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
52struct 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
74extern struct snd_pcsp pcsp_chip;
75
76extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle);
77extern void pcsp_sync_stop(struct snd_pcsp *chip);
78
79extern int snd_pcsp_new_pcm(struct snd_pcsp *chip);
80extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm);
81
82#endif
83