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
20struct snd_compr_ops;
21
22/**
23 * struct snd_compr_task_runtime: task runtime description
24 * @list: list of all managed tasks
25 * @input: input DMA buffer
26 * @output: output DMA buffer
27 * @seqno: sequence number
28 * @input_size: really used data in the input buffer
29 * @output_size: really used data in the output buffer
30 * @flags: see SND_COMPRESS_TFLG_*
31 * @state: actual task state
32 * @private_value: used by the lowlevel driver (opaque)
33 */
34struct snd_compr_task_runtime {
35 struct list_head list;
36 struct dma_buf *input;
37 struct dma_buf *output;
38 u64 seqno;
39 u64 input_size;
40 u64 output_size;
41 u32 flags;
42 u8 state;
43 void *private_value;
44};
45
46/**
47 * struct snd_compr_runtime: runtime stream description
48 * @state: stream state
49 * @ops: pointer to DSP callbacks
50 * @buffer: pointer to kernel buffer, valid only when not in mmap mode or
51 * DSP doesn't implement copy
52 * @buffer_size: size of the above buffer
53 * @fragment_size: size of buffer fragment in bytes
54 * @fragments: number of such fragments
55 * @total_bytes_available: cumulative number of bytes made available in
56 * the ring buffer
57 * @total_bytes_transferred: cumulative bytes transferred by offload DSP
58 * @sleep: poll sleep
59 * @private_data: driver private data pointer
60 * @dma_area: virtual buffer address
61 * @dma_addr: physical buffer address (not accessible from main CPU)
62 * @dma_bytes: size of DMA area
63 * @dma_buffer_p: runtime dma buffer pointer
64 * @active_tasks: count of active tasks
65 * @total_tasks: count of all tasks
66 * @task_seqno: last task sequence number (!= 0)
67 * @tasks: list of all tasks
68 */
69struct snd_compr_runtime {
70 snd_pcm_state_t state;
71 struct snd_compr_ops *ops;
72 void *buffer;
73 u64 buffer_size;
74 u32 fragment_size;
75 u32 fragments;
76 u64 total_bytes_available;
77 u64 total_bytes_transferred;
78 wait_queue_head_t sleep;
79 void *private_data;
80
81 unsigned char *dma_area;
82 dma_addr_t dma_addr;
83 size_t dma_bytes;
84 struct snd_dma_buffer *dma_buffer_p;
85
86#if IS_ENABLED(CONFIG_SND_COMPRESS_ACCEL)
87 u32 active_tasks;
88 u32 total_tasks;
89 u64 task_seqno;
90 struct list_head tasks;
91#endif
92};
93
94/**
95 * struct snd_compr_stream: compressed stream
96 * @name: device name
97 * @ops: pointer to DSP callbacks
98 * @runtime: pointer to runtime structure
99 * @device: device pointer
100 * @error_work: delayed work used when closing the stream due to an error
101 * @direction: stream direction, playback/recording
102 * @metadata_set: metadata set flag, true when set
103 * @next_track: has userspace signal next track transition, true when set
104 * @partial_drain: undergoing partial_drain for stream, true when set
105 * @pause_in_draining: paused during draining state, true when set
106 * @private_data: pointer to DSP private data
107 * @dma_buffer: allocated buffer if any
108 */
109struct snd_compr_stream {
110 const char *name;
111 struct snd_compr_ops *ops;
112 struct snd_compr_runtime *runtime;
113 struct snd_compr *device;
114 struct delayed_work error_work;
115 enum snd_compr_direction direction;
116 bool metadata_set;
117 bool next_track;
118 bool partial_drain;
119 bool pause_in_draining;
120 void *private_data;
121 struct snd_dma_buffer dma_buffer;
122};
123
124/**
125 * struct snd_compr_ops: compressed path DSP operations
126 * @open: Open the compressed stream
127 * This callback is mandatory and shall keep dsp ready to receive the stream
128 * parameter
129 * @free: Close the compressed stream, mandatory
130 * @set_params: Sets the compressed stream parameters, mandatory
131 * This can be called in during stream creation only to set codec params
132 * and the stream properties
133 * @get_params: retrieve the codec parameters, mandatory
134 * @set_metadata: Set the metadata values for a stream
135 * @get_metadata: retrieves the requested metadata values from stream
136 * @trigger: Trigger operations like start, pause, resume, drain, stop.
