blob: 6757c304ee461fd6713d19c654e6e71f5a2b8683 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
/*
* 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/timex.h>
#if defined(CONFIG_MIPS) || defined(CONFIG_X86)
/* Use the global PIT lock ! */
#include <linux/i8253.h>
#else
#include <asm/8253pit.h>
static DEFINE_RAW_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 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
|
