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 */
snd_compr_use_pause_in_draining(struct snd_compr_stream * substream)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 */
snd_compr_fragment_elapsed(struct snd_compr_stream * stream)191 static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream)
192 {
193 wake_up(&stream->runtime->sleep);
194 }
195
snd_compr_drain_notify(struct snd_compr_stream * stream)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
snd_compr_set_runtime_buffer(struct snd_compr_stream * stream,struct snd_dma_buffer * bufp)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
