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  * @dma_area: virtual buffer address
37  * @dma_addr: physical buffer address (not accessible from main CPU)
38  * @dma_bytes: size of DMA area
39  * @dma_buffer_p: runtime dma buffer pointer
40  */
41 struct snd_compr_runtime {
42 	snd_pcm_state_t state;
43 	struct snd_compr_ops *ops;
44 	void *buffer;
45 	u64 buffer_size;
46 	u32 fragment_size;
47 	u32 fragments;
48 	u64 total_bytes_available;
49 	u64 total_bytes_transferred;
50 	wait_queue_head_t sleep;
51 	void *private_data;
52 
53 	unsigned char *dma_area;
54 	dma_addr_t dma_addr;
55 	size_t dma_bytes;
56 	struct snd_dma_buffer *dma_buffer_p;
57 };
58 
59 /**
60  * struct snd_compr_stream: compressed stream
61  * @name: device name
62  * @ops: pointer to DSP callbacks
63  * @runtime: pointer to runtime structure
64  * @device: device pointer
65  * @error_work: delayed work used when closing the stream due to an error
66  * @direction: stream direction, playback/recording
67  * @metadata_set: metadata set flag, true when set
68  * @next_track: has userspace signal next track transition, true when set
69  * @partial_drain: undergoing partial_drain for stream, true when set
70  * @pause_in_draining: paused during draining state, true when set
71  * @private_data: pointer to DSP private data
72  * @dma_buffer: allocated buffer if any
73  */
74 struct snd_compr_stream {
75 	const char *name;
76 	struct snd_compr_ops *ops;
77 	struct snd_compr_runtime *runtime;
78 	struct snd_compr *device;
79 	struct delayed_work error_work;
80 	enum snd_compr_direction direction;
81 	bool metadata_set;
82 	bool next_track;
83 	bool partial_drain;
84 	bool pause_in_draining;
85 	void *private_data;
86 	struct snd_dma_buffer dma_buffer;
87 };
88 
89 /**
90  * struct snd_compr_ops: compressed path DSP operations
91  * @open: Open the compressed stream
92  * This callback is mandatory and shall keep dsp ready to receive the stream
93  * parameter
94  * @free: Close the compressed stream, mandatory
95  * @set_params: Sets the compressed stream parameters, mandatory
96  * This can be called in during stream creation only to set codec params
97  * and the stream properties
98  * @get_params: retrieve the codec parameters, mandatory
99  * @set_metadata: Set the metadata values for a stream
100  * @get_metadata: retrieves the requested metadata values from stream
101  * @trigger: Trigger operations like start, pause, resume, drain, stop.
102  * This callback is mandatory
103  * @pointer: Retrieve current h/w pointer information. Mandatory
104  * @copy: Copy the compressed data to/from userspace, Optional
105  * Can't be implemented if DSP supports mmap
106  * @mmap: DSP mmap method to mmap DSP memory
107  * @ack: Ack for DSP when data is written to audio buffer, Optional
108  * Not valid if copy is implemented
109  * @get_caps: Retrieve DSP capabilities, mandatory
110  * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory
111  */
112 struct snd_compr_ops {
113 	int (*open)(struct snd_compr_stream *stream);
114 	int (*free)(struct snd_compr_stream *stream);
115 	int (*set_params)(struct snd_compr_stream *stream,
116 			struct snd_compr_params *params);
117 	int (*get_params)(struct snd_compr_stream *stream,
118 			struct snd_codec *params);
119 	int (*set_metadata)(struct snd_compr_stream *stream,
120 			struct snd_compr_metadata *metadata);
121 	int (*get_metadata)(struct snd_compr_stream *stream,
122 			struct snd_compr_metadata *metadata);
123 	int (*trigger)(struct snd_compr_stream *stream, int cmd);
124 	int (*pointer)(struct snd_compr_stream *stream,
125 			struct snd_compr_tstamp *tstamp);
126 	int (*copy)(struct snd_compr_stream *stream, char __user *buf,
127 		       size_t count);
128 	int (*mmap)(struct snd_compr_stream *stream,
129 			struct vm_area_struct *vma);
