| /* |
| * PC-Speaker driver for Linux |
| * |
| * Copyright (C) 1993-1997 Michael Beck |
| * Copyright (C) 1997-2001 David Woodhouse |
| * Copyright (C) 2001-2008 Stas Sergeev |
| */ |
| |
| #ifndef __PCSP_H__ |
| #define __PCSP_H__ |
| |
| #include <linux/hrtimer.h> |
| #if defined(CONFIG_MIPS) || defined(CONFIG_X86) |
| /* Use the global PIT lock ! */ |
| #include <asm/i8253.h> |
| #else |
| #include <asm/8253pit.h> |
| static DEFINE_SPINLOCK(i8253_lock); |
| #endif |
| |
| #define PCSP_SOUND_VERSION 0x400 /* read 4.00 */ |
| #define PCSP_DEBUG 0 |
| |
| /* default timer freq for PC-Speaker: 18643 Hz */ |
| #define DIV_18KHZ 64 |
| #define MAX_DIV DIV_18KHZ |
| #define CALC_DIV(d) (MAX_DIV >> (d)) |
| #define CUR_DIV() CALC_DIV(chip->treble) |
| #define PCSP_MAX_TREBLE 1 |
| |
| /* unfortunately, with hrtimers 37KHz does not work very well :( */ |
| #define PCSP_DEFAULT_TREBLE 0 |
| #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE) |
| |
| /* wild guess */ |
| #define PCSP_MIN_LPJ 1000000 |
| #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1) |
| #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV) |
| #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble)) |
| #define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i)) |
| #define PCSP_RATE() PCSP_CALC_RATE(chip->treble) |
| #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE |
| #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE |
| #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1) |
| #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1) |
| #define PCSP_CALC_NS(div) ({ \ |
| u64 __val = 1000000000ULL * (div); \ |
| do_div(__val, PIT_TICK_RATE); \ |
| __val; \ |
| }) |
| #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV()) |
| |
| #define PCSP_MAX_PERIOD_SIZE (64*1024) |
| #define PCSP_MAX_PERIODS 512 |
| #define PCSP_BUFFER_SIZE (128*1024) |
| |
| struct snd_pcsp { |
| struct snd_card *card; |
| struct snd_pcm *pcm; |
| struct input_dev *input_dev; |
| struct hrtimer timer; |
| unsigned short port, irq, dma; |
| spinlock_t substream_lock; |
| struct snd_pcm_substream *playback_substream; |
| unsigned int fmt_size; |
| unsigned int is_signed; |
| size_t playback_ptr; |
| size_t period_ptr; |
| atomic_t timer_active; |
| int thalf; |
| u64 ns_rem; |
| unsigned char val61; |
| int enable; |
| int max_treble; |
| int treble; |
| int pcspkr; |
| }; |
| |
| extern struct snd_pcsp pcsp_chip; |
| |
| extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle); |
| extern void pcsp_sync_stop(struct snd_pcsp *chip); |
| |
| extern int snd_pcsp_new_pcm(struct snd_pcsp *chip); |
| extern int snd_pcsp_new_mixer(struct snd_pcsp *chip); |
| |
| #endif |