diff options
Diffstat (limited to 'include/sound/pcm.h')
| -rw-r--r-- | include/sound/pcm.h | 160 |
1 files changed, 153 insertions, 7 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 5c3310d7d4b8..f78a5722f5cc 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -533,6 +533,12 @@ snd_pcm_debug_name(struct snd_pcm_substream *substream, char *buf, size_t size) * PCM library */ +/** + * snd_pcm_stream_linked - Check whether the substream is linked with others + * @substream: substream to check + * + * Returns true if the given substream is being linked with others. + */ static inline int snd_pcm_stream_linked(struct snd_pcm_substream *substream) { return substream->group != &substream->self_group; @@ -543,6 +549,16 @@ void snd_pcm_stream_unlock(struct snd_pcm_substream *substream); void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream); void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream); unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream); + +/** + * snd_pcm_stream_lock_irqsave - Lock the PCM stream + * @substream: PCM substream + * @flags: irq flags + * + * This locks the PCM stream like snd_pcm_stream_lock() but with the local + * IRQ (only when nonatomic is false). In nonatomic case, this is identical + * as snd_pcm_stream_lock(). + */ #define snd_pcm_stream_lock_irqsave(substream, flags) \ do { \ typecheck(unsigned long, flags); \ @@ -551,9 +567,25 @@ unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream); void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, unsigned long flags); +/** + * snd_pcm_group_for_each_entry - iterate over the linked substreams + * @s: the iterator + * @substream: the substream + * + * Iterate over the all linked substreams to the given @substream. + * When @substream isn't linked with any others, this gives returns @substream + * itself once. + */ #define snd_pcm_group_for_each_entry(s, substream) \ list_for_each_entry(s, &substream->group->substreams, link_list) +/** + * snd_pcm_running - Check whether the substream is in a running state + * @substream: substream to check + * + * Returns true if the given substream is in the state RUNNING, or in the + * state DRAINING for playback. + */ static inline int snd_pcm_running(struct snd_pcm_substream *substream) { return (substream->runtime->status->state == SNDRV_PCM_STATE_RUNNING || @@ -561,45 +593,81 @@ static inline int snd_pcm_running(struct snd_pcm_substream *substream) substream->stream == SNDRV_PCM_STREAM_PLAYBACK)); } +/** + * bytes_to_samples - Unit conversion of the size from bytes to samples + * @runtime: PCM runtime instance + * @size: size in bytes + */ static inline ssize_t bytes_to_samples(struct snd_pcm_runtime *runtime, ssize_t size) { return size * 8 / runtime->sample_bits; } +/** + * bytes_to_frames - Unit conversion of the size from bytes to frames + * @runtime: PCM runtime instance + * @size: size in bytes + */ static inline snd_pcm_sframes_t bytes_to_frames(struct snd_pcm_runtime *runtime, ssize_t size) { return size * 8 / runtime->frame_bits; } +/** + * samples_to_bytes - Unit conversion of the size from samples to bytes + * @runtime: PCM runtime instance + * @size: size in samples + */ static inline ssize_t samples_to_bytes(struct snd_pcm_runtime *runtime, ssize_t size) { return size * runtime->sample_bits / 8; } +/** + * frames_to_bytes - Unit conversion of the size from frames to bytes + * @runtime: PCM runtime instance + * @size: size in frames + */ static inline ssize_t frames_to_bytes(struct snd_pcm_runtime *runtime, snd_pcm_sframes_t size) { return size * runtime->frame_bits / 8; } +/** + * frame_aligned - Check whether the byte size is aligned to frames + * @runtime: PCM runtime instance + * @bytes: size in bytes + */ static inline int frame_aligned(struct snd_pcm_runtime *runtime, ssize_t bytes) { return bytes % runtime->byte_align == 0; } +/** + * snd_pcm_lib_buffer_bytes - Get the buffer size of the current PCM in bytes + * @substream: PCM substream + */ static inline size_t snd_pcm_lib_buffer_bytes(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; return frames_to_bytes(runtime, runtime->buffer_size); } +/** + * snd_pcm_lib_period_bytes - Get the period size of the current PCM in bytes + * @substream: PCM substream + */ static inline size_t snd_pcm_lib_period_bytes(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; return frames_to_bytes(runtime, runtime->period_size); } -/* - * result is: 0 ... (boundary - 1) +/** + * snd_pcm_playback_avail - Get the available (writable) space for playback + * @runtime: PCM runtime instance + * + * Result is between 0 ... (boundary - 1) */ static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *runtime) { @@ -611,8 +679,11 @@ static inline snd_pcm_uframes_t snd_pcm_playback_avail(struct snd_pcm_runtime *r return avail; } -/* - * result is: 0 ... (boundary - 1) +/** + * snd_pcm_playback_avail - Get the available (readable) space for capture + * @runtime: PCM runtime instance + * + * Result is between 0 ... (boundary - 1) */ static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *runtime) { @@ -622,11 +693,19 @@ static inline snd_pcm_uframes_t snd_pcm_capture_avail(struct snd_pcm_runtime *ru return avail; } +/** + * snd_pcm_playback_hw_avail - Get the queued space for playback + * @runtime: PCM runtime instance + */ static inline snd_pcm_sframes_t snd_pcm_playback_hw_avail(struct snd_pcm_runtime *runtime) { return runtime->buffer_size - snd_pcm_playback_avail(runtime); } +/** + * snd_pcm_capture_hw_avail - Get the free space for capture + * @runtime: PCM runtime instance + */ static inline snd_pcm_sframes_t snd_pcm_capture_hw_avail(struct snd_pcm_runtime *runtime) { return runtime->buffer_size - snd_pcm_capture_avail(runtime); @@ -706,6 +785,20 @@ static inline int snd_pcm_capture_empty(struct snd_pcm_substream *substream) return snd_pcm_capture_avail(runtime) == 0; } +/** + * snd_pcm_trigger_done - Mark the master substream + * @substream: the pcm substream instance + * @master: the linked master substream + * + * When multiple substreams of the same card are linked and the hardware + * supports the single-shot operation, the driver calls this in the loop + * in snd_pcm_group_for_each_entry() for marking the substream as "done". + * Then most of trigger operations are performed only to the given master + * substream. + * + * The trigger_master mark is cleared at timestamp updates at the end + * of trigger operations. + */ static inline void snd_pcm_trigger_done(struct snd_pcm_substream *substream, struct snd_pcm_substream *master) { @@ -881,6 +974,14 @@ unsigned int snd_pcm_rate_bit_to_rate(unsigned int rate_bit); unsigned int snd_pcm_rate_mask_intersect(unsigned int rates_a, unsigned int rates_b); +/** + * snd_pcm_set_runtime_buffer - Set the PCM runtime buffer + * @substream: PCM substream to set + * @bufp: the buffer information, NULL to clear + * + * Copy the buffer information to runtime->dma_buffer when @bufp is non-NULL. + * Otherwise it clears the current buffer information. + */ static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream, struct snd_dma_buffer *bufp) { @@ -906,6 +1007,11 @@ void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream); void snd_pcm_timer_init(struct snd_pcm_substream *substream); void snd_pcm_timer_done(struct snd_pcm_substream *substream); +/** + * snd_pcm_gettime - Fill the timespec depending on the timestamp mode + * @runtime: PCM runtime instance + * @tv: timespec to fill + */ static inline void snd_pcm_gettime(struct snd_pcm_runtime *runtime, struct timespec *tv) { @@ -997,18 +1103,35 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, #define snd_pcm_sgbuf_ops_page NULL #endif /* SND_DMA_SGBUF */ +/** + * snd_pcm_sgbuf_get_addr - Get the DMA address at the corresponding offset + * @substream: PCM substream + * @ofs: byte offset + */ static inline dma_addr_t snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs) { return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs); } +/** + * snd_pcm_sgbuf_get_ptr - Get the virtual address at the corresponding offset + * @substream: PCM substream + * @ofs: byte offset + */ static inline void * snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) { return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs); } +/** + * snd_pcm_sgbuf_chunk_size - Compute the max size that fits within the contig. + * page from the given size + * @substream: PCM substream + * @ofs: byte offset + * @size: byte size to examine + */ static inline unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, unsigned int ofs, unsigned int size) @@ -1016,13 +1139,24 @@ snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, 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 */ +/** + * snd_pcm_mmap_data_open - increase the mmap counter + * @area: VMA + * + * PCM mmap callback should handle this counter properly + */ static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) { struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; atomic_inc(&substream->mmap_count); } +/** + * snd_pcm_mmap_data_close - decrease the mmap counter + * @area: VMA + * + * PCM mmap callback should handle this counter properly + */ static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) { struct snd_pcm_substream *substream = (struct snd_pcm_substream *)area->vm_private_data; @@ -1042,6 +1176,11 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_s #define snd_pcm_lib_mmap_vmalloc NULL +/** + * snd_pcm_limit_isa_dma_size - Get the max size fitting with ISA DMA transfer + * @dma: DMA number + * @max: pointer to store the max size + */ static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max) { *max = dma < 4 ? 64 * 1024 : 128 * 1024; @@ -1094,7 +1233,11 @@ struct snd_pcm_chmap { void *private_data; /* optional: private data pointer */ }; -/* get the PCM substream assigned to the given chmap info */ +/** + * snd_pcm_chmap_substream - get the PCM substream assigned to the given chmap info + * @info: chmap information + * @idx: the substream number index + */ static inline struct snd_pcm_substream * snd_pcm_chmap_substream(struct snd_pcm_chmap *info, unsigned int idx) { @@ -1121,7 +1264,10 @@ int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream, unsigned long private_value, struct snd_pcm_chmap **info_ret); -/* Strong-typed conversion of pcm_format to bitwise */ +/** + * pcm_format_to_bits - Strong-typed conversion of pcm_format to bitwise + * @pcm_format: PCM format + */ static inline u64 pcm_format_to_bits(snd_pcm_format_t pcm_format) { return 1ULL << (__force int) pcm_format; |