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  * @private_data: pointer to DSP private data
61  */
62 struct snd_compr_stream {
63 	const char *name;
64 	struct snd_compr_ops *ops;
65 	struct snd_compr_runtime *runtime;
66 	struct snd_compr *device;
67 	struct delayed_work error_work;
68 	enum snd_compr_direction direction;
69 	bool metadata_set;
70 	bool next_track;
71 	void *private_data;
72 };
73 
74 /**
75  * struct snd_compr_ops: compressed path DSP operations
76  * @open: Open the compressed stream
77  * This callback is mandatory and shall keep dsp ready to receive the stream
78  * parameter
79  * @free: Close the compressed stream, mandatory
80  * @set_params: Sets the compressed stream parameters, mandatory
81  * This can be called in during stream creation only to set codec params
82  * and the stream properties
83  * @get_params: retrieve the codec parameters, mandatory
84  * @set_metadata: Set the metadata values for a stream
85  * @get_metadata: retrieves the requested metadata values from stream
86  * @trigger: Trigger operations like start, pause, resume, drain, stop.
87  * This callback is mandatory
88  * @pointer: Retrieve current h/w pointer information. Mandatory
89  * @copy: Copy the compressed data to/from userspace, Optional
90  * Can't be implemented if DSP supports mmap
91  * @mmap: DSP mmap method to mmap DSP memory
92  * @ack: Ack for DSP when data is written to audio buffer, Optional
93  * Not valid if copy is implemented
94  * @get_caps: Retrieve DSP capabilities, mandatory
95  * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory
96  */
97 struct snd_compr_ops {
98 	int (*open)(struct snd_compr_stream *stream);
99 	int (*free)(struct snd_compr_stream *stream);
100 	int (*set_params)(struct snd_compr_stream *stream,
101 			struct snd_compr_params *params);
102 	int (*get_params)(struct snd_compr_stream *stream,
103 			struct snd_codec *params);
104 	int (*set_metadata)(struct snd_compr_stream *stream,
105 			struct snd_compr_metadata *metadata);
106 	int (*get_metadata)(struct snd_compr_stream *stream,
107 			struct snd_compr_metadata *metadata);
108 	int (*trigger)(struct snd_compr_stream *stream, int cmd);
109 	int (*pointer)(struct snd_compr_stream *stream,
110 			struct snd_compr_tstamp *tstamp);
111 	int (*copy)(struct snd_compr_stream *stream, char __user *buf,
112 		       size_t count);
113 	int (*mmap)(struct snd_compr_stream *stream,
114 			struct vm_area_struct *vma);
115 	int (*ack)(struct snd_compr_stream *stream, size_t bytes);
116 	int (*get_caps) (struct snd_compr_stream *stream,
117 			struct snd_compr_caps *caps);
118 	int (*get_codec_caps) (struct snd_compr_stream *stream,
119 			struct snd_compr_codec_caps *codec);
120 };
121 
122 /**
123  * struct snd_compr: Compressed device
124  * @name: DSP device name
125  * @dev: associated device instance
126  * @ops: pointer to DSP callbacks
127  * @private_data: pointer to DSP pvt data
128  * @card: sound card pointer
129  * @direction: Playback or capture direction
130  * @lock: device lock
131  * @device: device id
132  */
133 struct snd_compr {
134 	const char *name;
135 	struct device dev;
136 	struct snd_compr_ops *ops;
137 	void *private_data;
138 	struct snd_card *card;
139 	unsigned int direction;
140 	struct mutex lock;
141 	int device;
142 #ifdef CONFIG_SND_VERBOSE_PROCFS
143 	/* private: */
144 	char id[64];
145 	struct snd_info_entry *proc_root;
146 	struct snd_info_entry *proc_info_entry;
147 #endif
148 };
149 
150 /* compress device register APIs */
151 int snd_compress_register(struct snd_compr *device);
152 int snd_compress_deregister(struct snd_compr *device);
153 int snd_compress_new(struct snd_card *card, int device,
154 			int type, const char *id, struct snd_compr *compr);
155 
156 /* dsp driver callback apis
157  * For playback: driver should call snd_compress_fragment_elapsed() to let the
158  * framework know that a fragment has been consumed from the ring buffer
159  *
160  * For recording: we want to know when a frame is available or when
161  * at least one frame is available so snd_compress_frame_elapsed()
162  * callback should be called when a encodeded frame is available
163  */
164 static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
165 {
166 	wake_up(&stream->runtime->sleep);
167 }
168 
169 static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
170 {
171 	if (snd_BUG_ON(!stream))
172 		return;
173 
174 	stream->runtime->state = SNDRV_PCM_STATE_SETUP;
175 	wake_up(&stream->runtime->sleep);
176 }
177 
178 int snd_compr_stop_error(struct snd_compr_stream *stream,
179 			 snd_pcm_state_t state);
180 
181 #endif
182