| Steve Muckle | f132c6c | 2012-06-06 18:30:57 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/sound/soc-dpcm.h -- ALSA SoC Dynamic PCM Support |
| 3 | * |
| 4 | * Author: Liam Girdwood <lrg@ti.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | */ |
| 10 | |
| 11 | #ifndef __LINUX_SND_SOC_DPCM_H |
| 12 | #define __LINUX_SND_SOC_DPCM_H |
| 13 | |
| 14 | #include <sound/pcm.h> |
| 15 | |
| 16 | /* |
| 17 | * Types of runtime_update to perform (e.g. originated from FE PCM ops |
| 18 | * or audio route changes triggered by muxes/mixers. |
| 19 | */ |
| 20 | #define SND_SOC_DPCM_UPDATE_NO 0 |
| 21 | #define SND_SOC_DPCM_UPDATE_BE 1 |
| 22 | #define SND_SOC_DPCM_UPDATE_FE 2 |
| 23 | |
| 24 | /* |
| 25 | * Dynamic PCM Frontend -> Backend link state. |
| 26 | */ |
| 27 | enum snd_soc_dpcm_link_state { |
| 28 | SND_SOC_DPCM_LINK_STATE_NEW = 0, /* newly created path */ |
| 29 | SND_SOC_DPCM_LINK_STATE_FREE, /* path to be dismantled */ |
| 30 | }; |
| 31 | |
| 32 | /* |
| 33 | * Dynamic PCM params link |
| 34 | * This links together a FE and BE DAI at runtime and stores the link |
| 35 | * state information and the hw_params configuration. |
| 36 | */ |
| 37 | struct snd_soc_dpcm_params { |
| 38 | /* FE and BE DAIs*/ |
| 39 | struct snd_soc_pcm_runtime *be; |
| 40 | struct snd_soc_pcm_runtime *fe; |
| 41 | |
| 42 | /* link state */ |
| 43 | enum snd_soc_dpcm_link_state state; |
| 44 | |
| 45 | struct list_head list_be; |
| 46 | struct list_head list_fe; |
| 47 | |
| 48 | /* hw params for this link - may be different for each link */ |
| 49 | struct snd_pcm_hw_params hw_params; |
| 50 | |
| 51 | #ifdef CONFIG_DEBUG_FS |
| 52 | struct dentry *debugfs_state; |
| 53 | #endif |
| 54 | }; |
| 55 | |
| 56 | /* |
| 57 | * Bespoke Trigger() Helper API |
| 58 | */ |
| 59 | |
| 60 | /* is the PCM operation for this FE ? */ |
| 61 | static inline int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, |
| 62 | int stream) |
| 63 | { |
| 64 | return (fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE); |
| 65 | } |
| 66 | |
| 67 | /* is the PCM operation for this BE ? */ |
| 68 | static inline int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe, |
| 69 | struct snd_soc_pcm_runtime *be, int stream) |
| 70 | { |
| 71 | if ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_FE) || |
| 72 | ((fe->dpcm[stream].runtime_update == SND_SOC_DPCM_UPDATE_BE) && |
| 73 | be->dpcm[stream].runtime_update)) |
| 74 | return 1; |
| 75 | else |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | /* trigger platform driver only */ |
| 80 | static inline int |
| 81 | snd_soc_dpcm_platform_trigger(struct snd_pcm_substream *substream, |
| 82 | int cmd, struct snd_soc_platform *platform) |
| 83 | { |
| 84 | if (platform->driver->ops->trigger) |
| 85 | return platform->driver->ops->trigger(substream, cmd); |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe, |
| 90 | struct snd_soc_pcm_runtime *be, int stream); |
| 91 | |
| 92 | static inline struct snd_pcm_substream * |
| 93 | snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream) |
| 94 | { |
| 95 | return be->pcm->streams[stream].substream; |
| 96 | } |
| 97 | |
| 98 | static inline enum snd_soc_dpcm_state |
| 99 | snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream) |
| 100 | { |
| 101 | return be->dpcm[stream].state; |
| 102 | } |
| 103 | |
| 104 | static inline void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, |
| 105 | int stream, enum snd_soc_dpcm_state state) |
| 106 | { |
| 107 | be->dpcm[stream].state = state; |
| 108 | } |
| 109 | #endif |