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- /*
- * 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>
- #include <linux/i8253.h>
- #include <linux/timex.h>
- #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, int nopcm);
- #endif
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