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Quellcodebibliothek Statistik Leitseite products/Sources/formale Sprachen/C/Linux/arch/arm/boot/dts/microchip/   (Linux Kernel Version 6.17.9©)  Datei vom 24.10.2025 mit Größe 392 B image not shown  

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pcsp.h


products/Sources/formale Sprachen/C/Linux/sound/drivers/pcsp/pcsp.h

/* SPDX-License-Identifier: GPL-2.0 */ /* * PC-Speaker driver for Linux * * Copyright (C) 1993-1997 Michael Beck * Copyright (C) 1997-2001 David Woodhouse * Copyright (C) 2001-2008 Stas Sergeev */ #ifndef __PCSP_H__ #define __PCSP_H__ #include #include #include #define PCSP_SOUND_VERSION 0x400 /* read 4.00 */ #define PCSP_DEBUG 0 /* default timer freq for PC-Speaker: 18643 Hz */ #define DIV_18KHZ 64 #define MAX_DIV DIV_18KHZ #define CALC_DIV(d) (MAX_DIV >> (d)) #define CUR_DIV() CALC_DIV(chip->treble) #define PCSP_MAX_TREBLE 1 /* unfortunately, with hrtimers 37KHz does not work very well :( */ #define PCSP_DEFAULT_TREBLE 0 #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE) /* wild guess */ #define PCSP_MIN_LPJ 1000000 #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1) #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV) #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble)) #define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i)) #define PCSP_RATE() PCSP_CALC_RATE(chip->treble) #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1) #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1) #define PCSP_CALC_NS(div) ({ \ u64 __val = 1000000000ULL * (div); \ do_div(__val, PIT_TICK_RATE); \ __val; \ }) #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV()) #define PCSP_MAX_PERIOD_SIZE (64*1024) #define PCSP_MAX_PERIODS 512 #define PCSP_BUFFER_SIZE (128*1024) struct snd_pcsp { struct snd_card *card; struct snd_pcm *pcm; struct input_dev *input_dev; struct hrtimer timer; unsigned short port, irq, dma; spinlock_t substream_lock; struct snd_pcm_substream *playback_substream; unsigned int fmt_size; unsigned int is_signed; size_t playback_ptr; size_t period_ptr; atomic_t timer_active; int thalf; u64 ns_rem; unsigned char val61; int enable; int max_treble; int treble; int pcspkr; }; extern struct snd_pcsp pcsp_chip; extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle); extern void pcsp_sync_stop(struct snd_pcsp *chip); extern int snd_pcsp_new_pcm(struct snd_pcsp *chip); extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm); #endif

                                                                                                                                                                                                                                                                                                                                                                                                     

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