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TOMOYO Linux Cross Reference
Linux/sound/drivers/pcsp/pcsp.h

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  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>
 13 #include <linux/i8253.h>
 14 #include <linux/timex.h>
 15 
 16 #define PCSP_SOUND_VERSION 0x400        /* read 4.00 */
 17 #define PCSP_DEBUG 0
 18 
 19 /* default timer freq for PC-Speaker: 18643 Hz */
 20 #define DIV_18KHZ 64
 21 #define MAX_DIV DIV_18KHZ
 22 #define CALC_DIV(d) (MAX_DIV >> (d))
 23 #define CUR_DIV() CALC_DIV(chip->treble)
 24 #define PCSP_MAX_TREBLE 1
 25 
 26 /* unfortunately, with hrtimers 37KHz does not work very well :( */
 27 #define PCSP_DEFAULT_TREBLE 0
 28 #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE)
 29 
 30 /* wild guess */
 31 #define PCSP_MIN_LPJ 1000000
 32 #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1)
 33 #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV)
 34 #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble))
 35 #define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i))
 36 #define PCSP_RATE() PCSP_CALC_RATE(chip->treble)
 37 #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE
 38 #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE
 39 #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1)
 40 #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1)
 41 #define PCSP_CALC_NS(div) ({ \
 42         u64 __val = 1000000000ULL * (div); \
 43         do_div(__val, PIT_TICK_RATE); \
 44         __val; \
 45 })
 46 #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV())
 47 
 48 #define PCSP_MAX_PERIOD_SIZE    (64*1024)
 49 #define PCSP_MAX_PERIODS        512
 50 #define PCSP_BUFFER_SIZE        (128*1024)
 51 
 52 struct snd_pcsp {
 53         struct snd_card *card;
 54         struct snd_pcm *pcm;
 55         struct input_dev *input_dev;
 56         struct hrtimer timer;
 57         unsigned short port, irq, dma;
 58         spinlock_t substream_lock;
 59         struct snd_pcm_substream *playback_substream;
 60         unsigned int fmt_size;
 61         unsigned int is_signed;
 62         size_t playback_ptr;
 63         size_t period_ptr;
 64         atomic_t timer_active;
 65         int thalf;
 66         u64 ns_rem;
 67         unsigned char val61;
 68         int enable;
 69         int max_treble;
 70         int treble;
 71         int pcspkr;
 72 };
 73 
 74 extern struct snd_pcsp pcsp_chip;
 75 
 76 extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
 77 extern void pcsp_sync_stop(struct snd_pcsp *chip);
 78 
 79 extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
 80 extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm);
 81 
 82 #endif
 83 

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