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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9ab4d072 SS |
2 | /* |
3 | * PC-Speaker driver for Linux | |
4 | * | |
5 | * Copyright (C) 1993-1997 Michael Beck | |
6 | * Copyright (C) 1997-2001 David Woodhouse | |
7 | * Copyright (C) 2001-2008 Stas Sergeev | |
8 | */ | |
9 | ||
10 | #ifndef __PCSP_H__ | |
11 | #define __PCSP_H__ | |
12 | ||
13 | #include <linux/hrtimer.h> | |
334955ef | 14 | #include <linux/i8253.h> |
8e1b5adf | 15 | #include <linux/timex.h> |
9ab4d072 SS |
16 | |
17 | #define PCSP_SOUND_VERSION 0x400 /* read 4.00 */ | |
18 | #define PCSP_DEBUG 0 | |
19 | ||
20 | /* default timer freq for PC-Speaker: 18643 Hz */ | |
21 | #define DIV_18KHZ 64 | |
22 | #define MAX_DIV DIV_18KHZ | |
97e08f5d SS |
23 | #define CALC_DIV(d) (MAX_DIV >> (d)) |
24 | #define CUR_DIV() CALC_DIV(chip->treble) | |
9ab4d072 SS |
25 | #define PCSP_MAX_TREBLE 1 |
26 | ||
27 | /* unfortunately, with hrtimers 37KHz does not work very well :( */ | |
28 | #define PCSP_DEFAULT_TREBLE 0 | |
29 | #define MIN_DIV (MAX_DIV >> PCSP_MAX_TREBLE) | |
30 | ||
31 | /* wild guess */ | |
32 | #define PCSP_MIN_LPJ 1000000 | |
33 | #define PCSP_DEFAULT_SDIV (DIV_18KHZ >> 1) | |
34 | #define PCSP_DEFAULT_SRATE (PIT_TICK_RATE / PCSP_DEFAULT_SDIV) | |
35 | #define PCSP_INDEX_INC() (1 << (PCSP_MAX_TREBLE - chip->treble)) | |
97e08f5d SS |
36 | #define PCSP_CALC_RATE(i) (PIT_TICK_RATE / CALC_DIV(i)) |
37 | #define PCSP_RATE() PCSP_CALC_RATE(chip->treble) | |
9ab4d072 SS |
38 | #define PCSP_MIN_RATE__1 MAX_DIV/PIT_TICK_RATE |
39 | #define PCSP_MAX_RATE__1 MIN_DIV/PIT_TICK_RATE | |
40 | #define PCSP_MAX_PERIOD_NS (1000000000ULL * PCSP_MIN_RATE__1) | |
41 | #define PCSP_MIN_PERIOD_NS (1000000000ULL * PCSP_MAX_RATE__1) | |
42 | #define PCSP_CALC_NS(div) ({ \ | |
43 | u64 __val = 1000000000ULL * (div); \ | |
44 | do_div(__val, PIT_TICK_RATE); \ | |
45 | __val; \ | |
46 | }) | |
47 | #define PCSP_PERIOD_NS() PCSP_CALC_NS(CUR_DIV()) | |
48 | ||
49 | #define PCSP_MAX_PERIOD_SIZE (64*1024) | |
50 | #define PCSP_MAX_PERIODS 512 | |
51 | #define PCSP_BUFFER_SIZE (128*1024) | |
52 | ||
53 | struct snd_pcsp { | |
54 | struct snd_card *card; | |
55 | struct snd_pcm *pcm; | |
56 | struct input_dev *input_dev; | |
57 | struct hrtimer timer; | |
58 | unsigned short port, irq, dma; | |
59 | spinlock_t substream_lock; | |
60 | struct snd_pcm_substream *playback_substream; | |
eea0579f TI |
61 | unsigned int fmt_size; |
62 | unsigned int is_signed; | |
9ab4d072 SS |
63 | size_t playback_ptr; |
64 | size_t period_ptr; | |
65 | atomic_t timer_active; | |
66 | int thalf; | |
67 | u64 ns_rem; | |
68 | unsigned char val61; | |
69 | int enable; | |
70 | int max_treble; | |
71 | int treble; | |
72 | int pcspkr; | |
73 | }; | |
74 | ||
75 | extern struct snd_pcsp pcsp_chip; | |
76 | ||
77 | extern enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle); | |
96c7d478 | 78 | extern void pcsp_sync_stop(struct snd_pcsp *chip); |
9ab4d072 SS |
79 | |
80 | extern int snd_pcsp_new_pcm(struct snd_pcsp *chip); | |
bcc2c6b7 | 81 | extern int snd_pcsp_new_mixer(struct snd_pcsp *chip, int nopcm); |
9ab4d072 SS |
82 | |
83 | #endif |