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Diffstat (limited to 'include/sound/compress_driver.h')
| -rw-r--r-- | include/sound/compress_driver.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/include/sound/compress_driver.h b/include/sound/compress_driver.h new file mode 100644 index 000000000000..48f2a1ff2bbc --- /dev/null +++ b/include/sound/compress_driver.h @@ -0,0 +1,167 @@ +/* + * compress_driver.h - compress offload driver definations + * + * Copyright (C) 2011 Intel Corporation + * Authors: Vinod Koul <vinod.koul@linux.intel.com> + * Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + * + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + */ +#ifndef __COMPRESS_DRIVER_H +#define __COMPRESS_DRIVER_H + +#include <linux/types.h> +#include <linux/sched.h> +#include <sound/compress_offload.h> +#include <sound/asound.h> +#include <sound/pcm.h> + +struct snd_compr_ops; + +/** + * struct snd_compr_runtime: runtime stream description + * @state: stream state + * @ops: pointer to DSP callbacks + * @buffer: pointer to kernel buffer, valid only when not in mmap mode or + * DSP doesn't implement copy + * @buffer_size: size of the above buffer + * @fragment_size: size of buffer fragment in bytes + * @fragments: number of such fragments + * @hw_pointer: offset of last location in buffer where DSP copied data + * @app_pointer: offset of last location in buffer where app wrote data + * @total_bytes_available: cumulative number of bytes made available in + * the ring buffer + * @total_bytes_transferred: cumulative bytes transferred by offload DSP + * @sleep: poll sleep + */ +struct snd_compr_runtime { + snd_pcm_state_t state; + struct snd_compr_ops *ops; + void *buffer; + u64 buffer_size; + u32 fragment_size; + u32 fragments; + u64 hw_pointer; + u64 app_pointer; + u64 total_bytes_available; + u64 total_bytes_transferred; + wait_queue_head_t sleep; +}; + +/** + * struct snd_compr_stream: compressed stream + * @name: device name + * @ops: pointer to DSP callbacks + * @runtime: pointer to runtime structure + * @device: device pointer + * @direction: stream direction, playback/recording + * @private_data: pointer to DSP private data + */ +struct snd_compr_stream { + const char *name; + struct snd_compr_ops *ops; + struct snd_compr_runtime *runtime; + struct snd_compr *device; + enum snd_compr_direction direction; + void *private_data; +}; + +/** + * struct snd_compr_ops: compressed path DSP operations + * @open: Open the compressed stream + * This callback is mandatory and shall keep dsp ready to receive the stream + * parameter + * @free: Close the compressed stream, mandatory + * @set_params: Sets the compressed stream parameters, mandatory + * This can be called in during stream creation only to set codec params + * and the stream properties + * @get_params: retrieve the codec parameters, mandatory + * @trigger: Trigger operations like start, pause, resume, drain, stop. + * This callback is mandatory + * @pointer: Retrieve current h/w pointer information. Mandatory + * @copy: Copy the compressed data to/from userspace, Optional + * Can't be implemented if DSP supports mmap + * @mmap: DSP mmap method to mmap DSP memory + * @ack: Ack for DSP when data is written to audio buffer, Optional + * Not valid if copy is implemented + * @get_caps: Retrieve DSP capabilities, mandatory + * @get_codec_caps: Retrieve capabilities for a specific codec, mandatory + */ +struct snd_compr_ops { + int (*open)(struct snd_compr_stream *stream); + int (*free)(struct snd_compr_stream *stream); + int (*set_params)(struct snd_compr_stream *stream, + struct snd_compr_params *params); + int (*get_params)(struct snd_compr_stream *stream, + struct snd_codec *params); + int (*trigger)(struct snd_compr_stream *stream, int cmd); + int (*pointer)(struct snd_compr_stream *stream, + struct snd_compr_tstamp *tstamp); + int (*copy)(struct snd_compr_stream *stream, const char __user *buf, + size_t count); + int (*mmap)(struct snd_compr_stream *stream, + struct vm_area_struct *vma); + int (*ack)(struct snd_compr_stream *stream, size_t bytes); + int (*get_caps) (struct snd_compr_stream *stream, + struct snd_compr_caps *caps); + int (*get_codec_caps) (struct snd_compr_stream *stream, + struct snd_compr_codec_caps *codec); +}; + +/** + * struct snd_compr: Compressed device + * @name: DSP device name + * @dev: Device pointer + * @ops: pointer to DSP callbacks + * @private_data: pointer to DSP pvt data + * @card: sound card pointer + * @direction: Playback or capture direction + * @lock: device lock + * @device: device id + */ +struct snd_compr { + const char *name; + struct device *dev; + struct snd_compr_ops *ops; + void *private_data; + struct snd_card *card; + unsigned int direction; + struct mutex lock; + int device; +}; + +/* compress device register APIs */ +int snd_compress_register(struct snd_compr *device); +int snd_compress_deregister(struct snd_compr *device); +int snd_compress_new(struct snd_card *card, int device, + int type, struct snd_compr *compr); + +/* dsp driver callback apis + * For playback: driver should call snd_compress_fragment_elapsed() to let the + * framework know that a fragment has been consumed from the ring buffer + * + * For recording: we want to know when a frame is available or when + * at least one frame is available so snd_compress_frame_elapsed() + * callback should be called when a encodeded frame is available + */ +static inline void snd_compr_fragment_elapsed(struct snd_compr_stream *stream) +{ + wake_up(&stream->runtime->sleep); +} + +#endif |