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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/sound/drivers/pcsp/pcsp.h
10817 views
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/*

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 * PC-Speaker driver for Linux

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 *

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 * Copyright (C) 1993-1997  Michael Beck

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 * Copyright (C) 1997-2001  David Woodhouse

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 * Copyright (C) 2001-2008  Stas Sergeev

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 */

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#ifndef __PCSP_H__

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#define __PCSP_H__

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#include <linux/hrtimer.h>

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#include <linux/timex.h>

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#if defined(CONFIG_MIPS) || defined(CONFIG_X86)

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/* Use the global PIT lock ! */

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#include <asm/i8253.h>

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#else

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#include <asm/8253pit.h>

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static DEFINE_RAW_SPINLOCK(i8253_lock);

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#endif

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#define PCSP_SOUND_VERSION 0x400	/* read 4.00 */

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#define PCSP_DEBUG 0

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/* default timer freq for PC-Speaker: 18643 Hz */

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#define DIV_18KHZ 64

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#define MAX_DIV DIV_18KHZ

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#define CALC_DIV(d) (MAX_DIV >> (d))

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#define CUR_DIV() CALC_DIV(chip->treble)

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#define PCSP_MAX_TREBLE 1

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/* unfortunately, with hrtimers 37KHz does not work very well :( */

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#define PCSP_DEFAULT_TREBLE 0

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#define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE)

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/* wild guess */

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#define PCSP_MIN_LPJ 1000000

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#define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1)

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#define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV)

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#define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble))

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#define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i))

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#define PCSP_RATE() PCSP_CALC_RATE(chip->treble)

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#define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE

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#define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE

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#define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1)

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#define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1)

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#define PCSP_CALC_NS(div) ({ \

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	u64 __val = 1000000000ULL * (div); \

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	do_div(__val, PIT_TICK_RATE); \

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	__val; \

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})

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#define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV())

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#define PCSP_MAX_PERIOD_SIZE	(64*1024)

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#define PCSP_MAX_PERIODS	512

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#define PCSP_BUFFER_SIZE	(128*1024)

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struct snd_pcsp {

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	struct snd_card *card;

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	struct snd_pcm *pcm;

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	struct input_dev *input_dev;

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	struct hrtimer timer;

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	unsigned short port, irq, dma;

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	spinlock_t substream_lock;

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	struct snd_pcm_substream *playback_substream;

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	unsigned int fmt_size;

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	unsigned int is_signed;

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	size_t playback_ptr;

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	size_t period_ptr;

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	atomic_t timer_active;

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	int thalf;

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	u64 ns_rem;

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	unsigned char val61;

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	int enable;

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	int max_treble;

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	int treble;

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	int pcspkr;

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};

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extern struct snd_pcsp pcsp_chip;

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extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);

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extern void pcsp_sync_stop(struct snd_pcsp *chip);

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extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);

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extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm);

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#endif

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