130 	int (*ack)(struct snd_compr_stream *stream, size_t bytes);
131 	int (*get_caps) (struct snd_compr_stream *stream,
132 			struct snd_compr_caps *caps);
133 	int (*get_codec_caps) (struct snd_compr_stream *stream,
134 			struct snd_compr_codec_caps *codec);
135 };
136 
137 /**
138  * struct snd_compr: Compressed device
139  * @name: DSP device name
140  * @dev: associated device instance
141  * @ops: pointer to DSP callbacks
142  * @private_data: pointer to DSP pvt data
143  * @card: sound card pointer
144  * @direction: Playback or capture direction
145  * @lock: device lock
146  * @device: device id
147  * @use_pause_in_draining: allow pause in draining, true when set
148  */
149 struct snd_compr {
150 	const char *name;
151 	struct device dev;
152 	struct snd_compr_ops *ops;
153 	void *private_data;
154 	struct snd_card *card;
155 	unsigned int direction;
156 	struct mutex lock;
157 	int device;
158 	bool use_pause_in_draining;
159 #ifdef CONFIG_SND_VERBOSE_PROCFS
160 	/* private: */
161 	char id[64];
162 	struct snd_info_entry *proc_root;
163 	struct snd_info_entry *proc_info_entry;
164 #endif
165 };
166 
167 /* compress device register APIs */
168 int snd_compress_new(struct snd_card *card, int device,
169 			int type, const char *id, struct snd_compr *compr);
170 
171 /**
172  * snd_compr_use_pause_in_draining - Allow pause and resume in draining state
173  * @substream: compress substream to set
174  *
175  * Allow pause and resume in draining state.
176  * Only HW driver supports this transition can call this API.
177  */
178 static inline void snd_compr_use_pause_in_draining(struct snd_compr_stream *substream)
179 {
180 	substream->device->use_pause_in_draining = true;
181 }
182 
183 /* dsp driver callback apis
184  * For playback: driver should call snd_compress_fragment_elapsed() to let the
185  * framework know that a fragment has been consumed from the ring buffer
186  *
187  * For recording: we want to know when a frame is available or when
188  * at least one frame is available so snd_compress_frame_elapsed()
189  * callback should be called when a encodeded frame is available
190  */
191 static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
192 {
193 	wake_up(&stream->runtime->sleep);
194 }
195 
196 static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
197 {
198 	if (snd_BUG_ON(!stream))
199 		return;
200 
201 	/* for partial_drain case we are back to running state on success */
202 	if (stream->partial_drain) {
203 		stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
204 		stream->partial_drain = false; /* clear this flag as well */
205 	} else {
206 		stream->runtime->state = SNDRV_PCM_STATE_SETUP;
207 	}
208 
209 	wake_up(&stream->runtime->sleep);
210 }
211 
212 /**
213  * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
214  * @stream: compress stream to set
215  * @bufp: the buffer information, NULL to clear
216  *
217  * Copy the buffer information to runtime buffer when @bufp is non-NULL.
218  * Otherwise it clears the current buffer information.
219  */
220 static inline void
221 snd_compr_set_runtime_buffer(struct snd_compr_stream *stream,
222 			     struct snd_dma_buffer *bufp)
223 {
224 	struct snd_compr_runtime *runtime = stream->runtime;
225 
226 	if (bufp) {
227 		runtime->dma_buffer_p = bufp;
228 		runtime->dma_area = bufp->area;
229 		runtime->dma_addr = bufp->addr;
230 		runtime->dma_bytes = bufp->bytes;
231 	} else {
232 		runtime->dma_buffer_p = NULL;
233 		runtime->dma_area = NULL;
234 		runtime->dma_addr = 0;
235 		runtime->dma_bytes = 0;
236 	}
237 }
238 
239 int snd_compr_malloc_pages(struct snd_compr_stream *stream, size_t size);
240 int snd_compr_free_pages(struct snd_compr_stream *stream);
241 
242 int snd_compr_stop_error(struct snd_compr_stream *stream,
243 			 snd_pcm_state_t state);
244 
245 #endif
246