From 9ab4d072ad67793d70b8707e14fb9261749c4e07 Mon Sep 17 00:00:00 2001 From: Stas Sergeev Date: Mon, 3 Mar 2008 10:53:54 +0100 Subject: [ALSA] Add PC-speaker sound driver Added PC-speaker sound driver (snd-pcsp). Signed-off-by: Stas Sergeev Signed-off-by: Takashi Iwai --- sound/drivers/pcsp/pcsp.h | 82 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 sound/drivers/pcsp/pcsp.h (limited to 'sound/drivers/pcsp/pcsp.h') diff --git a/sound/drivers/pcsp/pcsp.h b/sound/drivers/pcsp/pcsp.h new file mode 100644 index 00000000000..f07cc1ee1fe --- /dev/null +++ b/sound/drivers/pcsp/pcsp.h @@ -0,0 +1,82 @@ +/* + * 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 +#if defined(CONFIG_MIPS) || defined(CONFIG_X86) +/* Use the global PIT lock ! */ +#include +#else +#include +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 CUR_DIV() (MAX_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_RATE() (PIT_TICK_RATE / CUR_DIV()) +#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; + 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 int snd_pcsp_new_pcm(struct snd_pcsp *chip); +extern int snd_pcsp_new_mixer(struct snd_pcsp *chip); + +#endif -- cgit v1.2.3