137 * This callback is mandatory
138 * @pointer: Retrieve current h/w pointer information. Mandatory
139 * @copy: Copy the compressed data to/from userspace, Optional
140 * Can't be implemented if DSP supports mmap
141 * @mmap: DSP mmap method to mmap DSP memory
142 * @ack: Ack for DSP when data is written to audio buffer, Optional
143 * Not valid if copy is implemented
144 * @get_caps: Retrieve DSP capabilities, mandatory
145 * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory
146 * @task_create: Create a set of input/output buffers for accel operations
147 * @task_start: Start (queue) a task for accel operations
148 * @task_stop: Stop (dequeue) a task for accel operations
149 * @task_free: Free a set of input/output buffers for accel operations
150 */
151struct snd_compr_ops {
152 int (*open)(struct snd_compr_stream *stream);
153 int (*free)(struct snd_compr_stream *stream);
154 int (*set_params)(struct snd_compr_stream *stream,
155 struct snd_compr_params *params);
156 int (*get_params)(struct snd_compr_stream *stream,
157 struct snd_codec *params);
158 int (*set_metadata)(struct snd_compr_stream *stream,
159 struct snd_compr_metadata *metadata);
160 int (*get_metadata)(struct snd_compr_stream *stream,
161 struct snd_compr_metadata *metadata);
162 int (*trigger)(struct snd_compr_stream *stream, int cmd);
163 int (*pointer)(struct snd_compr_stream *stream,
164 struct snd_compr_tstamp *tstamp);
165 int (*copy)(struct snd_compr_stream *stream, char __user *buf,
166 size_t count);
167 int (*mmap)(struct snd_compr_stream *stream,
168 struct vm_area_struct *vma);
169 int (*ack)(struct snd_compr_stream *stream, size_t bytes);
170 int (*get_caps) (struct snd_compr_stream *stream,
171 struct snd_compr_caps *caps);
172 int (*get_codec_caps) (struct snd_compr_stream *stream,
173 struct snd_compr_codec_caps *codec);
174#if IS_ENABLED(CONFIG_SND_COMPRESS_ACCEL)
175 int (*task_create) (struct snd_compr_stream *stream, struct snd_compr_task_runtime *task);
176 int (*task_start) (struct snd_compr_stream *stream, struct snd_compr_task_runtime *task);
177 int (*task_stop) (struct snd_compr_stream *stream, struct snd_compr_task_runtime *task);
178 int (*task_free) (struct snd_compr_stream *stream, struct snd_compr_task_runtime *task);
179#endif
180};
181
182/**
183 * struct snd_compr: Compressed device
184 * @name: DSP device name
185 * @dev: associated device instance
186 * @ops: pointer to DSP callbacks
187 * @private_data: pointer to DSP pvt data
188 * @card: sound card pointer
189 * @direction: Playback or capture direction
190 * @lock: device lock
191 * @device: device id
192 * @use_pause_in_draining: allow pause in draining, true when set
193 */
194struct snd_compr {
195 const char *name;
196 struct device *dev;
197 struct snd_compr_ops *ops;
198 void *private_data;
199 struct snd_card *card;
200 unsigned int direction;
201 struct mutex lock;
202 int device;
203 bool use_pause_in_draining;
204#ifdef CONFIG_SND_VERBOSE_PROCFS
205 /* private: */
206 char id[64];
207 struct snd_info_entry *proc_root;
208 struct snd_info_entry *proc_info_entry;
209#endif
210};
211
212/* compress device register APIs */
213int snd_compress_new(struct snd_card *card, int device,
214 int type, const char *id, struct snd_compr *compr);
215
216/**
217 * snd_compr_use_pause_in_draining - Allow pause and resume in draining state
218 * @substream: compress substream to set
219 *
220 * Allow pause and resume in draining state.
221 * Only HW driver supports this transition can call this API.
222 */
223static inline void snd_compr_use_pause_in_draining(struct snd_compr_stream *substream)
224{
225 substream->device->use_pause_in_draining = true;
226}
227
228/* dsp driver callback apis
229 * For playback: driver should call snd_compress_fragment_elapsed() to let the
230 * framework know that a fragment has been consumed from the ring buffer
231 *
232 * For recording: we want to know when a frame is available or when
233 * at least one frame is available so snd_compress_frame_elapsed()
234 * callback should be called when a encodeded frame is available
235 */
236static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
237{
238 wake_up(&stream->runtime->sleep);
239}
240
241static inline void snd_compr_drain_notify(struct snd_compr_stream *stream)
242{
243 if (snd_BUG_ON(!stream))
244 return;
245
246 /* for partial_drain case we are back to running state on success */
247 if (stream->partial_drain) {
248 stream->runtime->state = SNDRV_PCM_STATE_RUNNING;
249 stream->partial_drain = false; /* clear this flag as well */
250 } else {
251 stream->runtime->state = SNDRV_PCM_STATE_SETUP;
252 }
253
254 wake_up(&stream->runtime->sleep);
255}
256
257/**
258 * snd_compr_set_runtime_buffer - Set the Compress runtime buffer
259 * @stream: compress stream to set
260 * @bufp: the buffer information, NULL to clear
261 *
262 * Copy the buffer information to runtime buffer when @bufp is non-NULL.
263 * Otherwise it clears the current buffer information.
264 */
265static inline void
266snd_compr_set_runtime_buffer(struct snd_compr_stream *stream,
267 struct snd_dma_buffer *bufp)
268{
269 struct snd_compr_runtime *runtime = stream->runtime;
270
271 if (bufp) {
272 runtime->dma_buffer_p = bufp;
273 runtime->dma_area = bufp->area;
274 runtime->dma_addr = bufp->addr;
275 runtime->dma_bytes = bufp->bytes;
276 } else {
277 runtime->dma_buffer_p = NULL;
278 runtime->dma_area = NULL;
279 runtime->dma_addr = 0;
280 runtime->dma_bytes = 0;
281 }
282}
283
284int snd_compr_malloc_pages(struct snd_compr_stream *stream, size_t size);
285int snd_compr_free_pages(struct snd_compr_stream *stream);
286
287int snd_compr_stop_error(struct snd_compr_stream *stream,
288 snd_pcm_state_t state);
289
290#if IS_ENABLED(CONFIG_SND_COMPRESS_ACCEL)
291void snd_compr_task_finished(struct snd_compr_stream *stream,
292 struct snd_compr_task_runtime *task);
293#endif
294
295#endif
296

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source code of linux/include/sound/compress_driver.h