forked from Minki/linux
8e1b5adfbe
Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Cc: Jaroslav Kysela <perex@perex.cz> Acked-by: Takashi Iwai <tiwai@suse.de> Cc: alsa-devel@alsa-project.org Link: http://lkml.kernel.org/r/20110601180610.532642190@duck.linux-mips.net Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
83 lines
2.2 KiB
C
83 lines
2.2 KiB
C
/*
|
|
* 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
|