1 files changed, 138 insertions, 0 deletions

diff --git a/include/sound/soc-dpcm.h b/include/sound/soc-dpcm.h
new file mode 100644
index 000000000000..04598f1efd77
--- /dev/null
+++ b/include/sound/soc-dpcm.h
@@ -0,0 +1,138 @@
+/*
+ * linux/sound/soc-dpcm.h -- ALSA SoC Dynamic PCM Support
+ *
+ * Author:              Liam Girdwood <lrg@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_SND_SOC_DPCM_H
+#define __LINUX_SND_SOC_DPCM_H
+
+#include <linux/list.h>
+#include <sound/pcm.h>
+
+struct snd_soc_pcm_runtime;
+
+/*
+ * Types of runtime_update to perform. e.g. originated from FE PCM ops
+ * or audio route changes triggered by muxes/mixers.
+ */
+enum snd_soc_dpcm_update {
+        SND_SOC_DPCM_UPDATE_NO  = 0,
+        SND_SOC_DPCM_UPDATE_BE,
+        SND_SOC_DPCM_UPDATE_FE,
+};
+
+/*
+ * Dynamic PCM Frontend -> Backend link management states.
+ */
+enum snd_soc_dpcm_link_state {
+        SND_SOC_DPCM_LINK_STATE_NEW     = 0,    /* newly created link */
+        SND_SOC_DPCM_LINK_STATE_FREE,           /* link to be dismantled */
+};
+
+/*
+ * Dynamic PCM Frontend -> Backend link PCM states.
+ */
+enum snd_soc_dpcm_state {
+        SND_SOC_DPCM_STATE_NEW  = 0,
+        SND_SOC_DPCM_STATE_OPEN,
+        SND_SOC_DPCM_STATE_HW_PARAMS,
+        SND_SOC_DPCM_STATE_PREPARE,
+        SND_SOC_DPCM_STATE_START,
+        SND_SOC_DPCM_STATE_STOP,
+        SND_SOC_DPCM_STATE_PAUSED,
+        SND_SOC_DPCM_STATE_SUSPEND,
+        SND_SOC_DPCM_STATE_HW_FREE,
+        SND_SOC_DPCM_STATE_CLOSE,
+};
+
+/*
+ * Dynamic PCM trigger ordering. Triggering flexibility is required as some
+ * DSPs require triggering before/after their CPU platform and DAIs.
+ *
+ * i.e. some clients may want to manually order this call in their PCM
+ * trigger() whilst others will just use the regular core ordering.
+ */
+enum snd_soc_dpcm_trigger {
+        SND_SOC_DPCM_TRIGGER_PRE                = 0,
+        SND_SOC_DPCM_TRIGGER_POST,
+        SND_SOC_DPCM_TRIGGER_BESPOKE,
+};
+
+/*
+ * Dynamic PCM link
+ * This links together a FE and BE DAI at runtime and stores the link
+ * state information and the hw_params configuration.
+ */
+struct snd_soc_dpcm {
+        /* FE and BE DAIs*/
+        struct snd_soc_pcm_runtime *be;
+        struct snd_soc_pcm_runtime *fe;
+
+        /* link state */
+        enum snd_soc_dpcm_link_state state;
+
+        /* list of BE and FE for this DPCM link */
+        struct list_head list_be;
+        struct list_head list_fe;
+
+        /* hw params for this link - may be different for each link */
+        struct snd_pcm_hw_params hw_params;
+#ifdef CONFIG_DEBUG_FS
+        struct dentry *debugfs_state;
+#endif
+};
+
+/*
+ * Dynamic PCM runtime data.
+ */
+struct snd_soc_dpcm_runtime {
+        struct list_head be_clients;
+        struct list_head fe_clients;
+
+        int users;
+        struct snd_pcm_runtime *runtime;
+        struct snd_pcm_hw_params hw_params;
+
+        /* state and update */
+        enum snd_soc_dpcm_update runtime_update;
+        enum snd_soc_dpcm_state state;
+};
+
+/* can this BE stop and free */
+int snd_soc_dpcm_can_be_free_stop(struct snd_soc_pcm_runtime *fe,
+                struct snd_soc_pcm_runtime *be, int stream);
+
+/* can this BE perform a hw_params() */
+int snd_soc_dpcm_can_be_params(struct snd_soc_pcm_runtime *fe,
+                struct snd_soc_pcm_runtime *be, int stream);
+
+/* is the current PCM operation for this FE ? */
+int snd_soc_dpcm_fe_can_update(struct snd_soc_pcm_runtime *fe, int stream);
+
+/* is the current PCM operation for this BE ? */
+int snd_soc_dpcm_be_can_update(struct snd_soc_pcm_runtime *fe,
+                struct snd_soc_pcm_runtime *be, int stream);
+
+/* get the substream for this BE */
+struct snd_pcm_substream *
+        snd_soc_dpcm_get_substream(struct snd_soc_pcm_runtime *be, int stream);
+
+/* get the BE runtime state */
+enum snd_soc_dpcm_state
+        snd_soc_dpcm_be_get_state(struct snd_soc_pcm_runtime *be, int stream);
+
+/* set the BE runtime state */
+void snd_soc_dpcm_be_set_state(struct snd_soc_pcm_runtime *be, int stream,
+        enum snd_soc_dpcm_state state);
+
+/* internal use only */
+int soc_dpcm_be_digital_mute(struct snd_soc_pcm_runtime *fe, int mute);
+int soc_dpcm_debugfs_add(struct snd_soc_pcm_runtime *rtd);
+int soc_dpcm_runtime_update(struct snd_soc_dapm_widget *);
+
+#endif