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83 lines
2.2 KiB
83 lines
2.2 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* PC-Speaker driver for Linux |
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* |
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* Copyright (C) 1993-1997 Michael Beck |
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* Copyright (C) 1997-2001 David Woodhouse |
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* Copyright (C) 2001-2008 Stas Sergeev |
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*/ |
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#ifndef __PCSP_H__ |
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#define __PCSP_H__ |
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#include <linux/hrtimer.h> |
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#include <linux/i8253.h> |
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#include <linux/timex.h> |
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#define PCSP_SOUND_VERSION 0x400 /* read 4.00 */ |
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#define PCSP_DEBUG 0 |
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/* default timer freq for PC-Speaker: 18643 Hz */ |
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#define DIV_18KHZ 64 |
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#define MAX_DIV DIV_18KHZ |
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#define CALC_DIV(d) (MAX_DIV >> (d)) |
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#define CUR_DIV() CALC_DIV(chip->treble) |
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#define PCSP_MAX_TREBLE 1 |
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/* unfortunately, with hrtimers 37KHz does not work very well :( */ |
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#define PCSP_DEFAULT_TREBLE 0 |
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#define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE) |
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/* wild guess */ |
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#define PCSP_MIN_LPJ 1000000 |
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#define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1) |
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#define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV) |
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#define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble)) |
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#define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i)) |
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#define PCSP_RATE() PCSP_CALC_RATE(chip->treble) |
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#define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE |
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#define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE |
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#define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1) |
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#define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1) |
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#define PCSP_CALC_NS(div) ({ \ |
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u64 __val = 1000000000ULL * (div); \ |
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do_div(__val, PIT_TICK_RATE); \ |
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__val; \ |
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}) |
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#define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV()) |
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#define PCSP_MAX_PERIOD_SIZE (64*1024) |
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#define PCSP_MAX_PERIODS 512 |
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#define PCSP_BUFFER_SIZE (128*1024) |
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struct snd_pcsp { |
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struct snd_card *card; |
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struct snd_pcm *pcm; |
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struct input_dev *input_dev; |
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struct hrtimer timer; |
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unsigned short port, irq, dma; |
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spinlock_t substream_lock; |
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struct snd_pcm_substream *playback_substream; |
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unsigned int fmt_size; |
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unsigned int is_signed; |
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size_t playback_ptr; |
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size_t period_ptr; |
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atomic_t timer_active; |
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int thalf; |
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u64 ns_rem; |
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unsigned char val61; |
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int enable; |
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int max_treble; |
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int treble; |
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int pcspkr; |
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}; |
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extern struct snd_pcsp pcsp_chip; |
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extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle); |
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extern void pcsp_sync_stop(struct snd_pcsp *chip); |
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extern int snd_pcsp_new_pcm(struct snd_pcsp *chip); |
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extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm); |
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#endif
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