sound/drivers/pcsp/pcsp.h

   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