1 /* 2 * compress_driver.h - compress offload driver definations 3 * 4 * Copyright (C) 2011 Intel Corporation 5 * Authors: Vinod Koul <vinod.koul@linux.intel.com> 6 * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> 7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; version 2 of the License. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 21 * 22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 23 * 24 */ 25 #ifndef __COMPRESS_DRIVER_H 26 #define __COMPRESS_DRIVER_H 27 28 #include <linux/types.h> 29 #include <linux/sched.h> 30 #include <sound/compress_offload.h> 31 #include <sound/asound.h> 32 #include <sound/pcm.h> 33 34 struct snd_compr_ops; 35 36 /** 37 * struct snd_compr_runtime: runtime stream description 38 * @state: stream state 39 * @ops: pointer to DSP callbacks 40 * @buffer: pointer to kernel buffer, valid only when not in mmap mode or 41 * DSP doesn't implement copy 42 * @buffer_size: size of the above buffer 43 * @fragment_size: size of buffer fragment in bytes 44 * @fragments: number of such fragments 45 * @hw_pointer: offset of last location in buffer where DSP copied data 46 * @app_pointer: offset of last location in buffer where app wrote data 47 * @total_bytes_available: cumulative number of bytes made available in 48 * the ring buffer 49 * @total_bytes_transferred: cumulative bytes transferred by offload DSP 50 * @sleep: poll sleep 51 */ 52 struct snd_compr_runtime { 53 snd_pcm_state_t state; 54 struct snd_compr_ops *ops; 55 void *buffer; 56 u64 buffer_size; 57 u32 fragment_size; 58 u32 fragments; 59 u64 hw_pointer; 60 u64 app_pointer; 61 u64 total_bytes_available; 62 u64 total_bytes_transferred; 63 wait_queue_head_t sleep; 64 void *private_data; 65 }; 66 67 /** 68 * struct snd_compr_stream: compressed stream 69 * @name: device name 70 * @ops: pointer to DSP callbacks 71 * @runtime: pointer to runtime structure 72 * @device: device pointer 73 * @direction: stream direction, playback/recording 74 * @private_data: pointer to DSP private data 75 */ 76 struct snd_compr_stream { 77 const char *name; 78 struct snd_compr_ops *ops; 79 struct snd_compr_runtime *runtime; 80 struct snd_compr *device; 81 enum snd_compr_direction direction; 82 void *private_data; 83 }; 84 85 /** 86 * struct snd_compr_ops: compressed path DSP operations 87 * @open: Open the compressed stream 88 * This callback is mandatory and shall keep dsp ready to receive the stream 89 * parameter 90 * @free: Close the compressed stream, mandatory 91 * @set_params: Sets the compressed stream parameters, mandatory 92 * This can be called in during stream creation only to set codec params 93 * and the stream properties 94 * @get_params: retrieve the codec parameters, mandatory 95 * @trigger: Trigger operations like start, pause, resume, drain, stop. 96 * This callback is mandatory 97 * @pointer: Retrieve current h/w pointer information. Mandatory 98 * @copy: Copy the compressed data to/from userspace, Optional 99 * Can't be implemented if DSP supports mmap 100 * @mmap: DSP mmap method to mmap DSP memory 101 * @ack: Ack for DSP when data is written to audio buffer, Optional 102 * Not valid if copy is implemented 103 * @get_caps: Retrieve DSP capabilities, mandatory 104 * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory 105 */ 106 struct snd_compr_ops { 107 int (*open)(struct snd_compr_stream *stream); 108 int (*free)(struct snd_compr_stream *stream); 109 int (*set_params)(struct snd_compr_stream *stream, 110 struct snd_compr_params *params); 111 int (*get_params)(struct snd_compr_stream *stream, 112 struct snd_codec *params); 113 int (*trigger)(struct snd_compr_stream *stream, int cmd); 114 int (*pointer)(struct snd_compr_stream *stream, 115 struct snd_compr_tstamp *tstamp); 116 int (*copy)(struct snd_compr_stream *stream, const char __user *buf, 117 size_t count); 118 int (*mmap)(struct snd_compr_stream *stream, 119 struct vm_area_struct *vma); 120 int (*ack)(struct snd_compr_stream *stream, size_t bytes); 121 int (*get_caps) (struct snd_compr_stream *stream, 122 struct snd_compr_caps *caps); 123 int (*get_codec_caps) (struct snd_compr_stream *stream, 124 struct snd_compr_codec_caps *codec); 125 }; 126 127 /** 128 * struct snd_compr: Compressed device 129 * @name: DSP device name 130 * @dev: Device pointer 131 * @ops: pointer to DSP callbacks 132 * @private_data: pointer to DSP pvt data 133 * @card: sound card pointer 134 * @direction: Playback or capture direction 135 * @lock: device lock 136 * @device: device id 137 */ 138 struct snd_compr { 139 const char *name; 140 struct device *dev; 141 struct snd_compr_ops *ops; 142 void *private_data; 143 struct snd_card *card; 144 unsigned int direction; 145 struct mutex lock; 146 int device; 147 }; 148 149 /* compress device register APIs */ 150 int snd_compress_register(struct snd_compr *device); 151 int snd_compress_deregister(struct snd_compr *device); 152 int snd_compress_new(struct snd_card *card, int device, 153 int type, struct snd_compr *compr); 154 155 /* dsp driver callback apis 156 * For playback: driver should call snd_compress_fragment_elapsed() to let the 157 * framework know that a fragment has been consumed from the ring buffer 158 * 159 * For recording: we want to know when a frame is available or when 160 * at least one frame is available so snd_compress_frame_elapsed() 161 * callback should be called when a encodeded frame is available 162 */ 163 static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream) 164 { 165 wake_up(&stream->runtime->sleep); 166 } 167 168 #endif 169