162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * PC-Speaker driver for Linux 462306a36Sopenharmony_ci * 562306a36Sopenharmony_ci * Copyright (C) 1993-1997 Michael Beck 662306a36Sopenharmony_ci * Copyright (C) 1997-2001 David Woodhouse 762306a36Sopenharmony_ci * Copyright (C) 2001-2008 Stas Sergeev 862306a36Sopenharmony_ci */ 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci#ifndef __PCSP_H__ 1162306a36Sopenharmony_ci#define __PCSP_H__ 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci#include <linux/hrtimer.h> 1462306a36Sopenharmony_ci#include <linux/i8253.h> 1562306a36Sopenharmony_ci#include <linux/timex.h> 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_ci#define PCSP_SOUND_VERSION 0x400 /* read 4.00 */ 1862306a36Sopenharmony_ci#define PCSP_DEBUG 0 1962306a36Sopenharmony_ci 2062306a36Sopenharmony_ci/* default timer freq for PC-Speaker: 18643 Hz */ 2162306a36Sopenharmony_ci#define DIV_18KHZ 64 2262306a36Sopenharmony_ci#define MAX_DIV DIV_18KHZ 2362306a36Sopenharmony_ci#define CALC_DIV(d) (MAX_DIV >> (d)) 2462306a36Sopenharmony_ci#define CUR_DIV() CALC_DIV(chip->treble) 2562306a36Sopenharmony_ci#define PCSP_MAX_TREBLE 1 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ci/* unfortunately, with hrtimers 37KHz does not work very well :( */ 2862306a36Sopenharmony_ci#define PCSP_DEFAULT_TREBLE 0 2962306a36Sopenharmony_ci#define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE) 3062306a36Sopenharmony_ci 3162306a36Sopenharmony_ci/* wild guess */ 3262306a36Sopenharmony_ci#define PCSP_MIN_LPJ 1000000 3362306a36Sopenharmony_ci#define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1) 3462306a36Sopenharmony_ci#define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV) 3562306a36Sopenharmony_ci#define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble)) 3662306a36Sopenharmony_ci#define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i)) 3762306a36Sopenharmony_ci#define PCSP_RATE() PCSP_CALC_RATE(chip->treble) 3862306a36Sopenharmony_ci#define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE 3962306a36Sopenharmony_ci#define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE 4062306a36Sopenharmony_ci#define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1) 4162306a36Sopenharmony_ci#define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1) 4262306a36Sopenharmony_ci#define PCSP_CALC_NS(div) ({ \ 4362306a36Sopenharmony_ci u64 __val = 1000000000ULL * (div); \ 4462306a36Sopenharmony_ci do_div(__val, PIT_TICK_RATE); \ 4562306a36Sopenharmony_ci __val; \ 4662306a36Sopenharmony_ci}) 4762306a36Sopenharmony_ci#define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV()) 4862306a36Sopenharmony_ci 4962306a36Sopenharmony_ci#define PCSP_MAX_PERIOD_SIZE (64*1024) 5062306a36Sopenharmony_ci#define PCSP_MAX_PERIODS 512 5162306a36Sopenharmony_ci#define PCSP_BUFFER_SIZE (128*1024) 5262306a36Sopenharmony_ci 5362306a36Sopenharmony_cistruct snd_pcsp { 5462306a36Sopenharmony_ci struct snd_card *card; 5562306a36Sopenharmony_ci struct snd_pcm *pcm; 5662306a36Sopenharmony_ci struct input_dev *input_dev; 5762306a36Sopenharmony_ci struct hrtimer timer; 5862306a36Sopenharmony_ci unsigned short port, irq, dma; 5962306a36Sopenharmony_ci spinlock_t substream_lock; 6062306a36Sopenharmony_ci struct snd_pcm_substream *playback_substream; 6162306a36Sopenharmony_ci unsigned int fmt_size; 6262306a36Sopenharmony_ci unsigned int is_signed; 6362306a36Sopenharmony_ci size_t playback_ptr; 6462306a36Sopenharmony_ci size_t period_ptr; 6562306a36Sopenharmony_ci atomic_t timer_active; 6662306a36Sopenharmony_ci int thalf; 6762306a36Sopenharmony_ci u64 ns_rem; 6862306a36Sopenharmony_ci unsigned char val61; 6962306a36Sopenharmony_ci int enable; 7062306a36Sopenharmony_ci int max_treble; 7162306a36Sopenharmony_ci int treble; 7262306a36Sopenharmony_ci int pcspkr; 7362306a36Sopenharmony_ci}; 7462306a36Sopenharmony_ci 7562306a36Sopenharmony_ciextern struct snd_pcsp pcsp_chip; 7662306a36Sopenharmony_ci 7762306a36Sopenharmony_ciextern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle); 7862306a36Sopenharmony_ciextern void pcsp_sync_stop(struct snd_pcsp *chip); 7962306a36Sopenharmony_ci 8062306a36Sopenharmony_ciextern int snd_pcsp_new_pcm(struct snd_pcsp *chip); 8162306a36Sopenharmony_ciextern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm); 8262306a36Sopenharmony_ci 8362306a36Sopenharmony_ci#endif 84