diff options
Diffstat (limited to 'pcm.c')
| -rw-r--r-- | pcm.c | 258 |
1 files changed, 30 insertions, 228 deletions
@@ -15,10 +15,20 @@ #define D_PRINTK(fmt, args...) DDEBUG(D_LOGNAME, fmt, ##args) #define D_ERRORK(fmt, args...) DERROR(D_LOGNAME, fmt, ##args) -#define DO_AUDIOPATH_CB(ap, callback, substream, ...) \ - (((ap)->pcm_ops->callback) ? \ - (ap)->pcm_ops->callback((substream), ##__VA_ARGS__) : \ - 0) +/** + * DO_AUDIOPATH_CB - Used to call into an Audio Path's ALSA PCM callback from + * AVIRT, where AVIRT's own callback must be attended to first. + */ +#define DO_AUDIOPATH_CB(ap, callback, substream, ...) \ + ((!substream->stream) ? \ + (((ap)->pcm_playback_ops->callback) ? \ + (ap)->pcm_playback_ops->callback((substream), \ + ##__VA_ARGS__) : \ + 0) : \ + (((ap)->pcm_capture_ops->callback) ? \ + (ap)->pcm_capture_ops->callback((substream), \ + ##__VA_ARGS__) : \ + 0)) #define PRIVATE_DATA(substream) \ ((struct snd_avirt_private_data *)substream->private_data) @@ -57,9 +67,14 @@ static int pcm_open(struct snd_pcm_substream *substream) struct snd_pcm_hardware *hw; unsigned int chans = 0; + // Find the Audio Path mapped to this device stream = snd_avirt_stream_find_by_device(substream->pcm->device); + if (IS_ERR_VALUE(stream) || !stream) + return PTR_ERR(stream); audiopath = snd_avirt_audiopath_get(stream->map); CHK_NULL_V(audiopath, "Cannot find Audio Path uid: '%s'!", stream->map); + + // Set the private data's Audio Path avirt_private_data = substream->private_data; avirt_private_data->audiopath = audiopath; @@ -67,10 +82,6 @@ static int pcm_open(struct snd_pcm_substream *substream) hw = &substream->runtime->hw; memcpy(hw, audiopath->hw, sizeof(struct snd_pcm_hardware)); - stream = snd_avirt_stream_find_by_device(substream->pcm->device); - if (IS_ERR_VALUE(stream) || !stream) - return PTR_ERR(stream); - // Setup remaining hw properties chans = stream->channels; hw->channels_min = chans; @@ -81,22 +92,6 @@ static int pcm_open(struct snd_pcm_substream *substream) } /** - * pcm_close - Implements 'close' callback for PCM middle layer - * @substream: pointer to ALSA PCM substream - * - * This is called when a PCM substream is closed. - * - * Returns 0 on success or error code otherwise. - */ -static int pcm_close(struct snd_pcm_substream *substream) -{ - // Do additional Audio Path 'close' callback - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - close, substream); -} - -/** * pcm_hw_params - Implements 'hw_params' callback for PCM middle layer * @substream: pointer to ALSA PCM substream * @hw_params: contains the hardware parameters for the PCM @@ -111,23 +106,19 @@ static int pcm_hw_params(struct snd_pcm_substream *substream, { int retval; size_t bufsz; - struct snd_avirt_audiopath *audiopath; - struct snd_avirt_stream *stream; - stream = snd_avirt_stream_find_by_device(substream->pcm->device); - if (IS_ERR_VALUE(stream) || !stream) - return PTR_ERR(stream); - - if ((params_channels(hw_params) > stream->channels) || - (params_channels(hw_params) < stream->channels)) { + /* Check supported channels */ + if ((params_channels(hw_params) < + substream->runtime->hw.channels_min) || + (params_channels(hw_params) > + substream->runtime->hw.channels_max)) { D_ERRORK("Requested number of channels: %d not supported", params_channels(hw_params)); return -EINVAL; } - audiopath = - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath; - bufsz = params_buffer_bytes(hw_params) * audiopath->hw->periods_max; + bufsz = params_buffer_bytes(hw_params) * + substream->runtime->hw.periods_max; retval = snd_pcm_lib_alloc_vmalloc_buffer(substream, bufsz); if (retval < 0) @@ -152,208 +143,19 @@ static int pcm_hw_free(struct snd_pcm_substream *substream) // Do additional Audio Path 'hw_free' callback err = DO_AUDIOPATH_CB( (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - hw_free, substream); + hw_free, substream); return snd_pcm_lib_free_vmalloc_buffer(substream); } /** - * pcm_prepare - Implements 'prepare' callback for PCM middle layer - * @substream: pointer to ALSA PCM substream - * - * The format rate, sample rate, etc., can be set here. This callback can be - * called many times at each setup. This function is also used to handle overrun - * and underrun conditions when we try and resync the DMA (if we're using DMA). - * - * Returns 0 on success or error code otherwise. + * Default PCM ops table. Selected PCM ops must pass through AVIRT before + * calling back to their respective Audio Paths */ -static int pcm_prepare(struct snd_pcm_substream *substream) -{ - - // Do additional Audio Path 'prepare' callback - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - prepare, substream); -} - -/** - * pcm_trigger - Implements 'trigger' callback for PCM middle layer - * @substream: pointer to ALSA PCM substream - * @cmd: action to be performed (start or stop) - * - * This is called when the PCM is