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