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9ab4d072 SS |
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> | |
08604bd9 | 13 | #include <linux/timex.h> |
9ab4d072 SS |
14 | #if defined(CONFIG_MIPS) || defined(CONFIG_X86) |
15 | /* Use the global PIT lock ! */ | |
16 | #include <asm/i8253.h> | |
17 | #else | |
18 | #include <asm/8253pit.h> | |
ced918eb | 19 | static DEFINE_RAW_SPINLOCK(i8253_lock); |
9ab4d072 SS |
20 | #endif |
21 | ||
22 | #define PCSP_SOUND_VERSION 0x400 /* read 4.00 */ | |
23 | #define PCSP_DEBUG 0 | |
24 | ||
25 | /* default timer freq for PC-Speaker: 18643 Hz */ | |
26 | #define DIV_18KHZ 64 | |
27 | #define MAX_DIV DIV_18KHZ | |
97e08f5d SS |
28 | #define CALC_DIV(d) (MAX_DIV >> (d)) |
29 | #define CUR_DIV() CALC_DIV(chip->treble) | |
9ab4d072 SS |
30 | #define PCSP_MAX_TREBLE 1 |
31 | ||
32 | /* unfortunately, with hrtimers 37KHz does not work very well :( */ | |
33 | #define PCSP_DEFAULT_TREBLE 0 | |
34 | #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE) | |
35 | ||
36 | /* wild guess */ | |
37 | #define PCSP_MIN_LPJ 1000000 | |
38 | #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1) | |
39 | #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV) | |
40 | #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble)) | |
97e08f5d SS |
41 | #define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i)) |
42 | #define PCSP_RATE() PCSP_CALC_RATE(chip->treble) | |
9ab4d072 SS |
43 | #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE |
44 | #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE | |
45 | #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1) | |
46 | #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1) | |
47 | #define PCSP_CALC_NS(div) ({ \ | |
48 | u64 __val = 1000000000ULL * (div); \ | |
49 | do_div(__val, PIT_TICK_RATE); \ | |
50 | __val; \ | |
51 | }) | |
52 | #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV()) | |
53 | ||
54 | #define PCSP_MAX_PERIOD_SIZE (64*1024) | |
55 | #define PCSP_MAX_PERIODS 512 | |
56 | #define PCSP_BUFFER_SIZE (128*1024) | |
57 | ||
58 | struct snd_pcsp { | |
59 | struct snd_card *card; | |
60 | struct snd_pcm *pcm; | |
61 | struct input_dev *input_dev; | |
62 | struct hrtimer timer; | |
63 | unsigned short port, irq, dma; | |
64 | spinlock_t substream_lock; | |
65 | struct snd_pcm_substream *playback_substream; | |
eea0579f TI |
66 | unsigned int fmt_size; |
67 | unsigned int is_signed; | |
9ab4d072 SS |
68 | size_t playback_ptr; |
69 | size_t period_ptr; | |
70 | atomic_t timer_active; | |
71 | int thalf; | |
72 | u64 ns_rem; | |
73 | unsigned char val61; | |
74 | int enable; | |
75 | int max_treble; | |
76 | int treble; | |
77 | int pcspkr; | |
78 | }; | |
79 | ||
80 | extern struct snd_pcsp pcsp_chip; | |
81 | ||
82 | extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle); | |
96c7d478 | 83 | extern void pcsp_sync_stop(struct snd_pcsp *chip); |
9ab4d072 SS |
84 | |
85 | extern int snd_pcsp_new_pcm(struct snd_pcsp *chip); | |
bcc2c6b7 | 86 | extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm); |
9ab4d072 SS |
87 | |
88 | #endif |