 * @state: stream state
25 * @ops: pointer to DSP callbacks
26 * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
27 * DSP doesn't implement copy
28 * @buffer_size: size of the above buffer
29 * @fragment_size: size of buffer fragment in bytes
30 * @fragments: number of such fragments
31 * @total_bytes_available: cumulative number of bytes made available in
32 * the ring buffer
33 * @total_bytes_transferred: cumulative bytes transferred by offload DSP
34 * @sleep: poll sleep
35 * @private_data: driver private data pointer
36 */
37 struct snd_compr_runtime {
38 snd_pcm_state_t state;
39 struct snd_compr_ops *ops;
40 void *buffer;
41 u64 buffer_size;
42 u32 fragment_size;
43 u32 fragments;
44 u64 total_bytes_available;
45 u64 total_bytes_transferred;
46 wait_queue_head_t sleep;
47 void *private_data;
48 };
49
50 /**
51 * struct snd_compr_stream: compressed stream
52 * @name: device name
53 * @ops: pointer to DSP callbacks
54 * @runtime: pointer to runtime structure
55 * @device: device pointer
56 * @error_work: delayed work used when closing the stream due to an error
57 * @direction: stream direction, playback/recording
58 * @metadata_set: metadata set flag, true when set
59 * @next_track: has userspace signal next track transition, true when set
60 * @partial_drain: undergoing partial_drain for stream, true when set
61 * @private_data: pointer to DSP private data
62 */
63 struct snd_compr_stream {
64 const char *name;
65 struct snd_compr_ops *ops;
66 struct snd_compr_runtime *runtime;
67 struct snd_compr *device;
68 struct delayed_work error_work;
69 enum snd_compr_direction direction;
70 bool metadata_set;
71 bool next_track;
72 bool partial_drain;
73 void *private_data;
74 };
75
76 /**
77 * struct snd_compr_ops: compressed path DSP operations
78 * @open: Open the compressed stream
79 * This callback is mandatory and shall keep dsp ready to receive the stream
80 * parameter
81 * @free: Close the compressed stream, mandatory
82 * @set_params: Sets the compressed stream parameters, mandatory
83 * This can be called in during stream creation only to set codec params
84 * and the stream properties
85 * @get_params: retrieve the codec parameters, mandatory
86 * @set_metadata: Set the metadata values for a stream
87 * @get_metadata: retrieves the requested metadata values from stream
88 * @trigger: Trigger operations like start, pause, resume, drain, stop.
89 * This callback is mandatory
90 * @pointer: Retrieve current h/w pointer information. Mandatory
91 * @copy: Copy the compressed data to/from userspace, Optional
92 * Can't be implemented if DSP supports mmap
93 * @mmap: DSP mmap method to mmap DSP memory
94 * @ack: Ack for DSP when data is written to audio buffer, Optional
95 * Not valid if copy is implemented
96 * @get_caps: Retrieve DSP capabilities, mandatory
97 * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory
98 */
99 struct snd_compr_ops {
100 int (*open)(struct snd_compr_stream *stream);
101 int (*free)(struct snd_compr_stream *stream);
102 int (*set_params)(struct snd_compr_stream *stream,
103 struct snd_compr_params *params);
104 int (*get_params)(struct snd_compr_stream *stream,
105 struct snd_codec *params);
106 int (*set_metadata)(struct snd_compr_stream *stream,
107 struct snd_compr_metadata *metadata);
108 int (*get_metadata)(struct snd_compr_stream *stream,
109 struct snd_compr_metadata *metadata);
110 int (*trigger)(struct snd_compr_stream *stream, int cmd);
111 int (*pointer)(struct snd_compr_stream *stream,
112 struct snd_compr_tstamp *tstamp);
113 int (*copy)(struct snd_compr_stream *stream, char __user *buf,
114 size_t count);
115 int (*mmap)(struct snd_compr_stream *stream,
116 struct vm_area_struct *vma);
117 int (*ack)(struct snd_compr_stream *stream, size_t bytes);
118 int (*get_caps) (struct snd_compr_stream *stream,
119 struct snd_compr_caps *caps);
120 int (*get_codec_caps) (struct snd_compr_stream *stream,
121 struct snd_compr_codec_caps *codec);
122 };
123
124 /**
125 * struct snd_compr: Compressed device
126 * @name: DSP device name
127 * @dev: associated device instance
128 * @ops: pointer to DSP callbacks
129 * @private_data: pointer to DSP pvt data
130 * @card: sound card pointer
131 * @direction: Playback or capture direction
132 * @lock: device lock
133 * @device: device id
134 */
135 struct snd_compr {
136 const char *name;
137 struct device dev;
138 struct snd_compr_ops *ops;
139 void *private_data;
140 struct snd_card *card;
141 unsigned int direction;
142 struct mutex lock;
143 int device;
144 #ifdef CONFIG_SND_VERBOSE_PROCFS
145 /* private: */
146 char id[64];
147 struct snd_info_entry *proc_root;
148 struct snd_info_entry *proc_info_entry;
149 #endif
150 };
151
152 /* compress device register APIs */
153 int snd_compress_register(struct snd_compr *device);
154 int snd_compress_deregister(struct snd_compr *device);
155 int snd_compress_new(struct snd_card *card, int device,
156 int type, const char *id, struct snd_compr *compr);
157
158 /* dsp driver callback apis
159 * For playback: driver should call snd_compress_fragment_elapsed() to let the
160 * framework know that a fragment has been consumed from the ring buffer
161 *
162 * For recording: we want to know when a frame is available or when
163 * at least one frame is available so snd_compress_frame_elapsed()
164 * callback should be called when a encodeded frame is available
165 */
snd_compr_fragment_elapsed(struct snd_compr_stream * stream)166 static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
167 {
168 wake_up(&stream->runtime->sleep);
169 }
170
snd_compr_drain_notify(struct snd_compr_stream * stream)171 static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
172 {
173 if (snd_BUG_ON(!stream))
174 return;
175
176 /* for partial_drain case we are back to running state on success */
177 if (stream->partial_drain) {
178 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
179 stream->partial_drain = false; /* clear this flag as well */
180 } else {
181 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
182 }
183
184 wake_up(&stream->runtime->sleep);
185 }
186
187 int snd_compr_stop_error(struct snd_compr_stream *stream,
188 snd_pcm_state_t state);
189
190 #endif
191