[linux-2.6-block.git] / sound / drivers / pcsp / pcsp.h

/*
 * 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/timex.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, int nopcm);

#endif
Commit	Line	Data
9ab4d072 SS	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>
08604bd9	13	#include <linux/timex.h>
9ab4d072 SS	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
97e08f5d SS	28	#define CALC_DIV(d) (MAX_DIV >> (d))
97e08f5d SS	29	#define CUR_DIV() CALC_DIV(chip->treble)
9ab4d072 SS	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))
97e08f5d SS	41	#define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i))
97e08f5d SS	42	#define PCSP_RATE() PCSP_CALC_RATE(chip->treble)
9ab4d072 SS	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;
eea0579f TI	66	unsigned int fmt_size;
eea0579f TI	67	unsigned int is_signed;
9ab4d072 SS	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);
96c7d478	83	extern void pcsp_sync_stop(struct snd_pcsp *chip);
9ab4d072 SS	84
9ab4d072 SS	85	extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
bcc2c6b7	86	extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm);
9ab4d072 SS	87
9ab4d072 SS	88	#endif