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  * @dma_buffer_p: runtime dma buffer pointer
27  * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
28  *	DSP doesn't implement copy
29  * @buffer_size: size of the above buffer
30  * @fragment_size: size of buffer fragment in bytes
31  * @fragments: number of such fragments
32  * @total_bytes_available: cumulative number of bytes made available in
33  *	the ring buffer
34  * @total_bytes_transferred: cumulative bytes transferred by offload DSP
35  * @sleep: poll sleep
36  * @private_data: driver private data pointer
37  */
38 struct snd_compr_runtime {
39 	snd_pcm_state_t state;
40 	struct snd_compr_ops *ops;
41 	struct snd_dma_buffer *dma_buffer_p;
42 	void *buffer;
43 	u64 buffer_size;
44 	u32 fragment_size;
45 	u32 fragments;
46 	u64 total_bytes_available;
47 	u64 total_bytes_transferred;
48 	wait_queue_head_t sleep;
49 	void *private_data;
50 };
51 
52 /**
53  * struct snd_compr_stream: compressed stream
54  * @name: device name
55  * @ops: pointer to DSP callbacks
56  * @runtime: pointer to runtime structure
57  * @device: device pointer
58  * @error_work: delayed work used when closing the stream due to an error
59  * @direction: stream direction, playback/recording
60  * @metadata_set: metadata set flag, true when set
61  * @next_track: has userspace signal next track transition, true when set
62  * @private_data: pointer to DSP private data
63  */
64 struct snd_compr_stream {
65 	const char *name;
66 	struct snd_compr_ops *ops;
67 	struct snd_compr_runtime *runtime;
68 	struct snd_compr *device;
69 	struct delayed_work error_work;
70 	enum snd_compr_direction direction;
71 	bool metadata_set;
72 	bool next_track;
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  */
166 static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
167 {
168 	wake_up(&stream->runtime->sleep);
169 }
170 
171 static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
172 {
173 	if (snd_BUG_ON(!stream))
174 		return;
175 
176 	if (stream->direction == SND_COMPRESS_PLAYBACK)
177 		stream->runtime->state = SNDRV_PCM_STATE_SETUP;
178 	else
179 		stream->runtime->state = SNDRV_PCM_STATE_PREPARED;
180 
181 	wake_up(&stream->runtime->sleep);
182 }
183 
184 /**
185  * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
186  * @substream: compress substream to set
187  * @bufp: the buffer information, NULL to clear
188  *
189  * Copy the buffer information to runtime buffer when @bufp is non-NULL.
190  * Otherwise it clears the current buffer information.
191  */
192 static inline void snd_compr_set_runtime_buffer(
193 					struct snd_compr_stream *substream,
194 					struct snd_dma_buffer *bufp)
195 {
196 	struct snd_compr_runtime *runtime = substream->runtime;
197 
198 	runtime->dma_buffer_p = bufp;
199 }
200 
201 int snd_compr_stop_error(struct snd_compr_stream *stream,
202 			 snd_pcm_state_t state);
203 
204 #endif
205