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-rw-r--r--include/sound/pcm.h87
1 files changed, 62 insertions, 25 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index d0711bc8c914..6268a4192d5c 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -437,6 +437,7 @@ struct snd_pcm_str {
struct snd_info_entry *proc_xrun_debug_entry;
#endif
#endif
+ struct snd_kcontrol *chmap_kctl; /* channel-mapping controls */
};
struct snd_pcm {
@@ -982,53 +983,42 @@ static int snd_pcm_lib_alloc_vmalloc_32_buffer
_snd_pcm_lib_alloc_vmalloc_buffer \
(subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
+#define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
+
#ifdef CONFIG_SND_DMA_SGBUF
/*
* SG-buffer handling
*/
#define snd_pcm_substream_sgbuf(substream) \
- ((substream)->runtime->dma_buffer_p->private_data)
-
-static inline dma_addr_t
-snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
-{
- struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
- return snd_sgbuf_get_addr(sg, ofs);
-}
-
-static inline void *
-snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
-{
- struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
- return snd_sgbuf_get_ptr(sg, ofs);
-}
+ snd_pcm_get_dma_buf(substream)->private_data
struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
unsigned long offset);
-unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
- unsigned int ofs, unsigned int size);
-
#else /* !SND_DMA_SGBUF */
/*
* fake using a continuous buffer
*/
+#define snd_pcm_sgbuf_ops_page NULL
+#endif /* SND_DMA_SGBUF */
+
static inline dma_addr_t
snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
{
- return substream->runtime->dma_addr + ofs;
+ return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
}
static inline void *
snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
{
- return substream->runtime->dma_area + ofs;
+ return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
}
-#define snd_pcm_sgbuf_ops_page NULL
-
-#define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size) (size)
-
-#endif /* SND_DMA_SGBUF */
+static inline unsigned int
+snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
+ unsigned int ofs, unsigned int size)
+{
+ return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
+}
/* handle mmap counter - PCM mmap callback should handle this counter properly */
static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
@@ -1086,4 +1076,51 @@ static inline const char *snd_pcm_stream_str(struct snd_pcm_substream *substream
return "Capture";
}
+/*
+ * PCM channel-mapping control API
+ */
+/* array element of channel maps */
+struct snd_pcm_chmap_elem {
+ unsigned char channels;
+ unsigned char map[15];
+};
+
+/* channel map information; retrieved via snd_kcontrol_chip() */
+struct snd_pcm_chmap {
+ struct snd_pcm *pcm; /* assigned PCM instance */
+ int stream; /* PLAYBACK or CAPTURE */
+ struct snd_kcontrol *kctl;
+ const struct snd_pcm_chmap_elem *chmap;
+ unsigned int max_channels;
+ unsigned int channel_mask; /* optional: active channels bitmask */
+ void *private_data; /* optional: private data pointer */
+};
+
+/* get the PCM substream assigned to the given chmap info */
+static inline struct snd_pcm_substream *
+snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx)
+{
+ struct snd_pcm_substream *s;
+ for (s = info->pcm->streams[info->stream].substream; s; s = s->next)
+ if (s->number == idx)
+ return s;
+ return NULL;
+}
+
+/* ALSA-standard channel maps (RL/RR prior to C/LFE) */
+extern const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[];
+/* Other world's standard channel maps (C/LFE prior to RL/RR) */
+extern const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[];
+
+/* bit masks to be passed to snd_pcm_chmap.channel_mask field */
+#define SND_PCM_CHMAP_MASK_24 ((1U << 2) | (1U << 4))
+#define SND_PCM_CHMAP_MASK_246 (SND_PCM_CHMAP_MASK_24 | (1U << 6))
+#define SND_PCM_CHMAP_MASK_2468 (SND_PCM_CHMAP_MASK_246 | (1U << 8))
+
+int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
+ const struct snd_pcm_chmap_elem *chmap,
+ int max_channels,
+ unsigned long private_value,
+ struct snd_pcm_chmap **info_ret);
+
#endif /* __SOUND_PCM_H */