started, stopped or paused. The action - * indicated action is specified in the second argument, SNDRV_PCM_TRIGGER_XXX - * - * Returns 0 on success or error code otherwise. - */ -static int pcm_trigger(struct snd_pcm_substream *substream, int cmd) -{ - - switch (cmd) { - case SNDRV_PCM_TRIGGER_START: - case SNDRV_PCM_TRIGGER_RESUME: - case SNDRV_PCM_TRIGGER_STOP: - case SNDRV_PCM_TRIGGER_SUSPEND: - break; - default: - D_ERRORK("Invalid trigger cmd: %d", cmd); - return -EINVAL; - } - - // Do additional Audio Path 'trigger' callback - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - trigger, substream, cmd); -} - -/** - * pcm_pointer - Implements 'pointer' callback for PCM middle layer - * @substream: pointer to ALSA PCM substream - * - * This gets called when the user space needs a DMA buffer index. IO errors will - * be generated if the index does not increment, or drives beyond the frame - * threshold of the buffer itself. - * - * Returns the current hardware buffer frame index. - */ -static snd_pcm_uframes_t pcm_pointer(struct snd_pcm_substream *substream) -{ - // Do additional Audio Path 'pointer' callback - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - pointer, substream); -} - -/** - * pcm_pointer - Implements 'get_time_info' callback for PCM middle layer - * @substream: pointer to ALSA PCM substream - * @system_ts - * @audio_ts - * @audio_tstamp_config - * @audio_tstamp_report - * - * Generic way to get system timestamp and audio timestamp info - * - * Returns 0 on success or error code otherwise - */ -static int -pcm_get_time_info(struct snd_pcm_substream *substream, - struct timespec *system_ts, struct timespec *audio_ts, - struct snd_pcm_audio_tstamp_config *audio_tstamp_config, - struct snd_pcm_audio_tstamp_report *audio_tstamp_report) -{ - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - get_time_info, substream, system_ts, audio_ts, - audio_tstamp_config, audio_tstamp_report); -} - -/** - * pcm_copy_user - Implements 'copy_user' callback for PCM middle layer - * @substream: pointer to ALSA PCM substream - * @channel: - * @pos: The offset in the DMA - * @src: Audio PCM data from the user space - * @count: - * - * This is where we need to copy user audio PCM data into the sound driver - * - * Returns 0 on success or error code otherwise. - * - */ -static int pcm_copy_user(struct snd_pcm_substream *substream, int channel, - snd_pcm_uframes_t pos, void __user *src, - snd_pcm_uframes_t count) -{ - - // struct snd_pcm_runtime *runtime; - // int offset; - - // runtime = substream->runtime; - // offset = frames_to_bytes(runtime, pos); - - // Do additional Audio Path 'copy_user' callback - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - copy_user, substream, channel, pos, src, count); -} - -/** - * pcm_copy_kernel - Implements 'copy_kernel' callback for PCM middle layer - * @substream: pointer to ALSA PCM substream - * @channel: - * @pos: The offset in the DMA - * @src: Audio PCM data from the user space - * @count: - * - * This is where we need to copy kernel audio PCM data into the sound driver - * - * Returns 0 on success or error code otherwise. - * - */ -static int pcm_copy_kernel(struct snd_pcm_substream *substream, int channel, - unsigned long pos, void *buf, unsigned long count) -{ - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - copy_kernel, substream, channel, pos, buf, count); -} - -/** - * pcm_ack - Implements 'ack' callback for PCM middle layer - * @substream: pointer to ALSA PCM substream - * - * This is where we need to ack - * - * Returns 0 on success or error code otherwise. - * - */ -static int pcm_ack(struct snd_pcm_substream *substream) -{ - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - ack, substream); -} - -static int pcm_silence(struct snd_pcm_substream *substream, int channel, - snd_pcm_uframes_t pos, snd_pcm_uframes_t count) -{ - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - fill_silence, substream, channel, pos, count); -} - -/** - * pcm_mmap - Implements 'mmap' callback for PCM middle layer - * @substream: pointer to ALSA PCM substream - * - * This is where we need to ack - * - * Returns 0 on success or error code otherwise. - * - */ -static int pcm_mmap(struct snd_pcm_substream *substream, - struct vm_area_struct *vma) -{ - return DO_AUDIOPATH_CB( - (struct snd_avirt_audiopath *)PRIVATE_DATA(substream)->audiopath, - mmap, substream, vma); -} - -struct snd_pcm_ops pcm_ops = { +struct snd_pcm_ops pcm_ops_avirt = { .open = pcm_open, - .close = pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = pcm_hw_params, .hw_free = pcm_hw_free, - .prepare = pcm_prepare, - .trigger = pcm_trigger, - .pointer = pcm_pointer, - .get_time_info = pcm_get_time_info, - .fill_silence = pcm_silence, - .copy_user = pcm_copy_user, - .copy_kernel = pcm_copy_kernel, .page = snd_pcm_lib_get_vmalloc_page, - .ack = pcm_ack, - .mmap = pcm_mmap, }; |