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/timex.h> 14 #if defined(CONFIG_MIPS) || defined(CONFIG_X86) 15 /* Use the global PIT lock ! */ 16 #include <asm/i8253.h> 17 #else 18 #include <asm/8253pit.h> 19 static DEFINE_SPINLOCK(i8253_lock); 20 #endif 21 22 #define PCSP_SOUND_VERSION 0x400 /* read 4.00 */ 23 #define PCSP_DEBUG 0 24 25 /* default timer freq for PC-Speaker: 18643 Hz */ 26 #define DIV_18KHZ 64 27 #define MAX_DIV DIV_18KHZ 28 #define CALC_DIV(d) (MAX_DIV >> (d)) 29 #define CUR_DIV() CALC_DIV(chip->treble) 30 #define PCSP_MAX_TREBLE 1 31 32 /* unfortunately, with hrtimers 37KHz does not work very well :( */ 33 #define PCSP_DEFAULT_TREBLE 0 34 #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE) 35 36 /* wild guess */ 37 #define PCSP_MIN_LPJ 1000000 38 #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1) 39 #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV) 40 #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble)) 41 #define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i)) 42 #define PCSP_RATE() PCSP_CALC_RATE(chip->treble) 43 #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE 44 #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE 45 #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1) 46 #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1) 47 #define PCSP_CALC_NS(div) ({ \ 48 u64 __val = 1000000000ULL * (div); \ 49 do_div(__val, PIT_TICK_RATE); \ 50 __val; \ 51 }) 52 #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV()) 53 54 #define PCSP_MAX_PERIOD_SIZE (64*1024) 55 #define PCSP_MAX_PERIODS 512 56 #define PCSP_BUFFER_SIZE (128*1024) 57 58 struct snd_pcsp { 59 struct snd_card *card; 60 struct snd_pcm *pcm; 61 struct input_dev *input_dev; 62 struct hrtimer timer; 63 unsigned short port, irq, dma; 64 spinlock_t substream_lock; 65 struct snd_pcm_substream *playback_substream; 66 unsigned int fmt_size; 67 unsigned int is_signed; 68 size_t playback_ptr; 69 size_t period_ptr; 70 atomic_t timer_active; 71 int thalf; 72 u64 ns_rem; 73 unsigned char val61; 74 int enable; 75 int max_treble; 76 int treble; 77 int pcspkr; 78 }; 79 80 extern struct snd_pcsp pcsp_chip; 81 82 extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle); 83 extern void pcsp_sync_stop(struct snd_pcsp *chip); 84 85 extern int snd_pcsp_new_pcm(struct snd_pcsp *chip); 86 extern int snd_pcsp_new_mixer(struct snd_pcsp *chip); 87 88 #endif 89