diff options
Diffstat (limited to 'sound/drivers/pcm-indirect2.h')
| -rw-r--r-- | sound/drivers/pcm-indirect2.h | 127 |
1 files changed, 0 insertions, 127 deletions
diff --git a/sound/drivers/pcm-indirect2.h b/sound/drivers/pcm-indirect2.h deleted file mode 100644 index 355ce76d2403..000000000000 --- a/sound/drivers/pcm-indirect2.h +++ /dev/null @@ -1,127 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * Helper functions for indirect PCM data transfer to a simple FIFO in - * hardware (small, no possibility to read "hardware io position", - * updating position done by interrupt, ...) - * - * Copyright (c) by 2007 Joachim Foerster <JOFT@gmx.de> - * - * Based on "pcm-indirect.h" (alsa-driver-1.0.13) by - * - * Copyright (c) by Takashi Iwai <tiwai@suse.de> - * Jaroslav Kysela <perex@suse.cz> - */ - -#ifndef __SOUND_PCM_INDIRECT2_H -#define __SOUND_PCM_INDIRECT2_H - -/* struct snd_pcm_substream, struct snd_pcm_runtime, snd_pcm_uframes_t */ -#include <sound/pcm.h> - -/* Debug options for code which may be removed completely in a final version */ -#ifdef CONFIG_SND_DEBUG -#define SND_PCM_INDIRECT2_STAT /* turn on some "statistics" about the - * process of copying bytes from the - * intermediate buffer to the hardware - * fifo and the other way round - */ -#endif - -struct snd_pcm_indirect2 { - unsigned int hw_buffer_size; /* Byte size of hardware buffer */ - int hw_ready; /* playback: 1 = hw fifo has room left, - * 0 = hw fifo is full - */ - unsigned int min_multiple; - int min_periods; /* counts number of min. periods until - * min_multiple is reached - */ - int min_period_count; /* counts bytes to count number of - * min. periods - */ - - unsigned int sw_buffer_size; /* Byte size of software buffer */ - - /* sw_data: position in intermediate buffer, where we will read (or - * write) from/to next time (to transfer data to/from HW) - */ - unsigned int sw_data; /* Offset to next dst (or src) in sw - * ring buffer - */ - /* easiest case (playback): - * sw_data is nearly the same as ~ runtime->control->appl_ptr, with the - * exception that sw_data is "behind" by the number if bytes ALSA wrote - * to the intermediate buffer last time. - * A call to ack() callback synchronizes both indirectly. - */ - - /* We have no real sw_io pointer here. Usually sw_io is pointing to the - * current playback/capture position _inside_ the hardware. Devices - * with plain FIFOs often have no possibility to publish this position. - * So we say: if sw_data is updated, that means bytes were copied to - * the hardware, we increase sw_io by that amount, because there have - * to be as much bytes which were played. So sw_io will stay behind - * sw_data all the time and has to converge to sw_data at the end of - * playback. - */ - unsigned int sw_io; /* Current software pointer in bytes */ - - /* sw_ready: number of bytes ALSA copied to the intermediate buffer, so - * it represents the number of bytes which wait for transfer to the HW - */ - int sw_ready; /* Bytes ready to be transferred to/from hw */ - - /* appl_ptr: last known position of ALSA (where ALSA is going to write - * next time into the intermediate buffer - */ - snd_pcm_uframes_t appl_ptr; /* Last seen appl_ptr */ - - unsigned int bytes2hw; - int check_alignment; - -#ifdef SND_PCM_INDIRECT2_STAT - unsigned int zeros2hw; - unsigned int mul_elapsed; - unsigned int mul_elapsed_real; - unsigned long firstbytetime; - unsigned long lastbytetime; - unsigned long firstzerotime; - unsigned int byte_sizes[64]; - unsigned int zero_sizes[64]; - unsigned int min_adds[8]; - unsigned int mul_adds[8]; - unsigned int zero_times[3750]; /* = 15s */ - unsigned int zero_times_saved; - unsigned int zero_times_notsaved; - unsigned int irq_occured; - unsigned int pointer_calls; - unsigned int lastdifftime; -#endif -}; - -typedef size_t (*snd_pcm_indirect2_copy_t) (struct snd_pcm_substream *substream, - struct snd_pcm_indirect2 *rec, - size_t bytes); -typedef size_t (*snd_pcm_indirect2_zero_t) (struct snd_pcm_substream *substream, - struct snd_pcm_indirect2 *rec); - -#ifdef SND_PCM_INDIRECT2_STAT -void snd_pcm_indirect2_stat(struct snd_pcm_substream *substream, - struct snd_pcm_indirect2 *rec); -#endif - -snd_pcm_uframes_t -snd_pcm_indirect2_pointer(struct snd_pcm_substream *substream, - struct snd_pcm_indirect2 *rec); -void -snd_pcm_indirect2_playback_interrupt(struct snd_pcm_substream *substream, - struct snd_pcm_indirect2 *rec, - snd_pcm_indirect2_copy_t copy, - snd_pcm_indirect2_zero_t zero); -void -snd_pcm_indirect2_capture_interrupt(struct snd_pcm_substream *substream, - struct snd_pcm_indirect2 *rec, - snd_pcm_indirect2_copy_t copy, - snd_pcm_indirect2_zero_t null); - -#endif /* __SOUND_PCM_INDIRECT2_H */ |