1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * PC-Speaker driver for Linux 4 * 5 * Copyright (C) 1993-1997 Michael Beck 6 * Copyright (C) 1997-2001 David Woodhouse 7 * Copyright (C) 2001-2008 Stas Sergeev 8 */ 9 10 #ifndef __PCSP_H__ 11 #define __PCSP_H__ 12 13 #include <linux/hrtimer.h> 14 #include <linux/i8253.h> 15 #include <linux/timex.h> 16 17 #define PCSP_SOUND_VERSION 0x400 /* read 4.00 */ 18 #define PCSP_DEBUG 0 19 20 /* default timer freq for PC-Speaker: 18643 Hz */ 21 #define DIV_18KHZ 64 22 #define MAX_DIV DIV_18KHZ 23 #define CALC_DIV(d) (MAX_DIV >> (d)) 24 #define CUR_DIV() CALC_DIV(chip->treble) 25 #define PCSP_MAX_TREBLE 1 26 27 /* unfortunately, with hrtimers 37KHz does not work very well :( */ 28 #define PCSP_DEFAULT_TREBLE 0 29 #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE) 30 31 /* wild guess */ 32 #define PCSP_MIN_LPJ 1000000 33 #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1) 34 #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV) 35 #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble)) 36 #define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i)) 37 #define PCSP_RATE() PCSP_CALC_RATE(chip->treble) 38 #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE 39 #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE 40 #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1) 41 #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1) 42 #define PCSP_CALC_NS(div) ({ \ 43 u64 __val = 1000000000ULL * (div); \ 44 do_div(__val, PIT_TICK_RATE); \ 45 __val; \ 46 }) 47 #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV()) 48 49 #define PCSP_MAX_PERIOD_SIZE (64*1024) 50 #define PCSP_MAX_PERIODS 512 51 #define PCSP_BUFFER_SIZE (128*1024) 52 53 struct snd_pcsp { 54 struct snd_card *card; 55 struct snd_pcm *pcm; 56 struct input_dev *input_dev; 57 struct hrtimer timer; 58 unsigned short port, irq, dma; 59 spinlock_t substream_lock; 60 struct snd_pcm_substream *playback_substream; 61 unsigned int fmt_size; 62 unsigned int is_signed; 63 size_t playback_ptr; 64 size_t period_ptr; 65 atomic_t timer_active; 66 int thalf; 67 u64 ns_rem; 68 unsigned char val61; 69 int enable; 70 int max_treble; 71 int treble; 72 int pcspkr; 73 }; 74 75 extern struct snd_pcsp pcsp_chip; 76 77 extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle); 78 extern void pcsp_sync_stop(struct snd_pcsp *chip); 79 80 extern int snd_pcsp_new_pcm(struct snd_pcsp *chip); 81 extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm); 82 83 #endif 84