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